ASoC: soc-core: verify Sound Card normality

[mirror_ubuntu-artful-kernel.git] / sound / soc / soc-core.c

/*
 * 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>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 *  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 <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(platform_list);
static LIST_HEAD(codec_list);
static LIST_HEAD(component_list);

/*
 * 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)");

/* returns the minimum number of bytes needed to represent
 * a particular given value */
static int min_bytes_needed(unsigned long val)
{
        int c = 0;
        int i;

        for (i = (sizeof val * 8) - 1; i >= 0; --i, ++c)
                if (val & (1UL << i))
                        break;
        c = (sizeof val * 8) - c;
        if (!c || (c % 8))
                c = (c + 8) / 8;
        else
                c /= 8;
        return c;
}

/* fill buf which is 'len' bytes with a formatted
 * string of the form 'reg: value\n' */
static int format_register_str(struct snd_soc_codec *codec,
                               unsigned int reg, char *buf, size_t len)
{
        int wordsize = min_bytes_needed(codec->driver->reg_cache_size) * 2;
        int regsize = codec->driver->reg_word_size * 2;
        int ret;

        /* +2 for ': ' and + 1 for '\n' */
        if (wordsize + regsize + 2 + 1 != len)
                return -EINVAL;

        sprintf(buf, "%.*x: ", wordsize, reg);
        buf += wordsize + 2;

        ret = snd_soc_read(codec, reg);
        if (ret < 0)
                memset(buf, 'X', regsize);
        else
                sprintf(buf, "%.*x", regsize, ret);
        buf[regsize] = '\n';
        /* no NUL-termination needed */
        return 0;
}

/* codec register dump */
static ssize_t soc_codec_reg_show(struct snd_soc_codec *codec, char *buf,
                                  size_t count, loff_t pos)
{
        int i, step = 1;
        int wordsize, regsize;
        int len;
        size_t total = 0;
        loff_t p = 0;

        wordsize = min_bytes_needed(codec->driver->reg_cache_size) * 2;
        regsize = codec->driver->reg_word_size * 2;

        len = wordsize + regsize + 2 + 1;

        if (!codec->driver->reg_cache_size)
                return 0;

        if (codec->driver->reg_cache_step)
                step = codec->driver->reg_cache_step;

        for (i = 0; i < codec->driver->reg_cache_size; i += step) {
                /* only support larger than PAGE_SIZE bytes debugfs
                 * entries for the default case */
                if (p >= pos) {
                        if (total + len >= count - 1)
                                break;
                        format_register_str(codec, i, buf + total, len);
                        total += len;
                }
                p += len;
        }

        total = min(total, count - 1);

        return total;
}

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

        return soc_codec_reg_show(rtd->codec, buf, PAGE_SIZE, 0);
}

static DEVICE_ATTR(codec_reg, 0444, codec_reg_show, NULL);

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_codec_reg.attr,
        &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->codec ? 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_roup = {
        .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_roup,
        NULL
};

#ifdef CONFIG_DEBUG_FS
static ssize_t codec_reg_read_file(struct file *file, char __user *user_buf,
                                   size_t count, loff_t *ppos)
{
        ssize_t ret;
        struct snd_soc_codec *codec = file->private_data;
        char *buf;

        if (*ppos < 0 || !count)
                return -EINVAL;

        buf = kmalloc(count, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        ret = soc_codec_reg_show(codec, buf, count, *ppos);
        if (ret >= 0) {
                if (copy_to_user(user_buf, buf, ret)) {
                        kfree(buf);
                        return -EFAULT;
                }
                *ppos += ret;
        }

        kfree(buf);
        return ret;
}

static ssize_t codec_reg_write_file(struct file *file,
                const char __user *user_buf, size_t count, loff_t *ppos)
{
        char buf[32];
        size_t buf_size;
        char *start = buf;
        unsigned long reg, value;
        struct snd_soc_codec *codec = file->private_data;
        int ret;

        buf_size = min(count, (sizeof(buf)-1));
        if (copy_from_user(buf, user_buf, buf_size))
                return -EFAULT;
        buf[buf_size] = 0;

        while (*start == ' ')
                start++;
        reg = simple_strtoul(start, &start, 16);
        while (*start == ' ')
                start++;
        ret = kstrtoul(start, 16, &value);
        if (ret)
                return ret;

        /* Userspace has been fiddling around behind the kernel's back */
        add_taint(TAINT_USER, LOCKDEP_NOW_UNRELIABLE);

        snd_soc_write(codec, reg, value);
        return buf_size;
}

static const struct file_operations codec_reg_fops = {
        .open = simple_open,
        .read = codec_reg_read_file,
        .write = codec_reg_write_file,
        .llseek = default_llseek,
};

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

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

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

        if (!component->debugfs_root) {
                dev_warn(component->dev,
                        "ASoC: Failed to create component debugfs directory\n");
                return;
        }

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

        if (component->init_debugfs)
                component->init_debugfs(component);
}

static void soc_cleanup_component_debugfs(struct snd_soc_component *component)
{
        debugfs_remove_recursive(component->debugfs_root);
}

static void soc_init_codec_debugfs(struct snd_soc_component *component)
{
        struct snd_soc_codec *codec = snd_soc_component_to_codec(component);

        codec->debugfs_reg = debugfs_create_file("codec_reg", 0644,
                                                 codec->component.debugfs_root,
                                                 codec, &codec_reg_fops);
        if (!codec->debugfs_reg)
                dev_warn(codec->dev,
                        "ASoC: Failed to create codec register debugfs file\n");
}

static ssize_t codec_list_read_file(struct file *file, char __user *user_buf,
                                    size_t count, loff_t *ppos)
{
        char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
        ssize_t len, ret = 0;
        struct snd_soc_codec *codec;

        if (!buf)
                return -ENOMEM;

        mutex_lock(&client_mutex);

        list_for_each_entry(codec, &codec_list, list) {
                len = snprintf(buf + ret, PAGE_SIZE - ret, "%s\n",
                               codec->component.name);
                if (len >= 0)
                        ret += len;
                if (ret > PAGE_SIZE) {
                        ret = PAGE_SIZE;
                        break;
                }
        }

        mutex_unlock(&client_mutex);

        if (ret >= 0)
                ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);

        kfree(buf);

        return ret;
}

static const struct file_operations codec_list_fops = {
        .read = codec_list_read_file,
        .llseek = default_llseek,/* read accesses f_pos */
};

static ssize_t dai_list_read_file(struct file *file, char __user *user_buf,
                                  size_t count, loff_t *ppos)
{
        char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
        ssize_t len, ret = 0;
        struct snd_soc_component *component;
        struct snd_soc_dai *dai;

        if (!buf)
                return -ENOMEM;

        mutex_lock(&client_mutex);

        list_for_each_entry(component, &component_list, list) {
                list_for_each_entry(dai, &component->dai_list, list) {
                        len = snprintf(buf + ret, PAGE_SIZE - ret, "%s\n",
                                dai->name);
                        if (len >= 0)
                                ret += len;
                        if (ret > PAGE_SIZE) {
                                ret = PAGE_SIZE;
                                break;
                        }
                }
        }

        mutex_unlock(&client_mutex);

        ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);

        kfree(buf);

        return ret;
}

static const struct file_operations dai_list_fops = {
        .read = dai_list_read_file,
        .llseek = default_llseek,/* read accesses f_pos */
};

static ssize_t platform_list_read_file(struct file *file,
                                       char __user *user_buf,
                                       size_t count, loff_t *ppos)
{
        char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
        ssize_t len, ret = 0;
        struct snd_soc_platform *platform;

        if (!buf)
                return -ENOMEM;

        mutex_lock(&client_mutex);

        list_for_each_entry(platform, &platform_list, list) {
                len = snprintf(buf + ret, PAGE_SIZE - ret, "%s\n",
                               platform->component.name);
                if (len >= 0)
                        ret += len;
                if (ret > PAGE_SIZE) {
                        ret = PAGE_SIZE;
                        break;
                }
        }

        mutex_unlock(&client_mutex);

        ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);

        kfree(buf);

        return ret;
}

static const struct file_operations platform_list_fops = {
        .read = platform_list_read_file,
        .llseek = default_llseek,/* read accesses f_pos */
};

static void soc_init_card_debugfs(struct snd_soc_card *card)
{
        if (!snd_soc_debugfs_root)
                return;

        card->debugfs_card_root = debugfs_create_dir(card->name,
                                                     snd_soc_debugfs_root);
        if (!card->debugfs_card_root) {
                dev_warn(card->dev,
                         "ASoC: Failed to create card debugfs directory\n");
                return;
        }

        card->debugfs_pop_time = debugfs_create_u32("dapm_pop_time", 0644,
                                                    card->debugfs_card_root,
                                                    &card->pop_time);
        if (!card->debugfs_pop_time)
                dev_warn(card->dev,
                       "ASoC: Failed to create pop time debugfs file\n");
}

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


static void snd_soc_debugfs_init(void)
{
        snd_soc_debugfs_root = debugfs_create_dir("asoc", NULL);
        if (IS_ERR(snd_soc_debugfs_root) || !snd_soc_debugfs_root) {
                pr_warn("ASoC: Failed to create debugfs directory\n");
                snd_soc_debugfs_root = NULL;
                return;
        }

        if (!debugfs_create_file("codecs", 0444, snd_soc_debugfs_root, NULL,
                                 &codec_list_fops))
                pr_warn("ASoC: Failed to create CODEC list debugfs file\n");

        if (!debugfs_create_file("dais", 0444, snd_soc_debugfs_root, NULL,
                                 &dai_list_fops))
                pr_warn("ASoC: Failed to create DAI list debugfs file\n");

        if (!debugfs_create_file("platforms", 0444, snd_soc_debugfs_root, NULL,
                                 &platform_list_fops))
                pr_warn("ASoC: Failed to create platform list debugfs file\n");
}

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

#else

#define soc_init_codec_debugfs NULL

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

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;

        list_for_each_entry(rtd, &card->rtd_list, list) {
                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 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;

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

        return rtd;
}

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

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

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

        list_for_each_entry_safe(rtd, _rtd, &card->rtd_list, list) {
                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;

        list_for_each_entry(rtd, &card->rtd_list, list) {
                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 codec2codec_close_delayed_work(struct work_struct *work)
{
        /* Currently nothing to do for c2c links
         * Since c2c links are internal nodes in the DAPM graph and
         * don't interface with the outside world or application layer
         * we don't have to do any special handling on close.
         */
}

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

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

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

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

        /* mute any active DACs */
        list_for_each_entry(rtd, &card->rtd_list, list) {

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

                for (i = 0; i < rtd->num_codecs; i++) {
                        struct snd_soc_dai *dai = rtd->codec_dais[i];
                        struct snd_soc_dai_driver *drv = dai->driver;

                        if (drv->ops->digital_mute && dai->playback_active)
                                drv->ops->digital_mute(dai, 1);
                }
        }

        /* suspend all pcms */
        list_for_each_entry(rtd, &card->rtd_list, list) {
                if (rtd->dai_link->ignore_suspend)
                        continue;

                snd_pcm_suspend_all(rtd->pcm);
        }

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

        list_for_each_entry(rtd, &card->rtd_list, list) {
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;

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

                if (cpu_dai->driver->suspend && !cpu_dai->driver->bus_control)
                        cpu_dai->driver->suspend(cpu_dai);
        }

        /* close any waiting streams */
        list_for_each_entry(rtd, &card->rtd_list, list)
                flush_delayed_work(&rtd->delayed_work);

        list_for_each_entry(rtd, &card->rtd_list, list) {

                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 */
        list_for_each_entry(component, &card->component_dev_list, card_list) {
                struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);

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

                        case SND_SOC_BIAS_OFF:
                                if (component->suspend)
                                        component->suspend(component);
                                component->suspended = 1;
                                if (component->regmap)
                                        regcache_mark_dirty(component->regmap);
                                /* deactivate pins to sleep state */
                                pinctrl_pm_select_sleep_state(component->dev);
                                break;
                        default:
                                dev_dbg(component->dev,
                                        "ASoC: COMPONENT is on over suspend\n");
                                break;
                        }
                }
        }

        list_for_each_entry(rtd, &card->rtd_list, list) {
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;

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

                if (cpu_dai->driver->suspend && cpu_dai->driver->bus_control)
                        cpu_dai->driver->suspend(cpu_dai);

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

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

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_suspend);

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

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

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

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

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

        /* resume control bus DAIs */
        list_for_each_entry(rtd, &card->rtd_list, list) {
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;

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

                if (cpu_dai->driver->resume && cpu_dai->driver->bus_control)
                        cpu_dai->driver->resume(cpu_dai);
        }

        list_for_each_entry(component, &card->component_dev_list, card_list) {
                if (component->suspended) {
                        if (component->resume)
                                component->resume(component);
                        component->suspended = 0;
                }
        }

        list_for_each_entry(rtd, &card->rtd_list, list) {

                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 */
        list_for_each_entry(rtd, &card->rtd_list, list) {

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

                for (i = 0; i < rtd->num_codecs; i++) {
                        struct snd_soc_dai *dai = rtd->codec_dais[i];
                        struct snd_soc_dai_driver *drv = dai->driver;

                        if (drv->ops->digital_mute && dai->playback_active)
                                drv->ops->digital_mute(dai, 0);
                }
        }

        list_for_each_entry(rtd, &card->rtd_list, list) {
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;

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

                if (cpu_dai->driver->resume && !cpu_dai->driver->bus_control)
                        cpu_dai->driver->resume(cpu_dai);
        }

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

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

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

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

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

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

        /* activate pins from sleep state */
        list_for_each_entry(rtd, &card->rtd_list, list) {
                struct snd_soc_dai **codec_dais = rtd->codec_dais;
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
                int j;

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

                for (j = 0; j < rtd->num_codecs; j++) {
                        struct snd_soc_dai *codec_dai = codec_dais[j];
                        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.
         */
        list_for_each_entry(rtd, &card->rtd_list, list) {
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
                bus_control |= cpu_dai->driver->bus_control;
        }
        if (bus_control) {
                dev_dbg(dev, "ASoC: Resuming control bus master immediately\n");
                soc_resume_deferred(&card->deferred_resume_work);
        } else {
                dev_dbg(dev, "ASoC: Scheduling resume work\n");
                if (!schedule_work(&card->deferred_resume_work))
                        dev_err(dev, "ASoC: resume work item may be lost\n");
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_resume);
#else
#define snd_soc_suspend NULL
#define snd_soc_resume NULL
#endif

static const struct snd_soc_dai_ops null_dai_ops = {
};

static struct snd_soc_component *soc_find_component(
        const struct device_node *of_node, const char *name)
{
        struct snd_soc_component *component;

        lockdep_assert_held(&client_mutex);

        list_for_each_entry(component, &component_list, list) {
                if (of_node) {
                        if (component->dev->of_node == of_node)
                                return component;
                } else if (strcmp(component->name, name) == 0) {
                        return component;
                }
        }

        return NULL;
}

/**
 * snd_soc_find_dai - Find a registered DAI
 *
 * @dlc: name of the DAI and optional component info to match
 *
 * This function will search all regsitered 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;
        struct device_node *component_of_node;

        lockdep_assert_held(&client_mutex);

        /* Find CPU DAI from registered DAIs*/
        list_for_each_entry(component, &component_list, list) {
                component_of_node = component->dev->of_node;
                if (!component_of_node && component->dev->parent)
                        component_of_node = component->dev->parent->of_node;

                if (dlc->of_node && component_of_node != dlc->of_node)
                        continue;
                if (dlc->name && strcmp(component->name, dlc->name))
                        continue;
                list_for_each_entry(dai, &component->dai_list, list) {
                        if (dlc->dai_name && strcmp(dai->name, dlc->dai_name))
                                continue;

                        return dai;
                }
        }

        return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_find_dai);


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

        lockdep_assert_held(&client_mutex);

        list_for_each_entry_safe(link, _link, &card->dai_link_list, list) {
                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;

        list_for_each_entry(rtd, &card->rtd_list, list) {
                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 *codecs = dai_link->codecs;
        struct snd_soc_dai_link_component cpu_dai_component;
        struct snd_soc_dai **codec_dais;
        struct snd_soc_platform *platform;
        struct device_node *platform_of_node;
        const char *platform_name;
        int i;

