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 // 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 <linux/acpi.h>
 #include <sound/core.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/soc-link.h>
 #include <sound/initval.h>
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/asoc.h>
 
 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)");
 
 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_store(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_RW(pmdown_time);
 
 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 (!rtd)
         return 0;
 
     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
 struct dentry *snd_soc_debugfs_root;
 EXPORT_SYMBOL_GPL(snd_soc_debugfs_root);
 
 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);
     }
 
     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)
 {
     if (!component->debugfs_root)
         return;
     debugfs_remove_recursive(component->debugfs_root);
     component->debugfs_root = NULL;
 }
 
 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)
 {
     card->debugfs_card_root = debugfs_create_dir(card->name,
                              snd_soc_debugfs_root);
 
     debugfs_create_u32("dapm_pop_time", 0644, card->debugfs_card_root,
                &card->pop_time);
 
     snd_soc_dapm_debugfs_init(&card->dapm, card->debugfs_card_root);
 }
 
 static void soc_cleanup_card_debugfs(struct snd_soc_card *card)
 {
     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);
 
     debugfs_create_file("dais", 0444, snd_soc_debugfs_root, NULL,
                 &dai_list_fops);
 
     debugfs_create_file("components", 0444, snd_soc_debugfs_root, NULL,
                 &component_list_fops);
 }
 
 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_rtd_add_component(struct snd_soc_pcm_runtime *rtd,
                      struct snd_soc_component *component)
 {
     struct snd_soc_component *comp;
     int i;
 
     for_each_rtd_components(rtd, i, comp) {
         /* already connected */
         if (comp == component)
             return 0;
     }
 
     /* see for_each_rtd_components */
     rtd->components[rtd->num_components] = component;
     rtd->num_components++;
 
     return 0;
 }
 
 struct snd_soc_component *snd_soc_rtdcom_lookup(struct snd_soc_pcm_runtime *rtd,
                         const char *driver_name)
 {
     struct snd_soc_component *component;
     int i;
 
     if (!driver_name)
         return NULL;
 
     /*
      * NOTE
      *
      * snd_soc_rtdcom_lookup() will find component from rtd by using
      * specified driver name.
      * But, if many components which have same driver name are connected
      * to 1 rtd, this function will return 1st found component.
      */
     for_each_rtd_components(rtd, i, component) {
         const char *component_name = component->driver->name;
 
         if (!component_name)
             continue;
 
         if ((component_name == driver_name) ||
             strcmp(component_name, driver_name) == 0)
             return component;
     }
 
     return NULL;
 }
 EXPORT_SYMBOL_GPL(snd_soc_rtdcom_lookup);
 
 struct snd_soc_component
 *snd_soc_lookup_component_nolocked(struct device *dev, const char *driver_name)
 {
     struct snd_soc_component *component;
     struct snd_soc_component *found_component;
 
     found_component = NULL;
     for_each_component(component) {
         if ((dev == component->dev) &&
             (!driver_name ||
              (driver_name == component->driver->name) ||
              (strcmp(component->driver->name, driver_name) == 0))) {
             found_component = component;
             break;
         }
     }
 
     return found_component;
 }
 EXPORT_SYMBOL_GPL(snd_soc_lookup_component_nolocked);
 
 struct snd_soc_component *snd_soc_lookup_component(struct device *dev,
                            const char *driver_name)
 {
     struct snd_soc_component *component;
 
     mutex_lock(&client_mutex);
     component = snd_soc_lookup_component_nolocked(dev, driver_name);
     mutex_unlock(&client_mutex);
 
     return component;
 }
 EXPORT_SYMBOL_GPL(snd_soc_lookup_component);
 
 struct snd_soc_pcm_runtime
 *snd_soc_get_pcm_runtime(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 rtd;
     }
     dev_dbg(card->dev, "ASoC: failed to find rtd %s\n", dai_link->name);
     return NULL;
 }
 EXPORT_SYMBOL_GPL(snd_soc_get_pcm_runtime);
 
 /*
  * Power down the audio subsystem pmdown_time msecs after close is called.
  * This is to ensure there are no pops or clicks in between any music tracks
  * due to DAPM power cycling.
  */
 void snd_soc_close_delayed_work(struct snd_soc_pcm_runtime *rtd)
 {
     struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
     int playback = SNDRV_PCM_STREAM_PLAYBACK;
 
     mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 
     dev_dbg(rtd->dev,
         "ASoC: pop wq checking: %s status: %s waiting: %s\n",
         codec_dai->driver->playback.stream_name,
         snd_soc_dai_stream_active(codec_dai, playback) ?
         "active" : "inactive",
         rtd->pop_wait ? "yes" : "no");
 
     /* are we waiting on this codec DAI stream */
     if (rtd->pop_wait == 1) {
         rtd->pop_wait = 0;
         snd_soc_dapm_stream_event(rtd, playback,
                       SND_SOC_DAPM_STREAM_STOP);
     }
 
     mutex_unlock(&rtd->card->pcm_mutex);
 }
 EXPORT_SYMBOL_GPL(snd_soc_close_delayed_work);
 
 static void soc_release_rtd_dev(struct device *dev)
 {
     /* "dev" means "rtd->dev" */
     kfree(dev);
 }
 
 static void soc_free_pcm_runtime(struct snd_soc_pcm_runtime *rtd)
 {
     if (!rtd)
         return;
 
     list_del(&rtd->list);
 
     if (delayed_work_pending(&rtd->delayed_work))
         flush_delayed_work(&rtd->delayed_work);
     snd_soc_pcm_component_free(rtd);
 
     /*
      * we don't need to call kfree() for rtd->dev
      * see
      *  soc_release_rtd_dev()
      *
      * We don't need rtd->dev NULL check, because
      * it is alloced *before* rtd.
      * see
      *  soc_new_pcm_runtime()
      *
      * We don't need to mind freeing for rtd,
      * because it was created from dev (= rtd->dev)
      * see
      *  soc_new_pcm_runtime()
      *
      *      rtd = devm_kzalloc(dev, ...);
      *      rtd->dev = dev
      */
     device_unregister(rtd->dev);
 }
 
 static void close_delayed_work(struct work_struct *work) {
     struct snd_soc_pcm_runtime *rtd =
             container_of(work, struct snd_soc_pcm_runtime,
                      delayed_work.work);
 
     if (rtd->close_delayed_work_func)
         rtd->close_delayed_work_func(rtd);
 }
 
 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;
     struct snd_soc_component *component;
     struct device *dev;
     int ret;
     int stream;
 
     /*
      * for rtd->dev
      */
     dev = kzalloc(sizeof(struct device), GFP_KERNEL);
     if (!dev)
         return NULL;
 
     dev->parent = card->dev;
     dev->release    = soc_release_rtd_dev;
 
     dev_set_name(dev, "%s", dai_link->name);
 
     ret = device_register(dev);
     if (ret < 0) {
         put_device(dev); /* soc_release_rtd_dev */
         return NULL;
     }
 
     /*
      * for rtd
      */
     rtd = devm_kzalloc(dev,
                sizeof(*rtd) +
                sizeof(*component) * (dai_link->num_cpus +
                          dai_link->num_codecs +
                          dai_link->num_platforms),
                GFP_KERNEL);
     if (!rtd) {
         device_unregister(dev);
         return NULL;
     }
 
     rtd->dev = dev;
     INIT_LIST_HEAD(&rtd->list);
     for_each_pcm_streams(stream) {
         INIT_LIST_HEAD(&rtd->dpcm[stream].be_clients);
         INIT_LIST_HEAD(&rtd->dpcm[stream].fe_clients);
     }
     dev_set_drvdata(dev, rtd);
     INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
 
