soc-core.c

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/*
 * 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 <[email protected]>
 *         with code, comments and ideas from :-
 *         Richard Purdie <[email protected]>
 *
 *  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/ctype.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <sound/ac97_codec.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/initval.h>

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

#define NAME_SIZE   32

static DECLARE_WAIT_QUEUE_HEAD(soc_pm_waitq);

#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(dai_list);
static LIST_HEAD(platform_list);
static LIST_HEAD(codec_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;
    char tmpbuf[len + 1];
    char regbuf[regsize + 1];

    /* since tmpbuf is allocated on the stack, warn the callers if they
     * try to abuse this function */
    WARN_ON(len > 63);

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

    ret = snd_soc_read(codec, reg);
    if (ret < 0) {
        memset(regbuf, 'X', regsize);
        regbuf[regsize] = '\0';
    } else {
        snprintf(regbuf, regsize + 1, "%.*x", regsize, ret);
    }

    /* prepare the buffer */
    snprintf(tmpbuf, len + 1, "%.*x: %s\n", wordsize, reg, regbuf);
    /* copy it back to the caller without the '\0' */
    memcpy(buf, tmpbuf, len);

    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) {
        if (!snd_soc_codec_readable_register(codec, i))
            continue;
        if (codec->driver->display_register) {
            count += codec->driver->display_register(codec, buf + count,
                             PAGE_SIZE - count, i);
        } else {
            /* 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 = strict_strtol(buf, 10, &rtd->pmdown_time);
    if (ret)
        return ret;

    return count;
}

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

#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;

    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++;
    if (strict_strtoul(start, 16, &value))
        return -EINVAL;

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

    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_codec_debugfs(struct snd_soc_codec *codec)
{
    struct dentry *debugfs_card_root = codec->card->debugfs_card_root;

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

    debugfs_create_bool("cache_sync", 0444, codec->debugfs_codec_root,
                &codec->cache_sync);
    debugfs_create_bool("cache_only", 0444, codec->debugfs_codec_root,
                &codec->cache_only);

    codec->debugfs_reg = debugfs_create_file("codec_reg", 0644,
                         codec->debugfs_codec_root,
                         codec, &codec_reg_fops);
    if (!codec->debugfs_reg)
        dev_warn(codec->dev, "Failed to create codec register debugfs file\n");

    snd_soc_dapm_debugfs_init(&codec->dapm, codec->debugfs_codec_root);
}

static void soc_cleanup_codec_debugfs(struct snd_soc_codec *codec)
{
    debugfs_remove_recursive(codec->debugfs_codec_root);
}

static void soc_init_platform_debugfs(struct snd_soc_platform *platform)
{
    struct dentry *debugfs_card_root = platform->card->debugfs_card_root;

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

    snd_soc_dapm_debugfs_init(&platform->dapm,
        platform->debugfs_platform_root);
}

static void soc_cleanup_platform_debugfs(struct snd_soc_platform *platform)
{
    debugfs_remove_recursive(platform->debugfs_platform_root);
}

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;

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

    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_dai *dai;

    if (!buf)
        return -ENOMEM;

    list_for_each_entry(dai, &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;
        }
    }

    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;

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

    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)
{
    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,
               "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);
}

#else

static inline void soc_init_codec_debugfs(struct snd_soc_codec *codec)
{
}

static inline void soc_cleanup_codec_debugfs(struct snd_soc_codec *codec)
{
}

static inline void soc_init_platform_debugfs(struct snd_soc_platform *platform)
{
}

static inline void soc_cleanup_platform_debugfs(struct snd_soc_platform *platform)
{
}

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

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

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

    for (i = 0; i < card->num_links; i++) {
        if (card->rtd[i].dai_link->no_pcm &&
            !strcmp(card->rtd[i].dai_link->name, dai_link))
            return card->rtd[i].pcm->streams[stream].substream;
    }
    dev_dbg(card->dev, "failed to find dai link %s\n", dai_link);
    return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_get_dai_substream);

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

    for (i = 0; i < card->num_links; i++) {
        if (!strcmp(card->rtd[i].dai_link->name, dai_link))
            return &card->rtd[i];
    }
    dev_dbg(card->dev, "failed to find rtd %s\n", dai_link);
    return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_get_pcm_runtime);

#ifdef CONFIG_SND_SOC_AC97_BUS
/* unregister ac97 codec */
static int soc_ac97_dev_unregister(struct snd_soc_codec *codec)
{
    if (codec->ac97->dev.bus)
        device_unregister(&codec->ac97->dev);
    return 0;
}

/* stop no dev release warning */
static void soc_ac97_device_release(struct device *dev){}

/* register ac97 codec to bus */
static int soc_ac97_dev_register(struct snd_soc_codec *codec)
{
    int err;

    codec->ac97->dev.bus = &ac97_bus_type;
    codec->ac97->dev.parent = codec->card->dev;
    codec->ac97->dev.release = soc_ac97_device_release;

    dev_set_name(&codec->ac97->dev, "%d-%d:%s",
             codec->card->snd_card->number, 0, codec->name);
    err = device_register(&codec->ac97->dev);
    if (err < 0) {
        snd_printk(KERN_ERR "Can't register ac97 bus\n");
        codec->ac97->dev.bus = NULL;
        return err;
    }
    return 0;
}
#endif

#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_codec *codec;
    int i;

    /* If the initialization of this soc device failed, there is no codec
     * associated with it. Just bail out in this case.
     */
    if (list_empty(&card->codec_dev_list))
        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 */
    for (i = 0; i < card->num_rtd; i++) {
        struct snd_soc_dai *dai = card->rtd[i].codec_dai;
        struct snd_soc_dai_driver *drv = dai->driver;

        if (card->rtd[i].dai_link->ignore_suspend)
            continue;

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

    /* suspend all pcms */
    for (i = 0; i < card->num_rtd; i++) {
        if (card->rtd[i].dai_link->ignore_suspend)
            continue;

        snd_pcm_suspend_all(card->rtd[i].pcm);
    }

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

    for (i = 0; i < card->num_rtd; i++) {
        struct snd_soc_dai *cpu_dai = card->rtd[i].cpu_dai;
        struct snd_soc_platform *platform = card->rtd[i].platform;

        if (card->rtd[i].dai_link->ignore_suspend)
            continue;

        if (cpu_dai->driver->suspend && !cpu_dai->driver->ac97_control)
            cpu_dai->driver->suspend(cpu_dai);
        if (platform->driver->suspend && !platform->suspended) {
            platform->driver->suspend(cpu_dai);
            platform->suspended = 1;
        }
    }

    /* close any waiting streams and save state */
    for (i = 0; i < card->num_rtd; i++) {
        flush_delayed_work(&card->rtd[i].delayed_work);
        card->rtd[i].codec->dapm.suspend_bias_level = card->rtd[i].codec->dapm.bias_level;
    }

    for (i = 0; i < card->num_rtd; i++) {

        if (card->rtd[i].dai_link->ignore_suspend)
            continue;

        snd_soc_dapm_stream_event(&card->rtd[i],
                      SNDRV_PCM_STREAM_PLAYBACK,
                      SND_SOC_DAPM_STREAM_SUSPEND);

        snd_soc_dapm_stream_event(&card->rtd[i],
                      SNDRV_PCM_STREAM_CAPTURE,
                      SND_SOC_DAPM_STREAM_SUSPEND);
    }

    /* Recheck all analogue paths too */
    dapm_mark_io_dirty(&card->dapm);
    snd_soc_dapm_sync(&card->dapm);

    /* suspend all CODECs */
    list_for_each_entry(codec, &card->codec_dev_list, card_list) {
        /* If there are paths active then the CODEC will be held with
         * bias _ON and should not be suspended. */
        if (!codec->suspended && codec->driver->suspend) {
            switch (codec->dapm.bias_level) {
            case SND_SOC_BIAS_STANDBY:
                /*
                 * If the CODEC is capable of idle
                 * bias off then being in STANDBY
                 * means it's doing something,
                 * otherwise fall through.
                 */
                if (codec->dapm.idle_bias_off) {
                    dev_dbg(codec->dev,
                        "idle_bias_off CODEC on over suspend\n");
                    break;
                }
            case SND_SOC_BIAS_OFF:
                codec->driver->suspend(codec);
                codec->suspended = 1;
                codec->cache_sync = 1;
                if (codec->using_regmap)
                    regcache_mark_dirty(codec->control_data);
                break;
            default:
                dev_dbg(codec->dev, "CODEC is on over suspend\n");
                break;
            }
        }
    }

    for (i = 0; i < card->num_rtd; i++) {
        struct snd_soc_dai *cpu_dai = card->rtd[i].cpu_dai;

        if (card->rtd[i].dai_link->ignore_suspend)
            continue;

        if (cpu_dai->driver->suspend && cpu_dai->driver->ac97_control)
            cpu_dai->driver->suspend(cpu_dai);
    }

