sound/soc/codecs/cs4265.c - linux-mtk - Git at Google

 /*
  * cs4265.c -- CS4265 ALSA SoC audio driver
  *
  * Copyright 2014 Cirrus Logic, Inc.
  *
  * Author: Paul Handrigan <paul.handrigan@cirrus.com>
  *
  * 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.
  *
  */

 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/kernel.h>
 #include <linux/gpio/consumer.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/input.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <linux/platform_device.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 "cs4265.h"

 struct cs4265_private {
 	struct regmap *regmap;
 	struct gpio_desc *reset_gpio;
 	u8 format;
 	u32 sysclk;
 };

 static const struct reg_default cs4265_reg_defaults[] = {
 	{ CS4265_PWRCTL, 0x0F },
 	{ CS4265_DAC_CTL, 0x08 },
 	{ CS4265_ADC_CTL, 0x00 },
 	{ CS4265_MCLK_FREQ, 0x00 },
 	{ CS4265_SIG_SEL, 0x40 },
 	{ CS4265_CHB_PGA_CTL, 0x00 },
 	{ CS4265_CHA_PGA_CTL, 0x00 },
 	{ CS4265_ADC_CTL2, 0x19 },
 	{ CS4265_DAC_CHA_VOL, 0x00 },
 	{ CS4265_DAC_CHB_VOL, 0x00 },
 	{ CS4265_DAC_CTL2, 0xC0 },
 	{ CS4265_SPDIF_CTL1, 0x00 },
 	{ CS4265_SPDIF_CTL2, 0x00 },
 	{ CS4265_INT_MASK, 0x00 },
 	{ CS4265_STATUS_MODE_MSB, 0x00 },
 	{ CS4265_STATUS_MODE_LSB, 0x00 },
 };

 static bool cs4265_readable_register(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case CS4265_CHIP_ID ... CS4265_MAX_REGISTER:
 		return true;
 	default:
 		return false;
 	}
 }

 static bool cs4265_volatile_register(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case CS4265_INT_STATUS:
 		return true;
 	default:
 		return false;
 	}
 }

 static DECLARE_TLV_DB_SCALE(pga_tlv, -1200, 50, 0);

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

 static const char * const digital_input_mux_text[] = {
 	"SDIN1", "SDIN2"
 };

 static SOC_ENUM_SINGLE_DECL(digital_input_mux_enum, CS4265_SIG_SEL, 7,
 		digital_input_mux_text);

 static const struct snd_kcontrol_new digital_input_mux =
 	SOC_DAPM_ENUM("Digital Input Mux", digital_input_mux_enum);

 static const char * const mic_linein_text[] = {
 	"MIC", "LINEIN"
 };

 static SOC_ENUM_SINGLE_DECL(mic_linein_enum, CS4265_ADC_CTL2, 0,
 		mic_linein_text);

 static const char * const cam_mode_text[] = {
 	"One Byte", "Two Byte"
 };

 static SOC_ENUM_SINGLE_DECL(cam_mode_enum, CS4265_SPDIF_CTL1, 5,
 		cam_mode_text);

 static const char * const cam_mono_stereo_text[] = {
 	"Stereo", "Mono"
 };

 static SOC_ENUM_SINGLE_DECL(spdif_mono_stereo_enum, CS4265_SPDIF_CTL2, 2,
 		cam_mono_stereo_text);

 static const char * const mono_select_text[] = {
 	"Channel A", "Channel B"
 };

 static SOC_ENUM_SINGLE_DECL(spdif_mono_select_enum, CS4265_SPDIF_CTL2, 0,
 		mono_select_text);

 static const struct snd_kcontrol_new mic_linein_mux =
 	SOC_DAPM_ENUM("ADC Input Capture Mux", mic_linein_enum);

 static const struct snd_kcontrol_new loopback_ctl =
 	SOC_DAPM_SINGLE("Switch", CS4265_SIG_SEL, 1, 1, 0);

 static const struct snd_kcontrol_new spdif_switch =
 	SOC_DAPM_SINGLE("Switch", SND_SOC_NOPM, 0, 0, 0);

 static const struct snd_kcontrol_new dac_switch =
 	SOC_DAPM_SINGLE("Switch", CS4265_PWRCTL, 1, 1, 0);

 static const struct snd_kcontrol_new cs4265_snd_controls[] = {

 	SOC_DOUBLE_R_SX_TLV("PGA Volume", CS4265_CHA_PGA_CTL,
 			      CS4265_CHB_PGA_CTL, 0, 0x28, 0x30, pga_tlv),
 	SOC_DOUBLE_R_TLV("DAC Volume", CS4265_DAC_CHA_VOL,
 		      CS4265_DAC_CHB_VOL, 0, 0xFF, 1, dac_tlv),
 	SOC_SINGLE("De-emp 44.1kHz Switch", CS4265_DAC_CTL, 1,
 				1, 0),
 	SOC_SINGLE("DAC INV Switch", CS4265_DAC_CTL2, 5,
 				1, 0),
 	SOC_SINGLE("DAC Zero Cross Switch", CS4265_DAC_CTL2, 6,
 				1, 0),
 	SOC_SINGLE("DAC Soft Ramp Switch", CS4265_DAC_CTL2, 7,
 				1, 0),
 	SOC_SINGLE("ADC HPF Switch", CS4265_ADC_CTL, 1,
 				1, 0),
 	SOC_SINGLE("ADC Zero Cross Switch", CS4265_ADC_CTL2, 3,
 				1, 1),
 	SOC_SINGLE("ADC Soft Ramp Switch", CS4265_ADC_CTL2, 7,
 				1, 0),
 	SOC_SINGLE("E to F Buffer Disable Switch", CS4265_SPDIF_CTL1,
 				6, 1, 0),
 	SOC_ENUM("C Data Access", cam_mode_enum),
 	SOC_SINGLE("Validity Bit Control Switch", CS4265_SPDIF_CTL2,
 				3, 1, 0),
 	SOC_ENUM("SPDIF Mono/Stereo", spdif_mono_stereo_enum),
 	SOC_SINGLE("MMTLR Data Switch", CS4265_SPDIF_CTL2,
 				0, 1, 0),
 	SOC_ENUM("Mono Channel Select", spdif_mono_select_enum),
 	SND_SOC_BYTES("C Data Buffer", CS4265_C_DATA_BUFF, 24),
 };

 static const struct snd_soc_dapm_widget cs4265_dapm_widgets[] = {

 	SND_SOC_DAPM_INPUT("LINEINL"),
 	SND_SOC_DAPM_INPUT("LINEINR"),
 	SND_SOC_DAPM_INPUT("MICL"),
 	SND_SOC_DAPM_INPUT("MICR"),

