sound/soc/codecs/ak4642.c - linux/kernel/git/tj/wq - Git at Google

 /*
  * ak4642.c  --  AK4642/AK4643 ALSA Soc Audio driver
  *
  * Copyright (C) 2009 Renesas Solutions Corp.
  * Kuninori Morimoto <morimoto.kuninori@renesas.com>
  *
  * Based on wm8731.c by Richard Purdie
  * Based on ak4535.c by Richard Purdie
  * Based on wm8753.c by Liam Girdwood
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 /* ** CAUTION **
  *
  * This is very simple driver.
  * It can use headphone output / stereo input only
  *
  * AK4642 is not tested.
  * AK4643 is tested.
  */

 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/pm.h>
 #include <linux/i2c.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/soc-dapm.h>
 #include <sound/initval.h>

 #include "ak4642.h"

 #define AK4642_VERSION "0.0.1"

 #define PW_MGMT1	0x00
 #define PW_MGMT2	0x01
 #define SG_SL1		0x02
 #define SG_SL2		0x03
 #define MD_CTL1		0x04
 #define MD_CTL2		0x05
 #define TIMER		0x06
 #define ALC_CTL1	0x07
 #define ALC_CTL2	0x08
 #define L_IVC		0x09
 #define L_DVC		0x0a
 #define ALC_CTL3	0x0b
 #define R_IVC		0x0c
 #define R_DVC		0x0d
 #define MD_CTL3		0x0e
 #define MD_CTL4		0x0f
 #define PW_MGMT3	0x10
 #define DF_S		0x11
 #define FIL3_0		0x12
 #define FIL3_1		0x13
 #define FIL3_2		0x14
 #define FIL3_3		0x15
 #define EQ_0		0x16
 #define EQ_1		0x17
 #define EQ_2		0x18
 #define EQ_3		0x19
 #define EQ_4		0x1a
 #define EQ_5		0x1b
 #define FIL1_0		0x1c
 #define FIL1_1		0x1d
 #define FIL1_2		0x1e
 #define FIL1_3		0x1f
 #define PW_MGMT4	0x20
 #define MD_CTL5		0x21
 #define LO_MS		0x22
 #define HP_MS		0x23
 #define SPK_MS		0x24

 #define AK4642_CACHEREGNUM 	0x25

 struct snd_soc_codec_device soc_codec_dev_ak4642;

 /* codec private data */
 struct ak4642_priv {
 	struct snd_soc_codec codec;
 	unsigned int sysclk;
 };

 static struct snd_soc_codec *ak4642_codec;

 /*
  * ak4642 register cache
  */
 static const u16 ak4642_reg[AK4642_CACHEREGNUM] = {
 	0x0000, 0x0000, 0x0001, 0x0000,
 	0x0002, 0x0000, 0x0000, 0x0000,
 	0x00e1, 0x00e1, 0x0018, 0x0000,
 	0x00e1, 0x0018, 0x0011, 0x0008,
 	0x0000, 0x0000, 0x0000, 0x0000,
 	0x0000, 0x0000, 0x0000, 0x0000,
 	0x0000, 0x0000, 0x0000, 0x0000,
 	0x0000, 0x0000, 0x0000, 0x0000,
 	0x0000, 0x0000, 0x0000, 0x0000,
 	0x0000,
 };

 /*
  * read ak4642 register cache
  */
 static inline unsigned int ak4642_read_reg_cache(struct snd_soc_codec *codec,
 	unsigned int reg)
 {
 	u16 *cache = codec->reg_cache;
 	if (reg >= AK4642_CACHEREGNUM)
 		return -1;
 	return cache[reg];
 }

 /*
  * write ak4642 register cache
  */
 static inline void ak4642_write_reg_cache(struct snd_soc_codec *codec,
 	u16 reg, unsigned int value)
 {
 	u16 *cache = codec->reg_cache;
 	if (reg >= AK4642_CACHEREGNUM)
 		return;

 	cache[reg] = value;
 }

 /*
  * write to the AK4642 register space
  */
 static int ak4642_write(struct snd_soc_codec *codec, unsigned int reg,
 	unsigned int value)
 {
 	u8 data[2];

