sound/soc/codecs/ad1836.c - kernel/msm-4.9 - Gitiles

 /*
  * File:         sound/soc/codecs/ad1836.c
  * Author:       Barry Song <Barry.Song@analog.com>
  *
  * Created:      Aug 04 2009
  * Description:  Driver for AD1836 sound chip
  *
  * Modified:
  *               Copyright 2009 Analog Devices Inc.
  *
  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  *
  * 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/init.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/device.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/initval.h>
 #include <sound/soc.h>
 #include <sound/tlv.h>
 #include <sound/soc-dapm.h>
 #include <linux/spi/spi.h>
 #include "ad1836.h"

 /* codec private data */
 struct ad1836_priv {
 	struct snd_soc_codec codec;
 	u16 reg_cache[AD1836_NUM_REGS];
 };

 static struct snd_soc_codec *ad1836_codec;
 struct snd_soc_codec_device soc_codec_dev_ad1836;
 static int ad1836_register(struct ad1836_priv *ad1836);
 static void ad1836_unregister(struct ad1836_priv *ad1836);

 /*
  * AD1836 volume/mute/de-emphasis etc. controls
  */
 static const char *ad1836_deemp[] = {"None", "44.1kHz", "32kHz", "48kHz"};

 static const struct soc_enum ad1836_deemp_enum =
 	SOC_ENUM_SINGLE(AD1836_DAC_CTRL1, 8, 4, ad1836_deemp);

 static const struct snd_kcontrol_new ad1836_snd_controls[] = {
 	/* DAC volume control */
 	SOC_DOUBLE_R("DAC1 Volume", AD1836_DAC_L1_VOL,
 			AD1836_DAC_R1_VOL, 0, 0x3FF, 0),
 	SOC_DOUBLE_R("DAC2 Volume", AD1836_DAC_L2_VOL,
 			AD1836_DAC_R2_VOL, 0, 0x3FF, 0),
 	SOC_DOUBLE_R("DAC3 Volume", AD1836_DAC_L3_VOL,
 			AD1836_DAC_R3_VOL, 0, 0x3FF, 0),

 	/* ADC switch control */
 	SOC_DOUBLE("ADC1 Switch", AD1836_ADC_CTRL2, AD1836_ADCL1_MUTE,
 		AD1836_ADCR1_MUTE, 1, 1),
 	SOC_DOUBLE("ADC2 Switch", AD1836_ADC_CTRL2, AD1836_ADCL2_MUTE,
 		AD1836_ADCR2_MUTE, 1, 1),

 	/* DAC switch control */
 	SOC_DOUBLE("DAC1 Switch", AD1836_DAC_CTRL2, AD1836_DACL1_MUTE,
 		AD1836_DACR1_MUTE, 1, 1),
 	SOC_DOUBLE("DAC2 Switch", AD1836_DAC_CTRL2, AD1836_DACL2_MUTE,
 		AD1836_DACR2_MUTE, 1, 1),
 	SOC_DOUBLE("DAC3 Switch", AD1836_DAC_CTRL2, AD1836_DACL3_MUTE,
 		AD1836_DACR3_MUTE, 1, 1),

 	/* ADC high-pass filter */
 	SOC_SINGLE("ADC High Pass Filter Switch", AD1836_ADC_CTRL1,
 			AD1836_ADC_HIGHPASS_FILTER, 1, 0),

 	/* DAC de-emphasis */
 	SOC_ENUM("Playback Deemphasis", ad1836_deemp_enum),
 };

 static const struct snd_soc_dapm_widget ad1836_dapm_widgets[] = {
 	SND_SOC_DAPM_DAC("DAC", "Playback", AD1836_DAC_CTRL1,
 				AD1836_DAC_POWERDOWN, 1),
 	SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
 	SND_SOC_DAPM_SUPPLY("ADC_PWR", AD1836_ADC_CTRL1,
 				AD1836_ADC_POWERDOWN, 1, NULL, 0),
 	SND_SOC_DAPM_OUTPUT("DAC1OUT"),
 	SND_SOC_DAPM_OUTPUT("DAC2OUT"),
 	SND_SOC_DAPM_OUTPUT("DAC3OUT"),
 	SND_SOC_DAPM_INPUT("ADC1IN"),
 	SND_SOC_DAPM_INPUT("ADC2IN"),
 };