 	SND_SOC_DAPM_AIF_OUT("DOUT", NULL,  0,
 			SND_SOC_NOPM, 0, 0),
 	SND_SOC_DAPM_AIF_OUT("SPDIFOUT", NULL,  0,
 			SND_SOC_NOPM, 0, 0),

 	SND_SOC_DAPM_MUX("ADC Mux", SND_SOC_NOPM, 0, 0, &mic_linein_mux),

 	SND_SOC_DAPM_ADC("ADC", NULL, CS4265_PWRCTL, 2, 1),
 	SND_SOC_DAPM_PGA("Pre-amp MIC", CS4265_PWRCTL, 3,
 			1, NULL, 0),

 	SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM,
 			 0, 0, &digital_input_mux),

 	SND_SOC_DAPM_MIXER("SDIN1 Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
 	SND_SOC_DAPM_MIXER("SDIN2 Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
 	SND_SOC_DAPM_MIXER("SPDIF Transmitter", SND_SOC_NOPM, 0, 0, NULL, 0),

 	SND_SOC_DAPM_SWITCH("Loopback", SND_SOC_NOPM, 0, 0,
 			&loopback_ctl),
 	SND_SOC_DAPM_SWITCH("SPDIF", SND_SOC_NOPM, 0, 0,
 			&spdif_switch),
 	SND_SOC_DAPM_SWITCH("DAC", CS4265_PWRCTL, 1, 1,
 			&dac_switch),

 	SND_SOC_DAPM_AIF_IN("DIN1", NULL,  0,
 			SND_SOC_NOPM, 0, 0),
 	SND_SOC_DAPM_AIF_IN("DIN2", NULL,  0,
 			SND_SOC_NOPM, 0, 0),
 	SND_SOC_DAPM_AIF_IN("TXIN", NULL,  0,
 			CS4265_SPDIF_CTL2, 5, 1),

 	SND_SOC_DAPM_OUTPUT("LINEOUTL"),
 	SND_SOC_DAPM_OUTPUT("LINEOUTR"),

 };

 static const struct snd_soc_dapm_route cs4265_audio_map[] = {

 	{"DIN1", NULL, "DAI1 Playback"},
 	{"DIN2", NULL, "DAI2 Playback"},
 	{"SDIN1 Input Mixer", NULL, "DIN1"},
 	{"SDIN2 Input Mixer", NULL, "DIN2"},
 	{"Input Mux", "SDIN1", "SDIN1 Input Mixer"},
 	{"Input Mux", "SDIN2", "SDIN2 Input Mixer"},
 	{"DAC", "Switch", "Input Mux"},
 	{"SPDIF", "Switch", "Input Mux"},
 	{"LINEOUTL", NULL, "DAC"},
 	{"LINEOUTR", NULL, "DAC"},
 	{"SPDIFOUT", NULL, "SPDIF"},

 	{"ADC Mux", "LINEIN", "LINEINL"},
 	{"ADC Mux", "LINEIN", "LINEINR"},
 	{"ADC Mux", "MIC", "MICL"},
 	{"ADC Mux", "MIC", "MICR"},
 	{"ADC", NULL, "ADC Mux"},
 	{"DOUT", NULL, "ADC"},
 	{"DAI1 Capture", NULL, "DOUT"},
 	{"DAI2 Capture", NULL, "DOUT"},

 	/* Loopback */
 	{"Loopback", "Switch", "ADC"},
 	{"DAC", NULL, "Loopback"},
 };

 struct cs4265_clk_para {
 	u32 mclk;
 	u32 rate;
 	u8 fm_mode; /* values 1, 2, or 4 */
 	u8 mclkdiv;
 };

 static const struct cs4265_clk_para clk_map_table[] = {
 	/*32k*/
 	{8192000, 32000, 0, 0},
 	{12288000, 32000, 0, 1},
 	{16384000, 32000, 0, 2},
 	{24576000, 32000, 0, 3},
 	{32768000, 32000, 0, 4},

 	/*44.1k*/
 	{11289600, 44100, 0, 0},
 	{16934400, 44100, 0, 1},
 	{22579200, 44100, 0, 2},
 	{33868000, 44100, 0, 3},
 	{45158400, 44100, 0, 4},

 	/*48k*/
 	{12288000, 48000, 0, 0},
 	{18432000, 48000, 0, 1},
 	{24576000, 48000, 0, 2},
 	{36864000, 48000, 0, 3},
 	{49152000, 48000, 0, 4},

 	/*64k*/
 	{8192000, 64000, 1, 0},
 	{12288000, 64000, 1, 1},
 	{16934400, 64000, 1, 2},
 	{24576000, 64000, 1, 3},
 	{32768000, 64000, 1, 4},

 	/* 88.2k */
 	{11289600, 88200, 1, 0},
 	{16934400, 88200, 1, 1},
 	{22579200, 88200, 1, 2},
 	{33868000, 88200, 1, 3},
 	{45158400, 88200, 1, 4},

 	/* 96k */
 	{12288000, 96000, 1, 0},
 	{18432000, 96000, 1, 1},
 	{24576000, 96000, 1, 2},
 	{36864000, 96000, 1, 3},
 	{49152000, 96000, 1, 4},

 	/* 128k */
 	{8192000, 128000, 2, 0},
 	{12288000, 128000, 2, 1},
 	{16934400, 128000, 2, 2},
 	{24576000, 128000, 2, 3},
 	{32768000, 128000, 2, 4},

 	/* 176.4k */
 	{11289600, 176400, 2, 0},
 	{16934400, 176400, 2, 1},
 	{22579200, 176400, 2, 2},
 	{33868000, 176400, 2, 3},
 	{49152000, 176400, 2, 4},

