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 <linux/module.h>
  20#include <sound/core.h>
  21#include <sound/pcm.h>
  22#include <sound/ac97_codec.h>
  23#include <sound/initval.h>
  24#include <sound/soc.h>
  25
  26static int ac97_prepare(struct snd_pcm_substream *substream,
  27                        struct snd_soc_dai *dai)
  28{
  29        struct snd_soc_codec *codec = dai->codec;
  30
  31        int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  32                  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  33        return snd_ac97_set_rate(codec->ac97, reg, substream->runtime->rate);
  34}
  35
  36#define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
  37                SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
  38                SNDRV_PCM_RATE_48000)
  39
  40static const struct snd_soc_dai_ops ac97_dai_ops = {
  41        .prepare        = ac97_prepare,
  42};
  43
  44static struct snd_soc_dai_driver ac97_dai = {
  45        .name = "ac97-hifi",
  46        .ac97_control = 1,
  47        .playback = {
  48                .stream_name = "AC97 Playback",
  49                .channels_min = 1,
  50                .channels_max = 2,
  51                .rates = STD_AC97_RATES,
  52                .formats = SND_SOC_STD_AC97_FMTS,},
  53        .capture = {
  54                .stream_name = "AC97 Capture",
  55                .channels_min = 1,
  56                .channels_max = 2,
  57                .rates = STD_AC97_RATES,
  58                .formats = SND_SOC_STD_AC97_FMTS,},
  59        .ops = &ac97_dai_ops,
  60};
  61
  62static unsigned int ac97_read(struct snd_soc_codec *codec,
  63        unsigned int reg)
  64{
  65        return soc_ac97_ops->read(codec->ac97, reg);
  66}
  67
  68static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
  69        unsigned int val)
  70{
  71        soc_ac97_ops->write(codec->ac97, reg, val);
  72        return 0;
  73}
  74
  75static int ac97_soc_probe(struct snd_soc_codec *codec)
  76{
  77        struct snd_ac97_bus *ac97_bus;
  78        struct snd_ac97_template ac97_template;
  79        int ret;
  80
  81        /* add codec as bus device for standard ac97 */
  82        ret = snd_ac97_bus(codec->card->snd_card, 0, soc_ac97_ops, NULL,
  83                           &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
  95#ifdef CONFIG_PM
  96static int ac97_soc_suspend(struct snd_soc_codec *codec)
  97{
  98        snd_ac97_suspend(codec->ac97);
  99
 100        return 0;
 101}
 102
 103static int ac97_soc_resume(struct snd_soc_codec *codec)
 104{
 105        snd_ac97_resume(codec->ac97);
 106
 107        return 0;
 108}
 109#else
 110#define ac97_soc_suspend NULL
 111#define ac97_soc_resume NULL
 112#endif
 113
 114static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
 115        .write =        ac97_write,
 116        .read =         ac97_read,
 117        .probe =        ac97_soc_probe,
 118        .suspend =      ac97_soc_suspend,
 119        .resume =       ac97_soc_resume,
 120};
 121
 122static int ac97_probe(struct platform_device *pdev)
 123{
 124        return snd_soc_register_codec(&pdev->dev,
 125                        &soc_codec_dev_ac97, &ac97_dai, 1);
 126}
 127
 128static int ac97_remove(struct platform_device *pdev)
 129{
 130        snd_soc_unregister_codec(&pdev->dev);
 131        return 0;
 132}
 133
 134static struct platform_driver ac97_codec_driver = {
 135        .driver = {
 136                .name = "ac97-codec",
 137                .owner = THIS_MODULE,
 138        },
 139
 140        .probe = ac97_probe,
 141        .remove = ac97_remove,
 142};
 143
 144module_platform_driver(ac97_codec_driver);
 145
 146MODULE_DESCRIPTION("Soc Generic AC97 driver");
 147MODULE_AUTHOR("Liam Girdwood");
 148MODULE_LICENSE("GPL");
 149MODULE_ALIAS("platform:ac97-codec");
 150