ASoC: Fix compile error if CONFIG_DEBUG_FS is not configured

[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/slab.h>
#include <sound/ac97_codec.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>

#define NAME_SIZE       32

static DEFINE_MUTEX(pcm_mutex);
static DECLARE_WAIT_QUEUE_HEAD(soc_pm_waitq);

#ifdef CONFIG_DEBUG_FS
static struct dentry *debugfs_root;
#endif

static DEFINE_MUTEX(client_mutex);
static LIST_HEAD(card_list);
static LIST_HEAD(dai_list);
static LIST_HEAD(platform_list);
static LIST_HEAD(codec_list);

static int snd_soc_register_card(struct snd_soc_card *card);
static int snd_soc_unregister_card(struct snd_soc_card *card);
static int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num);

/*
 * 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)");

/*
 * This function forces any delayed work to be queued and run.
 */
static int run_delayed_work(struct delayed_work *dwork)
{
        int ret;

        /* cancel any work waiting to be queued. */
        ret = cancel_delayed_work(dwork);

        /* if there was any work waiting then we run it now and
         * wait for it's completion */
        if (ret) {
                schedule_delayed_work(dwork, 0);
                flush_scheduled_work();
        }
        return ret;
}

/* codec register dump */
static ssize_t soc_codec_reg_show(struct snd_soc_codec *codec, char *buf)
{
        int ret, i, step = 1, count = 0;

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

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

        count += sprintf(buf, "%s registers\n", codec->name);
        for (i = 0; i < codec->driver->reg_cache_size; i += step) {
                if (codec->driver->readable_register && !codec->driver->readable_register(i))
                        continue;

                count += sprintf(buf + count, "%2x: ", i);
                if (count >= PAGE_SIZE - 1)
                        break;

                if (codec->driver->display_register) {
                        count += codec->driver->display_register(codec, buf + count,
                                                         PAGE_SIZE - count, i);
                } else {
                        /* If the read fails it's almost certainly due to
                         * the register being volatile and the device being
                         * powered off.
                         */
                        ret = codec->driver->read(codec, i);
                        if (ret >= 0)
                                count += snprintf(buf + count,
                                                  PAGE_SIZE - count,
                                                  "%4x", ret);
                        else
                                count += snprintf(buf + count,
                                                  PAGE_SIZE - count,
                                                  "<no data: %d>", ret);
                }

                if (count >= PAGE_SIZE - 1)
                        break;

                count += snprintf(buf + count, PAGE_SIZE - count, "\n");
                if (count >= PAGE_SIZE - 1)
                        break;
        }

        /* Truncate count; min() would cause a warning */
        if (count >= PAGE_SIZE)
                count = PAGE_SIZE - 1;

        return count;
}
static ssize_t codec_reg_show(struct device *dev,
        struct device_attribute *attr, char *buf)
{
        struct snd_soc_pcm_runtime *rtd =
                        container_of(dev, struct snd_soc_pcm_runtime, dev);

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

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 =
                        container_of(dev, struct snd_soc_pcm_runtime, 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 =
                        container_of(dev, struct snd_soc_pcm_runtime, 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 int codec_reg_open_file(struct inode *inode, struct file *file)
{
        file->private_data = inode->i_private;
        return 0;
}

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 = kmalloc(PAGE_SIZE, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;
        ret = soc_codec_reg_show(codec, buf);
        if (ret >= 0)
                ret = simple_read_from_buffer(user_buf, count, ppos, buf, 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];
        int buf_size;
        char *start = buf;
        unsigned long reg, value;
        int step = 1;
        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;

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

        while (*start == ' ')
                start++;
        reg = simple_strtoul(start, &start, 16);
        if ((reg >= codec->driver->reg_cache_size) || (reg % step))
                return -EINVAL;
        while (*start == ' ')
                start++;
        if (strict_strtoul(start, 16, &value))
                return -EINVAL;
        codec->driver->write(codec, reg, value);
        return buf_size;
}

static const struct file_operations codec_reg_fops = {
        .open = codec_reg_open_file,
        .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) {
                printk(KERN_WARNING
                       "ASoC: Failed to create codec debugfs directory\n");
                return;
        }

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

        codec->dapm.debugfs_dapm = debugfs_create_dir("dapm",
                                                 codec->debugfs_codec_root);
        if (!codec->dapm.debugfs_dapm)
                printk(KERN_WARNING
                       "Failed to create DAPM debugfs directory\n");

        snd_soc_dapm_debugfs_init(&codec->dapm);
}

static void soc_cleanup_codec_debugfs(struct snd_soc_codec *codec)
{
        debugfs_remove_recursive(codec->debugfs_codec_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,
                                                     debugfs_root);
        if (!card->debugfs_card_root) {
                dev_warn(card->dev,
                         "ASoC: Failed to create codec debugfs directory\n");
                return;
        }

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

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

#else

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

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

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

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

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

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

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

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

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

static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        struct snd_soc_dai *codec_dai = rtd->codec_dai;
        int ret;

        if (codec_dai->driver->symmetric_rates || cpu_dai->driver->symmetric_rates ||
                        rtd->dai_link->symmetric_rates) {
                dev_dbg(&rtd->dev, "Symmetry forces %dHz rate\n",
                                rtd->rate);

                ret = snd_pcm_hw_constraint_minmax(substream->runtime,
                                                   SNDRV_PCM_HW_PARAM_RATE,
                                                   rtd->rate,
                                                   rtd->rate);
                if (ret < 0) {
                        dev_err(&rtd->dev,
                                "Unable to apply rate symmetry constraint: %d\n", ret);
                        return ret;
                }
        }

        return 0;
}

/*
 * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 * then initialized and any private data can be allocated. This also calls
 * startup for the cpu DAI, platform, machine and codec DAI.
 */
static int soc_pcm_open(struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        struct snd_soc_dai *codec_dai = rtd->codec_dai;
        struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
        struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
        int ret = 0;

        mutex_lock(&pcm_mutex);