 	/* data is
 	 *   D15..D8 AK4642 register offset
 	 *   D7...D0 register data
 	 */
 	data[0] = reg & 0xff;
 	data[1] = value & 0xff;

 	if (codec->hw_write(codec->control_data, data, 2) == 2) {
 		ak4642_write_reg_cache(codec, reg, value);
 		return 0;
 	} else
 		return -EIO;
 }

 static int ak4642_sync(struct snd_soc_codec *codec)
 {
 	u16 *cache = codec->reg_cache;
 	int i, r = 0;

 	for (i = 0; i < AK4642_CACHEREGNUM; i++)
 		r |= ak4642_write(codec, i, cache[i]);

 	return r;
 };

 static int ak4642_dai_startup(struct snd_pcm_substream *substream,
 			      struct snd_soc_dai *dai)
 {
 	int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 	struct snd_soc_codec *codec = dai->codec;

 	if (is_play) {
 		/*
 		 * start headphone output
 		 *
 		 * PLL, Master Mode
 		 * Audio I/F Format :MSB justified (ADC & DAC)
 		 * Sampling Frequency: 44.1kHz
 		 * Digital Volume: −8dB
 		 * Bass Boost Level : Middle
 		 *
 		 * This operation came from example code of
 		 * "ASAHI KASEI AK4642" (japanese) manual p97.
 		 *
 		 * Example code use 0x39, 0x79 value for 0x01 address,
 		 * But we need MCKO (0x02) bit now
 		 */
 		ak4642_write(codec, 0x05, 0x27);
 		ak4642_write(codec, 0x0f, 0x09);
 		ak4642_write(codec, 0x0e, 0x19);
 		ak4642_write(codec, 0x09, 0x91);
 		ak4642_write(codec, 0x0c, 0x91);
 		ak4642_write(codec, 0x0a, 0x28);
 		ak4642_write(codec, 0x0d, 0x28);
 		ak4642_write(codec, 0x00, 0x64);
 		ak4642_write(codec, 0x01, 0x3b); /* + MCKO bit */
 		ak4642_write(codec, 0x01, 0x7b); /* + MCKO bit */
 	} else {
 		/*
 		 * start stereo input
 		 *
 		 * PLL Master Mode
 		 * Audio I/F Format:MSB justified (ADC & DAC)
 		 * Sampling Frequency:44.1kHz
 		 * Pre MIC AMP:+20dB
 		 * MIC Power On
 		 * ALC setting:Refer to Table 35
 		 * ALC bit=“1”
 		 *
 		 * This operation came from example code of
 		 * "ASAHI KASEI AK4642" (japanese) manual p94.
 		 */
 		ak4642_write(codec, 0x05, 0x27);
 		ak4642_write(codec, 0x02, 0x05);
 		ak4642_write(codec, 0x06, 0x3c);
 		ak4642_write(codec, 0x08, 0xe1);
 		ak4642_write(codec, 0x0b, 0x00);
 		ak4642_write(codec, 0x07, 0x21);
 		ak4642_write(codec, 0x00, 0x41);
 		ak4642_write(codec, 0x10, 0x01);
 	}

 	return 0;
 }

 static void ak4642_dai_shutdown(struct snd_pcm_substream *substream,
 			       struct snd_soc_dai *dai)
 {
 	int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 	struct snd_soc_codec *codec = dai->codec;

 	if (is_play) {
 		/* stop headphone output */
 		ak4642_write(codec, 0x01, 0x3b);
 		ak4642_write(codec, 0x01, 0x0b);
 		ak4642_write(codec, 0x00, 0x40);
 		ak4642_write(codec, 0x0e, 0x11);
 		ak4642_write(codec, 0x0f, 0x08);
 	} else {
 		/* stop stereo input */
 		ak4642_write(codec, 0x00, 0x40);
 		ak4642_write(codec, 0x10, 0x00);
 		ak4642_write(codec, 0x07, 0x01);
 	}
 }

 static int ak4642_dai_set_sysclk(struct snd_soc_dai *codec_dai,
 	int clk_id, unsigned int freq, int dir)
 {
 	struct snd_soc_codec *codec = codec_dai->codec;
 	struct ak4642_priv *ak4642 = codec->private_data;

