sound/soc/codecs/ak4104.c - kernel/prism - Git at Google

 /*
  * 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;

 	/* only write to the hardware if value has changed */
 	if (cache[reg] != value) {
 		u8 tmp[2] = { (reg & AK4104_REG_MASK) | AK4104_WRITE, 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);
 }

 static struct snd_soc_dai_ops ak4101_dai_ops = {
 	.hw_params = ak4104_hw_params,
 	.set_fmt = ak4104_set_dai_fmt,
 };

 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 = &ak4101_dai_ops,
 };

 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");
	/*
	* 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;

	/* only write to the hardware if value has changed */
	if (cache[reg] != value) {
	u8 tmp[2] = { (reg & AK4104_REG_MASK) \| AK4104_WRITE, 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);
	}

	static struct snd_soc_dai_ops ak4101_dai_ops = {
	.hw_params = ak4104_hw_params,
	.set_fmt = ak4104_set_dai_fmt,
	};

	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 = &ak4101_dai_ops,
	};

	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");