 static const struct snd_soc_dapm_route audio_paths[] = {
 	{ "DAC", NULL, "ADC_PWR" },
 	{ "ADC", NULL, "ADC_PWR" },
 	{ "DAC1OUT", "DAC1 Switch", "DAC" },
 	{ "DAC2OUT", "DAC2 Switch", "DAC" },
 	{ "DAC3OUT", "DAC3 Switch", "DAC" },
 	{ "ADC", "ADC1 Switch", "ADC1IN" },
 	{ "ADC", "ADC2 Switch", "ADC2IN" },
 };

 /*
  * DAI ops entries
  */

 static int ad1836_set_dai_fmt(struct snd_soc_dai *codec_dai,
 		unsigned int fmt)
 {
 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	/* at present, we support adc aux mode to interface with
 	 * blackfin sport tdm mode
 	 */
 	case SND_SOC_DAIFMT_DSP_A:
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_IB_IF:
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	/* ALCLK,ABCLK are both output, AD1836 can only be master */
 	case SND_SOC_DAIFMT_CBM_CFM:
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int ad1836_hw_params(struct snd_pcm_substream *substream,
 		struct snd_pcm_hw_params *params,
 		struct snd_soc_dai *dai)
 {
 	int word_len = 0;

 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_device *socdev = rtd->socdev;
 	struct snd_soc_codec *codec = socdev->card->codec;

 	/* bit size */
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		word_len = 3;
 		break;
 	case SNDRV_PCM_FORMAT_S20_3LE:
 		word_len = 1;
 		break;
 	case SNDRV_PCM_FORMAT_S24_LE:
 	case SNDRV_PCM_FORMAT_S32_LE:
 		word_len = 0;
 		break;
 	}

 	snd_soc_update_bits(codec, AD1836_DAC_CTRL1,
 		AD1836_DAC_WORD_LEN_MASK, word_len);

 	snd_soc_update_bits(codec, AD1836_ADC_CTRL2,
 		AD1836_ADC_WORD_LEN_MASK, word_len);

 	return 0;
 }


 /*
  * interface to read/write ad1836 register
  */
 #define AD1836_SPI_REG_SHFT 12
 #define AD1836_SPI_READ     (1 << 11)
 #define AD1836_SPI_VAL_MSK  0x3FF

 /*
  * write to the ad1836 register space
  */

 static int ad1836_write_reg(struct snd_soc_codec *codec, unsigned int reg,
 		unsigned int value)
 {
 	u16 *reg_cache = codec->reg_cache;
 	int ret = 0;

 	if (value != reg_cache[reg]) {
 		unsigned short buf;
 		struct spi_transfer t = {
 			.tx_buf = &buf,
 			.len = 2,
 		};
 		struct spi_message m;

 		buf = (reg << AD1836_SPI_REG_SHFT) |
 			(value & AD1836_SPI_VAL_MSK);
 		spi_message_init(&m);
 		spi_message_add_tail(&t, &m);
 		ret = spi_sync(codec->control_data, &m);
 		if (ret == 0)
 			reg_cache[reg] = value;
 	}

 	return ret;
 }

 /*
  * read from the ad1836 register space cache
  */
 static unsigned int ad1836_read_reg_cache(struct snd_soc_codec *codec,
 					  unsigned int reg)
 {
 	u16 *reg_cache = codec->reg_cache;

 	if (reg >= codec->reg_cache_size)
 		return -EINVAL;

 	return reg_cache[reg];
 }

 static int __devinit ad1836_spi_probe(struct spi_device *spi)
 {
 	struct snd_soc_codec *codec;
 	struct ad1836_priv *ad1836;

 	ad1836 = kzalloc(sizeof(struct ad1836_priv), GFP_KERNEL);
 	if (ad1836 == NULL)
 		return -ENOMEM;

