sound/soc/codecs/ssm4567.c - linux - Git at Google

 /*
  * SSM4567 amplifier audio driver
  *
  * Copyright 2014 Google Chromium project.
  *  Author: Anatol Pomozov <anatol@chromium.org>
  *
  * Based on code copyright/by:
  *   Copyright 2013 Analog Devices Inc.
  *
  * Licensed under the GPL-2.
  */

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/i2c.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/initval.h>
 #include <sound/tlv.h>

 #define SSM4567_REG_POWER_CTRL		0x00
 #define SSM4567_REG_AMP_SNS_CTRL		0x01
 #define SSM4567_REG_DAC_CTRL		0x02
 #define SSM4567_REG_DAC_VOLUME		0x03
 #define SSM4567_REG_SAI_CTRL_1		0x04
 #define SSM4567_REG_SAI_CTRL_2		0x05
 #define SSM4567_REG_SAI_PLACEMENT_1		0x06
 #define SSM4567_REG_SAI_PLACEMENT_2		0x07
 #define SSM4567_REG_SAI_PLACEMENT_3		0x08
 #define SSM4567_REG_SAI_PLACEMENT_4		0x09
 #define SSM4567_REG_SAI_PLACEMENT_5		0x0a
 #define SSM4567_REG_SAI_PLACEMENT_6		0x0b
 #define SSM4567_REG_BATTERY_V_OUT		0x0c
 #define SSM4567_REG_LIMITER_CTRL_1		0x0d
 #define SSM4567_REG_LIMITER_CTRL_2		0x0e
 #define SSM4567_REG_LIMITER_CTRL_3		0x0f
 #define SSM4567_REG_STATUS_1		0x10
 #define SSM4567_REG_STATUS_2		0x11
 #define SSM4567_REG_FAULT_CTRL		0x12
 #define SSM4567_REG_PDM_CTRL		0x13
 #define SSM4567_REG_MCLK_RATIO		0x14
 #define SSM4567_REG_BOOST_CTRL_1		0x15
 #define SSM4567_REG_BOOST_CTRL_2		0x16
 #define SSM4567_REG_SOFT_RESET		0xff

 /* POWER_CTRL */
 #define SSM4567_POWER_APWDN_EN		BIT(7)
 #define SSM4567_POWER_BSNS_PWDN		BIT(6)
 #define SSM4567_POWER_VSNS_PWDN		BIT(5)
 #define SSM4567_POWER_ISNS_PWDN		BIT(4)
 #define SSM4567_POWER_BOOST_PWDN		BIT(3)
 #define SSM4567_POWER_AMP_PWDN		BIT(2)
 #define SSM4567_POWER_VBAT_ONLY		BIT(1)
 #define SSM4567_POWER_SPWDN			BIT(0)

 /* DAC_CTRL */
 #define SSM4567_DAC_HV			BIT(7)
 #define SSM4567_DAC_MUTE		BIT(6)
 #define SSM4567_DAC_HPF			BIT(5)
 #define SSM4567_DAC_LPM			BIT(4)
 #define SSM4567_DAC_FS_MASK	0x7
 #define SSM4567_DAC_FS_8000_12000	0x0
 #define SSM4567_DAC_FS_16000_24000	0x1
 #define SSM4567_DAC_FS_32000_48000	0x2
 #define SSM4567_DAC_FS_64000_96000	0x3
 #define SSM4567_DAC_FS_128000_192000	0x4

 struct ssm4567 {
 	struct regmap *regmap;
 };

