// SPDX-License-Identifier: GPL-2.0+
  //
  // 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>

  
  #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>

  #include <sound/soc-dpcm.h>

  #include <sound/soc-link.h>

  #include <linux/pm_runtime.h>

  static int soc_compr_components_open(struct snd_compr_stream *cstream,
  				     struct snd_soc_component **last)

  {
  	struct snd_soc_pcm_runtime *rtd = cstream->private_data;

  	struct snd_soc_component *component;

  	int i, ret;

  	for_each_rtd_components(rtd, i, component) {

  		if (!component->driver->compress_ops ||
  		    !component->driver->compress_ops->open)
  			continue;
  
  		ret = component->driver->compress_ops->open(component, cstream);
  		if (ret < 0) {
  			dev_err(component->dev,
  				"Compress ASoC: can't open platform %s: %d
  ",
  				component->name, ret);
  
  			*last = component;
  			return ret;
  		}
  	}

  	*last = NULL;
  	return 0;
  }
  
  static int soc_compr_components_free(struct snd_compr_stream *cstream,
  				     struct snd_soc_component *last)
  {
  	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
  	struct snd_soc_component *component;

  	int i;

  	for_each_rtd_components(rtd, i, component) {

  		if (component == last)
  			break;

  		if (!component->driver->compress_ops ||
  		    !component->driver->compress_ops->free)
  			continue;
  
  		component->driver->compress_ops->free(component, cstream);
  	}

  	return 0;
  }
  
  static int soc_compr_open(struct snd_compr_stream *cstream)
  {
  	struct snd_soc_pcm_runtime *rtd = cstream->private_data;

  	struct snd_soc_component *component = NULL;

  	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);

  	int ret;

  	ret = snd_soc_pcm_component_pm_runtime_get(rtd, cstream);
  	if (ret < 0)
  		goto pm_err;

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

  	ret = snd_soc_dai_compr_startup(cpu_dai, cstream);
  	if (ret < 0)
  		goto out;

  
  	ret = soc_compr_components_open(cstream, &component);
  	if (ret < 0)
  		goto machine_err;

  	ret = snd_soc_link_compr_startup(cstream);
  	if (ret < 0)
  		goto machine_err;

  	snd_soc_runtime_activate(rtd, cstream->direction);

  	mutex_unlock(&rtd->card->pcm_mutex);

  	return 0;
  
  machine_err:

  	soc_compr_components_free(cstream, component);

  	snd_soc_dai_compr_shutdown(cpu_dai, cstream);

  out:

  	mutex_unlock(&rtd->card->pcm_mutex);

  pm_err:

  	snd_soc_pcm_component_pm_runtime_put(rtd, cstream, 1);

  	return ret;
  }

  static int soc_compr_open_fe(struct snd_compr_stream *cstream)
  {
  	struct snd_soc_pcm_runtime *fe = cstream->private_data;

  	struct snd_pcm_substream *fe_substream =
  		 fe->pcm->streams[cstream->direction].substream;

  	struct snd_soc_component *component;

  	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);

  	struct snd_soc_dpcm *dpcm;
  	struct snd_soc_dapm_widget_list *list;
  	int stream;

  	int ret;

  
  	if (cstream->direction == SND_COMPRESS_PLAYBACK)
  		stream = SNDRV_PCM_STREAM_PLAYBACK;
  	else
  		stream = SNDRV_PCM_STREAM_CAPTURE;
  
  	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);

  	fe->dpcm[stream].runtime = fe_substream->runtime;
  
  	ret = dpcm_path_get(fe, stream, &list);
  	if (ret < 0)
  		goto be_err;
  	else if (ret == 0)
  		dev_dbg(fe->dev, "Compress ASoC: %s no valid %s route
  ",
  			fe->dai_link->name, stream ? "capture" : "playback");
  	/* calculate valid and active FE <-> BE dpcms */
  	dpcm_process_paths(fe, stream, &list, 1);
  	fe->dpcm[stream].runtime = fe_substream->runtime;
  
  	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
  
  	ret = dpcm_be_dai_startup(fe, stream);
  	if (ret < 0) {
  		/* clean up all links */

  		for_each_dpcm_be(fe, stream, dpcm)

  			dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
  
  		dpcm_be_disconnect(fe, stream);
  		fe->dpcm[stream].runtime = NULL;
  		goto out;
  	}

  	ret = snd_soc_dai_compr_startup(cpu_dai, cstream);
  	if (ret < 0)
  		goto out;

  	ret = soc_compr_components_open(cstream, &component);
  	if (ret < 0)

  		goto open_err;

  	ret = snd_soc_link_compr_startup(cstream);
  	if (ret < 0)
  		goto machine_err;

  	dpcm_clear_pending_state(fe, stream);
  	dpcm_path_put(&list);
  
