Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

11 files changed, 11537 insertions, 0 deletions

diff --git a/drivers/media/dvb-core/Kconfig b/drivers/media/dvb-core/Kconfig
new file mode 100644
index 000000000..f004aea35
--- /dev/null
+++ b/drivers/media/dvb-core/Kconfig
@@ -0,0 +1,55 @@
+#
+# DVB device configuration
+#
+
+config DVB_MAX_ADAPTERS
+	int "maximum number of DVB/ATSC adapters"
+	depends on DVB_CORE
+	default 16
+	range 1 255
+	help
+	  Maximum number of DVB/ATSC adapters. Increasing this number
+	  increases the memory consumption of the DVB subsystem even
+	  if a much lower number of DVB/ATSC adapters is present.
+	  Only values in the range 4-32 are tested.
+
+	  If you are unsure about this, use the default value 16
+
+config DVB_DYNAMIC_MINORS
+	bool "Dynamic DVB minor allocation"
+	depends on DVB_CORE
+	default n
+	help
+	  If you say Y here, the DVB subsystem will use dynamic minor
+	  allocation for any device that uses the DVB major number.
+	  This means that you can have more than 4 of a single type
+	  of device (like demuxes and frontends) per adapter, but udev
+	  will be required to manage the device nodes.
+
+	  If you are unsure about this, say N here.
+
+config DVB_DEMUX_SECTION_LOSS_LOG
+	bool "Enable DVB demux section packet loss log"
+	depends on DVB_CORE
+	default n
+	help
+	  Enable extra log messages meant to detect packet loss
+	  inside the Kernel.
+
+	  Should not be enabled on normal cases, as logs can
+	  be very verbose.
+
+	  If you are unsure about this, say N here.
+
+config DVB_ULE_DEBUG
+	bool "Enable DVB net ULE packet debug messages"
+	depends on DVB_CORE
+	default n
+	help
+	  Enable extra log messages meant to detect problems while
+	  handling DVB network ULE packet loss inside the Kernel.
+
+	  Should not be enabled on normal cases, as logs can
+	  be very verbose.
+
+	  If you are unsure about this, say N here.
diff --git a/drivers/media/dvb-core/Makefile b/drivers/media/dvb-core/Makefile
new file mode 100644
index 000000000..62b028ded
--- /dev/null
+++ b/drivers/media/dvb-core/Makefile
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the kernel DVB device drivers.
+#
+
+dvb-net-$(CONFIG_DVB_NET) := dvb_net.o
+dvb-vb2-$(CONFIG_DVB_MMAP) := dvb_vb2.o
+
+dvb-core-objs := dvbdev.o dmxdev.o dvb_demux.o			\
+		 dvb_ca_en50221.o dvb_frontend.o		\
+		 $(dvb-net-y) dvb_ringbuffer.o $(dvb-vb2-y) dvb_math.o
+
+obj-$(CONFIG_DVB_CORE) += dvb-core.o
diff --git a/drivers/media/dvb-core/dmxdev.c b/drivers/media/dvb-core/dmxdev.c
new file mode 100644
index 000000000..9e0ef3934
--- /dev/null
+++ b/drivers/media/dvb-core/dmxdev.c
@@ -0,0 +1,1478 @@
+/*
+ * dmxdev.c - DVB demultiplexer device
+ *
+ * Copyright (C) 2000 Ralph Metzler & Marcus Metzler
+ *		      for convergence integrated media GmbH
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#define pr_fmt(fmt) "dmxdev: " fmt
+
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/ioctl.h>
+#include <linux/wait.h>
+#include <linux/uaccess.h>
+#include <media/dmxdev.h>
+#include <media/dvb_vb2.h>
+
+static int debug;
+
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
+
+#define dprintk(fmt, arg...) do {					\
+	if (debug)							\
+		printk(KERN_DEBUG pr_fmt("%s: " fmt),			\
+			__func__, ##arg);				\
+} while (0)
+
+static int dvb_dmxdev_buffer_write(struct dvb_ringbuffer *buf,
+				   const u8 *src, size_t len)
+{
+	ssize_t free;
+
+	if (!len)
+		return 0;
+	if (!buf->data)
+		return 0;
+
+	free = dvb_ringbuffer_free(buf);
+	if (len > free) {
+		dprintk("buffer overflow\n");
+		return -EOVERFLOW;
+	}
+
+	return dvb_ringbuffer_write(buf, src, len);
+}
+
+static ssize_t dvb_dmxdev_buffer_read(struct dvb_ringbuffer *src,
+				      int non_blocking, char __user *buf,
+				      size_t count, loff_t *ppos)
+{
+	size_t todo;
+	ssize_t avail;
+	ssize_t ret = 0;
+
+	if (!src->data)
+		return 0;
+
+	if (src->error) {
+		ret = src->error;
+		dvb_ringbuffer_flush(src);
+		return ret;
+	}
+
+	for (todo = count; todo > 0; todo -= ret) {
+		if (non_blocking && dvb_ringbuffer_empty(src)) {
+			ret = -EWOULDBLOCK;
+			break;
+		}
+
+		ret = wait_event_interruptible(src->queue,
+					       !dvb_ringbuffer_empty(src) ||
+					       (src->error != 0));
+		if (ret < 0)
+			break;
+
+		if (src->error) {
+			ret = src->error;
+			dvb_ringbuffer_flush(src);
+			break;
+		}
+
+		avail = dvb_ringbuffer_avail(src);
+		if (avail > todo)
+			avail = todo;
+
+		ret = dvb_ringbuffer_read_user(src, buf, avail);
+		if (ret < 0)
+			break;
+
+		buf += ret;
+	}
+
+	return (count - todo) ? (count - todo) : ret;
+}
+
+static struct dmx_frontend *get_fe(struct dmx_demux *demux, int type)
+{
+	struct list_head *head, *pos;
+
+	head = demux->get_frontends(demux);
+	if (!head)
+		return NULL;
+	list_for_each(pos, head)
+		if (DMX_FE_ENTRY(pos)->source == type)
+			return DMX_FE_ENTRY(pos);
+
+	return NULL;
+}
+
+static int dvb_dvr_open(struct inode *inode, struct file *file)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dmxdev *dmxdev = dvbdev->priv;
+	struct dmx_frontend *front;
+	bool need_ringbuffer = false;
+
+	dprintk("%s\n", __func__);
+
+	if (mutex_lock_interruptible(&dmxdev->mutex))
+		return -ERESTARTSYS;
+
+	if (dmxdev->exit) {
+		mutex_unlock(&dmxdev->mutex);
+		return -ENODEV;
+	}
+
+	dmxdev->may_do_mmap = 0;
+
+	/*
+	 * The logic here is a little tricky due to the ifdef.
+	 *
+	 * The ringbuffer is used for both read and mmap.
+	 *
+	 * It is not needed, however, on two situations:
+	 *	- Write devices (access with O_WRONLY);
+	 *	- For duplex device nodes, opened with O_RDWR.
+	 */
+
+	if ((file->f_flags & O_ACCMODE) == O_RDONLY)
+		need_ringbuffer = true;
+	else if ((file->f_flags & O_ACCMODE) == O_RDWR) {
+		if (!(dmxdev->capabilities & DMXDEV_CAP_DUPLEX)) {
+#ifdef CONFIG_DVB_MMAP
+			dmxdev->may_do_mmap = 1;
+			need_ringbuffer = true;
+#else
+			mutex_unlock(&dmxdev->mutex);
+			return -EOPNOTSUPP;
+#endif
+		}
+	}
+
+	if (need_ringbuffer) {
+		void *mem;
+
+		if (!dvbdev->readers) {
+			mutex_unlock(&dmxdev->mutex);
+			return -EBUSY;
+		}
+		mem = vmalloc(DVR_BUFFER_SIZE);
+		if (!mem) {
+			mutex_unlock(&dmxdev->mutex);
+			return -ENOMEM;
+		}
+		dvb_ringbuffer_init(&dmxdev->dvr_buffer, mem, DVR_BUFFER_SIZE);
+		if (dmxdev->may_do_mmap)
+			dvb_vb2_init(&dmxdev->dvr_vb2_ctx, "dvr",
+				     file->f_flags & O_NONBLOCK);
+		dvbdev->readers--;
+	}
+
+	if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
+		dmxdev->dvr_orig_fe = dmxdev->demux->frontend;
+
+		if (!dmxdev->demux->write) {
+			mutex_unlock(&dmxdev->mutex);
+			return -EOPNOTSUPP;
+		}
+
+		front = get_fe(dmxdev->demux, DMX_MEMORY_FE);
+
+		if (!front) {
+			mutex_unlock(&dmxdev->mutex);
+			return -EINVAL;
+		}
+		dmxdev->demux->disconnect_frontend(dmxdev->demux);
+		dmxdev->demux->connect_frontend(dmxdev->demux, front);
+	}
+	dvbdev->users++;
+	mutex_unlock(&dmxdev->mutex);
+	return 0;
+}
+
+static int dvb_dvr_release(struct inode *inode, struct file *file)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dmxdev *dmxdev = dvbdev->priv;
+
+	mutex_lock(&dmxdev->mutex);
+
+	if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
+		dmxdev->demux->disconnect_frontend(dmxdev->demux);
+		dmxdev->demux->connect_frontend(dmxdev->demux,
+						dmxdev->dvr_orig_fe);
+	}
+
+	if (((file->f_flags & O_ACCMODE) == O_RDONLY) ||
+	    dmxdev->may_do_mmap) {
+		if (dmxdev->may_do_mmap) {
+			if (dvb_vb2_is_streaming(&dmxdev->dvr_vb2_ctx))
+				dvb_vb2_stream_off(&dmxdev->dvr_vb2_ctx);
+			dvb_vb2_release(&dmxdev->dvr_vb2_ctx);
+		}
+		dvbdev->readers++;
+		if (dmxdev->dvr_buffer.data) {
+			void *mem = dmxdev->dvr_buffer.data;
+			/*memory barrier*/
+			mb();
+			spin_lock_irq(&dmxdev->lock);
+			dmxdev->dvr_buffer.data = NULL;
+			spin_unlock_irq(&dmxdev->lock);
+			vfree(mem);
+		}
+	}
+	/* TODO */
+	dvbdev->users--;
+	if (dvbdev->users == 1 && dmxdev->exit == 1) {
+		mutex_unlock(&dmxdev->mutex);
+		wake_up(&dvbdev->wait_queue);
+	} else
+		mutex_unlock(&dmxdev->mutex);
+
+	return 0;
+}
+
+static ssize_t dvb_dvr_write(struct file *file, const char __user *buf,
+			     size_t count, loff_t *ppos)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dmxdev *dmxdev = dvbdev->priv;
+	int ret;
+
+	if (!dmxdev->demux->write)
+		return -EOPNOTSUPP;
+	if ((file->f_flags & O_ACCMODE) != O_WRONLY)
+		return -EINVAL;
+	if (mutex_lock_interruptible(&dmxdev->mutex))
+		return -ERESTARTSYS;
+
+	if (dmxdev->exit) {
+		mutex_unlock(&dmxdev->mutex);
+		return -ENODEV;
+	}
+	ret = dmxdev->demux->write(dmxdev->demux, buf, count);
+	mutex_unlock(&dmxdev->mutex);
+	return ret;
+}
+
+static ssize_t dvb_dvr_read(struct file *file, char __user *buf, size_t count,
+			    loff_t *ppos)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dmxdev *dmxdev = dvbdev->priv;
+
+	if (dmxdev->exit)
+		return -ENODEV;
+
+	return dvb_dmxdev_buffer_read(&dmxdev->dvr_buffer,
+				      file->f_flags & O_NONBLOCK,
+				      buf, count, ppos);
+}
+
+static int dvb_dvr_set_buffer_size(struct dmxdev *dmxdev,
+				      unsigned long size)
+{
+	struct dvb_ringbuffer *buf = &dmxdev->dvr_buffer;
+	void *newmem;
+	void *oldmem;
+
+	dprintk("%s\n", __func__);
+
+	if (buf->size == size)
+		return 0;
+	if (!size)
+		return -EINVAL;
+
+	newmem = vmalloc(size);
+	if (!newmem)
+		return -ENOMEM;
+
+	oldmem = buf->data;
+
+	spin_lock_irq(&dmxdev->lock);
+	buf->data = newmem;
+	buf->size = size;
+
+	/* reset and not flush in case the buffer shrinks */
+	dvb_ringbuffer_reset(buf);
+	spin_unlock_irq(&dmxdev->lock);
+
+	vfree(oldmem);
+
+	return 0;
+}
+
+static inline void dvb_dmxdev_filter_state_set(struct dmxdev_filter
+					       *dmxdevfilter, int state)
+{
+	spin_lock_irq(&dmxdevfilter->dev->lock);
+	dmxdevfilter->state = state;
+	spin_unlock_irq(&dmxdevfilter->dev->lock);
+}
+
+static int dvb_dmxdev_set_buffer_size(struct dmxdev_filter *dmxdevfilter,
+				      unsigned long size)
+{
+	struct dvb_ringbuffer *buf = &dmxdevfilter->buffer;
+	void *newmem;
+	void *oldmem;
+
+	if (buf->size == size)
+		return 0;
+	if (!size)
+		return -EINVAL;
+	if (dmxdevfilter->state >= DMXDEV_STATE_GO)
+		return -EBUSY;
+
+	newmem = vmalloc(size);
+	if (!newmem)
+		return -ENOMEM;
+
+	oldmem = buf->data;
+
+	spin_lock_irq(&dmxdevfilter->dev->lock);
+	buf->data = newmem;
+	buf->size = size;
+
+	/* reset and not flush in case the buffer shrinks */
+	dvb_ringbuffer_reset(buf);
+	spin_unlock_irq(&dmxdevfilter->dev->lock);
+
+	vfree(oldmem);
+
+	return 0;
+}
+
+static void dvb_dmxdev_filter_timeout(struct timer_list *t)
+{
+	struct dmxdev_filter *dmxdevfilter = from_timer(dmxdevfilter, t, timer);
+
+	dmxdevfilter->buffer.error = -ETIMEDOUT;
+	spin_lock_irq(&dmxdevfilter->dev->lock);
+	dmxdevfilter->state = DMXDEV_STATE_TIMEDOUT;
+	spin_unlock_irq(&dmxdevfilter->dev->lock);
+	wake_up(&dmxdevfilter->buffer.queue);
+}
+
+static void dvb_dmxdev_filter_timer(struct dmxdev_filter *dmxdevfilter)
+{
+	struct dmx_sct_filter_params *para = &dmxdevfilter->params.sec;
+
+	del_timer(&dmxdevfilter->timer);
+	if (para->timeout) {
+		dmxdevfilter->timer.expires =
+		    jiffies + 1 + (HZ / 2 + HZ * para->timeout) / 1000;
+		add_timer(&dmxdevfilter->timer);
+	}
+}
+
+static int dvb_dmxdev_section_callback(const u8 *buffer1, size_t buffer1_len,
+				       const u8 *buffer2, size_t buffer2_len,
+				       struct dmx_section_filter *filter,
+				       u32 *buffer_flags)
+{
+	struct dmxdev_filter *dmxdevfilter = filter->priv;
+	int ret;
+
+	if (!dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx) &&
+	    dmxdevfilter->buffer.error) {
+		wake_up(&dmxdevfilter->buffer.queue);
+		return 0;
+	}
+	spin_lock(&dmxdevfilter->dev->lock);
+	if (dmxdevfilter->state != DMXDEV_STATE_GO) {
+		spin_unlock(&dmxdevfilter->dev->lock);
+		return 0;
+	}
+	del_timer(&dmxdevfilter->timer);
+	dprintk("section callback %*ph\n", 6, buffer1);
+	if (dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx)) {
+		ret = dvb_vb2_fill_buffer(&dmxdevfilter->vb2_ctx,
+					  buffer1, buffer1_len,
+					  buffer_flags);
+		if (ret == buffer1_len)
+			ret = dvb_vb2_fill_buffer(&dmxdevfilter->vb2_ctx,
+						  buffer2, buffer2_len,
+						  buffer_flags);
+	} else {
+		ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer,
+					      buffer1, buffer1_len);
+		if (ret == buffer1_len) {
+			ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer,
+						      buffer2, buffer2_len);
+		}
+	}
+	if (ret < 0)
+		dmxdevfilter->buffer.error = ret;
+	if (dmxdevfilter->params.sec.flags & DMX_ONESHOT)
+		dmxdevfilter->state = DMXDEV_STATE_DONE;
+	spin_unlock(&dmxdevfilter->dev->lock);
+	wake_up(&dmxdevfilter->buffer.queue);
+	return 0;
+}
+
+static int dvb_dmxdev_ts_callback(const u8 *buffer1, size_t buffer1_len,
+				  const u8 *buffer2, size_t buffer2_len,
+				  struct dmx_ts_feed *feed,
+				  u32 *buffer_flags)
+{
+	struct dmxdev_filter *dmxdevfilter = feed->priv;
+	struct dvb_ringbuffer *buffer;
+#ifdef CONFIG_DVB_MMAP
+	struct dvb_vb2_ctx *ctx;
+#endif
+	int ret;
+
+	spin_lock(&dmxdevfilter->dev->lock);
+	if (dmxdevfilter->params.pes.output == DMX_OUT_DECODER) {
+		spin_unlock(&dmxdevfilter->dev->lock);
+		return 0;
+	}
+
+	if (dmxdevfilter->params.pes.output == DMX_OUT_TAP ||
+	    dmxdevfilter->params.pes.output == DMX_OUT_TSDEMUX_TAP) {
+		buffer = &dmxdevfilter->buffer;
+#ifdef CONFIG_DVB_MMAP
+		ctx = &dmxdevfilter->vb2_ctx;
+#endif
+	} else {
+		buffer = &dmxdevfilter->dev->dvr_buffer;
+#ifdef CONFIG_DVB_MMAP
+		ctx = &dmxdevfilter->dev->dvr_vb2_ctx;
+#endif
+	}
+
+	if (dvb_vb2_is_streaming(ctx)) {
+		ret = dvb_vb2_fill_buffer(ctx, buffer1, buffer1_len,
+					  buffer_flags);
+		if (ret == buffer1_len)
+			ret = dvb_vb2_fill_buffer(ctx, buffer2, buffer2_len,
+						  buffer_flags);
+	} else {
+		if (buffer->error) {
+			spin_unlock(&dmxdevfilter->dev->lock);
+			wake_up(&buffer->queue);
+			return 0;
+		}
+		ret = dvb_dmxdev_buffer_write(buffer, buffer1, buffer1_len);
+		if (ret == buffer1_len)
+			ret = dvb_dmxdev_buffer_write(buffer,
+						      buffer2, buffer2_len);
+	}
+	if (ret < 0)
+		buffer->error = ret;
+	spin_unlock(&dmxdevfilter->dev->lock);
+	wake_up(&buffer->queue);
+	return 0;
+}
+
+/* stop feed but only mark the specified filter as stopped (state set) */
+static int dvb_dmxdev_feed_stop(struct dmxdev_filter *dmxdevfilter)
+{
+	struct dmxdev_feed *feed;
+
+	dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
+
+	switch (dmxdevfilter->type) {
+	case DMXDEV_TYPE_SEC:
+		del_timer(&dmxdevfilter->timer);
+		dmxdevfilter->feed.sec->stop_filtering(dmxdevfilter->feed.sec);
+		break;
+	case DMXDEV_TYPE_PES:
+		list_for_each_entry(feed, &dmxdevfilter->feed.ts, next)
+			feed->ts->stop_filtering(feed->ts);
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/* start feed associated with the specified filter */
+static int dvb_dmxdev_feed_start(struct dmxdev_filter *filter)
+{
+	struct dmxdev_feed *feed;
+	int ret;
+
+	dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
+
+	switch (filter->type) {
+	case DMXDEV_TYPE_SEC:
+		return filter->feed.sec->start_filtering(filter->feed.sec);
+	case DMXDEV_TYPE_PES:
+		list_for_each_entry(feed, &filter->feed.ts, next) {
+			ret = feed->ts->start_filtering(feed->ts);
+			if (ret < 0) {
+				dvb_dmxdev_feed_stop(filter);
+				return ret;
+			}
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* restart section feed if it has filters left associated with it,
+   otherwise release the feed */
+static int dvb_dmxdev_feed_restart(struct dmxdev_filter *filter)
+{
+	int i;
+	struct dmxdev *dmxdev = filter->dev;
+	u16 pid = filter->params.sec.pid;
+
+	for (i = 0; i < dmxdev->filternum; i++)
+		if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
+		    dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
+		    dmxdev->filter[i].params.sec.pid == pid) {
+			dvb_dmxdev_feed_start(&dmxdev->filter[i]);
+			return 0;
+		}
+
+	filter->dev->demux->release_section_feed(dmxdev->demux,
+						 filter->feed.sec);
+
+	return 0;
+}
+
+static int dvb_dmxdev_filter_stop(struct dmxdev_filter *dmxdevfilter)
+{
+	struct dmxdev_feed *feed;
+	struct dmx_demux *demux;
+
+	if (dmxdevfilter->state < DMXDEV_STATE_GO)
+		return 0;
+
+	switch (dmxdevfilter->type) {
+	case DMXDEV_TYPE_SEC:
+		if (!dmxdevfilter->feed.sec)
+			break;
+		dvb_dmxdev_feed_stop(dmxdevfilter);
+		if (dmxdevfilter->filter.sec)
+			dmxdevfilter->feed.sec->
+			    release_filter(dmxdevfilter->feed.sec,
+					   dmxdevfilter->filter.sec);
+		dvb_dmxdev_feed_restart(dmxdevfilter);
+		dmxdevfilter->feed.sec = NULL;
+		break;
+	case DMXDEV_TYPE_PES:
+		dvb_dmxdev_feed_stop(dmxdevfilter);
+		demux = dmxdevfilter->dev->demux;
+		list_for_each_entry(feed, &dmxdevfilter->feed.ts, next) {
+			demux->release_ts_feed(demux, feed->ts);
+			feed->ts = NULL;
+		}
+		break;
+	default:
+		if (dmxdevfilter->state == DMXDEV_STATE_ALLOCATED)
+			return 0;
+		return -EINVAL;
+	}
+
+	dvb_ringbuffer_flush(&dmxdevfilter->buffer);
+	return 0;
+}
+
+static void dvb_dmxdev_delete_pids(struct dmxdev_filter *dmxdevfilter)
+{
+	struct dmxdev_feed *feed, *tmp;
+
+	/* delete all PIDs */
+	list_for_each_entry_safe(feed, tmp, &dmxdevfilter->feed.ts, next) {
+		list_del(&feed->next);
+		kfree(feed);
+	}
+
+	BUG_ON(!list_empty(&dmxdevfilter->feed.ts));
+}
+
+static inline int dvb_dmxdev_filter_reset(struct dmxdev_filter *dmxdevfilter)
+{
+	if (dmxdevfilter->state < DMXDEV_STATE_SET)
+		return 0;
+
+	if (dmxdevfilter->type == DMXDEV_TYPE_PES)
+		dvb_dmxdev_delete_pids(dmxdevfilter);
+
+	dmxdevfilter->type = DMXDEV_TYPE_NONE;
+	dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
+	return 0;
+}
+
+static int dvb_dmxdev_start_feed(struct dmxdev *dmxdev,
+				 struct dmxdev_filter *filter,
+				 struct dmxdev_feed *feed)
+{
+	ktime_t timeout = ktime_set(0, 0);
+	struct dmx_pes_filter_params *para = &filter->params.pes;
+	enum dmx_output otype;
+	int ret;
+	int ts_type;
+	enum dmx_ts_pes ts_pes;
+	struct dmx_ts_feed *tsfeed;
+
+	feed->ts = NULL;
+	otype = para->output;
+
+	ts_pes = para->pes_type;
+
+	if (ts_pes < DMX_PES_OTHER)
+		ts_type = TS_DECODER;
+	else
+		ts_type = 0;
+
+	if (otype == DMX_OUT_TS_TAP)
+		ts_type |= TS_PACKET;
+	else if (otype == DMX_OUT_TSDEMUX_TAP)
+		ts_type |= TS_PACKET | TS_DEMUX;
+	else if (otype == DMX_OUT_TAP)
+		ts_type |= TS_PACKET | TS_DEMUX | TS_PAYLOAD_ONLY;
+
+	ret = dmxdev->demux->allocate_ts_feed(dmxdev->demux, &feed->ts,
+					      dvb_dmxdev_ts_callback);
+	if (ret < 0)
+		return ret;
+
+	tsfeed = feed->ts;
+	tsfeed->priv = filter;
+
+	ret = tsfeed->set(tsfeed, feed->pid, ts_type, ts_pes, timeout);
+	if (ret < 0) {
+		dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
+		return ret;
+	}
+
+	ret = tsfeed->start_filtering(tsfeed);
+	if (ret < 0) {
+		dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int dvb_dmxdev_filter_start(struct dmxdev_filter *filter)
+{
+	struct dmxdev *dmxdev = filter->dev;
+	struct dmxdev_feed *feed;
+	void *mem;
+	int ret, i;
+
+	if (filter->state < DMXDEV_STATE_SET)
+		return -EINVAL;
+
+	if (filter->state >= DMXDEV_STATE_GO)
+		dvb_dmxdev_filter_stop(filter);
+
+	if (!filter->buffer.data) {
+		mem = vmalloc(filter->buffer.size);
+		if (!mem)
+			return -ENOMEM;
+		spin_lock_irq(&filter->dev->lock);
+		filter->buffer.data = mem;
+		spin_unlock_irq(&filter->dev->lock);
+	}
+
+	dvb_ringbuffer_flush(&filter->buffer);
+
+	switch (filter->type) {
+	case DMXDEV_TYPE_SEC:
+	{
+		struct dmx_sct_filter_params *para = &filter->params.sec;
+		struct dmx_section_filter **secfilter = &filter->filter.sec;
+		struct dmx_section_feed **secfeed = &filter->feed.sec;
+
+		*secfilter = NULL;
+		*secfeed = NULL;
+
+
+		/* find active filter/feed with same PID */
+		for (i = 0; i < dmxdev->filternum; i++) {
+			if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
+			    dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
+			    dmxdev->filter[i].params.sec.pid == para->pid) {
+				*secfeed = dmxdev->filter[i].feed.sec;
+				break;
+			}
+		}
+
+		/* if no feed found, try to allocate new one */
+		if (!*secfeed) {
+			ret = dmxdev->demux->allocate_section_feed(dmxdev->demux,
+								   secfeed,
+								   dvb_dmxdev_section_callback);
+			if (ret < 0) {
+				pr_err("DVB (%s): could not alloc feed\n",
+				       __func__);
+				return ret;
+			}
+
+			ret = (*secfeed)->set(*secfeed, para->pid,
+					      (para->flags & DMX_CHECK_CRC) ? 1 : 0);
+			if (ret < 0) {
+				pr_err("DVB (%s): could not set feed\n",
+				       __func__);
+				dvb_dmxdev_feed_restart(filter);
+				return ret;
+			}
+		} else {
+			dvb_dmxdev_feed_stop(filter);
+		}
+
+		ret = (*secfeed)->allocate_filter(*secfeed, secfilter);
+		if (ret < 0) {
+			dvb_dmxdev_feed_restart(filter);
+			filter->feed.sec->start_filtering(*secfeed);
+			dprintk("could not get filter\n");
+			return ret;
+		}
+
+		(*secfilter)->priv = filter;
+
+		memcpy(&((*secfilter)->filter_value[3]),
+		       &(para->filter.filter[1]), DMX_FILTER_SIZE - 1);
+		memcpy(&(*secfilter)->filter_mask[3],
+		       &para->filter.mask[1], DMX_FILTER_SIZE - 1);
+		memcpy(&(*secfilter)->filter_mode[3],
+		       &para->filter.mode[1], DMX_FILTER_SIZE - 1);
+
+		(*secfilter)->filter_value[0] = para->filter.filter[0];
+		(*secfilter)->filter_mask[0] = para->filter.mask[0];
+		(*secfilter)->filter_mode[0] = para->filter.mode[0];
+		(*secfilter)->filter_mask[1] = 0;
+		(*secfilter)->filter_mask[2] = 0;
+
+		filter->todo = 0;
+
+		ret = filter->feed.sec->start_filtering(filter->feed.sec);
+		if (ret < 0)
+			return ret;
+
+		dvb_dmxdev_filter_timer(filter);
+		break;
+	}
+	case DMXDEV_TYPE_PES:
+		list_for_each_entry(feed, &filter->feed.ts, next) {
+			ret = dvb_dmxdev_start_feed(dmxdev, filter, feed);
+			if (ret < 0) {
+				dvb_dmxdev_filter_stop(filter);
+				return ret;
+			}
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
+	return 0;
+}
+
+static int dvb_demux_open(struct inode *inode, struct file *file)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dmxdev *dmxdev = dvbdev->priv;
+	int i;
+	struct dmxdev_filter *dmxdevfilter;
+
+	if (!dmxdev->filter)
+		return -EINVAL;
+
+	if (mutex_lock_interruptible(&dmxdev->mutex))
+		return -ERESTARTSYS;
+
+	for (i = 0; i < dmxdev->filternum; i++)
+		if (dmxdev->filter[i].state == DMXDEV_STATE_FREE)
+			break;
+
+	if (i == dmxdev->filternum) {
+		mutex_unlock(&dmxdev->mutex);
+		return -EMFILE;
+	}
+
+	dmxdevfilter = &dmxdev->filter[i];
+	mutex_init(&dmxdevfilter->mutex);
+	file->private_data = dmxdevfilter;
+
+#ifdef CONFIG_DVB_MMAP
+	dmxdev->may_do_mmap = 1;
+#else
+	dmxdev->may_do_mmap = 0;
+#endif
+
+	dvb_ringbuffer_init(&dmxdevfilter->buffer, NULL, 8192);
+	dvb_vb2_init(&dmxdevfilter->vb2_ctx, "demux_filter",
+		     file->f_flags & O_NONBLOCK);
+	dmxdevfilter->type = DMXDEV_TYPE_NONE;
+	dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
+	timer_setup(&dmxdevfilter->timer, dvb_dmxdev_filter_timeout, 0);
+
+	dvbdev->users++;
+
+	mutex_unlock(&dmxdev->mutex);
+	return 0;
+}
+
+static int dvb_dmxdev_filter_free(struct dmxdev *dmxdev,
+				  struct dmxdev_filter *dmxdevfilter)
+{
+	mutex_lock(&dmxdev->mutex);
+	mutex_lock(&dmxdevfilter->mutex);
+	if (dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
+		dvb_vb2_stream_off(&dmxdevfilter->vb2_ctx);
+	dvb_vb2_release(&dmxdevfilter->vb2_ctx);
+
+
+	dvb_dmxdev_filter_stop(dmxdevfilter);
+	dvb_dmxdev_filter_reset(dmxdevfilter);
+
+	if (dmxdevfilter->buffer.data) {
+		void *mem = dmxdevfilter->buffer.data;
+
+		spin_lock_irq(&dmxdev->lock);
+		dmxdevfilter->buffer.data = NULL;
+		spin_unlock_irq(&dmxdev->lock);
+		vfree(mem);
+	}
+
+	dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_FREE);
+	wake_up(&dmxdevfilter->buffer.queue);
+	mutex_unlock(&dmxdevfilter->mutex);
+	mutex_unlock(&dmxdev->mutex);
+	return 0;
+}
+
+static inline void invert_mode(struct dmx_filter *filter)
+{
+	int i;
+
+	for (i = 0; i < DMX_FILTER_SIZE; i++)
+		filter->mode[i] ^= 0xff;
+}
+
+static int dvb_dmxdev_add_pid(struct dmxdev *dmxdev,
+			      struct dmxdev_filter *filter, u16 pid)
+{
+	struct dmxdev_feed *feed;
+
+	if ((filter->type != DMXDEV_TYPE_PES) ||
+	    (filter->state < DMXDEV_STATE_SET))
+		return -EINVAL;
+
+	/* only TS packet filters may have multiple PIDs */
+	if ((filter->params.pes.output != DMX_OUT_TSDEMUX_TAP) &&
+	    (!list_empty(&filter->feed.ts)))
+		return -EINVAL;
+
+	feed = kzalloc(sizeof(struct dmxdev_feed), GFP_KERNEL);
+	if (feed == NULL)
+		return -ENOMEM;
+
+	feed->pid = pid;
+	list_add(&feed->next, &filter->feed.ts);
+
+	if (filter->state >= DMXDEV_STATE_GO)
+		return dvb_dmxdev_start_feed(dmxdev, filter, feed);
+
+	return 0;
+}
+
+static int dvb_dmxdev_remove_pid(struct dmxdev *dmxdev,
+				  struct dmxdev_filter *filter, u16 pid)
+{
+	struct dmxdev_feed *feed, *tmp;
+
+	if ((filter->type != DMXDEV_TYPE_PES) ||
+	    (filter->state < DMXDEV_STATE_SET))
+		return -EINVAL;
+
+	list_for_each_entry_safe(feed, tmp, &filter->feed.ts, next) {
+		if ((feed->pid == pid) && (feed->ts != NULL)) {
+			feed->ts->stop_filtering(feed->ts);
+			filter->dev->demux->release_ts_feed(filter->dev->demux,
+							    feed->ts);
+			list_del(&feed->next);
+			kfree(feed);
+		}
+	}
+
+	return 0;
+}
+
+static int dvb_dmxdev_filter_set(struct dmxdev *dmxdev,
+				 struct dmxdev_filter *dmxdevfilter,
+				 struct dmx_sct_filter_params *params)
+{
+	dprintk("%s: PID=0x%04x, flags=%02x, timeout=%d\n",
+		__func__, params->pid, params->flags, params->timeout);
+
+	dvb_dmxdev_filter_stop(dmxdevfilter);
+
+	dmxdevfilter->type = DMXDEV_TYPE_SEC;
+	memcpy(&dmxdevfilter->params.sec,
+	       params, sizeof(struct dmx_sct_filter_params));
+	invert_mode(&dmxdevfilter->params.sec.filter);
+	dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
+
+	if (params->flags & DMX_IMMEDIATE_START)
+		return dvb_dmxdev_filter_start(dmxdevfilter);
+
+	return 0;
+}
+
+static int dvb_dmxdev_pes_filter_set(struct dmxdev *dmxdev,
+				     struct dmxdev_filter *dmxdevfilter,
+				     struct dmx_pes_filter_params *params)
+{
+	int ret;
+
+	dvb_dmxdev_filter_stop(dmxdevfilter);
+	dvb_dmxdev_filter_reset(dmxdevfilter);
+
+	if ((unsigned int)params->pes_type > DMX_PES_OTHER)
+		return -EINVAL;
+
+	dmxdevfilter->type = DMXDEV_TYPE_PES;
+	memcpy(&dmxdevfilter->params, params,
+	       sizeof(struct dmx_pes_filter_params));
+	INIT_LIST_HEAD(&dmxdevfilter->feed.ts);
+
+	dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
+
+	ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter,
+				 dmxdevfilter->params.pes.pid);
+	if (ret < 0)
+		return ret;
+
+	if (params->flags & DMX_IMMEDIATE_START)
+		return dvb_dmxdev_filter_start(dmxdevfilter);
+
+	return 0;
+}
+
+static ssize_t dvb_dmxdev_read_sec(struct dmxdev_filter *dfil,
+				   struct file *file, char __user *buf,
+				   size_t count, loff_t *ppos)
+{
+	int result, hcount;
+	int done = 0;
+
+	if (dfil->todo <= 0) {
+		hcount = 3 + dfil->todo;
+		if (hcount > count)
+			hcount = count;
+		result = dvb_dmxdev_buffer_read(&dfil->buffer,
+						file->f_flags & O_NONBLOCK,
+						buf, hcount, ppos);
+		if (result < 0) {
+			dfil->todo = 0;
+			return result;
+		}
+		if (copy_from_user(dfil->secheader - dfil->todo, buf, result))
+			return -EFAULT;
+		buf += result;
+		done = result;
+		count -= result;
+		dfil->todo -= result;
+		if (dfil->todo > -3)
+			return done;
+		dfil->todo = ((dfil->secheader[1] << 8) | dfil->secheader[2]) & 0xfff;
+		if (!count)
+			return done;
+	}
+	if (count > dfil->todo)
+		count = dfil->todo;
+	result = dvb_dmxdev_buffer_read(&dfil->buffer,
+					file->f_flags & O_NONBLOCK,
+					buf, count, ppos);
+	if (result < 0)
+		return result;
+	dfil->todo -= result;
+	return (result + done);
+}
+
+static ssize_t
+dvb_demux_read(struct file *file, char __user *buf, size_t count,
+	       loff_t *ppos)
+{
+	struct dmxdev_filter *dmxdevfilter = file->private_data;
+	int ret;
+
+	if (mutex_lock_interruptible(&dmxdevfilter->mutex))
+		return -ERESTARTSYS;
+
+	if (dmxdevfilter->type == DMXDEV_TYPE_SEC)
+		ret = dvb_dmxdev_read_sec(dmxdevfilter, file, buf, count, ppos);
+	else
+		ret = dvb_dmxdev_buffer_read(&dmxdevfilter->buffer,
+					     file->f_flags & O_NONBLOCK,
+					     buf, count, ppos);
+
+	mutex_unlock(&dmxdevfilter->mutex);
+	return ret;
+}
+
+static int dvb_demux_do_ioctl(struct file *file,
+			      unsigned int cmd, void *parg)
+{
+	struct dmxdev_filter *dmxdevfilter = file->private_data;
+	struct dmxdev *dmxdev = dmxdevfilter->dev;
+	unsigned long arg = (unsigned long)parg;
+	int ret = 0;
+
+	if (mutex_lock_interruptible(&dmxdev->mutex))
+		return -ERESTARTSYS;
+
+	switch (cmd) {
+	case DMX_START:
+		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
+			mutex_unlock(&dmxdev->mutex);
+			return -ERESTARTSYS;
+		}
+		if (dmxdevfilter->state < DMXDEV_STATE_SET)
+			ret = -EINVAL;
+		else
+			ret = dvb_dmxdev_filter_start(dmxdevfilter);
+		mutex_unlock(&dmxdevfilter->mutex);
+		break;
+
+	case DMX_STOP:
+		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
+			mutex_unlock(&dmxdev->mutex);
+			return -ERESTARTSYS;
+		}
+		ret = dvb_dmxdev_filter_stop(dmxdevfilter);
+		mutex_unlock(&dmxdevfilter->mutex);
+		break;
+
+	case DMX_SET_FILTER:
+		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
+			mutex_unlock(&dmxdev->mutex);
+			return -ERESTARTSYS;
+		}
+		ret = dvb_dmxdev_filter_set(dmxdev, dmxdevfilter, parg);
+		mutex_unlock(&dmxdevfilter->mutex);
+		break;
+
+	case DMX_SET_PES_FILTER:
+		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
+			mutex_unlock(&dmxdev->mutex);
+			return -ERESTARTSYS;
+		}
+		ret = dvb_dmxdev_pes_filter_set(dmxdev, dmxdevfilter, parg);
+		mutex_unlock(&dmxdevfilter->mutex);
+		break;
+
+	case DMX_SET_BUFFER_SIZE:
+		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
+			mutex_unlock(&dmxdev->mutex);
+			return -ERESTARTSYS;
+		}
+		ret = dvb_dmxdev_set_buffer_size(dmxdevfilter, arg);
+		mutex_unlock(&dmxdevfilter->mutex);
+		break;
+
+	case DMX_GET_PES_PIDS:
+		if (!dmxdev->demux->get_pes_pids) {
+			ret = -EINVAL;
+			break;
+		}
+		dmxdev->demux->get_pes_pids(dmxdev->demux, parg);
+		break;
+
+	case DMX_GET_STC:
+		if (!dmxdev->demux->get_stc) {
+			ret = -EINVAL;
+			break;
+		}
+		ret = dmxdev->demux->get_stc(dmxdev->demux,
+					     ((struct dmx_stc *)parg)->num,
+					     &((struct dmx_stc *)parg)->stc,
+					     &((struct dmx_stc *)parg)->base);
+		break;
+
+	case DMX_ADD_PID:
+		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
+			ret = -ERESTARTSYS;
+			break;
+		}
+		ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
+		mutex_unlock(&dmxdevfilter->mutex);
+		break;
+
+	case DMX_REMOVE_PID:
+		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
+			ret = -ERESTARTSYS;
+			break;
+		}
+		ret = dvb_dmxdev_remove_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
+		mutex_unlock(&dmxdevfilter->mutex);
+		break;
+
+#ifdef CONFIG_DVB_MMAP
+	case DMX_REQBUFS:
+		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
+			mutex_unlock(&dmxdev->mutex);
+			return -ERESTARTSYS;
+		}
+		ret = dvb_vb2_reqbufs(&dmxdevfilter->vb2_ctx, parg);
+		mutex_unlock(&dmxdevfilter->mutex);
+		break;
+
+	case DMX_QUERYBUF:
+		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
+			mutex_unlock(&dmxdev->mutex);
+			return -ERESTARTSYS;
+		}
+		ret = dvb_vb2_querybuf(&dmxdevfilter->vb2_ctx, parg);
+		mutex_unlock(&dmxdevfilter->mutex);
+		break;
+
+	case DMX_EXPBUF:
+		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
+			mutex_unlock(&dmxdev->mutex);
+			return -ERESTARTSYS;
+		}
+		ret = dvb_vb2_expbuf(&dmxdevfilter->vb2_ctx, parg);
+		mutex_unlock(&dmxdevfilter->mutex);
+		break;
+
+	case DMX_QBUF:
+		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
+			mutex_unlock(&dmxdev->mutex);
+			return -ERESTARTSYS;
+		}
+		ret = dvb_vb2_qbuf(&dmxdevfilter->vb2_ctx, parg);
+		if (ret == 0 && !dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
+			ret = dvb_vb2_stream_on(&dmxdevfilter->vb2_ctx);
+		mutex_unlock(&dmxdevfilter->mutex);
+		break;
+
+	case DMX_DQBUF:
+		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
+			mutex_unlock(&dmxdev->mutex);
+			return -ERESTARTSYS;
+		}
+		ret = dvb_vb2_dqbuf(&dmxdevfilter->vb2_ctx, parg);
+		mutex_unlock(&dmxdevfilter->mutex);
+		break;
+#endif
+	default:
+		ret = -ENOTTY;
+		break;
+	}
+	mutex_unlock(&dmxdev->mutex);
+	return ret;
+}
+
+static long dvb_demux_ioctl(struct file *file, unsigned int cmd,
+			    unsigned long arg)
+{
+	return dvb_usercopy(file, cmd, arg, dvb_demux_do_ioctl);
+}
+
+static __poll_t dvb_demux_poll(struct file *file, poll_table *wait)
+{
+	struct dmxdev_filter *dmxdevfilter = file->private_data;
+	__poll_t mask = 0;
+
+	if ((!dmxdevfilter) || dmxdevfilter->dev->exit)
+		return EPOLLERR;
+	if (dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
+		return dvb_vb2_poll(&dmxdevfilter->vb2_ctx, file, wait);
+
+	poll_wait(file, &dmxdevfilter->buffer.queue, wait);
+
+	if (dmxdevfilter->state != DMXDEV_STATE_GO &&
+	    dmxdevfilter->state != DMXDEV_STATE_DONE &&
+	    dmxdevfilter->state != DMXDEV_STATE_TIMEDOUT)
+		return 0;
+
+	if (dmxdevfilter->buffer.error)
+		mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI | EPOLLERR);
+
+	if (!dvb_ringbuffer_empty(&dmxdevfilter->buffer))
+		mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
+
+	return mask;
+}
+
+#ifdef CONFIG_DVB_MMAP
+static int dvb_demux_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	struct dmxdev_filter *dmxdevfilter = file->private_data;
+	struct dmxdev *dmxdev = dmxdevfilter->dev;
+	int ret;
+
+	if (!dmxdev->may_do_mmap)
+		return -ENOTTY;
+
+	if (mutex_lock_interruptible(&dmxdev->mutex))
+		return -ERESTARTSYS;
+
+	if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
+		mutex_unlock(&dmxdev->mutex);
+		return -ERESTARTSYS;
+	}
+	ret = dvb_vb2_mmap(&dmxdevfilter->vb2_ctx, vma);
+
+	mutex_unlock(&dmxdevfilter->mutex);
+	mutex_unlock(&dmxdev->mutex);
+
+	return ret;
+}
+#endif
+
+static int dvb_demux_release(struct inode *inode, struct file *file)
+{
+	struct dmxdev_filter *dmxdevfilter = file->private_data;
+	struct dmxdev *dmxdev = dmxdevfilter->dev;
+	int ret;
+
+	ret = dvb_dmxdev_filter_free(dmxdev, dmxdevfilter);
+
+	mutex_lock(&dmxdev->mutex);
+	dmxdev->dvbdev->users--;
+	if (dmxdev->dvbdev->users == 1 && dmxdev->exit == 1) {
+		mutex_unlock(&dmxdev->mutex);
+		wake_up(&dmxdev->dvbdev->wait_queue);
+	} else
+		mutex_unlock(&dmxdev->mutex);
+
+	return ret;
+}
+
+static const struct file_operations dvb_demux_fops = {
+	.owner = THIS_MODULE,
+	.read = dvb_demux_read,
+	.unlocked_ioctl = dvb_demux_ioctl,
+	.open = dvb_demux_open,
+	.release = dvb_demux_release,
+	.poll = dvb_demux_poll,
+	.llseek = default_llseek,
+#ifdef CONFIG_DVB_MMAP
+	.mmap = dvb_demux_mmap,
+#endif
+};
+
+static const struct dvb_device dvbdev_demux = {
+	.priv = NULL,
+	.users = 1,
+	.writers = 1,
+#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
+	.name = "dvb-demux",
+#endif
+	.fops = &dvb_demux_fops
+};
+
+static int dvb_dvr_do_ioctl(struct file *file,
+			    unsigned int cmd, void *parg)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dmxdev *dmxdev = dvbdev->priv;
+	unsigned long arg = (unsigned long)parg;
+	int ret;
+
+	if (mutex_lock_interruptible(&dmxdev->mutex))
+		return -ERESTARTSYS;
+
+	switch (cmd) {
+	case DMX_SET_BUFFER_SIZE:
+		ret = dvb_dvr_set_buffer_size(dmxdev, arg);
+		break;
+
+#ifdef CONFIG_DVB_MMAP
+	case DMX_REQBUFS:
+		ret = dvb_vb2_reqbufs(&dmxdev->dvr_vb2_ctx, parg);
+		break;
+
+	case DMX_QUERYBUF:
+		ret = dvb_vb2_querybuf(&dmxdev->dvr_vb2_ctx, parg);
+		break;
+
+	case DMX_EXPBUF:
+		ret = dvb_vb2_expbuf(&dmxdev->dvr_vb2_ctx, parg);
+		break;
+
+	case DMX_QBUF:
+		ret = dvb_vb2_qbuf(&dmxdev->dvr_vb2_ctx, parg);
+		if (ret == 0 && !dvb_vb2_is_streaming(&dmxdev->dvr_vb2_ctx))
+			ret = dvb_vb2_stream_on(&dmxdev->dvr_vb2_ctx);
+		break;
+
+	case DMX_DQBUF:
+		ret = dvb_vb2_dqbuf(&dmxdev->dvr_vb2_ctx, parg);
+		break;
+#endif
+	default:
+		ret = -ENOTTY;
+		break;
+	}
+	mutex_unlock(&dmxdev->mutex);
+	return ret;
+}
+
+static long dvb_dvr_ioctl(struct file *file,
+			 unsigned int cmd, unsigned long arg)
+{
+	return dvb_usercopy(file, cmd, arg, dvb_dvr_do_ioctl);
+}
+
+static __poll_t dvb_dvr_poll(struct file *file, poll_table *wait)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dmxdev *dmxdev = dvbdev->priv;
+	__poll_t mask = 0;
+
+	dprintk("%s\n", __func__);
+
+	if (dmxdev->exit)
+		return EPOLLERR;
+	if (dvb_vb2_is_streaming(&dmxdev->dvr_vb2_ctx))
+		return dvb_vb2_poll(&dmxdev->dvr_vb2_ctx, file, wait);
+
+	poll_wait(file, &dmxdev->dvr_buffer.queue, wait);
+
+	if (((file->f_flags & O_ACCMODE) == O_RDONLY) ||
+	    dmxdev->may_do_mmap) {
+		if (dmxdev->dvr_buffer.error)
+			mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI | EPOLLERR);
+
+		if (!dvb_ringbuffer_empty(&dmxdev->dvr_buffer))
+			mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
+	} else
+		mask |= (EPOLLOUT | EPOLLWRNORM | EPOLLPRI);
+
+	return mask;
+}
+
+#ifdef CONFIG_DVB_MMAP
+static int dvb_dvr_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dmxdev *dmxdev = dvbdev->priv;
+	int ret;
+
+	if (!dmxdev->may_do_mmap)
+		return -ENOTTY;
+
+	if (dmxdev->exit)
+		return -ENODEV;
+
+	if (mutex_lock_interruptible(&dmxdev->mutex))
+		return -ERESTARTSYS;
+
+	ret = dvb_vb2_mmap(&dmxdev->dvr_vb2_ctx, vma);
+	mutex_unlock(&dmxdev->mutex);
+	return ret;
+}
+#endif
+
+static const struct file_operations dvb_dvr_fops = {
+	.owner = THIS_MODULE,
+	.read = dvb_dvr_read,
+	.write = dvb_dvr_write,
+	.unlocked_ioctl = dvb_dvr_ioctl,
+	.open = dvb_dvr_open,
+	.release = dvb_dvr_release,
+	.poll = dvb_dvr_poll,
+	.llseek = default_llseek,
+#ifdef CONFIG_DVB_MMAP
+	.mmap = dvb_dvr_mmap,
+#endif
+};
+
+static const struct dvb_device dvbdev_dvr = {
+	.priv = NULL,
+	.readers = 1,
+	.users = 1,
+#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
+	.name = "dvb-dvr",
+#endif
+	.fops = &dvb_dvr_fops
+};
+int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *dvb_adapter)
+{
+	int i, ret;
+
+	if (dmxdev->demux->open(dmxdev->demux) < 0)
+		return -EUSERS;
+
+	dmxdev->filter = vmalloc(array_size(sizeof(struct dmxdev_filter),
+					    dmxdev->filternum));
+	if (!dmxdev->filter)
+		return -ENOMEM;
+
+	mutex_init(&dmxdev->mutex);
+	spin_lock_init(&dmxdev->lock);
+	for (i = 0; i < dmxdev->filternum; i++) {
+		dmxdev->filter[i].dev = dmxdev;
+		dmxdev->filter[i].buffer.data = NULL;
+		dvb_dmxdev_filter_state_set(&dmxdev->filter[i],
+					    DMXDEV_STATE_FREE);
+	}
+
+	ret = dvb_register_device(dvb_adapter, &dmxdev->dvbdev, &dvbdev_demux, dmxdev,
+			    DVB_DEVICE_DEMUX, dmxdev->filternum);
+	if (ret < 0)
+		goto err_register_dvbdev;
+
+	ret = dvb_register_device(dvb_adapter, &dmxdev->dvr_dvbdev, &dvbdev_dvr,
+			    dmxdev, DVB_DEVICE_DVR, dmxdev->filternum);
+	if (ret < 0)
+		goto err_register_dvr_dvbdev;
+
+	dvb_ringbuffer_init(&dmxdev->dvr_buffer, NULL, 8192);
+
+	return 0;
+
+err_register_dvr_dvbdev:
+	dvb_unregister_device(dmxdev->dvbdev);
+err_register_dvbdev:
+	vfree(dmxdev->filter);
+	dmxdev->filter = NULL;
+	return ret;
+}
+
+EXPORT_SYMBOL(dvb_dmxdev_init);
+
+void dvb_dmxdev_release(struct dmxdev *dmxdev)
+{
+	dmxdev->exit = 1;
+	if (dmxdev->dvbdev->users > 1) {
+		wait_event(dmxdev->dvbdev->wait_queue,
+				dmxdev->dvbdev->users == 1);
+	}
+	if (dmxdev->dvr_dvbdev->users > 1) {
+		wait_event(dmxdev->dvr_dvbdev->wait_queue,
+				dmxdev->dvr_dvbdev->users == 1);
+	}
+
+	dvb_unregister_device(dmxdev->dvbdev);
+	dvb_unregister_device(dmxdev->dvr_dvbdev);
+
+	vfree(dmxdev->filter);
+	dmxdev->filter = NULL;
+	dmxdev->demux->close(dmxdev->demux);
+}
+
+EXPORT_SYMBOL(dvb_dmxdev_release);
diff --git a/drivers/media/dvb-core/dvb_ca_en50221.c b/drivers/media/dvb-core/dvb_ca_en50221.c
new file mode 100644
index 000000000..4d371cea0
--- /dev/null
+++ b/drivers/media/dvb-core/dvb_ca_en50221.c
@@ -0,0 +1,1955 @@
+/*
+ * dvb_ca.c: generic DVB functions for EN50221 CAM interfaces
+ *
+ * Copyright (C) 2004 Andrew de Quincey
+ *
+ * Parts of this file were based on sources as follows:
+ *
+ * Copyright (C) 2003 Ralph Metzler <rjkm@metzlerbros.de>
+ *
+ * based on code:
+ *
+ * Copyright (C) 1999-2002 Ralph  Metzler
+ *                       & Marcus Metzler for convergence integrated media GmbH
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * To obtain the license, point your browser to
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#define pr_fmt(fmt) "dvb_ca_en50221: " fmt
+
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/nospec.h>
+#include <linux/vmalloc.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/sched/signal.h>
+#include <linux/kthread.h>
+
+#include <media/dvb_ca_en50221.h>
+#include <media/dvb_ringbuffer.h>
+
+static int dvb_ca_en50221_debug;
+
+module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644);
+MODULE_PARM_DESC(cam_debug, "enable verbose debug messages");
+
+#define dprintk(fmt, arg...) do {					\
+	if (dvb_ca_en50221_debug)					\
+		printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg);\
+} while (0)
+
+#define INIT_TIMEOUT_SECS 10
+
+#define HOST_LINK_BUF_SIZE 0x200
+
+#define RX_BUFFER_SIZE 65535
+
+#define MAX_RX_PACKETS_PER_ITERATION 10
+
+#define CTRLIF_DATA      0
+#define CTRLIF_COMMAND   1
+#define CTRLIF_STATUS    1
+#define CTRLIF_SIZE_LOW  2
+#define CTRLIF_SIZE_HIGH 3
+
+#define CMDREG_HC        1	/* Host control */
+#define CMDREG_SW        2	/* Size write */
+#define CMDREG_SR        4	/* Size read */
+#define CMDREG_RS        8	/* Reset interface */
+#define CMDREG_FRIE   0x40	/* Enable FR interrupt */
+#define CMDREG_DAIE   0x80	/* Enable DA interrupt */
+#define IRQEN (CMDREG_DAIE)
+
+#define STATUSREG_RE     1	/* read error */
+#define STATUSREG_WE     2	/* write error */
+#define STATUSREG_FR  0x40	/* module free */
+#define STATUSREG_DA  0x80	/* data available */
+
+#define DVB_CA_SLOTSTATE_NONE           0
+#define DVB_CA_SLOTSTATE_UNINITIALISED  1
+#define DVB_CA_SLOTSTATE_RUNNING        2
+#define DVB_CA_SLOTSTATE_INVALID        3
+#define DVB_CA_SLOTSTATE_WAITREADY      4
+#define DVB_CA_SLOTSTATE_VALIDATE       5
+#define DVB_CA_SLOTSTATE_WAITFR         6
+#define DVB_CA_SLOTSTATE_LINKINIT       7
+
+/* Information on a CA slot */
+struct dvb_ca_slot {
+	/* current state of the CAM */
+	int slot_state;
+
+	/* mutex used for serializing access to one CI slot */
+	struct mutex slot_lock;
+
+	/* Number of CAMCHANGES that have occurred since last processing */
+	atomic_t camchange_count;
+
+	/* Type of last CAMCHANGE */
+	int camchange_type;
+
+	/* base address of CAM config */
+	u32 config_base;
+
+	/* value to write into Config Control register */
+	u8 config_option;
+
+	/* if 1, the CAM supports DA IRQs */
+	u8 da_irq_supported:1;
+
+	/* size of the buffer to use when talking to the CAM */
+	int link_buf_size;
+
+	/* buffer for incoming packets */
+	struct dvb_ringbuffer rx_buffer;
+
+	/* timer used during various states of the slot */
+	unsigned long timeout;
+};
+
+/* Private CA-interface information */
+struct dvb_ca_private {
+	struct kref refcount;
+
+	/* pointer back to the public data structure */
+	struct dvb_ca_en50221 *pub;
+
+	/* the DVB device */
+	struct dvb_device *dvbdev;
+
+	/* Flags describing the interface (DVB_CA_FLAG_*) */
+	u32 flags;
+
+	/* number of slots supported by this CA interface */
+	unsigned int slot_count;
+
+	/* information on each slot */
+	struct dvb_ca_slot *slot_info;
+
+	/* wait queues for read() and write() operations */
+	wait_queue_head_t wait_queue;
+
+	/* PID of the monitoring thread */
+	struct task_struct *thread;
+
+	/* Flag indicating if the CA device is open */
+	unsigned int open:1;
+
+	/* Flag indicating the thread should wake up now */
+	unsigned int wakeup:1;
+
+	/* Delay the main thread should use */
+	unsigned long delay;
+
+	/*
+	 * Slot to start looking for data to read from in the next user-space
+	 * read operation
+	 */
+	int next_read_slot;
+
+	/* mutex serializing ioctls */
+	struct mutex ioctl_mutex;
+};
+
+static void dvb_ca_private_free(struct dvb_ca_private *ca)
+{
+	unsigned int i;
+
+	dvb_free_device(ca->dvbdev);
+	for (i = 0; i < ca->slot_count; i++)
+		vfree(ca->slot_info[i].rx_buffer.data);
+
+	kfree(ca->slot_info);
+	kfree(ca);
+}
+
+static void dvb_ca_private_release(struct kref *ref)
+{
+	struct dvb_ca_private *ca;
+
+	ca = container_of(ref, struct dvb_ca_private, refcount);
+	dvb_ca_private_free(ca);
+}
+
+static void dvb_ca_private_get(struct dvb_ca_private *ca)
+{
+	kref_get(&ca->refcount);
+}
+
+static void dvb_ca_private_put(struct dvb_ca_private *ca)
+{
+	kref_put(&ca->refcount, dvb_ca_private_release);
+}
+
+static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca);
+static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot,
+				    u8 *ebuf, int ecount);
+static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot,
+				     u8 *ebuf, int ecount);
+
+/**
+ * Safely find needle in haystack.