 	/* 192k */
 	{12288000, 192000, 2, 0},
 	{18432000, 192000, 2, 1},
 	{24576000, 192000, 2, 2},
 	{36864000, 192000, 2, 3},
 	{49152000, 192000, 2, 4},
 };

 static int cs4265_get_clk_index(int mclk, int rate)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(clk_map_table); i++) {
 		if (clk_map_table[i].rate == rate &&
 				clk_map_table[i].mclk == mclk)
 			return i;
 	}
 	return -EINVAL;
 }

 static int cs4265_set_sysclk(struct snd_soc_dai *codec_dai, int clk_id,
 			unsigned int freq, int dir)
 {
 	struct snd_soc_component *component = codec_dai->component;
 	struct cs4265_private *cs4265 = snd_soc_component_get_drvdata(component);
 	int i;

 	if (clk_id != 0) {
 		dev_err(component->dev, "Invalid clk_id %d\n", clk_id);
 		return -EINVAL;
 	}
 	for (i = 0; i < ARRAY_SIZE(clk_map_table); i++) {
 		if (clk_map_table[i].mclk == freq) {
 			cs4265->sysclk = freq;
 			return 0;
 		}
 	}
 	cs4265->sysclk = 0;
 	dev_err(component->dev, "Invalid freq parameter %d\n", freq);
 	return -EINVAL;
 }

 static int cs4265_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
 {
 	struct snd_soc_component *component = codec_dai->component;
 	struct cs4265_private *cs4265 = snd_soc_component_get_drvdata(component);
 	u8 iface = 0;

 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBM_CFM:
 		snd_soc_component_update_bits(component, CS4265_ADC_CTL,
 				CS4265_ADC_MASTER,
 				CS4265_ADC_MASTER);
 		break;
 	case SND_SOC_DAIFMT_CBS_CFS:
 		snd_soc_component_update_bits(component, CS4265_ADC_CTL,
 				CS4265_ADC_MASTER,
 				0);
 		break;
 	default:
 		return -EINVAL;
 	}

 	 /* interface format */
 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_I2S:
 		iface |= SND_SOC_DAIFMT_I2S;
 		break;
 	case SND_SOC_DAIFMT_RIGHT_J:
 		iface |= SND_SOC_DAIFMT_RIGHT_J;
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		iface |= SND_SOC_DAIFMT_LEFT_J;
 		break;
 	default:
 		return -EINVAL;
 	}

 	cs4265->format = iface;
 	return 0;
 }

 static int cs4265_digital_mute(struct snd_soc_dai *dai, int mute)
 {
 	struct snd_soc_component *component = dai->component;

 	if (mute) {
 		snd_soc_component_update_bits(component, CS4265_DAC_CTL,
 			CS4265_DAC_CTL_MUTE,
 			CS4265_DAC_CTL_MUTE);
 		snd_soc_component_update_bits(component, CS4265_SPDIF_CTL2,
 			CS4265_SPDIF_CTL2_MUTE,
 			CS4265_SPDIF_CTL2_MUTE);
 	} else {
 		snd_soc_component_update_bits(component, CS4265_DAC_CTL,
 			CS4265_DAC_CTL_MUTE,
 			0);
 		snd_soc_component_update_bits(component, CS4265_SPDIF_CTL2,
 			CS4265_SPDIF_CTL2_MUTE,
 			0);
 	}
 	return 0;
 }

 static int cs4265_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 cs4265_private *cs4265 = snd_soc_component_get_drvdata(component);
 	int index;

 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
 		((cs4265->format & SND_SOC_DAIFMT_FORMAT_MASK)
 		== SND_SOC_DAIFMT_RIGHT_J))
 		return -EINVAL;

 	index = cs4265_get_clk_index(cs4265->sysclk, params_rate(params));
 	if (index >= 0) {
 		snd_soc_component_update_bits(component, CS4265_ADC_CTL,
 			CS4265_ADC_FM, clk_map_table[index].fm_mode << 6);
 		snd_soc_component_update_bits(component, CS4265_MCLK_FREQ,
 			CS4265_MCLK_FREQ_MASK,
 			clk_map_table[index].mclkdiv << 4);

 	} else {
 		dev_err(component->dev, "can't get correct mclk\n");
 		return -EINVAL;
 	}

 	switch (cs4265->format & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_I2S:
 		snd_soc_component_update_bits(component, CS4265_DAC_CTL,
 			CS4265_DAC_CTL_DIF, (1 << 4));
 		snd_soc_component_update_bits(component, CS4265_ADC_CTL,
 			CS4265_ADC_DIF, (1 << 4));
 		snd_soc_component_update_bits(component, CS4265_SPDIF_CTL2,
 			CS4265_SPDIF_CTL2_DIF, (1 << 6));
 		break;
 	case SND_SOC_DAIFMT_RIGHT_J:
 		if (params_width(params) == 16) {
 			snd_soc_component_update_bits(component, CS4265_DAC_CTL,
 				CS4265_DAC_CTL_DIF, (2 << 4));
 			snd_soc_component_update_bits(component, CS4265_SPDIF_CTL2,
 				CS4265_SPDIF_CTL2_DIF, (2 << 6));
 		} else {
 			snd_soc_component_update_bits(component, CS4265_DAC_CTL,
 				CS4265_DAC_CTL_DIF, (3 << 4));
 			snd_soc_component_update_bits(component, CS4265_SPDIF_CTL2,
 				CS4265_SPDIF_CTL2_DIF, (3 << 6));
 		}
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		snd_soc_component_update_bits(component, CS4265_DAC_CTL,
 			CS4265_DAC_CTL_DIF, 0);
 		snd_soc_component_update_bits(component, CS4265_ADC_CTL,
 			CS4265_ADC_DIF, 0);
 		snd_soc_component_update_bits(component, CS4265_SPDIF_CTL2,
 			CS4265_SPDIF_CTL2_DIF, 0);

 		break;
 	default:
 		return -EINVAL;
 	}
 	return 0;
 }

 static int cs4265_set_bias_level(struct snd_soc_component *component,
 					enum snd_soc_bias_level level)
 {
 	switch (level) {
 	case SND_SOC_BIAS_ON:
 		break;
 	case SND_SOC_BIAS_PREPARE:
 		snd_soc_component_update_bits(component, CS4265_PWRCTL,
 			CS4265_PWRCTL_PDN, 0);
 		break;
 	case SND_SOC_BIAS_STANDBY:
 		snd_soc_component_update_bits(component, CS4265_PWRCTL,
 			CS4265_PWRCTL_PDN,
 			CS4265_PWRCTL_PDN);
 		break;
 	case SND_SOC_BIAS_OFF:
 		snd_soc_component_update_bits(component, CS4265_PWRCTL,
 			CS4265_PWRCTL_PDN,
 			CS4265_PWRCTL_PDN);
 		break;
 	}
 	return 0;
 }

