compress_offload.c 29.7 KB
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/*
 *  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>
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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; version 2 of the License.
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 */
#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>
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#include <linux/math64.h>
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#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/uio.h>
#include <linux/uaccess.h>
#include <linux/module.h>
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#include <linux/compat.h>
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#include <sound/core.h>
#include <sound/initval.h>
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#include <sound/info.h>
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#include <sound/compress_params.h>
#include <sound/compress_offload.h>
#include <sound/compress_driver.h>

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/* 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

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/* 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
 */

static DEFINE_MUTEX(device_mutex);

struct snd_compr_file {
	unsigned long caps;
	struct snd_compr_stream stream;
};

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static void error_delayed_work(struct work_struct *work);

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/*
 * a note on stream states used:
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 * we use following states in the compressed core
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 * SNDRV_PCM_STATE_OPEN: When stream has been opened.
 * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
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 *	calling SNDRV_COMPRESS_SET_PARAMS. Running streams will come to this
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 *	state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
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 * 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.
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 * 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;

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	if ((f->f_flags & O_ACCMODE) == O_WRONLY)
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		dirn = SND_COMPRESS_PLAYBACK;
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	else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
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		dirn = SND_COMPRESS_CAPTURE;
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	else
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		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");
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		snd_card_unref(compr->card);
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		return -EINVAL;
	}

	data = kzalloc(sizeof(*data), GFP_KERNEL);
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	if (!data) {
		snd_card_unref(compr->card);
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		return -ENOMEM;
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	}
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	INIT_DELAYED_WORK(&data->stream.error_work, error_delayed_work);

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	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);
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		snd_card_unref(compr->card);
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		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);
	}
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	snd_card_unref(compr->card);
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	return ret;
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}

static int snd_compr_free(struct inode *inode, struct file *f)
{
	struct snd_compr_file *data = f->private_data;
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	struct snd_compr_runtime *runtime = data->stream.runtime;

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	cancel_delayed_work_sync(&data->stream.error_work);

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	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;
	}

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	data->stream.ops->free(&data->stream);
	kfree(data->stream.runtime->buffer);
	kfree(data->stream.runtime);
	kfree(data);
	return 0;
}

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static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
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		struct snd_compr_tstamp *tstamp)
{
	if (!stream->ops->pointer)
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		return -ENOTSUPP;
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	stream->ops->pointer(stream, tstamp);
	pr_debug("dsp consumed till %d total %d bytes\n",
		tstamp->byte_offset, tstamp->copied_total);
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	if (stream->direction == SND_COMPRESS_PLAYBACK)
		stream->runtime->total_bytes_transferred = tstamp->copied_total;
	else
		stream->runtime->total_bytes_available = tstamp->copied_total;
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	return 0;
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}

static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
		struct snd_compr_avail *avail)
{
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	memset(avail, 0, sizeof(*avail));
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	snd_compr_update_tstamp(stream, &avail->tstamp);
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	/* Still need to return avail even if tstamp can't be filled in */
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	if (stream->runtime->total_bytes_available == 0 &&
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			stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
			stream->direction == SND_COMPRESS_PLAYBACK) {
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		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) {
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		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;
		}
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	}

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	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;

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	pr_debug("ret avail as %lld\n", avail->avail);
	return avail->avail;
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}

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;

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	switch (stream->runtime->state) {
	case SNDRV_PCM_STATE_OPEN:
		return -EBADFD;
	case SNDRV_PCM_STATE_XRUN:
		return -EPIPE;
	default:
		break;
	}

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	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;
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	/* 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);
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	dstn = runtime->buffer + app_pointer;
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	pr_debug("copying %ld at %lld\n",
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			(unsigned long)count, app_pointer);
	if (count < runtime->buffer_size - app_pointer) {
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		if (copy_from_user(dstn, buf, count))
			return -EFAULT;
	} else {
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		copy = runtime->buffer_size - app_pointer;
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		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 */
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	switch (stream->runtime->state) {
	case SNDRV_PCM_STATE_SETUP:
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_RUNNING:
		break;
	default:
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		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;

