Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 1202 insertions, 0 deletions

diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
new file mode 100644
index 000000000..243acad89
--- /dev/null
+++ b/sound/core/compress_offload.c
@@ -0,0 +1,1202 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  compress_core.c - compress offload core
+ *
+ *  Copyright (C) 2011 Intel Corporation
+ *  Authors:	Vinod Koul <vinod.koul@linux.intel.com>
+ *		Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+#define FORMAT(fmt) "%s: %d: " fmt, __func__, __LINE__
+#define pr_fmt(fmt) KBUILD_MODNAME ": " FORMAT(fmt)
+
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/list.h>
+#include <linux/math64.h>
+#include <linux/mm.h>
+#include <linux/mutex.h>
+#include <linux/poll.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/uio.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/compat.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/info.h>
+#include <sound/compress_params.h>
+#include <sound/compress_offload.h>
+#include <sound/compress_driver.h>
+
+/* struct snd_compr_codec_caps overflows the ioctl bit size for some
+ * architectures, so we need to disable the relevant ioctls.
+ */
+#if _IOC_SIZEBITS < 14
+#define COMPR_CODEC_CAPS_OVERFLOW
+#endif
+
+/* TODO:
+ * - add substream support for multiple devices in case of
+ *	SND_DYNAMIC_MINORS is not used
+ * - Multiple node representation
+ *	driver should be able to register multiple nodes
+ */
+
+struct snd_compr_file {
+	unsigned long caps;
+	struct snd_compr_stream stream;
+};
+
+static void error_delayed_work(struct work_struct *work);
+
+/*
+ * a note on stream states used:
+ * we use following states in the compressed core
+ * SNDRV_PCM_STATE_OPEN: When stream has been opened.
+ * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
+ *	calling SNDRV_COMPRESS_SET_PARAMS. Running streams will come to this
+ *	state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
+ * SNDRV_PCM_STATE_PREPARED: When a stream has been written to (for
+ *	playback only). User after setting up stream writes the data buffer
+ *	before starting the stream.
+ * SNDRV_PCM_STATE_RUNNING: When stream has been started and is
+ *	decoding/encoding and rendering/capturing data.
+ * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
+ *	by calling SNDRV_COMPRESS_DRAIN.
+ * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
+ *	SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
+ *	SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
+ */
+static int snd_compr_open(struct inode *inode, struct file *f)
+{
+	struct snd_compr *compr;
+	struct snd_compr_file *data;
+	struct snd_compr_runtime *runtime;
+	enum snd_compr_direction dirn;
+	int maj = imajor(inode);
+	int ret;
+
+	if ((f->f_flags & O_ACCMODE) == O_WRONLY)
+		dirn = SND_COMPRESS_PLAYBACK;
+	else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
+		dirn = SND_COMPRESS_CAPTURE;
+	else
+		return -EINVAL;
+
+	if (maj == snd_major)
+		compr = snd_lookup_minor_data(iminor(inode),
+					SNDRV_DEVICE_TYPE_COMPRESS);
+	else
+		return -EBADFD;
+
+	if (compr == NULL) {
+		pr_err("no device data!!!\n");
+		return -ENODEV;
+	}
+
+	if (dirn != compr->direction) {
+		pr_err("this device doesn't support this direction\n");
+		snd_card_unref(compr->card);
+		return -EINVAL;
+	}
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data) {
+		snd_card_unref(compr->card);
+		return -ENOMEM;
+	}
+
+	INIT_DELAYED_WORK(&data->stream.error_work, error_delayed_work);
+
+	data->stream.ops = compr->ops;
+	data->stream.direction = dirn;
+	data->stream.private_data = compr->private_data;
+	data->stream.device = compr;
+	runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
+	if (!runtime) {
+		kfree(data);
+		snd_card_unref(compr->card);
+		return -ENOMEM;
+	}
+	runtime->state = SNDRV_PCM_STATE_OPEN;
+	init_waitqueue_head(&runtime->sleep);
+	data->stream.runtime = runtime;
+	f->private_data = (void *)data;
