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, &ac97_bus);
  83        if (ret < 0)
  84                return ret;
  85
  86        memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
  87        ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
  88        if (ret < 0)
  89                return ret;
  90
  91        return 0;
  92}
  93
  94#ifdef CONFIG_PM
  95static int ac97_soc_suspend(struct snd_soc_codec *codec)
  96{
  97        snd_ac97_suspend(codec->ac97);
  98
  99        return 0;
 100}
 101
 102static int ac97_soc_resume(struct snd_soc_codec *codec)
 103{
 104        snd_ac97_resume(codec->ac97);
 105
 106        return 0;
 107}
 108#else
 109#define ac97_soc_suspend NULL
 110#define ac97_soc_resume NULL
 111#endif
 112
 113static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
 114        .write =        ac97_write,
 115        .read =         ac97_read,
 116        .probe =        ac97_soc_probe,
 117        .suspend =      ac97_soc_suspend,
 118        .resume =       ac97_soc_resume,
 119};
 120
 121static __devinit int ac97_probe(struct platform_device *pdev)
 122{
 123        return snd_soc_register_codec(&pdev->dev,
 124                        &soc_codec_dev_ac97, &ac97_dai, 1);
 125}
 126
 127static int __devexit ac97_remove(struct platform_device *pdev)
 128{
 129        snd_soc_unregister_codec(&pdev->dev);
 130        return 0;
 131}
 132
 133static struct platform_driver ac97_codec_driver = {
 134        .driver = {
 135                .name = "ac97-codec",
 136                .owner = THIS_MODULE,
 137        },
 138
 139        .probe = ac97_probe,
 140        .remove = __devexit_p(ac97_remove),
 141};
 142
 143module_platform_driver(ac97_codec_driver);
 144
 145MODULE_DESCRIPTION("Soc Generic AC97 driver");
 146MODULE_AUTHOR("Liam Girdwood");
 147MODULE_LICENSE("GPL");
 148MODULE_ALIAS("platform:ac97-codec");
 149