     /*
      * for rtd->dais
      */
     rtd->dais = devm_kcalloc(dev, dai_link->num_cpus + dai_link->num_codecs,
                     sizeof(struct snd_soc_dai *),
                     GFP_KERNEL);
     if (!rtd->dais)
         goto free_rtd;
 
     /*
      * dais = [][][][][][][][][][][][][][][][][][]
      *    ^cpu_dais         ^codec_dais
      *    |--- num_cpus ---|--- num_codecs --|
      * see
      *  asoc_rtd_to_cpu()
      *  asoc_rtd_to_codec()
      */
     rtd->num_cpus   = dai_link->num_cpus;
     rtd->num_codecs = dai_link->num_codecs;
     rtd->card   = card;
     rtd->dai_link   = dai_link;
     rtd->num    = card->num_rtd++;
 
     /* see for_each_card_rtds */
     list_add_tail(&rtd->list, &card->rtd_list);
 
     ret = device_add_groups(dev, soc_dev_attr_groups);
     if (ret < 0)
         goto free_rtd;
 
     return rtd;
 
 free_rtd:
     soc_free_pcm_runtime(rtd);
     return NULL;
 }
 
 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);
 }
 
 #ifdef CONFIG_PM_SLEEP
 static void soc_playback_digital_mute(struct snd_soc_card *card, int mute)
 {
     struct snd_soc_pcm_runtime *rtd;
     struct snd_soc_dai *dai;
     int playback = SNDRV_PCM_STREAM_PLAYBACK;
     int i;
 
     for_each_card_rtds(card, rtd) {
 
         if (rtd->dai_link->ignore_suspend)
             continue;
 
         for_each_rtd_dais(rtd, i, dai) {
             if (snd_soc_dai_stream_active(dai, playback))
                 snd_soc_dai_digital_mute(dai, mute, playback);
         }
     }
 }
 
 static void soc_dapm_suspend_resume(struct snd_soc_card *card, int event)
 {
     struct snd_soc_pcm_runtime *rtd;
     int stream;
 
     for_each_card_rtds(card, rtd) {
 
         if (rtd->dai_link->ignore_suspend)
             continue;
 
         for_each_pcm_streams(stream)
             snd_soc_dapm_stream_event(rtd, stream, event);
     }
 }
 
 /* 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);
 
     /* 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 */
     soc_playback_digital_mute(card, 1);
 
     /* suspend all pcms */
     for_each_card_rtds(card, rtd) {
         if (rtd->dai_link->ignore_suspend)
             continue;
 
         snd_pcm_suspend_all(rtd->pcm);
     }
 
     snd_soc_card_suspend_pre(card);
 
     /* close any waiting streams */
     snd_soc_flush_all_delayed_work(card);
 
     soc_dapm_suspend_resume(card, 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_rtds(card, rtd) {
 
         if (rtd->dai_link->ignore_suspend)
             continue;
 
         for_each_rtd_components(rtd, i, component) {
             struct snd_soc_dapm_context *dapm =
                 snd_soc_component_get_dapm(component);
 
             /*
              * ignore if component was already suspended
              */
             if (snd_soc_component_is_suspended(component))
                 continue;
 
             /*
              * If there are paths active then the COMPONENT will be
              * held with bias _ON and should not be 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;
                 }
                 fallthrough;
 
             case SND_SOC_BIAS_OFF:
                 snd_soc_component_suspend(component);
                 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;
             }
         }
     }
 
     snd_soc_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_component *component;
 
     /*
      * 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);
 
     snd_soc_card_resume_pre(card);
 
     for_each_card_components(card, component) {
         if (snd_soc_component_is_suspended(component))
             snd_soc_component_resume(component);
     }
 
     soc_dapm_suspend_resume(card, SND_SOC_DAPM_STREAM_RESUME);
 
     /* unmute any active DACs */
     soc_playback_digital_mute(card, 0);
 
     snd_soc_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);
     struct snd_soc_component *component;
 
     /* 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_components(card, component)
         if (snd_soc_component_active(component))
             pinctrl_pm_select_default_state(component->dev);
 
     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);
 
 static void soc_resume_init(struct snd_soc_card *card)
 {
     /* deferred resume work */
     INIT_WORK(&card->deferred_resume_work, soc_resume_deferred);
 }
 #else
 #define snd_soc_suspend NULL
 #define snd_soc_resume NULL
 static inline void soc_resume_init(struct snd_soc_card *card) { }
 #endif
 
 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);
 
 struct snd_soc_dai *snd_soc_find_dai_with_mutex(
     const struct snd_soc_dai_link_component *dlc)
 {
     struct snd_soc_dai *dai;
 
     mutex_lock(&client_mutex);
     dai = snd_soc_find_dai(dlc);
     mutex_unlock(&client_mutex);
 
     return dai;
 }
 EXPORT_SYMBOL_GPL(snd_soc_find_dai_with_mutex);
 
 static int soc_dai_link_sanity_check(struct snd_soc_card *card,
                      struct snd_soc_dai_link *link)
 {
     int i;
     struct snd_soc_dai_link_component *cpu, *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)) {
             dev_dbg(card->dev,
                 "ASoC: codec component %s not found for link %s\n",
                 codec->name, link->name);
             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)) {
             dev_dbg(card->dev,
                 "ASoC: platform component %s not found for link %s\n",
                 platform->name, link->name);
             return -EPROBE_DEFER;
         }
     }
 
     for_each_link_cpus(link, i, cpu) {
         /*
          * 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 (cpu->name && cpu->of_node) {
             dev_err(card->dev,
                 "ASoC: Neither/both cpu name/of_node are set for %s\n",
                 link->name);
             return -EINVAL;
         }
 
         /*
          * Defer card registration if cpu dai component is not added to
          * component list.
          */
         if ((cpu->of_node || cpu->name) &&
             !soc_find_component(cpu)) {
             dev_dbg(card->dev,
                 "ASoC: cpu component %s not found for link %s\n",
                 cpu->name, link->name);
             return -EPROBE_DEFER;
         }
 
         /*
          * At least one of CPU DAI name or CPU device name/node must be
          * specified
          */
         if (!cpu->dai_name &&
             !(cpu->name || cpu->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;
 }
 
 /**
  * snd_soc_remove_pcm_runtime - Remove a pcm_runtime from card
  * @card: The ASoC card to which the pcm_runtime has
  * @rtd: The pcm_runtime to remove
  *
  * This function removes a pcm_runtime from the ASoC card.
  */
 void snd_soc_remove_pcm_runtime(struct snd_soc_card *card,
                 struct snd_soc_pcm_runtime *rtd)
 {
     lockdep_assert_held(&client_mutex);
 
     /* release machine specific resources */
     snd_soc_link_exit(rtd);
 
     /*
      * Notify the machine driver for extra destruction
      */
     snd_soc_card_remove_dai_link(card, rtd->dai_link);
 
     soc_free_pcm_runtime(rtd);
 }
 EXPORT_SYMBOL_GPL(snd_soc_remove_pcm_runtime);
 
