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

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

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

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

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

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

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

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

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

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

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

        return count;
}

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

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

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

        if (!rtd)
                return 0;

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

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

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

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

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

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

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

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

        snd_soc_dapm_debugfs_init(snd_soc_component_get_dapm(component),
                component->debugfs_root);
}

static void soc_cleanup_component_debugfs(struct snd_soc_component *component)
{
        if (!component->debugfs_root)
                return;
        debugfs_remove_recursive(component->debugfs_root);
        component->debugfs_root = NULL;
}

static int dai_list_show(struct seq_file *m, void *v)
{
        struct snd_soc_component *component;
        struct snd_soc_dai *dai;

        mutex_lock(&client_mutex);

        for_each_component(component)
                for_each_component_dais(component, dai)
                        seq_printf(m, "%s\n", dai->name);

        mutex_unlock(&client_mutex);

        return 0;
}
DEFINE_SHOW_ATTRIBUTE(dai_list);

static int component_list_show(struct seq_file *m, void *v)
{
        struct snd_soc_component *component;

        mutex_lock(&client_mutex);

        for_each_component(component)
                seq_printf(m, "%s\n", component->name);

        mutex_unlock(&client_mutex);

        return 0;
}
DEFINE_SHOW_ATTRIBUTE(component_list);

static void soc_init_card_debugfs(struct snd_soc_card *card)
{
        card->debugfs_card_root = debugfs_create_dir(card->name,
                                                     snd_soc_debugfs_root);

        debugfs_create_u32("dapm_pop_time", 0644, card->debugfs_card_root,
                           &card->pop_time);

        snd_soc_dapm_debugfs_init(&card->dapm, card->debugfs_card_root);
}

static void soc_cleanup_card_debugfs(struct snd_soc_card *card)
{
        debugfs_remove_recursive(card->debugfs_card_root);
        card->debugfs_card_root = NULL;
}

static void snd_soc_debugfs_init(void)
{
        snd_soc_debugfs_root = debugfs_create_dir("asoc", NULL);

        debugfs_create_file("dais", 0444, snd_soc_debugfs_root, NULL,
                            &dai_list_fops);

        debugfs_create_file("components", 0444, snd_soc_debugfs_root, NULL,
                            &component_list_fops);
}

static void snd_soc_debugfs_exit(void)
{
        debugfs_remove_recursive(snd_soc_debugfs_root);
}

#else

static inline void soc_init_component_debugfs(
        struct snd_soc_component *component)
{
}

static inline void soc_cleanup_component_debugfs(
        struct snd_soc_component *component)
{
}

static inline void soc_init_card_debugfs(struct snd_soc_card *card)
{
}

static inline void soc_cleanup_card_debugfs(struct snd_soc_card *card)
{
}

static inline void snd_soc_debugfs_init(void)
{
}

static inline void snd_soc_debugfs_exit(void)
{
}

#endif

static int snd_soc_rtd_add_component(struct snd_soc_pcm_runtime *rtd,
                                     struct snd_soc_component *component)
{
        struct snd_soc_component *comp;
        int i;

        for_each_rtd_components(rtd, i, comp) {
                /* already connected */
                if (comp == component)
                        return 0;
        }

        /* see for_each_rtd_components */
        rtd->components[rtd->num_components] = component;
        rtd->num_components++;

        return 0;
}

struct snd_soc_component *snd_soc_rtdcom_lookup(struct snd_soc_pcm_runtime *rtd,
                                                const char *driver_name)
{
        struct snd_soc_component *component;
        int i;

        if (!driver_name)
                return NULL;

        /*
         * NOTE
         *
         * snd_soc_rtdcom_lookup() will find component from rtd by using
         * specified driver name.
         * But, if many components which have same driver name are connected
         * to 1 rtd, this function will return 1st found component.
         */
        for_each_rtd_components(rtd, i, component) {
                const char *component_name = component->driver->name;

                if (!component_name)
                        continue;

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

        return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_rtdcom_lookup);

struct snd_soc_component
*snd_soc_lookup_component_nolocked(struct device *dev, const char *driver_name)
{
        struct snd_soc_component *component;
        struct snd_soc_component *found_component;

        found_component = NULL;
        for_each_component(component) {
                if ((dev == component->dev) &&
                    (!driver_name ||
                     (driver_name == component->driver->name) ||
                     (strcmp(component->driver->name, driver_name) == 0))) {
                        found_component = component;
                        break;
                }
        }

        return found_component;
}
EXPORT_SYMBOL_GPL(snd_soc_lookup_component_nolocked);

