compress_offload.c 27.8 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>
#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>

/* 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;
};

/*
 * a note on stream states used:
 * we use follwing 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_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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	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;

	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;

	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 */
	if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
			stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
		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_XRUN:
	case SNDRV_PCM_STATE_SUSPENDED:
	case SNDRV_PCM_STATE_DISCONNECTED:
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		retval = -EBADFD;
		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;
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}

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

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

static unsigned int 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;
	int retval = 0;

	if (snd_BUG_ON(!data))
		return -EFAULT;
	stream = &data->stream;
	if (snd_BUG_ON(!stream))
		return -EFAULT;

	mutex_lock(&stream->device->lock);
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	if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
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		retval = -EBADFD;
		goto out;
	}
	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:
		if (stream->direction == SND_COMPRESS_PLAYBACK)
			retval = POLLOUT | POLLWRNORM | POLLERR;
		else
			retval = POLLIN | POLLRDNORM | POLLERR;
		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;
}

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;
}

/* 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
		 */
		params = kmalloc(sizeof(*params), GFP_KERNEL);
		if (!params)
			return -ENOMEM;
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		if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
			retval = -EFAULT;
			goto out;
		}
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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) {
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		snd_compr_drain_notify(stream);
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		stream->runtime->total_bytes_available = 0;
		stream->runtime->total_bytes_transferred = 0;
683 684 685 686
	}
	return retval;
}

687 688
static int snd_compress_wait_for_drain(struct snd_compr_stream *stream)
{
689 690
	int ret;

691 692 693 694 695 696 697 698 699 700 701
	/*
	 * We are called with lock held. So drop the lock while we wait for
	 * drain complete notfication 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);

702 703 704 705 706 707 708 709 710 711 712 713 714
	/* 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");
	else if (ret)
		pr_debug("wait for drain failed with %d\n", ret);

715 716 717 718

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

719
	return ret;
720 721
}

722 723 724 725 726 727 728
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;
729

730
	retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
731
	if (retval) {
732
		pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval);
733
		wake_up(&stream->runtime->sleep);
734
		return retval;
735
	}
736

737
	return snd_compress_wait_for_drain(stream);
738 739
}

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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;

	/* you can signal next track isf 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;
	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);
773
	if (retval) {
774
		pr_debug("Partial drain returned failure\n");
775 776 777
		wake_up(&stream->runtime->sleep);
		return retval;
	}
778 779

	stream->next_track = false;
780
	return snd_compress_wait_for_drain(stream);
781 782
}

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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;
	if (snd_BUG_ON(!stream))
		return -EFAULT;
	mutex_lock(&stream->device->lock);
	switch (_IOC_NR(cmd)) {
	case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
797
		retval = put_user(SNDRV_COMPRESS_VERSION,
798 799 800 801 802 803 804 805 806 807 808 809 810 811
				(int __user *)arg) ? -EFAULT : 0;
		break;
	case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
		retval = snd_compr_get_caps(stream, arg);
		break;
	case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
		retval = snd_compr_get_codec_caps(stream, arg);
		break;
	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;
812 813 814 815 816 817
	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;
818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838
	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;
839 840 841 842 843 844 845
	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;

846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874
	}
	mutex_unlock(&stream->device->lock);
	return retval;
}

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,
		.mmap =		snd_compr_mmap,
		.poll =		snd_compr_poll,
};

static int snd_compress_dev_register(struct snd_device *device)
{
	int ret = -EINVAL;
	char str[16];
	struct snd_compr *compr;

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

	pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
			compr->direction);
	/* register compressed device */
875 876 877
	ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS,
				  compr->card, compr->device,
				  &snd_compr_file_ops, compr, &compr->dev);
878 879 880 881 882 883 884 885 886 887 888 889 890
	if (ret < 0) {
		pr_err("snd_register_device failed\n %d", ret);
		return ret;
	}
	return ret;

}

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

	compr = device->device_data;
891
	snd_unregister_device(&compr->dev);
892 893 894
	return 0;
}

895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947
#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;
}
948 949 950 951 952

static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
{
	strlcpy(compr->id, id, sizeof(compr->id));
}
953 954 955 956 957 958 959 960 961
#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)
{
}
962 963 964 965

static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
{
}
966 967
#endif

968 969 970 971 972
static int snd_compress_dev_free(struct snd_device *device)
{
	struct snd_compr *compr;

	compr = device->device_data;
973
	snd_compress_proc_done(compr);
974 975 976 977
	put_device(&compr->dev);
	return 0;
}

978 979 980 981 982 983 984 985
/*
 * 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,
986
			int dirn, const char *id, struct snd_compr *compr)
987 988
{
	static struct snd_device_ops ops = {
989
		.dev_free = snd_compress_dev_free,
990 991 992
		.dev_register = snd_compress_dev_register,
		.dev_disconnect = snd_compress_dev_disconnect,
	};
993
	int ret;
994 995 996 997

	compr->card = card;
	compr->device = device;
	compr->direction = dirn;
998

999 1000
	snd_compress_set_id(compr, id);

1001 1002 1003
	snd_device_initialize(&compr->dev, card);
	dev_set_name(&compr->dev, "comprC%iD%i", card->number, device);

1004 1005 1006 1007 1008
	ret = snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
	if (ret == 0)
		snd_compress_proc_init(compr);

	return ret;
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
}
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;

1045
	if (device->name == NULL || device->ops == NULL)
1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092
		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");