 static const struct reg_default ssm4567_reg_defaults[] = {
 	{ SSM4567_REG_POWER_CTRL,	0x81 },
 	{ SSM4567_REG_AMP_SNS_CTRL, 0x09 },
 	{ SSM4567_REG_DAC_CTRL, 0x32 },
 	{ SSM4567_REG_DAC_VOLUME, 0x40 },
 	{ SSM4567_REG_SAI_CTRL_1, 0x00 },
 	{ SSM4567_REG_SAI_CTRL_2, 0x08 },
 	{ SSM4567_REG_SAI_PLACEMENT_1, 0x01 },
 	{ SSM4567_REG_SAI_PLACEMENT_2, 0x20 },
 	{ SSM4567_REG_SAI_PLACEMENT_3, 0x32 },
 	{ SSM4567_REG_SAI_PLACEMENT_4, 0x07 },
 	{ SSM4567_REG_SAI_PLACEMENT_5, 0x07 },
 	{ SSM4567_REG_SAI_PLACEMENT_6, 0x07 },
 	{ SSM4567_REG_BATTERY_V_OUT, 0x00 },
 	{ SSM4567_REG_LIMITER_CTRL_1, 0xa4 },
 	{ SSM4567_REG_LIMITER_CTRL_2, 0x73 },
 	{ SSM4567_REG_LIMITER_CTRL_3, 0x00 },
 	{ SSM4567_REG_STATUS_1, 0x00 },
 	{ SSM4567_REG_STATUS_2, 0x00 },
 	{ SSM4567_REG_FAULT_CTRL, 0x30 },
 	{ SSM4567_REG_PDM_CTRL, 0x40 },
 	{ SSM4567_REG_MCLK_RATIO, 0x11 },
 	{ SSM4567_REG_BOOST_CTRL_1, 0x03 },
 	{ SSM4567_REG_BOOST_CTRL_2, 0x00 },
 	{ SSM4567_REG_SOFT_RESET, 0x00 },
 };


 static bool ssm4567_readable_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case SSM4567_REG_POWER_CTRL ... SSM4567_REG_BOOST_CTRL_2:
 		return true;
 	default:
 		return false;
 	}

 }

 static bool ssm4567_writeable_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case SSM4567_REG_POWER_CTRL ... SSM4567_REG_SAI_PLACEMENT_6:
 	case SSM4567_REG_LIMITER_CTRL_1 ... SSM4567_REG_LIMITER_CTRL_3:
 	case SSM4567_REG_FAULT_CTRL ... SSM4567_REG_BOOST_CTRL_2:
 	/* The datasheet states that soft reset register is read-only,
 	 * but logically it is write-only. */
 	case SSM4567_REG_SOFT_RESET:
 		return true;
 	default:
 		return false;
 	}
 }

 static bool ssm4567_volatile_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case SSM4567_REG_BATTERY_V_OUT:
 	case SSM4567_REG_STATUS_1 ... SSM4567_REG_STATUS_2:
 	case SSM4567_REG_SOFT_RESET:
 		return true;
 	default:
 		return false;
 	}
 }

 static const DECLARE_TLV_DB_MINMAX_MUTE(ssm4567_vol_tlv, -7125, 2400);

 static const struct snd_kcontrol_new ssm4567_snd_controls[] = {
 	SOC_SINGLE_TLV("Master Playback Volume", SSM4567_REG_DAC_VOLUME, 0,
 		0xff, 1, ssm4567_vol_tlv),
 	SOC_SINGLE("DAC Low Power Mode Switch", SSM4567_REG_DAC_CTRL, 4, 1, 0),
 };

 static const struct snd_soc_dapm_widget ssm4567_dapm_widgets[] = {
 	SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SSM4567_REG_POWER_CTRL, 2, 1),

 	SND_SOC_DAPM_OUTPUT("OUT"),
 };

 static const struct snd_soc_dapm_route ssm4567_routes[] = {
 	{ "OUT", NULL, "DAC" },
 };

 static int ssm4567_hw_params(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	struct ssm4567 *ssm4567 = snd_soc_codec_get_drvdata(codec);
 	unsigned int rate = params_rate(params);
 	unsigned int dacfs;