 #define CS4265_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 			SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 | \
 			SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | \
 			SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000)

 #define CS4265_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE | \
 			SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_U24_LE)

 static const struct snd_soc_dai_ops cs4265_ops = {
 	.hw_params	= cs4265_pcm_hw_params,
 	.digital_mute	= cs4265_digital_mute,
 	.set_fmt	= cs4265_set_fmt,
 	.set_sysclk	= cs4265_set_sysclk,
 };

 static struct snd_soc_dai_driver cs4265_dai[] = {
 	{
 		.name = "cs4265-dai1",
 		.playback = {
 			.stream_name = "DAI1 Playback",
 			.channels_min = 1,
 			.channels_max = 2,
 			.rates = CS4265_RATES,
 			.formats = CS4265_FORMATS,
 		},
 		.capture = {
 			.stream_name = "DAI1 Capture",
 			.channels_min = 1,
 			.channels_max = 2,
 			.rates = CS4265_RATES,
 			.formats = CS4265_FORMATS,
 		},
 		.ops = &cs4265_ops,
 	},
 	{
 		.name = "cs4265-dai2",
 		.playback = {
 			.stream_name = "DAI2 Playback",
 			.channels_min = 1,
 			.channels_max = 2,
 			.rates = CS4265_RATES,
 			.formats = CS4265_FORMATS,
 		},
 		.capture = {
 			.stream_name = "DAI2 Capture",
 			.channels_min = 1,
 			.channels_max = 2,
 			.rates = CS4265_RATES,
 			.formats = CS4265_FORMATS,
 		},
 		.ops = &cs4265_ops,
 	},
 };

 static const struct snd_soc_component_driver soc_component_cs4265 = {
 	.set_bias_level		= cs4265_set_bias_level,
 	.controls		= cs4265_snd_controls,
 	.num_controls		= ARRAY_SIZE(cs4265_snd_controls),
 	.dapm_widgets		= cs4265_dapm_widgets,
 	.num_dapm_widgets	= ARRAY_SIZE(cs4265_dapm_widgets),
 	.dapm_routes		= cs4265_audio_map,
 	.num_dapm_routes	= ARRAY_SIZE(cs4265_audio_map),
 	.idle_bias_on		= 1,
 	.use_pmdown_time	= 1,
 	.endianness		= 1,
 	.non_legacy_dai_naming	= 1,
 };

 static const struct regmap_config cs4265_regmap = {
 	.reg_bits = 8,
 	.val_bits = 8,

 	.max_register = CS4265_MAX_REGISTER,
 	.reg_defaults = cs4265_reg_defaults,
 	.num_reg_defaults = ARRAY_SIZE(cs4265_reg_defaults),
 	.readable_reg = cs4265_readable_register,
 	.volatile_reg = cs4265_volatile_register,
 	.cache_type = REGCACHE_RBTREE,
 };

 static int cs4265_i2c_probe(struct i2c_client *i2c_client,
 			     const struct i2c_device_id *id)
 {
 	struct cs4265_private *cs4265;
 	int ret = 0;
 	unsigned int devid = 0;
 	unsigned int reg;

 	cs4265 = devm_kzalloc(&i2c_client->dev, sizeof(struct cs4265_private),
 			       GFP_KERNEL);
 	if (cs4265 == NULL)
 		return -ENOMEM;

 	cs4265->regmap = devm_regmap_init_i2c(i2c_client, &cs4265_regmap);
 	if (IS_ERR(cs4265->regmap)) {
 		ret = PTR_ERR(cs4265->regmap);
 		dev_err(&i2c_client->dev, "regmap_init() failed: %d\n", ret);
 		return ret;
 	}

 	cs4265->reset_gpio = devm_gpiod_get_optional(&i2c_client->dev,
 		"reset", GPIOD_OUT_LOW);
 	if (IS_ERR(cs4265->reset_gpio))
 		return PTR_ERR(cs4265->reset_gpio);

 	if (cs4265->reset_gpio) {
 		mdelay(1);
 		gpiod_set_value_cansleep(cs4265->reset_gpio, 1);
 	}

 	i2c_set_clientdata(i2c_client, cs4265);

 	ret = regmap_read(cs4265->regmap, CS4265_CHIP_ID, &reg);
 	devid = reg & CS4265_CHIP_ID_MASK;
 	if (devid != CS4265_CHIP_ID_VAL) {
 		ret = -ENODEV;
 		dev_err(&i2c_client->dev,
 			"CS4265 Device ID (%X). Expected %X\n",
 			devid, CS4265_CHIP_ID);
 		return ret;
 	}
 	dev_info(&i2c_client->dev,
 		"CS4265 Version %x\n",
 			reg & CS4265_REV_ID_MASK);

 	regmap_write(cs4265->regmap, CS4265_PWRCTL, 0x0F);

 	ret = devm_snd_soc_register_component(&i2c_client->dev,
 			&soc_component_cs4265, cs4265_dai,
 			ARRAY_SIZE(cs4265_dai));
 	return ret;
 }

 static const struct of_device_id cs4265_of_match[] = {
 	{ .compatible = "cirrus,cs4265", },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, cs4265_of_match);

 static const struct i2c_device_id cs4265_id[] = {
 	{ "cs4265", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, cs4265_id);

 static struct i2c_driver cs4265_i2c_driver = {
 	.driver = {
 		.name = "cs4265",
 		.of_match_table = cs4265_of_match,
 	},
 	.id_table = cs4265_id,
 	.probe =    cs4265_i2c_probe,
 };

 module_i2c_driver(cs4265_i2c_driver);

