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  * Generic AC97 support.
  14  */
  15
  16 #include <linux/init.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 {
  29         struct snd_pcm_runtime *runtime = substream->runtime;
  30         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  31         struct snd_soc_device *socdev = rtd->socdev;
  32         struct snd_soc_codec *codec = socdev->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 struct snd_soc_codec_dai ac97_dai = {
  44         .name = "AC97 HiFi",
  45         .type = SND_SOC_DAI_AC97,
  46         .playback = {
  47                 .stream_name = "AC97 Playback",
  48                 .channels_min = 1,
  49                 .channels_max = 2,
  50                 .rates = STD_AC97_RATES,
  51                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
  52         .capture = {
  53                 .stream_name = "AC97 Capture",
  54                 .channels_min = 1,
  55                 .channels_max = 2,
  56                 .rates = STD_AC97_RATES,
  57                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
  58         .ops = {
  59                 .prepare = ac97_prepare,},
  60 };
  61 EXPORT_SYMBOL_GPL(ac97_dai);
  62
  63 static unsigned int ac97_read(struct snd_soc_codec *codec,
  64         unsigned int reg)
  65 {
  66         return soc_ac97_ops.read(codec->ac97, reg);
  67 }
  68
  69 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
  70         unsigned int val)
  71 {
  72         soc_ac97_ops.write(codec->ac97, reg, val);
  73         return 0;
  74 }
  75
  76 static int ac97_soc_probe(struct platform_device *pdev)
  77 {
  78         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
  79         struct snd_soc_codec *codec;
  80         struct snd_ac97_bus *ac97_bus;
  81         struct snd_ac97_template ac97_template;
  82         int ret = 0;
  83
  84         printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
  85
  86         socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
  87         if (!socdev->codec)
  88                 return -ENOMEM;
  89         codec = socdev->codec;
  90         mutex_init(&codec->mutex);
  91
  92         codec->name = "AC97";
  93         codec->owner = THIS_MODULE;
  94         codec->dai = &ac97_dai;
  95         codec->num_dai = 1;
  96         codec->write = ac97_write;
  97         codec->read = ac97_read;
  98         INIT_LIST_HEAD(&codec->dapm_widgets);
  99         INIT_LIST_HEAD(&codec->dapm_paths);
 100
 101         /* register pcms */
 102         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 103         if (ret < 0)
 104                 goto err;
 105
 106         /* add codec as bus device for standard ac97 */
 107         ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
 108         if (ret < 0)
 109                 goto bus_err;
 110
 111         memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
 112         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
 113         if (ret < 0)
 114                 goto bus_err;
 115
 116         ret = snd_soc_register_card(socdev);
 117         if (ret < 0)
 118                 goto bus_err;
 119         return 0;
 120
 121 bus_err:
 122         snd_soc_free_pcms(socdev);
 123
 124 err:
 125         kfree(socdev->codec->reg_cache);
 126         kfree(socdev->codec);
 127         socdev->codec = NULL;
 128         return ret;
 129 }
 130
 131 static int ac97_soc_remove(struct platform_device *pdev)
 132 {
 133         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 134         struct snd_soc_codec *codec = socdev->codec;
 135
 136         if (!codec)
 137                 return 0;
 138
 139         snd_soc_free_pcms(socdev);
 140         kfree(socdev->codec->reg_cache);
 141         kfree(socdev->codec);
 142
 143         return 0;
 144 }
 145
 146 struct snd_soc_codec_device soc_codec_dev_ac97 = {
 147         .probe =        ac97_soc_probe,
 148         .remove =       ac97_soc_remove,
 149 };
 150 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
 151
 152 MODULE_DESCRIPTION("Soc Generic AC97 driver");
 153 MODULE_AUTHOR("Liam Girdwood");
 154 MODULE_LICENSE("GPL");