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 const struct snd_soc_dapm_widget ac97_widgets[] = {
  27         SND_SOC_DAPM_INPUT("RX"),
  28         SND_SOC_DAPM_OUTPUT("TX"),
  29 };
  30
  31 static const struct snd_soc_dapm_route ac97_routes[] = {
  32         { "AC97 Capture", NULL, "RX" },
  33         { "TX", NULL, "AC97 Playback" },
  34 };
  35
  36 static int ac97_prepare(struct snd_pcm_substream *substream,
  37                         struct snd_soc_dai *dai)
  38 {
  39         struct snd_soc_codec *codec = dai->codec;
  40
  41         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  42                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  43         return snd_ac97_set_rate(codec->ac97, reg, substream->runtime->rate);
  44 }
  45
  46 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
  47                 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
  48                 SNDRV_PCM_RATE_48000)
  49
  50 static const struct snd_soc_dai_ops ac97_dai_ops = {
  51         .prepare        = ac97_prepare,
  52 };
  53
  54 static struct snd_soc_dai_driver ac97_dai = {
  55         .name = "ac97-hifi",
  56         .ac97_control = 1,
  57         .playback = {
  58                 .stream_name = "AC97 Playback",
  59                 .channels_min = 1,
  60                 .channels_max = 2,
  61                 .rates = STD_AC97_RATES,
  62                 .formats = SND_SOC_STD_AC97_FMTS,},
  63         .capture = {
  64                 .stream_name = "AC97 Capture",
  65                 .channels_min = 1,
  66                 .channels_max = 2,
  67                 .rates = STD_AC97_RATES,
  68                 .formats = SND_SOC_STD_AC97_FMTS,},
  69         .ops = &ac97_dai_ops,
  70 };
  71
  72 static unsigned int ac97_read(struct snd_soc_codec *codec,
  73         unsigned int reg)
  74 {
  75         return soc_ac97_ops->read(codec->ac97, reg);
  76 }
  77
  78 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
  79         unsigned int val)
  80 {
  81         soc_ac97_ops->write(codec->ac97, reg, val);
  82         return 0;
  83 }
  84
  85 static int ac97_soc_probe(struct snd_soc_codec *codec)
  86 {
  87         struct snd_ac97_bus *ac97_bus;
  88         struct snd_ac97_template ac97_template;
  89         int ret;
  90
  91         /* add codec as bus device for standard ac97 */
  92         ret = snd_ac97_bus(codec->card->snd_card, 0, soc_ac97_ops, NULL,
  93                            &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 #ifdef CONFIG_PM
 106 static int ac97_soc_suspend(struct snd_soc_codec *codec)
 107 {
 108         snd_ac97_suspend(codec->ac97);
 109
 110         return 0;
 111 }
 112
 113 static int ac97_soc_resume(struct snd_soc_codec *codec)
 114 {
 115         snd_ac97_resume(codec->ac97);
 116
 117         return 0;
 118 }
 119 #else
 120 #define ac97_soc_suspend NULL
 121 #define ac97_soc_resume NULL
 122 #endif
 123
 124 static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
 125         .write =        ac97_write,
 126         .read =         ac97_read,
 127         .probe =        ac97_soc_probe,
 128         .suspend =      ac97_soc_suspend,
 129         .resume =       ac97_soc_resume,
 130
 131         .dapm_widgets = ac97_widgets,
 132         .num_dapm_widgets = ARRAY_SIZE(ac97_widgets),
 133         .dapm_routes = ac97_routes,
 134         .num_dapm_routes = ARRAY_SIZE(ac97_routes),
 135 };
 136
 137 static int ac97_probe(struct platform_device *pdev)
 138 {
 139         return snd_soc_register_codec(&pdev->dev,
 140                         &soc_codec_dev_ac97, &ac97_dai, 1);
 141 }
 142
 143 static int ac97_remove(struct platform_device *pdev)
 144 {
 145         snd_soc_unregister_codec(&pdev->dev);
 146         return 0;
 147 }
 148
 149 static struct platform_driver ac97_codec_driver = {
 150         .driver = {
 151                 .name = "ac97-codec",
 152                 .owner = THIS_MODULE,
 153         },
 154
 155         .probe = ac97_probe,
 156         .remove = ac97_remove,
 157 };
 158
 159 module_platform_driver(ac97_codec_driver);
 160
 161 MODULE_DESCRIPTION("Soc Generic AC97 driver");
 162 MODULE_AUTHOR("Liam Girdwood");
 163 MODULE_LICENSE("GPL");
 164 MODULE_ALIAS("platform:ac97-codec");