  	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
  	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;

  	snd_soc_runtime_activate(fe, stream);

  
  	mutex_unlock(&fe->card->mutex);
  
  	return 0;

  machine_err:

  	soc_compr_components_free(cstream, component);

  open_err:

  	snd_soc_dai_compr_shutdown(cpu_dai, cstream);

  out:

  	dpcm_path_put(&list);
  be_err:

  	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
  	mutex_unlock(&fe->card->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_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
  	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);

  	int stream;

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

  	if (cstream->direction == SND_COMPRESS_PLAYBACK)
  		stream = SNDRV_PCM_STREAM_PLAYBACK;
  	else
  		stream = SNDRV_PCM_STREAM_CAPTURE;

  	snd_soc_runtime_deactivate(rtd, stream);

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

  	if (!snd_soc_dai_active(cpu_dai))

  		cpu_dai->rate = 0;

  	if (!snd_soc_dai_active(codec_dai))

  		codec_dai->rate = 0;

  	snd_soc_link_compr_shutdown(cstream);

  	soc_compr_components_free(cstream, NULL);

  	snd_soc_dai_compr_shutdown(cpu_dai, cstream);

  	snd_soc_dapm_stream_stop(rtd, stream);

  	mutex_unlock(&rtd->card->pcm_mutex);

  	snd_soc_pcm_component_pm_runtime_put(rtd, cstream, 0);

  	return 0;
  }

  static int soc_compr_free_fe(struct snd_compr_stream *cstream)
  {
  	struct snd_soc_pcm_runtime *fe = cstream->private_data;

  	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);

  	struct snd_soc_dpcm *dpcm;
  	int stream, ret;
  
  	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);

  	if (cstream->direction == SND_COMPRESS_PLAYBACK)

  		stream = SNDRV_PCM_STREAM_PLAYBACK;

  	else

  		stream = SNDRV_PCM_STREAM_CAPTURE;

  	snd_soc_runtime_deactivate(fe, stream);

  
  	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
  
  	ret = dpcm_be_dai_hw_free(fe, stream);
  	if (ret < 0)

  		dev_err(fe->dev, "Compressed ASoC: hw_free failed: %d
  ", ret);

  
  	ret = dpcm_be_dai_shutdown(fe, stream);
  
  	/* mark FE's links ready to prune */

  	for_each_dpcm_be(fe, stream, dpcm)

  		dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;

  	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);

  
  	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
  	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
  
  	dpcm_be_disconnect(fe, stream);
  
  	fe->dpcm[stream].runtime = NULL;

  	snd_soc_link_compr_shutdown(cstream);

  	soc_compr_components_free(cstream, NULL);

  	snd_soc_dai_compr_shutdown(cpu_dai, cstream);

  	mutex_unlock(&fe->card->mutex);
  	return 0;
  }

  static int soc_compr_components_trigger(struct snd_compr_stream *cstream,
  					int cmd)

  {

  	struct snd_soc_pcm_runtime *rtd = cstream->private_data;

  	struct snd_soc_component *component;

  	int i, ret;

  	for_each_rtd_components(rtd, i, component) {

  		if (!component->driver->compress_ops ||
  		    !component->driver->compress_ops->trigger)
  			continue;
  
  		ret = component->driver->compress_ops->trigger(
  			component, cstream, cmd);
  		if (ret < 0)
  			return ret;
  	}

  	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_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
  	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);

  	int ret;

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

  
  	ret = soc_compr_components_trigger(cstream, cmd);
  	if (ret < 0)
  		goto out;

  	ret = snd_soc_dai_compr_trigger(cpu_dai, 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->card->pcm_mutex);

  	return ret;
  }

  static int soc_compr_trigger_fe(struct snd_compr_stream *cstream, int cmd)
  {
  	struct snd_soc_pcm_runtime *fe = cstream->private_data;

  	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);

  	int ret, stream;

  
  	if (cmd == SND_COMPR_TRIGGER_PARTIAL_DRAIN ||

  	    cmd == SND_COMPR_TRIGGER_DRAIN)
  		return soc_compr_components_trigger(cstream, cmd);

  
  	if (cstream->direction == SND_COMPRESS_PLAYBACK)
  		stream = SNDRV_PCM_STREAM_PLAYBACK;
  	else
  		stream = SNDRV_PCM_STREAM_CAPTURE;

