sound/soc/codecs/cs4349.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * cs4349.c  --  CS4349 ALSA Soc Audio driver
  *
  * Copyright 2015 Cirrus Logic, Inc.
  *
  * Authors: Tim Howe <Tim.Howe@cirrus.com>
  */

 #include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/platform_device.h>
 #include <linux/pm.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/soc-dapm.h>
 #include <sound/initval.h>
 #include <sound/tlv.h>
 #include "cs4349.h"


 static const struct reg_default cs4349_reg_defaults[] = {
 	{ 2, 0x00 },	/* r02	- Mode Control */
 	{ 3, 0x09 },	/* r03	- Volume, Mixing and Inversion Control */
 	{ 4, 0x81 },	/* r04	- Mute Control */
 	{ 5, 0x00 },	/* r05	- Channel A Volume Control */
 	{ 6, 0x00 },	/* r06	- Channel B Volume Control */
 	{ 7, 0xB1 },	/* r07	- Ramp and Filter Control */
 	{ 8, 0x1C },	/* r08	- Misc. Control */
 };

 /* Private data for the CS4349 */
 struct  cs4349_private {
 	struct regmap			*regmap;
 	struct gpio_desc		*reset_gpio;
 	unsigned int			mode;
 	int				rate;
 };

 static bool cs4349_readable_register(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case CS4349_CHIPID ... CS4349_MISC:
 		return true;
 	default:
 		return false;
 	}
 }

 static bool cs4349_writeable_register(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case CS4349_MODE ...  CS4349_MISC:
 		return true;
 	default:
 		return false;
 	}
 }

 static int cs4349_set_dai_fmt(struct snd_soc_dai *codec_dai,
 			      unsigned int format)
 {
 	struct snd_soc_component *component = codec_dai->component;
 	struct cs4349_private *cs4349 = snd_soc_component_get_drvdata(component);
 	unsigned int fmt;

 	fmt = format & SND_SOC_DAIFMT_FORMAT_MASK;

 	switch (fmt) {
 	case SND_SOC_DAIFMT_I2S:
 	case SND_SOC_DAIFMT_LEFT_J:
 	case SND_SOC_DAIFMT_RIGHT_J:
 		cs4349->mode = format & SND_SOC_DAIFMT_FORMAT_MASK;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int cs4349_pcm_hw_params(struct snd_pcm_substream *substream,
 			    struct snd_pcm_hw_params *params,
 			    struct snd_soc_dai *dai)
 {
 	struct snd_soc_component *component = dai->component;
 	struct cs4349_private *cs4349 = snd_soc_component_get_drvdata(component);
 	int fmt, ret;

 	cs4349->rate = params_rate(params);

 	switch (cs4349->mode) {
 	case SND_SOC_DAIFMT_I2S:
 		fmt = DIF_I2S;
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		fmt = DIF_LEFT_JST;
 		break;
 	case SND_SOC_DAIFMT_RIGHT_J:
 		switch (params_width(params)) {
 		case 16:
 			fmt = DIF_RGHT_JST16;
 			break;
 		case 24:
 			fmt = DIF_RGHT_JST24;
 			break;
 		default:
 			return -EINVAL;
 		}
 		break;
 	default:
 		return -EINVAL;
 	}

 	ret = snd_soc_component_update_bits(component, CS4349_MODE, DIF_MASK,
 				  MODE_FORMAT(fmt));
 	if (ret < 0)
 		return ret;

 	return 0;
 }

 static int cs4349_mute(struct snd_soc_dai *dai, int mute, int direction)
 {
 	struct snd_soc_component *component = dai->component;
 	int reg;

 	reg = 0;
 	if (mute)
 		reg = MUTE_AB_MASK;

 	return snd_soc_component_update_bits(component, CS4349_MUTE, MUTE_AB_MASK, reg);
 }

 static DECLARE_TLV_DB_SCALE(dig_tlv, -12750, 50, 0);

