158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
/*
|
|
* 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/core.h>
|
|
#include <sound/pcm.h>
|
|
#include <sound/ac97_codec.h>
|
|
#include <sound/initval.h>
|
|
#include <sound/soc.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_codec_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 == 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");
|