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

        mutex_lock(&client_mutex);
        component = snd_soc_lookup_component_nolocked(dev, driver_name);
        mutex_unlock(&client_mutex);

        return component;
}
EXPORT_SYMBOL_GPL(snd_soc_lookup_component);

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

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

/*
 * Power down the audio subsystem pmdown_time msecs after close is called.
 * This is to ensure there are no pops or clicks in between any music tracks
 * due to DAPM power cycling.
 */
void snd_soc_close_delayed_work(struct snd_soc_pcm_runtime *rtd)
{
        struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
        int playback = SNDRV_PCM_STREAM_PLAYBACK;

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

        dev_dbg(rtd->dev,
                "ASoC: pop wq checking: %s status: %s waiting: %s\n",
                codec_dai->driver->playback.stream_name,
                snd_soc_dai_stream_active(codec_dai, playback) ?
                "active" : "inactive",
                rtd->pop_wait ? "yes" : "no");

        /* are we waiting on this codec DAI stream */
        if (rtd->pop_wait == 1) {
                rtd->pop_wait = 0;
                snd_soc_dapm_stream_event(rtd, playback,
                                          SND_SOC_DAPM_STREAM_STOP);
        }

        mutex_unlock(&rtd->card->pcm_mutex);
}
EXPORT_SYMBOL_GPL(snd_soc_close_delayed_work);

static void soc_release_rtd_dev(struct device *dev)
{
        /* "dev" means "rtd->dev" */
        kfree(dev);
}

static void soc_free_pcm_runtime(struct snd_soc_pcm_runtime *rtd)
{
        if (!rtd)
                return;

        list_del(&rtd->list);

        if (delayed_work_pending(&rtd->delayed_work))
                flush_delayed_work(&rtd->delayed_work);
        snd_soc_pcm_component_free(rtd);

        /*
         * we don't need to call kfree() for rtd->dev
         * see
         *      soc_release_rtd_dev()
         *
         * We don't need rtd->dev NULL check, because
         * it is alloced *before* rtd.
         * see
         *      soc_new_pcm_runtime()
         *
         * We don't need to mind freeing for rtd,
         * because it was created from dev (= rtd->dev)
         * see
         *      soc_new_pcm_runtime()
         *
         *              rtd = devm_kzalloc(dev, ...);
         *              rtd->dev = dev
         */
        device_unregister(rtd->dev);
}

static void close_delayed_work(struct work_struct *work) {
        struct snd_soc_pcm_runtime *rtd =
                        container_of(work, struct snd_soc_pcm_runtime,
                                     delayed_work.work);

        if (rtd->close_delayed_work_func)
                rtd->close_delayed_work_func(rtd);
}

static struct snd_soc_pcm_runtime *soc_new_pcm_runtime(
        struct snd_soc_card *card, struct snd_soc_dai_link *dai_link)
{
        struct snd_soc_pcm_runtime *rtd;
        struct snd_soc_component *component;
        struct device *dev;
        int ret;
        int stream;

        /*
         * for rtd->dev
         */
        dev = kzalloc(sizeof(struct device), GFP_KERNEL);
        if (!dev)
                return NULL;

        dev->parent     = card->dev;
        dev->release    = soc_release_rtd_dev;

        dev_set_name(dev, "%s", dai_link->name);

        ret = device_register(dev);
        if (ret < 0) {
                put_device(dev); /* soc_release_rtd_dev */
                return NULL;
        }

        /*
         * for rtd
         */
        rtd = devm_kzalloc(dev,
                           sizeof(*rtd) +
                           sizeof(*component) * (dai_link->num_cpus +
                                                 dai_link->num_codecs +
                                                 dai_link->num_platforms),
                           GFP_KERNEL);
        if (!rtd) {
                device_unregister(dev);
                return NULL;
        }

        rtd->dev = dev;
        INIT_LIST_HEAD(&rtd->list);
        for_each_pcm_streams(stream) {
                INIT_LIST_HEAD(&rtd->dpcm[stream].be_clients);
                INIT_LIST_HEAD(&rtd->dpcm[stream].fe_clients);
        }
        dev_set_drvdata(dev, rtd);
        INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);

        /*
         * for rtd->dais
         */
        rtd->dais = devm_kcalloc(dev, dai_link->num_cpus + dai_link->num_codecs,
                                        sizeof(struct snd_soc_dai *),
                                        GFP_KERNEL);
        if (!rtd->dais)
                goto free_rtd;