 MODULE_DESCRIPTION("ASoC CS4265 driver");
 MODULE_AUTHOR("Paul Handrigan, Cirrus Logic Inc, <paul.handrigan@cirrus.com>");
 MODULE_LICENSE("GPL");
	/*
	* cs4265.c -- CS4265 ALSA SoC audio driver
	*
	* Copyright 2014 Cirrus Logic, Inc.
	*
	* Author: Paul Handrigan <paul.handrigan@cirrus.com>
	*
	* 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.
	*
	*/

	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/kernel.h>
	#include <linux/gpio/consumer.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/i2c.h>
	#include <linux/input.h>
	#include <linux/regmap.h>
	#include <linux/slab.h>
	#include <linux/platform_device.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 "cs4265.h"

	struct cs4265_private {
	struct regmap *regmap;
	struct gpio_desc *reset_gpio;
	u8 format;
	u32 sysclk;
	};

	static const struct reg_default cs4265_reg_defaults[] = {
	{ CS4265_PWRCTL, 0x0F },
	{ CS4265_DAC_CTL, 0x08 },
	{ CS4265_ADC_CTL, 0x00 },
	{ CS4265_MCLK_FREQ, 0x00 },
	{ CS4265_SIG_SEL, 0x40 },
	{ CS4265_CHB_PGA_CTL, 0x00 },
	{ CS4265_CHA_PGA_CTL, 0x00 },
	{ CS4265_ADC_CTL2, 0x19 },
	{ CS4265_DAC_CHA_VOL, 0x00 },
	{ CS4265_DAC_CHB_VOL, 0x00 },
	{ CS4265_DAC_CTL2, 0xC0 },
	{ CS4265_SPDIF_CTL1, 0x00 },
	{ CS4265_SPDIF_CTL2, 0x00 },
	{ CS4265_INT_MASK, 0x00 },
	{ CS4265_STATUS_MODE_MSB, 0x00 },
	{ CS4265_STATUS_MODE_LSB, 0x00 },
	};

	static bool cs4265_readable_register(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case CS4265_CHIP_ID ... CS4265_MAX_REGISTER:
	return true;
	default:
	return false;
	}
	}

	static bool cs4265_volatile_register(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case CS4265_INT_STATUS:
	return true;
	default:
	return false;
	}
	}

	static DECLARE_TLV_DB_SCALE(pga_tlv, -1200, 50, 0);

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

	static const char * const digital_input_mux_text[] = {
	"SDIN1", "SDIN2"
	};

	static SOC_ENUM_SINGLE_DECL(digital_input_mux_enum, CS4265_SIG_SEL, 7,
	digital_input_mux_text);

	static const struct snd_kcontrol_new digital_input_mux =
	SOC_DAPM_ENUM("Digital Input Mux", digital_input_mux_enum);

	static const char * const mic_linein_text[] = {
	"MIC", "LINEIN"
	};

	static SOC_ENUM_SINGLE_DECL(mic_linein_enum, CS4265_ADC_CTL2, 0,
	mic_linein_text);

	static const char * const cam_mode_text[] = {
	"One Byte", "Two Byte"
	};

	static SOC_ENUM_SINGLE_DECL(cam_mode_enum, CS4265_SPDIF_CTL1, 5,
	cam_mode_text);

	static const char * const cam_mono_stereo_text[] = {
	"Stereo", "Mono"
	};

	static SOC_ENUM_SINGLE_DECL(spdif_mono_stereo_enum, CS4265_SPDIF_CTL2, 2,
	cam_mono_stereo_text);

	static const char * const mono_select_text[] = {
	"Channel A", "Channel B"
	};

	static SOC_ENUM_SINGLE_DECL(spdif_mono_select_enum, CS4265_SPDIF_CTL2, 0,
	mono_select_text);

	static const struct snd_kcontrol_new mic_linein_mux =
	SOC_DAPM_ENUM("ADC Input Capture Mux", mic_linein_enum);

	static const struct snd_kcontrol_new loopback_ctl =
	SOC_DAPM_SINGLE("Switch", CS4265_SIG_SEL, 1, 1, 0);

	static const struct snd_kcontrol_new spdif_switch =
	SOC_DAPM_SINGLE("Switch", SND_SOC_NOPM, 0, 0, 0);

	static const struct snd_kcontrol_new dac_switch =
	SOC_DAPM_SINGLE("Switch", CS4265_PWRCTL, 1, 1, 0);

	static const struct snd_kcontrol_new cs4265_snd_controls[] = {

	SOC_DOUBLE_R_SX_TLV("PGA Volume", CS4265_CHA_PGA_CTL,
	CS4265_CHB_PGA_CTL, 0, 0x28, 0x30, pga_tlv),
	SOC_DOUBLE_R_TLV("DAC Volume", CS4265_DAC_CHA_VOL,
	CS4265_DAC_CHB_VOL, 0, 0xFF, 1, dac_tlv),
	SOC_SINGLE("De-emp 44.1kHz Switch", CS4265_DAC_CTL, 1,
	1, 0),
	SOC_SINGLE("DAC INV Switch", CS4265_DAC_CTL2, 5,
	1, 0),
	SOC_SINGLE("DAC Zero Cross Switch", CS4265_DAC_CTL2, 6,
	1, 0),
	SOC_SINGLE("DAC Soft Ramp Switch", CS4265_DAC_CTL2, 7,
	1, 0),
	SOC_SINGLE("ADC HPF Switch", CS4265_ADC_CTL, 1,
	1, 0),
	SOC_SINGLE("ADC Zero Cross Switch", CS4265_ADC_CTL2, 3,
	1, 1),
	SOC_SINGLE("ADC Soft Ramp Switch", CS4265_ADC_CTL2, 7,
	1, 0),
	SOC_SINGLE("E to F Buffer Disable Switch", CS4265_SPDIF_CTL1,
	6, 1, 0),
	SOC_ENUM("C Data Access", cam_mode_enum),
	SOC_SINGLE("Validity Bit Control Switch", CS4265_SPDIF_CTL2,
	3, 1, 0),
	SOC_ENUM("SPDIF Mono/Stereo", spdif_mono_stereo_enum),
	SOC_SINGLE("MMTLR Data Switch", CS4265_SPDIF_CTL2,
	0, 1, 0),
	SOC_ENUM("Mono Channel Select", spdif_mono_select_enum),
	SND_SOC_BYTES("C Data Buffer", CS4265_C_DATA_BUFF, 24),
	};

