Merge remote-tracking branch 'asoc/topic/ac97' into asoc-fsl

[deliverable/linux.git] / sound / soc / soc-core.c

/*
 * soc-core.c  --  ALSA SoC Audio Layer
 *
 * Copyright 2005 Wolfson Microelectronics PLC.
 * Copyright 2005 Openedhand Ltd.
 * Copyright (C) 2010 Slimlogic Ltd.
 * Copyright (C) 2010 Texas Instruments Inc.
 *
 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
 *         with code, comments and ideas from :-
 *         Richard Purdie <richard@openedhand.com>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 *  TODO:
 *   o Add hw rules to enforce rates, etc.
 *   o More testing with other codecs/machines.
 *   o Add more codecs and platforms to ensure good API coverage.
 *   o Support TDM on PCM and I2S
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/bitops.h>
#include <linux/debugfs.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/gpio.h>
#include <linux/of_gpio.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);
static LIST_HEAD(component_list);

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

struct snd_ac97_reset_cfg {
        struct pinctrl *pctl;
        struct pinctrl_state *pstate_reset;
        struct pinctrl_state *pstate_warm_reset;
        struct pinctrl_state *pstate_run;
        int gpio_sdata;
        int gpio_sync;
        int gpio_reset;
};

/* 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, LOCKDEP_NOW_UNRELIABLE);

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

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

static void soc_init_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,
                        "ASoC: 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,
                        "ASoC: 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,
                        "ASoC: 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,
                       "ASoC: Failed to create pop time debugfs file\n");
}

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

#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, "ASoC: 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, "ASoC: 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) {
                dev_err(codec->dev, "ASoC: 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,
                                                "ASoC: 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,
                                        "ASoC: 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, "ASoC: starting resume work\n");

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

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

        /* resume 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,
                                        "ASoC: 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, "ASoC: 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, "ASoC: Resuming AC97 immediately\n");
                soc_resume_deferred(&card->deferred_resume_work);
        } else {
                dev_dbg(dev, "ASoC: Scheduling resume work\n");
                if (!schedule_work(&card->deferred_resume_work))
                        dev_err(dev, "ASoC: resume work item may be lost\n");
        }

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

static const struct snd_soc_dai_ops null_dai_ops = {
};

static 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, "ASoC: 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, "ASoC: 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, "ASoC: CODEC DAI %s not registered\n",
                                dai_link->codec_dai_name);
                        return -EPROBE_DEFER;
                }
        }

        if (!rtd->codec) {
                dev_err(card->dev, "ASoC: 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, "ASoC: 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)
                        dev_err(platform->dev, "ASoC: failed to remove %d\n",
                                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 %d\n", 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)
                                dev_err(codec_dai->dev,
                                        "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)
                                dev_err(cpu_dai->dev,
                                        "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 %d\n", ret);
                        goto err_probe;
                }
                WARN(codec->dapm.idle_bias_off &&
                        codec->dapm.bias_level != SND_SOC_BIAS_OFF,
                        "codec %s can not start from non-off bias with idle_bias_off==1\n",
                        codec->name);
        }

        /* 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 %d\n", 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) {
                /* calling put_device() here to free the rtd->dev */
                put_device(rtd->dev);
                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, "ASoC: 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) {
                                dev_err(cpu_dai->dev,
                                        "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) {
                                dev_err(codec_dai->dev,
                                        "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)
                dev_warn(rtd->dev, "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) {
                        dev_err(card->dev, "ASoC: can't create compress %s\n",
                                         dai_link->stream_name);
                        return ret;
                }
        } else {

                if (!dai_link->params) {
                        /* create the pcm */
                        ret = soc_new_pcm(rtd, num);
                        if (ret < 0) {
                                dev_err(card->dev, "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, "ASoC: 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, "ASoC: 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) {
                        dev_err(rtd->codec->dev,
                                "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, "ASoC: %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_unregister(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,
                        "ASoC: 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) {
                dev_err(card->dev,
                        "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) {
                                dev_err(card->dev,
                                        "ASoC: failed to instantiate card %d\n",
                                        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) {
                                dev_err(card->dev,
                                        "ASoC: failed to instantiate card %d\n",
                                        ret);
                                goto probe_dai_err;
                        }
                }
        }

