text: // SPDX-License-Identifier: GPL-2.0+
  //
  // soc-core.c  --  ALSA SoC Audio Layer
  //
  // Copyright 2005 Wolfson Microelectronics PLC.
  // Copyright 2005 Openedhand Ltd.
  // Copyright (C) 2010 Slimlogic Ltd.
  // Copyright (C) 2010 Texas Instruments Inc.
  //
  // Author: Liam Girdwood <lrg@slimlogic.co.uk>
  //         with code, comments and ideas from :-
  //         Richard Purdie <richard@openedhand.com>
  //
  //  TODO:
  //   o Add hw rules to enforce rates, etc.
  //   o More testing with other codecs/machines.
  //   o Add more codecs and platforms to ensure good API coverage.
  //   o Support TDM on PCM and I2S
  
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  #include <linux/init.h>
  #include <linux/delay.h>
  #include <linux/pm.h>
  #include <linux/bitops.h>
  #include <linux/debugfs.h>
  #include <linux/platform_device.h>
  #include <linux/pinctrl/consumer.h>
  #include <linux/ctype.h>
  #include <linux/slab.h>
  #include <linux/of.h>
  #include <linux/of_graph.h>
  #include <linux/dmi.h>
  #include <sound/core.h>
  #include <sound/jack.h>
  #include <sound/pcm.h>
  #include <sound/pcm_params.h>
  #include <sound/soc.h>
  #include <sound/soc-dpcm.h>
  #include <sound/soc-topology.h>
  #include <sound/initval.h>
  
  #define CREATE_TRACE_POINTS
  #include <trace/events/asoc.h>
  
  #define NAME_SIZE	32
  
  #ifdef CONFIG_DEBUG_FS
  struct dentry *snd_soc_debugfs_root;
  EXPORT_SYMBOL_GPL(snd_soc_debugfs_root);
  #endif
  
  static DEFINE_MUTEX(client_mutex);
  static LIST_HEAD(component_list);
  static LIST_HEAD(unbind_card_list);
  
  #define for_each_component(component)			\
  	list_for_each_entry(component, &component_list, list)
  
  /*
   * This is used if driver don't need to have CPU/Codec/Platform
   * dai_link. see soc.h
   */
  struct snd_soc_dai_link_component null_dailink_component[0];
  EXPORT_SYMBOL_GPL(null_dailink_component);
  
  /*
   * This is a timeout to do a DAPM powerdown after a stream is closed().
   * It can be used to eliminate pops between different playback streams, e.g.
   * between two audio tracks.
   */
  static int pmdown_time = 5000;
  module_param(pmdown_time, int, 0);
  MODULE_PARM_DESC(pmdown_time, "DAPM stream powerdown time (msecs)");
  
  /*
   * If a DMI filed contain strings in this blacklist (e.g.
   * "Type2 - Board Manufacturer" or "Type1 - TBD by OEM"), it will be taken
   * as invalid and dropped when setting the card long name from DMI info.
   */
  static const char * const dmi_blacklist[] = {
  	"To be filled by OEM",
  	"TBD by OEM",
  	"Default String",
  	"Board Manufacturer",
  	"Board Vendor Name",
  	"Board Product Name",
  	NULL,	/* terminator */
  };
  
  static ssize_t pmdown_time_show(struct device *dev,
  				struct device_attribute *attr, char *buf)
  {
  	struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
  
  	return sprintf(buf, "%ld\n", rtd->pmdown_time);
  }
  
  static ssize_t pmdown_time_set(struct device *dev,
  			       struct device_attribute *attr,
  			       const char *buf, size_t count)
  {
  	struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
  	int ret;
  
  	ret = kstrtol(buf, 10, &rtd->pmdown_time);
  	if (ret)
  		return ret;
  
  	return count;
  }
  
  static DEVICE_ATTR(pmdown_time, 0644, pmdown_time_show, pmdown_time_set);
  
  static struct attribute *soc_dev_attrs[] = {
  	&dev_attr_pmdown_time.attr,
  	NULL
  };
  
  static umode_t soc_dev_attr_is_visible(struct kobject *kobj,
  				       struct attribute *attr, int idx)
  {
  	struct device *dev = kobj_to_dev(kobj);
  	struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
  
  	if (attr == &dev_attr_pmdown_time.attr)
  		return attr->mode; /* always visible */
  	return rtd->num_codecs ? attr->mode : 0; /* enabled only with codec */
  }
  
  static const struct attribute_group soc_dapm_dev_group = {
  	.attrs = soc_dapm_dev_attrs,
  	.is_visible = soc_dev_attr_is_visible,
  };
  
  static const struct attribute_group soc_dev_group = {
  	.attrs = soc_dev_attrs,
  	.is_visible = soc_dev_attr_is_visible,
  };
  
  static const struct attribute_group *soc_dev_attr_groups[] = {
  	&soc_dapm_dev_group,
  	&soc_dev_group,
  	NULL
  };
  
  #ifdef CONFIG_DEBUG_FS
  static void soc_init_component_debugfs(struct snd_soc_component *component)
  {
  	if (!component->card->debugfs_card_root)
  		return;
  
  	if (component->debugfs_prefix) {
  		char *name;
  
  		name = kasprintf(GFP_KERNEL, "%s:%s",
  			component->debugfs_prefix, component->name);
  		if (name) {
  			component->debugfs_root = debugfs_create_dir(name,
  				component->card->debugfs_card_root);
  			kfree(name);
  		}
  	} else {
  		component->debugfs_root = debugfs_create_dir(component->name,
  				component->card->debugfs_card_root);
  	}
  
  	if (IS_ERR(component->debugfs_root)) {
  		dev_warn(component->dev,
  			"ASoC: Failed to create component debugfs directory: %ld\n",
  			PTR_ERR(component->debugfs_root));
  		return;
  	}
  
  	snd_soc_dapm_debugfs_init(snd_soc_component_get_dapm(component),
  		component->debugfs_root);
  }
  
  static void soc_cleanup_component_debugfs(struct snd_soc_component *component)
  {
  	debugfs_remove_recursive(component->debugfs_root);
  }
  
  static int dai_list_show(struct seq_file *m, void *v)
  {
  	struct snd_soc_component *component;
  	struct snd_soc_dai *dai;
  
  	mutex_lock(&client_mutex);
  
  	for_each_component(component)
  		for_each_component_dais(component, dai)
  			seq_printf(m, "%s\n", dai->name);
  
  	mutex_unlock(&client_mutex);
  
  	return 0;
  }
  DEFINE_SHOW_ATTRIBUTE(dai_list);
  
  static int component_list_show(struct seq_file *m, void *v)
  {
  	struct snd_soc_component *component;
  
  	mutex_lock(&client_mutex);
  
  	for_each_component(component)
  		seq_printf(m, "%s\n", component->name);
  
  	mutex_unlock(&client_mutex);
  
  	return 0;
  }
  DEFINE_SHOW_ATTRIBUTE(component_list);
  
  static void soc_init_card_debugfs(struct snd_soc_card *card)
  {
  	if (!snd_soc_debugfs_root)
  		return;
  
  	card->debugfs_card_root = debugfs_create_dir(card->name,
  						     snd_soc_debugfs_root);
  	if (IS_ERR(card->debugfs_card_root)) {
  		dev_warn(card->dev,
  			 "ASoC: Failed to create card debugfs directory: %ld\n",
  			 PTR_ERR(card->debugfs_card_root));
  		card->debugfs_card_root = NULL;
  		return;
  	}
  
  	card->debugfs_pop_time = debugfs_create_u32("dapm_pop_time", 0644,
  						    card->debugfs_card_root,
  						    &card->pop_time);
  	if (IS_ERR(card->debugfs_pop_time))
  		dev_warn(card->dev,
  			 "ASoC: Failed to create pop time debugfs file: %ld\n",
  			 PTR_ERR(card->debugfs_pop_time));
  }
  
  static void soc_cleanup_card_debugfs(struct snd_soc_card *card)
  {
  	if (!card->debugfs_card_root)
  		return;
  	debugfs_remove_recursive(card->debugfs_card_root);
  	card->debugfs_card_root = NULL;
  }
  
  static void snd_soc_debugfs_init(void)
  {
  	snd_soc_debugfs_root = debugfs_create_dir("asoc", NULL);
  	if (IS_ERR_OR_NULL(snd_soc_debugfs_root)) {
  		pr_warn("ASoC: Failed to create debugfs directory\n");
  		snd_soc_debugfs_root = NULL;
  		return;
  	}
  
  	if (!debugfs_create_file("dais", 0444, snd_soc_debugfs_root, NULL,
  				 &dai_list_fops))
  		pr_warn("ASoC: Failed to create DAI list debugfs file\n");
  
  	if (!debugfs_create_file("components", 0444, snd_soc_debugfs_root, NULL,
  				 &component_list_fops))
  		pr_warn("ASoC: Failed to create component list debugfs file\n");
  }
  
  static void snd_soc_debugfs_exit(void)
  {
  	debugfs_remove_recursive(snd_soc_debugfs_root);
  }
  
  #else
  
  static inline void soc_init_component_debugfs(
  	struct snd_soc_component *component)
  {
  }
  
  static inline void soc_cleanup_component_debugfs(
  	struct snd_soc_component *component)
  {
  }
  
  static inline void soc_init_card_debugfs(struct snd_soc_card *card)
  {
  }
  
  static inline void soc_cleanup_card_debugfs(struct snd_soc_card *card)
  {
  }
  
  static inline void snd_soc_debugfs_init(void)
  {
  }
  
  static inline void snd_soc_debugfs_exit(void)
  {
  }
  
  #endif
  
  static int snd_soc_rtdcom_add(struct snd_soc_pcm_runtime *rtd,
  			      struct snd_soc_component *component)
  {
  	struct snd_soc_rtdcom_list *rtdcom;
  	struct snd_soc_rtdcom_list *new_rtdcom;
  
  	for_each_rtdcom(rtd, rtdcom) {
  		/* already connected */
  		if (rtdcom->component == component)
  			return 0;
  	}
  
  	new_rtdcom = kmalloc(sizeof(*new_rtdcom), GFP_KERNEL);
  	if (!new_rtdcom)
  		return -ENOMEM;
  
  	new_rtdcom->component = component;
  	INIT_LIST_HEAD(&new_rtdcom->list);
  
  	list_add_tail(&new_rtdcom->list, &rtd->component_list);
  
  	return 0;
  }
  
  static void snd_soc_rtdcom_del_all(struct snd_soc_pcm_runtime *rtd)
  {
  	struct snd_soc_rtdcom_list *rtdcom1, *rtdcom2;
  
  	for_each_rtdcom_safe(rtd, rtdcom1, rtdcom2)
  		kfree(rtdcom1);
  
  	INIT_LIST_HEAD(&rtd->component_list);
  }
  
  struct snd_soc_component *snd_soc_rtdcom_lookup(struct snd_soc_pcm_runtime *rtd,
  						const char *driver_name)
  {
  	struct snd_soc_rtdcom_list *rtdcom;
  
  	if (!driver_name)
  		return NULL;
  
  	for_each_rtdcom(rtd, rtdcom) {
  		const char *component_name = rtdcom->component->driver->name;
  
  		if (!component_name)
  			continue;
  
  		if ((component_name == driver_name) ||
  		    strcmp(component_name, driver_name) == 0)
  			return rtdcom->component;
  	}
  
  	return NULL;
  }
  EXPORT_SYMBOL_GPL(snd_soc_rtdcom_lookup);
  
  struct snd_pcm_substream *snd_soc_get_dai_substream(struct snd_soc_card *card,
  		const char *dai_link, int stream)
  {
  	struct snd_soc_pcm_runtime *rtd;
  
  	for_each_card_rtds(card, rtd) {
  		if (rtd->dai_link->no_pcm &&
  			!strcmp(rtd->dai_link->name, dai_link))
  			return rtd->pcm->streams[stream].substream;
  	}
  	dev_dbg(card->dev, "ASoC: failed to find dai link %s\n", dai_link);
  	return NULL;
  }
  EXPORT_SYMBOL_GPL(snd_soc_get_dai_substream);
  
  static const struct snd_soc_ops null_snd_soc_ops;
  
  static struct snd_soc_pcm_runtime *soc_new_pcm_runtime(
  	struct snd_soc_card *card, struct snd_soc_dai_link *dai_link)
  {
  	struct snd_soc_pcm_runtime *rtd;
  
  	rtd = kzalloc(sizeof(struct snd_soc_pcm_runtime), GFP_KERNEL);
  	if (!rtd)
  		return NULL;
  
  	INIT_LIST_HEAD(&rtd->component_list);
  	rtd->card = card;
  	rtd->dai_link = dai_link;
  	if (!rtd->dai_link->ops)
  		rtd->dai_link->ops = &null_snd_soc_ops;
  
  	rtd->codec_dais = kcalloc(dai_link->num_codecs,
  					sizeof(struct snd_soc_dai *),
  					GFP_KERNEL);
  	if (!rtd->codec_dais) {
  		kfree(rtd);
  		return NULL;
  	}
  
  	return rtd;
  }
  
  static void soc_free_pcm_runtime(struct snd_soc_pcm_runtime *rtd)
  {
  	kfree(rtd->codec_dais);
  	snd_soc_rtdcom_del_all(rtd);
  	kfree(rtd);
  }
  
  static void soc_add_pcm_runtime(struct snd_soc_card *card,
  		struct snd_soc_pcm_runtime *rtd)
  {
  	list_add_tail(&rtd->list, &card->rtd_list);
  	rtd->num = card->num_rtd;
  	card->num_rtd++;
  }
  
  static void soc_remove_pcm_runtimes(struct snd_soc_card *card)
  {
  	struct snd_soc_pcm_runtime *rtd, *_rtd;
  
  	for_each_card_rtds_safe(card, rtd, _rtd) {
  		list_del(&rtd->list);
  		soc_free_pcm_runtime(rtd);
  	}
  
  	card->num_rtd = 0;
  }
  
  struct snd_soc_pcm_runtime *snd_soc_get_pcm_runtime(struct snd_soc_card *card,
  		const char *dai_link)
  {
  	struct snd_soc_pcm_runtime *rtd;
  
  	for_each_card_rtds(card, rtd) {
  		if (!strcmp(rtd->dai_link->name, dai_link))
  			return rtd;
  	}
  	dev_dbg(card->dev, "ASoC: failed to find rtd %s\n", dai_link);
  	return NULL;
  }
  EXPORT_SYMBOL_GPL(snd_soc_get_pcm_runtime);
  
  static void snd_soc_flush_all_delayed_work(struct snd_soc_card *card)
  {
  	struct snd_soc_pcm_runtime *rtd;
  
  	for_each_card_rtds(card, rtd)
  		flush_delayed_work(&rtd->delayed_work);
  }
  
  static void codec2codec_close_delayed_work(struct work_struct *work)
  {
  	/*
  	 * Currently nothing to do for c2c links
  	 * Since c2c links are internal nodes in the DAPM graph and
  	 * don't interface with the outside world or application layer
  	 * we don't have to do any special handling on close.
  	 */
  }
  
  #ifdef CONFIG_PM_SLEEP
  /* powers down audio subsystem for suspend */
  int snd_soc_suspend(struct device *dev)
  {
  	struct snd_soc_card *card = dev_get_drvdata(dev);
  	struct snd_soc_component *component;
  	struct snd_soc_pcm_runtime *rtd;
  	int i;
  
  	/* If the card is not initialized yet there is nothing to do */
  	if (!card->instantiated)
  		return 0;
  
