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
   6  *         liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  *  Revision history
  14  *    17th Oct 2005   Initial version.
  15  *
  16  * Generic AC97 support.
  17  */
  18
  19 #include <linux/init.h>
  20 #include <linux/kernel.h>
  21 #include <linux/device.h>
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/ac97_codec.h>
  25 #include <sound/initval.h>
  26 #include <sound/soc.h>
  27
  28 #define AC97_VERSION "0.6"
  29
  30 static int ac97_prepare(struct snd_pcm_substream *substream)
  31 {
  32         struct snd_pcm_runtime *runtime = substream->runtime;
  33         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  34         struct snd_soc_device *socdev = rtd->socdev;
  35         struct snd_soc_codec *codec = socdev->codec;
  36
  37         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  38                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  39         return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
  40 }
  41
  42 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
  43                 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)
  44
  45 struct snd_soc_codec_dai ac97_dai = {
  46         .name = "AC97 HiFi",
  47         .type = SND_SOC_DAI_AC97,
  48         .playback = {
  49                 .stream_name = "AC97 Playback",
  50                 .channels_min = 1,
  51                 .channels_max = 2,
  52                 .rates = STD_AC97_RATES,
  53                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
  54         .capture = {
  55                 .stream_name = "AC97 Capture",
  56                 .channels_min = 1,
  57                 .channels_max = 2,
  58                 .rates = STD_AC97_RATES,
  59                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
  60         .ops = {
  61                 .prepare = ac97_prepare,},
  62 };
  63 EXPORT_SYMBOL_GPL(ac97_dai);
  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 platform_device *pdev)
  79 {
  80         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
  81         struct snd_soc_codec *codec;
  82         struct snd_ac97_bus *ac97_bus;
  83         struct snd_ac97_template ac97_template;
  84         int ret = 0;
  85
  86         printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
  87
  88         socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
  89         if (socdev->codec == NULL)
  90                 return -ENOMEM;
  91         codec = socdev->codec;
  92         mutex_init(&codec->mutex);
  93
  94         codec->name = "AC97";
  95         codec->owner = THIS_MODULE;
  96         codec->dai = &ac97_dai;
  97         codec->num_dai = 1;
  98         codec->write = ac97_write;
  99         codec->read = ac97_read;
 100         INIT_LIST_HEAD(&codec->dapm_widgets);
 101         INIT_LIST_HEAD(&codec->dapm_paths);
 102
 103         /* register pcms */
 104         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 105         if(ret < 0)
 106                 goto err;
 107
 108         /* add codec as bus device for standard ac97 */
 109         ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
 110         if(ret < 0)
 111                 goto bus_err;
 112
 113         memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
 114         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
 115         if(ret < 0)
 116                 goto bus_err;
 117
 118         ret = snd_soc_register_card(socdev);
 119         if (ret < 0)
 120                 goto bus_err;
 121         return 0;
 122
 123 bus_err:
 124         snd_soc_free_pcms(socdev);
 125
 126 err:
 127         kfree(socdev->codec->reg_cache);
 128         kfree(socdev->codec);
 129         socdev->codec = NULL;
 130         return ret;
 131 }
 132
 133 static int ac97_soc_remove(struct platform_device *pdev)
 134 {
 135         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 136         struct snd_soc_codec *codec = socdev->codec;
 137
 138         if(codec == NULL)
 139                 return 0;
 140
 141         snd_soc_free_pcms(socdev);
 142         kfree(socdev->codec->reg_cache);
 143         kfree(socdev->codec);
 144
 145         return 0;
 146 }
 147
 148 struct snd_soc_codec_device soc_codec_dev_ac97= {
 149         .probe =        ac97_soc_probe,
 150         .remove =       ac97_soc_remove,
 151 };
 152
 153 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
 154
 155 MODULE_DESCRIPTION("Soc Generic AC97 driver");
 156 MODULE_AUTHOR("Liam Girdwood");
 157 MODULE_LICENSE("GPL");