sound/soc/soc-compress.c - kernel/msm-4.9 - Gitiles

 /*
  * soc-compress.c  --  ALSA SoC Compress
  *
  * Copyright (C) 2012 Intel Corp.
  *
  * Authors: Namarta Kohli <namartax.kohli@intel.com>
  *          Ramesh Babu K V <ramesh.babu@linux.intel.com>
  *          Vinod Koul <vinod.koul@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;  either version 2 of the  License, or (at your
  *  option) any later version.
  *
  */

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>
 #include <sound/core.h>
 #include <sound/compress_params.h>
 #include <sound/compress_driver.h>
 #include <sound/soc.h>
 #include <sound/initval.h>

 static int soc_compr_open(struct snd_compr_stream *cstream)
 {
 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	int ret = 0;

 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

 	if (platform->driver->compr_ops && platform->driver->compr_ops->open) {
 		ret = platform->driver->compr_ops->open(cstream);
 		if (ret < 0) {
 			pr_err("compress asoc: can't open platform %s\n", platform->name);
 			goto out;
 		}
 	}

 	if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->startup) {
 		ret = rtd->dai_link->compr_ops->startup(cstream);
 		if (ret < 0) {
 			pr_err("compress asoc: %s startup failed\n", rtd->dai_link->name);
 			goto machine_err;
 		}
 	}

 	if (cstream->direction == SND_COMPRESS_PLAYBACK) {
 		cpu_dai->playback_active++;
 		codec_dai->playback_active++;
 	} else {
 		cpu_dai->capture_active++;
 		codec_dai->capture_active++;
 	}

 	cpu_dai->active++;
 	codec_dai->active++;
 	rtd->codec->active++;

 	mutex_unlock(&rtd->pcm_mutex);

 	return 0;

 machine_err:
 	if (platform->driver->compr_ops && platform->driver->compr_ops->free)
 		platform->driver->compr_ops->free(cstream);
 out:
 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }

 /*
  * Power down the audio subsystem pmdown_time msecs after close is called.
  * This is to ensure there are no pops or clicks in between any music tracks
  * due to DAPM power cycling.
  */
 static void close_delayed_work(struct work_struct *work)
 {
 	struct snd_soc_pcm_runtime *rtd =
 			container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;

 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

 	dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
 		 codec_dai->driver->playback.stream_name,
 		 codec_dai->playback_active ? "active" : "inactive",
 		 rtd->pop_wait ? "yes" : "no");

 	/* are we waiting on this codec DAI stream */
 	if (rtd->pop_wait == 1) {
 		rtd->pop_wait = 0;
 		snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 					  SND_SOC_DAPM_STREAM_STOP);
 	}

 	mutex_unlock(&rtd->pcm_mutex);
 }

 static int soc_compr_free(struct snd_compr_stream *cstream)
 {
 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct snd_soc_codec *codec = rtd->codec;

 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

 	if (cstream->direction == SND_COMPRESS_PLAYBACK) {
 		cpu_dai->playback_active--;
 		codec_dai->playback_active--;
 	} else {
 		cpu_dai->capture_active--;
 		codec_dai->capture_active--;
 	}

 	snd_soc_dai_digital_mute(codec_dai, 1, cstream->direction);

 	cpu_dai->active--;
 	codec_dai->active--;
 	codec->active--;

 	if (!cpu_dai->active)
 		cpu_dai->rate = 0;

 	if (!codec_dai->active)
 		codec_dai->rate = 0;


 	if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->shutdown)
 		rtd->dai_link->compr_ops->shutdown(cstream);

 	if (platform->driver->compr_ops && platform->driver->compr_ops->free)
 		platform->driver->compr_ops->free(cstream);
 	cpu_dai->runtime = NULL;

 	if (cstream->direction == SND_COMPRESS_PLAYBACK) {
 		if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
 		    rtd->dai_link->ignore_pmdown_time) {
 			snd_soc_dapm_stream_event(rtd,
 					SNDRV_PCM_STREAM_PLAYBACK,
 					SND_SOC_DAPM_STREAM_STOP);
 		} else {
 			rtd->pop_wait = 1;
 			schedule_delayed_work(&rtd->delayed_work,
 				msecs_to_jiffies(rtd->pmdown_time));
 		}
 	} else {
 		/* capture streams can be powered down now */
 		snd_soc_dapm_stream_event(rtd,
 			SNDRV_PCM_STREAM_CAPTURE,
 			SND_SOC_DAPM_STREAM_STOP);
 	}

 	mutex_unlock(&rtd->pcm_mutex);
 	return 0;
 }

 static int soc_compr_trigger(struct snd_compr_stream *cstream, int cmd)
 {

 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	int ret = 0;