        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;

        cpu_dai_component.name = dai_link->cpu_name;
        cpu_dai_component.of_node = dai_link->cpu_of_node;
        cpu_dai_component.dai_name = dai_link->cpu_dai_name;
        rtd->cpu_dai = snd_soc_find_dai(&cpu_dai_component);
        if (!rtd->cpu_dai) {
                dev_err(card->dev, "ASoC: CPU DAI %s not registered\n",
                        dai_link->cpu_dai_name);
                goto _err_defer;
        }

        rtd->num_codecs = dai_link->num_codecs;

        /* Find CODEC from registered CODECs */
        codec_dais = rtd->codec_dais;
        for (i = 0; i < rtd->num_codecs; i++) {
                codec_dais[i] = snd_soc_find_dai(&codecs[i]);
                if (!codec_dais[i]) {
                        dev_err(card->dev, "ASoC: CODEC DAI %s not registered\n",
                                codecs[i].dai_name);
                        goto _err_defer;
                }
        }

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

        /* if there's no platform we match on the empty platform */
        platform_name = dai_link->platform_name;
        if (!platform_name && !dai_link->platform_of_node)
                platform_name = "snd-soc-dummy";

        /* find one from the set of registered platforms */
        list_for_each_entry(platform, &platform_list, list) {
                platform_of_node = platform->dev->of_node;
                if (!platform_of_node && platform->dev->parent->of_node)
                        platform_of_node = platform->dev->parent->of_node;

                if (dai_link->platform_of_node) {
                        if (platform_of_node != dai_link->platform_of_node)
                                continue;
                } else {
                        if (strcmp(platform->component.name, platform_name))
                                continue;
                }

                rtd->platform = platform;
        }
        if (!rtd->platform) {
                dev_err(card->dev, "ASoC: platform %s not registered\n",
                        dai_link->platform_name);
                goto _err_defer;
        }

        soc_add_pcm_runtime(card, rtd);
        return 0;

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

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

        list_del(&component->card_list);

        if (component->remove)
                component->remove(component);

        snd_soc_dapm_free(snd_soc_component_get_dapm(component));

        soc_cleanup_component_debugfs(component);
        component->card = NULL;
        module_put(component->dev->driver->owner);
}

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

        if (dai && dai->probed &&
                        dai->driver->remove_order == order) {
                if (dai->driver->remove) {
                        err = dai->driver->remove(dai);
                        if (err < 0)
                                dev_err(dai->dev,
                                        "ASoC: failed to remove %s: %d\n",
                                        dai->name, err);
                }
                dai->probed = 0;
        }
}

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

        /* unregister the rtd device */
        if (rtd->dev_registered) {
                device_unregister(rtd->dev);
                rtd->dev_registered = 0;
        }

        /* remove the CODEC DAI */
        for (i = 0; i < rtd->num_codecs; i++)
                soc_remove_dai(rtd->codec_dais[i], order);

        soc_remove_dai(rtd->cpu_dai, order);
}

static void soc_remove_link_components(struct snd_soc_card *card,
        struct snd_soc_pcm_runtime *rtd, int order)
{
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_component *component;
        int i;

        /* remove the platform */
        if (platform && platform->component.driver->remove_order == order)
                soc_remove_component(&platform->component);

        /* remove the CODEC-side CODEC */
        for (i = 0; i < rtd->num_codecs; i++) {
                component = rtd->codec_dais[i]->component;
                if (component->driver->remove_order == order)
                        soc_remove_component(component);
        }

        /* remove any CPU-side CODEC */
        if (cpu_dai) {
                if (cpu_dai->component->driver->remove_order == order)
                        soc_remove_component(cpu_dai->component);
        }
}

static void soc_remove_dai_links(struct snd_soc_card *card)
{
        int order;
        struct snd_soc_pcm_runtime *rtd;
        struct snd_soc_dai_link *link, *_link;

        for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
                        order++) {
                list_for_each_entry(rtd, &card->rtd_list, list)
                        soc_remove_link_dais(card, rtd, order);
        }

        for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
                        order++) {
                list_for_each_entry(rtd, &card->rtd_list, list)
                        soc_remove_link_components(card, rtd, order);
        }

        list_for_each_entry_safe(link, _link, &card->dai_link_list, list) {
                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);
                card->num_dai_links--;
        }
}

static int snd_soc_init_multicodec(struct snd_soc_card *card,
                                   struct snd_soc_dai_link *dai_link)
{
        /* Legacy codec/codec_dai link is a single entry in multicodec */
        if (dai_link->codec_name || dai_link->codec_of_node ||
            dai_link->codec_dai_name) {
                dai_link->num_codecs = 1;

                dai_link->codecs = devm_kzalloc(card->dev,
                                sizeof(struct snd_soc_dai_link_component),
                                GFP_KERNEL);
                if (!dai_link->codecs)
                        return -ENOMEM;

                dai_link->codecs[0].name = dai_link->codec_name;
                dai_link->codecs[0].of_node = dai_link->codec_of_node;
                dai_link->codecs[0].dai_name = dai_link->codec_dai_name;
        }

        if (!dai_link->codecs) {
                dev_err(card->dev, "ASoC: DAI link has no CODECs\n");
                return -EINVAL;
        }

        return 0;
}

static int soc_init_dai_link(struct snd_soc_card *card,
                                   struct snd_soc_dai_link *link)
{
        int i, ret;

        ret = snd_soc_init_multicodec(card, link);
        if (ret) {
                dev_err(card->dev, "ASoC: failed to init multicodec\n");
                return ret;
        }

        for (i = 0; i < link->num_codecs; i++) {
                /*
                 * Codec must be specified by 1 of name or OF node,
                 * not both or neither.
                 */
                if (!!link->codecs[i].name ==
                    !!link->codecs[i].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 (!link->codecs[i].dai_name) {
                        dev_err(card->dev, "ASoC: codec_dai_name not set for %s\n",
                                link->name);
                        return -EINVAL;
                }
        }

        /*
         * Platform may be specified by either name or OF node, but
         * can be left unspecified, and a dummy platform will be used.
         */
        if (link->platform_name && link->platform_of_node) {
                dev_err(card->dev,
                        "ASoC: Both platform name/of_node are set for %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->cpu_name && link->cpu_of_node) {
                dev_err(card->dev,
                        "ASoC: Neither/both cpu name/of_node are set for %s\n",
                        link->name);
                return -EINVAL;
        }
        /*
         * At least one of CPU DAI name or CPU device name/node must be
         * specified
         */
        if (!link->cpu_dai_name &&
            !(link->cpu_name || link->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_add_dai_link - Add a DAI link dynamically
 * @card: The ASoC card to which the DAI link is added
 * @dai_link: The new DAI link to add
 *
 * This function adds a DAI link to the ASoC card's link list.
 *
 * Note: Topology can use this API to add DAI links when probing the
 * topology component. And machine drivers can still define static
 * DAI links in dai_link array.
 */
int snd_soc_add_dai_link(struct snd_soc_card *card,
                struct snd_soc_dai_link *dai_link)
{
        if (dai_link->dobj.type
            && dai_link->dobj.type != SND_SOC_DOBJ_DAI_LINK) {
                dev_err(card->dev, "Invalid dai link type %d\n",
                        dai_link->dobj.type);
                return -EINVAL;
        }

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

        list_add_tail(&dai_link->list, &card->dai_link_list);
        card->num_dai_links++;

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_add_dai_link);

/**
 * snd_soc_remove_dai_link - Remove a DAI link from the list
 * @card: The ASoC card that owns the link
 * @dai_link: The DAI link to remove
 *
 * This function removes a DAI link from the ASoC card's link list.
 *
 * For DAI links previously added by topology, topology should
 * remove them by using the dobj embedded in the link.
 */
void snd_soc_remove_dai_link(struct snd_soc_card *card,
                             struct snd_soc_dai_link *dai_link)
{
        struct snd_soc_dai_link *link, *_link;

        if (dai_link->dobj.type
            && dai_link->dobj.type != SND_SOC_DOBJ_DAI_LINK) {
                dev_err(card->dev, "Invalid dai link type %d\n",
                        dai_link->dobj.type);
                return;
        }

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

        list_for_each_entry_safe(link, _link, &card->dai_link_list, list) {
                if (link == dai_link) {
                        list_del(&link->list);
                        card->num_dai_links--;
                        return;
                }
        }
}
EXPORT_SYMBOL_GPL(snd_soc_remove_dai_link);