  	/*
  	 * Due to the resume being scheduled into a workqueue we could
  	 * suspend before that's finished - wait for it to complete.
  	 */
  	snd_power_wait(card->snd_card, SNDRV_CTL_POWER_D0);
  
  	/* we're going to block userspace touching us until resume completes */
  	snd_power_change_state(card->snd_card, SNDRV_CTL_POWER_D3hot);
  
  	/* mute any active DACs */
  	for_each_card_rtds(card, rtd) {
  		struct snd_soc_dai *dai;
  
  		if (rtd->dai_link->ignore_suspend)
  			continue;
  
  		for_each_rtd_codec_dai(rtd, i, dai) {
  			struct snd_soc_dai_driver *drv = dai->driver;
  
  			if (drv->ops->digital_mute && dai->playback_active)
  				drv->ops->digital_mute(dai, 1);
  		}
  	}
  
  	/* suspend all pcms */
  	for_each_card_rtds(card, rtd) {
  		if (rtd->dai_link->ignore_suspend)
  			continue;
  
  		snd_pcm_suspend_all(rtd->pcm);
  	}
  
  	if (card->suspend_pre)
  		card->suspend_pre(card);
  
  	for_each_card_rtds(card, rtd) {
  		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  
  		if (rtd->dai_link->ignore_suspend)
  			continue;
  
  		if (cpu_dai->driver->suspend && !cpu_dai->driver->bus_control)
  			cpu_dai->driver->suspend(cpu_dai);
  	}
  
  	/* close any waiting streams */
  	snd_soc_flush_all_delayed_work(card);
  
  	for_each_card_rtds(card, rtd) {
  
  		if (rtd->dai_link->ignore_suspend)
  			continue;
  
  		snd_soc_dapm_stream_event(rtd,
  					  SNDRV_PCM_STREAM_PLAYBACK,
  					  SND_SOC_DAPM_STREAM_SUSPEND);
  
  		snd_soc_dapm_stream_event(rtd,
  					  SNDRV_PCM_STREAM_CAPTURE,
  					  SND_SOC_DAPM_STREAM_SUSPEND);
  	}
  
  	/* Recheck all endpoints too, their state is affected by suspend */
  	dapm_mark_endpoints_dirty(card);
  	snd_soc_dapm_sync(&card->dapm);
  
  	/* suspend all COMPONENTs */
  	for_each_card_components(card, component) {
  		struct snd_soc_dapm_context *dapm =
  				snd_soc_component_get_dapm(component);
  
  		/*
  		 * If there are paths active then the COMPONENT will be held
  		 * with bias _ON and should not be suspended.
  		 */
  		if (!component->suspended) {
  			switch (snd_soc_dapm_get_bias_level(dapm)) {
  			case SND_SOC_BIAS_STANDBY:
  				/*
  				 * If the COMPONENT is capable of idle
  				 * bias off then being in STANDBY
  				 * means it's doing something,
  				 * otherwise fall through.
  				 */
  				if (dapm->idle_bias_off) {
  					dev_dbg(component->dev,
  						"ASoC: idle_bias_off CODEC on over suspend\n");
  					break;
  				}
  				/* fall through */
  
  			case SND_SOC_BIAS_OFF:
  				if (component->driver->suspend)
  					component->driver->suspend(component);
  				component->suspended = 1;
  				if (component->regmap)
  					regcache_mark_dirty(component->regmap);
  				/* deactivate pins to sleep state */
  				pinctrl_pm_select_sleep_state(component->dev);
  				break;
  			default:
  				dev_dbg(component->dev,
  					"ASoC: COMPONENT is on over suspend\n");
  				break;
  			}
  		}
  	}
  
  	for_each_card_rtds(card, rtd) {
  		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  
  		if (rtd->dai_link->ignore_suspend)
  			continue;
  
  		if (cpu_dai->driver->suspend && cpu_dai->driver->bus_control)
  			cpu_dai->driver->suspend(cpu_dai);
  
  		/* deactivate pins to sleep state */
  		pinctrl_pm_select_sleep_state(cpu_dai->dev);
  	}
  
  	if (card->suspend_post)
  		card->suspend_post(card);
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_suspend);
  
  /*
   * deferred resume work, so resume can complete before we finished
   * setting our codec back up, which can be very slow on I2C
   */
  static void soc_resume_deferred(struct work_struct *work)
  {
  	struct snd_soc_card *card =
  			container_of(work, struct snd_soc_card,
  				     deferred_resume_work);
  	struct snd_soc_pcm_runtime *rtd;
  	struct snd_soc_component *component;
  	int i;
  
  	/*
  	 * our power state is still SNDRV_CTL_POWER_D3hot from suspend time,
  	 * so userspace apps are blocked from touching us
  	 */
  
  	dev_dbg(card->dev, "ASoC: starting resume work\n");
  
  	/* Bring us up into D2 so that DAPM starts enabling things */
  	snd_power_change_state(card->snd_card, SNDRV_CTL_POWER_D2);
  
  	if (card->resume_pre)
  		card->resume_pre(card);
  
  	/* resume control bus DAIs */
  	for_each_card_rtds(card, rtd) {
  		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  
  		if (rtd->dai_link->ignore_suspend)
  			continue;
  
  		if (cpu_dai->driver->resume && cpu_dai->driver->bus_control)
  			cpu_dai->driver->resume(cpu_dai);
  	}
  
  	for_each_card_components(card, component) {
  		if (component->suspended) {
  			if (component->driver->resume)
  				component->driver->resume(component);
  			component->suspended = 0;
  		}
  	}
  
  	for_each_card_rtds(card, rtd) {
  
  		if (rtd->dai_link->ignore_suspend)
  			continue;
  
  		snd_soc_dapm_stream_event(rtd,
  					  SNDRV_PCM_STREAM_PLAYBACK,
  					  SND_SOC_DAPM_STREAM_RESUME);
  
  		snd_soc_dapm_stream_event(rtd,
  					  SNDRV_PCM_STREAM_CAPTURE,
  					  SND_SOC_DAPM_STREAM_RESUME);
  	}
  
  	/* unmute any active DACs */
  	for_each_card_rtds(card, rtd) {
  		struct snd_soc_dai *dai;
  
  		if (rtd->dai_link->ignore_suspend)
  			continue;
  
  		for_each_rtd_codec_dai(rtd, i, dai) {
  			struct snd_soc_dai_driver *drv = dai->driver;
  
  			if (drv->ops->digital_mute && dai->playback_active)
  				drv->ops->digital_mute(dai, 0);
  		}
  	}
  
  	for_each_card_rtds(card, rtd) {
  		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  
  		if (rtd->dai_link->ignore_suspend)
  			continue;
  
  		if (cpu_dai->driver->resume && !cpu_dai->driver->bus_control)
  			cpu_dai->driver->resume(cpu_dai);
  	}
  
  	if (card->resume_post)
  		card->resume_post(card);
  
  	dev_dbg(card->dev, "ASoC: resume work completed\n");
  
  	/* Recheck all endpoints too, their state is affected by suspend */
  	dapm_mark_endpoints_dirty(card);
  	snd_soc_dapm_sync(&card->dapm);
  
  	/* userspace can access us now we are back as we were before */
  	snd_power_change_state(card->snd_card, SNDRV_CTL_POWER_D0);
  }
  
  /* powers up audio subsystem after a suspend */
  int snd_soc_resume(struct device *dev)
  {
  	struct snd_soc_card *card = dev_get_drvdata(dev);
  	bool bus_control = false;
  	struct snd_soc_pcm_runtime *rtd;
  	struct snd_soc_dai *codec_dai;
  	int i;
  
  	/* If the card is not initialized yet there is nothing to do */
  	if (!card->instantiated)
  		return 0;
  
  	/* activate pins from sleep state */
  	for_each_card_rtds(card, rtd) {
  		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  
  		if (cpu_dai->active)
  			pinctrl_pm_select_default_state(cpu_dai->dev);
  
  		for_each_rtd_codec_dai(rtd, i, codec_dai) {
  			if (codec_dai->active)
  				pinctrl_pm_select_default_state(codec_dai->dev);
  		}
  	}
  
  	/*
  	 * DAIs that also act as the control bus master might have other drivers
  	 * hanging off them so need to resume immediately. Other drivers don't
  	 * have that problem and may take a substantial amount of time to resume
  	 * due to I/O costs and anti-pop so handle them out of line.
  	 */
  	for_each_card_rtds(card, rtd) {
  		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  
  		bus_control |= cpu_dai->driver->bus_control;
  	}
  	if (bus_control) {
  		dev_dbg(dev, "ASoC: Resuming control bus master immediately\n");
  		soc_resume_deferred(&card->deferred_resume_work);
  	} else {
  		dev_dbg(dev, "ASoC: Scheduling resume work\n");
  		if (!schedule_work(&card->deferred_resume_work))
  			dev_err(dev, "ASoC: resume work item may be lost\n");
  	}
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_resume);
  #else
  #define snd_soc_suspend NULL
  #define snd_soc_resume NULL
  #endif
  
  static const struct snd_soc_dai_ops null_dai_ops = {
  };
  
  static struct device_node
  *soc_component_to_node(struct snd_soc_component *component)
  {
  	struct device_node *of_node;
  
  	of_node = component->dev->of_node;
  	if (!of_node && component->dev->parent)
  		of_node = component->dev->parent->of_node;
  
  	return of_node;
  }
  
  static int snd_soc_is_matching_component(
  	const struct snd_soc_dai_link_component *dlc,
  	struct snd_soc_component *component)
  {
  	struct device_node *component_of_node;
  
  	if (!dlc)
  		return 0;
  
  	component_of_node = soc_component_to_node(component);
  
  	if (dlc->of_node && component_of_node != dlc->of_node)
  		return 0;
  	if (dlc->name && strcmp(component->name, dlc->name))
  		return 0;
  
  	return 1;
  }
  
  static struct snd_soc_component *soc_find_component(
  	const struct snd_soc_dai_link_component *dlc)
  {
  	struct snd_soc_component *component;
  
  	lockdep_assert_held(&client_mutex);
  
  	/*
  	 * NOTE
  	 *
  	 * It returns *1st* found component, but some driver
  	 * has few components by same of_node/name
  	 * ex)
  	 *	CPU component and generic DMAEngine component
  	 */
  	for_each_component(component)
  		if (snd_soc_is_matching_component(dlc, component))
  			return component;
  
  	return NULL;
  }
  
  /**
   * snd_soc_find_dai - Find a registered DAI
   *
   * @dlc: name of the DAI or the DAI driver and optional component info to match
   *
   * This function will search all registered components and their DAIs to
   * find the DAI of the same name. The component's of_node and name
   * should also match if being specified.
   *
   * Return: pointer of DAI, or NULL if not found.
   */
  struct snd_soc_dai *snd_soc_find_dai(
  	const struct snd_soc_dai_link_component *dlc)
  {
  	struct snd_soc_component *component;
  	struct snd_soc_dai *dai;
  
  	lockdep_assert_held(&client_mutex);
  
  	/* Find CPU DAI from registered DAIs */
  	for_each_component(component) {
  		if (!snd_soc_is_matching_component(dlc, component))
  			continue;
  		for_each_component_dais(component, dai) {
  			if (dlc->dai_name && strcmp(dai->name, dlc->dai_name)
  			    && (!dai->driver->name
  				|| strcmp(dai->driver->name, dlc->dai_name)))
  				continue;
  
  			return dai;
  		}
  	}
  
  	return NULL;
  }
  EXPORT_SYMBOL_GPL(snd_soc_find_dai);
  
  /**
   * snd_soc_find_dai_link - Find a DAI link
   *
   * @card: soc card
   * @id: DAI link ID to match
   * @name: DAI link name to match, optional
   * @stream_name: DAI link stream name to match, optional
   *
   * This function will search all existing DAI links of the soc card to
   * find the link of the same ID. Since DAI links may not have their
   * unique ID, so name and stream name should also match if being
   * specified.
   *
   * Return: pointer of DAI link, or NULL if not found.
   */
  struct snd_soc_dai_link *snd_soc_find_dai_link(struct snd_soc_card *card,
  					       int id, const char *name,
  					       const char *stream_name)
  {
  	struct snd_soc_dai_link *link, *_link;
  
  	lockdep_assert_held(&client_mutex);
  
  	for_each_card_links_safe(card, link, _link) {
  		if (link->id != id)
  			continue;
  
  		if (name && (!link->name || strcmp(name, link->name)))
  			continue;
  
  		if (stream_name && (!link->stream_name
  			|| strcmp(stream_name, link->stream_name)))
  			continue;
  
  		return link;
  	}
  
  	return NULL;
  }
  EXPORT_SYMBOL_GPL(snd_soc_find_dai_link);
  
  static bool soc_is_dai_link_bound(struct snd_soc_card *card,
  		struct snd_soc_dai_link *dai_link)
  {
  	struct snd_soc_pcm_runtime *rtd;
  
  	for_each_card_rtds(card, rtd) {
  		if (rtd->dai_link == dai_link)
  			return true;
  	}
  
  	return false;
  }
  
  static int soc_bind_dai_link(struct snd_soc_card *card,
  	struct snd_soc_dai_link *dai_link)
  {
  	struct snd_soc_pcm_runtime *rtd;
  	struct snd_soc_dai_link_component *codec, *platform;
  	struct snd_soc_component *component;
  	int i;
  
  	if (dai_link->ignore)
  		return 0;
  
  	dev_dbg(card->dev, "ASoC: binding %s\n", dai_link->name);
  
  	if (soc_is_dai_link_bound(card, dai_link)) {
  		dev_dbg(card->dev, "ASoC: dai link %s already bound\n",
  			dai_link->name);
  		return 0;
  	}
  
  	rtd = soc_new_pcm_runtime(card, dai_link);
  	if (!rtd)
  		return -ENOMEM;
  
  	/* FIXME: we need multi CPU support in the future */
  	rtd->cpu_dai = snd_soc_find_dai(dai_link->cpus);
  	if (!rtd->cpu_dai) {
  		dev_info(card->dev, "ASoC: CPU DAI %s not registered\n",
  			 dai_link->cpus->dai_name);
  		goto _err_defer;
  	}
  	snd_soc_rtdcom_add(rtd, rtd->cpu_dai->component);
  
  	/* Find CODEC from registered CODECs */
  	rtd->num_codecs = dai_link->num_codecs;
  	for_each_link_codecs(dai_link, i, codec) {
  		rtd->codec_dais[i] = snd_soc_find_dai(codec);
  		if (!rtd->codec_dais[i]) {
  			dev_info(card->dev, "ASoC: CODEC DAI %s not registered\n",
  				 codec->dai_name);
  			goto _err_defer;
  		}
  
  		snd_soc_rtdcom_add(rtd, rtd->codec_dais[i]->component);
  	}
  
  	/* Single codec links expect codec and codec_dai in runtime data */
  	rtd->codec_dai = rtd->codec_dais[0];
  
  	/* Find PLATFORM from registered PLATFORMs */
  	for_each_link_platforms(dai_link, i, platform) {
  		for_each_component(component) {
  			if (!snd_soc_is_matching_component(platform, component))
  				continue;
  
  			snd_soc_rtdcom_add(rtd, component);
  		}
  	}
  
  	soc_add_pcm_runtime(card, rtd);
  	return 0;
  
