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

  /*
  * Audio Codec driver supporting:
  *  AD1835A, AD1836, AD1837A, AD1838A, AD1839A
  *
  * Copyright 2009-2011 Analog Devices Inc.
  *
  * Licensed under the GPL-2 or later.
  */

 #include <linux/init.h>
 #include <linux/slab.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 <linux/spi/spi.h>
 #include "ad1836.h"

 enum ad1836_type {
 	AD1835,
 	AD1836,
 	AD1838,
 };

 /* codec private data */
 struct ad1836_priv {
 	enum ad1836_type type;
 };

 /*
  * 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);

 #define AD1836_DAC_VOLUME(x) \
 	SOC_DOUBLE_R("DAC" #x " Playback Volume", AD1836_DAC_L_VOL(x), \
 			AD1836_DAC_R_VOL(x), 0, 0x3FF, 0)

 #define AD1836_DAC_SWITCH(x) \
 	SOC_DOUBLE("DAC" #x " Playback Switch", AD1836_DAC_CTRL2, \
 			AD1836_MUTE_LEFT(x), AD1836_MUTE_RIGHT(x), 1, 1)

 #define AD1836_ADC_SWITCH(x) \
 	SOC_DOUBLE("ADC" #x " Capture Switch", AD1836_ADC_CTRL2, \
 		AD1836_MUTE_LEFT(x), AD1836_MUTE_RIGHT(x), 1, 1)

 static const struct snd_kcontrol_new ad183x_dac_controls[] = {
 	AD1836_DAC_VOLUME(1),
 	AD1836_DAC_SWITCH(1),
 	AD1836_DAC_VOLUME(2),
 	AD1836_DAC_SWITCH(2),
 	AD1836_DAC_VOLUME(3),
 	AD1836_DAC_SWITCH(3),
 	AD1836_DAC_VOLUME(4),
 	AD1836_DAC_SWITCH(4),
 };

 static const struct snd_soc_dapm_widget ad183x_dac_dapm_widgets[] = {
 	SND_SOC_DAPM_OUTPUT("DAC1OUT"),
 	SND_SOC_DAPM_OUTPUT("DAC2OUT"),
 	SND_SOC_DAPM_OUTPUT("DAC3OUT"),
 	SND_SOC_DAPM_OUTPUT("DAC4OUT"),
 };

 static const struct snd_soc_dapm_route ad183x_dac_routes[] = {
 	{ "DAC1OUT", NULL, "DAC" },
 	{ "DAC2OUT", NULL, "DAC" },
 	{ "DAC3OUT", NULL, "DAC" },
 	{ "DAC4OUT", NULL, "DAC" },
 };

 static const struct snd_kcontrol_new ad183x_adc_controls[] = {
 	AD1836_ADC_SWITCH(1),
 	AD1836_ADC_SWITCH(2),
 	AD1836_ADC_SWITCH(3),
 };

 static const struct snd_soc_dapm_widget ad183x_adc_dapm_widgets[] = {
 	SND_SOC_DAPM_INPUT("ADC1IN"),
 	SND_SOC_DAPM_INPUT("ADC2IN"),
 };

 static const struct snd_soc_dapm_route ad183x_adc_routes[] = {
 	{ "ADC", NULL, "ADC1IN" },
 	{ "ADC", NULL, "ADC2IN" },
 };

 static const struct snd_kcontrol_new ad183x_controls[] = {
 	/* 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 ad183x_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),
 };

 static const struct snd_soc_dapm_route ad183x_dapm_routes[] = {
 	{ "DAC", NULL, "ADC_PWR" },
 	{ "ADC", NULL, "ADC_PWR" },
 };

 static const DECLARE_TLV_DB_SCALE(ad1836_in_tlv, 0, 300, 0);

 static const struct snd_kcontrol_new ad1836_controls[] = {
 	SOC_DOUBLE_TLV("ADC2 Capture Volume", AD1836_ADC_CTRL1, 3, 0, 4, 0,
 	    ad1836_in_tlv),
 };

 /*
  * 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_codec *codec = rtd->codec;