 static const char * const chan_mix_texts[] = {
 	"Mute", "MuteA", "MuteA SwapB", "MuteA MonoB", "SwapA MuteB",
 	"BothR", "Swap", "SwapA MonoB", "MuteB", "Normal", "BothL",
 	"MonoB", "MonoA MuteB", "MonoA", "MonoA SwapB", "Mono",
 	/*Normal == Channel A = Left, Channel B = Right*/
 };

 static const char * const fm_texts[] = {
 	"Auto", "Single", "Double", "Quad",
 };

 static const char * const deemph_texts[] = {
 	"None", "44.1k", "48k", "32k",
 };

 static const char * const softr_zeroc_texts[] = {
 	"Immediate", "Zero Cross", "Soft Ramp", "SR on ZC",
 };

 static int deemph_values[] = {
 	0, 4, 8, 12,
 };

 static int softr_zeroc_values[] = {
 	0, 64, 128, 192,
 };

 static const struct soc_enum chan_mix_enum =
 	SOC_ENUM_SINGLE(CS4349_VMI, 0,
 			ARRAY_SIZE(chan_mix_texts),
 			chan_mix_texts);

 static const struct soc_enum fm_mode_enum =
 	SOC_ENUM_SINGLE(CS4349_MODE, 0,
 			ARRAY_SIZE(fm_texts),
 			fm_texts);

 static SOC_VALUE_ENUM_SINGLE_DECL(deemph_enum, CS4349_MODE, 0, DEM_MASK,
 				deemph_texts, deemph_values);

 static SOC_VALUE_ENUM_SINGLE_DECL(softr_zeroc_enum, CS4349_RMPFLT, 0,
 				SR_ZC_MASK, softr_zeroc_texts,
 				softr_zeroc_values);

 static const struct snd_kcontrol_new cs4349_snd_controls[] = {
 	SOC_DOUBLE_R_TLV("Master Playback Volume",
 			 CS4349_VOLA, CS4349_VOLB, 0, 0xFF, 1, dig_tlv),
 	SOC_ENUM("Functional Mode", fm_mode_enum),
 	SOC_ENUM("De-Emphasis Control", deemph_enum),
 	SOC_ENUM("Soft Ramp Zero Cross Control", softr_zeroc_enum),
 	SOC_ENUM("Channel Mixer", chan_mix_enum),
 	SOC_SINGLE("VolA = VolB Switch", CS4349_VMI, 7, 1, 0),
 	SOC_SINGLE("InvertA Switch", CS4349_VMI, 6, 1, 0),
 	SOC_SINGLE("InvertB Switch", CS4349_VMI, 5, 1, 0),
 	SOC_SINGLE("Auto-Mute Switch", CS4349_MUTE, 7, 1, 0),
 	SOC_SINGLE("MUTEC A = B Switch", CS4349_MUTE, 5, 1, 0),
 	SOC_SINGLE("Soft Ramp Up Switch", CS4349_RMPFLT, 5, 1, 0),
 	SOC_SINGLE("Soft Ramp Down Switch", CS4349_RMPFLT, 4, 1, 0),
 	SOC_SINGLE("Slow Roll Off Filter Switch", CS4349_RMPFLT, 2, 1, 0),
 	SOC_SINGLE("Freeze Switch", CS4349_MISC, 5, 1, 0),
 	SOC_SINGLE("Popguard Switch", CS4349_MISC, 4, 1, 0),
 };

 static const struct snd_soc_dapm_widget cs4349_dapm_widgets[] = {
 	SND_SOC_DAPM_DAC("HiFi DAC", NULL, SND_SOC_NOPM, 0, 0),

 	SND_SOC_DAPM_OUTPUT("OutputA"),
 	SND_SOC_DAPM_OUTPUT("OutputB"),
 };

 static const struct snd_soc_dapm_route cs4349_routes[] = {
 	{"DAC Playback", NULL, "OutputA"},
 	{"DAC Playback", NULL, "OutputB"},