 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

 	if (platform->driver->compr_ops && platform->driver->compr_ops->trigger) {
 		ret = platform->driver->compr_ops->trigger(cstream, cmd);
 		if (ret < 0)
 			goto out;
 	}

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		snd_soc_dai_digital_mute(codec_dai, 0, cstream->direction);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 		snd_soc_dai_digital_mute(codec_dai, 1, cstream->direction);
 		break;
 	}

 out:
 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }

 static int soc_compr_set_params(struct snd_compr_stream *cstream,
 					struct snd_compr_params *params)
 {
 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;
 	int ret = 0;

 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

 	/* first we call set_params for the platform driver
 	 * this should configure the soc side
 	 * if the machine has compressed ops then we call that as well
 	 * expectation is that platform and machine will configure everything
 	 * for this compress path, like configuring pcm port for codec
 	 */
 	if (platform->driver->compr_ops && platform->driver->compr_ops->set_params) {
 		ret = platform->driver->compr_ops->set_params(cstream, params);
 		if (ret < 0)
 			goto out;
 	}

 	if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->set_params) {
 		ret = rtd->dai_link->compr_ops->set_params(cstream);
 		if (ret < 0)
 			goto out;
 	}

 	snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 				SND_SOC_DAPM_STREAM_START);

 out:
 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }

 static int soc_compr_get_params(struct snd_compr_stream *cstream,
 					struct snd_codec *params)
 {
 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;
 	int ret = 0;

 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

 	if (platform->driver->compr_ops && platform->driver->compr_ops->get_params)
 		ret = platform->driver->compr_ops->get_params(cstream, params);

 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }

 static int soc_compr_get_caps(struct snd_compr_stream *cstream,
 				struct snd_compr_caps *caps)
 {
 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;
 	int ret = 0;

 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

 	if (platform->driver->compr_ops && platform->driver->compr_ops->get_caps)
 		ret = platform->driver->compr_ops->get_caps(cstream, caps);

 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }

 static int soc_compr_get_codec_caps(struct snd_compr_stream *cstream,
 				struct snd_compr_codec_caps *codec)
 {
 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;
 	int ret = 0;

 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

 	if (platform->driver->compr_ops && platform->driver->compr_ops->get_codec_caps)
 		ret = platform->driver->compr_ops->get_codec_caps(cstream, codec);

 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }

 static int soc_compr_ack(struct snd_compr_stream *cstream, size_t bytes)
 {
 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;
 	int ret = 0;

 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

 	if (platform->driver->compr_ops && platform->driver->compr_ops->ack)
 		ret = platform->driver->compr_ops->ack(cstream, bytes);

 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }

 static int soc_compr_pointer(struct snd_compr_stream *cstream,
 			struct snd_compr_tstamp *tstamp)
 {
 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;

 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

 	if (platform->driver->compr_ops && platform->driver->compr_ops->pointer)
 		 platform->driver->compr_ops->pointer(cstream, tstamp);

 	mutex_unlock(&rtd->pcm_mutex);
 	return 0;
 }

 static int soc_compr_copy(struct snd_compr_stream *cstream,
 			  const char __user *buf, size_t count)
 {
 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;
 	int ret = 0;

 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

 	if (platform->driver->compr_ops && platform->driver->compr_ops->copy)
 		ret = platform->driver->compr_ops->copy(cstream, buf, count);

 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }

 /* ASoC Compress operations */
 static struct snd_compr_ops soc_compr_ops = {
 	.open		= soc_compr_open,
 	.free		= soc_compr_free,
 	.set_params	= soc_compr_set_params,
 	.get_params	= soc_compr_get_params,
 	.trigger	= soc_compr_trigger,
 	.pointer	= soc_compr_pointer,
 	.ack		= soc_compr_ack,
 	.get_caps	= soc_compr_get_caps,
 	.get_codec_caps = soc_compr_get_codec_caps
 };

 /* create a new compress */
 int soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
 {
 	struct snd_soc_codec *codec = rtd->codec;
 	struct snd_soc_platform *platform = rtd->platform;
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	struct snd_compr *compr;
 	char new_name[64];
 	int ret = 0, direction = 0;

