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path: root/drivers/media/pci/ngene/ngene-dvb.c
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Diffstat (limited to 'drivers/media/pci/ngene/ngene-dvb.c')
-rw-r--r--drivers/media/pci/ngene/ngene-dvb.c340
1 files changed, 340 insertions, 0 deletions
diff --git a/drivers/media/pci/ngene/ngene-dvb.c b/drivers/media/pci/ngene/ngene-dvb.c
new file mode 100644
index 000000000..fda24ba3d
--- /dev/null
+++ b/drivers/media/pci/ngene/ngene-dvb.c
@@ -0,0 +1,340 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ngene-dvb.c: nGene PCIe bridge driver - DVB functions
+ *
+ * Copyright (C) 2005-2007 Micronas
+ *
+ * Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de>
+ * Modifications for new nGene firmware,
+ * support for EEPROM-copying,
+ * support for new dual DVB-S2 card prototype
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/io.h>
+#include <asm/div64.h>
+#include <linux/pci.h>
+#include <linux/timer.h>
+#include <linux/byteorder/generic.h>
+#include <linux/firmware.h>
+#include <linux/vmalloc.h>
+
+#include "ngene.h"
+
+static int ci_tsfix = 1;
+module_param(ci_tsfix, int, 0444);
+MODULE_PARM_DESC(ci_tsfix, "Detect and fix TS buffer offset shifts in conjunction with CI expansions (default: 1/enabled)");
+
+/****************************************************************************/
+/* COMMAND API interface ****************************************************/
+/****************************************************************************/
+
+static ssize_t ts_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct dvb_device *dvbdev = file->private_data;
+ struct ngene_channel *chan = dvbdev->priv;
+ struct ngene *dev = chan->dev;
+
+ if (wait_event_interruptible(dev->tsout_rbuf.queue,
+ dvb_ringbuffer_free
+ (&dev->tsout_rbuf) >= count) < 0)
+ return 0;
+
+ dvb_ringbuffer_write_user(&dev->tsout_rbuf, buf, count);
+
+ return count;
+}
+
+static ssize_t ts_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct dvb_device *dvbdev = file->private_data;
+ struct ngene_channel *chan = dvbdev->priv;
+ struct ngene *dev = chan->dev;
+ int left, avail;
+
+ left = count;
+ while (left) {
+ if (wait_event_interruptible(
+ dev->tsin_rbuf.queue,
+ dvb_ringbuffer_avail(&dev->tsin_rbuf) > 0) < 0)
+ return -EAGAIN;
+ avail = dvb_ringbuffer_avail(&dev->tsin_rbuf);
+ if (avail > left)
+ avail = left;
+ dvb_ringbuffer_read_user(&dev->tsin_rbuf, buf, avail);
+ left -= avail;
+ buf += avail;
+ }
+ return count;
+}
+
+static __poll_t ts_poll(struct file *file, poll_table *wait)
+{
+ struct dvb_device *dvbdev = file->private_data;
+ struct ngene_channel *chan = dvbdev->priv;
+ struct ngene *dev = chan->dev;
+ struct dvb_ringbuffer *rbuf = &dev->tsin_rbuf;
+ struct dvb_ringbuffer *wbuf = &dev->tsout_rbuf;
+ __poll_t mask = 0;
+
+ poll_wait(file, &rbuf->queue, wait);
+ poll_wait(file, &wbuf->queue, wait);
+
+ if (!dvb_ringbuffer_empty(rbuf))
+ mask |= EPOLLIN | EPOLLRDNORM;
+ if (dvb_ringbuffer_free(wbuf) >= 188)
+ mask |= EPOLLOUT | EPOLLWRNORM;
+
+ return mask;
+}
+
+static const struct file_operations ci_fops = {
+ .owner = THIS_MODULE,
+ .read = ts_read,
+ .write = ts_write,
+ .open = dvb_generic_open,
+ .release = dvb_generic_release,
+ .poll = ts_poll,
+ .mmap = NULL,
+};
+
+struct dvb_device ngene_dvbdev_ci = {
+ .priv = NULL,
+ .readers = 1,
+ .writers = 1,
+ .users = 2,
+ .fops = &ci_fops,
+};
+
+
+/****************************************************************************/
+/* DVB functions and API interface ******************************************/
+/****************************************************************************/
+
+static void swap_buffer(u32 *p, u32 len)
+{
+ while (len) {
+ *p = swab32(*p);
+ p++;
+ len -= 4;
+ }
+}
+
+/* start of filler packet */
+static u8 fill_ts[] = { 0x47, 0x1f, 0xff, 0x10, TS_FILLER };
+
+static int tsin_find_offset(void *buf, u32 len)
+{
+ int i, l;
+
+ l = len - sizeof(fill_ts);
+ if (l <= 0)
+ return -1;
+
+ for (i = 0; i < l; i++) {
+ if (((char *)buf)[i] == 0x47) {
+ if (!memcmp(buf + i, fill_ts, sizeof(fill_ts)))
+ return i % 188;
+ }
+ }
+
+ return -1;
+}
+
+static inline void tsin_copy_stripped(struct ngene *dev, void *buf)
+{
+ if (memcmp(buf, fill_ts, sizeof(fill_ts)) != 0) {
+ if (dvb_ringbuffer_free(&dev->tsin_rbuf) >= 188) {
+ dvb_ringbuffer_write(&dev->tsin_rbuf, buf, 188);
+ wake_up(&dev->tsin_rbuf.queue);
+ }
+ }
+}
+
+void *tsin_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
+{
+ struct ngene_channel *chan = priv;
+ struct ngene *dev = chan->dev;
+ int tsoff;
+
+ if (flags & DF_SWAP32)
+ swap_buffer(buf, len);
+
+ if (dev->ci.en && chan->number == 2) {
+ /* blindly copy buffers if ci_tsfix is disabled */
+ if (!ci_tsfix) {
+ while (len >= 188) {
+ tsin_copy_stripped(dev, buf);
+
+ buf += 188;
+ len -= 188;
+ }
+ return NULL;
+ }
+
+ /* ci_tsfix = 1 */
+
+ /*
+ * since the remainder of the TS packet which got cut off
+ * in the previous tsin_exchange() run is at the beginning
+ * of the new TS buffer, append this to the temp buffer and
+ * send it to the DVB ringbuffer afterwards.