 	{"OutputA", NULL, "HiFi DAC"},
 	{"OutputB", NULL, "HiFi DAC"},
 };

 #define CS4349_PCM_FORMATS (SNDRV_PCM_FMTBIT_S8  | SNDRV_PCM_FMTBIT_S16_LE  | \
 			SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S20_3LE | \
 			SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_LE  | \
 			SNDRV_PCM_FMTBIT_S32_LE)

 #define CS4349_PCM_RATES SNDRV_PCM_RATE_8000_192000

 static const struct snd_soc_dai_ops cs4349_dai_ops = {
 	.hw_params	= cs4349_pcm_hw_params,
 	.set_fmt	= cs4349_set_dai_fmt,
 	.mute_stream	= cs4349_mute,
 	.no_capture_mute = 1,
 };

 static struct snd_soc_dai_driver cs4349_dai = {
 	.name = "cs4349_hifi",
 	.playback = {
 		.stream_name	= "DAC Playback",
 		.channels_min	= 1,
 		.channels_max	= 2,
 		.rates		= CS4349_PCM_RATES,
 		.formats	= CS4349_PCM_FORMATS,
 	},
 	.ops = &cs4349_dai_ops,
 	.symmetric_rate = 1,
 };

 static const struct snd_soc_component_driver soc_component_dev_cs4349 = {
 	.controls		= cs4349_snd_controls,
 	.num_controls		= ARRAY_SIZE(cs4349_snd_controls),
 	.dapm_widgets		= cs4349_dapm_widgets,
 	.num_dapm_widgets	= ARRAY_SIZE(cs4349_dapm_widgets),
 	.dapm_routes		= cs4349_routes,
 	.num_dapm_routes	= ARRAY_SIZE(cs4349_routes),
 	.idle_bias_on		= 1,
 	.use_pmdown_time	= 1,
 	.endianness		= 1,
 };

 static const struct regmap_config cs4349_regmap = {
 	.reg_bits		= 8,
 	.val_bits		= 8,

 	.max_register		= CS4349_MISC,
 	.reg_defaults		= cs4349_reg_defaults,
 	.num_reg_defaults	= ARRAY_SIZE(cs4349_reg_defaults),
 	.readable_reg		= cs4349_readable_register,
 	.writeable_reg		= cs4349_writeable_register,
 	.cache_type		= REGCACHE_MAPLE,
 };

 static int cs4349_i2c_probe(struct i2c_client *client)
 {
 	struct cs4349_private *cs4349;
 	int ret;

 	cs4349 = devm_kzalloc(&client->dev, sizeof(*cs4349), GFP_KERNEL);
 	if (!cs4349)
 		return -ENOMEM;

 	cs4349->regmap = devm_regmap_init_i2c(client, &cs4349_regmap);
 	if (IS_ERR(cs4349->regmap)) {
 		ret = PTR_ERR(cs4349->regmap);
 		dev_err(&client->dev, "regmap_init() failed: %d\n", ret);
 		return ret;
 	}

 	/* Reset the Device */
 	cs4349->reset_gpio = devm_gpiod_get_optional(&client->dev,
 		"reset", GPIOD_OUT_LOW);
 	if (IS_ERR(cs4349->reset_gpio))
 		return PTR_ERR(cs4349->reset_gpio);

 	gpiod_set_value_cansleep(cs4349->reset_gpio, 1);

 	i2c_set_clientdata(client, cs4349);

 	return devm_snd_soc_register_component(&client->dev,
 		&soc_component_dev_cs4349,
 		&cs4349_dai, 1);
 }

 static void cs4349_i2c_remove(struct i2c_client *client)
 {
 	struct cs4349_private *cs4349 = i2c_get_clientdata(client);