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

        if (card->codec_conf == NULL)
                return;

        for (i = 0; i < card->num_configs; i++) {
                struct snd_soc_codec_conf *map = &card->codec_conf[i];
                if (map->of_node && component->dev->of_node != map->of_node)
                        continue;
                if (map->dev_name && strcmp(component->name, map->dev_name))
                        continue;
                component->name_prefix = map->name_prefix;
                break;
        }
}

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

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

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

        if (!try_module_get(component->dev->driver->owner))
                return -ENODEV;

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

        soc_init_component_debugfs(component);

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

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

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

        if (component->probe) {
                ret = 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;
                }
        }

        if (component->controls)
                snd_soc_add_component_controls(component, component->controls,
                                     component->num_controls);
        if (component->dapm_routes)
                snd_soc_dapm_add_routes(dapm, component->dapm_routes,
                                        component->num_dapm_routes);

        list_add(&dapm->list, &card->dapm_list);
        list_add(&component->card_list, &card->component_dev_list);

        return 0;

err_probe:
        soc_cleanup_component_debugfs(component);
        component->card = NULL;
        module_put(component->dev->driver->owner);

        return ret;
}

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

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

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

static int soc_probe_link_components(struct snd_soc_card *card,
                        struct snd_soc_pcm_runtime *rtd,
                                     int order)
{
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_component *component;
        int i, ret;

        /* probe the CPU-side component, if it is a CODEC */
        component = rtd->cpu_dai->component;
        if (component->driver->probe_order == order) {
                ret = soc_probe_component(card, component);
                if (ret < 0)
                        return ret;
        }

        /* probe the CODEC-side components */
        for (i = 0; i < rtd->num_codecs; i++) {
                component = rtd->codec_dais[i]->component;
                if (component->driver->probe_order == order) {
                        ret = soc_probe_component(card, component);
                        if (ret < 0)
                                return ret;
                }
        }

        /* probe the platform */
        if (platform->component.driver->probe_order == order) {
                ret = soc_probe_component(card, &platform->component);
                if (ret < 0)
                        return ret;
        }

        return 0;
}

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

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

                dai->probed = 1;
        }

        return 0;
}

static int soc_link_dai_widgets(struct snd_soc_card *card,
                                struct snd_soc_dai_link *dai_link,
                                struct snd_soc_pcm_runtime *rtd)
{
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        struct snd_soc_dai *codec_dai = rtd->codec_dai;
        struct snd_soc_dapm_widget *sink, *source;
        int ret;

        if (rtd->num_codecs > 1)
                dev_warn(card->dev, "ASoC: Multiple codecs not supported yet\n");

        /* link the DAI widgets */
        sink = codec_dai->playback_widget;
        source = cpu_dai->capture_widget;
        if (sink && source) {
                ret = snd_soc_dapm_new_pcm(card, dai_link->params,
                                           dai_link->num_params,
                                           source, sink);
                if (ret != 0) {
                        dev_err(card->dev, "ASoC: Can't link %s to %s: %d\n",
                                sink->name, source->name, ret);
                        return ret;
                }
        }

        sink = cpu_dai->playback_widget;
        source = codec_dai->capture_widget;
        if (sink && source) {
                ret = snd_soc_dapm_new_pcm(card, dai_link->params,
                                           dai_link->num_params,
                                           source, sink);
                if (ret != 0) {
                        dev_err(card->dev, "ASoC: Can't link %s to %s: %d\n",
                                sink->name, source->name, ret);
                        return ret;
                }
        }

        return 0;
}

static int soc_probe_link_dais(struct snd_soc_card *card,
                struct snd_soc_pcm_runtime *rtd, int order)
{
        struct snd_soc_dai_link *dai_link = rtd->dai_link;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        int i, ret;

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

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

        ret = soc_probe_dai(cpu_dai, order);
        if (ret)
                return ret;

        /* probe the CODEC DAI */
        for (i = 0; i < rtd->num_codecs; i++) {
                ret = soc_probe_dai(rtd->codec_dais[i], order);
                if (ret)
                        return ret;
        }

        /* complete DAI probe during last probe */
        if (order != SND_SOC_COMP_ORDER_LAST)
                return 0;

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

        if (dai_link->dai_fmt)
                snd_soc_runtime_set_dai_fmt(rtd, dai_link->dai_fmt);

        ret = soc_post_component_init(rtd, dai_link->name);
        if (ret)
                return ret;

#ifdef CONFIG_DEBUG_FS
        /* add DPCM sysfs entries */
        if (dai_link->dynamic)
                soc_dpcm_debugfs_add(rtd);
#endif

        if (cpu_dai->driver->compress_new) {
                /*create compress_device"*/
                ret = cpu_dai->driver->compress_new(rtd, rtd->num);
                if (ret < 0) {
                        dev_err(card->dev, "ASoC: can't create compress %s\n",
                                         dai_link->stream_name);
                        return ret;
                }
        } else {

                if (!dai_link->params) {
                        /* create the pcm */
                        ret = soc_new_pcm(rtd, rtd->num);
                        if (ret < 0) {
                                dev_err(card->dev, "ASoC: can't create pcm %s :%d\n",
                                       dai_link->stream_name, ret);
                                return ret;
                        }
                } else {
                        INIT_DELAYED_WORK(&rtd->delayed_work,
                                                codec2codec_close_delayed_work);

                        /* link the DAI widgets */
                        ret = soc_link_dai_widgets(card, dai_link, rtd);
                        if (ret)
                                return ret;
                }
        }

        return 0;
}

static int soc_bind_aux_dev(struct snd_soc_card *card, int num)
{
        struct snd_soc_aux_dev *aux_dev = &card->aux_dev[num];
        struct snd_soc_component *component;
        const char *name;
        struct device_node *codec_of_node;

        if (aux_dev->codec_of_node || aux_dev->codec_name) {
                /* codecs, usually analog devices */
                name = aux_dev->codec_name;
                codec_of_node = aux_dev->codec_of_node;
                component = soc_find_component(codec_of_node, name);
                if (!component) {
                        if (codec_of_node)
                                name = of_node_full_name(codec_of_node);
                        goto err_defer;
                }
        } else if (aux_dev->name) {
                /* generic components */
                name = aux_dev->name;
                component = soc_find_component(NULL, name);
                if (!component)
                        goto err_defer;
        } else {
                dev_err(card->dev, "ASoC: Invalid auxiliary device\n");
                return -EINVAL;
        }

        component->init = aux_dev->init;
        component->auxiliary = 1;

        return 0;

err_defer:
        dev_err(card->dev, "ASoC: %s not registered\n", name);
        return -EPROBE_DEFER;
}

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

        for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
                order++) {
                list_for_each_entry(comp, &card->component_dev_list, card_list) {
                        if (!comp->auxiliary)
                                continue;

                        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 (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
                order++) {
                list_for_each_entry_safe(comp, _comp,
                        &card->component_dev_list, card_list) {

                        if (!comp->auxiliary)
                                continue;

                        if (comp->driver->remove_order == order) {
                                soc_remove_component(comp);
                                comp->auxiliary = 0;
                        }
                }
        }
}

static int snd_soc_init_codec_cache(struct snd_soc_codec *codec)
{
        int ret;

        if (codec->cache_init)
                return 0;

        ret = snd_soc_cache_init(codec);
        if (ret < 0) {
                dev_err(codec->dev,
                        "ASoC: Failed to set cache compression type: %d\n",
                        ret);
                return ret;
        }
        codec->cache_init = 1;
        return 0;
}

/**
 * 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 **codec_dais = rtd->codec_dais;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        unsigned int i;
        int ret;

        for (i = 0; i < rtd->num_codecs; i++) {
                struct snd_soc_dai *codec_dai = codec_dais[i];

                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 */
        if (cpu_dai->codec) {
                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);

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

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

        /* bind DAIs */
        for (i = 0; i < card->num_links; i++) {
                ret = soc_bind_dai_link(card, &card->dai_link[i]);
                if (ret != 0)
                        goto base_error;
        }

        /* bind aux_devs too */
        for (i = 0; i < card->num_aux_devs; i++) {
                ret = soc_bind_aux_dev(card, i);
                if (ret != 0)
                        goto base_error;
        }

