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/kernel.h>
  17#include <linux/device.h>
  18#include <sound/core.h>
  19#include <sound/pcm.h>
  20#include <sound/ac97_codec.h>
  21#include <sound/initval.h>
  22#include <sound/soc.h>
  23#include "ac97.h"
  24
  25#define AC97_VERSION "0.6"
  26
  27static int ac97_prepare(struct snd_pcm_substream *substream,
  28                        struct snd_soc_dai *dai)
  29{
  30        struct snd_pcm_runtime *runtime = substream->runtime;
  31        struct snd_soc_pcm_runtime *rtd = substream->private_data;
  32        struct snd_soc_device *socdev = rtd->socdev;
  33        struct snd_soc_codec *codec = socdev->card->codec;
  34
  35        int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  36                  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  37        return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
  38}
  39
  40#define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
  41                SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
  42                SNDRV_PCM_RATE_48000)
  43
  44static struct snd_soc_dai_ops ac97_dai_ops = {
  45        .prepare        = ac97_prepare,
  46};
  47
  48struct snd_soc_dai ac97_dai = {
  49        .name = "AC97 HiFi",
  50        .ac97_control = 1,
  51        .playback = {
  52                .stream_name = "AC97 Playback",
  53                .channels_min = 1,
  54                .channels_max = 2,
  55                .rates = STD_AC97_RATES,
  56                .formats = SND_SOC_STD_AC97_FMTS,},
  57        .capture = {
  58                .stream_name = "AC97 Capture",
  59                .channels_min = 1,
  60                .channels_max = 2,
  61                .rates = STD_AC97_RATES,
  62                .formats = SND_SOC_STD_AC97_FMTS,},
  63        .ops = &ac97_dai_ops,
  64};
  65EXPORT_SYMBOL_GPL(ac97_dai);
  66
  67static unsigned int ac97_read(struct snd_soc_codec *codec,
  68        unsigned int reg)
  69{
  70        return soc_ac97_ops.read(codec->ac97, reg);
  71}
  72
  73static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
  74        unsigned int val)
  75{
  76        soc_ac97_ops.write(codec->ac97, reg, val);
  77        return 0;
  78}
  79
  80static int ac97_soc_probe(struct platform_device *pdev)
  81{
  82        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
  83        struct snd_soc_codec *codec;
  84        struct snd_ac97_bus *ac97_bus;
  85        struct snd_ac97_template ac97_template;
  86        int ret = 0;
  87
  88        printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
  89
  90        socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
  91        if (!socdev->card->codec)
  92                return -ENOMEM;
  93        codec = socdev->card->codec;
  94        mutex_init(&codec->mutex);
  95
  96        codec->name = "AC97";
  97        codec->owner = THIS_MODULE;
  98        codec->dai = &ac97_dai;
  99        codec->num_dai = 1;
 100        codec->write = ac97_write;
 101        codec->read = ac97_read;
 102        INIT_LIST_HEAD(&codec->dapm_widgets);
 103        INIT_LIST_HEAD(&codec->dapm_paths);
 104
 105        /* register pcms */
 106        ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 107        if (ret < 0)
 108                goto err;
 109
 110        /* add codec as bus device for standard ac97 */
 111        ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
 112        if (ret < 0)
 113                goto bus_err;
 114
 115        memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
 116        ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
 117        if (ret < 0)
 118                goto bus_err;
 119
 120        ret = snd_soc_init_card(socdev);
 121        if (ret < 0)
 122                goto bus_err;
 123        return 0;
 124
 125bus_err:
 126        snd_soc_free_pcms(socdev);
 127
 128err:
 129        kfree(socdev->card->codec);
 130        socdev->card->codec = NULL;
 131        return ret;
 132}
 133
 134static int ac97_soc_remove(struct platform_device *pdev)
 135{
 136        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 137        struct snd_soc_codec *codec = socdev->card->codec;
 138
 139        if (!codec)
 140                return 0;
 141
 142        snd_soc_free_pcms(socdev);
 143        kfree(socdev->card->codec);
 144
 145        return 0;
 146}
 147
 148#ifdef CONFIG_PM
 149static int ac97_soc_suspend(struct platform_device *pdev, pm_message_t msg)
 150{
 151        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 152
 153        snd_ac97_suspend(socdev->card->codec->ac97);
 154
 155        return 0;
 156}
 157
 158static int ac97_soc_resume(struct platform_device *pdev)
 159{
 160        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 161
 162        snd_ac97_resume(socdev->card->codec->ac97);
 163
 164        return 0;
 165}
 166#else
 167#define ac97_soc_suspend NULL
 168#define ac97_soc_resume NULL
 169#endif
 170
 171struct snd_soc_codec_device soc_codec_dev_ac97 = {
 172        .probe =        ac97_soc_probe,
 173        .remove =       ac97_soc_remove,
 174        .suspend =      ac97_soc_suspend,
 175        .resume =       ac97_soc_resume,
 176};
 177EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
 178
 179MODULE_DESCRIPTION("Soc Generic AC97 driver");
 180MODULE_AUTHOR("Liam Girdwood");
 181MODULE_LICENSE("GPL");
 182