 	ak4642->sysclk = freq;
 	return 0;
 }

 static struct snd_soc_dai_ops ak4642_dai_ops = {
 	.startup	= ak4642_dai_startup,
 	.shutdown	= ak4642_dai_shutdown,
 	.set_sysclk	= ak4642_dai_set_sysclk,
 };

 struct snd_soc_dai ak4642_dai = {
 	.name = "AK4642",
 	.playback = {
 		.stream_name = "Playback",
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_8000_48000,
 		.formats = SNDRV_PCM_FMTBIT_S16_LE },
 	.capture = {
 		.stream_name = "Capture",
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_8000_48000,
 		.formats = SNDRV_PCM_FMTBIT_S16_LE },
 	.ops = &ak4642_dai_ops,
 };
 EXPORT_SYMBOL_GPL(ak4642_dai);

 static int ak4642_resume(struct platform_device *pdev)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct snd_soc_codec *codec = socdev->card->codec;

 	ak4642_sync(codec);
 	return 0;
 }

 /*
  * initialise the AK4642 driver
  * register the mixer and dsp interfaces with the kernel
  */
 static int ak4642_init(struct ak4642_priv *ak4642)
 {
 	struct snd_soc_codec *codec = &ak4642->codec;
 	int ret = 0;

 	if (ak4642_codec) {
 		dev_err(codec->dev, "Another ak4642 is registered\n");
 		return -EINVAL;
 	}

 	mutex_init(&codec->mutex);
 	INIT_LIST_HEAD(&codec->dapm_widgets);
 	INIT_LIST_HEAD(&codec->dapm_paths);

 	codec->private_data	= ak4642;
 	codec->name		= "AK4642";
 	codec->owner		= THIS_MODULE;
 	codec->read		= ak4642_read_reg_cache;
 	codec->write		= ak4642_write;
 	codec->dai		= &ak4642_dai;
 	codec->num_dai		= 1;
 	codec->hw_write		= (hw_write_t)i2c_master_send;
 	codec->reg_cache_size	= ARRAY_SIZE(ak4642_reg);
 	codec->reg_cache	= kmemdup(ak4642_reg,
 					  sizeof(ak4642_reg), GFP_KERNEL);

 	if (!codec->reg_cache)
 		return -ENOMEM;

 	ak4642_dai.dev = codec->dev;
 	ak4642_codec = codec;

 	ret = snd_soc_register_codec(codec);
 	if (ret) {
 		dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 		goto reg_cache_err;
 	}

 	ret = snd_soc_register_dai(&ak4642_dai);
 	if (ret) {
 		dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 		snd_soc_unregister_codec(codec);
 		goto reg_cache_err;
 	}

 	/*
 	 * clock setting
 	 *
 	 * Audio I/F Format: MSB justified (ADC & DAC)
 	 * BICK frequency at Master Mode: 64fs
 	 * Input Master Clock Select at PLL Mode: 11.2896MHz
 	 * MCKO: Enable
 	 * Sampling Frequency: 44.1kHz
 	 *
 	 * This operation came from example code of
 	 * "ASAHI KASEI AK4642" (japanese) manual p89.
 	 *
 	 * please fix-me
 	 */
 	ak4642_write(codec, 0x01, 0x08);
 	ak4642_write(codec, 0x04, 0x4a);
 	ak4642_write(codec, 0x05, 0x27);
 	ak4642_write(codec, 0x00, 0x40);
 	ak4642_write(codec, 0x01, 0x0b);

 	return ret;

 reg_cache_err:
 	kfree(codec->reg_cache);
 	codec->reg_cache = NULL;

 	return ret;
 }

 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 static int ak4642_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
 	struct ak4642_priv *ak4642;
 	struct snd_soc_codec *codec;
 	int ret;

 	ak4642 = kzalloc(sizeof(struct ak4642_priv), GFP_KERNEL);
 	if (!ak4642)
 		return -ENOMEM;

 	codec = &ak4642->codec;
 	codec->dev = &i2c->dev;

 	i2c_set_clientdata(i2c, ak4642);
 	codec->control_data = i2c;