        /* startup the audio subsystem */
        if (cpu_dai->driver->ops->startup) {
                ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
                if (ret < 0) {
                        printk(KERN_ERR "asoc: can't open interface %s\n",
                                cpu_dai->name);
                        goto out;
                }
        }

        if (platform->driver->ops->open) {
                ret = platform->driver->ops->open(substream);
                if (ret < 0) {
                        printk(KERN_ERR "asoc: can't open platform %s\n", platform->name);
                        goto platform_err;
                }
        }

        if (codec_dai->driver->ops->startup) {
                ret = codec_dai->driver->ops->startup(substream, codec_dai);
                if (ret < 0) {
                        printk(KERN_ERR "asoc: can't open codec %s\n",
                                codec_dai->name);
                        goto codec_dai_err;
                }
        }

        if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
                ret = rtd->dai_link->ops->startup(substream);
                if (ret < 0) {
                        printk(KERN_ERR "asoc: %s startup failed\n", rtd->dai_link->name);
                        goto machine_err;
                }
        }

        /* Check that the codec and cpu DAI's are compatible */
        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                runtime->hw.rate_min =
                        max(codec_dai_drv->playback.rate_min,
                            cpu_dai_drv->playback.rate_min);
                runtime->hw.rate_max =
                        min(codec_dai_drv->playback.rate_max,
                            cpu_dai_drv->playback.rate_max);
                runtime->hw.channels_min =
                        max(codec_dai_drv->playback.channels_min,
                                cpu_dai_drv->playback.channels_min);
                runtime->hw.channels_max =
                        min(codec_dai_drv->playback.channels_max,
                                cpu_dai_drv->playback.channels_max);
                runtime->hw.formats =
                        codec_dai_drv->playback.formats & cpu_dai_drv->playback.formats;
                runtime->hw.rates =
                        codec_dai_drv->playback.rates & cpu_dai_drv->playback.rates;
                if (codec_dai_drv->playback.rates
                           & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
                        runtime->hw.rates |= cpu_dai_drv->playback.rates;
                if (cpu_dai_drv->playback.rates
                           & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
                        runtime->hw.rates |= codec_dai_drv->playback.rates;
        } else {
                runtime->hw.rate_min =
                        max(codec_dai_drv->capture.rate_min,
                            cpu_dai_drv->capture.rate_min);
                runtime->hw.rate_max =
                        min(codec_dai_drv->capture.rate_max,
                            cpu_dai_drv->capture.rate_max);
                runtime->hw.channels_min =
                        max(codec_dai_drv->capture.channels_min,
                                cpu_dai_drv->capture.channels_min);
                runtime->hw.channels_max =
                        min(codec_dai_drv->capture.channels_max,
                                cpu_dai_drv->capture.channels_max);
                runtime->hw.formats =
                        codec_dai_drv->capture.formats & cpu_dai_drv->capture.formats;
                runtime->hw.rates =
                        codec_dai_drv->capture.rates & cpu_dai_drv->capture.rates;
                if (codec_dai_drv->capture.rates
                           & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
                        runtime->hw.rates |= cpu_dai_drv->capture.rates;
                if (cpu_dai_drv->capture.rates
                           & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
                        runtime->hw.rates |= codec_dai_drv->capture.rates;
        }

        snd_pcm_limit_hw_rates(runtime);
        if (!runtime->hw.rates) {
                printk(KERN_ERR "asoc: %s <-> %s No matching rates\n",
                        codec_dai->name, cpu_dai->name);
                goto config_err;
        }
        if (!runtime->hw.formats) {
                printk(KERN_ERR "asoc: %s <-> %s No matching formats\n",
                        codec_dai->name, cpu_dai->name);
                goto config_err;
        }
        if (!runtime->hw.channels_min || !runtime->hw.channels_max) {
                printk(KERN_ERR "asoc: %s <-> %s No matching channels\n",
                                codec_dai->name, cpu_dai->name);
                goto config_err;
        }

        /* Symmetry only applies if we've already got an active stream. */
        if (cpu_dai->active || codec_dai->active) {
                ret = soc_pcm_apply_symmetry(substream);
                if (ret != 0)
                        goto config_err;
        }

        pr_debug("asoc: %s <-> %s info:\n",
                        codec_dai->name, cpu_dai->name);
        pr_debug("asoc: rate mask 0x%x\n", runtime->hw.rates);
        pr_debug("asoc: min ch %d max ch %d\n", runtime->hw.channels_min,
                 runtime->hw.channels_max);
        pr_debug("asoc: min rate %d max rate %d\n", runtime->hw.rate_min,
                 runtime->hw.rate_max);

        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                cpu_dai->playback_active++;
                codec_dai->playback_active++;
        } else {
                cpu_dai->capture_active++;
                codec_dai->capture_active++;
        }
        cpu_dai->active++;
        codec_dai->active++;
        rtd->codec->active++;
        mutex_unlock(&pcm_mutex);
        return 0;

config_err:
        if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
                rtd->dai_link->ops->shutdown(substream);

machine_err:
        if (codec_dai->driver->ops->shutdown)
                codec_dai->driver->ops->shutdown(substream, codec_dai);

codec_dai_err:
        if (platform->driver->ops->close)
                platform->driver->ops->close(substream);

platform_err:
        if (cpu_dai->driver->ops->shutdown)
                cpu_dai->driver->ops->shutdown(substream, cpu_dai);
out:
        mutex_unlock(&pcm_mutex);
        return ret;
}

/*
 * Power down the audio subsystem pmdown_time msecs after close is called.
 * This is to ensure there are no pops or clicks in between any music tracks
 * due to DAPM power cycling.
 */
static void close_delayed_work(struct work_struct *work)
{
        struct snd_soc_pcm_runtime *rtd =
                        container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
        struct snd_soc_dai *codec_dai = rtd->codec_dai;

        mutex_lock(&pcm_mutex);

