Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3214 insertions, 0 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
new file mode 100644
index 000000000..e9da95ebc
--- /dev/null
+++ b/sound/soc/soc-core.c
@@ -0,0 +1,3214 @@
+// 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/jack.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dpcm.h>
+#include <sound/soc-topology.h>
+#include <sound/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_set(struct device *dev,
+			       struct device_attribute *attr,
+			       const char *buf, size_t count)
+{
+	struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
+	int ret;
+
+	ret = kstrtol(buf, 10, &rtd->pmdown_time);
+	if (ret)
+		return ret;
+
+	return count;
+}
+
+static DEVICE_ATTR(pmdown_time, 0644, pmdown_time_show, pmdown_time_set);
+
+static struct attribute *soc_dev_attrs[] = {
+	&dev_attr_pmdown_time.attr,
+	NULL
+};
+
+static umode_t soc_dev_attr_is_visible(struct kobject *kobj,
+				       struct attribute *attr, int idx)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
+
+	if (!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()
+	 */
+	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)
+		goto free_rtd;
+
+	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
+/* 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 playback = SNDRV_PCM_STREAM_PLAYBACK;
+	int i;
+
+	/* If the card is not initialized yet there is nothing to do */
+	if (!card->instantiated)
+		return 0;
+
+	/*
+	 * Due to the resume being scheduled into a workqueue we could
+	 * suspend before that's finished - wait for it to complete.
+	 */
+	snd_power_wait(card->snd_card, SNDRV_CTL_POWER_D0);
+
+	/* we're going to block userspace touching us until resume completes */
+	snd_power_change_state(card->snd_card, SNDRV_CTL_POWER_D3hot);
+
+	/* mute any active DACs */
+	for_each_card_rtds(card, rtd) {
+		struct snd_soc_dai *dai;
+
+		if (rtd->dai_link->ignore_suspend)
+			continue;
+
+		for_each_rtd_dais(rtd, i, dai) {
+			if (snd_soc_dai_stream_active(dai, playback))
+				snd_soc_dai_digital_mute(dai, 1, playback);
+		}
+	}
+
+	/* 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);
+
+	for_each_card_rtds(card, rtd) {
+		int stream;
+
+		if (rtd->dai_link->ignore_suspend)
+			continue;
+
+		for_each_pcm_streams(stream)
+			snd_soc_dapm_stream_event(rtd, stream,
+						  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_pcm_runtime *rtd;
+	struct snd_soc_component *component;
+	int i;
+
+	/*
+	 * our power state is still SNDRV_CTL_POWER_D3hot from suspend time,
+	 * so userspace apps are blocked from touching us
+	 */
+
+	dev_dbg(card->dev, "ASoC: starting resume work\n");
+
+	/* Bring us up into D2 so that DAPM starts enabling things */
+	snd_power_change_state(card->snd_card, SNDRV_CTL_POWER_D2);
+
+	snd_soc_card_resume_pre(card);
+
+	for_each_card_components(card, component) {
+		if (snd_soc_component_is_suspended(component))
+			snd_soc_component_resume(component);
+	}
+
+	for_each_card_rtds(card, rtd) {
+		int stream;
+
+		if (rtd->dai_link->ignore_suspend)
+			continue;
+
+		for_each_pcm_streams(stream)
+			snd_soc_dapm_stream_event(rtd, stream,
+						  SND_SOC_DAPM_STREAM_RESUME);
+	}
+
+	/* unmute any active DACs */
+	for_each_card_rtds(card, rtd) {
+		struct snd_soc_dai *dai;
+		int playback = SNDRV_PCM_STREAM_PLAYBACK;
+
+		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, 0, playback);
+		}
+	}
+
+	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 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;
+
+	if (dai_link->dai_fmt) {
+		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) {
+		if (ret < 0)
+			dev_err(card->dev, "ASoC: can't create compress %s\n",
+				dai_link->stream_name);
+		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)) {
+			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);
+