	static const struct snd_soc_dapm_widget cs4265_dapm_widgets[] = {

	SND_SOC_DAPM_INPUT("LINEINL"),
	SND_SOC_DAPM_INPUT("LINEINR"),
	SND_SOC_DAPM_INPUT("MICL"),
	SND_SOC_DAPM_INPUT("MICR"),

	SND_SOC_DAPM_AIF_OUT("DOUT", NULL, 0,
	SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_AIF_OUT("SPDIFOUT", NULL, 0,
	SND_SOC_NOPM, 0, 0),

	SND_SOC_DAPM_MUX("ADC Mux", SND_SOC_NOPM, 0, 0, &mic_linein_mux),

	SND_SOC_DAPM_ADC("ADC", NULL, CS4265_PWRCTL, 2, 1),
	SND_SOC_DAPM_PGA("Pre-amp MIC", CS4265_PWRCTL, 3,
	1, NULL, 0),

	SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM,
	0, 0, &digital_input_mux),

	SND_SOC_DAPM_MIXER("SDIN1 Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_MIXER("SDIN2 Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_MIXER("SPDIF Transmitter", SND_SOC_NOPM, 0, 0, NULL, 0),

	SND_SOC_DAPM_SWITCH("Loopback", SND_SOC_NOPM, 0, 0,
	&loopback_ctl),
	SND_SOC_DAPM_SWITCH("SPDIF", SND_SOC_NOPM, 0, 0,
	&spdif_switch),
	SND_SOC_DAPM_SWITCH("DAC", CS4265_PWRCTL, 1, 1,
	&dac_switch),

	SND_SOC_DAPM_AIF_IN("DIN1", NULL, 0,
	SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_AIF_IN("DIN2", NULL, 0,
	SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_AIF_IN("TXIN", NULL, 0,
	CS4265_SPDIF_CTL2, 5, 1),

	SND_SOC_DAPM_OUTPUT("LINEOUTL"),
	SND_SOC_DAPM_OUTPUT("LINEOUTR"),

	};

	static const struct snd_soc_dapm_route cs4265_audio_map[] = {

	{"DIN1", NULL, "DAI1 Playback"},
	{"DIN2", NULL, "DAI2 Playback"},
	{"SDIN1 Input Mixer", NULL, "DIN1"},
	{"SDIN2 Input Mixer", NULL, "DIN2"},
	{"Input Mux", "SDIN1", "SDIN1 Input Mixer"},
	{"Input Mux", "SDIN2", "SDIN2 Input Mixer"},
	{"DAC", "Switch", "Input Mux"},
	{"SPDIF", "Switch", "Input Mux"},
	{"LINEOUTL", NULL, "DAC"},
	{"LINEOUTR", NULL, "DAC"},
	{"SPDIFOUT", NULL, "SPDIF"},

	{"ADC Mux", "LINEIN", "LINEINL"},
	{"ADC Mux", "LINEIN", "LINEINR"},
	{"ADC Mux", "MIC", "MICL"},
	{"ADC Mux", "MIC", "MICR"},
	{"ADC", NULL, "ADC Mux"},
	{"DOUT", NULL, "ADC"},
	{"DAI1 Capture", NULL, "DOUT"},
	{"DAI2 Capture", NULL, "DOUT"},

	/* Loopback */
	{"Loopback", "Switch", "ADC"},
	{"DAC", NULL, "Loopback"},
	};

	struct cs4265_clk_para {
	u32 mclk;
	u32 rate;
	u8 fm_mode; /* values 1, 2, or 4 */
	u8 mclkdiv;
	};

	static const struct cs4265_clk_para clk_map_table[] = {
	/32k/
	{8192000, 32000, 0, 0},
	{12288000, 32000, 0, 1},
	{16384000, 32000, 0, 2},
	{24576000, 32000, 0, 3},
	{32768000, 32000, 0, 4},

	/44.1k/
	{11289600, 44100, 0, 0},
	{16934400, 44100, 0, 1},
	{22579200, 44100, 0, 2},
	{33868000, 44100, 0, 3},
	{45158400, 44100, 0, 4},

	/48k/
	{12288000, 48000, 0, 0},
	{18432000, 48000, 0, 1},
	{24576000, 48000, 0, 2},
	{36864000, 48000, 0, 3},
	{49152000, 48000, 0, 4},

	/64k/
	{8192000, 64000, 1, 0},
	{12288000, 64000, 1, 1},
	{16934400, 64000, 1, 2},
	{24576000, 64000, 1, 3},
	{32768000, 64000, 1, 4},

	/* 88.2k */
	{11289600, 88200, 1, 0},
	{16934400, 88200, 1, 1},
	{22579200, 88200, 1, 2},
	{33868000, 88200, 1, 3},
	{45158400, 88200, 1, 4},

	/* 96k */
	{12288000, 96000, 1, 0},
	{18432000, 96000, 1, 1},
	{24576000, 96000, 1, 2},
	{36864000, 96000, 1, 3},
	{49152000, 96000, 1, 4},

	/* 128k */
	{8192000, 128000, 2, 0},
	{12288000, 128000, 2, 1},
	{16934400, 128000, 2, 2},
	{24576000, 128000, 2, 3},
	{32768000, 128000, 2, 4},

	/* 176.4k */
	{11289600, 176400, 2, 0},
	{16934400, 176400, 2, 1},
	{22579200, 176400, 2, 2},
	{33868000, 176400, 2, 3},
	{49152000, 176400, 2, 4},

