ACPI: EC: Rework flushing of pending work

[linux/fpc-iii.git] / sound / soc / soc-core.c

// SPDX-License-Identifier: GPL-2.0+
//
// soc-core.c  --  ALSA SoC Audio Layer
//
// Copyright 2005 Wolfson Microelectronics PLC.
// Copyright 2005 Openedhand Ltd.
// Copyright (C) 2010 Slimlogic Ltd.
// Copyright (C) 2010 Texas Instruments Inc.
//
// Author: Liam Girdwood <lrg@slimlogic.co.uk>
//         with code, comments and ideas from :-
//         Richard Purdie <richard@openedhand.com>
//
//  TODO:
//   o Add hw rules to enforce rates, etc.
//   o More testing with other codecs/machines.
//   o Add more codecs and platforms to ensure good API coverage.
//   o Support TDM on PCM and I2S

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/bitops.h>
#include <linux/debugfs.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/dmi.h>
#include <sound/core.h>
#include <sound/jack.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dpcm.h>
#include <sound/soc-topology.h>
#include <sound/initval.h>

#define CREATE_TRACE_POINTS
#include <trace/events/asoc.h>

#define NAME_SIZE       32

#ifdef CONFIG_DEBUG_FS
struct dentry *snd_soc_debugfs_root;
EXPORT_SYMBOL_GPL(snd_soc_debugfs_root);
#endif

static DEFINE_MUTEX(client_mutex);
static LIST_HEAD(component_list);
static LIST_HEAD(unbind_card_list);

#define for_each_component(component)                   \
        list_for_each_entry(component, &component_list, list)

/*
 * This is used if driver don't need to have CPU/Codec/Platform
 * dai_link. see soc.h
 */
struct snd_soc_dai_link_component null_dailink_component[0];
EXPORT_SYMBOL_GPL(null_dailink_component);

/*
 * This is a timeout to do a DAPM powerdown after a stream is closed().
 * It can be used to eliminate pops between different playback streams, e.g.
 * between two audio tracks.
 */
static int pmdown_time = 5000;
module_param(pmdown_time, int, 0);
MODULE_PARM_DESC(pmdown_time, "DAPM stream powerdown time (msecs)");

#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 */
};
#endif

static ssize_t pmdown_time_show(struct device *dev,
                                struct device_attribute *attr, char *buf)
{
        struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);

        return sprintf(buf, "%ld\n", rtd->pmdown_time);
}

static ssize_t pmdown_time_set(struct device *dev,
                               struct device_attribute *attr,
                               const char *buf, size_t count)
{
        struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
        int ret;

        ret = kstrtol(buf, 10, &rtd->pmdown_time);
        if (ret)
                return ret;

        return count;
}

static DEVICE_ATTR(pmdown_time, 0644, pmdown_time_show, pmdown_time_set);

static struct attribute *soc_dev_attrs[] = {
        &dev_attr_pmdown_time.attr,
        NULL
};

static umode_t soc_dev_attr_is_visible(struct kobject *kobj,
                                       struct attribute *attr, int idx)
{
        struct device *dev = kobj_to_dev(kobj);
        struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);

        if (attr == &dev_attr_pmdown_time.attr)
                return attr->mode; /* always visible */
        return rtd->num_codecs ? attr->mode : 0; /* enabled only with codec */
}

static const struct attribute_group soc_dapm_dev_group = {
        .attrs = soc_dapm_dev_attrs,
        .is_visible = soc_dev_attr_is_visible,
};

static const struct attribute_group soc_dev_group = {
        .attrs = soc_dev_attrs,
        .is_visible = soc_dev_attr_is_visible,
};

static const struct attribute_group *soc_dev_attr_groups[] = {
        &soc_dapm_dev_group,
        &soc_dev_group,
        NULL
};

#ifdef CONFIG_DEBUG_FS
static void soc_init_component_debugfs(struct snd_soc_component *component)
{
        if (!component->card->debugfs_card_root)
                return;

        if (component->debugfs_prefix) {
                char *name;

                name = kasprintf(GFP_KERNEL, "%s:%s",
                        component->debugfs_prefix, component->name);
                if (name) {
                        component->debugfs_root = debugfs_create_dir(name,
                                component->card->debugfs_card_root);
                        kfree(name);
                }
        } else {
                component->debugfs_root = debugfs_create_dir(component->name,
                                component->card->debugfs_card_root);
        }

        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_rtdcom_add(struct snd_soc_pcm_runtime *rtd,
                              struct snd_soc_component *component)
{
        struct snd_soc_rtdcom_list *rtdcom;

        for_each_rtdcom(rtd, rtdcom) {
                /* already connected */
                if (rtdcom->component == component)
                        return 0;
        }

        rtdcom = kmalloc(sizeof(*rtdcom), GFP_KERNEL);
        if (!rtdcom)
                return -ENOMEM;

        rtdcom->component = component;
        INIT_LIST_HEAD(&rtdcom->list);

        list_add_tail(&rtdcom->list, &rtd->component_list);

        return 0;
}

static void snd_soc_rtdcom_del_all(struct snd_soc_pcm_runtime *rtd)
{
        struct snd_soc_rtdcom_list *rtdcom1, *rtdcom2;

        for_each_rtdcom_safe(rtd, rtdcom1, rtdcom2)
                kfree(rtdcom1);

        INIT_LIST_HEAD(&rtd->component_list);
}

struct snd_soc_component *snd_soc_rtdcom_lookup(struct snd_soc_pcm_runtime *rtd,
                                                const char *driver_name)
{
        struct snd_soc_rtdcom_list *rtdcom;

        if (!driver_name)
                return NULL;

        /*
         * 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_rtdcom(rtd, rtdcom) {
                const char *component_name = rtdcom->component->driver->name;

                if (!component_name)
                        continue;

                if ((component_name == driver_name) ||
                    strcmp(component_name, driver_name) == 0)
                        return rtdcom->component;
        }

        return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_rtdcom_lookup);

struct snd_pcm_substream *snd_soc_get_dai_substream(struct snd_soc_card *card,
                const char *dai_link, int stream)
{
        struct snd_soc_pcm_runtime *rtd;

        for_each_card_rtds(card, rtd) {
                if (rtd->dai_link->no_pcm &&
                        !strcmp(rtd->dai_link->name, dai_link))
                        return rtd->pcm->streams[stream].substream;
        }
        dev_dbg(card->dev, "ASoC: failed to find dai link %s\n", dai_link);
        return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_get_dai_substream);

static const struct snd_soc_ops null_snd_soc_ops;

static struct snd_soc_pcm_runtime *soc_new_pcm_runtime(
        struct snd_soc_card *card, struct snd_soc_dai_link *dai_link)
{
        struct snd_soc_pcm_runtime *rtd;

        rtd = kzalloc(sizeof(struct snd_soc_pcm_runtime), GFP_KERNEL);
        if (!rtd)
                return NULL;

        INIT_LIST_HEAD(&rtd->component_list);
        rtd->card = card;
        rtd->dai_link = dai_link;
        if (!rtd->dai_link->ops)
                rtd->dai_link->ops = &null_snd_soc_ops;

        rtd->codec_dais = kcalloc(dai_link->num_codecs,
                                        sizeof(struct snd_soc_dai *),
                                        GFP_KERNEL);
        if (!rtd->codec_dais) {
                kfree(rtd);
                return NULL;
        }

        return rtd;
}

static void soc_free_pcm_runtime(struct snd_soc_pcm_runtime *rtd)
{
        kfree(rtd->codec_dais);
        snd_soc_rtdcom_del_all(rtd);
        kfree(rtd);
}

static void soc_add_pcm_runtime(struct snd_soc_card *card,
                struct snd_soc_pcm_runtime *rtd)
{
        /* see for_each_card_rtds */
        list_add_tail(&rtd->list, &card->rtd_list);
        rtd->num = card->num_rtd;
        card->num_rtd++;
}

static void soc_remove_pcm_runtimes(struct snd_soc_card *card)
{
        struct snd_soc_pcm_runtime *rtd, *_rtd;

        for_each_card_rtds_safe(card, rtd, _rtd) {
                list_del(&rtd->list);
                soc_free_pcm_runtime(rtd);
        }

        card->num_rtd = 0;
}

struct snd_soc_pcm_runtime *snd_soc_get_pcm_runtime(struct snd_soc_card *card,
                const char *dai_link)
{
        struct snd_soc_pcm_runtime *rtd;

        for_each_card_rtds(card, rtd) {
                if (!strcmp(rtd->dai_link->name, dai_link))
                        return rtd;
        }
        dev_dbg(card->dev, "ASoC: failed to find rtd %s\n", dai_link);
        return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_get_pcm_runtime);

static void snd_soc_flush_all_delayed_work(struct snd_soc_card *card)
{
        struct snd_soc_pcm_runtime *rtd;

        for_each_card_rtds(card, rtd)
                flush_delayed_work(&rtd->delayed_work);
}

#ifdef CONFIG_PM_SLEEP
/* powers down audio subsystem for suspend */
int snd_soc_suspend(struct device *dev)
{
        struct snd_soc_card *card = dev_get_drvdata(dev);
        struct snd_soc_component *component;
        struct snd_soc_pcm_runtime *rtd;
        int i;

        /* If the card is not initialized yet there is nothing to do */
        if (!card->instantiated)
                return 0;

        /*
         * Due to the resume being scheduled into a workqueue we could
         * suspend before that's finished - wait for it to complete.
         */
        snd_power_wait(card->snd_card, SNDRV_CTL_POWER_D0);

        /* we're going to block userspace touching us until resume completes */
        snd_power_change_state(card->snd_card, SNDRV_CTL_POWER_D3hot);

        /* mute any active DACs */
        for_each_card_rtds(card, rtd) {
                struct snd_soc_dai *dai;

                if (rtd->dai_link->ignore_suspend)
                        continue;

                for_each_rtd_codec_dai(rtd, i, dai) {
                        if (dai->playback_active)
                                snd_soc_dai_digital_mute(dai, 1,
                                                SNDRV_PCM_STREAM_PLAYBACK);
                }
        }

        /* suspend all pcms */
        for_each_card_rtds(card, rtd) {
                if (rtd->dai_link->ignore_suspend)
                        continue;

                snd_pcm_suspend_all(rtd->pcm);
        }

        if (card->suspend_pre)
                card->suspend_pre(card);

        for_each_card_rtds(card, rtd) {
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;

                if (rtd->dai_link->ignore_suspend)
                        continue;

                if (!cpu_dai->driver->bus_control)
                        snd_soc_dai_suspend(cpu_dai);
        }

        /* close any waiting streams */
        snd_soc_flush_all_delayed_work(card);

        for_each_card_rtds(card, rtd) {

                if (rtd->dai_link->ignore_suspend)
                        continue;

                snd_soc_dapm_stream_event(rtd,
                                          SNDRV_PCM_STREAM_PLAYBACK,
                                          SND_SOC_DAPM_STREAM_SUSPEND);

                snd_soc_dapm_stream_event(rtd,
                                          SNDRV_PCM_STREAM_CAPTURE,
                                          SND_SOC_DAPM_STREAM_SUSPEND);
        }