  _err_defer:
  	soc_free_pcm_runtime(rtd);
  	return -EPROBE_DEFER;
  }
  
  static void soc_cleanup_component(struct snd_soc_component *component)
  {
  	snd_soc_component_set_jack(component, NULL, NULL);
  	list_del(&component->card_list);
  	snd_soc_dapm_free(snd_soc_component_get_dapm(component));
  	soc_cleanup_component_debugfs(component);
  	component->card = NULL;
  	if (!component->driver->module_get_upon_open)
  		module_put(component->dev->driver->owner);
  }
  
  static void soc_remove_component(struct snd_soc_component *component)
  {
  	if (!component->card)
  		return;
  
  	if (component->driver->remove)
  		component->driver->remove(component);
  
  	soc_cleanup_component(component);
  }
  
  static void soc_remove_dai(struct snd_soc_dai *dai, int order)
  {
  	int err;
  
  	if (!dai || !dai->probed || !dai->driver ||
  	    dai->driver->remove_order != order)
  		return;
  
  	if (dai->driver->remove) {
  		err = dai->driver->remove(dai);
  		if (err < 0)
  			dev_err(dai->dev,
  				"ASoC: failed to remove %s: %d\n",
  				dai->name, err);
  	}
  	dai->probed = 0;
  }
  
  static void soc_remove_link_dais(struct snd_soc_card *card,
  		struct snd_soc_pcm_runtime *rtd, int order)
  {
  	int i;
  	struct snd_soc_dai *codec_dai;
  
  	/* unregister the rtd device */
  	if (rtd->dev_registered) {
  		device_unregister(rtd->dev);
  		rtd->dev_registered = 0;
  	}
  
  	/* remove the CODEC DAI */
  	for_each_rtd_codec_dai(rtd, i, codec_dai)
  		soc_remove_dai(codec_dai, order);
  
  	soc_remove_dai(rtd->cpu_dai, order);
  }
  
  static void soc_remove_link_components(struct snd_soc_card *card,
  	struct snd_soc_pcm_runtime *rtd, int order)
  {
  	struct snd_soc_component *component;
  	struct snd_soc_rtdcom_list *rtdcom;
  
  	for_each_rtdcom(rtd, rtdcom) {
  		component = rtdcom->component;
  
  		if (component->driver->remove_order == order)
  			soc_remove_component(component);
  	}
  }
  
  static void soc_remove_dai_links(struct snd_soc_card *card)
  {
  	int order;
  	struct snd_soc_pcm_runtime *rtd;
  	struct snd_soc_dai_link *link, *_link;
  
  	for_each_comp_order(order) {
  		for_each_card_rtds(card, rtd)
  			soc_remove_link_dais(card, rtd, order);
  	}
  
  	for_each_comp_order(order) {
  		for_each_card_rtds(card, rtd)
  			soc_remove_link_components(card, rtd, order);
  	}
  
  	for_each_card_links_safe(card, link, _link) {
  		if (link->dobj.type == SND_SOC_DOBJ_DAI_LINK)
  			dev_warn(card->dev, "Topology forgot to remove link %s?\n",
  				link->name);
  
  		list_del(&link->list);
  	}
  }
  
  static int soc_init_dai_link(struct snd_soc_card *card,
  			     struct snd_soc_dai_link *link)
  {
  	int i;
  	struct snd_soc_dai_link_component *codec, *platform;
  
  	for_each_link_codecs(link, i, codec) {
  		/*
  		 * Codec must be specified by 1 of name or OF node,
  		 * not both or neither.
  		 */
  		if (!!codec->name == !!codec->of_node) {
  			dev_err(card->dev, "ASoC: Neither/both codec name/of_node are set for %s\n",
  				link->name);
  			return -EINVAL;
  		}
  
  		/* Codec DAI name must be specified */
  		if (!codec->dai_name) {
  			dev_err(card->dev, "ASoC: codec_dai_name not set for %s\n",
  				link->name);
  			return -EINVAL;
  		}
  
  		/*
  		 * Defer card registration if codec component is not added to
  		 * component list.
  		 */
  		if (!soc_find_component(codec))
  			return -EPROBE_DEFER;
  	}
  
  	for_each_link_platforms(link, i, platform) {
  		/*
  		 * Platform may be specified by either name or OF node, but it
  		 * can be left unspecified, then no components will be inserted
  		 * in the rtdcom list
  		 */
  		if (!!platform->name == !!platform->of_node) {
  			dev_err(card->dev,
  				"ASoC: Neither/both platform name/of_node are set for %s\n",
  				link->name);
  			return -EINVAL;
  		}
  
  		/*
  		 * Defer card registration if platform component is not added to
  		 * component list.
  		 */
  		if (!soc_find_component(platform))
  			return -EPROBE_DEFER;
  	}
  
  	/* FIXME */
  	if (link->num_cpus > 1) {
  		dev_err(card->dev,
  			"ASoC: multi cpu is not yet supported %s\n",
  			link->name);
  		return -EINVAL;
  	}
  
  	/*
  	 * CPU device may be specified by either name or OF node, but
  	 * can be left unspecified, and will be matched based on DAI
  	 * name alone..
  	 */
  	if (link->cpus->name && link->cpus->of_node) {
  		dev_err(card->dev,
  			"ASoC: Neither/both cpu name/of_node are set for %s\n",
  			link->name);
  		return -EINVAL;
  	}
  
  	/*
  	 * Defer card registartion if cpu dai component is not added to
  	 * component list.
  	 */
  	if ((link->cpus->of_node || link->cpus->name) &&
  	    !soc_find_component(link->cpus))
  		return -EPROBE_DEFER;
  
  	/*
  	 * At least one of CPU DAI name or CPU device name/node must be
  	 * specified
  	 */
  	if (!link->cpus->dai_name &&
  	    !(link->cpus->name || link->cpus->of_node)) {
  		dev_err(card->dev,
  			"ASoC: Neither cpu_dai_name nor cpu_name/of_node are set for %s\n",
  			link->name);
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  void snd_soc_disconnect_sync(struct device *dev)
  {
  	struct snd_soc_component *component =
  			snd_soc_lookup_component(dev, NULL);
  
  	if (!component || !component->card)
  		return;
  
  	snd_card_disconnect_sync(component->card->snd_card);
  }
  EXPORT_SYMBOL_GPL(snd_soc_disconnect_sync);
  
  /**
   * snd_soc_add_dai_link - Add a DAI link dynamically
   * @card: The ASoC card to which the DAI link is added
   * @dai_link: The new DAI link to add
   *
   * This function adds a DAI link to the ASoC card's link list.
   *
   * Note: Topology can use this API to add DAI links when probing the
   * topology component. And machine drivers can still define static
   * DAI links in dai_link array.
   */
  int snd_soc_add_dai_link(struct snd_soc_card *card,
  		struct snd_soc_dai_link *dai_link)
  {
  	if (dai_link->dobj.type
  	    && dai_link->dobj.type != SND_SOC_DOBJ_DAI_LINK) {
  		dev_err(card->dev, "Invalid dai link type %d\n",
  			dai_link->dobj.type);
  		return -EINVAL;
  	}
  
  	lockdep_assert_held(&client_mutex);
  	/*
  	 * Notify the machine driver for extra initialization
  	 * on the link created by topology.
  	 */
  	if (dai_link->dobj.type && card->add_dai_link)
  		card->add_dai_link(card, dai_link);
  
  	list_add_tail(&dai_link->list, &card->dai_link_list);
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_add_dai_link);
  
  /**
   * snd_soc_remove_dai_link - Remove a DAI link from the list
   * @card: The ASoC card that owns the link
   * @dai_link: The DAI link to remove
   *
   * This function removes a DAI link from the ASoC card's link list.
   *
   * For DAI links previously added by topology, topology should
   * remove them by using the dobj embedded in the link.
   */
  void snd_soc_remove_dai_link(struct snd_soc_card *card,
  			     struct snd_soc_dai_link *dai_link)
  {
  	struct snd_soc_dai_link *link, *_link;
  
  	if (dai_link->dobj.type
  	    && dai_link->dobj.type != SND_SOC_DOBJ_DAI_LINK) {
  		dev_err(card->dev, "Invalid dai link type %d\n",
  			dai_link->dobj.type);
  		return;
  	}
  
  	lockdep_assert_held(&client_mutex);
  	/*
  	 * Notify the machine driver for extra destruction
  	 * on the link created by topology.
  	 */
  	if (dai_link->dobj.type && card->remove_dai_link)
  		card->remove_dai_link(card, dai_link);
  
  	for_each_card_links_safe(card, link, _link) {
  		if (link == dai_link) {
  			list_del(&link->list);
  			return;
  		}
  	}
  }
  EXPORT_SYMBOL_GPL(snd_soc_remove_dai_link);
  
  static void soc_set_of_name_prefix(struct snd_soc_component *component)
  {
  	struct device_node *component_of_node = soc_component_to_node(component);
  	const char *str;
  	int ret;
  
  	ret = of_property_read_string(component_of_node, "sound-name-prefix",
  				      &str);
  	if (!ret)
  		component->name_prefix = str;
  }
  
  static void soc_set_name_prefix(struct snd_soc_card *card,
  				struct snd_soc_component *component)
  {
  	int i;
  
  	for (i = 0; i < card->num_configs && card->codec_conf; i++) {
  		struct snd_soc_codec_conf *map = &card->codec_conf[i];
  		struct device_node *component_of_node = soc_component_to_node(component);
  
  		if (map->of_node && component_of_node != map->of_node)
  			continue;
  		if (map->dev_name && strcmp(component->name, map->dev_name))
  			continue;
  		component->name_prefix = map->name_prefix;
  		return;
  	}
  
  	/*
  	 * If there is no configuration table or no match in the table,
  	 * check if a prefix is provided in the node
  	 */
  	soc_set_of_name_prefix(component);
  }
  
  static int soc_probe_component(struct snd_soc_card *card,
  	struct snd_soc_component *component)
  {
  	struct snd_soc_dapm_context *dapm =
  			snd_soc_component_get_dapm(component);
  	struct snd_soc_dai *dai;
  	int ret;
  
  	if (!strcmp(component->name, "snd-soc-dummy"))
  		return 0;
  
  	if (component->card) {
  		if (component->card != card) {
  			dev_err(component->dev,
  				"Trying to bind component to card \"%s\" but is already bound to card \"%s\"\n",
  				card->name, component->card->name);
  			return -ENODEV;
  		}
  		return 0;
  	}
  
  	if (!component->driver->module_get_upon_open &&
  	    !try_module_get(component->dev->driver->owner))
  		return -ENODEV;
  
  	component->card = card;
  	dapm->card = card;
  	INIT_LIST_HEAD(&component->card_list);
  	INIT_LIST_HEAD(&dapm->list);
  	soc_set_name_prefix(card, component);
  
  	soc_init_component_debugfs(component);
  
  	if (component->driver->dapm_widgets) {
  		ret = snd_soc_dapm_new_controls(dapm,
  					component->driver->dapm_widgets,
  					component->driver->num_dapm_widgets);
  
  		if (ret != 0) {
  			dev_err(component->dev,
  				"Failed to create new controls %d\n", ret);
  			goto err_probe;
  		}
  	}
  
  	for_each_component_dais(component, dai) {
  		ret = snd_soc_dapm_new_dai_widgets(dapm, dai);
  		if (ret != 0) {
  			dev_err(component->dev,
  				"Failed to create DAI widgets %d\n", ret);
  			goto err_probe;
  		}
  	}
  
  	if (component->driver->probe) {
  		ret = component->driver->probe(component);
  		if (ret < 0) {
  			dev_err(component->dev,
  				"ASoC: failed to probe component %d\n", ret);
  			goto err_probe;
  		}
  	}
  	WARN(dapm->idle_bias_off &&
  	     dapm->bias_level != SND_SOC_BIAS_OFF,
  	     "codec %s can not start from non-off bias with idle_bias_off==1\n",
  	     component->name);
  
  	/* machine specific init */
  	if (component->init) {
  		ret = component->init(component);
  		if (ret < 0) {
  			dev_err(component->dev,
  				"Failed to do machine specific init %d\n", ret);
  			goto err_probe;
  		}
  	}
  
  	if (component->driver->controls)
  		snd_soc_add_component_controls(component,
  					       component->driver->controls,
  					       component->driver->num_controls);
  	if (component->driver->dapm_routes)
  		snd_soc_dapm_add_routes(dapm,
  					component->driver->dapm_routes,
  					component->driver->num_dapm_routes);
  
  	list_add(&dapm->list, &card->dapm_list);
  	/* see for_each_card_components */
  	list_add(&component->card_list, &card->component_dev_list);
  
  err_probe:
  	if (ret < 0)
  		soc_cleanup_component(component);
  
  	return ret;
  }
  
  static void rtd_release(struct device *dev)
  {
  	kfree(dev);
  }
  
  static int soc_post_component_init(struct snd_soc_pcm_runtime *rtd,
  	const char *name)
  {
  	int ret = 0;
  
  	/* register the rtd device */
  	rtd->dev = kzalloc(sizeof(struct device), GFP_KERNEL);
  	if (!rtd->dev)
  		return -ENOMEM;
  	device_initialize(rtd->dev);
  	rtd->dev->parent = rtd->card->dev;
  	rtd->dev->release = rtd_release;
  	rtd->dev->groups = soc_dev_attr_groups;
  	dev_set_name(rtd->dev, "%s", name);
  	dev_set_drvdata(rtd->dev, rtd);
  	mutex_init(&rtd->pcm_mutex);
  	INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients);
  	INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_CAPTURE].be_clients);
  	INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_PLAYBACK].fe_clients);
  	INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_CAPTURE].fe_clients);
  	ret = device_add(rtd->dev);
  	if (ret < 0) {
  		/* calling put_device() here to free the rtd->dev */
  		put_device(rtd->dev);
  		dev_err(rtd->card->dev,
  			"ASoC: failed to register runtime device: %d\n", ret);
  		return ret;
  	}
  	rtd->dev_registered = 1;
  	return 0;
  }
  
  static int soc_probe_link_components(struct snd_soc_card *card,
  				     struct snd_soc_pcm_runtime *rtd, int order)
  {
  	struct snd_soc_component *component;
  	struct snd_soc_rtdcom_list *rtdcom;
  	int ret;
  
  	for_each_rtdcom(rtd, rtdcom) {
  		component = rtdcom->component;
  
  		if (component->driver->probe_order == order) {
  			ret = soc_probe_component(card, component);
  			if (ret < 0)
  				return ret;
  		}
  	}
  
  	return 0;
  }
  
  static int soc_probe_dai(struct snd_soc_dai *dai, int order)
  {
  	if (dai->probed ||
  	    dai->driver->probe_order != order)
  		return 0;
  
  	if (dai->driver->probe) {
  		int ret = dai->driver->probe(dai);
  
  		if (ret < 0) {
  			dev_err(dai->dev, "ASoC: failed to probe DAI %s: %d\n",
  				dai->name, ret);
  			return ret;
  		}
  	}
  
  	dai->probed = 1;
  
  	return 0;
  }
  
  static int soc_link_dai_pcm_new(struct snd_soc_dai **dais, int num_dais,
  				struct snd_soc_pcm_runtime *rtd)
  {
  	int i, ret = 0;
  
  	for (i = 0; i < num_dais; ++i) {
  		struct snd_soc_dai_driver *drv = dais[i]->driver;
  
  		if (drv->pcm_new)
  			ret = drv->pcm_new(rtd, dais[i]);
  		if (ret < 0) {
  			dev_err(dais[i]->dev,
  				"ASoC: Failed to bind %s with pcm device\n",
  				dais[i]->name);
  			return ret;
  		}
  	}
  
  	return 0;
  }
  
  static int soc_probe_link_dais(struct snd_soc_card *card,
  		struct snd_soc_pcm_runtime *rtd, int order)
  {
  	struct snd_soc_dai_link *dai_link = rtd->dai_link;
  	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  	struct snd_soc_rtdcom_list *rtdcom;
  	struct snd_soc_component *component;
  	struct snd_soc_dai *codec_dai;
  	int i, ret, num;
  
  	dev_dbg(card->dev, "ASoC: probe %s dai link %d late %d\n",
  			card->name, rtd->num, order);
  