        /* add predefined DAI links to the list */
        for (i = 0; i < card->num_links; i++)
                snd_soc_add_dai_link(card, card->dai_link+i);

        /* initialize the register cache for each available codec */
        list_for_each_entry(codec, &codec_list, list) {
                if (codec->cache_init)
                        continue;
                ret = snd_soc_init_codec_cache(codec);
                if (ret < 0)
                        goto base_error;
        }

        /* 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 base_error;
        }

        soc_init_card_debugfs(card);

        card->dapm.bias_level = SND_SOC_BIAS_OFF;
        card->dapm.dev = card->dev;
        card->dapm.card = card;
        list_add(&card->dapm.list, &card->dapm_list);

#ifdef CONFIG_DEBUG_FS
        snd_soc_dapm_debugfs_init(&card->dapm, card->debugfs_card_root);
#endif

#ifdef CONFIG_PM_SLEEP
        /* deferred resume work */
        INIT_WORK(&card->deferred_resume_work, soc_resume_deferred);
#endif

        if (card->dapm_widgets)
                snd_soc_dapm_new_controls(&card->dapm, card->dapm_widgets,
                                          card->num_dapm_widgets);

        if (card->of_dapm_widgets)
                snd_soc_dapm_new_controls(&card->dapm, card->of_dapm_widgets,
                                          card->num_of_dapm_widgets);

        /* initialise the sound card only once */
        if (card->probe) {
                ret = card->probe(card);
                if (ret < 0)
                        goto card_probe_error;
        }

        /* probe all components used by DAI links on this card */
        for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
                        order++) {
                list_for_each_entry(rtd, &card->rtd_list, list) {
                        ret = soc_probe_link_components(card, rtd, order);
                        if (ret < 0) {
                                dev_err(card->dev,
                                        "ASoC: failed to instantiate card %d\n",
                                        ret);
                                goto probe_dai_err;
                        }
                }
        }

        /* probe auxiliary components */
        ret = soc_probe_aux_devices(card);
        if (ret < 0)
                goto probe_dai_err;

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

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

        /* probe all DAI links on this card */
        for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
                        order++) {
                list_for_each_entry(rtd, &card->rtd_list, list) {
                        ret = soc_probe_link_dais(card, rtd, order);
                        if (ret < 0) {
                                dev_err(card->dev,
                                        "ASoC: failed to instantiate card %d\n",
                                        ret);
                                goto probe_dai_err;
                        }
                }
        }

        snd_soc_dapm_link_dai_widgets(card);
        snd_soc_dapm_connect_dai_link_widgets(card);

        if (card->controls)
                snd_soc_add_card_controls(card, card->controls, card->num_controls);

        if (card->dapm_routes)
                snd_soc_dapm_add_routes(&card->dapm, card->dapm_routes,
                                        card->num_dapm_routes);

        if (card->of_dapm_routes)
                snd_soc_dapm_add_routes(&card->dapm, card->of_dapm_routes,
                                        card->num_of_dapm_routes);

        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_aux_dev_err;
                }
        }

        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_aux_dev_err;
        }

        card->instantiated = 1;
        snd_soc_dapm_sync(&card->dapm);
        mutex_unlock(&card->mutex);
        mutex_unlock(&client_mutex);

        return 0;

probe_aux_dev_err:
        soc_remove_aux_devices(card);

probe_dai_err:
        soc_remove_dai_links(card);

card_probe_error:
        if (card->remove)
                card->remove(card);

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

base_error:
        soc_remove_pcm_runtimes(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);
}

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

        /* make sure any delayed work runs */
        list_for_each_entry(rtd, &card->rtd_list, list)
                flush_delayed_work(&rtd->delayed_work);

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

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

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

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

        snd_card_free(card->snd_card);
        return 0;

}

/* 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. */
        list_for_each_entry(rtd, &card->rtd_list, list)
                flush_delayed_work(&rtd->delayed_work);

        snd_soc_dapm_shutdown(card);

        /* deactivate pins to sleep state */
        list_for_each_entry(rtd, &card->rtd_list, list) {
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
                int i;

                pinctrl_pm_select_sleep_state(cpu_dai->dev);
                for (i = 0; i < rtd->num_codecs; i++) {
                        struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
                        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_codec_controls - add an array of controls to a codec.
 * Convenience function to add a list of controls. Many codecs were
 * duplicating this code.
 *
 * @codec: codec 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_codec_controls(struct snd_soc_codec *codec,
        const struct snd_kcontrol_new *controls, unsigned int num_controls)
{
        return snd_soc_add_component_controls(&codec->component, controls,
                num_controls);
}
EXPORT_SYMBOL_GPL(snd_soc_add_codec_controls);

/**
 * snd_soc_add_platform_controls - add an array of controls to a platform.
 * Convenience function to add a list of controls.
 *
 * @platform: platform 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_platform_controls(struct snd_soc_platform *platform,
        const struct snd_kcontrol_new *controls, unsigned int num_controls)
{
        return snd_soc_add_component_controls(&platform->component, controls,
                num_controls);
}
EXPORT_SYMBOL_GPL(snd_soc_add_platform_controls);

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

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

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

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

/**
 * snd_soc_dai_set_sysclk - configure DAI system or master clock.
 * @dai: DAI
 * @clk_id: DAI specific clock ID
 * @freq: new clock frequency in Hz
 * @dir: new clock direction - input/output.
 *
 * Configures the DAI master (MCLK) or system (SYSCLK) clocking.
 */
int snd_soc_dai_set_sysclk(struct snd_soc_dai *dai, int clk_id,
        unsigned int freq, int dir)
{
        if (dai->driver && dai->driver->ops->set_sysclk)
                return dai->driver->ops->set_sysclk(dai, clk_id, freq, dir);
        else if (dai->codec && dai->codec->driver->set_sysclk)
                return dai->codec->driver->set_sysclk(dai->codec, clk_id, 0,
                                                      freq, dir);
        else
                return -ENOTSUPP;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_sysclk);

/**
 * snd_soc_codec_set_sysclk - configure CODEC system or master clock.
 * @codec: CODEC
 * @clk_id: DAI specific clock ID
 * @source: Source for the clock
 * @freq: new clock frequency in Hz
 * @dir: new clock direction - input/output.
 *
 * Configures the CODEC master (MCLK) or system (SYSCLK) clocking.
 */
int snd_soc_codec_set_sysclk(struct snd_soc_codec *codec, int clk_id,
                             int source, unsigned int freq, int dir)
{
        if (codec->driver->set_sysclk)
                return codec->driver->set_sysclk(codec, clk_id, source,
                                                 freq, dir);
        else
                return -ENOTSUPP;
}
EXPORT_SYMBOL_GPL(snd_soc_codec_set_sysclk);

/**
 * snd_soc_dai_set_clkdiv - configure DAI clock dividers.
 * @dai: DAI
 * @div_id: DAI specific clock divider ID
 * @div: new clock divisor.
 *
 * Configures the clock dividers. This is used to derive the best DAI bit and
 * frame clocks from the system or master clock. It's best to set the DAI bit
 * and frame clocks as low as possible to save system power.
 */
int snd_soc_dai_set_clkdiv(struct snd_soc_dai *dai,
        int div_id, int div)
{
        if (dai->driver && dai->driver->ops->set_clkdiv)
                return dai->driver->ops->set_clkdiv(dai, div_id, div);
        else
                return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_clkdiv);

/**
 * snd_soc_dai_set_pll - configure DAI PLL.
 * @dai: DAI
 * @pll_id: DAI specific PLL ID
 * @source: DAI specific source for the PLL
 * @freq_in: PLL input clock frequency in Hz
 * @freq_out: requested PLL output clock frequency in Hz
 *
 * Configures and enables PLL to generate output clock based on input clock.
 */
int snd_soc_dai_set_pll(struct snd_soc_dai *dai, int pll_id, int source,
        unsigned int freq_in, unsigned int freq_out)
{
        if (dai->driver && dai->driver->ops->set_pll)
                return dai->driver->ops->set_pll(dai, pll_id, source,
                                         freq_in, freq_out);
        else if (dai->codec && dai->codec->driver->set_pll)
                return dai->codec->driver->set_pll(dai->codec, pll_id, source,
                                                   freq_in, freq_out);
        else
                return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_pll);