 /**
  * snd_soc_add_pcm_runtime - Add a pcm_runtime dynamically via dai_link
  * @card: The ASoC card to which the pcm_runtime is added
  * @dai_link: The DAI link to find pcm_runtime
  *
  * This function adds a pcm_runtime ASoC card by using dai_link.
  *
  * Note: Topology can use this API to add pcm_runtime when probing the
  * topology component. And machine drivers can still define static
  * DAI links in dai_link array.
  */
 int snd_soc_add_pcm_runtime(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, *cpu;
     struct snd_soc_component *component;
     int i, ret;
 
     lockdep_assert_held(&client_mutex);
 
     /*
      * Notify the machine driver for extra initialization
      */
     ret = snd_soc_card_add_dai_link(card, dai_link);
     if (ret < 0)
         return ret;
 
     if (dai_link->ignore)
         return 0;
 
     dev_dbg(card->dev, "ASoC: binding %s\n", dai_link->name);
 
     ret = soc_dai_link_sanity_check(card, dai_link);
     if (ret < 0)
         return ret;
 
     rtd = soc_new_pcm_runtime(card, dai_link);
     if (!rtd)
         return -ENOMEM;
 
     for_each_link_cpus(dai_link, i, cpu) {
         asoc_rtd_to_cpu(rtd, i) = snd_soc_find_dai(cpu);
         if (!asoc_rtd_to_cpu(rtd, i)) {
             dev_info(card->dev, "ASoC: CPU DAI %s not registered\n",
                  cpu->dai_name);
             goto _err_defer;
         }
         snd_soc_rtd_add_component(rtd, asoc_rtd_to_cpu(rtd, i)->component);
     }
 
     /* Find CODEC from registered CODECs */
     for_each_link_codecs(dai_link, i, codec) {
         asoc_rtd_to_codec(rtd, i) = snd_soc_find_dai(codec);
         if (!asoc_rtd_to_codec(rtd, i)) {
             dev_info(card->dev, "ASoC: CODEC DAI %s not registered\n",
                  codec->dai_name);
             goto _err_defer;
         }
 
         snd_soc_rtd_add_component(rtd, asoc_rtd_to_codec(rtd, i)->component);
     }
 
     /* 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_rtd_add_component(rtd, component);
         }
     }
 
     return 0;
 
 _err_defer:
     snd_soc_remove_pcm_runtime(card, rtd);
     return -EPROBE_DEFER;
 }
 EXPORT_SYMBOL_GPL(snd_soc_add_pcm_runtime);
 
 static void snd_soc_runtime_get_dai_fmt(struct snd_soc_pcm_runtime *rtd)
 {
     struct snd_soc_dai_link *dai_link = rtd->dai_link;
     struct snd_soc_dai *dai, *not_used;
     struct device *dev = rtd->dev;
     u64 pos, possible_fmt;
     unsigned int mask = 0, dai_fmt = 0;
     int i, j, priority, pri, until;
 
     /*
      * Get selectable format from each DAIs.
      *
      ****************************
      *            NOTE
      * Using .auto_selectable_formats is not mandatory,
      * we can select format manually from Sound Card.
      * When use it, driver should list well tested format only.
      ****************************
      *
      * ex)
      *  auto_selectable_formats (= SND_SOC_POSSIBLE_xxx)
      *       (A)     (B)     (C)
      *  DAI0_: { 0x000F, 0x00F0, 0x0F00 };
      *  DAI1 : { 0xF000, 0x0F00 };
      *       (X)     (Y)
      *
      * "until" will be 3 in this case (MAX array size from DAI0 and DAI1)
      * Here is dev_dbg() message and comments
      *
      * priority = 1
      * DAI0: (pri, fmt) = (1, 000000000000000F) // 1st check (A) DAI1 is not selected
      * DAI1: (pri, fmt) = (0, 0000000000000000) //               Necessary Waste
      * DAI0: (pri, fmt) = (1, 000000000000000F) // 2nd check (A)
      * DAI1: (pri, fmt) = (1, 000000000000F000) //           (X)
      * priority = 2
      * DAI0: (pri, fmt) = (2, 00000000000000FF) // 3rd check (A) + (B)
      * DAI1: (pri, fmt) = (1, 000000000000F000) //           (X)
      * DAI0: (pri, fmt) = (2, 00000000000000FF) // 4th check (A) + (B)
      * DAI1: (pri, fmt) = (2, 000000000000FF00) //           (X) + (Y)
      * priority = 3
      * DAI0: (pri, fmt) = (3, 0000000000000FFF) // 5th check (A) + (B) + (C)
      * DAI1: (pri, fmt) = (2, 000000000000FF00) //           (X) + (Y)
      * found auto selected format: 0000000000000F00
      */
     until = snd_soc_dai_get_fmt_max_priority(rtd);
     for (priority = 1; priority <= until; priority++) {
 
         dev_dbg(dev, "priority = %d\n", priority);
         for_each_rtd_dais(rtd, j, not_used) {
 
             possible_fmt = ULLONG_MAX;
             for_each_rtd_dais(rtd, i, dai) {
                 u64 fmt = 0;
 
                 pri = (j >= i) ? priority : priority - 1;
                 fmt = snd_soc_dai_get_fmt(dai, pri);
                 dev_dbg(dev, "%s: (pri, fmt) = (%d, %016llX)\n", dai->name, pri, fmt);
                 possible_fmt &= fmt;
             }
             if (possible_fmt)
                 goto found;
         }
     }
     /* Not Found */
     return;
 found:
     dev_dbg(dev, "found auto selected format: %016llX\n", possible_fmt);
 
     /*
      * convert POSSIBLE_DAIFMT to DAIFMT
      *
      * Some basic/default settings on each is defined as 0.
      * see
      *  SND_SOC_DAIFMT_NB_NF
      *  SND_SOC_DAIFMT_GATED
      *
      * SND_SOC_DAIFMT_xxx_MASK can't notice it if Sound Card specify
      * these value, and will be overwrite to auto selected value.
      *
      * To avoid such issue, loop from 63 to 0 here.
      * Small number of SND_SOC_POSSIBLE_xxx will be Hi priority.
      * Basic/Default settings of each part and aboves are defined
      * as Hi priority (= small number) of SND_SOC_POSSIBLE_xxx.
      */
     for (i = 63; i >= 0; i--) {
         pos = 1ULL << i;
         switch (possible_fmt & pos) {
         /*
          * for format
          */
         case SND_SOC_POSSIBLE_DAIFMT_I2S:
         case SND_SOC_POSSIBLE_DAIFMT_RIGHT_J:
         case SND_SOC_POSSIBLE_DAIFMT_LEFT_J:
         case SND_SOC_POSSIBLE_DAIFMT_DSP_A:
         case SND_SOC_POSSIBLE_DAIFMT_DSP_B:
         case SND_SOC_POSSIBLE_DAIFMT_AC97:
         case SND_SOC_POSSIBLE_DAIFMT_PDM:
             dai_fmt = (dai_fmt & ~SND_SOC_DAIFMT_FORMAT_MASK) | i;
             break;
         /*
          * for clock
          */
         case SND_SOC_POSSIBLE_DAIFMT_CONT:
             dai_fmt = (dai_fmt & ~SND_SOC_DAIFMT_CLOCK_MASK) | SND_SOC_DAIFMT_CONT;
             break;
         case SND_SOC_POSSIBLE_DAIFMT_GATED:
             dai_fmt = (dai_fmt & ~SND_SOC_DAIFMT_CLOCK_MASK) | SND_SOC_DAIFMT_GATED;
             break;
         /*
          * for clock invert
          */
         case SND_SOC_POSSIBLE_DAIFMT_NB_NF:
             dai_fmt = (dai_fmt & ~SND_SOC_DAIFMT_INV_MASK) | SND_SOC_DAIFMT_NB_NF;
             break;
         case SND_SOC_POSSIBLE_DAIFMT_NB_IF:
             dai_fmt = (dai_fmt & ~SND_SOC_DAIFMT_INV_MASK) | SND_SOC_DAIFMT_NB_IF;
             break;
         case SND_SOC_POSSIBLE_DAIFMT_IB_NF:
             dai_fmt = (dai_fmt & ~SND_SOC_DAIFMT_INV_MASK) | SND_SOC_DAIFMT_IB_NF;
             break;
         case SND_SOC_POSSIBLE_DAIFMT_IB_IF:
             dai_fmt = (dai_fmt & ~SND_SOC_DAIFMT_INV_MASK) | SND_SOC_DAIFMT_IB_IF;
             break;
         /*
          * for clock provider / consumer
          */
         case SND_SOC_POSSIBLE_DAIFMT_CBP_CFP:
             dai_fmt = (dai_fmt & ~SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) | SND_SOC_DAIFMT_CBP_CFP;
             break;
         case SND_SOC_POSSIBLE_DAIFMT_CBC_CFP:
             dai_fmt = (dai_fmt & ~SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) | SND_SOC_DAIFMT_CBC_CFP;
             break;
         case SND_SOC_POSSIBLE_DAIFMT_CBP_CFC:
             dai_fmt = (dai_fmt & ~SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) | SND_SOC_DAIFMT_CBP_CFC;
             break;
         case SND_SOC_POSSIBLE_DAIFMT_CBC_CFC:
             dai_fmt = (dai_fmt & ~SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) | SND_SOC_DAIFMT_CBC_CFC;
             break;
         }
     }
 