    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_codec *codec;
    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, "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 AC97 DAIs */
    for (i = 0; i < card->num_rtd; i++) {
        struct snd_soc_dai *cpu_dai = card->rtd[i].cpu_dai;

        if (card->rtd[i].dai_link->ignore_suspend)
            continue;

        if (cpu_dai->driver->resume && cpu_dai->driver->ac97_control)
            cpu_dai->driver->resume(cpu_dai);
    }

    list_for_each_entry(codec, &card->codec_dev_list, card_list) {
        /* If the CODEC was idle over suspend then it will have been
         * left with bias OFF or STANDBY and suspended so we must now
         * resume.  Otherwise the suspend was suppressed.
         */
        if (codec->driver->resume && codec->suspended) {
            switch (codec->dapm.bias_level) {
            case SND_SOC_BIAS_STANDBY:
            case SND_SOC_BIAS_OFF:
                codec->driver->resume(codec);
                codec->suspended = 0;
                break;
            default:
                dev_dbg(codec->dev, "CODEC was on over suspend\n");
                break;
            }
        }
    }

    for (i = 0; i < card->num_rtd; i++) {

        if (card->rtd[i].dai_link->ignore_suspend)
            continue;

        snd_soc_dapm_stream_event(&card->rtd[i],
                      SNDRV_PCM_STREAM_PLAYBACK,
                      SND_SOC_DAPM_STREAM_RESUME);

        snd_soc_dapm_stream_event(&card->rtd[i],
                      SNDRV_PCM_STREAM_CAPTURE,
                      SND_SOC_DAPM_STREAM_RESUME);
    }

    /* unmute any active DACs */
    for (i = 0; i < card->num_rtd; i++) {
        struct snd_soc_dai *dai = card->rtd[i].codec_dai;
        struct snd_soc_dai_driver *drv = dai->driver;

        if (card->rtd[i].dai_link->ignore_suspend)
            continue;

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

    for (i = 0; i < card->num_rtd; i++) {
        struct snd_soc_dai *cpu_dai = card->rtd[i].cpu_dai;
        struct snd_soc_platform *platform = card->rtd[i].platform;

        if (card->rtd[i].dai_link->ignore_suspend)
            continue;

        if (cpu_dai->driver->resume && !cpu_dai->driver->ac97_control)
            cpu_dai->driver->resume(cpu_dai);
        if (platform->driver->resume && platform->suspended) {
            platform->driver->resume(cpu_dai);
            platform->suspended = 0;
        }
    }

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

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

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

    /* Recheck all analogue paths too */
    dapm_mark_io_dirty(&card->dapm);
    snd_soc_dapm_sync(&card->dapm);
}

/* powers up audio subsystem after a suspend */
int snd_soc_resume(struct device *dev)
{
    struct snd_soc_card *card = dev_get_drvdata(dev);
    int i, ac97_control = 0;

    /* If the initialization of this soc device failed, there is no codec
     * associated with it. Just bail out in this case.
     */
    if (list_empty(&card->codec_dev_list))
        return 0;

    /* AC97 devices might have other drivers hanging off them so
     * need to resume immediately.  Other drivers don't have that
     * problem and may take a substantial amount of time to resume
     * due to I/O costs and anti-pop so handle them out of line.
     */
    for (i = 0; i < card->num_rtd; i++) {
        struct snd_soc_dai *cpu_dai = card->rtd[i].cpu_dai;
        ac97_control |= cpu_dai->driver->ac97_control;
    }
    if (ac97_control) {
        dev_dbg(dev, "Resuming AC97 immediately\n");
        soc_resume_deferred(&card->deferred_resume_work);
    } else {
        dev_dbg(dev, "Scheduling resume work\n");
        if (!schedule_work(&card->deferred_resume_work))
            dev_err(dev, "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 int soc_bind_dai_link(struct snd_soc_card *card, int num)
{
    struct snd_soc_dai_link *dai_link = &card->dai_link[num];
    struct snd_soc_pcm_runtime *rtd = &card->rtd[num];
    struct snd_soc_codec *codec;
    struct snd_soc_platform *platform;
    struct snd_soc_dai *codec_dai, *cpu_dai;
    const char *platform_name;

    dev_dbg(card->dev, "binding %s at idx %d\n", dai_link->name, num);

    /* Find CPU DAI from registered DAIs*/
    list_for_each_entry(cpu_dai, &dai_list, list) {
        if (dai_link->cpu_of_node &&
            (cpu_dai->dev->of_node != dai_link->cpu_of_node))
            continue;
        if (dai_link->cpu_name &&
            strcmp(dev_name(cpu_dai->dev), dai_link->cpu_name))
            continue;
        if (dai_link->cpu_dai_name &&
            strcmp(cpu_dai->name, dai_link->cpu_dai_name))
            continue;

        rtd->cpu_dai = cpu_dai;
    }

    if (!rtd->cpu_dai) {
        dev_err(card->dev, "CPU DAI %s not registered\n",
            dai_link->cpu_dai_name);
        return -EPROBE_DEFER;
    }

    /* Find CODEC from registered CODECs */
    list_for_each_entry(codec, &codec_list, list) {
        if (dai_link->codec_of_node) {
            if (codec->dev->of_node != dai_link->codec_of_node)
                continue;
        } else {
            if (strcmp(codec->name, dai_link->codec_name))
                continue;
        }

        rtd->codec = codec;

        /*
         * CODEC found, so find CODEC DAI from registered DAIs from
         * this CODEC
         */
        list_for_each_entry(codec_dai, &dai_list, list) {
            if (codec->dev == codec_dai->dev &&
                !strcmp(codec_dai->name,
                    dai_link->codec_dai_name)) {

                rtd->codec_dai = codec_dai;
            }
        }

        if (!rtd->codec_dai) {
            dev_err(card->dev, "CODEC DAI %s not registered\n",
                dai_link->codec_dai_name);
            return -EPROBE_DEFER;
        }
    }

    if (!rtd->codec) {
        dev_err(card->dev, "CODEC %s not registered\n",
            dai_link->codec_name);
        return -EPROBE_DEFER;
    }

    /* 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) {
        if (dai_link->platform_of_node) {
            if (platform->dev->of_node !=
                dai_link->platform_of_node)
                continue;
        } else {
            if (strcmp(platform->name, platform_name))
                continue;
        }

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

    card->num_rtd++;

    return 0;
}

static int soc_remove_platform(struct snd_soc_platform *platform)
{
    int ret;

    if (platform->driver->remove) {
        ret = platform->driver->remove(platform);
        if (ret < 0)
            pr_err("asoc: failed to remove %s: %d\n",
                platform->name, ret);
    }

    /* Make sure all DAPM widgets are freed */
    snd_soc_dapm_free(&platform->dapm);

    soc_cleanup_platform_debugfs(platform);
    platform->probed = 0;
    list_del(&platform->card_list);
    module_put(platform->dev->driver->owner);

    return 0;
}

static void soc_remove_codec(struct snd_soc_codec *codec)
{
    int err;

    if (codec->driver->remove) {
        err = codec->driver->remove(codec);
        if (err < 0)
            dev_err(codec->dev,
                "asoc: failed to remove %s: %d\n",
                codec->name, err);
    }

    /* Make sure all DAPM widgets are freed */
    snd_soc_dapm_free(&codec->dapm);

    soc_cleanup_codec_debugfs(codec);
    codec->probed = 0;
    list_del(&codec->card_list);
    module_put(codec->dev->driver->owner);
}

static void soc_remove_link_dais(struct snd_soc_card *card, int num, int order)
{
    struct snd_soc_pcm_runtime *rtd = &card->rtd[num];
    struct snd_soc_dai *codec_dai = rtd->codec_dai, *cpu_dai = rtd->cpu_dai;
    int err;

    /* unregister the rtd device */
    if (rtd->dev_registered) {
        device_remove_file(rtd->dev, &dev_attr_pmdown_time);
        device_remove_file(rtd->dev, &dev_attr_codec_reg);
        device_unregister(rtd->dev);
        rtd->dev_registered = 0;
    }

    /* remove the CODEC DAI */
    if (codec_dai && codec_dai->probed &&
            codec_dai->driver->remove_order == order) {
        if (codec_dai->driver->remove) {
            err = codec_dai->driver->remove(codec_dai);
            if (err < 0)
                pr_err("asoc: failed to remove %s: %d\n",
                            codec_dai->name, err);
        }
        codec_dai->probed = 0;
        list_del(&codec_dai->card_list);
    }

    /* remove the cpu_dai */
    if (cpu_dai && cpu_dai->probed &&
            cpu_dai->driver->remove_order == order) {
        if (cpu_dai->driver->remove) {
            err = cpu_dai->driver->remove(cpu_dai);
            if (err < 0)
                pr_err("asoc: failed to remove %s: %d\n",
                            cpu_dai->name, err);
        }
        cpu_dai->probed = 0;
        list_del(&cpu_dai->card_list);

        if (!cpu_dai->codec) {
            snd_soc_dapm_free(&cpu_dai->dapm);
            module_put(cpu_dai->dev->driver->owner);
        }
    }
}

static void soc_remove_link_components(struct snd_soc_card *card, int num,
                       int order)
{
    struct snd_soc_pcm_runtime *rtd = &card->rtd[num];
    struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
    struct snd_soc_dai *codec_dai = rtd->codec_dai;
    struct snd_soc_platform *platform = rtd->platform;
    struct snd_soc_codec *codec;

    /* remove the platform */
    if (platform && platform->probed &&
        platform->driver->remove_order == order) {
        soc_remove_platform(platform);
    }

    /* remove the CODEC-side CODEC */
    if (codec_dai) {
        codec = codec_dai->codec;
        if (codec && codec->probed &&
            codec->driver->remove_order == order)
            soc_remove_codec(codec);
    }