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

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

        mutex_unlock(&pcm_mutex);
}

/*
 * Called by ALSA when a PCM substream is closed. Private data can be
 * freed here. The cpu DAI, codec DAI, machine and platform are also
 * shutdown.
 */
static int soc_codec_close(struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        struct snd_soc_dai *codec_dai = rtd->codec_dai;
        struct snd_soc_codec *codec = rtd->codec;

        mutex_lock(&pcm_mutex);

        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                cpu_dai->playback_active--;
                codec_dai->playback_active--;
        } else {
                cpu_dai->capture_active--;
                codec_dai->capture_active--;
        }

        cpu_dai->active--;
        codec_dai->active--;
        codec->active--;

        /* Muting the DAC suppresses artifacts caused during digital
         * shutdown, for example from stopping clocks.
         */
        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                snd_soc_dai_digital_mute(codec_dai, 1);

        if (cpu_dai->driver->ops->shutdown)
                cpu_dai->driver->ops->shutdown(substream, cpu_dai);

        if (codec_dai->driver->ops->shutdown)
                codec_dai->driver->ops->shutdown(substream, codec_dai);

        if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
                rtd->dai_link->ops->shutdown(substream);

        if (platform->driver->ops->close)
                platform->driver->ops->close(substream);
        cpu_dai->runtime = NULL;

        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                /* start delayed pop wq here for playback streams */
                codec_dai->pop_wait = 1;
                schedule_delayed_work(&rtd->delayed_work,
                        msecs_to_jiffies(rtd->pmdown_time));
        } else {
                /* capture streams can be powered down now */
                snd_soc_dapm_stream_event(rtd,
                        codec_dai->driver->capture.stream_name,
                        SND_SOC_DAPM_STREAM_STOP);
        }

        mutex_unlock(&pcm_mutex);
        return 0;
}

/*
 * Called by ALSA when the PCM substream is prepared, can set format, sample
 * rate, etc.  This function is non atomic and can be called multiple times,
 * it can refer to the runtime info.
 */
static int soc_pcm_prepare(struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        struct snd_soc_dai *codec_dai = rtd->codec_dai;
        int ret = 0;

        mutex_lock(&pcm_mutex);

        if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
                ret = rtd->dai_link->ops->prepare(substream);
                if (ret < 0) {
                        printk(KERN_ERR "asoc: machine prepare error\n");
                        goto out;
                }
        }

        if (platform->driver->ops->prepare) {
                ret = platform->driver->ops->prepare(substream);
                if (ret < 0) {
                        printk(KERN_ERR "asoc: platform prepare error\n");
                        goto out;
                }
        }

        if (codec_dai->driver->ops->prepare) {
                ret = codec_dai->driver->ops->prepare(substream, codec_dai);
                if (ret < 0) {
                        printk(KERN_ERR "asoc: codec DAI prepare error\n");
                        goto out;
                }
        }

        if (cpu_dai->driver->ops->prepare) {
                ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
                if (ret < 0) {
                        printk(KERN_ERR "asoc: cpu DAI prepare error\n");
                        goto out;
                }
        }

        /* cancel any delayed stream shutdown that is pending */
        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
            codec_dai->pop_wait) {
                codec_dai->pop_wait = 0;
                cancel_delayed_work(&rtd->delayed_work);
        }

        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                snd_soc_dapm_stream_event(rtd,
                                          codec_dai->driver->playback.stream_name,
                                          SND_SOC_DAPM_STREAM_START);
        else
                snd_soc_dapm_stream_event(rtd,
                                          codec_dai->driver->capture.stream_name,
                                          SND_SOC_DAPM_STREAM_START);

        snd_soc_dai_digital_mute(codec_dai, 0);

out:
        mutex_unlock(&pcm_mutex);
        return ret;
}

/*
 * Called by ALSA when the hardware params are set by application. This
 * function can also be called multiple times and can allocate buffers
 * (using snd_pcm_lib_* ). It's non-atomic.
 */
static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
                                struct snd_pcm_hw_params *params)
{
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        struct snd_soc_dai *codec_dai = rtd->codec_dai;
        int ret = 0;

        mutex_lock(&pcm_mutex);

        if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
                ret = rtd->dai_link->ops->hw_params(substream, params);
                if (ret < 0) {
                        printk(KERN_ERR "asoc: machine hw_params failed\n");
                        goto out;
                }
        }

        if (codec_dai->driver->ops->hw_params) {
                ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
                if (ret < 0) {
                        printk(KERN_ERR "asoc: can't set codec %s hw params\n",
                                codec_dai->name);
                        goto codec_err;
                }
        }

        if (cpu_dai->driver->ops->hw_params) {
                ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
                if (ret < 0) {
                        printk(KERN_ERR "asoc: interface %s hw params failed\n",
                                cpu_dai->name);
                        goto interface_err;
                }
        }

        if (platform->driver->ops->hw_params) {
                ret = platform->driver->ops->hw_params(substream, params);
                if (ret < 0) {
                        printk(KERN_ERR "asoc: platform %s hw params failed\n",
                                platform->name);
                        goto platform_err;
                }
        }

        rtd->rate = params_rate(params);

out:
        mutex_unlock(&pcm_mutex);
        return ret;

platform_err:
        if (cpu_dai->driver->ops->hw_free)
                cpu_dai->driver->ops->hw_free(substream, cpu_dai);

interface_err:
        if (codec_dai->driver->ops->hw_free)
                codec_dai->driver->ops->hw_free(substream, codec_dai);

codec_err:
        if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
                rtd->dai_link->ops->hw_free(substream);

        mutex_unlock(&pcm_mutex);
        return ret;
}

/*
 * Free's resources allocated by hw_params, can be called multiple times
 */
static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        struct snd_soc_dai *codec_dai = rtd->codec_dai;
        struct snd_soc_codec *codec = rtd->codec;

        mutex_lock(&pcm_mutex);

        /* apply codec digital mute */
        if (!codec->active)
                snd_soc_dai_digital_mute(codec_dai, 1);

        /* free any machine hw params */
        if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
                rtd->dai_link->ops->hw_free(substream);