     /*
      * Some driver might have very complex limitation.
      * In such case, user want to auto-select non-limitation part,
      * and want to manually specify complex part.
      *
      * Or for example, if both CPU and Codec can be clock provider,
      * but because of its quality, user want to specify it manually.
      *
      * Use manually specified settings if sound card did.
      */
     if (!(dai_link->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK))
         mask |= SND_SOC_DAIFMT_FORMAT_MASK;
     if (!(dai_link->dai_fmt & SND_SOC_DAIFMT_CLOCK_MASK))
         mask |= SND_SOC_DAIFMT_CLOCK_MASK;
     if (!(dai_link->dai_fmt & SND_SOC_DAIFMT_INV_MASK))
         mask |= SND_SOC_DAIFMT_INV_MASK;
     if (!(dai_link->dai_fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK))
         mask |= SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK;
 
     dai_link->dai_fmt |= (dai_fmt & mask);
 }
 
 /**
  * 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;
     struct snd_soc_dai *codec_dai;
     unsigned int i;
     int ret;
 
     if (!dai_fmt)
         return 0;
 
     for_each_rtd_codec_dais(rtd, i, codec_dai) {
         ret = snd_soc_dai_set_fmt(codec_dai, dai_fmt);
         if (ret != 0 && ret != -ENOTSUPP)
             return ret;
     }
 
     /* Flip the polarity for the "CPU" end of link */
     dai_fmt = snd_soc_daifmt_clock_provider_flipped(dai_fmt);
 
     for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
         ret = snd_soc_dai_set_fmt(cpu_dai, dai_fmt);
         if (ret != 0 && ret != -ENOTSUPP)
             return ret;
     }
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_runtime_set_dai_fmt);
 
 static int soc_init_pcm_runtime(struct snd_soc_card *card,
                 struct snd_soc_pcm_runtime *rtd)
 {
     struct snd_soc_dai_link *dai_link = rtd->dai_link;
     struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
     struct snd_soc_component *component;
     int ret, num, i;
 
     /* set default power off timeout */
     rtd->pmdown_time = pmdown_time;
 
     /* do machine specific initialization */
     ret = snd_soc_link_init(rtd);
     if (ret < 0)
         return ret;
 
     snd_soc_runtime_get_dai_fmt(rtd);
     ret = snd_soc_runtime_set_dai_fmt(rtd, dai_link->dai_fmt);
     if (ret)
         return ret;
 
     /* add DPCM sysfs entries */
     soc_dpcm_debugfs_add(rtd);
 
     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_rtd_components(rtd, i, 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;
     }
 
     /* create compress_device if possible */
     ret = snd_soc_dai_compress_new(cpu_dai, rtd, num);
     if (ret != -ENOTSUPP)
         return ret;
 
     /* 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;
     }
 
     return snd_soc_pcm_dai_new(rtd);
 }
 
 static void soc_set_name_prefix(struct snd_soc_card *card,
                 struct snd_soc_component *component)
 {
     struct device_node *of_node = soc_component_to_node(component);
     const char *str;
     int ret, i;
 
     for (i = 0; i < card->num_configs; i++) {
         struct snd_soc_codec_conf *map = &card->codec_conf[i];
 
         if (snd_soc_is_matching_component(&map->dlc, component) &&
             map->name_prefix) {
             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
      */
     ret = of_property_read_string(of_node, "sound-name-prefix", &str);
     if (ret < 0)
         return;
 
     component->name_prefix = str;
 }
 
 static void soc_remove_component(struct snd_soc_component *component,
                  int probed)
 {
 
     if (!component->card)
         return;
 
     if (probed)
         snd_soc_component_remove(component);
 
     list_del_init(&component->card_list);
     snd_soc_dapm_free(snd_soc_component_get_dapm(component));
     soc_cleanup_component_debugfs(component);
     component->card = NULL;
     snd_soc_component_module_put_when_remove(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 probed = 0;
     int ret;
 
     if (snd_soc_component_is_dummy(component))
         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;
     }
 
     ret = snd_soc_component_module_get_when_probe(component);
     if (ret < 0)
         return ret;
 
     component->card = card;
     soc_set_name_prefix(card, component);
 
     soc_init_component_debugfs(component);
 
     snd_soc_dapm_init(dapm, card, component);
 
     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;
         }
     }
 
     ret = snd_soc_component_probe(component);
     if (ret < 0)
         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);
     probed = 1;
 
     /*
      * machine specific init
      * see
      *  snd_soc_component_set_aux()
      */
     ret = snd_soc_component_init(component);
     if (ret < 0)
         goto err_probe;
 
     ret = snd_soc_add_component_controls(component,
                          component->driver->controls,
                          component->driver->num_controls);
     if (ret < 0)
         goto err_probe;
 
     ret = snd_soc_dapm_add_routes(dapm,
                       component->driver->dapm_routes,
                       component->driver->num_dapm_routes);
     if (ret < 0) {
         if (card->disable_route_checks) {
             dev_info(card->dev,
                  "%s: disable_route_checks set, ignoring errors on add_routes\n",
                  __func__);
         } else {
             dev_err(card->dev,
                 "%s: snd_soc_dapm_add_routes failed: %d\n",
                 __func__, ret);
             goto err_probe;
         }
     }
 
     /* see for_each_card_components */
     list_add(&component->card_list, &card->component_dev_list);
 
 err_probe:
     if (ret < 0)
         soc_remove_component(component, probed);
 
     return ret;
 }
 
 static void soc_remove_link_dais(struct snd_soc_card *card)
 {
     struct snd_soc_pcm_runtime *rtd;
     int order;
 
     for_each_comp_order(order) {
         for_each_card_rtds(card, rtd) {
             /* remove all rtd connected DAIs in good order */
             snd_soc_pcm_dai_remove(rtd, order);
         }
     }
 }
 
 static int soc_probe_link_dais(struct snd_soc_card *card)
 {
     struct snd_soc_pcm_runtime *rtd;
     int order, ret;
 
     for_each_comp_order(order) {
         for_each_card_rtds(card, rtd) {
 
             dev_dbg(card->dev,
                 "ASoC: probe %s dai link %d late %d\n",
                 card->name, rtd->num, order);
 