    /* remove any CPU-side CODEC */
    if (cpu_dai) {
        codec = cpu_dai->codec;
        if (codec && codec->probed &&
            codec->driver->remove_order == order)
            soc_remove_codec(codec);
    }
}

static void soc_remove_dai_links(struct snd_soc_card *card)
{
    int dai, order;

    for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
            order++) {
        for (dai = 0; dai < card->num_rtd; dai++)
            soc_remove_link_dais(card, dai, order);
    }

    for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
            order++) {
        for (dai = 0; dai < card->num_rtd; dai++)
            soc_remove_link_components(card, dai, order);
    }

    card->num_rtd = 0;
}

static void soc_set_name_prefix(struct snd_soc_card *card,
                struct snd_soc_codec *codec)
{
    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->dev_name && !strcmp(codec->name, map->dev_name)) {
            codec->name_prefix = map->name_prefix;
            break;
        }
    }
}

static int soc_probe_codec(struct snd_soc_card *card,
               struct snd_soc_codec *codec)
{
    int ret = 0;
    const struct snd_soc_codec_driver *driver = codec->driver;
    struct snd_soc_dai *dai;

    codec->card = card;
    codec->dapm.card = card;
    soc_set_name_prefix(card, codec);

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

    soc_init_codec_debugfs(codec);

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

    /* Create DAPM widgets for each DAI stream */
    list_for_each_entry(dai, &dai_list, list) {
        if (dai->dev != codec->dev)
            continue;

        snd_soc_dapm_new_dai_widgets(&codec->dapm, dai);
    }

    codec->dapm.idle_bias_off = driver->idle_bias_off;

    if (driver->probe) {
        ret = driver->probe(codec);
        if (ret < 0) {
            dev_err(codec->dev,
                "asoc: failed to probe CODEC %s: %d\n",
                codec->name, ret);
            goto err_probe;
        }
    }

    /* If the driver didn't set I/O up try regmap */
    if (!codec->write && dev_get_regmap(codec->dev, NULL))
        snd_soc_codec_set_cache_io(codec, 0, 0, SND_SOC_REGMAP);

    if (driver->controls)
        snd_soc_add_codec_controls(codec, driver->controls,
                     driver->num_controls);
    if (driver->dapm_routes)
        snd_soc_dapm_add_routes(&codec->dapm, driver->dapm_routes,
                    driver->num_dapm_routes);

    /* mark codec as probed and add to card codec list */
    codec->probed = 1;
    list_add(&codec->card_list, &card->codec_dev_list);
    list_add(&codec->dapm.list, &card->dapm_list);

    return 0;

err_probe:
    soc_cleanup_codec_debugfs(codec);
    module_put(codec->dev->driver->owner);

    return ret;
}

static int soc_probe_platform(struct snd_soc_card *card,
               struct snd_soc_platform *platform)
{
    int ret = 0;
    const struct snd_soc_platform_driver *driver = platform->driver;
    struct snd_soc_dai *dai;

    platform->card = card;
    platform->dapm.card = card;

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

    soc_init_platform_debugfs(platform);

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

    /* Create DAPM widgets for each DAI stream */
    list_for_each_entry(dai, &dai_list, list) {
        if (dai->dev != platform->dev)
            continue;

        snd_soc_dapm_new_dai_widgets(&platform->dapm, dai);
    }

    platform->dapm.idle_bias_off = 1;

    if (driver->probe) {
        ret = driver->probe(platform);
        if (ret < 0) {
            dev_err(platform->dev,
                "asoc: failed to probe platform %s: %d\n",
                platform->name, ret);
            goto err_probe;
        }
    }

    if (driver->controls)
        snd_soc_add_platform_controls(platform, driver->controls,
                     driver->num_controls);
    if (driver->dapm_routes)
        snd_soc_dapm_add_routes(&platform->dapm, driver->dapm_routes,
                    driver->num_dapm_routes);

    /* mark platform as probed and add to card platform list */
    platform->probed = 1;
    list_add(&platform->card_list, &card->platform_dev_list);
    list_add(&platform->dapm.list, &card->dapm_list);

    return 0;

err_probe:
    soc_cleanup_platform_debugfs(platform);
    module_put(platform->dev->driver->owner);

    return ret;
}

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

static int soc_post_component_init(struct snd_soc_card *card,
                   struct snd_soc_codec *codec,
                   int num, int dailess)
{
    struct snd_soc_dai_link *dai_link = NULL;
    struct snd_soc_aux_dev *aux_dev = NULL;
    struct snd_soc_pcm_runtime *rtd;
    const char *temp, *name;
    int ret = 0;

    if (!dailess) {
        dai_link = &card->dai_link[num];
        rtd = &card->rtd[num];
        name = dai_link->name;
    } else {
        aux_dev = &card->aux_dev[num];
        rtd = &card->rtd_aux[num];
        name = aux_dev->name;
    }
    rtd->card = card;

    /* Make sure all DAPM widgets are instantiated */
    snd_soc_dapm_new_widgets(&codec->dapm);

    /* machine controls, routes and widgets are not prefixed */
    temp = codec->name_prefix;
    codec->name_prefix = NULL;

    /* do machine specific initialization */
    if (!dailess && dai_link->init)
        ret = dai_link->init(rtd);
    else if (dailess && aux_dev->init)
        ret = aux_dev->init(&codec->dapm);
    if (ret < 0) {
        dev_err(card->dev, "asoc: failed to init %s: %d\n", name, ret);
        return ret;
    }
    codec->name_prefix = temp;

    /* register the rtd device */
    rtd->codec = codec;

    rtd->dev = kzalloc(sizeof(struct device), GFP_KERNEL);
    if (!rtd->dev)
        return -ENOMEM;
    device_initialize(rtd->dev);
    rtd->dev->parent = card->dev;
    rtd->dev->release = rtd_release;
    rtd->dev->init_name = 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) {
        dev_err(card->dev,
            "asoc: failed to register runtime device: %d\n", ret);
        return ret;
    }
    rtd->dev_registered = 1;

    /* add DAPM sysfs entries for this codec */
    ret = snd_soc_dapm_sys_add(rtd->dev);
    if (ret < 0)
        dev_err(codec->dev,
            "asoc: failed to add codec dapm sysfs entries: %d\n",
            ret);

    /* add codec sysfs entries */
    ret = device_create_file(rtd->dev, &dev_attr_codec_reg);
    if (ret < 0)
        dev_err(codec->dev,
            "asoc: failed to add codec sysfs files: %d\n", ret);

#ifdef CONFIG_DEBUG_FS
    /* add DPCM sysfs entries */
    if (!dailess && !dai_link->dynamic)
        goto out;

    ret = soc_dpcm_debugfs_add(rtd);
    if (ret < 0)
        dev_err(rtd->dev, "asoc: failed to add dpcm sysfs entries: %d\n", ret);

out:
#endif
    return 0;
}

static int soc_probe_link_components(struct snd_soc_card *card, int num,
                     int order)
{
    struct snd_soc_pcm_runtime *rtd = &card->rtd[num];
    struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
    struct snd_soc_dai *codec_dai = rtd->codec_dai;
    struct snd_soc_platform *platform = rtd->platform;
    int ret;

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

    /* probe the CODEC-side component */
    if (!codec_dai->codec->probed &&
        codec_dai->codec->driver->probe_order == order) {
        ret = soc_probe_codec(card, codec_dai->codec);
        if (ret < 0)
            return ret;
    }

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

    return 0;
}

static int soc_probe_link_dais(struct snd_soc_card *card, int num, int order)
{
    struct snd_soc_dai_link *dai_link = &card->dai_link[num];
    struct snd_soc_pcm_runtime *rtd = &card->rtd[num];
    struct snd_soc_codec *codec = rtd->codec;
    struct snd_soc_platform *platform = rtd->platform;
    struct snd_soc_dai *codec_dai = rtd->codec_dai;
    struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
    struct snd_soc_dapm_widget *play_w, *capture_w;
    int ret;

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

    /* config components */
    cpu_dai->platform = platform;
    codec_dai->card = card;
    cpu_dai->card = card;

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

    /* probe the cpu_dai */
    if (!cpu_dai->probed &&
            cpu_dai->driver->probe_order == order) {
        if (!cpu_dai->codec) {
            cpu_dai->dapm.card = card;
            if (!try_module_get(cpu_dai->dev->driver->owner))
                return -ENODEV;

            list_add(&cpu_dai->dapm.list, &card->dapm_list);
            snd_soc_dapm_new_dai_widgets(&cpu_dai->dapm, cpu_dai);
        }

        if (cpu_dai->driver->probe) {
            ret = cpu_dai->driver->probe(cpu_dai);
            if (ret < 0) {
                pr_err("asoc: failed to probe CPU DAI %s: %d\n",
                            cpu_dai->name, ret);
                module_put(cpu_dai->dev->driver->owner);
                return ret;
            }
        }
        cpu_dai->probed = 1;
        /* mark cpu_dai as probed and add to card dai list */
        list_add(&cpu_dai->card_list, &card->dai_dev_list);
    }

    /* probe the CODEC DAI */
    if (!codec_dai->probed && codec_dai->driver->probe_order == order) {
        if (codec_dai->driver->probe) {
            ret = codec_dai->driver->probe(codec_dai);
            if (ret < 0) {
                pr_err("asoc: failed to probe CODEC DAI %s: %d\n",
                            codec_dai->name, ret);
                return ret;
            }
        }

        /* mark codec_dai as probed and add to card dai list */
        codec_dai->probed = 1;
        list_add(&codec_dai->card_list, &card->dai_dev_list);
    }

