LXR linux/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
  25static int ac97_prepare(struct snd_pcm_substream *substream,
  26                        struct snd_soc_dai *dai)
  27{
  28        struct snd_pcm_runtime *runtime = substream->runtime;
  29        struct snd_soc_pcm_runtime *rtd = substream->private_data;
  30        struct snd_soc_codec *codec = rtd->codec;
  31
  32        int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  33                  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  34        return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
  35}
  36
  37#define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
  38                SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
  39                SNDRV_PCM_RATE_48000)
  40
  41static struct snd_soc_dai_ops ac97_dai_ops = {
  42        .prepare        = ac97_prepare,
  43};
  44
  45static struct snd_soc_dai_driver ac97_dai = {
  46        .name = "ac97-hifi",
  47        .ac97_control = 1,
  48        .playback = {
  49                .stream_name = "AC97 Playback",
  50                .channels_min = 1,
  51                .channels_max = 2,
  52                .rates = STD_AC97_RATES,
  53                .formats = SND_SOC_STD_AC97_FMTS,},
  54        .capture = {
  55                .stream_name = "AC97 Capture",
  56                .channels_min = 1,
  57                .channels_max = 2,
  58                .rates = STD_AC97_RATES,
  59                .formats = SND_SOC_STD_AC97_FMTS,},
  60        .ops = &ac97_dai_ops,
  61};
  62
  63static 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
  69static 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
  76static int ac97_soc_probe(struct snd_soc_codec *codec)
  77{
  78        struct snd_ac97_bus *ac97_bus;
  79        struct snd_ac97_template ac97_template;
  80        int ret;
  81
  82        /* add codec as bus device for standard ac97 */
  83        ret = snd_ac97_bus(codec->card->snd_card, 0, &soc_ac97_ops, NULL, &ac97_bus);
  84        if (ret < 0)
  85                return ret;
  86
  87        memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
  88        ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
  89        if (ret < 0)
  90                return ret;
  91
  92        return 0;
  93}
  94
  95static int ac97_soc_remove(struct snd_soc_codec *codec)
  96{
  97        return 0;
  98}
  99
 100#ifdef CONFIG_PM
 101static int ac97_soc_suspend(struct snd_soc_codec *codec, pm_message_t msg)
 102{
 103        snd_ac97_suspend(codec->ac97);
 104
 105        return 0;
 106}
 107
 108static int ac97_soc_resume(struct snd_soc_codec *codec)
 109{
 110        snd_ac97_resume(codec->ac97);
 111
 112        return 0;
 113}
 114#else
 115#define ac97_soc_suspend NULL
 116#define ac97_soc_resume NULL
 117#endif
 118
 119static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
 120        .write =        ac97_write,
 121        .read =         ac97_read,
 122        .probe =        ac97_soc_probe,
 123        .remove =       ac97_soc_remove,
 124        .suspend =      ac97_soc_suspend,
 125        .resume =       ac97_soc_resume,
 126};
 127
 128static __devinit int ac97_probe(struct platform_device *pdev)
 129{
 130        return snd_soc_register_codec(&pdev->dev,
 131                        &soc_codec_dev_ac97, &ac97_dai, 1);
 132}
 133
 134static int __devexit ac97_remove(struct platform_device *pdev)
 135{
 136        snd_soc_unregister_codec(&pdev->dev);
 137        return 0;
 138}
 139
 140static struct platform_driver ac97_codec_driver = {
 141        .driver = {
 142                .name = "ac97-codec",
 143                .owner = THIS_MODULE,
 144        },
 145
 146        .probe = ac97_probe,
 147        .remove = __devexit_p(ac97_remove),
 148};
 149
 150static int __init ac97_init(void)
 151{
 152        return platform_driver_register(&ac97_codec_driver);
 153}
 154module_init(ac97_init);
 155
 156static void __exit ac97_exit(void)
 157{
 158        platform_driver_unregister(&ac97_codec_driver);
 159}
 160module_exit(ac97_exit);
 161
 162MODULE_DESCRIPTION("Soc Generic AC97 driver");
 163MODULE_AUTHOR("Liam Girdwood");
 164MODULE_LICENSE("GPL");
 165MODULE_ALIAS("platform:ac97-codec");
 166