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 <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                         struct snd_soc_dai *dai)
  30 {
  31         struct snd_pcm_runtime *runtime = substream->runtime;
  32         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  33         struct snd_soc_device *socdev = rtd->socdev;
  34         struct snd_soc_codec *codec = socdev->card->codec;
  35
  36         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  37                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  38         return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
  39 }
  40
  41 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
  42                 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
  43                 SNDRV_PCM_RATE_48000)
  44
  45 static struct snd_soc_dai_ops ac97_dai_ops = {
  46         .prepare        = ac97_prepare,
  47 };
  48
  49 struct snd_soc_dai ac97_dai = {
  50         .name = "AC97 HiFi",
  51         .ac97_control = 1,
  52         .playback = {
  53                 .stream_name = "AC97 Playback",
  54                 .channels_min = 1,
  55                 .channels_max = 2,
  56                 .rates = STD_AC97_RATES,
  57                 .formats = SND_SOC_STD_AC97_FMTS,},
  58         .capture = {
  59                 .stream_name = "AC97 Capture",
  60                 .channels_min = 1,
  61                 .channels_max = 2,
  62                 .rates = STD_AC97_RATES,
  63                 .formats = SND_SOC_STD_AC97_FMTS,},
  64         .ops = &ac97_dai_ops,
  65 };
  66 EXPORT_SYMBOL_GPL(ac97_dai);
  67
  68 static unsigned int ac97_read(struct snd_soc_codec *codec,
  69         unsigned int reg)
  70 {
  71         return soc_ac97_ops.read(codec->ac97, reg);
  72 }
  73
  74 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
  75         unsigned int val)
  76 {
  77         soc_ac97_ops.write(codec->ac97, reg, val);
  78         return 0;
  79 }
  80
  81 static int ac97_soc_probe(struct platform_device *pdev)
  82 {
  83         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
  84         struct snd_soc_codec *codec;
  85         struct snd_ac97_bus *ac97_bus;
  86         struct snd_ac97_template ac97_template;
  87         int ret = 0;
  88
  89         printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
  90
  91         socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
  92         if (!socdev->card->codec)
  93                 return -ENOMEM;
  94         codec = socdev->card->codec;
  95         mutex_init(&codec->mutex);
  96
  97         codec->name = "AC97";
  98         codec->owner = THIS_MODULE;
  99         codec->dai = &ac97_dai;
 100         codec->num_dai = 1;
 101         codec->write = ac97_write;
 102         codec->read = ac97_read;
 103         INIT_LIST_HEAD(&codec->dapm_widgets);
 104         INIT_LIST_HEAD(&codec->dapm_paths);
 105
 106         ret = snd_soc_new_ac97_codec(codec, &soc_ac97_ops, 0);
 107         if (ret < 0) {
 108                 printk(KERN_ERR "ASoC: failed to init gen ac97 glue\n");
 109                 goto err;
 110         }
 111
 112         /* register pcms */
 113         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 114         if (ret < 0)
 115                 goto err;
 116
 117         /* add codec as bus device for standard ac97 */
 118         ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
 119         if (ret < 0)
 120                 goto bus_err;
 121
 122         memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
 123         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
 124         if (ret < 0)
 125                 goto bus_err;
 126
 127         return 0;
 128
 129 bus_err:
 130         snd_soc_free_pcms(socdev);
 131
 132 err:
 133         kfree(socdev->card->codec);
 134         socdev->card->codec = NULL;
 135         return ret;
 136 }
 137
 138 static int ac97_soc_remove(struct platform_device *pdev)
 139 {
 140         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 141         struct snd_soc_codec *codec = socdev->card->codec;
 142
 143         if (!codec)
 144                 return 0;
 145
 146         snd_soc_free_pcms(socdev);
 147         kfree(socdev->card->codec);
 148
 149         return 0;
 150 }
 151
 152 #ifdef CONFIG_PM
 153 static int ac97_soc_suspend(struct platform_device *pdev, pm_message_t msg)
 154 {
 155         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 156
 157         snd_ac97_suspend(socdev->card->codec->ac97);
 158
 159         return 0;
 160 }
 161
 162 static int ac97_soc_resume(struct platform_device *pdev)
 163 {
 164         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 165
 166         snd_ac97_resume(socdev->card->codec->ac97);
 167
 168         return 0;
 169 }
 170 #else
 171 #define ac97_soc_suspend NULL
 172 #define ac97_soc_resume NULL
 173 #endif
 174
 175 struct snd_soc_codec_device soc_codec_dev_ac97 = {
 176         .probe =        ac97_soc_probe,
 177         .remove =       ac97_soc_remove,
 178         .suspend =      ac97_soc_suspend,
 179         .resume =       ac97_soc_resume,
 180 };
 181 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
 182
 183 MODULE_DESCRIPTION("Soc Generic AC97 driver");
 184 MODULE_AUTHOR("Liam Girdwood");
 185 MODULE_LICENSE("GPL");