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        struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec);
  41
  42        int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  43                  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  44        return snd_ac97_set_rate(ac97, reg, substream->runtime->rate);
  45}
  46
  47static const struct snd_soc_dai_ops ac97_dai_ops = {
  48        .prepare        = ac97_prepare,
  49};
  50
  51static struct snd_soc_dai_driver ac97_dai = {
  52        .name = "ac97-hifi",
  53        .playback = {
  54                .stream_name = "AC97 Playback",
  55                .channels_min = 1,
  56                .channels_max = 2,
  57                .rates = SNDRV_PCM_RATE_KNOT,
  58                .formats = SND_SOC_STD_AC97_FMTS,},
  59        .capture = {
  60                .stream_name = "AC97 Capture",
  61                .channels_min = 1,
  62                .channels_max = 2,
  63                .rates = SNDRV_PCM_RATE_KNOT,
  64                .formats = SND_SOC_STD_AC97_FMTS,},
  65        .ops = &ac97_dai_ops,
  66};
  67
  68static int ac97_soc_probe(struct snd_soc_codec *codec)
  69{
  70        struct snd_ac97 *ac97;
  71        struct snd_ac97_bus *ac97_bus;
  72        struct snd_ac97_template ac97_template;
  73        int ret;
  74
  75        /* add codec as bus device for standard ac97 */
  76        ret = snd_ac97_bus(codec->component.card->snd_card, 0, soc_ac97_ops,
  77                           NULL, &ac97_bus);
  78        if (ret < 0)
  79                return ret;
  80
  81        memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
  82        ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
  83        if (ret < 0)
  84                return ret;
  85
  86        snd_soc_codec_set_drvdata(codec, ac97);
  87
  88        return 0;
  89}
  90
  91#ifdef CONFIG_PM
  92static int ac97_soc_suspend(struct snd_soc_codec *codec)
  93{
  94        struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec);
  95
  96        snd_ac97_suspend(ac97);
  97
  98        return 0;
  99}
 100
 101static int ac97_soc_resume(struct snd_soc_codec *codec)
 102{
 103
 104        struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec);
 105
 106        snd_ac97_resume(ac97);
 107
 108        return 0;
 109}
 110#else
 111#define ac97_soc_suspend NULL
 112#define ac97_soc_resume NULL
 113#endif
 114
 115static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
 116        .probe =        ac97_soc_probe,
 117        .suspend =      ac97_soc_suspend,
 118        .resume =       ac97_soc_resume,
 119
 120        .component_driver = {
 121                .dapm_widgets           = ac97_widgets,
 122                .num_dapm_widgets       = ARRAY_SIZE(ac97_widgets),
 123                .dapm_routes            = ac97_routes,
 124                .num_dapm_routes        = ARRAY_SIZE(ac97_routes),
 125        },
 126};
 127
 128static 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 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        },
 144
 145        .probe = ac97_probe,
 146        .remove = ac97_remove,
 147};
 148
 149module_platform_driver(ac97_codec_driver);
 150
 151MODULE_DESCRIPTION("Soc Generic AC97 driver");
 152MODULE_AUTHOR("Liam Girdwood");
 153MODULE_LICENSE("GPL");
 154MODULE_ALIAS("platform:ac97-codec");
 155