 	/* check client and interface hw capabilities */
 	snprintf(new_name, sizeof(new_name), "%s %s-%d",
 			rtd->dai_link->stream_name, codec_dai->name, num);
 	direction = SND_COMPRESS_PLAYBACK;
 	compr = kzalloc(sizeof(*compr), GFP_KERNEL);
 	if (compr == NULL) {
 		snd_printk(KERN_ERR "Cannot allocate compr\n");
 		return -ENOMEM;
 	}

 	compr->ops = devm_kzalloc(rtd->card->dev, sizeof(soc_compr_ops),
 				  GFP_KERNEL);
 	if (compr->ops == NULL) {
 		dev_err(rtd->card->dev, "Cannot allocate compressed ops\n");
 		ret = -ENOMEM;
 		goto compr_err;
 	}
 	memcpy(compr->ops, &soc_compr_ops, sizeof(soc_compr_ops));

 	/* Add copy callback for not memory mapped DSPs */
 	if (platform->driver->compr_ops && platform->driver->compr_ops->copy)
 		compr->ops->copy = soc_compr_copy;

 	mutex_init(&compr->lock);
 	ret = snd_compress_new(rtd->card->snd_card, num, direction, compr);
 	if (ret < 0) {
 		pr_err("compress asoc: can't create compress for codec %s\n",
 			codec->name);
 		goto compr_err;
 	}

 	/* DAPM dai link stream work */
 	INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);

 	rtd->compr = compr;
 	compr->private_data = rtd;

 	printk(KERN_INFO "compress asoc: %s <-> %s mapping ok\n", codec_dai->name,
 		cpu_dai->name);
 	return ret;

 compr_err:
 	kfree(compr);
 	return ret;
 }
	/*
	* soc-compress.c -- ALSA SoC Compress
	*
	* Copyright (C) 2012 Intel Corp.
	*
	* Authors: Namarta Kohli <namartax.kohli@intel.com>
	* Ramesh Babu K V <ramesh.babu@linux.intel.com>
	* Vinod Koul <vinod.koul@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; either version 2 of the License, or (at your
	* option) any later version.
	*
	*/

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/slab.h>
	#include <linux/workqueue.h>
	#include <sound/core.h>
	#include <sound/compress_params.h>
	#include <sound/compress_driver.h>
	#include <sound/soc.h>
	#include <sound/initval.h>

	static int soc_compr_open(struct snd_compr_stream *cstream)
	{
	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	struct snd_soc_platform *platform = rtd->platform;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	int ret = 0;

	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

	if (platform->driver->compr_ops && platform->driver->compr_ops->open) {
	ret = platform->driver->compr_ops->open(cstream);
	if (ret < 0) {
	pr_err("compress asoc: can't open platform %s\n", platform->name);
	goto out;
	}
	}

	if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->startup) {
	ret = rtd->dai_link->compr_ops->startup(cstream);
	if (ret < 0) {
	pr_err("compress asoc: %s startup failed\n", rtd->dai_link->name);
	goto machine_err;
	}
	}

	if (cstream->direction == SND_COMPRESS_PLAYBACK) {
	cpu_dai->playback_active++;
	codec_dai->playback_active++;
	} else {
	cpu_dai->capture_active++;
	codec_dai->capture_active++;
	}

	cpu_dai->active++;
	codec_dai->active++;
	rtd->codec->active++;

	mutex_unlock(&rtd->pcm_mutex);

	return 0;

	machine_err:
	if (platform->driver->compr_ops && platform->driver->compr_ops->free)
	platform->driver->compr_ops->free(cstream);
	out:
	mutex_unlock(&rtd->pcm_mutex);
	return ret;
	}

	/*
	* Power down the audio subsystem pmdown_time msecs after close is called.
	* This is to ensure there are no pops or clicks in between any music tracks
	* due to DAPM power cycling.
	*/
	static void close_delayed_work(struct work_struct *work)
	{
	struct snd_soc_pcm_runtime *rtd =
	container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
	struct snd_soc_dai *codec_dai = rtd->codec_dai;

	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

	dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
	codec_dai->driver->playback.stream_name,
	codec_dai->playback_active ? "active" : "inactive",
	rtd->pop_wait ? "yes" : "no");

