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 #define AC97_VERSION "0.6"
  26
  27 static int ac97_prepare(struct snd_pcm_substream *substream,
  28                         struct snd_soc_dai *dai)
  29 {
  30         struct snd_pcm_runtime *runtime = substream->runtime;
  31         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  32         struct snd_soc_codec *codec = rtd->codec;
  33
  34         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  35                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  36         return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
  37 }
  38
  39 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
  40                 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
  41                 SNDRV_PCM_RATE_48000)
  42
  43 static struct snd_soc_dai_ops ac97_dai_ops = {
  44         .prepare        = ac97_prepare,
  45 };
  46
  47 static struct snd_soc_dai_driver ac97_dai = {
  48         .name = "ac97-hifi",
  49         .ac97_control = 1,
  50         .playback = {
  51                 .stream_name = "AC97 Playback",
  52                 .channels_min = 1,
  53                 .channels_max = 2,
  54                 .rates = STD_AC97_RATES,
  55                 .formats = SND_SOC_STD_AC97_FMTS,},
  56         .capture = {
  57                 .stream_name = "AC97 Capture",
  58                 .channels_min = 1,
  59                 .channels_max = 2,
  60                 .rates = STD_AC97_RATES,
  61                 .formats = SND_SOC_STD_AC97_FMTS,},
  62         .ops = &ac97_dai_ops,
  63 };
  64
  65 static unsigned int ac97_read(struct snd_soc_codec *codec,
  66         unsigned int reg)
  67 {
  68         return soc_ac97_ops.read(codec->ac97, reg);
  69 }
  70
  71 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
  72         unsigned int val)
  73 {
  74         soc_ac97_ops.write(codec->ac97, reg, val);
  75         return 0;
  76 }
  77
  78 static int ac97_soc_probe(struct snd_soc_codec *codec)
  79 {
  80         struct snd_ac97_bus *ac97_bus;
  81         struct snd_ac97_template ac97_template;
  82         int ret;
  83
  84         printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
  85
  86         ret = snd_soc_new_ac97_codec(codec, &soc_ac97_ops, 0);
  87         if (ret < 0) {
  88                 printk(KERN_ERR "ASoC: failed to init gen ac97 glue\n");
  89                 return ret;
  90         }
  91
  92         /* add codec as bus device for standard ac97 */
  93         ret = snd_ac97_bus(codec->card->snd_card, 0, &soc_ac97_ops, NULL, &ac97_bus);
  94         if (ret < 0)
  95                 return ret;
  96
  97         memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
  98         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
  99         if (ret < 0)
 100                 return ret;
 101
 102         return 0;
 103 }
 104
 105 static int ac97_soc_remove(struct snd_soc_codec *codec)
 106 {
 107         return 0;
 108 }
 109
 110 #ifdef CONFIG_PM
 111 static int ac97_soc_suspend(struct snd_soc_codec *codec, pm_message_t msg)
 112 {
 113         snd_ac97_suspend(codec->ac97);
 114
 115         return 0;
 116 }
 117
 118 static int ac97_soc_resume(struct snd_soc_codec *codec)
 119 {
 120         snd_ac97_resume(codec->ac97);
 121
 122         return 0;
 123 }
 124 #else
 125 #define ac97_soc_suspend NULL
 126 #define ac97_soc_resume NULL
 127 #endif
 128
 129 static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
 130         .write = ac97_write,
 131         .read = ac97_read,
 132         .probe =        ac97_soc_probe,
 133         .remove =       ac97_soc_remove,
 134         .suspend =      ac97_soc_suspend,
 135         .resume =       ac97_soc_resume,
 136 };
 137
 138 static __devinit int ac97_probe(struct platform_device *pdev)
 139 {
 140         return snd_soc_register_codec(&pdev->dev,
 141                         &soc_codec_dev_ac97, &ac97_dai, 1);
 142 }
 143
 144 static int __devexit ac97_remove(struct platform_device *pdev)
 145 {
 146         snd_soc_unregister_codec(&pdev->dev);
 147         return 0;
 148 }
 149
 150 static struct platform_driver ac97_codec_driver = {
 151         .driver = {
 152                         .name = "ac97-codec",
 153                         .owner = THIS_MODULE,
 154         },
 155
 156         .probe = ac97_probe,
 157         .remove = __devexit_p(ac97_remove),
 158 };
 159
 160 static int __init ac97_init(void)
 161 {
 162         return platform_driver_register(&ac97_codec_driver);
 163 }
 164 module_init(ac97_init);
 165
 166 static void __exit ac97_exit(void)
 167 {
 168         platform_driver_unregister(&ac97_codec_driver);
 169 }
 170 module_exit(ac97_exit);
 171
 172 MODULE_DESCRIPTION("Soc Generic AC97 driver");
 173 MODULE_AUTHOR("Liam Girdwood");
 174 MODULE_LICENSE("GPL");