/*
 * snd_soc_codec_set_pll - configure codec PLL.
 * @codec: CODEC
 * @pll_id: DAI specific PLL ID
 * @source: DAI specific source for the PLL
 * @freq_in: PLL input clock frequency in Hz
 * @freq_out: requested PLL output clock frequency in Hz
 *
 * Configures and enables PLL to generate output clock based on input clock.
 */
int snd_soc_codec_set_pll(struct snd_soc_codec *codec, int pll_id, int source,
                          unsigned int freq_in, unsigned int freq_out)
{
        if (codec->driver->set_pll)
                return codec->driver->set_pll(codec, pll_id, source,
                                              freq_in, freq_out);
        else
                return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_codec_set_pll);

/**
 * snd_soc_dai_set_bclk_ratio - configure BCLK to sample rate ratio.
 * @dai: DAI
 * @ratio: Ratio of BCLK to Sample rate.
 *
 * Configures the DAI for a preset BCLK to sample rate ratio.
 */
int snd_soc_dai_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio)
{
        if (dai->driver && dai->driver->ops->set_bclk_ratio)
                return dai->driver->ops->set_bclk_ratio(dai, ratio);
        else
                return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_bclk_ratio);

/**
 * snd_soc_dai_set_fmt - configure DAI hardware audio format.
 * @dai: DAI
 * @fmt: SND_SOC_DAIFMT_ format value.
 *
 * Configures the DAI hardware format and clocking.
 */
int snd_soc_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
        if (dai->driver == NULL)
                return -EINVAL;
        if (dai->driver->ops->set_fmt == NULL)
                return -ENOTSUPP;
        return dai->driver->ops->set_fmt(dai, fmt);
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_fmt);

/**
 * snd_soc_xlate_tdm_slot - generate tx/rx slot mask.
 * @slots: Number of slots in use.
 * @tx_mask: bitmask representing active TX slots.
 * @rx_mask: bitmask representing active RX slots.
 *
 * Generates the TDM tx and rx slot default masks for DAI.
 */
static int snd_soc_xlate_tdm_slot_mask(unsigned int slots,
                                          unsigned int *tx_mask,
                                          unsigned int *rx_mask)
{
        if (*tx_mask || *rx_mask)
                return 0;

        if (!slots)
                return -EINVAL;

        *tx_mask = (1 << slots) - 1;
        *rx_mask = (1 << slots) - 1;

        return 0;
}

/**
 * snd_soc_dai_set_tdm_slot() - Configures a DAI for TDM operation
 * @dai: The DAI to configure
 * @tx_mask: bitmask representing active TX slots.
 * @rx_mask: bitmask representing active RX slots.
 * @slots: Number of slots in use.
 * @slot_width: Width in bits for each slot.
 *
 * This function configures the specified DAI for TDM operation. @slot contains
 * the total number of slots of the TDM stream and @slot_with the width of each
 * slot in bit clock cycles. @tx_mask and @rx_mask are bitmasks specifying the
 * active slots of the TDM stream for the specified DAI, i.e. which slots the
 * DAI should write to or read from. If a bit is set the corresponding slot is
 * active, if a bit is cleared the corresponding slot is inactive. Bit 0 maps to
 * the first slot, bit 1 to the second slot and so on. The first active slot
 * maps to the first channel of the DAI, the second active slot to the second
 * channel and so on.
 *
 * TDM mode can be disabled by passing 0 for @slots. In this case @tx_mask,
 * @rx_mask and @slot_width will be ignored.
 *
 * Returns 0 on success, a negative error code otherwise.
 */
int snd_soc_dai_set_tdm_slot(struct snd_soc_dai *dai,
        unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width)
{
        if (dai->driver && dai->driver->ops->xlate_tdm_slot_mask)
                dai->driver->ops->xlate_tdm_slot_mask(slots,
                                                &tx_mask, &rx_mask);
        else
                snd_soc_xlate_tdm_slot_mask(slots, &tx_mask, &rx_mask);

        dai->tx_mask = tx_mask;
        dai->rx_mask = rx_mask;

        if (dai->driver && dai->driver->ops->set_tdm_slot)
                return dai->driver->ops->set_tdm_slot(dai, tx_mask, rx_mask,
                                slots, slot_width);
        else
                return -ENOTSUPP;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_tdm_slot);

/**
 * snd_soc_dai_set_channel_map - configure DAI audio channel map
 * @dai: DAI
 * @tx_num: how many TX channels
 * @tx_slot: pointer to an array which imply the TX slot number channel
 *           0~num-1 uses
 * @rx_num: how many RX channels
 * @rx_slot: pointer to an array which imply the RX slot number channel
 *           0~num-1 uses
 *
 * configure the relationship between channel number and TDM slot number.
 */
int snd_soc_dai_set_channel_map(struct snd_soc_dai *dai,
        unsigned int tx_num, unsigned int *tx_slot,
        unsigned int rx_num, unsigned int *rx_slot)
{
        if (dai->driver && dai->driver->ops->set_channel_map)
                return dai->driver->ops->set_channel_map(dai, tx_num, tx_slot,
                        rx_num, rx_slot);
        else
                return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_channel_map);

/**
 * snd_soc_dai_set_tristate - configure DAI system or master clock.
 * @dai: DAI
 * @tristate: tristate enable
 *
 * Tristates the DAI so that others can use it.
 */
int snd_soc_dai_set_tristate(struct snd_soc_dai *dai, int tristate)
{
        if (dai->driver && dai->driver->ops->set_tristate)
                return dai->driver->ops->set_tristate(dai, tristate);
        else
                return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_tristate);

/**
 * snd_soc_dai_digital_mute - configure DAI system or master clock.
 * @dai: DAI
 * @mute: mute enable
 * @direction: stream to mute
 *
 * Mutes the DAI DAC.
 */
int snd_soc_dai_digital_mute(struct snd_soc_dai *dai, int mute,
                             int direction)
{
        if (!dai->driver)
                return -ENOTSUPP;

        if (dai->driver->ops->mute_stream)
                return dai->driver->ops->mute_stream(dai, mute, direction);
        else if (direction == SNDRV_PCM_STREAM_PLAYBACK &&
                 dai->driver->ops->digital_mute)
                return dai->driver->ops->digital_mute(dai, mute);
        else
                return -ENOTSUPP;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_digital_mute);

/**
 * 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)
{
        int i, ret;
        struct snd_soc_pcm_runtime *rtd;

        if (!card->name || !card->dev)
                return -EINVAL;

        for (i = 0; i < card->num_links; i++) {
                struct snd_soc_dai_link *link = &card->dai_link[i];

                ret = soc_init_dai_link(card, link);
                if (ret) {
                        dev_err(card->dev, "ASoC: failed to init link %s\n",
                                link->name);
                        return ret;
                }
        }

        dev_set_drvdata(card->dev, card);

        snd_soc_initialize_card_lists(card);

        INIT_LIST_HEAD(&card->dai_link_list);
        card->num_dai_links = 0;

        INIT_LIST_HEAD(&card->rtd_list);
        card->num_rtd = 0;

        INIT_LIST_HEAD(&card->dapm_dirty);
        INIT_LIST_HEAD(&card->dobj_list);
        card->instantiated = 0;
        mutex_init(&card->mutex);
        mutex_init(&card->dapm_mutex);

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

        /* deactivate pins to sleep state */
        list_for_each_entry(rtd, &card->rtd_list, list)  {
                struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
                int j;

                for (j = 0; j < rtd->num_codecs; j++) {
                        struct snd_soc_dai *codec_dai = rtd->codec_dais[j];
                        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;
}
EXPORT_SYMBOL_GPL(snd_soc_register_card);

/**
 * snd_soc_unregister_card - Unregister a card with the ASoC core
 *
 * @card: Card to unregister
 *
 */
int snd_soc_unregister_card(struct snd_soc_card *card)
{
        if (card->instantiated) {
                card->instantiated = false;
                snd_soc_dapm_shutdown(card);
                soc_cleanup_card_resources(card);
                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;

        list_for_each_entry_safe(dai, _dai, &component->dai_list, list) {
                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;

        list_add(&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
 * @legacy_dai_naming: Use the legacy naming scheme and let the DAI inherit the
 *                     parent's name.
 */
static int snd_soc_register_dais(struct snd_soc_component *component,
        struct snd_soc_dai_driver *dai_drv, size_t count,
        bool legacy_dai_naming)
{
        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);

        component->dai_drv = dai_drv;