        for (i = 0; i < card->num_aux_devs; i++) {
                ret = soc_probe_aux_dev(card, i);
                if (ret < 0) {
                        dev_err(card->dev,
                                "ASoC: failed to add auxiliary devices %d\n",
                                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,
                                         "ASoC: 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,
                                         "ASoC: 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,
                                         "ASoC: 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, "ASoC: %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) {
                dev_err(card->dev, "ASoC: failed to register soundcard %d\n",
                                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) {
                        dev_err(card->dev,
                                "ASoC: failed to register AC97: %d\n", 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,
};

/**
 * snd_soc_codec_volatile_register: Report if a register is volatile.
 *
 * @codec: CODEC to query.
 * @reg: Register to query.
 *
 * Boolean function indiciating if a CODEC register is volatile.
 */
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);

/**
 * snd_soc_codec_readable_register: Report if a register is readable.
 *
 * @codec: CODEC to query.
 * @reg: Register to query.
 *
 * Boolean function indicating if a CODEC register is readable.
 */
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);

/**
 * snd_soc_codec_writable_register: Report if a register is writable.
 *
 * @codec: CODEC to query.
 * @reg: Register to query.
 *
 * Boolean function indicating if a CODEC register is writable.
 */
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, "ASoC: 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, "ASoC: 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);

/**
 * snd_soc_new_ac97_codec - initailise AC97 device
 * @codec: audio codec
 * @ops: AC97 bus operations
 * @num: AC97 codec number
 *
 * Initialises AC97 codec resources for use by ad-hoc devices only.
 */
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);

static struct snd_ac97_reset_cfg snd_ac97_rst_cfg;

static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97)
{
        struct pinctrl *pctl = snd_ac97_rst_cfg.pctl;

        pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset);

        gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 1);

        udelay(10);

        gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0);

        pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run);
        msleep(2);
}

static void snd_soc_ac97_reset(struct snd_ac97 *ac97)
{
        struct pinctrl *pctl = snd_ac97_rst_cfg.pctl;

        pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset);

        gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0);
        gpio_direction_output(snd_ac97_rst_cfg.gpio_sdata, 0);
        gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 0);

        udelay(10);

        gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 1);

        pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run);
        msleep(2);
}

static int snd_soc_ac97_parse_pinctl(struct device *dev,
                struct snd_ac97_reset_cfg *cfg)
{
        struct pinctrl *p;
        struct pinctrl_state *state;
        int gpio;
        int ret;

        p = devm_pinctrl_get(dev);
        if (IS_ERR(p)) {
                dev_err(dev, "Failed to get pinctrl\n");
                return PTR_RET(p);
        }
        cfg->pctl = p;

        state = pinctrl_lookup_state(p, "ac97-reset");
        if (IS_ERR(state)) {
                dev_err(dev, "Can't find pinctrl state ac97-reset\n");
                return PTR_RET(state);
        }
        cfg->pstate_reset = state;

        state = pinctrl_lookup_state(p, "ac97-warm-reset");
        if (IS_ERR(state)) {
                dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n");
                return PTR_RET(state);
        }
        cfg->pstate_warm_reset = state;

        state = pinctrl_lookup_state(p, "ac97-running");
        if (IS_ERR(state)) {
                dev_err(dev, "Can't find pinctrl state ac97-running\n");
                return PTR_RET(state);
        }
        cfg->pstate_run = state;

        gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0);
        if (gpio < 0) {
                dev_err(dev, "Can't find ac97-sync gpio\n");
                return gpio;
        }
        ret = devm_gpio_request(dev, gpio, "AC97 link sync");
        if (ret) {
                dev_err(dev, "Failed requesting ac97-sync gpio\n");
                return ret;
        }
        cfg->gpio_sync = gpio;

        gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1);
        if (gpio < 0) {
                dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio);
                return gpio;
        }
        ret = devm_gpio_request(dev, gpio, "AC97 link sdata");
        if (ret) {
                dev_err(dev, "Failed requesting ac97-sdata gpio\n");
                return ret;
        }
        cfg->gpio_sdata = gpio;

        gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2);
        if (gpio < 0) {
                dev_err(dev, "Can't find ac97-reset gpio\n");
                return gpio;
        }
        ret = devm_gpio_request(dev, gpio, "AC97 link reset");
        if (ret) {
                dev_err(dev, "Failed requesting ac97-reset gpio\n");
                return ret;
        }
        cfg->gpio_reset = gpio;

        return 0;
}

struct snd_ac97_bus_ops *soc_ac97_ops;
EXPORT_SYMBOL_GPL(soc_ac97_ops);

int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops)
{
        if (ops == soc_ac97_ops)
                return 0;

        if (soc_ac97_ops && ops)
                return -EBUSY;

        soc_ac97_ops = ops;

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops);

/**
 * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions
 *
 * This function sets the reset and warm_reset properties of ops and parses
 * the device node of pdev to get pinctrl states and gpio numbers to use.
 */
int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops,
                struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct snd_ac97_reset_cfg cfg;
        int ret;

        ret = snd_soc_ac97_parse_pinctl(dev, &cfg);
        if (ret)
                return ret;

        ret = snd_soc_set_ac97_ops(ops);
        if (ret)
                return ret;

        ops->warm_reset = snd_soc_ac97_warm_reset;
        ops->reset = snd_soc_ac97_reset;

        snd_ac97_rst_cfg = cfg;
        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset);

/**
 * snd_soc_free_ac97_codec - free AC97 codec device
 * @codec: audio codec
 *
 * Frees AC97 codec device resources.
 */
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);

/**
 * snd_soc_update_bits - update codec register bits
 * @codec: audio codec
 * @reg: codec register
 * @mask: register mask
 * @value: new value
 *
 * Writes new register value.
 *
 * Returns 1 for change, 0 for no change, or negative error code.
 */
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);

/**
 * snd_soc_update_bits_locked - update codec register bits
 * @codec: audio codec
 * @reg: codec register
 * @mask: register mask
 * @value: new value
 *
 * Writes new register value, and takes the codec mutex.
 *
 * Returns 1 for change else 0.
 */
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);

/**
 * snd_soc_test_bits - test register for change
 * @codec: audio codec
 * @reg: codec register
 * @mask: register mask
 * @value: new value
 *
 * Tests a register with a new value and checks if the new value is
 * different from the old value.
 *
 * Returns 1 for change else 0.
 */
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);

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

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

        if (!long_name)
                long_name = template.name;

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

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

        kcontrol = snd_ctl_new1(&template, data);

        kfree(name);

        return kcontrol;
}
EXPORT_SYMBOL_GPL(snd_soc_cnew);

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

        for (i = 0; i < num_controls; i++) {
                const struct snd_kcontrol_new *control = &controls[i];
                err = snd_ctl_add(card, snd_soc_cnew(control, data,
                                                     control->name, prefix));
                if (err < 0) {
                        dev_err(dev, "ASoC: Failed to add %s: %d\n",
                                control->name, err);
                        return err;
                }
        }

        return 0;
}

/**
 * snd_soc_add_codec_controls - add an array of controls to a codec.
 * Convenience function to add a list of controls. Many codecs were
 * duplicating this code.
 *
 * @codec: codec to add controls to
 * @controls: array of controls to add
 * @num_controls: number of elements in the array
 *
 * Return 0 for success, else error.
 */
int snd_soc_add_codec_controls(struct snd_soc_codec *codec,
        const struct snd_kcontrol_new *controls, 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);

/**
 * snd_soc_add_platform_controls - add an array of controls to a platform.
 * Convenience function to add a list of controls.
 *
 * @platform: platform to add controls to
 * @controls: array of controls to add
 * @num_controls: number of elements in the array
 *
 * Return 0 for success, else error.
 */
int snd_soc_add_platform_controls(struct snd_soc_platform *platform,
        const struct snd_kcontrol_new *controls, 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);