+	mutex_lock(&compr->lock);
+	ret = compr->ops->open(&data->stream);
+	mutex_unlock(&compr->lock);
+	if (ret) {
+		kfree(runtime);
+		kfree(data);
+	}
+	snd_card_unref(compr->card);
+	return ret;
+}
+
+static int snd_compr_free(struct inode *inode, struct file *f)
+{
+	struct snd_compr_file *data = f->private_data;
+	struct snd_compr_runtime *runtime = data->stream.runtime;
+
+	cancel_delayed_work_sync(&data->stream.error_work);
+
+	switch (runtime->state) {
+	case SNDRV_PCM_STATE_RUNNING:
+	case SNDRV_PCM_STATE_DRAINING:
+	case SNDRV_PCM_STATE_PAUSED:
+		data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP);
+		break;
+	default:
+		break;
+	}
+
+	data->stream.ops->free(&data->stream);
+	if (!data->stream.runtime->dma_buffer_p)
+		kfree(data->stream.runtime->buffer);
+	kfree(data->stream.runtime);
+	kfree(data);
+	return 0;
+}
+
+static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
+		struct snd_compr_tstamp *tstamp)
+{
+	if (!stream->ops->pointer)
+		return -ENOTSUPP;
+	stream->ops->pointer(stream, tstamp);
+	pr_debug("dsp consumed till %d total %d bytes\n",
+		tstamp->byte_offset, tstamp->copied_total);
+	if (stream->direction == SND_COMPRESS_PLAYBACK)
+		stream->runtime->total_bytes_transferred = tstamp->copied_total;
+	else
+		stream->runtime->total_bytes_available = tstamp->copied_total;
+	return 0;
+}
+
+static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
+		struct snd_compr_avail *avail)
+{
+	memset(avail, 0, sizeof(*avail));
+	snd_compr_update_tstamp(stream, &avail->tstamp);
+	/* Still need to return avail even if tstamp can't be filled in */
+
+	if (stream->runtime->total_bytes_available == 0 &&
+			stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
+			stream->direction == SND_COMPRESS_PLAYBACK) {
+		pr_debug("detected init and someone forgot to do a write\n");
+		return stream->runtime->buffer_size;
+	}
+	pr_debug("app wrote %lld, DSP consumed %lld\n",
+			stream->runtime->total_bytes_available,
+			stream->runtime->total_bytes_transferred);
+	if (stream->runtime->total_bytes_available ==
+				stream->runtime->total_bytes_transferred) {
+		if (stream->direction == SND_COMPRESS_PLAYBACK) {
+			pr_debug("both pointers are same, returning full avail\n");
+			return stream->runtime->buffer_size;
+		} else {
+			pr_debug("both pointers are same, returning no avail\n");
+			return 0;
+		}
+	}
+
+	avail->avail = stream->runtime->total_bytes_available -
+			stream->runtime->total_bytes_transferred;
+	if (stream->direction == SND_COMPRESS_PLAYBACK)
+		avail->avail = stream->runtime->buffer_size - avail->avail;
+
+	pr_debug("ret avail as %lld\n", avail->avail);
+	return avail->avail;
+}
+
+static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
+{
+	struct snd_compr_avail avail;
+
+	return snd_compr_calc_avail(stream, &avail);
+}
+
+static int
+snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
+{
+	struct snd_compr_avail ioctl_avail;
+	size_t avail;
+
+	avail = snd_compr_calc_avail(stream, &ioctl_avail);
+	ioctl_avail.avail = avail;
+
+	switch (stream->runtime->state) {
+	case SNDRV_PCM_STATE_OPEN:
+		return -EBADFD;
+	case SNDRV_PCM_STATE_XRUN:
+		return -EPIPE;
+	default:
+		break;
+	}
+
+	if (copy_to_user((__u64 __user *)arg,
+				&ioctl_avail, sizeof(ioctl_avail)))
+		return -EFAULT;
+	return 0;
+}
+
+static int snd_compr_write_data(struct snd_compr_stream *stream,
+	       const char __user *buf, size_t count)
+{
+	void *dstn;
+	size_t copy;
+	struct snd_compr_runtime *runtime = stream->runtime;
+	/* 64-bit Modulus */
+	u64 app_pointer = div64_u64(runtime->total_bytes_available,
+				    runtime->buffer_size);
+	app_pointer = runtime->total_bytes_available -
+		      (app_pointer * runtime->buffer_size);
+
+	dstn = runtime->buffer + app_pointer;
+	pr_debug("copying %ld at %lld\n",
+			(unsigned long)count, app_pointer);
+	if (count < runtime->buffer_size - app_pointer) {
+		if (copy_from_user(dstn, buf, count))
+			return -EFAULT;
+	} else {