 	/* bit size */
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		word_len = AD1836_WORD_LEN_16;
 		break;
 	case SNDRV_PCM_FORMAT_S20_3LE:
 		word_len = AD1836_WORD_LEN_20;
 		break;
 	case SNDRV_PCM_FORMAT_S24_LE:
 	case SNDRV_PCM_FORMAT_S32_LE:
 		word_len = AD1836_WORD_LEN_24;
 		break;
 	}

 	snd_soc_update_bits(codec, AD1836_DAC_CTRL1, AD1836_DAC_WORD_LEN_MASK,
 		word_len << AD1836_DAC_WORD_LEN_OFFSET);

 	snd_soc_update_bits(codec, AD1836_ADC_CTRL2, AD1836_ADC_WORD_LEN_MASK,
 		word_len << AD1836_ADC_WORD_OFFSET);

 	return 0;
 }

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

 #define AD183X_DAI(_name, num_dacs, num_adcs) \
 { \
 	.name = _name "-hifi", \
 	.playback = { \
 		.stream_name = "Playback", \
 		.channels_min = 2, \
 		.channels_max = (num_dacs) * 2, \
 		.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 = (num_adcs) * 2, \
 		.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, \
 }

 static struct snd_soc_dai_driver ad183x_dais[] = {
 	[AD1835] = AD183X_DAI("ad1835", 4, 1),
 	[AD1836] = AD183X_DAI("ad1836", 3, 2),
 	[AD1838] = AD183X_DAI("ad1838", 3, 1),
 };

 #ifdef CONFIG_PM
 static int ad1836_suspend(struct snd_soc_codec *codec)
 {
 	/* reset clock control mode */
 	return snd_soc_update_bits(codec, AD1836_ADC_CTRL2,
 		AD1836_ADC_SERFMT_MASK, 0);
 }

 static int ad1836_resume(struct snd_soc_codec *codec)
 {
 	/* restore clock control mode */
 	return snd_soc_update_bits(codec, AD1836_ADC_CTRL2,
 		AD1836_ADC_SERFMT_MASK, AD1836_ADC_AUX);
 }
 #else
 #define ad1836_suspend NULL
 #define ad1836_resume  NULL
 #endif

 static int ad1836_probe(struct snd_soc_codec *codec)
 {
 	struct ad1836_priv *ad1836 = snd_soc_codec_get_drvdata(codec);
 	struct snd_soc_dapm_context *dapm = &codec->dapm;
 	int num_dacs, num_adcs;
 	int ret = 0;
 	int i;

 	num_dacs = ad183x_dais[ad1836->type].playback.channels_max / 2;
 	num_adcs = ad183x_dais[ad1836->type].capture.channels_max / 2;

 	ret = snd_soc_codec_set_cache_io(codec, 4, 12, SND_SOC_SPI);
 	if (ret < 0) {
 		dev_err(codec->dev, "failed to set cache I/O: %d\n",
 				ret);
 		return ret;
 	}

 	/* default setting for ad1836 */
 	/* de-emphasis: 48kHz, power-on dac */
 	snd_soc_write(codec, AD1836_DAC_CTRL1, 0x300);
 	/* unmute dac channels */
 	snd_soc_write(codec, AD1836_DAC_CTRL2, 0x0);
 	/* high-pass filter enable, power-on adc */
 	snd_soc_write(codec, AD1836_ADC_CTRL1, 0x100);
 	/* unmute adc channles, adc aux mode */
 	snd_soc_write(codec, AD1836_ADC_CTRL2, 0x180);
 	/* volume */
 	for (i = 1; i <= num_dacs; ++i) {
 		snd_soc_write(codec, AD1836_DAC_L_VOL(i), 0x3FF);
 		snd_soc_write(codec, AD1836_DAC_R_VOL(i), 0x3FF);
 	}

 	if (ad1836->type == AD1836) {
 		/* left/right diff:PGA/MUX */
 		snd_soc_write(codec, AD1836_ADC_CTRL3, 0x3A);
 		ret = snd_soc_add_codec_controls(codec, ad1836_controls,
 				ARRAY_SIZE(ad1836_controls));
 		if (ret)
 			return ret;
 	} else {
 		snd_soc_write(codec, AD1836_ADC_CTRL3, 0x00);
 	}

 	ret = snd_soc_add_codec_controls(codec, ad183x_dac_controls, num_dacs * 2);
 	if (ret)
 		return ret;

 	ret = snd_soc_add_codec_controls(codec, ad183x_adc_controls, num_adcs);
 	if (ret)
 		return ret;

 	ret = snd_soc_dapm_new_controls(dapm, ad183x_dac_dapm_widgets, num_dacs);
 	if (ret)
 		return ret;

 	ret = snd_soc_dapm_new_controls(dapm, ad183x_adc_dapm_widgets, num_adcs);
 	if (ret)
 		return ret;

 	ret = snd_soc_dapm_add_routes(dapm, ad183x_dac_routes, num_dacs);
 	if (ret)
 		return ret;

 	ret = snd_soc_dapm_add_routes(dapm, ad183x_adc_routes, num_adcs);
 	if (ret)
 		return ret;

 	return ret;
 }

 /* power down chip */
 static int ad1836_remove(struct snd_soc_codec *codec)
 {
 	/* reset clock control mode */
 	return snd_soc_update_bits(codec, AD1836_ADC_CTRL2,
 		AD1836_ADC_SERFMT_MASK, 0);
 }

 static struct snd_soc_codec_driver soc_codec_dev_ad1836 = {
 	.probe = ad1836_probe,
 	.remove = ad1836_remove,
 	.suspend = ad1836_suspend,
 	.resume = ad1836_resume,
 	.reg_cache_size = AD1836_NUM_REGS,
 	.reg_word_size = sizeof(u16),