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

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

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

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

/**
 * snd_soc_info_enum_double - enumerated double mixer info callback
 * @kcontrol: mixer control
 * @uinfo: control element information
 *
 * Callback to provide information about a double enumerated
 * mixer control.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_get_enum_double - enumerated double mixer get callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to get the value of a double enumerated mixer.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_put_enum_double - enumerated double mixer put callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to set the value of a double enumerated mixer.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_get_value_enum_double - semi enumerated double mixer get callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to get the value of a double semi enumerated mixer.
 *
 * Semi enumerated mixer: the enumerated items are referred as values. Can be
 * used for handling bitfield coded enumeration for example.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_put_value_enum_double - semi enumerated double mixer put callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to set the value of a double semi enumerated mixer.
 *
 * Semi enumerated mixer: the enumerated items are referred as values. Can be
 * used for handling bitfield coded enumeration for example.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_info_enum_ext - external enumerated single mixer info callback
 * @kcontrol: mixer control
 * @uinfo: control element information
 *
 * Callback to provide information about an external enumerated
 * single mixer.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_info_volsw_ext - external single mixer info callback
 * @kcontrol: mixer control
 * @uinfo: control element information
 *
 * Callback to provide information about a single external mixer control.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_info_volsw - single mixer info callback
 * @kcontrol: mixer control
 * @uinfo: control element information
 *
 * Callback to provide information about a single mixer control, or a double
 * mixer control that spans 2 registers.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_get_volsw - single mixer get callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to get the value of a single mixer control, or a double mixer
 * control that spans 2 registers.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_put_volsw - single mixer put callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to set the value of a single mixer control, or a double mixer
 * control that spans 2 registers.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_get_volsw_sx - single mixer get callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to get the value of a single mixer control, or a double mixer
 * control that spans 2 registers.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_put_volsw_sx - double mixer set callback
 * @kcontrol: mixer control
 * @uinfo: control element information
 *
 * Callback to set the value of a double mixer control that spans 2 registers.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_info_volsw_s8 - signed mixer info callback
 * @kcontrol: mixer control
 * @uinfo: control element information
 *
 * Callback to provide information about a signed mixer control.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_get_volsw_s8 - signed mixer get callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to get the value of a signed mixer control.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_put_volsw_sgn - signed mixer put callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to set the value of a signed mixer control.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_info_volsw_range - single mixer info callback with range.
 * @kcontrol: mixer control
 * @uinfo: control element information
 *
 * Callback to provide information, within a range, about a single
 * mixer control.
 *
 * returns 0 for success.
 */
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 = snd_soc_volsw_is_stereo(mc) ? 2 : 1;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = platform_max - min;

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_info_volsw_range);

/**
 * snd_soc_put_volsw_range - single mixer put value callback with range.
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to set the value, within a range, for a single mixer control.
 *
 * Returns 0 for success.
 */
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 rreg = mc->rreg;
        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;
        int ret;

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

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

        if (snd_soc_volsw_is_stereo(mc)) {
                val = ((ucontrol->value.integer.value[1] + min) & mask);
                if (invert)
                        val = max - val;
                val_mask = mask << shift;
                val = val << shift;

                ret = snd_soc_update_bits_locked(codec, rreg, val_mask, val);
        }

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_put_volsw_range);

/**
 * snd_soc_get_volsw_range - single mixer get callback with range
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to get the value, within a range, of a single mixer control.
 *
 * Returns 0 for success.
 */
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 rreg = mc->rreg;
        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;

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

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_get_volsw_range);

/**
 * snd_soc_limit_volume - Set new limit to an existing volume control.
 *
 * @codec: where to look for the control
 * @name: Name of the control
 * @max: new maximum limit
 *
 * Return 0 for success, else error.
 */
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;

        len = params->num_regs * codec->val_bytes;

        data = kmemdup(ucontrol->value.bytes.data, len, GFP_KERNEL | GFP_DMA);
        if (!data)
                return -ENOMEM;

        /*
         * 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)
                        goto out;

                val &= params->mask;

                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:
                        ret = -EINVAL;
                        goto out;
                }
        }

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

out:
        kfree(data);

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_bytes_put);

