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[ALSA] ASoC codecs: generic AC97 support

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This patch allows the std Alsa AC97 codec driver to use any AsoC AC97
controller driver. Currently, only HiFi playback and Capture are
supported atm.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Richard Purdie 2006-10-06 18:38:03 +02:00 committed by Jaroslav Kysela
parent 10c5cf3044
commit dbc6b6ad76
2 changed files with 185 additions and 0 deletions
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167
sound/soc/codecs/ac97.c Normal file
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/*
* ac97.c -- ALSA Soc AC97 codec support
*
* Copyright 2005 Wolfson Microelectronics PLC.
* Author: Liam Girdwood
* liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
*
* 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.
*
* Revision history
* 17th Oct 2005 Initial version.
*
* Generic AC97 support.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/soc.h>
#define AC97_VERSION "0.5"
#define AC97_DIR \
(SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
#define AC97_RATES \
(SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
SNDRV_PCM_RATE_48000)
/* may need to expand this */
static struct snd_soc_dai_mode soc_ac97[] = {
{0, 0, SNDRV_PCM_FMTBIT_S16_LE, AC97_RATES},
{0, 0, SNDRV_PCM_FMTBIT_S18_3LE, AC97_RATES},
{0, 0, SNDRV_PCM_FMTBIT_S20_3LE, AC97_RATES},
};
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);
}
static struct snd_soc_codec_dai ac97_dai = {
.name = "AC97 HiFi",
.playback = {
.stream_name = "AC97 Playback",
.channels_min = 1,
.channels_max = 2,},
.capture = {
.stream_name = "AC97 Capture",
.channels_min = 1,
.channels_max = 2,},
.ops = {
.prepare = ac97_prepare,},
.caps = {
.num_modes = ARRAY_SIZE(soc_ac97),
.mode = soc_ac97,},
};
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 == NULL)
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 == NULL)
return 0;
snd_soc_free_pcms(socdev);
kfree(socdev->codec->reg_cache);
kfree(socdev->codec);
return 0;
}
struct snd_soc_codec_device soc_codec_dev_ac97= {
.probe = ac97_soc_probe,
.remove = ac97_soc_remove,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
MODULE_DESCRIPTION("Soc Generic AC97 driver");
MODULE_AUTHOR("Liam Girdwood");
MODULE_LICENSE("GPL");

18
sound/soc/codecs/ac97.h Normal file
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/*
* linux/sound/codecs/ac97.h -- ALSA SoC Layer
*
* Author: Liam Girdwood
* Created: Dec 1st 2005
* Copyright: Wolfson Microelectronics. PLC.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __LINUX_SND_SOC_AC97_H
#define __LINUX_SND_SOC_AC97_H
extern struct snd_soc_codec_device soc_codec_dev_ac97;
#endif