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_card *card = socdev->card;
  85         struct snd_soc_codec *codec;
  86         struct snd_ac97_bus *ac97_bus;
  87         struct snd_ac97_template ac97_template;
  88         int i;
  89         int ret = 0;
  90
  91         printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
  92
  93         socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
  94         if (!socdev->card->codec)
  95                 return -ENOMEM;
  96         codec = socdev->card->codec;
  97         mutex_init(&codec->mutex);
  98
  99         codec->name = "AC97";
 100         codec->owner = THIS_MODULE;
 101         codec->dai = &ac97_dai;
 102         codec->num_dai = 1;
 103         codec->write = ac97_write;
 104         codec->read = ac97_read;
 105         INIT_LIST_HEAD(&codec->dapm_widgets);
 106         INIT_LIST_HEAD(&codec->dapm_paths);
 107
 108         /* register pcms */
 109         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 110         if (ret < 0)
 111                 goto err;
 112
 113         /* add codec as bus device for standard ac97 */
 114         ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
 115         if (ret < 0)
 116                 goto bus_err;
 117
 118         memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
 119         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
 120         if (ret < 0)
 121                 goto bus_err;
 122
 123         for (i = 0; i < card->num_links; i++) {
 124                 if (card->dai_link[i].codec_dai->ac97_control) {
 125                         snd_ac97_dev_add_pdata(codec->ac97,
 126                                 card->dai_link[i].cpu_dai->ac97_pdata);
 127                 }
 128         }
 129
 130         return 0;
 131
 132 bus_err:
 133         snd_soc_free_pcms(socdev);
 134
 135 err:
 136         kfree(socdev->card->codec);
 137         socdev->card->codec = NULL;
 138         return ret;
 139 }
 140
 141 static int ac97_soc_remove(struct platform_device *pdev)
 142 {
 143         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 144         struct snd_soc_codec *codec = socdev->card->codec;
 145
 146         if (!codec)
 147                 return 0;
 148
 149         snd_soc_free_pcms(socdev);
 150         kfree(socdev->card->codec);
 151
 152         return 0;
 153 }
 154
 155 #ifdef CONFIG_PM
 156 static int ac97_soc_suspend(struct platform_device *pdev, pm_message_t msg)
 157 {
 158         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 159
 160         snd_ac97_suspend(socdev->card->codec->ac97);
 161
 162         return 0;
 163 }
 164
 165 static int ac97_soc_resume(struct platform_device *pdev)
 166 {
 167         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 168
 169         snd_ac97_resume(socdev->card->codec->ac97);
 170
 171         return 0;
 172 }
 173 #else
 174 #define ac97_soc_suspend NULL
 175 #define ac97_soc_resume NULL
 176 #endif
 177
 178 struct snd_soc_codec_device soc_codec_dev_ac97 = {
 179         .probe =        ac97_soc_probe,
 180         .remove =       ac97_soc_remove,
 181         .suspend =      ac97_soc_suspend,
 182         .resume =       ac97_soc_resume,
 183 };
 184 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
 185
 186 MODULE_DESCRIPTION("Soc Generic AC97 driver");
 187 MODULE_AUTHOR("Liam Girdwood");
 188 MODULE_LICENSE("GPL");