+ *
+ * @haystack: Buffer to look in.
+ * @hlen: Number of bytes in haystack.
+ * @needle: Buffer to find.
+ * @nlen: Number of bytes in needle.
+ * return: Pointer into haystack needle was found at, or NULL if not found.
+ */
+static char *findstr(char *haystack, int hlen, char *needle, int nlen)
+{
+	int i;
+
+	if (hlen < nlen)
+		return NULL;
+
+	for (i = 0; i <= hlen - nlen; i++) {
+		if (!strncmp(haystack + i, needle, nlen))
+			return haystack + i;
+	}
+
+	return NULL;
+}
+
+/* ************************************************************************** */
+/* EN50221 physical interface functions */
+
+/*
+ * dvb_ca_en50221_check_camstatus - Check CAM status.
+ */
+static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot)
+{
+	struct dvb_ca_slot *sl = &ca->slot_info[slot];
+	int slot_status;
+	int cam_present_now;
+	int cam_changed;
+
+	/* IRQ mode */
+	if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
+		return (atomic_read(&sl->camchange_count) != 0);
+
+	/* poll mode */
+	slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open);
+
+	cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0;
+	cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0;
+	if (!cam_changed) {
+		int cam_present_old = (sl->slot_state != DVB_CA_SLOTSTATE_NONE);
+
+		cam_changed = (cam_present_now != cam_present_old);
+	}
+
+	if (cam_changed) {
+		if (!cam_present_now)
+			sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
+		else
+			sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED;
+		atomic_set(&sl->camchange_count, 1);
+	} else {
+		if ((sl->slot_state == DVB_CA_SLOTSTATE_WAITREADY) &&
+		    (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) {
+			/* move to validate state if reset is completed */
+			sl->slot_state = DVB_CA_SLOTSTATE_VALIDATE;
+		}
+	}
+
+	return cam_changed;
+}
+
+/**
+ * dvb_ca_en50221_wait_if_status - Wait for flags to become set on the STATUS
+ *	 register on a CAM interface, checking for errors and timeout.
+ *
+ * @ca: CA instance.
+ * @slot: Slot on interface.
+ * @waitfor: Flags to wait for.
+ * @timeout_hz: Timeout in milliseconds.
+ *
+ * return: 0 on success, nonzero on error.
+ */
+static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot,
+					 u8 waitfor, int timeout_hz)
+{
+	unsigned long timeout;
+	unsigned long start;
+
+	dprintk("%s\n", __func__);
+
+	/* loop until timeout elapsed */
+	start = jiffies;
+	timeout = jiffies + timeout_hz;
+	while (1) {
+		int res;
+
+		/* read the status and check for error */
+		res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
+		if (res < 0)
+			return -EIO;
+
+		/* if we got the flags, it was successful! */
+		if (res & waitfor) {
+			dprintk("%s succeeded timeout:%lu\n",
+				__func__, jiffies - start);
+			return 0;
+		}
+
+		/* check for timeout */
+		if (time_after(jiffies, timeout))
+			break;
+
+		/* wait for a bit */
+		usleep_range(1000, 1100);
+	}
+
+	dprintk("%s failed timeout:%lu\n", __func__, jiffies - start);
+
+	/* if we get here, we've timed out */
+	return -ETIMEDOUT;
+}
+
+/**
+ * dvb_ca_en50221_link_init - Initialise the link layer connection to a CAM.
+ *
+ * @ca: CA instance.
+ * @slot: Slot id.
+ *
+ * return: 0 on success, nonzero on failure.
+ */
+static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot)
+{
+	struct dvb_ca_slot *sl = &ca->slot_info[slot];
+	int ret;
+	int buf_size;
+	u8 buf[2];
+
+	dprintk("%s\n", __func__);
+
+	/* we'll be determining these during this function */
+	sl->da_irq_supported = 0;
+
+	/*
+	 * set the host link buffer size temporarily. it will be overwritten
+	 * with the real negotiated size later.
+	 */
+	sl->link_buf_size = 2;
+
+	/* read the buffer size from the CAM */
+	ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
+					 IRQEN | CMDREG_SR);
+	if (ret)
+		return ret;
+	ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ);
+	if (ret)
+		return ret;
+	ret = dvb_ca_en50221_read_data(ca, slot, buf, 2);
+	if (ret != 2)
+		return -EIO;
+	ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
+	if (ret)
+		return ret;
+
+	/*
+	 * store it, and choose the minimum of our buffer and the CAM's buffer
+	 * size
+	 */
+	buf_size = (buf[0] << 8) | buf[1];
+	if (buf_size > HOST_LINK_BUF_SIZE)
+		buf_size = HOST_LINK_BUF_SIZE;
+	sl->link_buf_size = buf_size;
+	buf[0] = buf_size >> 8;
+	buf[1] = buf_size & 0xff;
+	dprintk("Chosen link buffer size of %i\n", buf_size);
+
+	/* write the buffer size to the CAM */
+	ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
+					 IRQEN | CMDREG_SW);
+	if (ret)
+		return ret;
+	ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10);
+	if (ret)
+		return ret;
+	ret = dvb_ca_en50221_write_data(ca, slot, buf, 2);
+	if (ret != 2)
+		return -EIO;
+	ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
+	if (ret)
+		return ret;
+
+	/* success */
+	return 0;
+}
+
+/**
+ * dvb_ca_en50221_read_tuple - Read a tuple from attribute memory.
+ *
+ * @ca: CA instance.
+ * @slot: Slot id.
+ * @address: Address to read from. Updated.
+ * @tuple_type: Tuple id byte. Updated.
+ * @tuple_length: Tuple length. Updated.
+ * @tuple: Dest buffer for tuple (must be 256 bytes). Updated.
+ *
+ * return: 0 on success, nonzero on error.
+ */
+static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot,
+				     int *address, int *tuple_type,
+				     int *tuple_length, u8 *tuple)
+{
+	int i;
+	int _tuple_type;
+	int _tuple_length;
+	int _address = *address;
+
+	/* grab the next tuple length and type */
+	_tuple_type = ca->pub->read_attribute_mem(ca->pub, slot, _address);
+	if (_tuple_type < 0)
+		return _tuple_type;
+	if (_tuple_type == 0xff) {
+		dprintk("END OF CHAIN TUPLE type:0x%x\n", _tuple_type);
+		*address += 2;
+		*tuple_type = _tuple_type;
+		*tuple_length = 0;
+		return 0;
+	}
+	_tuple_length = ca->pub->read_attribute_mem(ca->pub, slot,
+						    _address + 2);
+	if (_tuple_length < 0)
+		return _tuple_length;
+	_address += 4;
+
+	dprintk("TUPLE type:0x%x length:%i\n", _tuple_type, _tuple_length);
+
+	/* read in the whole tuple */
+	for (i = 0; i < _tuple_length; i++) {
+		tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot,
+						       _address + (i * 2));
+		dprintk("  0x%02x: 0x%02x %c\n",
+			i, tuple[i] & 0xff,
+			((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
+	}
+	_address += (_tuple_length * 2);
+
+	/* success */
+	*tuple_type = _tuple_type;
+	*tuple_length = _tuple_length;
+	*address = _address;
+	return 0;
+}
+
+/**
+ * dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module,
+ *	extracting Config register, and checking it is a DVB CAM module.
+ *
+ * @ca: CA instance.
+ * @slot: Slot id.
+ *
+ * return: 0 on success, <0 on failure.
+ */
+static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot)
+{
+	struct dvb_ca_slot *sl;
+	int address = 0;
+	int tuple_length;
+	int tuple_type;
+	u8 tuple[257];
+	char *dvb_str;
+	int rasz;
+	int status;
+	int got_cftableentry = 0;
+	int end_chain = 0;
+	int i;
+	u16 manfid = 0;
+	u16 devid = 0;
+
+	/* CISTPL_DEVICE_0A */
+	status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
+					   &tuple_length, tuple);
+	if (status < 0)
+		return status;
+	if (tuple_type != 0x1D)
+		return -EINVAL;
+
+	/* CISTPL_DEVICE_0C */
+	status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
+					   &tuple_length, tuple);
+	if (status < 0)
+		return status;
+	if (tuple_type != 0x1C)
+		return -EINVAL;
+
+	/* CISTPL_VERS_1 */
+	status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
+					   &tuple_length, tuple);
+	if (status < 0)
+		return status;
+	if (tuple_type != 0x15)
+		return -EINVAL;
+
+	/* CISTPL_MANFID */
+	status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
+					   &tuple_length, tuple);
+	if (status < 0)
+		return status;
+	if (tuple_type != 0x20)
+		return -EINVAL;
+	if (tuple_length != 4)
+		return -EINVAL;
+	manfid = (tuple[1] << 8) | tuple[0];
+	devid = (tuple[3] << 8) | tuple[2];
+
+	/* CISTPL_CONFIG */
+	status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
+					   &tuple_length, tuple);
+	if (status < 0)
+		return status;
+	if (tuple_type != 0x1A)
+		return -EINVAL;
+	if (tuple_length < 3)
+		return -EINVAL;
+
+	/* extract the configbase */
+	rasz = tuple[0] & 3;
+	if (tuple_length < (3 + rasz + 14))
+		return -EINVAL;
+	sl = &ca->slot_info[slot];
+	sl->config_base = 0;
+	for (i = 0; i < rasz + 1; i++)
+		sl->config_base |= (tuple[2 + i] << (8 * i));
+
+	/* check it contains the correct DVB string */
+	dvb_str = findstr((char *)tuple, tuple_length, "DVB_CI_V", 8);
+	if (!dvb_str)
+		return -EINVAL;
+	if (tuple_length < ((dvb_str - (char *)tuple) + 12))
+		return -EINVAL;
+
+	/* is it a version we support? */
+	if (strncmp(dvb_str + 8, "1.00", 4)) {
+		pr_err("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n",
+		       ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9],
+		       dvb_str[10], dvb_str[11]);
+		return -EINVAL;
+	}
+
+	/* process the CFTABLE_ENTRY tuples, and any after those */
+	while ((!end_chain) && (address < 0x1000)) {
+		status = dvb_ca_en50221_read_tuple(ca, slot, &address,
+						   &tuple_type, &tuple_length,
+						   tuple);
+		if (status < 0)
+			return status;
+		switch (tuple_type) {
+		case 0x1B:	/* CISTPL_CFTABLE_ENTRY */
+			if (tuple_length < (2 + 11 + 17))
+				break;
+
+			/* if we've already parsed one, just use it */
+			if (got_cftableentry)
+				break;
+
+			/* get the config option */
+			sl->config_option = tuple[0] & 0x3f;
+
+			/* OK, check it contains the correct strings */
+			if (!findstr((char *)tuple, tuple_length,
+				     "DVB_HOST", 8) ||
+			    !findstr((char *)tuple, tuple_length,
+				     "DVB_CI_MODULE", 13))
+				break;
+
+			got_cftableentry = 1;
+			break;
+
+		case 0x14:	/* CISTPL_NO_LINK */
+			break;
+
+		case 0xFF:	/* CISTPL_END */
+			end_chain = 1;
+			break;
+
+		default:	/* Unknown tuple type - just skip this tuple */
+			dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n",
+				tuple_type, tuple_length);
+			break;
+		}
+	}
+
+	if ((address > 0x1000) || (!got_cftableentry))
+		return -EINVAL;
+
+	dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n",
+		manfid, devid, sl->config_base, sl->config_option);
+
+	/* success! */
+	return 0;
+}
+
+/**
+ * dvb_ca_en50221_set_configoption - Set CAM's configoption correctly.
+ *
+ * @ca: CA instance.
+ * @slot: Slot containing the CAM.
+ */
+static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot)
+{
+	struct dvb_ca_slot *sl = &ca->slot_info[slot];
+	int configoption;
+
+	dprintk("%s\n", __func__);
+
+	/* set the config option */
+	ca->pub->write_attribute_mem(ca->pub, slot, sl->config_base,
+				     sl->config_option);
+
+	/* check it */
+	configoption = ca->pub->read_attribute_mem(ca->pub, slot,
+						   sl->config_base);
+	dprintk("Set configoption 0x%x, read configoption 0x%x\n",
+		sl->config_option, configoption & 0x3f);
+
+	/* fine! */
+	return 0;
+}
+
+/**
+ * dvb_ca_en50221_read_data - This function talks to an EN50221 CAM control
+ *	interface. It reads a buffer of data from the CAM. The data can either
+ *	be stored in a supplied buffer, or automatically be added to the slot's
+ *	rx_buffer.
+ *
+ * @ca: CA instance.
+ * @slot: Slot to read from.
+ * @ebuf: If non-NULL, the data will be written to this buffer. If NULL,
+ *	  the data will be added into the buffering system as a normal
+ *	  fragment.
+ * @ecount: Size of ebuf. Ignored if ebuf is NULL.
+ *
+ * return: Number of bytes read, or < 0 on error
+ */
+static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot,
+				    u8 *ebuf, int ecount)
+{
+	struct dvb_ca_slot *sl = &ca->slot_info[slot];
+	int bytes_read;
+	int status;
+	u8 buf[HOST_LINK_BUF_SIZE];
+	int i;
+
+	dprintk("%s\n", __func__);
+
+	/* check if we have space for a link buf in the rx_buffer */
+	if (!ebuf) {
+		int buf_free;
+
+		if (!sl->rx_buffer.data) {
+			status = -EIO;
+			goto exit;
+		}
+		buf_free = dvb_ringbuffer_free(&sl->rx_buffer);
+
+		if (buf_free < (sl->link_buf_size +
+				DVB_RINGBUFFER_PKTHDRSIZE)) {
+			status = -EAGAIN;
+			goto exit;
+		}
+	}
+
+	if (ca->pub->read_data &&
+	    (sl->slot_state != DVB_CA_SLOTSTATE_LINKINIT)) {
+		if (!ebuf)
+			status = ca->pub->read_data(ca->pub, slot, buf,
+						    sizeof(buf));
+		else
+			status = ca->pub->read_data(ca->pub, slot, buf, ecount);
+		if (status < 0)
+			return status;
+		bytes_read =  status;
+		if (status == 0)
+			goto exit;
+	} else {
+		/* check if there is data available */
+		status = ca->pub->read_cam_control(ca->pub, slot,
+						   CTRLIF_STATUS);
+		if (status < 0)
+			goto exit;
+		if (!(status & STATUSREG_DA)) {
+			/* no data */
+			status = 0;
+			goto exit;
+		}
+
+		/* read the amount of data */
+		status = ca->pub->read_cam_control(ca->pub, slot,
+						   CTRLIF_SIZE_HIGH);
+		if (status < 0)
+			goto exit;
+		bytes_read = status << 8;
+		status = ca->pub->read_cam_control(ca->pub, slot,
+						   CTRLIF_SIZE_LOW);
+		if (status < 0)
+			goto exit;
+		bytes_read |= status;
+
+		/* check it will fit */
+		if (!ebuf) {
+			if (bytes_read > sl->link_buf_size) {
+				pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n",
+				       ca->dvbdev->adapter->num, bytes_read,
+				       sl->link_buf_size);
+				sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT;
+				status = -EIO;
+				goto exit;
+			}
+			if (bytes_read < 2) {
+				pr_err("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n",
+				       ca->dvbdev->adapter->num);
+				sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT;
+				status = -EIO;
+				goto exit;
+			}
+		} else {
+			if (bytes_read > ecount) {
+				pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n",
+				       ca->dvbdev->adapter->num);
+				status = -EIO;
+				goto exit;
+			}
+		}
+
+		/* fill the buffer */
+		for (i = 0; i < bytes_read; i++) {
+			/* read byte and check */
+			status = ca->pub->read_cam_control(ca->pub, slot,
+							   CTRLIF_DATA);
+			if (status < 0)
+				goto exit;
+
+			/* OK, store it in the buffer */
+			buf[i] = status;
+		}
+
+		/* check for read error (RE should now be 0) */
+		status = ca->pub->read_cam_control(ca->pub, slot,
+						   CTRLIF_STATUS);
+		if (status < 0)
+			goto exit;
+		if (status & STATUSREG_RE) {
+			sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT;
+			status = -EIO;
+			goto exit;
+		}
+	}
+
+	/*
+	 * OK, add it to the receive buffer, or copy into external buffer if
+	 * supplied
+	 */
+	if (!ebuf) {
+		if (!sl->rx_buffer.data) {
+			status = -EIO;
+			goto exit;
+		}
+		dvb_ringbuffer_pkt_write(&sl->rx_buffer, buf, bytes_read);
+	} else {
+		memcpy(ebuf, buf, bytes_read);
+	}
+
+	dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot,
+		buf[0], (buf[1] & 0x80) == 0, bytes_read);
+
+	/* wake up readers when a last_fragment is received */
+	if ((buf[1] & 0x80) == 0x00)
+		wake_up_interruptible(&ca->wait_queue);
+
+	status = bytes_read;
+
+exit:
+	return status;
+}
+
+/**
+ * dvb_ca_en50221_write_data - This function talks to an EN50221 CAM control
+ *				interface. It writes a buffer of data to a CAM.
+ *
+ * @ca: CA instance.
+ * @slot: Slot to write to.
+ * @buf: The data in this buffer is treated as a complete link-level packet to
+ *	 be written.
+ * @bytes_write: Size of ebuf.
+ *
+ * return: Number of bytes written, or < 0 on error.
+ */
+static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot,
+				     u8 *buf, int bytes_write)
+{
+	struct dvb_ca_slot *sl = &ca->slot_info[slot];
+	int status;
+	int i;
+
+	dprintk("%s\n", __func__);
+
+	/* sanity check */
+	if (bytes_write > sl->link_buf_size)
+		return -EINVAL;
+
+	if (ca->pub->write_data &&
+	    (sl->slot_state != DVB_CA_SLOTSTATE_LINKINIT))
+		return ca->pub->write_data(ca->pub, slot, buf, bytes_write);
+
+	/*
+	 * it is possible we are dealing with a single buffer implementation,
+	 * thus if there is data available for read or if there is even a read
+	 * already in progress, we do nothing but awake the kernel thread to
+	 * process the data if necessary.
+	 */
+	status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
+	if (status < 0)
+		goto exitnowrite;
+	if (status & (STATUSREG_DA | STATUSREG_RE)) {
+		if (status & STATUSREG_DA)
+			dvb_ca_en50221_thread_wakeup(ca);
+
+		status = -EAGAIN;
+		goto exitnowrite;
+	}
+
+	/* OK, set HC bit */
+	status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
+					    IRQEN | CMDREG_HC);
+	if (status)
+		goto exit;
+
+	/* check if interface is still free */
+	status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
+	if (status < 0)
+		goto exit;
+	if (!(status & STATUSREG_FR)) {
+		/* it wasn't free => try again later */
+		status = -EAGAIN;
+		goto exit;
+	}
+
+	/*
+	 * It may need some time for the CAM to settle down, or there might
+	 * be a race condition between the CAM, writing HC and our last
+	 * check for DA. This happens, if the CAM asserts DA, just after
+	 * checking DA before we are setting HC. In this case it might be
+	 * a bug in the CAM to keep the FR bit, the lower layer/HW
+	 * communication requires a longer timeout or the CAM needs more
+	 * time internally. But this happens in reality!
+	 * We need to read the status from the HW again and do the same
+	 * we did for the previous check for DA
+	 */
+	status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
+	if (status < 0)
+		goto exit;
+
+	if (status & (STATUSREG_DA | STATUSREG_RE)) {
+		if (status & STATUSREG_DA)
+			dvb_ca_en50221_thread_wakeup(ca);
+
+		status = -EAGAIN;
+		goto exit;
+	}
+
+	/* send the amount of data */
+	status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH,
+					    bytes_write >> 8);
+	if (status)
+		goto exit;
+	status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW,
+					    bytes_write & 0xff);
+	if (status)
+		goto exit;
+
+	/* send the buffer */
+	for (i = 0; i < bytes_write; i++) {
+		status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA,
+						    buf[i]);
+		if (status)
+			goto exit;
+	}
+
+	/* check for write error (WE should now be 0) */
+	status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
+	if (status < 0)
+		goto exit;
+	if (status & STATUSREG_WE) {
+		sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT;
+		status = -EIO;
+		goto exit;
+	}
+	status = bytes_write;
+
+	dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot,
+		buf[0], (buf[1] & 0x80) == 0, bytes_write);
+
+exit:
+	ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
+
+exitnowrite:
+	return status;
+}
+
+/* ************************************************************************** */
+/* EN50221 higher level functions */
+
+/**
+ * dvb_ca_en50221_slot_shutdown - A CAM has been removed => shut it down.
+ *
+ * @ca: CA instance.
+ * @slot: Slot to shut down.
+ */
+static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot)
+{
+	dprintk("%s\n", __func__);
+
+	ca->pub->slot_shutdown(ca->pub, slot);
+	ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
+
+	/*
+	 * need to wake up all processes to check if they're now trying to
+	 * write to a defunct CAM
+	 */
+	wake_up_interruptible(&ca->wait_queue);
+
+	dprintk("Slot %i shutdown\n", slot);
+
+	/* success */
+	return 0;
+}
+
+/**
+ * dvb_ca_en50221_camchange_irq - A CAMCHANGE IRQ has occurred.
+ *
+ * @pubca: CA instance.
+ * @slot: Slot concerned.
+ * @change_type: One of the DVB_CA_CAMCHANGE_* values.
+ */
+void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot,
+				  int change_type)
+{
+	struct dvb_ca_private *ca = pubca->private;
+	struct dvb_ca_slot *sl = &ca->slot_info[slot];
+
+	dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type);
+
+	switch (change_type) {
+	case DVB_CA_EN50221_CAMCHANGE_REMOVED:
+	case DVB_CA_EN50221_CAMCHANGE_INSERTED:
+		break;
+
+	default:
+		return;
+	}
+
+	sl->camchange_type = change_type;
+	atomic_inc(&sl->camchange_count);
+	dvb_ca_en50221_thread_wakeup(ca);
+}
+EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq);
+
+/**
+ * dvb_ca_en50221_camready_irq - A CAMREADY IRQ has occurred.
+ *
+ * @pubca: CA instance.
+ * @slot: Slot concerned.
+ */
+void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot)
+{
+	struct dvb_ca_private *ca = pubca->private;
+	struct dvb_ca_slot *sl = &ca->slot_info[slot];
+
+	dprintk("CAMREADY IRQ slot:%i\n", slot);
+
+	if (sl->slot_state == DVB_CA_SLOTSTATE_WAITREADY) {
+		sl->slot_state = DVB_CA_SLOTSTATE_VALIDATE;
+		dvb_ca_en50221_thread_wakeup(ca);
+	}
+}
+EXPORT_SYMBOL(dvb_ca_en50221_camready_irq);
+
+/**
+ * dvb_ca_en50221_frda_irq - An FR or DA IRQ has occurred.
+ *
+ * @pubca: CA instance.
+ * @slot: Slot concerned.
+ */
+void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot)
+{
+	struct dvb_ca_private *ca = pubca->private;
+	struct dvb_ca_slot *sl = &ca->slot_info[slot];
+	int flags;
+
+	dprintk("FR/DA IRQ slot:%i\n", slot);
+
+	switch (sl->slot_state) {
+	case DVB_CA_SLOTSTATE_LINKINIT:
+		flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
+		if (flags & STATUSREG_DA) {
+			dprintk("CAM supports DA IRQ\n");
+			sl->da_irq_supported = 1;
+		}
+		break;
+
+	case DVB_CA_SLOTSTATE_RUNNING:
+		if (ca->open)
+			dvb_ca_en50221_thread_wakeup(ca);
+		break;
+	}
+}
+EXPORT_SYMBOL(dvb_ca_en50221_frda_irq);
+
+/* ************************************************************************** */
+/* EN50221 thread functions */
+
+/**
+ * Wake up the DVB CA thread
+ *
+ * @ca: CA instance.
+ */
+static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca)
+{
+	dprintk("%s\n", __func__);
+
+	ca->wakeup = 1;
+	mb();
+	wake_up_process(ca->thread);
+}
+
+/**
+ * Update the delay used by the thread.
+ *
+ * @ca: CA instance.
+ */
+static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
+{
+	int delay;
+	int curdelay = 100000000;
+	int slot;
+
+	/*
+	 * Beware of too high polling frequency, because one polling
+	 * call might take several hundred milliseconds until timeout!
+	 */
+	for (slot = 0; slot < ca->slot_count; slot++) {
+		struct dvb_ca_slot *sl = &ca->slot_info[slot];
+
+		switch (sl->slot_state) {
+		default:
+		case DVB_CA_SLOTSTATE_NONE:
+			delay = HZ * 60;  /* 60s */
+			if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
+				delay = HZ * 5;  /* 5s */
+			break;
+		case DVB_CA_SLOTSTATE_INVALID:
+			delay = HZ * 60;  /* 60s */
+			if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
+				delay = HZ / 10;  /* 100ms */
+			break;
+
+		case DVB_CA_SLOTSTATE_UNINITIALISED:
+		case DVB_CA_SLOTSTATE_WAITREADY:
+		case DVB_CA_SLOTSTATE_VALIDATE:
+		case DVB_CA_SLOTSTATE_WAITFR:
+		case DVB_CA_SLOTSTATE_LINKINIT:
+			delay = HZ / 10;  /* 100ms */
+			break;
+
+		case DVB_CA_SLOTSTATE_RUNNING:
+			delay = HZ * 60;  /* 60s */
+			if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
+				delay = HZ / 10;  /* 100ms */
+			if (ca->open) {
+				if ((!sl->da_irq_supported) ||
+				    (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA)))
+					delay = HZ / 10;  /* 100ms */
+			}
+			break;
+		}
+
+		if (delay < curdelay)
+			curdelay = delay;
+	}
+
+	ca->delay = curdelay;
+}
+
+/**
+ * Poll if the CAM is gone.
+ *
+ * @ca: CA instance.
+ * @slot: Slot to process.
+ * return:: 0 .. no change
+ *          1 .. CAM state changed
+ */
+
+static int dvb_ca_en50221_poll_cam_gone(struct dvb_ca_private *ca, int slot)
+{
+	int changed = 0;
+	int status;
+
+	/*
+	 * we need this extra check for annoying interfaces like the
+	 * budget-av
+	 */
+	if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
+	    (ca->pub->poll_slot_status)) {
+		status = ca->pub->poll_slot_status(ca->pub, slot, 0);
+		if (!(status &
+			DVB_CA_EN50221_POLL_CAM_PRESENT)) {
+			ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
+			dvb_ca_en50221_thread_update_delay(ca);
+			changed = 1;
+		}
+	}
+	return changed;
+}
+
+/**
+ * Thread state machine for one CA slot to perform the data transfer.
+ *
+ * @ca: CA instance.
+ * @slot: Slot to process.
+ */
+static void dvb_ca_en50221_thread_state_machine(struct dvb_ca_private *ca,
+						int slot)
+{
+	struct dvb_ca_slot *sl = &ca->slot_info[slot];
+	int flags;
+	int pktcount;
+	void *rxbuf;
+
+	mutex_lock(&sl->slot_lock);
+
+	/* check the cam status + deal with CAMCHANGEs */
+	while (dvb_ca_en50221_check_camstatus(ca, slot)) {
+		/* clear down an old CI slot if necessary */
+		if (sl->slot_state != DVB_CA_SLOTSTATE_NONE)
+			dvb_ca_en50221_slot_shutdown(ca, slot);
+
+		/* if a CAM is NOW present, initialise it */
+		if (sl->camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED)
+			sl->slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
+
+		/* we've handled one CAMCHANGE */
+		dvb_ca_en50221_thread_update_delay(ca);
+		atomic_dec(&sl->camchange_count);
+	}
+
+	/* CAM state machine */
+	switch (sl->slot_state) {
+	case DVB_CA_SLOTSTATE_NONE:
+	case DVB_CA_SLOTSTATE_INVALID:
+		/* no action needed */
+		break;
+
+	case DVB_CA_SLOTSTATE_UNINITIALISED:
+		sl->slot_state = DVB_CA_SLOTSTATE_WAITREADY;
+		ca->pub->slot_reset(ca->pub, slot);
+		sl->timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
+		break;
+
+	case DVB_CA_SLOTSTATE_WAITREADY:
+		if (time_after(jiffies, sl->timeout)) {
+			pr_err("dvb_ca adaptor %d: PC card did not respond :(\n",
+			       ca->dvbdev->adapter->num);
+			sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
+			dvb_ca_en50221_thread_update_delay(ca);
+			break;
+		}
+		/*
+		 * no other action needed; will automatically change state when
+		 * ready
+		 */
+		break;
+
+	case DVB_CA_SLOTSTATE_VALIDATE:
+		if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) {
+			if (dvb_ca_en50221_poll_cam_gone(ca, slot))
+				break;
+
+			pr_err("dvb_ca adapter %d: Invalid PC card inserted :(\n",
+			       ca->dvbdev->adapter->num);
+			sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
+			dvb_ca_en50221_thread_update_delay(ca);
+			break;
+		}
+		if (dvb_ca_en50221_set_configoption(ca, slot) != 0) {
+			pr_err("dvb_ca adapter %d: Unable to initialise CAM :(\n",
+			       ca->dvbdev->adapter->num);
+			sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
+			dvb_ca_en50221_thread_update_delay(ca);
+			break;
+		}
+		if (ca->pub->write_cam_control(ca->pub, slot,
+					       CTRLIF_COMMAND,
+					       CMDREG_RS) != 0) {
+			pr_err("dvb_ca adapter %d: Unable to reset CAM IF\n",
+			       ca->dvbdev->adapter->num);
+			sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
+			dvb_ca_en50221_thread_update_delay(ca);
+			break;
+		}
+		dprintk("DVB CAM validated successfully\n");
+
+		sl->timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
+		sl->slot_state = DVB_CA_SLOTSTATE_WAITFR;
+		ca->wakeup = 1;
+		break;
+
+	case DVB_CA_SLOTSTATE_WAITFR:
+		if (time_after(jiffies, sl->timeout)) {
+			pr_err("dvb_ca adapter %d: DVB CAM did not respond :(\n",
+			       ca->dvbdev->adapter->num);
+			sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
+			dvb_ca_en50221_thread_update_delay(ca);
+			break;
+		}
+
+		flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
+		if (flags & STATUSREG_FR) {
+			sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT;
+			ca->wakeup = 1;
+		}
+		break;
+
+	case DVB_CA_SLOTSTATE_LINKINIT:
+		if (dvb_ca_en50221_link_init(ca, slot) != 0) {
+			if (dvb_ca_en50221_poll_cam_gone(ca, slot))
+				break;
+
+			pr_err("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n",
+			       ca->dvbdev->adapter->num);
+			sl->slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
+			dvb_ca_en50221_thread_update_delay(ca);
+			break;
+		}
+
+		if (!sl->rx_buffer.data) {
+			rxbuf = vmalloc(RX_BUFFER_SIZE);
+			if (!rxbuf) {
+				pr_err("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n",
+				       ca->dvbdev->adapter->num);
+				sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
+				dvb_ca_en50221_thread_update_delay(ca);
+				break;
+			}
+			dvb_ringbuffer_init(&sl->rx_buffer, rxbuf,
+					    RX_BUFFER_SIZE);
+		}
+
+		ca->pub->slot_ts_enable(ca->pub, slot);
+		sl->slot_state = DVB_CA_SLOTSTATE_RUNNING;
+		dvb_ca_en50221_thread_update_delay(ca);
+		pr_info("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n",
+			ca->dvbdev->adapter->num);
+		break;
+
+	case DVB_CA_SLOTSTATE_RUNNING:
+		if (!ca->open)
+			break;
+
+		/* poll slots for data */
+		pktcount = 0;
+		while (dvb_ca_en50221_read_data(ca, slot, NULL, 0) > 0) {
+			if (!ca->open)
+				break;
+
+			/*
+			 * if a CAMCHANGE occurred at some point, do not do any
+			 * more processing of this slot
+			 */
+			if (dvb_ca_en50221_check_camstatus(ca, slot)) {
+				/*
+				 * we don't want to sleep on the next iteration
+				 * so we can handle the cam change
+				 */
+				ca->wakeup = 1;
+				break;
+			}
+
+			/* check if we've hit our limit this time */
+			if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) {
+				/*
+				 * don't sleep; there is likely to be more data
+				 * to read
+				 */
+				ca->wakeup = 1;
+				break;
+			}
+		}
+		break;
+	}
+
+	mutex_unlock(&sl->slot_lock);
+}
+
+/*
+ * Kernel thread which monitors CA slots for CAM changes, and performs data
+ * transfers.
+ */
+static int dvb_ca_en50221_thread(void *data)
+{
+	struct dvb_ca_private *ca = data;
+	int slot;
+
+	dprintk("%s\n", __func__);
+
+	/* choose the correct initial delay */
+	dvb_ca_en50221_thread_update_delay(ca);
+
+	/* main loop */
+	while (!kthread_should_stop()) {
+		/* sleep for a bit */
+		if (!ca->wakeup) {
+			set_current_state(TASK_INTERRUPTIBLE);
+			schedule_timeout(ca->delay);
+			if (kthread_should_stop())
+				return 0;
+		}
+		ca->wakeup = 0;
+
+		/* go through all the slots processing them */
+		for (slot = 0; slot < ca->slot_count; slot++)
+			dvb_ca_en50221_thread_state_machine(ca, slot);
+	}
+
+	return 0;
+}
+
+/* ************************************************************************** */
+/* EN50221 IO interface functions */
+
+/**
+ * Real ioctl implementation.
+ * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them.
+ *
+ * @file: File concerned.
+ * @cmd: IOCTL command.
+ * @parg: Associated argument.
+ *
+ * return: 0 on success, <0 on error.
+ */
+static int dvb_ca_en50221_io_do_ioctl(struct file *file,
+				      unsigned int cmd, void *parg)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_ca_private *ca = dvbdev->priv;
+	int err = 0;
+	int slot;
+
+	dprintk("%s\n", __func__);
+
+	if (mutex_lock_interruptible(&ca->ioctl_mutex))
+		return -ERESTARTSYS;
+
+	switch (cmd) {
+	case CA_RESET:
+		for (slot = 0; slot < ca->slot_count; slot++) {
+			struct dvb_ca_slot *sl = &ca->slot_info[slot];
+
+			mutex_lock(&sl->slot_lock);
+			if (sl->slot_state != DVB_CA_SLOTSTATE_NONE) {
+				dvb_ca_en50221_slot_shutdown(ca, slot);
+				if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
+					dvb_ca_en50221_camchange_irq(ca->pub,
+								     slot,
+								     DVB_CA_EN50221_CAMCHANGE_INSERTED);
+			}
+			mutex_unlock(&sl->slot_lock);
+		}
+		ca->next_read_slot = 0;
+		dvb_ca_en50221_thread_wakeup(ca);
+		break;
+
+	case CA_GET_CAP: {
+		struct ca_caps *caps = parg;
+
+		caps->slot_num = ca->slot_count;
+		caps->slot_type = CA_CI_LINK;
+		caps->descr_num = 0;
+		caps->descr_type = 0;
+		break;
+	}
+
+	case CA_GET_SLOT_INFO: {
+		struct ca_slot_info *info = parg;
+		struct dvb_ca_slot *sl;
+
+		slot = info->num;
+		if ((slot >= ca->slot_count) || (slot < 0)) {
+			err = -EINVAL;
+			goto out_unlock;
+		}
+
+		info->type = CA_CI_LINK;
+		info->flags = 0;
+		sl = &ca->slot_info[slot];
+		if ((sl->slot_state != DVB_CA_SLOTSTATE_NONE) &&
+		    (sl->slot_state != DVB_CA_SLOTSTATE_INVALID)) {
+			info->flags = CA_CI_MODULE_PRESENT;
+		}
+		if (sl->slot_state == DVB_CA_SLOTSTATE_RUNNING)
+			info->flags |= CA_CI_MODULE_READY;
+		break;
+	}
+
+	default:
+		err = -EINVAL;
+		break;
+	}
+
+out_unlock:
+	mutex_unlock(&ca->ioctl_mutex);
+	return err;
+}
+
+/**
+ * Wrapper for ioctl implementation.
+ *
+ * @file: File concerned.
+ * @cmd: IOCTL command.
+ * @arg: Associated argument.
+ *
+ * return: 0 on success, <0 on error.
+ */
+static long dvb_ca_en50221_io_ioctl(struct file *file,
+				    unsigned int cmd, unsigned long arg)
+{
+	return dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl);
+}
+
+/**
+ * Implementation of write() syscall.
+ *
+ * @file: File structure.
+ * @buf: Source buffer.
+ * @count: Size of source buffer.
+ * @ppos: Position in file (ignored).
+ *
+ * return: Number of bytes read, or <0 on error.
+ */
+static ssize_t dvb_ca_en50221_io_write(struct file *file,
+				       const char __user *buf, size_t count,
+				       loff_t *ppos)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_ca_private *ca = dvbdev->priv;
+	struct dvb_ca_slot *sl;
+	u8 slot, connection_id;
+	int status;
+	u8 fragbuf[HOST_LINK_BUF_SIZE];
+	int fragpos = 0;
+	int fraglen;
+	unsigned long timeout;
+	int written;
+
+	dprintk("%s\n", __func__);
+
+	/*
+	 * Incoming packet has a 2 byte header.
+	 * hdr[0] = slot_id, hdr[1] = connection_id
+	 */
+	if (count < 2)
+		return -EINVAL;
+
+	/* extract slot & connection id */
+	if (copy_from_user(&slot, buf, 1))
+		return -EFAULT;
+	if (copy_from_user(&connection_id, buf + 1, 1))
+		return -EFAULT;
+	buf += 2;
+	count -= 2;
+
+	if (slot >= ca->slot_count)
+		return -EINVAL;
+	slot = array_index_nospec(slot, ca->slot_count);
+	sl = &ca->slot_info[slot];
+
+	/* check if the slot is actually running */
+	if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING)
+		return -EINVAL;
+
+	/* fragment the packets & store in the buffer */
+	while (fragpos < count) {
+		fraglen = sl->link_buf_size - 2;
+		if (fraglen < 0)
+			break;
+		if (fraglen > HOST_LINK_BUF_SIZE - 2)
+			fraglen = HOST_LINK_BUF_SIZE - 2;
+		if ((count - fragpos) < fraglen)
+			fraglen = count - fragpos;
+
+		fragbuf[0] = connection_id;
+		fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
+		status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen);
+		if (status) {
+			status = -EFAULT;
+			goto exit;
+		}
+
+		timeout = jiffies + HZ / 2;
+		written = 0;
+		while (!time_after(jiffies, timeout)) {
+			/*
+			 * check the CAM hasn't been removed/reset in the
+			 * meantime
+			 */
+			if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING) {
+				status = -EIO;
+				goto exit;
+			}
+
+			mutex_lock(&sl->slot_lock);
+			status = dvb_ca_en50221_write_data(ca, slot, fragbuf,
+							   fraglen + 2);
+			mutex_unlock(&sl->slot_lock);
+			if (status == (fraglen + 2)) {
+				written = 1;
+				break;
+			}
+			if (status != -EAGAIN)
+				goto exit;
+
+			usleep_range(1000, 1100);
+		}
+		if (!written) {
+			status = -EIO;
+			goto exit;
+		}
+
+		fragpos += fraglen;
+	}
+	status = count + 2;
+
+exit:
+	return status;
+}
+
+/*
+ * Condition for waking up in dvb_ca_en50221_io_read_condition
+ */
+static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca,
+					    int *result, int *_slot)
+{
+	int slot;
+	int slot_count = 0;
+	int idx;
+	size_t fraglen;
+	int connection_id = -1;
+	int found = 0;
+	u8 hdr[2];
+
+	slot = ca->next_read_slot;
+	while ((slot_count < ca->slot_count) && (!found)) {
+		struct dvb_ca_slot *sl = &ca->slot_info[slot];
+
+		if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING)
+			goto nextslot;
+
+		if (!sl->rx_buffer.data)
+			return 0;
+
+		idx = dvb_ringbuffer_pkt_next(&sl->rx_buffer, -1, &fraglen);
+		while (idx != -1) {
+			dvb_ringbuffer_pkt_read(&sl->rx_buffer, idx, 0, hdr, 2);
+			if (connection_id == -1)
+				connection_id = hdr[0];
+			if ((hdr[0] == connection_id) &&
+			    ((hdr[1] & 0x80) == 0)) {
+				*_slot = slot;
+				found = 1;
+				break;
+			}
+
+			idx = dvb_ringbuffer_pkt_next(&sl->rx_buffer, idx,
+						      &fraglen);
+		}
+
+nextslot:
+		slot = (slot + 1) % ca->slot_count;
+		slot_count++;
+	}
+
+	ca->next_read_slot = slot;
+	return found;
+}
+
+/**
+ * Implementation of read() syscall.
+ *
+ * @file: File structure.
+ * @buf: Destination buffer.
+ * @count: Size of destination buffer.
+ * @ppos: Position in file (ignored).
+ *
+ * return: Number of bytes read, or <0 on error.
+ */
+static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user *buf,
+				      size_t count, loff_t *ppos)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_ca_private *ca = dvbdev->priv;
+	struct dvb_ca_slot *sl;
+	int status;
+	int result = 0;
+	u8 hdr[2];
+	int slot;
+	int connection_id = -1;
+	size_t idx, idx2;
+	int last_fragment = 0;
+	size_t fraglen;
+	int pktlen;
+	int dispose = 0;
+
+	dprintk("%s\n", __func__);
+
+	/*
+	 * Outgoing packet has a 2 byte header.
+	 * hdr[0] = slot_id, hdr[1] = connection_id
+	 */
+	if (count < 2)
+		return -EINVAL;
+
+	/* wait for some data */
+	status = dvb_ca_en50221_io_read_condition(ca, &result, &slot);
+	if (status == 0) {
+		/* if we're in nonblocking mode, exit immediately */
+		if (file->f_flags & O_NONBLOCK)
+			return -EWOULDBLOCK;
+
+		/* wait for some data */
+		status = wait_event_interruptible(ca->wait_queue,
+						  dvb_ca_en50221_io_read_condition
+						  (ca, &result, &slot));
+	}
+	if ((status < 0) || (result < 0)) {
+		if (result)
+			return result;
+		return status;
+	}
+
+	sl = &ca->slot_info[slot];
+	idx = dvb_ringbuffer_pkt_next(&sl->rx_buffer, -1, &fraglen);
+	pktlen = 2;
+	do {
+		if (idx == -1) {
+			pr_err("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n",
+			       ca->dvbdev->adapter->num);
+			status = -EIO;
+			goto exit;
+		}
+
+		dvb_ringbuffer_pkt_read(&sl->rx_buffer, idx, 0, hdr, 2);
+		if (connection_id == -1)
+			connection_id = hdr[0];
+		if (hdr[0] == connection_id) {
+			if (pktlen < count) {
+				if ((pktlen + fraglen - 2) > count)
+					fraglen = count - pktlen;
+				else
+					fraglen -= 2;
+
+				status =
+				   dvb_ringbuffer_pkt_read_user(&sl->rx_buffer,
+								idx, 2,
+								buf + pktlen,
+								fraglen);
+				if (status < 0)
+					goto exit;
+
+				pktlen += fraglen;
+			}
+
+			if ((hdr[1] & 0x80) == 0)
+				last_fragment = 1;
+			dispose = 1;
+		}
+
+		idx2 = dvb_ringbuffer_pkt_next(&sl->rx_buffer, idx, &fraglen);
+		if (dispose)
+			dvb_ringbuffer_pkt_dispose(&sl->rx_buffer, idx);
+		idx = idx2;
+		dispose = 0;
+	} while (!last_fragment);
+
+	hdr[0] = slot;
+	hdr[1] = connection_id;
+	status = copy_to_user(buf, hdr, 2);
+	if (status) {
+		status = -EFAULT;
+		goto exit;
+	}
+	status = pktlen;
+
+exit:
+	return status;
+}
+
+/**
+ * Implementation of file open syscall.
+ *
+ * @inode: Inode concerned.
+ * @file: File concerned.
+ *
+ * return: 0 on success, <0 on failure.
+ */
+static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_ca_private *ca = dvbdev->priv;
+	int err;
+	int i;
+
+	dprintk("%s\n", __func__);
+
+	if (!try_module_get(ca->pub->owner))
+		return -EIO;
+
+	err = dvb_generic_open(inode, file);
+	if (err < 0) {
+		module_put(ca->pub->owner);
+		return err;
+	}
+
+	for (i = 0; i < ca->slot_count; i++) {
+		struct dvb_ca_slot *sl = &ca->slot_info[i];
+
+		if (sl->slot_state == DVB_CA_SLOTSTATE_RUNNING) {
+			if (!sl->rx_buffer.data) {
+				/*
+				 * it is safe to call this here without locks
+				 * because ca->open == 0. Data is not read in
+				 * this case
+				 */
+				dvb_ringbuffer_flush(&sl->rx_buffer);
+			}
+		}
+	}
+
+	ca->open = 1;
+	dvb_ca_en50221_thread_update_delay(ca);
+	dvb_ca_en50221_thread_wakeup(ca);
+
+	dvb_ca_private_get(ca);
+
+	return 0;
+}
+
+/**
+ * Implementation of file close syscall.
+ *
+ * @inode: Inode concerned.
+ * @file: File concerned.
+ *
+ * return: 0 on success, <0 on failure.
+ */
+static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_ca_private *ca = dvbdev->priv;
+	int err;
+
+	dprintk("%s\n", __func__);
+
+	/* mark the CA device as closed */
+	ca->open = 0;
+	dvb_ca_en50221_thread_update_delay(ca);
+
+	err = dvb_generic_release(inode, file);
+
+	module_put(ca->pub->owner);
+
+	dvb_ca_private_put(ca);
+
+	return err;
+}
+
+/**
+ * Implementation of poll() syscall.
+ *
+ * @file: File concerned.
+ * @wait: poll wait table.
+ *
+ * return: Standard poll mask.
+ */
+static __poll_t dvb_ca_en50221_io_poll(struct file *file, poll_table *wait)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_ca_private *ca = dvbdev->priv;
+	__poll_t mask = 0;
+	int slot;
+	int result = 0;
+
+	dprintk("%s\n", __func__);
+
+	if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1)
+		mask |= EPOLLIN;
+
+	/* if there is something, return now */
+	if (mask)
+		return mask;
+
+	/* wait for something to happen */
+	poll_wait(file, &ca->wait_queue, wait);
+
+	if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1)
+		mask |= EPOLLIN;
+
+	return mask;
+}
+
+static const struct file_operations dvb_ca_fops = {
+	.owner = THIS_MODULE,
+	.read = dvb_ca_en50221_io_read,
+	.write = dvb_ca_en50221_io_write,
+	.unlocked_ioctl = dvb_ca_en50221_io_ioctl,
+	.open = dvb_ca_en50221_io_open,
+	.release = dvb_ca_en50221_io_release,
+	.poll = dvb_ca_en50221_io_poll,
+	.llseek = noop_llseek,
+};
+
+static const struct dvb_device dvbdev_ca = {
+	.priv = NULL,
+	.users = 1,
+	.readers = 1,
+	.writers = 1,
+#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
+	.name = "dvb-ca-en50221",
+#endif
+	.fops = &dvb_ca_fops,
+};
+
+/* ************************************************************************** */
+/* Initialisation/shutdown functions */
+
+/**
+ * Initialise a new DVB CA EN50221 interface device.
+ *
+ * @dvb_adapter: DVB adapter to attach the new CA device to.
+ * @pubca: The dvb_ca instance.
+ * @flags: Flags describing the CA device (DVB_CA_FLAG_*).
+ * @slot_count: Number of slots supported.
+ *
+ * return: 0 on success, nonzero on failure
+ */
+int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter,
+			struct dvb_ca_en50221 *pubca, int flags, int slot_count)
+{
+	int ret;
+	struct dvb_ca_private *ca = NULL;
+	int i;
+
+	dprintk("%s\n", __func__);
+
+	if (slot_count < 1)
+		return -EINVAL;
+
+	/* initialise the system data */
+	ca = kzalloc(sizeof(*ca), GFP_KERNEL);
+	if (!ca) {
+		ret = -ENOMEM;
+		goto exit;
+	}
+	kref_init(&ca->refcount);
+	ca->pub = pubca;
+	ca->flags = flags;
+	ca->slot_count = slot_count;
+	ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot),
+				GFP_KERNEL);
+	if (!ca->slot_info) {
+		ret = -ENOMEM;
+		goto free_ca;
+	}
+	init_waitqueue_head(&ca->wait_queue);
+	ca->open = 0;
+	ca->wakeup = 0;
+	ca->next_read_slot = 0;
+	pubca->private = ca;
+
+	/* register the DVB device */
+	ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca,
+				  DVB_DEVICE_CA, 0);
+	if (ret)
+		goto free_slot_info;
+
+	/* now initialise each slot */
+	for (i = 0; i < slot_count; i++) {
+		struct dvb_ca_slot *sl = &ca->slot_info[i];
+
+		memset(sl, 0, sizeof(struct dvb_ca_slot));
+		sl->slot_state = DVB_CA_SLOTSTATE_NONE;
+		atomic_set(&sl->camchange_count, 0);
+		sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
+		mutex_init(&sl->slot_lock);
+	}
+
+	mutex_init(&ca->ioctl_mutex);
+
+	if (signal_pending(current)) {
+		ret = -EINTR;
+		goto unregister_device;
+	}
+	mb();
+
+	/* create a kthread for monitoring this CA device */
+	ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i",
+				 ca->dvbdev->adapter->num, ca->dvbdev->id);
+	if (IS_ERR(ca->thread)) {
+		ret = PTR_ERR(ca->thread);
+		pr_err("dvb_ca_init: failed to start kernel_thread (%d)\n",
+		       ret);
+		goto unregister_device;
+	}
+	return 0;
+
+unregister_device:
+	dvb_unregister_device(ca->dvbdev);
+free_slot_info:
+	kfree(ca->slot_info);
+free_ca:
+	kfree(ca);
+exit:
+	pubca->private = NULL;
+	return ret;
+}
+EXPORT_SYMBOL(dvb_ca_en50221_init);
+
+/**
+ * Release a DVB CA EN50221 interface device.
+ *
+ * @pubca: The associated dvb_ca instance.
+ */
+void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca)
+{
+	struct dvb_ca_private *ca = pubca->private;
+	int i;
+
+	dprintk("%s\n", __func__);
+
+	/* shutdown the thread if there was one */
+	kthread_stop(ca->thread);
+
+	for (i = 0; i < ca->slot_count; i++)
+		dvb_ca_en50221_slot_shutdown(ca, i);
+
+	dvb_remove_device(ca->dvbdev);
+	dvb_ca_private_put(ca);
+	pubca->private = NULL;
+}
+EXPORT_SYMBOL(dvb_ca_en50221_release);
diff --git a/drivers/media/dvb-core/dvb_demux.c b/drivers/media/dvb-core/dvb_demux.c
new file mode 100644
index 000000000..39a2c6ccf
--- /dev/null
+++ b/drivers/media/dvb-core/dvb_demux.c
@@ -0,0 +1,1327 @@
+/*
+ * dvb_demux.c - DVB kernel demux API
+ *
+ * Copyright (C) 2000-2001 Ralph  Metzler <ralph@convergence.de>
+ *		       & Marcus Metzler <marcus@convergence.de>
+ *			 for convergence integrated media GmbH
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#define pr_fmt(fmt) "dvb_demux: " fmt
+
+#include <linux/sched/signal.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/string.h>
+#include <linux/crc32.h>
+#include <linux/uaccess.h>
+#include <asm/div64.h>
+
+#include <media/dvb_demux.h>
+
+static int dvb_demux_tscheck;
+module_param(dvb_demux_tscheck, int, 0644);
+MODULE_PARM_DESC(dvb_demux_tscheck,
+		"enable transport stream continuity and TEI check");
+
+static int dvb_demux_speedcheck;
+module_param(dvb_demux_speedcheck, int, 0644);
+MODULE_PARM_DESC(dvb_demux_speedcheck,
+		"enable transport stream speed check");
+
+static int dvb_demux_feed_err_pkts = 1;
+module_param(dvb_demux_feed_err_pkts, int, 0644);
+MODULE_PARM_DESC(dvb_demux_feed_err_pkts,
+		 "when set to 0, drop packets with the TEI bit set (1 by default)");
+
+#define dprintk(fmt, arg...) \
+	printk(KERN_DEBUG pr_fmt("%s: " fmt),  __func__, ##arg)
+
+#define dprintk_tscheck(x...) do {			\
+	if (dvb_demux_tscheck && printk_ratelimit())	\
+		dprintk(x);				\
+} while (0)
+
+#ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
+#  define dprintk_sect_loss(x...) dprintk(x)
+#else
+#  define dprintk_sect_loss(x...)
+#endif
+
+#define set_buf_flags(__feed, __flag)			\
+	do {						\
+		(__feed)->buffer_flags |= (__flag);	\
+	} while (0)
+
+/******************************************************************************
+ * static inlined helper functions
+ ******************************************************************************/
+
+static inline u16 section_length(const u8 *buf)
+{
+	return 3 + ((buf[1] & 0x0f) << 8) + buf[2];
+}
+
+static inline u16 ts_pid(const u8 *buf)
+{
+	return ((buf[1] & 0x1f) << 8) + buf[2];
+}
+
+static inline u8 payload(const u8 *tsp)
+{
+	if (!(tsp[3] & 0x10))	// no payload?
+		return 0;
+
+	if (tsp[3] & 0x20) {	// adaptation field?
+		if (tsp[4] > 183)	// corrupted data?
+			return 0;
+		else
+			return 184 - 1 - tsp[4];
+	}
+
+	return 184;
+}
+
+static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len)
+{
+	return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len));
+}
+
+static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s,
+			    size_t len)
+{
+	memcpy(d, s, len);
+}
+
+/******************************************************************************
+ * Software filter functions
+ ******************************************************************************/
+
+static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed,
+					   const u8 *buf)
+{
+	int count = payload(buf);
+	int p;
+	int ccok;
+	u8 cc;
+
+	if (count == 0)
+		return -1;
+
+	p = 188 - count;
+
+	cc = buf[3] & 0x0f;
+	ccok = ((feed->cc + 1) & 0x0f) == cc;
+	feed->cc = cc;
+	if (!ccok) {
+		set_buf_flags(feed, DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
+		dprintk_sect_loss("missed packet: %d instead of %d!\n",
+				  cc, (feed->cc + 1) & 0x0f);
+	}
+
+	if (buf[1] & 0x40)	// PUSI ?
+		feed->peslen = 0xfffa;
+
+	feed->peslen += count;
+
+	return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts,
+			   &feed->buffer_flags);
+}
+
+static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed,
+					  struct dvb_demux_filter *f)
+{
+	u8 neq = 0;
+	int i;
+
+	for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
+		u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];
+
+		if (f->maskandmode[i] & xor)
+			return 0;
+
+		neq |= f->maskandnotmode[i] & xor;
+	}
+
+	if (f->doneq && !neq)
+		return 0;
+
+	return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen,
+			    NULL, 0, &f->filter, &feed->buffer_flags);
+}
+
+static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed)
+{
+	struct dvb_demux *demux = feed->demux;
+	struct dvb_demux_filter *f = feed->filter;
+	struct dmx_section_feed *sec = &feed->feed.sec;
+	int section_syntax_indicator;
+
+	if (!sec->is_filtering)
+		return 0;
+
+	if (!f)
+		return 0;
+
+	if (sec->check_crc) {
+		section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);
+		if (section_syntax_indicator &&
+		    demux->check_crc32(feed, sec->secbuf, sec->seclen)) {
+			set_buf_flags(feed, DMX_BUFFER_FLAG_HAD_CRC32_DISCARD);
+			return -1;
+		}
+	}
+
+	do {
+		if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0)
+			return -1;
+	} while ((f = f->next) && sec->is_filtering);
+
+	sec->seclen = 0;
+
+	return 0;
+}
+
+static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)
+{
+	struct dmx_section_feed *sec = &feed->feed.sec;
+
+	if (sec->secbufp < sec->tsfeedp) {
+		int n = sec->tsfeedp - sec->secbufp;
+
+		/*
+		 * Section padding is done with 0xff bytes entirely.
+		 * Due to speed reasons, we won't check all of them
+		 * but just first and last.
+		 */
+		if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) {
+			set_buf_flags(feed,
+				      DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
+			dprintk_sect_loss("section ts padding loss: %d/%d\n",
+					  n, sec->tsfeedp);
+			dprintk_sect_loss("pad data: %*ph\n", n, sec->secbuf);
+		}
+	}
+
+	sec->tsfeedp = sec->secbufp = sec->seclen = 0;
+	sec->secbuf = sec->secbuf_base;
+}
+
+/*
+ * Losless Section Demux 1.4.1 by Emard
+ * Valsecchi Patrick:
+ *  - middle of section A  (no PUSI)
+ *  - end of section A and start of section B
+ *    (with PUSI pointing to the start of the second section)
+ *
+ *  In this case, without feed->pusi_seen you'll receive a garbage section
+ *  consisting of the end of section A. Basically because tsfeedp
+ *  is incemented and the use=0 condition is not raised
+ *  when the second packet arrives.
+ *
+ * Fix:
+ * when demux is started, let feed->pusi_seen = false to
+ * prevent initial feeding of garbage from the end of
+ * previous section. When you for the first time see PUSI=1
+ * then set feed->pusi_seen = true
+ */
+static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed,
+					      const u8 *buf, u8 len)
+{
+	struct dvb_demux *demux = feed->demux;
+	struct dmx_section_feed *sec = &feed->feed.sec;
+	u16 limit, seclen, n;
+
+	if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)
+		return 0;
+
+	if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
+		set_buf_flags(feed, DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
+		dprintk_sect_loss("section buffer full loss: %d/%d\n",
+				  sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE,
+				  DMX_MAX_SECFEED_SIZE);
+		len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
+	}
+
+	if (len <= 0)
+		return 0;
+
+	demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);
+	sec->tsfeedp += len;
+
+	/*
+	 * Dump all the sections we can find in the data (Emard)
+	 */
+	limit = sec->tsfeedp;
+	if (limit > DMX_MAX_SECFEED_SIZE)
+		return -1;	/* internal error should never happen */
+
+	/* to be sure always set secbuf */
+	sec->secbuf = sec->secbuf_base + sec->secbufp;
+
+	for (n = 0; sec->secbufp + 2 < limit; n++) {
+		seclen = section_length(sec->secbuf);
+		if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE
+		    || seclen + sec->secbufp > limit)
+			return 0;
+		sec->seclen = seclen;
+		sec->crc_val = ~0;
+		/* dump [secbuf .. secbuf+seclen) */
+		if (feed->pusi_seen) {
+			dvb_dmx_swfilter_section_feed(feed);
+		} else {
+			set_buf_flags(feed,
+				      DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
+			dprintk_sect_loss("pusi not seen, discarding section data\n");
+		}
+		sec->secbufp += seclen;	/* secbufp and secbuf moving together is */
+		sec->secbuf += seclen;	/* redundant but saves pointer arithmetic */
+	}
+
+	return 0;
+}
+
+static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed,
+					   const u8 *buf)
+{
+	u8 p, count;
+	int ccok, dc_i = 0;
+	u8 cc;
+
+	count = payload(buf);
+
+	if (count == 0)		/* count == 0 if no payload or out of range */
+		return -1;
+
+	p = 188 - count;	/* payload start */
+
+	cc = buf[3] & 0x0f;
+	ccok = ((feed->cc + 1) & 0x0f) == cc;
+	feed->cc = cc;
+
+	if (buf[3] & 0x20) {
+		/* adaption field present, check for discontinuity_indicator */
+		if ((buf[4] > 0) && (buf[5] & 0x80))
+			dc_i = 1;
+	}
+
+	if (!ccok || dc_i) {
+		if (dc_i) {
+			set_buf_flags(feed,
+				      DMX_BUFFER_FLAG_DISCONTINUITY_INDICATOR);
+			dprintk_sect_loss("%d frame with disconnect indicator\n",
+				cc);
+		} else {
+			set_buf_flags(feed,
+				      DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
+			dprintk_sect_loss("discontinuity: %d instead of %d. %d bytes lost\n",
+				cc, (feed->cc + 1) & 0x0f, count + 4);
+		}
+		/*
+		 * those bytes under some circumstances will again be reported
+		 * in the following dvb_dmx_swfilter_section_new
+		 */
+
+		/*
+		 * Discontinuity detected. Reset pusi_seen to
+		 * stop feeding of suspicious data until next PUSI=1 arrives
+		 *
+		 * FIXME: does it make sense if the MPEG-TS is the one
+		 *	reporting discontinuity?
+		 */
+
+		feed->pusi_seen = false;
+		dvb_dmx_swfilter_section_new(feed);
+	}
+
+	if (buf[1] & 0x40) {
+		/* PUSI=1 (is set), section boundary is here */
+		if (count > 1 && buf[p] < count) {
+			const u8 *before = &buf[p + 1];
+			u8 before_len = buf[p];
+			const u8 *after = &before[before_len];
+			u8 after_len = count - 1 - before_len;
+
+			dvb_dmx_swfilter_section_copy_dump(feed, before,
+							   before_len);
+			/* before start of new section, set pusi_seen */
+			feed->pusi_seen = true;
+			dvb_dmx_swfilter_section_new(feed);
+			dvb_dmx_swfilter_section_copy_dump(feed, after,
+							   after_len);
+		} else if (count > 0) {
+			set_buf_flags(feed,
+				      DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
+			dprintk_sect_loss("PUSI=1 but %d bytes lost\n", count);
+		}
+	} else {
+		/* PUSI=0 (is not set), no section boundary */
+		dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count);
+	}
+
+	return 0;
+}
+
+static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed,
+						const u8 *buf)
+{
+	switch (feed->type) {
+	case DMX_TYPE_TS:
+		if (!feed->feed.ts.is_filtering)
+			break;
+		if (feed->ts_type & TS_PACKET) {
+			if (feed->ts_type & TS_PAYLOAD_ONLY)
+				dvb_dmx_swfilter_payload(feed, buf);
+			else
+				feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts,
+					    &feed->buffer_flags);
+		}
+		/* Used only on full-featured devices */
+		if (feed->ts_type & TS_DECODER)
+			if (feed->demux->write_to_decoder)
+				feed->demux->write_to_decoder(feed, buf, 188);
+		break;
+
+	case DMX_TYPE_SEC:
+		if (!feed->feed.sec.is_filtering)
+			break;
+		if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
+			feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;
+		break;
+
+	default:
+		break;
+	}
+}
+
+#define DVR_FEED(f)							\
+	(((f)->type == DMX_TYPE_TS) &&					\
+	((f)->feed.ts.is_filtering) &&					\
+	(((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET))
+
+static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
+{
+	struct dvb_demux_feed *feed;
+	u16 pid = ts_pid(buf);
+	int dvr_done = 0;
+
+	if (dvb_demux_speedcheck) {
+		ktime_t cur_time;
+		u64 speed_bytes, speed_timedelta;
+
+		demux->speed_pkts_cnt++;
+
+		/* show speed every SPEED_PKTS_INTERVAL packets */
+		if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) {
+			cur_time = ktime_get();
+
+			if (ktime_to_ns(demux->speed_last_time) != 0) {
+				speed_bytes = (u64)demux->speed_pkts_cnt
+					* 188 * 8;
+				/* convert to 1024 basis */
+				speed_bytes = 1000 * div64_u64(speed_bytes,
+						1024);
+				speed_timedelta = ktime_ms_delta(cur_time,
+							demux->speed_last_time);
+				if (speed_timedelta)
+					dprintk("TS speed %llu Kbits/sec \n",
+						div64_u64(speed_bytes,
+							  speed_timedelta));
+			}
+
+			demux->speed_last_time = cur_time;
+			demux->speed_pkts_cnt = 0;
+		}
+	}
+
+	if (buf[1] & 0x80) {
+		list_for_each_entry(feed, &demux->feed_list, list_head) {
+			if ((feed->pid != pid) && (feed->pid != 0x2000))
+				continue;
+			set_buf_flags(feed, DMX_BUFFER_FLAG_TEI);
+		}
+		dprintk_tscheck("TEI detected. PID=0x%x data1=0x%x\n",
+				pid, buf[1]);
+		/* data in this packet can't be trusted - drop it unless
+		 * module option dvb_demux_feed_err_pkts is set */
+		if (!dvb_demux_feed_err_pkts)
+			return;
+	} else /* if TEI bit is set, pid may be wrong- skip pkt counter */
+		if (demux->cnt_storage && dvb_demux_tscheck) {
+			/* check pkt counter */
+			if (pid < MAX_PID) {
+				if (buf[3] & 0x10)
+					demux->cnt_storage[pid] =
+						(demux->cnt_storage[pid] + 1) & 0xf;
+
+				if ((buf[3] & 0xf) != demux->cnt_storage[pid]) {
+					list_for_each_entry(feed, &demux->feed_list, list_head) {
+						if ((feed->pid != pid) && (feed->pid != 0x2000))
+							continue;
+						set_buf_flags(feed,
+							      DMX_BUFFER_PKT_COUNTER_MISMATCH);
+					}
+
+					dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n",
+							pid, demux->cnt_storage[pid],
+							buf[3] & 0xf);
+					demux->cnt_storage[pid] = buf[3] & 0xf;
+				}
+			}
+			/* end check */
+		}
+
+	list_for_each_entry(feed, &demux->feed_list, list_head) {
+		if ((feed->pid != pid) && (feed->pid != 0x2000))
+			continue;
+
+		/* copy each packet only once to the dvr device, even
+		 * if a PID is in multiple filters (e.g. video + PCR) */
+		if ((DVR_FEED(feed)) && (dvr_done++))
+			continue;
+
+		if (feed->pid == pid)
+			dvb_dmx_swfilter_packet_type(feed, buf);
+		else if (feed->pid == 0x2000)
+			feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts,
+				    &feed->buffer_flags);
+	}
+}
+
+void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
+			      size_t count)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&demux->lock, flags);
+
+	while (count--) {
+		if (buf[0] == 0x47)
+			dvb_dmx_swfilter_packet(demux, buf);
+		buf += 188;
+	}
+
+	spin_unlock_irqrestore(&demux->lock, flags);
+}
+
+EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
+
+static inline int find_next_packet(const u8 *buf, int pos, size_t count,
+				   const int pktsize)
+{
+	int start = pos, lost;
+
+	while (pos < count) {
+		if (buf[pos] == 0x47 ||
+		    (pktsize == 204 && buf[pos] == 0xB8))
+			break;
+		pos++;
+	}
+
+	lost = pos - start;
+	if (lost) {
+		/* This garbage is part of a valid packet? */
+		int backtrack = pos - pktsize;
+		if (backtrack >= 0 && (buf[backtrack] == 0x47 ||
+		    (pktsize == 204 && buf[backtrack] == 0xB8)))
+			return backtrack;
+	}
+
+	return pos;
+}
+
+/* Filter all pktsize= 188 or 204 sized packets and skip garbage. */
+static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf,
+		size_t count, const int pktsize)
+{
+	int p = 0, i, j;
+	const u8 *q;
+	unsigned long flags;
+
+	spin_lock_irqsave(&demux->lock, flags);
+
+	if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */
+		i = demux->tsbufp;
+		j = pktsize - i;
+		if (count < j) {
+			memcpy(&demux->tsbuf[i], buf, count);
+			demux->tsbufp += count;
+			goto bailout;
+		}
+		memcpy(&demux->tsbuf[i], buf, j);
+		if (demux->tsbuf[0] == 0x47) /* double check */
+			dvb_dmx_swfilter_packet(demux, demux->tsbuf);
+		demux->tsbufp = 0;
+		p += j;
+	}
+
+	while (1) {
+		p = find_next_packet(buf, p, count, pktsize);
+		if (p >= count)
+			break;
+		if (count - p < pktsize)
+			break;
+
+		q = &buf[p];
+
+		if (pktsize == 204 && (*q == 0xB8)) {
+			memcpy(demux->tsbuf, q, 188);
+			demux->tsbuf[0] = 0x47;
+			q = demux->tsbuf;
+		}
+		dvb_dmx_swfilter_packet(demux, q);
+		p += pktsize;
+	}
+
+	i = count - p;
+	if (i) {
+		memcpy(demux->tsbuf, &buf[p], i);
+		demux->tsbufp = i;
+		if (pktsize == 204 && demux->tsbuf[0] == 0xB8)
+			demux->tsbuf[0] = 0x47;
+	}
+
+bailout:
+	spin_unlock_irqrestore(&demux->lock, flags);
+}
+
+void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
+{
+	_dvb_dmx_swfilter(demux, buf, count, 188);
+}
+EXPORT_SYMBOL(dvb_dmx_swfilter);
+
+void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
+{
+	_dvb_dmx_swfilter(demux, buf, count, 204);
+}
+EXPORT_SYMBOL(dvb_dmx_swfilter_204);
+
+void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&demux->lock, flags);
+
+	demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts,
+			   &demux->feed->buffer_flags);
+
+	spin_unlock_irqrestore(&demux->lock, flags);
+}
+EXPORT_SYMBOL(dvb_dmx_swfilter_raw);
+
+static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
+{
+	int i;
+
+	for (i = 0; i < demux->filternum; i++)
+		if (demux->filter[i].state == DMX_STATE_FREE)
+			break;
+
+	if (i == demux->filternum)
+		return NULL;
+
+	demux->filter[i].state = DMX_STATE_ALLOCATED;
+
+	return &demux->filter[i];
+}
+
+static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
+{
+	int i;
+
+	for (i = 0; i < demux->feednum; i++)
+		if (demux->feed[i].state == DMX_STATE_FREE)
+			break;
+
+	if (i == demux->feednum)
+		return NULL;
+
+	demux->feed[i].state = DMX_STATE_ALLOCATED;
+
+	return &demux->feed[i];
+}
+
+static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
+{
+	struct dvb_demux_feed *entry;
+
+	list_for_each_entry(entry, &feed->demux->feed_list, list_head)
+		if (entry == feed)
+			return 1;
+
+	return 0;
+}
+
+static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
+{
+	spin_lock_irq(&feed->demux->lock);
+	if (dvb_demux_feed_find(feed)) {
+		pr_err("%s: feed already in list (type=%x state=%x pid=%x)\n",
+		       __func__, feed->type, feed->state, feed->pid);
+		goto out;
+	}
+
+	list_add(&feed->list_head, &feed->demux->feed_list);
+out:
+	spin_unlock_irq(&feed->demux->lock);
+}
+
+static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
+{
+	spin_lock_irq(&feed->demux->lock);
+	if (!(dvb_demux_feed_find(feed))) {
+		pr_err("%s: feed not in list (type=%x state=%x pid=%x)\n",
+		       __func__, feed->type, feed->state, feed->pid);
+		goto out;
+	}
+
+	list_del(&feed->list_head);
+out:
+	spin_unlock_irq(&feed->demux->lock);
+}
+
+static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
+			   enum dmx_ts_pes pes_type, ktime_t timeout)
+{
+	struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
+	struct dvb_demux *demux = feed->demux;
+
+	if (pid > DMX_MAX_PID)
+		return -EINVAL;
+
+	if (mutex_lock_interruptible(&demux->mutex))
+		return -ERESTARTSYS;
+
+	if (ts_type & TS_DECODER) {
+		if (pes_type >= DMX_PES_OTHER) {
+			mutex_unlock(&demux->mutex);
+			return -EINVAL;
+		}
+
+		if (demux->pesfilter[pes_type] &&
+		    demux->pesfilter[pes_type] != feed) {
+			mutex_unlock(&demux->mutex);
+			return -EINVAL;
+		}
+
+		demux->pesfilter[pes_type] = feed;
+		demux->pids[pes_type] = pid;
+	}
+
+	dvb_demux_feed_add(feed);
+
+	feed->pid = pid;
+	feed->timeout = timeout;
+	feed->ts_type = ts_type;
+	feed->pes_type = pes_type;
+
+	feed->state = DMX_STATE_READY;
+	mutex_unlock(&demux->mutex);
+
+	return 0;
+}
+
+static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
+{
+	struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
+	struct dvb_demux *demux = feed->demux;
+	int ret;
+
+	if (mutex_lock_interruptible(&demux->mutex))
+		return -ERESTARTSYS;
+
+	if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
+		mutex_unlock(&demux->mutex);
+		return -EINVAL;
+	}
+
+	if (!demux->start_feed) {
+		mutex_unlock(&demux->mutex);
+		return -ENODEV;
+	}
+
+	if ((ret = demux->start_feed(feed)) < 0) {
+		mutex_unlock(&demux->mutex);
+		return ret;
+	}
+
+	spin_lock_irq(&demux->lock);
+	ts_feed->is_filtering = 1;
+	feed->state = DMX_STATE_GO;
+	spin_unlock_irq(&demux->lock);
+	mutex_unlock(&demux->mutex);
+
+	return 0;
+}
+
+static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
+{
+	struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
+	struct dvb_demux *demux = feed->demux;
+	int ret;
+
+	mutex_lock(&demux->mutex);
+
+	if (feed->state < DMX_STATE_GO) {
+		mutex_unlock(&demux->mutex);
+		return -EINVAL;
+	}
+
+	if (!demux->stop_feed) {
+		mutex_unlock(&demux->mutex);
+		return -ENODEV;
+	}
+
+	ret = demux->stop_feed(feed);
+
+	spin_lock_irq(&demux->lock);
+	ts_feed->is_filtering = 0;
+	feed->state = DMX_STATE_ALLOCATED;
+	spin_unlock_irq(&demux->lock);
+	mutex_unlock(&demux->mutex);
+
+	return ret;
+}
+
+static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
+				   struct dmx_ts_feed **ts_feed,
+				   dmx_ts_cb callback)
+{
+	struct dvb_demux *demux = (struct dvb_demux *)dmx;
+	struct dvb_demux_feed *feed;
+
+	if (mutex_lock_interruptible(&demux->mutex))
+		return -ERESTARTSYS;
+
+	if (!(feed = dvb_dmx_feed_alloc(demux))) {
+		mutex_unlock(&demux->mutex);
+		return -EBUSY;
+	}
+
+	feed->type = DMX_TYPE_TS;
+	feed->cb.ts = callback;
+	feed->demux = demux;
+	feed->pid = 0xffff;
+	feed->peslen = 0xfffa;
+	feed->buffer_flags = 0;
+
+	(*ts_feed) = &feed->feed.ts;
+	(*ts_feed)->parent = dmx;
+	(*ts_feed)->priv = NULL;
+	(*ts_feed)->is_filtering = 0;
+	(*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
+	(*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
+	(*ts_feed)->set = dmx_ts_feed_set;
+
+	if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
+		feed->state = DMX_STATE_FREE;
+		mutex_unlock(&demux->mutex);
+		return -EBUSY;
+	}
+
+	feed->filter->type = DMX_TYPE_TS;
+	feed->filter->feed = feed;
+	feed->filter->state = DMX_STATE_READY;
+
+	mutex_unlock(&demux->mutex);
+
+	return 0;
+}
+
+static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
+				  struct dmx_ts_feed *ts_feed)
+{
+	struct dvb_demux *demux = (struct dvb_demux *)dmx;
+	struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
+
+	mutex_lock(&demux->mutex);
+
+	if (feed->state == DMX_STATE_FREE) {
+		mutex_unlock(&demux->mutex);
+		return -EINVAL;
+	}
+
+	feed->state = DMX_STATE_FREE;
+	feed->filter->state = DMX_STATE_FREE;
+
+	dvb_demux_feed_del(feed);
+
+	feed->pid = 0xffff;
+
+	if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER)
+		demux->pesfilter[feed->pes_type] = NULL;
+
+	mutex_unlock(&demux->mutex);
+	return 0;
+}
+
+/******************************************************************************
+ * dmx_section_feed API calls
+ ******************************************************************************/
+
+static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
+					    struct dmx_section_filter **filter)
+{
+	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
+	struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
+	struct dvb_demux_filter *dvbdmxfilter;
+
+	if (mutex_lock_interruptible(&dvbdemux->mutex))
+		return -ERESTARTSYS;
+
+	dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
+	if (!dvbdmxfilter) {
+		mutex_unlock(&dvbdemux->mutex);
+		return -EBUSY;
+	}
+
+	spin_lock_irq(&dvbdemux->lock);
+	*filter = &dvbdmxfilter->filter;
+	(*filter)->parent = feed;
+	(*filter)->priv = NULL;
+	dvbdmxfilter->feed = dvbdmxfeed;
+	dvbdmxfilter->type = DMX_TYPE_SEC;
+	dvbdmxfilter->state = DMX_STATE_READY;
+	dvbdmxfilter->next = dvbdmxfeed->filter;
+	dvbdmxfeed->filter = dvbdmxfilter;
+	spin_unlock_irq(&dvbdemux->lock);
+
+	mutex_unlock(&dvbdemux->mutex);
+	return 0;
+}
+
+static int dmx_section_feed_set(struct dmx_section_feed *feed,
+				u16 pid, int check_crc)
+{
+	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
+	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
+
+	if (pid > 0x1fff)
+		return -EINVAL;
+
+	if (mutex_lock_interruptible(&dvbdmx->mutex))
+		return -ERESTARTSYS;
+
+	dvb_demux_feed_add(dvbdmxfeed);
+
+	dvbdmxfeed->pid = pid;
+	dvbdmxfeed->feed.sec.check_crc = check_crc;
+
+	dvbdmxfeed->state = DMX_STATE_READY;
+	mutex_unlock(&dvbdmx->mutex);
+	return 0;
+}
+
+static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
+{
+	int i;
+	struct dvb_demux_filter *f;
+	struct dmx_section_filter *sf;
+	u8 mask, mode, doneq;
+
+	if (!(f = dvbdmxfeed->filter))
+		return;
+	do {
+		sf = &f->filter;
+		doneq = false;
+		for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
+			mode = sf->filter_mode[i];
+			mask = sf->filter_mask[i];
+			f->maskandmode[i] = mask & mode;
+			doneq |= f->maskandnotmode[i] = mask & ~mode;
+		}
+		f->doneq = doneq ? true : false;
+	} while ((f = f->next));
+}
+
+static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
+{
+	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
+	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
+	int ret;
+
+	if (mutex_lock_interruptible(&dvbdmx->mutex))
+		return -ERESTARTSYS;
+
+	if (feed->is_filtering) {
+		mutex_unlock(&dvbdmx->mutex);
+		return -EBUSY;
+	}
+
+	if (!dvbdmxfeed->filter) {
+		mutex_unlock(&dvbdmx->mutex);
+		return -EINVAL;
+	}
+
+	dvbdmxfeed->feed.sec.tsfeedp = 0;
+	dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
+	dvbdmxfeed->feed.sec.secbufp = 0;
+	dvbdmxfeed->feed.sec.seclen = 0;
+
+	if (!dvbdmx->start_feed) {
+		mutex_unlock(&dvbdmx->mutex);
+		return -ENODEV;
+	}
+
+	prepare_secfilters(dvbdmxfeed);
+
+	if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
+		mutex_unlock(&dvbdmx->mutex);
+		return ret;
+	}
+
+	spin_lock_irq(&dvbdmx->lock);
+	feed->is_filtering = 1;
+	dvbdmxfeed->state = DMX_STATE_GO;
+	spin_unlock_irq(&dvbdmx->lock);
+
+	mutex_unlock(&dvbdmx->mutex);
+	return 0;
+}
+
+static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
+{
+	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
+	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
+	int ret;
+
+	mutex_lock(&dvbdmx->mutex);
+
+	if (!dvbdmx->stop_feed) {
+		mutex_unlock(&dvbdmx->mutex);
+		return -ENODEV;
+	}
+
+	ret = dvbdmx->stop_feed(dvbdmxfeed);
+
+	spin_lock_irq(&dvbdmx->lock);
+	dvbdmxfeed->state = DMX_STATE_READY;
+	feed->is_filtering = 0;
+	spin_unlock_irq(&dvbdmx->lock);
+
+	mutex_unlock(&dvbdmx->mutex);
+	return ret;
+}
+
+static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
+					   struct dmx_section_filter *filter)
+{
+	struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
+	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
+	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
+
+	mutex_lock(&dvbdmx->mutex);
+
+	if (dvbdmxfilter->feed != dvbdmxfeed) {
+		mutex_unlock(&dvbdmx->mutex);
+		return -EINVAL;
+	}
+
+	if (feed->is_filtering) {
+		/* release dvbdmx->mutex as far as it is
+		   acquired by stop_filtering() itself */
+		mutex_unlock(&dvbdmx->mutex);
+		feed->stop_filtering(feed);
+		mutex_lock(&dvbdmx->mutex);
+	}
+
+	spin_lock_irq(&dvbdmx->lock);
+	f = dvbdmxfeed->filter;
+
+	if (f == dvbdmxfilter) {
+		dvbdmxfeed->filter = dvbdmxfilter->next;
+	} else {
+		while (f->next != dvbdmxfilter)
+			f = f->next;
+		f->next = f->next->next;
+	}
+
+	dvbdmxfilter->state = DMX_STATE_FREE;
+	spin_unlock_irq(&dvbdmx->lock);
+	mutex_unlock(&dvbdmx->mutex);
+	return 0;
+}
+
+static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
+					struct dmx_section_feed **feed,
+					dmx_section_cb callback)
+{
+	struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
+	struct dvb_demux_feed *dvbdmxfeed;
+
+	if (mutex_lock_interruptible(&dvbdmx->mutex))
+		return -ERESTARTSYS;
+
+	if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
+		mutex_unlock(&dvbdmx->mutex);
+		return -EBUSY;
+	}
+
+	dvbdmxfeed->type = DMX_TYPE_SEC;
+	dvbdmxfeed->cb.sec = callback;
+	dvbdmxfeed->demux = dvbdmx;
+	dvbdmxfeed->pid = 0xffff;
+	dvbdmxfeed->buffer_flags = 0;
+	dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
+	dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
+	dvbdmxfeed->feed.sec.tsfeedp = 0;
+	dvbdmxfeed->filter = NULL;
+
+	(*feed) = &dvbdmxfeed->feed.sec;
+	(*feed)->is_filtering = 0;
+	(*feed)->parent = demux;
+	(*feed)->priv = NULL;
+
+	(*feed)->set = dmx_section_feed_set;
+	(*feed)->allocate_filter = dmx_section_feed_allocate_filter;
+	(*feed)->start_filtering = dmx_section_feed_start_filtering;
+	(*feed)->stop_filtering = dmx_section_feed_stop_filtering;
+	(*feed)->release_filter = dmx_section_feed_release_filter;
+
+	mutex_unlock(&dvbdmx->mutex);
+	return 0;
+}
+
+static int dvbdmx_release_section_feed(struct dmx_demux *demux,
+				       struct dmx_section_feed *feed)
+{
+	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
+	struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
+
+	mutex_lock(&dvbdmx->mutex);
+
+	if (dvbdmxfeed->state == DMX_STATE_FREE) {
+		mutex_unlock(&dvbdmx->mutex);
+		return -EINVAL;
+	}
+	dvbdmxfeed->state = DMX_STATE_FREE;
+
+	dvb_demux_feed_del(dvbdmxfeed);
+
+	dvbdmxfeed->pid = 0xffff;
+
+	mutex_unlock(&dvbdmx->mutex);
+	return 0;
+}
+
+/******************************************************************************
+ * dvb_demux kernel data API calls
+ ******************************************************************************/
+
+static int dvbdmx_open(struct dmx_demux *demux)
+{
+	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
+
+	if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
+		return -EUSERS;
+
+	dvbdemux->users++;
+	return 0;
+}
+
+static int dvbdmx_close(struct dmx_demux *demux)
+{
+	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
+
+	if (dvbdemux->users == 0)
+		return -ENODEV;
+
+	dvbdemux->users--;
+	//FIXME: release any unneeded resources if users==0
+	return 0;
+}
+
+static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
+{
+	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
+	void *p;
+
+	if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
+		return -EINVAL;
+
+	p = memdup_user(buf, count);
+	if (IS_ERR(p))
+		return PTR_ERR(p);
+	if (mutex_lock_interruptible(&dvbdemux->mutex)) {
+		kfree(p);
+		return -ERESTARTSYS;
+	}
+	dvb_dmx_swfilter(dvbdemux, p, count);
+	kfree(p);
+	mutex_unlock(&dvbdemux->mutex);
+
+	if (signal_pending(current))
+		return -EINTR;
+	return count;
+}
+
+static int dvbdmx_add_frontend(struct dmx_demux *demux,
+			       struct dmx_frontend *frontend)
+{
+	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
+	struct list_head *head = &dvbdemux->frontend_list;
+
+	list_add(&(frontend->connectivity_list), head);
+
+	return 0;
+}
+
+static int dvbdmx_remove_frontend(struct dmx_demux *demux,
+				  struct dmx_frontend *frontend)
+{
+	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
+	struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
+
+	list_for_each_safe(pos, n, head) {
+		if (DMX_FE_ENTRY(pos) == frontend) {
+			list_del(pos);
+			return 0;
+		}
+	}
+
+	return -ENODEV;
+}
+
+static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
+{
+	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
+
+	if (list_empty(&dvbdemux->frontend_list))
+		return NULL;
+
+	return &dvbdemux->frontend_list;
+}
+
+static int dvbdmx_connect_frontend(struct dmx_demux *demux,
+				   struct dmx_frontend *frontend)
+{
+	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
+
+	if (demux->frontend)
+		return -EINVAL;
+
+	mutex_lock(&dvbdemux->mutex);
+
+	demux->frontend = frontend;
+	mutex_unlock(&dvbdemux->mutex);
+	return 0;
+}
+
+static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
+{
+	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
+
+	mutex_lock(&dvbdemux->mutex);
+
+	demux->frontend = NULL;
+	mutex_unlock(&dvbdemux->mutex);
+	return 0;
+}
+
+static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
+{
+	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
+
+	memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
+	return 0;
+}
+
+int dvb_dmx_init(struct dvb_demux *dvbdemux)
+{
+	int i;
+	struct dmx_demux *dmx = &dvbdemux->dmx;
+
+	dvbdemux->cnt_storage = NULL;
+	dvbdemux->users = 0;
+	dvbdemux->filter = vmalloc(array_size(sizeof(struct dvb_demux_filter),
+					      dvbdemux->filternum));
+
+	if (!dvbdemux->filter)
+		return -ENOMEM;
+
+	dvbdemux->feed = vmalloc(array_size(sizeof(struct dvb_demux_feed),
+					    dvbdemux->feednum));
+	if (!dvbdemux->feed) {
+		vfree(dvbdemux->filter);
+		dvbdemux->filter = NULL;
+		return -ENOMEM;
+	}
+	for (i = 0; i < dvbdemux->filternum; i++) {
+		dvbdemux->filter[i].state = DMX_STATE_FREE;
+		dvbdemux->filter[i].index = i;
+	}
+	for (i = 0; i < dvbdemux->feednum; i++) {
+		dvbdemux->feed[i].state = DMX_STATE_FREE;
+		dvbdemux->feed[i].index = i;
+	}
+
+	dvbdemux->cnt_storage = vmalloc(MAX_PID + 1);
+	if (!dvbdemux->cnt_storage)
+		pr_warn("Couldn't allocate memory for TS/TEI check. Disabling it\n");
+
+	INIT_LIST_HEAD(&dvbdemux->frontend_list);
+
+	for (i = 0; i < DMX_PES_OTHER; i++) {
+		dvbdemux->pesfilter[i] = NULL;
+		dvbdemux->pids[i] = 0xffff;
+	}
+
+	INIT_LIST_HEAD(&dvbdemux->feed_list);
+
+	dvbdemux->playing = 0;
+	dvbdemux->recording = 0;
+	dvbdemux->tsbufp = 0;
+
+	if (!dvbdemux->check_crc32)
+		dvbdemux->check_crc32 = dvb_dmx_crc32;
+
+	if (!dvbdemux->memcopy)
+		dvbdemux->memcopy = dvb_dmx_memcopy;
+
+	dmx->frontend = NULL;
+	dmx->priv = dvbdemux;
+	dmx->open = dvbdmx_open;
+	dmx->close = dvbdmx_close;
+	dmx->write = dvbdmx_write;
+	dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
+	dmx->release_ts_feed = dvbdmx_release_ts_feed;
+	dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
+	dmx->release_section_feed = dvbdmx_release_section_feed;
+
+	dmx->add_frontend = dvbdmx_add_frontend;
+	dmx->remove_frontend = dvbdmx_remove_frontend;
+	dmx->get_frontends = dvbdmx_get_frontends;
+	dmx->connect_frontend = dvbdmx_connect_frontend;
+	dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
+	dmx->get_pes_pids = dvbdmx_get_pes_pids;
+
+	mutex_init(&dvbdemux->mutex);
+	spin_lock_init(&dvbdemux->lock);
+
+	return 0;
+}
+
+EXPORT_SYMBOL(dvb_dmx_init);
+
+void dvb_dmx_release(struct dvb_demux *dvbdemux)
+{
+	vfree(dvbdemux->cnt_storage);
+	vfree(dvbdemux->filter);
+	vfree(dvbdemux->feed);
+}
+
+EXPORT_SYMBOL(dvb_dmx_release);
diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
new file mode 100644
index 000000000..8a61150ee
--- /dev/null
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -0,0 +1,3043 @@
+/*
+ * dvb_frontend.c: DVB frontend tuning interface/thread
+ *
+ *
+ * Copyright (C) 1999-2001 Ralph  Metzler
+ *			   Marcus Metzler
+ *			   Holger Waechtler
+ *				      for convergence integrated media GmbH
+ *
+ * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ * To obtain the license, point your browser to
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/* Enables DVBv3 compatibility bits at the headers */
+#define __DVB_CORE__
+
+#define pr_fmt(fmt) "dvb_frontend: " fmt
+
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/sched/signal.h>
+#include <linux/wait.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/semaphore.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/freezer.h>
+#include <linux/jiffies.h>
+#include <linux/kthread.h>
+#include <linux/ktime.h>
+#include <linux/compat.h>
+#include <asm/processor.h>
+
+#include <media/dvb_frontend.h>
+#include <media/dvbdev.h>
+#include <linux/dvb/version.h>
+
+static int dvb_frontend_debug;
+static int dvb_shutdown_timeout;
+static int dvb_force_auto_inversion;
+static int dvb_override_tune_delay;
+static int dvb_powerdown_on_sleep = 1;
+static int dvb_mfe_wait_time = 5;
+
+module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
+MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
+module_param(dvb_shutdown_timeout, int, 0644);
+MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
+module_param(dvb_force_auto_inversion, int, 0644);
+MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
+module_param(dvb_override_tune_delay, int, 0644);
+MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
+module_param(dvb_powerdown_on_sleep, int, 0644);
+MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
+module_param(dvb_mfe_wait_time, int, 0644);
+MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)");
+
+#define dprintk(fmt, arg...) \
+	printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)
+
+#define FESTATE_IDLE 1
+#define FESTATE_RETUNE 2
+#define FESTATE_TUNING_FAST 4
+#define FESTATE_TUNING_SLOW 8
+#define FESTATE_TUNED 16
+#define FESTATE_ZIGZAG_FAST 32
+#define FESTATE_ZIGZAG_SLOW 64
+#define FESTATE_DISEQC 128
+#define FESTATE_ERROR 256
+#define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
+#define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
+#define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
+#define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
+
+/*
+ * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
+ * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
+ * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
+ * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
+ * FESTATE_TUNED. The frontend has successfully locked on.
+ * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
+ * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
+ * FESTATE_DISEQC. A DISEQC command has just been issued.
+ * FESTATE_WAITFORLOCK. When we're waiting for a lock.
+ * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
+ * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
+ * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
+ */
+
+static DEFINE_MUTEX(frontend_mutex);
+
+struct dvb_frontend_private {
+	/* thread/frontend values */
+	struct dvb_device *dvbdev;
+	struct dvb_frontend_parameters parameters_out;
+	struct dvb_fe_events events;
+	struct semaphore sem;
+	struct list_head list_head;
+	wait_queue_head_t wait_queue;
+	struct task_struct *thread;
+	unsigned long release_jiffies;
+	unsigned int wakeup;
+	enum fe_status status;
+	unsigned long tune_mode_flags;
+	unsigned int delay;
+	unsigned int reinitialise;
+	int tone;
+	int voltage;
+
+	/* swzigzag values */
+	unsigned int state;
+	unsigned int bending;
+	int lnb_drift;
+	unsigned int inversion;
+	unsigned int auto_step;
+	unsigned int auto_sub_step;
+	unsigned int started_auto_step;
+	unsigned int min_delay;
+	unsigned int max_drift;
+	unsigned int step_size;
+	int quality;
+	unsigned int check_wrapped;
+	enum dvbfe_search algo_status;
+
+#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
+	struct media_pipeline pipe;
+#endif
+};
+
+static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
+					void (*release)(struct dvb_frontend *fe));
+
+static void __dvb_frontend_free(struct dvb_frontend *fe)
+{
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+
+	if (fepriv)
+		dvb_free_device(fepriv->dvbdev);
+
+	dvb_frontend_invoke_release(fe, fe->ops.release);
+
+	kfree(fepriv);
+}
+
+static void dvb_frontend_free(struct kref *ref)
+{
+	struct dvb_frontend *fe =
+		container_of(ref, struct dvb_frontend, refcount);
+
+	__dvb_frontend_free(fe);
+}
+
+static void dvb_frontend_put(struct dvb_frontend *fe)
+{
+	/* call detach before dropping the reference count */
+	if (fe->ops.detach)
+		fe->ops.detach(fe);
+	/*
+	 * Check if the frontend was registered, as otherwise
+	 * kref was not initialized yet.
+	 */
+	if (fe->frontend_priv)
+		kref_put(&fe->refcount, dvb_frontend_free);
+	else
+		__dvb_frontend_free(fe);
+}
+
+static void dvb_frontend_get(struct dvb_frontend *fe)
+{
+	kref_get(&fe->refcount);
+}
+
+static void dvb_frontend_wakeup(struct dvb_frontend *fe);
+static int dtv_get_frontend(struct dvb_frontend *fe,
+			    struct dtv_frontend_properties *c,
+			    struct dvb_frontend_parameters *p_out);
+static int
+dtv_property_legacy_params_sync(struct dvb_frontend *fe,
+				const struct dtv_frontend_properties *c,
+				struct dvb_frontend_parameters *p);
+
+static bool has_get_frontend(struct dvb_frontend *fe)
+{
+	return fe->ops.get_frontend;
+}
+
+/*
+ * Due to DVBv3 API calls, a delivery system should be mapped into one of
+ * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
+ * otherwise, a DVBv3 call will fail.
+ */
+enum dvbv3_emulation_type {
+	DVBV3_UNKNOWN,
+	DVBV3_QPSK,
+	DVBV3_QAM,
+	DVBV3_OFDM,
+	DVBV3_ATSC,
+};
+
+static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
+{
+	switch (delivery_system) {
+	case SYS_DVBC_ANNEX_A:
+	case SYS_DVBC_ANNEX_C:
+		return DVBV3_QAM;
+	case SYS_DVBS:
+	case SYS_DVBS2:
+	case SYS_TURBO:
+	case SYS_ISDBS:
+	case SYS_DSS:
+		return DVBV3_QPSK;
+	case SYS_DVBT:
+	case SYS_DVBT2:
+	case SYS_ISDBT:
+	case SYS_DTMB:
+		return DVBV3_OFDM;
+	case SYS_ATSC:
+	case SYS_ATSCMH:
+	case SYS_DVBC_ANNEX_B:
+		return DVBV3_ATSC;
+	case SYS_UNDEFINED:
+	case SYS_ISDBC:
+	case SYS_DVBH:
+	case SYS_DAB:
+	default:
+		/*
+		 * Doesn't know how to emulate those types and/or
+		 * there's no frontend driver from this type yet
+		 * with some emulation code, so, we're not sure yet how
+		 * to handle them, or they're not compatible with a DVBv3 call.
+		 */
+		return DVBV3_UNKNOWN;
+	}
+}
+
+static void dvb_frontend_add_event(struct dvb_frontend *fe,
+				   enum fe_status status)
+{
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+	struct dvb_fe_events *events = &fepriv->events;
+	struct dvb_frontend_event *e;
+	int wp;
+
+	dev_dbg(fe->dvb->device, "%s:\n", __func__);
+
+	if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
+		dtv_get_frontend(fe, c, &fepriv->parameters_out);
+
+	mutex_lock(&events->mtx);
+
+	wp = (events->eventw + 1) % MAX_EVENT;
+	if (wp == events->eventr) {
+		events->overflow = 1;
+		events->eventr = (events->eventr + 1) % MAX_EVENT;
+	}
+
+	e = &events->events[events->eventw];
+	e->status = status;
+	e->parameters = fepriv->parameters_out;
+
+	events->eventw = wp;
+
+	mutex_unlock(&events->mtx);
+
+	wake_up_interruptible(&events->wait_queue);
+}
+
+static int dvb_frontend_test_event(struct dvb_frontend_private *fepriv,
+				   struct dvb_fe_events *events)
+{
+	int ret;
+
+	up(&fepriv->sem);
+	ret = events->eventw != events->eventr;
+	down(&fepriv->sem);
+
+	return ret;
+}
+
+static int dvb_frontend_get_event(struct dvb_frontend *fe,
+				  struct dvb_frontend_event *event, int flags)
+{
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+	struct dvb_fe_events *events = &fepriv->events;
+
+	dev_dbg(fe->dvb->device, "%s:\n", __func__);
+
+	if (events->overflow) {
+		events->overflow = 0;
+		return -EOVERFLOW;
+	}
+
+	if (events->eventw == events->eventr) {
+		int ret;
+
+		if (flags & O_NONBLOCK)
+			return -EWOULDBLOCK;
+
+		ret = wait_event_interruptible(events->wait_queue,
+					       dvb_frontend_test_event(fepriv, events));
+
+		if (ret < 0)
+			return ret;
+	}
+
+	mutex_lock(&events->mtx);
+	*event = events->events[events->eventr];
+	events->eventr = (events->eventr + 1) % MAX_EVENT;
+	mutex_unlock(&events->mtx);
+
+	return 0;
+}
+
+static void dvb_frontend_clear_events(struct dvb_frontend *fe)
+{
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+	struct dvb_fe_events *events = &fepriv->events;
+
+	mutex_lock(&events->mtx);
+	events->eventr = events->eventw;
+	mutex_unlock(&events->mtx);
+}
+
+static void dvb_frontend_init(struct dvb_frontend *fe)
+{
+	dev_dbg(fe->dvb->device,
+		"%s: initialising adapter %i frontend %i (%s)...\n",
+		__func__, fe->dvb->num, fe->id, fe->ops.info.name);
+
+	if (fe->ops.init)
+		fe->ops.init(fe);
+	if (fe->ops.tuner_ops.init) {
+		if (fe->ops.i2c_gate_ctrl)
+			fe->ops.i2c_gate_ctrl(fe, 1);
+		fe->ops.tuner_ops.init(fe);
+		if (fe->ops.i2c_gate_ctrl)
+			fe->ops.i2c_gate_ctrl(fe, 0);
+	}
+}
+
+void dvb_frontend_reinitialise(struct dvb_frontend *fe)
+{
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+
+	fepriv->reinitialise = 1;
+	dvb_frontend_wakeup(fe);
+}
+EXPORT_SYMBOL(dvb_frontend_reinitialise);
+
+static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
+{
+	int q2;
+	struct dvb_frontend *fe = fepriv->dvbdev->priv;
+
+	dev_dbg(fe->dvb->device, "%s:\n", __func__);
+
+	if (locked)
+		(fepriv->quality) = (fepriv->quality * 220 + 36 * 256) / 256;
+	else
+		(fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
+
+	q2 = fepriv->quality - 128;
+	q2 *= q2;
+
+	fepriv->delay = fepriv->min_delay + q2 * HZ / (128 * 128);
+}
+
+/**
+ * dvb_frontend_swzigzag_autotune - Performs automatic twiddling of frontend
+ *	parameters.
+ *
+ * @fe: The frontend concerned.
+ * @check_wrapped: Checks if an iteration has completed.
+ *		   DO NOT SET ON THE FIRST ATTEMPT.
+ *
+ * return: Number of complete iterations that have been performed.
+ */
+static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
+{
+	int autoinversion;
+	int ready = 0;
+	int fe_set_err = 0;
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
+	int original_inversion = c->inversion;
+	u32 original_frequency = c->frequency;
+
+	/* are we using autoinversion? */
+	autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
+			 (c->inversion == INVERSION_AUTO));
+
+	/* setup parameters correctly */
+	while (!ready) {
+		/* calculate the lnb_drift */
+		fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
+
+		/* wrap the auto_step if we've exceeded the maximum drift */
+		if (fepriv->lnb_drift > fepriv->max_drift) {
+			fepriv->auto_step = 0;
+			fepriv->auto_sub_step = 0;
+			fepriv->lnb_drift = 0;
+		}
+
+		/* perform inversion and +/- zigzag */
+		switch (fepriv->auto_sub_step) {
+		case 0:
+			/* try with the current inversion and current drift setting */
+			ready = 1;
+			break;
+
+		case 1:
+			if (!autoinversion) break;
+
+			fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
+			ready = 1;
+			break;
+
+		case 2:
+			if (fepriv->lnb_drift == 0) break;
+
+			fepriv->lnb_drift = -fepriv->lnb_drift;
+			ready = 1;
+			break;
+
+		case 3:
+			if (fepriv->lnb_drift == 0) break;
+			if (!autoinversion) break;
+
+			fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
+			fepriv->lnb_drift = -fepriv->lnb_drift;
+			ready = 1;
+			break;
+
+		default:
+			fepriv->auto_step++;
+			fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
+			break;
+		}
+
+		if (!ready) fepriv->auto_sub_step++;
+	}
+
+	/* if this attempt would hit where we started, indicate a complete
+	 * iteration has occurred */
+	if ((fepriv->auto_step == fepriv->started_auto_step) &&
+	    (fepriv->auto_sub_step == 0) && check_wrapped) {
+		return 1;
+	}
+
+	dev_dbg(fe->dvb->device,
+		"%s: drift:%i inversion:%i auto_step:%i auto_sub_step:%i started_auto_step:%i\n",
+		__func__, fepriv->lnb_drift, fepriv->inversion,
+		fepriv->auto_step, fepriv->auto_sub_step,
+		fepriv->started_auto_step);
+
+	/* set the frontend itself */
+	c->frequency += fepriv->lnb_drift;
+	if (autoinversion)
+		c->inversion = fepriv->inversion;
+	tmp = *c;
+	if (fe->ops.set_frontend)
+		fe_set_err = fe->ops.set_frontend(fe);
+	*c = tmp;
+	if (fe_set_err < 0) {
+		fepriv->state = FESTATE_ERROR;
+		return fe_set_err;
+	}
+
+	c->frequency = original_frequency;
+	c->inversion = original_inversion;
+
+	fepriv->auto_sub_step++;
+	return 0;
+}
+
+static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
+{
+	enum fe_status s = FE_NONE;
+	int retval = 0;
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
+
+	/* if we've got no parameters, just keep idling */
+	if (fepriv->state & FESTATE_IDLE) {
+		fepriv->delay = 3 * HZ;
+		fepriv->quality = 0;
+		return;
+	}
+
+	/* in SCAN mode, we just set the frontend when asked and leave it alone */
+	if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
+		if (fepriv->state & FESTATE_RETUNE) {
+			tmp = *c;
+			if (fe->ops.set_frontend)
+				retval = fe->ops.set_frontend(fe);
+			*c = tmp;
+			if (retval < 0)
+				fepriv->state = FESTATE_ERROR;
+			else
+				fepriv->state = FESTATE_TUNED;
+		}
+		fepriv->delay = 3 * HZ;
+		fepriv->quality = 0;
+		return;
+	}
+
+	/* get the frontend status */
+	if (fepriv->state & FESTATE_RETUNE) {
+		s = 0;
+	} else {
+		if (fe->ops.read_status)
+			fe->ops.read_status(fe, &s);
+		if (s != fepriv->status) {
+			dvb_frontend_add_event(fe, s);
+			fepriv->status = s;
+		}
+	}
+
+	/* if we're not tuned, and we have a lock, move to the TUNED state */
+	if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
+		dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
+		fepriv->state = FESTATE_TUNED;
+
+		/* if we're tuned, then we have determined the correct inversion */
+		if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
+		    (c->inversion == INVERSION_AUTO)) {
+			c->inversion = fepriv->inversion;
+		}
+		return;
+	}
+
+	/* if we are tuned already, check we're still locked */
+	if (fepriv->state & FESTATE_TUNED) {
+		dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
+
+		/* we're tuned, and the lock is still good... */
+		if (s & FE_HAS_LOCK) {
+			return;
+		} else { /* if we _WERE_ tuned, but now don't have a lock */
+			fepriv->state = FESTATE_ZIGZAG_FAST;
+			fepriv->started_auto_step = fepriv->auto_step;
+			fepriv->check_wrapped = 0;
+		}
+	}
+
+	/* don't actually do anything if we're in the LOSTLOCK state,
+	 * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
+	if ((fepriv->state & FESTATE_LOSTLOCK) &&
+	    (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
+		dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
+		return;
+	}
+
+	/* don't do anything if we're in the DISEQC state, since this
+	 * might be someone with a motorized dish controlled by DISEQC.
+	 * If its actually a re-tune, there will be a SET_FRONTEND soon enough.	*/
+	if (fepriv->state & FESTATE_DISEQC) {
+		dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
+		return;
+	}
+
+	/* if we're in the RETUNE state, set everything up for a brand
+	 * new scan, keeping the current inversion setting, as the next
+	 * tune is _very_ likely to require the same */
+	if (fepriv->state & FESTATE_RETUNE) {
+		fepriv->lnb_drift = 0;
+		fepriv->auto_step = 0;
+		fepriv->auto_sub_step = 0;
+		fepriv->started_auto_step = 0;
+		fepriv->check_wrapped = 0;
+	}
+
+	/* fast zigzag. */
+	if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
+		fepriv->delay = fepriv->min_delay;
+
+		/* perform a tune */
+		retval = dvb_frontend_swzigzag_autotune(fe,
+							fepriv->check_wrapped);
+		if (retval < 0) {
+			return;
+		} else if (retval) {
+			/* OK, if we've run out of trials at the fast speed.
+			 * Drop back to slow for the _next_ attempt */
+			fepriv->state = FESTATE_SEARCHING_SLOW;
+			fepriv->started_auto_step = fepriv->auto_step;
+			return;
+		}
+		fepriv->check_wrapped = 1;
+
+		/* if we've just re-tuned, enter the ZIGZAG_FAST state.
+		 * This ensures we cannot return from an
+		 * FE_SET_FRONTEND ioctl before the first frontend tune
+		 * occurs */
+		if (fepriv->state & FESTATE_RETUNE) {
+			fepriv->state = FESTATE_TUNING_FAST;
+		}
+	}
+
+	/* slow zigzag */
+	if (fepriv->state & FESTATE_SEARCHING_SLOW) {
+		dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
+
+		/* Note: don't bother checking for wrapping; we stay in this
+		 * state until we get a lock */
+		dvb_frontend_swzigzag_autotune(fe, 0);
+	}
+}
+
+static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
+{
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+
+	if (fe->exit != DVB_FE_NO_EXIT)
+		return 1;
+
+	if (fepriv->dvbdev->writers == 1)
+		if (time_after_eq(jiffies, fepriv->release_jiffies +
+				  dvb_shutdown_timeout * HZ))
+			return 1;
+
+	return 0;
+}
+
+static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
+{
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+
+	if (fepriv->wakeup) {
+		fepriv->wakeup = 0;
+		return 1;
+	}
+	return dvb_frontend_is_exiting(fe);
+}
+
+static void dvb_frontend_wakeup(struct dvb_frontend *fe)
+{
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+
+	fepriv->wakeup = 1;
+	wake_up_interruptible(&fepriv->wait_queue);
+}
+
+static int dvb_frontend_thread(void *data)
+{
+	struct dvb_frontend *fe = data;
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+	enum fe_status s = FE_NONE;
+	enum dvbfe_algo algo;
+	bool re_tune = false;
+	bool semheld = false;
+
+	dev_dbg(fe->dvb->device, "%s:\n", __func__);
+
+	fepriv->check_wrapped = 0;
+	fepriv->quality = 0;
+	fepriv->delay = 3 * HZ;
+	fepriv->status = 0;
+	fepriv->wakeup = 0;
+	fepriv->reinitialise = 0;
+
+	dvb_frontend_init(fe);
+
+	set_freezable();
+	while (1) {
+		up(&fepriv->sem);	    /* is locked when we enter the thread... */
+restart:
+		wait_event_interruptible_timeout(fepriv->wait_queue,
+						 dvb_frontend_should_wakeup(fe) ||
+						 kthread_should_stop() ||
+						 freezing(current),
+			fepriv->delay);
+
+		if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
+			/* got signal or quitting */
+			if (!down_interruptible(&fepriv->sem))
+				semheld = true;
+			fe->exit = DVB_FE_NORMAL_EXIT;
+			break;
+		}
+
+		if (try_to_freeze())
+			goto restart;
+
+		if (down_interruptible(&fepriv->sem))
+			break;
+
+		if (fepriv->reinitialise) {
+			dvb_frontend_init(fe);
+			if (fe->ops.set_tone && fepriv->tone != -1)
+				fe->ops.set_tone(fe, fepriv->tone);
+			if (fe->ops.set_voltage && fepriv->voltage != -1)
+				fe->ops.set_voltage(fe, fepriv->voltage);
+			fepriv->reinitialise = 0;
+		}
+
+		/* do an iteration of the tuning loop */
+		if (fe->ops.get_frontend_algo) {
+			algo = fe->ops.get_frontend_algo(fe);
+			switch (algo) {
+			case DVBFE_ALGO_HW:
+				dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
+
+				if (fepriv->state & FESTATE_RETUNE) {
+					dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
+					re_tune = true;
+					fepriv->state = FESTATE_TUNED;
+				} else {
+					re_tune = false;
+				}
+
+				if (fe->ops.tune)
+					fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
+
+				if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
+					dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
+					dvb_frontend_add_event(fe, s);
+					fepriv->status = s;
+				}
+				break;
+			case DVBFE_ALGO_SW:
+				dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
+				dvb_frontend_swzigzag(fe);
+				break;
+			case DVBFE_ALGO_CUSTOM:
+				dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
+				if (fepriv->state & FESTATE_RETUNE) {
+					dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
+					fepriv->state = FESTATE_TUNED;
+				}
+				/* Case where we are going to search for a carrier
+				 * User asked us to retune again for some reason, possibly
+				 * requesting a search with a new set of parameters
+				 */
+				if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
+					if (fe->ops.search) {
+						fepriv->algo_status = fe->ops.search(fe);
+						/* We did do a search as was requested, the flags are
+						 * now unset as well and has the flags wrt to search.
+						 */
+					} else {
+						fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
+					}
+				}
+				/* Track the carrier if the search was successful */
+				if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
+					fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
+					fepriv->delay = HZ / 2;
+				}
+				dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
+				fe->ops.read_status(fe, &s);
+				if (s != fepriv->status) {
+					dvb_frontend_add_event(fe, s); /* update event list */
+					fepriv->status = s;
+					if (!(s & FE_HAS_LOCK)) {
+						fepriv->delay = HZ / 10;
+						fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
+					} else {
+						fepriv->delay = 60 * HZ;
+					}
+				}
+				break;
+			default:
+				dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
+				break;
+			}
+		} else {
+			dvb_frontend_swzigzag(fe);
+		}
+	}
+
+	if (dvb_powerdown_on_sleep) {
+		if (fe->ops.set_voltage)
+			fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
+		if (fe->ops.tuner_ops.sleep) {
+			if (fe->ops.i2c_gate_ctrl)
+				fe->ops.i2c_gate_ctrl(fe, 1);
+			fe->ops.tuner_ops.sleep(fe);
+			if (fe->ops.i2c_gate_ctrl)
+				fe->ops.i2c_gate_ctrl(fe, 0);
+		}
+		if (fe->ops.sleep)
+			fe->ops.sleep(fe);
+	}
+
+	fepriv->thread = NULL;
+	if (kthread_should_stop())
+		fe->exit = DVB_FE_DEVICE_REMOVED;
+	else
+		fe->exit = DVB_FE_NO_EXIT;
+	mb();
+
+	if (semheld)
+		up(&fepriv->sem);
+	dvb_frontend_wakeup(fe);
+	return 0;
+}
+
+static void dvb_frontend_stop(struct dvb_frontend *fe)
+{
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+
+	dev_dbg(fe->dvb->device, "%s:\n", __func__);
+
+	if (fe->exit != DVB_FE_DEVICE_REMOVED)
+		fe->exit = DVB_FE_NORMAL_EXIT;
+	mb();
+
+	if (!fepriv->thread)
+		return;
+
+	kthread_stop(fepriv->thread);
+
+	sema_init(&fepriv->sem, 1);
+	fepriv->state = FESTATE_IDLE;
+
+	/* paranoia check in case a signal arrived */
+	if (fepriv->thread)
+		dev_warn(fe->dvb->device,
+			 "dvb_frontend_stop: warning: thread %p won't exit\n",
+			 fepriv->thread);
+}
+
+/*
+ * Sleep for the amount of time given by add_usec parameter
+ *
+ * This needs to be as precise as possible, as it affects the detection of
+ * the dish tone command at the satellite subsystem. The precision is improved
+ * by using a scheduled msleep followed by udelay for the remainder.
+ */
+void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
+{
+	s32 delta;
+
+	*waketime = ktime_add_us(*waketime, add_usec);
+	delta = ktime_us_delta(ktime_get_boottime(), *waketime);
+	if (delta > 2500) {
+		msleep((delta - 1500) / 1000);
+		delta = ktime_us_delta(ktime_get_boottime(), *waketime);
+	}
+	if (delta > 0)
+		udelay(delta);
+}
+EXPORT_SYMBOL(dvb_frontend_sleep_until);
+
+static int dvb_frontend_start(struct dvb_frontend *fe)
+{
+	int ret;
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+	struct task_struct *fe_thread;
+
+	dev_dbg(fe->dvb->device, "%s:\n", __func__);
+
+	if (fepriv->thread) {
+		if (fe->exit == DVB_FE_NO_EXIT)
+			return 0;
+		else
+			dvb_frontend_stop(fe);
+	}
+
+	if (signal_pending(current))
+		return -EINTR;
+	if (down_interruptible(&fepriv->sem))
+		return -EINTR;
+
+	fepriv->state = FESTATE_IDLE;
+	fe->exit = DVB_FE_NO_EXIT;
+	fepriv->thread = NULL;
+	mb();
+
+	fe_thread = kthread_run(dvb_frontend_thread, fe,
+				"kdvb-ad-%i-fe-%i", fe->dvb->num, fe->id);
+	if (IS_ERR(fe_thread)) {
+		ret = PTR_ERR(fe_thread);
+		dev_warn(fe->dvb->device,
+			 "dvb_frontend_start: failed to start kthread (%d)\n",
+			 ret);
+		up(&fepriv->sem);
+		return ret;
+	}
+	fepriv->thread = fe_thread;
+	return 0;
+}
+
+static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
+					      u32 *freq_min, u32 *freq_max,
+					      u32 *tolerance)
+{
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+	u32 tuner_min = fe->ops.tuner_ops.info.frequency_min_hz;
+	u32 tuner_max = fe->ops.tuner_ops.info.frequency_max_hz;
+	u32 frontend_min = fe->ops.info.frequency_min_hz;
+	u32 frontend_max = fe->ops.info.frequency_max_hz;
+
+	*freq_min = max(frontend_min, tuner_min);
+
+	if (frontend_max == 0)
+		*freq_max = tuner_max;
+	else if (tuner_max == 0)
+		*freq_max = frontend_max;
+	else
+		*freq_max = min(frontend_max, tuner_max);
+
+	if (*freq_min == 0 || *freq_max == 0)
+		dev_warn(fe->dvb->device,
+			 "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
+			 fe->dvb->num, fe->id);
+
+	/* If the standard is for satellite, convert frequencies to kHz */
+	switch (c->delivery_system) {
+	case SYS_DVBS:
+	case SYS_DVBS2:
+	case SYS_TURBO:
+	case SYS_ISDBS:
+		*freq_min /= kHz;
+		*freq_max /= kHz;
+		if (tolerance)
+			*tolerance = fe->ops.info.frequency_tolerance_hz / kHz;
+
+		break;
+	default:
+		if (tolerance)
+			*tolerance = fe->ops.info.frequency_tolerance_hz;
+		break;
+	}
+}
+
+static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+	u32 fe_step = fe->ops.info.frequency_stepsize_hz;
+	u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz;
+	u32 step = max(fe_step, tuner_step);
+
+	switch (c->delivery_system) {
+	case SYS_DVBS:
+	case SYS_DVBS2:
+	case SYS_TURBO:
+	case SYS_ISDBS:
+		step /= kHz;
+		break;
+	default:
+		break;
+	}
+
+	return step;
+}
+
+static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+	u32 freq_min;
+	u32 freq_max;
+
+	/* range check: frequency */
+	dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL);
+	if ((freq_min && c->frequency < freq_min) ||
+	    (freq_max && c->frequency > freq_max)) {
+		dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
+			 fe->dvb->num, fe->id, c->frequency,
+			 freq_min, freq_max);
+		return -EINVAL;
+	}
+
+	/* range check: symbol rate */
+	switch (c->delivery_system) {
+	case SYS_DVBS:
+	case SYS_DVBS2:
+	case SYS_TURBO:
+	case SYS_DVBC_ANNEX_A:
+	case SYS_DVBC_ANNEX_C:
+		if ((fe->ops.info.symbol_rate_min &&
+		     c->symbol_rate < fe->ops.info.symbol_rate_min) ||
+		    (fe->ops.info.symbol_rate_max &&
+		     c->symbol_rate > fe->ops.info.symbol_rate_max)) {
+			dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
+				 fe->dvb->num, fe->id, c->symbol_rate,
+				 fe->ops.info.symbol_rate_min,
+				 fe->ops.info.symbol_rate_max);
+			return -EINVAL;
+		}
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+	int i;
+	u32 delsys;
+
+	delsys = c->delivery_system;
+	memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
+	c->delivery_system = delsys;
+
+	dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
+		__func__, c->delivery_system);
+
+	c->transmission_mode = TRANSMISSION_MODE_AUTO;
+	c->bandwidth_hz = 0;	/* AUTO */
+	c->guard_interval = GUARD_INTERVAL_AUTO;
+	c->hierarchy = HIERARCHY_AUTO;
+	c->symbol_rate = 0;
+	c->code_rate_HP = FEC_AUTO;
+	c->code_rate_LP = FEC_AUTO;
+	c->fec_inner = FEC_AUTO;
+	c->rolloff = ROLLOFF_AUTO;
+	c->voltage = SEC_VOLTAGE_OFF;
+	c->sectone = SEC_TONE_OFF;
+	c->pilot = PILOT_AUTO;
+
+	c->isdbt_partial_reception = 0;
+	c->isdbt_sb_mode = 0;
+	c->isdbt_sb_subchannel = 0;
+	c->isdbt_sb_segment_idx = 0;
+	c->isdbt_sb_segment_count = 0;
+	c->isdbt_layer_enabled = 7;	/* All layers (A,B,C) */
+	for (i = 0; i < 3; i++) {
+		c->layer[i].fec = FEC_AUTO;
+		c->layer[i].modulation = QAM_AUTO;
+		c->layer[i].interleaving = 0;
+		c->layer[i].segment_count = 0;
+	}
+
+	c->stream_id = NO_STREAM_ID_FILTER;
+	c->scrambling_sequence_index = 0;/* default sequence */
+
+	switch (c->delivery_system) {
+	case SYS_DVBS:
+	case SYS_DVBS2:
+	case SYS_TURBO:
+		c->modulation = QPSK;   /* implied for DVB-S in legacy API */
+		c->rolloff = ROLLOFF_35;/* implied for DVB-S */
+		break;
+	case SYS_ATSC:
+		c->modulation = VSB_8;
+		break;
+	case SYS_ISDBS:
+		c->symbol_rate = 28860000;
+		c->rolloff = ROLLOFF_35;
+		c->bandwidth_hz = c->symbol_rate / 100 * 135;
+		break;
+	default:
+		c->modulation = QAM_AUTO;
+		break;
+	}
+
+	c->lna = LNA_AUTO;
+
+	return 0;
+}
+
+#define _DTV_CMD(n, s, b) \
+[n] = { \
+	.name = #n, \
+	.cmd  = n, \
+	.set  = s,\
+	.buffer = b \
+}
+
+struct dtv_cmds_h {
+	char	*name;		/* A display name for debugging purposes */
+
+	__u32	cmd;		/* A unique ID */
+
+	/* Flags */
+	__u32	set:1;		/* Either a set or get property */
+	__u32	buffer:1;	/* Does this property use the buffer? */
+	__u32	reserved:30;	/* Align */
+};
+
+static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = {
+	_DTV_CMD(DTV_TUNE, 1, 0),
+	_DTV_CMD(DTV_CLEAR, 1, 0),
+
+	/* Set */
+	_DTV_CMD(DTV_FREQUENCY, 1, 0),
+	_DTV_CMD(DTV_BANDWIDTH_HZ, 1, 0),
+	_DTV_CMD(DTV_MODULATION, 1, 0),
+	_DTV_CMD(DTV_INVERSION, 1, 0),
+	_DTV_CMD(DTV_DISEQC_MASTER, 1, 1),
+	_DTV_CMD(DTV_SYMBOL_RATE, 1, 0),
+	_DTV_CMD(DTV_INNER_FEC, 1, 0),
+	_DTV_CMD(DTV_VOLTAGE, 1, 0),
+	_DTV_CMD(DTV_TONE, 1, 0),
+	_DTV_CMD(DTV_PILOT, 1, 0),
+	_DTV_CMD(DTV_ROLLOFF, 1, 0),
+	_DTV_CMD(DTV_DELIVERY_SYSTEM, 1, 0),
+	_DTV_CMD(DTV_HIERARCHY, 1, 0),
+	_DTV_CMD(DTV_CODE_RATE_HP, 1, 0),
+	_DTV_CMD(DTV_CODE_RATE_LP, 1, 0),
+	_DTV_CMD(DTV_GUARD_INTERVAL, 1, 0),
+	_DTV_CMD(DTV_TRANSMISSION_MODE, 1, 0),
+	_DTV_CMD(DTV_INTERLEAVING, 1, 0),
+
+	_DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION, 1, 0),
+	_DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING, 1, 0),
+	_DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID, 1, 0),
+	_DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX, 1, 0),
+	_DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT, 1, 0),
+	_DTV_CMD(DTV_ISDBT_LAYER_ENABLED, 1, 0),
+	_DTV_CMD(DTV_ISDBT_LAYERA_FEC, 1, 0),
+	_DTV_CMD(DTV_ISDBT_LAYERA_MODULATION, 1, 0),
+	_DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT, 1, 0),
+	_DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING, 1, 0),
+	_DTV_CMD(DTV_ISDBT_LAYERB_FEC, 1, 0),
+	_DTV_CMD(DTV_ISDBT_LAYERB_MODULATION, 1, 0),
+	_DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT, 1, 0),
+	_DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING, 1, 0),
+	_DTV_CMD(DTV_ISDBT_LAYERC_FEC, 1, 0),
+	_DTV_CMD(DTV_ISDBT_LAYERC_MODULATION, 1, 0),
+	_DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT, 1, 0),
+	_DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING, 1, 0),
+
+	_DTV_CMD(DTV_STREAM_ID, 1, 0),
+	_DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY, 1, 0),
+	_DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX, 1, 0),
+	_DTV_CMD(DTV_LNA, 1, 0),
+
+	/* Get */
+	_DTV_CMD(DTV_DISEQC_SLAVE_REPLY, 0, 1),
+	_DTV_CMD(DTV_API_VERSION, 0, 0),
+
+	_DTV_CMD(DTV_ENUM_DELSYS, 0, 0),
+
+	_DTV_CMD(DTV_ATSCMH_PARADE_ID, 1, 0),
+	_DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE, 1, 0),
+
+	_DTV_CMD(DTV_ATSCMH_FIC_VER, 0, 0),
+	_DTV_CMD(DTV_ATSCMH_NOG, 0, 0),
+	_DTV_CMD(DTV_ATSCMH_TNOG, 0, 0),
+	_DTV_CMD(DTV_ATSCMH_SGN, 0, 0),
+	_DTV_CMD(DTV_ATSCMH_PRC, 0, 0),
+	_DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE, 0, 0),
+	_DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI, 0, 0),
+	_DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC, 0, 0),
+	_DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE, 0, 0),
+	_DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A, 0, 0),
+	_DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0),
+	_DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0),
+	_DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0),
+
+	/* Statistics API */
+	_DTV_CMD(DTV_STAT_SIGNAL_STRENGTH, 0, 0),
+	_DTV_CMD(DTV_STAT_CNR, 0, 0),
+	_DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT, 0, 0),
+	_DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT, 0, 0),
+	_DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT, 0, 0),
+	_DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT, 0, 0),
+	_DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT, 0, 0),
+	_DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT, 0, 0),
+};
+
+/* Synchronise the legacy tuning parameters into the cache, so that demodulator
+ * drivers can use a single set_frontend tuning function, regardless of whether
+ * it's being used for the legacy or new API, reducing code and complexity.