	/* 192k */
	{12288000, 192000, 2, 0},
	{18432000, 192000, 2, 1},
	{24576000, 192000, 2, 2},
	{36864000, 192000, 2, 3},
	{49152000, 192000, 2, 4},
	};

	static int cs4265_get_clk_index(int mclk, int rate)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(clk_map_table); i++) {
	if (clk_map_table[i].rate == rate &&
	clk_map_table[i].mclk == mclk)
	return i;
	}
	return -EINVAL;
	}

	static int cs4265_set_sysclk(struct snd_soc_dai *codec_dai, int clk_id,
	unsigned int freq, int dir)
	{
	struct snd_soc_component *component = codec_dai->component;
	struct cs4265_private *cs4265 = snd_soc_component_get_drvdata(component);
	int i;

	if (clk_id != 0) {
	dev_err(component->dev, "Invalid clk_id %d\n", clk_id);
	return -EINVAL;
	}
	for (i = 0; i < ARRAY_SIZE(clk_map_table); i++) {
	if (clk_map_table[i].mclk == freq) {
	cs4265->sysclk = freq;
	return 0;
	}
	}
	cs4265->sysclk = 0;
	dev_err(component->dev, "Invalid freq parameter %d\n", freq);
	return -EINVAL;
	}

	static int cs4265_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
	{
	struct snd_soc_component *component = codec_dai->component;
	struct cs4265_private *cs4265 = snd_soc_component_get_drvdata(component);
	u8 iface = 0;

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
	snd_soc_component_update_bits(component, CS4265_ADC_CTL,
	CS4265_ADC_MASTER,
	CS4265_ADC_MASTER);
	break;
	case SND_SOC_DAIFMT_CBS_CFS:
	snd_soc_component_update_bits(component, CS4265_ADC_CTL,
	CS4265_ADC_MASTER,
	0);
	break;
	default:
	return -EINVAL;
	}

	/* interface format */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
	iface \|= SND_SOC_DAIFMT_I2S;
	break;
	case SND_SOC_DAIFMT_RIGHT_J:
	iface \|= SND_SOC_DAIFMT_RIGHT_J;
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	iface \|= SND_SOC_DAIFMT_LEFT_J;
	break;
	default:
	return -EINVAL;
	}

	cs4265->format = iface;
	return 0;
	}

	static int cs4265_digital_mute(struct snd_soc_dai *dai, int mute)
	{
	struct snd_soc_component *component = dai->component;

	if (mute) {
	snd_soc_component_update_bits(component, CS4265_DAC_CTL,
	CS4265_DAC_CTL_MUTE,
	CS4265_DAC_CTL_MUTE);
	snd_soc_component_update_bits(component, CS4265_SPDIF_CTL2,
	CS4265_SPDIF_CTL2_MUTE,
	CS4265_SPDIF_CTL2_MUTE);
	} else {
	snd_soc_component_update_bits(component, CS4265_DAC_CTL,
	CS4265_DAC_CTL_MUTE,
	0);
	snd_soc_component_update_bits(component, CS4265_SPDIF_CTL2,
	CS4265_SPDIF_CTL2_MUTE,
	0);
	}
	return 0;
	}

	static int cs4265_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 cs4265_private *cs4265 = snd_soc_component_get_drvdata(component);
	int index;

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
	((cs4265->format & SND_SOC_DAIFMT_FORMAT_MASK)
	== SND_SOC_DAIFMT_RIGHT_J))
	return -EINVAL;

	index = cs4265_get_clk_index(cs4265->sysclk, params_rate(params));
	if (index >= 0) {
	snd_soc_component_update_bits(component, CS4265_ADC_CTL,
	CS4265_ADC_FM, clk_map_table[index].fm_mode << 6);
	snd_soc_component_update_bits(component, CS4265_MCLK_FREQ,
	CS4265_MCLK_FREQ_MASK,
	clk_map_table[index].mclkdiv << 4);

	} else {
	dev_err(component->dev, "can't get correct mclk\n");
	return -EINVAL;
	}

	switch (cs4265->format & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
	snd_soc_component_update_bits(component, CS4265_DAC_CTL,
	CS4265_DAC_CTL_DIF, (1 << 4));
	snd_soc_component_update_bits(component, CS4265_ADC_CTL,
	CS4265_ADC_DIF, (1 << 4));
	snd_soc_component_update_bits(component, CS4265_SPDIF_CTL2,
	CS4265_SPDIF_CTL2_DIF, (1 << 6));
	break;
	case SND_SOC_DAIFMT_RIGHT_J:
	if (params_width(params) == 16) {
	snd_soc_component_update_bits(component, CS4265_DAC_CTL,
	CS4265_DAC_CTL_DIF, (2 << 4));
	snd_soc_component_update_bits(component, CS4265_SPDIF_CTL2,
	CS4265_SPDIF_CTL2_DIF, (2 << 6));
	} else {
	snd_soc_component_update_bits(component, CS4265_DAC_CTL,
	CS4265_DAC_CTL_DIF, (3 << 4));
	snd_soc_component_update_bits(component, CS4265_SPDIF_CTL2,
	CS4265_SPDIF_CTL2_DIF, (3 << 6));
	}
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	snd_soc_component_update_bits(component, CS4265_DAC_CTL,
	CS4265_DAC_CTL_DIF, 0);
	snd_soc_component_update_bits(component, CS4265_ADC_CTL,
	CS4265_ADC_DIF, 0);
	snd_soc_component_update_bits(component, CS4265_SPDIF_CTL2,
	CS4265_SPDIF_CTL2_DIF, 0);

	break;
	default:
	return -EINVAL;
	}
	return 0;
	}

	static int cs4265_set_bias_level(struct snd_soc_component *component,
	enum snd_soc_bias_level level)
	{
	switch (level) {
	case SND_SOC_BIAS_ON:
	break;
	case SND_SOC_BIAS_PREPARE:
	snd_soc_component_update_bits(component, CS4265_PWRCTL,
	CS4265_PWRCTL_PDN, 0);
	break;
	case SND_SOC_BIAS_STANDBY:
	snd_soc_component_update_bits(component, CS4265_PWRCTL,
	CS4265_PWRCTL_PDN,
	CS4265_PWRCTL_PDN);
	break;
	case SND_SOC_BIAS_OFF:
	snd_soc_component_update_bits(component, CS4265_PWRCTL,
	CS4265_PWRCTL_PDN,
	CS4265_PWRCTL_PDN);
	break;
	}
	return 0;
	}