+		copy = runtime->buffer_size - app_pointer;
+		if (copy_from_user(dstn, buf, copy))
+			return -EFAULT;
+		if (copy_from_user(runtime->buffer, buf + copy, count - copy))
+			return -EFAULT;
+	}
+	/* if DSP cares, let it know data has been written */
+	if (stream->ops->ack)
+		stream->ops->ack(stream, count);
+	return count;
+}
+
+static ssize_t snd_compr_write(struct file *f, const char __user *buf,
+		size_t count, loff_t *offset)
+{
+	struct snd_compr_file *data = f->private_data;
+	struct snd_compr_stream *stream;
+	size_t avail;
+	int retval;
+
+	if (snd_BUG_ON(!data))
+		return -EFAULT;
+
+	stream = &data->stream;
+	mutex_lock(&stream->device->lock);
+	/* write is allowed when stream is running or has been steup */
+	switch (stream->runtime->state) {
+	case SNDRV_PCM_STATE_SETUP:
+	case SNDRV_PCM_STATE_PREPARED:
+	case SNDRV_PCM_STATE_RUNNING:
+		break;
+	default:
+		mutex_unlock(&stream->device->lock);
+		return -EBADFD;
+	}
+
+	avail = snd_compr_get_avail(stream);
+	pr_debug("avail returned %ld\n", (unsigned long)avail);
+	/* calculate how much we can write to buffer */
+	if (avail > count)
+		avail = count;
+
+	if (stream->ops->copy) {
+		char __user* cbuf = (char __user*)buf;
+		retval = stream->ops->copy(stream, cbuf, avail);
+	} else {
+		retval = snd_compr_write_data(stream, buf, avail);
+	}
+	if (retval > 0)
+		stream->runtime->total_bytes_available += retval;
+
+	/* while initiating the stream, write should be called before START
+	 * call, so in setup move state */
+	if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
+		stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
+		pr_debug("stream prepared, Houston we are good to go\n");
+	}
+
+	mutex_unlock(&stream->device->lock);
+	return retval;
+}
+
+
+static ssize_t snd_compr_read(struct file *f, char __user *buf,
+		size_t count, loff_t *offset)
+{
+	struct snd_compr_file *data = f->private_data;
+	struct snd_compr_stream *stream;
+	size_t avail;
+	int retval;
+
+	if (snd_BUG_ON(!data))
+		return -EFAULT;
+
+	stream = &data->stream;
+	mutex_lock(&stream->device->lock);
+
+	/* read is allowed when stream is running, paused, draining and setup
+	 * (yes setup is state which we transition to after stop, so if user
+	 * wants to read data after stop we allow that)
+	 */
+	switch (stream->runtime->state) {
+	case SNDRV_PCM_STATE_OPEN:
+	case SNDRV_PCM_STATE_PREPARED:
+	case SNDRV_PCM_STATE_SUSPENDED:
+	case SNDRV_PCM_STATE_DISCONNECTED:
+		retval = -EBADFD;
+		goto out;
+	case SNDRV_PCM_STATE_XRUN:
+		retval = -EPIPE;
+		goto out;
+	}
+
+	avail = snd_compr_get_avail(stream);
+	pr_debug("avail returned %ld\n", (unsigned long)avail);
+	/* calculate how much we can read from buffer */
+	if (avail > count)
+		avail = count;
+
+	if (stream->ops->copy) {
+		retval = stream->ops->copy(stream, buf, avail);
+	} else {
+		retval = -ENXIO;
+		goto out;
+	}
+	if (retval > 0)
+		stream->runtime->total_bytes_transferred += retval;
+
+out:
+	mutex_unlock(&stream->device->lock);
+	return retval;
+}
+
+static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
+{
+	return -ENXIO;
+}
+
+static __poll_t snd_compr_get_poll(struct snd_compr_stream *stream)
+{
+	if (stream->direction == SND_COMPRESS_PLAYBACK)
+		return EPOLLOUT | EPOLLWRNORM;
+	else
+		return EPOLLIN | EPOLLRDNORM;
+}
+
+static __poll_t snd_compr_poll(struct file *f, poll_table *wait)
+{
+	struct snd_compr_file *data = f->private_data;
+	struct snd_compr_stream *stream;
+	size_t avail;
+	__poll_t retval = 0;
+
+	if (snd_BUG_ON(!data))
+		return EPOLLERR;
+
+	stream = &data->stream;
+
+	mutex_lock(&stream->device->lock);
+
+	switch (stream->runtime->state) {
+	case SNDRV_PCM_STATE_OPEN:
+	case SNDRV_PCM_STATE_XRUN:
+		retval = snd_compr_get_poll(stream) | EPOLLERR;
+		goto out;
+	default:
+		break;
+	}
+
+	poll_wait(f, &stream->runtime->sleep, wait);
+
+	avail = snd_compr_get_avail(stream);
+	pr_debug("avail is %ld\n", (unsigned long)avail);
+	/* check if we have at least one fragment to fill */