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

    ret = soc_post_component_init(card, codec, num, 0);
    if (ret)
        return ret;

    ret = device_create_file(rtd->dev, &dev_attr_pmdown_time);
    if (ret < 0)
        pr_warn("asoc: failed to add pmdown_time sysfs:%d\n", ret);

    if (cpu_dai->driver->compress_dai) {
        /*create compress_device"*/
        ret = soc_new_compress(rtd, num);
        if (ret < 0) {
            pr_err("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, num);
            if (ret < 0) {
                pr_err("asoc: can't create pcm %s :%d\n",
                       dai_link->stream_name, ret);
                return ret;
            }
        } else {
            /* link the DAI widgets */
            play_w = codec_dai->playback_widget;
            capture_w = cpu_dai->capture_widget;
            if (play_w && capture_w) {
                ret = snd_soc_dapm_new_pcm(card, dai_link->params,
                           capture_w, play_w);
                if (ret != 0) {
                    dev_err(card->dev, "Can't link %s to %s: %d\n",
                        play_w->name, capture_w->name, ret);
                    return ret;
                }
            }

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

    /* add platform data for AC97 devices */
    if (rtd->codec_dai->driver->ac97_control)
        snd_ac97_dev_add_pdata(codec->ac97, rtd->cpu_dai->ac97_pdata);

    return 0;
}

#ifdef CONFIG_SND_SOC_AC97_BUS
static int soc_register_ac97_dai_link(struct snd_soc_pcm_runtime *rtd)
{
    int ret;

    /* Only instantiate AC97 if not already done by the adaptor
     * for the generic AC97 subsystem.
     */
    if (rtd->codec_dai->driver->ac97_control && !rtd->codec->ac97_registered) {
        /*
         * It is possible that the AC97 device is already registered to
         * the device subsystem. This happens when the device is created
         * via snd_ac97_mixer(). Currently only SoC codec that does so
         * is the generic AC97 glue but others migh emerge.
         *
         * In those cases we don't try to register the device again.
         */
        if (!rtd->codec->ac97_created)
            return 0;

        ret = soc_ac97_dev_register(rtd->codec);
        if (ret < 0) {
            pr_err("asoc: AC97 device register failed:%d\n", ret);
            return ret;
        }

        rtd->codec->ac97_registered = 1;
    }
    return 0;
}

static void soc_unregister_ac97_dai_link(struct snd_soc_codec *codec)
{
    if (codec->ac97_registered) {
        soc_ac97_dev_unregister(codec);
        codec->ac97_registered = 0;
    }
}
#endif

static int soc_check_aux_dev(struct snd_soc_card *card, int num)
{
    struct snd_soc_aux_dev *aux_dev = &card->aux_dev[num];
    struct snd_soc_codec *codec;

    /* find CODEC from registered CODECs*/
    list_for_each_entry(codec, &codec_list, list) {
        if (!strcmp(codec->name, aux_dev->codec_name))
            return 0;
    }

    dev_err(card->dev, "%s not registered\n", aux_dev->codec_name);

    return -EPROBE_DEFER;
}

static int soc_probe_aux_dev(struct snd_soc_card *card, int num)
{
    struct snd_soc_aux_dev *aux_dev = &card->aux_dev[num];
    struct snd_soc_codec *codec;
    int ret = -ENODEV;

    /* find CODEC from registered CODECs*/
    list_for_each_entry(codec, &codec_list, list) {
        if (!strcmp(codec->name, aux_dev->codec_name)) {
            if (codec->probed) {
                dev_err(codec->dev,
                    "asoc: codec already probed");
                ret = -EBUSY;
                goto out;
            }
            goto found;
        }
    }
    /* codec not found */
    dev_err(card->dev, "asoc: codec %s not found", aux_dev->codec_name);
    return -EPROBE_DEFER;

found:
    ret = soc_probe_codec(card, codec);
    if (ret < 0)
        return ret;

    ret = soc_post_component_init(card, codec, num, 1);

out:
    return ret;
}

static void soc_remove_aux_dev(struct snd_soc_card *card, int num)
{
    struct snd_soc_pcm_runtime *rtd = &card->rtd_aux[num];
    struct snd_soc_codec *codec = rtd->codec;

    /* unregister the rtd device */
    if (rtd->dev_registered) {
        device_remove_file(rtd->dev, &dev_attr_codec_reg);
        device_del(rtd->dev);
        rtd->dev_registered = 0;
    }

    if (codec && codec->probed)
        soc_remove_codec(codec);
}

static int snd_soc_init_codec_cache(struct snd_soc_codec *codec,
                    enum snd_soc_compress_type compress_type)
{
    int ret;

    if (codec->cache_init)
        return 0;

    /* override the compress_type if necessary */
    if (compress_type && codec->compress_type != compress_type)
        codec->compress_type = compress_type;
    ret = snd_soc_cache_init(codec);
    if (ret < 0) {
        dev_err(codec->dev, "Failed to set cache compression type: %d\n",
            ret);
        return ret;
    }
    codec->cache_init = 1;
    return 0;
}

static int snd_soc_instantiate_card(struct snd_soc_card *card)
{
    struct snd_soc_codec *codec;
    struct snd_soc_codec_conf *codec_conf;
    enum snd_soc_compress_type compress_type;
    struct snd_soc_dai_link *dai_link;
    int ret, i, order, dai_fmt;

    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, i);
        if (ret != 0)
            goto base_error;
    }

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

    /* initialize the register cache for each available codec */
    list_for_each_entry(codec, &codec_list, list) {
        if (codec->cache_init)
            continue;
        /* by default we don't override the compress_type */
        compress_type = 0;
        /* check to see if we need to override the compress_type */
        for (i = 0; i < card->num_configs; ++i) {
            codec_conf = &card->codec_conf[i];
            if (!strcmp(codec->name, codec_conf->dev_name)) {
                compress_type = codec_conf->compress_type;
                if (compress_type && compress_type
                    != codec->compress_type)
                    break;
            }
        }
        ret = snd_soc_init_codec_cache(codec, compress_type);
        if (ret < 0)
            goto base_error;
    }

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

    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);

    /* 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++) {
        for (i = 0; i < card->num_links; i++) {
            ret = soc_probe_link_components(card, i, order);
            if (ret < 0) {
                pr_err("asoc: failed to instantiate card %s: %d\n",
                       card->name, 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++) {
        for (i = 0; i < card->num_links; i++) {
            ret = soc_probe_link_dais(card, i, order);
            if (ret < 0) {
                pr_err("asoc: failed to instantiate card %s: %d\n",
                       card->name, ret);
                goto probe_dai_err;
            }
        }
    }

    for (i = 0; i < card->num_aux_devs; i++) {
        ret = soc_probe_aux_dev(card, i);
        if (ret < 0) {
            pr_err("asoc: failed to add auxiliary devices %s: %d\n",
                   card->name, ret);
            goto probe_aux_dev_err;
        }
    }

    snd_soc_dapm_link_dai_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);

    snd_soc_dapm_new_widgets(&card->dapm);

    for (i = 0; i < card->num_links; i++) {
        dai_link = &card->dai_link[i];
        dai_fmt = dai_link->dai_fmt;

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

        /* If this is a regular CPU link there will be a platform */
        if (dai_fmt &&
            (dai_link->platform_name || dai_link->platform_of_node)) {
            ret = snd_soc_dai_set_fmt(card->rtd[i].cpu_dai,
                          dai_fmt);
            if (ret != 0 && ret != -ENOTSUPP)
                dev_warn(card->rtd[i].cpu_dai->dev,
                     "Failed to set DAI format: %d\n",
                     ret);
        } else if (dai_fmt) {
            /* Flip the polarity for the "CPU" end */
            dai_fmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
            switch (dai_link->dai_fmt &
                SND_SOC_DAIFMT_MASTER_MASK) {
            case SND_SOC_DAIFMT_CBM_CFM:
                dai_fmt |= SND_SOC_DAIFMT_CBS_CFS;
                break;
            case SND_SOC_DAIFMT_CBM_CFS:
                dai_fmt |= SND_SOC_DAIFMT_CBS_CFM;
                break;
            case SND_SOC_DAIFMT_CBS_CFM:
                dai_fmt |= SND_SOC_DAIFMT_CBM_CFS;
                break;
            case SND_SOC_DAIFMT_CBS_CFS:
                dai_fmt |= SND_SOC_DAIFMT_CBM_CFM;
                break;
            }

            ret = snd_soc_dai_set_fmt(card->rtd[i].cpu_dai,
                          dai_fmt);
            if (ret != 0 && ret != -ENOTSUPP)
                dev_warn(card->rtd[i].cpu_dai->dev,
                     "Failed to set DAI format: %d\n",
                     ret);
        }
    }

    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, "%s late_probe() failed: %d\n",
                card->name, ret);
            goto probe_aux_dev_err;
        }
    }

    snd_soc_dapm_new_widgets(&card->dapm);

    if (card->fully_routed)
        list_for_each_entry(codec, &card->codec_dev_list, card_list)
            snd_soc_dapm_auto_nc_codec_pins(codec);

    ret = snd_card_register(card->snd_card);
    if (ret < 0) {
        pr_err("asoc: failed to register soundcard for %s: %d\n",
                            card->name, ret);
        goto probe_aux_dev_err;
    }

#ifdef CONFIG_SND_SOC_AC97_BUS
    /* register any AC97 codecs */
    for (i = 0; i < card->num_rtd; i++) {
        ret = soc_register_ac97_dai_link(&card->rtd[i]);
        if (ret < 0) {
            pr_err("asoc: failed to register AC97 %s: %d\n",
                            card->name, ret);
            while (--i >= 0)
                soc_unregister_ac97_dai_link(card->rtd[i].codec);
            goto probe_aux_dev_err;
        }
    }
#endif

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

    return 0;

probe_aux_dev_err:
    for (i = 0; i < card->num_aux_devs; i++)
        soc_remove_aux_dev(card, i);

probe_dai_err:
    soc_remove_dai_links(card);