        /*
         * dais = [][][][][][][][][][][][][][][][][][]
         *        ^cpu_dais         ^codec_dais
         *        |--- num_cpus ---|--- num_codecs --|
         * see
         *      asoc_rtd_to_cpu()
         *      asoc_rtd_to_codec()
         */
        rtd->num_cpus   = dai_link->num_cpus;
        rtd->num_codecs = dai_link->num_codecs;
        rtd->card       = card;
        rtd->dai_link   = dai_link;
        rtd->num        = card->num_rtd++;

        /* see for_each_card_rtds */
        list_add_tail(&rtd->list, &card->rtd_list);

        ret = device_add_groups(dev, soc_dev_attr_groups);
        if (ret < 0)
                goto free_rtd;

        return rtd;

free_rtd:
        soc_free_pcm_runtime(rtd);
        return NULL;
}

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

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

#ifdef CONFIG_PM_SLEEP
static void soc_playback_digital_mute(struct snd_soc_card *card, int mute)
{
        struct snd_soc_pcm_runtime *rtd;
        struct snd_soc_dai *dai;
        int playback = SNDRV_PCM_STREAM_PLAYBACK;
        int i;

        for_each_card_rtds(card, rtd) {

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

                for_each_rtd_dais(rtd, i, dai) {
                        if (snd_soc_dai_stream_active(dai, playback))
                                snd_soc_dai_digital_mute(dai, mute, playback);
                }
        }
}

static void soc_dapm_suspend_resume(struct snd_soc_card *card, int event)
{
        struct snd_soc_pcm_runtime *rtd;
        int stream;

        for_each_card_rtds(card, rtd) {

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

                for_each_pcm_streams(stream)
                        snd_soc_dapm_stream_event(rtd, stream, event);
        }
}

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

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

        /*
         * Due to the resume being scheduled into a workqueue we could
         * suspend before that's finished - wait for it to complete.
         */
        snd_power_wait(card->snd_card, 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 */
        soc_playback_digital_mute(card, 1);

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

                snd_pcm_suspend_all(rtd->pcm);
        }

        snd_soc_card_suspend_pre(card);

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

        soc_dapm_suspend_resume(card, SND_SOC_DAPM_STREAM_SUSPEND);

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

        /* suspend all COMPONENTs */
        for_each_card_rtds(card, rtd) {

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

                for_each_rtd_components(rtd, i, component) {
                        struct snd_soc_dapm_context *dapm =
                                snd_soc_component_get_dapm(component);

                        /*
                         * ignore if component was already suspended
                         */
                        if (snd_soc_component_is_suspended(component))
                                continue;

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

                        case SND_SOC_BIAS_OFF:
                                snd_soc_component_suspend(component);
                                if (component->regmap)
                                        regcache_mark_dirty(component->regmap);
                                /* deactivate pins to sleep state */
                                pinctrl_pm_select_sleep_state(component->dev);
                                break;
                        default:
                                dev_dbg(component->dev,
                                        "ASoC: COMPONENT is on over suspend\n");
                                break;
                        }
                }
        }

        snd_soc_card_suspend_post(card);

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_suspend);

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

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

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

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

        snd_soc_card_resume_pre(card);

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

        soc_dapm_suspend_resume(card, SND_SOC_DAPM_STREAM_RESUME);

        /* unmute any active DACs */
        soc_playback_digital_mute(card, 0);

        snd_soc_card_resume_post(card);

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

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

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

/* powers up audio subsystem after a suspend */
int snd_soc_resume(struct device *dev)
{
        struct snd_soc_card *card = dev_get_drvdata(dev);
        struct snd_soc_component *component;

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

        /* activate pins from sleep state */
        for_each_card_components(card, component)
                if (snd_soc_component_active(component))
                        pinctrl_pm_select_default_state(component->dev);

        dev_dbg(dev, "ASoC: Scheduling resume work\n");
        if (!schedule_work(&card->deferred_resume_work))
                dev_err(dev, "ASoC: resume work item may be lost\n");

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_resume);

static void soc_resume_init(struct snd_soc_card *card)
{
        /* deferred resume work */
        INIT_WORK(&card->deferred_resume_work, soc_resume_deferred);
}
#else
#define snd_soc_suspend NULL
#define snd_soc_resume NULL
static inline void soc_resume_init(struct snd_soc_card *card)
{
}
#endif

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

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

        return of_node;
}

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

        if (!dlc)
                return 0;

        component_of_node = soc_component_to_node(component);

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

        return 1;
}

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

        lockdep_assert_held(&client_mutex);

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

        return NULL;
}

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

        lockdep_assert_held(&client_mutex);