+ */
+ if (chan->tsin_offset) {
+ memcpy(&chan->tsin_buffer[(188 - chan->tsin_offset)],
+ buf, chan->tsin_offset);
+ tsin_copy_stripped(dev, &chan->tsin_buffer);
+
+ buf += chan->tsin_offset;
+ len -= chan->tsin_offset;
+ }
+
+ /*
+ * copy TS packets to the DVB ringbuffer and detect new offset
+ * shifts by checking for a valid TS SYNC byte
+ */
+ while (len >= 188) {
+ if (*((char *)buf) != 0x47) {
+ /*
+ * no SYNC header, find new offset shift
+ * (max. 188 bytes, tsoff will be mod 188)
+ */
+ tsoff = tsin_find_offset(buf, len);
+ if (tsoff > 0) {
+ chan->tsin_offset += tsoff;
+ chan->tsin_offset %= 188;
+
+ buf += tsoff;
+ len -= tsoff;
+
+ dev_info(&dev->pci_dev->dev,
+ "%s(): tsin_offset shift by %d on channel %d\n",
+ __func__, tsoff,
+ chan->number);
+
+ /*
+ * offset corrected. re-check remaining
+ * len for a full TS frame, break and
+ * skip to fragment handling if < 188.
+ */
+ if (len < 188)
+ break;
+ }
+ }
+
+ tsin_copy_stripped(dev, buf);
+
+ buf += 188;
+ len -= 188;
+ }
+
+ /*
+ * if a fragment is left, copy to temp buffer. The remainder
+ * will be appended in the next tsin_exchange() iteration.
+ */
+ if (len > 0 && len < 188)
+ memcpy(&chan->tsin_buffer, buf, len);
+
+ return NULL;
+ }
+
+ if (chan->users > 0)
+ dvb_dmx_swfilter(&chan->demux, buf, len);
+
+ return NULL;
+}
+
+void *tsout_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
+{
+ struct ngene_channel *chan = priv;
+ struct ngene *dev = chan->dev;
+ u32 alen;
+
+ alen = dvb_ringbuffer_avail(&dev->tsout_rbuf);
+ alen -= alen % 188;
+
+ if (alen < len)
+ FillTSBuffer(buf + alen, len - alen, flags);
+ else
+ alen = len;
+ dvb_ringbuffer_read(&dev->tsout_rbuf, buf, alen);
+ if (flags & DF_SWAP32)
+ swap_buffer((u32 *)buf, alen);
+ wake_up_interruptible(&dev->tsout_rbuf.queue);
+ return buf;
+}
+
+
+
+int ngene_start_feed(struct dvb_demux_feed *dvbdmxfeed)
+{
+ struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
+ struct ngene_channel *chan = dvbdmx->priv;
+
+ if (chan->users == 0) {
+ if (!chan->dev->cmd_timeout_workaround || !chan->running)
+ set_transfer(chan, 1);
+ }
+
+ return ++chan->users;
+}
+
+int ngene_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
+{
+ struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
+ struct ngene_channel *chan = dvbdmx->priv;
+
+ if (--chan->users)
+ return chan->users;
+
+ if (!chan->dev->cmd_timeout_workaround)
+ set_transfer(chan, 0);
+
+ return 0;
+}
+
+int my_dvb_dmx_ts_card_init(struct dvb_demux *dvbdemux, char *id,
+ int (*start_feed)(struct dvb_demux_feed *),
+ int (*stop_feed)(struct dvb_demux_feed *),
+ void *priv)
+{
+ dvbdemux->priv = priv;
+
+ dvbdemux->filternum = 256;
+ dvbdemux->feednum = 256;
+ dvbdemux->start_feed = start_feed;
+ dvbdemux->stop_feed = stop_feed;
+ dvbdemux->write_to_decoder = NULL;
+ dvbdemux->dmx.capabilities = (DMX_TS_FILTERING |
+ DMX_SECTION_FILTERING |
+ DMX_MEMORY_BASED_FILTERING);
+ return dvb_dmx_init(dvbdemux);
+}
+
+int my_dvb_dmxdev_ts_card_init(struct dmxdev *dmxdev,
+ struct dvb_demux *dvbdemux,
+ struct dmx_frontend *hw_frontend,
+ struct dmx_frontend *mem_frontend,
+ struct dvb_adapter *dvb_adapter)
+{
+ int ret;
+
+ dmxdev->filternum = 256;
+ dmxdev->demux = &dvbdemux->dmx;
+ dmxdev->capabilities = 0;
+ ret = dvb_dmxdev_init(dmxdev, dvb_adapter);
+ if (ret < 0)
+ return ret;
+
+ hw_frontend->source = DMX_FRONTEND_0;
+ dvbdemux->dmx.add_frontend(&dvbdemux->dmx, hw_frontend);
+ mem_frontend->source = DMX_MEMORY_FE;
+ dvbdemux->dmx.add_frontend(&dvbdemux->dmx, mem_frontend);
+ return dvbdemux->dmx.connect_frontend(&dvbdemux->dmx, hw_frontend);
+}
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