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 <linux/module.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 static int ac97_prepare(struct snd_pcm_substream *substream,
  27                         struct snd_soc_dai *dai)
  28 {
  29         struct snd_soc_codec *codec = dai->codec;
  30
  31         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  32                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  33         return snd_ac97_set_rate(codec->ac97, reg, substream->runtime->rate);
  34 }
  35
  36 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
  37                 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
  38                 SNDRV_PCM_RATE_48000)
  39
  40 static const struct snd_soc_dai_ops ac97_dai_ops = {
  41         .prepare        = ac97_prepare,
  42 };
  43
  44 static struct snd_soc_dai_driver ac97_dai = {
  45         .name = "ac97-hifi",
  46         .ac97_control = 1,
  47         .playback = {
  48                 .stream_name = "AC97 Playback",
  49                 .channels_min = 1,
  50                 .channels_max = 2,
  51                 .rates = STD_AC97_RATES,
  52                 .formats = SND_SOC_STD_AC97_FMTS,},
  53         .capture = {
  54                 .stream_name = "AC97 Capture",
  55                 .channels_min = 1,
  56                 .channels_max = 2,
  57                 .rates = STD_AC97_RATES,
  58                 .formats = SND_SOC_STD_AC97_FMTS,},
  59         .ops = &ac97_dai_ops,
  60 };
  61
  62 static unsigned int ac97_read(struct snd_soc_codec *codec,
  63         unsigned int reg)
  64 {
  65         return soc_ac97_ops->read(codec->ac97, reg);
  66 }
  67
  68 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
  69         unsigned int val)
  70 {
  71         soc_ac97_ops->write(codec->ac97, reg, val);
  72         return 0;
  73 }
  74
  75 static int ac97_soc_probe(struct snd_soc_codec *codec)
  76 {
  77         struct snd_ac97_bus *ac97_bus;
  78         struct snd_ac97_template ac97_template;
  79         int ret;
  80
  81         /* add codec as bus device for standard ac97 */
  82         ret = snd_ac97_bus(codec->card->snd_card, 0, soc_ac97_ops, NULL,
  83                            &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 #ifdef CONFIG_PM
  96 static int ac97_soc_suspend(struct snd_soc_codec *codec)
  97 {
  98         snd_ac97_suspend(codec->ac97);
  99
 100         return 0;
 101 }
 102
 103 static int ac97_soc_resume(struct snd_soc_codec *codec)
 104 {
 105         snd_ac97_resume(codec->ac97);
 106
 107         return 0;
 108 }
 109 #else
 110 #define ac97_soc_suspend NULL
 111 #define ac97_soc_resume NULL
 112 #endif
 113
 114 static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
 115         .write =        ac97_write,
 116         .read =         ac97_read,
 117         .probe =        ac97_soc_probe,
 118         .suspend =      ac97_soc_suspend,
 119         .resume =       ac97_soc_resume,
 120 };
 121
 122 static int ac97_probe(struct platform_device *pdev)
 123 {
 124         return snd_soc_register_codec(&pdev->dev,
 125                         &soc_codec_dev_ac97, &ac97_dai, 1);
 126 }
 127
 128 static int ac97_remove(struct platform_device *pdev)
 129 {
 130         snd_soc_unregister_codec(&pdev->dev);
 131         return 0;
 132 }
 133
 134 static struct platform_driver ac97_codec_driver = {
 135         .driver = {
 136                 .name = "ac97-codec",
 137                 .owner = THIS_MODULE,
 138         },
 139
 140         .probe = ac97_probe,
 141         .remove = ac97_remove,
 142 };
 143
 144 module_platform_driver(ac97_codec_driver);
 145
 146 MODULE_DESCRIPTION("Soc Generic AC97 driver");
 147 MODULE_AUTHOR("Liam Girdwood");
 148 MODULE_LICENSE("GPL");
 149 MODULE_ALIAS("platform:ac97-codec");