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wm8727.c

/*
 * wm8727.c
 *
 *  Created on: 15-Oct-2009
 *      Author: neil.jones@imgtec.com
 *
 * Copyright (C) 2009 Imagination Technologies Ltd.
 *
 *  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.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include "wm8727.h"
/*
 * Note this is a simple chip with no configuration interface, sample rate is
 * determined automatically by examining the Master clock and Bit clock ratios
 */
#define WM8727_RATES  (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
                  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 |\
                  SNDRV_PCM_RATE_192000)


struct snd_soc_dai wm8727_dai = {
      .name = "WM8727",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 2,
            .channels_max = 2,
            .rates = WM8727_RATES,
            .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
            },
};
EXPORT_SYMBOL_GPL(wm8727_dai);

static struct snd_soc_codec *wm8727_codec;

static int wm8727_soc_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      int ret = 0;

      BUG_ON(!wm8727_codec);

      socdev->card->codec = wm8727_codec;

      /* register pcms */
      ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
      if (ret < 0) {
            printk(KERN_ERR "wm8727: failed to create pcms\n");
            goto pcm_err;
      }

      return ret;

pcm_err:
      kfree(socdev->card->codec);
      socdev->card->codec = NULL;
      return ret;
}

static int wm8727_soc_remove(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);

      snd_soc_free_pcms(socdev);

      return 0;
}

struct snd_soc_codec_device soc_codec_dev_wm8727 = {
      .probe =    wm8727_soc_probe,
      .remove =   wm8727_soc_remove,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_wm8727);


static __devinit int wm8727_platform_probe(struct platform_device *pdev)
{
      struct snd_soc_codec *codec;
      int ret;

      if (wm8727_codec) {
            dev_err(&pdev->dev, "Another WM8727 is registered\n");
            return -EBUSY;
      }

      codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
      if (codec == NULL)
            return -ENOMEM;
      wm8727_codec = codec;

      platform_set_drvdata(pdev, codec);

      mutex_init(&codec->mutex);
      codec->dev = &pdev->dev;
      codec->name = "WM8727";
      codec->owner = THIS_MODULE;
      codec->dai = &wm8727_dai;
      codec->num_dai = 1;
      INIT_LIST_HEAD(&codec->dapm_widgets);
      INIT_LIST_HEAD(&codec->dapm_paths);

      wm8727_dai.dev = &pdev->dev;

      ret = snd_soc_register_codec(codec);
      if (ret != 0) {
            dev_err(&pdev->dev, "Failed to register CODEC: %d\n", ret);
            goto err;
      }

      ret = snd_soc_register_dai(&wm8727_dai);
      if (ret != 0) {
            dev_err(&pdev->dev, "Failed to register DAI: %d\n", ret);
            goto err_codec;
      }

err_codec:
      snd_soc_unregister_codec(codec);
err:
      kfree(codec);
      return ret;
}

static int __devexit wm8727_platform_remove(struct platform_device *pdev)
{
      snd_soc_unregister_dai(&wm8727_dai);
      snd_soc_unregister_codec(platform_get_drvdata(pdev));
      return 0;
}

static struct platform_driver wm8727_codec_driver = {
      .driver = {
                  .name = "wm8727-codec",
                  .owner = THIS_MODULE,
      },

      .probe = wm8727_platform_probe,
      .remove = __devexit_p(wm8727_platform_remove),
};

static int __init wm8727_init(void)
{
      return platform_driver_register(&wm8727_codec_driver);
}
module_init(wm8727_init);

static void __exit wm8727_exit(void)
{
      platform_driver_unregister(&wm8727_codec_driver);
}
module_exit(wm8727_exit);

MODULE_DESCRIPTION("ASoC wm8727 driver");
MODULE_AUTHOR("Neil Jones");
MODULE_LICENSE("GPL");

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