 	.controls = ad183x_controls,
 	.num_controls = ARRAY_SIZE(ad183x_controls),
 	.dapm_widgets = ad183x_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(ad183x_dapm_widgets),
 	.dapm_routes = ad183x_dapm_routes,
 	.num_dapm_routes = ARRAY_SIZE(ad183x_dapm_routes),
 };

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

 	ad1836 = devm_kzalloc(&spi->dev, sizeof(struct ad1836_priv),
 			      GFP_KERNEL);
 	if (ad1836 == NULL)
 		return -ENOMEM;

 	ad1836->type = spi_get_device_id(spi)->driver_data;

 	spi_set_drvdata(spi, ad1836);

 	ret = snd_soc_register_codec(&spi->dev,
 			&soc_codec_dev_ad1836, &ad183x_dais[ad1836->type], 1);
 	return ret;
 }

 static int __devexit ad1836_spi_remove(struct spi_device *spi)
 {
 	snd_soc_unregister_codec(&spi->dev);
 	return 0;
 }

 static const struct spi_device_id ad1836_ids[] = {
 	{ "ad1835", AD1835 },
 	{ "ad1836", AD1836 },
 	{ "ad1837", AD1835 },
 	{ "ad1838", AD1838 },
 	{ "ad1839", AD1838 },
 	{ },
 };
 MODULE_DEVICE_TABLE(spi, ad1836_ids);

 static struct spi_driver ad1836_spi_driver = {
 	.driver = {
 		.name	= "ad1836",
 		.owner	= THIS_MODULE,
 	},
 	.probe		= ad1836_spi_probe,
 	.remove		= __devexit_p(ad1836_spi_remove),
 	.id_table	= ad1836_ids,
 };

 static int __init ad1836_init(void)
 {
 	return spi_register_driver(&ad1836_spi_driver);
 }
 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");
	/*
	* Audio Codec driver supporting:
	* AD1835A, AD1836, AD1837A, AD1838A, AD1839A
	*
	* Copyright 2009-2011 Analog Devices Inc.
	*
	* Licensed under the GPL-2 or later.
	*/

	#include <linux/init.h>
	#include <linux/slab.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 <linux/spi/spi.h>
	#include "ad1836.h"

	enum ad1836_type {
	AD1835,
	AD1836,
	AD1838,
	};

	/* codec private data */
	struct ad1836_priv {
	enum ad1836_type type;
	};

	/*
	* 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);

	#define AD1836_DAC_VOLUME(x) \
	SOC_DOUBLE_R("DAC" #x " Playback Volume", AD1836_DAC_L_VOL(x), \
	AD1836_DAC_R_VOL(x), 0, 0x3FF, 0)

	#define AD1836_DAC_SWITCH(x) \
	SOC_DOUBLE("DAC" #x " Playback Switch", AD1836_DAC_CTRL2, \
	AD1836_MUTE_LEFT(x), AD1836_MUTE_RIGHT(x), 1, 1)

	#define AD1836_ADC_SWITCH(x) \
	SOC_DOUBLE("ADC" #x " Capture Switch", AD1836_ADC_CTRL2, \
	AD1836_MUTE_LEFT(x), AD1836_MUTE_RIGHT(x), 1, 1)

	static const struct snd_kcontrol_new ad183x_dac_controls[] = {
	AD1836_DAC_VOLUME(1),
	AD1836_DAC_SWITCH(1),
	AD1836_DAC_VOLUME(2),
	AD1836_DAC_SWITCH(2),
	AD1836_DAC_VOLUME(3),
	AD1836_DAC_SWITCH(3),
	AD1836_DAC_VOLUME(4),
	AD1836_DAC_SWITCH(4),
	};

	static const struct snd_soc_dapm_widget ad183x_dac_dapm_widgets[] = {
	SND_SOC_DAPM_OUTPUT("DAC1OUT"),
	SND_SOC_DAPM_OUTPUT("DAC2OUT"),
	SND_SOC_DAPM_OUTPUT("DAC3OUT"),
	SND_SOC_DAPM_OUTPUT("DAC4OUT"),
	};