  	/* set default power off timeout */
  	rtd->pmdown_time = pmdown_time;
  
  	ret = soc_probe_dai(cpu_dai, order);
  	if (ret)
  		return ret;
  
  	/* probe the CODEC DAI */
  	for_each_rtd_codec_dai(rtd, i, codec_dai) {
  		ret = soc_probe_dai(codec_dai, order);
  		if (ret)
  			return ret;
  	}
  
  	/* complete DAI probe during last probe */
  	if (order != SND_SOC_COMP_ORDER_LAST)
  		return 0;
  
  	/* do machine specific initialization */
  	if (dai_link->init) {
  		ret = dai_link->init(rtd);
  		if (ret < 0) {
  			dev_err(card->dev, "ASoC: failed to init %s: %d\n",
  				dai_link->name, ret);
  			return ret;
  		}
  	}
  
  	if (dai_link->dai_fmt) {
  		ret = snd_soc_runtime_set_dai_fmt(rtd, dai_link->dai_fmt);
  		if (ret)
  			return ret;
  	}
  
  	ret = soc_post_component_init(rtd, dai_link->name);
  	if (ret)
  		return ret;
  
  #ifdef CONFIG_DEBUG_FS
  	/* add DPCM sysfs entries */
  	if (dai_link->dynamic)
  		soc_dpcm_debugfs_add(rtd);
  #endif
  
  	num = rtd->num;
  
  	/*
  	 * most drivers will register their PCMs using DAI link ordering but
  	 * topology based drivers can use the DAI link id field to set PCM
  	 * device number and then use rtd + a base offset of the BEs.
  	 */
  	for_each_rtdcom(rtd, rtdcom) {
  		component = rtdcom->component;
  
  		if (!component->driver->use_dai_pcm_id)
  			continue;
  
  		if (rtd->dai_link->no_pcm)
  			num += component->driver->be_pcm_base;
  		else
  			num = rtd->dai_link->id;
  	}
  
  	if (cpu_dai->driver->compress_new) {
  		/* create compress_device" */
  		ret = cpu_dai->driver->compress_new(rtd, num);
  		if (ret < 0) {
  			dev_err(card->dev, "ASoC: can't create compress %s\n",
  					 dai_link->stream_name);
  			return ret;
  		}
  	} else if (!dai_link->params) {
  		/* create the pcm */
  		ret = soc_new_pcm(rtd, num);
  		if (ret < 0) {
  			dev_err(card->dev, "ASoC: can't create pcm %s :%d\n",
  				dai_link->stream_name, ret);
  			return ret;
  		}
  		ret = soc_link_dai_pcm_new(&cpu_dai, 1, rtd);
  		if (ret < 0)
  			return ret;
  		ret = soc_link_dai_pcm_new(rtd->codec_dais,
  					   rtd->num_codecs, rtd);
  		if (ret < 0)
  			return ret;
  	} else {
  		INIT_DELAYED_WORK(&rtd->delayed_work,
  				  codec2codec_close_delayed_work);
  	}
  
  	return 0;
  }
  
  static int soc_bind_aux_dev(struct snd_soc_card *card, int num)
  {
  	struct snd_soc_aux_dev *aux_dev = &card->aux_dev[num];
  	struct snd_soc_component *component;
  	struct snd_soc_dai_link_component dlc;
  
  	if (aux_dev->codec_of_node || aux_dev->codec_name) {
  		/* codecs, usually analog devices */
  		dlc.name = aux_dev->codec_name;
  		dlc.of_node = aux_dev->codec_of_node;
  		component = soc_find_component(&dlc);
  		if (!component) {
  			if (dlc.of_node)
  				dlc.name = of_node_full_name(dlc.of_node);
  			goto err_defer;
  		}
  	} else if (aux_dev->name) {
  		/* generic components */
  		dlc.name = aux_dev->name;
  		dlc.of_node = NULL;
  		component = soc_find_component(&dlc);
  		if (!component)
  			goto err_defer;
  	} else {
  		dev_err(card->dev, "ASoC: Invalid auxiliary device\n");
  		return -EINVAL;
  	}
  
  	component->init = aux_dev->init;
  	list_add(&component->card_aux_list, &card->aux_comp_list);
  
  	return 0;
  
  err_defer:
  	dev_err(card->dev, "ASoC: %s not registered\n", dlc.name);
  	return -EPROBE_DEFER;
  }
  
  static int soc_probe_aux_devices(struct snd_soc_card *card)
  {
  	struct snd_soc_component *comp;
  	int order;
  	int ret;
  
  	for_each_comp_order(order) {
  		list_for_each_entry(comp, &card->aux_comp_list, card_aux_list) {
  			if (comp->driver->probe_order == order) {
  				ret = soc_probe_component(card,	comp);
  				if (ret < 0) {
  					dev_err(card->dev,
  						"ASoC: failed to probe aux component %s %d\n",
  						comp->name, ret);
  					return ret;
  				}
  			}
  		}
  	}
  
  	return 0;
  }
  
  static void soc_remove_aux_devices(struct snd_soc_card *card)
  {
  	struct snd_soc_component *comp, *_comp;
  	int order;
  
  	for_each_comp_order(order) {
  		list_for_each_entry_safe(comp, _comp,
  			&card->aux_comp_list, card_aux_list) {
  
  			if (comp->driver->remove_order == order) {
  				soc_remove_component(comp);
  				/* remove it from the card's aux_comp_list */
  				list_del(&comp->card_aux_list);
  			}
  		}
  	}
  }
  
  /**
   * snd_soc_runtime_set_dai_fmt() - Change DAI link format for a ASoC runtime
   * @rtd: The runtime for which the DAI link format should be changed
   * @dai_fmt: The new DAI link format
   *
   * This function updates the DAI link format for all DAIs connected to the DAI
   * link for the specified runtime.
   *
   * Note: For setups with a static format set the dai_fmt field in the
   * corresponding snd_dai_link struct instead of using this function.
   *
   * Returns 0 on success, otherwise a negative error code.
   */
  int snd_soc_runtime_set_dai_fmt(struct snd_soc_pcm_runtime *rtd,
  	unsigned int dai_fmt)
  {
  	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  	struct snd_soc_dai *codec_dai;
  	unsigned int i;
  	int ret;
  
  	for_each_rtd_codec_dai(rtd, i, codec_dai) {
  		ret = snd_soc_dai_set_fmt(codec_dai, dai_fmt);
  		if (ret != 0 && ret != -ENOTSUPP) {
  			dev_warn(codec_dai->dev,
  				 "ASoC: Failed to set DAI format: %d\n", ret);
  			return ret;
  		}
  	}
  
  	/*
  	 * Flip the polarity for the "CPU" end of a CODEC<->CODEC link
  	 * the component which has non_legacy_dai_naming is Codec
  	 */
  	if (cpu_dai->component->driver->non_legacy_dai_naming) {
  		unsigned int inv_dai_fmt;
  
  		inv_dai_fmt = dai_fmt & ~SND_SOC_DAIFMT_MASTER_MASK;
  		switch (dai_fmt & SND_SOC_DAIFMT_MASTER_MASK) {
  		case SND_SOC_DAIFMT_CBM_CFM:
  			inv_dai_fmt |= SND_SOC_DAIFMT_CBS_CFS;
  			break;
  		case SND_SOC_DAIFMT_CBM_CFS:
  			inv_dai_fmt |= SND_SOC_DAIFMT_CBS_CFM;
  			break;
  		case SND_SOC_DAIFMT_CBS_CFM:
  			inv_dai_fmt |= SND_SOC_DAIFMT_CBM_CFS;
  			break;
  		case SND_SOC_DAIFMT_CBS_CFS:
  			inv_dai_fmt |= SND_SOC_DAIFMT_CBM_CFM;
  			break;
  		}
  
  		dai_fmt = inv_dai_fmt;
  	}
  
  	ret = snd_soc_dai_set_fmt(cpu_dai, dai_fmt);
  	if (ret != 0 && ret != -ENOTSUPP) {
  		dev_warn(cpu_dai->dev,
  			 "ASoC: Failed to set DAI format: %d\n", ret);
  		return ret;
  	}
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_runtime_set_dai_fmt);
  
  #ifdef CONFIG_DMI
  /*
   * Trim special characters, and replace '-' with '_' since '-' is used to
   * separate different DMI fields in the card long name. Only number and
   * alphabet characters and a few separator characters are kept.
   */
  static void cleanup_dmi_name(char *name)
  {
  	int i, j = 0;
  
  	for (i = 0; name[i]; i++) {
  		if (isalnum(name[i]) || (name[i] == '.')
  		    || (name[i] == '_'))
  			name[j++] = name[i];
  		else if (name[i] == '-')
  			name[j++] = '_';
  	}
  
  	name[j] = '\0';
  }
  
  /*
   * Check if a DMI field is valid, i.e. not containing any string
   * in the black list.
   */
  static int is_dmi_valid(const char *field)
  {
  	int i = 0;
  
  	while (dmi_blacklist[i]) {
  		if (strstr(field, dmi_blacklist[i]))
  			return 0;
  		i++;
  	}
  
  	return 1;
  }
  
  /**
   * snd_soc_set_dmi_name() - Register DMI names to card
   * @card: The card to register DMI names
   * @flavour: The flavour "differentiator" for the card amongst its peers.
   *
   * An Intel machine driver may be used by many different devices but are
   * difficult for userspace to differentiate, since machine drivers ususally
   * use their own name as the card short name and leave the card long name
   * blank. To differentiate such devices and fix bugs due to lack of
   * device-specific configurations, this function allows DMI info to be used
   * as the sound card long name, in the format of
   * "vendor-product-version-board"
   * (Character '-' is used to separate different DMI fields here).
   * This will help the user space to load the device-specific Use Case Manager
   * (UCM) configurations for the card.
   *
   * Possible card long names may be:
   * DellInc.-XPS139343-01-0310JH
   * ASUSTeKCOMPUTERINC.-T100TA-1.0-T100TA
   * Circuitco-MinnowboardMaxD0PLATFORM-D0-MinnowBoardMAX
   *
   * This function also supports flavoring the card longname to provide
   * the extra differentiation, like "vendor-product-version-board-flavor".
   *
   * We only keep number and alphabet characters and a few separator characters
   * in the card long name since UCM in the user space uses the card long names
   * as card configuration directory names and AudoConf cannot support special
   * charactors like SPACE.
   *
   * Returns 0 on success, otherwise a negative error code.
   */
  int snd_soc_set_dmi_name(struct snd_soc_card *card, const char *flavour)
  {
  	const char *vendor, *product, *product_version, *board;
  	size_t longname_buf_size = sizeof(card->snd_card->longname);
  	size_t len;
  
  	if (card->long_name)
  		return 0; /* long name already set by driver or from DMI */
  
  	/* make up dmi long name as: vendor.product.version.board */
  	vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
  	if (!vendor || !is_dmi_valid(vendor)) {
  		dev_warn(card->dev, "ASoC: no DMI vendor name!\n");
  		return 0;
  	}
  
  	snprintf(card->dmi_longname, sizeof(card->snd_card->longname),
  			 "%s", vendor);
  	cleanup_dmi_name(card->dmi_longname);
  
  	product = dmi_get_system_info(DMI_PRODUCT_NAME);
  	if (product && is_dmi_valid(product)) {
  		len = strlen(card->dmi_longname);
  		snprintf(card->dmi_longname + len,
  			 longname_buf_size - len,
  			 "-%s", product);
  
  		len++;	/* skip the separator "-" */
  		if (len < longname_buf_size)
  			cleanup_dmi_name(card->dmi_longname + len);
  
  		/*
  		 * some vendors like Lenovo may only put a self-explanatory
  		 * name in the product version field
  		 */
  		product_version = dmi_get_system_info(DMI_PRODUCT_VERSION);
  		if (product_version && is_dmi_valid(product_version)) {
  			len = strlen(card->dmi_longname);
  			snprintf(card->dmi_longname + len,
  				 longname_buf_size - len,
  				 "-%s", product_version);
  
  			len++;
  			if (len < longname_buf_size)
  				cleanup_dmi_name(card->dmi_longname + len);
  		}
  	}
  
  	board = dmi_get_system_info(DMI_BOARD_NAME);
  	if (board && is_dmi_valid(board)) {
  		len = strlen(card->dmi_longname);
  		snprintf(card->dmi_longname + len,
  			 longname_buf_size - len,
  			 "-%s", board);
  
  		len++;
  		if (len < longname_buf_size)
  			cleanup_dmi_name(card->dmi_longname + len);
  	} else if (!product) {
  		/* fall back to using legacy name */
  		dev_warn(card->dev, "ASoC: no DMI board/product name!\n");
  		return 0;
  	}
  
  	/* Add flavour to dmi long name */
  	if (flavour) {
  		len = strlen(card->dmi_longname);
  		snprintf(card->dmi_longname + len,
  			 longname_buf_size - len,
  			 "-%s", flavour);
  
  		len++;
  		if (len < longname_buf_size)
  			cleanup_dmi_name(card->dmi_longname + len);
  	}
  
  	/* set the card long name */
  	card->long_name = card->dmi_longname;
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_set_dmi_name);
  #endif /* CONFIG_DMI */
  
  static void soc_check_tplg_fes(struct snd_soc_card *card)
  {
  	struct snd_soc_component *component;
  	const struct snd_soc_component_driver *comp_drv;
  	struct snd_soc_dai_link *dai_link;
  	int i;
  
  	for_each_component(component) {
  
  		/* does this component override FEs ? */
  		if (!component->driver->ignore_machine)
  			continue;
  
  		/* for this machine ? */
  		if (!strcmp(component->driver->ignore_machine,
  			    card->dev->driver->name))
  			goto match;
  		if (strcmp(component->driver->ignore_machine,
  			   dev_name(card->dev)))
  			continue;
  match:
  		/* machine matches, so override the rtd data */
  		for_each_card_prelinks(card, i, dai_link) {
  
  			/* ignore this FE */
  			if (dai_link->dynamic) {
  				dai_link->ignore = true;
  				continue;
  			}
  
  			dev_info(card->dev, "info: override FE DAI link %s\n",
  				 card->dai_link[i].name);
  
  			/* override platform component */
  			if (!dai_link->platforms) {
  				dev_err(card->dev, "init platform error");
  				continue;
  			}
  			dai_link->platforms->name = component->name;
  
  			/* convert non BE into BE */
  			dai_link->no_pcm = 1;
  
  			/* override any BE fixups */
  			dai_link->be_hw_params_fixup =
  				component->driver->be_hw_params_fixup;
  
  			/*
  			 * most BE links don't set stream name, so set it to
  			 * dai link name if it's NULL to help bind widgets.
  			 */
  			if (!dai_link->stream_name)
  				dai_link->stream_name = dai_link->name;
  		}
  
  		/* Inform userspace we are using alternate topology */
  		if (component->driver->topology_name_prefix) {
  
  			/* topology shortname created? */
  			if (!card->topology_shortname_created) {
  				comp_drv = component->driver;
  
  				snprintf(card->topology_shortname, 32, "%s-%s",
  					 comp_drv->topology_name_prefix,
  					 card->name);
  				card->topology_shortname_created = true;
  			}
  