  	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);

  	ret = snd_soc_dai_compr_trigger(cpu_dai, cstream, cmd);
  	if (ret < 0)
  		goto out;

  	ret = soc_compr_components_trigger(cstream, cmd);
  	if (ret < 0)
  		goto out;

  	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
  
  	ret = dpcm_be_dai_trigger(fe, stream, cmd);
  
  	switch (cmd) {
  	case SNDRV_PCM_TRIGGER_START:
  	case SNDRV_PCM_TRIGGER_RESUME:
  	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
  		break;
  	case SNDRV_PCM_TRIGGER_STOP:
  	case SNDRV_PCM_TRIGGER_SUSPEND:
  		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
  		break;
  	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
  		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
  		break;
  	}
  
  out:
  	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
  	mutex_unlock(&fe->card->mutex);
  	return ret;
  }

  static int soc_compr_components_set_params(struct snd_compr_stream *cstream,
  					   struct snd_compr_params *params)

  {
  	struct snd_soc_pcm_runtime *rtd = cstream->private_data;

  	struct snd_soc_component *component;

  	int i, ret;

  	for_each_rtd_components(rtd, i, component) {

  		if (!component->driver->compress_ops ||
  		    !component->driver->compress_ops->set_params)
  			continue;
  
  		ret = component->driver->compress_ops->set_params(
  			component, cstream, params);
  		if (ret < 0)
  			return ret;
  	}

  	return 0;
  }
  
  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_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);

  	int ret;

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

  	/*
  	 * First we call set_params for the CPU DAI, then the component
  	 * driver this should configure the SoC side. If the machine has
  	 * compressed ops then we call that as well. The expectation is
  	 * that these callbacks will configure everything for this compress
  	 * path, like configuring a PCM port for a CODEC.

  	 */

  	ret = snd_soc_dai_compr_set_params(cpu_dai, cstream, params);
  	if (ret < 0)
  		goto err;

  	ret = soc_compr_components_set_params(cstream, params);
  	if (ret < 0)
  		goto err;

  	ret = snd_soc_link_compr_set_params(cstream);
  	if (ret < 0)
  		goto err;

  	if (cstream->direction == SND_COMPRESS_PLAYBACK)
  		snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,

  					  SND_SOC_DAPM_STREAM_START);

  	else
  		snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,

  					  SND_SOC_DAPM_STREAM_START);

  	/* cancel any delayed stream shutdown that is pending */
  	rtd->pop_wait = 0;

  	mutex_unlock(&rtd->card->pcm_mutex);

  
  	cancel_delayed_work_sync(&rtd->delayed_work);

  	return 0;

  
  err:

  	mutex_unlock(&rtd->card->pcm_mutex);

  	return ret;
  }

  static int soc_compr_set_params_fe(struct snd_compr_stream *cstream,

  				   struct snd_compr_params *params)

  {
  	struct snd_soc_pcm_runtime *fe = cstream->private_data;

  	struct snd_pcm_substream *fe_substream =
  		 fe->pcm->streams[cstream->direction].substream;

  	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);

  	int ret, stream;

  
  	if (cstream->direction == SND_COMPRESS_PLAYBACK)
  		stream = SNDRV_PCM_STREAM_PLAYBACK;
  	else
  		stream = SNDRV_PCM_STREAM_CAPTURE;
  
  	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);

  	/*
  	 * Create an empty hw_params for the BE as the machine driver must
  	 * fix this up to match DSP decoder and ASRC configuration.
  	 * I.e. machine driver fixup for compressed BE is mandatory.
  	 */
  	memset(&fe->dpcm[fe_substream->stream].hw_params, 0,
  		sizeof(struct snd_pcm_hw_params));
  
  	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
  
  	ret = dpcm_be_dai_hw_params(fe, stream);
  	if (ret < 0)
  		goto out;
  
  	ret = dpcm_be_dai_prepare(fe, stream);
  	if (ret < 0)
  		goto out;

  	ret = snd_soc_dai_compr_set_params(cpu_dai, cstream, params);
  	if (ret < 0)
  		goto out;

  	ret = soc_compr_components_set_params(cstream, params);
  	if (ret < 0)
  		goto out;

  	ret = snd_soc_link_compr_set_params(cstream);
  	if (ret < 0)
  		goto out;

  	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);

  	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
  
  out:
  	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
  	mutex_unlock(&fe->card->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_component *component;

  	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);

  	int i, ret = 0;

