soc-utils.c
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/*
* 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 const struct snd_pcm_hardware dummy_dma_hardware = {
.formats = 0xffffffff,
.channels_min = 1,
.channels_max = UINT_MAX,
/* Random values to keep userspace happy when checking constraints */
.info = SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER,
.buffer_bytes_max = 128*1024,
.period_bytes_min = PAGE_SIZE,
.period_bytes_max = PAGE_SIZE*2,
.periods_min = 2,
.periods_max = 128,
};
static int dummy_dma_open(struct snd_pcm_substream *substream)
{
snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
return 0;
}
static struct snd_pcm_ops dummy_dma_ops = {
.open = dummy_dma_open,
.ioctl = snd_pcm_lib_ioctl,
};
static struct snd_soc_platform_driver dummy_platform = {
.ops = &dummy_dma_ops,
};
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);
}