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         struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec);
  41
  42         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  43                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  44         return snd_ac97_set_rate(ac97, reg, substream->runtime->rate);
  45 }
  46
  47 static const struct snd_soc_dai_ops ac97_dai_ops = {
  48         .prepare        = ac97_prepare,
  49 };
  50
  51 static struct snd_soc_dai_driver ac97_dai = {
  52         .name = "ac97-hifi",
  53         .playback = {
  54                 .stream_name = "AC97 Playback",
  55                 .channels_min = 1,
  56                 .channels_max = 2,
  57                 .rates = SNDRV_PCM_RATE_KNOT,
  58                 .formats = SND_SOC_STD_AC97_FMTS,},
  59         .capture = {
  60                 .stream_name = "AC97 Capture",
  61                 .channels_min = 1,
  62                 .channels_max = 2,
  63                 .rates = SNDRV_PCM_RATE_KNOT,
  64                 .formats = SND_SOC_STD_AC97_FMTS,},
  65         .ops = &ac97_dai_ops,
  66 };
  67
  68 static int ac97_soc_probe(struct snd_soc_codec *codec)
  69 {
  70         struct snd_ac97 *ac97;
  71         struct snd_ac97_bus *ac97_bus;
  72         struct snd_ac97_template ac97_template;
  73         int ret;
  74
  75         /* add codec as bus device for standard ac97 */
  76         ret = snd_ac97_bus(codec->component.card->snd_card, 0, soc_ac97_ops,
  77                            NULL, &ac97_bus);
  78         if (ret < 0)
  79                 return ret;
  80
  81         memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
  82         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
  83         if (ret < 0)
  84                 return ret;
  85
  86         snd_soc_codec_set_drvdata(codec, ac97);
  87
  88         return 0;
  89 }
  90
  91 #ifdef CONFIG_PM
  92 static int ac97_soc_suspend(struct snd_soc_codec *codec)
  93 {
  94         struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec);
  95
  96         snd_ac97_suspend(ac97);
  97
  98         return 0;
  99 }
 100
 101 static int ac97_soc_resume(struct snd_soc_codec *codec)
 102 {
 103
 104         struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec);
 105
 106         snd_ac97_resume(ac97);
 107
 108         return 0;
 109 }
 110 #else
 111 #define ac97_soc_suspend NULL
 112 #define ac97_soc_resume NULL
 113 #endif
 114
 115 static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
 116         .probe =        ac97_soc_probe,
 117         .suspend =      ac97_soc_suspend,
 118         .resume =       ac97_soc_resume,
 119
 120         .dapm_widgets = ac97_widgets,
 121         .num_dapm_widgets = ARRAY_SIZE(ac97_widgets),
 122         .dapm_routes = ac97_routes,
 123         .num_dapm_routes = ARRAY_SIZE(ac97_routes),
 124 };
 125
 126 static int ac97_probe(struct platform_device *pdev)
 127 {
 128         return snd_soc_register_codec(&pdev->dev,
 129                         &soc_codec_dev_ac97, &ac97_dai, 1);
 130 }
 131
 132 static int ac97_remove(struct platform_device *pdev)
 133 {
 134         snd_soc_unregister_codec(&pdev->dev);
 135         return 0;
 136 }
 137
 138 static struct platform_driver ac97_codec_driver = {
 139         .driver = {
 140                 .name = "ac97-codec",
 141         },
 142
 143         .probe = ac97_probe,
 144         .remove = ac97_remove,
 145 };
 146
 147 module_platform_driver(ac97_codec_driver);
 148
 149 MODULE_DESCRIPTION("Soc Generic AC97 driver");
 150 MODULE_AUTHOR("Liam Girdwood");
 151 MODULE_LICENSE("GPL");
 152 MODULE_ALIAS("platform:ac97-codec");