	#define CS4265_RATES (SNDRV_PCM_RATE_32000 \| SNDRV_PCM_RATE_44100 \| \
	SNDRV_PCM_RATE_48000 \| SNDRV_PCM_RATE_64000 \| \
	SNDRV_PCM_RATE_88200 \| SNDRV_PCM_RATE_96000 \| \
	SNDRV_PCM_RATE_176400 \| SNDRV_PCM_RATE_192000)

	#define CS4265_FORMATS (SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_U16_LE \| \
	SNDRV_PCM_FMTBIT_S24_LE \| SNDRV_PCM_FMTBIT_U24_LE)

	static const struct snd_soc_dai_ops cs4265_ops = {
	.hw_params = cs4265_pcm_hw_params,
	.digital_mute = cs4265_digital_mute,
	.set_fmt = cs4265_set_fmt,
	.set_sysclk = cs4265_set_sysclk,
	};

	static struct snd_soc_dai_driver cs4265_dai[] = {
	{
	.name = "cs4265-dai1",
	.playback = {
	.stream_name = "DAI1 Playback",
	.channels_min = 1,
	.channels_max = 2,
	.rates = CS4265_RATES,
	.formats = CS4265_FORMATS,
	},
	.capture = {
	.stream_name = "DAI1 Capture",
	.channels_min = 1,
	.channels_max = 2,
	.rates = CS4265_RATES,
	.formats = CS4265_FORMATS,
	},
	.ops = &cs4265_ops,
	},
	{
	.name = "cs4265-dai2",
	.playback = {
	.stream_name = "DAI2 Playback",
	.channels_min = 1,
	.channels_max = 2,
	.rates = CS4265_RATES,
	.formats = CS4265_FORMATS,
	},
	.capture = {
	.stream_name = "DAI2 Capture",
	.channels_min = 1,
	.channels_max = 2,
	.rates = CS4265_RATES,
	.formats = CS4265_FORMATS,
	},
	.ops = &cs4265_ops,
	},
	};

	static const struct snd_soc_component_driver soc_component_cs4265 = {
	.set_bias_level = cs4265_set_bias_level,
	.controls = cs4265_snd_controls,
	.num_controls = ARRAY_SIZE(cs4265_snd_controls),
	.dapm_widgets = cs4265_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(cs4265_dapm_widgets),
	.dapm_routes = cs4265_audio_map,
	.num_dapm_routes = ARRAY_SIZE(cs4265_audio_map),
	.idle_bias_on = 1,
	.use_pmdown_time = 1,
	.endianness = 1,
	.non_legacy_dai_naming = 1,
	};

	static const struct regmap_config cs4265_regmap = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = CS4265_MAX_REGISTER,
	.reg_defaults = cs4265_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(cs4265_reg_defaults),
	.readable_reg = cs4265_readable_register,
	.volatile_reg = cs4265_volatile_register,
	.cache_type = REGCACHE_RBTREE,
	};

	static int cs4265_i2c_probe(struct i2c_client *i2c_client,
	const struct i2c_device_id *id)
	{
	struct cs4265_private *cs4265;
	int ret = 0;
	unsigned int devid = 0;
	unsigned int reg;

	cs4265 = devm_kzalloc(&i2c_client->dev, sizeof(struct cs4265_private),
	GFP_KERNEL);
	if (cs4265 == NULL)
	return -ENOMEM;

	cs4265->regmap = devm_regmap_init_i2c(i2c_client, &cs4265_regmap);
	if (IS_ERR(cs4265->regmap)) {
	ret = PTR_ERR(cs4265->regmap);
	dev_err(&i2c_client->dev, "regmap_init() failed: %d\n", ret);
	return ret;
	}

	cs4265->reset_gpio = devm_gpiod_get_optional(&i2c_client->dev,
	"reset", GPIOD_OUT_LOW);
	if (IS_ERR(cs4265->reset_gpio))
	return PTR_ERR(cs4265->reset_gpio);

	if (cs4265->reset_gpio) {
	mdelay(1);
	gpiod_set_value_cansleep(cs4265->reset_gpio, 1);
	}

	i2c_set_clientdata(i2c_client, cs4265);

	ret = regmap_read(cs4265->regmap, CS4265_CHIP_ID, &reg);
	devid = reg & CS4265_CHIP_ID_MASK;
	if (devid != CS4265_CHIP_ID_VAL) {
	ret = -ENODEV;
	dev_err(&i2c_client->dev,
	"CS4265 Device ID (%X). Expected %X\n",
	devid, CS4265_CHIP_ID);
	return ret;
	}
	dev_info(&i2c_client->dev,
	"CS4265 Version %x\n",
	reg & CS4265_REV_ID_MASK);

	regmap_write(cs4265->regmap, CS4265_PWRCTL, 0x0F);

	ret = devm_snd_soc_register_component(&i2c_client->dev,
	&soc_component_cs4265, cs4265_dai,
	ARRAY_SIZE(cs4265_dai));
	return ret;
	}

	static const struct of_device_id cs4265_of_match[] = {
	{ .compatible = "cirrus,cs4265", },
	{ }
	};
	MODULE_DEVICE_TABLE(of, cs4265_of_match);

	static const struct i2c_device_id cs4265_id[] = {
	{ "cs4265", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, cs4265_id);

	static struct i2c_driver cs4265_i2c_driver = {
	.driver = {
	.name = "cs4265",
	.of_match_table = cs4265_of_match,
	},
	.id_table = cs4265_id,
	.probe = cs4265_i2c_probe,
	};

	module_i2c_driver(cs4265_i2c_driver);

	MODULE_DESCRIPTION("ASoC CS4265 driver");
	MODULE_AUTHOR("Paul Handrigan, Cirrus Logic Inc, <paul.handrigan@cirrus.com>");
	MODULE_LICENSE("GPL");