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

  	ret = snd_soc_dai_compr_get_params(cpu_dai, cstream, params);
  	if (ret < 0)
  		goto err;

  	for_each_rtd_components(rtd, i, component) {

  		if (!component->driver->compress_ops ||
  		    !component->driver->compress_ops->get_params)
  			continue;
  
  		ret = component->driver->compress_ops->get_params(
  			component, cstream, params);
  		break;
  	}

  err:

  	mutex_unlock(&rtd->card->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_component *component;

  	int i, ret = 0;

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

  	for_each_rtd_components(rtd, i, component) {

  		if (!component->driver->compress_ops ||
  		    !component->driver->compress_ops->get_caps)
  			continue;
  
  		ret = component->driver->compress_ops->get_caps(
  			component, cstream, caps);
  		break;
  	}

  	mutex_unlock(&rtd->card->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_component *component;

  	int i, ret = 0;

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

  	for_each_rtd_components(rtd, i, component) {

  		if (!component->driver->compress_ops ||
  		    !component->driver->compress_ops->get_codec_caps)
  			continue;
  
  		ret = component->driver->compress_ops->get_codec_caps(
  			component, cstream, codec);
  		break;
  	}

  	mutex_unlock(&rtd->card->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_component *component;

  	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);

  	int i, ret = 0;

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

  	ret = snd_soc_dai_compr_ack(cpu_dai, cstream, bytes);
  	if (ret < 0)
  		goto err;

  	for_each_rtd_components(rtd, i, component) {

  		if (!component->driver->compress_ops ||
  		    !component->driver->compress_ops->ack)
  			continue;
  
  		ret = component->driver->compress_ops->ack(
  			component, cstream, bytes);
  		if (ret < 0)
  			goto err;
  	}

  err:

  	mutex_unlock(&rtd->card->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_component *component;

  	int i, ret = 0;

  	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);

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

  	ret = snd_soc_dai_compr_pointer(cpu_dai, cstream, tstamp);
  	if (ret < 0)
  		goto out;

  	for_each_rtd_components(rtd, i, component) {

  		if (!component->driver->compress_ops ||
  		    !component->driver->compress_ops->pointer)
  			continue;
  
  		ret = component->driver->compress_ops->pointer(
  			component, cstream, tstamp);
  		break;
  	}

  out:

  	mutex_unlock(&rtd->card->pcm_mutex);

  	return ret;

  }

  static int soc_compr_copy(struct snd_compr_stream *cstream,

  			  char __user *buf, size_t count)

  {
  	struct snd_soc_pcm_runtime *rtd = cstream->private_data;

  	struct snd_soc_component *component;

  	int i, ret = 0;

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

  	for_each_rtd_components(rtd, i, component) {

  		if (!component->driver->compress_ops ||
  		    !component->driver->compress_ops->copy)
  			continue;
  
  		ret = component->driver->compress_ops->copy(
  			component, cstream, buf, count);
  		break;
  	}

  	mutex_unlock(&rtd->card->pcm_mutex);

  	return ret;
  }

  static int soc_compr_set_metadata(struct snd_compr_stream *cstream,

  				  struct snd_compr_metadata *metadata)

  {
  	struct snd_soc_pcm_runtime *rtd = cstream->private_data;

  	struct snd_soc_component *component;

  	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);

  	int i, ret;

  	ret = snd_soc_dai_compr_set_metadata(cpu_dai, cstream, metadata);
  	if (ret < 0)
  		return ret;

  	for_each_rtd_components(rtd, i, component) {

  		if (!component->driver->compress_ops ||
  		    !component->driver->compress_ops->set_metadata)
  			continue;
  
  		ret = component->driver->compress_ops->set_metadata(
  			component, cstream, metadata);
  		if (ret < 0)
  			return ret;
  	}

  	return 0;

  }

  static int soc_compr_get_metadata(struct snd_compr_stream *cstream,

  				  struct snd_compr_metadata *metadata)

  {
  	struct snd_soc_pcm_runtime *rtd = cstream->private_data;

  	struct snd_soc_component *component;

  	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);

  	int i, ret;

  	ret = snd_soc_dai_compr_get_metadata(cpu_dai, cstream, metadata);
  	if (ret < 0)
  		return ret;

  	for_each_rtd_components(rtd, i, component) {

  		if (!component->driver->compress_ops ||
  		    !component->driver->compress_ops->get_metadata)
  			continue;
  
  		return component->driver->compress_ops->get_metadata(
  			component, cstream, metadata);
  	}

  	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,

  	.set_metadata   = soc_compr_set_metadata,
  	.get_metadata	= soc_compr_get_metadata,

  	.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
  };