/**
 * snd_soc_info_xr_sx - signed multi register info callback
 * @kcontrol: mreg control
 * @uinfo: control element information
 *
 * Callback to provide information of a control that can
 * span multiple codec registers which together
 * forms a single signed value in a MSB/LSB manner.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_get_xr_sx - signed multi register get callback
 * @kcontrol: mreg control
 * @ucontrol: control element information
 *
 * Callback to get the value of a control that can span
 * multiple codec registers which together forms a single
 * signed value in a MSB/LSB manner. The control supports
 * specifying total no of bits used to allow for bitfields
 * across the multiple codec registers.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_put_xr_sx - signed multi register get callback
 * @kcontrol: mreg control
 * @ucontrol: control element information
 *
 * Callback to set the value of a control that can span
 * multiple codec registers which together forms a single
 * signed value in a MSB/LSB manner. The control supports
 * specifying total no of bits used to allow for bitfields
 * across the multiple codec registers.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_get_strobe - strobe get callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback get the value of a strobe mixer control.
 *
 * Returns 0 for success.
 */
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);

/**
 * snd_soc_put_strobe - strobe put callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback strobe a register bit to high then low (or the inverse)
 * in one pass of a single mixer enum control.
 *
 * Returns 1 for success.
 */
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);

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

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

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

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

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

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

/**
 * snd_soc_dai_set_tdm_slot - configure DAI TDM.
 * @dai: DAI
 * @tx_mask: bitmask representing active TX slots.
 * @rx_mask: bitmask representing active RX slots.
 * @slots: Number of slots in use.
 * @slot_width: Width in bits for each slot.
 *
 * Configures a DAI for TDM operation. Both mask and slots are codec and DAI
 * specific.
 */
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);

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

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

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

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

/**
 * snd_soc_register_card - Register a card with the ASoC core
 *
 * @card: Card to register
 *
 */
int snd_soc_register_card(struct snd_soc_card *card)
{
        int i, ret;

        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,
                                "ASoC: 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,
                                "ASoC: codec_dai_name not set for %s\n",
                                link->name);
                        return -EINVAL;
                }

                /*
                 * Platform may be specified by either name or OF node, but
                 * can be left unspecified, and a dummy platform will be used.
                 */
                if (link->platform_name && link->platform_of_node) {
                        dev_err(card->dev,
                                "ASoC: Both platform name/of_node are set for %s\n",
                                link->name);
                        return -EINVAL;
                }

                /*
                 * CPU device may be specified by either name or OF node, but
                 * can be left unspecified, and will be matched based on DAI
                 * name alone..
                 */
                if (link->cpu_name && link->cpu_of_node) {
                        dev_err(card->dev,
                                "ASoC: Neither/both cpu name/of_node are set for %s\n",
                                link->name);
                        return -EINVAL;
                }
                /*
                 * At least one of CPU DAI name or CPU device name/node must be
                 * specified
                 */
                if (!link->cpu_dai_name &&
                    !(link->cpu_name || link->cpu_of_node)) {
                        dev_err(card->dev,
                                "ASoC: Neither cpu_dai_name nor cpu_name/of_node are set for %s\n",
                                link->name);
                        return -EINVAL;
                }
        }

        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);

/**
 * snd_soc_unregister_card - Unregister a card with the ASoC core
 *
 * @card: Card to unregister
 *
 */
int snd_soc_unregister_card(struct snd_soc_card *card)
{
        if (card->instantiated)
                soc_cleanup_card_resources(card);
        dev_dbg(card->dev, "ASoC: Unregistered card '%s'\n", card->name);

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_card);

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

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

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

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

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

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

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

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

        return kstrdup(name, GFP_KERNEL);
}

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

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

/**
 * snd_soc_register_dai - Register a DAI with the ASoC core
 *
 * @dai: DAI to register
 */
static 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, "ASoC: 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, "ASoC: 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);

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

        return 0;
}

/**
 * snd_soc_unregister_dai - Unregister a DAI from the ASoC core
 *
 * @dai: DAI to unregister
 */
static 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);

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

/**
 * snd_soc_register_dais - Register multiple DAIs with the ASoC core
 *
 * @dai: Array of DAIs to register
 * @count: Number of DAIs
 */
static 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, "ASoC: 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,
                                        "ASoC: 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);