        /* free any DMA resources */
        if (platform->driver->ops->hw_free)
                platform->driver->ops->hw_free(substream);

        /* now free hw params for the DAI's  */
        if (codec_dai->driver->ops->hw_free)
                codec_dai->driver->ops->hw_free(substream, codec_dai);

        if (cpu_dai->driver->ops->hw_free)
                cpu_dai->driver->ops->hw_free(substream, cpu_dai);

        mutex_unlock(&pcm_mutex);
        return 0;
}

static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        struct snd_soc_dai *codec_dai = rtd->codec_dai;
        int ret;

        if (codec_dai->driver->ops->trigger) {
                ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
                if (ret < 0)
                        return ret;
        }

        if (platform->driver->ops->trigger) {
                ret = platform->driver->ops->trigger(substream, cmd);
                if (ret < 0)
                        return ret;
        }

        if (cpu_dai->driver->ops->trigger) {
                ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
                if (ret < 0)
                        return ret;
        }
        return 0;
}

/*
 * soc level wrapper for pointer callback
 * If cpu_dai, codec_dai, platform driver has the delay callback, than
 * the runtime->delay will be updated accordingly.
 */
static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        struct snd_soc_dai *codec_dai = rtd->codec_dai;
        struct snd_pcm_runtime *runtime = substream->runtime;
        snd_pcm_uframes_t offset = 0;
        snd_pcm_sframes_t delay = 0;

        if (platform->driver->ops->pointer)
                offset = platform->driver->ops->pointer(substream);

        if (cpu_dai->driver->ops->delay)
                delay += cpu_dai->driver->ops->delay(substream, cpu_dai);

        if (codec_dai->driver->ops->delay)
                delay += codec_dai->driver->ops->delay(substream, codec_dai);

        if (platform->driver->delay)
                delay += platform->driver->delay(substream, codec_dai);

        runtime->delay = delay;

        return offset;
}

/* ASoC PCM operations */
static struct snd_pcm_ops soc_pcm_ops = {
        .open           = soc_pcm_open,
        .close          = soc_codec_close,
        .hw_params      = soc_pcm_hw_params,
        .hw_free        = soc_pcm_hw_free,
        .prepare        = soc_pcm_prepare,
        .trigger        = soc_pcm_trigger,
        .pointer        = soc_pcm_pointer,
};

#ifdef CONFIG_PM
/* powers down audio subsystem for suspend */
static int soc_suspend(struct device *dev)
{
        struct platform_device *pdev = to_platform_device(dev);
        struct snd_soc_card *card = platform_get_drvdata(pdev);
        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 DAC's */
        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(pdev, PMSG_SUSPEND);

        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++) {
                run_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++) {
                struct snd_soc_dai_driver *driver = card->rtd[i].codec_dai->driver;

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

                if (driver->playback.stream_name != NULL)
                        snd_soc_dapm_stream_event(&card->rtd[i], driver->playback.stream_name,
                                SND_SOC_DAPM_STREAM_SUSPEND);

                if (driver->capture.stream_name != NULL)
                        snd_soc_dapm_stream_event(&card->rtd[i], driver->capture.stream_name,
                                SND_SOC_DAPM_STREAM_SUSPEND);
        }

        /* suspend all CODECs */
        for (i = 0; i < card->num_rtd; i++) {
                struct snd_soc_codec *codec = card->rtd[i].codec;
                /* 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:
                        case SND_SOC_BIAS_OFF:
                                codec->driver->suspend(codec, PMSG_SUSPEND);
                                codec->suspended = 1;
                                break;
                        default:
                                dev_dbg(codec->dev, "CODEC is on over suspend\n");
                                break;
                        }
                }
        }

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

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

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

        if (card->suspend_post)
                card->suspend_post(pdev, PMSG_SUSPEND);

        return 0;
}

/* 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 platform_device *pdev = to_platform_device(card->dev);
        int i;

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

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

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

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

        /* 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);
        }

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

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

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

                if (driver->playback.stream_name != NULL)
                        snd_soc_dapm_stream_event(&card->rtd[i], driver->playback.stream_name,
                                SND_SOC_DAPM_STREAM_RESUME);

                if (driver->capture.stream_name != NULL)
                        snd_soc_dapm_stream_event(&card->rtd[i], driver->capture.stream_name,
                                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(pdev);

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

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

/* powers up audio subsystem after a suspend */
static int soc_resume(struct device *dev)
{
        struct platform_device *pdev = to_platform_device(dev);
        struct snd_soc_card *card = platform_get_drvdata(pdev);
        int i;

        /* 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;
                if (cpu_dai->driver->ac97_control) {
                        dev_dbg(dev, "Resuming AC97 immediately\n");
                        soc_resume_deferred(&card->deferred_resume_work);
                } else {
                        dev_dbg(dev, "Scheduling resume work\n");
                        if (!schedule_work(&card->deferred_resume_work))
                                dev_err(dev, "resume work item may be lost\n");
                }
        }

        return 0;
}
#else
#define soc_suspend     NULL
#define soc_resume      NULL
#endif

static 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;

        if (rtd->complete)
                return 1;
        dev_dbg(card->dev, "binding %s at idx %d\n", dai_link->name, num);

        /* do we already have the CPU DAI for this link ? */
        if (rtd->cpu_dai) {
                goto find_codec;
        }
        /* no, then find CPU DAI from registered DAIs*/
        list_for_each_entry(cpu_dai, &dai_list, list) {
                if (!strcmp(cpu_dai->name, dai_link->cpu_dai_name)) {

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

                        rtd->cpu_dai = cpu_dai;
                        goto find_codec;
                }
        }
        dev_dbg(card->dev, "CPU DAI %s not registered\n",
                        dai_link->cpu_dai_name);

find_codec:
        /* do we already have the CODEC for this link ? */
        if (rtd->codec) {
                goto find_platform;
        }