+	switch (stream->runtime->state) {
+	case SNDRV_PCM_STATE_DRAINING:
+		/* stream has been woken up after drain is complete
+		 * draining done so set stream state to stopped
+		 */
+		retval = snd_compr_get_poll(stream);
+		stream->runtime->state = SNDRV_PCM_STATE_SETUP;
+		break;
+	case SNDRV_PCM_STATE_RUNNING:
+	case SNDRV_PCM_STATE_PREPARED:
+	case SNDRV_PCM_STATE_PAUSED:
+		if (avail >= stream->runtime->fragment_size)
+			retval = snd_compr_get_poll(stream);
+		break;
+	default:
+		retval = snd_compr_get_poll(stream) | EPOLLERR;
+		break;
+	}
+out:
+	mutex_unlock(&stream->device->lock);
+	return retval;
+}
+
+static int
+snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
+{
+	int retval;
+	struct snd_compr_caps caps;
+
+	if (!stream->ops->get_caps)
+		return -ENXIO;
+
+	memset(&caps, 0, sizeof(caps));
+	retval = stream->ops->get_caps(stream, &caps);
+	if (retval)
+		goto out;
+	if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
+		retval = -EFAULT;
+out:
+	return retval;
+}
+
+#ifndef COMPR_CODEC_CAPS_OVERFLOW
+static int
+snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
+{
+	int retval;
+	struct snd_compr_codec_caps *caps;
+
+	if (!stream->ops->get_codec_caps)
+		return -ENXIO;
+
+	caps = kzalloc(sizeof(*caps), GFP_KERNEL);
+	if (!caps)
+		return -ENOMEM;
+
+	retval = stream->ops->get_codec_caps(stream, caps);
+	if (retval)
+		goto out;
+	if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
+		retval = -EFAULT;
+
+out:
+	kfree(caps);
+	return retval;
+}
+#endif /* !COMPR_CODEC_CAPS_OVERFLOW */
+
+int snd_compr_malloc_pages(struct snd_compr_stream *stream, size_t size)
+{
+	struct snd_dma_buffer *dmab;
+	int ret;
+
+	if (snd_BUG_ON(!(stream) || !(stream)->runtime))
+		return -EINVAL;
+	dmab = kzalloc(sizeof(*dmab), GFP_KERNEL);
+	if (!dmab)
+		return -ENOMEM;
+	dmab->dev = stream->dma_buffer.dev;
+	ret = snd_dma_alloc_pages(dmab->dev.type, dmab->dev.dev, size, dmab);
+	if (ret < 0) {
+		kfree(dmab);
+		return ret;
+	}
+
+	snd_compr_set_runtime_buffer(stream, dmab);
+	stream->runtime->dma_bytes = size;
+	return 1;
+}
+EXPORT_SYMBOL(snd_compr_malloc_pages);
+
+int snd_compr_free_pages(struct snd_compr_stream *stream)
+{
+	struct snd_compr_runtime *runtime;
+
+	if (snd_BUG_ON(!(stream) || !(stream)->runtime))
+		return -EINVAL;
+	runtime = stream->runtime;
+	if (runtime->dma_area == NULL)
+		return 0;
+	if (runtime->dma_buffer_p != &stream->dma_buffer) {
+		/* It's a newly allocated buffer. Release it now. */
+		snd_dma_free_pages(runtime->dma_buffer_p);
+		kfree(runtime->dma_buffer_p);
+	}
+
+	snd_compr_set_runtime_buffer(stream, NULL);
+	return 0;
+}
+EXPORT_SYMBOL(snd_compr_free_pages);
+
+/* revisit this with snd_pcm_preallocate_xxx */
+static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
+		struct snd_compr_params *params)
+{
+	unsigned int buffer_size;
+	void *buffer = NULL;
+
+	buffer_size = params->buffer.fragment_size * params->buffer.fragments;
+	if (stream->ops->copy) {
+		buffer = NULL;
+		/* if copy is defined the driver will be required to copy
+		 * the data from core
+		 */
+	} else {
+		if (stream->runtime->dma_buffer_p) {
+
+			if (buffer_size > stream->runtime->dma_buffer_p->bytes)
+				dev_err(&stream->device->dev,
+						"Not enough DMA buffer");
+			else
+				buffer = stream->runtime->dma_buffer_p->area;
+
+		} else {
+			buffer = kmalloc(buffer_size, GFP_KERNEL);
+		}
+
+		if (!buffer)
+			return -ENOMEM;
+	}
+	stream->runtime->fragment_size = params->buffer.fragment_size;
+	stream->runtime->fragments = params->buffer.fragments;
+	stream->runtime->buffer = buffer;
+	stream->runtime->buffer_size = buffer_size;
+	return 0;
+}
+
+static int snd_compress_check_input(struct snd_compr_params *params)
+{
+	/* first let's check the buffer parameter's */
+	if (params->buffer.fragment_size == 0 ||
+	    params->buffer.fragments > U32_MAX / params->buffer.fragment_size ||
+	    params->buffer.fragments == 0)