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	if (stream->ops->copy) {
		char __user* cbuf = (char __user*)buf;
		retval = stream->ops->copy(stream, cbuf, avail);
	} else {
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		retval = snd_compr_write_data(stream, buf, avail);
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	}
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	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)
{
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	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);

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	/* 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:
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		retval = -EBADFD;
		goto out;
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	case SNDRV_PCM_STATE_XRUN:
		retval = -EPIPE;
		goto out;
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	}

	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;
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}

static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
{
	return -ENXIO;
}

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static __poll_t snd_compr_get_poll(struct snd_compr_stream *stream)
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{
	if (stream->direction == SND_COMPRESS_PLAYBACK)
		return POLLOUT | POLLWRNORM;
	else
		return POLLIN | POLLRDNORM;
}

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static __poll_t snd_compr_poll(struct file *f, poll_table *wait)
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{
	struct snd_compr_file *data = f->private_data;
	struct snd_compr_stream *stream;
	size_t avail;
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	__poll_t retval = 0;
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	if (snd_BUG_ON(!data))
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		return POLLERR;
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	stream = &data->stream;

	mutex_lock(&stream->device->lock);
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	switch (stream->runtime->state) {
	case SNDRV_PCM_STATE_OPEN:
	case SNDRV_PCM_STATE_XRUN:
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		retval = snd_compr_get_poll(stream) | POLLERR;
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		goto out;
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	default:
		break;
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	}
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	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:
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		retval = snd_compr_get_poll(stream) | POLLERR;
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		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;

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	memset(&caps, 0, sizeof(caps));
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	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;
}

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#ifndef COMPR_CODEC_CAPS_OVERFLOW
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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;

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	caps = kzalloc(sizeof(*caps), GFP_KERNEL);
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	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;
}
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#endif /* !COMPR_CODEC_CAPS_OVERFLOW */
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/* 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;

	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 {
		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;
}

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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 ||
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	    params->buffer.fragments > INT_MAX / params->buffer.fragment_size)
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		return -EINVAL;

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	/* 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;

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	return 0;
}

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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
		 */
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		params = memdup_user((void __user *)arg, sizeof(*params));
		if (IS_ERR(params))
			return PTR_ERR(params);
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		retval = snd_compress_check_input(params);
		if (retval)
			goto out;

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		retval = snd_compr_allocate_buffer(stream, params);
		if (retval) {
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			retval = -ENOMEM;
			goto out;
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		}
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		retval = stream->ops->set_params(stream, params);
		if (retval)
			goto out;
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		stream->metadata_set = false;
		stream->next_track = false;
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		if (stream->direction == SND_COMPRESS_PLAYBACK)
			stream->runtime->state = SNDRV_PCM_STATE_SETUP;
		else
			stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
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	} else {
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		return -EPERM;
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	}
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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;

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	params = kzalloc(sizeof(*params), GFP_KERNEL);
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	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;
}

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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;
}

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static inline int
snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
{
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	struct snd_compr_tstamp tstamp = {0};
	int ret;
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	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;
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}

static int snd_compr_pause(struct snd_compr_stream *stream)
{
	int retval;

	if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
		return -EPERM;
	retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
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	if (!retval)
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		stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
	return retval;
}

static int snd_compr_resume(struct snd_compr_stream *stream)
{
	int retval;

	if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
		return -EPERM;
	retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
	if (!retval)
		stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
	return retval;
}

static int snd_compr_start(struct snd_compr_stream *stream)
{
	int retval;

	if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
		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;

	if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
			stream->runtime->state == SNDRV_PCM_STATE_SETUP)
		return -EPERM;
	retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
	if (!retval) {
713
		snd_compr_drain_notify(stream);
714 715
		stream->runtime->total_bytes_available = 0;
		stream->runtime->total_bytes_transferred = 0;
716 717 718 719
	}
	return retval;
}

