sound/soc/codecs/ac97.c

   1 /*
   2  * ac97.c  --  ALSA Soc AC97 codec support
   3  *
   4  * Copyright 2005 Wolfson Microelectronics PLC.
   5  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   6  *
   7  *  This program is free software; you can redistribute  it and/or modify it
   8  *  under  the terms of  the GNU General  Public License as published by the
   9  *  Free Software Foundation;  either version 2 of the  License, or (at your
  10  *  option) any later version.
  11  *
  12  * Generic AC97 support.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/slab.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 static int ac97_prepare(struct snd_pcm_substream *substream,
  26                         struct snd_soc_dai *dai)
  27 {
  28         struct snd_pcm_runtime *runtime = substream->runtime;
  29         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  30         struct snd_soc_codec *codec = rtd->codec;
  31
  32         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  33                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  34         return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
  35 }
  36
  37 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
  38                 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
  39                 SNDRV_PCM_RATE_48000)
  40
  41 static struct snd_soc_dai_ops ac97_dai_ops = {
  42         .prepare        = ac97_prepare,
  43 };
  44
  45 static struct snd_soc_dai_driver ac97_dai = {
  46         .name = "ac97-hifi",
  47         .ac97_control = 1,
  48         .playback = {
  49                 .stream_name = "AC97 Playback",
  50                 .channels_min = 1,
  51                 .channels_max = 2,
  52                 .rates = STD_AC97_RATES,
  53                 .formats = SND_SOC_STD_AC97_FMTS,},
  54         .capture = {
  55                 .stream_name = "AC97 Capture",
  56                 .channels_min = 1,
  57                 .channels_max = 2,
  58                 .rates = STD_AC97_RATES,
  59                 .formats = SND_SOC_STD_AC97_FMTS,},
  60         .ops = &ac97_dai_ops,
  61 };
  62
  63 static unsigned int ac97_read(struct snd_soc_codec *codec,
  64         unsigned int reg)
  65 {
  66         return soc_ac97_ops.read(codec->ac97, reg);
  67 }
  68
  69 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
  70         unsigned int val)
  71 {
  72         soc_ac97_ops.write(codec->ac97, reg, val);
  73         return 0;
  74 }
  75
  76 static int ac97_soc_probe(struct snd_soc_codec *codec)
  77 {
  78         struct snd_ac97_bus *ac97_bus;
  79         struct snd_ac97_template ac97_template;
  80         int ret;
  81
  82         /* add codec as bus device for standard ac97 */
  83         ret = snd_ac97_bus(codec->card->snd_card, 0, &soc_ac97_ops, NULL, &ac97_bus);
  84         if (ret < 0)
  85                 return ret;
  86
  87         memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
  88         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
  89         if (ret < 0)
  90                 return ret;
  91
  92         return 0;
  93 }
  94
  95 static int ac97_soc_remove(struct snd_soc_codec *codec)
  96 {
  97         return 0;
  98 }
  99
 100 #ifdef CONFIG_PM
 101 static int ac97_soc_suspend(struct snd_soc_codec *codec, pm_message_t msg)
 102 {
 103         snd_ac97_suspend(codec->ac97);
 104
 105         return 0;
 106 }
 107
 108 static int ac97_soc_resume(struct snd_soc_codec *codec)
 109 {
 110         snd_ac97_resume(codec->ac97);
 111
 112         return 0;
 113 }
 114 #else
 115 #define ac97_soc_suspend NULL
 116 #define ac97_soc_resume NULL
 117 #endif
 118
 119 static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
 120         .write =        ac97_write,
 121         .read =         ac97_read,
 122         .probe =        ac97_soc_probe,
 123         .remove =       ac97_soc_remove,
 124         .suspend =      ac97_soc_suspend,
 125         .resume =       ac97_soc_resume,
 126 };
 127
 128 static __devinit int ac97_probe(struct platform_device *pdev)
 129 {
 130         return snd_soc_register_codec(&pdev->dev,
 131                         &soc_codec_dev_ac97, &ac97_dai, 1);
 132 }
 133
 134 static int __devexit ac97_remove(struct platform_device *pdev)
 135 {
 136         snd_soc_unregister_codec(&pdev->dev);
 137         return 0;
 138 }
 139
 140 static struct platform_driver ac97_codec_driver = {
 141         .driver = {
 142                 .name = "ac97-codec",
 143                 .owner = THIS_MODULE,
 144         },
 145
 146         .probe = ac97_probe,
 147         .remove = __devexit_p(ac97_remove),
 148 };
 149
 150 static int __init ac97_init(void)
 151 {
 152         return platform_driver_register(&ac97_codec_driver);
 153 }
 154 module_init(ac97_init);
 155
 156 static void __exit ac97_exit(void)
 157 {
 158         platform_driver_unregister(&ac97_codec_driver);
 159 }
 160 module_exit(ac97_exit);
 161
 162 MODULE_DESCRIPTION("Soc Generic AC97 driver");
 163 MODULE_AUTHOR("Liam Girdwood");
 164 MODULE_LICENSE("GPL");
 165 MODULE_ALIAS("platform:ac97-codec");