Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit a381934e authored by Daniel Mack's avatar Daniel Mack Committed by Mark Brown
Browse files

ASoC: Add a driver for AK4104 S/PDIF transmitter 



This adds a driver for the SPI connected AK4104 S/PDIF transmitter
device. Its features are fairly simple, but as there is need to set up
certain bits in the IEC958 information, this better goes into a real
driver.

Signed-off-by: default avatarDaniel Mack <daniel@caiaq.de>
Cc: Mark Brown <broonie@sirena.org.uk>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 055a49b0

sound/soc/codecs/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ config SND_SOC_ALL_CODECS 
	select SND_SOC_AC97_CODEC if SND_SOC_AC97_BUS

	select SND_SOC_AD1980 if SND_SOC_AC97_BUS

	select SND_SOC_AD73311 if I2C

	select SND_SOC_AK4104 if SPI_MASTER

	select SND_SOC_AK4535 if I2C

	select SND_SOC_CS4270 if I2C

	select SND_SOC_PCM3008
@@ -60,6 +61,9 @@ config SND_SOC_AD1980 
config SND_SOC_AD73311

	tristate



config SND_SOC_AK4104

	tristate



config SND_SOC_AK4535

	tristate

sound/soc/codecs/Makefile

+2 −0
Original line number Diff line number Diff line 
snd-soc-ac97-objs := ac97.o

snd-soc-ad1980-objs := ad1980.o

snd-soc-ad73311-objs := ad73311.o

snd-soc-ak4104-objs := ak4104.o

snd-soc-ak4535-objs := ak4535.o

snd-soc-cs4270-objs := cs4270.o

snd-soc-l3-objs := l3.o
@@ -30,6 +31,7 @@ snd-soc-wm9713-objs := wm9713.o 
obj-$(CONFIG_SND_SOC_AC97_CODEC)	+= snd-soc-ac97.o

obj-$(CONFIG_SND_SOC_AD1980)	+= snd-soc-ad1980.o

obj-$(CONFIG_SND_SOC_AD73311) += snd-soc-ad73311.o

obj-$(CONFIG_SND_SOC_AK4104)	+= snd-soc-ak4104.o

obj-$(CONFIG_SND_SOC_AK4535)	+= snd-soc-ak4535.o

obj-$(CONFIG_SND_SOC_CS4270)	+= snd-soc-cs4270.o

obj-$(CONFIG_SND_SOC_L3)	+= snd-soc-l3.o

sound/soc/codecs/ak4104.c

0 → 100644
+363 −0
Original line number Diff line number Diff line 
/*

 * AK4104 ALSA SoC (ASoC) driver

 *

 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>

 *

 *  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/module.h>

#include <sound/core.h>

#include <sound/soc.h>

#include <sound/initval.h>

#include <linux/spi/spi.h>

#include <sound/asoundef.h>



#include "ak4104.h"



/* AK4104 registers addresses */

#define AK4104_REG_CONTROL1		0x00

#define AK4104_REG_RESERVED		0x01

#define AK4104_REG_CONTROL2		0x02

#define AK4104_REG_TX			0x03

#define AK4104_REG_CHN_STATUS(x)	((x) + 0x04)

#define AK4104_NUM_REGS			10



#define AK4104_REG_MASK			0x1f

#define AK4104_READ			0xc0

#define AK4104_WRITE			0xe0

#define AK4104_RESERVED_VAL		0x5b



/* Bit masks for AK4104 registers */

#define AK4104_CONTROL1_RSTN		(1 << 0)

#define AK4104_CONTROL1_PW		(1 << 1)

#define AK4104_CONTROL1_DIF0		(1 << 2)

#define AK4104_CONTROL1_DIF1		(1 << 3)



#define AK4104_CONTROL2_SEL0		(1 << 0)

#define AK4104_CONTROL2_SEL1		(1 << 1)

#define AK4104_CONTROL2_MODE		(1 << 2)



#define AK4104_TX_TXE			(1 << 0)

#define AK4104_TX_V			(1 << 1)



#define DRV_NAME "ak4104"



struct ak4104_private {

	struct snd_soc_codec codec;

	u8 reg_cache[AK4104_NUM_REGS];

};



static int ak4104_fill_cache(struct snd_soc_codec *codec)