        /* no, then find CODEC from registered CODECs*/
        list_for_each_entry(codec, &codec_list, list) {
                if (!strcmp(codec->name, dai_link->codec_name)) {
                        rtd->codec = codec;

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

                        /* 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;
                                        goto find_platform;
                                }
                        }
                        dev_dbg(card->dev, "CODEC DAI %s not registered\n",
                                        dai_link->codec_dai_name);

                        goto find_platform;
                }
        }
        dev_dbg(card->dev, "CODEC %s not registered\n",
                        dai_link->codec_name);

find_platform:
        /* do we already have the CODEC DAI for this link ? */
        if (rtd->platform) {
                goto out;
        }
        /* no, then find CPU DAI from registered DAIs*/
        list_for_each_entry(platform, &platform_list, list) {
                if (!strcmp(platform->name, dai_link->platform_name)) {

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

                        rtd->platform = platform;
                        goto out;
                }
        }

        dev_dbg(card->dev, "platform %s not registered\n",
                        dai_link->platform_name);
        return 0;

out:
        /* mark rtd as complete if we found all 4 of our client devices */
        if (rtd->codec && rtd->codec_dai && rtd->platform && rtd->cpu_dai) {
                rtd->complete = 1;
                card->num_rtd++;
        }
        return 1;
}

static void soc_remove_dai_link(struct snd_soc_card *card, int 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, *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_unregister(&rtd->dev);
                rtd->dev_registered = 0;
        }

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

        /* remove the platform */
        if (platform && platform->probed) {
                if (platform->driver->remove) {
                        err = platform->driver->remove(platform);
                        if (err < 0)
                                printk(KERN_ERR "asoc: failed to remove %s\n", platform->name);
                }
                platform->probed = 0;
                list_del(&platform->card_list);
                module_put(platform->dev->driver->owner);
        }

        /* remove the CODEC */
        if (codec && codec->probed) {
                if (codec->driver->remove) {
                        err = codec->driver->remove(codec);
                        if (err < 0)
                                printk(KERN_ERR "asoc: failed to remove %s\n", codec->name);
                }

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

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

        /* remove the cpu_dai */
        if (cpu_dai && cpu_dai->probed) {
                if (cpu_dai->driver->remove) {
                        err = cpu_dai->driver->remove(cpu_dai);
                        if (err < 0)
                                printk(KERN_ERR "asoc: failed to remove %s\n", cpu_dai->name);
                }
                cpu_dai->probed = 0;
                list_del(&cpu_dai->card_list);
                module_put(cpu_dai->dev->driver->owner);
        }
}

static void rtd_release(struct device *dev) {}

static int soc_probe_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 = rtd->codec;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *codec_dai = rtd->codec_dai, *cpu_dai = rtd->cpu_dai;
        int ret;

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

        /* config components */
        codec_dai->codec = codec;
        codec->card = card;
        cpu_dai->platform = platform;
        rtd->card = card;
        rtd->dev.parent = card->dev;
        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) {
                if (cpu_dai->driver->probe) {
                        ret = cpu_dai->driver->probe(cpu_dai);
                        if (ret < 0) {
                                printk(KERN_ERR "asoc: failed to probe CPU DAI %s\n",
                                                cpu_dai->name);
                                return ret;
                        }
                }
                cpu_dai->probed = 1;
                /* mark cpu_dai as probed and add to card cpu_dai list */
                list_add(&cpu_dai->card_list, &card->dai_dev_list);
        }

        /* probe the CODEC */
        if (!codec->probed) {
                codec->dapm.card = card;
                if (codec->driver->probe) {
                        ret = codec->driver->probe(codec);
                        if (ret < 0) {
                                printk(KERN_ERR "asoc: failed to probe CODEC %s\n",
                                                codec->name);
                                return ret;
                        }
                }

                soc_init_codec_debugfs(codec);

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

        /* probe the platform */
        if (!platform->probed) {
                if (platform->driver->probe) {
                        ret = platform->driver->probe(platform);
                        if (ret < 0) {
                                printk(KERN_ERR "asoc: failed to probe platform %s\n",
                                                platform->name);
                                return ret;
                        }
                }
                /* mark platform as probed and add to card platform list */
                platform->probed = 1;
                list_add(&platform->card_list, &card->platform_dev_list);
        }

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

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

        /* DAPM dai link stream work */
        INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);

        /* now that all clients have probed, initialise the DAI link */
        if (dai_link->init) {
                ret = dai_link->init(rtd);
                if (ret < 0) {
                        printk(KERN_ERR "asoc: failed to init %s\n", dai_link->stream_name);
                        return ret;
                }
        }

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

        /* register the rtd device */
        rtd->dev.release = rtd_release;
        rtd->dev.init_name = dai_link->name;
        ret = device_register(&rtd->dev);
        if (ret < 0) {
                printk(KERN_ERR "asoc: failed to register DAI runtime device %d\n", ret);
                return ret;
        }

        rtd->dev_registered = 1;
        ret = device_create_file(&rtd->dev, &dev_attr_pmdown_time);
        if (ret < 0)
                printk(KERN_WARNING "asoc: failed to add pmdown_time sysfs\n");

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

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

        /* create the pcm */
        ret = soc_new_pcm(rtd, num);
        if (ret < 0) {
                printk(KERN_ERR "asoc: can't create pcm %s\n", dai_link->stream_name);
                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) {
                        printk(KERN_ERR "asoc: AC97 device register failed\n");
                        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 void snd_soc_instantiate_card(struct snd_soc_card *card)
{
        struct platform_device *pdev = to_platform_device(card->dev);
        int ret, i;

        mutex_lock(&card->mutex);

        if (card->instantiated) {
                mutex_unlock(&card->mutex);
                return;
        }

        /* bind DAIs */
        for (i = 0; i < card->num_links; i++)
                soc_bind_dai_link(card, i);

        /* bind completed ? */
        if (card->num_rtd != card->num_links) {
                mutex_unlock(&card->mutex);
                return;
        }