+		return -EINVAL;
+
+	/* now codec parameters */
+	if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
+		return -EINVAL;
+
+	if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int
+snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
+{
+	struct snd_compr_params *params;
+	int retval;
+
+	if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
+		/*
+		 * we should allow parameter change only when stream has been
+		 * opened not in other cases
+		 */
+		params = memdup_user((void __user *)arg, sizeof(*params));
+		if (IS_ERR(params))
+			return PTR_ERR(params);
+
+		retval = snd_compress_check_input(params);
+		if (retval)
+			goto out;
+
+		retval = snd_compr_allocate_buffer(stream, params);
+		if (retval) {
+			retval = -ENOMEM;
+			goto out;
+		}
+
+		retval = stream->ops->set_params(stream, params);
+		if (retval)
+			goto out;
+
+		stream->metadata_set = false;
+		stream->next_track = false;
+
+		stream->runtime->state = SNDRV_PCM_STATE_SETUP;
+	} else {
+		return -EPERM;
+	}
+out:
+	kfree(params);
+	return retval;
+}
+
+static int
+snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
+{
+	struct snd_codec *params;
+	int retval;
+
+	if (!stream->ops->get_params)
+		return -EBADFD;
+
+	params = kzalloc(sizeof(*params), GFP_KERNEL);
+	if (!params)
+		return -ENOMEM;
+	retval = stream->ops->get_params(stream, params);
+	if (retval)
+		goto out;
+	if (copy_to_user((char __user *)arg, params, sizeof(*params)))
+		retval = -EFAULT;
+
+out:
+	kfree(params);
+	return retval;
+}
+
+static int
+snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
+{
+	struct snd_compr_metadata metadata;
+	int retval;
+
+	if (!stream->ops->get_metadata)
+		return -ENXIO;
+
+	if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
+		return -EFAULT;
+
+	retval = stream->ops->get_metadata(stream, &metadata);
+	if (retval != 0)
+		return retval;
+
+	if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int
+snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
+{
+	struct snd_compr_metadata metadata;
+	int retval;
+
+	if (!stream->ops->set_metadata)
+		return -ENXIO;
+	/*
+	* we should allow parameter change only when stream has been
+	* opened not in other cases
+	*/
+	if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
+		return -EFAULT;
+
+	retval = stream->ops->set_metadata(stream, &metadata);
+	stream->metadata_set = true;
+
+	return retval;
+}
+
+static inline int
+snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
+{
+	struct snd_compr_tstamp tstamp = {0};
+	int ret;
+
+	ret = snd_compr_update_tstamp(stream, &tstamp);
+	if (ret == 0)
+		ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
+			&tstamp, sizeof(tstamp)) ? -EFAULT : 0;
+	return ret;
+}
+
+static int snd_compr_pause(struct snd_compr_stream *stream)
+{
+	int retval;
+
+	switch (stream->runtime->state) {
+	case SNDRV_PCM_STATE_RUNNING:
+		retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
+		if (!retval)
+			stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
+		break;
+	case SNDRV_PCM_STATE_DRAINING:
+		if (!stream->device->use_pause_in_draining)
+			return -EPERM;
+		retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
+		if (!retval)
+			stream->pause_in_draining = true;
+		break;
+	default:
+		return -EPERM;
+	}
+	return retval;
+}
+
+static int snd_compr_resume(struct snd_compr_stream *stream)
+{
+	int retval;
+
+	switch (stream->runtime->state) {
+	case SNDRV_PCM_STATE_PAUSED:
+		retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
+		if (!retval)
+			stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
+		break;
+	case SNDRV_PCM_STATE_DRAINING:
+		if (!stream->pause_in_draining)
+			return -EPERM;
+		retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
+		if (!retval)
+			stream->pause_in_draining = false;
+		break;
+	default:
+		return -EPERM;
+	}
+	return retval;
+}
+
+static int snd_compr_start(struct snd_compr_stream *stream)
+{
+	int retval;
+
+	switch (stream->runtime->state) {