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

    snd_card_free(card->snd_card);

base_error:
    mutex_unlock(&card->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)
{
    int i;

    /* make sure any delayed work runs */
    for (i = 0; i < card->num_rtd; i++) {
        struct snd_soc_pcm_runtime *rtd = &card->rtd[i];
        flush_delayed_work(&rtd->delayed_work);
    }

    /* remove auxiliary devices */
    for (i = 0; i < card->num_aux_devs; i++)
        soc_remove_aux_dev(card, i);

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

    soc_cleanup_card_debugfs(card);

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

    snd_soc_dapm_free(&card->dapm);

    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);
    int i;

    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. */
    for (i = 0; i < card->num_rtd; i++) {
        struct snd_soc_pcm_runtime *rtd = &card->rtd[i];
        flush_delayed_work(&rtd->delayed_work);
    }

    snd_soc_dapm_shutdown(card);

    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",
        .owner      = THIS_MODULE,
        .pm     = &snd_soc_pm_ops,
    },
    .probe      = soc_probe,
    .remove     = soc_remove,
};

int snd_soc_codec_volatile_register(struct snd_soc_codec *codec,
                    unsigned int reg)
{
    if (codec->volatile_register)
        return codec->volatile_register(codec, reg);
    else
        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_codec_volatile_register);

int snd_soc_codec_readable_register(struct snd_soc_codec *codec,
                    unsigned int reg)
{
    if (codec->readable_register)
        return codec->readable_register(codec, reg);
    else
        return 1;
}
EXPORT_SYMBOL_GPL(snd_soc_codec_readable_register);

int snd_soc_codec_writable_register(struct snd_soc_codec *codec,
                    unsigned int reg)
{
    if (codec->writable_register)
        return codec->writable_register(codec, reg);
    else
        return 1;
}
EXPORT_SYMBOL_GPL(snd_soc_codec_writable_register);

int snd_soc_platform_read(struct snd_soc_platform *platform,
                    unsigned int reg)
{
    unsigned int ret;

    if (!platform->driver->read) {
        dev_err(platform->dev, "platform has no read back\n");
        return -1;
    }

    ret = platform->driver->read(platform, reg);
    dev_dbg(platform->dev, "read %x => %x\n", reg, ret);
    trace_snd_soc_preg_read(platform, reg, ret);

    return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_platform_read);

int snd_soc_platform_write(struct snd_soc_platform *platform,
                     unsigned int reg, unsigned int val)
{
    if (!platform->driver->write) {
        dev_err(platform->dev, "platform has no write back\n");
        return -1;
    }

    dev_dbg(platform->dev, "write %x = %x\n", reg, val);
    trace_snd_soc_preg_write(platform, reg, val);
    return platform->driver->write(platform, reg, val);
}
EXPORT_SYMBOL_GPL(snd_soc_platform_write);

int snd_soc_new_ac97_codec(struct snd_soc_codec *codec,
    struct snd_ac97_bus_ops *ops, int num)
{
    mutex_lock(&codec->mutex);

    codec->ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL);
    if (codec->ac97 == NULL) {
        mutex_unlock(&codec->mutex);
        return -ENOMEM;
    }

    codec->ac97->bus = kzalloc(sizeof(struct snd_ac97_bus), GFP_KERNEL);
    if (codec->ac97->bus == NULL) {
        kfree(codec->ac97);
        codec->ac97 = NULL;
        mutex_unlock(&codec->mutex);
        return -ENOMEM;
    }

    codec->ac97->bus->ops = ops;
    codec->ac97->num = num;

    /*
     * Mark the AC97 device to be created by us. This way we ensure that the
     * device will be registered with the device subsystem later on.
     */
    codec->ac97_created = 1;

    mutex_unlock(&codec->mutex);
    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec);

void snd_soc_free_ac97_codec(struct snd_soc_codec *codec)
{
    mutex_lock(&codec->mutex);
#ifdef CONFIG_SND_SOC_AC97_BUS
    soc_unregister_ac97_dai_link(codec);
#endif
    kfree(codec->ac97->bus);
    kfree(codec->ac97);
    codec->ac97 = NULL;
    codec->ac97_created = 0;
    mutex_unlock(&codec->mutex);
}
EXPORT_SYMBOL_GPL(snd_soc_free_ac97_codec);

unsigned int snd_soc_read(struct snd_soc_codec *codec, unsigned int reg)
{
    unsigned int ret;

    ret = codec->read(codec, reg);
    dev_dbg(codec->dev, "read %x => %x\n", reg, ret);
    trace_snd_soc_reg_read(codec, reg, ret);

    return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_read);

unsigned int snd_soc_write(struct snd_soc_codec *codec,
               unsigned int reg, unsigned int val)
{
    dev_dbg(codec->dev, "write %x = %x\n", reg, val);
    trace_snd_soc_reg_write(codec, reg, val);
    return codec->write(codec, reg, val);
}
EXPORT_SYMBOL_GPL(snd_soc_write);

unsigned int snd_soc_bulk_write_raw(struct snd_soc_codec *codec,
                    unsigned int reg, const void *data, size_t len)
{
    return codec->bulk_write_raw(codec, reg, data, len);
}
EXPORT_SYMBOL_GPL(snd_soc_bulk_write_raw);

int snd_soc_update_bits(struct snd_soc_codec *codec, unsigned short reg,
                unsigned int mask, unsigned int value)
{
    bool change;
    unsigned int old, new;
    int ret;

    if (codec->using_regmap) {
        ret = regmap_update_bits_check(codec->control_data, reg,
                           mask, value, &change);
    } else {
        ret = snd_soc_read(codec, reg);
        if (ret < 0)
            return ret;

        old = ret;
        new = (old & ~mask) | (value & mask);
        change = old != new;
        if (change)
            ret = snd_soc_write(codec, reg, new);
    }

    if (ret < 0)
        return ret;

    return change;
}
EXPORT_SYMBOL_GPL(snd_soc_update_bits);

int snd_soc_update_bits_locked(struct snd_soc_codec *codec,
                   unsigned short reg, unsigned int mask,
                   unsigned int value)
{
    int change;

    mutex_lock(&codec->mutex);
    change = snd_soc_update_bits(codec, reg, mask, value);
    mutex_unlock(&codec->mutex);

    return change;
}
EXPORT_SYMBOL_GPL(snd_soc_update_bits_locked);

int snd_soc_test_bits(struct snd_soc_codec *codec, unsigned short reg,
                unsigned int mask, unsigned int value)
{
    int change;
    unsigned int old, new;

    old = snd_soc_read(codec, reg);
    new = (old & ~mask) | value;
    change = old != new;

    return change;
}
EXPORT_SYMBOL_GPL(snd_soc_test_bits);

int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
    const struct snd_pcm_hardware *hw)
{
    struct snd_pcm_runtime *runtime = substream->runtime;
    runtime->hw.info = hw->info;
    runtime->hw.formats = hw->formats;
    runtime->hw.period_bytes_min = hw->period_bytes_min;
    runtime->hw.period_bytes_max = hw->period_bytes_max;
    runtime->hw.periods_min = hw->periods_min;
    runtime->hw.periods_max = hw->periods_max;
    runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
    runtime->hw.fifo_size = hw->fifo_size;
    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);

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;
    int name_len;

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

    if (!long_name)
        long_name = template.name;

    if (prefix) {
        name_len = strlen(long_name) + strlen(prefix) + 2;
        name = kmalloc(name_len, GFP_KERNEL);
        if (!name)
            return NULL;

        snprintf(name, name_len, "%s %s", prefix, long_name);

        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, "Failed to add %s: %d\n", control->name, err);
            return err;
        }
    }

    return 0;
}

int snd_soc_add_codec_controls(struct snd_soc_codec *codec,
    const struct snd_kcontrol_new *controls, int num_controls)
{
    struct snd_card *card = codec->card->snd_card;

    return snd_soc_add_controls(card, codec->dev, controls, num_controls,
            codec->name_prefix, codec);
}
EXPORT_SYMBOL_GPL(snd_soc_add_codec_controls);

int snd_soc_add_platform_controls(struct snd_soc_platform *platform,
    const struct snd_kcontrol_new *controls, int num_controls)
{
    struct snd_card *card = platform->card->snd_card;

    return snd_soc_add_controls(card, platform->dev, controls, num_controls,
            NULL, platform);
}
EXPORT_SYMBOL_GPL(snd_soc_add_platform_controls);

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);

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->card->snd_card;

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

int snd_soc_info_enum_double(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_info *uinfo)
{
    struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;

    uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
    uinfo->count = e->shift_l == e->shift_r ? 1 : 2;
    uinfo->value.enumerated.items = e->max;

    if (uinfo->value.enumerated.item > e->max - 1)
        uinfo->value.enumerated.item = e->max - 1;
    strcpy(uinfo->value.enumerated.name,
        e->texts[uinfo->value.enumerated.item]);
    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_info_enum_double);

int snd_soc_get_enum_double(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
    unsigned int val;

    val = snd_soc_read(codec, e->reg);
    ucontrol->value.enumerated.item[0]
        = (val >> e->shift_l) & e->mask;
    if (e->shift_l != e->shift_r)
        ucontrol->value.enumerated.item[1] =
            (val >> e->shift_r) & e->mask;