        /* Recheck all endpoints too, their state is affected by suspend */
        dapm_mark_endpoints_dirty(card);
        snd_soc_dapm_sync(&card->dapm);

        /* suspend all COMPONENTs */
        for_each_card_components(card, component) {
                struct snd_soc_dapm_context *dapm =
                                snd_soc_component_get_dapm(component);

                /*
                 * If there are paths active then the COMPONENT will be held
                 * with bias _ON and should not be suspended.
                 */
                if (!snd_soc_component_is_suspended(component)) {
                        switch (snd_soc_dapm_get_bias_level(dapm)) {
                        case SND_SOC_BIAS_STANDBY:
                                /*
                                 * If the COMPONENT is capable of idle
                                 * bias off then being in STANDBY
                                 * means it's doing something,
                                 * otherwise fall through.
                                 */
                                if (dapm->idle_bias_off) {
                                        dev_dbg(component->dev,
                                                "ASoC: idle_bias_off CODEC on over suspend\n");
                                        break;
                                }
                                /* fall through */

                        case SND_SOC_BIAS_OFF:
                                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;
                        }
                }
        }

        for_each_card_rtds(card, rtd) {
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;

                if (rtd->dai_link->ignore_suspend)
                        continue;

                if (cpu_dai->driver->bus_control)
                        snd_soc_dai_suspend(cpu_dai);

                /* deactivate pins to sleep state */
                pinctrl_pm_select_sleep_state(cpu_dai->dev);
        }

        if (card->suspend_post)
                card->suspend_post(card);

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_suspend);

/*
 * deferred resume work, so resume can complete before we finished
 * setting our codec back up, which can be very slow on I2C
 */
static void soc_resume_deferred(struct work_struct *work)
{
        struct snd_soc_card *card =
                        container_of(work, struct snd_soc_card,
                                     deferred_resume_work);
        struct snd_soc_pcm_runtime *rtd;
        struct snd_soc_component *component;
        int i;

        /*
         * our power state is still SNDRV_CTL_POWER_D3hot from suspend time,
         * so userspace apps are blocked from touching us
         */

        dev_dbg(card->dev, "ASoC: starting resume work\n");

        /* Bring us up into D2 so that DAPM starts enabling things */
        snd_power_change_state(card->snd_card, SNDRV_CTL_POWER_D2);

        if (card->resume_pre)
                card->resume_pre(card);

        /* resume control bus DAIs */
        for_each_card_rtds(card, rtd) {
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;

                if (rtd->dai_link->ignore_suspend)
                        continue;

                if (cpu_dai->driver->bus_control)
                        snd_soc_dai_resume(cpu_dai);
        }

        for_each_card_components(card, component) {
                if (snd_soc_component_is_suspended(component))
                        snd_soc_component_resume(component);
        }

        for_each_card_rtds(card, rtd) {

                if (rtd->dai_link->ignore_suspend)
                        continue;

                snd_soc_dapm_stream_event(rtd,
                                          SNDRV_PCM_STREAM_PLAYBACK,
                                          SND_SOC_DAPM_STREAM_RESUME);

                snd_soc_dapm_stream_event(rtd,
                                          SNDRV_PCM_STREAM_CAPTURE,
                                          SND_SOC_DAPM_STREAM_RESUME);
        }

        /* unmute any active DACs */
        for_each_card_rtds(card, rtd) {
                struct snd_soc_dai *dai;

                if (rtd->dai_link->ignore_suspend)
                        continue;

                for_each_rtd_codec_dai(rtd, i, dai) {
                        if (dai->playback_active)
                                snd_soc_dai_digital_mute(dai, 0,
                                                SNDRV_PCM_STREAM_PLAYBACK);
                }
        }

        for_each_card_rtds(card, rtd) {
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;

                if (rtd->dai_link->ignore_suspend)
                        continue;

                if (!cpu_dai->driver->bus_control)
                        snd_soc_dai_resume(cpu_dai);
        }

        if (card->resume_post)
                card->resume_post(card);

        dev_dbg(card->dev, "ASoC: resume work completed\n");

        /* Recheck all endpoints too, their state is affected by suspend */
        dapm_mark_endpoints_dirty(card);
        snd_soc_dapm_sync(&card->dapm);

        /* userspace can access us now we are back as we were before */
        snd_power_change_state(card->snd_card, SNDRV_CTL_POWER_D0);
}

/* powers up audio subsystem after a suspend */
int snd_soc_resume(struct device *dev)
{
        struct snd_soc_card *card = dev_get_drvdata(dev);
        bool bus_control = false;
        struct snd_soc_pcm_runtime *rtd;
        struct snd_soc_dai *codec_dai;
        int i;

        /* If the card is not initialized yet there is nothing to do */
        if (!card->instantiated)
                return 0;

        /* activate pins from sleep state */
        for_each_card_rtds(card, rtd) {
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;

                if (cpu_dai->active)
                        pinctrl_pm_select_default_state(cpu_dai->dev);

                for_each_rtd_codec_dai(rtd, i, codec_dai) {
                        if (codec_dai->active)
                                pinctrl_pm_select_default_state(codec_dai->dev);
                }
        }

        /*
         * DAIs that also act as the control bus master might have other drivers
         * hanging off them so need to resume immediately. Other drivers don't
         * have that problem and may take a substantial amount of time to resume
         * due to I/O costs and anti-pop so handle them out of line.
         */
        for_each_card_rtds(card, rtd) {
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;

                bus_control |= cpu_dai->driver->bus_control;
        }
        if (bus_control) {
                dev_dbg(dev, "ASoC: Resuming control bus master immediately\n");
                soc_resume_deferred(&card->deferred_resume_work);
        } else {
                dev_dbg(dev, "ASoC: Scheduling resume work\n");
                if (!schedule_work(&card->deferred_resume_work))
                        dev_err(dev, "ASoC: resume work item may be lost\n");
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_resume);

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 const struct snd_soc_dai_ops null_dai_ops = {
};

static struct device_node
*soc_component_to_node(struct snd_soc_component *component)
{
        struct device_node *of_node;

        of_node = component->dev->of_node;
        if (!of_node && component->dev->parent)
                of_node = component->dev->parent->of_node;

        return of_node;
}

static int snd_soc_is_matching_component(
        const struct snd_soc_dai_link_component *dlc,
        struct snd_soc_component *component)
{
        struct device_node *component_of_node;

        if (!dlc)
                return 0;

        component_of_node = soc_component_to_node(component);

        if (dlc->of_node && component_of_node != dlc->of_node)
                return 0;
        if (dlc->name && strcmp(component->name, dlc->name))
                return 0;

        return 1;
}

static struct snd_soc_component *soc_find_component(
        const struct snd_soc_dai_link_component *dlc)
{
        struct snd_soc_component *component;

        lockdep_assert_held(&client_mutex);

        /*
         * NOTE
         *
         * It returns *1st* found component, but some driver
         * has few components by same of_node/name
         * ex)
         *      CPU component and generic DMAEngine component
         */
        for_each_component(component)
                if (snd_soc_is_matching_component(dlc, component))
                        return component;

        return NULL;
}

/**
 * snd_soc_find_dai - Find a registered DAI
 *
 * @dlc: name of the DAI or the DAI driver and optional component info to match
 *
 * This function will search all registered components and their DAIs to
 * find the DAI of the same name. The component's of_node and name
 * should also match if being specified.
 *
 * Return: pointer of DAI, or NULL if not found.
 */
struct snd_soc_dai *snd_soc_find_dai(
        const struct snd_soc_dai_link_component *dlc)
{
        struct snd_soc_component *component;
        struct snd_soc_dai *dai;

        lockdep_assert_held(&client_mutex);

        /* Find CPU DAI from registered DAIs */
        for_each_component(component) {
                if (!snd_soc_is_matching_component(dlc, component))
                        continue;
                for_each_component_dais(component, dai) {
                        if (dlc->dai_name && strcmp(dai->name, dlc->dai_name)
                            && (!dai->driver->name
                                || strcmp(dai->driver->name, dlc->dai_name)))
                                continue;

                        return dai;
                }
        }

        return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_find_dai);

/**
 * snd_soc_find_dai_link - Find a DAI link
 *
 * @card: soc card
 * @id: DAI link ID to match
 * @name: DAI link name to match, optional
 * @stream_name: DAI link stream name to match, optional
 *
 * This function will search all existing DAI links of the soc card to
 * find the link of the same ID. Since DAI links may not have their
 * unique ID, so name and stream name should also match if being
 * specified.
 *
 * Return: pointer of DAI link, or NULL if not found.
 */
struct snd_soc_dai_link *snd_soc_find_dai_link(struct snd_soc_card *card,
                                               int id, const char *name,
                                               const char *stream_name)
{
        struct snd_soc_dai_link *link;

        lockdep_assert_held(&client_mutex);

        for_each_card_links(card, link) {
                if (link->id != id)
                        continue;

                if (name && (!link->name || strcmp(name, link->name)))
                        continue;

                if (stream_name && (!link->stream_name
                        || strcmp(stream_name, link->stream_name)))
                        continue;

                return link;
        }

        return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_find_dai_link);

static bool soc_is_dai_link_bound(struct snd_soc_card *card,
                struct snd_soc_dai_link *dai_link)
{
        struct snd_soc_pcm_runtime *rtd;

        for_each_card_rtds(card, rtd) {
                if (rtd->dai_link == dai_link)
                        return true;
        }

        return false;
}

static int soc_bind_dai_link(struct snd_soc_card *card,
        struct snd_soc_dai_link *dai_link)
{
        struct snd_soc_pcm_runtime *rtd;
        struct snd_soc_dai_link_component *codec, *platform;
        struct snd_soc_component *component;
        int i;

        if (dai_link->ignore)
                return 0;

        dev_dbg(card->dev, "ASoC: binding %s\n", dai_link->name);

        if (soc_is_dai_link_bound(card, dai_link)) {
                dev_dbg(card->dev, "ASoC: dai link %s already bound\n",
                        dai_link->name);
                return 0;
        }

        rtd = soc_new_pcm_runtime(card, dai_link);
        if (!rtd)
                return -ENOMEM;

        /* FIXME: we need multi CPU support in the future */
        rtd->cpu_dai = snd_soc_find_dai(dai_link->cpus);
        if (!rtd->cpu_dai) {
                dev_info(card->dev, "ASoC: CPU DAI %s not registered\n",
                         dai_link->cpus->dai_name);
                goto _err_defer;
        }
        snd_soc_rtdcom_add(rtd, rtd->cpu_dai->component);

        /* Find CODEC from registered CODECs */
        rtd->num_codecs = dai_link->num_codecs;
        for_each_link_codecs(dai_link, i, codec) {
                rtd->codec_dais[i] = snd_soc_find_dai(codec);
                if (!rtd->codec_dais[i]) {
                        dev_info(card->dev, "ASoC: CODEC DAI %s not registered\n",
                                 codec->dai_name);
                        goto _err_defer;
                }

                snd_soc_rtdcom_add(rtd, rtd->codec_dais[i]->component);
        }

        /* Single codec links expect codec and codec_dai in runtime data */
        rtd->codec_dai = rtd->codec_dais[0];