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

                        return dai;
                }
        }

        return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_find_dai);

struct snd_soc_dai *snd_soc_find_dai_with_mutex(
        const struct snd_soc_dai_link_component *dlc)
{
        struct snd_soc_dai *dai;

        mutex_lock(&client_mutex);
        dai = snd_soc_find_dai(dlc);
        mutex_unlock(&client_mutex);

        return dai;
}
EXPORT_SYMBOL_GPL(snd_soc_find_dai_with_mutex);

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

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

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

                /*
                 * Defer card registration if codec component is not added to
                 * component list.
                 */
                if (!soc_find_component(codec)) {
                        dev_dbg(card->dev,
                                "ASoC: codec component %s not found for link %s\n",
                                codec->name, link->name);
                        return -EPROBE_DEFER;
                }
        }

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

                /*
                 * Defer card registration if platform component is not added to
                 * component list.
                 */
                if (!soc_find_component(platform)) {
                        dev_dbg(card->dev,
                                "ASoC: platform component %s not found for link %s\n",
                                platform->name, link->name);
                        return -EPROBE_DEFER;
                }
        }

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

                /*
                 * Defer card registration if cpu dai component is not added to
                 * component list.
                 */
                if ((cpu->of_node || cpu->name) &&
                    !soc_find_component(cpu)) {
                        dev_dbg(card->dev,
                                "ASoC: cpu component %s not found for link %s\n",
                                cpu->name, link->name);
                        return -EPROBE_DEFER;
                }

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

        return 0;
}

/**
 * snd_soc_remove_pcm_runtime - Remove a pcm_runtime from card
 * @card: The ASoC card to which the pcm_runtime has
 * @rtd: The pcm_runtime to remove
 *
 * This function removes a pcm_runtime from the ASoC card.
 */
void snd_soc_remove_pcm_runtime(struct snd_soc_card *card,
                                struct snd_soc_pcm_runtime *rtd)
{
        lockdep_assert_held(&client_mutex);

        /* release machine specific resources */
        snd_soc_link_exit(rtd);

        /*
         * Notify the machine driver for extra destruction
         */
        snd_soc_card_remove_dai_link(card, rtd->dai_link);

        soc_free_pcm_runtime(rtd);
}
EXPORT_SYMBOL_GPL(snd_soc_remove_pcm_runtime);

/**
 * snd_soc_add_pcm_runtime - Add a pcm_runtime dynamically via dai_link
 * @card: The ASoC card to which the pcm_runtime is added
 * @dai_link: The DAI link to find pcm_runtime
 *
 * This function adds a pcm_runtime ASoC card by using dai_link.
 *
 * Note: Topology can use this API to add pcm_runtime when probing the
 * topology component. And machine drivers can still define static
 * DAI links in dai_link array.
 */
int snd_soc_add_pcm_runtime(struct snd_soc_card *card,
                            struct snd_soc_dai_link *dai_link)
{
        struct snd_soc_pcm_runtime *rtd;
        struct snd_soc_dai_link_component *codec, *platform, *cpu;
        struct snd_soc_component *component;
        int i, ret;

        lockdep_assert_held(&client_mutex);

        /*
         * Notify the machine driver for extra initialization
         */
        ret = snd_soc_card_add_dai_link(card, dai_link);

        if (ret < 0)
                return ret;

        if (dai_link->ignore)
                return 0;

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

        ret = soc_dai_link_sanity_check(card, dai_link);
        if (ret < 0)
                return ret;

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

        for_each_link_cpus(dai_link, i, cpu) {
                asoc_rtd_to_cpu(rtd, i) = snd_soc_find_dai(cpu);
                if (!asoc_rtd_to_cpu(rtd, i)) {
                        dev_info(card->dev, "ASoC: CPU DAI %s not registered\n",
                                 cpu->dai_name);
                        goto _err_defer;
                }
                snd_soc_rtd_add_component(rtd, asoc_rtd_to_cpu(rtd, i)->component);
        }

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

                snd_soc_rtd_add_component(rtd, asoc_rtd_to_codec(rtd, i)->component);
        }

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

                        snd_soc_rtd_add_component(rtd, component);
                }
        }

        return 0;

_err_defer:
        snd_soc_remove_pcm_runtime(card, rtd);
        return -EPROBE_DEFER;
}
EXPORT_SYMBOL_GPL(snd_soc_add_pcm_runtime);

static int soc_init_pcm_runtime(struct snd_soc_card *card,
                                struct snd_soc_pcm_runtime *rtd)
{
        struct snd_soc_dai_link *dai_link = rtd->dai_link;
        struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
        struct snd_soc_component *component;
        int ret, num, i;

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

        /* do machine specific initialization */
        ret = snd_soc_link_init(rtd);
        if (ret < 0)
                return ret;