    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_get_enum_double);

int snd_soc_put_enum_double(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
    unsigned int val;
    unsigned int mask;

    if (ucontrol->value.enumerated.item[0] > e->max - 1)
        return -EINVAL;
    val = ucontrol->value.enumerated.item[0] << e->shift_l;
    mask = e->mask << e->shift_l;
    if (e->shift_l != e->shift_r) {
        if (ucontrol->value.enumerated.item[1] > e->max - 1)
            return -EINVAL;
        val |= ucontrol->value.enumerated.item[1] << e->shift_r;
        mask |= e->mask << e->shift_r;
    }

    return snd_soc_update_bits_locked(codec, e->reg, mask, val);
}
EXPORT_SYMBOL_GPL(snd_soc_put_enum_double);

int snd_soc_get_value_enum_double(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
    unsigned int reg_val, val, mux;

    reg_val = snd_soc_read(codec, e->reg);
    val = (reg_val >> e->shift_l) & e->mask;
    for (mux = 0; mux < e->max; mux++) {
        if (val == e->values[mux])
            break;
    }
    ucontrol->value.enumerated.item[0] = mux;
    if (e->shift_l != e->shift_r) {
        val = (reg_val >> e->shift_r) & e->mask;
        for (mux = 0; mux < e->max; mux++) {
            if (val == e->values[mux])
                break;
        }
        ucontrol->value.enumerated.item[1] = mux;
    }

    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_get_value_enum_double);

int snd_soc_put_value_enum_double(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
    unsigned int val;
    unsigned int mask;

    if (ucontrol->value.enumerated.item[0] > e->max - 1)
        return -EINVAL;
    val = e->values[ucontrol->value.enumerated.item[0]] << e->shift_l;
    mask = e->mask << e->shift_l;
    if (e->shift_l != e->shift_r) {
        if (ucontrol->value.enumerated.item[1] > e->max - 1)
            return -EINVAL;
        val |= e->values[ucontrol->value.enumerated.item[1]] << e->shift_r;
        mask |= e->mask << e->shift_r;
    }

    return snd_soc_update_bits_locked(codec, e->reg, mask, val);
}
EXPORT_SYMBOL_GPL(snd_soc_put_value_enum_double);

int snd_soc_info_enum_ext(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_info *uinfo)
{
    struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;

    uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
    uinfo->count = 1;
    uinfo->value.enumerated.items = e->max;

    if (uinfo->value.enumerated.item > e->max - 1)
        uinfo->value.enumerated.item = e->max - 1;
    strcpy(uinfo->value.enumerated.name,
        e->texts[uinfo->value.enumerated.item]);
    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_info_enum_ext);

int snd_soc_info_volsw_ext(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_info *uinfo)
{
    int max = kcontrol->private_value;

    if (max == 1 && !strstr(kcontrol->id.name, " Volume"))
        uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
    else
        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;

    uinfo->count = 1;
    uinfo->value.integer.min = 0;
    uinfo->value.integer.max = max;
    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_info_volsw_ext);

int snd_soc_info_volsw(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_info *uinfo)
{
    struct soc_mixer_control *mc =
        (struct soc_mixer_control *)kcontrol->private_value;
    int platform_max;

    if (!mc->platform_max)
        mc->platform_max = mc->max;
    platform_max = mc->platform_max;

    if (platform_max == 1 && !strstr(kcontrol->id.name, " Volume"))
        uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
    else
        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;

    uinfo->count = snd_soc_volsw_is_stereo(mc) ? 2 : 1;
    uinfo->value.integer.min = 0;
    uinfo->value.integer.max = platform_max;
    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_info_volsw);

int snd_soc_get_volsw(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct soc_mixer_control *mc =
        (struct soc_mixer_control *)kcontrol->private_value;
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    unsigned int reg = mc->reg;
    unsigned int reg2 = mc->rreg;
    unsigned int shift = mc->shift;
    unsigned int rshift = mc->rshift;
    int max = mc->max;
    unsigned int mask = (1 << fls(max)) - 1;
    unsigned int invert = mc->invert;

    ucontrol->value.integer.value[0] =
        (snd_soc_read(codec, reg) >> shift) & mask;
    if (invert)
        ucontrol->value.integer.value[0] =
            max - ucontrol->value.integer.value[0];

    if (snd_soc_volsw_is_stereo(mc)) {
        if (reg == reg2)
            ucontrol->value.integer.value[1] =
                (snd_soc_read(codec, reg) >> rshift) & mask;
        else
            ucontrol->value.integer.value[1] =
                (snd_soc_read(codec, reg2) >> shift) & mask;
        if (invert)
            ucontrol->value.integer.value[1] =
                max - ucontrol->value.integer.value[1];
    }

    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_get_volsw);

int snd_soc_put_volsw(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct soc_mixer_control *mc =
        (struct soc_mixer_control *)kcontrol->private_value;
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    unsigned int reg = mc->reg;
    unsigned int reg2 = mc->rreg;
    unsigned int shift = mc->shift;
    unsigned int rshift = mc->rshift;
    int max = mc->max;
    unsigned int mask = (1 << fls(max)) - 1;
    unsigned int invert = mc->invert;
    int err;
    bool type_2r = 0;
    unsigned int val2 = 0;
    unsigned int val, val_mask;

    val = (ucontrol->value.integer.value[0] & mask);
    if (invert)
        val = max - val;
    val_mask = mask << shift;
    val = val << shift;
    if (snd_soc_volsw_is_stereo(mc)) {
        val2 = (ucontrol->value.integer.value[1] & mask);
        if (invert)
            val2 = max - val2;
        if (reg == reg2) {
            val_mask |= mask << rshift;
            val |= val2 << rshift;
        } else {
            val2 = val2 << shift;
            type_2r = 1;
        }
    }
    err = snd_soc_update_bits_locked(codec, reg, val_mask, val);
    if (err < 0)
        return err;

    if (type_2r)
        err = snd_soc_update_bits_locked(codec, reg2, val_mask, val2);

    return err;
}
EXPORT_SYMBOL_GPL(snd_soc_put_volsw);

int snd_soc_get_volsw_sx(struct snd_kcontrol *kcontrol,
              struct snd_ctl_elem_value *ucontrol)
{
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    struct soc_mixer_control *mc =
        (struct soc_mixer_control *)kcontrol->private_value;

    unsigned int reg = mc->reg;
    unsigned int reg2 = mc->rreg;
    unsigned int shift = mc->shift;
    unsigned int rshift = mc->rshift;
    int max = mc->max;
    int min = mc->min;
    int mask = (1 << (fls(min + max) - 1)) - 1;

    ucontrol->value.integer.value[0] =
        ((snd_soc_read(codec, reg) >> shift) - min) & mask;

    if (snd_soc_volsw_is_stereo(mc))
        ucontrol->value.integer.value[1] =
            ((snd_soc_read(codec, reg2) >> rshift) - min) & mask;

    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_get_volsw_sx);

int snd_soc_put_volsw_sx(struct snd_kcontrol *kcontrol,
             struct snd_ctl_elem_value *ucontrol)
{
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    struct soc_mixer_control *mc =
        (struct soc_mixer_control *)kcontrol->private_value;

    unsigned int reg = mc->reg;
    unsigned int reg2 = mc->rreg;
    unsigned int shift = mc->shift;
    unsigned int rshift = mc->rshift;
    int max = mc->max;
    int min = mc->min;
    int mask = (1 << (fls(min + max) - 1)) - 1;
    int err = 0;
    unsigned short val, val_mask, val2 = 0;

    val_mask = mask << shift;
    val = (ucontrol->value.integer.value[0] + min) & mask;
    val = val << shift;

    err = snd_soc_update_bits_locked(codec, reg, val_mask, val);
    if (err < 0)
        return err;

    if (snd_soc_volsw_is_stereo(mc)) {
        val_mask = mask << rshift;
        val2 = (ucontrol->value.integer.value[1] + min) & mask;
        val2 = val2 << rshift;

        if (snd_soc_update_bits_locked(codec, reg2, val_mask, val2))
            return err;
    }
    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_put_volsw_sx);

int snd_soc_info_volsw_s8(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_info *uinfo)
{
    struct soc_mixer_control *mc =
        (struct soc_mixer_control *)kcontrol->private_value;
    int platform_max;
    int min = mc->min;

    if (!mc->platform_max)
        mc->platform_max = mc->max;
    platform_max = mc->platform_max;

    uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
    uinfo->count = 2;
    uinfo->value.integer.min = 0;
    uinfo->value.integer.max = platform_max - min;
    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_info_volsw_s8);

int snd_soc_get_volsw_s8(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct soc_mixer_control *mc =
        (struct soc_mixer_control *)kcontrol->private_value;
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    unsigned int reg = mc->reg;
    int min = mc->min;
    int val = snd_soc_read(codec, reg);

    ucontrol->value.integer.value[0] =
        ((signed char)(val & 0xff))-min;
    ucontrol->value.integer.value[1] =
        ((signed char)((val >> 8) & 0xff))-min;
    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_get_volsw_s8);

int snd_soc_put_volsw_s8(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct soc_mixer_control *mc =
        (struct soc_mixer_control *)kcontrol->private_value;
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    unsigned int reg = mc->reg;
    int min = mc->min;
    unsigned int val;

    val = (ucontrol->value.integer.value[0]+min) & 0xff;
    val |= ((ucontrol->value.integer.value[1]+min) & 0xff) << 8;

    return snd_soc_update_bits_locked(codec, reg, 0xffff, val);
}
EXPORT_SYMBOL_GPL(snd_soc_put_volsw_s8);

int snd_soc_info_volsw_range(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_info *uinfo)
{
    struct soc_mixer_control *mc =
        (struct soc_mixer_control *)kcontrol->private_value;
    int platform_max;
    int min = mc->min;

    if (!mc->platform_max)
        mc->platform_max = mc->max;
    platform_max = mc->platform_max;

    uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
    uinfo->count = 1;
    uinfo->value.integer.min = 0;
    uinfo->value.integer.max = platform_max - min;