 	ret = ak4642_init(ak4642);
 	if (ret < 0)
 		printk(KERN_ERR "failed to initialise AK4642\n");

 	return ret;
 }

 static int ak4642_i2c_remove(struct i2c_client *client)
 {
 	struct ak4642_priv *ak4642 = i2c_get_clientdata(client);

 	snd_soc_unregister_dai(&ak4642_dai);
 	snd_soc_unregister_codec(&ak4642->codec);
 	kfree(ak4642->codec.reg_cache);
 	kfree(ak4642);
 	ak4642_codec = NULL;

 	return 0;
 }

 static const struct i2c_device_id ak4642_i2c_id[] = {
 	{ "ak4642", 0 },
 	{ "ak4643", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, ak4642_i2c_id);

 static struct i2c_driver ak4642_i2c_driver = {
 	.driver = {
 		.name = "AK4642 I2C Codec",
 		.owner = THIS_MODULE,
 	},
 	.probe		= ak4642_i2c_probe,
 	.remove		= ak4642_i2c_remove,
 	.id_table	= ak4642_i2c_id,
 };

 #endif

 static int ak4642_probe(struct platform_device *pdev)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	int ret;

 	if (!ak4642_codec) {
 		dev_err(&pdev->dev, "Codec device not registered\n");
 		return -ENODEV;
 	}

 	socdev->card->codec = ak4642_codec;

 	/* register pcms */
 	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 	if (ret < 0) {
 		printk(KERN_ERR "ak4642: failed to create pcms\n");
 		goto pcm_err;
 	}

 	dev_info(&pdev->dev, "AK4642 Audio Codec %s", AK4642_VERSION);
 	return ret;

 pcm_err:
 	return ret;

 }

 /* power down chip */
 static int ak4642_remove(struct platform_device *pdev)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

 	snd_soc_free_pcms(socdev);
 	snd_soc_dapm_free(socdev);

 	return 0;
 }

 struct snd_soc_codec_device soc_codec_dev_ak4642 = {
 	.probe =	ak4642_probe,
 	.remove =	ak4642_remove,
 	.resume =	ak4642_resume,
 };
 EXPORT_SYMBOL_GPL(soc_codec_dev_ak4642);

 static int __init ak4642_modinit(void)
 {
 	int ret = 0;
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	ret = i2c_add_driver(&ak4642_i2c_driver);
 #endif
 	return ret;

 }
 module_init(ak4642_modinit);

 static void __exit ak4642_exit(void)
 {
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	i2c_del_driver(&ak4642_i2c_driver);
 #endif

 }
 module_exit(ak4642_exit);

 MODULE_DESCRIPTION("Soc AK4642 driver");
 MODULE_AUTHOR("Kuninori Morimoto <morimoto.kuninori@renesas.com>");
 MODULE_LICENSE("GPL");
	/*
	* ak4642.c -- AK4642/AK4643 ALSA Soc Audio driver
	*
	* Copyright (C) 2009 Renesas Solutions Corp.
	* Kuninori Morimoto <morimoto.kuninori@renesas.com>
	*
	* Based on wm8731.c by Richard Purdie
	* Based on ak4535.c by Richard Purdie
	* Based on wm8753.c by Liam Girdwood
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	/* CAUTION
	*
	* This is very simple driver.
	* It can use headphone output / stereo input only
	*
	* AK4642 is not tested.
	* AK4643 is tested.
	*/

	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/pm.h>
	#include <linux/i2c.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/soc-dapm.h>
	#include <sound/initval.h>

	#include "ak4642.h"

	#define AK4642_VERSION "0.0.1"