+	case SNDRV_PCM_STATE_SETUP:
+		if (stream->direction != SND_COMPRESS_CAPTURE)
+			return -EPERM;
+		break;
+	case SNDRV_PCM_STATE_PREPARED:
+		break;
+	default:
+		return -EPERM;
+	}
+
+	retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
+	if (!retval)
+		stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
+	return retval;
+}
+
+static int snd_compr_stop(struct snd_compr_stream *stream)
+{
+	int retval;
+
+	switch (stream->runtime->state) {
+	case SNDRV_PCM_STATE_OPEN:
+	case SNDRV_PCM_STATE_SETUP:
+	case SNDRV_PCM_STATE_PREPARED:
+		return -EPERM;
+	default:
+		break;
+	}
+
+	retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
+	if (!retval) {
+		/* clear flags and stop any drain wait */
+		stream->partial_drain = false;
+		stream->metadata_set = false;
+		stream->pause_in_draining = false;
+		snd_compr_drain_notify(stream);
+		stream->runtime->total_bytes_available = 0;
+		stream->runtime->total_bytes_transferred = 0;
+	}
+	return retval;
+}
+
+static void error_delayed_work(struct work_struct *work)
+{
+	struct snd_compr_stream *stream;
+
+	stream = container_of(work, struct snd_compr_stream, error_work.work);
+
+	mutex_lock(&stream->device->lock);
+
+	stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
+	wake_up(&stream->runtime->sleep);
+
+	mutex_unlock(&stream->device->lock);
+}
+
+/**
+ * snd_compr_stop_error: Report a fatal error on a stream
+ * @stream: pointer to stream
+ * @state: state to transition the stream to
+ *
+ * Stop the stream and set its state.
+ *
+ * Should be called with compressed device lock held.
+ *
+ * Return: zero if successful, or a negative error code
+ */
+int snd_compr_stop_error(struct snd_compr_stream *stream,
+			 snd_pcm_state_t state)
+{
+	if (stream->runtime->state == state)
+		return 0;
+
+	stream->runtime->state = state;
+
+	pr_debug("Changing state to: %d\n", state);
+
+	queue_delayed_work(system_power_efficient_wq, &stream->error_work, 0);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_compr_stop_error);
+
+static int snd_compress_wait_for_drain(struct snd_compr_stream *stream)
+{
+	int ret;
+
+	/*
+	 * We are called with lock held. So drop the lock while we wait for
+	 * drain complete notification from the driver
+	 *
+	 * It is expected that driver will notify the drain completion and then
+	 * stream will be moved to SETUP state, even if draining resulted in an
+	 * error. We can trigger next track after this.
+	 */
+	stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
+	mutex_unlock(&stream->device->lock);
+
+	/* we wait for drain to complete here, drain can return when
+	 * interruption occurred, wait returned error or success.
+	 * For the first two cases we don't do anything different here and
+	 * return after waking up
+	 */
+
+	ret = wait_event_interruptible(stream->runtime->sleep,
+			(stream->runtime->state != SNDRV_PCM_STATE_DRAINING));
+	if (ret == -ERESTARTSYS)
+		pr_debug("wait aborted by a signal\n");
+	else if (ret)
+		pr_debug("wait for drain failed with %d\n", ret);
+
+
+	wake_up(&stream->runtime->sleep);
+	mutex_lock(&stream->device->lock);
+
+	return ret;
+}
+
+static int snd_compr_drain(struct snd_compr_stream *stream)
+{
+	int retval;
+
+	switch (stream->runtime->state) {
+	case SNDRV_PCM_STATE_OPEN:
+	case SNDRV_PCM_STATE_SETUP:
+	case SNDRV_PCM_STATE_PREPARED:
+	case SNDRV_PCM_STATE_PAUSED:
+		return -EPERM;
+	case SNDRV_PCM_STATE_XRUN:
+		return -EPIPE;
+	default:
+		break;
+	}
+
+	retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
+	if (retval) {
+		pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval);
+		wake_up(&stream->runtime->sleep);
+		return retval;
+	}
+
+	return snd_compress_wait_for_drain(stream);
+}
+
+static int snd_compr_next_track(struct snd_compr_stream *stream)
+{
+	int retval;
+
+	/* only a running stream can transition to next track */
+	if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
+		return -EPERM;
+
+	/* next track doesn't have any meaning for capture streams */