  			/* use topology shortname */
  			card->name = card->topology_shortname;
  		}
  	}
  }
  
  static int soc_cleanup_card_resources(struct snd_soc_card *card)
  {
  	/* free the ALSA card at first; this syncs with pending operations */
  	if (card->snd_card) {
  		snd_card_free(card->snd_card);
  		card->snd_card = NULL;
  	}
  
  	/* remove and free each DAI */
  	soc_remove_dai_links(card);
  	soc_remove_pcm_runtimes(card);
  
  	/* remove auxiliary devices */
  	soc_remove_aux_devices(card);
  
  	snd_soc_dapm_free(&card->dapm);
  	soc_cleanup_card_debugfs(card);
  
  	/* remove the card */
  	if (card->remove)
  		card->remove(card);
  
  	return 0;
  }
  
  static int snd_soc_instantiate_card(struct snd_soc_card *card)
  {
  	struct snd_soc_pcm_runtime *rtd;
  	struct snd_soc_dai_link *dai_link;
  	int ret, i, order;
  
  	mutex_lock(&client_mutex);
  	for_each_card_prelinks(card, i, dai_link) {
  		ret = soc_init_dai_link(card, dai_link);
  		if (ret) {
  			dev_err(card->dev, "ASoC: failed to init link %s: %d\n",
  				dai_link->name, ret);
  			mutex_unlock(&client_mutex);
  			return ret;
  		}
  	}
  	mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_INIT);
  
  	card->dapm.bias_level = SND_SOC_BIAS_OFF;
  	card->dapm.dev = card->dev;
  	card->dapm.card = card;
  	list_add(&card->dapm.list, &card->dapm_list);
  
  	/* check whether any platform is ignore machine FE and using topology */
  	soc_check_tplg_fes(card);
  
  	/* bind DAIs */
  	for_each_card_prelinks(card, i, dai_link) {
  		ret = soc_bind_dai_link(card, dai_link);
  		if (ret != 0)
  			goto probe_end;
  	}
  
  	/* bind aux_devs too */
  	for (i = 0; i < card->num_aux_devs; i++) {
  		ret = soc_bind_aux_dev(card, i);
  		if (ret != 0)
  			goto probe_end;
  	}
  
  	/* add predefined DAI links to the list */
  	for_each_card_prelinks(card, i, dai_link)
  		snd_soc_add_dai_link(card, dai_link);
  
  	/* card bind complete so register a sound card */
  	ret = snd_card_new(card->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
  			card->owner, 0, &card->snd_card);
  	if (ret < 0) {
  		dev_err(card->dev,
  			"ASoC: can't create sound card for card %s: %d\n",
  			card->name, ret);
  		goto probe_end;
  	}
  
  	soc_init_card_debugfs(card);
  
  #ifdef CONFIG_DEBUG_FS
  	snd_soc_dapm_debugfs_init(&card->dapm, card->debugfs_card_root);
  #endif
  
  #ifdef CONFIG_PM_SLEEP
  	/* deferred resume work */
  	INIT_WORK(&card->deferred_resume_work, soc_resume_deferred);
  #endif
  
  	if (card->dapm_widgets)
  		snd_soc_dapm_new_controls(&card->dapm, card->dapm_widgets,
  					  card->num_dapm_widgets);
  
  	if (card->of_dapm_widgets)
  		snd_soc_dapm_new_controls(&card->dapm, card->of_dapm_widgets,
  					  card->num_of_dapm_widgets);
  
  	/* initialise the sound card only once */
  	if (card->probe) {
  		ret = card->probe(card);
  		if (ret < 0)
  			goto probe_end;
  	}
  
  	/* probe all components used by DAI links on this card */
  	for_each_comp_order(order) {
  		for_each_card_rtds(card, rtd) {
  			ret = soc_probe_link_components(card, rtd, order);
  			if (ret < 0) {
  				dev_err(card->dev,
  					"ASoC: failed to instantiate card %d\n",
  					ret);
  				goto probe_end;
  			}
  		}
  	}
  
  	/* probe auxiliary components */
  	ret = soc_probe_aux_devices(card);
  	if (ret < 0)
  		goto probe_end;
  
  	/*
  	 * Find new DAI links added during probing components and bind them.
  	 * Components with topology may bring new DAIs and DAI links.
  	 */
  	for_each_card_links(card, dai_link) {
  		if (soc_is_dai_link_bound(card, dai_link))
  			continue;
  
  		ret = soc_init_dai_link(card, dai_link);
  		if (ret)
  			goto probe_end;
  		ret = soc_bind_dai_link(card, dai_link);
  		if (ret)
  			goto probe_end;
  	}
  
  	/* probe all DAI links on this card */
  	for_each_comp_order(order) {
  		for_each_card_rtds(card, rtd) {
  			ret = soc_probe_link_dais(card, rtd, order);
  			if (ret < 0) {
  				dev_err(card->dev,
  					"ASoC: failed to instantiate card %d\n",
  					ret);
  				goto probe_end;
  			}
  		}
  	}
  
  	snd_soc_dapm_link_dai_widgets(card);
  	snd_soc_dapm_connect_dai_link_widgets(card);
  
  	if (card->controls)
  		snd_soc_add_card_controls(card, card->controls,
  					  card->num_controls);
  
  	if (card->dapm_routes)
  		snd_soc_dapm_add_routes(&card->dapm, card->dapm_routes,
  					card->num_dapm_routes);
  
  	if (card->of_dapm_routes)
  		snd_soc_dapm_add_routes(&card->dapm, card->of_dapm_routes,
  					card->num_of_dapm_routes);
  
  	/* try to set some sane longname if DMI is available */
  	snd_soc_set_dmi_name(card, NULL);
  
  	snprintf(card->snd_card->shortname, sizeof(card->snd_card->shortname),
  		 "%s", card->name);
  	snprintf(card->snd_card->longname, sizeof(card->snd_card->longname),
  		 "%s", card->long_name ? card->long_name : card->name);
  	snprintf(card->snd_card->driver, sizeof(card->snd_card->driver),
  		 "%s", card->driver_name ? card->driver_name : card->name);
  	for (i = 0; i < ARRAY_SIZE(card->snd_card->driver); i++) {
  		switch (card->snd_card->driver[i]) {
  		case '_':
  		case '-':
  		case '\0':
  			break;
  		default:
  			if (!isalnum(card->snd_card->driver[i]))
  				card->snd_card->driver[i] = '_';
  			break;
  		}
  	}
  
  	if (card->late_probe) {
  		ret = card->late_probe(card);
  		if (ret < 0) {
  			dev_err(card->dev, "ASoC: %s late_probe() failed: %d\n",
  				card->name, ret);
  			goto probe_end;
  		}
  	}
  
  	snd_soc_dapm_new_widgets(card);
  
  	ret = snd_card_register(card->snd_card);
  	if (ret < 0) {
  		dev_err(card->dev, "ASoC: failed to register soundcard %d\n",
  				ret);
  		goto probe_end;
  	}
  
  	card->instantiated = 1;
  	dapm_mark_endpoints_dirty(card);
  	snd_soc_dapm_sync(&card->dapm);
  
  probe_end:
  	if (ret < 0)
  		soc_cleanup_card_resources(card);
  
  	mutex_unlock(&card->mutex);
  	mutex_unlock(&client_mutex);
  
  	return ret;
  }
  
  /* probes a new socdev */
  static int soc_probe(struct platform_device *pdev)
  {
  	struct snd_soc_card *card = platform_get_drvdata(pdev);
  
  	/*
  	 * no card, so machine driver should be registering card
  	 * we should not be here in that case so ret error
  	 */
  	if (!card)
  		return -EINVAL;
  
  	dev_warn(&pdev->dev,
  		 "ASoC: machine %s should use snd_soc_register_card()\n",
  		 card->name);
  
  	/* Bodge while we unpick instantiation */
  	card->dev = &pdev->dev;
  
  	return snd_soc_register_card(card);
  }
  
  /* removes a socdev */
  static int soc_remove(struct platform_device *pdev)
  {
  	struct snd_soc_card *card = platform_get_drvdata(pdev);
  
  	snd_soc_unregister_card(card);
  	return 0;
  }
  
  int snd_soc_poweroff(struct device *dev)
  {
  	struct snd_soc_card *card = dev_get_drvdata(dev);
  	struct snd_soc_pcm_runtime *rtd;
  
  	if (!card->instantiated)
  		return 0;
  
  	/*
  	 * Flush out pmdown_time work - we actually do want to run it
  	 * now, we're shutting down so no imminent restart.
  	 */
  	snd_soc_flush_all_delayed_work(card);
  
  	snd_soc_dapm_shutdown(card);
  
  	/* deactivate pins to sleep state */
  	for_each_card_rtds(card, rtd) {
  		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  		struct snd_soc_dai *codec_dai;
  		int i;
  
  		pinctrl_pm_select_sleep_state(cpu_dai->dev);
  		for_each_rtd_codec_dai(rtd, i, codec_dai) {
  			pinctrl_pm_select_sleep_state(codec_dai->dev);
  		}
  	}
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_poweroff);
  
  const struct dev_pm_ops snd_soc_pm_ops = {
  	.suspend = snd_soc_suspend,
  	.resume = snd_soc_resume,
  	.freeze = snd_soc_suspend,
  	.thaw = snd_soc_resume,
  	.poweroff = snd_soc_poweroff,
  	.restore = snd_soc_resume,
  };
  EXPORT_SYMBOL_GPL(snd_soc_pm_ops);
  
  /* ASoC platform driver */
  static struct platform_driver soc_driver = {
  	.driver		= {
  		.name		= "soc-audio",
  		.pm		= &snd_soc_pm_ops,
  	},
  	.probe		= soc_probe,
  	.remove		= soc_remove,
  };
  
  /**
   * snd_soc_cnew - create new control
   * @_template: control template
   * @data: control private data
   * @long_name: control long name
   * @prefix: control name prefix
   *
   * Create a new mixer control from a template control.
   *
   * Returns 0 for success, else error.
   */
  struct snd_kcontrol *snd_soc_cnew(const struct snd_kcontrol_new *_template,
  				  void *data, const char *long_name,
  				  const char *prefix)
  {
  	struct snd_kcontrol_new template;
  	struct snd_kcontrol *kcontrol;
  	char *name = NULL;
  
  	memcpy(&template, _template, sizeof(template));
  	template.index = 0;
  
  	if (!long_name)
  		long_name = template.name;
  
  	if (prefix) {
  		name = kasprintf(GFP_KERNEL, "%s %s", prefix, long_name);
  		if (!name)
  			return NULL;
  
  		template.name = name;
  	} else {
  		template.name = long_name;
  	}
  
  	kcontrol = snd_ctl_new1(&template, data);
  
  	kfree(name);
  
  	return kcontrol;
  }
  EXPORT_SYMBOL_GPL(snd_soc_cnew);
  
  static int snd_soc_add_controls(struct snd_card *card, struct device *dev,
  	const struct snd_kcontrol_new *controls, int num_controls,
  	const char *prefix, void *data)
  {
  	int err, i;
  
  	for (i = 0; i < num_controls; i++) {
  		const struct snd_kcontrol_new *control = &controls[i];
  
  		err = snd_ctl_add(card, snd_soc_cnew(control, data,
  						     control->name, prefix));
  		if (err < 0) {
  			dev_err(dev, "ASoC: Failed to add %s: %d\n",
  				control->name, err);
  			return err;
  		}
  	}
  
  	return 0;
  }
  
  struct snd_kcontrol *snd_soc_card_get_kcontrol(struct snd_soc_card *soc_card,
  					       const char *name)
  {
  	struct snd_card *card = soc_card->snd_card;
  	struct snd_kcontrol *kctl;
  
  	if (unlikely(!name))
  		return NULL;
  
  	list_for_each_entry(kctl, &card->controls, list)
  		if (!strncmp(kctl->id.name, name, sizeof(kctl->id.name)))
  			return kctl;
  	return NULL;
  }
  EXPORT_SYMBOL_GPL(snd_soc_card_get_kcontrol);
  
  /**
   * snd_soc_add_component_controls - Add an array of controls to a component.
   *
   * @component: Component to add controls to
   * @controls: Array of controls to add
   * @num_controls: Number of elements in the array
   *
   * Return: 0 for success, else error.
   */
  int snd_soc_add_component_controls(struct snd_soc_component *component,
  	const struct snd_kcontrol_new *controls, unsigned int num_controls)
  {
  	struct snd_card *card = component->card->snd_card;
  
  	return snd_soc_add_controls(card, component->dev, controls,
  			num_controls, component->name_prefix, component);
  }
  EXPORT_SYMBOL_GPL(snd_soc_add_component_controls);
  
  /**
   * snd_soc_add_card_controls - add an array of controls to a SoC card.
   * Convenience function to add a list of controls.
   *
   * @soc_card: SoC card to add controls to
   * @controls: array of controls to add
   * @num_controls: number of elements in the array
   *
   * Return 0 for success, else error.
   */
  int snd_soc_add_card_controls(struct snd_soc_card *soc_card,
  	const struct snd_kcontrol_new *controls, int num_controls)
  {
  	struct snd_card *card = soc_card->snd_card;
  
  	return snd_soc_add_controls(card, soc_card->dev, controls, num_controls,
  			NULL, soc_card);
  }
  EXPORT_SYMBOL_GPL(snd_soc_add_card_controls);
  
  /**
   * snd_soc_add_dai_controls - add an array of controls to a DAI.
   * Convienience function to add a list of controls.
   *
   * @dai: DAI to add controls to
   * @controls: array of controls to add
   * @num_controls: number of elements in the array
   *
   * Return 0 for success, else error.
   */
  int snd_soc_add_dai_controls(struct snd_soc_dai *dai,
  	const struct snd_kcontrol_new *controls, int num_controls)
  {
  	struct snd_card *card = dai->component->card->snd_card;
  
  	return snd_soc_add_controls(card, dai->dev, controls, num_controls,
  			NULL, dai);
  }
  EXPORT_SYMBOL_GPL(snd_soc_add_dai_controls);
  
  /**
   * snd_soc_dai_set_sysclk - configure DAI system or master clock.
   * @dai: DAI
   * @clk_id: DAI specific clock ID
   * @freq: new clock frequency in Hz
   * @dir: new clock direction - input/output.
   *
   * Configures the DAI master (MCLK) or system (SYSCLK) clocking.
   */
  int snd_soc_dai_set_sysclk(struct snd_soc_dai *dai, int clk_id,
  	unsigned int freq, int dir)
  {
  	if (dai->driver->ops->set_sysclk)
  		return dai->driver->ops->set_sysclk(dai, clk_id, freq, dir);
  
  	return snd_soc_component_set_sysclk(dai->component, clk_id, 0,
  					    freq, dir);
  }
  EXPORT_SYMBOL_GPL(snd_soc_dai_set_sysclk);
  
  /**
   * snd_soc_component_set_sysclk - configure COMPONENT system or master clock.
   * @component: COMPONENT
   * @clk_id: DAI specific clock ID
   * @source: Source for the clock
   * @freq: new clock frequency in Hz
   * @dir: new clock direction - input/output.
   *
   * Configures the CODEC master (MCLK) or system (SYSCLK) clocking.
   */
  int snd_soc_component_set_sysclk(struct snd_soc_component *component,
  				 int clk_id, int source, unsigned int freq,
  				 int dir)
  {
  	if (component->driver->set_sysclk)
  		return component->driver->set_sysclk(component, clk_id, source,
  						 freq, dir);
  
  	return -ENOTSUPP;
  }
  EXPORT_SYMBOL_GPL(snd_soc_component_set_sysclk);
  