             /* probe all rtd connected DAIs in good order */
             ret = snd_soc_pcm_dai_probe(rtd, order);
             if (ret)
                 return ret;
         }
     }
 
     return 0;
 }
 
 static void soc_remove_link_components(struct snd_soc_card *card)
 {
     struct snd_soc_component *component;
     struct snd_soc_pcm_runtime *rtd;
     int i, order;
 
     for_each_comp_order(order) {
         for_each_card_rtds(card, rtd) {
             for_each_rtd_components(rtd, i, component) {
                 if (component->driver->remove_order != order)
                     continue;
 
                 soc_remove_component(component, 1);
             }
         }
     }
 }
 
 static int soc_probe_link_components(struct snd_soc_card *card)
 {
     struct snd_soc_component *component;
     struct snd_soc_pcm_runtime *rtd;
     int i, ret, order;
 
     for_each_comp_order(order) {
         for_each_card_rtds(card, rtd) {
             for_each_rtd_components(rtd, i, component) {
                 if (component->driver->probe_order != order)
                     continue;
 
                 ret = soc_probe_component(card, component);
                 if (ret < 0)
                     return ret;
             }
         }
     }
 
     return 0;
 }
 
 static void soc_unbind_aux_dev(struct snd_soc_card *card)
 {
     struct snd_soc_component *component, *_component;
 
     for_each_card_auxs_safe(card, component, _component) {
         /* for snd_soc_component_init() */
         snd_soc_component_set_aux(component, NULL);
         list_del(&component->card_aux_list);
     }
 }
 
 static int soc_bind_aux_dev(struct snd_soc_card *card)
 {
     struct snd_soc_component *component;
     struct snd_soc_aux_dev *aux;
     int i;
 
     for_each_card_pre_auxs(card, i, aux) {
         /* codecs, usually analog devices */
         component = soc_find_component(&aux->dlc);
         if (!component)
             return -EPROBE_DEFER;
 
         /* for snd_soc_component_init() */
         snd_soc_component_set_aux(component, aux);
         /* see for_each_card_auxs */
         list_add(&component->card_aux_list, &card->aux_comp_list);
     }
     return 0;
 }
 
 static int soc_probe_aux_devices(struct snd_soc_card *card)
 {
     struct snd_soc_component *component;
     int order;
     int ret;
 
     for_each_comp_order(order) {
         for_each_card_auxs(card, component) {
             if (component->driver->probe_order != order)
                 continue;
 
             ret = soc_probe_component(card, component);
             if (ret < 0)
                 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) {
         for_each_card_auxs_safe(card, comp, _comp) {
             if (comp->driver->remove_order == order)
                 soc_remove_component(comp, 1);
         }
     }
 }
 
 #ifdef CONFIG_DMI
 /*
  * 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 */
 };
 
 /*
  * 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;
 }
 
 /*
  * Append a string to card->dmi_longname with character cleanups.
  */
 static void append_dmi_string(struct snd_soc_card *card, const char *str)
 {
     char *dst = card->dmi_longname;
     size_t dst_len = sizeof(card->dmi_longname);
     size_t len;
 
     len = strlen(dst);
     snprintf(dst + len, dst_len - len, "-%s", str);
 
     len++;  /* skip the separator "-" */
     if (len < dst_len)
         cleanup_dmi_name(dst + len);
 }
 
 /**
  * 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, *board;
 
     if (card->long_name)
         return 0; /* long name already set by driver or from DMI */
 
     if (!dmi_available)
         return 0;
 
     /* 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->dmi_longname), "%s", vendor);
     cleanup_dmi_name(card->dmi_longname);
 
     product = dmi_get_system_info(DMI_PRODUCT_NAME);
     if (product && is_dmi_valid(product)) {
         const char *product_version = dmi_get_system_info(DMI_PRODUCT_VERSION);
 
         append_dmi_string(card, product);
 
         /*
          * some vendors like Lenovo may only put a self-explanatory
          * name in the product version field
          */
         if (product_version && is_dmi_valid(product_version))
             append_dmi_string(card, product_version);
     }
 
     board = dmi_get_system_info(DMI_BOARD_NAME);
     if (board && is_dmi_valid(board)) {
         if (!product || strcasecmp(board, product))
             append_dmi_string(card, board);
     } 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)
         append_dmi_string(card, flavour);
 
     /* 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 BEs ? */
         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_dbg(card->dev, "info: override BE DAI link %s\n",
                 card->dai_link[i].name);
 
             /* override platform component */
             if (!dai_link->platforms) {
                 dev_err(card->dev, "init platform error");
                 continue;
             }
 
             if (component->dev->of_node)
                 dai_link->platforms->of_node = component->dev->of_node;
             else
                 dai_link->platforms->name = component->name;
 
             /* convert non BE into BE */
             if (!dai_link->no_pcm) {
                 dai_link->no_pcm = 1;
 
                 if (dai_link->dpcm_playback)
                     dev_warn(card->dev,
                          "invalid configuration, dailink %s has flags no_pcm=0 and dpcm_playback=1\n",
                          dai_link->name);
                 if (dai_link->dpcm_capture)
                     dev_warn(card->dev,
                          "invalid configuration, dailink %s has flags no_pcm=0 and dpcm_capture=1\n",
                          dai_link->name);
 
                 /* convert normal link into DPCM one */
                 if (!(dai_link->dpcm_playback ||
                       dai_link->dpcm_capture)) {
                     dai_link->dpcm_playback = !dai_link->capture_only;
                     dai_link->dpcm_capture = !dai_link->playback_only;
                 }
             }
 
             /*
              * override any BE fixups
              * see
              *  snd_soc_link_be_hw_params_fixup()
              */
             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;
         }
     }
 }
 
 #define soc_setup_card_name(name, name1, name2, norm)       \
     __soc_setup_card_name(name, sizeof(name), name1, name2, norm)
 static void __soc_setup_card_name(char *name, int len,
                   const char *name1, const char *name2,
                   int normalization)
 {
     int i;
 
     snprintf(name, len, "%s", name1 ? name1 : name2);
 
     if (!normalization)
         return;
 
     /*
      * Name normalization
      *
      * The driver name is somewhat special, as it's used as a key for
      * searches in the user-space.
      *
      * ex)
      *  "abcd??efg" -> "abcd__efg"
      */
     for (i = 0; i < len; i++) {
         switch (name[i]) {
         case '_':
         case '-':
         case '\0':
             break;
         default:
             if (!isalnum(name[i]))
                 name[i] = '_';
             break;
         }
     }
 }
 
 static void soc_cleanup_card_resources(struct snd_soc_card *card)
 {
     struct snd_soc_pcm_runtime *rtd, *n;
 
     if (card->snd_card)
         snd_card_disconnect_sync(card->snd_card);
 
     snd_soc_dapm_shutdown(card);
 
     /* remove and free each DAI */
     soc_remove_link_dais(card);
     soc_remove_link_components(card);
 
     for_each_card_rtds_safe(card, rtd, n)
         snd_soc_remove_pcm_runtime(card, rtd);
 