 	if (rate >= 8000 && rate <= 12000)
 		dacfs = SSM4567_DAC_FS_8000_12000;
 	else if (rate >= 16000 && rate <= 24000)
 		dacfs = SSM4567_DAC_FS_16000_24000;
 	else if (rate >= 32000 && rate <= 48000)
 		dacfs = SSM4567_DAC_FS_32000_48000;
 	else if (rate >= 64000 && rate <= 96000)
 		dacfs = SSM4567_DAC_FS_64000_96000;
 	else if (rate >= 128000 && rate <= 192000)
 		dacfs = SSM4567_DAC_FS_128000_192000;
 	else
 		return -EINVAL;

 	return regmap_update_bits(ssm4567->regmap, SSM4567_REG_DAC_CTRL,
 				SSM4567_DAC_FS_MASK, dacfs);
 }

 static int ssm4567_mute(struct snd_soc_dai *dai, int mute)
 {
 	struct ssm4567 *ssm4567 = snd_soc_codec_get_drvdata(dai->codec);
 	unsigned int val;

 	val = mute ? SSM4567_DAC_MUTE : 0;
 	return regmap_update_bits(ssm4567->regmap, SSM4567_REG_DAC_CTRL,
 			SSM4567_DAC_MUTE, val);
 }

 static int ssm4567_set_power(struct ssm4567 *ssm4567, bool enable)
 {
 	int ret = 0;

 	if (!enable) {
 		ret = regmap_update_bits(ssm4567->regmap,
 			SSM4567_REG_POWER_CTRL,
 			SSM4567_POWER_SPWDN, SSM4567_POWER_SPWDN);
 		regcache_mark_dirty(ssm4567->regmap);
 	}

 	regcache_cache_only(ssm4567->regmap, !enable);

 	if (enable) {
 		ret = regmap_update_bits(ssm4567->regmap,
 			SSM4567_REG_POWER_CTRL,
 			SSM4567_POWER_SPWDN, 0x00);
 		regcache_sync(ssm4567->regmap);
 	}

 	return ret;
 }

 static int ssm4567_set_bias_level(struct snd_soc_codec *codec,
 	enum snd_soc_bias_level level)
 {
 	struct ssm4567 *ssm4567 = snd_soc_codec_get_drvdata(codec);
 	int ret = 0;

 	switch (level) {
 	case SND_SOC_BIAS_ON:
 		break;
 	case SND_SOC_BIAS_PREPARE:
 		break;
 	case SND_SOC_BIAS_STANDBY:
 		if (codec->dapm.bias_level == SND_SOC_BIAS_OFF)
 			ret = ssm4567_set_power(ssm4567, true);
 		break;
 	case SND_SOC_BIAS_OFF:
 		ret = ssm4567_set_power(ssm4567, false);
 		break;
 	}

 	if (ret)
 		return ret;

 	codec->dapm.bias_level = level;

 	return 0;
 }

 static const struct snd_soc_dai_ops ssm4567_dai_ops = {
 	.hw_params	= ssm4567_hw_params,
 	.digital_mute	= ssm4567_mute,
 };

 static struct snd_soc_dai_driver ssm4567_dai = {
 	.name = "ssm4567-hifi",
 	.playback = {
 		.stream_name = "Playback",
 		.channels_min = 1,
 		.channels_max = 1,
 		.rates = SNDRV_PCM_RATE_8000_192000,
 		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE |
 			SNDRV_PCM_FMTBIT_S32,
 	},
 	.ops = &ssm4567_dai_ops,
 };

 static struct snd_soc_codec_driver ssm4567_codec_driver = {
 	.set_bias_level = ssm4567_set_bias_level,
 	.idle_bias_off = true,

 	.controls = ssm4567_snd_controls,
 	.num_controls = ARRAY_SIZE(ssm4567_snd_controls),
 	.dapm_widgets = ssm4567_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(ssm4567_dapm_widgets),
 	.dapm_routes = ssm4567_routes,
 	.num_dapm_routes = ARRAY_SIZE(ssm4567_routes),
 };

 static const struct regmap_config ssm4567_regmap_config = {
 	.val_bits = 8,
 	.reg_bits = 8,

 	.max_register = SSM4567_REG_SOFT_RESET,
 	.readable_reg = ssm4567_readable_reg,
 	.writeable_reg = ssm4567_writeable_reg,
 	.volatile_reg = ssm4567_volatile_reg,