	#define PW_MGMT1 0x00
	#define PW_MGMT2 0x01
	#define SG_SL1 0x02
	#define SG_SL2 0x03
	#define MD_CTL1 0x04
	#define MD_CTL2 0x05
	#define TIMER 0x06
	#define ALC_CTL1 0x07
	#define ALC_CTL2 0x08
	#define L_IVC 0x09
	#define L_DVC 0x0a
	#define ALC_CTL3 0x0b
	#define R_IVC 0x0c
	#define R_DVC 0x0d
	#define MD_CTL3 0x0e
	#define MD_CTL4 0x0f
	#define PW_MGMT3 0x10
	#define DF_S 0x11
	#define FIL3_0 0x12
	#define FIL3_1 0x13
	#define FIL3_2 0x14
	#define FIL3_3 0x15
	#define EQ_0 0x16
	#define EQ_1 0x17
	#define EQ_2 0x18
	#define EQ_3 0x19
	#define EQ_4 0x1a
	#define EQ_5 0x1b
	#define FIL1_0 0x1c
	#define FIL1_1 0x1d
	#define FIL1_2 0x1e
	#define FIL1_3 0x1f
	#define PW_MGMT4 0x20
	#define MD_CTL5 0x21
	#define LO_MS 0x22
	#define HP_MS 0x23
	#define SPK_MS 0x24

	#define AK4642_CACHEREGNUM 0x25

	struct snd_soc_codec_device soc_codec_dev_ak4642;

	/* codec private data */
	struct ak4642_priv {
	struct snd_soc_codec codec;
	unsigned int sysclk;
	};

	static struct snd_soc_codec *ak4642_codec;

	/*
	* ak4642 register cache
	*/
	static const u16 ak4642_reg[AK4642_CACHEREGNUM] = {
	0x0000, 0x0000, 0x0001, 0x0000,
	0x0002, 0x0000, 0x0000, 0x0000,
	0x00e1, 0x00e1, 0x0018, 0x0000,
	0x00e1, 0x0018, 0x0011, 0x0008,
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0000,
	};

	/*
	* read ak4642 register cache
	*/
	static inline unsigned int ak4642_read_reg_cache(struct snd_soc_codec *codec,
	unsigned int reg)
	{
	u16 *cache = codec->reg_cache;
	if (reg >= AK4642_CACHEREGNUM)
	return -1;
	return cache[reg];
	}

	/*
	* write ak4642 register cache
	*/
	static inline void ak4642_write_reg_cache(struct snd_soc_codec *codec,
	u16 reg, unsigned int value)
	{
	u16 *cache = codec->reg_cache;
	if (reg >= AK4642_CACHEREGNUM)
	return;

	cache[reg] = value;
	}

	/*
	* write to the AK4642 register space
	*/
	static int ak4642_write(struct snd_soc_codec *codec, unsigned int reg,
	unsigned int value)
	{
	u8 data[2];

	/* data is
	* D15..D8 AK4642 register offset
	* D7...D0 register data
	*/
	data[0] = reg & 0xff;
	data[1] = value & 0xff;

	if (codec->hw_write(codec->control_data, data, 2) == 2) {
	ak4642_write_reg_cache(codec, reg, value);
	return 0;
	} else
	return -EIO;
	}

	static int ak4642_sync(struct snd_soc_codec *codec)
	{
	u16 *cache = codec->reg_cache;
	int i, r = 0;

	for (i = 0; i < AK4642_CACHEREGNUM; i++)
	r \|= ak4642_write(codec, i, cache[i]);

	return r;
	};

	static int ak4642_dai_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
	struct snd_soc_codec *codec = dai->codec;

	if (is_play) {
	/*
	* start headphone output
	*
	* PLL, Master Mode
	* Audio I/F Format :MSB justified (ADC & DAC)
	* Sampling Frequency: 44.1kHz
	* Digital Volume: −8dB
	* Bass Boost Level : Middle
	*
	* This operation came from example code of
	* "ASAHI KASEI AK4642" (japanese) manual p97.
	*
	* Example code use 0x39, 0x79 value for 0x01 address,
	* But we need MCKO (0x02) bit now
	*/
	ak4642_write(codec, 0x05, 0x27);
	ak4642_write(codec, 0x0f, 0x09);
	ak4642_write(codec, 0x0e, 0x19);
	ak4642_write(codec, 0x09, 0x91);
	ak4642_write(codec, 0x0c, 0x91);
	ak4642_write(codec, 0x0a, 0x28);
	ak4642_write(codec, 0x0d, 0x28);
	ak4642_write(codec, 0x00, 0x64);
	ak4642_write(codec, 0x01, 0x3b); /* + MCKO bit */
	ak4642_write(codec, 0x01, 0x7b); /* + MCKO bit */
	} else {
	/*
	* start stereo input
	*
	* PLL Master Mode
	* Audio I/F Format:MSB justified (ADC & DAC)
	* Sampling Frequency:44.1kHz
	* Pre MIC AMP:+20dB
	* MIC Power On
	* ALC setting:Refer to Table 35
	* ALC bit=“1”
	*
	* This operation came from example code of
	* "ASAHI KASEI AK4642" (japanese) manual p94.
	*/
	ak4642_write(codec, 0x05, 0x27);
	ak4642_write(codec, 0x02, 0x05);
	ak4642_write(codec, 0x06, 0x3c);
	ak4642_write(codec, 0x08, 0xe1);
	ak4642_write(codec, 0x0b, 0x00);
	ak4642_write(codec, 0x07, 0x21);
	ak4642_write(codec, 0x00, 0x41);
	ak4642_write(codec, 0x10, 0x01);
	}

