[mirror_ubuntu-zesty-kernel.git] / sound / soc / soc-compress.c

/*
 * 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;
}

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);

	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;
	}

	if (cmd == SNDRV_PCM_TRIGGER_START)
		snd_soc_dai_digital_mute(codec_dai, 0);
	else if (cmd == SNDRV_PCM_TRIGGER_STOP)
		snd_soc_dai_digital_mute(codec_dai, 1);

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;
}

/* 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_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 = &soc_compr_ops;
	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);
		kfree(compr);
		return ret;
	}

	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;
}
Commit	Line	Data
1245b700 NK	1	/*
	2	* soc-compress.c -- ALSA SoC Compress
	3	*
	4	* Copyright (C) 2012 Intel Corp.
	5	*
	6	* Authors: Namarta Kohli <namartax.kohli@intel.com>
	7	* Ramesh Babu K V <ramesh.babu@linux.intel.com>
	8	* Vinod Koul <vinod.koul@linux.intel.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the
	12	* Free Software Foundation; either version 2 of the License, or (at your
	13	* option) any later version.
	14	*
	15	*/
	16
	17	#include <linux/kernel.h>
	18	#include <linux/init.h>
	19	#include <linux/delay.h>
	20	#include <linux/slab.h>
	21	#include <linux/workqueue.h>
	22	#include <sound/core.h>
	23	#include <sound/compress_params.h>
	24	#include <sound/compress_driver.h>
	25	#include <sound/soc.h>
	26	#include <sound/initval.h>
	27
	28	static int soc_compr_open(struct snd_compr_stream *cstream)
	29	{
	30	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	31	struct snd_soc_platform *platform = rtd->platform;
	32	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	33	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	34	int ret = 0;
	35
15e2e619 CK	36	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
15e2e619 CK	37
1245b700 NK	38	if (platform->driver->compr_ops && platform->driver->compr_ops->open) {
	39	ret = platform->driver->compr_ops->open(cstream);
	40	if (ret < 0) {
	41	pr_err("compress asoc: can't open platform %s\n", platform->name);
	42	goto out;
	43	}
	44	}
	45
	46	if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->startup) {
	47	ret = rtd->dai_link->compr_ops->startup(cstream);
	48	if (ret < 0) {
	49	pr_err("compress asoc: %s startup failed\n", rtd->dai_link->name);
	50	goto machine_err;
	51	}
	52	}
	53
	54	if (cstream->direction == SND_COMPRESS_PLAYBACK) {
	55	cpu_dai->playback_active++;
	56	codec_dai->playback_active++;
	57	} else {
	58	cpu_dai->capture_active++;
	59	codec_dai->capture_active++;
	60	}
	61
	62	cpu_dai->active++;
	63	codec_dai->active++;
	64	rtd->codec->active++;
	65
15e2e619 CK	66	mutex_unlock(&rtd->pcm_mutex);
15e2e619 CK	67
1245b700 NK	68	return 0;
	69
	70	machine_err:
	71	if (platform->driver->compr_ops && platform->driver->compr_ops->free)
	72	platform->driver->compr_ops->free(cstream);
	73	out:
15e2e619	74	mutex_unlock(&rtd->pcm_mutex);
1245b700 NK	75	return ret;
	76	}
	77
	78	static int soc_compr_free(struct snd_compr_stream *cstream)
	79	{
	80	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	81	struct snd_soc_platform *platform = rtd->platform;
	82	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	83	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	84	struct snd_soc_codec *codec = rtd->codec;
	85
15e2e619 CK	86	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
15e2e619 CK	87
1245b700 NK	88	if (cstream->direction == SND_COMPRESS_PLAYBACK) {
	89	cpu_dai->playback_active--;
	90	codec_dai->playback_active--;
	91	} else {
	92	cpu_dai->capture_active--;
	93	codec_dai->capture_active--;
	94	}
	95
	96	snd_soc_dai_digital_mute(codec_dai, 1);
	97
	98	cpu_dai->active--;
	99	codec_dai->active--;
	100	codec->active--;
	101
	102	if (!cpu_dai->active)
	103	cpu_dai->rate = 0;
	104