     /* remove auxiliary devices */
     soc_remove_aux_devices(card);
     soc_unbind_aux_dev(card);
 
     snd_soc_dapm_free(&card->dapm);
     soc_cleanup_card_debugfs(card);
 
     /* remove the card */
     snd_soc_card_remove(card);
 
     if (card->snd_card) {
         snd_card_free(card->snd_card);
         card->snd_card = NULL;
     }
 }
 
 static void snd_soc_unbind_card(struct snd_soc_card *card, bool unregister)
 {
     if (card->instantiated) {
         card->instantiated = false;
         snd_soc_flush_all_delayed_work(card);
 
         soc_cleanup_card_resources(card);
         if (!unregister)
             list_add(&card->list, &unbind_card_list);
     } else {
         if (unregister)
             list_del(&card->list);
     }
 }
 
 static int snd_soc_bind_card(struct snd_soc_card *card)
 {
     struct snd_soc_pcm_runtime *rtd;
     struct snd_soc_component *component;
     struct snd_soc_dai_link *dai_link;
     int ret, i;
 
     mutex_lock(&client_mutex);
     mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_INIT);
 
     snd_soc_dapm_init(&card->dapm, card, NULL);
 
     /* check whether any platform is ignore machine FE and using topology */
     soc_check_tplg_fes(card);
 
     /* bind aux_devs too */
     ret = soc_bind_aux_dev(card);
     if (ret < 0)
         goto probe_end;
 
     /* add predefined DAI links to the list */
     card->num_rtd = 0;
     for_each_card_prelinks(card, i, dai_link) {
         ret = snd_soc_add_pcm_runtime(card, dai_link);
         if (ret < 0)
             goto probe_end;
     }
 
     /* 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);
 
     soc_resume_init(card);
 
     ret = snd_soc_dapm_new_controls(&card->dapm, card->dapm_widgets,
                     card->num_dapm_widgets);
     if (ret < 0)
         goto probe_end;
 
     ret = snd_soc_dapm_new_controls(&card->dapm, card->of_dapm_widgets,
                     card->num_of_dapm_widgets);
     if (ret < 0)
         goto probe_end;
 
     /* initialise the sound card only once */
     ret = snd_soc_card_probe(card);
     if (ret < 0)
         goto probe_end;
 
     /* probe all components used by DAI links on this card */
     ret = soc_probe_link_components(card);
     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) {
         dev_err(card->dev,
             "ASoC: failed to probe aux component %d\n", ret);
         goto probe_end;
     }
 
     /* probe all DAI links on this card */
     ret = soc_probe_link_dais(card);
     if (ret < 0) {
         dev_err(card->dev,
             "ASoC: failed to instantiate card %d\n", ret);
         goto probe_end;
     }
 
     for_each_card_rtds(card, rtd) {
         ret = soc_init_pcm_runtime(card, rtd);
         if (ret < 0)
             goto probe_end;
     }
 
     snd_soc_dapm_link_dai_widgets(card);
     snd_soc_dapm_connect_dai_link_widgets(card);
 
     ret = snd_soc_add_card_controls(card, card->controls,
                     card->num_controls);
     if (ret < 0)
         goto probe_end;
 
     ret = snd_soc_dapm_add_routes(&card->dapm, card->dapm_routes,
                       card->num_dapm_routes);
     if (ret < 0) {
         if (card->disable_route_checks) {
             dev_info(card->dev,
                  "%s: disable_route_checks set, ignoring errors on add_routes\n",
                  __func__);
         } else {
             dev_err(card->dev,
                  "%s: snd_soc_dapm_add_routes failed: %d\n",
                  __func__, ret);
             goto probe_end;
         }
     }
 
     ret = snd_soc_dapm_add_routes(&card->dapm, card->of_dapm_routes,
                       card->num_of_dapm_routes);
     if (ret < 0)
         goto probe_end;
 
     /* try to set some sane longname if DMI is available */
     snd_soc_set_dmi_name(card, NULL);
 
     soc_setup_card_name(card->snd_card->shortname,
                 card->name, NULL, 0);
     soc_setup_card_name(card->snd_card->longname,
                 card->long_name, card->name, 0);
     soc_setup_card_name(card->snd_card->driver,
                 card->driver_name, card->name, 1);
 
     if (card->components) {
         /* the current implementation of snd_component_add() accepts */
         /* multiple components in the string separated by space, */
         /* but the string collision (identical string) check might */
         /* not work correctly */
         ret = snd_component_add(card->snd_card, card->components);
         if (ret < 0) {
             dev_err(card->dev, "ASoC: %s snd_component_add() failed: %d\n",
                 card->name, ret);
             goto probe_end;
         }
     }
 
     ret = snd_soc_card_late_probe(card);
     if (ret < 0)
         goto probe_end;
 
     snd_soc_dapm_new_widgets(card);
     snd_soc_card_fixup_controls(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);
 
     /* deactivate pins to sleep state */
     for_each_card_components(card, component)
         if (!snd_soc_component_active(component))
             pinctrl_pm_select_sleep_state(component->dev);
 
 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 devm_snd_soc_register_card(&pdev->dev, card);
 }
 
 int snd_soc_poweroff(struct device *dev)
 {
     struct snd_soc_card *card = dev_get_drvdata(dev);
     struct snd_soc_component *component;
 
     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_components(card, component)
         pinctrl_pm_select_sleep_state(component->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,
 };
 
 /**
  * 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 i;
 
     for (i = 0; i < num_controls; i++) {
         const struct snd_kcontrol_new *control = &controls[i];
         int 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;
 }
 
 /**
  * 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_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);
 
     INIT_LIST_HEAD(&card->widgets);
     INIT_LIST_HEAD(&card->paths);
     INIT_LIST_HEAD(&card->dapm_list);
     INIT_LIST_HEAD(&card->aux_comp_list);
     INIT_LIST_HEAD(&card->component_dev_list);
     INIT_LIST_HEAD(&card->list);
     INIT_LIST_HEAD(&card->rtd_list);
     INIT_LIST_HEAD(&card->dapm_dirty);
     INIT_LIST_HEAD(&card->dobj_list);
 
     card->instantiated = 0;
     mutex_init(&card->mutex);
     mutex_init(&card->dapm_mutex);
     mutex_init(&card->pcm_mutex);
 
     return snd_soc_bind_card(card);
 }
 EXPORT_SYMBOL_GPL(snd_soc_register_card);
 
 /**
  * snd_soc_unregister_card - Unregister a card with the ASoC core
  *
  * @card: Card to unregister
  *
  */
 void 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);
 }
 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)
 {
     const char *devname = dev_name(dev);
     char *found, *name;
     unsigned int id1, id2;
 
     if (devname == NULL)
         return NULL;
 
     name = devm_kstrdup(dev, devname, GFP_KERNEL);
     if (!name)
         return NULL;
 
     /* 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';
         }
 
     /* I2C component devices are named "bus-addr" */
     } else if (sscanf(name, "%x-%x", &id1, &id2) == 2) {
 
         /* create unique ID number from I2C addr and bus */
         *id = ((id1 & 0xffff) << 16) + id2;
 
         devm_kfree(dev, name);
 
         /* sanitize component name for DAI link creation */
         name = devm_kasprintf(dev, GFP_KERNEL, "%s.%s", dev->driver->name, devname);
     } else {
         *id = 0;
     }
 
     return name;
 }
 
 /*
  * 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 devm_kstrdup(dev, dai_drv->name, GFP_KERNEL);
 }
 
 void snd_soc_unregister_dai(struct snd_soc_dai *dai)
 {
     dev_dbg(dai->dev, "ASoC: Unregistered DAI '%s'\n", dai->name);
     list_del(&dai->list);
 }
 EXPORT_SYMBOL_GPL(snd_soc_unregister_dai);
 