	static const struct snd_soc_dapm_route ad183x_dac_routes[] = {
	{ "DAC1OUT", NULL, "DAC" },
	{ "DAC2OUT", NULL, "DAC" },
	{ "DAC3OUT", NULL, "DAC" },
	{ "DAC4OUT", NULL, "DAC" },
	};

	static const struct snd_kcontrol_new ad183x_adc_controls[] = {
	AD1836_ADC_SWITCH(1),
	AD1836_ADC_SWITCH(2),
	AD1836_ADC_SWITCH(3),
	};

	static const struct snd_soc_dapm_widget ad183x_adc_dapm_widgets[] = {
	SND_SOC_DAPM_INPUT("ADC1IN"),
	SND_SOC_DAPM_INPUT("ADC2IN"),
	};

	static const struct snd_soc_dapm_route ad183x_adc_routes[] = {
	{ "ADC", NULL, "ADC1IN" },
	{ "ADC", NULL, "ADC2IN" },
	};

	static const struct snd_kcontrol_new ad183x_controls[] = {
	/* 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 ad183x_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),
	};

	static const struct snd_soc_dapm_route ad183x_dapm_routes[] = {
	{ "DAC", NULL, "ADC_PWR" },
	{ "ADC", NULL, "ADC_PWR" },
	};

	static const DECLARE_TLV_DB_SCALE(ad1836_in_tlv, 0, 300, 0);

	static const struct snd_kcontrol_new ad1836_controls[] = {
	SOC_DOUBLE_TLV("ADC2 Capture Volume", AD1836_ADC_CTRL1, 3, 0, 4, 0,
	ad1836_in_tlv),
	};

	/*
	* 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_codec *codec = rtd->codec;

	/* bit size */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	word_len = AD1836_WORD_LEN_16;
	break;
	case SNDRV_PCM_FORMAT_S20_3LE:
	word_len = AD1836_WORD_LEN_20;
	break;
	case SNDRV_PCM_FORMAT_S24_LE:
	case SNDRV_PCM_FORMAT_S32_LE:
	word_len = AD1836_WORD_LEN_24;
	break;
	}

	snd_soc_update_bits(codec, AD1836_DAC_CTRL1, AD1836_DAC_WORD_LEN_MASK,
	word_len << AD1836_DAC_WORD_LEN_OFFSET);

	snd_soc_update_bits(codec, AD1836_ADC_CTRL2, AD1836_ADC_WORD_LEN_MASK,
	word_len << AD1836_ADC_WORD_OFFSET);

	return 0;
	}

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

	#define AD183X_DAI(_name, num_dacs, num_adcs) \
	{ \
	.name = _name "-hifi", \
	.playback = { \
	.stream_name = "Playback", \
	.channels_min = 2, \
	.channels_max = (num_dacs) * 2, \
	.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 = (num_adcs) * 2, \
	.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, \
	}

	static struct snd_soc_dai_driver ad183x_dais[] = {
	[AD1835] = AD183X_DAI("ad1835", 4, 1),
	[AD1836] = AD183X_DAI("ad1836", 3, 2),
	[AD1838] = AD183X_DAI("ad1838", 3, 1),
	};

	#ifdef CONFIG_PM
	static int ad1836_suspend(struct snd_soc_codec *codec)
	{
	/* reset clock control mode */
	return snd_soc_update_bits(codec, AD1836_ADC_CTRL2,
	AD1836_ADC_SERFMT_MASK, 0);
	}

	static int ad1836_resume(struct snd_soc_codec *codec)
	{
	/* restore clock control mode */
	return snd_soc_update_bits(codec, AD1836_ADC_CTRL2,
	AD1836_ADC_SERFMT_MASK, AD1836_ADC_AUX);
	}
	#else
	#define ad1836_suspend NULL
	#define ad1836_resume NULL
	#endif

	static int ad1836_probe(struct snd_soc_codec *codec)
	{
	struct ad1836_priv *ad1836 = snd_soc_codec_get_drvdata(codec);
	struct snd_soc_dapm_context *dapm = &codec->dapm;
	int num_dacs, num_adcs;
	int ret = 0;
	int i;

	num_dacs = ad183x_dais[ad1836->type].playback.channels_max / 2;
	num_adcs = ad183x_dais[ad1836->type].capture.channels_max / 2;

	ret = snd_soc_codec_set_cache_io(codec, 4, 12, SND_SOC_SPI);
	if (ret < 0) {
	dev_err(codec->dev, "failed to set cache I/O: %d\n",
	ret);
	return ret;
	}