        /* 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) {
                printk(KERN_ERR "asoc: can't create sound card for card %s\n",
                        card->name);
                mutex_unlock(&card->mutex);
                return;
        }
        card->snd_card->dev = card->dev;

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

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

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

        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->name);

        ret = snd_card_register(card->snd_card);
        if (ret < 0) {
                printk(KERN_ERR "asoc: failed to register soundcard for %s\n", card->name);
                goto probe_dai_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) {
                                printk(KERN_ERR "asoc: failed to register AC97 %s\n", card->name);
                                goto probe_dai_err;
                        }
                }
#endif

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

probe_dai_err:
        for (i = 0; i < card->num_links; i++)
                soc_remove_dai_link(card, i);

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

        snd_card_free(card->snd_card);

        mutex_unlock(&card->mutex);
}

/*
 * Attempt to initialise any uninitialised cards.  Must be called with
 * client_mutex.
 */
static void snd_soc_instantiate_cards(void)
{
        struct snd_soc_card *card;
        list_for_each_entry(card, &card_list, list)
                snd_soc_instantiate_card(card);
}

/* probes a new socdev */
static int soc_probe(struct platform_device *pdev)
{
        struct snd_soc_card *card = platform_get_drvdata(pdev);
        int ret = 0;

        /* Bodge while we unpick instantiation */
        card->dev = &pdev->dev;
        INIT_LIST_HEAD(&card->dai_dev_list);
        INIT_LIST_HEAD(&card->codec_dev_list);
        INIT_LIST_HEAD(&card->platform_dev_list);

        soc_init_card_debugfs(card);

        ret = snd_soc_register_card(card);
        if (ret != 0) {
                dev_err(&pdev->dev, "Failed to register card\n");
                return ret;
        }

        return 0;
}

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

                if (card->instantiated) {

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

                /* remove and free each DAI */
                for (i = 0; i < card->num_rtd; i++)
                        soc_remove_dai_link(card, i);

                soc_cleanup_card_debugfs(card);

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

                kfree(card->rtd);
                snd_card_free(card->snd_card);
        }
        snd_soc_unregister_card(card);
        return 0;
}

static int soc_poweroff(struct device *dev)
{
        struct platform_device *pdev = to_platform_device(dev);
        struct snd_soc_card *card = platform_get_drvdata(pdev);
        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];
                run_delayed_work(&rtd->delayed_work);
        }

        snd_soc_dapm_shutdown(card);

        return 0;
}

static const struct dev_pm_ops soc_pm_ops = {
        .suspend = soc_suspend,
        .resume = soc_resume,
        .poweroff = soc_poweroff,
};

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

/* create a new pcm */
static int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int 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_pcm *pcm;
        char new_name[64];
        int ret = 0, playback = 0, capture = 0;

        /* check client and interface hw capabilities */
        snprintf(new_name, sizeof(new_name), "%s %s-%d",
                        rtd->dai_link->stream_name, codec_dai->name, num);

        if (codec_dai->driver->playback.channels_min)
                playback = 1;
        if (codec_dai->driver->capture.channels_min)
                capture = 1;

        dev_dbg(rtd->card->dev, "registered pcm #%d %s\n",num,new_name);
        ret = snd_pcm_new(rtd->card->snd_card, new_name,
                        num, playback, capture, &pcm);
        if (ret < 0) {
                printk(KERN_ERR "asoc: can't create pcm for codec %s\n", codec->name);
                return ret;
        }

        rtd->pcm = pcm;
        pcm->private_data = rtd;
        soc_pcm_ops.mmap = platform->driver->ops->mmap;
        soc_pcm_ops.pointer = platform->driver->ops->pointer;
        soc_pcm_ops.ioctl = platform->driver->ops->ioctl;
        soc_pcm_ops.copy = platform->driver->ops->copy;
        soc_pcm_ops.silence = platform->driver->ops->silence;
        soc_pcm_ops.ack = platform->driver->ops->ack;
        soc_pcm_ops.page = platform->driver->ops->page;

        if (playback)
                snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &soc_pcm_ops);

        if (capture)
                snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &soc_pcm_ops);

        ret = platform->driver->pcm_new(rtd->card->snd_card, codec_dai, pcm);
        if (ret < 0) {
                printk(KERN_ERR "asoc: platform pcm constructor failed\n");
                return ret;
        }

        pcm->private_free = platform->driver->pcm_free;
        printk(KERN_INFO "asoc: %s <-> %s mapping ok\n", codec_dai->name,
                cpu_dai->name);
        return ret;
}

/**
 * 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, int reg)
{
        if (codec->driver->volatile_register)
                return codec->driver->volatile_register(reg);
        else
                return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_codec_volatile_register);

/**
 * 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);

/**
 * 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->driver->read(codec, reg);
        dev_dbg(codec->dev, "read %x => %x\n", 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);
        return codec->driver->write(codec, reg, val);
}
EXPORT_SYMBOL_GPL(snd_soc_write);

/**
 * 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 else 0.
 */
int snd_soc_update_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;
        if (change)
                snd_soc_write(codec, reg, new);

        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_set_runtime_hwparams - set the runtime hardware parameters
 * @substream: the pcm substream
 * @hw: the hardware parameters
 *
 * Sets the substream runtime hardware parameters.
 */
int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
        const struct snd_pcm_hardware *hw)
{
        struct snd_pcm_runtime *runtime = substream->runtime;
        runtime->hw.info = hw->info;
        runtime->hw.formats = hw->formats;
        runtime->hw.period_bytes_min = hw->period_bytes_min;
        runtime->hw.period_bytes_max = hw->period_bytes_max;
        runtime->hw.periods_min = hw->periods_min;
        runtime->hw.periods_max = hw->periods_max;
        runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
        runtime->hw.fifo_size = hw->fifo_size;
        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);

/**
 * snd_soc_cnew - create new control
 * @_template: control template
 * @data: control private data
 * @long_name: control long name
 *
 * 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, char *long_name)
{
        struct snd_kcontrol_new template;

