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_pcm_runtime *runtime = substream->runtime;
  30         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  31         struct snd_soc_codec *codec = rtd->codec;
  32
  33         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  34                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  35         return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
  36 }
  37
  38 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
  39                 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
  40                 SNDRV_PCM_RATE_48000)
  41
  42 static struct snd_soc_dai_ops ac97_dai_ops = {
  43         .prepare        = ac97_prepare,
  44 };
  45
  46 static struct snd_soc_dai_driver ac97_dai = {
  47         .name = "ac97-hifi",
  48         .ac97_control = 1,
  49         .playback = {
  50                 .stream_name = "AC97 Playback",
  51                 .channels_min = 1,
  52                 .channels_max = 2,
  53                 .rates = STD_AC97_RATES,
  54                 .formats = SND_SOC_STD_AC97_FMTS,},
  55         .capture = {
  56                 .stream_name = "AC97 Capture",
  57                 .channels_min = 1,
  58                 .channels_max = 2,
  59                 .rates = STD_AC97_RATES,
  60                 .formats = SND_SOC_STD_AC97_FMTS,},
  61         .ops = &ac97_dai_ops,
  62 };
  63
  64 static unsigned int ac97_read(struct snd_soc_codec *codec,
  65         unsigned int reg)
  66 {
  67         return soc_ac97_ops.read(codec->ac97, reg);
  68 }
  69
  70 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
  71         unsigned int val)
  72 {
  73         soc_ac97_ops.write(codec->ac97, reg, val);
  74         return 0;
  75 }
  76
  77 static int ac97_soc_probe(struct snd_soc_codec *codec)
  78 {
  79         struct snd_ac97_bus *ac97_bus;
  80         struct snd_ac97_template ac97_template;
  81         int ret;
  82
  83         /* add codec as bus device for standard ac97 */
  84         ret = snd_ac97_bus(codec->card->snd_card, 0, &soc_ac97_ops, NULL, &ac97_bus);
  85         if (ret < 0)
  86                 return ret;
  87
  88         memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
  89         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
  90         if (ret < 0)
  91                 return ret;
  92
  93         return 0;
  94 }
  95
  96 static int ac97_soc_remove(struct snd_soc_codec *codec)
  97 {
  98         return 0;
  99 }
 100
 101 #ifdef CONFIG_PM
 102 static int ac97_soc_suspend(struct snd_soc_codec *codec, pm_message_t msg)
 103 {
 104         snd_ac97_suspend(codec->ac97);
 105
 106         return 0;
 107 }
 108
 109 static int ac97_soc_resume(struct snd_soc_codec *codec)
 110 {
 111         snd_ac97_resume(codec->ac97);
 112
 113         return 0;
 114 }
 115 #else
 116 #define ac97_soc_suspend NULL
 117 #define ac97_soc_resume NULL
 118 #endif
 119
 120 static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
 121         .write =        ac97_write,
 122         .read =         ac97_read,
 123         .probe =        ac97_soc_probe,
 124         .remove =       ac97_soc_remove,
 125         .suspend =      ac97_soc_suspend,
 126         .resume =       ac97_soc_resume,
 127 };
 128
 129 static __devinit int ac97_probe(struct platform_device *pdev)
 130 {
 131         return snd_soc_register_codec(&pdev->dev,
 132                         &soc_codec_dev_ac97, &ac97_dai, 1);
 133 }
 134
 135 static int __devexit ac97_remove(struct platform_device *pdev)
 136 {
 137         snd_soc_unregister_codec(&pdev->dev);
 138         return 0;
 139 }
 140
 141 static struct platform_driver ac97_codec_driver = {
 142         .driver = {
 143                 .name = "ac97-codec",
 144                 .owner = THIS_MODULE,
 145         },
 146
 147         .probe = ac97_probe,
 148         .remove = __devexit_p(ac97_remove),
 149 };
 150
 151 static int __init ac97_init(void)
 152 {
 153         return platform_driver_register(&ac97_codec_driver);
 154 }
 155 module_init(ac97_init);
 156
 157 static void __exit ac97_exit(void)
 158 {
 159         platform_driver_unregister(&ac97_codec_driver);
 160 }
 161 module_exit(ac97_exit);
 162
 163 MODULE_DESCRIPTION("Soc Generic AC97 driver");
 164 MODULE_AUTHOR("Liam Girdwood");
 165 MODULE_LICENSE("GPL");
 166 MODULE_ALIAS("platform:ac97-codec");