 	.cache_type = REGCACHE_RBTREE,
 	.reg_defaults = ssm4567_reg_defaults,
 	.num_reg_defaults = ARRAY_SIZE(ssm4567_reg_defaults),
 };

 static int ssm4567_i2c_probe(struct i2c_client *i2c,
 	const struct i2c_device_id *id)
 {
 	struct ssm4567 *ssm4567;
 	int ret;

 	ssm4567 = devm_kzalloc(&i2c->dev, sizeof(*ssm4567), GFP_KERNEL);
 	if (ssm4567 == NULL)
 		return -ENOMEM;

 	i2c_set_clientdata(i2c, ssm4567);

 	ssm4567->regmap = devm_regmap_init_i2c(i2c, &ssm4567_regmap_config);
 	if (IS_ERR(ssm4567->regmap))
 		return PTR_ERR(ssm4567->regmap);

 	ret = regmap_write(ssm4567->regmap, SSM4567_REG_SOFT_RESET, 0x00);
 	if (ret)
 		return ret;

 	ret = ssm4567_set_power(ssm4567, false);
 	if (ret)
 		return ret;

 	return snd_soc_register_codec(&i2c->dev, &ssm4567_codec_driver,
 			&ssm4567_dai, 1);
 }

 static int ssm4567_i2c_remove(struct i2c_client *client)
 {
 	snd_soc_unregister_codec(&client->dev);
 	return 0;
 }

 static const struct i2c_device_id ssm4567_i2c_ids[] = {
 	{ "ssm4567", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, ssm4567_i2c_ids);

 static struct i2c_driver ssm4567_driver = {
 	.driver = {
 		.name = "ssm4567",
 		.owner = THIS_MODULE,
 	},
 	.probe = ssm4567_i2c_probe,
 	.remove = ssm4567_i2c_remove,
 	.id_table = ssm4567_i2c_ids,
 };
 module_i2c_driver(ssm4567_driver);

 MODULE_DESCRIPTION("ASoC SSM4567 driver");
 MODULE_AUTHOR("Anatol Pomozov <anatol@chromium.org>");
 MODULE_LICENSE("GPL");
	/*
	* SSM4567 amplifier audio driver
	*
	* Copyright 2014 Google Chromium project.
	* Author: Anatol Pomozov <anatol@chromium.org>
	*
	* Based on code copyright/by:
	* Copyright 2013 Analog Devices Inc.
	*
	* Licensed under the GPL-2.
	*/

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/i2c.h>
	#include <linux/regmap.h>
	#include <linux/slab.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/initval.h>
	#include <sound/tlv.h>

	#define SSM4567_REG_POWER_CTRL 0x00
	#define SSM4567_REG_AMP_SNS_CTRL 0x01
	#define SSM4567_REG_DAC_CTRL 0x02
	#define SSM4567_REG_DAC_VOLUME 0x03
	#define SSM4567_REG_SAI_CTRL_1 0x04
	#define SSM4567_REG_SAI_CTRL_2 0x05
	#define SSM4567_REG_SAI_PLACEMENT_1 0x06
	#define SSM4567_REG_SAI_PLACEMENT_2 0x07
	#define SSM4567_REG_SAI_PLACEMENT_3 0x08
	#define SSM4567_REG_SAI_PLACEMENT_4 0x09
	#define SSM4567_REG_SAI_PLACEMENT_5 0x0a
	#define SSM4567_REG_SAI_PLACEMENT_6 0x0b
	#define SSM4567_REG_BATTERY_V_OUT 0x0c
	#define SSM4567_REG_LIMITER_CTRL_1 0x0d
	#define SSM4567_REG_LIMITER_CTRL_2 0x0e
	#define SSM4567_REG_LIMITER_CTRL_3 0x0f
	#define SSM4567_REG_STATUS_1 0x10
	#define SSM4567_REG_STATUS_2 0x11
	#define SSM4567_REG_FAULT_CTRL 0x12
	#define SSM4567_REG_PDM_CTRL 0x13
	#define SSM4567_REG_MCLK_RATIO 0x14
	#define SSM4567_REG_BOOST_CTRL_1 0x15
	#define SSM4567_REG_BOOST_CTRL_2 0x16
	#define SSM4567_REG_SOFT_RESET 0xff

