[linux-block.git] / sound / soc / ep93xx / edb93xx.c

/*
 * SoC audio for EDB93xx
 *
 * Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * This driver support CS4271 codec being master or slave, working
 * in control port mode, connected either via SPI or I2C.
 * The data format accepted is I2S or left-justified.
 * DAPM support not implemented.
 */

#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>
#include "ep93xx-pcm.h"

static int edb93xx_hw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	int err;
	unsigned int mclk_rate;
	unsigned int rate = params_rate(params);

	/*
	 * According to CS4271 datasheet we use MCLK/LRCK=256 for
	 * rates below 50kHz and 128 for higher sample rates
	 */
	if (rate < 50000)
		mclk_rate = rate * 64 * 4;
	else
		mclk_rate = rate * 64 * 2;

	err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
				     SND_SOC_CLOCK_IN);
	if (err)
		return err;

	return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
				      SND_SOC_CLOCK_OUT);
}

static struct snd_soc_ops edb93xx_ops = {
	.hw_params	= edb93xx_hw_params,
};

static struct snd_soc_dai_link edb93xx_dai = {
	.name		= "CS4271",
	.stream_name	= "CS4271 HiFi",
	.platform_name	= "ep93xx-pcm-audio",
	.cpu_dai_name	= "ep93xx-i2s",
	.codec_name	= "spi0.0",
	.codec_dai_name	= "cs4271-hifi",
	.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_IF |
			  SND_SOC_DAIFMT_CBS_CFS,
	.ops		= &edb93xx_ops,
};

static struct snd_soc_card snd_soc_edb93xx = {
	.name		= "EDB93XX",
	.owner		= THIS_MODULE,
	.dai_link	= &edb93xx_dai,
	.num_links	= 1,
};

static int __devinit edb93xx_probe(struct platform_device *pdev)
{
	struct snd_soc_card *card = &snd_soc_edb93xx;
	int ret;

	ret = ep93xx_i2s_acquire();
	if (ret)
		return ret;

	card->dev = &pdev->dev;

	ret = snd_soc_register_card(card);
	if (ret) {
		dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
			ret);
		ep93xx_i2s_release();
	}

	return ret;
}

static int __devexit edb93xx_remove(struct platform_device *pdev)
{
	struct snd_soc_card *card = platform_get_drvdata(pdev);

	snd_soc_unregister_card(card);
	ep93xx_i2s_release();

	return 0;
}

static struct platform_driver edb93xx_driver = {
	.driver		= {
		.name	= "edb93xx-audio",
		.owner	= THIS_MODULE,
	},
	.probe		= edb93xx_probe,
	.remove		= __devexit_p(edb93xx_remove),
};

module_platform_driver(edb93xx_driver);

MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
MODULE_DESCRIPTION("ALSA SoC EDB93xx");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:edb93xx-audio");
Commit	Line	Data
86c33041 AS	1	/*
	2	* SoC audio for EDB93xx
	3	*
	4	* Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version 2
	9	* of the License, or (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* This driver support CS4271 codec being master or slave, working
	17	* in control port mode, connected either via SPI or I2C.
	18	* The data format accepted is I2S or left-justified.
	19	* DAPM support not implemented.
	20	*/
	21
	22	#include <linux/platform_device.h>
	23	#include <linux/gpio.h>
da155d5b	24	#include <linux/module.h>
86c33041 AS	25	#include <sound/core.h>
	26	#include <sound/pcm.h>
	27	#include <sound/soc.h>
	28	#include <asm/mach-types.h>
	29	#include <mach/hardware.h>
	30	#include "ep93xx-pcm.h"
	31
86c33041 AS	32	static int edb93xx_hw_params(struct snd_pcm_substream *substream,
	33	struct snd_pcm_hw_params *params)
	34	{
	35	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	36	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	37	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	38	int err;
6d33cd77	39	unsigned int mclk_rate;
86c33041	40	unsigned int rate = params_rate(params);
6d33cd77	41
86c33041	42	/*
6d33cd77 AS	43	* According to CS4271 datasheet we use MCLK/LRCK=256 for
6d33cd77 AS	44	* rates below 50kHz and 128 for higher sample rates
86c33041	45	*/
6d33cd77 AS	46	if (rate < 50000)
	47	mclk_rate = rate * 64 * 4;
	48	else
	49	mclk_rate = rate * 64 * 2;
86c33041	50
86c33041 AS	51	err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
	52	SND_SOC_CLOCK_IN);
	53	if (err)
	54	return err;
	55
	56	return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
	57	SND_SOC_CLOCK_OUT);
	58	}
	59
	60	static struct snd_soc_ops edb93xx_ops = {
	61	.hw_params = edb93xx_hw_params,
	62	};
	63
	64	static struct snd_soc_dai_link edb93xx_dai = {
	65	.name = "CS4271",
	66	.stream_name = "CS4271 HiFi",
	67	.platform_name = "ep93xx-pcm-audio",
	68	.cpu_dai_name = "ep93xx-i2s",
	69	.codec_name = "spi0.0",
	70	.codec_dai_name = "cs4271-hifi",
f521812b AL	71	.dai_fmt = SND_SOC_DAIFMT_I2S \| SND_SOC_DAIFMT_NB_IF \|
f521812b AL	72	SND_SOC_DAIFMT_CBS_CFS,
86c33041 AS	73	.ops = &edb93xx_ops,
	74	};
	75
	76	static struct snd_soc_card snd_soc_edb93xx = {
	77	.name = "EDB93XX",
a76a7023	78	.owner = THIS_MODULE,
86c33041 AS	79	.dai_link = &edb93xx_dai,
	80	.num_links = 1,
	81	};
	82
8a386ca2	83	static int __devinit edb93xx_probe(struct platform_device *pdev)
86c33041	84	{
8a386ca2	85	struct snd_soc_card *card = &snd_soc_edb93xx;
86c33041 AS	86	int ret;
86c33041 AS	87
44fb864b	88	ret = ep93xx_i2s_acquire();
86c33041 AS	89	if (ret)
	90	return ret;
	91
8a386ca2 MW	92	card->dev = &pdev->dev;
	93
	94	ret = snd_soc_register_card(card);
	95	if (ret) {
	96	dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
	97	ret);
	98	ep93xx_i2s_release();
86c33041 AS	99	}
86c33041 AS	100
8a386ca2 MW	101	return ret;
8a386ca2 MW	102	}
86c33041	103
8a386ca2 MW	104	static int __devexit edb93xx_remove(struct platform_device *pdev)
	105	{
	106	struct snd_soc_card *card = platform_get_drvdata(pdev);
86c33041	107
8a386ca2	108	snd_soc_unregister_card(card);
86c33041	109	ep93xx_i2s_release();
8a386ca2 MW	110
	111	return 0;
	112	}
	113
	114	static struct platform_driver edb93xx_driver = {
	115	.driver = {
	116	.name = "edb93xx-audio",
	117	.owner = THIS_MODULE,
	118	},
	119	.probe = edb93xx_probe,
	120	.remove = __devexit_p(edb93xx_remove),
	121	};
	122
ee18f631	123	module_platform_driver(edb93xx_driver);
86c33041 AS	124
	125	MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
	126	MODULE_DESCRIPTION("ALSA SoC EDB93xx");
	127	MODULE_LICENSE("GPL");
8a386ca2	128	MODULE_ALIAS("platform:edb93xx-audio");