{

	int i;

	u8 *reg_cache = codec->reg_cache;

	struct spi_device *spi = codec->control_data;



	for (i = 0; i < codec->reg_cache_size; i++) {

		int ret = spi_w8r8(spi, i | AK4104_READ);

		if (ret < 0) {

			dev_err(&spi->dev, "SPI write failure\n");

			return ret;

		}



		reg_cache[i] = ret;

	}



	return 0;

}



static unsigned int ak4104_read_reg_cache(struct snd_soc_codec *codec,

					  unsigned int reg)

{

	u8 *reg_cache = codec->reg_cache;



	if (reg >= codec->reg_cache_size)

		return -EINVAL;



	return reg_cache[reg];

}



static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg,

			    unsigned int value)

{

	u8 *cache = codec->reg_cache;

	struct spi_device *spi = codec->control_data;



	if (reg >= codec->reg_cache_size)

		return -EINVAL;



	reg &= AK4104_REG_MASK;

	reg |= AK4104_WRITE;



	/* only write to the hardware if value has changed */

	if (cache[reg] != value) {

		u8 tmp[2] = { reg, value };

		if (spi_write(spi, tmp, sizeof(tmp))) {

			dev_err(&spi->dev, "SPI write failed\n");

			return -EIO;

		}



		cache[reg] = value;

	}



	return 0;

}



static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,

			      unsigned int format)

{

	struct snd_soc_codec *codec = codec_dai->codec;

	int val = 0;



	val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);

	if (val < 0)

		return val;



	val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1);



	/* set DAI format */

	switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {

	case SND_SOC_DAIFMT_RIGHT_J:

		break;

	case SND_SOC_DAIFMT_LEFT_J:

		val |= AK4104_CONTROL1_DIF0;

		break;

	case SND_SOC_DAIFMT_I2S:

		val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;

		break;

	default:

		dev_err(codec->dev, "invalid dai format\n");

		return -EINVAL;

	}



	/* This device can only be slave */

	if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)

		return -EINVAL;



	return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);

}



static int ak4104_hw_params(struct snd_pcm_substream *substream,

			    struct snd_pcm_hw_params *params,

			    struct snd_soc_dai *dai)

{

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct snd_soc_device *socdev = rtd->socdev;

	struct snd_soc_codec *codec = socdev->card->codec;

	int val = 0;



	/* set the IEC958 bits: consumer mode, no copyright bit */

	val |= IEC958_AES0_CON_NOT_COPYRIGHT;

	ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(0), val);



	val = 0;



	switch (params_rate(params)) {

	case 44100:

		val |= IEC958_AES3_CON_FS_44100;

		break;

	case 48000:

		val |= IEC958_AES3_CON_FS_48000;

		break;

	case 32000:

		val |= IEC958_AES3_CON_FS_32000;

		break;

	default:

		dev_err(codec->dev, "unsupported sampling rate\n");

		return -EINVAL;

	}



	return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val);

}



struct snd_soc_dai ak4104_dai = {

	.name = DRV_NAME,

	.playback = {

		.stream_name = "Playback",

		.channels_min = 2,

		.channels_max = 2,

		.rates = SNDRV_PCM_RATE_44100 |

			 SNDRV_PCM_RATE_48000 |

			 SNDRV_PCM_RATE_32000,

		.formats = SNDRV_PCM_FMTBIT_S16_LE  |

			   SNDRV_PCM_FMTBIT_S24_3LE |

			   SNDRV_PCM_FMTBIT_S24_LE

	},

	.ops = {

		.hw_params = ak4104_hw_params,

		.set_fmt = ak4104_set_dai_fmt,

	}

};



static struct snd_soc_codec *ak4104_codec;



static int ak4104_spi_probe(struct spi_device *spi)

{

	struct snd_soc_codec *codec;

	struct ak4104_private *ak4104;

	int ret, val;



	spi->bits_per_word = 8;

	spi->mode = SPI_MODE_0;

	ret = spi_setup(spi);

	if (ret < 0)

		return ret;



	ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL);

	if (!ak4104) {

		dev_err(&spi->dev, "could not allocate codec\n");

		return -ENOMEM;

	}



	codec = &ak4104->codec;

	mutex_init(&codec->mutex);

	INIT_LIST_HEAD(&codec->dapm_widgets);