        /* Find PLATFORM from registered PLATFORMs */
        for_each_link_platforms(dai_link, i, platform) {
                for_each_component(component) {
                        if (!snd_soc_is_matching_component(platform, component))
                                continue;

                        snd_soc_rtdcom_add(rtd, component);
                }
        }

        soc_add_pcm_runtime(card, rtd);
        return 0;

_err_defer:
        soc_free_pcm_runtime(rtd);
        return -EPROBE_DEFER;
}

static void soc_set_of_name_prefix(struct snd_soc_component *component)
{
        struct device_node *of_node = soc_component_to_node(component);
        const char *str;
        int ret;

        ret = of_property_read_string(of_node, "sound-name-prefix", &str);
        if (!ret)
                component->name_prefix = str;
}

static void soc_set_name_prefix(struct snd_soc_card *card,
                                struct snd_soc_component *component)
{
        int i;

        for (i = 0; i < card->num_configs && card->codec_conf; i++) {
                struct snd_soc_codec_conf *map = &card->codec_conf[i];
                struct device_node *of_node = soc_component_to_node(component);

                if (map->of_node && of_node != map->of_node)
                        continue;
                if (map->dev_name && strcmp(component->name, map->dev_name))
                        continue;
                component->name_prefix = map->name_prefix;
                return;
        }

        /*
         * If there is no configuration table or no match in the table,
         * check if a prefix is provided in the node
         */
        soc_set_of_name_prefix(component);
}

static void soc_cleanup_component(struct snd_soc_component *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 void soc_remove_component(struct snd_soc_component *component)
{
        if (!component->card)
                return;

        snd_soc_component_remove(component);

        soc_cleanup_component(component);
}

static int soc_probe_component(struct snd_soc_card *card,
                               struct snd_soc_component *component)
{
        struct snd_soc_dapm_context *dapm =
                snd_soc_component_get_dapm(component);
        struct snd_soc_dai *dai;
        int ret;

        if (!strcmp(component->name, "snd-soc-dummy"))
                return 0;

        if (component->card) {
                if (component->card != card) {
                        dev_err(component->dev,
                                "Trying to bind component to card \"%s\" but is already bound to card \"%s\"\n",
                                card->name, component->card->name);
                        return -ENODEV;
                }
                return 0;
        }

        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);

        /* machine specific init */
        if (component->init) {
                ret = component->init(component);
                if (ret < 0) {
                        dev_err(component->dev,
                                "Failed to do machine specific init %d\n", ret);
                        goto err_probe;
                }
        }

        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)
                goto err_probe;

        /* see for_each_card_components */
        list_add(&component->card_list, &card->component_dev_list);

err_probe:
        if (ret < 0)
                soc_cleanup_component(component);

        return ret;
}

static void soc_remove_dai(struct snd_soc_dai *dai, int order)
{
        int err;

        if (!dai || !dai->probed || !dai->driver ||
            dai->driver->remove_order != order)
                return;

        err = snd_soc_dai_remove(dai);
        if (err < 0)
                dev_err(dai->dev,
                        "ASoC: failed to remove %s: %d\n",
                        dai->name, err);

        dai->probed = 0;
}

static int soc_probe_dai(struct snd_soc_dai *dai, int order)
{
        int ret;

        if (dai->probed ||
            dai->driver->probe_order != order)
                return 0;

        ret = snd_soc_dai_probe(dai);
        if (ret < 0) {
                dev_err(dai->dev, "ASoC: failed to probe DAI %s: %d\n",
                        dai->name, ret);
                return ret;
        }

        dai->probed = 1;

        return 0;
}

static void soc_rtd_free(struct snd_soc_pcm_runtime *rtd); /* remove me */
static void soc_remove_link_dais(struct snd_soc_card *card)
{
        int i;
        struct snd_soc_dai *codec_dai;
        struct snd_soc_pcm_runtime *rtd;
        int order;

        for_each_comp_order(order) {
                for_each_card_rtds(card, rtd) {

                        /* finalize rtd device */
                        soc_rtd_free(rtd);

                        /* remove the CODEC DAI */
                        for_each_rtd_codec_dai(rtd, i, codec_dai)
                                soc_remove_dai(codec_dai, order);

                        soc_remove_dai(rtd->cpu_dai, order);
                }
        }
}

static int soc_probe_link_dais(struct snd_soc_card *card)
{
        struct snd_soc_dai *codec_dai;
        struct snd_soc_pcm_runtime *rtd;
        int i, 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);

                        ret = soc_probe_dai(rtd->cpu_dai, order);
                        if (ret)
                                return ret;

                        /* probe the CODEC DAI */
                        for_each_rtd_codec_dai(rtd, i, codec_dai) {
                                ret = soc_probe_dai(codec_dai, order);
                                if (ret)
                                        return ret;
                        }
                }
        }

        return 0;
}

static void soc_remove_link_components(struct snd_soc_card *card)
{
        struct snd_soc_component *component;
        struct snd_soc_pcm_runtime *rtd;
        struct snd_soc_rtdcom_list *rtdcom;
        int order;

        for_each_comp_order(order) {
                for_each_card_rtds(card, rtd) {
                        for_each_rtdcom(rtd, rtdcom) {
                                component = rtdcom->component;

                                if (component->driver->remove_order != order)
                                        continue;

                                soc_remove_component(component);
                        }
                }
        }
}

static int soc_probe_link_components(struct snd_soc_card *card)
{
        struct snd_soc_component *component;
        struct snd_soc_pcm_runtime *rtd;
        struct snd_soc_rtdcom_list *rtdcom;
        int ret, order;

        for_each_comp_order(order) {
                for_each_card_rtds(card, rtd) {
                        for_each_rtdcom(rtd, rtdcom) {
                                component = rtdcom->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_dai_links(struct snd_soc_card *card)
{
        struct snd_soc_dai_link *link, *_link;

        soc_remove_link_dais(card);

        soc_remove_link_components(card);

        for_each_card_links_safe(card, link, _link) {
                if (link->dobj.type == SND_SOC_DOBJ_DAI_LINK)
                        dev_warn(card->dev, "Topology forgot to remove link %s?\n",
                                link->name);

                list_del(&link->list);
        }
}

static int soc_init_dai_link(struct snd_soc_card *card,
                             struct snd_soc_dai_link *link)
{
        int i;
        struct snd_soc_dai_link_component *codec, *platform;

        for_each_link_codecs(link, i, codec) {
                /*
                 * Codec must be specified by 1 of name or OF node,
                 * not both or neither.
                 */
                if (!!codec->name == !!codec->of_node) {
                        dev_err(card->dev, "ASoC: Neither/both codec name/of_node are set for %s\n",
                                link->name);
                        return -EINVAL;
                }

                /* Codec DAI name must be specified */
                if (!codec->dai_name) {
                        dev_err(card->dev, "ASoC: codec_dai_name not set for %s\n",
                                link->name);
                        return -EINVAL;
                }

                /*
                 * Defer card registration if codec component is not added to
                 * component list.
                 */
                if (!soc_find_component(codec))
                        return -EPROBE_DEFER;
        }

        for_each_link_platforms(link, i, platform) {
                /*
                 * Platform may be specified by either name or OF node, but it
                 * can be left unspecified, then no components will be inserted
                 * in the rtdcom list
                 */
                if (!!platform->name == !!platform->of_node) {
                        dev_err(card->dev,
                                "ASoC: Neither/both platform name/of_node are set for %s\n",
                                link->name);
                        return -EINVAL;
                }

                /*
                 * Defer card registration if platform component is not added to
                 * component list.
                 */
                if (!soc_find_component(platform))
                        return -EPROBE_DEFER;
        }

        /* FIXME */
        if (link->num_cpus > 1) {
                dev_err(card->dev,
                        "ASoC: multi cpu is not yet supported %s\n",
                        link->name);
                return -EINVAL;
        }

        /*
         * CPU device may be specified by either name or OF node, but
         * can be left unspecified, and will be matched based on DAI
         * name alone..
         */
        if (link->cpus->name && link->cpus->of_node) {
                dev_err(card->dev,
                        "ASoC: Neither/both cpu name/of_node are set for %s\n",
                        link->name);
                return -EINVAL;
        }

        /*
         * Defer card registartion if cpu dai component is not added to
         * component list.
         */
        if ((link->cpus->of_node || link->cpus->name) &&
            !soc_find_component(link->cpus))
                return -EPROBE_DEFER;

        /*
         * At least one of CPU DAI name or CPU device name/node must be
         * specified
         */
        if (!link->cpus->dai_name &&
            !(link->cpus->name || link->cpus->of_node)) {
                dev_err(card->dev,
                        "ASoC: Neither cpu_dai_name nor cpu_name/of_node are set for %s\n",
                        link->name);
                return -EINVAL;
        }

        return 0;
}

void snd_soc_disconnect_sync(struct device *dev)
{
        struct snd_soc_component *component =
                        snd_soc_lookup_component(dev, NULL);

        if (!component || !component->card)
                return;

        snd_card_disconnect_sync(component->card->snd_card);
}
EXPORT_SYMBOL_GPL(snd_soc_disconnect_sync);

/**
 * snd_soc_add_dai_link - Add a DAI link dynamically
 * @card: The ASoC card to which the DAI link is added
 * @dai_link: The new DAI link to add
 *
 * This function adds a DAI link to the ASoC card's link list.
 *
 * Note: Topology can use this API to add DAI links when probing the
 * topology component. And machine drivers can still define static
 * DAI links in dai_link array.
 */
int snd_soc_add_dai_link(struct snd_soc_card *card,
                struct snd_soc_dai_link *dai_link)
{
        if (dai_link->dobj.type
            && dai_link->dobj.type != SND_SOC_DOBJ_DAI_LINK) {
                dev_err(card->dev, "Invalid dai link type %d\n",
                        dai_link->dobj.type);
                return -EINVAL;
        }

        lockdep_assert_held(&client_mutex);
        /*
         * Notify the machine driver for extra initialization
         * on the link created by topology.
         */
        if (dai_link->dobj.type && card->add_dai_link)
                card->add_dai_link(card, dai_link);

        /* see for_each_card_links */
        list_add_tail(&dai_link->list, &card->dai_link_list);

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_add_dai_link);