 	/* Hold down reset */
 	gpiod_set_value_cansleep(cs4349->reset_gpio, 0);
 }

 #ifdef CONFIG_PM
 static int cs4349_runtime_suspend(struct device *dev)
 {
 	struct cs4349_private *cs4349 = dev_get_drvdata(dev);
 	int ret;

 	ret = regmap_update_bits(cs4349->regmap, CS4349_MISC, PWR_DWN, PWR_DWN);
 	if (ret < 0)
 		return ret;

 	regcache_cache_only(cs4349->regmap, true);

 	/* Hold down reset */
 	gpiod_set_value_cansleep(cs4349->reset_gpio, 0);

 	return 0;
 }

 static int cs4349_runtime_resume(struct device *dev)
 {
 	struct cs4349_private *cs4349 = dev_get_drvdata(dev);
 	int ret;

 	ret = regmap_update_bits(cs4349->regmap, CS4349_MISC, PWR_DWN, 0);
 	if (ret < 0)
 		return ret;

 	gpiod_set_value_cansleep(cs4349->reset_gpio, 1);

 	regcache_cache_only(cs4349->regmap, false);
 	regcache_sync(cs4349->regmap);

 	return 0;
 }
 #endif

 static const struct dev_pm_ops cs4349_runtime_pm = {
 	SET_RUNTIME_PM_OPS(cs4349_runtime_suspend, cs4349_runtime_resume,
 			   NULL)
 };

 static const struct of_device_id cs4349_of_match[] = {
 	{ .compatible = "cirrus,cs4349", },
 	{},
 };

 MODULE_DEVICE_TABLE(of, cs4349_of_match);

 static const struct i2c_device_id cs4349_i2c_id[] = {
 	{"cs4349"},
 	{}
 };

 MODULE_DEVICE_TABLE(i2c, cs4349_i2c_id);

 static struct i2c_driver cs4349_i2c_driver = {
 	.driver = {
 		.name		= "cs4349",
 		.of_match_table	= cs4349_of_match,
 		.pm = &cs4349_runtime_pm,
 	},
 	.id_table	= cs4349_i2c_id,
 	.probe		= cs4349_i2c_probe,
 	.remove		= cs4349_i2c_remove,
 };

 module_i2c_driver(cs4349_i2c_driver);

 MODULE_AUTHOR("Tim Howe <tim.howe@cirrus.com>");
 MODULE_DESCRIPTION("Cirrus Logic CS4349 ALSA SoC Codec Driver");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* cs4349.c -- CS4349 ALSA Soc Audio driver
	*
	* Copyright 2015 Cirrus Logic, Inc.
	*
	* Authors: Tim Howe <Tim.Howe@cirrus.com>
	*/

	#include <linux/mod_devicetable.h>
	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/gpio/consumer.h>
	#include <linux/platform_device.h>
	#include <linux/pm.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/soc-dapm.h>
	#include <sound/initval.h>
	#include <sound/tlv.h>
	#include "cs4349.h"


	static const struct reg_default cs4349_reg_defaults[] = {
	{ 2, 0x00 }, /* r02 - Mode Control */
	{ 3, 0x09 }, /* r03 - Volume, Mixing and Inversion Control */
	{ 4, 0x81 }, /* r04 - Mute Control */
	{ 5, 0x00 }, /* r05 - Channel A Volume Control */
	{ 6, 0x00 }, /* r06 - Channel B Volume Control */
	{ 7, 0xB1 }, /* r07 - Ramp and Filter Control */
	{ 8, 0x1C }, /* r08 - Misc. Control */
	};

