112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
/*
|
|
* soc-util.c -- ALSA SoC Audio Layer utility functions
|
|
*
|
|
* Copyright 2009 Wolfson Microelectronics PLC.
|
|
*
|
|
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
* Liam Girdwood <lrg@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/platform_device.h>
|
|
#include <linux/export.h>
|
|
#include <sound/core.h>
|
|
#include <sound/pcm.h>
|
|
#include <sound/pcm_params.h>
|
|
#include <sound/soc.h>
|
|
|
|
int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
|
|
{
|
|
return sample_size * channels * tdm_slots;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
|
|
|
|
int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
|
|
{
|
|
int sample_size;
|
|
|
|
sample_size = snd_pcm_format_width(params_format(params));
|
|
if (sample_size < 0)
|
|
return sample_size;
|
|
|
|
return snd_soc_calc_frame_size(sample_size, params_channels(params),
|
|
1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
|
|
|
|
int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
|
|
{
|
|
return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
|
|
|
|
int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
|
|
{
|
|
int ret;
|
|
|
|
ret = snd_soc_params_to_frame_size(params);
|
|
|
|
if (ret > 0)
|
|
return ret * params_rate(params);
|
|
else
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
|
|
|
|
static struct snd_soc_platform_driver dummy_platform;
|
|
|
|
static __devinit int snd_soc_dummy_probe(struct platform_device *pdev)
|
|
{
|
|
return snd_soc_register_platform(&pdev->dev, &dummy_platform);
|
|
}
|
|
|
|
static __devexit int snd_soc_dummy_remove(struct platform_device *pdev)
|
|
{
|
|
snd_soc_unregister_platform(&pdev->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver soc_dummy_driver = {
|
|
.driver = {
|
|
.name = "snd-soc-dummy",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = snd_soc_dummy_probe,
|
|
.remove = __devexit_p(snd_soc_dummy_remove),
|
|
};
|
|
|
|
static struct platform_device *soc_dummy_dev;
|
|
|
|
int __init snd_soc_util_init(void)
|
|
{
|
|
int ret;
|
|
|
|
soc_dummy_dev = platform_device_alloc("snd-soc-dummy", -1);
|
|
if (!soc_dummy_dev)
|
|
return -ENOMEM;
|
|
|
|
ret = platform_device_add(soc_dummy_dev);
|
|
if (ret != 0) {
|
|
platform_device_put(soc_dummy_dev);
|
|
return ret;
|
|
}
|
|
|
|
ret = platform_driver_register(&soc_dummy_driver);
|
|
if (ret != 0)
|
|
platform_device_unregister(soc_dummy_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void __exit snd_soc_util_exit(void)
|
|
{
|
|
platform_device_unregister(soc_dummy_dev);
|
|
platform_driver_unregister(&soc_dummy_driver);
|
|
}
|