  /**
   * snd_soc_dai_set_clkdiv - configure DAI clock dividers.
   * @dai: DAI
   * @div_id: DAI specific clock divider ID
   * @div: new clock divisor.
   *
   * Configures the clock dividers. This is used to derive the best DAI bit and
   * frame clocks from the system or master clock. It's best to set the DAI bit
   * and frame clocks as low as possible to save system power.
   */
  int snd_soc_dai_set_clkdiv(struct snd_soc_dai *dai,
  	int div_id, int div)
  {
  	if (dai->driver->ops->set_clkdiv)
  		return dai->driver->ops->set_clkdiv(dai, div_id, div);
  	else
  		return -EINVAL;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dai_set_clkdiv);
  
  /**
   * snd_soc_dai_set_pll - configure DAI PLL.
   * @dai: DAI
   * @pll_id: DAI specific PLL ID
   * @source: DAI specific source for the PLL
   * @freq_in: PLL input clock frequency in Hz
   * @freq_out: requested PLL output clock frequency in Hz
   *
   * Configures and enables PLL to generate output clock based on input clock.
   */
  int snd_soc_dai_set_pll(struct snd_soc_dai *dai, int pll_id, int source,
  	unsigned int freq_in, unsigned int freq_out)
  {
  	if (dai->driver->ops->set_pll)
  		return dai->driver->ops->set_pll(dai, pll_id, source,
  					 freq_in, freq_out);
  
  	return snd_soc_component_set_pll(dai->component, pll_id, source,
  					 freq_in, freq_out);
  }
  EXPORT_SYMBOL_GPL(snd_soc_dai_set_pll);
  
  /*
   * snd_soc_component_set_pll - configure component PLL.
   * @component: COMPONENT
   * @pll_id: DAI specific PLL ID
   * @source: DAI specific source for the PLL
   * @freq_in: PLL input clock frequency in Hz
   * @freq_out: requested PLL output clock frequency in Hz
   *
   * Configures and enables PLL to generate output clock based on input clock.
   */
  int snd_soc_component_set_pll(struct snd_soc_component *component, int pll_id,
  			      int source, unsigned int freq_in,
  			      unsigned int freq_out)
  {
  	if (component->driver->set_pll)
  		return component->driver->set_pll(component, pll_id, source,
  						  freq_in, freq_out);
  
  	return -EINVAL;
  }
  EXPORT_SYMBOL_GPL(snd_soc_component_set_pll);
  
  /**
   * snd_soc_dai_set_bclk_ratio - configure BCLK to sample rate ratio.
   * @dai: DAI
   * @ratio: Ratio of BCLK to Sample rate.
   *
   * Configures the DAI for a preset BCLK to sample rate ratio.
   */
  int snd_soc_dai_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio)
  {
  	if (dai->driver->ops->set_bclk_ratio)
  		return dai->driver->ops->set_bclk_ratio(dai, ratio);
  	else
  		return -EINVAL;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dai_set_bclk_ratio);
  
  /**
   * snd_soc_dai_set_fmt - configure DAI hardware audio format.
   * @dai: DAI
   * @fmt: SND_SOC_DAIFMT_* format value.
   *
   * Configures the DAI hardware format and clocking.
   */
  int snd_soc_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
  {
  	if (dai->driver->ops->set_fmt == NULL)
  		return -ENOTSUPP;
  	return dai->driver->ops->set_fmt(dai, fmt);
  }
  EXPORT_SYMBOL_GPL(snd_soc_dai_set_fmt);
  
  /**
   * snd_soc_xlate_tdm_slot - generate tx/rx slot mask.
   * @slots: Number of slots in use.
   * @tx_mask: bitmask representing active TX slots.
   * @rx_mask: bitmask representing active RX slots.
   *
   * Generates the TDM tx and rx slot default masks for DAI.
   */
  static int snd_soc_xlate_tdm_slot_mask(unsigned int slots,
  				       unsigned int *tx_mask,
  				       unsigned int *rx_mask)
  {
  	if (*tx_mask || *rx_mask)
  		return 0;
  
  	if (!slots)
  		return -EINVAL;
  
  	*tx_mask = (1 << slots) - 1;
  	*rx_mask = (1 << slots) - 1;
  
  	return 0;
  }
  
  /**
   * snd_soc_dai_set_tdm_slot() - Configures a DAI for TDM operation
   * @dai: The DAI to configure
   * @tx_mask: bitmask representing active TX slots.
   * @rx_mask: bitmask representing active RX slots.
   * @slots: Number of slots in use.
   * @slot_width: Width in bits for each slot.
   *
   * This function configures the specified DAI for TDM operation. @slot contains
   * the total number of slots of the TDM stream and @slot_with the width of each
   * slot in bit clock cycles. @tx_mask and @rx_mask are bitmasks specifying the
   * active slots of the TDM stream for the specified DAI, i.e. which slots the
   * DAI should write to or read from. If a bit is set the corresponding slot is
   * active, if a bit is cleared the corresponding slot is inactive. Bit 0 maps to
   * the first slot, bit 1 to the second slot and so on. The first active slot
   * maps to the first channel of the DAI, the second active slot to the second
   * channel and so on.
   *
   * TDM mode can be disabled by passing 0 for @slots. In this case @tx_mask,
   * @rx_mask and @slot_width will be ignored.
   *
   * Returns 0 on success, a negative error code otherwise.
   */
  int snd_soc_dai_set_tdm_slot(struct snd_soc_dai *dai,
  	unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width)
  {
  	if (dai->driver->ops->xlate_tdm_slot_mask)
  		dai->driver->ops->xlate_tdm_slot_mask(slots,
  						&tx_mask, &rx_mask);
  	else
  		snd_soc_xlate_tdm_slot_mask(slots, &tx_mask, &rx_mask);
  
  	dai->tx_mask = tx_mask;
  	dai->rx_mask = rx_mask;
  
  	if (dai->driver->ops->set_tdm_slot)
  		return dai->driver->ops->set_tdm_slot(dai, tx_mask, rx_mask,
  				slots, slot_width);
  	else
  		return -ENOTSUPP;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dai_set_tdm_slot);
  
  /**
   * snd_soc_dai_set_channel_map - configure DAI audio channel map
   * @dai: DAI
   * @tx_num: how many TX channels
   * @tx_slot: pointer to an array which imply the TX slot number channel
   *           0~num-1 uses
   * @rx_num: how many RX channels
   * @rx_slot: pointer to an array which imply the RX slot number channel
   *           0~num-1 uses
   *
   * configure the relationship between channel number and TDM slot number.
   */
  int snd_soc_dai_set_channel_map(struct snd_soc_dai *dai,
  	unsigned int tx_num, unsigned int *tx_slot,
  	unsigned int rx_num, unsigned int *rx_slot)
  {
  	if (dai->driver->ops->set_channel_map)
  		return dai->driver->ops->set_channel_map(dai, tx_num, tx_slot,
  			rx_num, rx_slot);
  	else
  		return -ENOTSUPP;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dai_set_channel_map);
  
  /**
   * snd_soc_dai_get_channel_map - Get DAI audio channel map
   * @dai: DAI
   * @tx_num: how many TX channels
   * @tx_slot: pointer to an array which imply the TX slot number channel
   *           0~num-1 uses
   * @rx_num: how many RX channels
   * @rx_slot: pointer to an array which imply the RX slot number channel
   *           0~num-1 uses
   */
  int snd_soc_dai_get_channel_map(struct snd_soc_dai *dai,
  	unsigned int *tx_num, unsigned int *tx_slot,
  	unsigned int *rx_num, unsigned int *rx_slot)
  {
  	if (dai->driver->ops->get_channel_map)
  		return dai->driver->ops->get_channel_map(dai, tx_num, tx_slot,
  			rx_num, rx_slot);
  	else
  		return -ENOTSUPP;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dai_get_channel_map);
  
  /**
   * snd_soc_dai_set_tristate - configure DAI system or master clock.
   * @dai: DAI
   * @tristate: tristate enable
   *
   * Tristates the DAI so that others can use it.
   */
  int snd_soc_dai_set_tristate(struct snd_soc_dai *dai, int tristate)
  {
  	if (dai->driver->ops->set_tristate)
  		return dai->driver->ops->set_tristate(dai, tristate);
  	else
  		return -EINVAL;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dai_set_tristate);
  
  /**
   * snd_soc_dai_digital_mute - configure DAI system or master clock.
   * @dai: DAI
   * @mute: mute enable
   * @direction: stream to mute
   *
   * Mutes the DAI DAC.
   */
  int snd_soc_dai_digital_mute(struct snd_soc_dai *dai, int mute,
  			     int direction)
  {
  	if (dai->driver->ops->mute_stream)
  		return dai->driver->ops->mute_stream(dai, mute, direction);
  	else if (direction == SNDRV_PCM_STREAM_PLAYBACK &&
  		 dai->driver->ops->digital_mute)
  		return dai->driver->ops->digital_mute(dai, mute);
  	else
  		return -ENOTSUPP;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dai_digital_mute);
  
  static int snd_soc_bind_card(struct snd_soc_card *card)
  {
  	struct snd_soc_pcm_runtime *rtd;
  	int ret;
  
  	ret = snd_soc_instantiate_card(card);
  	if (ret != 0)
  		return ret;
  
  	/* deactivate pins to sleep state */
  	for_each_card_rtds(card, rtd) {
  		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  		struct snd_soc_dai *codec_dai;
  		int j;
  
  		for_each_rtd_codec_dai(rtd, j, codec_dai) {
  			if (!codec_dai->active)
  				pinctrl_pm_select_sleep_state(codec_dai->dev);
  		}
  
  		if (!cpu_dai->active)
  			pinctrl_pm_select_sleep_state(cpu_dai->dev);
  	}
  
  	return ret;
  }
  
  /**
   * snd_soc_register_card - Register a card with the ASoC core
   *
   * @card: Card to register
   *
   */
  int snd_soc_register_card(struct snd_soc_card *card)
  {
  	if (!card->name || !card->dev)
  		return -EINVAL;
  
  	dev_set_drvdata(card->dev, card);
  
  	snd_soc_initialize_card_lists(card);
  
  	INIT_LIST_HEAD(&card->dai_link_list);
  
  	INIT_LIST_HEAD(&card->rtd_list);
  	card->num_rtd = 0;
  
  	INIT_LIST_HEAD(&card->dapm_dirty);
  	INIT_LIST_HEAD(&card->dobj_list);
  	card->instantiated = 0;
  	mutex_init(&card->mutex);
  	mutex_init(&card->dapm_mutex);
  	spin_lock_init(&card->dpcm_lock);
  
  	return snd_soc_bind_card(card);
  }
  EXPORT_SYMBOL_GPL(snd_soc_register_card);
  
  static void snd_soc_unbind_card(struct snd_soc_card *card, bool unregister)
  {
  	struct snd_soc_pcm_runtime *rtd;
  	int order;
  
  	if (card->instantiated) {
  		card->instantiated = false;
  		snd_soc_dapm_shutdown(card);
  		snd_soc_flush_all_delayed_work(card);
  
  		/* remove all components used by DAI links on this card */
  		for_each_comp_order(order) {
  			for_each_card_rtds(card, rtd) {
  				soc_remove_link_components(card, rtd, order);
  			}
  		}
  
  		soc_cleanup_card_resources(card);
  		if (!unregister)
  			list_add(&card->list, &unbind_card_list);
  	} else {
  		if (unregister)
  			list_del(&card->list);
  	}
  }
  
  /**
   * snd_soc_unregister_card - Unregister a card with the ASoC core
   *
   * @card: Card to unregister
   *
   */
  int snd_soc_unregister_card(struct snd_soc_card *card)
  {
  	mutex_lock(&client_mutex);
  	snd_soc_unbind_card(card, true);
  	mutex_unlock(&client_mutex);
  	dev_dbg(card->dev, "ASoC: Unregistered card '%s'\n", card->name);
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_unregister_card);
  
  /*
   * Simplify DAI link configuration by removing ".-1" from device names
   * and sanitizing names.
   */
  static char *fmt_single_name(struct device *dev, int *id)
  {
  	char *found, name[NAME_SIZE];
  	int id1, id2;
  
  	if (dev_name(dev) == NULL)
  		return NULL;
  
  	strlcpy(name, dev_name(dev), NAME_SIZE);
  
  	/* are we a "%s.%d" name (platform and SPI components) */
  	found = strstr(name, dev->driver->name);
  	if (found) {
  		/* get ID */
  		if (sscanf(&found[strlen(dev->driver->name)], ".%d", id) == 1) {
  
  			/* discard ID from name if ID == -1 */
  			if (*id == -1)
  				found[strlen(dev->driver->name)] = '\0';
  		}
  
  	} else {
  		/* I2C component devices are named "bus-addr" */
  		if (sscanf(name, "%x-%x", &id1, &id2) == 2) {
  			char tmp[NAME_SIZE];
  
  			/* create unique ID number from I2C addr and bus */
  			*id = ((id1 & 0xffff) << 16) + id2;
  
  			/* sanitize component name for DAI link creation */
  			snprintf(tmp, NAME_SIZE, "%s.%s", dev->driver->name,
  				 name);
  			strlcpy(name, tmp, NAME_SIZE);
  		} else
  			*id = 0;
  	}
  
  	return kstrdup(name, GFP_KERNEL);
  }
  
  /*
   * Simplify DAI link naming for single devices with multiple DAIs by removing
   * any ".-1" and using the DAI name (instead of device name).
   */
  static inline char *fmt_multiple_name(struct device *dev,
  		struct snd_soc_dai_driver *dai_drv)
  {
  	if (dai_drv->name == NULL) {
  		dev_err(dev,
  			"ASoC: error - multiple DAI %s registered with no name\n",
  			dev_name(dev));
  		return NULL;
  	}
  
  	return kstrdup(dai_drv->name, GFP_KERNEL);
  }
  
  /**
   * snd_soc_unregister_dai - Unregister DAIs from the ASoC core
   *
   * @component: The component for which the DAIs should be unregistered
   */
  static void snd_soc_unregister_dais(struct snd_soc_component *component)
  {
  	struct snd_soc_dai *dai, *_dai;
  
  	for_each_component_dais_safe(component, dai, _dai) {
  		dev_dbg(component->dev, "ASoC: Unregistered DAI '%s'\n",
  			dai->name);
  		list_del(&dai->list);
  		kfree(dai->name);
  		kfree(dai);
  	}
  }
  
  /* Create a DAI and add it to the component's DAI list */
  static struct snd_soc_dai *soc_add_dai(struct snd_soc_component *component,
  	struct snd_soc_dai_driver *dai_drv,
  	bool legacy_dai_naming)
  {
  	struct device *dev = component->dev;
  	struct snd_soc_dai *dai;
  
  	dev_dbg(dev, "ASoC: dynamically register DAI %s\n", dev_name(dev));
  
  	dai = kzalloc(sizeof(struct snd_soc_dai), GFP_KERNEL);
  	if (dai == NULL)
  		return NULL;
  
  	/*
  	 * Back in the old days when we still had component-less DAIs,
  	 * instead of having a static name, component-less DAIs would
  	 * inherit the name of the parent device so it is possible to
  	 * register multiple instances of the DAI. We still need to keep
  	 * the same naming style even though those DAIs are not
  	 * component-less anymore.
  	 */
  	if (legacy_dai_naming &&
  	    (dai_drv->id == 0 || dai_drv->name == NULL)) {
  		dai->name = fmt_single_name(dev, &dai->id);
  	} else {
  		dai->name = fmt_multiple_name(dev, dai_drv);
  		if (dai_drv->id)
  			dai->id = dai_drv->id;
  		else
  			dai->id = component->num_dai;
  	}
  	if (dai->name == NULL) {
  		kfree(dai);
  		return NULL;
  	}
  
  	dai->component = component;
  	dai->dev = dev;
  	dai->driver = dai_drv;
  	if (!dai->driver->ops)
  		dai->driver->ops = &null_dai_ops;
  