	/* POWER_CTRL */
	#define SSM4567_POWER_APWDN_EN BIT(7)
	#define SSM4567_POWER_BSNS_PWDN BIT(6)
	#define SSM4567_POWER_VSNS_PWDN BIT(5)
	#define SSM4567_POWER_ISNS_PWDN BIT(4)
	#define SSM4567_POWER_BOOST_PWDN BIT(3)
	#define SSM4567_POWER_AMP_PWDN BIT(2)
	#define SSM4567_POWER_VBAT_ONLY BIT(1)
	#define SSM4567_POWER_SPWDN BIT(0)

	/* DAC_CTRL */
	#define SSM4567_DAC_HV BIT(7)
	#define SSM4567_DAC_MUTE BIT(6)
	#define SSM4567_DAC_HPF BIT(5)
	#define SSM4567_DAC_LPM BIT(4)
	#define SSM4567_DAC_FS_MASK 0x7
	#define SSM4567_DAC_FS_8000_12000 0x0
	#define SSM4567_DAC_FS_16000_24000 0x1
	#define SSM4567_DAC_FS_32000_48000 0x2
	#define SSM4567_DAC_FS_64000_96000 0x3
	#define SSM4567_DAC_FS_128000_192000 0x4

	struct ssm4567 {
	struct regmap *regmap;
	};

	static const struct reg_default ssm4567_reg_defaults[] = {
	{ SSM4567_REG_POWER_CTRL, 0x81 },
	{ SSM4567_REG_AMP_SNS_CTRL, 0x09 },
	{ SSM4567_REG_DAC_CTRL, 0x32 },
	{ SSM4567_REG_DAC_VOLUME, 0x40 },
	{ SSM4567_REG_SAI_CTRL_1, 0x00 },
	{ SSM4567_REG_SAI_CTRL_2, 0x08 },
	{ SSM4567_REG_SAI_PLACEMENT_1, 0x01 },
	{ SSM4567_REG_SAI_PLACEMENT_2, 0x20 },
	{ SSM4567_REG_SAI_PLACEMENT_3, 0x32 },
	{ SSM4567_REG_SAI_PLACEMENT_4, 0x07 },
	{ SSM4567_REG_SAI_PLACEMENT_5, 0x07 },
	{ SSM4567_REG_SAI_PLACEMENT_6, 0x07 },
	{ SSM4567_REG_BATTERY_V_OUT, 0x00 },
	{ SSM4567_REG_LIMITER_CTRL_1, 0xa4 },
	{ SSM4567_REG_LIMITER_CTRL_2, 0x73 },
	{ SSM4567_REG_LIMITER_CTRL_3, 0x00 },
	{ SSM4567_REG_STATUS_1, 0x00 },
	{ SSM4567_REG_STATUS_2, 0x00 },
	{ SSM4567_REG_FAULT_CTRL, 0x30 },
	{ SSM4567_REG_PDM_CTRL, 0x40 },
	{ SSM4567_REG_MCLK_RATIO, 0x11 },
	{ SSM4567_REG_BOOST_CTRL_1, 0x03 },
	{ SSM4567_REG_BOOST_CTRL_2, 0x00 },
	{ SSM4567_REG_SOFT_RESET, 0x00 },
	};


	static bool ssm4567_readable_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case SSM4567_REG_POWER_CTRL ... SSM4567_REG_BOOST_CTRL_2:
	return true;
	default:
	return false;
	}