	/* are we waiting on this codec DAI stream */
	if (rtd->pop_wait == 1) {
	rtd->pop_wait = 0;
	snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
	SND_SOC_DAPM_STREAM_STOP);
	}

	mutex_unlock(&rtd->pcm_mutex);
	}

	static int soc_compr_free(struct snd_compr_stream *cstream)
	{
	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	struct snd_soc_platform *platform = rtd->platform;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_codec *codec = rtd->codec;

	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

	if (cstream->direction == SND_COMPRESS_PLAYBACK) {
	cpu_dai->playback_active--;
	codec_dai->playback_active--;
	} else {
	cpu_dai->capture_active--;
	codec_dai->capture_active--;
	}

	snd_soc_dai_digital_mute(codec_dai, 1, cstream->direction);

	cpu_dai->active--;
	codec_dai->active--;
	codec->active--;

	if (!cpu_dai->active)
	cpu_dai->rate = 0;

	if (!codec_dai->active)
	codec_dai->rate = 0;


	if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->shutdown)
	rtd->dai_link->compr_ops->shutdown(cstream);

	if (platform->driver->compr_ops && platform->driver->compr_ops->free)
	platform->driver->compr_ops->free(cstream);
	cpu_dai->runtime = NULL;

	if (cstream->direction == SND_COMPRESS_PLAYBACK) {
	if (!rtd->pmdown_time \|\| codec->ignore_pmdown_time \|\|
	rtd->dai_link->ignore_pmdown_time) {
	snd_soc_dapm_stream_event(rtd,
	SNDRV_PCM_STREAM_PLAYBACK,
	SND_SOC_DAPM_STREAM_STOP);
	} else {
	rtd->pop_wait = 1;
	schedule_delayed_work(&rtd->delayed_work,
	msecs_to_jiffies(rtd->pmdown_time));
	}
	} else {
	/* capture streams can be powered down now */
	snd_soc_dapm_stream_event(rtd,
	SNDRV_PCM_STREAM_CAPTURE,
	SND_SOC_DAPM_STREAM_STOP);
	}

	mutex_unlock(&rtd->pcm_mutex);
	return 0;
	}

	static int soc_compr_trigger(struct snd_compr_stream *cstream, int cmd)
	{

	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	struct snd_soc_platform *platform = rtd->platform;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	int ret = 0;

	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

	if (platform->driver->compr_ops && platform->driver->compr_ops->trigger) {
	ret = platform->driver->compr_ops->trigger(cstream, cmd);
	if (ret < 0)
	goto out;
	}

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	snd_soc_dai_digital_mute(codec_dai, 0, cstream->direction);
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	snd_soc_dai_digital_mute(codec_dai, 1, cstream->direction);
	break;
	}

	out:
	mutex_unlock(&rtd->pcm_mutex);
	return ret;
	}

	static int soc_compr_set_params(struct snd_compr_stream *cstream,
	struct snd_compr_params *params)
	{
	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	struct snd_soc_platform *platform = rtd->platform;
	int ret = 0;

	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

	/* first we call set_params for the platform driver
	* this should configure the soc side
	* if the machine has compressed ops then we call that as well
	* expectation is that platform and machine will configure everything
	* for this compress path, like configuring pcm port for codec
	*/
	if (platform->driver->compr_ops && platform->driver->compr_ops->set_params) {
	ret = platform->driver->compr_ops->set_params(cstream, params);
	if (ret < 0)
	goto out;
	}

	if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->set_params) {
	ret = rtd->dai_link->compr_ops->set_params(cstream);
	if (ret < 0)
	goto out;
	}

	snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
	SND_SOC_DAPM_STREAM_START);

	out:
	mutex_unlock(&rtd->pcm_mutex);
	return ret;
	}

	static int soc_compr_get_params(struct snd_compr_stream *cstream,
	struct snd_codec *params)
	{
	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	struct snd_soc_platform *platform = rtd->platform;
	int ret = 0;

	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

	if (platform->driver->compr_ops && platform->driver->compr_ops->get_params)
	ret = platform->driver->compr_ops->get_params(cstream, params);

	mutex_unlock(&rtd->pcm_mutex);
	return ret;
	}

	static int soc_compr_get_caps(struct snd_compr_stream *cstream,
	struct snd_compr_caps *caps)
	{
	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	struct snd_soc_platform *platform = rtd->platform;
	int ret = 0;

