root/sound/soc/codecs/ac97.c

DEFINITIONS

1. ac97_prepare
2. ac97_read
3. ac97_write
4. ac97_soc_probe
5. ac97_soc_remove
6. ac97_soc_suspend
7. ac97_soc_resume

/*
 * ac97.c  --  ALSA Soc AC97 codec support
 *
 * Copyright 2005 Wolfson Microelectronics PLC.
 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 * Generic AC97 support.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include "ac97.h"

#define AC97_VERSION "0.6"

static int ac97_prepare(struct snd_pcm_substream *substream)
{
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
        struct snd_soc_device *socdev = rtd->socdev;
        struct snd_soc_codec *codec = socdev->codec;

        int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
                  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
        return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
}

#define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
                SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
                SNDRV_PCM_RATE_48000)

struct snd_soc_dai ac97_dai = {
        .name = "AC97 HiFi",
        .type = SND_SOC_DAI_AC97,
        .playback = {
                .stream_name = "AC97 Playback",
                .channels_min = 1,
                .channels_max = 2,
                .rates = STD_AC97_RATES,
                .formats = SNDRV_PCM_FMTBIT_S16_LE,},
        .capture = {
                .stream_name = "AC97 Capture",
                .channels_min = 1,
                .channels_max = 2,
                .rates = STD_AC97_RATES,
                .formats = SNDRV_PCM_FMTBIT_S16_LE,},
        .ops = {
                .prepare = ac97_prepare,},
};
EXPORT_SYMBOL_GPL(ac97_dai);

static unsigned int ac97_read(struct snd_soc_codec *codec,
        unsigned int reg)
{
        return soc_ac97_ops.read(codec->ac97, reg);
}

static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
        unsigned int val)
{
        soc_ac97_ops.write(codec->ac97, reg, val);
        return 0;
}

static int ac97_soc_probe(struct platform_device *pdev)
{
        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
        struct snd_soc_codec *codec;
        struct snd_ac97_bus *ac97_bus;
        struct snd_ac97_template ac97_template;
        int ret = 0;

        printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);

        socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
        if (!socdev->codec)
                return -ENOMEM;
        codec = socdev->codec;
        mutex_init(&codec->mutex);

        codec->name = "AC97";
        codec->owner = THIS_MODULE;
        codec->dai = &ac97_dai;
        codec->num_dai = 1;
        codec->write = ac97_write;
        codec->read = ac97_read;
        INIT_LIST_HEAD(&codec->dapm_widgets);
        INIT_LIST_HEAD(&codec->dapm_paths);

        /* register pcms */
        ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
        if (ret < 0)
                goto err;

        /* add codec as bus device for standard ac97 */
        ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
        if (ret < 0)
                goto bus_err;

        memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
        ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
        if (ret < 0)
                goto bus_err;

        ret = snd_soc_register_card(socdev);
        if (ret < 0)
                goto bus_err;
        return 0;

bus_err:
        snd_soc_free_pcms(socdev);

err:
        kfree(socdev->codec->reg_cache);
        kfree(socdev->codec);
        socdev->codec = NULL;
        return ret;
}

static int ac97_soc_remove(struct platform_device *pdev)
{
        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
        struct snd_soc_codec *codec = socdev->codec;

        if (!codec)
                return 0;

        snd_soc_free_pcms(socdev);
        kfree(socdev->codec->reg_cache);
        kfree(socdev->codec);

        return 0;
}

#ifdef CONFIG_PM
static int ac97_soc_suspend(struct platform_device *pdev, pm_message_t msg)
{
        struct snd_soc_device *socdev = platform_get_drvdata(pdev);

        snd_ac97_suspend(socdev->codec->ac97);

        return 0;
}

static int ac97_soc_resume(struct platform_device *pdev)
{
        struct snd_soc_device *socdev = platform_get_drvdata(pdev);

        snd_ac97_resume(socdev->codec->ac97);

        return 0;
}
#else
#define ac97_soc_suspend NULL
#define ac97_soc_resume NULL
#endif

struct snd_soc_codec_device soc_codec_dev_ac97 = {
        .probe =        ac97_soc_probe,
        .remove =       ac97_soc_remove,
        .suspend =      ac97_soc_suspend,
        .resume =       ac97_soc_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);

MODULE_DESCRIPTION("Soc Generic AC97 driver");
MODULE_AUTHOR("Liam Girdwood");
MODULE_LICENSE("GPL");