+	/* For framework level robustness */
+	snd_soc_component_set_jack(component, NULL, NULL);
+
+	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 (!strcmp(component->name, "snd-soc-dummy"))
+		return 0;
+
+	if (component->card) {
+		if (component->card != card) {
+			dev_err(component->dev,
+				"Trying to bind component to card \"%s\" but is already bound to card \"%s\"\n",
+				card->name, component->card->name);
+			return -ENODEV;
+		}
+		return 0;
+	}
+
+	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) {
+		dev_err(component->dev,
+			"ASoC: failed to probe component %d\n", ret);
+		goto err_probe;
+	}
+	WARN(dapm->idle_bias_off &&
+	     dapm->bias_level != SND_SOC_BIAS_OFF,
+	     "codec %s can not start from non-off bias with idle_bias_off==1\n",
+	     component->name);
+	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);
+		}
+	}
+}
+
+/**
+ * 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 inv_dai_fmt;
+	unsigned int i;
+	int ret;
+
+	for_each_rtd_codec_dais(rtd, i, codec_dai) {
+		ret = snd_soc_dai_set_fmt(codec_dai, dai_fmt);
+		if (ret != 0 && ret != -ENOTSUPP) {
+			dev_warn(codec_dai->dev,
+				 "ASoC: Failed to set DAI format: %d\n", ret);
+			return ret;
+		}
+	}
+
+	/*
+	 * Flip the polarity for the "CPU" end of a CODEC<->CODEC link
+	 * the component which has non_legacy_dai_naming is Codec
+	 */
+	inv_dai_fmt = dai_fmt & ~SND_SOC_DAIFMT_MASTER_MASK;
+	switch (dai_fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBM_CFM:
+		inv_dai_fmt |= SND_SOC_DAIFMT_CBS_CFS;
+		break;
+	case SND_SOC_DAIFMT_CBM_CFS:
+		inv_dai_fmt |= SND_SOC_DAIFMT_CBS_CFM;
+		break;
+	case SND_SOC_DAIFMT_CBS_CFM:
+		inv_dai_fmt |= SND_SOC_DAIFMT_CBM_CFS;
+		break;
+	case SND_SOC_DAIFMT_CBS_CFS:
+		inv_dai_fmt |= SND_SOC_DAIFMT_CBM_CFM;
+		break;
+	}
+	for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
+		unsigned int fmt = dai_fmt;
+
+		if (cpu_dai->component->driver->non_legacy_dai_naming)
+			fmt = inv_dai_fmt;
+
+		ret = snd_soc_dai_set_fmt(cpu_dai, fmt);
+		if (ret != 0 && ret != -ENOTSUPP) {
+			dev_warn(cpu_dai->dev,
+				 "ASoC: Failed to set DAI format: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_runtime_set_dai_fmt);
+
+#ifdef CONFIG_DMI
+/*
+ * 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, *product_version, *board;
+
+	if (card->long_name)
+		return 0; /* long name already set by driver or from DMI */
+
+	if (!is_acpi_device_node(card->dev->fwnode))
+		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)) {
+		append_dmi_string(card, product);
+
+		/*
+		 * some vendors like Lenovo may only put a self-explanatory
+		 * name in the product version field
+		 */
+		product_version = dmi_get_system_info(DMI_PRODUCT_VERSION);
+		if (product_version && is_dmi_valid(product_version))
+			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;
+			}
+			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);
+
+	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 err, i;
+
+	for (i = 0; i < num_controls; i++) {
+		const struct snd_kcontrol_new *control = &controls[i];
+
+		err = snd_ctl_add(card, snd_soc_cnew(control, data,
+						     control->name, prefix));
+		if (err < 0) {
+			dev_err(dev, "ASoC: Failed to add %s: %d\n",
+				control->name, err);
+			return err;
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * 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);
+	spin_lock_init(&card->dpcm_lock);
+
+	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
+ *
+ */
+int snd_soc_unregister_card(struct snd_soc_card *card)
+{
+	mutex_lock(&client_mutex);
+	snd_soc_unbind_card(card, true);
+	mutex_unlock(&client_mutex);
+	dev_dbg(card->dev, "ASoC: Unregistered card '%s'\n", card->name);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_unregister_card);
+
+/*
+ * Simplify DAI link configuration by removing ".-1" from device names
+ * and sanitizing names.
