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/*
* 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/slab.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/soc.h>
static const struct snd_soc_dapm_widget ac97_widgets[] = {
SND_SOC_DAPM_INPUT("RX"),
SND_SOC_DAPM_OUTPUT("TX"),
};
static const struct snd_soc_dapm_route ac97_routes[] = {
{ "AC97 Capture", NULL, "RX" },
{ "TX", NULL, "AC97 Playback" },
};
static int ac97_prepare(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->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, substream->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)
static const struct snd_soc_dai_ops ac97_dai_ops = {
.prepare = ac97_prepare,
};
static struct snd_soc_dai_driver ac97_dai = {
.name = "ac97-hifi",
.ac97_control = 1,
.playback = {
.stream_name = "AC97 Playback",
.channels_min = 1,
.channels_max = 2,
.rates = STD_AC97_RATES,
.formats = SND_SOC_STD_AC97_FMTS,},
.capture = {
.stream_name = "AC97 Capture",
.channels_min = 1,
.channels_max = 2,
.rates = STD_AC97_RATES,
.formats = SND_SOC_STD_AC97_FMTS,},
.ops = &ac97_dai_ops,
};
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 snd_soc_codec *codec)
{
struct snd_ac97_bus *ac97_bus;
struct snd_ac97_template ac97_template;
int ret;
/* add codec as bus device for standard ac97 */
ret = snd_ac97_bus(codec->card->snd_card, 0, soc_ac97_ops, NULL,
&ac97_bus);
if (ret < 0)
return ret;
memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
if (ret < 0)
return ret;
return 0;
}
#ifdef CONFIG_PM
static int ac97_soc_suspend(struct snd_soc_codec *codec)
{
snd_ac97_suspend(codec->ac97);
return 0;
}
static int ac97_soc_resume(struct snd_soc_codec *codec)
{
snd_ac97_resume(codec->ac97);
return 0;
}
#else
#define ac97_soc_suspend NULL
#define ac97_soc_resume NULL
#endif
static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
.write = ac97_write,
.read = ac97_read,
.probe = ac97_soc_probe,
.suspend = ac97_soc_suspend,
.resume = ac97_soc_resume,
.dapm_widgets = ac97_widgets,
.num_dapm_widgets = ARRAY_SIZE(ac97_widgets),
.dapm_routes = ac97_routes,
.num_dapm_routes = ARRAY_SIZE(ac97_routes),
};
static int ac97_probe(struct platform_device *pdev)
{
return snd_soc_register_codec(&pdev->dev,
&soc_codec_dev_ac97, &ac97_dai, 1);
}
static int ac97_remove(struct platform_device *pdev)
{
snd_soc_unregister_codec(&pdev->dev);
return 0;
}
static struct platform_driver ac97_codec_driver = {
.driver = {
.name = "ac97-codec",
.owner = THIS_MODULE,
},
.probe = ac97_probe,
.remove = ac97_remove,
};
module_platform_driver(ac97_codec_driver);
MODULE_DESCRIPTION("Soc Generic AC97 driver");
MODULE_AUTHOR("Liam Girdwood");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ac97-codec");
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