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

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

        return 0;

err:
        snd_soc_unregister_dais(component);

        return ret;
}

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

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

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

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

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_dai);

static void snd_soc_component_seq_notifier(struct snd_soc_dapm_context *dapm,
        enum snd_soc_dapm_type type, int subseq)
{
        struct snd_soc_component *component = dapm->component;

        component->driver->seq_notifier(component, type, subseq);
}

static int snd_soc_component_stream_event(struct snd_soc_dapm_context *dapm,
        int event)
{
        struct snd_soc_component *component = dapm->component;

        return component->driver->stream_event(component, event);
}

static int snd_soc_component_initialize(struct snd_soc_component *component,
        const struct snd_soc_component_driver *driver, struct device *dev)
{
        struct snd_soc_dapm_context *dapm;

        component->name = fmt_single_name(dev, &component->id);
        if (!component->name) {
                dev_err(dev, "ASoC: Failed to allocate name\n");
                return -ENOMEM;
        }

        component->dev = dev;
        component->driver = driver;
        component->probe = component->driver->probe;
        component->remove = component->driver->remove;
        component->suspend = component->driver->suspend;
        component->resume = component->driver->resume;

        dapm = &component->dapm;
        dapm->dev = dev;
        dapm->component = component;
        dapm->bias_level = SND_SOC_BIAS_OFF;
        dapm->idle_bias_off = true;
        if (driver->seq_notifier)
                dapm->seq_notifier = snd_soc_component_seq_notifier;
        if (driver->stream_event)
                dapm->stream_event = snd_soc_component_stream_event;

        component->controls = driver->controls;
        component->num_controls = driver->num_controls;
        component->dapm_widgets = driver->dapm_widgets;
        component->num_dapm_widgets = driver->num_dapm_widgets;
        component->dapm_routes = driver->dapm_routes;
        component->num_dapm_routes = driver->num_dapm_routes;

        INIT_LIST_HEAD(&component->dai_list);
        mutex_init(&component->io_mutex);

        return 0;
}

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

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

#ifdef CONFIG_REGMAP

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

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

#endif

static void snd_soc_component_add_unlocked(struct snd_soc_component *component)
{
        if (!component->write && !component->read) {
                if (!component->regmap)
                        component->regmap = dev_get_regmap(component->dev, NULL);
                if (component->regmap)
                        snd_soc_component_setup_regmap(component);
        }

        list_add(&component->list, &component_list);
        INIT_LIST_HEAD(&component->dobj_list);
}

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

        list_del(&component->list);
}

int snd_soc_register_component(struct device *dev,
                               const struct snd_soc_component_driver *cmpnt_drv,
                               struct snd_soc_dai_driver *dai_drv,
                               int num_dai)
{
        struct snd_soc_component *cmpnt;
        int ret;

        cmpnt = kzalloc(sizeof(*cmpnt), GFP_KERNEL);
        if (!cmpnt) {
                dev_err(dev, "ASoC: Failed to allocate memory\n");
                return -ENOMEM;
        }

        ret = snd_soc_component_initialize(cmpnt, cmpnt_drv, dev);
        if (ret)
                goto err_free;

        cmpnt->ignore_pmdown_time = true;
        cmpnt->registered_as_component = true;

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

        snd_soc_component_add(cmpnt);

        return 0;

err_cleanup:
        snd_soc_component_cleanup(cmpnt);
err_free:
        kfree(cmpnt);
        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_component);

/**
 * snd_soc_unregister_component - Unregister a component from the ASoC core
 *
 * @dev: The device to unregister
 */
void snd_soc_unregister_component(struct device *dev)
{
        struct snd_soc_component *cmpnt;

        mutex_lock(&client_mutex);
        list_for_each_entry(cmpnt, &component_list, list) {
                if (dev == cmpnt->dev && cmpnt->registered_as_component)
                        goto found;
        }
        mutex_unlock(&client_mutex);
        return;

found:
        snd_soc_tplg_component_remove(cmpnt, SND_SOC_TPLG_INDEX_ALL);
        snd_soc_component_del_unlocked(cmpnt);
        mutex_unlock(&client_mutex);
        snd_soc_component_cleanup(cmpnt);
        kfree(cmpnt);
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_component);

static int snd_soc_platform_drv_probe(struct snd_soc_component *component)
{
        struct snd_soc_platform *platform = snd_soc_component_to_platform(component);

        return platform->driver->probe(platform);
}

static void snd_soc_platform_drv_remove(struct snd_soc_component *component)
{
        struct snd_soc_platform *platform = snd_soc_component_to_platform(component);

        platform->driver->remove(platform);
}

/**
 * snd_soc_add_platform - Add a platform to the ASoC core
 * @dev: The parent device for the platform
 * @platform: The platform to add
 * @platform_drv: The driver for the platform
 */
int snd_soc_add_platform(struct device *dev, struct snd_soc_platform *platform,
                const struct snd_soc_platform_driver *platform_drv)
{
        int ret;

        ret = snd_soc_component_initialize(&platform->component,
                        &platform_drv->component_driver, dev);
        if (ret)
                return ret;

        platform->dev = dev;
        platform->driver = platform_drv;

        if (platform_drv->probe)
                platform->component.probe = snd_soc_platform_drv_probe;
        if (platform_drv->remove)
                platform->component.remove = snd_soc_platform_drv_remove;

#ifdef CONFIG_DEBUG_FS
        platform->component.debugfs_prefix = "platform";
#endif

        mutex_lock(&client_mutex);
        snd_soc_component_add_unlocked(&platform->component);
        list_add(&platform->list, &platform_list);
        mutex_unlock(&client_mutex);

        dev_dbg(dev, "ASoC: Registered platform '%s'\n",
                platform->component.name);

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_add_platform);

/**
 * snd_soc_register_platform - Register a platform with the ASoC core
 *
 * @dev: The device for the platform
 * @platform_drv: The driver for the platform
 */
int snd_soc_register_platform(struct device *dev,
                const struct snd_soc_platform_driver *platform_drv)
{
        struct snd_soc_platform *platform;
        int ret;

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

        platform = kzalloc(sizeof(struct snd_soc_platform), GFP_KERNEL);
        if (platform == NULL)
                return -ENOMEM;

        ret = snd_soc_add_platform(dev, platform, platform_drv);
        if (ret)
                kfree(platform);

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_platform);

/**
 * snd_soc_remove_platform - Remove a platform from the ASoC core
 * @platform: the platform to remove
 */
void snd_soc_remove_platform(struct snd_soc_platform *platform)
{

        mutex_lock(&client_mutex);
        list_del(&platform->list);
        snd_soc_component_del_unlocked(&platform->component);
        mutex_unlock(&client_mutex);

        dev_dbg(platform->dev, "ASoC: Unregistered platform '%s'\n",
                platform->component.name);

        snd_soc_component_cleanup(&platform->component);
}
EXPORT_SYMBOL_GPL(snd_soc_remove_platform);

struct snd_soc_platform *snd_soc_lookup_platform(struct device *dev)
{
        struct snd_soc_platform *platform;

        mutex_lock(&client_mutex);
        list_for_each_entry(platform, &platform_list, list) {
                if (dev == platform->dev) {
                        mutex_unlock(&client_mutex);
                        return platform;
                }
        }
        mutex_unlock(&client_mutex);

        return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_lookup_platform);

/**
 * snd_soc_unregister_platform - Unregister a platform from the ASoC core
 *
 * @dev: platform to unregister
 */
void snd_soc_unregister_platform(struct device *dev)
{
        struct snd_soc_platform *platform;

        platform = snd_soc_lookup_platform(dev);
        if (!platform)
                return;

        snd_soc_remove_platform(platform);
        kfree(platform);
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_platform);

static u64 codec_format_map[] = {
        SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE,
        SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE,
        SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE,
        SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_U24_BE,
        SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE,
        SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_U32_BE,
        SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_U24_3BE,
        SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_U24_3BE,
        SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE,
        SNDRV_PCM_FMTBIT_U20_3LE | SNDRV_PCM_FMTBIT_U20_3BE,
        SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S18_3BE,
        SNDRV_PCM_FMTBIT_U18_3LE | SNDRV_PCM_FMTBIT_U18_3BE,
        SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE,
        SNDRV_PCM_FMTBIT_FLOAT64_LE | SNDRV_PCM_FMTBIT_FLOAT64_BE,
        SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
        | SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE,
};

