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 |\
  44                 SNDRV_PCM_RATE_48000)
  45
  46 struct snd_soc_codec_dai ac97_dai = {
  47         .name = "AC97 HiFi",
  48         .type = SND_SOC_DAI_AC97,
  49         .playback = {
  50                 .stream_name = "AC97 Playback",
  51                 .channels_min = 1,
  52                 .channels_max = 2,
  53                 .rates = STD_AC97_RATES,
  54                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
  55         .capture = {
  56                 .stream_name = "AC97 Capture",
  57                 .channels_min = 1,
  58                 .channels_max = 2,
  59                 .rates = STD_AC97_RATES,
  60                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
  61         .ops = {
  62                 .prepare = ac97_prepare,},
  63 };
  64 EXPORT_SYMBOL_GPL(ac97_dai);
  65
  66 static unsigned int ac97_read(struct snd_soc_codec *codec,
  67         unsigned int reg)
  68 {
  69         return soc_ac97_ops.read(codec->ac97, reg);
  70 }
  71
  72 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
  73         unsigned int val)
  74 {
  75         soc_ac97_ops.write(codec->ac97, reg, val);
  76         return 0;
  77 }
  78
  79 static int ac97_soc_probe(struct platform_device *pdev)
  80 {
  81         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
  82         struct snd_soc_codec *codec;
  83         struct snd_ac97_bus *ac97_bus;
  84         struct snd_ac97_template ac97_template;
  85         int ret = 0;
  86
  87         printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
  88
  89         socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
  90         if (!socdev->codec)
  91                 return -ENOMEM;
  92         codec = socdev->codec;
  93         mutex_init(&codec->mutex);
  94
  95         codec->name = "AC97";
  96         codec->owner = THIS_MODULE;
  97         codec->dai = &ac97_dai;
  98         codec->num_dai = 1;
  99         codec->write = ac97_write;
 100         codec->read = ac97_read;
 101         INIT_LIST_HEAD(&codec->dapm_widgets);
 102         INIT_LIST_HEAD(&codec->dapm_paths);
 103
 104         /* register pcms */
 105         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 106         if (ret < 0)
 107                 goto err;
 108
 109         /* add codec as bus device for standard ac97 */
 110         ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
 111         if (ret < 0)
 112                 goto bus_err;
 113
 114         memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
 115         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
 116         if (ret < 0)
 117                 goto bus_err;
 118
 119         ret = snd_soc_register_card(socdev);
 120         if (ret < 0)
 121                 goto bus_err;
 122         return 0;
 123
 124 bus_err:
 125         snd_soc_free_pcms(socdev);
 126
 127 err:
 128         kfree(socdev->codec->reg_cache);
 129         kfree(socdev->codec);
 130         socdev->codec = NULL;
 131         return ret;
 132 }
 133
 134 static int ac97_soc_remove(struct platform_device *pdev)
 135 {
 136         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 137         struct snd_soc_codec *codec = socdev->codec;
 138
 139         if (!codec)
 140                 return 0;
 141
 142         snd_soc_free_pcms(socdev);
 143         kfree(socdev->codec->reg_cache);
 144         kfree(socdev->codec);
 145
 146         return 0;
 147 }
 148
 149 struct snd_soc_codec_device soc_codec_dev_ac97 = {
 150         .probe =        ac97_soc_probe,
 151         .remove =       ac97_soc_remove,
 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");