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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
* Copyright: (C) 2009-2012, NVIDIA Corporation.
*
* 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 <asm/mach-types.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <sound/soc.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#define DRV_NAME "spdif-dit"
#define STUB_RATES SNDRV_PCM_RATE_8000_96000
#define STUB_FORMATS SNDRV_PCM_FMTBIT_S16_LE
static struct snd_soc_codec_driver soc_codec_spdif_dit;
static int spdif_probe(struct snd_soc_codec *codec) {
codec->dapm.idle_bias_off = 1;
return 0;
}
static const struct snd_soc_dapm_widget spdif_dapm_widgets[] = {
SND_SOC_DAPM_VMID("spdif dummy Vmid"),
};
static int spdif_write(struct snd_soc_codec * codec, unsigned int reg,
unsigned int val){
return 0;
}
static int spdif_read(struct snd_soc_codec * codec, unsigned int reg){
return 0;
}
static struct snd_soc_codec_driver soc_codec_spdif_dit1 = {
.probe = spdif_probe,
.dapm_widgets = spdif_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(spdif_dapm_widgets),
.read = spdif_read,
.write = spdif_write,
};
static struct snd_soc_dai_driver dit_stub_dai = {
.name = "dit-hifi",
.playback = {
.stream_name = "Playback",
.channels_min = 1,
.channels_max = 384,
.rates = STUB_RATES,
.formats = STUB_FORMATS,
},
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 384,
.rates = STUB_RATES,
.formats = STUB_FORMATS,
},
};
static int spdif_dit_probe(struct platform_device *pdev)
{
if(machine_is_kai() || machine_is_tegra_enterprise())
return snd_soc_register_codec(&pdev->dev,
&soc_codec_spdif_dit1, &dit_stub_dai, 1);
else
return snd_soc_register_codec(&pdev->dev,
&soc_codec_spdif_dit, &dit_stub_dai, 1);
}
static int spdif_dit_remove(struct platform_device *pdev)
{
snd_soc_unregister_codec(&pdev->dev);
return 0;
}
static struct platform_driver spdif_dit_driver = {
.probe = spdif_dit_probe,
.remove = spdif_dit_remove,
.driver = {
.name = DRV_NAME,
.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);
MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
MODULE_DESCRIPTION("SPDIF dummy codec driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
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