	}

	static bool ssm4567_writeable_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case SSM4567_REG_POWER_CTRL ... SSM4567_REG_SAI_PLACEMENT_6:
	case SSM4567_REG_LIMITER_CTRL_1 ... SSM4567_REG_LIMITER_CTRL_3:
	case SSM4567_REG_FAULT_CTRL ... SSM4567_REG_BOOST_CTRL_2:
	/* The datasheet states that soft reset register is read-only,
	* but logically it is write-only. */
	case SSM4567_REG_SOFT_RESET:
	return true;
	default:
	return false;
	}
	}

	static bool ssm4567_volatile_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case SSM4567_REG_BATTERY_V_OUT:
	case SSM4567_REG_STATUS_1 ... SSM4567_REG_STATUS_2:
	case SSM4567_REG_SOFT_RESET:
	return true;
	default:
	return false;
	}
	}

	static const DECLARE_TLV_DB_MINMAX_MUTE(ssm4567_vol_tlv, -7125, 2400);

	static const struct snd_kcontrol_new ssm4567_snd_controls[] = {
	SOC_SINGLE_TLV("Master Playback Volume", SSM4567_REG_DAC_VOLUME, 0,
	0xff, 1, ssm4567_vol_tlv),
	SOC_SINGLE("DAC Low Power Mode Switch", SSM4567_REG_DAC_CTRL, 4, 1, 0),
	};

	static const struct snd_soc_dapm_widget ssm4567_dapm_widgets[] = {
	SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SSM4567_REG_POWER_CTRL, 2, 1),

	SND_SOC_DAPM_OUTPUT("OUT"),
	};

	static const struct snd_soc_dapm_route ssm4567_routes[] = {
	{ "OUT", NULL, "DAC" },
	};

	static int ssm4567_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params params, struct snd_soc_dai dai)
	{
	struct snd_soc_codec *codec = dai->codec;
	struct ssm4567 *ssm4567 = snd_soc_codec_get_drvdata(codec);
	unsigned int rate = params_rate(params);
	unsigned int dacfs;

	if (rate >= 8000 && rate <= 12000)
	dacfs = SSM4567_DAC_FS_8000_12000;
	else if (rate >= 16000 && rate <= 24000)
	dacfs = SSM4567_DAC_FS_16000_24000;
	else if (rate >= 32000 && rate <= 48000)
	dacfs = SSM4567_DAC_FS_32000_48000;
	else if (rate >= 64000 && rate <= 96000)
	dacfs = SSM4567_DAC_FS_64000_96000;
	else if (rate >= 128000 && rate <= 192000)
	dacfs = SSM4567_DAC_FS_128000_192000;
	else
	return -EINVAL;

	return regmap_update_bits(ssm4567->regmap, SSM4567_REG_DAC_CTRL,
	SSM4567_DAC_FS_MASK, dacfs);
	}

	static int ssm4567_mute(struct snd_soc_dai *dai, int mute)
	{
	struct ssm4567 *ssm4567 = snd_soc_codec_get_drvdata(dai->codec);
	unsigned int val;

	val = mute ? SSM4567_DAC_MUTE : 0;
	return regmap_update_bits(ssm4567->regmap, SSM4567_REG_DAC_CTRL,
	SSM4567_DAC_MUTE, val);
	}

	static int ssm4567_set_power(struct ssm4567 *ssm4567, bool enable)
	{
	int ret = 0;

	if (!enable) {
	ret = regmap_update_bits(ssm4567->regmap,
	SSM4567_REG_POWER_CTRL,
	SSM4567_POWER_SPWDN, SSM4567_POWER_SPWDN);
	regcache_mark_dirty(ssm4567->regmap);
	}

	regcache_cache_only(ssm4567->regmap, !enable);

	if (enable) {
	ret = regmap_update_bits(ssm4567->regmap,
	SSM4567_REG_POWER_CTRL,
	SSM4567_POWER_SPWDN, 0x00);
	regcache_sync(ssm4567->regmap);
	}

	return ret;
	}

	static int ssm4567_set_bias_level(struct snd_soc_codec *codec,
	enum snd_soc_bias_level level)
	{
	struct ssm4567 *ssm4567 = snd_soc_codec_get_drvdata(codec);
	int ret = 0;