/**
 * snd_soc_remove_dai_link - Remove a DAI link from the list
 * @card: The ASoC card that owns the link
 * @dai_link: The DAI link to remove
 *
 * This function removes a DAI link from the ASoC card's link list.
 *
 * For DAI links previously added by topology, topology should
 * remove them by using the dobj embedded in the link.
 */
void snd_soc_remove_dai_link(struct snd_soc_card *card,
                             struct snd_soc_dai_link *dai_link)
{
        if (dai_link->dobj.type
            && dai_link->dobj.type != SND_SOC_DOBJ_DAI_LINK) {
                dev_err(card->dev, "Invalid dai link type %d\n",
                        dai_link->dobj.type);
                return;
        }

        lockdep_assert_held(&client_mutex);
        /*
         * Notify the machine driver for extra destruction
         * on the link created by topology.
         */
        if (dai_link->dobj.type && card->remove_dai_link)
                card->remove_dai_link(card, dai_link);

        list_del(&dai_link->list);
}
EXPORT_SYMBOL_GPL(snd_soc_remove_dai_link);

static void soc_rtd_free(struct snd_soc_pcm_runtime *rtd)
{
        if (rtd->dev_registered) {
                /* we don't need to call kfree() for rtd->dev */
                device_unregister(rtd->dev);
                rtd->dev_registered = 0;
        }
}

static void soc_rtd_release(struct device *dev)
{
        kfree(dev);
}

static int soc_rtd_init(struct snd_soc_pcm_runtime *rtd, const char *name)
{
        int ret = 0;

        /* register the rtd device */
        rtd->dev = kzalloc(sizeof(struct device), GFP_KERNEL);
        if (!rtd->dev)
                return -ENOMEM;
        rtd->dev->parent = rtd->card->dev;
        rtd->dev->release = soc_rtd_release;
        rtd->dev->groups = soc_dev_attr_groups;
        dev_set_name(rtd->dev, "%s", name);
        dev_set_drvdata(rtd->dev, rtd);
        INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients);
        INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_CAPTURE].be_clients);
        INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_PLAYBACK].fe_clients);
        INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_CAPTURE].fe_clients);
        ret = device_register(rtd->dev);
        if (ret < 0) {
                /* calling put_device() here to free the rtd->dev */
                put_device(rtd->dev);
                dev_err(rtd->card->dev,
                        "ASoC: failed to register runtime device: %d\n", ret);
                return ret;
        }
        rtd->dev_registered = 1;
        return 0;
}

static int soc_link_dai_pcm_new(struct snd_soc_dai **dais, int num_dais,
                                struct snd_soc_pcm_runtime *rtd)
{
        int i, ret = 0;

        for (i = 0; i < num_dais; ++i) {
                struct snd_soc_dai_driver *drv = dais[i]->driver;

                if (drv->pcm_new)
                        ret = drv->pcm_new(rtd, dais[i]);
                if (ret < 0) {
                        dev_err(dais[i]->dev,
                                "ASoC: Failed to bind %s with pcm device\n",
                                dais[i]->name);
                        return ret;
                }
        }

        return 0;
}

static int soc_link_init(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 = rtd->cpu_dai;
        struct snd_soc_rtdcom_list *rtdcom;
        struct snd_soc_component *component;
        int ret, num;

        /* set default power off timeout */
        rtd->pmdown_time = pmdown_time;

        /* do machine specific initialization */
        if (dai_link->init) {
                ret = dai_link->init(rtd);
                if (ret < 0) {
                        dev_err(card->dev, "ASoC: failed to init %s: %d\n",
                                dai_link->name, ret);
                        return ret;
                }
        }

        if (dai_link->dai_fmt) {
                ret = snd_soc_runtime_set_dai_fmt(rtd, dai_link->dai_fmt);
                if (ret)
                        return ret;
        }

        ret = soc_rtd_init(rtd, dai_link->name);
        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_rtdcom(rtd, rtdcom) {
                component = rtdcom->component;

                if (!component->driver->use_dai_pcm_id)
                        continue;

                if (rtd->dai_link->no_pcm)
                        num += component->driver->be_pcm_base;
                else
                        num = rtd->dai_link->id;
        }

        /* 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;
        }
        ret = soc_link_dai_pcm_new(&cpu_dai, 1, rtd);
        if (ret < 0)
                return ret;
        ret = soc_link_dai_pcm_new(rtd->codec_dais,
                                   rtd->num_codecs, rtd);
        return ret;
}

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) {
                component->init = 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;

                component->init = aux->init;
                /* 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 *comp;
        int order;
        int ret;

        for_each_comp_order(order) {
                for_each_card_auxs(card, comp) {
                        if (comp->driver->probe_order == order) {
                                ret = soc_probe_component(card, comp);
                                if (ret < 0) {
                                        dev_err(card->dev,
                                                "ASoC: failed to probe aux component %s %d\n",
                                                comp->name, ret);
                                        return ret;
                                }
                        }
                }
        }

        return 0;
}

static void soc_remove_aux_devices(struct snd_soc_card *card)
{
        struct snd_soc_component *comp, *_comp;
        int order;

        for_each_comp_order(order) {
                for_each_card_auxs_safe(card, comp, _comp) {
                        if (comp->driver->remove_order == order)
                                soc_remove_component(comp);
                }
        }
}

/**
 * snd_soc_runtime_set_dai_fmt() - Change DAI link format for a ASoC runtime
 * @rtd: The runtime for which the DAI link format should be changed
 * @dai_fmt: The new DAI link format
 *
 * This function updates the DAI link format for all DAIs connected to the DAI
 * link for the specified runtime.
 *
 * Note: For setups with a static format set the dai_fmt field in the
 * corresponding snd_dai_link struct instead of using this function.
 *
 * Returns 0 on success, otherwise a negative error code.
 */
int snd_soc_runtime_set_dai_fmt(struct snd_soc_pcm_runtime *rtd,
        unsigned int dai_fmt)
{
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        struct snd_soc_dai *codec_dai;
        unsigned int i;
        int ret;

        for_each_rtd_codec_dai(rtd, i, codec_dai) {
                ret = snd_soc_dai_set_fmt(codec_dai, dai_fmt);
                if (ret != 0 && ret != -ENOTSUPP) {
                        dev_warn(codec_dai->dev,
                                 "ASoC: Failed to set DAI format: %d\n", ret);
                        return ret;
                }
        }

        /*
         * Flip the polarity for the "CPU" end of a CODEC<->CODEC link
         * the component which has non_legacy_dai_naming is Codec
         */
        if (cpu_dai->component->driver->non_legacy_dai_naming) {
                unsigned int inv_dai_fmt;

                inv_dai_fmt = dai_fmt & ~SND_SOC_DAIFMT_MASTER_MASK;
                switch (dai_fmt & SND_SOC_DAIFMT_MASTER_MASK) {
                case SND_SOC_DAIFMT_CBM_CFM:
                        inv_dai_fmt |= SND_SOC_DAIFMT_CBS_CFS;
                        break;
                case SND_SOC_DAIFMT_CBM_CFS:
                        inv_dai_fmt |= SND_SOC_DAIFMT_CBS_CFM;
                        break;
                case SND_SOC_DAIFMT_CBS_CFM:
                        inv_dai_fmt |= SND_SOC_DAIFMT_CBM_CFS;
                        break;
                case SND_SOC_DAIFMT_CBS_CFS:
                        inv_dai_fmt |= SND_SOC_DAIFMT_CBM_CFM;
                        break;
                }

                dai_fmt = inv_dai_fmt;
        }

        ret = snd_soc_dai_set_fmt(cpu_dai, dai_fmt);
        if (ret != 0 && ret != -ENOTSUPP) {
                dev_warn(cpu_dai->dev,
                         "ASoC: Failed to set DAI format: %d\n", ret);
                return ret;
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_runtime_set_dai_fmt);

#ifdef CONFIG_DMI
/*
 * Trim special characters, and replace '-' with '_' since '-' is used to
 * separate different DMI fields in the card long name. Only number and
 * alphabet characters and a few separator characters are kept.
 */
static void cleanup_dmi_name(char *name)
{
        int i, j = 0;

        for (i = 0; name[i]; i++) {
                if (isalnum(name[i]) || (name[i] == '.')
                    || (name[i] == '_'))
                        name[j++] = name[i];
                else if (name[i] == '-')
                        name[j++] = '_';
        }

        name[j] = '\0';
}

/*
 * Check if a DMI field is valid, i.e. not containing any string
 * in the black list.
 */
static int is_dmi_valid(const char *field)
{
        int i = 0;

        while (dmi_blacklist[i]) {
                if (strstr(field, dmi_blacklist[i]))
                        return 0;
                i++;
        }

        return 1;
}

/**
 * snd_soc_set_dmi_name() - Register DMI names to card
 * @card: The card to register DMI names
 * @flavour: The flavour "differentiator" for the card amongst its peers.
 *
 * An Intel machine driver may be used by many different devices but are
 * difficult for userspace to differentiate, since machine drivers ususally
 * use their own name as the card short name and leave the card long name
 * blank. To differentiate such devices and fix bugs due to lack of
 * device-specific configurations, this function allows DMI info to be used
 * as the sound card long name, in the format of
 * "vendor-product-version-board"
 * (Character '-' is used to separate different DMI fields here).
 * This will help the user space to load the device-specific Use Case Manager
 * (UCM) configurations for the card.
 *
 * Possible card long names may be:
 * DellInc.-XPS139343-01-0310JH
 * ASUSTeKCOMPUTERINC.-T100TA-1.0-T100TA
 * Circuitco-MinnowboardMaxD0PLATFORM-D0-MinnowBoardMAX
 *
 * This function also supports flavoring the card longname to provide
 * the extra differentiation, like "vendor-product-version-board-flavor".
 *
 * We only keep number and alphabet characters and a few separator characters
 * in the card long name since UCM in the user space uses the card long names
 * as card configuration directory names and AudoConf cannot support special
 * charactors like SPACE.
 *
 * Returns 0 on success, otherwise a negative error code.
 */
int snd_soc_set_dmi_name(struct snd_soc_card *card, const char *flavour)
{
        const char *vendor, *product, *product_version, *board;
        size_t longname_buf_size = sizeof(card->snd_card->longname);
        size_t len;

        if (card->long_name)
                return 0; /* long name already set by driver or from DMI */

        /* make up dmi long name as: vendor.product.version.board */
        vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
        if (!vendor || !is_dmi_valid(vendor)) {
                dev_warn(card->dev, "ASoC: no DMI vendor name!\n");
                return 0;
        }

        snprintf(card->dmi_longname, sizeof(card->snd_card->longname),
                         "%s", vendor);
        cleanup_dmi_name(card->dmi_longname);

        product = dmi_get_system_info(DMI_PRODUCT_NAME);
        if (product && is_dmi_valid(product)) {
                len = strlen(card->dmi_longname);
                snprintf(card->dmi_longname + len,
                         longname_buf_size - len,
                         "-%s", product);

                len++;  /* skip the separator "-" */
                if (len < longname_buf_size)
                        cleanup_dmi_name(card->dmi_longname + len);

                /*
                 * some vendors like Lenovo may only put a self-explanatory
                 * name in the product version field
                 */
                product_version = dmi_get_system_info(DMI_PRODUCT_VERSION);
                if (product_version && is_dmi_valid(product_version)) {
                        len = strlen(card->dmi_longname);
                        snprintf(card->dmi_longname + len,
                                 longname_buf_size - len,
                                 "-%s", product_version);