    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_info_volsw_range);

int snd_soc_put_volsw_range(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct soc_mixer_control *mc =
        (struct soc_mixer_control *)kcontrol->private_value;
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    unsigned int reg = mc->reg;
    unsigned int shift = mc->shift;
    int min = mc->min;
    int max = mc->max;
    unsigned int mask = (1 << fls(max)) - 1;
    unsigned int invert = mc->invert;
    unsigned int val, val_mask;

    val = ((ucontrol->value.integer.value[0] + min) & mask);
    if (invert)
        val = max - val;
    val_mask = mask << shift;
    val = val << shift;

    return snd_soc_update_bits_locked(codec, reg, val_mask, val);
}
EXPORT_SYMBOL_GPL(snd_soc_put_volsw_range);

int snd_soc_get_volsw_range(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct soc_mixer_control *mc =
        (struct soc_mixer_control *)kcontrol->private_value;
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    unsigned int reg = mc->reg;
    unsigned int shift = mc->shift;
    int min = mc->min;
    int max = mc->max;
    unsigned int mask = (1 << fls(max)) - 1;
    unsigned int invert = mc->invert;

    ucontrol->value.integer.value[0] =
        (snd_soc_read(codec, reg) >> shift) & mask;
    if (invert)
        ucontrol->value.integer.value[0] =
            max - ucontrol->value.integer.value[0];
    ucontrol->value.integer.value[0] =
        ucontrol->value.integer.value[0] - min;

    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_get_volsw_range);

int snd_soc_limit_volume(struct snd_soc_codec *codec,
    const char *name, int max)
{
    struct snd_card *card = codec->card->snd_card;
    struct snd_kcontrol *kctl;
    struct soc_mixer_control *mc;
    int found = 0;
    int ret = -EINVAL;

    /* Sanity check for name and max */
    if (unlikely(!name || max <= 0))
        return -EINVAL;

    list_for_each_entry(kctl, &card->controls, list) {
        if (!strncmp(kctl->id.name, name, sizeof(kctl->id.name))) {
            found = 1;
            break;
        }
    }
    if (found) {
        mc = (struct soc_mixer_control *)kctl->private_value;
        if (max <= mc->max) {
            mc->platform_max = max;
            ret = 0;
        }
    }
    return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_limit_volume);

int snd_soc_bytes_info(struct snd_kcontrol *kcontrol,
               struct snd_ctl_elem_info *uinfo)
{
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    struct soc_bytes *params = (void *)kcontrol->private_value;

    uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
    uinfo->count = params->num_regs * codec->val_bytes;

    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_bytes_info);

int snd_soc_bytes_get(struct snd_kcontrol *kcontrol,
              struct snd_ctl_elem_value *ucontrol)
{
    struct soc_bytes *params = (void *)kcontrol->private_value;
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    int ret;

    if (codec->using_regmap)
        ret = regmap_raw_read(codec->control_data, params->base,
                      ucontrol->value.bytes.data,
                      params->num_regs * codec->val_bytes);
    else
        ret = -EINVAL;

    /* Hide any masked bytes to ensure consistent data reporting */
    if (ret == 0 && params->mask) {
        switch (codec->val_bytes) {
        case 1:
            ucontrol->value.bytes.data[0] &= ~params->mask;
            break;
        case 2:
            ((u16 *)(&ucontrol->value.bytes.data))[0]
                &= ~params->mask;
            break;
        case 4:
            ((u32 *)(&ucontrol->value.bytes.data))[0]
                &= ~params->mask;
            break;
        default:
            return -EINVAL;
        }
    }

    return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_bytes_get);

int snd_soc_bytes_put(struct snd_kcontrol *kcontrol,
              struct snd_ctl_elem_value *ucontrol)
{
    struct soc_bytes *params = (void *)kcontrol->private_value;
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    int ret, len;
    unsigned int val;
    void *data;

    if (!codec->using_regmap)
        return -EINVAL;

    data = ucontrol->value.bytes.data;
    len = params->num_regs * codec->val_bytes;

    /*
     * If we've got a mask then we need to preserve the register
     * bits.  We shouldn't modify the incoming data so take a
     * copy.
     */
    if (params->mask) {
        ret = regmap_read(codec->control_data, params->base, &val);
        if (ret != 0)
            return ret;

        val &= params->mask;

        data = kmemdup(data, len, GFP_KERNEL);
        if (!data)
            return -ENOMEM;

        switch (codec->val_bytes) {
        case 1:
            ((u8 *)data)[0] &= ~params->mask;
            ((u8 *)data)[0] |= val;
            break;
        case 2:
            ((u16 *)data)[0] &= cpu_to_be16(~params->mask);
            ((u16 *)data)[0] |= cpu_to_be16(val);
            break;
        case 4:
            ((u32 *)data)[0] &= cpu_to_be32(~params->mask);
            ((u32 *)data)[0] |= cpu_to_be32(val);
            break;
        default:
            return -EINVAL;
        }
    }

    ret = regmap_raw_write(codec->control_data, params->base,
                   data, len);

    if (params->mask)
        kfree(data);

    return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_bytes_put);

int snd_soc_info_xr_sx(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_info *uinfo)
{
    struct soc_mreg_control *mc =
        (struct soc_mreg_control *)kcontrol->private_value;
    uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
    uinfo->count = 1;
    uinfo->value.integer.min = mc->min;
    uinfo->value.integer.max = mc->max;

    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_info_xr_sx);

int snd_soc_get_xr_sx(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct soc_mreg_control *mc =
        (struct soc_mreg_control *)kcontrol->private_value;
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    unsigned int regbase = mc->regbase;
    unsigned int regcount = mc->regcount;
    unsigned int regwshift = codec->driver->reg_word_size * BITS_PER_BYTE;
    unsigned int regwmask = (1<<regwshift)-1;
    unsigned int invert = mc->invert;
    unsigned long mask = (1UL<<mc->nbits)-1;
    long min = mc->min;
    long max = mc->max;
    long val = 0;
    unsigned long regval;
    unsigned int i;

    for (i = 0; i < regcount; i++) {
        regval = snd_soc_read(codec, regbase+i) & regwmask;
        val |= regval << (regwshift*(regcount-i-1));
    }
    val &= mask;
    if (min < 0 && val > max)
        val |= ~mask;
    if (invert)
        val = max - val;
    ucontrol->value.integer.value[0] = val;

    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_get_xr_sx);

int snd_soc_put_xr_sx(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct soc_mreg_control *mc =
        (struct soc_mreg_control *)kcontrol->private_value;
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    unsigned int regbase = mc->regbase;
    unsigned int regcount = mc->regcount;
    unsigned int regwshift = codec->driver->reg_word_size * BITS_PER_BYTE;
    unsigned int regwmask = (1<<regwshift)-1;
    unsigned int invert = mc->invert;
    unsigned long mask = (1UL<<mc->nbits)-1;
    long max = mc->max;
    long val = ucontrol->value.integer.value[0];
    unsigned int i, regval, regmask;
    int err;

    if (invert)
        val = max - val;
    val &= mask;
    for (i = 0; i < regcount; i++) {
        regval = (val >> (regwshift*(regcount-i-1))) & regwmask;
        regmask = (mask >> (regwshift*(regcount-i-1))) & regwmask;
        err = snd_soc_update_bits_locked(codec, regbase+i,
                regmask, regval);
        if (err < 0)
            return err;
    }

    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_put_xr_sx);

int snd_soc_get_strobe(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct soc_mixer_control *mc =
        (struct soc_mixer_control *)kcontrol->private_value;
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    unsigned int reg = mc->reg;
    unsigned int shift = mc->shift;
    unsigned int mask = 1 << shift;
    unsigned int invert = mc->invert != 0;
    unsigned int val = snd_soc_read(codec, reg) & mask;

    if (shift != 0 && val != 0)
        val = val >> shift;
    ucontrol->value.enumerated.item[0] = val ^ invert;

    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_get_strobe);

int snd_soc_put_strobe(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_value *ucontrol)
{
    struct soc_mixer_control *mc =
        (struct soc_mixer_control *)kcontrol->private_value;
    struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
    unsigned int reg = mc->reg;
    unsigned int shift = mc->shift;
    unsigned int mask = 1 << shift;
    unsigned int invert = mc->invert != 0;
    unsigned int strobe = ucontrol->value.enumerated.item[0] != 0;
    unsigned int val1 = (strobe ^ invert) ? mask : 0;
    unsigned int val2 = (strobe ^ invert) ? 0 : mask;
    int err;

    err = snd_soc_update_bits_locked(codec, reg, mask, val1);
    if (err < 0)
        return err;

    err = snd_soc_update_bits_locked(codec, reg, mask, val2);
    return err;
}
EXPORT_SYMBOL_GPL(snd_soc_put_strobe);

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 -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_sysclk);

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 -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_codec_set_sysclk);

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);

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);

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);

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

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);

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);

int snd_soc_dai_digital_mute(struct snd_soc_dai *dai, int mute)
{
    if (dai->driver && dai->driver->ops->digital_mute)
        return dai->driver->ops->digital_mute(dai, mute);
    else
        return -ENOTSUPP;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_digital_mute);

int snd_soc_register_card(struct snd_soc_card *card)
{
    int i, ret;

    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];