+ */
+static int dtv_property_cache_sync(struct dvb_frontend *fe,
+				   struct dtv_frontend_properties *c,
+				   const struct dvb_frontend_parameters *p)
+{
+	c->frequency = p->frequency;
+	c->inversion = p->inversion;
+
+	switch (dvbv3_type(c->delivery_system)) {
+	case DVBV3_QPSK:
+		dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
+		c->symbol_rate = p->u.qpsk.symbol_rate;
+		c->fec_inner = p->u.qpsk.fec_inner;
+		break;
+	case DVBV3_QAM:
+		dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
+		c->symbol_rate = p->u.qam.symbol_rate;
+		c->fec_inner = p->u.qam.fec_inner;
+		c->modulation = p->u.qam.modulation;
+		break;
+	case DVBV3_OFDM:
+		dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
+
+		switch (p->u.ofdm.bandwidth) {
+		case BANDWIDTH_10_MHZ:
+			c->bandwidth_hz = 10000000;
+			break;
+		case BANDWIDTH_8_MHZ:
+			c->bandwidth_hz = 8000000;
+			break;
+		case BANDWIDTH_7_MHZ:
+			c->bandwidth_hz = 7000000;
+			break;
+		case BANDWIDTH_6_MHZ:
+			c->bandwidth_hz = 6000000;
+			break;
+		case BANDWIDTH_5_MHZ:
+			c->bandwidth_hz = 5000000;
+			break;
+		case BANDWIDTH_1_712_MHZ:
+			c->bandwidth_hz = 1712000;
+			break;
+		case BANDWIDTH_AUTO:
+			c->bandwidth_hz = 0;
+		}
+
+		c->code_rate_HP = p->u.ofdm.code_rate_HP;
+		c->code_rate_LP = p->u.ofdm.code_rate_LP;
+		c->modulation = p->u.ofdm.constellation;
+		c->transmission_mode = p->u.ofdm.transmission_mode;
+		c->guard_interval = p->u.ofdm.guard_interval;
+		c->hierarchy = p->u.ofdm.hierarchy_information;
+		break;
+	case DVBV3_ATSC:
+		dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
+		c->modulation = p->u.vsb.modulation;
+		if (c->delivery_system == SYS_ATSCMH)
+			break;
+		if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
+			c->delivery_system = SYS_ATSC;
+		else
+			c->delivery_system = SYS_DVBC_ANNEX_B;
+		break;
+	case DVBV3_UNKNOWN:
+		dev_err(fe->dvb->device,
+			"%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
+			__func__, c->delivery_system);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* Ensure the cached values are set correctly in the frontend
+ * legacy tuning structures, for the advanced tuning API.
+ */
+static int
+dtv_property_legacy_params_sync(struct dvb_frontend *fe,
+				const struct dtv_frontend_properties *c,
+				struct dvb_frontend_parameters *p)
+{
+	p->frequency = c->frequency;
+	p->inversion = c->inversion;
+
+	switch (dvbv3_type(c->delivery_system)) {
+	case DVBV3_UNKNOWN:
+		dev_err(fe->dvb->device,
+			"%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
+			__func__, c->delivery_system);
+		return -EINVAL;
+	case DVBV3_QPSK:
+		dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
+		p->u.qpsk.symbol_rate = c->symbol_rate;
+		p->u.qpsk.fec_inner = c->fec_inner;
+		break;
+	case DVBV3_QAM:
+		dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
+		p->u.qam.symbol_rate = c->symbol_rate;
+		p->u.qam.fec_inner = c->fec_inner;
+		p->u.qam.modulation = c->modulation;
+		break;
+	case DVBV3_OFDM:
+		dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
+		switch (c->bandwidth_hz) {
+		case 10000000:
+			p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
+			break;
+		case 8000000:
+			p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
+			break;
+		case 7000000:
+			p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
+			break;
+		case 6000000:
+			p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
+			break;
+		case 5000000:
+			p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
+			break;
+		case 1712000:
+			p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
+			break;
+		case 0:
+		default:
+			p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
+		}
+		p->u.ofdm.code_rate_HP = c->code_rate_HP;
+		p->u.ofdm.code_rate_LP = c->code_rate_LP;
+		p->u.ofdm.constellation = c->modulation;
+		p->u.ofdm.transmission_mode = c->transmission_mode;
+		p->u.ofdm.guard_interval = c->guard_interval;
+		p->u.ofdm.hierarchy_information = c->hierarchy;
+		break;
+	case DVBV3_ATSC:
+		dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
+		p->u.vsb.modulation = c->modulation;
+		break;
+	}
+	return 0;
+}
+
+/**
+ * dtv_get_frontend - calls a callback for retrieving DTV parameters
+ * @fe:		struct dvb_frontend pointer
+ * @c:		struct dtv_frontend_properties pointer (DVBv5 cache)
+ * @p_out:	struct dvb_frontend_parameters pointer (DVBv3 FE struct)
+ *
+ * This routine calls either the DVBv3 or DVBv5 get_frontend call.
+ * If c is not null, it will update the DVBv5 cache struct pointed by it.
+ * If p_out is not null, it will update the DVBv3 params pointed by it.
+ */
+static int dtv_get_frontend(struct dvb_frontend *fe,
+			    struct dtv_frontend_properties *c,
+			    struct dvb_frontend_parameters *p_out)
+{
+	int r;
+
+	if (fe->ops.get_frontend) {
+		r = fe->ops.get_frontend(fe, c);
+		if (unlikely(r < 0))
+			return r;
+		if (p_out)
+			dtv_property_legacy_params_sync(fe, c, p_out);
+		return 0;
+	}
+
+	/* As everything is in cache, get_frontend fops are always supported */
+	return 0;
+}
+
+static int dvb_frontend_handle_ioctl(struct file *file,
+				     unsigned int cmd, void *parg);
+
+static int dtv_property_process_get(struct dvb_frontend *fe,
+				    const struct dtv_frontend_properties *c,
+				    struct dtv_property *tvp,
+				    struct file *file)
+{
+	int ncaps;
+
+	switch (tvp->cmd) {
+	case DTV_ENUM_DELSYS:
+		ncaps = 0;
+		while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
+			tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
+			ncaps++;
+		}
+		tvp->u.buffer.len = ncaps;
+		break;
+	case DTV_FREQUENCY:
+		tvp->u.data = c->frequency;
+		break;
+	case DTV_MODULATION:
+		tvp->u.data = c->modulation;
+		break;
+	case DTV_BANDWIDTH_HZ:
+		tvp->u.data = c->bandwidth_hz;
+		break;
+	case DTV_INVERSION:
+		tvp->u.data = c->inversion;
+		break;
+	case DTV_SYMBOL_RATE:
+		tvp->u.data = c->symbol_rate;
+		break;
+	case DTV_INNER_FEC:
+		tvp->u.data = c->fec_inner;
+		break;
+	case DTV_PILOT:
+		tvp->u.data = c->pilot;
+		break;
+	case DTV_ROLLOFF:
+		tvp->u.data = c->rolloff;
+		break;
+	case DTV_DELIVERY_SYSTEM:
+		tvp->u.data = c->delivery_system;
+		break;
+	case DTV_VOLTAGE:
+		tvp->u.data = c->voltage;
+		break;
+	case DTV_TONE:
+		tvp->u.data = c->sectone;
+		break;
+	case DTV_API_VERSION:
+		tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
+		break;
+	case DTV_CODE_RATE_HP:
+		tvp->u.data = c->code_rate_HP;
+		break;
+	case DTV_CODE_RATE_LP:
+		tvp->u.data = c->code_rate_LP;
+		break;
+	case DTV_GUARD_INTERVAL:
+		tvp->u.data = c->guard_interval;
+		break;
+	case DTV_TRANSMISSION_MODE:
+		tvp->u.data = c->transmission_mode;
+		break;
+	case DTV_HIERARCHY:
+		tvp->u.data = c->hierarchy;
+		break;
+	case DTV_INTERLEAVING:
+		tvp->u.data = c->interleaving;
+		break;
+
+	/* ISDB-T Support here */
+	case DTV_ISDBT_PARTIAL_RECEPTION:
+		tvp->u.data = c->isdbt_partial_reception;
+		break;
+	case DTV_ISDBT_SOUND_BROADCASTING:
+		tvp->u.data = c->isdbt_sb_mode;
+		break;
+	case DTV_ISDBT_SB_SUBCHANNEL_ID:
+		tvp->u.data = c->isdbt_sb_subchannel;
+		break;
+	case DTV_ISDBT_SB_SEGMENT_IDX:
+		tvp->u.data = c->isdbt_sb_segment_idx;
+		break;
+	case DTV_ISDBT_SB_SEGMENT_COUNT:
+		tvp->u.data = c->isdbt_sb_segment_count;
+		break;
+	case DTV_ISDBT_LAYER_ENABLED:
+		tvp->u.data = c->isdbt_layer_enabled;
+		break;
+	case DTV_ISDBT_LAYERA_FEC:
+		tvp->u.data = c->layer[0].fec;
+		break;
+	case DTV_ISDBT_LAYERA_MODULATION:
+		tvp->u.data = c->layer[0].modulation;
+		break;
+	case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
+		tvp->u.data = c->layer[0].segment_count;
+		break;
+	case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
+		tvp->u.data = c->layer[0].interleaving;
+		break;
+	case DTV_ISDBT_LAYERB_FEC:
+		tvp->u.data = c->layer[1].fec;
+		break;
+	case DTV_ISDBT_LAYERB_MODULATION:
+		tvp->u.data = c->layer[1].modulation;
+		break;
+	case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
+		tvp->u.data = c->layer[1].segment_count;
+		break;
+	case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
+		tvp->u.data = c->layer[1].interleaving;
+		break;
+	case DTV_ISDBT_LAYERC_FEC:
+		tvp->u.data = c->layer[2].fec;
+		break;
+	case DTV_ISDBT_LAYERC_MODULATION:
+		tvp->u.data = c->layer[2].modulation;
+		break;
+	case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
+		tvp->u.data = c->layer[2].segment_count;
+		break;
+	case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
+		tvp->u.data = c->layer[2].interleaving;
+		break;
+
+	/* Multistream support */
+	case DTV_STREAM_ID:
+	case DTV_DVBT2_PLP_ID_LEGACY:
+		tvp->u.data = c->stream_id;
+		break;
+
+	/* Physical layer scrambling support */
+	case DTV_SCRAMBLING_SEQUENCE_INDEX:
+		tvp->u.data = c->scrambling_sequence_index;
+		break;
+
+	/* ATSC-MH */
+	case DTV_ATSCMH_FIC_VER:
+		tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
+		break;
+	case DTV_ATSCMH_PARADE_ID:
+		tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
+		break;
+	case DTV_ATSCMH_NOG:
+		tvp->u.data = fe->dtv_property_cache.atscmh_nog;
+		break;
+	case DTV_ATSCMH_TNOG:
+		tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
+		break;
+	case DTV_ATSCMH_SGN:
+		tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
+		break;
+	case DTV_ATSCMH_PRC:
+		tvp->u.data = fe->dtv_property_cache.atscmh_prc;
+		break;
+	case DTV_ATSCMH_RS_FRAME_MODE:
+		tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
+		break;
+	case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
+		tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
+		break;
+	case DTV_ATSCMH_RS_CODE_MODE_PRI:
+		tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
+		break;
+	case DTV_ATSCMH_RS_CODE_MODE_SEC:
+		tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
+		break;
+	case DTV_ATSCMH_SCCC_BLOCK_MODE:
+		tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
+		break;
+	case DTV_ATSCMH_SCCC_CODE_MODE_A:
+		tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
+		break;
+	case DTV_ATSCMH_SCCC_CODE_MODE_B:
+		tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
+		break;
+	case DTV_ATSCMH_SCCC_CODE_MODE_C:
+		tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
+		break;
+	case DTV_ATSCMH_SCCC_CODE_MODE_D:
+		tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
+		break;
+
+	case DTV_LNA:
+		tvp->u.data = c->lna;
+		break;
+
+	/* Fill quality measures */
+	case DTV_STAT_SIGNAL_STRENGTH:
+		tvp->u.st = c->strength;
+		break;
+	case DTV_STAT_CNR:
+		tvp->u.st = c->cnr;
+		break;
+	case DTV_STAT_PRE_ERROR_BIT_COUNT:
+		tvp->u.st = c->pre_bit_error;
+		break;
+	case DTV_STAT_PRE_TOTAL_BIT_COUNT:
+		tvp->u.st = c->pre_bit_count;
+		break;
+	case DTV_STAT_POST_ERROR_BIT_COUNT:
+		tvp->u.st = c->post_bit_error;
+		break;
+	case DTV_STAT_POST_TOTAL_BIT_COUNT:
+		tvp->u.st = c->post_bit_count;
+		break;
+	case DTV_STAT_ERROR_BLOCK_COUNT:
+		tvp->u.st = c->block_error;
+		break;
+	case DTV_STAT_TOTAL_BLOCK_COUNT:
+		tvp->u.st = c->block_count;
+		break;
+	default:
+		dev_dbg(fe->dvb->device,
+			"%s: FE property %d doesn't exist\n",
+			__func__, tvp->cmd);
+		return -EINVAL;
+	}
+
+	if (!dtv_cmds[tvp->cmd].buffer)
+		dev_dbg(fe->dvb->device,
+			"%s: GET cmd 0x%08x (%s) = 0x%08x\n",
+			__func__, tvp->cmd, dtv_cmds[tvp->cmd].name,
+			tvp->u.data);
+	else
+		dev_dbg(fe->dvb->device,
+			"%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
+			__func__,
+			tvp->cmd, dtv_cmds[tvp->cmd].name,
+			tvp->u.buffer.len,
+			tvp->u.buffer.len, tvp->u.buffer.data);
+
+	return 0;
+}
+
+static int dtv_set_frontend(struct dvb_frontend *fe);
+
+static bool is_dvbv3_delsys(u32 delsys)
+{
+	return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
+	       (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
+}
+
+/**
+ * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
+ * @fe:			struct frontend;
+ * @delsys:			DVBv5 type that will be used for emulation
+ *
+ * Provides emulation for delivery systems that are compatible with the old
+ * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
+ * using a DVB-S2 only frontend just like it were a DVB-S, if the frontent
+ * parameters are compatible with DVB-S spec.
+ */
+static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
+{
+	int i;
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+
+	c->delivery_system = delsys;
+
+	/*
+	 * If the call is for ISDB-T, put it into full-seg, auto mode, TV
+	 */
+	if (c->delivery_system == SYS_ISDBT) {
+		dev_dbg(fe->dvb->device,
+			"%s: Using defaults for SYS_ISDBT\n",
+			__func__);
+
+		if (!c->bandwidth_hz)
+			c->bandwidth_hz = 6000000;
+
+		c->isdbt_partial_reception = 0;
+		c->isdbt_sb_mode = 0;
+		c->isdbt_sb_subchannel = 0;
+		c->isdbt_sb_segment_idx = 0;
+		c->isdbt_sb_segment_count = 0;
+		c->isdbt_layer_enabled = 7;
+		for (i = 0; i < 3; i++) {
+			c->layer[i].fec = FEC_AUTO;
+			c->layer[i].modulation = QAM_AUTO;
+			c->layer[i].interleaving = 0;
+			c->layer[i].segment_count = 0;
+		}
+	}
+	dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
+		__func__, c->delivery_system);
+
+	return 0;
+}
+
+/**
+ * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
+ * @fe:			frontend struct
+ * @desired_system:	delivery system requested by the user
+ *
+ * A DVBv5 call know what's the desired system it wants. So, set it.
+ *
+ * There are, however, a few known issues with early DVBv5 applications that
+ * are also handled by this logic:
+ *
+ * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
+ *    This is an API violation, but, as we don't want to break userspace,
+ *    convert it to the first supported delivery system.
+ * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
+ *    example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
+ *    ISDB-T provided backward compat with DVB-T.
+ */
+static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
+				     u32 desired_system)
+{
+	int ncaps;
+	u32 delsys = SYS_UNDEFINED;
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+	enum dvbv3_emulation_type type;
+
+	/*
+	 * It was reported that some old DVBv5 applications were
+	 * filling delivery_system with SYS_UNDEFINED. If this happens,
+	 * assume that the application wants to use the first supported
+	 * delivery system.
+	 */
+	if (desired_system == SYS_UNDEFINED)
+		desired_system = fe->ops.delsys[0];
+
+	/*
+	 * This is a DVBv5 call. So, it likely knows the supported
+	 * delivery systems. So, check if the desired delivery system is
+	 * supported
+	 */
+	ncaps = 0;
+	while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
+		if (fe->ops.delsys[ncaps] == desired_system) {
+			c->delivery_system = desired_system;
+			dev_dbg(fe->dvb->device,
+				"%s: Changing delivery system to %d\n",
+				__func__, desired_system);
+			return 0;
+		}
+		ncaps++;
+	}
+
+	/*
+	 * The requested delivery system isn't supported. Maybe userspace
+	 * is requesting a DVBv3 compatible delivery system.
+	 *
+	 * The emulation only works if the desired system is one of the
+	 * delivery systems supported by DVBv3 API
+	 */
+	if (!is_dvbv3_delsys(desired_system)) {
+		dev_dbg(fe->dvb->device,
+			"%s: Delivery system %d not supported.\n",
+			__func__, desired_system);
+		return -EINVAL;
+	}
+
+	type = dvbv3_type(desired_system);
+
+	/*
+	* Get the last non-DVBv3 delivery system that has the same type
+	* of the desired system
+	*/
+	ncaps = 0;
+	while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
+		if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
+			delsys = fe->ops.delsys[ncaps];
+		ncaps++;
+	}
+
+	/* There's nothing compatible with the desired delivery system */
+	if (delsys == SYS_UNDEFINED) {
+		dev_dbg(fe->dvb->device,
+			"%s: Delivery system %d not supported on emulation mode.\n",
+			__func__, desired_system);
+		return -EINVAL;
+	}
+
+	dev_dbg(fe->dvb->device,
+		"%s: Using delivery system %d emulated as if it were %d\n",
+		__func__, delsys, desired_system);
+
+	return emulate_delivery_system(fe, desired_system);
+}
+
+/**
+ * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
+ * @fe:	frontend struct
+ *
+ * A DVBv3 call doesn't know what's the desired system it wants. It also
+ * doesn't allow to switch between different types. Due to that, userspace
+ * should use DVBv5 instead.
+ * However, in order to avoid breaking userspace API, limited backward
+ * compatibility support is provided.
+ *
+ * There are some delivery systems that are incompatible with DVBv3 calls.
+ *
+ * This routine should work fine for frontends that support just one delivery
+ * system.
+ *
+ * For frontends that support multiple frontends:
+ * 1) It defaults to use the first supported delivery system. There's an
+ *    userspace application that allows changing it at runtime;
+ *
+ * 2) If the current delivery system is not compatible with DVBv3, it gets
+ *    the first one that it is compatible.
+ *
+ * NOTE: in order for this to work with applications like Kaffeine that
+ *	uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
+ *	DVB-S, drivers that support both DVB-S and DVB-S2 should have the
+ *	SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
+ *	to DVB-S.
+ */
+static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
+{
+	int ncaps;
+	u32 delsys = SYS_UNDEFINED;
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+
+	/* If not set yet, defaults to the first supported delivery system */
+	if (c->delivery_system == SYS_UNDEFINED)
+		c->delivery_system = fe->ops.delsys[0];
+
+	/*
+	 * Trivial case: just use the current one, if it already a DVBv3
+	 * delivery system
+	 */
+	if (is_dvbv3_delsys(c->delivery_system)) {
+		dev_dbg(fe->dvb->device,
+			"%s: Using delivery system to %d\n",
+			__func__, c->delivery_system);
+		return 0;
+	}
+
+	/*
+	 * Seek for the first delivery system that it is compatible with a
+	 * DVBv3 standard
+	 */
+	ncaps = 0;
+	while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
+		if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
+			delsys = fe->ops.delsys[ncaps];
+			break;
+		}
+		ncaps++;
+	}
+	if (delsys == SYS_UNDEFINED) {
+		dev_dbg(fe->dvb->device,
+			"%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
+			__func__);
+		return -EINVAL;
+	}
+	return emulate_delivery_system(fe, delsys);
+}
+
+/**
+ * dtv_property_process_set -  Sets a single DTV property
+ * @fe:		Pointer to &struct dvb_frontend
+ * @file:	Pointer to &struct file
+ * @cmd:	Digital TV command
+ * @data:	An unsigned 32-bits number
+ *
+ * This routine assigns the property
+ * value to the corresponding member of
+ * &struct dtv_frontend_properties
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+static int dtv_property_process_set(struct dvb_frontend *fe,
+				    struct file *file,
+				    u32 cmd, u32 data)
+{
+	int r = 0;
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+
+	/** Dump DTV command name and value*/
+	if (!cmd || cmd > DTV_MAX_COMMAND)
+		dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
+			 __func__, cmd);
+	else
+		dev_dbg(fe->dvb->device,
+			"%s: SET cmd 0x%08x (%s) to 0x%08x\n",
+			__func__, cmd, dtv_cmds[cmd].name, data);
+	switch (cmd) {
+	case DTV_CLEAR:
+		/*
+		 * Reset a cache of data specific to the frontend here. This does
+		 * not effect hardware.
+		 */
+		dvb_frontend_clear_cache(fe);
+		break;
+	case DTV_TUNE:
+		/*
+		 * Use the cached Digital TV properties to tune the
+		 * frontend
+		 */
+		dev_dbg(fe->dvb->device,
+			"%s: Setting the frontend from property cache\n",
+			__func__);
+
+		r = dtv_set_frontend(fe);
+		break;
+	case DTV_FREQUENCY:
+		c->frequency = data;
+		break;
+	case DTV_MODULATION:
+		c->modulation = data;
+		break;
+	case DTV_BANDWIDTH_HZ:
+		c->bandwidth_hz = data;
+		break;
+	case DTV_INVERSION:
+		c->inversion = data;
+		break;
+	case DTV_SYMBOL_RATE:
+		c->symbol_rate = data;
+		break;
+	case DTV_INNER_FEC:
+		c->fec_inner = data;
+		break;
+	case DTV_PILOT:
+		c->pilot = data;
+		break;
+	case DTV_ROLLOFF:
+		c->rolloff = data;
+		break;
+	case DTV_DELIVERY_SYSTEM:
+		r = dvbv5_set_delivery_system(fe, data);
+		break;
+	case DTV_VOLTAGE:
+		c->voltage = data;
+		r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
+					      (void *)c->voltage);
+		break;
+	case DTV_TONE:
+		c->sectone = data;
+		r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
+					      (void *)c->sectone);
+		break;
+	case DTV_CODE_RATE_HP:
+		c->code_rate_HP = data;
+		break;
+	case DTV_CODE_RATE_LP:
+		c->code_rate_LP = data;
+		break;
+	case DTV_GUARD_INTERVAL:
+		c->guard_interval = data;
+		break;
+	case DTV_TRANSMISSION_MODE:
+		c->transmission_mode = data;
+		break;
+	case DTV_HIERARCHY:
+		c->hierarchy = data;
+		break;
+	case DTV_INTERLEAVING:
+		c->interleaving = data;
+		break;
+
+	/* ISDB-T Support here */
+	case DTV_ISDBT_PARTIAL_RECEPTION:
+		c->isdbt_partial_reception = data;
+		break;
+	case DTV_ISDBT_SOUND_BROADCASTING:
+		c->isdbt_sb_mode = data;
+		break;
+	case DTV_ISDBT_SB_SUBCHANNEL_ID:
+		c->isdbt_sb_subchannel = data;
+		break;
+	case DTV_ISDBT_SB_SEGMENT_IDX:
+		c->isdbt_sb_segment_idx = data;
+		break;
+	case DTV_ISDBT_SB_SEGMENT_COUNT:
+		c->isdbt_sb_segment_count = data;
+		break;
+	case DTV_ISDBT_LAYER_ENABLED:
+		c->isdbt_layer_enabled = data;
+		break;
+	case DTV_ISDBT_LAYERA_FEC:
+		c->layer[0].fec = data;
+		break;
+	case DTV_ISDBT_LAYERA_MODULATION:
+		c->layer[0].modulation = data;
+		break;
+	case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
+		c->layer[0].segment_count = data;
+		break;
+	case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
+		c->layer[0].interleaving = data;
+		break;
+	case DTV_ISDBT_LAYERB_FEC:
+		c->layer[1].fec = data;
+		break;
+	case DTV_ISDBT_LAYERB_MODULATION:
+		c->layer[1].modulation = data;
+		break;
+	case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
+		c->layer[1].segment_count = data;
+		break;
+	case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
+		c->layer[1].interleaving = data;
+		break;
+	case DTV_ISDBT_LAYERC_FEC:
+		c->layer[2].fec = data;
+		break;
+	case DTV_ISDBT_LAYERC_MODULATION:
+		c->layer[2].modulation = data;
+		break;
+	case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
+		c->layer[2].segment_count = data;
+		break;
+	case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
+		c->layer[2].interleaving = data;
+		break;
+
+	/* Multistream support */
+	case DTV_STREAM_ID:
+	case DTV_DVBT2_PLP_ID_LEGACY:
+		c->stream_id = data;
+		break;
+
+	/* Physical layer scrambling support */
+	case DTV_SCRAMBLING_SEQUENCE_INDEX:
+		c->scrambling_sequence_index = data;
+		break;
+
+	/* ATSC-MH */
+	case DTV_ATSCMH_PARADE_ID:
+		fe->dtv_property_cache.atscmh_parade_id = data;
+		break;
+	case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
+		fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
+		break;
+
+	case DTV_LNA:
+		c->lna = data;
+		if (fe->ops.set_lna)
+			r = fe->ops.set_lna(fe);
+		if (r < 0)
+			c->lna = LNA_AUTO;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return r;
+}
+
+static int dvb_frontend_do_ioctl(struct file *file, unsigned int cmd,
+				 void *parg)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_frontend *fe = dvbdev->priv;
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+	int err;
+
+	dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
+	if (down_interruptible(&fepriv->sem))
+		return -ERESTARTSYS;
+
+	if (fe->exit != DVB_FE_NO_EXIT) {
+		up(&fepriv->sem);
+		return -ENODEV;
+	}
+
+	/*
+	 * If the frontend is opened in read-only mode, only the ioctls
+	 * that don't interfere with the tune logic should be accepted.
+	 * That allows an external application to monitor the DVB QoS and
+	 * statistics parameters.
+	 *
+	 * That matches all _IOR() ioctls, except for two special cases:
+	 *   - FE_GET_EVENT is part of the tuning logic on a DVB application;
+	 *   - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
+	 *     setup
+	 * So, those two ioctls should also return -EPERM, as otherwise
+	 * reading from them would interfere with a DVB tune application
+	 */
+	if ((file->f_flags & O_ACCMODE) == O_RDONLY
+	    && (_IOC_DIR(cmd) != _IOC_READ
+		|| cmd == FE_GET_EVENT
+		|| cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
+		up(&fepriv->sem);
+		return -EPERM;
+	}
+
+	err = dvb_frontend_handle_ioctl(file, cmd, parg);
+
+	up(&fepriv->sem);
+	return err;
+}
+
+static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
+			       unsigned long arg)
+{
+	struct dvb_device *dvbdev = file->private_data;
+
+	if (!dvbdev)
+		return -ENODEV;
+
+	return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl);
+}
+
+#ifdef CONFIG_COMPAT
+struct compat_dtv_property {
+	__u32 cmd;
+	__u32 reserved[3];
+	union {
+		__u32 data;
+		struct dtv_fe_stats st;
+		struct {
+			__u8 data[32];
+			__u32 len;
+			__u32 reserved1[3];
+			compat_uptr_t reserved2;
+		} buffer;
+	} u;
+	int result;
+} __attribute__ ((packed));
+
+struct compat_dtv_properties {
+	__u32 num;
+	compat_uptr_t props;
+};
+
+#define COMPAT_FE_SET_PROPERTY	   _IOW('o', 82, struct compat_dtv_properties)
+#define COMPAT_FE_GET_PROPERTY	   _IOR('o', 83, struct compat_dtv_properties)
+
+static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
+					    unsigned long arg)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_frontend *fe = dvbdev->priv;
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+	int i, err = 0;
+
+	if (cmd == COMPAT_FE_SET_PROPERTY) {
+		struct compat_dtv_properties prop, *tvps = NULL;
+		struct compat_dtv_property *tvp = NULL;
+
+		if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
+			return -EFAULT;
+
+		tvps = &prop;
+
+		/*
+		 * Put an arbitrary limit on the number of messages that can
+		 * be sent at once
+		 */
+		if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
+			return -EINVAL;
+
+		tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
+		if (IS_ERR(tvp))
+			return PTR_ERR(tvp);
+
+		for (i = 0; i < tvps->num; i++) {
+			err = dtv_property_process_set(fe, file,
+						       (tvp + i)->cmd,
+						       (tvp + i)->u.data);
+			if (err < 0) {
+				kfree(tvp);
+				return err;
+			}
+		}
+		kfree(tvp);
+	} else if (cmd == COMPAT_FE_GET_PROPERTY) {
+		struct compat_dtv_properties prop, *tvps = NULL;
+		struct compat_dtv_property *tvp = NULL;
+		struct dtv_frontend_properties getp = fe->dtv_property_cache;
+
+		if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
+			return -EFAULT;
+
+		tvps = &prop;
+
+		/*
+		 * Put an arbitrary limit on the number of messages that can
+		 * be sent at once
+		 */
+		if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
+			return -EINVAL;
+
+		tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
+		if (IS_ERR(tvp))
+			return PTR_ERR(tvp);
+
+		/*
+		 * Let's use our own copy of property cache, in order to
+		 * avoid mangling with DTV zigzag logic, as drivers might
+		 * return crap, if they don't check if the data is available
+		 * before updating the properties cache.
+		 */
+		if (fepriv->state != FESTATE_IDLE) {
+			err = dtv_get_frontend(fe, &getp, NULL);
+			if (err < 0) {
+				kfree(tvp);
+				return err;
+			}
+		}
+		for (i = 0; i < tvps->num; i++) {
+			err = dtv_property_process_get(
+			    fe, &getp, (struct dtv_property *)(tvp + i), file);
+			if (err < 0) {
+				kfree(tvp);
+				return err;
+			}
+		}
+
+		if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
+				 tvps->num * sizeof(struct compat_dtv_property))) {
+			kfree(tvp);
+			return -EFAULT;
+		}
+		kfree(tvp);
+	}
+
+	return err;
+}
+
+static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
+				      unsigned long arg)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_frontend *fe = dvbdev->priv;
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+	int err;
+
+	if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
+		if (down_interruptible(&fepriv->sem))
+			return -ERESTARTSYS;
+
+		err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
+
+		up(&fepriv->sem);
+		return err;
+	}
+
+	return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
+static int dtv_set_frontend(struct dvb_frontend *fe)
+{
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+	struct dvb_frontend_tune_settings fetunesettings;
+	u32 rolloff = 0;
+
+	if (dvb_frontend_check_parameters(fe) < 0)
+		return -EINVAL;
+
+	/*
+	 * Initialize output parameters to match the values given by
+	 * the user. FE_SET_FRONTEND triggers an initial frontend event
+	 * with status = 0, which copies output parameters to userspace.
+	 */
+	dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
+
+	/*
+	 * Be sure that the bandwidth will be filled for all
+	 * non-satellite systems, as tuners need to know what
+	 * low pass/Nyquist half filter should be applied, in
+	 * order to avoid inter-channel noise.
+	 *
+	 * ISDB-T and DVB-T/T2 already sets bandwidth.
+	 * ATSC and DVB-C don't set, so, the core should fill it.
+	 *
+	 * On DVB-C Annex A and C, the bandwidth is a function of
+	 * the roll-off and symbol rate. Annex B defines different
+	 * roll-off factors depending on the modulation. Fortunately,
+	 * Annex B is only used with 6MHz, so there's no need to
+	 * calculate it.
+	 *
+	 * While not officially supported, a side effect of handling it at
+	 * the cache level is that a program could retrieve the bandwidth
+	 * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
+	 */
+	switch (c->delivery_system) {
+	case SYS_ATSC:
+	case SYS_DVBC_ANNEX_B:
+		c->bandwidth_hz = 6000000;
+		break;
+	case SYS_DVBC_ANNEX_A:
+		rolloff = 115;
+		break;
+	case SYS_DVBC_ANNEX_C:
+		rolloff = 113;
+		break;
+	case SYS_DVBS:
+	case SYS_TURBO:
+	case SYS_ISDBS:
+		rolloff = 135;
+		break;
+	case SYS_DVBS2:
+		switch (c->rolloff) {
+		case ROLLOFF_20:
+			rolloff = 120;
+			break;
+		case ROLLOFF_25:
+			rolloff = 125;
+			break;
+		default:
+		case ROLLOFF_35:
+			rolloff = 135;
+		}
+		break;
+	default:
+		break;
+	}
+	if (rolloff)
+		c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
+
+	/* force auto frequency inversion if requested */
+	if (dvb_force_auto_inversion)
+		c->inversion = INVERSION_AUTO;
+
+	/*
+	 * without hierarchical coding code_rate_LP is irrelevant,
+	 * so we tolerate the otherwise invalid FEC_NONE setting
+	 */
+	if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
+		c->code_rate_LP = FEC_AUTO;
+
+	/* get frontend-specific tuning settings */
+	memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
+	if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
+		fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
+		fepriv->max_drift = fetunesettings.max_drift;
+		fepriv->step_size = fetunesettings.step_size;
+	} else {
+		/* default values */
+		switch (c->delivery_system) {
+		case SYS_DVBS:
+		case SYS_DVBS2:
+		case SYS_ISDBS:
+		case SYS_TURBO:
+		case SYS_DVBC_ANNEX_A:
+		case SYS_DVBC_ANNEX_C:
+			fepriv->min_delay = HZ / 20;
+			fepriv->step_size = c->symbol_rate / 16000;
+			fepriv->max_drift = c->symbol_rate / 2000;
+			break;
+		case SYS_DVBT:
+		case SYS_DVBT2:
+		case SYS_ISDBT:
+		case SYS_DTMB:
+			fepriv->min_delay = HZ / 20;
+			fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2;
+			fepriv->max_drift = (dvb_frontend_get_stepsize(fe) * 2) + 1;
+			break;
+		default:
+			/*
+			 * FIXME: This sounds wrong! if freqency_stepsize is
+			 * defined by the frontend, why not use it???
+			 */
+			fepriv->min_delay = HZ / 20;
+			fepriv->step_size = 0; /* no zigzag */
+			fepriv->max_drift = 0;
+			break;
+		}
+	}
+	if (dvb_override_tune_delay > 0)
+		fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
+
+	fepriv->state = FESTATE_RETUNE;
+
+	/* Request the search algorithm to search */
+	fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
+
+	dvb_frontend_clear_events(fe);
+	dvb_frontend_add_event(fe, 0);
+	dvb_frontend_wakeup(fe);
+	fepriv->status = 0;
+
+	return 0;
+}
+
+static int dvb_frontend_handle_ioctl(struct file *file,
+				     unsigned int cmd, void *parg)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_frontend *fe = dvbdev->priv;
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+	int i, err = -ENOTSUPP;
+
+	dev_dbg(fe->dvb->device, "%s:\n", __func__);
+
+	switch (cmd) {
+	case FE_SET_PROPERTY: {
+		struct dtv_properties *tvps = parg;
+		struct dtv_property *tvp = NULL;
+
+		dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
+			__func__, tvps->num);
+		dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
+			__func__, tvps->props);
+
+		/*
+		 * Put an arbitrary limit on the number of messages that can
+		 * be sent at once
+		 */
+		if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
+			return -EINVAL;
+
+		tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
+		if (IS_ERR(tvp))
+			return PTR_ERR(tvp);
+
+		for (i = 0; i < tvps->num; i++) {
+			err = dtv_property_process_set(fe, file,
+						       (tvp + i)->cmd,
+						       (tvp + i)->u.data);
+			if (err < 0) {
+				kfree(tvp);
+				return err;
+			}
+		}
+		kfree(tvp);
+		err = 0;
+		break;
+	}
+	case FE_GET_PROPERTY: {
+		struct dtv_properties *tvps = parg;
+		struct dtv_property *tvp = NULL;
+		struct dtv_frontend_properties getp = fe->dtv_property_cache;
+
+		dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
+			__func__, tvps->num);
+		dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
+			__func__, tvps->props);
+
+		/*
+		 * Put an arbitrary limit on the number of messages that can
+		 * be sent at once
+		 */
+		if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
+			return -EINVAL;
+
+		tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
+		if (IS_ERR(tvp))
+			return PTR_ERR(tvp);
+
+		/*
+		 * Let's use our own copy of property cache, in order to
+		 * avoid mangling with DTV zigzag logic, as drivers might
+		 * return crap, if they don't check if the data is available
+		 * before updating the properties cache.
+		 */
+		if (fepriv->state != FESTATE_IDLE) {
+			err = dtv_get_frontend(fe, &getp, NULL);
+			if (err < 0) {
+				kfree(tvp);
+				return err;
+			}
+		}
+		for (i = 0; i < tvps->num; i++) {
+			err = dtv_property_process_get(fe, &getp,
+						       tvp + i, file);
+			if (err < 0) {
+				kfree(tvp);
+				return err;
+			}
+		}
+
+		if (copy_to_user((void __user *)tvps->props, tvp,
+				 tvps->num * sizeof(struct dtv_property))) {
+			kfree(tvp);
+			return -EFAULT;
+		}
+		kfree(tvp);
+		err = 0;
+		break;
+	}
+
+	case FE_GET_INFO: {
+		struct dvb_frontend_info *info = parg;
+		memset(info, 0, sizeof(*info));
+
+		strcpy(info->name, fe->ops.info.name);
+		info->symbol_rate_min = fe->ops.info.symbol_rate_min;
+		info->symbol_rate_max = fe->ops.info.symbol_rate_max;
+		info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
+		info->caps = fe->ops.info.caps;
+		info->frequency_stepsize = dvb_frontend_get_stepsize(fe);
+		dvb_frontend_get_frequency_limits(fe, &info->frequency_min,
+						  &info->frequency_max,
+						  &info->frequency_tolerance);
+
+		/*
+		 * Associate the 4 delivery systems supported by DVBv3
+		 * API with their DVBv5 counterpart. For the other standards,
+		 * use the closest type, assuming that it would hopefully
+		 * work with a DVBv3 application.
+		 * It should be noticed that, on multi-frontend devices with
+		 * different types (terrestrial and cable, for example),
+		 * a pure DVBv3 application won't be able to use all delivery
+		 * systems. Yet, changing the DVBv5 cache to the other delivery
+		 * system should be enough for making it work.
+		 */
+		switch (dvbv3_type(c->delivery_system)) {
+		case DVBV3_QPSK:
+			info->type = FE_QPSK;
+			break;
+		case DVBV3_ATSC:
+			info->type = FE_ATSC;
+			break;
+		case DVBV3_QAM:
+			info->type = FE_QAM;
+			break;
+		case DVBV3_OFDM:
+			info->type = FE_OFDM;
+			break;
+		default:
+			dev_err(fe->dvb->device,
+				"%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
+				__func__, c->delivery_system);
+			info->type = FE_OFDM;
+		}
+		dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
+			__func__, c->delivery_system, info->type);
+
+		/* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
+		if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
+			info->caps |= FE_CAN_INVERSION_AUTO;
+		err = 0;
+		break;
+	}
+
+	case FE_READ_STATUS: {
+		enum fe_status *status = parg;
+
+		/* if retune was requested but hasn't occurred yet, prevent
+		 * that user get signal state from previous tuning */
+		if (fepriv->state == FESTATE_RETUNE ||
+		    fepriv->state == FESTATE_ERROR) {
+			err = 0;
+			*status = 0;
+			break;
+		}
+
+		if (fe->ops.read_status)
+			err = fe->ops.read_status(fe, status);
+		break;
+	}
+
+	case FE_DISEQC_RESET_OVERLOAD:
+		if (fe->ops.diseqc_reset_overload) {
+			err = fe->ops.diseqc_reset_overload(fe);
+			fepriv->state = FESTATE_DISEQC;
+			fepriv->status = 0;
+		}
+		break;
+
+	case FE_DISEQC_SEND_MASTER_CMD:
+		if (fe->ops.diseqc_send_master_cmd) {
+			struct dvb_diseqc_master_cmd *cmd = parg;
+
+			if (cmd->msg_len > sizeof(cmd->msg)) {
+				err = -EINVAL;
+				break;
+			}
+			err = fe->ops.diseqc_send_master_cmd(fe, cmd);
+			fepriv->state = FESTATE_DISEQC;
+			fepriv->status = 0;
+		}
+		break;
+
+	case FE_DISEQC_SEND_BURST:
+		if (fe->ops.diseqc_send_burst) {
+			err = fe->ops.diseqc_send_burst(fe,
+						(enum fe_sec_mini_cmd)parg);
+			fepriv->state = FESTATE_DISEQC;
+			fepriv->status = 0;
+		}
+		break;
+
+	case FE_SET_TONE:
+		if (fe->ops.set_tone) {
+			err = fe->ops.set_tone(fe,
+					       (enum fe_sec_tone_mode)parg);
+			fepriv->tone = (enum fe_sec_tone_mode)parg;
+			fepriv->state = FESTATE_DISEQC;
+			fepriv->status = 0;
+		}
+		break;
+
+	case FE_SET_VOLTAGE:
+		if (fe->ops.set_voltage) {
+			err = fe->ops.set_voltage(fe,
+						  (enum fe_sec_voltage)parg);
+			fepriv->voltage = (enum fe_sec_voltage)parg;
+			fepriv->state = FESTATE_DISEQC;
+			fepriv->status = 0;
+		}
+		break;
+
+	case FE_DISEQC_RECV_SLAVE_REPLY:
+		if (fe->ops.diseqc_recv_slave_reply)
+			err = fe->ops.diseqc_recv_slave_reply(fe, parg);
+		break;
+
+	case FE_ENABLE_HIGH_LNB_VOLTAGE:
+		if (fe->ops.enable_high_lnb_voltage)
+			err = fe->ops.enable_high_lnb_voltage(fe, (long)parg);
+		break;
+
+	case FE_SET_FRONTEND_TUNE_MODE:
+		fepriv->tune_mode_flags = (unsigned long)parg;
+		err = 0;
+		break;
+
+	/* DEPRECATED dish control ioctls */
+
+	case FE_DISHNETWORK_SEND_LEGACY_CMD:
+		if (fe->ops.dishnetwork_send_legacy_command) {
+			err = fe->ops.dishnetwork_send_legacy_command(fe,
+							 (unsigned long)parg);
+			fepriv->state = FESTATE_DISEQC;
+			fepriv->status = 0;
+		} else if (fe->ops.set_voltage) {
+			/*
+			 * NOTE: This is a fallback condition.  Some frontends
+			 * (stv0299 for instance) take longer than 8msec to
+			 * respond to a set_voltage command.  Those switches
+			 * need custom routines to switch properly.  For all
+			 * other frontends, the following should work ok.
+			 * Dish network legacy switches (as used by Dish500)
+			 * are controlled by sending 9-bit command words
+			 * spaced 8msec apart.
+			 * the actual command word is switch/port dependent
+			 * so it is up to the userspace application to send
+			 * the right command.
+			 * The command must always start with a '0' after
+			 * initialization, so parg is 8 bits and does not
+			 * include the initialization or start bit
+			 */
+			unsigned long swcmd = ((unsigned long)parg) << 1;
+			ktime_t nexttime;
+			ktime_t tv[10];
+			int i;
+			u8 last = 1;
+
+			if (dvb_frontend_debug)
+				dprintk("%s switch command: 0x%04lx\n",
+					__func__, swcmd);
+			nexttime = ktime_get_boottime();
+			if (dvb_frontend_debug)
+				tv[0] = nexttime;
+			/* before sending a command, initialize by sending
+			 * a 32ms 18V to the switch
+			 */
+			fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
+			dvb_frontend_sleep_until(&nexttime, 32000);
+
+			for (i = 0; i < 9; i++) {
+				if (dvb_frontend_debug)
+					tv[i + 1] = ktime_get_boottime();
+				if ((swcmd & 0x01) != last) {
+					/* set voltage to (last ? 13V : 18V) */
+					fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
+					last = (last) ? 0 : 1;
+				}
+				swcmd = swcmd >> 1;
+				if (i != 8)
+					dvb_frontend_sleep_until(&nexttime, 8000);
+			}
+			if (dvb_frontend_debug) {
+				dprintk("%s(%d): switch delay (should be 32k followed by all 8k)\n",
+					__func__, fe->dvb->num);
+				for (i = 1; i < 10; i++)
+					pr_info("%d: %d\n", i,
+						(int)ktime_us_delta(tv[i], tv[i - 1]));
+			}
+			err = 0;
+			fepriv->state = FESTATE_DISEQC;
+			fepriv->status = 0;
+		}
+		break;
+
+	/* DEPRECATED statistics ioctls */
+
+	case FE_READ_BER:
+		if (fe->ops.read_ber) {
+			if (fepriv->thread)
+				err = fe->ops.read_ber(fe, parg);
+			else
+				err = -EAGAIN;
+		}
+		break;
+
+	case FE_READ_SIGNAL_STRENGTH:
+		if (fe->ops.read_signal_strength) {
+			if (fepriv->thread)
+				err = fe->ops.read_signal_strength(fe, parg);
+			else
+				err = -EAGAIN;
+		}
+		break;
+
+	case FE_READ_SNR:
+		if (fe->ops.read_snr) {
+			if (fepriv->thread)
+				err = fe->ops.read_snr(fe, parg);
+			else
+				err = -EAGAIN;
+		}
+		break;
+
+	case FE_READ_UNCORRECTED_BLOCKS:
+		if (fe->ops.read_ucblocks) {
+			if (fepriv->thread)
+				err = fe->ops.read_ucblocks(fe, parg);
+			else
+				err = -EAGAIN;
+		}
+		break;
+
+	/* DEPRECATED DVBv3 ioctls */
+
+	case FE_SET_FRONTEND:
+		err = dvbv3_set_delivery_system(fe);
+		if (err)
+			break;
+
+		err = dtv_property_cache_sync(fe, c, parg);
+		if (err)
+			break;
+		err = dtv_set_frontend(fe);
+		break;
+	case FE_GET_EVENT:
+		err = dvb_frontend_get_event(fe, parg, file->f_flags);
+		break;
+
+	case FE_GET_FRONTEND: {
+		struct dtv_frontend_properties getp = fe->dtv_property_cache;
+
+		/*
+		 * Let's use our own copy of property cache, in order to
+		 * avoid mangling with DTV zigzag logic, as drivers might
+		 * return crap, if they don't check if the data is available
+		 * before updating the properties cache.