                        len++;
                        if (len < longname_buf_size)
                                cleanup_dmi_name(card->dmi_longname + len);
                }
        }

        board = dmi_get_system_info(DMI_BOARD_NAME);
        if (board && is_dmi_valid(board)) {
                len = strlen(card->dmi_longname);
                snprintf(card->dmi_longname + len,
                         longname_buf_size - len,
                         "-%s", board);

                len++;
                if (len < longname_buf_size)
                        cleanup_dmi_name(card->dmi_longname + len);
        } else if (!product) {
                /* fall back to using legacy name */
                dev_warn(card->dev, "ASoC: no DMI board/product name!\n");
                return 0;
        }

        /* Add flavour to dmi long name */
        if (flavour) {
                len = strlen(card->dmi_longname);
                snprintf(card->dmi_longname + len,
                         longname_buf_size - len,
                         "-%s", flavour);

                len++;
                if (len < longname_buf_size)
                        cleanup_dmi_name(card->dmi_longname + len);
        }

        /* set the card long name */
        card->long_name = card->dmi_longname;

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_set_dmi_name);
#endif /* CONFIG_DMI */

static void soc_check_tplg_fes(struct snd_soc_card *card)
{
        struct snd_soc_component *component;
        const struct snd_soc_component_driver *comp_drv;
        struct snd_soc_dai_link *dai_link;
        int i;

        for_each_component(component) {

                /* does this component override FEs ? */
                if (!component->driver->ignore_machine)
                        continue;

                /* for this machine ? */
                if (!strcmp(component->driver->ignore_machine,
                            card->dev->driver->name))
                        goto match;
                if (strcmp(component->driver->ignore_machine,
                           dev_name(card->dev)))
                        continue;
match:
                /* machine matches, so override the rtd data */
                for_each_card_prelinks(card, i, dai_link) {

                        /* ignore this FE */
                        if (dai_link->dynamic) {
                                dai_link->ignore = true;
                                continue;
                        }

                        dev_info(card->dev, "info: override FE DAI link %s\n",
                                 card->dai_link[i].name);

                        /* override platform component */
                        if (!dai_link->platforms) {
                                dev_err(card->dev, "init platform error");
                                continue;
                        }
                        dai_link->platforms->name = component->name;

                        /* convert non BE into BE */
                        dai_link->no_pcm = 1;

                        /* override any BE fixups */
                        dai_link->be_hw_params_fixup =
                                component->driver->be_hw_params_fixup;

                        /*
                         * most BE links don't set stream name, so set it to
                         * dai link name if it's NULL to help bind widgets.
                         */
                        if (!dai_link->stream_name)
                                dai_link->stream_name = dai_link->name;
                }

                /* Inform userspace we are using alternate topology */
                if (component->driver->topology_name_prefix) {

                        /* topology shortname created? */
                        if (!card->topology_shortname_created) {
                                comp_drv = component->driver;

                                snprintf(card->topology_shortname, 32, "%s-%s",
                                         comp_drv->topology_name_prefix,
                                         card->name);
                                card->topology_shortname_created = true;
                        }

                        /* use topology shortname */
                        card->name = card->topology_shortname;
                }
        }
}

static void soc_cleanup_card_resources(struct snd_soc_card *card)
{
        /* free the ALSA card at first; this syncs with pending operations */
        if (card->snd_card) {
                snd_card_free(card->snd_card);
                card->snd_card = NULL;
        }

        /* remove and free each DAI */
        soc_remove_dai_links(card);
        soc_remove_pcm_runtimes(card);

        /* remove auxiliary devices */
        soc_remove_aux_devices(card);
        soc_unbind_aux_dev(card);

        snd_soc_dapm_free(&card->dapm);
        soc_cleanup_card_debugfs(card);

        /* remove the card */
        if (card->remove)
                card->remove(card);
}

static int snd_soc_instantiate_card(struct snd_soc_card *card)
{
        struct snd_soc_pcm_runtime *rtd;
        struct snd_soc_dai_link *dai_link;
        int ret, i;

        mutex_lock(&client_mutex);
        for_each_card_prelinks(card, i, dai_link) {
                ret = soc_init_dai_link(card, dai_link);
                if (ret) {
                        dev_err(card->dev, "ASoC: failed to init link %s: %d\n",
                                dai_link->name, ret);
                        mutex_unlock(&client_mutex);
                        return ret;
                }
        }
        mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_INIT);

        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 DAIs */
        for_each_card_prelinks(card, i, dai_link) {
                ret = soc_bind_dai_link(card, dai_link);
                if (ret != 0)
                        goto probe_end;
        }

        /* bind aux_devs too */
        ret = soc_bind_aux_dev(card);
        if (ret < 0)
                goto probe_end;

        /* add predefined DAI links to the list */
        for_each_card_prelinks(card, i, dai_link) {
                ret = snd_soc_add_dai_link(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 */
        if (card->probe) {
                ret = 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)
                goto probe_end;

        /*
         * Find new DAI links added during probing components and bind them.
         * Components with topology may bring new DAIs and DAI links.
         */
        for_each_card_links(card, dai_link) {
                if (soc_is_dai_link_bound(card, dai_link))
                        continue;

                ret = soc_init_dai_link(card, dai_link);
                if (ret)
                        goto probe_end;
                ret = soc_bind_dai_link(card, dai_link);
                if (ret)
                        goto probe_end;
        }

        /* probe all DAI links on this card */
        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)
                soc_link_init(card, rtd);

        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)
                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);

        snprintf(card->snd_card->shortname, sizeof(card->snd_card->shortname),
                 "%s", card->name);
        snprintf(card->snd_card->longname, sizeof(card->snd_card->longname),
                 "%s", card->long_name ? card->long_name : card->name);
        snprintf(card->snd_card->driver, sizeof(card->snd_card->driver),
                 "%s", card->driver_name ? card->driver_name : card->name);
        for (i = 0; i < ARRAY_SIZE(card->snd_card->driver); i++) {
                switch (card->snd_card->driver[i]) {
                case '_':
                case '-':
                case '\0':
                        break;
                default:
                        if (!isalnum(card->snd_card->driver[i]))
                                card->snd_card->driver[i] = '_';
                        break;
                }
        }

        if (card->late_probe) {
                ret = card->late_probe(card);
                if (ret < 0) {
                        dev_err(card->dev, "ASoC: %s late_probe() failed: %d\n",
                                card->name, ret);
                        goto probe_end;
                }
        }

        snd_soc_dapm_new_widgets(card);

        ret = snd_card_register(card->snd_card);
        if (ret < 0) {
                dev_err(card->dev, "ASoC: failed to register soundcard %d\n",
                                ret);
                goto probe_end;
        }

        card->instantiated = 1;
        dapm_mark_endpoints_dirty(card);
        snd_soc_dapm_sync(&card->dapm);

probe_end:
        if (ret < 0)
                soc_cleanup_card_resources(card);

        mutex_unlock(&card->mutex);
        mutex_unlock(&client_mutex);

        return ret;
}

/* probes a new socdev */
static int soc_probe(struct platform_device *pdev)
{
        struct snd_soc_card *card = platform_get_drvdata(pdev);

        /*
         * no card, so machine driver should be registering card
         * we should not be here in that case so ret error
         */
        if (!card)
                return -EINVAL;

        dev_warn(&pdev->dev,
                 "ASoC: machine %s should use snd_soc_register_card()\n",
                 card->name);

        /* Bodge while we unpick instantiation */
        card->dev = &pdev->dev;

        return snd_soc_register_card(card);
}

/* removes a socdev */
static int soc_remove(struct platform_device *pdev)
{
        struct snd_soc_card *card = platform_get_drvdata(pdev);

        snd_soc_unregister_card(card);
        return 0;
}

int snd_soc_poweroff(struct device *dev)
{
        struct snd_soc_card *card = dev_get_drvdata(dev);
        struct snd_soc_pcm_runtime *rtd;

        if (!card->instantiated)
                return 0;

        /*
         * Flush out pmdown_time work - we actually do want to run it
         * now, we're shutting down so no imminent restart.
         */
        snd_soc_flush_all_delayed_work(card);

        snd_soc_dapm_shutdown(card);

        /* deactivate pins to sleep state */
        for_each_card_rtds(card, rtd) {
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
                struct snd_soc_dai *codec_dai;
                int i;

                pinctrl_pm_select_sleep_state(cpu_dai->dev);
                for_each_rtd_codec_dai(rtd, i, codec_dai) {
                        pinctrl_pm_select_sleep_state(codec_dai->dev);
                }
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_poweroff);

const struct dev_pm_ops snd_soc_pm_ops = {
        .suspend = snd_soc_suspend,
        .resume = snd_soc_resume,
        .freeze = snd_soc_suspend,
        .thaw = snd_soc_resume,
        .poweroff = snd_soc_poweroff,
        .restore = snd_soc_resume,
};
EXPORT_SYMBOL_GPL(snd_soc_pm_ops);

/* ASoC platform driver */
static struct platform_driver soc_driver = {
        .driver         = {
                .name           = "soc-audio",
                .pm             = &snd_soc_pm_ops,
        },
        .probe          = soc_probe,
        .remove         = soc_remove,
};

/**
 * snd_soc_cnew - create new control
 * @_template: control template
 * @data: control private data
 * @long_name: control long name
 * @prefix: control name prefix
 *
 * Create a new mixer control from a template control.
 *
 * Returns 0 for success, else error.
 */
struct snd_kcontrol *snd_soc_cnew(const struct snd_kcontrol_new *_template,
                                  void *data, const char *long_name,
                                  const char *prefix)
{
        struct snd_kcontrol_new template;
        struct snd_kcontrol *kcontrol;
        char *name = NULL;

        memcpy(&template, _template, sizeof(template));
        template.index = 0;

        if (!long_name)
                long_name = template.name;

        if (prefix) {
                name = kasprintf(GFP_KERNEL, "%s %s", prefix, long_name);
                if (!name)
                        return NULL;

                template.name = name;
        } else {
                template.name = long_name;
        }

        kcontrol = snd_ctl_new1(&template, data);

        kfree(name);

        return kcontrol;
}
EXPORT_SYMBOL_GPL(snd_soc_cnew);

static int snd_soc_add_controls(struct snd_card *card, struct device *dev,
        const struct snd_kcontrol_new *controls, int num_controls,
        const char *prefix, void *data)
{
        int err, i;

        for (i = 0; i < num_controls; i++) {
                const struct snd_kcontrol_new *control = &controls[i];

                err = snd_ctl_add(card, snd_soc_cnew(control, data,
                                                     control->name, prefix));
                if (err < 0) {
                        dev_err(dev, "ASoC: Failed to add %s: %d\n",
                                control->name, err);
                        return err;
                }
        }

        return 0;
}

struct snd_kcontrol *snd_soc_card_get_kcontrol(struct snd_soc_card *soc_card,
                                               const char *name)
{
        struct snd_card *card = soc_card->snd_card;
        struct snd_kcontrol *kctl;

        if (unlikely(!name))
                return NULL;

        list_for_each_entry(kctl, &card->controls, list)
                if (!strncmp(kctl->id.name, name, sizeof(kctl->id.name)))
                        return kctl;
        return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_card_get_kcontrol);