 	codec = &ad1836->codec;
 	codec->control_data = spi;
 	codec->dev = &spi->dev;

 	dev_set_drvdata(&spi->dev, ad1836);

 	return ad1836_register(ad1836);
 }

 static int __devexit ad1836_spi_remove(struct spi_device *spi)
 {
 	struct ad1836_priv *ad1836 = dev_get_drvdata(&spi->dev);

 	ad1836_unregister(ad1836);
 	return 0;
 }

 static struct spi_driver ad1836_spi_driver = {
 	.driver = {
 		.name	= "ad1836",
 		.owner	= THIS_MODULE,
 	},
 	.probe		= ad1836_spi_probe,
 	.remove		= __devexit_p(ad1836_spi_remove),
 };

 static struct snd_soc_dai_ops ad1836_dai_ops = {
 	.hw_params = ad1836_hw_params,
 	.set_fmt = ad1836_set_dai_fmt,
 };

 /* codec DAI instance */
 struct snd_soc_dai ad1836_dai = {
 	.name = "AD1836",
 	.playback = {
 		.stream_name = "Playback",
 		.channels_min = 2,
 		.channels_max = 6,
 		.rates = SNDRV_PCM_RATE_48000,
 		.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
 			SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
 	},
 	.capture = {
 		.stream_name = "Capture",
 		.channels_min = 2,
 		.channels_max = 4,
 		.rates = SNDRV_PCM_RATE_48000,
 		.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
 			SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
 	},
 	.ops = &ad1836_dai_ops,
 };
 EXPORT_SYMBOL_GPL(ad1836_dai);

 static int ad1836_register(struct ad1836_priv *ad1836)
 {
 	int ret;
 	struct snd_soc_codec *codec = &ad1836->codec;

 	if (ad1836_codec) {
 		dev_err(codec->dev, "Another ad1836 is registered\n");
 		return -EINVAL;
 	}

 	mutex_init(&codec->mutex);
 	INIT_LIST_HEAD(&codec->dapm_widgets);
 	INIT_LIST_HEAD(&codec->dapm_paths);
 	codec->private_data = ad1836;
 	codec->reg_cache = ad1836->reg_cache;
 	codec->reg_cache_size = AD1836_NUM_REGS;
 	codec->name = "AD1836";
 	codec->owner = THIS_MODULE;
 	codec->dai = &ad1836_dai;
 	codec->num_dai = 1;
 	codec->write = ad1836_write_reg;
 	codec->read = ad1836_read_reg_cache;
 	INIT_LIST_HEAD(&codec->dapm_widgets);
 	INIT_LIST_HEAD(&codec->dapm_paths);

 	ad1836_dai.dev = codec->dev;
 	ad1836_codec = codec;

 	/* default setting for ad1836 */
 	/* de-emphasis: 48kHz, power-on dac */
 	codec->write(codec, AD1836_DAC_CTRL1, 0x300);
 	/* unmute dac channels */
 	codec->write(codec, AD1836_DAC_CTRL2, 0x0);
 	/* high-pass filter enable, power-on adc */
 	codec->write(codec, AD1836_ADC_CTRL1, 0x100);
 	/* unmute adc channles, adc aux mode */
 	codec->write(codec, AD1836_ADC_CTRL2, 0x180);
 	/* left/right diff:PGA/MUX */
 	codec->write(codec, AD1836_ADC_CTRL3, 0x3A);
 	/* volume */
 	codec->write(codec, AD1836_DAC_L1_VOL, 0x3FF);
 	codec->write(codec, AD1836_DAC_R1_VOL, 0x3FF);
 	codec->write(codec, AD1836_DAC_L2_VOL, 0x3FF);
 	codec->write(codec, AD1836_DAC_R2_VOL, 0x3FF);
 	codec->write(codec, AD1836_DAC_L3_VOL, 0x3FF);
 	codec->write(codec, AD1836_DAC_R3_VOL, 0x3FF);

 	ret = snd_soc_register_codec(codec);
 	if (ret != 0) {
 		dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 		kfree(ad1836);
 		return ret;
 	}