+	if (stream->direction == SND_COMPRESS_CAPTURE)
+		return -EPERM;
+
+	/* you can signal next track if this is intended to be a gapless stream
+	 * and current track metadata is set
+	 */
+	if (stream->metadata_set == false)
+		return -EPERM;
+
+	retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
+	if (retval != 0)
+		return retval;
+	stream->metadata_set = false;
+	stream->next_track = true;
+	return 0;
+}
+
+static int snd_compr_partial_drain(struct snd_compr_stream *stream)
+{
+	int retval;
+
+	switch (stream->runtime->state) {
+	case SNDRV_PCM_STATE_OPEN:
+	case SNDRV_PCM_STATE_SETUP:
+	case SNDRV_PCM_STATE_PREPARED:
+	case SNDRV_PCM_STATE_PAUSED:
+		return -EPERM;
+	case SNDRV_PCM_STATE_XRUN:
+		return -EPIPE;
+	default:
+		break;
+	}
+
+	/* partial drain doesn't have any meaning for capture streams */
+	if (stream->direction == SND_COMPRESS_CAPTURE)
+		return -EPERM;
+
+	/* stream can be drained only when next track has been signalled */
+	if (stream->next_track == false)
+		return -EPERM;
+
+	stream->partial_drain = true;
+	retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
+	if (retval) {
+		pr_debug("Partial drain returned failure\n");
+		wake_up(&stream->runtime->sleep);
+		return retval;
+	}
+
+	stream->next_track = false;
+	return snd_compress_wait_for_drain(stream);
+}
+
+static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
+{
+	struct snd_compr_file *data = f->private_data;
+	struct snd_compr_stream *stream;
+	int retval = -ENOTTY;
+
+	if (snd_BUG_ON(!data))
+		return -EFAULT;
+
+	stream = &data->stream;
+
+	mutex_lock(&stream->device->lock);
+	switch (_IOC_NR(cmd)) {
+	case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
+		retval = put_user(SNDRV_COMPRESS_VERSION,
+				(int __user *)arg) ? -EFAULT : 0;
+		break;
+	case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
+		retval = snd_compr_get_caps(stream, arg);
+		break;
+#ifndef COMPR_CODEC_CAPS_OVERFLOW
+	case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
+		retval = snd_compr_get_codec_caps(stream, arg);
+		break;
+#endif
+	case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
+		retval = snd_compr_set_params(stream, arg);
+		break;
+	case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
+		retval = snd_compr_get_params(stream, arg);
+		break;
+	case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
+		retval = snd_compr_set_metadata(stream, arg);
+		break;
+	case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
+		retval = snd_compr_get_metadata(stream, arg);
+		break;
+	case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
+		retval = snd_compr_tstamp(stream, arg);
+		break;
+	case _IOC_NR(SNDRV_COMPRESS_AVAIL):
+		retval = snd_compr_ioctl_avail(stream, arg);
+		break;
+	case _IOC_NR(SNDRV_COMPRESS_PAUSE):
+		retval = snd_compr_pause(stream);
+		break;
+	case _IOC_NR(SNDRV_COMPRESS_RESUME):
+		retval = snd_compr_resume(stream);
+		break;
+	case _IOC_NR(SNDRV_COMPRESS_START):
+		retval = snd_compr_start(stream);
+		break;
+	case _IOC_NR(SNDRV_COMPRESS_STOP):
+		retval = snd_compr_stop(stream);
+		break;
+	case _IOC_NR(SNDRV_COMPRESS_DRAIN):
+		retval = snd_compr_drain(stream);
+		break;
+	case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
+		retval = snd_compr_partial_drain(stream);
+		break;
+	case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
+		retval = snd_compr_next_track(stream);
+		break;
+
+	}
+	mutex_unlock(&stream->device->lock);
+	return retval;
+}
+
+/* support of 32bit userspace on 64bit platforms */
+#ifdef CONFIG_COMPAT
+static long snd_compr_ioctl_compat(struct file *file, unsigned int cmd,
+						unsigned long arg)
+{
+	return snd_compr_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
+static const struct file_operations snd_compr_file_ops = {
+		.owner =	THIS_MODULE,
+		.open =		snd_compr_open,
+		.release =	snd_compr_free,
+		.write =	snd_compr_write,
+		.read =		snd_compr_read,
+		.unlocked_ioctl = snd_compr_ioctl,