+		 */
+		err = dtv_get_frontend(fe, &getp, parg);
+		break;
+	}
+
+	default:
+		return -ENOTSUPP;
+	} /* switch */
+
+	return err;
+}
+
+static __poll_t dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_frontend *fe = dvbdev->priv;
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+
+	dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
+
+	poll_wait(file, &fepriv->events.wait_queue, wait);
+
+	if (fepriv->events.eventw != fepriv->events.eventr)
+		return (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
+
+	return 0;
+}
+
+static int dvb_frontend_open(struct inode *inode, struct file *file)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_frontend *fe = dvbdev->priv;
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+	struct dvb_adapter *adapter = fe->dvb;
+	int ret;
+
+	dev_dbg(fe->dvb->device, "%s:\n", __func__);
+	if (fe->exit == DVB_FE_DEVICE_REMOVED)
+		return -ENODEV;
+
+	if (adapter->mfe_shared) {
+		mutex_lock(&adapter->mfe_lock);
+
+		if (!adapter->mfe_dvbdev)
+			adapter->mfe_dvbdev = dvbdev;
+
+		else if (adapter->mfe_dvbdev != dvbdev) {
+			struct dvb_device
+				*mfedev = adapter->mfe_dvbdev;
+			struct dvb_frontend
+				*mfe = mfedev->priv;
+			struct dvb_frontend_private
+				*mfepriv = mfe->frontend_priv;
+			int mferetry = (dvb_mfe_wait_time << 1);
+
+			mutex_unlock(&adapter->mfe_lock);
+			while (mferetry-- && (mfedev->users != -1 ||
+					      mfepriv->thread)) {
+				if (msleep_interruptible(500)) {
+					if (signal_pending(current))
+						return -EINTR;
+				}
+			}
+
+			mutex_lock(&adapter->mfe_lock);
+			if (adapter->mfe_dvbdev != dvbdev) {
+				mfedev = adapter->mfe_dvbdev;
+				mfe = mfedev->priv;
+				mfepriv = mfe->frontend_priv;
+				if (mfedev->users != -1 ||
+				    mfepriv->thread) {
+					mutex_unlock(&adapter->mfe_lock);
+					return -EBUSY;
+				}
+				adapter->mfe_dvbdev = dvbdev;
+			}
+		}
+	}
+
+	if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
+		if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
+			goto err0;
+
+		/* If we took control of the bus, we need to force
+		   reinitialization.  This is because many ts_bus_ctrl()
+		   functions strobe the RESET pin on the demod, and if the
+		   frontend thread already exists then the dvb_init() routine
+		   won't get called (which is what usually does initial
+		   register configuration). */
+		fepriv->reinitialise = 1;
+	}
+
+	if ((ret = dvb_generic_open(inode, file)) < 0)
+		goto err1;
+
+	if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
+		/* normal tune mode when opened R/W */
+		fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
+		fepriv->tone = -1;
+		fepriv->voltage = -1;
+
+#ifdef CONFIG_MEDIA_CONTROLLER_DVB
+		mutex_lock(&fe->dvb->mdev_lock);
+		if (fe->dvb->mdev) {
+			mutex_lock(&fe->dvb->mdev->graph_mutex);
+			if (fe->dvb->mdev->enable_source)
+				ret = fe->dvb->mdev->enable_source(
+							   dvbdev->entity,
+							   &fepriv->pipe);
+			mutex_unlock(&fe->dvb->mdev->graph_mutex);
+			if (ret) {
+				mutex_unlock(&fe->dvb->mdev_lock);
+				dev_err(fe->dvb->device,
+					"Tuner is busy. Error %d\n", ret);
+				goto err2;
+			}
+		}
+		mutex_unlock(&fe->dvb->mdev_lock);
+#endif
+		ret = dvb_frontend_start(fe);
+		if (ret)
+			goto err3;
+
+		/*  empty event queue */
+		fepriv->events.eventr = fepriv->events.eventw = 0;
+	}
+
+	dvb_frontend_get(fe);
+
+	if (adapter->mfe_shared)
+		mutex_unlock(&adapter->mfe_lock);
+	return ret;
+
+err3:
+#ifdef CONFIG_MEDIA_CONTROLLER_DVB
+	mutex_lock(&fe->dvb->mdev_lock);
+	if (fe->dvb->mdev) {
+		mutex_lock(&fe->dvb->mdev->graph_mutex);
+		if (fe->dvb->mdev->disable_source)
+			fe->dvb->mdev->disable_source(dvbdev->entity);
+		mutex_unlock(&fe->dvb->mdev->graph_mutex);
+	}
+	mutex_unlock(&fe->dvb->mdev_lock);
+err2:
+#endif
+	dvb_generic_release(inode, file);
+err1:
+	if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
+		fe->ops.ts_bus_ctrl(fe, 0);
+err0:
+	if (adapter->mfe_shared)
+		mutex_unlock(&adapter->mfe_lock);
+	return ret;
+}
+
+static int dvb_frontend_release(struct inode *inode, struct file *file)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_frontend *fe = dvbdev->priv;
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+	int ret;
+
+	dev_dbg(fe->dvb->device, "%s:\n", __func__);
+
+	if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
+		fepriv->release_jiffies = jiffies;
+		mb();
+	}
+
+	ret = dvb_generic_release(inode, file);
+
+	if (dvbdev->users == -1) {
+		wake_up(&fepriv->wait_queue);
+#ifdef CONFIG_MEDIA_CONTROLLER_DVB
+		mutex_lock(&fe->dvb->mdev_lock);
+		if (fe->dvb->mdev) {
+			mutex_lock(&fe->dvb->mdev->graph_mutex);
+			if (fe->dvb->mdev->disable_source)
+				fe->dvb->mdev->disable_source(dvbdev->entity);
+			mutex_unlock(&fe->dvb->mdev->graph_mutex);
+		}
+		mutex_unlock(&fe->dvb->mdev_lock);
+#endif
+		if (fe->exit != DVB_FE_NO_EXIT)
+			wake_up(&dvbdev->wait_queue);
+		if (fe->ops.ts_bus_ctrl)
+			fe->ops.ts_bus_ctrl(fe, 0);
+	}
+
+	dvb_frontend_put(fe);
+
+	return ret;
+}
+
+static const struct file_operations dvb_frontend_fops = {
+	.owner		= THIS_MODULE,
+	.unlocked_ioctl	= dvb_frontend_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= dvb_frontend_compat_ioctl,
+#endif
+	.poll		= dvb_frontend_poll,
+	.open		= dvb_frontend_open,
+	.release	= dvb_frontend_release,
+	.llseek		= noop_llseek,
+};
+
+int dvb_frontend_suspend(struct dvb_frontend *fe)
+{
+	int ret = 0;
+
+	dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
+		fe->id);
+
+	if (fe->ops.tuner_ops.suspend)
+		ret = fe->ops.tuner_ops.suspend(fe);
+	else if (fe->ops.tuner_ops.sleep)
+		ret = fe->ops.tuner_ops.sleep(fe);
+
+	if (fe->ops.sleep)
+		ret = fe->ops.sleep(fe);
+
+	return ret;
+}
+EXPORT_SYMBOL(dvb_frontend_suspend);
+
+int dvb_frontend_resume(struct dvb_frontend *fe)
+{
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+	int ret = 0;
+
+	dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
+		fe->id);
+
+	fe->exit = DVB_FE_DEVICE_RESUME;
+	if (fe->ops.init)
+		ret = fe->ops.init(fe);
+
+	if (fe->ops.tuner_ops.resume)
+		ret = fe->ops.tuner_ops.resume(fe);
+	else if (fe->ops.tuner_ops.init)
+		ret = fe->ops.tuner_ops.init(fe);
+
+	if (fe->ops.set_tone && fepriv->tone != -1)
+		fe->ops.set_tone(fe, fepriv->tone);
+	if (fe->ops.set_voltage && fepriv->voltage != -1)
+		fe->ops.set_voltage(fe, fepriv->voltage);
+
+	fe->exit = DVB_FE_NO_EXIT;
+	fepriv->state = FESTATE_RETUNE;
+	dvb_frontend_wakeup(fe);
+
+	return ret;
+}
+EXPORT_SYMBOL(dvb_frontend_resume);
+
+int dvb_register_frontend(struct dvb_adapter *dvb,
+			  struct dvb_frontend *fe)
+{
+	struct dvb_frontend_private *fepriv;
+	const struct dvb_device dvbdev_template = {
+		.users = ~0,
+		.writers = 1,
+		.readers = (~0) - 1,
+		.fops = &dvb_frontend_fops,
+#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
+		.name = fe->ops.info.name,
+#endif
+	};
+
+	dev_dbg(dvb->device, "%s:\n", __func__);
+
+	if (mutex_lock_interruptible(&frontend_mutex))
+		return -ERESTARTSYS;
+
+	fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
+	if (!fe->frontend_priv) {
+		mutex_unlock(&frontend_mutex);
+		return -ENOMEM;
+	}
+	fepriv = fe->frontend_priv;
+
+	kref_init(&fe->refcount);
+
+	/*
+	 * After initialization, there need to be two references: one
+	 * for dvb_unregister_frontend(), and another one for
+	 * dvb_frontend_detach().
+	 */
+	dvb_frontend_get(fe);
+
+	sema_init(&fepriv->sem, 1);
+	init_waitqueue_head(&fepriv->wait_queue);
+	init_waitqueue_head(&fepriv->events.wait_queue);
+	mutex_init(&fepriv->events.mtx);
+	fe->dvb = dvb;
+	fepriv->inversion = INVERSION_OFF;
+
+	dev_info(fe->dvb->device,
+		 "DVB: registering adapter %i frontend %i (%s)...\n",
+		 fe->dvb->num, fe->id, fe->ops.info.name);
+
+	dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
+			    fe, DVB_DEVICE_FRONTEND, 0);
+
+	/*
+	 * Initialize the cache to the proper values according with the
+	 * first supported delivery system (ops->delsys[0])
+	 */
+
+	fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
+	dvb_frontend_clear_cache(fe);
+
+	mutex_unlock(&frontend_mutex);
+	return 0;
+}
+EXPORT_SYMBOL(dvb_register_frontend);
+
+int dvb_unregister_frontend(struct dvb_frontend *fe)
+{
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+
+	dev_dbg(fe->dvb->device, "%s:\n", __func__);
+
+	mutex_lock(&frontend_mutex);
+	dvb_frontend_stop(fe);
+	dvb_remove_device(fepriv->dvbdev);
+
+	/* fe is invalid now */
+	mutex_unlock(&frontend_mutex);
+	dvb_frontend_put(fe);
+	return 0;
+}
+EXPORT_SYMBOL(dvb_unregister_frontend);
+
+static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
+					void (*release)(struct dvb_frontend *fe))
+{
+	if (release) {
+		release(fe);
+#ifdef CONFIG_MEDIA_ATTACH
+		dvb_detach(release);
+#endif
+	}
+}
+
+void dvb_frontend_detach(struct dvb_frontend *fe)
+{
+	dvb_frontend_invoke_release(fe, fe->ops.release_sec);
+	dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
+	dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
+	dvb_frontend_put(fe);
+}
+EXPORT_SYMBOL(dvb_frontend_detach);
diff --git a/drivers/media/dvb-core/dvb_math.c b/drivers/media/dvb-core/dvb_math.c
new file mode 100644
index 000000000..dc90564d7
--- /dev/null
+++ b/drivers/media/dvb-core/dvb_math.c
@@ -0,0 +1,141 @@
+/*
+ * dvb-math provides some complex fixed-point math
+ * operations shared between the dvb related stuff
+ *
+ * Copyright (C) 2006 Christoph Pfister (christophpfister@gmail.com)
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ */
+
+#include <linux/bitops.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <asm/bug.h>
+#include <media/dvb_math.h>
+
+static const unsigned short logtable[256] = {
+	0x0000, 0x0171, 0x02e0, 0x044e, 0x05ba, 0x0725, 0x088e, 0x09f7,
+	0x0b5d, 0x0cc3, 0x0e27, 0x0f8a, 0x10eb, 0x124b, 0x13aa, 0x1508,
+	0x1664, 0x17bf, 0x1919, 0x1a71, 0x1bc8, 0x1d1e, 0x1e73, 0x1fc6,
+	0x2119, 0x226a, 0x23ba, 0x2508, 0x2656, 0x27a2, 0x28ed, 0x2a37,
+	0x2b80, 0x2cc8, 0x2e0f, 0x2f54, 0x3098, 0x31dc, 0x331e, 0x345f,
+	0x359f, 0x36de, 0x381b, 0x3958, 0x3a94, 0x3bce, 0x3d08, 0x3e41,
+	0x3f78, 0x40af, 0x41e4, 0x4319, 0x444c, 0x457f, 0x46b0, 0x47e1,
+	0x4910, 0x4a3f, 0x4b6c, 0x4c99, 0x4dc5, 0x4eef, 0x5019, 0x5142,
+	0x526a, 0x5391, 0x54b7, 0x55dc, 0x5700, 0x5824, 0x5946, 0x5a68,
+	0x5b89, 0x5ca8, 0x5dc7, 0x5ee5, 0x6003, 0x611f, 0x623a, 0x6355,
+	0x646f, 0x6588, 0x66a0, 0x67b7, 0x68ce, 0x69e4, 0x6af8, 0x6c0c,
+	0x6d20, 0x6e32, 0x6f44, 0x7055, 0x7165, 0x7274, 0x7383, 0x7490,
+	0x759d, 0x76aa, 0x77b5, 0x78c0, 0x79ca, 0x7ad3, 0x7bdb, 0x7ce3,
+	0x7dea, 0x7ef0, 0x7ff6, 0x80fb, 0x81ff, 0x8302, 0x8405, 0x8507,
+	0x8608, 0x8709, 0x8809, 0x8908, 0x8a06, 0x8b04, 0x8c01, 0x8cfe,
+	0x8dfa, 0x8ef5, 0x8fef, 0x90e9, 0x91e2, 0x92db, 0x93d2, 0x94ca,
+	0x95c0, 0x96b6, 0x97ab, 0x98a0, 0x9994, 0x9a87, 0x9b7a, 0x9c6c,
+	0x9d5e, 0x9e4f, 0x9f3f, 0xa02e, 0xa11e, 0xa20c, 0xa2fa, 0xa3e7,
+	0xa4d4, 0xa5c0, 0xa6ab, 0xa796, 0xa881, 0xa96a, 0xaa53, 0xab3c,
+	0xac24, 0xad0c, 0xadf2, 0xaed9, 0xafbe, 0xb0a4, 0xb188, 0xb26c,
+	0xb350, 0xb433, 0xb515, 0xb5f7, 0xb6d9, 0xb7ba, 0xb89a, 0xb97a,
+	0xba59, 0xbb38, 0xbc16, 0xbcf4, 0xbdd1, 0xbead, 0xbf8a, 0xc065,
+	0xc140, 0xc21b, 0xc2f5, 0xc3cf, 0xc4a8, 0xc580, 0xc658, 0xc730,
+	0xc807, 0xc8de, 0xc9b4, 0xca8a, 0xcb5f, 0xcc34, 0xcd08, 0xcddc,
+	0xceaf, 0xcf82, 0xd054, 0xd126, 0xd1f7, 0xd2c8, 0xd399, 0xd469,
+	0xd538, 0xd607, 0xd6d6, 0xd7a4, 0xd872, 0xd93f, 0xda0c, 0xdad9,
+	0xdba5, 0xdc70, 0xdd3b, 0xde06, 0xded0, 0xdf9a, 0xe063, 0xe12c,
+	0xe1f5, 0xe2bd, 0xe385, 0xe44c, 0xe513, 0xe5d9, 0xe69f, 0xe765,
+	0xe82a, 0xe8ef, 0xe9b3, 0xea77, 0xeb3b, 0xebfe, 0xecc1, 0xed83,
+	0xee45, 0xef06, 0xefc8, 0xf088, 0xf149, 0xf209, 0xf2c8, 0xf387,
+	0xf446, 0xf505, 0xf5c3, 0xf680, 0xf73e, 0xf7fb, 0xf8b7, 0xf973,
+	0xfa2f, 0xfaea, 0xfba5, 0xfc60, 0xfd1a, 0xfdd4, 0xfe8e, 0xff47
+};
+
+unsigned int intlog2(u32 value)
+{
+	/**
+	 *	returns: log2(value) * 2^24
+	 *	wrong result if value = 0 (log2(0) is undefined)
+	 */
+	unsigned int msb;
+	unsigned int logentry;
+	unsigned int significand;
+	unsigned int interpolation;
+
+	if (unlikely(value == 0)) {
+		WARN_ON(1);
+		return 0;
+	}
+
+	/* first detect the msb (count begins at 0) */
+	msb = fls(value) - 1;
+
+	/**
+	 *	now we use a logtable after the following method:
+	 *
+	 *	log2(2^x * y) * 2^24 = x * 2^24 + log2(y) * 2^24
+	 *	where x = msb and therefore 1 <= y < 2
+	 *	first y is determined by shifting the value left
+	 *	so that msb is bit 31
+	 *		0x00231f56 -> 0x8C7D5800
+	 *	the result is y * 2^31 -> "significand"
+	 *	then the highest 9 bits are used for a table lookup
+	 *	the highest bit is discarded because it's always set
+	 *	the highest nine bits in our example are 100011000
+	 *	so we would use the entry 0x18
+	 */
+	significand = value << (31 - msb);
+	logentry = (significand >> 23) & 0xff;
+
+	/**
+	 *	last step we do is interpolation because of the
+	 *	limitations of the log table the error is that part of
+	 *	the significand which isn't used for lookup then we
+	 *	compute the ratio between the error and the next table entry
+	 *	and interpolate it between the log table entry used and the
+	 *	next one the biggest error possible is 0x7fffff
+	 *	(in our example it's 0x7D5800)
+	 *	needed value for next table entry is 0x800000
+	 *	so the interpolation is
+	 *	(error / 0x800000) * (logtable_next - logtable_current)
+	 *	in the implementation the division is moved to the end for
+	 *	better accuracy there is also an overflow correction if
+	 *	logtable_next is 256
+	 */
+	interpolation = ((significand & 0x7fffff) *
+			((logtable[(logentry + 1) & 0xff] -
+			  logtable[logentry]) & 0xffff)) >> 15;
+
+	/* now we return the result */
+	return ((msb << 24) + (logtable[logentry] << 8) + interpolation);
+}
+EXPORT_SYMBOL(intlog2);
+
+unsigned int intlog10(u32 value)
+{
+	/**
+	 *	returns: log10(value) * 2^24
+	 *	wrong result if value = 0 (log10(0) is undefined)
+	 */
+	u64 log;
+
+	if (unlikely(value == 0)) {
+		WARN_ON(1);
+		return 0;
+	}
+
+	log = intlog2(value);
+
+	/**
+	 *	we use the following method:
+	 *	log10(x) = log2(x) * log10(2)
+	 */
+
+	return (log * 646456993) >> 31;
+}
+EXPORT_SYMBOL(intlog10);
diff --git a/drivers/media/dvb-core/dvb_net.c b/drivers/media/dvb-core/dvb_net.c
new file mode 100644
index 000000000..3f154755b
--- /dev/null
+++ b/drivers/media/dvb-core/dvb_net.c
@@ -0,0 +1,1643 @@
+/*
+ * dvb_net.c
+ *
+ * Copyright (C) 2001 Convergence integrated media GmbH
+ *                    Ralph Metzler <ralph@convergence.de>
+ * Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de>
+ *
+ * ULE Decapsulation code:
+ * Copyright (C) 2003, 2004 gcs - Global Communication & Services GmbH.
+ *                      and Department of Scientific Computing
+ *                          Paris Lodron University of Salzburg.
+ *                          Hilmar Linder <hlinder@cosy.sbg.ac.at>
+ *                      and Wolfram Stering <wstering@cosy.sbg.ac.at>
+ *
+ * ULE Decaps according to RFC 4326.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * To obtain the license, point your browser to
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/*
+ * ULE ChangeLog:
+ * Feb 2004: hl/ws v1: Implementing draft-fair-ipdvb-ule-01.txt
+ *
+ * Dec 2004: hl/ws v2: Implementing draft-ietf-ipdvb-ule-03.txt:
+ *                       ULE Extension header handling.
+ *                     Bugreports by Moritz Vieth and Hanno Tersteegen,
+ *                       Fraunhofer Institute for Open Communication Systems
+ *                       Competence Center for Advanced Satellite Communications.
+ *                     Bugfixes and robustness improvements.
+ *                     Filtering on dest MAC addresses, if present (D-Bit = 0)
+ *                     DVB_ULE_DEBUG compile-time option.
+ * Apr 2006: cp v3:    Bugfixes and compliency with RFC 4326 (ULE) by
+ *                       Christian Praehauser <cpraehaus@cosy.sbg.ac.at>,
+ *                       Paris Lodron University of Salzburg.
+ */
+
+/*
+ * FIXME / TODO (dvb_net.c):
+ *
+ * Unloading does not work for 2.6.9 kernels: a refcount doesn't go to zero.
+ *
+ */
+
+#define pr_fmt(fmt) "dvb_net: " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/nospec.h>
+#include <linux/etherdevice.h>
+#include <linux/dvb/net.h>
+#include <linux/uio.h>
+#include <linux/uaccess.h>
+#include <linux/crc32.h>
+#include <linux/mutex.h>
+#include <linux/sched.h>
+
+#include <media/dvb_demux.h>
+#include <media/dvb_net.h>
+
+static inline __u32 iov_crc32( __u32 c, struct kvec *iov, unsigned int cnt )
+{
+	unsigned int j;
+	for (j = 0; j < cnt; j++)
+		c = crc32_be( c, iov[j].iov_base, iov[j].iov_len );
+	return c;
+}
+
+
+#define DVB_NET_MULTICAST_MAX 10
+
+#ifdef DVB_ULE_DEBUG
+/*
+ * The code inside DVB_ULE_DEBUG keeps a history of the
+ * last 100 TS cells processed.
+ */
+static unsigned char ule_hist[100*TS_SZ] = { 0 };
+static unsigned char *ule_where = ule_hist, ule_dump;
+
+static void hexdump(const unsigned char *buf, unsigned short len)
+{
+	print_hex_dump_debug("", DUMP_PREFIX_OFFSET, 16, 1, buf, len, true);
+}
+#endif
+
+struct dvb_net_priv {
+	int in_use;
+	u16 pid;
+	struct net_device *net;
+	struct dvb_net *host;
+	struct dmx_demux *demux;
+	struct dmx_section_feed *secfeed;
+	struct dmx_section_filter *secfilter;
+	struct dmx_ts_feed *tsfeed;
+	int multi_num;
+	struct dmx_section_filter *multi_secfilter[DVB_NET_MULTICAST_MAX];
+	unsigned char multi_macs[DVB_NET_MULTICAST_MAX][6];
+	int rx_mode;
+#define RX_MODE_UNI 0
+#define RX_MODE_MULTI 1
+#define RX_MODE_ALL_MULTI 2
+#define RX_MODE_PROMISC 3
+	struct work_struct set_multicast_list_wq;
+	struct work_struct restart_net_feed_wq;
+	unsigned char feedtype;			/* Either FEED_TYPE_ or FEED_TYPE_ULE */
+	int need_pusi;				/* Set to 1, if synchronization on PUSI required. */
+	unsigned char tscc;			/* TS continuity counter after sync on PUSI. */
+	struct sk_buff *ule_skb;		/* ULE SNDU decodes into this buffer. */
+	unsigned char *ule_next_hdr;		/* Pointer into skb to next ULE extension header. */
+	unsigned short ule_sndu_len;		/* ULE SNDU length in bytes, w/o D-Bit. */
+	unsigned short ule_sndu_type;		/* ULE SNDU type field, complete. */
+	unsigned char ule_sndu_type_1;		/* ULE SNDU type field, if split across 2 TS cells. */
+	unsigned char ule_dbit;			/* Whether the DestMAC address present
+						 * or not (bit is set). */
+	unsigned char ule_bridged;		/* Whether the ULE_BRIDGED extension header was found. */
+	int ule_sndu_remain;			/* Nr. of bytes still required for current ULE SNDU. */
+	unsigned long ts_count;			/* Current ts cell counter. */
+	struct mutex mutex;
+};
+
+
+/*
+ *	Determine the packet's protocol ID. The rule here is that we
+ *	assume 802.3 if the type field is short enough to be a length.
+ *	This is normal practice and works for any 'now in use' protocol.
+ *
+ *  stolen from eth.c out of the linux kernel, hacked for dvb-device
+ *  by Michael Holzt <kju@debian.org>
+ */
+static __be16 dvb_net_eth_type_trans(struct sk_buff *skb,
+				      struct net_device *dev)
+{
+	struct ethhdr *eth;
+	unsigned char *rawp;
+
+	skb_reset_mac_header(skb);
+	skb_pull(skb,dev->hard_header_len);
+	eth = eth_hdr(skb);
+
+	if (*eth->h_dest & 1) {
+		if(ether_addr_equal(eth->h_dest,dev->broadcast))
+			skb->pkt_type=PACKET_BROADCAST;
+		else
+			skb->pkt_type=PACKET_MULTICAST;
+	}
+
+	if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
+		return eth->h_proto;
+
+	rawp = skb->data;
+
+	/*
+	 *	This is a magic hack to spot IPX packets. Older Novell breaks
+	 *	the protocol design and runs IPX over 802.3 without an 802.2 LLC
+	 *	layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
+	 *	won't work for fault tolerant netware but does for the rest.
+	 */
+	if (*(unsigned short *)rawp == 0xFFFF)
+		return htons(ETH_P_802_3);
+
+	/*
+	 *	Real 802.2 LLC
+	 */
+	return htons(ETH_P_802_2);
+}
+
+#define TS_SZ	188
+#define TS_SYNC	0x47
+#define TS_TEI	0x80
+#define TS_SC	0xC0
+#define TS_PUSI	0x40
+#define TS_AF_A	0x20
+#define TS_AF_D	0x10
+
+/* ULE Extension Header handlers. */
+
+#define ULE_TEST	0
+#define ULE_BRIDGED	1
+
+#define ULE_OPTEXTHDR_PADDING 0
+
+static int ule_test_sndu( struct dvb_net_priv *p )
+{
+	return -1;
+}
+
+static int ule_bridged_sndu( struct dvb_net_priv *p )
+{
+	struct ethhdr *hdr = (struct ethhdr*) p->ule_next_hdr;
+	if(ntohs(hdr->h_proto) < ETH_P_802_3_MIN) {
+		int framelen = p->ule_sndu_len - ((p->ule_next_hdr+sizeof(struct ethhdr)) - p->ule_skb->data);
+		/* A frame Type < ETH_P_802_3_MIN for a bridged frame, introduces a LLC Length field. */
+		if(framelen != ntohs(hdr->h_proto)) {
+			return -1;
+		}
+	}
+	/* Note:
+	 * From RFC4326:
+	 *  "A bridged SNDU is a Mandatory Extension Header of Type 1.
+	 *   It must be the final (or only) extension header specified in the header chain of a SNDU."
+	 * The 'ule_bridged' flag will cause the extension header processing loop to terminate.
+	 */
+	p->ule_bridged = 1;
+	return 0;
+}
+
+static int ule_exthdr_padding(struct dvb_net_priv *p)
+{
+	return 0;
+}
+
+/*
+ * Handle ULE extension headers.
+ *  Function is called after a successful CRC32 verification of an ULE SNDU to complete its decoding.
+ *  Returns: >= 0: nr. of bytes consumed by next extension header
+ *	     -1:   Mandatory extension header that is not recognized or TEST SNDU; discard.
+ */
+static int handle_one_ule_extension( struct dvb_net_priv *p )
+{
+	/* Table of mandatory extension header handlers.  The header type is the index. */
+	static int (*ule_mandatory_ext_handlers[255])( struct dvb_net_priv *p ) =
+		{ [0] = ule_test_sndu, [1] = ule_bridged_sndu, [2] = NULL,  };
+
+	/* Table of optional extension header handlers.  The header type is the index. */
+	static int (*ule_optional_ext_handlers[255])( struct dvb_net_priv *p ) =
+		{ [0] = ule_exthdr_padding, [1] = NULL, };
+
+	int ext_len = 0;
+	unsigned char hlen = (p->ule_sndu_type & 0x0700) >> 8;
+	unsigned char htype = p->ule_sndu_type & 0x00FF;
+
+	/* Discriminate mandatory and optional extension headers. */
+	if (hlen == 0) {
+		/* Mandatory extension header */
+		if (ule_mandatory_ext_handlers[htype]) {
+			ext_len = ule_mandatory_ext_handlers[htype]( p );
+			if(ext_len >= 0) {
+				p->ule_next_hdr += ext_len;
+				if (!p->ule_bridged) {
+					p->ule_sndu_type = ntohs(*(__be16 *)p->ule_next_hdr);
+					p->ule_next_hdr += 2;
+				} else {
+					p->ule_sndu_type = ntohs(*(__be16 *)(p->ule_next_hdr + ((p->ule_dbit ? 2 : 3) * ETH_ALEN)));
+					/* This assures the extension handling loop will terminate. */
+				}
+			}
+			// else: extension handler failed or SNDU should be discarded
+		} else
+			ext_len = -1;	/* SNDU has to be discarded. */
+	} else {
+		/* Optional extension header.  Calculate the length. */
+		ext_len = hlen << 1;
+		/* Process the optional extension header according to its type. */
+		if (ule_optional_ext_handlers[htype])
+			(void)ule_optional_ext_handlers[htype]( p );
+		p->ule_next_hdr += ext_len;
+		p->ule_sndu_type = ntohs( *(__be16 *)(p->ule_next_hdr-2) );
+		/*
+		 * note: the length of the next header type is included in the
+		 * length of THIS optional extension header
+		 */
+	}
+
+	return ext_len;
+}
+
+static int handle_ule_extensions( struct dvb_net_priv *p )
+{
+	int total_ext_len = 0, l;
+
+	p->ule_next_hdr = p->ule_skb->data;
+	do {
+		l = handle_one_ule_extension( p );
+		if (l < 0)
+			return l;	/* Stop extension header processing and discard SNDU. */
+		total_ext_len += l;
+		pr_debug("ule_next_hdr=%p, ule_sndu_type=%i, l=%i, total_ext_len=%i\n",
+			 p->ule_next_hdr, (int)p->ule_sndu_type,
+			 l, total_ext_len);
+
+	} while (p->ule_sndu_type < ETH_P_802_3_MIN);
+
+	return total_ext_len;
+}
+
+
+/* Prepare for a new ULE SNDU: reset the decoder state. */
+static inline void reset_ule( struct dvb_net_priv *p )
+{
+	p->ule_skb = NULL;
+	p->ule_next_hdr = NULL;
+	p->ule_sndu_len = 0;
+	p->ule_sndu_type = 0;
+	p->ule_sndu_type_1 = 0;
+	p->ule_sndu_remain = 0;
+	p->ule_dbit = 0xFF;
+	p->ule_bridged = 0;
+}
+
+/*
+ * Decode ULE SNDUs according to draft-ietf-ipdvb-ule-03.txt from a sequence of
+ * TS cells of a single PID.
+ */
+
+struct dvb_net_ule_handle {
+	struct net_device *dev;
+	struct dvb_net_priv *priv;
+	struct ethhdr *ethh;
+	const u8 *buf;
+	size_t buf_len;
+	unsigned long skipped;
+	const u8 *ts, *ts_end, *from_where;
+	u8 ts_remain, how_much, new_ts;
+	bool error;
+};
+
+static int dvb_net_ule_new_ts_cell(struct dvb_net_ule_handle *h)
+{
+	/* We are about to process a new TS cell. */
+
+#ifdef DVB_ULE_DEBUG
+	if (ule_where >= &ule_hist[100*TS_SZ])
+		ule_where = ule_hist;
+	memcpy(ule_where, h->ts, TS_SZ);
+	if (ule_dump) {
+		hexdump(ule_where, TS_SZ);
+		ule_dump = 0;
+	}
+	ule_where += TS_SZ;
+#endif
+
+	/*
+	 * Check TS h->error conditions: sync_byte, transport_error_indicator,
+	 * scrambling_control .
+	 */
+	if ((h->ts[0] != TS_SYNC) || (h->ts[1] & TS_TEI) ||
+	    ((h->ts[3] & TS_SC) != 0)) {
+		pr_warn("%lu: Invalid TS cell: SYNC %#x, TEI %u, SC %#x.\n",
+			h->priv->ts_count, h->ts[0],
+			(h->ts[1] & TS_TEI) >> 7,
+			(h->ts[3] & TS_SC) >> 6);
+
+		/* Drop partly decoded SNDU, reset state, resync on PUSI. */
+		if (h->priv->ule_skb) {
+			dev_kfree_skb(h->priv->ule_skb);
+			/* Prepare for next SNDU. */
+			h->dev->stats.rx_errors++;
+			h->dev->stats.rx_frame_errors++;
+		}
+		reset_ule(h->priv);
+		h->priv->need_pusi = 1;
+
+		/* Continue with next TS cell. */
+		h->ts += TS_SZ;
+		h->priv->ts_count++;
+		return 1;
+	}
+
+	h->ts_remain = 184;
+	h->from_where = h->ts + 4;
+
+	return 0;
+}
+
+static int dvb_net_ule_ts_pusi(struct dvb_net_ule_handle *h)
+{
+	if (h->ts[1] & TS_PUSI) {
+		/* Find beginning of first ULE SNDU in current TS cell. */
+		/* Synchronize continuity counter. */
+		h->priv->tscc = h->ts[3] & 0x0F;
+		/* There is a pointer field here. */
+		if (h->ts[4] > h->ts_remain) {
+			pr_err("%lu: Invalid ULE packet (pointer field %d)\n",
+				h->priv->ts_count, h->ts[4]);
+			h->ts += TS_SZ;
+			h->priv->ts_count++;
+			return 1;
+		}
+		/* Skip to destination of pointer field. */
+		h->from_where = &h->ts[5] + h->ts[4];
+		h->ts_remain -= 1 + h->ts[4];
+		h->skipped = 0;
+	} else {
+		h->skipped++;
+		h->ts += TS_SZ;
+		h->priv->ts_count++;
+		return 1;
+	}
+
+	return 0;
+}
+
+static int dvb_net_ule_new_ts(struct dvb_net_ule_handle *h)
+{
+	/* Check continuity counter. */
+	if ((h->ts[3] & 0x0F) == h->priv->tscc)
+		h->priv->tscc = (h->priv->tscc + 1) & 0x0F;
+	else {
+		/* TS discontinuity handling: */
+		pr_warn("%lu: TS discontinuity: got %#x, expected %#x.\n",
+			h->priv->ts_count, h->ts[3] & 0x0F,
+			h->priv->tscc);
+		/* Drop partly decoded SNDU, reset state, resync on PUSI. */
+		if (h->priv->ule_skb) {
+			dev_kfree_skb(h->priv->ule_skb);
+			/* Prepare for next SNDU. */
+			// reset_ule(h->priv);  moved to below.
+			h->dev->stats.rx_errors++;
+			h->dev->stats.rx_frame_errors++;
+		}
+		reset_ule(h->priv);
+		/* skip to next PUSI. */
+		h->priv->need_pusi = 1;
+		return 1;
+	}
+	/*
+	 * If we still have an incomplete payload, but PUSI is
+	 * set; some TS cells are missing.
+	 * This is only possible here, if we missed exactly 16 TS
+	 * cells (continuity counter wrap).
+	 */
+	if (h->ts[1] & TS_PUSI) {
+		if (!h->priv->need_pusi) {
+			if (!(*h->from_where < (h->ts_remain-1)) ||
+			    *h->from_where != h->priv->ule_sndu_remain) {
+				/*
+				 * Pointer field is invalid.
+				 * Drop this TS cell and any started ULE SNDU.
+				 */
+				pr_warn("%lu: Invalid pointer field: %u.\n",
+					h->priv->ts_count,
+					*h->from_where);
+
+				/*
+				 * Drop partly decoded SNDU, reset state,
+				 * resync on PUSI.
+				 */
+				if (h->priv->ule_skb) {
+					h->error = true;
+					dev_kfree_skb(h->priv->ule_skb);
+				}
+
+				if (h->error || h->priv->ule_sndu_remain) {
+					h->dev->stats.rx_errors++;
+					h->dev->stats.rx_frame_errors++;
+					h->error = false;
+				}
+
+				reset_ule(h->priv);
+				h->priv->need_pusi = 1;
+				return 1;
+			}
+			/*
+			 * Skip pointer field (we're processing a
+			 * packed payload).
+			 */
+			h->from_where += 1;
+			h->ts_remain -= 1;
+		} else
+			h->priv->need_pusi = 0;
+
+		if (h->priv->ule_sndu_remain > 183) {
+			/*
+			 * Current SNDU lacks more data than there
+			 * could be available in the current TS cell.
+			 */
+			h->dev->stats.rx_errors++;
+			h->dev->stats.rx_length_errors++;
+			pr_warn("%lu: Expected %d more SNDU bytes, but got PUSI (pf %d, h->ts_remain %d).  Flushing incomplete payload.\n",
+				h->priv->ts_count,
+				h->priv->ule_sndu_remain,
+				h->ts[4], h->ts_remain);
+			dev_kfree_skb(h->priv->ule_skb);
+			/* Prepare for next SNDU. */
+			reset_ule(h->priv);
+			/*
+			 * Resync: go to where pointer field points to:
+			 * start of next ULE SNDU.
+			 */
+			h->from_where += h->ts[4];
+			h->ts_remain -= h->ts[4];
+		}
+	}
+	return 0;
+}
+
+
+/*
+ * Start a new payload with skb.
+ * Find ULE header.  It is only guaranteed that the
+ * length field (2 bytes) is contained in the current
+ * TS.
+ * Check h.ts_remain has to be >= 2 here.
+ */
+static int dvb_net_ule_new_payload(struct dvb_net_ule_handle *h)
+{
+	if (h->ts_remain < 2) {
+		pr_warn("Invalid payload packing: only %d bytes left in TS.  Resyncing.\n",
+			h->ts_remain);
+		h->priv->ule_sndu_len = 0;
+		h->priv->need_pusi = 1;
+		h->ts += TS_SZ;
+		return 1;
+	}
+
+	if (!h->priv->ule_sndu_len) {
+		/* Got at least two bytes, thus extrace the SNDU length. */
+		h->priv->ule_sndu_len = h->from_where[0] << 8 |
+					h->from_where[1];
+		if (h->priv->ule_sndu_len & 0x8000) {
+			/* D-Bit is set: no dest mac present. */
+			h->priv->ule_sndu_len &= 0x7FFF;
+			h->priv->ule_dbit = 1;
+		} else
+			h->priv->ule_dbit = 0;
+
+		if (h->priv->ule_sndu_len < 5) {
+			pr_warn("%lu: Invalid ULE SNDU length %u. Resyncing.\n",
+				h->priv->ts_count,
+				h->priv->ule_sndu_len);
+			h->dev->stats.rx_errors++;
+			h->dev->stats.rx_length_errors++;
+			h->priv->ule_sndu_len = 0;
+			h->priv->need_pusi = 1;
+			h->new_ts = 1;
+			h->ts += TS_SZ;
+			h->priv->ts_count++;
+			return 1;
+		}
+		h->ts_remain -= 2;	/* consume the 2 bytes SNDU length. */
+		h->from_where += 2;
+	}
+
+	h->priv->ule_sndu_remain = h->priv->ule_sndu_len + 2;
+	/*
+	 * State of current TS:
+	 *   h->ts_remain (remaining bytes in the current TS cell)
+	 *   0	ule_type is not available now, we need the next TS cell
+	 *   1	the first byte of the ule_type is present
+	 * >=2	full ULE header present, maybe some payload data as well.
+	 */
+	switch (h->ts_remain) {
+	case 1:
+		h->priv->ule_sndu_remain--;
+		h->priv->ule_sndu_type = h->from_where[0] << 8;
+
+		/* first byte of ule_type is set. */
+		h->priv->ule_sndu_type_1 = 1;
+		h->ts_remain -= 1;
+		h->from_where += 1;
+		/* fallthrough */
+	case 0:
+		h->new_ts = 1;
+		h->ts += TS_SZ;
+		h->priv->ts_count++;
+		return 1;
+
+	default: /* complete ULE header is present in current TS. */
+		/* Extract ULE type field. */
+		if (h->priv->ule_sndu_type_1) {
+			h->priv->ule_sndu_type_1 = 0;
+			h->priv->ule_sndu_type |= h->from_where[0];
+			h->from_where += 1; /* points to payload start. */
+			h->ts_remain -= 1;
+		} else {
+			/* Complete type is present in new TS. */
+			h->priv->ule_sndu_type = h->from_where[0] << 8 |
+						 h->from_where[1];
+			h->from_where += 2; /* points to payload start. */
+			h->ts_remain -= 2;
+		}
+		break;
+	}
+
+	/*
+	 * Allocate the skb (decoder target buffer) with the correct size,
+	 * as follows:
+	 *
+	 * prepare for the largest case: bridged SNDU with MAC address
+	 * (dbit = 0).
+	 */
+	h->priv->ule_skb = dev_alloc_skb(h->priv->ule_sndu_len +
+					 ETH_HLEN + ETH_ALEN);
+	if (!h->priv->ule_skb) {
+		pr_notice("%s: Memory squeeze, dropping packet.\n",
+			  h->dev->name);
+		h->dev->stats.rx_dropped++;
+		return -1;
+	}
+
+	/* This includes the CRC32 _and_ dest mac, if !dbit. */
+	h->priv->ule_sndu_remain = h->priv->ule_sndu_len;
+	h->priv->ule_skb->dev = h->dev;
+	/*
+	 * Leave space for Ethernet or bridged SNDU header
+	 * (eth hdr plus one MAC addr).
+	 */
+	skb_reserve(h->priv->ule_skb, ETH_HLEN + ETH_ALEN);
+
+	return 0;
+}
+
+
+static int dvb_net_ule_should_drop(struct dvb_net_ule_handle *h)
+{
+	static const u8 bc_addr[ETH_ALEN] = { [0 ... ETH_ALEN - 1] = 0xff };
+
+	/*
+	 * The destination MAC address is the next data in the skb.  It comes
+	 * before any extension headers.
+	 *
+	 * Check if the payload of this SNDU should be passed up the stack.
+	 */
+	if (h->priv->rx_mode == RX_MODE_PROMISC)
+		return 0;
+
+	if (h->priv->ule_skb->data[0] & 0x01) {
+		/* multicast or broadcast */
+		if (!ether_addr_equal(h->priv->ule_skb->data, bc_addr)) {
+			/* multicast */
+			if (h->priv->rx_mode == RX_MODE_MULTI) {
+				int i;
+
+				for (i = 0; i < h->priv->multi_num &&
+				     !ether_addr_equal(h->priv->ule_skb->data,
+						       h->priv->multi_macs[i]);
+				     i++)
+					;
+				if (i == h->priv->multi_num)
+					return 1;
+			} else if (h->priv->rx_mode != RX_MODE_ALL_MULTI)
+				return 1; /* no broadcast; */
+			/*
+			 * else:
+			 * all multicast mode: accept all multicast packets
+			 */
+		}
+		/* else: broadcast */
+	} else if (!ether_addr_equal(h->priv->ule_skb->data, h->dev->dev_addr))
+		return 1;
+
+	return 0;
+}
+
+
+static void dvb_net_ule_check_crc(struct dvb_net_ule_handle *h,
+				  struct kvec iov[3],
+				  u32 ule_crc, u32 expected_crc)
+{
+	u8 dest_addr[ETH_ALEN];
+
+	if (ule_crc != expected_crc) {
+		pr_warn("%lu: CRC32 check FAILED: %08x / %08x, SNDU len %d type %#x, ts_remain %d, next 2: %x.\n",
+			h->priv->ts_count, ule_crc, expected_crc,
+			h->priv->ule_sndu_len, h->priv->ule_sndu_type,
+			h->ts_remain,
+			h->ts_remain > 2 ?