 	ret = snd_soc_register_dai(&ad1836_dai);
 	if (ret != 0) {
 		dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 		snd_soc_unregister_codec(codec);
 		kfree(ad1836);
 		return ret;
 	}

 	return 0;
 }

 static void ad1836_unregister(struct ad1836_priv *ad1836)
 {
 	snd_soc_unregister_dai(&ad1836_dai);
 	snd_soc_unregister_codec(&ad1836->codec);
 	kfree(ad1836);
 	ad1836_codec = NULL;
 }

 static int ad1836_probe(struct platform_device *pdev)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct snd_soc_codec *codec;
 	int ret = 0;

 	if (ad1836_codec == NULL) {
 		dev_err(&pdev->dev, "Codec device not registered\n");
 		return -ENODEV;
 	}

 	socdev->card->codec = ad1836_codec;
 	codec = ad1836_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: %d\n", ret);
 		goto pcm_err;
 	}

 	snd_soc_add_controls(codec, ad1836_snd_controls,
 			     ARRAY_SIZE(ad1836_snd_controls));
 	snd_soc_dapm_new_controls(codec, ad1836_dapm_widgets,
 				  ARRAY_SIZE(ad1836_dapm_widgets));
 	snd_soc_dapm_add_routes(codec, audio_paths, ARRAY_SIZE(audio_paths));

 pcm_err:
 	return ret;
 }

 /* power down chip */
 static int ad1836_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_ad1836 = {
 	.probe = 	ad1836_probe,
 	.remove = 	ad1836_remove,
 };
 EXPORT_SYMBOL_GPL(soc_codec_dev_ad1836);

 static int __init ad1836_init(void)
 {
 	int ret;

 	ret = spi_register_driver(&ad1836_spi_driver);
 	if (ret != 0) {
 		printk(KERN_ERR "Failed to register ad1836 SPI driver: %d\n",
 				ret);
 	}

 	return ret;
 }
 module_init(ad1836_init);

 static void __exit ad1836_exit(void)
 {
 	spi_unregister_driver(&ad1836_spi_driver);
 }
 module_exit(ad1836_exit);

 MODULE_DESCRIPTION("ASoC ad1836 driver");
 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 MODULE_LICENSE("GPL");
	/*
	* File: sound/soc/codecs/ad1836.c
	* Author: Barry Song <Barry.Song@analog.com>
	*
	* Created: Aug 04 2009
	* Description: Driver for AD1836 sound chip
	*
	* Modified:
	* Copyright 2009 Analog Devices Inc.
	*
	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	*
	* 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/init.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/device.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/initval.h>
	#include <sound/soc.h>
	#include <sound/tlv.h>
	#include <sound/soc-dapm.h>
	#include <linux/spi/spi.h>
	#include "ad1836.h"

	/* codec private data */
	struct ad1836_priv {
	struct snd_soc_codec codec;
	u16 reg_cache[AD1836_NUM_REGS];
	};

	static struct snd_soc_codec *ad1836_codec;
	struct snd_soc_codec_device soc_codec_dev_ad1836;
	static int ad1836_register(struct ad1836_priv *ad1836);
	static void ad1836_unregister(struct ad1836_priv *ad1836);

	/*
	* AD1836 volume/mute/de-emphasis etc. controls
	*/
	static const char *ad1836_deemp[] = {"None", "44.1kHz", "32kHz", "48kHz"};

	static const struct soc_enum ad1836_deemp_enum =
	SOC_ENUM_SINGLE(AD1836_DAC_CTRL1, 8, 4, ad1836_deemp);

	static const struct snd_kcontrol_new ad1836_snd_controls[] = {
	/* DAC volume control */
	SOC_DOUBLE_R("DAC1 Volume", AD1836_DAC_L1_VOL,
	AD1836_DAC_R1_VOL, 0, 0x3FF, 0),
	SOC_DOUBLE_R("DAC2 Volume", AD1836_DAC_L2_VOL,
	AD1836_DAC_R2_VOL, 0, 0x3FF, 0),
	SOC_DOUBLE_R("DAC3 Volume", AD1836_DAC_L3_VOL,
	AD1836_DAC_R3_VOL, 0, 0x3FF, 0),