+#ifdef CONFIG_COMPAT
+		.compat_ioctl = snd_compr_ioctl_compat,
+#endif
+		.mmap =		snd_compr_mmap,
+		.poll =		snd_compr_poll,
+};
+
+static int snd_compress_dev_register(struct snd_device *device)
+{
+	int ret;
+	struct snd_compr *compr;
+
+	if (snd_BUG_ON(!device || !device->device_data))
+		return -EBADFD;
+	compr = device->device_data;
+
+	pr_debug("reg device %s, direction %d\n", compr->name,
+			compr->direction);
+	/* register compressed device */
+	ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS,
+				  compr->card, compr->device,
+				  &snd_compr_file_ops, compr, &compr->dev);
+	if (ret < 0) {
+		pr_err("snd_register_device failed %d\n", ret);
+		return ret;
+	}
+	return ret;
+
+}
+
+static int snd_compress_dev_disconnect(struct snd_device *device)
+{
+	struct snd_compr *compr;
+
+	compr = device->device_data;
+	snd_unregister_device(&compr->dev);
+	return 0;
+}
+
+#ifdef CONFIG_SND_VERBOSE_PROCFS
+static void snd_compress_proc_info_read(struct snd_info_entry *entry,
+					struct snd_info_buffer *buffer)
+{
+	struct snd_compr *compr = (struct snd_compr *)entry->private_data;
+
+	snd_iprintf(buffer, "card: %d\n", compr->card->number);
+	snd_iprintf(buffer, "device: %d\n", compr->device);
+	snd_iprintf(buffer, "stream: %s\n",
+			compr->direction == SND_COMPRESS_PLAYBACK
+				? "PLAYBACK" : "CAPTURE");
+	snd_iprintf(buffer, "id: %s\n", compr->id);
+}
+
+static int snd_compress_proc_init(struct snd_compr *compr)
+{
+	struct snd_info_entry *entry;
+	char name[16];
+
+	sprintf(name, "compr%i", compr->device);
+	entry = snd_info_create_card_entry(compr->card, name,
+					   compr->card->proc_root);
+	if (!entry)
+		return -ENOMEM;
+	entry->mode = S_IFDIR | 0555;
+	compr->proc_root = entry;
+
+	entry = snd_info_create_card_entry(compr->card, "info",
+					   compr->proc_root);
+	if (entry)
+		snd_info_set_text_ops(entry, compr,
+				      snd_compress_proc_info_read);
+	compr->proc_info_entry = entry;
+
+	return 0;
+}
+
+static void snd_compress_proc_done(struct snd_compr *compr)
+{
+	snd_info_free_entry(compr->proc_info_entry);
+	compr->proc_info_entry = NULL;
+	snd_info_free_entry(compr->proc_root);
+	compr->proc_root = NULL;
+}
+
+static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
+{
+	strscpy(compr->id, id, sizeof(compr->id));
+}
+#else
+static inline int snd_compress_proc_init(struct snd_compr *compr)
+{
+	return 0;
+}
+
+static inline void snd_compress_proc_done(struct snd_compr *compr)
+{
+}
+
+static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
+{
+}
+#endif
+
+static int snd_compress_dev_free(struct snd_device *device)
+{
+	struct snd_compr *compr;
+
+	compr = device->device_data;
+	snd_compress_proc_done(compr);
+	put_device(&compr->dev);
+	return 0;
+}
+
+/**
+ * snd_compress_new: create new compress device
+ * @card: sound card pointer
+ * @device: device number
+ * @dirn: device direction, should be of type enum snd_compr_direction
+ * @id: ID string
+ * @compr: compress device pointer
+ *
+ * Return: zero if successful, or a negative error code
+ */
+int snd_compress_new(struct snd_card *card, int device,
+			int dirn, const char *id, struct snd_compr *compr)
+{
+	static const struct snd_device_ops ops = {
+		.dev_free = snd_compress_dev_free,
+		.dev_register = snd_compress_dev_register,
+		.dev_disconnect = snd_compress_dev_disconnect,
+	};
+	int ret;
+
+	compr->card = card;
+	compr->device = device;
+	compr->direction = dirn;
+	mutex_init(&compr->lock);
+
+	snd_compress_set_id(compr, id);
+
+	snd_device_initialize(&compr->dev, card);
+	dev_set_name(&compr->dev, "comprC%iD%i", card->number, device);
+
+	ret = snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
+	if (ret == 0)
+		snd_compress_proc_init(compr);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(snd_compress_new);
+
+MODULE_DESCRIPTION("ALSA Compressed offload framework");
+MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
+MODULE_LICENSE("GPL v2");