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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.
 */
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);

759 760
static int snd_compress_wait_for_drain(struct snd_compr_stream *stream)
{
761 762
	int ret;

763 764
	/*
	 * We are called with lock held. So drop the lock while we wait for
765
	 * drain complete notification from the driver
766 767 768 769 770 771 772 773
	 *
	 * 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);

774 775 776 777 778 779 780 781 782
	/* 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)
783
		pr_debug("wait aborted by a signal\n");
784 785 786
	else if (ret)
		pr_debug("wait for drain failed with %d\n", ret);

787 788 789 790

	wake_up(&stream->runtime->sleep);
	mutex_lock(&stream->device->lock);

791
	return ret;
792 793
}

794 795 796 797 798 799 800
static int snd_compr_drain(struct snd_compr_stream *stream)
{
	int retval;

	if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
			stream->runtime->state == SNDRV_PCM_STATE_SETUP)
		return -EPERM;
801

802
	retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
803
	if (retval) {
804
		pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval);
805
		wake_up(&stream->runtime->sleep);
806
		return retval;
807
	}
808

809
	return snd_compress_wait_for_drain(stream);
810 811
}

812 813 814 815 816 817 818 819
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;

820
	/* you can signal next track if this is intended to be a gapless stream
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	 * 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;
	if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
			stream->runtime->state == SNDRV_PCM_STATE_SETUP)
		return -EPERM;
	/* stream can be drained only when next track has been signalled */
	if (stream->next_track == false)
		return -EPERM;

	retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
845
	if (retval) {
846
		pr_debug("Partial drain returned failure\n");
847 848 849
		wake_up(&stream->runtime->sleep);
		return retval;
	}
850 851

	stream->next_track = false;
852
	return snd_compress_wait_for_drain(stream);
853 854
}

855 856 857 858 859 860 861 862
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;
863

864
	stream = &data->stream;
865

866 867 868
	mutex_lock(&stream->device->lock);
	switch (_IOC_NR(cmd)) {
	case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
869
		retval = put_user(SNDRV_COMPRESS_VERSION,
870 871 872 873 874
				(int __user *)arg) ? -EFAULT : 0;
		break;
	case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
		retval = snd_compr_get_caps(stream, arg);
		break;
875
#ifndef COMPR_CODEC_CAPS_OVERFLOW
876 877 878
	case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
		retval = snd_compr_get_codec_caps(stream, arg);
		break;
879
#endif
880 881 882 883 884 885
	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;
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	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;
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	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;
913 914 915 916 917 918 919
	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;

920 921 922 923 924
	}
	mutex_unlock(&stream->device->lock);
	return retval;
}

925 926 927 928 929 930 931 932 933
/* 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

934 935 936 937 938 939 940
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,
941 942 943
#ifdef CONFIG_COMPAT
		.compat_ioctl = snd_compr_ioctl_compat,
#endif
944 945 946 947 948 949 950 951 952 953 954 955 956
		.mmap =		snd_compr_mmap,
		.poll =		snd_compr_poll,
};

static int snd_compress_dev_register(struct snd_device *device)
{
	int ret = -EINVAL;
	struct snd_compr *compr;

	if (snd_BUG_ON(!device || !device->device_data))
		return -EBADFD;
	compr = device->device_data;

957
	pr_debug("reg device %s, direction %d\n", compr->name,
958 959
			compr->direction);
	/* register compressed device */
960 961 962
	ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS,
				  compr->card, compr->device,
				  &snd_compr_file_ops, compr, &compr->dev);
963
	if (ret < 0) {
964
		pr_err("snd_register_device failed %d\n", ret);
965 966 967 968 969 970 971 972 973 974 975
		return ret;
	}
	return ret;

}

static int snd_compress_dev_disconnect(struct snd_device *device)
{
	struct snd_compr *compr;

	compr = device->device_data;
976
	snd_unregister_device(&compr->dev);
977 978 979
	return 0;
}