/**
 * snd_soc_add_component_controls - Add an array of controls to a component.
 *
 * @component: Component to add controls to
 * @controls: Array of controls to add
 * @num_controls: Number of elements in the array
 *
 * Return: 0 for success, else error.
 */
int snd_soc_add_component_controls(struct snd_soc_component *component,
        const struct snd_kcontrol_new *controls, unsigned int num_controls)
{
        struct snd_card *card = component->card->snd_card;

        return snd_soc_add_controls(card, component->dev, controls,
                        num_controls, component->name_prefix, component);
}
EXPORT_SYMBOL_GPL(snd_soc_add_component_controls);

/**
 * snd_soc_add_card_controls - add an array of controls to a SoC card.
 * Convenience function to add a list of controls.
 *
 * @soc_card: SoC card to add controls to
 * @controls: array of controls to add
 * @num_controls: number of elements in the array
 *
 * Return 0 for success, else error.
 */
int snd_soc_add_card_controls(struct snd_soc_card *soc_card,
        const struct snd_kcontrol_new *controls, int num_controls)
{
        struct snd_card *card = soc_card->snd_card;

        return snd_soc_add_controls(card, soc_card->dev, controls, num_controls,
                        NULL, soc_card);
}
EXPORT_SYMBOL_GPL(snd_soc_add_card_controls);

/**
 * snd_soc_add_dai_controls - add an array of controls to a DAI.
 * Convienience function to add a list of controls.
 *
 * @dai: DAI to add controls to
 * @controls: array of controls to add
 * @num_controls: number of elements in the array
 *
 * Return 0 for success, else error.
 */
int snd_soc_add_dai_controls(struct snd_soc_dai *dai,
        const struct snd_kcontrol_new *controls, int num_controls)
{
        struct snd_card *card = dai->component->card->snd_card;

        return snd_soc_add_controls(card, dai->dev, controls, num_controls,
                        NULL, dai);
}
EXPORT_SYMBOL_GPL(snd_soc_add_dai_controls);

static int snd_soc_bind_card(struct snd_soc_card *card)
{
        struct snd_soc_pcm_runtime *rtd;
        int ret;

        ret = snd_soc_instantiate_card(card);
        if (ret != 0)
                return ret;

        /* deactivate pins to sleep state */
        for_each_card_rtds(card, rtd) {
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
                struct snd_soc_dai *codec_dai;
                int j;

                for_each_rtd_codec_dai(rtd, j, codec_dai) {
                        if (!codec_dai->active)
                                pinctrl_pm_select_sleep_state(codec_dai->dev);
                }

                if (!cpu_dai->active)
                        pinctrl_pm_select_sleep_state(cpu_dai->dev);
        }

        return ret;
}

/**
 * snd_soc_register_card - Register a card with the ASoC core
 *
 * @card: Card to register
 *
 */
int snd_soc_register_card(struct snd_soc_card *card)
{
        if (!card->name || !card->dev)
                return -EINVAL;

        dev_set_drvdata(card->dev, card);

        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->dai_link_list);
        INIT_LIST_HEAD(&card->rtd_list);
        INIT_LIST_HEAD(&card->dapm_dirty);
        INIT_LIST_HEAD(&card->dobj_list);

        card->num_rtd = 0;
        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);

static void snd_soc_unbind_card(struct snd_soc_card *card, bool unregister)
{
        if (card->instantiated) {
                card->instantiated = false;
                snd_soc_dapm_shutdown(card);
                snd_soc_flush_all_delayed_work(card);

                /* remove all components used by DAI links on this card */
                soc_remove_link_components(card);

                soc_cleanup_card_resources(card);
                if (!unregister)
                        list_add(&card->list, &unbind_card_list);
        } else {
                if (unregister)
                        list_del(&card->list);
        }
}

/**
 * snd_soc_unregister_card - Unregister a card with the ASoC core
 *
 * @card: Card to unregister
 *
 */
int snd_soc_unregister_card(struct snd_soc_card *card)
{
        mutex_lock(&client_mutex);
        snd_soc_unbind_card(card, true);
        mutex_unlock(&client_mutex);
        dev_dbg(card->dev, "ASoC: Unregistered card '%s'\n", card->name);

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_card);

/*
 * Simplify DAI link configuration by removing ".-1" from device names
 * and sanitizing names.
 */
static char *fmt_single_name(struct device *dev, int *id)
{
        char *found, name[NAME_SIZE];
        int id1, id2;

        if (dev_name(dev) == NULL)
                return NULL;

        strlcpy(name, dev_name(dev), NAME_SIZE);

        /* are we a "%s.%d" name (platform and SPI components) */
        found = strstr(name, dev->driver->name);
        if (found) {
                /* get ID */
                if (sscanf(&found[strlen(dev->driver->name)], ".%d", id) == 1) {

                        /* discard ID from name if ID == -1 */
                        if (*id == -1)
                                found[strlen(dev->driver->name)] = '\0';
                }

        } else {
                /* I2C component devices are named "bus-addr" */
                if (sscanf(name, "%x-%x", &id1, &id2) == 2) {
                        char tmp[NAME_SIZE];

                        /* create unique ID number from I2C addr and bus */
                        *id = ((id1 & 0xffff) << 16) + id2;

                        /* sanitize component name for DAI link creation */
                        snprintf(tmp, NAME_SIZE, "%s.%s", dev->driver->name,
                                 name);
                        strlcpy(name, tmp, NAME_SIZE);
                } else
                        *id = 0;
        }

        return kstrdup(name, GFP_KERNEL);
}

/*
 * Simplify DAI link naming for single devices with multiple DAIs by removing
 * any ".-1" and using the DAI name (instead of device name).
 */
static inline char *fmt_multiple_name(struct device *dev,
                struct snd_soc_dai_driver *dai_drv)
{
        if (dai_drv->name == NULL) {
                dev_err(dev,
                        "ASoC: error - multiple DAI %s registered with no name\n",
                        dev_name(dev));
                return NULL;
        }

        return kstrdup(dai_drv->name, GFP_KERNEL);
}

/**
 * snd_soc_unregister_dai - Unregister DAIs from the ASoC core
 *
 * @component: The component for which the DAIs should be unregistered
 */
static void snd_soc_unregister_dais(struct snd_soc_component *component)
{
        struct snd_soc_dai *dai, *_dai;

        for_each_component_dais_safe(component, dai, _dai) {
                dev_dbg(component->dev, "ASoC: Unregistered DAI '%s'\n",
                        dai->name);
                list_del(&dai->list);
                kfree(dai->name);
                kfree(dai);
        }
}

/* Create a DAI and add it to the component's DAI list */
static struct snd_soc_dai *soc_add_dai(struct snd_soc_component *component,
        struct snd_soc_dai_driver *dai_drv,
        bool legacy_dai_naming)
{
        struct device *dev = component->dev;
        struct snd_soc_dai *dai;

        dev_dbg(dev, "ASoC: dynamically register DAI %s\n", dev_name(dev));

        dai = kzalloc(sizeof(struct snd_soc_dai), GFP_KERNEL);
        if (dai == NULL)
                return NULL;

        /*
         * Back in the old days when we still had component-less DAIs,
         * instead of having a static name, component-less DAIs would
         * inherit the name of the parent device so it is possible to
         * register multiple instances of the DAI. We still need to keep
         * the same naming style even though those DAIs are not
         * component-less anymore.
         */
        if (legacy_dai_naming &&
            (dai_drv->id == 0 || dai_drv->name == NULL)) {
                dai->name = fmt_single_name(dev, &dai->id);
        } else {
                dai->name = fmt_multiple_name(dev, dai_drv);
                if (dai_drv->id)
                        dai->id = dai_drv->id;
                else
                        dai->id = component->num_dai;
        }
        if (dai->name == NULL) {
                kfree(dai);
                return NULL;
        }

        dai->component = component;
        dai->dev = dev;
        dai->driver = dai_drv;
        if (!dai->driver->ops)
                dai->driver->ops = &null_dai_ops;

        /* see for_each_component_dais */
        list_add_tail(&dai->list, &component->dai_list);
        component->num_dai++;

        dev_dbg(dev, "ASoC: Registered DAI '%s'\n", dai->name);
        return dai;
}

/**
 * snd_soc_register_dais - Register a DAI with the ASoC core
 *
 * @component: The component the DAIs are registered for
 * @dai_drv: DAI driver to use for the DAIs
 * @count: Number of DAIs
 */
static int snd_soc_register_dais(struct snd_soc_component *component,
                                 struct snd_soc_dai_driver *dai_drv,
                                 size_t count)
{
        struct device *dev = component->dev;
        struct snd_soc_dai *dai;
        unsigned int i;
        int ret;

        dev_dbg(dev, "ASoC: dai register %s #%zu\n", dev_name(dev), count);

        for (i = 0; i < count; i++) {

                dai = soc_add_dai(component, dai_drv + i, count == 1 &&
                                  !component->driver->non_legacy_dai_naming);
                if (dai == NULL) {
                        ret = -ENOMEM;
                        goto err;
                }
        }

        return 0;

err:
        snd_soc_unregister_dais(component);

        return ret;
}

/**
 * snd_soc_register_dai - Register a DAI dynamically & create its widgets
 *
 * @component: The component the DAIs are registered for
 * @dai_drv: DAI driver to use for the DAI
 *
 * Topology can use this API to register DAIs when probing a component.
 * These DAIs's widgets will be freed in the card cleanup and the DAIs
 * will be freed in the component cleanup.
 */
int snd_soc_register_dai(struct snd_soc_component *component,
        struct snd_soc_dai_driver *dai_drv)
{
        struct snd_soc_dapm_context *dapm =
                snd_soc_component_get_dapm(component);
        struct snd_soc_dai *dai;
        int ret;

        if (dai_drv->dobj.type != SND_SOC_DOBJ_PCM) {
                dev_err(component->dev, "Invalid dai type %d\n",
                        dai_drv->dobj.type);
                return -EINVAL;
        }

        lockdep_assert_held(&client_mutex);
        dai = soc_add_dai(component, dai_drv, false);
        if (!dai)
                return -ENOMEM;

        /*
         * Create the DAI widgets here. After adding DAIs, topology may
         * also add routes that need these widgets as source or sink.
         */
        ret = snd_soc_dapm_new_dai_widgets(dapm, dai);
        if (ret != 0) {
                dev_err(component->dev,
                        "Failed to create DAI widgets %d\n", ret);
        }

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_dai);

static 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);
        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;
}

static void snd_soc_component_setup_regmap(struct snd_soc_component *component)
{
        int val_bytes = regmap_get_val_bytes(component->regmap);

        /* Errors are legitimate for non-integer byte multiples */
        if (val_bytes > 0)
                component->val_bytes = val_bytes;
}