	INIT_LIST_HEAD(&codec->dapm_paths);



	codec->dev = &spi->dev;

	codec->name = DRV_NAME;

	codec->owner = THIS_MODULE;

	codec->dai = &ak4104_dai;

	codec->num_dai = 1;

	codec->private_data = ak4104;

	codec->control_data = spi;

	codec->reg_cache = ak4104->reg_cache;

	codec->reg_cache_size = AK4104_NUM_REGS;



	/* read all regs and fill the cache */

	ret = ak4104_fill_cache(codec);

	if (ret < 0) {

		dev_err(&spi->dev, "failed to fill register cache\n");

		return ret;

	}



	/* read the 'reserved' register - according to the datasheet, it

	 * should contain 0x5b. Not a good way to verify the presence of

	 * the device, but there is no hardware ID register. */

	if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) !=

					 AK4104_RESERVED_VAL) {

		ret = -ENODEV;

		goto error_free_codec;

	}



	/* set power-up and non-reset bits */

	val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);

	val |= AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN;

	ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);

	if (ret < 0)

		goto error_free_codec;



	/* enable transmitter */

	val = ak4104_read_reg_cache(codec, AK4104_REG_TX);

	val |= AK4104_TX_TXE;

	ret = ak4104_spi_write(codec, AK4104_REG_TX, val);

	if (ret < 0)

		goto error_free_codec;



	ak4104_codec = codec;

	ret = snd_soc_register_dai(&ak4104_dai);

	if (ret < 0) {

		dev_err(&spi->dev, "failed to register DAI\n");

		goto error_free_codec;

	}



	spi_set_drvdata(spi, ak4104);

	dev_info(&spi->dev, "SPI device initialized\n");

	return 0;



error_free_codec:

	kfree(ak4104);

	ak4104_dai.dev = NULL;

	return ret;

}



static int __devexit ak4104_spi_remove(struct spi_device *spi)

{

	int ret, val;

	struct ak4104_private *ak4104 = spi_get_drvdata(spi);



	val = ak4104_read_reg_cache(&ak4104->codec, AK4104_REG_CONTROL1);

	if (val < 0)

		return val;



	/* clear power-up and non-reset bits */

	val &= ~(AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);

	ret = ak4104_spi_write(&ak4104->codec, AK4104_REG_CONTROL1, val);

	if (ret < 0)

		return ret;



	ak4104_codec = NULL;

	kfree(ak4104);

	return 0;

}



static int ak4104_probe(struct platform_device *pdev)

{

	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	struct snd_soc_codec *codec = ak4104_codec;

	int ret;



	/* Connect the codec to the socdev.  snd_soc_new_pcms() needs this. */

	socdev->card->codec = codec;



	/* Register PCMs */

	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);

	if (ret < 0) {

		dev_err(codec->dev, "failed to create pcms\n");

		return ret;

	}



	/* Register the socdev */

	ret = snd_soc_init_card(socdev);

	if (ret < 0) {

		dev_err(codec->dev, "failed to register card\n");

		snd_soc_free_pcms(socdev);

		return ret;

	}



	return 0;

}



static int ak4104_remove(struct platform_device *pdev)

{

	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	snd_soc_free_pcms(socdev);

	return 0;

};



struct snd_soc_codec_device soc_codec_device_ak4104 = {

	.probe = 	ak4104_probe,

	.remove = 	ak4104_remove

};

EXPORT_SYMBOL_GPL(soc_codec_device_ak4104);



static struct spi_driver ak4104_spi_driver = {

	.driver  = {

		.name   = DRV_NAME,

		.owner  = THIS_MODULE,

	},

	.probe  = ak4104_spi_probe,

	.remove = __devexit_p(ak4104_spi_remove),

};



static int __init ak4104_init(void)

{

	pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n");

	return spi_register_driver(&ak4104_spi_driver);

}

module_init(ak4104_init);



static void __exit ak4104_exit(void)

{

	spi_unregister_driver(&ak4104_spi_driver);

}

module_exit(ak4104_exit);



MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");

MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");

MODULE_LICENSE("GPL");

sound/soc/codecs/ak4104.h

0 → 100644
+7 −0
Original line number Diff line number Diff line 
#ifndef _AK4104_H

#define _AK4104_H



extern struct snd_soc_dai ak4104_dai;

extern struct snd_soc_codec_device soc_codec_device_ak4104;



#endif