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

        /* add DPCM sysfs entries */
        soc_dpcm_debugfs_add(rtd);

        num = rtd->num;

        /*
         * most drivers will register their PCMs using DAI link ordering but
         * topology based drivers can use the DAI link id field to set PCM
         * device number and then use rtd + a base offset of the BEs.
         */
        for_each_rtd_components(rtd, i, component) {
                if (!component->driver->use_dai_pcm_id)
                        continue;

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

        /* create compress_device if possible */
        ret = snd_soc_dai_compress_new(cpu_dai, rtd, num);
        if (ret != -ENOTSUPP)
                return ret;

        /* create the pcm */
        ret = soc_new_pcm(rtd, num);
        if (ret < 0) {
                dev_err(card->dev, "ASoC: can't create pcm %s :%d\n",
                        dai_link->stream_name, ret);
                return ret;
        }

        return snd_soc_pcm_dai_new(rtd);
}

static void soc_set_name_prefix(struct snd_soc_card *card,
                                struct snd_soc_component *component)
{
        struct device_node *of_node = soc_component_to_node(component);
        const char *str;
        int ret, i;

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

                if (snd_soc_is_matching_component(&map->dlc, component) &&
                    map->name_prefix) {
                        component->name_prefix = map->name_prefix;
                        return;
                }
        }

        /*
         * If there is no configuration table or no match in the table,
         * check if a prefix is provided in the node
         */
        ret = of_property_read_string(of_node, "sound-name-prefix", &str);
        if (ret < 0)
                return;

        component->name_prefix = str;
}

static void soc_remove_component(struct snd_soc_component *component,
                                 int probed)
{

        if (!component->card)
                return;

        if (probed)
                snd_soc_component_remove(component);

        /* For framework level robustness */
        snd_soc_component_set_jack(component, NULL, NULL);

        list_del_init(&component->card_list);
        snd_soc_dapm_free(snd_soc_component_get_dapm(component));
        soc_cleanup_component_debugfs(component);
        component->card = NULL;
        snd_soc_component_module_put_when_remove(component);
}

static int soc_probe_component(struct snd_soc_card *card,
                               struct snd_soc_component *component)
{
        struct snd_soc_dapm_context *dapm =
                snd_soc_component_get_dapm(component);
        struct snd_soc_dai *dai;
        int probed = 0;
        int ret;

        if (snd_soc_component_is_dummy(component))
                return 0;

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

        ret = snd_soc_component_module_get_when_probe(component);
        if (ret < 0)
                return ret;

        component->card = card;
        soc_set_name_prefix(card, component);

        soc_init_component_debugfs(component);

        snd_soc_dapm_init(dapm, card, component);

        ret = snd_soc_dapm_new_controls(dapm,
                                        component->driver->dapm_widgets,
                                        component->driver->num_dapm_widgets);

        if (ret != 0) {
                dev_err(component->dev,
                        "Failed to create new controls %d\n", ret);
                goto err_probe;
        }

        for_each_component_dais(component, dai) {
                ret = snd_soc_dapm_new_dai_widgets(dapm, dai);
                if (ret != 0) {
                        dev_err(component->dev,
                                "Failed to create DAI widgets %d\n", ret);
                        goto err_probe;
                }
        }

        ret = snd_soc_component_probe(component);
        if (ret < 0)
                goto err_probe;

        WARN(dapm->idle_bias_off &&
             dapm->bias_level != SND_SOC_BIAS_OFF,
             "codec %s can not start from non-off bias with idle_bias_off==1\n",
             component->name);
        probed = 1;

        /*
         * machine specific init
         * see
         *      snd_soc_component_set_aux()
         */
        ret = snd_soc_component_init(component);
        if (ret < 0)
                goto err_probe;

        ret = snd_soc_add_component_controls(component,
                                             component->driver->controls,
                                             component->driver->num_controls);
        if (ret < 0)
                goto err_probe;

        ret = snd_soc_dapm_add_routes(dapm,
                                      component->driver->dapm_routes,
                                      component->driver->num_dapm_routes);
        if (ret < 0) {
                if (card->disable_route_checks) {
                        dev_info(card->dev,
                                 "%s: disable_route_checks set, ignoring errors on add_routes\n",
                                 __func__);
                } else {
                        dev_err(card->dev,
                                "%s: snd_soc_dapm_add_routes failed: %d\n",
                                __func__, ret);
                        goto err_probe;
                }
        }