	return 0;
	}

	static void ak4642_dai_shutdown(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
	struct snd_soc_codec *codec = dai->codec;

	if (is_play) {
	/* stop headphone output */
	ak4642_write(codec, 0x01, 0x3b);
	ak4642_write(codec, 0x01, 0x0b);
	ak4642_write(codec, 0x00, 0x40);
	ak4642_write(codec, 0x0e, 0x11);
	ak4642_write(codec, 0x0f, 0x08);
	} else {
	/* stop stereo input */
	ak4642_write(codec, 0x00, 0x40);
	ak4642_write(codec, 0x10, 0x00);
	ak4642_write(codec, 0x07, 0x01);
	}
	}

	static int ak4642_dai_set_sysclk(struct snd_soc_dai *codec_dai,
	int clk_id, unsigned int freq, int dir)
	{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct ak4642_priv *ak4642 = codec->private_data;

	ak4642->sysclk = freq;
	return 0;
	}

	static struct snd_soc_dai_ops ak4642_dai_ops = {
	.startup = ak4642_dai_startup,
	.shutdown = ak4642_dai_shutdown,
	.set_sysclk = ak4642_dai_set_sysclk,
	};

	struct snd_soc_dai ak4642_dai = {
	.name = "AK4642",
	.playback = {
	.stream_name = "Playback",
	.channels_min = 1,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_48000,
	.formats = SNDRV_PCM_FMTBIT_S16_LE },
	.capture = {
	.stream_name = "Capture",
	.channels_min = 1,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_48000,
	.formats = SNDRV_PCM_FMTBIT_S16_LE },
	.ops = &ak4642_dai_ops,
	};
	EXPORT_SYMBOL_GPL(ak4642_dai);

	static int ak4642_resume(struct platform_device *pdev)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->card->codec;

	ak4642_sync(codec);
	return 0;
	}

	/*
	* initialise the AK4642 driver
	* register the mixer and dsp interfaces with the kernel
	*/
	static int ak4642_init(struct ak4642_priv *ak4642)
	{
	struct snd_soc_codec *codec = &ak4642->codec;
	int ret = 0;

	if (ak4642_codec) {
	dev_err(codec->dev, "Another ak4642 is registered\n");
	return -EINVAL;
	}

	mutex_init(&codec->mutex);
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);

	codec->private_data = ak4642;
	codec->name = "AK4642";
	codec->owner = THIS_MODULE;
	codec->read = ak4642_read_reg_cache;
	codec->write = ak4642_write;
	codec->dai = &ak4642_dai;
	codec->num_dai = 1;
	codec->hw_write = (hw_write_t)i2c_master_send;
	codec->reg_cache_size = ARRAY_SIZE(ak4642_reg);
	codec->reg_cache = kmemdup(ak4642_reg,
	sizeof(ak4642_reg), GFP_KERNEL);

	if (!codec->reg_cache)
	return -ENOMEM;

	ak4642_dai.dev = codec->dev;
	ak4642_codec = codec;

	ret = snd_soc_register_codec(codec);
	if (ret) {
	dev_err(codec->dev, "Failed to register codec: %d\n", ret);
	goto reg_cache_err;
	}

	ret = snd_soc_register_dai(&ak4642_dai);
	if (ret) {
	dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
	snd_soc_unregister_codec(codec);
	goto reg_cache_err;
	}