#ifdef CONFIG_REGMAP

/**
 * snd_soc_component_init_regmap() - Initialize regmap instance for the
 *                                   component
 * @component: The component for which to initialize the regmap instance
 * @regmap: The regmap instance that should be used by the component
 *
 * This function allows deferred assignment of the regmap instance that is
 * associated with the component. Only use this if the regmap instance is not
 * yet ready when the component is registered. The function must also be called
 * before the first IO attempt of the component.
 */
void snd_soc_component_init_regmap(struct snd_soc_component *component,
        struct regmap *regmap)
{
        component->regmap = regmap;
        snd_soc_component_setup_regmap(component);
}
EXPORT_SYMBOL_GPL(snd_soc_component_init_regmap);

/**
 * snd_soc_component_exit_regmap() - De-initialize regmap instance for the
 *                                   component
 * @component: The component for which to de-initialize the regmap instance
 *
 * Calls regmap_exit() on the regmap instance associated to the component and
 * removes the regmap instance from the component.
 *
 * This function should only be used if snd_soc_component_init_regmap() was used
 * to initialize the regmap instance.
 */
void snd_soc_component_exit_regmap(struct snd_soc_component *component)
{
        regmap_exit(component->regmap);
        component->regmap = NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_component_exit_regmap);

#endif

static void snd_soc_component_add(struct snd_soc_component *component)
{
        mutex_lock(&client_mutex);

        if (!component->driver->write && !component->driver->read) {
                if (!component->regmap)
                        component->regmap = dev_get_regmap(component->dev,
                                                           NULL);
                if (component->regmap)
                        snd_soc_component_setup_regmap(component);
        }

        /* see for_each_component */
        list_add(&component->list, &component_list);

        mutex_unlock(&client_mutex);
}

static void snd_soc_component_cleanup(struct snd_soc_component *component)
{
        snd_soc_unregister_dais(component);
        kfree(component->name);
}

static void snd_soc_component_del_unlocked(struct snd_soc_component *component)
{
        struct snd_soc_card *card = component->card;

        if (card)
                snd_soc_unbind_card(card, false);

        list_del(&component->list);
}

#define ENDIANNESS_MAP(name) \
        (SNDRV_PCM_FMTBIT_##name##LE | SNDRV_PCM_FMTBIT_##name##BE)
static u64 endianness_format_map[] = {
        ENDIANNESS_MAP(S16_),
        ENDIANNESS_MAP(U16_),
        ENDIANNESS_MAP(S24_),
        ENDIANNESS_MAP(U24_),
        ENDIANNESS_MAP(S32_),
        ENDIANNESS_MAP(U32_),
        ENDIANNESS_MAP(S24_3),
        ENDIANNESS_MAP(U24_3),
        ENDIANNESS_MAP(S20_3),
        ENDIANNESS_MAP(U20_3),
        ENDIANNESS_MAP(S18_3),
        ENDIANNESS_MAP(U18_3),
        ENDIANNESS_MAP(FLOAT_),
        ENDIANNESS_MAP(FLOAT64_),
        ENDIANNESS_MAP(IEC958_SUBFRAME_),
};

/*
 * Fix up the DAI formats for endianness: codecs don't actually see
 * the endianness of the data but we're using the CPU format
 * definitions which do need to include endianness so we ensure that
 * codec DAIs always have both big and little endian variants set.
 */
static void convert_endianness_formats(struct snd_soc_pcm_stream *stream)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(endianness_format_map); i++)
                if (stream->formats & endianness_format_map[i])
                        stream->formats |= endianness_format_map[i];
}

static void snd_soc_try_rebind_card(void)
{
        struct snd_soc_card *card, *c;

        list_for_each_entry_safe(card, c, &unbind_card_list, list)
                if (!snd_soc_bind_card(card))
                        list_del(&card->list);
}

int snd_soc_add_component(struct device *dev,
                        struct snd_soc_component *component,
                        const struct snd_soc_component_driver *component_driver,
                        struct snd_soc_dai_driver *dai_drv,
                        int num_dai)
{
        int ret;
        int i;

        ret = snd_soc_component_initialize(component, component_driver, dev);
        if (ret)
                goto err_free;

        if (component_driver->endianness) {
                for (i = 0; i < num_dai; i++) {
                        convert_endianness_formats(&dai_drv[i].playback);
                        convert_endianness_formats(&dai_drv[i].capture);
                }
        }

        ret = snd_soc_register_dais(component, dai_drv, num_dai);
        if (ret < 0) {
                dev_err(dev, "ASoC: Failed to register DAIs: %d\n", ret);
                goto err_cleanup;
        }

        snd_soc_component_add(component);
        snd_soc_try_rebind_card();

        return 0;

err_cleanup:
        snd_soc_component_cleanup(component);
err_free:
        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_add_component);

int snd_soc_register_component(struct device *dev,
                        const struct snd_soc_component_driver *component_driver,
                        struct snd_soc_dai_driver *dai_drv,
                        int num_dai)
{
        struct snd_soc_component *component;

        component = devm_kzalloc(dev, sizeof(*component), GFP_KERNEL);
        if (!component)
                return -ENOMEM;

        return snd_soc_add_component(dev, component, component_driver,
                                     dai_drv, num_dai);
}
EXPORT_SYMBOL_GPL(snd_soc_register_component);

/**
 * snd_soc_unregister_component - Unregister all related component
 * from the ASoC core
 *
 * @dev: The device to unregister
 */
static int __snd_soc_unregister_component(struct device *dev)
{
        struct snd_soc_component *component;
        int found = 0;

        mutex_lock(&client_mutex);
        for_each_component(component) {
                if (dev != component->dev)
                        continue;

                snd_soc_tplg_component_remove(component,
                                              SND_SOC_TPLG_INDEX_ALL);
                snd_soc_component_del_unlocked(component);
                found = 1;
                break;
        }
        mutex_unlock(&client_mutex);

        if (found)
                snd_soc_component_cleanup(component);

        return found;
}

void snd_soc_unregister_component(struct device *dev)
{
        while (__snd_soc_unregister_component(dev))
                ;
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_component);

struct snd_soc_component *snd_soc_lookup_component(struct device *dev,
                                                   const char *driver_name)
{
        struct snd_soc_component *component;
        struct snd_soc_component *ret;

        ret = NULL;
        mutex_lock(&client_mutex);
        for_each_component(component) {
                if (dev != component->dev)
                        continue;

                if (driver_name &&
                    (driver_name != component->driver->name) &&
                    (strcmp(component->driver->name, driver_name) != 0))
                        continue;

                ret = component;
                break;
        }
        mutex_unlock(&client_mutex);

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_lookup_component);

/* Retrieve a card's name from device tree */
int snd_soc_of_parse_card_name(struct snd_soc_card *card,
                               const char *propname)
{
        struct device_node *np;
        int ret;

        if (!card->dev) {
                pr_err("card->dev is not set before calling %s\n", __func__);
                return -EINVAL;
        }

        np = card->dev->of_node;

        ret = of_property_read_string_index(np, propname, 0, &card->name);
        /*
         * EINVAL means the property does not exist. This is fine providing
         * card->name was previously set, which is checked later in
         * snd_soc_register_card.
         */
        if (ret < 0 && ret != -EINVAL) {
                dev_err(card->dev,
                        "ASoC: Property '%s' could not be read: %d\n",
                        propname, ret);
                return ret;
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_card_name);

static const struct snd_soc_dapm_widget simple_widgets[] = {
        SND_SOC_DAPM_MIC("Microphone", NULL),
        SND_SOC_DAPM_LINE("Line", NULL),
        SND_SOC_DAPM_HP("Headphone", NULL),
        SND_SOC_DAPM_SPK("Speaker", NULL),
};

int snd_soc_of_parse_audio_simple_widgets(struct snd_soc_card *card,
                                          const char *propname)
{
        struct device_node *np = card->dev->of_node;
        struct snd_soc_dapm_widget *widgets;
        const char *template, *wname;
        int i, j, num_widgets, ret;

        num_widgets = of_property_count_strings(np, propname);
        if (num_widgets < 0) {
                dev_err(card->dev,
                        "ASoC: Property '%s' does not exist\n", propname);
                return -EINVAL;
        }
        if (num_widgets & 1) {
                dev_err(card->dev,
                        "ASoC: Property '%s' length is not even\n", propname);
                return -EINVAL;
        }

        num_widgets /= 2;
        if (!num_widgets) {
                dev_err(card->dev, "ASoC: Property '%s's length is zero\n",
                        propname);
                return -EINVAL;
        }

        widgets = devm_kcalloc(card->dev, num_widgets, sizeof(*widgets),
                               GFP_KERNEL);
        if (!widgets) {
                dev_err(card->dev,
                        "ASoC: Could not allocate memory for widgets\n");
                return -ENOMEM;
        }

        for (i = 0; i < num_widgets; i++) {
                ret = of_property_read_string_index(np, propname,
                        2 * i, &template);
                if (ret) {
                        dev_err(card->dev,
                                "ASoC: Property '%s' index %d read error:%d\n",
                                propname, 2 * i, ret);
                        return -EINVAL;
                }

                for (j = 0; j < ARRAY_SIZE(simple_widgets); j++) {
                        if (!strncmp(template, simple_widgets[j].name,
                                     strlen(simple_widgets[j].name))) {
                                widgets[i] = simple_widgets[j];
                                break;
                        }
                }

                if (j >= ARRAY_SIZE(simple_widgets)) {
                        dev_err(card->dev,
                                "ASoC: DAPM widget '%s' is not supported\n",
                                template);
                        return -EINVAL;
                }

                ret = of_property_read_string_index(np, propname,
                                                    (2 * i) + 1,
                                                    &wname);
                if (ret) {
                        dev_err(card->dev,
                                "ASoC: Property '%s' index %d read error:%d\n",
                                propname, (2 * i) + 1, ret);
                        return -EINVAL;
                }

                widgets[i].name = wname;
        }

        card->of_dapm_widgets = widgets;
        card->num_of_dapm_widgets = num_widgets;