+				*(unsigned short *)h->from_where : 0);
+
+	#ifdef DVB_ULE_DEBUG
+		hexdump(iov[0].iov_base, iov[0].iov_len);
+		hexdump(iov[1].iov_base, iov[1].iov_len);
+		hexdump(iov[2].iov_base, iov[2].iov_len);
+
+		if (ule_where == ule_hist) {
+			hexdump(&ule_hist[98*TS_SZ], TS_SZ);
+			hexdump(&ule_hist[99*TS_SZ], TS_SZ);
+		} else if (ule_where == &ule_hist[TS_SZ]) {
+			hexdump(&ule_hist[99*TS_SZ], TS_SZ);
+			hexdump(ule_hist, TS_SZ);
+		} else {
+			hexdump(ule_where - TS_SZ - TS_SZ, TS_SZ);
+			hexdump(ule_where - TS_SZ, TS_SZ);
+		}
+		ule_dump = 1;
+	#endif
+
+		h->dev->stats.rx_errors++;
+		h->dev->stats.rx_crc_errors++;
+		dev_kfree_skb(h->priv->ule_skb);
+
+		return;
+	}
+
+	/* CRC32 verified OK. */
+
+	/* CRC32 was OK, so remove it from skb. */
+	h->priv->ule_skb->tail -= 4;
+	h->priv->ule_skb->len -= 4;
+
+	if (!h->priv->ule_dbit) {
+		if (dvb_net_ule_should_drop(h)) {
+			netdev_dbg(h->dev,
+				   "Dropping SNDU: MAC destination address does not match: dest addr: %pM, h->dev addr: %pM\n",
+				   h->priv->ule_skb->data, h->dev->dev_addr);
+			dev_kfree_skb(h->priv->ule_skb);
+			return;
+		}
+
+		skb_copy_from_linear_data(h->priv->ule_skb, dest_addr,
+					  ETH_ALEN);
+		skb_pull(h->priv->ule_skb, ETH_ALEN);
+	} else {
+		/* dest_addr buffer is only valid if h->priv->ule_dbit == 0 */
+		eth_zero_addr(dest_addr);
+	}
+
+	/* Handle ULE Extension Headers. */
+	if (h->priv->ule_sndu_type < ETH_P_802_3_MIN) {
+		/* There is an extension header.  Handle it accordingly. */
+		int l = handle_ule_extensions(h->priv);
+
+		if (l < 0) {
+			/*
+			 * Mandatory extension header unknown or TEST SNDU.
+			 * Drop it.
+			 */
+
+			// pr_warn("Dropping SNDU, extension headers.\n" );
+			dev_kfree_skb(h->priv->ule_skb);
+			return;
+		}
+		skb_pull(h->priv->ule_skb, l);
+	}
+
+	/*
+	 * Construct/assure correct ethernet header.
+	 * Note: in bridged mode (h->priv->ule_bridged != 0)
+	 * we already have the (original) ethernet
+	 * header at the start of the payload (after
+	 * optional dest. address and any extension
+	 * headers).
+	 */
+	if (!h->priv->ule_bridged) {
+		skb_push(h->priv->ule_skb, ETH_HLEN);
+		h->ethh = (struct ethhdr *)h->priv->ule_skb->data;
+		memcpy(h->ethh->h_dest, dest_addr, ETH_ALEN);
+		eth_zero_addr(h->ethh->h_source);
+		h->ethh->h_proto = htons(h->priv->ule_sndu_type);
+	}
+	/* else:  skb is in correct state; nothing to do. */
+	h->priv->ule_bridged = 0;
+
+	/* Stuff into kernel's protocol stack. */
+	h->priv->ule_skb->protocol = dvb_net_eth_type_trans(h->priv->ule_skb,
+							   h->dev);
+	/*
+	 * If D-bit is set (i.e. destination MAC address not present),
+	 * receive the packet anyhow.
+	 */
+#if 0
+	if (h->priv->ule_dbit && skb->pkt_type == PACKET_OTHERHOST)
+		h->priv->ule_skb->pkt_type = PACKET_HOST;
+#endif
+	h->dev->stats.rx_packets++;
+	h->dev->stats.rx_bytes += h->priv->ule_skb->len;
+	netif_rx(h->priv->ule_skb);
+}
+
+static void dvb_net_ule(struct net_device *dev, const u8 *buf, size_t buf_len)
+{
+	int ret;
+	struct dvb_net_ule_handle h = {
+		.dev = dev,
+		.priv = netdev_priv(dev),
+		.ethh = NULL,
+		.buf = buf,
+		.buf_len = buf_len,
+		.skipped = 0L,
+		.ts = NULL,
+		.ts_end = NULL,
+		.from_where = NULL,
+		.ts_remain = 0,
+		.how_much = 0,
+		.new_ts = 1,
+		.error = false,
+	};
+
+	/*
+	 * For all TS cells in current buffer.
+	 * Appearently, we are called for every single TS cell.
+	 */
+	for (h.ts = h.buf, h.ts_end = h.buf + h.buf_len;
+	     h.ts < h.ts_end; /* no incr. */) {
+		if (h.new_ts) {
+			/* We are about to process a new TS cell. */
+			if (dvb_net_ule_new_ts_cell(&h))
+				continue;
+		}
+
+		/* Synchronize on PUSI, if required. */
+		if (h.priv->need_pusi) {
+			if (dvb_net_ule_ts_pusi(&h))
+				continue;
+		}
+
+		if (h.new_ts) {
+			if (dvb_net_ule_new_ts(&h))
+				continue;
+		}
+
+		/* Check if new payload needs to be started. */
+		if (h.priv->ule_skb == NULL) {
+			ret = dvb_net_ule_new_payload(&h);
+			if (ret < 0)
+				return;
+			if (ret)
+				continue;
+		}
+
+		/* Copy data into our current skb. */
+		h.how_much = min(h.priv->ule_sndu_remain, (int)h.ts_remain);
+		skb_put_data(h.priv->ule_skb, h.from_where, h.how_much);
+		h.priv->ule_sndu_remain -= h.how_much;
+		h.ts_remain -= h.how_much;
+		h.from_where += h.how_much;
+
+		/* Check for complete payload. */
+		if (h.priv->ule_sndu_remain <= 0) {
+			/* Check CRC32, we've got it in our skb already. */
+			__be16 ulen = htons(h.priv->ule_sndu_len);
+			__be16 utype = htons(h.priv->ule_sndu_type);
+			const u8 *tail;
+			struct kvec iov[3] = {
+				{ &ulen, sizeof ulen },
+				{ &utype, sizeof utype },
+				{ h.priv->ule_skb->data,
+				  h.priv->ule_skb->len - 4 }
+			};
+			u32 ule_crc = ~0L, expected_crc;
+			if (h.priv->ule_dbit) {
+				/* Set D-bit for CRC32 verification,
+				 * if it was set originally. */
+				ulen |= htons(0x8000);
+			}
+
+			ule_crc = iov_crc32(ule_crc, iov, 3);
+			tail = skb_tail_pointer(h.priv->ule_skb);
+			expected_crc = *(tail - 4) << 24 |
+				       *(tail - 3) << 16 |
+				       *(tail - 2) << 8 |
+				       *(tail - 1);
+
+			dvb_net_ule_check_crc(&h, iov, ule_crc, expected_crc);
+
+			/* Prepare for next SNDU. */
+			reset_ule(h.priv);
+		}
+
+		/* More data in current TS (look at the bytes following the CRC32)? */
+		if (h.ts_remain >= 2 && *((unsigned short *)h.from_where) != 0xFFFF) {
+			/* Next ULE SNDU starts right there. */
+			h.new_ts = 0;
+			h.priv->ule_skb = NULL;
+			h.priv->ule_sndu_type_1 = 0;
+			h.priv->ule_sndu_len = 0;
+			// pr_warn("More data in current TS: [%#x %#x %#x %#x]\n",
+			//	*(h.from_where + 0), *(h.from_where + 1),
+			//	*(h.from_where + 2), *(h.from_where + 3));
+			// pr_warn("h.ts @ %p, stopped @ %p:\n", h.ts, h.from_where + 0);
+			// hexdump(h.ts, 188);
+		} else {
+			h.new_ts = 1;
+			h.ts += TS_SZ;
+			h.priv->ts_count++;
+			if (h.priv->ule_skb == NULL) {
+				h.priv->need_pusi = 1;
+				h.priv->ule_sndu_type_1 = 0;
+				h.priv->ule_sndu_len = 0;
+			}
+		}
+	}	/* for all available TS cells */
+}
+
+static int dvb_net_ts_callback(const u8 *buffer1, size_t buffer1_len,
+			       const u8 *buffer2, size_t buffer2_len,
+			       struct dmx_ts_feed *feed,
+			       u32 *buffer_flags)
+{
+	struct net_device *dev = feed->priv;
+
+	if (buffer2)
+		pr_warn("buffer2 not NULL: %p.\n", buffer2);
+	if (buffer1_len > 32768)
+		pr_warn("length > 32k: %zu.\n", buffer1_len);
+	/* pr_info("TS callback: %u bytes, %u TS cells @ %p.\n",
+		  buffer1_len, buffer1_len / TS_SZ, buffer1); */
+	dvb_net_ule(dev, buffer1, buffer1_len);
+	return 0;
+}
+
+
+static void dvb_net_sec(struct net_device *dev,
+			const u8 *pkt, int pkt_len)
+{
+	u8 *eth;
+	struct sk_buff *skb;
+	struct net_device_stats *stats = &dev->stats;
+	int snap = 0;
+
+	/* note: pkt_len includes a 32bit checksum */
+	if (pkt_len < 16) {
+		pr_warn("%s: IP/MPE packet length = %d too small.\n",
+			dev->name, pkt_len);
+		stats->rx_errors++;
+		stats->rx_length_errors++;
+		return;
+	}
+/* it seems some ISPs manage to screw up here, so we have to
+ * relax the error checks... */
+#if 0
+	if ((pkt[5] & 0xfd) != 0xc1) {
+		/* drop scrambled or broken packets */
+#else
+	if ((pkt[5] & 0x3c) != 0x00) {
+		/* drop scrambled */
+#endif
+		stats->rx_errors++;
+		stats->rx_crc_errors++;
+		return;
+	}
+	if (pkt[5] & 0x02) {
+		/* handle LLC/SNAP, see rfc-1042 */
+		if (pkt_len < 24 || memcmp(&pkt[12], "\xaa\xaa\x03\0\0\0", 6)) {
+			stats->rx_dropped++;
+			return;
+		}
+		snap = 8;
+	}
+	if (pkt[7]) {
+		/* FIXME: assemble datagram from multiple sections */
+		stats->rx_errors++;
+		stats->rx_frame_errors++;
+		return;
+	}
+
+	/* we have 14 byte ethernet header (ip header follows);
+	 * 12 byte MPE header; 4 byte checksum; + 2 byte alignment, 8 byte LLC/SNAP
+	 */
+	if (!(skb = dev_alloc_skb(pkt_len - 4 - 12 + 14 + 2 - snap))) {
+		//pr_notice("%s: Memory squeeze, dropping packet.\n", dev->name);
+		stats->rx_dropped++;
+		return;
+	}
+	skb_reserve(skb, 2);    /* longword align L3 header */
+	skb->dev = dev;
+
+	/* copy L3 payload */
+	eth = skb_put(skb, pkt_len - 12 - 4 + 14 - snap);
+	memcpy(eth + 14, pkt + 12 + snap, pkt_len - 12 - 4 - snap);
+
+	/* create ethernet header: */
+	eth[0]=pkt[0x0b];
+	eth[1]=pkt[0x0a];
+	eth[2]=pkt[0x09];
+	eth[3]=pkt[0x08];
+	eth[4]=pkt[0x04];
+	eth[5]=pkt[0x03];
+
+	eth[6]=eth[7]=eth[8]=eth[9]=eth[10]=eth[11]=0;
+
+	if (snap) {
+		eth[12] = pkt[18];
+		eth[13] = pkt[19];
+	} else {
+		/* protocol numbers are from rfc-1700 or
+		 * http://www.iana.org/assignments/ethernet-numbers
+		 */
+		if (pkt[12] >> 4 == 6) { /* version field from IP header */
+			eth[12] = 0x86;	/* IPv6 */
+			eth[13] = 0xdd;
+		} else {
+			eth[12] = 0x08;	/* IPv4 */
+			eth[13] = 0x00;
+		}
+	}
+
+	skb->protocol = dvb_net_eth_type_trans(skb, dev);
+
+	stats->rx_packets++;
+	stats->rx_bytes+=skb->len;
+	netif_rx(skb);
+}
+
+static int dvb_net_sec_callback(const u8 *buffer1, size_t buffer1_len,
+		 const u8 *buffer2, size_t buffer2_len,
+		 struct dmx_section_filter *filter, u32 *buffer_flags)
+{
+	struct net_device *dev = filter->priv;
+
+	/*
+	 * we rely on the DVB API definition where exactly one complete
+	 * section is delivered in buffer1
+	 */
+	dvb_net_sec (dev, buffer1, buffer1_len);
+	return 0;
+}
+
+static netdev_tx_t dvb_net_tx(struct sk_buff *skb, struct net_device *dev)
+{
+	dev_kfree_skb(skb);
+	return NETDEV_TX_OK;
+}
+
+static u8 mask_normal[6]={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+static u8 mask_allmulti[6]={0xff, 0xff, 0xff, 0x00, 0x00, 0x00};
+static u8 mac_allmulti[6]={0x01, 0x00, 0x5e, 0x00, 0x00, 0x00};
+static u8 mask_promisc[6]={0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+
+static int dvb_net_filter_sec_set(struct net_device *dev,
+		   struct dmx_section_filter **secfilter,
+		   u8 *mac, u8 *mac_mask)
+{
+	struct dvb_net_priv *priv = netdev_priv(dev);
+	int ret;
+
+	*secfilter=NULL;
+	ret = priv->secfeed->allocate_filter(priv->secfeed, secfilter);
+	if (ret<0) {
+		pr_err("%s: could not get filter\n", dev->name);
+		return ret;
+	}
+
+	(*secfilter)->priv=(void *) dev;
+
+	memset((*secfilter)->filter_value, 0x00, DMX_MAX_FILTER_SIZE);
+	memset((*secfilter)->filter_mask,  0x00, DMX_MAX_FILTER_SIZE);
+	memset((*secfilter)->filter_mode,  0xff, DMX_MAX_FILTER_SIZE);
+
+	(*secfilter)->filter_value[0]=0x3e;
+	(*secfilter)->filter_value[3]=mac[5];
+	(*secfilter)->filter_value[4]=mac[4];
+	(*secfilter)->filter_value[8]=mac[3];
+	(*secfilter)->filter_value[9]=mac[2];
+	(*secfilter)->filter_value[10]=mac[1];
+	(*secfilter)->filter_value[11]=mac[0];
+
+	(*secfilter)->filter_mask[0] = 0xff;
+	(*secfilter)->filter_mask[3] = mac_mask[5];
+	(*secfilter)->filter_mask[4] = mac_mask[4];
+	(*secfilter)->filter_mask[8] = mac_mask[3];
+	(*secfilter)->filter_mask[9] = mac_mask[2];
+	(*secfilter)->filter_mask[10] = mac_mask[1];
+	(*secfilter)->filter_mask[11]=mac_mask[0];
+
+	netdev_dbg(dev, "filter mac=%pM mask=%pM\n", mac, mac_mask);
+
+	return 0;
+}
+
+static int dvb_net_feed_start(struct net_device *dev)
+{
+	int ret = 0, i;
+	struct dvb_net_priv *priv = netdev_priv(dev);
+	struct dmx_demux *demux = priv->demux;
+	unsigned char *mac = (unsigned char *) dev->dev_addr;
+
+	netdev_dbg(dev, "rx_mode %i\n", priv->rx_mode);
+	mutex_lock(&priv->mutex);
+	if (priv->tsfeed || priv->secfeed || priv->secfilter || priv->multi_secfilter[0])
+		pr_err("%s: BUG %d\n", __func__, __LINE__);
+
+	priv->secfeed=NULL;
+	priv->secfilter=NULL;
+	priv->tsfeed = NULL;
+
+	if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
+		netdev_dbg(dev, "alloc secfeed\n");
+		ret=demux->allocate_section_feed(demux, &priv->secfeed,
+					 dvb_net_sec_callback);
+		if (ret<0) {
+			pr_err("%s: could not allocate section feed\n",
+			       dev->name);
+			goto error;
+		}
+
+		ret = priv->secfeed->set(priv->secfeed, priv->pid, 1);
+
+		if (ret<0) {
+			pr_err("%s: could not set section feed\n", dev->name);
+			priv->demux->release_section_feed(priv->demux, priv->secfeed);
+			priv->secfeed=NULL;
+			goto error;
+		}
+
+		if (priv->rx_mode != RX_MODE_PROMISC) {
+			netdev_dbg(dev, "set secfilter\n");
+			dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_normal);
+		}
+
+		switch (priv->rx_mode) {
+		case RX_MODE_MULTI:
+			for (i = 0; i < priv->multi_num; i++) {
+				netdev_dbg(dev, "set multi_secfilter[%d]\n", i);
+				dvb_net_filter_sec_set(dev, &priv->multi_secfilter[i],
+						       priv->multi_macs[i], mask_normal);
+			}
+			break;
+		case RX_MODE_ALL_MULTI:
+			priv->multi_num=1;
+			netdev_dbg(dev, "set multi_secfilter[0]\n");
+			dvb_net_filter_sec_set(dev, &priv->multi_secfilter[0],
+					       mac_allmulti, mask_allmulti);
+			break;
+		case RX_MODE_PROMISC:
+			priv->multi_num=0;
+			netdev_dbg(dev, "set secfilter\n");
+			dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_promisc);
+			break;
+		}
+
+		netdev_dbg(dev, "start filtering\n");
+		priv->secfeed->start_filtering(priv->secfeed);
+	} else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
+		ktime_t timeout = ns_to_ktime(10 * NSEC_PER_MSEC);
+
+		/* we have payloads encapsulated in TS */
+		netdev_dbg(dev, "alloc tsfeed\n");
+		ret = demux->allocate_ts_feed(demux, &priv->tsfeed, dvb_net_ts_callback);
+		if (ret < 0) {
+			pr_err("%s: could not allocate ts feed\n", dev->name);
+			goto error;
+		}
+
+		/* Set netdevice pointer for ts decaps callback. */
+		priv->tsfeed->priv = (void *)dev;
+		ret = priv->tsfeed->set(priv->tsfeed,
+					priv->pid, /* pid */
+					TS_PACKET, /* type */
+					DMX_PES_OTHER, /* pes type */
+					timeout    /* timeout */
+					);
+
+		if (ret < 0) {
+			pr_err("%s: could not set ts feed\n", dev->name);
+			priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
+			priv->tsfeed = NULL;
+			goto error;
+		}
+
+		netdev_dbg(dev, "start filtering\n");
+		priv->tsfeed->start_filtering(priv->tsfeed);
+	} else
+		ret = -EINVAL;
+
+error:
+	mutex_unlock(&priv->mutex);
+	return ret;
+}
+
+static int dvb_net_feed_stop(struct net_device *dev)
+{
+	struct dvb_net_priv *priv = netdev_priv(dev);
+	int i, ret = 0;
+
+	mutex_lock(&priv->mutex);
+	if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
+		if (priv->secfeed) {
+			if (priv->secfeed->is_filtering) {
+				netdev_dbg(dev, "stop secfeed\n");
+				priv->secfeed->stop_filtering(priv->secfeed);
+			}
+
+			if (priv->secfilter) {
+				netdev_dbg(dev, "release secfilter\n");
+				priv->secfeed->release_filter(priv->secfeed,
+							      priv->secfilter);
+				priv->secfilter=NULL;
+			}
+
+			for (i=0; i<priv->multi_num; i++) {
+				if (priv->multi_secfilter[i]) {
+					netdev_dbg(dev, "release multi_filter[%d]\n",
+						   i);
+					priv->secfeed->release_filter(priv->secfeed,
+								      priv->multi_secfilter[i]);
+					priv->multi_secfilter[i] = NULL;
+				}
+			}
+
+			priv->demux->release_section_feed(priv->demux, priv->secfeed);
+			priv->secfeed = NULL;
+		} else
+			pr_err("%s: no feed to stop\n", dev->name);
+	} else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
+		if (priv->tsfeed) {
+			if (priv->tsfeed->is_filtering) {
+				netdev_dbg(dev, "stop tsfeed\n");
+				priv->tsfeed->stop_filtering(priv->tsfeed);
+			}
+			priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
+			priv->tsfeed = NULL;
+		}
+		else
+			pr_err("%s: no ts feed to stop\n", dev->name);
+	} else
+		ret = -EINVAL;
+	mutex_unlock(&priv->mutex);
+	return ret;
+}
+
+
+static int dvb_set_mc_filter(struct net_device *dev, unsigned char *addr)
+{
+	struct dvb_net_priv *priv = netdev_priv(dev);
+
+	if (priv->multi_num == DVB_NET_MULTICAST_MAX)
+		return -ENOMEM;
+
+	memcpy(priv->multi_macs[priv->multi_num], addr, ETH_ALEN);
+
+	priv->multi_num++;
+	return 0;
+}
+
+
+static void wq_set_multicast_list (struct work_struct *work)
+{
+	struct dvb_net_priv *priv =
+		container_of(work, struct dvb_net_priv, set_multicast_list_wq);
+	struct net_device *dev = priv->net;
+
+	dvb_net_feed_stop(dev);
+	priv->rx_mode = RX_MODE_UNI;
+	netif_addr_lock_bh(dev);
+
+	if (dev->flags & IFF_PROMISC) {
+		netdev_dbg(dev, "promiscuous mode\n");
+		priv->rx_mode = RX_MODE_PROMISC;
+	} else if ((dev->flags & IFF_ALLMULTI)) {
+		netdev_dbg(dev, "allmulti mode\n");
+		priv->rx_mode = RX_MODE_ALL_MULTI;
+	} else if (!netdev_mc_empty(dev)) {
+		struct netdev_hw_addr *ha;
+
+		netdev_dbg(dev, "set_mc_list, %d entries\n",
+			   netdev_mc_count(dev));
+
+		priv->rx_mode = RX_MODE_MULTI;
+		priv->multi_num = 0;
+
+		netdev_for_each_mc_addr(ha, dev)
+			dvb_set_mc_filter(dev, ha->addr);
+	}
+
+	netif_addr_unlock_bh(dev);
+	dvb_net_feed_start(dev);
+}
+
+
+static void dvb_net_set_multicast_list (struct net_device *dev)
+{
+	struct dvb_net_priv *priv = netdev_priv(dev);
+	schedule_work(&priv->set_multicast_list_wq);
+}
+
+
+static void wq_restart_net_feed (struct work_struct *work)
+{
+	struct dvb_net_priv *priv =
+		container_of(work, struct dvb_net_priv, restart_net_feed_wq);
+	struct net_device *dev = priv->net;
+
+	if (netif_running(dev)) {
+		dvb_net_feed_stop(dev);
+		dvb_net_feed_start(dev);
+	}
+}
+
+
+static int dvb_net_set_mac (struct net_device *dev, void *p)
+{
+	struct dvb_net_priv *priv = netdev_priv(dev);
+	struct sockaddr *addr=p;
+
+	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
+
+	if (netif_running(dev))
+		schedule_work(&priv->restart_net_feed_wq);
+
+	return 0;
+}
+
+
+static int dvb_net_open(struct net_device *dev)
+{
+	struct dvb_net_priv *priv = netdev_priv(dev);
+
+	priv->in_use++;
+	dvb_net_feed_start(dev);
+	return 0;
+}
+
+
+static int dvb_net_stop(struct net_device *dev)
+{
+	struct dvb_net_priv *priv = netdev_priv(dev);
+
+	priv->in_use--;
+	return dvb_net_feed_stop(dev);
+}
+
+static const struct header_ops dvb_header_ops = {
+	.create		= eth_header,
+	.parse		= eth_header_parse,
+};
+
+
+static const struct net_device_ops dvb_netdev_ops = {
+	.ndo_open		= dvb_net_open,
+	.ndo_stop		= dvb_net_stop,
+	.ndo_start_xmit		= dvb_net_tx,
+	.ndo_set_rx_mode	= dvb_net_set_multicast_list,
+	.ndo_set_mac_address    = dvb_net_set_mac,
+	.ndo_validate_addr	= eth_validate_addr,
+};
+
+static void dvb_net_setup(struct net_device *dev)
+{
+	ether_setup(dev);
+
+	dev->header_ops		= &dvb_header_ops;
+	dev->netdev_ops		= &dvb_netdev_ops;
+	dev->mtu		= 4096;
+	dev->max_mtu		= 4096;
+
+	dev->flags |= IFF_NOARP;
+}
+
+static int get_if(struct dvb_net *dvbnet)
+{
+	int i;
+
+	for (i=0; i<DVB_NET_DEVICES_MAX; i++)
+		if (!dvbnet->state[i])
+			break;
+
+	if (i == DVB_NET_DEVICES_MAX)
+		return -1;
+
+	dvbnet->state[i]=1;
+	return i;
+}
+
+static int dvb_net_add_if(struct dvb_net *dvbnet, u16 pid, u8 feedtype)
+{
+	struct net_device *net;
+	struct dvb_net_priv *priv;
+	int result;
+	int if_num;
+
+	if (feedtype != DVB_NET_FEEDTYPE_MPE && feedtype != DVB_NET_FEEDTYPE_ULE)
+		return -EINVAL;
+	if ((if_num = get_if(dvbnet)) < 0)
+		return -EINVAL;
+
+	net = alloc_netdev(sizeof(struct dvb_net_priv), "dvb",
+			   NET_NAME_UNKNOWN, dvb_net_setup);
+	if (!net)
+		return -ENOMEM;
+
+	if (dvbnet->dvbdev->id)
+		snprintf(net->name, IFNAMSIZ, "dvb%d%u%d",
+			 dvbnet->dvbdev->adapter->num, dvbnet->dvbdev->id, if_num);
+	else
+		/* compatibility fix to keep dvb0_0 format */
+		snprintf(net->name, IFNAMSIZ, "dvb%d_%d",
+			 dvbnet->dvbdev->adapter->num, if_num);
+
+	net->addr_len = 6;
+	memcpy(net->dev_addr, dvbnet->dvbdev->adapter->proposed_mac, 6);
+
+	dvbnet->device[if_num] = net;
+
+	priv = netdev_priv(net);
+	priv->net = net;
+	priv->demux = dvbnet->demux;
+	priv->pid = pid;
+	priv->rx_mode = RX_MODE_UNI;
+	priv->need_pusi = 1;
+	priv->tscc = 0;
+	priv->feedtype = feedtype;
+	reset_ule(priv);
+
+	INIT_WORK(&priv->set_multicast_list_wq, wq_set_multicast_list);
+	INIT_WORK(&priv->restart_net_feed_wq, wq_restart_net_feed);
+	mutex_init(&priv->mutex);
+
+	net->base_addr = pid;
+
+	if ((result = register_netdev(net)) < 0) {
+		dvbnet->device[if_num] = NULL;
+		free_netdev(net);
+		return result;
+	}
+	pr_info("created network interface %s\n", net->name);
+
+	return if_num;
+}
+
+static int dvb_net_remove_if(struct dvb_net *dvbnet, unsigned long num)
+{
+	struct net_device *net = dvbnet->device[num];
+	struct dvb_net_priv *priv;
+
+	if (!dvbnet->state[num])
+		return -EINVAL;
+	priv = netdev_priv(net);
+	if (priv->in_use)
+		return -EBUSY;
+
+	dvb_net_stop(net);
+	flush_work(&priv->set_multicast_list_wq);
+	flush_work(&priv->restart_net_feed_wq);
+	pr_info("removed network interface %s\n", net->name);
+	unregister_netdev(net);
+	dvbnet->state[num]=0;
+	dvbnet->device[num] = NULL;
+	free_netdev(net);
+
+	return 0;
+}
+
+static int dvb_net_do_ioctl(struct file *file,
+		  unsigned int cmd, void *parg)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_net *dvbnet = dvbdev->priv;
+	int ret = 0;
+
+	if (((file->f_flags&O_ACCMODE)==O_RDONLY))
+		return -EPERM;
+
+	if (mutex_lock_interruptible(&dvbnet->ioctl_mutex))
+		return -ERESTARTSYS;
+
+	switch (cmd) {
+	case NET_ADD_IF:
+	{
+		struct dvb_net_if *dvbnetif = parg;
+		int result;
+
+		if (!capable(CAP_SYS_ADMIN)) {
+			ret = -EPERM;
+			goto ioctl_error;
+		}
+
+		if (!try_module_get(dvbdev->adapter->module)) {
+			ret = -EPERM;
+			goto ioctl_error;
+		}
+
+		result=dvb_net_add_if(dvbnet, dvbnetif->pid, dvbnetif->feedtype);
+		if (result<0) {
+			module_put(dvbdev->adapter->module);
+			ret = result;
+			goto ioctl_error;
+		}
+		dvbnetif->if_num=result;
+		break;
+	}
+	case NET_GET_IF:
+	{
+		struct net_device *netdev;
+		struct dvb_net_priv *priv_data;
+		struct dvb_net_if *dvbnetif = parg;
+		int if_num = dvbnetif->if_num;
+
+		if (if_num >= DVB_NET_DEVICES_MAX) {
+			ret = -EINVAL;
+			goto ioctl_error;
+		}
+		if_num = array_index_nospec(if_num, DVB_NET_DEVICES_MAX);
+
+		if (!dvbnet->state[if_num]) {
+			ret = -EINVAL;
+			goto ioctl_error;
+		}
+
+		netdev = dvbnet->device[if_num];
+
+		priv_data = netdev_priv(netdev);
+		dvbnetif->pid=priv_data->pid;
+		dvbnetif->feedtype=priv_data->feedtype;
+		break;
+	}
+	case NET_REMOVE_IF:
+	{
+		if (!capable(CAP_SYS_ADMIN)) {
+			ret = -EPERM;
+			goto ioctl_error;
+		}
+		if ((unsigned long) parg >= DVB_NET_DEVICES_MAX) {
+			ret = -EINVAL;
+			goto ioctl_error;
+		}
+		ret = dvb_net_remove_if(dvbnet, (unsigned long) parg);
+		if (!ret)
+			module_put(dvbdev->adapter->module);
+		break;
+	}
+
+	/* binary compatibility cruft */
+	case __NET_ADD_IF_OLD:
+	{
+		struct __dvb_net_if_old *dvbnetif = parg;
+		int result;
+
+		if (!capable(CAP_SYS_ADMIN)) {
+			ret = -EPERM;
+			goto ioctl_error;
+		}
+
+		if (!try_module_get(dvbdev->adapter->module)) {
+			ret = -EPERM;
+			goto ioctl_error;
+		}
+
+		result=dvb_net_add_if(dvbnet, dvbnetif->pid, DVB_NET_FEEDTYPE_MPE);
+		if (result<0) {
+			module_put(dvbdev->adapter->module);
+			ret = result;
+			goto ioctl_error;
+		}
+		dvbnetif->if_num=result;
+		break;
+	}
+	case __NET_GET_IF_OLD:
+	{
+		struct net_device *netdev;
+		struct dvb_net_priv *priv_data;
+		struct __dvb_net_if_old *dvbnetif = parg;
+		int if_num = dvbnetif->if_num;
+
+		if (if_num >= DVB_NET_DEVICES_MAX) {
+			ret = -EINVAL;
+			goto ioctl_error;
+		}
+		if_num = array_index_nospec(if_num, DVB_NET_DEVICES_MAX);
+
+		if (!dvbnet->state[if_num]) {
+			ret = -EINVAL;
+			goto ioctl_error;
+		}
+
+		netdev = dvbnet->device[if_num];
+
+		priv_data = netdev_priv(netdev);
+		dvbnetif->pid=priv_data->pid;
+		break;
+	}
+	default:
+		ret = -ENOTTY;
+		break;
+	}
+
+ioctl_error:
+	mutex_unlock(&dvbnet->ioctl_mutex);
+	return ret;
+}
+
+static long dvb_net_ioctl(struct file *file,
+	      unsigned int cmd, unsigned long arg)
+{
+	return dvb_usercopy(file, cmd, arg, dvb_net_do_ioctl);
+}
+
+static int dvb_net_close(struct inode *inode, struct file *file)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_net *dvbnet = dvbdev->priv;
+
+	dvb_generic_release(inode, file);
+
+	if(dvbdev->users == 1 && dvbnet->exit == 1)
+		wake_up(&dvbdev->wait_queue);
+	return 0;
+}
+
+
+static const struct file_operations dvb_net_fops = {
+	.owner = THIS_MODULE,
+	.unlocked_ioctl = dvb_net_ioctl,
+	.open =	dvb_generic_open,
+	.release = dvb_net_close,
+	.llseek = noop_llseek,
+};
+
+static const struct dvb_device dvbdev_net = {
+	.priv = NULL,
+	.users = 1,
+	.writers = 1,
+#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
+	.name = "dvb-net",
+#endif
+	.fops = &dvb_net_fops,
+};
+
+void dvb_net_release (struct dvb_net *dvbnet)
+{
+	int i;
+
+	dvbnet->exit = 1;
+	if (dvbnet->dvbdev->users < 1)
+		wait_event(dvbnet->dvbdev->wait_queue,
+				dvbnet->dvbdev->users==1);
+
+	dvb_unregister_device(dvbnet->dvbdev);
+
+	for (i=0; i<DVB_NET_DEVICES_MAX; i++) {
+		if (!dvbnet->state[i])
+			continue;
+		dvb_net_remove_if(dvbnet, i);
+	}
+}
+EXPORT_SYMBOL(dvb_net_release);
+
+
+int dvb_net_init (struct dvb_adapter *adap, struct dvb_net *dvbnet,
+		  struct dmx_demux *dmx)
+{
+	int i;
+
+	mutex_init(&dvbnet->ioctl_mutex);
+	dvbnet->demux = dmx;
+
+	for (i=0; i<DVB_NET_DEVICES_MAX; i++)
+		dvbnet->state[i] = 0;
+
+	return dvb_register_device(adap, &dvbnet->dvbdev, &dvbdev_net,
+			     dvbnet, DVB_DEVICE_NET, 0);
+}
+EXPORT_SYMBOL(dvb_net_init);
diff --git a/drivers/media/dvb-core/dvb_ringbuffer.c b/drivers/media/dvb-core/dvb_ringbuffer.c
new file mode 100644
index 000000000..d1d471af0
--- /dev/null
+++ b/drivers/media/dvb-core/dvb_ringbuffer.c
@@ -0,0 +1,369 @@
+/*
+ *
+ * dvb_ringbuffer.c: ring buffer implementation for the dvb driver
+ *
+ * Copyright (C) 2003 Oliver Endriss
+ * Copyright (C) 2004 Andrew de Quincey
+ *
+ * based on code originally found in av7110.c & dvb_ci.c:
+ * Copyright (C) 1999-2003 Ralph  Metzler
+ *                       & Marcus Metzler for convergence integrated media GmbH
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ */
+
+
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/uaccess.h>
+
+#include <media/dvb_ringbuffer.h>
+
+#define PKT_READY 0
+#define PKT_DISPOSED 1
+
+
+void dvb_ringbuffer_init(struct dvb_ringbuffer *rbuf, void *data, size_t len)
+{
+	rbuf->pread=rbuf->pwrite=0;
+	rbuf->data=data;
+	rbuf->size=len;
+	rbuf->error=0;
+
+	init_waitqueue_head(&rbuf->queue);
+
+	spin_lock_init(&(rbuf->lock));
+}
+
+
+
+int dvb_ringbuffer_empty(struct dvb_ringbuffer *rbuf)
+{
+	/* smp_load_acquire() to load write pointer on reader side
+	 * this pairs with smp_store_release() in dvb_ringbuffer_write(),
+	 * dvb_ringbuffer_write_user(), or dvb_ringbuffer_reset()
+	 *
+	 * for memory barriers also see Documentation/core-api/circular-buffers.rst
+	 */
+	return (rbuf->pread == smp_load_acquire(&rbuf->pwrite));
+}
+
+
+
+ssize_t dvb_ringbuffer_free(struct dvb_ringbuffer *rbuf)
+{
+	ssize_t free;
+
+	/* READ_ONCE() to load read pointer on writer side
+	 * this pairs with smp_store_release() in dvb_ringbuffer_read(),
+	 * dvb_ringbuffer_read_user(), dvb_ringbuffer_flush(),
+	 * or dvb_ringbuffer_reset()
+	 */
+	free = READ_ONCE(rbuf->pread) - rbuf->pwrite;
+	if (free <= 0)
+		free += rbuf->size;
+	return free-1;
+}
+
+
+
+ssize_t dvb_ringbuffer_avail(struct dvb_ringbuffer *rbuf)
+{
+	ssize_t avail;
+
+	/* smp_load_acquire() to load write pointer on reader side
+	 * this pairs with smp_store_release() in dvb_ringbuffer_write(),
+	 * dvb_ringbuffer_write_user(), or dvb_ringbuffer_reset()
+	 */
+	avail = smp_load_acquire(&rbuf->pwrite) - rbuf->pread;
+	if (avail < 0)
+		avail += rbuf->size;
+	return avail;
+}
+
+
+
+void dvb_ringbuffer_flush(struct dvb_ringbuffer *rbuf)
+{
+	/* dvb_ringbuffer_flush() counts as read operation
+	 * smp_load_acquire() to load write pointer
+	 * smp_store_release() to update read pointer, this ensures that the
+	 * correct pointer is visible for subsequent dvb_ringbuffer_free()
+	 * calls on other cpu cores
+	 */
+	smp_store_release(&rbuf->pread, smp_load_acquire(&rbuf->pwrite));
+	rbuf->error = 0;
+}
+EXPORT_SYMBOL(dvb_ringbuffer_flush);
+
+void dvb_ringbuffer_reset(struct dvb_ringbuffer *rbuf)
+{
+	/* dvb_ringbuffer_reset() counts as read and write operation
+	 * smp_store_release() to update read pointer
+	 */
+	smp_store_release(&rbuf->pread, 0);
+	/* smp_store_release() to update write pointer */
+	smp_store_release(&rbuf->pwrite, 0);
+	rbuf->error = 0;
+}
+
+void dvb_ringbuffer_flush_spinlock_wakeup(struct dvb_ringbuffer *rbuf)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&rbuf->lock, flags);
+	dvb_ringbuffer_flush(rbuf);
+	spin_unlock_irqrestore(&rbuf->lock, flags);
+
+	wake_up(&rbuf->queue);
+}
+
+ssize_t dvb_ringbuffer_read_user(struct dvb_ringbuffer *rbuf, u8 __user *buf, size_t len)
+{
+	size_t todo = len;
+	size_t split;
+
+	split = (rbuf->pread + len > rbuf->size) ? rbuf->size - rbuf->pread : 0;
+	if (split > 0) {
+		if (copy_to_user(buf, rbuf->data+rbuf->pread, split))
+			return -EFAULT;
+		buf += split;
+		todo -= split;
+		/* smp_store_release() for read pointer update to ensure
+		 * that buf is not overwritten until read is complete,
+		 * this pairs with READ_ONCE() in dvb_ringbuffer_free()
+		 */
+		smp_store_release(&rbuf->pread, 0);
+	}
+	if (copy_to_user(buf, rbuf->data+rbuf->pread, todo))
+		return -EFAULT;
+
+	/* smp_store_release() to update read pointer, see above */
+	smp_store_release(&rbuf->pread, (rbuf->pread + todo) % rbuf->size);
+
+	return len;
+}
+
+void dvb_ringbuffer_read(struct dvb_ringbuffer *rbuf, u8 *buf, size_t len)
+{
+	size_t todo = len;
+	size_t split;
+
+	split = (rbuf->pread + len > rbuf->size) ? rbuf->size - rbuf->pread : 0;
+	if (split > 0) {
+		memcpy(buf, rbuf->data+rbuf->pread, split);
+		buf += split;
+		todo -= split;
+		/* smp_store_release() for read pointer update to ensure
+		 * that buf is not overwritten until read is complete,
+		 * this pairs with READ_ONCE() in dvb_ringbuffer_free()
+		 */
+		smp_store_release(&rbuf->pread, 0);
+	}
+	memcpy(buf, rbuf->data+rbuf->pread, todo);
+
+	/* smp_store_release() to update read pointer, see above */
+	smp_store_release(&rbuf->pread, (rbuf->pread + todo) % rbuf->size);
+}
+
+
+ssize_t dvb_ringbuffer_write(struct dvb_ringbuffer *rbuf, const u8 *buf, size_t len)
+{
+	size_t todo = len;
+	size_t split;
+
+	split = (rbuf->pwrite + len > rbuf->size) ? rbuf->size - rbuf->pwrite : 0;
+
+	if (split > 0) {
+		memcpy(rbuf->data+rbuf->pwrite, buf, split);
+		buf += split;
+		todo -= split;
+		/* smp_store_release() for write pointer update to ensure that
+		 * written data is visible on other cpu cores before the pointer
+		 * update, this pairs with smp_load_acquire() in
+		 * dvb_ringbuffer_empty() or dvb_ringbuffer_avail()
+		 */
+		smp_store_release(&rbuf->pwrite, 0);
+	}
+	memcpy(rbuf->data+rbuf->pwrite, buf, todo);
+	/* smp_store_release() for write pointer update, see above */
+	smp_store_release(&rbuf->pwrite, (rbuf->pwrite + todo) % rbuf->size);
+
+	return len;
+}
+
+ssize_t dvb_ringbuffer_write_user(struct dvb_ringbuffer *rbuf,
+				  const u8 __user *buf, size_t len)
+{
+	int status;
+	size_t todo = len;
+	size_t split;
+
+	split = (rbuf->pwrite + len > rbuf->size) ? rbuf->size - rbuf->pwrite : 0;
+
+	if (split > 0) {
+		status = copy_from_user(rbuf->data+rbuf->pwrite, buf, split);
+		if (status)
+			return len - todo;
+		buf += split;
+		todo -= split;
+		/* smp_store_release() for write pointer update to ensure that
+		 * written data is visible on other cpu cores before the pointer
+		 * update, this pairs with smp_load_acquire() in
+		 * dvb_ringbuffer_empty() or dvb_ringbuffer_avail()
+		 */
+		smp_store_release(&rbuf->pwrite, 0);
+	}
+	status = copy_from_user(rbuf->data+rbuf->pwrite, buf, todo);
+	if (status)
+		return len - todo;
+	/* smp_store_release() for write pointer update, see above */
+	smp_store_release(&rbuf->pwrite, (rbuf->pwrite + todo) % rbuf->size);
+
+	return len;
+}
+
+ssize_t dvb_ringbuffer_pkt_write(struct dvb_ringbuffer *rbuf, u8* buf, size_t len)
+{
+	int status;
+	ssize_t oldpwrite = rbuf->pwrite;
+
+	DVB_RINGBUFFER_WRITE_BYTE(rbuf, len >> 8);
+	DVB_RINGBUFFER_WRITE_BYTE(rbuf, len & 0xff);
+	DVB_RINGBUFFER_WRITE_BYTE(rbuf, PKT_READY);
+	status = dvb_ringbuffer_write(rbuf, buf, len);
+
+	if (status < 0) rbuf->pwrite = oldpwrite;
+	return status;
+}
+
+ssize_t dvb_ringbuffer_pkt_read_user(struct dvb_ringbuffer *rbuf, size_t idx,
+				int offset, u8 __user *buf, size_t len)
+{
+	size_t todo;
+	size_t split;
+	size_t pktlen;
+
+	pktlen = rbuf->data[idx] << 8;
+	pktlen |= rbuf->data[(idx + 1) % rbuf->size];
+	if (offset > pktlen) return -EINVAL;
+	if ((offset + len) > pktlen) len = pktlen - offset;
+
+	idx = (idx + DVB_RINGBUFFER_PKTHDRSIZE + offset) % rbuf->size;
+	todo = len;
+	split = ((idx + len) > rbuf->size) ? rbuf->size - idx : 0;
+	if (split > 0) {
+		if (copy_to_user(buf, rbuf->data+idx, split))
+			return -EFAULT;
+		buf += split;
+		todo -= split;
+		idx = 0;
+	}
+	if (copy_to_user(buf, rbuf->data+idx, todo))
+		return -EFAULT;
+
+	return len;
+}
+
+ssize_t dvb_ringbuffer_pkt_read(struct dvb_ringbuffer *rbuf, size_t idx,
+				int offset, u8* buf, size_t len)
+{
+	size_t todo;
+	size_t split;
+	size_t pktlen;
+
+	pktlen = rbuf->data[idx] << 8;
+	pktlen |= rbuf->data[(idx + 1) % rbuf->size];
+	if (offset > pktlen) return -EINVAL;
+	if ((offset + len) > pktlen) len = pktlen - offset;
+
+	idx = (idx + DVB_RINGBUFFER_PKTHDRSIZE + offset) % rbuf->size;
+	todo = len;
+	split = ((idx + len) > rbuf->size) ? rbuf->size - idx : 0;
+	if (split > 0) {
+		memcpy(buf, rbuf->data+idx, split);
+		buf += split;
+		todo -= split;
+		idx = 0;
+	}
+	memcpy(buf, rbuf->data+idx, todo);
+	return len;
+}
+
+void dvb_ringbuffer_pkt_dispose(struct dvb_ringbuffer *rbuf, size_t idx)
+{
+	size_t pktlen;
+
+	rbuf->data[(idx + 2) % rbuf->size] = PKT_DISPOSED;
+
+	// clean up disposed packets
+	while(dvb_ringbuffer_avail(rbuf) > DVB_RINGBUFFER_PKTHDRSIZE) {
+		if (DVB_RINGBUFFER_PEEK(rbuf, 2) == PKT_DISPOSED) {
+			pktlen = DVB_RINGBUFFER_PEEK(rbuf, 0) << 8;
+			pktlen |= DVB_RINGBUFFER_PEEK(rbuf, 1);
+			DVB_RINGBUFFER_SKIP(rbuf, pktlen + DVB_RINGBUFFER_PKTHDRSIZE);
+		} else {
+			// first packet is not disposed, so we stop cleaning now
+			break;
+		}
+	}
+}
+
+ssize_t dvb_ringbuffer_pkt_next(struct dvb_ringbuffer *rbuf, size_t idx, size_t* pktlen)
+{
+	int consumed;
+	int curpktlen;
+	int curpktstatus;
+
+	if (idx == -1) {
+	       idx = rbuf->pread;
+	} else {
+		curpktlen = rbuf->data[idx] << 8;
+		curpktlen |= rbuf->data[(idx + 1) % rbuf->size];
+		idx = (idx + curpktlen + DVB_RINGBUFFER_PKTHDRSIZE) % rbuf->size;
+	}
+
+	consumed = (idx - rbuf->pread) % rbuf->size;
+
+	while((dvb_ringbuffer_avail(rbuf) - consumed) > DVB_RINGBUFFER_PKTHDRSIZE) {
+
+		curpktlen = rbuf->data[idx] << 8;
+		curpktlen |= rbuf->data[(idx + 1) % rbuf->size];
+		curpktstatus = rbuf->data[(idx + 2) % rbuf->size];
+
+		if (curpktstatus == PKT_READY) {
+			*pktlen = curpktlen;
+			return idx;
+		}
+
+		consumed += curpktlen + DVB_RINGBUFFER_PKTHDRSIZE;
+		idx = (idx + curpktlen + DVB_RINGBUFFER_PKTHDRSIZE) % rbuf->size;
+	}
+
+	// no packets available
+	return -1;
+}
+
+
+
+EXPORT_SYMBOL(dvb_ringbuffer_init);
+EXPORT_SYMBOL(dvb_ringbuffer_empty);
+EXPORT_SYMBOL(dvb_ringbuffer_free);
+EXPORT_SYMBOL(dvb_ringbuffer_avail);
+EXPORT_SYMBOL(dvb_ringbuffer_flush_spinlock_wakeup);
+EXPORT_SYMBOL(dvb_ringbuffer_read_user);
+EXPORT_SYMBOL(dvb_ringbuffer_read);
+EXPORT_SYMBOL(dvb_ringbuffer_write);
+EXPORT_SYMBOL(dvb_ringbuffer_write_user);
diff --git a/drivers/media/dvb-core/dvb_vb2.c b/drivers/media/dvb-core/dvb_vb2.c
new file mode 100644
index 000000000..b811adf88
--- /dev/null
+++ b/drivers/media/dvb-core/dvb_vb2.c
@@ -0,0 +1,443 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * dvb-vb2.c - dvb-vb2
+ *
+ * Copyright (C) 2015 Samsung Electronics
+ *
+ * Author: jh1009.sung@samsung.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+
+#include <media/dvbdev.h>
+#include <media/dvb_vb2.h>
+
+#define DVB_V2_MAX_SIZE		(4096 * 188)
+
+static int vb2_debug;
+module_param(vb2_debug, int, 0644);
+
+#define dprintk(level, fmt, arg...)					      \
+	do {								      \
+		if (vb2_debug >= level)					      \
+			pr_info("vb2: %s: " fmt, __func__, ## arg); \
+	} while (0)
+
+static int _queue_setup(struct vb2_queue *vq,
+			unsigned int *nbuffers, unsigned int *nplanes,
+			unsigned int sizes[], struct device *alloc_devs[])
+{
+	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
+
+	ctx->buf_cnt = *nbuffers;
+	*nplanes = 1;
+	sizes[0] = ctx->buf_siz;
+
+	/*
+	 * videobuf2-vmalloc allocator is context-less so no need to set
+	 * alloc_ctxs array.