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

        return 0;

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

        return ret;
}

/**
 * snd_soc_unregister_dais - Unregister multiple DAIs from the ASoC core
 *
 * @dai: Array of DAIs to unregister
 * @count: Number of DAIs
 */
static void snd_soc_unregister_dais(struct device *dev, size_t count)
{
        int i;

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

/**
 * snd_soc_add_platform - Add a platform to the ASoC core
 * @dev: The parent device for the platform
 * @platform: The platform to add
 * @platform_driver: The driver for the platform
 */
int snd_soc_add_platform(struct device *dev, struct snd_soc_platform *platform,
                const struct snd_soc_platform_driver *platform_drv)
{
        /* create platform component name */
        platform->name = fmt_single_name(dev, &platform->id);
        if (platform->name == NULL)
                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);

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

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_add_platform);

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

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

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

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

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_platform);

/**
 * snd_soc_remove_platform - Remove a platform from the ASoC core
 * @platform: the platform to remove
 */
void snd_soc_remove_platform(struct snd_soc_platform *platform)
{
        mutex_lock(&client_mutex);
        list_del(&platform->list);
        mutex_unlock(&client_mutex);

        dev_dbg(platform->dev, "ASoC: Unregistered platform '%s'\n",
                platform->name);
        kfree(platform->name);
}
EXPORT_SYMBOL_GPL(snd_soc_remove_platform);

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

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

        return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_lookup_platform);

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

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

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

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

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

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

/**
 * snd_soc_register_codec - Register a codec with the ASoC core
 *
 * @codec: codec to register
 */
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) {
                ret = -ENOMEM;
                goto fail_codec;
        }

        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 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_codec_name;
                        }
                }
        }

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

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

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

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

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

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

found:
        snd_soc_unregister_dais(dev, codec->num_dai);

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

        dev_dbg(codec->dev, "ASoC: 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);


/**
 * snd_soc_register_component - Register a component with the ASoC core
 *
 */
int snd_soc_register_component(struct device *dev,
                         const struct snd_soc_component_driver *cmpnt_drv,
                         struct snd_soc_dai_driver *dai_drv,
                         int num_dai)
{
        struct snd_soc_component *cmpnt;
        int ret;

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

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

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

        cmpnt->dev      = dev;
        cmpnt->driver   = cmpnt_drv;
        cmpnt->num_dai  = num_dai;

        /*
         * snd_soc_register_dai()  uses fmt_single_name(), and
         * snd_soc_register_dais() uses fmt_multiple_name()
         * for dai->name which is used for name based matching
         */
        if (1 == num_dai)
                ret = snd_soc_register_dai(dev, dai_drv);
        else
                ret = snd_soc_register_dais(dev, dai_drv, num_dai);
        if (ret < 0) {
                dev_err(dev, "ASoC: Failed to regster DAIs: %d\n", ret);
                goto error_component_name;
        }

        mutex_lock(&client_mutex);
        list_add(&cmpnt->list, &component_list);
        mutex_unlock(&client_mutex);

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

        return ret;

error_component_name:
        kfree(cmpnt->name);

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_component);

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

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

found:
        snd_soc_unregister_dais(dev, cmpnt->num_dai);

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

        dev_dbg(dev, "ASoC: Unregistered component '%s'\n", cmpnt->name);
        kfree(cmpnt->name);
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_component);

/* Retrieve a card's name from device tree */
int snd_soc_of_parse_card_name(struct snd_soc_card *card,
                               const char *propname)
{
        struct device_node *np = 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,
                        "ASoC: 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,
                        "ASoC: Property '%s' does not exist or its length is not even\n",
                        propname);
                return -EINVAL;
        }
        num_routes /= 2;
        if (!num_routes) {
                dev_err(card->dev, "ASoC: Property '%s's length is zero\n",
                        propname);
                return -EINVAL;
        }

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

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

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

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_routing);

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

        if (!prefix)
                prefix = "";

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

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

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

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

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

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

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

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

        return format;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_daifmt);

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, lrg@slimlogic.co.uk");
MODULE_DESCRIPTION("ALSA SoC Core");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:soc-audio");