	/* ADC switch control */
	SOC_DOUBLE("ADC1 Switch", AD1836_ADC_CTRL2, AD1836_ADCL1_MUTE,
	AD1836_ADCR1_MUTE, 1, 1),
	SOC_DOUBLE("ADC2 Switch", AD1836_ADC_CTRL2, AD1836_ADCL2_MUTE,
	AD1836_ADCR2_MUTE, 1, 1),

	/* DAC switch control */
	SOC_DOUBLE("DAC1 Switch", AD1836_DAC_CTRL2, AD1836_DACL1_MUTE,
	AD1836_DACR1_MUTE, 1, 1),
	SOC_DOUBLE("DAC2 Switch", AD1836_DAC_CTRL2, AD1836_DACL2_MUTE,
	AD1836_DACR2_MUTE, 1, 1),
	SOC_DOUBLE("DAC3 Switch", AD1836_DAC_CTRL2, AD1836_DACL3_MUTE,
	AD1836_DACR3_MUTE, 1, 1),

	/* ADC high-pass filter */
	SOC_SINGLE("ADC High Pass Filter Switch", AD1836_ADC_CTRL1,
	AD1836_ADC_HIGHPASS_FILTER, 1, 0),

	/* DAC de-emphasis */
	SOC_ENUM("Playback Deemphasis", ad1836_deemp_enum),
	};

	static const struct snd_soc_dapm_widget ad1836_dapm_widgets[] = {
	SND_SOC_DAPM_DAC("DAC", "Playback", AD1836_DAC_CTRL1,
	AD1836_DAC_POWERDOWN, 1),
	SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_SUPPLY("ADC_PWR", AD1836_ADC_CTRL1,
	AD1836_ADC_POWERDOWN, 1, NULL, 0),
	SND_SOC_DAPM_OUTPUT("DAC1OUT"),
	SND_SOC_DAPM_OUTPUT("DAC2OUT"),
	SND_SOC_DAPM_OUTPUT("DAC3OUT"),
	SND_SOC_DAPM_INPUT("ADC1IN"),
	SND_SOC_DAPM_INPUT("ADC2IN"),
	};

	static const struct snd_soc_dapm_route audio_paths[] = {
	{ "DAC", NULL, "ADC_PWR" },
	{ "ADC", NULL, "ADC_PWR" },
	{ "DAC1OUT", "DAC1 Switch", "DAC" },
	{ "DAC2OUT", "DAC2 Switch", "DAC" },
	{ "DAC3OUT", "DAC3 Switch", "DAC" },
	{ "ADC", "ADC1 Switch", "ADC1IN" },
	{ "ADC", "ADC2 Switch", "ADC2IN" },
	};

	/*
	* DAI ops entries
	*/

	static int ad1836_set_dai_fmt(struct snd_soc_dai *codec_dai,
	unsigned int fmt)
	{
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	/* at present, we support adc aux mode to interface with
	* blackfin sport tdm mode
	*/
	case SND_SOC_DAIFMT_DSP_A:
	break;
	default:
	return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_IB_IF:
	break;
	default:
	return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	/* ALCLK,ABCLK are both output, AD1836 can only be master */
	case SND_SOC_DAIFMT_CBM_CFM:
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int ad1836_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
	{
	int word_len = 0;

	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_device *socdev = rtd->socdev;
	struct snd_soc_codec *codec = socdev->card->codec;

	/* bit size */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	word_len = 3;
	break;
	case SNDRV_PCM_FORMAT_S20_3LE:
	word_len = 1;
	break;
	case SNDRV_PCM_FORMAT_S24_LE:
	case SNDRV_PCM_FORMAT_S32_LE:
	word_len = 0;
	break;
	}

	snd_soc_update_bits(codec, AD1836_DAC_CTRL1,
	AD1836_DAC_WORD_LEN_MASK, word_len);

	snd_soc_update_bits(codec, AD1836_ADC_CTRL2,
	AD1836_ADC_WORD_LEN_MASK, word_len);

	return 0;
	}


	/*
	* interface to read/write ad1836 register
	*/
	#define AD1836_SPI_REG_SHFT 12
	#define AD1836_SPI_READ (1 << 11)
	#define AD1836_SPI_VAL_MSK 0x3FF