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

err_probe:
        if (ret < 0)
                soc_remove_component(component, probed);

        return ret;
}

static void soc_remove_link_dais(struct snd_soc_card *card)
{
        struct snd_soc_pcm_runtime *rtd;
        int order;

        for_each_comp_order(order) {
                for_each_card_rtds(card, rtd) {
                        /* remove all rtd connected DAIs in good order */
                        snd_soc_pcm_dai_remove(rtd, order);
                }
        }
}

static int soc_probe_link_dais(struct snd_soc_card *card)
{
        struct snd_soc_pcm_runtime *rtd;
        int order, ret;

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

                        dev_dbg(card->dev,
                                "ASoC: probe %s dai link %d late %d\n",
                                card->name, rtd->num, order);

                        /* probe all rtd connected DAIs in good order */
                        ret = snd_soc_pcm_dai_probe(rtd, order);
                        if (ret)
                                return ret;
                }
        }

        return 0;
}

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

        for_each_comp_order(order) {
                for_each_card_rtds(card, rtd) {
                        for_each_rtd_components(rtd, i, component) {
                                if (component->driver->remove_order != order)
                                        continue;

                                soc_remove_component(component, 1);
                        }
                }
        }
}

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

        for_each_comp_order(order) {
                for_each_card_rtds(card, rtd) {
                        for_each_rtd_components(rtd, i, component) {
                                if (component->driver->probe_order != order)
                                        continue;

                                ret = soc_probe_component(card, component);
                                if (ret < 0)
                                        return ret;
                        }
                }
        }

        return 0;
}

static void soc_unbind_aux_dev(struct snd_soc_card *card)
{
        struct snd_soc_component *component, *_component;

        for_each_card_auxs_safe(card, component, _component) {
                /* for snd_soc_component_init() */
                snd_soc_component_set_aux(component, NULL);
                list_del(&component->card_aux_list);
        }
}

static int soc_bind_aux_dev(struct snd_soc_card *card)
{
        struct snd_soc_component *component;
        struct snd_soc_aux_dev *aux;
        int i;

        for_each_card_pre_auxs(card, i, aux) {
                /* codecs, usually analog devices */
                component = soc_find_component(&aux->dlc);
                if (!component)
                        return -EPROBE_DEFER;

                /* for snd_soc_component_init() */
                snd_soc_component_set_aux(component, aux);
                /* see for_each_card_auxs */
                list_add(&component->card_aux_list, &card->aux_comp_list);
        }
        return 0;
}

static int soc_probe_aux_devices(struct snd_soc_card *card)
{
        struct snd_soc_component *component;
        int order;
        int ret;

        for_each_comp_order(order) {
                for_each_card_auxs(card, component) {
                        if (component->driver->probe_order != order)
                                continue;

                        ret = soc_probe_component(card, component);
                        if (ret < 0)
                                return ret;
                }
        }

        return 0;
}

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

        for_each_comp_order(order) {
                for_each_card_auxs_safe(card, comp, _comp) {
                        if (comp->driver->remove_order == order)
                                soc_remove_component(comp, 1);
                }
        }
}

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

        for_each_rtd_codec_dais(rtd, i, codec_dai) {
                ret = snd_soc_dai_set_fmt(codec_dai, dai_fmt);
                if (ret != 0 && ret != -ENOTSUPP)
                        return ret;
        }

        /*
         * Flip the polarity for the "CPU" end of a CODEC<->CODEC link
         * the component which has non_legacy_dai_naming is Codec
         */
        inv_dai_fmt = dai_fmt & ~SND_SOC_DAIFMT_MASTER_MASK;
        switch (dai_fmt & SND_SOC_DAIFMT_MASTER_MASK) {
        case SND_SOC_DAIFMT_CBM_CFM:
                inv_dai_fmt |= SND_SOC_DAIFMT_CBS_CFS;
                break;
        case SND_SOC_DAIFMT_CBM_CFS:
                inv_dai_fmt |= SND_SOC_DAIFMT_CBS_CFM;
                break;
        case SND_SOC_DAIFMT_CBS_CFM:
                inv_dai_fmt |= SND_SOC_DAIFMT_CBM_CFS;
                break;
        case SND_SOC_DAIFMT_CBS_CFS:
                inv_dai_fmt |= SND_SOC_DAIFMT_CBM_CFM;
                break;
        }
        for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
                unsigned int fmt = dai_fmt;

                if (cpu_dai->component->driver->non_legacy_dai_naming)
                        fmt = inv_dai_fmt;

                ret = snd_soc_dai_set_fmt(cpu_dai, fmt);
                if (ret != 0 && ret != -ENOTSUPP)
                        return ret;
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_runtime_set_dai_fmt);

