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/*
* ALSA SoC SPDIF DIT driver
*
* This driver is used by controllers which can operate in DIT (SPDI/F) where
* no codec is needed. This file provides stub codec that can be used
* in these configurations. TI DaVinci Audio controller uses this driver.
*
* Author: Steve Chen, <schen@mvista.com>
* Copyright: (C) 2009 MontaVista Software, Inc., <source@mvista.com>
* Copyright: (C) 2009 Texas Instruments, India
*
* 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.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <sound/soc.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include "spdif_transciever.h"
MODULE_LICENSE("GPL");
#define STUB_RATES SNDRV_PCM_RATE_8000_96000
#define STUB_FORMATS SNDRV_PCM_FMTBIT_S16_LE
static struct snd_soc_codec *spdif_dit_codec;
static int spdif_dit_codec_probe(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec;
int ret;
if (spdif_dit_codec == NULL) {
dev_err(&pdev->dev, "Codec device not registered\n");
return -ENODEV;
}
socdev->card->codec = spdif_dit_codec;
codec = spdif_dit_codec;
ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
if (ret < 0) {
dev_err(codec->dev, "failed to create pcms: %d\n", ret);
goto err_create_pcms;
}
return 0;
err_create_pcms:
return ret;
}
static int spdif_dit_codec_remove(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
snd_soc_free_pcms(socdev);
return 0;
}
struct snd_soc_codec_device soc_codec_dev_spdif_dit = {
.probe = spdif_dit_codec_probe,
.remove = spdif_dit_codec_remove,
}; EXPORT_SYMBOL_GPL(soc_codec_dev_spdif_dit);
struct snd_soc_dai dit_stub_dai = {
.name = "DIT",
.playback = {
.stream_name = "Playback",
.channels_min = 1,
.channels_max = 384,
.rates = STUB_RATES,
.formats = STUB_FORMATS,
},
};
EXPORT_SYMBOL_GPL(dit_stub_dai);
static int spdif_dit_probe(struct platform_device *pdev)
{
struct snd_soc_codec *codec;
int ret;
if (spdif_dit_codec) {
dev_err(&pdev->dev, "Another Codec is registered\n");
ret = -EINVAL;
goto err_reg_codec;
}
codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
if (codec == NULL)
return -ENOMEM;
codec->dev = &pdev->dev;
mutex_init(&codec->mutex);
INIT_LIST_HEAD(&codec->dapm_widgets);
INIT_LIST_HEAD(&codec->dapm_paths);
codec->name = "spdif-dit";
codec->owner = THIS_MODULE;
codec->dai = &dit_stub_dai;
codec->num_dai = 1;
spdif_dit_codec = codec;
ret = snd_soc_register_codec(codec);
if (ret < 0) {
dev_err(codec->dev, "Failed to register codec: %d\n", ret);
goto err_reg_codec;
}
dit_stub_dai.dev = &pdev->dev;
ret = snd_soc_register_dai(&dit_stub_dai);
if (ret < 0) {
dev_err(codec->dev, "Failed to register dai: %d\n", ret);
goto err_reg_dai;
}
return 0;
err_reg_dai:
snd_soc_unregister_codec(codec);
err_reg_codec:
kfree(spdif_dit_codec);
return ret;
}
static int spdif_dit_remove(struct platform_device *pdev)
{
snd_soc_unregister_dai(&dit_stub_dai);
snd_soc_unregister_codec(spdif_dit_codec);
kfree(spdif_dit_codec);
spdif_dit_codec = NULL;
return 0;
}
static struct platform_driver spdif_dit_driver = {
.probe = spdif_dit_probe,
.remove = spdif_dit_remove,
.driver = {
.name = "spdif-dit",
.owner = THIS_MODULE,
},
};
static int __init dit_modinit(void)
{
return platform_driver_register(&spdif_dit_driver);
}
static void __exit dit_exit(void)
{
platform_driver_unregister(&spdif_dit_driver);
}
module_init(dit_modinit);
module_exit(dit_exit);
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