	/*
	* write to the ad1836 register space
	*/

	static int ad1836_write_reg(struct snd_soc_codec *codec, unsigned int reg,
	unsigned int value)
	{
	u16 *reg_cache = codec->reg_cache;
	int ret = 0;

	if (value != reg_cache[reg]) {
	unsigned short buf;
	struct spi_transfer t = {
	.tx_buf = &buf,
	.len = 2,
	};
	struct spi_message m;

	buf = (reg << AD1836_SPI_REG_SHFT) \|
	(value & AD1836_SPI_VAL_MSK);
	spi_message_init(&m);
	spi_message_add_tail(&t, &m);
	ret = spi_sync(codec->control_data, &m);
	if (ret == 0)
	reg_cache[reg] = value;
	}

	return ret;
	}

	/*
	* read from the ad1836 register space cache
	*/
	static unsigned int ad1836_read_reg_cache(struct snd_soc_codec *codec,
	unsigned int reg)
	{
	u16 *reg_cache = codec->reg_cache;

	if (reg >= codec->reg_cache_size)
	return -EINVAL;

	return reg_cache[reg];
	}

	static int __devinit ad1836_spi_probe(struct spi_device *spi)
	{
	struct snd_soc_codec *codec;
	struct ad1836_priv *ad1836;

	ad1836 = kzalloc(sizeof(struct ad1836_priv), GFP_KERNEL);
	if (ad1836 == NULL)
	return -ENOMEM;

	codec = &ad1836->codec;
	codec->control_data = spi;
	codec->dev = &spi->dev;

	dev_set_drvdata(&spi->dev, ad1836);

	return ad1836_register(ad1836);
	}

	static int __devexit ad1836_spi_remove(struct spi_device *spi)
	{
	struct ad1836_priv *ad1836 = dev_get_drvdata(&spi->dev);

	ad1836_unregister(ad1836);
	return 0;
	}

	static struct spi_driver ad1836_spi_driver = {
	.driver = {
	.name = "ad1836",
	.owner = THIS_MODULE,
	},
	.probe = ad1836_spi_probe,
	.remove = __devexit_p(ad1836_spi_remove),
	};

	static struct snd_soc_dai_ops ad1836_dai_ops = {
	.hw_params = ad1836_hw_params,
	.set_fmt = ad1836_set_dai_fmt,
	};

	/* codec DAI instance */
	struct snd_soc_dai ad1836_dai = {
	.name = "AD1836",
	.playback = {
	.stream_name = "Playback",
	.channels_min = 2,
	.channels_max = 6,
	.rates = SNDRV_PCM_RATE_48000,
	.formats = SNDRV_PCM_FMTBIT_S32_LE \| SNDRV_PCM_FMTBIT_S16_LE \|
	SNDRV_PCM_FMTBIT_S20_3LE \| SNDRV_PCM_FMTBIT_S24_LE,
	},
	.capture = {
	.stream_name = "Capture",
	.channels_min = 2,
	.channels_max = 4,
	.rates = SNDRV_PCM_RATE_48000,
	.formats = SNDRV_PCM_FMTBIT_S32_LE \| SNDRV_PCM_FMTBIT_S16_LE \|
	SNDRV_PCM_FMTBIT_S20_3LE \| SNDRV_PCM_FMTBIT_S24_LE,
	},
	.ops = &ad1836_dai_ops,
	};
	EXPORT_SYMBOL_GPL(ad1836_dai);

	static int ad1836_register(struct ad1836_priv *ad1836)
	{
	int ret;
	struct snd_soc_codec *codec = &ad1836->codec;

	if (ad1836_codec) {
	dev_err(codec->dev, "Another ad1836 is registered\n");
	return -EINVAL;
	}

	mutex_init(&codec->mutex);
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);
	codec->private_data = ad1836;
	codec->reg_cache = ad1836->reg_cache;
	codec->reg_cache_size = AD1836_NUM_REGS;
	codec->name = "AD1836";
	codec->owner = THIS_MODULE;
	codec->dai = &ad1836_dai;
	codec->num_dai = 1;
	codec->write = ad1836_write_reg;
	codec->read = ad1836_read_reg_cache;
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);

	ad1836_dai.dev = codec->dev;
	ad1836_codec = codec;