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_simple_widgets);

int snd_soc_of_get_slot_mask(struct device_node *np,
                             const char *prop_name,
                             unsigned int *mask)
{
        u32 val;
        const __be32 *of_slot_mask = of_get_property(np, prop_name, &val);
        int i;

        if (!of_slot_mask)
                return 0;
        val /= sizeof(u32);
        for (i = 0; i < val; i++)
                if (be32_to_cpup(&of_slot_mask[i]))
                        *mask |= (1 << i);

        return val;
}
EXPORT_SYMBOL_GPL(snd_soc_of_get_slot_mask);

int snd_soc_of_parse_tdm_slot(struct device_node *np,
                              unsigned int *tx_mask,
                              unsigned int *rx_mask,
                              unsigned int *slots,
                              unsigned int *slot_width)
{
        u32 val;
        int ret;

        if (tx_mask)
                snd_soc_of_get_slot_mask(np, "dai-tdm-slot-tx-mask", tx_mask);
        if (rx_mask)
                snd_soc_of_get_slot_mask(np, "dai-tdm-slot-rx-mask", rx_mask);

        if (of_property_read_bool(np, "dai-tdm-slot-num")) {
                ret = of_property_read_u32(np, "dai-tdm-slot-num", &val);
                if (ret)
                        return ret;

                if (slots)
                        *slots = val;
        }

        if (of_property_read_bool(np, "dai-tdm-slot-width")) {
                ret = of_property_read_u32(np, "dai-tdm-slot-width", &val);
                if (ret)
                        return ret;

                if (slot_width)
                        *slot_width = val;
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_tdm_slot);

void snd_soc_of_parse_node_prefix(struct device_node *np,
                                  struct snd_soc_codec_conf *codec_conf,
                                  struct device_node *of_node,
                                  const char *propname)
{
        const char *str;
        int ret;

        ret = of_property_read_string(np, propname, &str);
        if (ret < 0) {
                /* no prefix is not error */
                return;
        }

        codec_conf->of_node     = of_node;
        codec_conf->name_prefix = str;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_node_prefix);

int snd_soc_of_parse_audio_routing(struct snd_soc_card *card,
                                   const char *propname)
{
        struct device_node *np = card->dev->of_node;
        int num_routes;
        struct snd_soc_dapm_route *routes;
        int i, ret;

        num_routes = of_property_count_strings(np, propname);
        if (num_routes < 0 || num_routes & 1) {
                dev_err(card->dev,
                        "ASoC: Property '%s' does not exist or its length is not even\n",
                        propname);
                return -EINVAL;
        }
        num_routes /= 2;
        if (!num_routes) {
                dev_err(card->dev, "ASoC: Property '%s's length is zero\n",
                        propname);
                return -EINVAL;
        }

        routes = devm_kcalloc(card->dev, num_routes, sizeof(*routes),
                              GFP_KERNEL);
        if (!routes) {
                dev_err(card->dev,
                        "ASoC: Could not allocate DAPM route table\n");
                return -EINVAL;
        }

        for (i = 0; i < num_routes; i++) {
                ret = of_property_read_string_index(np, propname,
                        2 * i, &routes[i].sink);
                if (ret) {
                        dev_err(card->dev,
                                "ASoC: Property '%s' index %d could not be read: %d\n",
                                propname, 2 * i, ret);
                        return -EINVAL;
                }
                ret = of_property_read_string_index(np, propname,
                        (2 * i) + 1, &routes[i].source);
                if (ret) {
                        dev_err(card->dev,
                                "ASoC: Property '%s' index %d could not be read: %d\n",
                                propname, (2 * i) + 1, ret);
                        return -EINVAL;
                }
        }

        card->num_of_dapm_routes = num_routes;
        card->of_dapm_routes = routes;

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_routing);

unsigned int snd_soc_of_parse_daifmt(struct device_node *np,
                                     const char *prefix,
                                     struct device_node **bitclkmaster,
                                     struct device_node **framemaster)
{
        int ret, i;
        char prop[128];
        unsigned int format = 0;
        int bit, frame;
        const char *str;
        struct {
                char *name;
                unsigned int val;
        } of_fmt_table[] = {
                { "i2s",        SND_SOC_DAIFMT_I2S },
                { "right_j",    SND_SOC_DAIFMT_RIGHT_J },
                { "left_j",     SND_SOC_DAIFMT_LEFT_J },
                { "dsp_a",      SND_SOC_DAIFMT_DSP_A },
                { "dsp_b",      SND_SOC_DAIFMT_DSP_B },
                { "ac97",       SND_SOC_DAIFMT_AC97 },
                { "pdm",        SND_SOC_DAIFMT_PDM},
                { "msb",        SND_SOC_DAIFMT_MSB },
                { "lsb",        SND_SOC_DAIFMT_LSB },
        };

        if (!prefix)
                prefix = "";

        /*
         * check "dai-format = xxx"
         * or    "[prefix]format = xxx"
         * SND_SOC_DAIFMT_FORMAT_MASK area
         */
        ret = of_property_read_string(np, "dai-format", &str);
        if (ret < 0) {
                snprintf(prop, sizeof(prop), "%sformat", prefix);
                ret = of_property_read_string(np, prop, &str);
        }
        if (ret == 0) {
                for (i = 0; i < ARRAY_SIZE(of_fmt_table); i++) {
                        if (strcmp(str, of_fmt_table[i].name) == 0) {
                                format |= of_fmt_table[i].val;
                                break;
                        }
                }
        }

        /*
         * check "[prefix]continuous-clock"
         * SND_SOC_DAIFMT_CLOCK_MASK area
         */
        snprintf(prop, sizeof(prop), "%scontinuous-clock", prefix);
        if (of_property_read_bool(np, prop))
                format |= SND_SOC_DAIFMT_CONT;
        else
                format |= SND_SOC_DAIFMT_GATED;

        /*
         * check "[prefix]bitclock-inversion"
         * check "[prefix]frame-inversion"
         * SND_SOC_DAIFMT_INV_MASK area
         */
        snprintf(prop, sizeof(prop), "%sbitclock-inversion", prefix);
        bit = !!of_get_property(np, prop, NULL);

        snprintf(prop, sizeof(prop), "%sframe-inversion", prefix);
        frame = !!of_get_property(np, prop, NULL);

        switch ((bit << 4) + frame) {
        case 0x11:
                format |= SND_SOC_DAIFMT_IB_IF;
                break;
        case 0x10:
                format |= SND_SOC_DAIFMT_IB_NF;
                break;
        case 0x01:
                format |= SND_SOC_DAIFMT_NB_IF;
                break;
        default:
                /* SND_SOC_DAIFMT_NB_NF is default */
                break;
        }

        /*
         * check "[prefix]bitclock-master"
         * check "[prefix]frame-master"
         * SND_SOC_DAIFMT_MASTER_MASK area
         */
        snprintf(prop, sizeof(prop), "%sbitclock-master", prefix);
        bit = !!of_get_property(np, prop, NULL);
        if (bit && bitclkmaster)
                *bitclkmaster = of_parse_phandle(np, prop, 0);

        snprintf(prop, sizeof(prop), "%sframe-master", prefix);
        frame = !!of_get_property(np, prop, NULL);
        if (frame && framemaster)
                *framemaster = of_parse_phandle(np, prop, 0);

        switch ((bit << 4) + frame) {
        case 0x11:
                format |= SND_SOC_DAIFMT_CBM_CFM;
                break;
        case 0x10:
                format |= SND_SOC_DAIFMT_CBM_CFS;
                break;
        case 0x01:
                format |= SND_SOC_DAIFMT_CBS_CFM;
                break;
        default:
                format |= SND_SOC_DAIFMT_CBS_CFS;
                break;
        }

        return format;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_daifmt);

int snd_soc_get_dai_id(struct device_node *ep)
{
        struct snd_soc_component *component;
        struct snd_soc_dai_link_component dlc;
        int ret;

        dlc.of_node     = of_graph_get_port_parent(ep);
        dlc.name        = NULL;
        /*
         * For example HDMI case, HDMI has video/sound port,
         * but ALSA SoC needs sound port number only.
         * Thus counting HDMI DT port/endpoint doesn't work.
         * Then, it should have .of_xlate_dai_id
         */
        ret = -ENOTSUPP;
        mutex_lock(&client_mutex);
        component = soc_find_component(&dlc);
        if (component)
                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)
                        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;
                }

                break;
        }
        mutex_unlock(&client_mutex);
        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_get_dai_name);

int snd_soc_of_get_dai_name(struct device_node *of_node,
                            const char **dai_name)
{
        struct of_phandle_args args;
        int ret;

        ret = of_parse_phandle_with_args(of_node, "sound-dai",
                                         "#sound-dai-cells", 0, &args);
        if (ret)
                return ret;

        ret = snd_soc_get_dai_name(&args, dai_name);

        of_node_put(args.np);

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_name);

/*
 * snd_soc_of_put_dai_link_codecs - Dereference device nodes in the codecs array
 * @dai_link: DAI link
 *
 * Dereference device nodes acquired by snd_soc_of_get_dai_link_codecs().
 */
void snd_soc_of_put_dai_link_codecs(struct snd_soc_dai_link *dai_link)
{
        struct snd_soc_dai_link_component *component;
        int index;

        for_each_link_codecs(dai_link, index, component) {
                if (!component->of_node)
                        break;
                of_node_put(component->of_node);
                component->of_node = NULL;
        }
}
EXPORT_SYMBOL_GPL(snd_soc_of_put_dai_link_codecs);

/*
 * snd_soc_of_get_dai_link_codecs - Parse a list of CODECs in the devicetree
 * @dev: Card device
 * @of_node: Device node
 * @dai_link: DAI link
 *
 * Builds an array of CODEC DAI components from the DAI link property
 * 'sound-dai'.
 * The array is set in the DAI link and the number of DAIs is set accordingly.
 * The device nodes in the array (of_node) must be dereferenced by calling
 * snd_soc_of_put_dai_link_codecs() on @dai_link.
 *
 * Returns 0 for success
 */
int snd_soc_of_get_dai_link_codecs(struct device *dev,
                                   struct device_node *of_node,
                                   struct snd_soc_dai_link *dai_link)
{
        struct of_phandle_args args;
        struct snd_soc_dai_link_component *component;
        char *name;
        int index, num_codecs, ret;

        /* Count the number of CODECs */
        name = "sound-dai";
        num_codecs = of_count_phandle_with_args(of_node, name,
                                                "#sound-dai-cells");
        if (num_codecs <= 0) {
                if (num_codecs == -ENOENT)
                        dev_err(dev, "No 'sound-dai' property\n");
                else
                        dev_err(dev, "Bad phandle in 'sound-dai'\n");
                return num_codecs;
        }
        component = devm_kcalloc(dev,
                                 num_codecs, sizeof(*component),
                                 GFP_KERNEL);
        if (!component)
                return -ENOMEM;
        dai_link->codecs = component;
        dai_link->num_codecs = num_codecs;

        /* Parse the list */
        for_each_link_codecs(dai_link, index, component) {
                ret = of_parse_phandle_with_args(of_node, name,
                                                 "#sound-dai-cells",
                                                 index, &args);
                if (ret)
                        goto err;
                component->of_node = args.np;
                ret = snd_soc_get_dai_name(&args, &component->dai_name);
                if (ret < 0)
                        goto err;
        }
        return 0;
err:
        snd_soc_of_put_dai_link_codecs(dai_link);
        dai_link->codecs = NULL;
        dai_link->num_codecs = 0;
        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_link_codecs);

static int __init snd_soc_init(void)
{
        snd_soc_debugfs_init();
        snd_soc_util_init();

        return platform_driver_register(&soc_driver);
}
module_init(snd_soc_init);

static void __exit snd_soc_exit(void)
{
        snd_soc_util_exit();
        snd_soc_debugfs_exit();

        platform_driver_unregister(&soc_driver);
}
module_exit(snd_soc_exit);

/* Module information */
MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
MODULE_DESCRIPTION("ALSA SoC Core");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:soc-audio");