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/kernel.h>
  17 #include <linux/device.h>
  18 #include <sound/core.h>
  19 #include <sound/pcm.h>
  20 #include <sound/ac97_codec.h>
  21 #include <sound/initval.h>
  22 #include <sound/soc.h>
  23 #include "ac97.h"
  24
  25 #define AC97_VERSION "0.6"
  26
  27 static int ac97_prepare(struct snd_pcm_substream *substream,
  28                         struct snd_soc_dai *dai)
  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->card->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 static struct snd_soc_dai_ops ac97_dai_ops = {
  45         .prepare        = ac97_prepare,
  46 };
  47
  48 struct snd_soc_dai ac97_dai = {
  49         .name = "AC97 HiFi",
  50         .ac97_control = 1,
  51         .playback = {
  52                 .stream_name = "AC97 Playback",
  53                 .channels_min = 1,
  54                 .channels_max = 2,
  55                 .rates = STD_AC97_RATES,
  56                 .formats = SND_SOC_STD_AC97_FMTS,},
  57         .capture = {
  58                 .stream_name = "AC97 Capture",
  59                 .channels_min = 1,
  60                 .channels_max = 2,
  61                 .rates = STD_AC97_RATES,
  62                 .formats = SND_SOC_STD_AC97_FMTS,},
  63         .ops = &ac97_dai_ops,
  64 };
  65 EXPORT_SYMBOL_GPL(ac97_dai);
  66
  67 static unsigned int ac97_read(struct snd_soc_codec *codec,
  68         unsigned int reg)
  69 {
  70         return soc_ac97_ops.read(codec->ac97, reg);
  71 }
  72
  73 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
  74         unsigned int val)
  75 {
  76         soc_ac97_ops.write(codec->ac97, reg, val);
  77         return 0;
  78 }
  79
  80 static int ac97_soc_probe(struct platform_device *pdev)
  81 {
  82         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
  83         struct snd_soc_codec *codec;
  84         struct snd_ac97_bus *ac97_bus;
  85         struct snd_ac97_template ac97_template;
  86         int ret = 0;
  87
  88         printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
  89
  90         socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
  91         if (!socdev->card->codec)
  92                 return -ENOMEM;
  93         codec = socdev->card->codec;
  94         mutex_init(&codec->mutex);
  95
  96         codec->name = "AC97";
  97         codec->owner = THIS_MODULE;
  98         codec->dai = &ac97_dai;
  99         codec->num_dai = 1;
 100         codec->write = ac97_write;
 101         codec->read = ac97_read;
 102         INIT_LIST_HEAD(&codec->dapm_widgets);
 103         INIT_LIST_HEAD(&codec->dapm_paths);
 104
 105         /* register pcms */
 106         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 107         if (ret < 0)
 108                 goto err;
 109
 110         /* add codec as bus device for standard ac97 */
 111         ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
 112         if (ret < 0)
 113                 goto bus_err;
 114
 115         memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
 116         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
 117         if (ret < 0)
 118                 goto bus_err;
 119
 120         ret = snd_soc_init_card(socdev);
 121         if (ret < 0)
 122                 goto bus_err;
 123         return 0;
 124
 125 bus_err:
 126         snd_soc_free_pcms(socdev);
 127
 128 err:
 129         kfree(socdev->card->codec);
 130         socdev->card->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->card->codec;
 138
 139         if (!codec)
 140                 return 0;
 141
 142         snd_soc_free_pcms(socdev);
 143         kfree(socdev->card->codec);
 144
 145         return 0;
 146 }
 147
 148 #ifdef CONFIG_PM
 149 static int ac97_soc_suspend(struct platform_device *pdev, pm_message_t msg)
 150 {
 151         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 152
 153         snd_ac97_suspend(socdev->card->codec->ac97);
 154
 155         return 0;
 156 }
 157
 158 static int ac97_soc_resume(struct platform_device *pdev)
 159 {
 160         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 161
 162         snd_ac97_resume(socdev->card->codec->ac97);
 163
 164         return 0;
 165 }
 166 #else
 167 #define ac97_soc_suspend NULL
 168 #define ac97_soc_resume NULL
 169 #endif
 170
 171 struct snd_soc_codec_device soc_codec_dev_ac97 = {
 172         .probe =        ac97_soc_probe,
 173         .remove =       ac97_soc_remove,
 174         .suspend =      ac97_soc_suspend,
 175         .resume =       ac97_soc_resume,
 176 };
 177 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
 178
 179 MODULE_DESCRIPTION("Soc Generic AC97 driver");
 180 MODULE_AUTHOR("Liam Girdwood");
 181 MODULE_LICENSE("GPL");