  	/* see for_each_component_dais */
  	list_add_tail(&dai->list, &component->dai_list);
  	component->num_dai++;
  
  	dev_dbg(dev, "ASoC: Registered DAI '%s'\n", dai->name);
  	return dai;
  }
  
  /**
   * snd_soc_register_dais - Register a DAI with the ASoC core
   *
   * @component: The component the DAIs are registered for
   * @dai_drv: DAI driver to use for the DAIs
   * @count: Number of DAIs
   */
  static int snd_soc_register_dais(struct snd_soc_component *component,
  				 struct snd_soc_dai_driver *dai_drv,
  				 size_t count)
  {
  	struct device *dev = component->dev;
  	struct snd_soc_dai *dai;
  	unsigned int i;
  	int ret;
  
  	dev_dbg(dev, "ASoC: dai register %s #%zu\n", dev_name(dev), count);
  
  	for (i = 0; i < count; i++) {
  
  		dai = soc_add_dai(component, dai_drv + i, count == 1 &&
  				  !component->driver->non_legacy_dai_naming);
  		if (dai == NULL) {
  			ret = -ENOMEM;
  			goto err;
  		}
  	}
  
  	return 0;
  
  err:
  	snd_soc_unregister_dais(component);
  
  	return ret;
  }
  
  /**
   * snd_soc_register_dai - Register a DAI dynamically & create its widgets
   *
   * @component: The component the DAIs are registered for
   * @dai_drv: DAI driver to use for the DAI
   *
   * Topology can use this API to register DAIs when probing a component.
   * These DAIs's widgets will be freed in the card cleanup and the DAIs
   * will be freed in the component cleanup.
   */
  int snd_soc_register_dai(struct snd_soc_component *component,
  	struct snd_soc_dai_driver *dai_drv)
  {
  	struct snd_soc_dapm_context *dapm =
  		snd_soc_component_get_dapm(component);
  	struct snd_soc_dai *dai;
  	int ret;
  
  	if (dai_drv->dobj.type != SND_SOC_DOBJ_PCM) {
  		dev_err(component->dev, "Invalid dai type %d\n",
  			dai_drv->dobj.type);
  		return -EINVAL;
  	}
  
  	lockdep_assert_held(&client_mutex);
  	dai = soc_add_dai(component, dai_drv, false);
  	if (!dai)
  		return -ENOMEM;
  
  	/*
  	 * Create the DAI widgets here. After adding DAIs, topology may
  	 * also add routes that need these widgets as source or sink.
  	 */
  	ret = snd_soc_dapm_new_dai_widgets(dapm, dai);
  	if (ret != 0) {
  		dev_err(component->dev,
  			"Failed to create DAI widgets %d\n", ret);
  	}
  
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_register_dai);
  
  static void snd_soc_component_seq_notifier(struct snd_soc_dapm_context *dapm,
  	enum snd_soc_dapm_type type, int subseq)
  {
  	struct snd_soc_component *component = dapm->component;
  
  	component->driver->seq_notifier(component, type, subseq);
  }
  
  static int snd_soc_component_stream_event(struct snd_soc_dapm_context *dapm,
  	int event)
  {
  	struct snd_soc_component *component = dapm->component;
  
  	return component->driver->stream_event(component, event);
  }
  
  static int snd_soc_component_set_bias_level(struct snd_soc_dapm_context *dapm,
  					enum snd_soc_bias_level level)
  {
  	struct snd_soc_component *component = dapm->component;
  
  	return component->driver->set_bias_level(component, level);
  }
  
  static int snd_soc_component_initialize(struct snd_soc_component *component,
  	const struct snd_soc_component_driver *driver, struct device *dev)
  {
  	struct snd_soc_dapm_context *dapm;
  
  	component->name = fmt_single_name(dev, &component->id);
  	if (!component->name) {
  		dev_err(dev, "ASoC: Failed to allocate name\n");
  		return -ENOMEM;
  	}
  
  	component->dev = dev;
  	component->driver = driver;
  
  	dapm = snd_soc_component_get_dapm(component);
  	dapm->dev = dev;
  	dapm->component = component;
  	dapm->bias_level = SND_SOC_BIAS_OFF;
  	dapm->idle_bias_off = !driver->idle_bias_on;
  	dapm->suspend_bias_off = driver->suspend_bias_off;
  	if (driver->seq_notifier)
  		dapm->seq_notifier = snd_soc_component_seq_notifier;
  	if (driver->stream_event)
  		dapm->stream_event = snd_soc_component_stream_event;
  	if (driver->set_bias_level)
  		dapm->set_bias_level = snd_soc_component_set_bias_level;
  
  	INIT_LIST_HEAD(&component->dai_list);
  	mutex_init(&component->io_mutex);
  
  	return 0;
  }
  
  static void snd_soc_component_setup_regmap(struct snd_soc_component *component)
  {
  	int val_bytes = regmap_get_val_bytes(component->regmap);
  
  	/* Errors are legitimate for non-integer byte multiples */
  	if (val_bytes > 0)
  		component->val_bytes = val_bytes;
  }
  
  #ifdef CONFIG_REGMAP
  
  /**
   * snd_soc_component_init_regmap() - Initialize regmap instance for the
   *                                   component
   * @component: The component for which to initialize the regmap instance
   * @regmap: The regmap instance that should be used by the component
   *
   * This function allows deferred assignment of the regmap instance that is
   * associated with the component. Only use this if the regmap instance is not
   * yet ready when the component is registered. The function must also be called
   * before the first IO attempt of the component.
   */
  void snd_soc_component_init_regmap(struct snd_soc_component *component,
  	struct regmap *regmap)
  {
  	component->regmap = regmap;
  	snd_soc_component_setup_regmap(component);
  }
  EXPORT_SYMBOL_GPL(snd_soc_component_init_regmap);
  
  /**
   * snd_soc_component_exit_regmap() - De-initialize regmap instance for the
   *                                   component
   * @component: The component for which to de-initialize the regmap instance
   *
   * Calls regmap_exit() on the regmap instance associated to the component and
   * removes the regmap instance from the component.
   *
   * This function should only be used if snd_soc_component_init_regmap() was used
   * to initialize the regmap instance.
   */
  void snd_soc_component_exit_regmap(struct snd_soc_component *component)
  {
  	regmap_exit(component->regmap);
  	component->regmap = NULL;
  }
  EXPORT_SYMBOL_GPL(snd_soc_component_exit_regmap);
  
  #endif
  
  static void snd_soc_component_add(struct snd_soc_component *component)
  {
  	mutex_lock(&client_mutex);
  
  	if (!component->driver->write && !component->driver->read) {
  		if (!component->regmap)
  			component->regmap = dev_get_regmap(component->dev,
  							   NULL);
  		if (component->regmap)
  			snd_soc_component_setup_regmap(component);
  	}
  
  	/* see for_each_component */
  	list_add(&component->list, &component_list);
  	INIT_LIST_HEAD(&component->dobj_list);
  
  	mutex_unlock(&client_mutex);
  }
  
  static void snd_soc_component_cleanup(struct snd_soc_component *component)
  {
  	snd_soc_unregister_dais(component);
  	kfree(component->name);
  }
  
  static void snd_soc_component_del_unlocked(struct snd_soc_component *component)
  {
  	struct snd_soc_card *card = component->card;
  
  	if (card)
  		snd_soc_unbind_card(card, false);
  
  	list_del(&component->list);
  }
  
  #define ENDIANNESS_MAP(name) \
  	(SNDRV_PCM_FMTBIT_##name##LE | SNDRV_PCM_FMTBIT_##name##BE)
  static u64 endianness_format_map[] = {
  	ENDIANNESS_MAP(S16_),
  	ENDIANNESS_MAP(U16_),
  	ENDIANNESS_MAP(S24_),
  	ENDIANNESS_MAP(U24_),
  	ENDIANNESS_MAP(S32_),
  	ENDIANNESS_MAP(U32_),
  	ENDIANNESS_MAP(S24_3),
  	ENDIANNESS_MAP(U24_3),
  	ENDIANNESS_MAP(S20_3),
  	ENDIANNESS_MAP(U20_3),
  	ENDIANNESS_MAP(S18_3),
  	ENDIANNESS_MAP(U18_3),
  	ENDIANNESS_MAP(FLOAT_),
  	ENDIANNESS_MAP(FLOAT64_),
  	ENDIANNESS_MAP(IEC958_SUBFRAME_),
  };
  
  /*
   * Fix up the DAI formats for endianness: codecs don't actually see
   * the endianness of the data but we're using the CPU format
   * definitions which do need to include endianness so we ensure that
   * codec DAIs always have both big and little endian variants set.
   */
  static void convert_endianness_formats(struct snd_soc_pcm_stream *stream)
  {
  	int i;
  
  	for (i = 0; i < ARRAY_SIZE(endianness_format_map); i++)
  		if (stream->formats & endianness_format_map[i])
  			stream->formats |= endianness_format_map[i];
  }
  
  static void snd_soc_try_rebind_card(void)
  {
  	struct snd_soc_card *card, *c;
  
  	if (!list_empty(&unbind_card_list)) {
  		list_for_each_entry_safe(card, c, &unbind_card_list, list) {
  			if (!snd_soc_bind_card(card))
  				list_del(&card->list);
  		}
  	}
  }
  
  int snd_soc_add_component(struct device *dev,
  			struct snd_soc_component *component,
  			const struct snd_soc_component_driver *component_driver,
  			struct snd_soc_dai_driver *dai_drv,
  			int num_dai)
  {
  	int ret;
  	int i;
  
  	ret = snd_soc_component_initialize(component, component_driver, dev);
  	if (ret)
  		goto err_free;
  
  	if (component_driver->endianness) {
  		for (i = 0; i < num_dai; i++) {
  			convert_endianness_formats(&dai_drv[i].playback);
  			convert_endianness_formats(&dai_drv[i].capture);
  		}
  	}
  
  	ret = snd_soc_register_dais(component, dai_drv, num_dai);
  	if (ret < 0) {
  		dev_err(dev, "ASoC: Failed to register DAIs: %d\n", ret);
  		goto err_cleanup;
  	}
  
  	snd_soc_component_add(component);
  	snd_soc_try_rebind_card();
  
  	return 0;
  
  err_cleanup:
  	snd_soc_component_cleanup(component);
  err_free:
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_add_component);
  
  int snd_soc_register_component(struct device *dev,
  			const struct snd_soc_component_driver *component_driver,
  			struct snd_soc_dai_driver *dai_drv,
  			int num_dai)
  {
  	struct snd_soc_component *component;
  
  	component = devm_kzalloc(dev, sizeof(*component), GFP_KERNEL);
  	if (!component)
  		return -ENOMEM;
  
  	return snd_soc_add_component(dev, component, component_driver,
  				     dai_drv, num_dai);
  }
  EXPORT_SYMBOL_GPL(snd_soc_register_component);
  
  /**
   * snd_soc_unregister_component - Unregister all related component
   * from the ASoC core
   *
   * @dev: The device to unregister
   */
  static int __snd_soc_unregister_component(struct device *dev)
  {
  	struct snd_soc_component *component;
  	int found = 0;
  
  	mutex_lock(&client_mutex);
  	for_each_component(component) {
  		if (dev != component->dev)
  			continue;
  
  		snd_soc_tplg_component_remove(component,
  					      SND_SOC_TPLG_INDEX_ALL);
  		snd_soc_component_del_unlocked(component);
  		found = 1;
  		break;
  	}
  	mutex_unlock(&client_mutex);
  
  	if (found)
  		snd_soc_component_cleanup(component);
  
  	return found;
  }
  
  void snd_soc_unregister_component(struct device *dev)
  {
  	while (__snd_soc_unregister_component(dev))
  		;
  }
  EXPORT_SYMBOL_GPL(snd_soc_unregister_component);
  
  struct snd_soc_component *snd_soc_lookup_component(struct device *dev,
  						   const char *driver_name)
  {
  	struct snd_soc_component *component;
  	struct snd_soc_component *ret;
  
  	ret = NULL;
  	mutex_lock(&client_mutex);
  	for_each_component(component) {
  		if (dev != component->dev)
  			continue;
  
  		if (driver_name &&
  		    (driver_name != component->driver->name) &&
  		    (strcmp(component->driver->name, driver_name) != 0))
  			continue;
  
  		ret = component;
  		break;
  	}
  	mutex_unlock(&client_mutex);
  
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_lookup_component);
  
  /* Retrieve a card's name from device tree */
  int snd_soc_of_parse_card_name(struct snd_soc_card *card,
  			       const char *propname)
  {
  	struct device_node *np;
  	int ret;
  
  	if (!card->dev) {
  		pr_err("card->dev is not set before calling %s\n", __func__);
  		return -EINVAL;
  	}
  
  	np = card->dev->of_node;
  
  	ret = of_property_read_string_index(np, propname, 0, &card->name);
  	/*
  	 * EINVAL means the property does not exist. This is fine providing
  	 * card->name was previously set, which is checked later in
  	 * snd_soc_register_card.
  	 */
  	if (ret < 0 && ret != -EINVAL) {
  		dev_err(card->dev,
  			"ASoC: Property '%s' could not be read: %d\n",
  			propname, ret);
  		return ret;
  	}
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_of_parse_card_name);
  
  static const struct snd_soc_dapm_widget simple_widgets[] = {
  	SND_SOC_DAPM_MIC("Microphone", NULL),
  	SND_SOC_DAPM_LINE("Line", NULL),
  	SND_SOC_DAPM_HP("Headphone", NULL),
  	SND_SOC_DAPM_SPK("Speaker", NULL),
  };
  
  int snd_soc_of_parse_audio_simple_widgets(struct snd_soc_card *card,
  					  const char *propname)
  {
  	struct device_node *np = card->dev->of_node;
  	struct snd_soc_dapm_widget *widgets;
  	const char *template, *wname;
  	int i, j, num_widgets, ret;
  
  	num_widgets = of_property_count_strings(np, propname);
  	if (num_widgets < 0) {
  		dev_err(card->dev,
  			"ASoC: Property '%s' does not exist\n",	propname);
  		return -EINVAL;
  	}
  	if (num_widgets & 1) {
  		dev_err(card->dev,
  			"ASoC: Property '%s' length is not even\n", propname);
  		return -EINVAL;
  	}
  
  	num_widgets /= 2;
  	if (!num_widgets) {
  		dev_err(card->dev, "ASoC: Property '%s's length is zero\n",
  			propname);
  		return -EINVAL;
  	}
  
  	widgets = devm_kcalloc(card->dev, num_widgets, sizeof(*widgets),
  			       GFP_KERNEL);
  	if (!widgets) {
  		dev_err(card->dev,
  			"ASoC: Could not allocate memory for widgets\n");
  		return -ENOMEM;
  	}
  
  	for (i = 0; i < num_widgets; i++) {
  		ret = of_property_read_string_index(np, propname,
  			2 * i, &template);
  		if (ret) {
  			dev_err(card->dev,
  				"ASoC: Property '%s' index %d read error:%d\n",
  				propname, 2 * i, ret);
  			return -EINVAL;
  		}
  