/* 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 fixup_codec_formats(struct snd_soc_pcm_stream *stream)
{
        int i;

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

static int snd_soc_codec_drv_probe(struct snd_soc_component *component)
{
        struct snd_soc_codec *codec = snd_soc_component_to_codec(component);

        return codec->driver->probe(codec);
}

static void snd_soc_codec_drv_remove(struct snd_soc_component *component)
{
        struct snd_soc_codec *codec = snd_soc_component_to_codec(component);

        codec->driver->remove(codec);
}

static int snd_soc_codec_drv_suspend(struct snd_soc_component *component)
{
        struct snd_soc_codec *codec = snd_soc_component_to_codec(component);

        return codec->driver->suspend(codec);
}

static int snd_soc_codec_drv_resume(struct snd_soc_component *component)
{
        struct snd_soc_codec *codec = snd_soc_component_to_codec(component);

        return codec->driver->resume(codec);
}

static int snd_soc_codec_drv_write(struct snd_soc_component *component,
        unsigned int reg, unsigned int val)
{
        struct snd_soc_codec *codec = snd_soc_component_to_codec(component);

        return codec->driver->write(codec, reg, val);
}

static int snd_soc_codec_drv_read(struct snd_soc_component *component,
        unsigned int reg, unsigned int *val)
{
        struct snd_soc_codec *codec = snd_soc_component_to_codec(component);

        *val = codec->driver->read(codec, reg);

        return 0;
}

static int snd_soc_codec_set_bias_level(struct snd_soc_dapm_context *dapm,
        enum snd_soc_bias_level level)
{
        struct snd_soc_codec *codec = snd_soc_dapm_to_codec(dapm);

        return codec->driver->set_bias_level(codec, level);
}

/**
 * snd_soc_register_codec - Register a codec with the ASoC core
 *
 * @dev: The parent device for this codec
 * @codec_drv: Codec driver
 * @dai_drv: The associated DAI driver
 * @num_dai: Number of DAIs
 */
int snd_soc_register_codec(struct device *dev,
                           const struct snd_soc_codec_driver *codec_drv,
                           struct snd_soc_dai_driver *dai_drv,
                           int num_dai)
{
        struct snd_soc_dapm_context *dapm;
        struct snd_soc_codec *codec;
        struct snd_soc_dai *dai;
        int ret, i;

        dev_dbg(dev, "codec register %s\n", dev_name(dev));

        codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
        if (codec == NULL)
                return -ENOMEM;

        codec->component.codec = codec;

        ret = snd_soc_component_initialize(&codec->component,
                        &codec_drv->component_driver, dev);
        if (ret)
                goto err_free;

        if (codec_drv->probe)
                codec->component.probe = snd_soc_codec_drv_probe;
        if (codec_drv->remove)
                codec->component.remove = snd_soc_codec_drv_remove;
        if (codec_drv->suspend)
                codec->component.suspend = snd_soc_codec_drv_suspend;
        if (codec_drv->resume)
                codec->component.resume = snd_soc_codec_drv_resume;
        if (codec_drv->write)
                codec->component.write = snd_soc_codec_drv_write;
        if (codec_drv->read)
                codec->component.read = snd_soc_codec_drv_read;
        codec->component.ignore_pmdown_time = codec_drv->ignore_pmdown_time;

        dapm = snd_soc_codec_get_dapm(codec);
        dapm->idle_bias_off = codec_drv->idle_bias_off;
        dapm->suspend_bias_off = codec_drv->suspend_bias_off;
        if (codec_drv->seq_notifier)
                dapm->seq_notifier = codec_drv->seq_notifier;
        if (codec_drv->set_bias_level)
                dapm->set_bias_level = snd_soc_codec_set_bias_level;
        codec->dev = dev;
        codec->driver = codec_drv;
        codec->component.val_bytes = codec_drv->reg_word_size;

#ifdef CONFIG_DEBUG_FS
        codec->component.init_debugfs = soc_init_codec_debugfs;
        codec->component.debugfs_prefix = "codec";
#endif

        if (codec_drv->get_regmap)
                codec->component.regmap = codec_drv->get_regmap(dev);

        for (i = 0; i < num_dai; i++) {
                fixup_codec_formats(&dai_drv[i].playback);
                fixup_codec_formats(&dai_drv[i].capture);
        }

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

        list_for_each_entry(dai, &codec->component.dai_list, list)
                dai->codec = codec;

        mutex_lock(&client_mutex);
        snd_soc_component_add_unlocked(&codec->component);
        list_add(&codec->list, &codec_list);
        mutex_unlock(&client_mutex);

        dev_dbg(codec->dev, "ASoC: Registered codec '%s'\n",
                codec->component.name);
        return 0;

err_cleanup:
        snd_soc_component_cleanup(&codec->component);
err_free:
        kfree(codec);
        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_codec);

/**
 * snd_soc_unregister_codec - Unregister a codec from the ASoC core
 *
 * @dev: codec to unregister
 */
void snd_soc_unregister_codec(struct device *dev)
{
        struct snd_soc_codec *codec;

        mutex_lock(&client_mutex);
        list_for_each_entry(codec, &codec_list, list) {
                if (dev == codec->dev)
                        goto found;
        }
        mutex_unlock(&client_mutex);
        return;

found:
        list_del(&codec->list);
        snd_soc_component_del_unlocked(&codec->component);
        mutex_unlock(&client_mutex);

        dev_dbg(codec->dev, "ASoC: Unregistered codec '%s'\n",
                        codec->component.name);

        snd_soc_component_cleanup(&codec->component);
        snd_soc_cache_exit(codec);
        kfree(codec);
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_codec);

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

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

        if (!np)
                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_from_node);

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_from_node(struct snd_soc_card *card,
                                          struct device_node *np,
                                          const char *propname)
{
        struct snd_soc_dapm_widget *widgets;
        const char *template, *wname;
        int i, j, num_widgets, ret;

        if (!np)
                np = card->dev->of_node;

        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_from_node);

static 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;
}

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_audio_prefix_from_node(struct snd_soc_card *card,
                                   struct device_node *np,
                                   struct snd_soc_codec_conf *codec_conf,
                                   struct device_node *of_node,
                                   const char *propname)
{
        const char *str;
        int ret;

        if (!np)
                np = card->dev->of_node;

        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_audio_prefix_from_node);

int snd_soc_of_parse_audio_routing_from_node(struct snd_soc_card *card,
                                   struct device_node *np,
                                   const char *propname)
{
        int num_routes;
        struct snd_soc_dapm_route *routes;
        int i, ret;

        if (!np)
                np = card->dev->of_node;

        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_kzalloc(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_from_node);

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 "[prefix]format = xxx"
         * SND_SOC_DAIFMT_FORMAT_MASK area
         */
        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_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);
        list_for_each_entry(pos, &component_list, list) {
                component_of_node = pos->dev->of_node;
                if (!component_of_node && pos->dev->parent)
                        component_of_node = pos->dev->parent->of_node;

                if (component_of_node != args->np)
                        continue;

                if (pos->driver->of_xlate_dai_name) {
                        ret = pos->driver->of_xlate_dai_name(pos,
                                                             args,
                                                             dai_name);
                } else {
                        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;

                        *dai_name = pos->dai_drv[id].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_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 the caller.
 *
 * 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_kzalloc(dev,
                                 sizeof *component * num_codecs,
                                 GFP_KERNEL);
        if (!component)
                return -ENOMEM;
        dai_link->codecs = component;
        dai_link->num_codecs = num_codecs;

        /* Parse the list */
        for (index = 0, component = dai_link->codecs;
             index < dai_link->num_codecs;
             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:
        for (index = 0, component = dai_link->codecs;
             index < dai_link->num_codecs;
             index++, component++) {
                if (!component->of_node)
                        break;
                of_node_put(component->of_node);
                component->of_node = NULL;
        }
        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();

#ifdef CONFIG_DEBUG_FS
#endif
        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");