  /* ASoC Dynamic Compress operations */
  static struct snd_compr_ops soc_compr_dyn_ops = {
  	.open		= soc_compr_open_fe,
  	.free		= soc_compr_free_fe,
  	.set_params	= soc_compr_set_params_fe,
  	.get_params	= soc_compr_get_params,
  	.set_metadata   = soc_compr_set_metadata,
  	.get_metadata	= soc_compr_get_metadata,
  	.trigger	= soc_compr_trigger_fe,
  	.pointer	= soc_compr_pointer,
  	.ack		= soc_compr_ack,
  	.get_caps	= soc_compr_get_caps,
  	.get_codec_caps = soc_compr_get_codec_caps
  };

  /**
   * snd_soc_new_compress - create a new compress.
   *
   * @rtd: The runtime for which we will create compress
   * @num: the device index number (zero based - shared with normal PCMs)
   *
   * Return: 0 for success, else error.
   */
  int snd_soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)

  {

  	struct snd_soc_component *component;

  	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
  	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);

  	struct snd_compr *compr;

  	struct snd_pcm *be_pcm;

  	char new_name[64];
  	int ret = 0, direction = 0;

  	int playback = 0, capture = 0;

  	int i;

  	if (rtd->num_cpus > 1 ||
  	    rtd->num_codecs > 1) {

  		dev_err(rtd->card->dev,

  			"Compress ASoC: Multi CPU/Codec not supported
  ");

  		return -EINVAL;
  	}

  	/* check client and interface hw capabilities */

  	if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
  	    snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_PLAYBACK))

  		playback = 1;

  	if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
  	    snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_CAPTURE))

  		capture = 1;

  	/*
  	 * Compress devices are unidirectional so only one of the directions
  	 * should be set, check for that (xor)
  	 */
  	if (playback + capture != 1) {

  		dev_err(rtd->card->dev,
  			"Compress ASoC: Invalid direction for P %d, C %d
  ",
  			playback, capture);

  		return -EINVAL;
  	}

  	if (playback)

  		direction = SND_COMPRESS_PLAYBACK;

  	else

  		direction = SND_COMPRESS_CAPTURE;

  	compr = devm_kzalloc(rtd->card->dev, sizeof(*compr), GFP_KERNEL);

  	if (!compr)

  		return -ENOMEM;

  	compr->ops = devm_kzalloc(rtd->card->dev, sizeof(soc_compr_ops),
  				  GFP_KERNEL);

  	if (!compr->ops)
  		return -ENOMEM;

  
  	if (rtd->dai_link->dynamic) {
  		snprintf(new_name, sizeof(new_name), "(%s)",
  			rtd->dai_link->stream_name);
  
  		ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,

  				rtd->dai_link->dpcm_playback,
  				rtd->dai_link->dpcm_capture, &be_pcm);

  		if (ret < 0) {

  			dev_err(rtd->card->dev,
  				"Compress ASoC: can't create compressed for %s: %d
  ",
  				rtd->dai_link->name, ret);

  			return ret;

  		}
  
  		rtd->pcm = be_pcm;
  		rtd->fe_compr = 1;

  		if (rtd->dai_link->dpcm_playback)
  			be_pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
  		else if (rtd->dai_link->dpcm_capture)
  			be_pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;

  		memcpy(compr->ops, &soc_compr_dyn_ops, sizeof(soc_compr_dyn_ops));

  	} else {
  		snprintf(new_name, sizeof(new_name), "%s %s-%d",
  			rtd->dai_link->stream_name, codec_dai->name, num);

  		memcpy(compr->ops, &soc_compr_ops, sizeof(soc_compr_ops));

  	}

  	for_each_rtd_components(rtd, i, component) {

  		if (!component->driver->compress_ops ||
  		    !component->driver->compress_ops->copy)
  			continue;
  
  		compr->ops->copy = soc_compr_copy;
  		break;
  	}

  	mutex_init(&compr->lock);

  	ret = snd_compress_new(rtd->card->snd_card, num, direction,
  				new_name, compr);

  	if (ret < 0) {

  		component = asoc_rtd_to_codec(rtd, 0)->component;

  		dev_err(component->dev,
  			"Compress ASoC: can't create compress for codec %s: %d
  ",
  			component->name, ret);

  		return ret;

  	}

  	/* DAPM dai link stream work */

  	rtd->close_delayed_work_func = snd_soc_close_delayed_work;

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

  	dev_dbg(rtd->card->dev, "Compress ASoC: %s <-> %s mapping ok
  ",
  		codec_dai->name, cpu_dai->name);

  	return 0;

  }

  EXPORT_SYMBOL_GPL(snd_soc_new_compress);