	/* default setting for ad1836 */
	/* de-emphasis: 48kHz, power-on dac */
	codec->write(codec, AD1836_DAC_CTRL1, 0x300);
	/* unmute dac channels */
	codec->write(codec, AD1836_DAC_CTRL2, 0x0);
	/* high-pass filter enable, power-on adc */
	codec->write(codec, AD1836_ADC_CTRL1, 0x100);
	/* unmute adc channles, adc aux mode */
	codec->write(codec, AD1836_ADC_CTRL2, 0x180);
	/* left/right diff:PGA/MUX */
	codec->write(codec, AD1836_ADC_CTRL3, 0x3A);
	/* volume */
	codec->write(codec, AD1836_DAC_L1_VOL, 0x3FF);
	codec->write(codec, AD1836_DAC_R1_VOL, 0x3FF);
	codec->write(codec, AD1836_DAC_L2_VOL, 0x3FF);
	codec->write(codec, AD1836_DAC_R2_VOL, 0x3FF);
	codec->write(codec, AD1836_DAC_L3_VOL, 0x3FF);
	codec->write(codec, AD1836_DAC_R3_VOL, 0x3FF);

	ret = snd_soc_register_codec(codec);
	if (ret != 0) {
	dev_err(codec->dev, "Failed to register codec: %d\n", ret);
	kfree(ad1836);
	return ret;
	}

	ret = snd_soc_register_dai(&ad1836_dai);
	if (ret != 0) {
	dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
	snd_soc_unregister_codec(codec);
	kfree(ad1836);
	return ret;
	}

	return 0;
	}

	static void ad1836_unregister(struct ad1836_priv *ad1836)
	{
	snd_soc_unregister_dai(&ad1836_dai);
	snd_soc_unregister_codec(&ad1836->codec);
	kfree(ad1836);
	ad1836_codec = NULL;
	}

	static int ad1836_probe(struct platform_device *pdev)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec;
	int ret = 0;

	if (ad1836_codec == NULL) {
	dev_err(&pdev->dev, "Codec device not registered\n");
	return -ENODEV;
	}

	socdev->card->codec = ad1836_codec;
	codec = ad1836_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: %d\n", ret);
	goto pcm_err;
	}

	snd_soc_add_controls(codec, ad1836_snd_controls,
	ARRAY_SIZE(ad1836_snd_controls));
	snd_soc_dapm_new_controls(codec, ad1836_dapm_widgets,
	ARRAY_SIZE(ad1836_dapm_widgets));
	snd_soc_dapm_add_routes(codec, audio_paths, ARRAY_SIZE(audio_paths));

	pcm_err:
	return ret;
	}

	/* power down chip */
	static int ad1836_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_ad1836 = {
	.probe = ad1836_probe,
	.remove = ad1836_remove,
	};
	EXPORT_SYMBOL_GPL(soc_codec_dev_ad1836);

	static int __init ad1836_init(void)
	{
	int ret;

	ret = spi_register_driver(&ad1836_spi_driver);
	if (ret != 0) {
	printk(KERN_ERR "Failed to register ad1836 SPI driver: %d\n",
	ret);
	}

	return ret;
	}
	module_init(ad1836_init);

	static void __exit ad1836_exit(void)
	{
	spi_unregister_driver(&ad1836_spi_driver);
	}
	module_exit(ad1836_exit);

	MODULE_DESCRIPTION("ASoC ad1836 driver");
	MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
	MODULE_LICENSE("GPL");