	105	if (!codec_dai->active)
	106	codec_dai->rate = 0;
	107
	108
	109	if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->shutdown)
	110	rtd->dai_link->compr_ops->shutdown(cstream);
	111
	112	if (platform->driver->compr_ops && platform->driver->compr_ops->free)
	113	platform->driver->compr_ops->free(cstream);
9d2667a9	114	cpu_dai->runtime = NULL;
1245b700 NK	115
	116	if (cstream->direction == SND_COMPRESS_PLAYBACK) {
	117	if (!rtd->pmdown_time \|\| codec->ignore_pmdown_time \|\|
	118	rtd->dai_link->ignore_pmdown_time) {
	119	snd_soc_dapm_stream_event(rtd,
	120	SNDRV_PCM_STREAM_PLAYBACK,
	121	SND_SOC_DAPM_STREAM_STOP);
8c3d2aa4	122	} else {
9bffb1fb	123	rtd->pop_wait = 1;
1245b700 NK	124	schedule_delayed_work(&rtd->delayed_work,
1245b700 NK	125	msecs_to_jiffies(rtd->pmdown_time));
8c3d2aa4	126	}
1245b700 NK	127	} else {
	128	/* capture streams can be powered down now */
	129	snd_soc_dapm_stream_event(rtd,
	130	SNDRV_PCM_STREAM_CAPTURE,
	131	SND_SOC_DAPM_STREAM_STOP);
	132	}
	133
15e2e619	134	mutex_unlock(&rtd->pcm_mutex);
1245b700 NK	135	return 0;
	136	}
	137
	138	static int soc_compr_trigger(struct snd_compr_stream *cstream, int cmd)
	139	{
	140
	141	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	142	struct snd_soc_platform *platform = rtd->platform;
	143	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	144	int ret = 0;
	145
15e2e619 CK	146	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
15e2e619 CK	147
1245b700 NK	148	if (platform->driver->compr_ops && platform->driver->compr_ops->trigger) {
	149	ret = platform->driver->compr_ops->trigger(cstream, cmd);
	150	if (ret < 0)
15e2e619	151	goto out;
1245b700 NK	152	}
	153
	154	if (cmd == SNDRV_PCM_TRIGGER_START)
	155	snd_soc_dai_digital_mute(codec_dai, 0);
	156	else if (cmd == SNDRV_PCM_TRIGGER_STOP)
	157	snd_soc_dai_digital_mute(codec_dai, 1);
	158
15e2e619 CK	159	out:
15e2e619 CK	160	mutex_unlock(&rtd->pcm_mutex);
1245b700 NK	161	return ret;
	162	}
	163
	164	static int soc_compr_set_params(struct snd_compr_stream *cstream,
	165	struct snd_compr_params *params)
	166	{
	167	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	168	struct snd_soc_platform *platform = rtd->platform;
1245b700 NK	169	int ret = 0;
1245b700 NK	170
15e2e619 CK	171	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
15e2e619 CK	172
1245b700 NK	173	/* first we call set_params for the platform driver
	174	* this should configure the soc side
	175	* if the machine has compressed ops then we call that as well
	176	* expectation is that platform and machine will configure everything
	177	* for this compress path, like configuring pcm port for codec
	178	*/
	179	if (platform->driver->compr_ops && platform->driver->compr_ops->set_params) {
	180	ret = platform->driver->compr_ops->set_params(cstream, params);
	181	if (ret < 0)
15e2e619	182	goto out;
1245b700 NK	183	}
	184
	185	if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->set_params) {
	186	ret = rtd->dai_link->compr_ops->set_params(cstream);
	187	if (ret < 0)
15e2e619	188	goto out;
1245b700 NK	189	}
	190
	191	snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
	192	SND_SOC_DAPM_STREAM_START);
	193
15e2e619 CK	194	out:
15e2e619 CK	195	mutex_unlock(&rtd->pcm_mutex);
1245b700 NK	196	return ret;
	197	}
	198
	199	static int soc_compr_get_params(struct snd_compr_stream *cstream,
	200	struct snd_codec *params)
	201	{
	202	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	203	struct snd_soc_platform *platform = rtd->platform;
	204	int ret = 0;
	205
15e2e619 CK	206	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
15e2e619 CK	207
1245b700 NK	208	if (platform->driver->compr_ops && platform->driver->compr_ops->get_params)
	209	ret = platform->driver->compr_ops->get_params(cstream, params);
	210
15e2e619	211	mutex_unlock(&rtd->pcm_mutex);
1245b700 NK	212	return ret;
	213	}
	214