	/*
	* clock setting
	*
	* Audio I/F Format: MSB justified (ADC & DAC)
	* BICK frequency at Master Mode: 64fs
	* Input Master Clock Select at PLL Mode: 11.2896MHz
	* MCKO: Enable
	* Sampling Frequency: 44.1kHz
	*
	* This operation came from example code of
	* "ASAHI KASEI AK4642" (japanese) manual p89.
	*
	* please fix-me
	*/
	ak4642_write(codec, 0x01, 0x08);
	ak4642_write(codec, 0x04, 0x4a);
	ak4642_write(codec, 0x05, 0x27);
	ak4642_write(codec, 0x00, 0x40);
	ak4642_write(codec, 0x01, 0x0b);

	return ret;

	reg_cache_err:
	kfree(codec->reg_cache);
	codec->reg_cache = NULL;

	return ret;
	}

	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	static int ak4642_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct ak4642_priv *ak4642;
	struct snd_soc_codec *codec;
	int ret;

	ak4642 = kzalloc(sizeof(struct ak4642_priv), GFP_KERNEL);
	if (!ak4642)
	return -ENOMEM;

	codec = &ak4642->codec;
	codec->dev = &i2c->dev;

	i2c_set_clientdata(i2c, ak4642);
	codec->control_data = i2c;

	ret = ak4642_init(ak4642);
	if (ret < 0)
	printk(KERN_ERR "failed to initialise AK4642\n");

	return ret;
	}

	static int ak4642_i2c_remove(struct i2c_client *client)
	{
	struct ak4642_priv *ak4642 = i2c_get_clientdata(client);

	snd_soc_unregister_dai(&ak4642_dai);
	snd_soc_unregister_codec(&ak4642->codec);
	kfree(ak4642->codec.reg_cache);
	kfree(ak4642);
	ak4642_codec = NULL;

	return 0;
	}

	static const struct i2c_device_id ak4642_i2c_id[] = {
	{ "ak4642", 0 },
	{ "ak4643", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, ak4642_i2c_id);

	static struct i2c_driver ak4642_i2c_driver = {
	.driver = {
	.name = "AK4642 I2C Codec",
	.owner = THIS_MODULE,
	},
	.probe = ak4642_i2c_probe,
	.remove = ak4642_i2c_remove,
	.id_table = ak4642_i2c_id,
	};

	#endif

	static int ak4642_probe(struct platform_device *pdev)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	int ret;

	if (!ak4642_codec) {
	dev_err(&pdev->dev, "Codec device not registered\n");
	return -ENODEV;
	}

	socdev->card->codec = ak4642_codec;

	/* register pcms */
	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	if (ret < 0) {
	printk(KERN_ERR "ak4642: failed to create pcms\n");
	goto pcm_err;
	}

	dev_info(&pdev->dev, "AK4642 Audio Codec %s", AK4642_VERSION);
	return ret;

	pcm_err:
	return ret;

	}

	/* power down chip */
	static int ak4642_remove(struct platform_device *pdev)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	snd_soc_free_pcms(socdev);
	snd_soc_dapm_free(socdev);

	return 0;
	}

	struct snd_soc_codec_device soc_codec_dev_ak4642 = {
	.probe = ak4642_probe,
	.remove = ak4642_remove,
	.resume = ak4642_resume,
	};
	EXPORT_SYMBOL_GPL(soc_codec_dev_ak4642);

	static int __init ak4642_modinit(void)
	{
	int ret = 0;
	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	ret = i2c_add_driver(&ak4642_i2c_driver);
	#endif
	return ret;

	}
	module_init(ak4642_modinit);

	static void __exit ak4642_exit(void)
	{
	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	i2c_del_driver(&ak4642_i2c_driver);
	#endif

	}
	module_exit(ak4642_exit);

	MODULE_DESCRIPTION("Soc AK4642 driver");
	MODULE_AUTHOR("Kuninori Morimoto <morimoto.kuninori@renesas.com>");
	MODULE_LICENSE("GPL");