linux-pinenote/sound/soc/codecs/ad73311.c

/*
 * ad73311.c  --  ALSA Soc AD73311 codec support
 *
 * Copyright:	Analog Device Inc.
 * Author:	Cliff Cai <cliff.cai@analog.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.
 */

#include <linux/init.h>
#include <linux/module.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 "ad73311.h"

struct snd_soc_dai ad73311_dai = {
	.name = "AD73311",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 1,
		.channels_max = 1,
		.rates = SNDRV_PCM_RATE_8000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE, },
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 1,
		.rates = SNDRV_PCM_RATE_8000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE, },
};
EXPORT_SYMBOL_GPL(ad73311_dai);

static int ad73311_soc_probe(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec;
	int ret = 0;

	codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
	if (codec == NULL)
		return -ENOMEM;
	mutex_init(&codec->mutex);
	codec->name = "AD73311";
	codec->owner = THIS_MODULE;
	codec->dai = &ad73311_dai;
	codec->num_dai = 1;
	socdev->card->codec = codec;
	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) {
		printk(KERN_ERR "ad73311: failed to create pcms\n");
		goto pcm_err;
	}

	return ret;

pcm_err:
	kfree(socdev->card->codec);
	socdev->card->codec = NULL;
	return ret;
}

static int ad73311_soc_remove(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->card->codec;

	if (codec == NULL)
		return 0;
	snd_soc_free_pcms(socdev);
	kfree(codec);
	return 0;
}

struct snd_soc_codec_device soc_codec_dev_ad73311 = {
	.probe = 	ad73311_soc_probe,
	.remove = 	ad73311_soc_remove,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_ad73311);

static int __init ad73311_init(void)
{
	return snd_soc_register_dai(&ad73311_dai);
}
module_init(ad73311_init);

static void __exit ad73311_exit(void)
{
	snd_soc_unregister_dai(&ad73311_dai);
}
module_exit(ad73311_exit);

MODULE_DESCRIPTION("ASoC ad73311 driver");
MODULE_AUTHOR("Cliff Cai ");
MODULE_LICENSE("GPL");