        /*
         * Codec must be specified by 1 of name or OF node,
         * not both or neither.
         */
        if (!!link->codec_name == !!link->codec_of_node) {
            dev_err(card->dev,
                "Neither/both codec name/of_node are set for %s\n",
                link->name);
            return -EINVAL;
        }
        /* Codec DAI name must be specified */
        if (!link->codec_dai_name) {
            dev_err(card->dev, "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,
                "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,
                "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,
                "Neither cpu_dai_name nor cpu_name/of_node are set for %s\n",
                link->name);
            return -EINVAL;
        }
    }

    dev_set_drvdata(card->dev, card);

    snd_soc_initialize_card_lists(card);

    soc_init_card_debugfs(card);

    card->rtd = devm_kzalloc(card->dev,
                 sizeof(struct snd_soc_pcm_runtime) *
                 (card->num_links + card->num_aux_devs),
                 GFP_KERNEL);
    if (card->rtd == NULL)
        return -ENOMEM;
    card->num_rtd = 0;
    card->rtd_aux = &card->rtd[card->num_links];

    for (i = 0; i < card->num_links; i++)
        card->rtd[i].dai_link = &card->dai_link[i];

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

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

    return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_card);

int snd_soc_unregister_card(struct snd_soc_card *card)
{
    if (card->instantiated)
        soc_cleanup_card_resources(card);
    dev_dbg(card->dev, "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) {
        pr_err("asoc: error - multiple DAI %s registered with no name\n",
                dev_name(dev));
        return NULL;
    }

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

int snd_soc_register_dai(struct device *dev,
        struct snd_soc_dai_driver *dai_drv)
{
    struct snd_soc_codec *codec;
    struct snd_soc_dai *dai;

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

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

    /* create DAI component name */
    dai->name = fmt_single_name(dev, &dai->id);
    if (dai->name == NULL) {
        kfree(dai);
        return -ENOMEM;
    }

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

    mutex_lock(&client_mutex);

    list_for_each_entry(codec, &codec_list, list) {
        if (codec->dev == dev) {
            dev_dbg(dev, "Mapped DAI %s to CODEC %s\n",
                dai->name, codec->name);
            dai->codec = codec;
            break;
        }
    }

    if (!dai->codec)
        dai->dapm.idle_bias_off = 1;

    list_add(&dai->list, &dai_list);

    mutex_unlock(&client_mutex);

    pr_debug("Registered DAI '%s'\n", dai->name);

    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_register_dai);

void snd_soc_unregister_dai(struct device *dev)
{
    struct snd_soc_dai *dai;

    list_for_each_entry(dai, &dai_list, list) {
        if (dev == dai->dev)
            goto found;
    }
    return;

found:
    mutex_lock(&client_mutex);
    list_del(&dai->list);
    mutex_unlock(&client_mutex);

    pr_debug("Unregistered DAI '%s'\n", dai->name);
    kfree(dai->name);
    kfree(dai);
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_dai);

int snd_soc_register_dais(struct device *dev,
        struct snd_soc_dai_driver *dai_drv, size_t count)
{
    struct snd_soc_codec *codec;
    struct snd_soc_dai *dai;
    int i, ret = 0;

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

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

        dai = kzalloc(sizeof(struct snd_soc_dai), GFP_KERNEL);
        if (dai == NULL) {
            ret = -ENOMEM;
            goto err;
        }

        /* create DAI component name */
        dai->name = fmt_multiple_name(dev, &dai_drv[i]);
        if (dai->name == NULL) {
            kfree(dai);
            ret = -EINVAL;
            goto err;
        }

        dai->dev = dev;
        dai->driver = &dai_drv[i];
        if (dai->driver->id)
            dai->id = dai->driver->id;
        else
            dai->id = i;
        dai->dapm.dev = dev;
        if (!dai->driver->ops)
            dai->driver->ops = &null_dai_ops;

        mutex_lock(&client_mutex);

        list_for_each_entry(codec, &codec_list, list) {
            if (codec->dev == dev) {
                dev_dbg(dev, "Mapped DAI %s to CODEC %s\n",
                    dai->name, codec->name);
                dai->codec = codec;
                break;
            }
        }

        if (!dai->codec)
            dai->dapm.idle_bias_off = 1;

        list_add(&dai->list, &dai_list);

        mutex_unlock(&client_mutex);

        pr_debug("Registered DAI '%s'\n", dai->name);
    }

    return 0;

err:
    for (i--; i >= 0; i--)
        snd_soc_unregister_dai(dev);

    return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_dais);

void snd_soc_unregister_dais(struct device *dev, size_t count)
{
    int i;

    for (i = 0; i < count; i++)
        snd_soc_unregister_dai(dev);
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_dais);

int snd_soc_register_platform(struct device *dev,
        struct snd_soc_platform_driver *platform_drv)
{
    struct snd_soc_platform *platform;

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

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

    /* create platform component name */
    platform->name = fmt_single_name(dev, &platform->id);
    if (platform->name == NULL) {
        kfree(platform);
        return -ENOMEM;
    }

    platform->dev = dev;
    platform->driver = platform_drv;
    platform->dapm.dev = dev;
    platform->dapm.platform = platform;
    platform->dapm.stream_event = platform_drv->stream_event;
    mutex_init(&platform->mutex);

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

    pr_debug("Registered platform '%s'\n", platform->name);

    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_register_platform);

void snd_soc_unregister_platform(struct device *dev)
{
    struct snd_soc_platform *platform;

    list_for_each_entry(platform, &platform_list, list) {
        if (dev == platform->dev)
            goto found;
    }
    return;

found:
    mutex_lock(&client_mutex);
    list_del(&platform->list);
    mutex_unlock(&client_mutex);

    pr_debug("Unregistered platform '%s'\n", platform->name);
    kfree(platform->name);
    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];
}

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)
{
    size_t reg_size;
    struct snd_soc_codec *codec;
    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;

    /* create CODEC component name */
    codec->name = fmt_single_name(dev, &codec->id);
    if (codec->name == NULL) {
        kfree(codec);
        return -ENOMEM;
    }

    if (codec_drv->compress_type)
        codec->compress_type = codec_drv->compress_type;
    else
        codec->compress_type = SND_SOC_FLAT_COMPRESSION;

    codec->write = codec_drv->write;
    codec->read = codec_drv->read;
    codec->volatile_register = codec_drv->volatile_register;
    codec->readable_register = codec_drv->readable_register;
    codec->writable_register = codec_drv->writable_register;
    codec->ignore_pmdown_time = codec_drv->ignore_pmdown_time;
    codec->dapm.bias_level = SND_SOC_BIAS_OFF;
    codec->dapm.dev = dev;
    codec->dapm.codec = codec;
    codec->dapm.seq_notifier = codec_drv->seq_notifier;
    codec->dapm.stream_event = codec_drv->stream_event;
    codec->dev = dev;
    codec->driver = codec_drv;
    codec->num_dai = num_dai;
    mutex_init(&codec->mutex);

    /* allocate CODEC register cache */
    if (codec_drv->reg_cache_size && codec_drv->reg_word_size) {
        reg_size = codec_drv->reg_cache_size * codec_drv->reg_word_size;
        codec->reg_size = reg_size;
        /* it is necessary to make a copy of the default register cache
         * because in the case of using a compression type that requires
         * the default register cache to be marked as __devinitconst the
         * kernel might have freed the array by the time we initialize
         * the cache.
         */
        if (codec_drv->reg_cache_default) {
            codec->reg_def_copy = kmemdup(codec_drv->reg_cache_default,
                              reg_size, GFP_KERNEL);
            if (!codec->reg_def_copy) {
                ret = -ENOMEM;
                goto fail;
            }
        }
    }

    if (codec_drv->reg_access_size && codec_drv->reg_access_default) {
        if (!codec->volatile_register)
            codec->volatile_register = snd_soc_default_volatile_register;
        if (!codec->readable_register)
            codec->readable_register = snd_soc_default_readable_register;
        if (!codec->writable_register)
            codec->writable_register = snd_soc_default_writable_register;
    }

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

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

    /* register any DAIs */
    if (num_dai) {
        ret = snd_soc_register_dais(dev, dai_drv, num_dai);
        if (ret < 0)
            dev_err(codec->dev, "Failed to regster DAIs: %d\n",
                ret);
    }

    pr_debug("Registered codec '%s'\n", codec->name);
    return 0;

fail:
    kfree(codec->name);
    kfree(codec);
    return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_codec);

void snd_soc_unregister_codec(struct device *dev)
{
    struct snd_soc_codec *codec;
    int i;

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

found:
    if (codec->num_dai)
        for (i = 0; i < codec->num_dai; i++)
            snd_soc_unregister_dai(dev);

    mutex_lock(&client_mutex);
    list_del(&codec->list);
    mutex_unlock(&client_mutex);

    pr_debug("Unregistered codec '%s'\n", codec->name);

    snd_soc_cache_exit(codec);
    kfree(codec->reg_def_copy);
    kfree(codec->name);
    kfree(codec);
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_codec);

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

    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,
            "Property '%s' could not be read: %d\n",
            propname, ret);
        return ret;
    }

    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_card_name);

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

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

    card->num_dapm_routes = num_routes;
    card->dapm_routes = routes;

    return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_routing);

static int __init snd_soc_init(void)
{
#ifdef CONFIG_DEBUG_FS
    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;
    }

    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");
#endif

    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();

#ifdef CONFIG_DEBUG_FS
    debugfs_remove_recursive(snd_soc_debugfs_root);
#endif
    platform_driver_unregister(&soc_driver);
}
module_exit(snd_soc_exit);

/* Module information */
MODULE_AUTHOR("Liam Girdwood, [email protected]");
MODULE_DESCRIPTION("ALSA SoC Core");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:soc-audio");