	switch (level) {
	case SND_SOC_BIAS_ON:
	break;
	case SND_SOC_BIAS_PREPARE:
	break;
	case SND_SOC_BIAS_STANDBY:
	if (codec->dapm.bias_level == SND_SOC_BIAS_OFF)
	ret = ssm4567_set_power(ssm4567, true);
	break;
	case SND_SOC_BIAS_OFF:
	ret = ssm4567_set_power(ssm4567, false);
	break;
	}

	if (ret)
	return ret;

	codec->dapm.bias_level = level;

	return 0;
	}

	static const struct snd_soc_dai_ops ssm4567_dai_ops = {
	.hw_params = ssm4567_hw_params,
	.digital_mute = ssm4567_mute,
	};

	static struct snd_soc_dai_driver ssm4567_dai = {
	.name = "ssm4567-hifi",
	.playback = {
	.stream_name = "Playback",
	.channels_min = 1,
	.channels_max = 1,
	.rates = SNDRV_PCM_RATE_8000_192000,
	.formats = SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S24_LE \|
	SNDRV_PCM_FMTBIT_S32,
	},
	.ops = &ssm4567_dai_ops,
	};

	static struct snd_soc_codec_driver ssm4567_codec_driver = {
	.set_bias_level = ssm4567_set_bias_level,
	.idle_bias_off = true,

	.controls = ssm4567_snd_controls,
	.num_controls = ARRAY_SIZE(ssm4567_snd_controls),
	.dapm_widgets = ssm4567_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(ssm4567_dapm_widgets),
	.dapm_routes = ssm4567_routes,
	.num_dapm_routes = ARRAY_SIZE(ssm4567_routes),
	};

	static const struct regmap_config ssm4567_regmap_config = {
	.val_bits = 8,
	.reg_bits = 8,

	.max_register = SSM4567_REG_SOFT_RESET,
	.readable_reg = ssm4567_readable_reg,
	.writeable_reg = ssm4567_writeable_reg,
	.volatile_reg = ssm4567_volatile_reg,

	.cache_type = REGCACHE_RBTREE,
	.reg_defaults = ssm4567_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(ssm4567_reg_defaults),
	};

	static int ssm4567_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct ssm4567 *ssm4567;
	int ret;

	ssm4567 = devm_kzalloc(&i2c->dev, sizeof(*ssm4567), GFP_KERNEL);
	if (ssm4567 == NULL)
	return -ENOMEM;

	i2c_set_clientdata(i2c, ssm4567);

	ssm4567->regmap = devm_regmap_init_i2c(i2c, &ssm4567_regmap_config);
	if (IS_ERR(ssm4567->regmap))
	return PTR_ERR(ssm4567->regmap);

	ret = regmap_write(ssm4567->regmap, SSM4567_REG_SOFT_RESET, 0x00);
	if (ret)
	return ret;

	ret = ssm4567_set_power(ssm4567, false);
	if (ret)
	return ret;

	return snd_soc_register_codec(&i2c->dev, &ssm4567_codec_driver,
	&ssm4567_dai, 1);
	}

	static int ssm4567_i2c_remove(struct i2c_client *client)
	{
	snd_soc_unregister_codec(&client->dev);
	return 0;
	}

	static const struct i2c_device_id ssm4567_i2c_ids[] = {
	{ "ssm4567", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, ssm4567_i2c_ids);

	static struct i2c_driver ssm4567_driver = {
	.driver = {
	.name = "ssm4567",
	.owner = THIS_MODULE,
	},
	.probe = ssm4567_i2c_probe,
	.remove = ssm4567_i2c_remove,
	.id_table = ssm4567_i2c_ids,
	};
	module_i2c_driver(ssm4567_driver);

	MODULE_DESCRIPTION("ASoC SSM4567 driver");
	MODULE_AUTHOR("Anatol Pomozov <anatol@chromium.org>");
	MODULE_LICENSE("GPL");