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 const struct snd_soc_dapm_widget ac97_widgets[] = {
  27        SND_SOC_DAPM_INPUT("RX"),
  28        SND_SOC_DAPM_OUTPUT("TX"),
  29};
  30
  31static const struct snd_soc_dapm_route ac97_routes[] = {
  32        { "AC97 Capture", NULL, "RX" },
  33        { "TX", NULL, "AC97 Playback" },
  34};
  35
  36static int ac97_prepare(struct snd_pcm_substream *substream,
  37                        struct snd_soc_dai *dai)
  38{
  39        struct snd_soc_codec *codec = dai->codec;
  40
  41        int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  42                  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  43        return snd_ac97_set_rate(codec->ac97, reg, substream->runtime->rate);
  44}
  45
  46#define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
  47                SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
  48                SNDRV_PCM_RATE_48000)
  49
  50static const struct snd_soc_dai_ops ac97_dai_ops = {
  51        .prepare        = ac97_prepare,
  52};
  53
  54static struct snd_soc_dai_driver ac97_dai = {
  55        .name = "ac97-hifi",
  56        .ac97_control = 1,
  57        .playback = {
  58                .stream_name = "AC97 Playback",
  59                .channels_min = 1,
  60                .channels_max = 2,
  61                .rates = STD_AC97_RATES,
  62                .formats = SND_SOC_STD_AC97_FMTS,},
  63        .capture = {
  64                .stream_name = "AC97 Capture",
  65                .channels_min = 1,
  66                .channels_max = 2,
  67                .rates = STD_AC97_RATES,
  68                .formats = SND_SOC_STD_AC97_FMTS,},
  69        .ops = &ac97_dai_ops,
  70};
  71
  72static unsigned int ac97_read(struct snd_soc_codec *codec,
  73        unsigned int reg)
  74{
  75        return soc_ac97_ops->read(codec->ac97, reg);
  76}
  77
  78static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
  79        unsigned int val)
  80{
  81        soc_ac97_ops->write(codec->ac97, reg, val);
  82        return 0;
  83}
  84
  85static int ac97_soc_probe(struct snd_soc_codec *codec)
  86{
  87        struct snd_ac97_bus *ac97_bus;
  88        struct snd_ac97_template ac97_template;
  89        int ret;
  90
  91        /* add codec as bus device for standard ac97 */
  92        ret = snd_ac97_bus(codec->card->snd_card, 0, soc_ac97_ops, NULL,
  93                           &ac97_bus);
  94        if (ret < 0)
  95                return ret;
  96
  97        memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
  98        ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
  99        if (ret < 0)
 100                return ret;
 101
 102        return 0;
 103}
 104
 105#ifdef CONFIG_PM
 106static int ac97_soc_suspend(struct snd_soc_codec *codec)
 107{
 108        snd_ac97_suspend(codec->ac97);
 109
 110        return 0;
 111}
 112
 113static int ac97_soc_resume(struct snd_soc_codec *codec)
 114{
 115        snd_ac97_resume(codec->ac97);
 116
 117        return 0;
 118}
 119#else
 120#define ac97_soc_suspend NULL
 121#define ac97_soc_resume NULL
 122#endif
 123
 124static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
 125        .write =        ac97_write,
 126        .read =         ac97_read,
 127        .probe =        ac97_soc_probe,
 128        .suspend =      ac97_soc_suspend,
 129        .resume =       ac97_soc_resume,
 130
 131        .dapm_widgets = ac97_widgets,
 132        .num_dapm_widgets = ARRAY_SIZE(ac97_widgets),
 133        .dapm_routes = ac97_routes,
 134        .num_dapm_routes = ARRAY_SIZE(ac97_routes),
 135};
 136
 137static int ac97_probe(struct platform_device *pdev)
 138{
 139        return snd_soc_register_codec(&pdev->dev,
 140                        &soc_codec_dev_ac97, &ac97_dai, 1);
 141}
 142
 143static int ac97_remove(struct platform_device *pdev)
 144{
 145        snd_soc_unregister_codec(&pdev->dev);
 146        return 0;
 147}
 148
 149static struct platform_driver ac97_codec_driver = {
 150        .driver = {
 151                .name = "ac97-codec",
 152                .owner = THIS_MODULE,
 153        },
 154
 155        .probe = ac97_probe,
 156        .remove = ac97_remove,
 157};
 158
 159module_platform_driver(ac97_codec_driver);
 160
 161MODULE_DESCRIPTION("Soc Generic AC97 driver");
 162MODULE_AUTHOR("Liam Girdwood");
 163MODULE_LICENSE("GPL");
 164MODULE_ALIAS("platform:ac97-codec");
 165