+ */
+static char *fmt_single_name(struct device *dev, int *id)
+{
+	const char *devname = dev_name(dev);
+	char *found, *name;
+	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;
+}
+
+/**
+ * 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->non_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;
+
+	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)
+{
+	struct snd_soc_component *component;
+
+	mutex_lock(&client_mutex);
+	while (1) {
+		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, ret;
+
+	num_widgets = of_property_count_strings(np, propname);
+	if (num_widgets < 0) {
+		dev_err(card->dev,
+			"ASoC: Property '%s' does not exist\n",	propname);
+		return -EINVAL;
+	}
+	if (num_widgets & 1) {
+		dev_err(card->dev,
+			"ASoC: Property '%s' length is not even\n", propname);
+		return -EINVAL;
+	}
+
+	num_widgets /= 2;
+	if (!num_widgets) {
+		dev_err(card->dev, "ASoC: Property '%s's length is zero\n",
+			propname);
+		return -EINVAL;
+	}
+
+	widgets = devm_kcalloc(card->dev, num_widgets, sizeof(*widgets),
+			       GFP_KERNEL);
+	if (!widgets) {
+		dev_err(card->dev,
+			"ASoC: Could not allocate memory for widgets\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < num_widgets; i++) {
+		ret = of_property_read_string_index(np, propname,
+			2 * i, &template);
+		if (ret) {
+			dev_err(card->dev,
+				"ASoC: Property '%s' index %d read error:%d\n",
+				propname, 2 * i, ret);
+			return -EINVAL;
+		}
+
+		for (j = 0; j < ARRAY_SIZE(simple_widgets); j++) {
+			if (!strncmp(template, simple_widgets[j].name,
+				     strlen(simple_widgets[j].name))) {
+				widgets[i] = simple_widgets[j];
+				break;
+			}
+		}
+
+		if (j >= ARRAY_SIZE(simple_widgets)) {
+			dev_err(card->dev,
+				"ASoC: DAPM widget '%s' is not supported\n",
+				template);
+			return -EINVAL;
+		}
+
+		ret = of_property_read_string_index(np, propname,
+						    (2 * i) + 1,
+						    &wname);
+		if (ret) {
+			dev_err(card->dev,
+				"ASoC: Property '%s' index %d read error:%d\n",
+				propname, (2 * i) + 1, ret);
+			return -EINVAL;
+		}
+
+		widgets[i].name = wname;
+	}
+
+	card->of_dapm_widgets = widgets;
+	card->num_of_dapm_widgets = num_widgets;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_simple_widgets);
+
+int snd_soc_of_get_slot_mask(struct device_node *np,
+			     const char *prop_name,
+			     unsigned int *mask)
+{
+	u32 val;
+	const __be32 *of_slot_mask = of_get_property(np, prop_name, &val);
+	int i;
+
+	if (!of_slot_mask)
+		return 0;
+	val /= sizeof(u32);
+	for (i = 0; i < val; i++)
+		if (be32_to_cpup(&of_slot_mask[i]))
+			*mask |= (1 << i);
+
+	return val;
+}
+EXPORT_SYMBOL_GPL(snd_soc_of_get_slot_mask);
+
+int snd_soc_of_parse_tdm_slot(struct device_node *np,
+			      unsigned int *tx_mask,
+			      unsigned int *rx_mask,
+			      unsigned int *slots,
