sound/soc/codecs/wm8727.c

   1 /*
   2  * wm8727.c
   3  *
   4  *  Created on: 15-Oct-2009
   5  *      Author: neil.jones@imgtec.com
   6  *
   7  * Copyright (C) 2009 Imagination Technologies Ltd.
   8  *
   9  *  This program is free software; you can redistribute  it and/or modify it
  10  *  under  the terms of  the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the  License, or (at your
  12  *  option) any later version.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/device.h>
  19 #include <sound/core.h>
  20 #include <sound/pcm.h>
  21 #include <sound/ac97_codec.h>
  22 #include <sound/initval.h>
  23 #include <sound/soc.h>
  24
  25 #include "wm8727.h"
  26 /*
  27  * Note this is a simple chip with no configuration interface, sample rate is
  28  * determined automatically by examining the Master clock and Bit clock ratios
  29  */
  30 #define WM8727_RATES  (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
  31                         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 |\
  32                         SNDRV_PCM_RATE_192000)
  33
  34
  35 struct snd_soc_dai wm8727_dai = {
  36         .name = "WM8727",
  37         .playback = {
  38                 .stream_name = "Playback",
  39                 .channels_min = 2,
  40                 .channels_max = 2,
  41                 .rates = WM8727_RATES,
  42                 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
  43                 },
  44 };
  45 EXPORT_SYMBOL_GPL(wm8727_dai);
  46
  47 static struct snd_soc_codec *wm8727_codec;
  48
  49 static int wm8727_soc_probe(struct platform_device *pdev)
  50 {
  51         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
  52         int ret = 0;
  53
  54         BUG_ON(!wm8727_codec);
  55
  56         socdev->card->codec = wm8727_codec;
  57
  58         /* register pcms */
  59         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
  60         if (ret < 0) {
  61                 printk(KERN_ERR "wm8727: failed to create pcms\n");
  62                 goto pcm_err;
  63         }
  64
  65         return ret;
  66
  67 pcm_err:
  68         kfree(socdev->card->codec);
  69         socdev->card->codec = NULL;
  70         return ret;
  71 }
  72
  73 static int wm8727_soc_remove(struct platform_device *pdev)
  74 {
  75         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
  76
  77         snd_soc_free_pcms(socdev);
  78
  79         return 0;
  80 }
  81
  82 struct snd_soc_codec_device soc_codec_dev_wm8727 = {
  83         .probe =        wm8727_soc_probe,
  84         .remove =       wm8727_soc_remove,
  85 };
  86 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8727);
  87
  88
  89 static __devinit int wm8727_platform_probe(struct platform_device *pdev)
  90 {
  91         struct snd_soc_codec *codec;
  92         int ret;
  93
  94         if (wm8727_codec) {
  95                 dev_err(&pdev->dev, "Another WM8727 is registered\n");
  96                 return -EBUSY;
  97         }
  98
  99         codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
 100         if (codec == NULL)
 101                 return -ENOMEM;
 102         wm8727_codec = codec;
 103
 104         platform_set_drvdata(pdev, codec);
 105
 106         mutex_init(&codec->mutex);
 107         codec->dev = &pdev->dev;
 108         codec->name = "WM8727";
 109         codec->owner = THIS_MODULE;
 110         codec->dai = &wm8727_dai;
 111         codec->num_dai = 1;
 112         INIT_LIST_HEAD(&codec->dapm_widgets);
 113         INIT_LIST_HEAD(&codec->dapm_paths);
 114
 115         wm8727_dai.dev = &pdev->dev;
 116
 117         ret = snd_soc_register_codec(codec);
 118         if (ret != 0) {
 119                 dev_err(&pdev->dev, "Failed to register CODEC: %d\n", ret);
 120                 goto err;
 121         }
 122
 123         ret = snd_soc_register_dai(&wm8727_dai);
 124         if (ret != 0) {
 125                 dev_err(&pdev->dev, "Failed to register DAI: %d\n", ret);
 126                 goto err_codec;
 127         }
 128
 129 err_codec:
 130         snd_soc_unregister_codec(codec);
 131 err:
 132         kfree(codec);
 133         return ret;
 134 }
 135
 136 static int __devexit wm8727_platform_remove(struct platform_device *pdev)
 137 {
 138         snd_soc_unregister_dai(&wm8727_dai);
 139         snd_soc_unregister_codec(platform_get_drvdata(pdev));
 140         return 0;
 141 }
 142
 143 static struct platform_driver wm8727_codec_driver = {
 144         .driver = {
 145                         .name = "wm8727-codec",
 146                         .owner = THIS_MODULE,
 147         },
 148
 149         .probe = wm8727_platform_probe,
 150         .remove = __devexit_p(wm8727_platform_remove),
 151 };
 152
 153 static int __init wm8727_init(void)
 154 {
 155         return platform_driver_register(&wm8727_codec_driver);
 156 }
 157 module_init(wm8727_init);
 158
 159 static void __exit wm8727_exit(void)
 160 {
 161         platform_driver_unregister(&wm8727_codec_driver);
 162 }
 163 module_exit(wm8727_exit);
 164
 165 MODULE_DESCRIPTION("ASoC wm8727 driver");
 166 MODULE_AUTHOR("Neil Jones");
 167 MODULE_LICENSE("GPL");