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

        return snd_ctl_new1(&template, data);
}
EXPORT_SYMBOL_GPL(snd_soc_cnew);

/**
 * snd_soc_add_controls - add an array of controls to a codec.
 * Convienience 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_controls(struct snd_soc_codec *codec,
        const struct snd_kcontrol_new *controls, int num_controls)
{
        struct snd_card *card = codec->card->snd_card;
        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, codec, NULL));
                if (err < 0) {
                        dev_err(codec->dev, "%s: Failed to add %s: %d\n",
                                codec->name, control->name, err);
                        return err;
                }
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_add_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, bitmask;

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

        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, bitmask;

        for (bitmask = 1; bitmask < e->max; bitmask <<= 1)
                ;
        if (ucontrol->value.enumerated.item[0] > e->max - 1)
                return -EINVAL;
        val = ucontrol->value.enumerated.item[0] << e->shift_l;
        mask = (bitmask - 1) << 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 |= (bitmask - 1) << 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.
 *
 * 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;
        unsigned int shift = mc->shift;
        unsigned int rshift = mc->rshift;

        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 = shift == rshift ? 1 : 2;
        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.
 *
 * 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 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 (shift != rshift)
                ucontrol->value.integer.value[1] =
                        (snd_soc_read(codec, reg) >> rshift) & mask;
        if (invert) {
                ucontrol->value.integer.value[0] =
                        max - ucontrol->value.integer.value[0];
                if (shift != rshift)
                        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.
 *
 * 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 shift = mc->shift;
        unsigned int rshift = mc->rshift;
        int max = mc->max;
        unsigned int mask = (1 << fls(max)) - 1;
        unsigned int invert = mc->invert;
        unsigned int val, val2, val_mask;

        val = (ucontrol->value.integer.value[0] & mask);
        if (invert)
                val = max - val;
        val_mask = mask << shift;
        val = val << shift;
        if (shift != rshift) {
                val2 = (ucontrol->value.integer.value[1] & mask);
                if (invert)
                        val2 = max - val2;
                val_mask |= mask << rshift;
                val |= val2 << rshift;
        }
        return snd_soc_update_bits_locked(codec, reg, val_mask, val);
}
EXPORT_SYMBOL_GPL(snd_soc_put_volsw);

/**
 * snd_soc_info_volsw_2r - double mixer info callback
 * @kcontrol: mixer control
 * @uinfo: control element information
 *
 * Callback to provide information about a double mixer control that
 * spans 2 codec registers.
 *
 * Returns 0 for success.
 */
int snd_soc_info_volsw_2r(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 = 2;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = platform_max;
        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_info_volsw_2r);

/**
 * snd_soc_get_volsw_2r - double mixer get callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to get the value of a double mixer control that spans 2 registers.
 *
 * Returns 0 for success.
 */
int snd_soc_get_volsw_2r(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;
        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;
        ucontrol->value.integer.value[1] =
                (snd_soc_read(codec, reg2) >> shift) & mask;
        if (invert) {
                ucontrol->value.integer.value[0] =
                        max - ucontrol->value.integer.value[0];
                ucontrol->value.integer.value[1] =
                        max - ucontrol->value.integer.value[1];
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_get_volsw_2r);

/**
 * snd_soc_put_volsw_2r - double mixer set callback
 * @kcontrol: mixer control
 * @ucontrol: 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_2r(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;
        int max = mc->max;
        unsigned int mask = (1 << fls(max)) - 1;
        unsigned int invert = mc->invert;
        int err;
        unsigned int val, val2, val_mask;

        val_mask = mask << shift;
        val = (ucontrol->value.integer.value[0] & mask);
        val2 = (ucontrol->value.integer.value[1] & mask);

        if (invert) {
                val = max - val;
                val2 = max - val2;
        }

        val = val << shift;
        val2 = val2 << shift;

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

        err = snd_soc_update_bits_locked(codec, reg2, val_mask, val2);
        return err;
}
EXPORT_SYMBOL_GPL(snd_soc_put_volsw_2r);

/**
 * 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_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);

/**
 * snd_soc_info_volsw_2r_sx - double with tlv and variable data size
 *  mixer info callback
 * @kcontrol: mixer control
 * @uinfo: control element information
 *
 * Returns 0 for success.
 */
int snd_soc_info_volsw_2r_sx(struct snd_kcontrol *kcontrol,
                        struct snd_ctl_elem_info *uinfo)
{
        struct soc_mixer_control *mc =
                (struct soc_mixer_control *)kcontrol->private_value;
        int max = mc->max;
        int min = mc->min;

        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 2;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = max-min;

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_info_volsw_2r_sx);

/**
 * snd_soc_get_volsw_2r_sx - double with tlv and variable data size
 *  mixer get callback
 * @kcontrol: mixer control
 * @uinfo: control element information
 *
 * Returns 0 for success.
 */
int snd_soc_get_volsw_2r_sx(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 mask = (1<<mc->shift)-1;
        int min = mc->min;
        int val = snd_soc_read(codec, mc->reg) & mask;
        int valr = snd_soc_read(codec, mc->rreg) & mask;

        ucontrol->value.integer.value[0] = ((val & 0xff)-min) & mask;
        ucontrol->value.integer.value[1] = ((valr & 0xff)-min) & mask;
        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_get_volsw_2r_sx);

/**
 * snd_soc_put_volsw_2r_sx - double with tlv and variable data size
 *  mixer put callback
 * @kcontrol: mixer control
 * @uinfo: control element information
 *
 * Returns 0 for success.
 */
int snd_soc_put_volsw_2r_sx(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 mask = (1<<mc->shift)-1;
        int min = mc->min;
        int ret;
        unsigned int val, valr, oval, ovalr;

        val = ((ucontrol->value.integer.value[0]+min) & 0xff);
        val &= mask;
        valr = ((ucontrol->value.integer.value[1]+min) & 0xff);
        valr &= mask;

        oval = snd_soc_read(codec, mc->reg) & mask;
        ovalr = snd_soc_read(codec, mc->rreg) & mask;

        ret = 0;
        if (oval != val) {
                ret = snd_soc_write(codec, mc->reg, val);
                if (ret < 0)
                        return ret;
        }
        if (ovalr != valr) {
                ret = snd_soc_write(codec, mc->rreg, valr);
                if (ret < 0)
                        return ret;
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_put_volsw_2r_sx);