  		for (j = 0; j < ARRAY_SIZE(simple_widgets); j++) {
  			if (!strncmp(template, simple_widgets[j].name,
  				     strlen(simple_widgets[j].name))) {
  				widgets[i] = simple_widgets[j];
  				break;
  			}
  		}
  
  		if (j >= ARRAY_SIZE(simple_widgets)) {
  			dev_err(card->dev,
  				"ASoC: DAPM widget '%s' is not supported\n",
  				template);
  			return -EINVAL;
  		}
  
  		ret = of_property_read_string_index(np, propname,
  						    (2 * i) + 1,
  						    &wname);
  		if (ret) {
  			dev_err(card->dev,
  				"ASoC: Property '%s' index %d read error:%d\n",
  				propname, (2 * i) + 1, ret);
  			return -EINVAL;
  		}
  
  		widgets[i].name = wname;
  	}
  
  	card->of_dapm_widgets = widgets;
  	card->num_of_dapm_widgets = num_widgets;
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_simple_widgets);
  
  int snd_soc_of_get_slot_mask(struct device_node *np,
  			     const char *prop_name,
  			     unsigned int *mask)
  {
  	u32 val;
  	const __be32 *of_slot_mask = of_get_property(np, prop_name, &val);
  	int i;
  
  	if (!of_slot_mask)
  		return 0;
  	val /= sizeof(u32);
  	for (i = 0; i < val; i++)
  		if (be32_to_cpup(&of_slot_mask[i]))
  			*mask |= (1 << i);
  
  	return val;
  }
  EXPORT_SYMBOL_GPL(snd_soc_of_get_slot_mask);
  
  int snd_soc_of_parse_tdm_slot(struct device_node *np,
  			      unsigned int *tx_mask,
  			      unsigned int *rx_mask,
  			      unsigned int *slots,
  			      unsigned int *slot_width)
  {
  	u32 val;
  	int ret;
  
  	if (tx_mask)
  		snd_soc_of_get_slot_mask(np, "dai-tdm-slot-tx-mask", tx_mask);
  	if (rx_mask)
  		snd_soc_of_get_slot_mask(np, "dai-tdm-slot-rx-mask", rx_mask);
  
  	if (of_property_read_bool(np, "dai-tdm-slot-num")) {
  		ret = of_property_read_u32(np, "dai-tdm-slot-num", &val);
  		if (ret)
  			return ret;
  
  		if (slots)
  			*slots = val;
  	}
  
  	if (of_property_read_bool(np, "dai-tdm-slot-width")) {
  		ret = of_property_read_u32(np, "dai-tdm-slot-width", &val);
  		if (ret)
  			return ret;
  
  		if (slot_width)
  			*slot_width = val;
  	}
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_of_parse_tdm_slot);
  
  void snd_soc_of_parse_node_prefix(struct device_node *np,
  				  struct snd_soc_codec_conf *codec_conf,
  				  struct device_node *of_node,
  				  const char *propname)
  {
  	const char *str;
  	int ret;
  
  	ret = of_property_read_string(np, propname, &str);
  	if (ret < 0) {
  		/* no prefix is not error */
  		return;
  	}
  
  	codec_conf->of_node	= of_node;
  	codec_conf->name_prefix	= str;
  }
  EXPORT_SYMBOL_GPL(snd_soc_of_parse_node_prefix);
  
  int snd_soc_of_parse_audio_routing(struct snd_soc_card *card,
  				   const char *propname)
  {
  	struct device_node *np = card->dev->of_node;
  	int num_routes;
  	struct snd_soc_dapm_route *routes;
  	int i, ret;
  
  	num_routes = of_property_count_strings(np, propname);
  	if (num_routes < 0 || num_routes & 1) {
  		dev_err(card->dev,
  			"ASoC: Property '%s' does not exist or its length is not even\n",
  			propname);
  		return -EINVAL;
  	}
  	num_routes /= 2;
  	if (!num_routes) {
  		dev_err(card->dev, "ASoC: Property '%s's length is zero\n",
  			propname);
  		return -EINVAL;
  	}
  
  	routes = devm_kcalloc(card->dev, num_routes, sizeof(*routes),
  			      GFP_KERNEL);
  	if (!routes) {
  		dev_err(card->dev,
  			"ASoC: Could not allocate DAPM route table\n");
  		return -EINVAL;
  	}
  
  	for (i = 0; i < num_routes; i++) {
  		ret = of_property_read_string_index(np, propname,
  			2 * i, &routes[i].sink);
  		if (ret) {
  			dev_err(card->dev,
  				"ASoC: Property '%s' index %d could not be read: %d\n",
  				propname, 2 * i, ret);
  			return -EINVAL;
  		}
  		ret = of_property_read_string_index(np, propname,
  			(2 * i) + 1, &routes[i].source);
  		if (ret) {
  			dev_err(card->dev,
  				"ASoC: Property '%s' index %d could not be read: %d\n",
  				propname, (2 * i) + 1, ret);
  			return -EINVAL;
  		}
  	}
  
  	card->num_of_dapm_routes = num_routes;
  	card->of_dapm_routes = routes;
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_routing);
  
  unsigned int snd_soc_of_parse_daifmt(struct device_node *np,
  				     const char *prefix,
  				     struct device_node **bitclkmaster,
  				     struct device_node **framemaster)
  {
  	int ret, i;
  	char prop[128];
  	unsigned int format = 0;
  	int bit, frame;
  	const char *str;
  	struct {
  		char *name;
  		unsigned int val;
  	} of_fmt_table[] = {
  		{ "i2s",	SND_SOC_DAIFMT_I2S },
  		{ "right_j",	SND_SOC_DAIFMT_RIGHT_J },
  		{ "left_j",	SND_SOC_DAIFMT_LEFT_J },
  		{ "dsp_a",	SND_SOC_DAIFMT_DSP_A },
  		{ "dsp_b",	SND_SOC_DAIFMT_DSP_B },
  		{ "ac97",	SND_SOC_DAIFMT_AC97 },
  		{ "pdm",	SND_SOC_DAIFMT_PDM},
  		{ "msb",	SND_SOC_DAIFMT_MSB },
  		{ "lsb",	SND_SOC_DAIFMT_LSB },
  	};
  
  	if (!prefix)
  		prefix = "";
  
  	/*
  	 * check "dai-format = xxx"
  	 * or    "[prefix]format = xxx"
  	 * SND_SOC_DAIFMT_FORMAT_MASK area
  	 */
  	ret = of_property_read_string(np, "dai-format", &str);
  	if (ret < 0) {
  		snprintf(prop, sizeof(prop), "%sformat", prefix);
  		ret = of_property_read_string(np, prop, &str);
  	}
  	if (ret == 0) {
  		for (i = 0; i < ARRAY_SIZE(of_fmt_table); i++) {
  			if (strcmp(str, of_fmt_table[i].name) == 0) {
  				format |= of_fmt_table[i].val;
  				break;
  			}
  		}
  	}
  
  	/*
  	 * check "[prefix]continuous-clock"
  	 * SND_SOC_DAIFMT_CLOCK_MASK area
  	 */
  	snprintf(prop, sizeof(prop), "%scontinuous-clock", prefix);
  	if (of_property_read_bool(np, prop))
  		format |= SND_SOC_DAIFMT_CONT;
  	else
  		format |= SND_SOC_DAIFMT_GATED;
  
  	/*
  	 * check "[prefix]bitclock-inversion"
  	 * check "[prefix]frame-inversion"
  	 * SND_SOC_DAIFMT_INV_MASK area
  	 */
  	snprintf(prop, sizeof(prop), "%sbitclock-inversion", prefix);
  	bit = !!of_get_property(np, prop, NULL);
  
  	snprintf(prop, sizeof(prop), "%sframe-inversion", prefix);
  	frame = !!of_get_property(np, prop, NULL);
  
  	switch ((bit << 4) + frame) {
  	case 0x11:
  		format |= SND_SOC_DAIFMT_IB_IF;
  		break;
  	case 0x10:
  		format |= SND_SOC_DAIFMT_IB_NF;
  		break;
  	case 0x01:
  		format |= SND_SOC_DAIFMT_NB_IF;
  		break;
  	default:
  		/* SND_SOC_DAIFMT_NB_NF is default */
  		break;
  	}
  
  	/*
  	 * check "[prefix]bitclock-master"
  	 * check "[prefix]frame-master"
  	 * SND_SOC_DAIFMT_MASTER_MASK area
  	 */
  	snprintf(prop, sizeof(prop), "%sbitclock-master", prefix);
  	bit = !!of_get_property(np, prop, NULL);
  	if (bit && bitclkmaster)
  		*bitclkmaster = of_parse_phandle(np, prop, 0);
  
  	snprintf(prop, sizeof(prop), "%sframe-master", prefix);
  	frame = !!of_get_property(np, prop, NULL);
  	if (frame && framemaster)
  		*framemaster = of_parse_phandle(np, prop, 0);
  
  	switch ((bit << 4) + frame) {
  	case 0x11:
  		format |= SND_SOC_DAIFMT_CBM_CFM;
  		break;
  	case 0x10:
  		format |= SND_SOC_DAIFMT_CBM_CFS;
  		break;
  	case 0x01:
  		format |= SND_SOC_DAIFMT_CBS_CFM;
  		break;
  	default:
  		format |= SND_SOC_DAIFMT_CBS_CFS;
  		break;
  	}
  
  	return format;
  }
  EXPORT_SYMBOL_GPL(snd_soc_of_parse_daifmt);
  
  int snd_soc_get_dai_id(struct device_node *ep)
  {
  	struct snd_soc_component *component;
  	struct snd_soc_dai_link_component dlc;
  	int ret;
  
  	dlc.of_node	= of_graph_get_port_parent(ep);
  	dlc.name	= NULL;
  	/*
  	 * For example HDMI case, HDMI has video/sound port,
  	 * but ALSA SoC needs sound port number only.
  	 * Thus counting HDMI DT port/endpoint doesn't work.
  	 * Then, it should have .of_xlate_dai_id
  	 */
  	ret = -ENOTSUPP;
  	mutex_lock(&client_mutex);
  	component = soc_find_component(&dlc);
  	if (component &&
  	    component->driver->of_xlate_dai_id)
  		ret = component->driver->of_xlate_dai_id(component, ep);
  	mutex_unlock(&client_mutex);
  
  	of_node_put(dlc.of_node);
  
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_get_dai_id);
  
  int snd_soc_get_dai_name(struct of_phandle_args *args,
  				const char **dai_name)
  {
  	struct snd_soc_component *pos;
  	struct device_node *component_of_node;
  	int ret = -EPROBE_DEFER;
  
  	mutex_lock(&client_mutex);
  	for_each_component(pos) {
  		component_of_node = soc_component_to_node(pos);
  
  		if (component_of_node != args->np)
  			continue;
  
  		if (pos->driver->of_xlate_dai_name) {
  			ret = pos->driver->of_xlate_dai_name(pos,
  							     args,
  							     dai_name);
  		} else {
  			struct snd_soc_dai *dai;
  			int id = -1;
  
  			switch (args->args_count) {
  			case 0:
  				id = 0; /* same as dai_drv[0] */
  				break;
  			case 1:
  				id = args->args[0];
  				break;
  			default:
  				/* not supported */
  				break;
  			}
  
  			if (id < 0 || id >= pos->num_dai) {
  				ret = -EINVAL;
  				continue;
  			}
  
  			ret = 0;
  
  			/* find target DAI */
  			for_each_component_dais(pos, dai) {
  				if (id == 0)
  					break;
  				id--;
  			}
  
  			*dai_name = dai->driver->name;
  			if (!*dai_name)
  				*dai_name = pos->name;
  		}
  
  		break;
  	}
  	mutex_unlock(&client_mutex);
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_get_dai_name);
  
  int snd_soc_of_get_dai_name(struct device_node *of_node,
  			    const char **dai_name)
  {
  	struct of_phandle_args args;
  	int ret;
  
  	ret = of_parse_phandle_with_args(of_node, "sound-dai",
  					 "#sound-dai-cells", 0, &args);
  	if (ret)
  		return ret;
  
  	ret = snd_soc_get_dai_name(&args, dai_name);
  
  	of_node_put(args.np);
  
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_name);
  
  /*
   * snd_soc_of_put_dai_link_codecs - Dereference device nodes in the codecs array
   * @dai_link: DAI link
   *
   * Dereference device nodes acquired by snd_soc_of_get_dai_link_codecs().
   */
  void snd_soc_of_put_dai_link_codecs(struct snd_soc_dai_link *dai_link)
  {
  	struct snd_soc_dai_link_component *component;
  	int index;
  
  	for_each_link_codecs(dai_link, index, component) {
  		if (!component->of_node)
  			break;
  		of_node_put(component->of_node);
  		component->of_node = NULL;
  	}
  }
  EXPORT_SYMBOL_GPL(snd_soc_of_put_dai_link_codecs);
  
  /*
   * snd_soc_of_get_dai_link_codecs - Parse a list of CODECs in the devicetree
   * @dev: Card device
   * @of_node: Device node
   * @dai_link: DAI link
   *
   * Builds an array of CODEC DAI components from the DAI link property
   * 'sound-dai'.
   * The array is set in the DAI link and the number of DAIs is set accordingly.
   * The device nodes in the array (of_node) must be dereferenced by calling
   * snd_soc_of_put_dai_link_codecs() on @dai_link.
   *
   * Returns 0 for success
   */
  int snd_soc_of_get_dai_link_codecs(struct device *dev,
  				   struct device_node *of_node,
  				   struct snd_soc_dai_link *dai_link)
  {
  	struct of_phandle_args args;
  	struct snd_soc_dai_link_component *component;
  	char *name;
  	int index, num_codecs, ret;
  
  	/* Count the number of CODECs */
  	name = "sound-dai";
  	num_codecs = of_count_phandle_with_args(of_node, name,
  						"#sound-dai-cells");
  	if (num_codecs <= 0) {
  		if (num_codecs == -ENOENT)
  			dev_err(dev, "No 'sound-dai' property\n");
  		else
  			dev_err(dev, "Bad phandle in 'sound-dai'\n");
  		return num_codecs;
  	}
  	component = devm_kcalloc(dev,
  				 num_codecs, sizeof(*component),
  				 GFP_KERNEL);
  	if (!component)
  		return -ENOMEM;
  	dai_link->codecs = component;
  	dai_link->num_codecs = num_codecs;
  
  	/* Parse the list */
  	for_each_link_codecs(dai_link, index, component) {
  		ret = of_parse_phandle_with_args(of_node, name,
  						 "#sound-dai-cells",
  						 index, &args);
  		if (ret)
  			goto err;
  		component->of_node = args.np;
  		ret = snd_soc_get_dai_name(&args, &component->dai_name);
  		if (ret < 0)
  			goto err;
  	}
  	return 0;
  err:
  	snd_soc_of_put_dai_link_codecs(dai_link);
  	dai_link->codecs = NULL;
  	dai_link->num_codecs = 0;
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_link_codecs);
  
  static int __init snd_soc_init(void)
  {
  	snd_soc_debugfs_init();
  	snd_soc_util_init();
  
  	return platform_driver_register(&soc_driver);
  }
  module_init(snd_soc_init);
  
  static void __exit snd_soc_exit(void)
  {
  	snd_soc_util_exit();
  	snd_soc_debugfs_exit();
  
  	platform_driver_unregister(&soc_driver);
  }
  module_exit(snd_soc_exit);
  
  /* Module information */
  MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
  MODULE_DESCRIPTION("ALSA SoC Core");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("platform:soc-audio");
  