	/* Private data for the CS4349 */
	struct cs4349_private {
	struct regmap *regmap;
	struct gpio_desc *reset_gpio;
	unsigned int mode;
	int rate;
	};

	static bool cs4349_readable_register(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case CS4349_CHIPID ... CS4349_MISC:
	return true;
	default:
	return false;
	}
	}

	static bool cs4349_writeable_register(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case CS4349_MODE ... CS4349_MISC:
	return true;
	default:
	return false;
	}
	}

	static int cs4349_set_dai_fmt(struct snd_soc_dai *codec_dai,
	unsigned int format)
	{
	struct snd_soc_component *component = codec_dai->component;
	struct cs4349_private *cs4349 = snd_soc_component_get_drvdata(component);
	unsigned int fmt;

	fmt = format & SND_SOC_DAIFMT_FORMAT_MASK;

	switch (fmt) {
	case SND_SOC_DAIFMT_I2S:
	case SND_SOC_DAIFMT_LEFT_J:
	case SND_SOC_DAIFMT_RIGHT_J:
	cs4349->mode = format & SND_SOC_DAIFMT_FORMAT_MASK;
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int cs4349_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_component *component = dai->component;
	struct cs4349_private *cs4349 = snd_soc_component_get_drvdata(component);
	int fmt, ret;

	cs4349->rate = params_rate(params);

	switch (cs4349->mode) {
	case SND_SOC_DAIFMT_I2S:
	fmt = DIF_I2S;
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	fmt = DIF_LEFT_JST;
	break;
	case SND_SOC_DAIFMT_RIGHT_J:
	switch (params_width(params)) {
	case 16:
	fmt = DIF_RGHT_JST16;
	break;
	case 24:
	fmt = DIF_RGHT_JST24;
	break;
	default:
	return -EINVAL;
	}
	break;
	default:
	return -EINVAL;
	}

	ret = snd_soc_component_update_bits(component, CS4349_MODE, DIF_MASK,
	MODE_FORMAT(fmt));
	if (ret < 0)
	return ret;

	return 0;
	}

	static int cs4349_mute(struct snd_soc_dai *dai, int mute, int direction)
	{
	struct snd_soc_component *component = dai->component;
	int reg;

	reg = 0;
	if (mute)
	reg = MUTE_AB_MASK;

	return snd_soc_component_update_bits(component, CS4349_MUTE, MUTE_AB_MASK, reg);
	}

	static DECLARE_TLV_DB_SCALE(dig_tlv, -12750, 50, 0);

	static const char * const chan_mix_texts[] = {
	"Mute", "MuteA", "MuteA SwapB", "MuteA MonoB", "SwapA MuteB",
	"BothR", "Swap", "SwapA MonoB", "MuteB", "Normal", "BothL",
	"MonoB", "MonoA MuteB", "MonoA", "MonoA SwapB", "Mono",
	/Normal == Channel A = Left, Channel B = Right/
	};

	static const char * const fm_texts[] = {
	"Auto", "Single", "Double", "Quad",
	};

	static const char * const deemph_texts[] = {
	"None", "44.1k", "48k", "32k",
	};

	static const char * const softr_zeroc_texts[] = {
	"Immediate", "Zero Cross", "Soft Ramp", "SR on ZC",
	};

	static int deemph_values[] = {
	0, 4, 8, 12,
	};

	static int softr_zeroc_values[] = {
	0, 64, 128, 192,
	};

	static const struct soc_enum chan_mix_enum =
	SOC_ENUM_SINGLE(CS4349_VMI, 0,
	ARRAY_SIZE(chan_mix_texts),
	chan_mix_texts);

	static const struct soc_enum fm_mode_enum =
	SOC_ENUM_SINGLE(CS4349_MODE, 0,
	ARRAY_SIZE(fm_texts),
	fm_texts);

	static SOC_VALUE_ENUM_SINGLE_DECL(deemph_enum, CS4349_MODE, 0, DEM_MASK,
	deemph_texts, deemph_values);

	static SOC_VALUE_ENUM_SINGLE_DECL(softr_zeroc_enum, CS4349_RMPFLT, 0,
	SR_ZC_MASK, softr_zeroc_texts,
	softr_zeroc_values);