+	 */
+
+	dprintk(3, "[%s] count=%d, size=%d\n", ctx->name,
+		*nbuffers, sizes[0]);
+
+	return 0;
+}
+
+static int _buffer_prepare(struct vb2_buffer *vb)
+{
+	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+	unsigned long size = ctx->buf_siz;
+
+	if (vb2_plane_size(vb, 0) < size) {
+		dprintk(1, "[%s] data will not fit into plane (%lu < %lu)\n",
+			ctx->name, vb2_plane_size(vb, 0), size);
+		return -EINVAL;
+	}
+
+	vb2_set_plane_payload(vb, 0, size);
+	dprintk(3, "[%s]\n", ctx->name);
+
+	return 0;
+}
+
+static void _buffer_queue(struct vb2_buffer *vb)
+{
+	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+	struct dvb_buffer *buf = container_of(vb, struct dvb_buffer, vb);
+	unsigned long flags = 0;
+
+	spin_lock_irqsave(&ctx->slock, flags);
+	list_add_tail(&buf->list, &ctx->dvb_q);
+	spin_unlock_irqrestore(&ctx->slock, flags);
+
+	dprintk(3, "[%s]\n", ctx->name);
+}
+
+static int _start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
+
+	dprintk(3, "[%s] count=%d\n", ctx->name, count);
+	return 0;
+}
+
+static void _stop_streaming(struct vb2_queue *vq)
+{
+	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
+	struct dvb_buffer *buf;
+	unsigned long flags = 0;
+
+	dprintk(3, "[%s]\n", ctx->name);
+
+	spin_lock_irqsave(&ctx->slock, flags);
+	while (!list_empty(&ctx->dvb_q)) {
+		buf = list_entry(ctx->dvb_q.next,
+				 struct dvb_buffer, list);
+		vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
+		list_del(&buf->list);
+	}
+	spin_unlock_irqrestore(&ctx->slock, flags);
+}
+
+static void _dmxdev_lock(struct vb2_queue *vq)
+{
+	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
+
+	mutex_lock(&ctx->mutex);
+	dprintk(3, "[%s]\n", ctx->name);
+}
+
+static void _dmxdev_unlock(struct vb2_queue *vq)
+{
+	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
+
+	if (mutex_is_locked(&ctx->mutex))
+		mutex_unlock(&ctx->mutex);
+	dprintk(3, "[%s]\n", ctx->name);
+}
+
+static const struct vb2_ops dvb_vb2_qops = {
+	.queue_setup		= _queue_setup,
+	.buf_prepare		= _buffer_prepare,
+	.buf_queue		= _buffer_queue,
+	.start_streaming	= _start_streaming,
+	.stop_streaming		= _stop_streaming,
+	.wait_prepare		= _dmxdev_unlock,
+	.wait_finish		= _dmxdev_lock,
+};
+
+static void _fill_dmx_buffer(struct vb2_buffer *vb, void *pb)
+{
+	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+	struct dmx_buffer *b = pb;
+
+	b->index = vb->index;
+	b->length = vb->planes[0].length;
+	b->bytesused = vb->planes[0].bytesused;
+	b->offset = vb->planes[0].m.offset;
+	dprintk(3, "[%s]\n", ctx->name);
+}
+
+static int _fill_vb2_buffer(struct vb2_buffer *vb,
+			    const void *pb, struct vb2_plane *planes)
+{
+	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+
+	planes[0].bytesused = 0;
+	dprintk(3, "[%s]\n", ctx->name);
+
+	return 0;
+}
+
+static const struct vb2_buf_ops dvb_vb2_buf_ops = {
+	.fill_user_buffer	= _fill_dmx_buffer,
+	.fill_vb2_buffer	= _fill_vb2_buffer,
+};
+
+/*
+ * Videobuf operations
+ */
+int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, int nonblocking)
+{
+	struct vb2_queue *q = &ctx->vb_q;
+	int ret;
+
+	memset(ctx, 0, sizeof(struct dvb_vb2_ctx));
+	q->type = DVB_BUF_TYPE_CAPTURE;
+	/**capture type*/
+	q->is_output = 0;
+	/**only mmap is supported currently*/
+	q->io_modes = VB2_MMAP;
+	q->drv_priv = ctx;
+	q->buf_struct_size = sizeof(struct dvb_buffer);
+	q->min_buffers_needed = 1;
+	q->ops = &dvb_vb2_qops;
+	q->mem_ops = &vb2_vmalloc_memops;
+	q->buf_ops = &dvb_vb2_buf_ops;
+	q->num_buffers = 0;
+	ret = vb2_core_queue_init(q);
+	if (ret) {
+		ctx->state = DVB_VB2_STATE_NONE;
+		dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
+		return ret;
+	}
+
+	mutex_init(&ctx->mutex);
+	spin_lock_init(&ctx->slock);
+	INIT_LIST_HEAD(&ctx->dvb_q);
+
+	strlcpy(ctx->name, name, DVB_VB2_NAME_MAX);
+	ctx->nonblocking = nonblocking;
+	ctx->state = DVB_VB2_STATE_INIT;
+
+	dprintk(3, "[%s]\n", ctx->name);
+
+	return 0;
+}
+
+int dvb_vb2_release(struct dvb_vb2_ctx *ctx)
+{
+	struct vb2_queue *q = (struct vb2_queue *)&ctx->vb_q;
+
+	if (ctx->state & DVB_VB2_STATE_INIT)
+		vb2_core_queue_release(q);
+
+	ctx->state = DVB_VB2_STATE_NONE;
+	dprintk(3, "[%s]\n", ctx->name);
+
+	return 0;
+}
+
+int dvb_vb2_stream_on(struct dvb_vb2_ctx *ctx)
+{
+	struct vb2_queue *q = &ctx->vb_q;
+	int ret;
+
+	ret = vb2_core_streamon(q, q->type);
+	if (ret) {
+		ctx->state = DVB_VB2_STATE_NONE;
+		dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
+		return ret;
+	}
+	ctx->state |= DVB_VB2_STATE_STREAMON;
+	dprintk(3, "[%s]\n", ctx->name);
+
+	return 0;
+}
+
+int dvb_vb2_stream_off(struct dvb_vb2_ctx *ctx)
+{
+	struct vb2_queue *q = (struct vb2_queue *)&ctx->vb_q;
+	int ret;
+
+	ctx->state &= ~DVB_VB2_STATE_STREAMON;
+	ret = vb2_core_streamoff(q, q->type);
+	if (ret) {
+		ctx->state = DVB_VB2_STATE_NONE;
+		dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
+		return ret;
+	}
+	dprintk(3, "[%s]\n", ctx->name);
+
+	return 0;
+}
+
+int dvb_vb2_is_streaming(struct dvb_vb2_ctx *ctx)
+{
+	return (ctx->state & DVB_VB2_STATE_STREAMON);
+}
+
+int dvb_vb2_fill_buffer(struct dvb_vb2_ctx *ctx,
+			const unsigned char *src, int len,
+			enum dmx_buffer_flags *buffer_flags)
+{
+	unsigned long flags = 0;
+	void *vbuf = NULL;
+	int todo = len;
+	unsigned char *psrc = (unsigned char *)src;
+	int ll = 0;
+
+	/*
+	 * normal case: This func is called twice from demux driver
+	 * one with valid src pointer, second time with NULL pointer
+	 */
+	if (!src || !len)
+		return 0;
+	spin_lock_irqsave(&ctx->slock, flags);
+	if (buffer_flags && *buffer_flags) {
+		ctx->flags |= *buffer_flags;
+		*buffer_flags = 0;
+	}
+	while (todo) {
+		if (!ctx->buf) {
+			if (list_empty(&ctx->dvb_q)) {
+				dprintk(3, "[%s] Buffer overflow!!!\n",
+					ctx->name);
+				break;
+			}
+
+			ctx->buf = list_entry(ctx->dvb_q.next,
+					      struct dvb_buffer, list);
+			ctx->remain = vb2_plane_size(&ctx->buf->vb, 0);
+			ctx->offset = 0;
+		}
+
+		if (!dvb_vb2_is_streaming(ctx)) {
+			vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_ERROR);
+			list_del(&ctx->buf->list);
+			ctx->buf = NULL;
+			break;
+		}
+
+		/* Fill buffer */
+		ll = min(todo, ctx->remain);
+		vbuf = vb2_plane_vaddr(&ctx->buf->vb, 0);
+		memcpy(vbuf + ctx->offset, psrc, ll);
+		todo -= ll;
+		psrc += ll;
+
+		ctx->remain -= ll;
+		ctx->offset += ll;
+
+		if (ctx->remain == 0) {
+			vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_DONE);
+			list_del(&ctx->buf->list);
+			ctx->buf = NULL;
+		}
+	}
+
+	if (ctx->nonblocking && ctx->buf) {
+		vb2_set_plane_payload(&ctx->buf->vb, 0, ll);
+		vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_DONE);
+		list_del(&ctx->buf->list);
+		ctx->buf = NULL;
+	}
+	spin_unlock_irqrestore(&ctx->slock, flags);
+
+	if (todo)
+		dprintk(1, "[%s] %d bytes are dropped.\n", ctx->name, todo);
+	else
+		dprintk(3, "[%s]\n", ctx->name);
+
+	dprintk(3, "[%s] %d bytes are copied\n", ctx->name, len - todo);
+	return (len - todo);
+}
+
+int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req)
+{
+	int ret;
+
+	/* Adjust size to a sane value */
+	if (req->size > DVB_V2_MAX_SIZE)
+		req->size = DVB_V2_MAX_SIZE;
+
+	/* FIXME: round req->size to a 188 or 204 multiple */
+
+	ctx->buf_siz = req->size;
+	ctx->buf_cnt = req->count;
+	ret = vb2_core_reqbufs(&ctx->vb_q, VB2_MEMORY_MMAP, &req->count);
+	if (ret) {
+		ctx->state = DVB_VB2_STATE_NONE;
+		dprintk(1, "[%s] count=%d size=%d errno=%d\n", ctx->name,
+			ctx->buf_cnt, ctx->buf_siz, ret);
+		return ret;
+	}
+	ctx->state |= DVB_VB2_STATE_REQBUFS;
+	dprintk(3, "[%s] count=%d size=%d\n", ctx->name,
+		ctx->buf_cnt, ctx->buf_siz);
+
+	return 0;
+}
+
+int dvb_vb2_querybuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
+{
+	vb2_core_querybuf(&ctx->vb_q, b->index, b);
+	dprintk(3, "[%s] index=%d\n", ctx->name, b->index);
+	return 0;
+}
+
+int dvb_vb2_expbuf(struct dvb_vb2_ctx *ctx, struct dmx_exportbuffer *exp)
+{
+	struct vb2_queue *q = &ctx->vb_q;
+	int ret;
+
+	ret = vb2_core_expbuf(&ctx->vb_q, &exp->fd, q->type, exp->index,
+			      0, exp->flags);
+	if (ret) {
+		dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
+			exp->index, ret);
+		return ret;
+	}
+	dprintk(3, "[%s] index=%d fd=%d\n", ctx->name, exp->index, exp->fd);
+
+	return 0;
+}
+
+int dvb_vb2_qbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
+{
+	int ret;
+
+	ret = vb2_core_qbuf(&ctx->vb_q, b->index, b);
+	if (ret) {
+		dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
+			b->index, ret);
+		return ret;
+	}
+	dprintk(5, "[%s] index=%d\n", ctx->name, b->index);
+
+	return 0;
+}
+
+int dvb_vb2_dqbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
+{
+	unsigned long flags;
+	int ret;
+
+	ret = vb2_core_dqbuf(&ctx->vb_q, &b->index, b, ctx->nonblocking);
+	if (ret) {
+		dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
+		return ret;
+	}
+
+	spin_lock_irqsave(&ctx->slock, flags);
+	b->count = ctx->count++;
+	b->flags = ctx->flags;
+	ctx->flags = 0;
+	spin_unlock_irqrestore(&ctx->slock, flags);
+
+	dprintk(5, "[%s] index=%d, count=%d, flags=%d\n",
+		ctx->name, b->index, ctx->count, b->flags);
+
+
+	return 0;
+}
+
+int dvb_vb2_mmap(struct dvb_vb2_ctx *ctx, struct vm_area_struct *vma)
+{
+	int ret;
+
+	ret = vb2_mmap(&ctx->vb_q, vma);
+	if (ret) {
+		dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
+		return ret;
+	}
+	dprintk(3, "[%s] ret=%d\n", ctx->name, ret);
+
+	return 0;
+}
+
+__poll_t dvb_vb2_poll(struct dvb_vb2_ctx *ctx, struct file *file,
+		      poll_table *wait)
+{
+	dprintk(3, "[%s]\n", ctx->name);
+	return vb2_core_poll(&ctx->vb_q, file, wait);
+}
+
diff --git a/drivers/media/dvb-core/dvbdev.c b/drivers/media/dvb-core/dvbdev.c
new file mode 100644
index 000000000..d8f19a4d2
--- /dev/null
+++ b/drivers/media/dvb-core/dvbdev.c
@@ -0,0 +1,1070 @@
+/*
+ * dvbdev.c
+ *
+ * Copyright (C) 2000 Ralph  Metzler <ralph@convergence.de>
+ *                  & Marcus Metzler <marcus@convergence.de>
+ *                    for convergence integrated media GmbH
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#define pr_fmt(fmt) "dvbdev: " fmt
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/mutex.h>
+#include <media/dvbdev.h>
+
+/* Due to enum tuner_pad_index */
+#include <media/tuner.h>
+
+static DEFINE_MUTEX(dvbdev_mutex);
+static int dvbdev_debug;
+
+module_param(dvbdev_debug, int, 0644);
+MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
+
+#define dprintk(fmt, arg...) do {					\
+	if (dvbdev_debug)						\
+		printk(KERN_DEBUG pr_fmt("%s: " fmt),			\
+		       __func__, ##arg);				\
+} while (0)
+
+static LIST_HEAD(dvb_adapter_list);
+static DEFINE_MUTEX(dvbdev_register_lock);
+
+static const char * const dnames[] = {
+	[DVB_DEVICE_VIDEO] =		"video",
+	[DVB_DEVICE_AUDIO] =		"audio",
+	[DVB_DEVICE_SEC] =		"sec",
+	[DVB_DEVICE_FRONTEND] =		"frontend",
+	[DVB_DEVICE_DEMUX] =		"demux",
+	[DVB_DEVICE_DVR] =		"dvr",
+	[DVB_DEVICE_CA] =		"ca",
+	[DVB_DEVICE_NET] =		"net",
+	[DVB_DEVICE_OSD] =		"osd"
+};
+
+#ifdef CONFIG_DVB_DYNAMIC_MINORS
+#define MAX_DVB_MINORS		256
+#define DVB_MAX_IDS		MAX_DVB_MINORS
+#else
+#define DVB_MAX_IDS		4
+
+static const u8 minor_type[] = {
+       [DVB_DEVICE_VIDEO]      = 0,
+       [DVB_DEVICE_AUDIO]      = 1,
+       [DVB_DEVICE_SEC]        = 2,
+       [DVB_DEVICE_FRONTEND]   = 3,
+       [DVB_DEVICE_DEMUX]      = 4,
+       [DVB_DEVICE_DVR]        = 5,
+       [DVB_DEVICE_CA]         = 6,
+       [DVB_DEVICE_NET]        = 7,
+       [DVB_DEVICE_OSD]        = 8,
+};
+
+#define nums2minor(num, type, id) \
+       (((num) << 6) | ((id) << 4) | minor_type[type])
+
+#define MAX_DVB_MINORS		(DVB_MAX_ADAPTERS*64)
+#endif
+
+static struct class *dvb_class;
+
+static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
+static DECLARE_RWSEM(minor_rwsem);
+
+static int dvb_device_open(struct inode *inode, struct file *file)
+{
+	struct dvb_device *dvbdev;
+
+	mutex_lock(&dvbdev_mutex);
+	down_read(&minor_rwsem);
+	dvbdev = dvb_minors[iminor(inode)];
+
+	if (dvbdev && dvbdev->fops) {
+		int err = 0;
+		const struct file_operations *new_fops;
+
+		new_fops = fops_get(dvbdev->fops);
+		if (!new_fops)
+			goto fail;
+		file->private_data = dvbdev;
+		replace_fops(file, new_fops);
+		if (file->f_op->open)
+			err = file->f_op->open(inode, file);
+		up_read(&minor_rwsem);
+		mutex_unlock(&dvbdev_mutex);
+		return err;
+	}
+fail:
+	up_read(&minor_rwsem);
+	mutex_unlock(&dvbdev_mutex);
+	return -ENODEV;
+}
+
+
+static const struct file_operations dvb_device_fops =
+{
+	.owner =	THIS_MODULE,
+	.open =		dvb_device_open,
+	.llseek =	noop_llseek,
+};
+
+static struct cdev dvb_device_cdev;
+
+int dvb_generic_open(struct inode *inode, struct file *file)
+{
+	struct dvb_device *dvbdev = file->private_data;
+
+	if (!dvbdev)
+		return -ENODEV;
+
+	if (!dvbdev->users)
+		return -EBUSY;
+
+	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
+		if (!dvbdev->readers)
+			return -EBUSY;
+		dvbdev->readers--;
+	} else {
+		if (!dvbdev->writers)
+			return -EBUSY;
+		dvbdev->writers--;
+	}
+
+	dvbdev->users--;
+	return 0;
+}
+EXPORT_SYMBOL(dvb_generic_open);
+
+
+int dvb_generic_release(struct inode *inode, struct file *file)
+{
+	struct dvb_device *dvbdev = file->private_data;
+
+	if (!dvbdev)
+		return -ENODEV;
+
+	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
+		dvbdev->readers++;
+	} else {
+		dvbdev->writers++;
+	}
+
+	dvbdev->users++;
+	return 0;
+}
+EXPORT_SYMBOL(dvb_generic_release);
+
+
+long dvb_generic_ioctl(struct file *file,
+		       unsigned int cmd, unsigned long arg)
+{
+	struct dvb_device *dvbdev = file->private_data;
+
+	if (!dvbdev)
+		return -ENODEV;
+
+	if (!dvbdev->kernel_ioctl)
+		return -EINVAL;
+
+	return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
+}
+EXPORT_SYMBOL(dvb_generic_ioctl);
+
+
+static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
+{
+	u32 id = 0;
+
+	while (id < DVB_MAX_IDS) {
+		struct dvb_device *dev;
+		list_for_each_entry(dev, &adap->device_list, list_head)
+			if (dev->type == type && dev->id == id)
+				goto skip;
+		return id;
+skip:
+		id++;
+	}
+	return -ENFILE;
+}
+
+static void dvb_media_device_free(struct dvb_device *dvbdev)
+{
+#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
+	if (dvbdev->entity) {
+		media_device_unregister_entity(dvbdev->entity);
+		kfree(dvbdev->entity);
+		kfree(dvbdev->pads);
+		dvbdev->entity = NULL;
+		dvbdev->pads = NULL;
+	}
+
+	if (dvbdev->tsout_entity) {
+		int i;
+
+		for (i = 0; i < dvbdev->tsout_num_entities; i++) {
+			media_device_unregister_entity(&dvbdev->tsout_entity[i]);
+			kfree(dvbdev->tsout_entity[i].name);
+		}
+		kfree(dvbdev->tsout_entity);
+		kfree(dvbdev->tsout_pads);
+		dvbdev->tsout_entity = NULL;
+		dvbdev->tsout_pads = NULL;
+
+		dvbdev->tsout_num_entities = 0;
+	}
+
+	if (dvbdev->intf_devnode) {
+		media_devnode_remove(dvbdev->intf_devnode);
+		dvbdev->intf_devnode = NULL;
+	}
+
+	if (dvbdev->adapter->conn) {
+		media_device_unregister_entity(dvbdev->adapter->conn);
+		kfree(dvbdev->adapter->conn);
+		dvbdev->adapter->conn = NULL;
+		kfree(dvbdev->adapter->conn_pads);
+		dvbdev->adapter->conn_pads = NULL;
+	}
+#endif
+}
+
+#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
+static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
+				    const char *name, int npads)
+{
+	int i, ret = 0;
+
+	dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
+				     GFP_KERNEL);
+	if (!dvbdev->tsout_pads)
+		return -ENOMEM;
+
+	dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
+				       GFP_KERNEL);
+	if (!dvbdev->tsout_entity)
+		return -ENOMEM;
+
+	dvbdev->tsout_num_entities = npads;
+
+	for (i = 0; i < npads; i++) {
+		struct media_pad *pads = &dvbdev->tsout_pads[i];
+		struct media_entity *entity = &dvbdev->tsout_entity[i];
+
+		entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
+		if (!entity->name)
+			return -ENOMEM;
+
+		entity->function = MEDIA_ENT_F_IO_DTV;
+		pads->flags = MEDIA_PAD_FL_SINK;
+
+		ret = media_entity_pads_init(entity, 1, pads);
+		if (ret < 0)
+			return ret;
+
+		ret = media_device_register_entity(dvbdev->adapter->mdev,
+						   entity);
+		if (ret < 0)
+			return ret;
+	}
+	return 0;
+}
+
+#define DEMUX_TSOUT	"demux-tsout"
+#define DVR_TSOUT	"dvr-tsout"
+
+static int dvb_create_media_entity(struct dvb_device *dvbdev,
+				   int type, int demux_sink_pads)
+{
+	int i, ret, npads;
+
+	switch (type) {
+	case DVB_DEVICE_FRONTEND:
+		npads = 2;
+		break;
+	case DVB_DEVICE_DVR:
+		ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
+					      demux_sink_pads);
+		return ret;
+	case DVB_DEVICE_DEMUX:
+		npads = 1 + demux_sink_pads;
+		ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
+					      demux_sink_pads);
+		if (ret < 0)
+			return ret;
+		break;
+	case DVB_DEVICE_CA:
+		npads = 2;
+		break;
+	case DVB_DEVICE_NET:
+		/*
+		 * We should be creating entities for the MPE/ULE
+		 * decapsulation hardware (or software implementation).
+		 *
+		 * However, the number of for the MPE/ULE decaps may not be
+		 * fixed. As we don't have yet dynamic support for PADs at
+		 * the Media Controller, let's not create the decap
+		 * entities yet.
+		 */
+		return 0;
+	default:
+		return 0;
+	}
+
+	dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
+	if (!dvbdev->entity)
+		return -ENOMEM;
+
+	dvbdev->entity->name = dvbdev->name;
+
+	if (npads) {
+		dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
+				       GFP_KERNEL);
+		if (!dvbdev->pads) {
+			kfree(dvbdev->entity);
+			return -ENOMEM;
+		}
+	}
+
+	switch (type) {
+	case DVB_DEVICE_FRONTEND:
+		dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
+		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
+		dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
+		break;
+	case DVB_DEVICE_DEMUX:
+		dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
+		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
+		for (i = 1; i < npads; i++)
+			dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
+		break;
+	case DVB_DEVICE_CA:
+		dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
+		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
+		dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
+		break;
+	default:
+		/* Should never happen, as the first switch prevents it */
+		kfree(dvbdev->entity);
+		kfree(dvbdev->pads);
+		dvbdev->entity = NULL;
+		dvbdev->pads = NULL;
+		return 0;
+	}
+
+	if (npads) {
+		ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
+		if (ret)
+			return ret;
+	}
+	ret = media_device_register_entity(dvbdev->adapter->mdev,
+					   dvbdev->entity);
+	if (ret)
+		return ret;
+
+	pr_info("%s: media entity '%s' registered.\n",
+		__func__, dvbdev->entity->name);
+
+	return 0;
+}
+#endif
+
+static int dvb_register_media_device(struct dvb_device *dvbdev,
+				     int type, int minor,
+				     unsigned demux_sink_pads)
+{
+#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
+	struct media_link *link;
+	u32 intf_type;
+	int ret;
+
+	if (!dvbdev->adapter->mdev)
+		return 0;
+
+	ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
+	if (ret)
+		return ret;
+
+	switch (type) {
+	case DVB_DEVICE_FRONTEND:
+		intf_type = MEDIA_INTF_T_DVB_FE;
+		break;
+	case DVB_DEVICE_DEMUX:
+		intf_type = MEDIA_INTF_T_DVB_DEMUX;
+		break;
+	case DVB_DEVICE_DVR:
+		intf_type = MEDIA_INTF_T_DVB_DVR;
+		break;
+	case DVB_DEVICE_CA:
+		intf_type = MEDIA_INTF_T_DVB_CA;
+		break;
+	case DVB_DEVICE_NET:
+		intf_type = MEDIA_INTF_T_DVB_NET;
+		break;
+	default:
+		return 0;
+	}
+
+	dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
+						    intf_type, 0,
+						    DVB_MAJOR, minor);
+
+	if (!dvbdev->intf_devnode)
+		return -ENOMEM;
+
+	/*
+	 * Create the "obvious" link, e. g. the ones that represent
+	 * a direct association between an interface and an entity.
+	 * Other links should be created elsewhere, like:
+	 *		DVB FE intf    -> tuner
+	 *		DVB demux intf -> dvr
+	 */
+
+	if (!dvbdev->entity)
+		return 0;
+
+	link = media_create_intf_link(dvbdev->entity,
+				      &dvbdev->intf_devnode->intf,
+				      MEDIA_LNK_FL_ENABLED |
+				      MEDIA_LNK_FL_IMMUTABLE);
+	if (!link)
+		return -ENOMEM;
+#endif
+	return 0;
+}
+
+int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
+			const struct dvb_device *template, void *priv,
+			enum dvb_device_type type, int demux_sink_pads)
+{
+	struct dvb_device *dvbdev;
+	struct file_operations *dvbdevfops;
+	struct device *clsdev;
+	int minor;
+	int id, ret;
+
+	mutex_lock(&dvbdev_register_lock);
+
+	if ((id = dvbdev_get_free_id (adap, type)) < 0){
+		mutex_unlock(&dvbdev_register_lock);
+		*pdvbdev = NULL;
+		pr_err("%s: couldn't find free device id\n", __func__);
+		return -ENFILE;
+	}
+
+	*pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
+
+	if (!dvbdev){
+		mutex_unlock(&dvbdev_register_lock);
+		return -ENOMEM;
+	}
+
+	dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
+
+	if (!dvbdevfops){
+		kfree (dvbdev);
+		mutex_unlock(&dvbdev_register_lock);
+		return -ENOMEM;
+	}
+
+	memcpy(dvbdev, template, sizeof(struct dvb_device));
+	dvbdev->type = type;
+	dvbdev->id = id;
+	dvbdev->adapter = adap;
+	dvbdev->priv = priv;
+	dvbdev->fops = dvbdevfops;
+	init_waitqueue_head (&dvbdev->wait_queue);
+
+	memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
+	dvbdevfops->owner = adap->module;
+
+	list_add_tail (&dvbdev->list_head, &adap->device_list);
+
+	down_write(&minor_rwsem);
+#ifdef CONFIG_DVB_DYNAMIC_MINORS
+	for (minor = 0; minor < MAX_DVB_MINORS; minor++)
+		if (dvb_minors[minor] == NULL)
+			break;
+
+	if (minor == MAX_DVB_MINORS) {
+		kfree(dvbdevfops);
+		kfree(dvbdev);
+		up_write(&minor_rwsem);
+		mutex_unlock(&dvbdev_register_lock);
+		return -EINVAL;
+	}
+#else
+	minor = nums2minor(adap->num, type, id);
+#endif
+
+	dvbdev->minor = minor;
+	dvb_minors[minor] = dvbdev;
+	up_write(&minor_rwsem);
+
+	ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
+	if (ret) {
+		pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
+		      __func__);
+
+		dvb_media_device_free(dvbdev);
+		kfree(dvbdevfops);
+		kfree(dvbdev);
+		up_write(&minor_rwsem);
+		mutex_unlock(&dvbdev_register_lock);
+		return ret;
+	}
+
+	mutex_unlock(&dvbdev_register_lock);
+
+	clsdev = device_create(dvb_class, adap->device,
+			       MKDEV(DVB_MAJOR, minor),
+			       dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
+	if (IS_ERR(clsdev)) {
+		pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
+		       __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
+		return PTR_ERR(clsdev);
+	}
+	dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
+		adap->num, dnames[type], id, minor, minor);
+
+	return 0;
+}
+EXPORT_SYMBOL(dvb_register_device);
+
+
+void dvb_remove_device(struct dvb_device *dvbdev)
+{
+	if (!dvbdev)
+		return;
+
+	down_write(&minor_rwsem);
+	dvb_minors[dvbdev->minor] = NULL;
+	up_write(&minor_rwsem);
+
+	dvb_media_device_free(dvbdev);
+
+	device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
+
+	list_del (&dvbdev->list_head);
+}
+EXPORT_SYMBOL(dvb_remove_device);
+
+
+void dvb_free_device(struct dvb_device *dvbdev)
+{
+	if (!dvbdev)
+		return;
+
+	kfree (dvbdev->fops);
+	kfree (dvbdev);
+}
+EXPORT_SYMBOL(dvb_free_device);
+
+
+void dvb_unregister_device(struct dvb_device *dvbdev)
+{
+	dvb_remove_device(dvbdev);
+	dvb_free_device(dvbdev);
+}
+EXPORT_SYMBOL(dvb_unregister_device);
+
+
+#ifdef CONFIG_MEDIA_CONTROLLER_DVB
+
+static int dvb_create_io_intf_links(struct dvb_adapter *adap,
+				    struct media_interface *intf,
+				    char *name)
+{
+	struct media_device *mdev = adap->mdev;
+	struct media_entity *entity;
+	struct media_link *link;
+
+	media_device_for_each_entity(entity, mdev) {
+		if (entity->function == MEDIA_ENT_F_IO_DTV) {
+			if (strncmp(entity->name, name, strlen(name)))
+				continue;
+			link = media_create_intf_link(entity, intf,
+						      MEDIA_LNK_FL_ENABLED |
+						      MEDIA_LNK_FL_IMMUTABLE);
+			if (!link)
+				return -ENOMEM;
+		}
+	}
+	return 0;
+}
+
+int dvb_create_media_graph(struct dvb_adapter *adap,
+			   bool create_rf_connector)
+{
+	struct media_device *mdev = adap->mdev;
+	struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
+	struct media_entity *demux = NULL, *ca = NULL;
+	struct media_link *link;
+	struct media_interface *intf;
+	unsigned demux_pad = 0;
+	unsigned dvr_pad = 0;
+	unsigned ntuner = 0, ndemod = 0;
+	int ret;
+	static const char *connector_name = "Television";
+
+	if (!mdev)
+		return 0;
+
+	media_device_for_each_entity(entity, mdev) {
+		switch (entity->function) {
+		case MEDIA_ENT_F_TUNER:
+			tuner = entity;
+			ntuner++;
+			break;
+		case MEDIA_ENT_F_DTV_DEMOD:
+			demod = entity;
+			ndemod++;
+			break;
+		case MEDIA_ENT_F_TS_DEMUX:
+			demux = entity;
+			break;
+		case MEDIA_ENT_F_DTV_CA:
+			ca = entity;
+			break;
+		}
+	}
+
+	/*
+	 * Prepare to signalize to media_create_pad_links() that multiple
+	 * entities of the same type exists and a 1:n or n:1 links need to be
+	 * created.
+	 * NOTE: if both tuner and demod have multiple instances, it is up
+	 * to the caller driver to create such links.
+	 */
+	if (ntuner > 1)
+		tuner = NULL;
+	if (ndemod > 1)
+		demod = NULL;
+
+	if (create_rf_connector) {
+		conn = kzalloc(sizeof(*conn), GFP_KERNEL);
+		if (!conn)
+			return -ENOMEM;
+		adap->conn = conn;
+
+		adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
+		if (!adap->conn_pads)
+			return -ENOMEM;
+
+		conn->flags = MEDIA_ENT_FL_CONNECTOR;
+		conn->function = MEDIA_ENT_F_CONN_RF;
+		conn->name = connector_name;
+		adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
+
+		ret = media_entity_pads_init(conn, 1, adap->conn_pads);
+		if (ret)
+			return ret;
+
+		ret = media_device_register_entity(mdev, conn);
+		if (ret)
+			return ret;
+
+		if (!ntuner)
+			ret = media_create_pad_links(mdev,
+						     MEDIA_ENT_F_CONN_RF,
+						     conn, 0,
+						     MEDIA_ENT_F_DTV_DEMOD,
+						     demod, 0,
+						     MEDIA_LNK_FL_ENABLED,
+						     false);
+		else
+			ret = media_create_pad_links(mdev,
+						     MEDIA_ENT_F_CONN_RF,
+						     conn, 0,
+						     MEDIA_ENT_F_TUNER,
+						     tuner, TUNER_PAD_RF_INPUT,
+						     MEDIA_LNK_FL_ENABLED,
+						     false);
+		if (ret)
+			return ret;
+	}
+
+	if (ntuner && ndemod) {
+		ret = media_create_pad_links(mdev,
+					     MEDIA_ENT_F_TUNER,
+					     tuner, TUNER_PAD_OUTPUT,
+					     MEDIA_ENT_F_DTV_DEMOD,
+					     demod, 0, MEDIA_LNK_FL_ENABLED,
+					     false);
+		if (ret)
+			return ret;
+	}
+
+	if (ndemod && demux) {
+		ret = media_create_pad_links(mdev,
+					     MEDIA_ENT_F_DTV_DEMOD,
+					     demod, 1,
+					     MEDIA_ENT_F_TS_DEMUX,
+					     demux, 0, MEDIA_LNK_FL_ENABLED,
+					     false);
+		if (ret)
+			return ret;
+	}
+	if (demux && ca) {
+		ret = media_create_pad_link(demux, 1, ca,
+					    0, MEDIA_LNK_FL_ENABLED);
+		if (ret)
+			return ret;
+	}
+
+	/* Create demux links for each ringbuffer/pad */
+	if (demux) {
+		media_device_for_each_entity(entity, mdev) {
+			if (entity->function == MEDIA_ENT_F_IO_DTV) {
+				if (!strncmp(entity->name, DVR_TSOUT,
+				    strlen(DVR_TSOUT))) {
+					ret = media_create_pad_link(demux,
+								++dvr_pad,
+							    entity, 0, 0);
+					if (ret)
+						return ret;
+				}
+				if (!strncmp(entity->name, DEMUX_TSOUT,
+				    strlen(DEMUX_TSOUT))) {
+					ret = media_create_pad_link(demux,
+							      ++demux_pad,
+							    entity, 0, 0);
+					if (ret)
+						return ret;
+				}
+			}
+		}
+	}
+
+	/* Create interface links for FE->tuner, DVR->demux and CA->ca */
+	media_device_for_each_intf(intf, mdev) {
+		if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
+			link = media_create_intf_link(ca, intf,
+						      MEDIA_LNK_FL_ENABLED |
+						      MEDIA_LNK_FL_IMMUTABLE);
+			if (!link)
+				return -ENOMEM;
+		}
+
+		if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
+			link = media_create_intf_link(tuner, intf,
+						      MEDIA_LNK_FL_ENABLED |
+						      MEDIA_LNK_FL_IMMUTABLE);
+			if (!link)
+				return -ENOMEM;
+		}
+#if 0
+		/*
+		 * Indirect link - let's not create yet, as we don't know how
+		 *		   to handle indirect links, nor if this will
+		 *		   actually be needed.
+		 */
+		if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
+			link = media_create_intf_link(demux, intf,
+						      MEDIA_LNK_FL_ENABLED |
+						      MEDIA_LNK_FL_IMMUTABLE);
+			if (!link)
+				return -ENOMEM;
+		}
+#endif
+		if (intf->type == MEDIA_INTF_T_DVB_DVR) {
+			ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
+			if (ret)
+				return ret;
+		}
+		if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
+			ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
+			if (ret)
+				return ret;
+		}
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dvb_create_media_graph);
+#endif
+
+static int dvbdev_check_free_adapter_num(int num)
+{
+	struct list_head *entry;
+	list_for_each(entry, &dvb_adapter_list) {
+		struct dvb_adapter *adap;
+		adap = list_entry(entry, struct dvb_adapter, list_head);
+		if (adap->num == num)
+			return 0;
+	}
+	return 1;
+}
+
+static int dvbdev_get_free_adapter_num (void)
+{
+	int num = 0;
+
+	while (num < DVB_MAX_ADAPTERS) {
+		if (dvbdev_check_free_adapter_num(num))
+			return num;
+		num++;
+	}
+
+	return -ENFILE;
+}
+
+
+int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
+			 struct module *module, struct device *device,
+			 short *adapter_nums)
+{
+	int i, num;
+
+	mutex_lock(&dvbdev_register_lock);
+
+	for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
+		num = adapter_nums[i];
+		if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
+		/* use the one the driver asked for */
+			if (dvbdev_check_free_adapter_num(num))
+				break;
+		} else {
+			num = dvbdev_get_free_adapter_num();
+			break;
+		}
+		num = -1;
+	}
+
+	if (num < 0) {
+		mutex_unlock(&dvbdev_register_lock);
+		return -ENFILE;
+	}
+
+	memset (adap, 0, sizeof(struct dvb_adapter));
+	INIT_LIST_HEAD (&adap->device_list);
+
+	pr_info("DVB: registering new adapter (%s)\n", name);
+
+	adap->num = num;
+	adap->name = name;
+	adap->module = module;
+	adap->device = device;
+	adap->mfe_shared = 0;
+	adap->mfe_dvbdev = NULL;
+	mutex_init (&adap->mfe_lock);
+
+#ifdef CONFIG_MEDIA_CONTROLLER_DVB
+	mutex_init(&adap->mdev_lock);
+#endif
+
+	list_add_tail (&adap->list_head, &dvb_adapter_list);
+
+	mutex_unlock(&dvbdev_register_lock);
+
+	return num;
+}
+EXPORT_SYMBOL(dvb_register_adapter);
+
+
+int dvb_unregister_adapter(struct dvb_adapter *adap)
+{
+	mutex_lock(&dvbdev_register_lock);
+	list_del (&adap->list_head);
+	mutex_unlock(&dvbdev_register_lock);
+	return 0;
+}
+EXPORT_SYMBOL(dvb_unregister_adapter);
+
+/* if the miracle happens and "generic_usercopy()" is included into
+   the kernel, then this can vanish. please don't make the mistake and
+   define this as video_usercopy(). this will introduce a dependecy
+   to the v4l "videodev.o" module, which is unnecessary for some
+   cards (ie. the budget dvb-cards don't need the v4l module...) */
+int dvb_usercopy(struct file *file,
+		     unsigned int cmd, unsigned long arg,
+		     int (*func)(struct file *file,
+		     unsigned int cmd, void *arg))
+{
+	char    sbuf[128];
+	void    *mbuf = NULL;
+	void    *parg = NULL;
+	int     err  = -EINVAL;
+
+	/*  Copy arguments into temp kernel buffer  */
+	switch (_IOC_DIR(cmd)) {
+	case _IOC_NONE:
+		/*
+		 * For this command, the pointer is actually an integer
+		 * argument.
+		 */
+		parg = (void *) arg;
+		break;
+	case _IOC_READ: /* some v4l ioctls are marked wrong ... */
+	case _IOC_WRITE:
+	case (_IOC_WRITE | _IOC_READ):
+		if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
+			parg = sbuf;
+		} else {
+			/* too big to allocate from stack */
+			mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
+			if (NULL == mbuf)
+				return -ENOMEM;
+			parg = mbuf;
+		}
+
+		err = -EFAULT;
+		if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
+			goto out;
+		break;
+	}
+
+	/* call driver */
+	if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
+		err = -ENOTTY;
+
+	if (err < 0)
+		goto out;
+
+	/*  Copy results into user buffer  */
+	switch (_IOC_DIR(cmd))
+	{
+	case _IOC_READ:
+	case (_IOC_WRITE | _IOC_READ):
+		if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
+			err = -EFAULT;
+		break;
+	}
+
+out:
+	kfree(mbuf);
+	return err;
+}
+
+#if IS_ENABLED(CONFIG_I2C)
+struct i2c_client *dvb_module_probe(const char *module_name,
+				    const char *name,
+				    struct i2c_adapter *adap,
+				    unsigned char addr,
+				    void *platform_data)
+{
+	struct i2c_client *client;
+	struct i2c_board_info *board_info;
+
+	board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
+	if (!board_info)
+		return NULL;
+
+	if (name)
+		strlcpy(board_info->type, name, I2C_NAME_SIZE);
+	else
+		strlcpy(board_info->type, module_name, I2C_NAME_SIZE);
+
+	board_info->addr = addr;
+	board_info->platform_data = platform_data;
+	request_module(module_name);
+	client = i2c_new_device(adap, board_info);
+	if (client == NULL || client->dev.driver == NULL) {
+		kfree(board_info);
+		return NULL;
+	}
+
+	if (!try_module_get(client->dev.driver->owner)) {
+		i2c_unregister_device(client);
+		client = NULL;
+	}
+
+	kfree(board_info);
+	return client;
+}
+EXPORT_SYMBOL_GPL(dvb_module_probe);
+
+void dvb_module_release(struct i2c_client *client)
+{
+	if (!client)
+		return;
+
+	module_put(client->dev.driver->owner);
+	i2c_unregister_device(client);
+}
+EXPORT_SYMBOL_GPL(dvb_module_release);
+#endif
+
+static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	struct dvb_device *dvbdev = dev_get_drvdata(dev);
+
+	add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
+	add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
+	add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
+	return 0;
+}
+
+static char *dvb_devnode(struct device *dev, umode_t *mode)
+{
+	struct dvb_device *dvbdev = dev_get_drvdata(dev);
+
+	return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
+		dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
+}
+
+
+static int __init init_dvbdev(void)
+{
+	int retval;
+	dev_t dev = MKDEV(DVB_MAJOR, 0);
+
+	if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
+		pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
+		return retval;
+	}
+
+	cdev_init(&dvb_device_cdev, &dvb_device_fops);
+	if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
+		pr_err("dvb-core: unable register character device\n");
+		goto error;
+	}
+
+	dvb_class = class_create(THIS_MODULE, "dvb");
+	if (IS_ERR(dvb_class)) {
+		retval = PTR_ERR(dvb_class);
+		goto error;
+	}
+	dvb_class->dev_uevent = dvb_uevent;
+	dvb_class->devnode = dvb_devnode;
+	return 0;
+
+error:
+	cdev_del(&dvb_device_cdev);
+	unregister_chrdev_region(dev, MAX_DVB_MINORS);
+	return retval;
+}
+
+
+static void __exit exit_dvbdev(void)
+{
+	class_destroy(dvb_class);
+	cdev_del(&dvb_device_cdev);
+	unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
+}
+
+subsys_initcall(init_dvbdev);
+module_exit(exit_dvbdev);
+
+MODULE_DESCRIPTION("DVB Core Driver");
+MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
+MODULE_LICENSE("GPL");