#ifdef CONFIG_DMI
/*
 * If a DMI filed contain strings in this blacklist (e.g.
 * "Type2 - Board Manufacturer" or "Type1 - TBD by OEM"), it will be taken
 * as invalid and dropped when setting the card long name from DMI info.
 */
static const char * const dmi_blacklist[] = {
        "To be filled by OEM",
        "TBD by OEM",
        "Default String",
        "Board Manufacturer",
        "Board Vendor Name",
        "Board Product Name",
        NULL,   /* terminator */
};

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

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

        name[j] = '\0';
}

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

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

        return 1;
}

/*
 * Append a string to card->dmi_longname with character cleanups.
 */
static void append_dmi_string(struct snd_soc_card *card, const char *str)
{
        char *dst = card->dmi_longname;
        size_t dst_len = sizeof(card->dmi_longname);
        size_t len;

        len = strlen(dst);
        snprintf(dst + len, dst_len - len, "-%s", str);

        len++;  /* skip the separator "-" */
        if (len < dst_len)
                cleanup_dmi_name(dst + len);
}

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

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

        if (!dmi_available)
                return 0;

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

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

        product = dmi_get_system_info(DMI_PRODUCT_NAME);
        if (product && is_dmi_valid(product)) {
                append_dmi_string(card, product);

                /*
                 * some vendors like Lenovo may only put a self-explanatory
                 * name in the product version field
                 */
                product_version = dmi_get_system_info(DMI_PRODUCT_VERSION);
                if (product_version && is_dmi_valid(product_version))
                        append_dmi_string(card, product_version);
        }

        board = dmi_get_system_info(DMI_BOARD_NAME);
        if (board && is_dmi_valid(board)) {
                if (!product || strcasecmp(board, product))
                        append_dmi_string(card, board);
        } else if (!product) {
                /* fall back to using legacy name */
                dev_warn(card->dev, "ASoC: no DMI board/product name!\n");
                return 0;
        }

        /* Add flavour to dmi long name */
        if (flavour)
                append_dmi_string(card, flavour);

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

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

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

        for_each_component(component) {

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

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

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

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

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

                        if (component->dev->of_node)
                                dai_link->platforms->of_node = component->dev->of_node;
                        else
                                dai_link->platforms->name = component->name;

                        /* convert non BE into BE */
                        if (!dai_link->no_pcm) {
                                dai_link->no_pcm = 1;

                                if (dai_link->dpcm_playback)
                                        dev_warn(card->dev,
                                                 "invalid configuration, dailink %s has flags no_pcm=0 and dpcm_playback=1\n",
                                                 dai_link->name);
                                if (dai_link->dpcm_capture)
                                        dev_warn(card->dev,
                                                 "invalid configuration, dailink %s has flags no_pcm=0 and dpcm_capture=1\n",
                                                 dai_link->name);

                                /* convert normal link into DPCM one */
                                if (!(dai_link->dpcm_playback ||
                                      dai_link->dpcm_capture)) {
                                        dai_link->dpcm_playback = !dai_link->capture_only;
                                        dai_link->dpcm_capture = !dai_link->playback_only;
                                }
                        }

                        /*
                         * override any BE fixups
                         * see
                         *      snd_soc_link_be_hw_params_fixup()
                         */
                        dai_link->be_hw_params_fixup =
                                component->driver->be_hw_params_fixup;

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

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

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

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

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

#define soc_setup_card_name(name, name1, name2, norm)           \
        __soc_setup_card_name(name, sizeof(name), name1, name2, norm)
static void __soc_setup_card_name(char *name, int len,
                                  const char *name1, const char *name2,
                                  int normalization)
{
        int i;

        snprintf(name, len, "%s", name1 ? name1 : name2);

        if (!normalization)
                return;

        /*
         * Name normalization
         *
         * The driver name is somewhat special, as it's used as a key for
         * searches in the user-space.
         *
         * ex)
         *      "abcd??efg" -> "abcd__efg"
         */
        for (i = 0; i < len; i++) {
                switch (name[i]) {
                case '_':
                case '-':
                case '\0':
                        break;
                default:
                        if (!isalnum(name[i]))
                                name[i] = '_';
                        break;
                }
        }
}

static void soc_cleanup_card_resources(struct snd_soc_card *card)
{
        struct snd_soc_pcm_runtime *rtd, *n;

        if (card->snd_card)
                snd_card_disconnect_sync(card->snd_card);

        snd_soc_dapm_shutdown(card);

        /* remove and free each DAI */
        soc_remove_link_dais(card);
        soc_remove_link_components(card);

        for_each_card_rtds_safe(card, rtd, n)
                snd_soc_remove_pcm_runtime(card, rtd);