	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

	if (platform->driver->compr_ops && platform->driver->compr_ops->get_caps)
	ret = platform->driver->compr_ops->get_caps(cstream, caps);

	mutex_unlock(&rtd->pcm_mutex);
	return ret;
	}

	static int soc_compr_get_codec_caps(struct snd_compr_stream *cstream,
	struct snd_compr_codec_caps *codec)
	{
	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	struct snd_soc_platform *platform = rtd->platform;
	int ret = 0;

	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

	if (platform->driver->compr_ops && platform->driver->compr_ops->get_codec_caps)
	ret = platform->driver->compr_ops->get_codec_caps(cstream, codec);

	mutex_unlock(&rtd->pcm_mutex);
	return ret;
	}

	static int soc_compr_ack(struct snd_compr_stream *cstream, size_t bytes)
	{
	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	struct snd_soc_platform *platform = rtd->platform;
	int ret = 0;

	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

	if (platform->driver->compr_ops && platform->driver->compr_ops->ack)
	ret = platform->driver->compr_ops->ack(cstream, bytes);

	mutex_unlock(&rtd->pcm_mutex);
	return ret;
	}

	static int soc_compr_pointer(struct snd_compr_stream *cstream,
	struct snd_compr_tstamp *tstamp)
	{
	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	struct snd_soc_platform *platform = rtd->platform;

	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

	if (platform->driver->compr_ops && platform->driver->compr_ops->pointer)
	platform->driver->compr_ops->pointer(cstream, tstamp);

	mutex_unlock(&rtd->pcm_mutex);
	return 0;
	}

	static int soc_compr_copy(struct snd_compr_stream *cstream,
	const char __user *buf, size_t count)
	{
	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	struct snd_soc_platform *platform = rtd->platform;
	int ret = 0;

	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

	if (platform->driver->compr_ops && platform->driver->compr_ops->copy)
	ret = platform->driver->compr_ops->copy(cstream, buf, count);

	mutex_unlock(&rtd->pcm_mutex);
	return ret;
	}

	/* ASoC Compress operations */
	static struct snd_compr_ops soc_compr_ops = {
	.open = soc_compr_open,
	.free = soc_compr_free,
	.set_params = soc_compr_set_params,
	.get_params = soc_compr_get_params,
	.trigger = soc_compr_trigger,
	.pointer = soc_compr_pointer,
	.ack = soc_compr_ack,
	.get_caps = soc_compr_get_caps,
	.get_codec_caps = soc_compr_get_codec_caps
	};

	/* create a new compress */
	int soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
	{
	struct snd_soc_codec *codec = rtd->codec;
	struct snd_soc_platform *platform = rtd->platform;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct snd_compr *compr;
	char new_name[64];
	int ret = 0, direction = 0;

	/* check client and interface hw capabilities */
	snprintf(new_name, sizeof(new_name), "%s %s-%d",
	rtd->dai_link->stream_name, codec_dai->name, num);
	direction = SND_COMPRESS_PLAYBACK;
	compr = kzalloc(sizeof(*compr), GFP_KERNEL);
	if (compr == NULL) {
	snd_printk(KERN_ERR "Cannot allocate compr\n");
	return -ENOMEM;
	}

	compr->ops = devm_kzalloc(rtd->card->dev, sizeof(soc_compr_ops),
	GFP_KERNEL);
	if (compr->ops == NULL) {
	dev_err(rtd->card->dev, "Cannot allocate compressed ops\n");
	ret = -ENOMEM;
	goto compr_err;
	}
	memcpy(compr->ops, &soc_compr_ops, sizeof(soc_compr_ops));

	/* Add copy callback for not memory mapped DSPs */
	if (platform->driver->compr_ops && platform->driver->compr_ops->copy)
	compr->ops->copy = soc_compr_copy;

	mutex_init(&compr->lock);
	ret = snd_compress_new(rtd->card->snd_card, num, direction, compr);
	if (ret < 0) {
	pr_err("compress asoc: can't create compress for codec %s\n",
	codec->name);
	goto compr_err;
	}

	/* DAPM dai link stream work */
	INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);

	rtd->compr = compr;
	compr->private_data = rtd;

	printk(KERN_INFO "compress asoc: %s <-> %s mapping ok\n", codec_dai->name,
	cpu_dai->name);
	return ret;

	compr_err:
	kfree(compr);
	return ret;
	}