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