+			      unsigned int *slot_width)
+{
+	u32 val;
+	int ret;
+
+	if (tx_mask)
+		snd_soc_of_get_slot_mask(np, "dai-tdm-slot-tx-mask", tx_mask);
+	if (rx_mask)
+		snd_soc_of_get_slot_mask(np, "dai-tdm-slot-rx-mask", rx_mask);
+
+	if (of_property_read_bool(np, "dai-tdm-slot-num")) {
+		ret = of_property_read_u32(np, "dai-tdm-slot-num", &val);
+		if (ret)
+			return ret;
+
+		if (slots)
+			*slots = val;
+	}
+
+	if (of_property_read_bool(np, "dai-tdm-slot-width")) {
+		ret = of_property_read_u32(np, "dai-tdm-slot-width", &val);
+		if (ret)
+			return ret;
+
+		if (slot_width)
+			*slot_width = val;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_of_parse_tdm_slot);
+
+void snd_soc_of_parse_node_prefix(struct device_node *np,
+				  struct snd_soc_codec_conf *codec_conf,
+				  struct device_node *of_node,
+				  const char *propname)
+{
+	const char *str;
+	int ret;
+
+	ret = of_property_read_string(np, propname, &str);
+	if (ret < 0) {
+		/* no prefix is not error */
+		return;
+	}
+
+	codec_conf->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, ret;
+
+	num_routes = of_property_count_strings(np, propname);
+	if (num_routes < 0 || num_routes & 1) {
+		dev_err(card->dev,
+			"ASoC: Property '%s' does not exist or its length is not even\n",
+			propname);
+		return -EINVAL;
+	}
+	num_routes /= 2;
+	if (!num_routes) {
+		dev_err(card->dev, "ASoC: Property '%s's length is zero\n",
+			propname);
+		return -EINVAL;
+	}
+
+	routes = devm_kcalloc(card->dev, num_routes, sizeof(*routes),
+			      GFP_KERNEL);
+	if (!routes) {
+		dev_err(card->dev,
+			"ASoC: Could not allocate DAPM route table\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < num_routes; i++) {
+		ret = of_property_read_string_index(np, propname,
+			2 * i, &routes[i].sink);
+		if (ret) {
+			dev_err(card->dev,
+				"ASoC: Property '%s' index %d could not be read: %d\n",
+				propname, 2 * i, ret);
+			return -EINVAL;
+		}
+		ret = of_property_read_string_index(np, propname,
+			(2 * i) + 1, &routes[i].source);
+		if (ret) {
+			dev_err(card->dev,
+				"ASoC: Property '%s' index %d could not be read: %d\n",
+				propname, (2 * i) + 1, ret);
+			return -EINVAL;
+		}
+	}
+
+	card->num_of_dapm_routes = num_routes;
+	card->of_dapm_routes = routes;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_routing);
+
+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_of_parse_daifmt(struct device_node *np,
+				     const char *prefix,
+				     struct device_node **bitclkmaster,
+				     struct device_node **framemaster)
+{
+	int ret, i;
+	char prop[128];
+	unsigned int format = 0;
+	int bit, frame;
+	const char *str;
+	struct {
+		char *name;
+		unsigned int val;
+	} of_fmt_table[] = {
+		{ "i2s",	SND_SOC_DAIFMT_I2S },
+		{ "right_j",	SND_SOC_DAIFMT_RIGHT_J },
+		{ "left_j",	SND_SOC_DAIFMT_LEFT_J },