/**
 * 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
                return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_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
                return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_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 && dai->driver->ops->set_fmt)
                return dai->driver->ops->set_fmt(dai, fmt);
        else
                return -EINVAL;
}
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
 *
 * Mutes the DAI DAC.
 */
int snd_soc_dai_digital_mute(struct snd_soc_dai *dai, int mute)
{
        if (dai->driver && dai->driver->ops->digital_mute)
                return dai->driver->ops->digital_mute(dai, mute);
        else
                return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_digital_mute);

/**
 * snd_soc_register_card - Register a card with the ASoC core
 *
 * @card: Card to register
 *
 * Note that currently this is an internal only function: it will be
 * exposed to machine drivers after further backporting of ASoC v2
 * registration APIs.
 */
static int snd_soc_register_card(struct snd_soc_card *card)
{
        int i;

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

        card->rtd = kzalloc(sizeof(struct snd_soc_pcm_runtime) * card->num_links,
                        GFP_KERNEL);
        if (card->rtd == NULL)
                return -ENOMEM;

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

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

        mutex_lock(&client_mutex);
        list_add(&card->list, &card_list);
        snd_soc_instantiate_cards();
        mutex_unlock(&client_mutex);

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

        return 0;
}

/**
 * snd_soc_unregister_card - Unregister a card with the ASoC core
 *
 * @card: Card to unregister
 *
 * Note that currently this is an internal only function: it will be
 * exposed to machine drivers after further backporting of ASoC v2
 * registration APIs.
 */
static int snd_soc_unregister_card(struct snd_soc_card *card)
{
        mutex_lock(&client_mutex);
        list_del(&card->list);
        mutex_unlock(&client_mutex);
        dev_dbg(card->dev, "Unregistered card '%s'\n", card->name);

        return 0;
}

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

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

        strncpy(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);
                        strncpy(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) {
                printk(KERN_ERR "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
 */
int snd_soc_register_dai(struct device *dev,
                struct snd_soc_dai_driver *dai_drv)
{
        struct snd_soc_dai *dai;

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

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

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

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

        mutex_lock(&client_mutex);
        list_add(&dai->list, &dai_list);
        snd_soc_instantiate_cards();
        mutex_unlock(&client_mutex);

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

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_register_dai);

/**
 * snd_soc_unregister_dai - Unregister a DAI from the ASoC core
 *
 * @dai: DAI to unregister
 */
void snd_soc_unregister_dai(struct device *dev)
{
        struct snd_soc_dai *dai;

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

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

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

/**
 * snd_soc_register_dais - Register multiple DAIs with the ASoC core
 *
 * @dai: Array of DAIs to register
 * @count: Number of DAIs
 */
int snd_soc_register_dais(struct device *dev,
                struct snd_soc_dai_driver *dai_drv, size_t count)
{
        struct snd_soc_dai *dai;
        int i, ret = 0;

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

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

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

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

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

                mutex_lock(&client_mutex);
                list_add(&dai->list, &dai_list);
                mutex_unlock(&client_mutex);

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

        snd_soc_instantiate_cards();
        return 0;

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

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_dais);

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

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

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

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

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

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

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

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

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

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_register_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;

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

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

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

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

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

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

/**
 * snd_soc_register_codec - Register a codec with the ASoC core
 *
 * @codec: codec to register
 */
int snd_soc_register_codec(struct device *dev,
                struct snd_soc_codec_driver *codec_drv,
                struct snd_soc_dai_driver *dai_drv, int num_dai)
{
        struct snd_soc_codec *codec;
        int ret, i;

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

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

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

        INIT_LIST_HEAD(&codec->dapm.widgets);
        INIT_LIST_HEAD(&codec->dapm.paths);
        codec->dapm.bias_level = SND_SOC_BIAS_OFF;
        codec->dapm.dev = dev;
        codec->dapm.codec = codec;

        /* allocate CODEC register cache */
        if (codec_drv->reg_cache_size && codec_drv->reg_word_size) {

                if (codec_drv->reg_cache_default)
                        codec->reg_cache = kmemdup(codec_drv->reg_cache_default,
                                codec_drv->reg_cache_size * codec_drv->reg_word_size, GFP_KERNEL);
                else
                        codec->reg_cache = kzalloc(codec_drv->reg_cache_size *
                                codec_drv->reg_word_size, GFP_KERNEL);

                if (codec->reg_cache == NULL) {
                        kfree(codec->name);
                        kfree(codec);
                        return -ENOMEM;
                }
        }

        codec->dev = dev;
        codec->driver = codec_drv;
        codec->num_dai = num_dai;
        mutex_init(&codec->mutex);

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

        /* register any DAIs */
        if (num_dai) {
                ret = snd_soc_register_dais(dev, dai_drv, num_dai);
                if (ret < 0)
                        goto error;
        }

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

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

error:
        if (codec->reg_cache)
                kfree(codec->reg_cache);
        kfree(codec->name);
        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;
        int i;

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

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

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

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

        if (codec->reg_cache)
                kfree(codec->reg_cache);
        kfree(codec->name);
        kfree(codec);
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_codec);

static int __init snd_soc_init(void)
{
#ifdef CONFIG_DEBUG_FS
        debugfs_root = debugfs_create_dir("asoc", NULL);
        if (IS_ERR(debugfs_root) || !debugfs_root) {
                printk(KERN_WARNING
                       "ASoC: Failed to create debugfs directory\n");
                debugfs_root = NULL;
        }

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

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

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

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

static void __exit snd_soc_exit(void)
{
#ifdef CONFIG_DEBUG_FS
        debugfs_remove_recursive(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");