 /**
  * 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
  * @legacy_dai_naming: if %true, use legacy single-name format;
  *  if %false, use multiple-name format;
  *
  * 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.
  */
 struct snd_soc_dai *snd_soc_register_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));
 
     lockdep_assert_held(&client_mutex);
 
     dai = devm_kzalloc(dev, sizeof(*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)
         return NULL;
 
     dai->component = component;
     dai->dev = dev;
     dai->driver = dai_drv;
 
     /* 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;
 }
 EXPORT_SYMBOL_GPL(snd_soc_register_dai);
 
 /**
  * snd_soc_unregister_dais - 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)
         snd_soc_unregister_dai(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 snd_soc_dai *dai;
     unsigned int i;
     int ret;
 
     for (i = 0; i < count; i++) {
         dai = snd_soc_register_dai(component, dai_drv + i, count == 1 &&
                        component->driver->legacy_dai_naming);
         if (dai == NULL) {
             ret = -ENOMEM;
             goto err;
         }
     }
 
     return 0;
 
 err:
     snd_soc_unregister_dais(component);
 
     return ret;
 }
 
 #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;
 
     list_for_each_entry_safe(card, c, &unbind_card_list, list)
         if (!snd_soc_bind_card(card))
             list_del(&card->list);
 }
 
 static void snd_soc_del_component_unlocked(struct snd_soc_component *component)
 {
     struct snd_soc_card *card = component->card;
 
     snd_soc_unregister_dais(component);
 
     if (card)
         snd_soc_unbind_card(card, false);
 
     list_del(&component->list);
 }
 
 int snd_soc_component_initialize(struct snd_soc_component *component,
                  const struct snd_soc_component_driver *driver,
                  struct device *dev)
 {
     INIT_LIST_HEAD(&component->dai_list);
     INIT_LIST_HEAD(&component->dobj_list);
     INIT_LIST_HEAD(&component->card_list);
     INIT_LIST_HEAD(&component->list);
     mutex_init(&component->io_mutex);
 
     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;
 
 #ifdef CONFIG_DEBUG_FS
     if (!component->debugfs_prefix)
         component->debugfs_prefix = driver->debugfs_prefix;
 #endif
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_component_initialize);
 
 int snd_soc_add_component(struct snd_soc_component *component,
               struct snd_soc_dai_driver *dai_drv,
               int num_dai)
 {
     int ret;
     int i;
 
     mutex_lock(&client_mutex);
 
     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(component->dev, "ASoC: Failed to register DAIs: %d\n",
             ret);
         goto err_cleanup;
     }
 
     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);
 
 err_cleanup:
     if (ret < 0)
         snd_soc_del_component_unlocked(component);
 
     mutex_unlock(&client_mutex);
 
     if (ret == 0)
         snd_soc_try_rebind_card();
 
     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;
     int ret;
 
     component = devm_kzalloc(dev, sizeof(*component), GFP_KERNEL);
     if (!component)
         return -ENOMEM;
 
     ret = snd_soc_component_initialize(component, component_driver, dev);
     if (ret < 0)
         return ret;
 
     return snd_soc_add_component(component, dai_drv, num_dai);
 }
 EXPORT_SYMBOL_GPL(snd_soc_register_component);
 
 /**
  * snd_soc_unregister_component_by_driver - Unregister component using a given driver
  * from the ASoC core
  *
  * @dev: The device to unregister
  * @component_driver: The component driver to unregister
  */
 void snd_soc_unregister_component_by_driver(struct device *dev,
                         const struct snd_soc_component_driver *component_driver)
 {
     struct snd_soc_component *component;
 
     if (!component_driver)
         return;
 
     mutex_lock(&client_mutex);
     component = snd_soc_lookup_component_nolocked(dev, component_driver->name);
     if (!component)
         goto out;
 
     snd_soc_del_component_unlocked(component);
 
 out:
     mutex_unlock(&client_mutex);
 }
 EXPORT_SYMBOL_GPL(snd_soc_unregister_component_by_driver);
 
 /**
  * snd_soc_unregister_component - Unregister all related component
  * from the ASoC core
  *
  * @dev: The device to unregister
  */
 void snd_soc_unregister_component(struct device *dev)
 {
     mutex_lock(&client_mutex);
     while (1) {
         struct snd_soc_component *component = snd_soc_lookup_component_nolocked(dev, NULL);
 
         if (!component)
             break;
 
         snd_soc_del_component_unlocked(component);
     }
     mutex_unlock(&client_mutex);
 }
 EXPORT_SYMBOL_GPL(snd_soc_unregister_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;
 
     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) {
         dev_err(card->dev, "ASoC: Property '%s's length is zero\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;
 
     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++) {
         int 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_parse_pin_switches(struct snd_soc_card *card, const char *prop)
 {
     const unsigned int nb_controls_max = 16;
     const char **strings, *control_name;
     struct snd_kcontrol_new *controls;
     struct device *dev = card->dev;
     unsigned int i, nb_controls;
     int ret;
 
     if (!of_property_read_bool(dev->of_node, prop))
         return 0;
 
     strings = devm_kcalloc(dev, nb_controls_max,
                    sizeof(*strings), GFP_KERNEL);
     if (!strings)
         return -ENOMEM;
 
     ret = of_property_read_string_array(dev->of_node, prop,
                         strings, nb_controls_max);
     if (ret < 0)
         return ret;
 
     nb_controls = (unsigned int)ret;
 
     controls = devm_kcalloc(dev, nb_controls,
                 sizeof(*controls), GFP_KERNEL);
     if (!controls)
         return -ENOMEM;
 
     for (i = 0; i < nb_controls; i++) {
         control_name = devm_kasprintf(dev, GFP_KERNEL,
                           "%s Switch", strings[i]);
         if (!control_name)
             return -ENOMEM;
 
         controls[i].iface = SNDRV_CTL_ELEM_IFACE_MIXER;
         controls[i].name = control_name;
         controls[i].info = snd_soc_dapm_info_pin_switch;
         controls[i].get = snd_soc_dapm_get_pin_switch;
         controls[i].put = snd_soc_dapm_put_pin_switch;
         controls[i].private_value = (unsigned long)strings[i];
     }
 
     card->controls = controls;
     card->num_controls = nb_controls;
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_of_parse_pin_switches);
 
 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->dlc.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;
 
     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;
 