+		{ "dsp_a",	SND_SOC_DAIFMT_DSP_A },
+		{ "dsp_b",	SND_SOC_DAIFMT_DSP_B },
+		{ "ac97",	SND_SOC_DAIFMT_AC97 },
+		{ "pdm",	SND_SOC_DAIFMT_PDM},
+		{ "msb",	SND_SOC_DAIFMT_MSB },
+		{ "lsb",	SND_SOC_DAIFMT_LSB },
+	};
+
+	if (!prefix)
+		prefix = "";
+
+	/*
+	 * check "dai-format = xxx"
+	 * or    "[prefix]format = xxx"
+	 * SND_SOC_DAIFMT_FORMAT_MASK area
+	 */
+	ret = of_property_read_string(np, "dai-format", &str);
+	if (ret < 0) {
+		snprintf(prop, sizeof(prop), "%sformat", prefix);
+		ret = of_property_read_string(np, prop, &str);
+	}
+	if (ret == 0) {
+		for (i = 0; i < ARRAY_SIZE(of_fmt_table); i++) {
+			if (strcmp(str, of_fmt_table[i].name) == 0) {
+				format |= of_fmt_table[i].val;
+				break;
+			}
+		}
+	}
+
+	/*
+	 * check "[prefix]continuous-clock"
+	 * SND_SOC_DAIFMT_CLOCK_MASK area
+	 */
+	snprintf(prop, sizeof(prop), "%scontinuous-clock", prefix);
+	if (of_property_read_bool(np, prop))
+		format |= SND_SOC_DAIFMT_CONT;
+	else
+		format |= SND_SOC_DAIFMT_GATED;
+
+	/*
+	 * check "[prefix]bitclock-inversion"
+	 * check "[prefix]frame-inversion"
+	 * SND_SOC_DAIFMT_INV_MASK area
+	 */
+	snprintf(prop, sizeof(prop), "%sbitclock-inversion", prefix);
+	bit = !!of_get_property(np, prop, NULL);
+
+	snprintf(prop, sizeof(prop), "%sframe-inversion", prefix);
+	frame = !!of_get_property(np, prop, NULL);
+
+	switch ((bit << 4) + frame) {
+	case 0x11:
+		format |= SND_SOC_DAIFMT_IB_IF;
+		break;
+	case 0x10:
+		format |= SND_SOC_DAIFMT_IB_NF;
+		break;
+	case 0x01:
+		format |= SND_SOC_DAIFMT_NB_IF;
+		break;
+	default:
+		/* SND_SOC_DAIFMT_NB_NF is default */
+		break;
+	}
+
+	/*
+	 * check "[prefix]bitclock-master"
+	 * check "[prefix]frame-master"
+	 * SND_SOC_DAIFMT_MASTER_MASK area
+	 */
+	snprintf(prop, sizeof(prop), "%sbitclock-master", prefix);
+	bit = !!of_get_property(np, prop, NULL);
+	if (bit && bitclkmaster)
+		*bitclkmaster = of_parse_phandle(np, prop, 0);
+
+	snprintf(prop, sizeof(prop), "%sframe-master", prefix);
+	frame = !!of_get_property(np, prop, NULL);
+	if (frame && framemaster)
+		*framemaster = of_parse_phandle(np, prop, 0);
+
+	switch ((bit << 4) + frame) {
+	case 0x11:
+		format |= SND_SOC_DAIFMT_CBM_CFM;
+		break;
+	case 0x10:
+		format |= SND_SOC_DAIFMT_CBM_CFS;
+		break;
+	case 0x01:
+		format |= SND_SOC_DAIFMT_CBS_CFM;
+		break;
+	default:
+		format |= SND_SOC_DAIFMT_CBS_CFS;
+		break;
+	}
+
+	return format;
+}
+EXPORT_SYMBOL_GPL(snd_soc_of_parse_daifmt);
+
+int snd_soc_get_dai_id(struct device_node *ep)
+{
+	struct snd_soc_component *component;
+	struct snd_soc_dai_link_component dlc;
+	int ret;
+
+	dlc.of_node	= of_graph_get_port_parent(ep);
+	dlc.name	= NULL;
+	/*
+	 * For example HDMI case, HDMI has video/sound port,
+	 * but ALSA SoC needs sound port number only.
+	 * Thus counting HDMI DT port/endpoint doesn't work.