	/* default setting for ad1836 */
	/* de-emphasis: 48kHz, power-on dac */
	snd_soc_write(codec, AD1836_DAC_CTRL1, 0x300);
	/* unmute dac channels */
	snd_soc_write(codec, AD1836_DAC_CTRL2, 0x0);
	/* high-pass filter enable, power-on adc */
	snd_soc_write(codec, AD1836_ADC_CTRL1, 0x100);
	/* unmute adc channles, adc aux mode */
	snd_soc_write(codec, AD1836_ADC_CTRL2, 0x180);
	/* volume */
	for (i = 1; i <= num_dacs; ++i) {
	snd_soc_write(codec, AD1836_DAC_L_VOL(i), 0x3FF);
	snd_soc_write(codec, AD1836_DAC_R_VOL(i), 0x3FF);
	}

	if (ad1836->type == AD1836) {
	/* left/right diff:PGA/MUX */
	snd_soc_write(codec, AD1836_ADC_CTRL3, 0x3A);
	ret = snd_soc_add_codec_controls(codec, ad1836_controls,
	ARRAY_SIZE(ad1836_controls));
	if (ret)
	return ret;
	} else {
	snd_soc_write(codec, AD1836_ADC_CTRL3, 0x00);
	}

	ret = snd_soc_add_codec_controls(codec, ad183x_dac_controls, num_dacs * 2);
	if (ret)
	return ret;

	ret = snd_soc_add_codec_controls(codec, ad183x_adc_controls, num_adcs);
	if (ret)
	return ret;

	ret = snd_soc_dapm_new_controls(dapm, ad183x_dac_dapm_widgets, num_dacs);
	if (ret)
	return ret;

	ret = snd_soc_dapm_new_controls(dapm, ad183x_adc_dapm_widgets, num_adcs);
	if (ret)
	return ret;

	ret = snd_soc_dapm_add_routes(dapm, ad183x_dac_routes, num_dacs);
	if (ret)
	return ret;

	ret = snd_soc_dapm_add_routes(dapm, ad183x_adc_routes, num_adcs);
	if (ret)
	return ret;

	return ret;
	}

	/* power down chip */
	static int ad1836_remove(struct snd_soc_codec *codec)
	{
	/* reset clock control mode */
	return snd_soc_update_bits(codec, AD1836_ADC_CTRL2,
	AD1836_ADC_SERFMT_MASK, 0);
	}

	static struct snd_soc_codec_driver soc_codec_dev_ad1836 = {
	.probe = ad1836_probe,
	.remove = ad1836_remove,
	.suspend = ad1836_suspend,
	.resume = ad1836_resume,
	.reg_cache_size = AD1836_NUM_REGS,
	.reg_word_size = sizeof(u16),

	.controls = ad183x_controls,
	.num_controls = ARRAY_SIZE(ad183x_controls),
	.dapm_widgets = ad183x_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(ad183x_dapm_widgets),
	.dapm_routes = ad183x_dapm_routes,
	.num_dapm_routes = ARRAY_SIZE(ad183x_dapm_routes),
	};

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

	ad1836 = devm_kzalloc(&spi->dev, sizeof(struct ad1836_priv),
	GFP_KERNEL);
	if (ad1836 == NULL)
	return -ENOMEM;

	ad1836->type = spi_get_device_id(spi)->driver_data;

	spi_set_drvdata(spi, ad1836);

	ret = snd_soc_register_codec(&spi->dev,
	&soc_codec_dev_ad1836, &ad183x_dais[ad1836->type], 1);
	return ret;
	}

	static int __devexit ad1836_spi_remove(struct spi_device *spi)
	{
	snd_soc_unregister_codec(&spi->dev);
	return 0;
	}

	static const struct spi_device_id ad1836_ids[] = {
	{ "ad1835", AD1835 },
	{ "ad1836", AD1836 },
	{ "ad1837", AD1835 },
	{ "ad1838", AD1838 },
	{ "ad1839", AD1838 },
	{ },
	};
	MODULE_DEVICE_TABLE(spi, ad1836_ids);

	static struct spi_driver ad1836_spi_driver = {
	.driver = {
	.name = "ad1836",
	.owner = THIS_MODULE,
	},
	.probe = ad1836_spi_probe,
	.remove = __devexit_p(ad1836_spi_remove),
	.id_table = ad1836_ids,
	};

	static int __init ad1836_init(void)
	{
	return spi_register_driver(&ad1836_spi_driver);
	}
	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");