	static const struct snd_kcontrol_new cs4349_snd_controls[] = {
	SOC_DOUBLE_R_TLV("Master Playback Volume",
	CS4349_VOLA, CS4349_VOLB, 0, 0xFF, 1, dig_tlv),
	SOC_ENUM("Functional Mode", fm_mode_enum),
	SOC_ENUM("De-Emphasis Control", deemph_enum),
	SOC_ENUM("Soft Ramp Zero Cross Control", softr_zeroc_enum),
	SOC_ENUM("Channel Mixer", chan_mix_enum),
	SOC_SINGLE("VolA = VolB Switch", CS4349_VMI, 7, 1, 0),
	SOC_SINGLE("InvertA Switch", CS4349_VMI, 6, 1, 0),
	SOC_SINGLE("InvertB Switch", CS4349_VMI, 5, 1, 0),
	SOC_SINGLE("Auto-Mute Switch", CS4349_MUTE, 7, 1, 0),
	SOC_SINGLE("MUTEC A = B Switch", CS4349_MUTE, 5, 1, 0),
	SOC_SINGLE("Soft Ramp Up Switch", CS4349_RMPFLT, 5, 1, 0),
	SOC_SINGLE("Soft Ramp Down Switch", CS4349_RMPFLT, 4, 1, 0),
	SOC_SINGLE("Slow Roll Off Filter Switch", CS4349_RMPFLT, 2, 1, 0),
	SOC_SINGLE("Freeze Switch", CS4349_MISC, 5, 1, 0),
	SOC_SINGLE("Popguard Switch", CS4349_MISC, 4, 1, 0),
	};

	static const struct snd_soc_dapm_widget cs4349_dapm_widgets[] = {
	SND_SOC_DAPM_DAC("HiFi DAC", NULL, SND_SOC_NOPM, 0, 0),

	SND_SOC_DAPM_OUTPUT("OutputA"),
	SND_SOC_DAPM_OUTPUT("OutputB"),
	};

	static const struct snd_soc_dapm_route cs4349_routes[] = {
	{"DAC Playback", NULL, "OutputA"},
	{"DAC Playback", NULL, "OutputB"},

	{"OutputA", NULL, "HiFi DAC"},
	{"OutputB", NULL, "HiFi DAC"},
	};

	#define CS4349_PCM_FORMATS (SNDRV_PCM_FMTBIT_S8 \| SNDRV_PCM_FMTBIT_S16_LE \| \
	SNDRV_PCM_FMTBIT_S18_3LE \| SNDRV_PCM_FMTBIT_S20_3LE \| \
	SNDRV_PCM_FMTBIT_S24_3LE \| SNDRV_PCM_FMTBIT_S24_LE \| \
	SNDRV_PCM_FMTBIT_S32_LE)

	#define CS4349_PCM_RATES SNDRV_PCM_RATE_8000_192000

	static const struct snd_soc_dai_ops cs4349_dai_ops = {
	.hw_params = cs4349_pcm_hw_params,
	.set_fmt = cs4349_set_dai_fmt,
	.mute_stream = cs4349_mute,
	.no_capture_mute = 1,
	};

	static struct snd_soc_dai_driver cs4349_dai = {
	.name = "cs4349_hifi",
	.playback = {
	.stream_name = "DAC Playback",
	.channels_min = 1,
	.channels_max = 2,
	.rates = CS4349_PCM_RATES,
	.formats = CS4349_PCM_FORMATS,
	},
	.ops = &cs4349_dai_ops,
	.symmetric_rate = 1,
	};

	static const struct snd_soc_component_driver soc_component_dev_cs4349 = {
	.controls = cs4349_snd_controls,
	.num_controls = ARRAY_SIZE(cs4349_snd_controls),
	.dapm_widgets = cs4349_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(cs4349_dapm_widgets),
	.dapm_routes = cs4349_routes,
	.num_dapm_routes = ARRAY_SIZE(cs4349_routes),
	.idle_bias_on = 1,
	.use_pmdown_time = 1,
	.endianness = 1,
	};