+	 * Then, it should have .of_xlate_dai_id
+	 */
+	ret = -ENOTSUPP;
+	mutex_lock(&client_mutex);
+	component = soc_find_component(&dlc);
+	if (component)
+		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(struct of_phandle_args *args,
+				const char **dai_name)
+{
+	struct snd_soc_component *pos;
+	struct device_node *component_of_node;
+	int ret = -EPROBE_DEFER;
+
+	mutex_lock(&client_mutex);
+	for_each_component(pos) {
+		component_of_node = soc_component_to_node(pos);
+
+		if (component_of_node != args->np || !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);
+
+/*
+ * snd_soc_of_put_dai_link_codecs - Dereference device nodes in the codecs array
+ * @dai_link: DAI link
+ *
+ * Dereference device nodes acquired by snd_soc_of_get_dai_link_codecs().
+ */
+void snd_soc_of_put_dai_link_codecs(struct snd_soc_dai_link *dai_link)
+{
+	struct snd_soc_dai_link_component *component;
+	int index;
+
+	for_each_link_codecs(dai_link, index, component) {
+		if (!component->of_node)
+			break;
+		of_node_put(component->of_node);
+		component->of_node = NULL;
+	}
+}
+EXPORT_SYMBOL_GPL(snd_soc_of_put_dai_link_codecs);
+
+/*
+ * snd_soc_of_get_dai_link_codecs - Parse a list of CODECs in the devicetree
+ * @dev: Card device
+ * @of_node: Device node
+ * @dai_link: DAI link
+ *
+ * Builds an array of CODEC DAI components from the DAI link property
+ * 'sound-dai'.
+ * The array is set in the DAI link and the number of DAIs is set accordingly.
+ * The device nodes in the array (of_node) must be dereferenced by calling
+ * snd_soc_of_put_dai_link_codecs() on @dai_link.
+ *
+ * Returns 0 for success
+ */
+int snd_soc_of_get_dai_link_codecs(struct device *dev,
+				   struct device_node *of_node,
+				   struct snd_soc_dai_link *dai_link)
+{
+	struct of_phandle_args args;
+	struct snd_soc_dai_link_component *component;
+	char *name;
+	int index, num_codecs, ret;
+
+	/* Count the number of CODECs */
+	name = "sound-dai";
+	num_codecs = of_count_phandle_with_args(of_node, name,
+						"#sound-dai-cells");
+	if (num_codecs <= 0) {
+		if (num_codecs == -ENOENT)
+			dev_err(dev, "No 'sound-dai' property\n");
+		else
+			dev_err(dev, "Bad phandle in 'sound-dai'\n");
+		return num_codecs;
+	}
+	component = devm_kcalloc(dev,
+				 num_codecs, sizeof(*component),
+				 GFP_KERNEL);
+	if (!component)
+		return -ENOMEM;
+	dai_link->codecs = component;
+	dai_link->num_codecs = num_codecs;
+
+	/* Parse the list */
+	for_each_link_codecs(dai_link, index, component) {
+		ret = of_parse_phandle_with_args(of_node, name,
+						 "#sound-dai-cells",
+						 index, &args);
+		if (ret)
+			goto err;
+		component->of_node = args.np;
+		ret = snd_soc_get_dai_name(&args, &component->dai_name);
+		if (ret < 0)
+			goto err;
+	}
+	return 0;
+err:
+	snd_soc_of_put_dai_link_codecs(dai_link);
+	dai_link->codecs = NULL;
+	dai_link->num_codecs = 0;
+	return ret;
+}
+EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_link_codecs);
+
+static int __init snd_soc_init(void)
+{
+	int ret;
+
+	snd_soc_debugfs_init();
+	ret = snd_soc_util_init();
+	if (ret)
+		goto err_util_init;
+
+	ret = platform_driver_register(&soc_driver);
+	if (ret)
+		goto err_register;
+	return 0;
+
+err_register:
+	snd_soc_util_exit();
+err_util_init:
+	snd_soc_debugfs_exit();
+	return ret;
+}
+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");