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

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

        /* remove the card */
        snd_soc_card_remove(card);

        if (card->snd_card) {
                snd_card_free(card->snd_card);
                card->snd_card = NULL;
        }
}

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

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

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

        mutex_lock(&client_mutex);
        mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_INIT);

        snd_soc_dapm_init(&card->dapm, card, NULL);

        /* check whether any platform is ignore machine FE and using topology */
        soc_check_tplg_fes(card);

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

        /* add predefined DAI links to the list */
        card->num_rtd = 0;
        for_each_card_prelinks(card, i, dai_link) {
                ret = snd_soc_add_pcm_runtime(card, dai_link);
                if (ret < 0)
                        goto probe_end;
        }

        /* card bind complete so register a sound card */
        ret = snd_card_new(card->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
                        card->owner, 0, &card->snd_card);
        if (ret < 0) {
                dev_err(card->dev,
                        "ASoC: can't create sound card for card %s: %d\n",
                        card->name, ret);
                goto probe_end;
        }

        soc_init_card_debugfs(card);

        soc_resume_init(card);

        ret = snd_soc_dapm_new_controls(&card->dapm, card->dapm_widgets,
                                        card->num_dapm_widgets);
        if (ret < 0)
                goto probe_end;

        ret = snd_soc_dapm_new_controls(&card->dapm, card->of_dapm_widgets,
                                        card->num_of_dapm_widgets);
        if (ret < 0)
                goto probe_end;

        /* initialise the sound card only once */
        ret = snd_soc_card_probe(card);
        if (ret < 0)
                goto probe_end;

        /* probe all components used by DAI links on this card */
        ret = soc_probe_link_components(card);
        if (ret < 0) {
                dev_err(card->dev,
                        "ASoC: failed to instantiate card %d\n", ret);
                goto probe_end;
        }

        /* probe auxiliary components */
        ret = soc_probe_aux_devices(card);
        if (ret < 0) {
                dev_err(card->dev,
                        "ASoC: failed to probe aux component %d\n", ret);
                goto probe_end;
        }

        /* probe all DAI links on this card */
        ret = soc_probe_link_dais(card);
        if (ret < 0) {
                dev_err(card->dev,
                        "ASoC: failed to instantiate card %d\n", ret);
                goto probe_end;
        }

        for_each_card_rtds(card, rtd) {
                ret = soc_init_pcm_runtime(card, rtd);
                if (ret < 0)
                        goto probe_end;
        }

        snd_soc_dapm_link_dai_widgets(card);
        snd_soc_dapm_connect_dai_link_widgets(card);

        ret = snd_soc_add_card_controls(card, card->controls,
                                        card->num_controls);
        if (ret < 0)
                goto probe_end;

        ret = snd_soc_dapm_add_routes(&card->dapm, card->dapm_routes,
                                      card->num_dapm_routes);
        if (ret < 0) {
                if (card->disable_route_checks) {
                        dev_info(card->dev,
                                 "%s: disable_route_checks set, ignoring errors on add_routes\n",
                                 __func__);
                } else {
                        dev_err(card->dev,
                                 "%s: snd_soc_dapm_add_routes failed: %d\n",
                                 __func__, ret);
                        goto probe_end;
                }
        }

        ret = snd_soc_dapm_add_routes(&card->dapm, card->of_dapm_routes,
                                      card->num_of_dapm_routes);
        if (ret < 0)
                goto probe_end;

        /* try to set some sane longname if DMI is available */
        snd_soc_set_dmi_name(card, NULL);

        soc_setup_card_name(card->snd_card->shortname,
                            card->name, NULL, 0);
        soc_setup_card_name(card->snd_card->longname,
                            card->long_name, card->name, 0);
        soc_setup_card_name(card->snd_card->driver,
                            card->driver_name, card->name, 1);

        if (card->components) {
                /* the current implementation of snd_component_add() accepts */
                /* multiple components in the string separated by space, */
                /* but the string collision (identical string) check might */
                /* not work correctly */
                ret = snd_component_add(card->snd_card, card->components);
                if (ret < 0) {
                        dev_err(card->dev, "ASoC: %s snd_component_add() failed: %d\n",
                                card->name, ret);
                        goto probe_end;
                }
        }

        ret = snd_soc_card_late_probe(card);
        if (ret < 0)
                goto probe_end;

        snd_soc_dapm_new_widgets(card);

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

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

        /* deactivate pins to sleep state */
        for_each_card_components(card, component)
                if (!snd_soc_component_active(component))
                        pinctrl_pm_select_sleep_state(component->dev);

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

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

        return ret;
}

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

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

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

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

        return devm_snd_soc_register_card(&pdev->dev, card);
}

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