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 #include "ac97.h"
  25
  26 #define AC97_VERSION "0.6"
  27
  28 static int ac97_prepare(struct snd_pcm_substream *substream)
  29 {
  30         struct snd_pcm_runtime *runtime = substream->runtime;
  31         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  32         struct snd_soc_device *socdev = rtd->socdev;
  33         struct snd_soc_codec *codec = socdev->codec;
  34
  35         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  36                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  37         return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
  38 }
  39
  40 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
  41                 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
  42                 SNDRV_PCM_RATE_48000)
  43
  44 struct snd_soc_dai ac97_dai = {
  45         .name = "AC97 HiFi",
  46         .type = SND_SOC_DAI_AC97,
  47         .playback = {
  48                 .stream_name = "AC97 Playback",
  49                 .channels_min = 1,
  50                 .channels_max = 2,
  51                 .rates = STD_AC97_RATES,
  52                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
  53         .capture = {
  54                 .stream_name = "AC97 Capture",
  55                 .channels_min = 1,
  56                 .channels_max = 2,
  57                 .rates = STD_AC97_RATES,
  58                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
  59         .ops = {
  60                 .prepare = ac97_prepare,},
  61 };
  62 EXPORT_SYMBOL_GPL(ac97_dai);
  63
  64 static unsigned int ac97_read(struct snd_soc_codec *codec,
  65         unsigned int reg)
  66 {
  67         return soc_ac97_ops.read(codec->ac97, reg);
  68 }
  69
  70 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
  71         unsigned int val)
  72 {
  73         soc_ac97_ops.write(codec->ac97, reg, val);
  74         return 0;
  75 }
  76
  77 static int ac97_soc_probe(struct platform_device *pdev)
  78 {
  79         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
  80         struct snd_soc_codec *codec;
  81         struct snd_ac97_bus *ac97_bus;
  82         struct snd_ac97_template ac97_template;
  83         int ret = 0;
  84
  85         printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
  86
  87         socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
  88         if (!socdev->codec)
  89                 return -ENOMEM;
  90         codec = socdev->codec;
  91         mutex_init(&codec->mutex);
  92
  93         codec->name = "AC97";
  94         codec->owner = THIS_MODULE;
  95         codec->dai = &ac97_dai;
  96         codec->num_dai = 1;
  97         codec->write = ac97_write;
  98         codec->read = ac97_read;
  99         INIT_LIST_HEAD(&codec->dapm_widgets);
 100         INIT_LIST_HEAD(&codec->dapm_paths);
 101
 102         /* register pcms */
 103         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 104         if (ret < 0)
 105                 goto err;
 106
 107         /* add codec as bus device for standard ac97 */
 108         ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
 109         if (ret < 0)
 110                 goto bus_err;
 111
 112         memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
 113         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
 114         if (ret < 0)
 115                 goto bus_err;
 116
 117         ret = snd_soc_register_card(socdev);
 118         if (ret < 0)
 119                 goto bus_err;
 120         return 0;
 121
 122 bus_err:
 123         snd_soc_free_pcms(socdev);
 124
 125 err:
 126         kfree(socdev->codec->reg_cache);
 127         kfree(socdev->codec);
 128         socdev->codec = NULL;
 129         return ret;
 130 }
 131
 132 static int ac97_soc_remove(struct platform_device *pdev)
 133 {
 134         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 135         struct snd_soc_codec *codec = socdev->codec;
 136
 137         if (!codec)
 138                 return 0;
 139
 140         snd_soc_free_pcms(socdev);
 141         kfree(socdev->codec->reg_cache);
 142         kfree(socdev->codec);
 143
 144         return 0;
 145 }
 146
 147 #ifdef CONFIG_PM
 148 static int ac97_soc_suspend(struct platform_device *pdev, pm_message_t msg)
 149 {
 150         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 151
 152         snd_ac97_suspend(socdev->codec->ac97);
 153
 154         return 0;
 155 }
 156
 157 static int ac97_soc_resume(struct platform_device *pdev)
 158 {
 159         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 160
 161         snd_ac97_resume(socdev->codec->ac97);
 162
 163         return 0;
 164 }
 165 #else
 166 #define ac97_soc_suspend NULL
 167 #define ac97_soc_resume NULL
 168 #endif
 169
 170 struct snd_soc_codec_device soc_codec_dev_ac97 = {
 171         .probe =        ac97_soc_probe,
 172         .remove =       ac97_soc_remove,
 173         .suspend =      ac97_soc_suspend,
 174         .resume =       ac97_soc_resume,
 175 };
 176 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
 177
 178 MODULE_DESCRIPTION("Soc Generic AC97 driver");
 179 MODULE_AUTHOR("Liam Girdwood");
 180 MODULE_LICENSE("GPL");