[deliverable/linux.git] / sound / soc / soc-utils.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 const struct snd_pcm_hardware dummy_dma_hardware = {
	/* 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)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	/* BE's dont need dummy params */
	if (!rtd->dai_link->no_pcm)
		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 struct snd_soc_codec_driver dummy_codec;

#define STUB_RATES	SNDRV_PCM_RATE_8000_192000
#define STUB_FORMATS	(SNDRV_PCM_FMTBIT_S8 | \
			SNDRV_PCM_FMTBIT_U8 | \
			SNDRV_PCM_FMTBIT_S16_LE | \
			SNDRV_PCM_FMTBIT_U16_LE | \
			SNDRV_PCM_FMTBIT_S24_LE | \
			SNDRV_PCM_FMTBIT_U24_LE | \
			SNDRV_PCM_FMTBIT_S32_LE | \
			SNDRV_PCM_FMTBIT_U32_LE | \
			SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
static struct snd_soc_dai_driver dummy_dai = {
	.name = "snd-soc-dummy-dai",
	.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,
	 },
};

int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
{
	if (dai->driver == &dummy_dai)
		return 1;
	return 0;
}

static int snd_soc_dummy_probe(struct platform_device *pdev)
{
	int ret;

	ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1);
	if (ret < 0)
		return ret;

	ret = snd_soc_register_platform(&pdev->dev, &dummy_platform);
	if (ret < 0) {
		snd_soc_unregister_codec(&pdev->dev);
		return ret;
	}

	return ret;
}

static int snd_soc_dummy_remove(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);
	snd_soc_unregister_codec(&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 = 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_register_simple("snd-soc-dummy", -1, NULL, 0);
	if (IS_ERR(soc_dummy_dev))
		return PTR_ERR(soc_dummy_dev);

	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);
}
Commit	Line	Data
	1	/*
	2	* soc-util.c -- ALSA SoC Audio Layer utility functions
	3	*
	4	* Copyright 2009 Wolfson Microelectronics PLC.
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	7	* Liam Girdwood <lrg@slimlogic.co.uk>
	8	*
	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the
	12	* Free Software Foundation; either version 2 of the License, or (at your
	13	* option) any later version.
	14	*/
	15
	16	#include <linux/platform_device.h>
	17	#include <linux/export.h>
	18	#include <sound/core.h>
	19	#include <sound/pcm.h>
	20	#include <sound/pcm_params.h>
	21	#include <sound/soc.h>
	22
	23	int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
	24	{
	25	return sample_size * channels * tdm_slots;
	26	}
	27	EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
	28
	29	int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
	30	{
	31	int sample_size;
	32
	33	sample_size = snd_pcm_format_width(params_format(params));
	34	if (sample_size < 0)
	35	return sample_size;
	36
	37	return snd_soc_calc_frame_size(sample_size, params_channels(params),
	38	1);
	39	}
	40	EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
	41
	42	int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
	43	{
	44	return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
	45	}
	46	EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
	47
	48	int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
	49	{
	50	int ret;
	51
	52	ret = snd_soc_params_to_frame_size(params);
	53
	54	if (ret > 0)
	55	return ret * params_rate(params);
	56	else
	57	return ret;
	58	}
	59	EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
	60
	61	static const struct snd_pcm_hardware dummy_dma_hardware = {
	62	/* Random values to keep userspace happy when checking constraints */
	63	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	64	SNDRV_PCM_INFO_BLOCK_TRANSFER,
	65	.buffer_bytes_max = 128*1024,
	66	.period_bytes_min = PAGE_SIZE,
	67	.period_bytes_max = PAGE_SIZE*2,
	68	.periods_min = 2,
	69	.periods_max = 128,
	70	};
	71
	72	static int dummy_dma_open(struct snd_pcm_substream *substream)
	73	{
	74	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	75
	76	/* BE's dont need dummy params */
	77	if (!rtd->dai_link->no_pcm)
	78	snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
	79
	80	return 0;
	81	}
	82
	83	static struct snd_pcm_ops dummy_dma_ops = {
	84	.open = dummy_dma_open,
	85	.ioctl = snd_pcm_lib_ioctl,
	86	};
	87
	88	static struct snd_soc_platform_driver dummy_platform = {
	89	.ops = &dummy_dma_ops,
	90	};
	91
	92	static struct snd_soc_codec_driver dummy_codec;
	93
	94	#define STUB_RATES SNDRV_PCM_RATE_8000_192000
	95	#define STUB_FORMATS (SNDRV_PCM_FMTBIT_S8 \| \
	96	SNDRV_PCM_FMTBIT_U8 \| \
	97	SNDRV_PCM_FMTBIT_S16_LE \| \
	98	SNDRV_PCM_FMTBIT_U16_LE \| \
	99	SNDRV_PCM_FMTBIT_S24_LE \| \
	100	SNDRV_PCM_FMTBIT_U24_LE \| \
	101	SNDRV_PCM_FMTBIT_S32_LE \| \
	102	SNDRV_PCM_FMTBIT_U32_LE \| \
	103	SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
	104	static struct snd_soc_dai_driver dummy_dai = {
	105	.name = "snd-soc-dummy-dai",
	106	.playback = {
	107	.stream_name = "Playback",
	108	.channels_min = 1,
	109	.channels_max = 384,
	110	.rates = STUB_RATES,
	111	.formats = STUB_FORMATS,
	112	},
	113	.capture = {
	114	.stream_name = "Capture",
	115	.channels_min = 1,
	116	.channels_max = 384,
	117	.rates = STUB_RATES,
	118	.formats = STUB_FORMATS,
	119	},
	120	};
	121
	122	int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
	123	{
	124	if (dai->driver == &dummy_dai)
	125	return 1;
	126	return 0;
	127	}
	128
	129	static int snd_soc_dummy_probe(struct platform_device *pdev)
	130	{
	131	int ret;
	132
	133	ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1);
	134	if (ret < 0)
	135	return ret;
	136
	137	ret = snd_soc_register_platform(&pdev->dev, &dummy_platform);
	138	if (ret < 0) {
	139	snd_soc_unregister_codec(&pdev->dev);
	140	return ret;
	141	}
	142
	143	return ret;
	144	}
	145
	146	static int snd_soc_dummy_remove(struct platform_device *pdev)
	147	{
	148	snd_soc_unregister_platform(&pdev->dev);
	149	snd_soc_unregister_codec(&pdev->dev);
	150
	151	return 0;
	152	}
	153
	154	static struct platform_driver soc_dummy_driver = {
	155	.driver = {
	156	.name = "snd-soc-dummy",
	157	.owner = THIS_MODULE,
	158	},
	159	.probe = snd_soc_dummy_probe,
	160	.remove = snd_soc_dummy_remove,
	161	};
	162
	163	static struct platform_device *soc_dummy_dev;
	164
	165	int __init snd_soc_util_init(void)
	166	{
	167	int ret;
	168
	169	soc_dummy_dev =
	170	platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
	171	if (IS_ERR(soc_dummy_dev))
	172	return PTR_ERR(soc_dummy_dev);
	173
	174	ret = platform_driver_register(&soc_dummy_driver);
	175	if (ret != 0)
	176	platform_device_unregister(soc_dummy_dev);
	177
	178	return ret;
	179	}
	180
	181	void __exit snd_soc_util_exit(void)
	182	{
	183	platform_device_unregister(soc_dummy_dev);
	184	platform_driver_unregister(&soc_dummy_driver);
	185	}