     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 -ENOMEM;
     }
 
     for (i = 0; i < num_routes; i++) {
         int 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);
 
 int snd_soc_of_parse_aux_devs(struct snd_soc_card *card, const char *propname)
 {
     struct device_node *node = card->dev->of_node;
     struct snd_soc_aux_dev *aux;
     int num, i;
 
     num = of_count_phandle_with_args(node, propname, NULL);
     if (num == -ENOENT) {
         return 0;
     } else if (num < 0) {
         dev_err(card->dev, "ASOC: Property '%s' could not be read: %d\n",
             propname, num);
         return num;
     }
 
     aux = devm_kcalloc(card->dev, num, sizeof(*aux), GFP_KERNEL);
     if (!aux)
         return -ENOMEM;
     card->aux_dev = aux;
     card->num_aux_devs = num;
 
     for_each_card_pre_auxs(card, i, aux) {
         aux->dlc.of_node = of_parse_phandle(node, propname, i);
         if (!aux->dlc.of_node)
             return -EINVAL;
     }
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_of_parse_aux_devs);
 
 unsigned int snd_soc_daifmt_clock_provider_flipped(unsigned int dai_fmt)
 {
     unsigned int inv_dai_fmt = dai_fmt & ~SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK;
 
     switch (dai_fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
     case SND_SOC_DAIFMT_CBP_CFP:
         inv_dai_fmt |= SND_SOC_DAIFMT_CBC_CFC;
         break;
     case SND_SOC_DAIFMT_CBP_CFC:
         inv_dai_fmt |= SND_SOC_DAIFMT_CBC_CFP;
         break;
     case SND_SOC_DAIFMT_CBC_CFP:
         inv_dai_fmt |= SND_SOC_DAIFMT_CBP_CFC;
         break;
     case SND_SOC_DAIFMT_CBC_CFC:
         inv_dai_fmt |= SND_SOC_DAIFMT_CBP_CFP;
         break;
     }
 
     return inv_dai_fmt;
 }
 EXPORT_SYMBOL_GPL(snd_soc_daifmt_clock_provider_flipped);
 
 unsigned int snd_soc_daifmt_clock_provider_from_bitmap(unsigned int bit_frame)
 {
     /*
      * bit_frame is return value from
      *  snd_soc_daifmt_parse_clock_provider_raw()
      */
 
     /* Codec base */
     switch (bit_frame) {
     case 0x11:
         return SND_SOC_DAIFMT_CBP_CFP;
     case 0x10:
         return SND_SOC_DAIFMT_CBP_CFC;
     case 0x01:
         return SND_SOC_DAIFMT_CBC_CFP;
     default:
         return SND_SOC_DAIFMT_CBC_CFC;
     }
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_daifmt_clock_provider_from_bitmap);
 
 unsigned int snd_soc_daifmt_parse_format(struct device_node *np,
                      const char *prefix)
 {
     int ret;
     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) {
         int i;
 
         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;
     }
 
     return format;
 }
 EXPORT_SYMBOL_GPL(snd_soc_daifmt_parse_format);
 
 unsigned int snd_soc_daifmt_parse_clock_provider_raw(struct device_node *np,
                              const char *prefix,
                              struct device_node **bitclkmaster,
                              struct device_node **framemaster)
 {
     char prop[128];
     unsigned int bit, frame;
 
     if (!prefix)
         prefix = "";
 
     /*
      * check "[prefix]bitclock-master"
      * check "[prefix]frame-master"
      */
     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);
 
     /*
      * return bitmap.
      * It will be parameter of
      *  snd_soc_daifmt_clock_provider_from_bitmap()
      */
     return (bit << 4) + frame;
 }
 EXPORT_SYMBOL_GPL(snd_soc_daifmt_parse_clock_provider_raw);
 
 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)
         ret = snd_soc_component_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(const struct of_phandle_args *args,
                 const char **dai_name)
 {
     struct snd_soc_component *pos;
     int ret = -EPROBE_DEFER;
 
     mutex_lock(&client_mutex);
     for_each_component(pos) {
         struct device_node *component_of_node = soc_component_to_node(pos);
 
         if (component_of_node != args->np || !pos->num_dai)
             continue;
 
         ret = snd_soc_component_of_xlate_dai_name(pos, args, dai_name);
         if (ret == -ENOTSUPP) {
             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;
         } else if (ret) {
             /*
              * if another error than ENOTSUPP is returned go on and
              * check if another component is provided with the same
              * node. This may happen if a device provides several
              * components
              */
             continue;
         }
 
         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);
 
 static void __snd_soc_of_put_component(struct snd_soc_dai_link_component *component)
 {
     if (component->of_node) {
         of_node_put(component->of_node);
         component->of_node = NULL;
     }
 }
 
 static int __snd_soc_of_get_dai_link_component_alloc(
     struct device *dev, struct device_node *of_node,
     struct snd_soc_dai_link_component **ret_component,
     int *ret_num)
 {
     struct snd_soc_dai_link_component *component;
     int num;
 
     /* Count the number of CPUs/CODECs */
     num = of_count_phandle_with_args(of_node, "sound-dai", "#sound-dai-cells");
     if (num <= 0) {
         if (num == -ENOENT)
             dev_err(dev, "No 'sound-dai' property\n");
         else
             dev_err(dev, "Bad phandle in 'sound-dai'\n");
         return num;
     }
     component = devm_kcalloc(dev, num, sizeof(*component), GFP_KERNEL);
     if (!component)
         return -ENOMEM;
 
     *ret_component  = component;
     *ret_num    = num;
 
     return 0;
 }
 
 static int __snd_soc_of_get_dai_link_component_parse(
     struct device_node *of_node,
     struct snd_soc_dai_link_component *component, int index)
 {
     struct of_phandle_args args;
     int ret;
 
     ret = of_parse_phandle_with_args(of_node, "sound-dai", "#sound-dai-cells",
                      index, &args);
     if (ret)
         return ret;
 
     ret = snd_soc_get_dai_name(&args, &component->dai_name);
     if (ret < 0)
         return ret;
 
     component->of_node = args.np;
     return 0;
 }
 
 /*
  * 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)
         __snd_soc_of_put_component(component);
 }
 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 snd_soc_dai_link_component *component;
     int index, ret;
 
     ret = __snd_soc_of_get_dai_link_component_alloc(dev, of_node,
                      &dai_link->codecs, &dai_link->num_codecs);
     if (ret < 0)
         return ret;
 
     /* Parse the list */
     for_each_link_codecs(dai_link, index, component) {
         ret = __snd_soc_of_get_dai_link_component_parse(of_node, component, index);
         if (ret)
             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);
 
 /*
  * snd_soc_of_put_dai_link_cpus - Dereference device nodes in the codecs array
  * @dai_link: DAI link
  *
  * Dereference device nodes acquired by snd_soc_of_get_dai_link_cpus().
  */
 void snd_soc_of_put_dai_link_cpus(struct snd_soc_dai_link *dai_link)
 {
     struct snd_soc_dai_link_component *component;
     int index;
 
     for_each_link_cpus(dai_link, index, component)
         __snd_soc_of_put_component(component);
 }
 EXPORT_SYMBOL_GPL(snd_soc_of_put_dai_link_cpus);
 
 /*
  * snd_soc_of_get_dai_link_cpus - Parse a list of CPU DAIs in the devicetree
  * @dev: Card device
  * @of_node: Device node
  * @dai_link: DAI link
  *
  * Is analogous to snd_soc_of_get_dai_link_codecs but parses a list of CPU DAIs
  * instead.
  *
  * Returns 0 for success
  */
 int snd_soc_of_get_dai_link_cpus(struct device *dev,
                  struct device_node *of_node,
                  struct snd_soc_dai_link *dai_link)
 {
     struct snd_soc_dai_link_component *component;
     int index, ret;
 
     /* Count the number of CPUs */
     ret = __snd_soc_of_get_dai_link_component_alloc(dev, of_node,
                      &dai_link->cpus, &dai_link->num_cpus);
     if (ret < 0)
         return ret;
 
     /* Parse the list */
     for_each_link_cpus(dai_link, index, component) {
         ret = __snd_soc_of_get_dai_link_component_parse(of_node, component, index);
         if (ret)
             goto err;
     }
     return 0;
 err:
     snd_soc_of_put_dai_link_cpus(dai_link);
     dai_link->cpus = NULL;
     dai_link->num_cpus = 0;
     return ret;
 }
 EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_link_cpus);
 
 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");