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ASoC: ADS117x ADC driver

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This patch adds support for the TI ADS117x family of multichannel ADCs
and was sponsored by Shotspotter Inc.

Signed-off-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Graeme Gregory
2009-11-04 17:49:22 +00:00
committed by Mark Brown
parent 529697c546
commit 2dcf9fb99d
4 changed files with 146 additions and 0 deletions
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127
sound/soc/codecs/ads117x.c Normal file
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/*
* ads117x.c -- Driver for ads1174/8 ADC chips
*
* Copyright 2009 ShotSpotter Inc.
* Author: Graeme Gregory <gg@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.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include "ads117x.h"
#define ADS117X_RATES (SNDRV_PCM_RATE_8000_48000)
#define ADS117X_FORMATS (SNDRV_PCM_FMTBIT_S16_LE)
struct snd_soc_dai ads117x_dai = {
/* ADC */
.name = "ADS117X ADC",
.id = 1,
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 32,
.rates = ADS117X_RATES,
.formats = ADS117X_FORMATS,},
};
EXPORT_SYMBOL_GPL(ads117x_dai);
/*
* initialise the ads117x driver
*/
static int ads117x_init(struct snd_soc_device *socdev)
{
struct snd_soc_codec *codec = socdev->card->codec;
int ret = 0;
codec->name = "ADS117X";
codec->owner = THIS_MODULE;
codec->dai = &ads117x_dai;
codec->num_dai = 1;
/* register pcms */
ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
if (ret < 0) {
printk(KERN_ERR "ads117x: failed to create pcms\n");
return ret;
}
ret = snd_soc_init_card(socdev);
if (ret < 0) {
printk(KERN_ERR "ads117x: failed to register card\n");
goto card_err;
}
return ret;
card_err:
snd_soc_free_pcms(socdev);
return ret;
}
static int ads117x_probe(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec;
int ret;
pr_info("ads117x ADC\n");
codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
if (codec == NULL)
return -ENOMEM;
socdev->card->codec = codec;
mutex_init(&codec->mutex);
INIT_LIST_HEAD(&codec->dapm_widgets);
INIT_LIST_HEAD(&codec->dapm_paths);
ret = ads117x_init(socdev);
if (ret != 0)
kfree(codec);
return ret;
}
static int ads117x_remove(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->card->codec;
snd_soc_free_pcms(socdev);
kfree(codec);
return 0;
}
struct snd_soc_codec_device soc_codec_dev_ads117x = {
.probe = ads117x_probe,
.remove = ads117x_remove,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_ads117x);
static int __init ads117x_modinit(void)
{
return snd_soc_register_dai(&ads117x_dai);
}
module_init(ads117x_modinit);
static void __exit ads117x_exit(void)
{
snd_soc_unregister_dai(&ads117x_dai);
}
module_exit(ads117x_exit);
MODULE_DESCRIPTION("ASoC ads117x driver");
MODULE_AUTHOR("Graeme Gregory");
MODULE_LICENSE("GPL");