980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
#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 | S_IRUGO | S_IXUGO;
	if (snd_info_register(entry) < 0) {
		snd_info_free_entry(entry);
		return -ENOMEM;
	}
	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);
		if (snd_info_register(entry) < 0) {
			snd_info_free_entry(entry);
			entry = NULL;
		}
	}
	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;
}
1033 1034 1035 1036 1037

static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
{
	strlcpy(compr->id, id, sizeof(compr->id));
}
1038 1039 1040 1041 1042 1043 1044 1045 1046
#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)
{
}
1047 1048 1049 1050

static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
{
}
1051 1052
#endif

1053 1054 1055 1056 1057
static int snd_compress_dev_free(struct snd_device *device)
{
	struct snd_compr *compr;

	compr = device->device_data;
1058
	snd_compress_proc_done(compr);
1059 1060 1061 1062
	put_device(&compr->dev);
	return 0;
}

1063 1064 1065 1066 1067 1068 1069 1070
/*
 * 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
 * @compr: compress device pointer
 */
int snd_compress_new(struct snd_card *card, int device,
1071
			int dirn, const char *id, struct snd_compr *compr)
1072 1073
{
	static struct snd_device_ops ops = {
1074
		.dev_free = snd_compress_dev_free,
1075 1076 1077
		.dev_register = snd_compress_dev_register,
		.dev_disconnect = snd_compress_dev_disconnect,
	};
1078
	int ret;
1079 1080 1081 1082

	compr->card = card;
	compr->device = device;
	compr->direction = dirn;
1083

1084 1085
	snd_compress_set_id(compr, id);

1086 1087 1088
	snd_device_initialize(&compr->dev, card);
	dev_set_name(&compr->dev, "comprC%iD%i", card->number, device);

1089 1090 1091 1092 1093
	ret = snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
	if (ret == 0)
		snd_compress_proc_init(compr);

	return ret;
1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
}
EXPORT_SYMBOL_GPL(snd_compress_new);

static int snd_compress_add_device(struct snd_compr *device)
{
	int ret;

	if (!device->card)
		return -EINVAL;

	/* register the card */
	ret = snd_card_register(device->card);
	if (ret)
		goto out;
	return 0;

out:
	pr_err("failed with %d\n", ret);
	return ret;

}

static int snd_compress_remove_device(struct snd_compr *device)
{
	return snd_card_free(device->card);
}

/**
 * snd_compress_register - register compressed device
 *
 * @device: compressed device to register
 */
int snd_compress_register(struct snd_compr *device)
{
	int retval;

1130
	if (device->name == NULL || device->ops == NULL)
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177
		return -EINVAL;

	pr_debug("Registering compressed device %s\n", device->name);
	if (snd_BUG_ON(!device->ops->open))
		return -EINVAL;
	if (snd_BUG_ON(!device->ops->free))
		return -EINVAL;
	if (snd_BUG_ON(!device->ops->set_params))
		return -EINVAL;
	if (snd_BUG_ON(!device->ops->trigger))
		return -EINVAL;

	mutex_init(&device->lock);

	/* register a compressed card */
	mutex_lock(&device_mutex);
	retval = snd_compress_add_device(device);
	mutex_unlock(&device_mutex);
	return retval;
}
EXPORT_SYMBOL_GPL(snd_compress_register);

int snd_compress_deregister(struct snd_compr *device)
{
	pr_debug("Removing compressed device %s\n", device->name);
	mutex_lock(&device_mutex);
	snd_compress_remove_device(device);
	mutex_unlock(&device_mutex);
	return 0;
}
EXPORT_SYMBOL_GPL(snd_compress_deregister);

static int __init snd_compress_init(void)
{
	return 0;
}

static void __exit snd_compress_exit(void)
{
}

module_init(snd_compress_init);
module_exit(snd_compress_exit);

MODULE_DESCRIPTION("ALSA Compressed offload framework");
MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
MODULE_LICENSE("GPL v2");