	static const struct regmap_config cs4349_regmap = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = CS4349_MISC,
	.reg_defaults = cs4349_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(cs4349_reg_defaults),
	.readable_reg = cs4349_readable_register,
	.writeable_reg = cs4349_writeable_register,
	.cache_type = REGCACHE_MAPLE,
	};

	static int cs4349_i2c_probe(struct i2c_client *client)
	{
	struct cs4349_private *cs4349;
	int ret;

	cs4349 = devm_kzalloc(&client->dev, sizeof(*cs4349), GFP_KERNEL);
	if (!cs4349)
	return -ENOMEM;

	cs4349->regmap = devm_regmap_init_i2c(client, &cs4349_regmap);
	if (IS_ERR(cs4349->regmap)) {
	ret = PTR_ERR(cs4349->regmap);
	dev_err(&client->dev, "regmap_init() failed: %d\n", ret);
	return ret;
	}

	/* Reset the Device */
	cs4349->reset_gpio = devm_gpiod_get_optional(&client->dev,
	"reset", GPIOD_OUT_LOW);
	if (IS_ERR(cs4349->reset_gpio))
	return PTR_ERR(cs4349->reset_gpio);

	gpiod_set_value_cansleep(cs4349->reset_gpio, 1);

	i2c_set_clientdata(client, cs4349);

	return devm_snd_soc_register_component(&client->dev,
	&soc_component_dev_cs4349,
	&cs4349_dai, 1);
	}

	static void cs4349_i2c_remove(struct i2c_client *client)
	{
	struct cs4349_private *cs4349 = i2c_get_clientdata(client);

	/* Hold down reset */
	gpiod_set_value_cansleep(cs4349->reset_gpio, 0);
	}

	#ifdef CONFIG_PM
	static int cs4349_runtime_suspend(struct device *dev)
	{
	struct cs4349_private *cs4349 = dev_get_drvdata(dev);
	int ret;

	ret = regmap_update_bits(cs4349->regmap, CS4349_MISC, PWR_DWN, PWR_DWN);
	if (ret < 0)
	return ret;

	regcache_cache_only(cs4349->regmap, true);

	/* Hold down reset */
	gpiod_set_value_cansleep(cs4349->reset_gpio, 0);

	return 0;
	}

	static int cs4349_runtime_resume(struct device *dev)
	{
	struct cs4349_private *cs4349 = dev_get_drvdata(dev);
	int ret;

	ret = regmap_update_bits(cs4349->regmap, CS4349_MISC, PWR_DWN, 0);
	if (ret < 0)
	return ret;

	gpiod_set_value_cansleep(cs4349->reset_gpio, 1);

	regcache_cache_only(cs4349->regmap, false);
	regcache_sync(cs4349->regmap);

	return 0;
	}
	#endif

	static const struct dev_pm_ops cs4349_runtime_pm = {
	SET_RUNTIME_PM_OPS(cs4349_runtime_suspend, cs4349_runtime_resume,
	NULL)
	};

	static const struct of_device_id cs4349_of_match[] = {
	{ .compatible = "cirrus,cs4349", },
	{},
	};

	MODULE_DEVICE_TABLE(of, cs4349_of_match);

	static const struct i2c_device_id cs4349_i2c_id[] = {
	{"cs4349"},
	{}
	};

	MODULE_DEVICE_TABLE(i2c, cs4349_i2c_id);

	static struct i2c_driver cs4349_i2c_driver = {
	.driver = {
	.name = "cs4349",
	.of_match_table = cs4349_of_match,
	.pm = &cs4349_runtime_pm,
	},
	.id_table = cs4349_i2c_id,
	.probe = cs4349_i2c_probe,
	.remove = cs4349_i2c_remove,
	};

	module_i2c_driver(cs4349_i2c_driver);

	MODULE_AUTHOR("Tim Howe <tim.howe@cirrus.com>");
	MODULE_DESCRIPTION("Cirrus Logic CS4349 ALSA SoC Codec Driver");
	MODULE_LICENSE("GPL");