	215	static int soc_compr_get_caps(struct snd_compr_stream *cstream,
	216	struct snd_compr_caps *caps)
	217	{
	218	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	219	struct snd_soc_platform *platform = rtd->platform;
	220	int ret = 0;
	221
15e2e619 CK	222	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
15e2e619 CK	223
1245b700 NK	224	if (platform->driver->compr_ops && platform->driver->compr_ops->get_caps)
	225	ret = platform->driver->compr_ops->get_caps(cstream, caps);
	226
15e2e619	227	mutex_unlock(&rtd->pcm_mutex);
1245b700 NK	228	return ret;
	229	}
	230
	231	static int soc_compr_get_codec_caps(struct snd_compr_stream *cstream,
	232	struct snd_compr_codec_caps *codec)
	233	{
	234	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	235	struct snd_soc_platform *platform = rtd->platform;
	236	int ret = 0;
	237
15e2e619 CK	238	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
15e2e619 CK	239
1245b700 NK	240	if (platform->driver->compr_ops && platform->driver->compr_ops->get_codec_caps)
	241	ret = platform->driver->compr_ops->get_codec_caps(cstream, codec);
	242
15e2e619	243	mutex_unlock(&rtd->pcm_mutex);
1245b700 NK	244	return ret;
	245	}
	246
	247	static int soc_compr_ack(struct snd_compr_stream *cstream, size_t bytes)
	248	{
	249	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	250	struct snd_soc_platform *platform = rtd->platform;
	251	int ret = 0;
	252
15e2e619 CK	253	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
15e2e619 CK	254
1245b700 NK	255	if (platform->driver->compr_ops && platform->driver->compr_ops->ack)
	256	ret = platform->driver->compr_ops->ack(cstream, bytes);
	257
15e2e619	258	mutex_unlock(&rtd->pcm_mutex);
1245b700 NK	259	return ret;
	260	}
	261
	262	static int soc_compr_pointer(struct snd_compr_stream *cstream,
	263	struct snd_compr_tstamp *tstamp)
	264	{
	265	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	266	struct snd_soc_platform *platform = rtd->platform;
	267
15e2e619 CK	268	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
15e2e619 CK	269
1245b700 NK	270	if (platform->driver->compr_ops && platform->driver->compr_ops->pointer)
	271	platform->driver->compr_ops->pointer(cstream, tstamp);
	272
15e2e619	273	mutex_unlock(&rtd->pcm_mutex);
1245b700 NK	274	return 0;
	275	}
	276
	277	/* ASoC Compress operations */
	278	static struct snd_compr_ops soc_compr_ops = {
	279	.open = soc_compr_open,
	280	.free = soc_compr_free,
	281	.set_params = soc_compr_set_params,
	282	.get_params = soc_compr_get_params,
	283	.trigger = soc_compr_trigger,
	284	.pointer = soc_compr_pointer,
	285	.ack = soc_compr_ack,
	286	.get_caps = soc_compr_get_caps,
	287	.get_codec_caps = soc_compr_get_codec_caps
	288	};
	289
	290	/* create a new compress */
	291	int soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
	292	{
	293	struct snd_soc_codec *codec = rtd->codec;
	294	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	295	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	296	struct snd_compr *compr;
	297	char new_name[64];
	298	int ret = 0, direction = 0;
	299
	300	/* check client and interface hw capabilities */
	301	snprintf(new_name, sizeof(new_name), "%s %s-%d",
	302	rtd->dai_link->stream_name, codec_dai->name, num);
	303	direction = SND_COMPRESS_PLAYBACK;
	304	compr = kzalloc(sizeof(*compr), GFP_KERNEL);
	305	if (compr == NULL) {
	306	snd_printk(KERN_ERR "Cannot allocate compr\n");
	307	return -ENOMEM;
	308	}
	309
	310	compr->ops = &soc_compr_ops;
	311	mutex_init(&compr->lock);
	312	ret = snd_compress_new(rtd->card->snd_card, num, direction, compr);
	313	if (ret < 0) {
	314	pr_err("compress asoc: can't create compress for codec %s\n",
	315	codec->name);
	316	kfree(compr);
	317	return ret;
	318	}
	319
	320	rtd->compr = compr;
	321	compr->private_data = rtd;
	322
	323	printk(KERN_INFO "compress asoc: %s <-> %s mapping ok\n", codec_dai->name,
	324	cpu_dai->name);
	325	return ret;
	326	}