ASoC: Add max98926 codec driver (a2e2876a) · Commits · e / devices / android_kernel_fairphone_FP3

Documentation/devicetree/bindings/sound/max98926.txt

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		max98926 audio CODEC

		This device supports I2C.

		Required properties:

		- compatible : "maxim,max98926"

		- vmon-slot-no : slot number used to send voltage information
		or in inteleave mode this will be used as
		interleave slot.

		- imon-slot-no : slot number used to send current information

		- interleave-mode : When using two MAX98926 in a system it is
		possible to create ADC data that that will
		overflow the frame size. Digital Audio Interleave
		mode provides a means to output VMON and IMON data
		from two devices on a single DOUT line when running
		smaller frames sizes such as 32 BCLKS per LRCLK or
		48 BCLKS per LRCLK.

		- reg : the I2C address of the device for I2C

		Example:

		codec: max98926@1a {
		compatible = "maxim,max98926";
		vmon-slot-no = <0>;
		imon-slot-no = <2>;
		reg = <0x1a>;
		};

sound/soc/codecs/Kconfig

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		@@ -80,6 +80,7 @@ config SND_SOC_ALL_CODECS
		select SND_SOC_MAX98095 if I2C
		select SND_SOC_MAX98357A if GPIOLIB
		select SND_SOC_MAX98925 if I2C
		select SND_SOC_MAX98926 if I2C
		select SND_SOC_MAX9850 if I2C
		select SND_SOC_MAX9768 if I2C
		select SND_SOC_MAX9877 if I2C
		@@ -519,6 +520,9 @@ config SND_SOC_MAX98357A
		config SND_SOC_MAX98925
		tristate

		config SND_SOC_MAX98926
		tristate

		config SND_SOC_MAX9850
		tristate

sound/soc/codecs/Makefile

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		@@ -75,6 +75,7 @@ snd-soc-max98090-objs := max98090.o
		snd-soc-max98095-objs := max98095.o
		snd-soc-max98357a-objs := max98357a.o
		snd-soc-max98925-objs := max98925.o
		snd-soc-max98926-objs := max98926.o
		snd-soc-max9850-objs := max9850.o
		snd-soc-mc13783-objs := mc13783.o
		snd-soc-ml26124-objs := ml26124.o
		@@ -279,6 +280,7 @@ obj-$(CONFIG_SND_SOC_MAX98090) += snd-soc-max98090.o
		obj-$(CONFIG_SND_SOC_MAX98095) += snd-soc-max98095.o
		obj-$(CONFIG_SND_SOC_MAX98357A) += snd-soc-max98357a.o
		obj-$(CONFIG_SND_SOC_MAX98925) += snd-soc-max98925.o
		obj-$(CONFIG_SND_SOC_MAX98926) += snd-soc-max98926.o
		obj-$(CONFIG_SND_SOC_MAX9850) += snd-soc-max9850.o
		obj-$(CONFIG_SND_SOC_MC13783) += snd-soc-mc13783.o
		obj-$(CONFIG_SND_SOC_ML26124) += snd-soc-ml26124.o

sound/soc/codecs/max98926.c

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		/*
		* max98926.c -- ALSA SoC MAX98926 driver
		* Copyright 2013-15 Maxim Integrated Products
		* 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/delay.h>
		#include <linux/i2c.h>
		#include <linux/module.h>
		#include <linux/regmap.h>
		#include <linux/slab.h>
		#include <linux/cdev.h>
		#include <sound/pcm.h>
		#include <sound/pcm_params.h>
		#include <sound/soc.h>
		#include <sound/tlv.h>
		#include "max98926.h"

		static const char * const max98926_boost_voltage_txt[] = {
		"8.5V", "8.25V", "8.0V", "7.75V", "7.5V", "7.25V", "7.0V", "6.75V",
		"6.5V", "6.5V", "6.5V", "6.5V", "6.5V", "6.5V", "6.5V", "6.5V"
		};

		static const char * const max98926_boost_current_txt[] = {
		"0.6", "0.8", "1.0", "1.2", "1.4", "1.6", "1.8", "2.0",
		"2.2", "2.4", "2.6", "2.8", "3.2", "3.6", "4.0", "4.4"
		};

		static const char *const max98926_dai_txt[] = {
		"Left", "Right", "LeftRight", "LeftRightDiv2",
		};

		static const char *const max98926_pdm_ch_text[] = {
		"Current", "Voltage",
		};

		static const char *const max98926_hpf_cutoff_txt[] = {
		"Disable", "DC Block", "100Hz",
		"200Hz", "400Hz", "800Hz",
		};

		static struct reg_default max98926_reg[] = {
		{ 0x0B, 0x00 }, /* IRQ Enable0 */
		{ 0x0C, 0x00 }, /* IRQ Enable1 */
		{ 0x0D, 0x00 }, /* IRQ Enable2 */
		{ 0x0E, 0x00 }, /* IRQ Clear0 */
		{ 0x0F, 0x00 }, /* IRQ Clear1 */
		{ 0x10, 0x00 }, /* IRQ Clear2 */
		{ 0x11, 0xC0 }, /* Map0 */
		{ 0x12, 0x00 }, /* Map1 */
		{ 0x13, 0x00 }, /* Map2 */
		{ 0x14, 0xF0 }, /* Map3 */
		{ 0x15, 0x00 }, /* Map4 */
		{ 0x16, 0xAB }, /* Map5 */
		{ 0x17, 0x89 }, /* Map6 */
		{ 0x18, 0x00 }, /* Map7 */
		{ 0x19, 0x00 }, /* Map8 */
		{ 0x1A, 0x04 }, /* DAI Clock Mode 1 */
		{ 0x1B, 0x00 }, /* DAI Clock Mode 2 */
		{ 0x1C, 0x00 }, /* DAI Clock Divider Denominator MSBs */
		{ 0x1D, 0x00 }, /* DAI Clock Divider Denominator LSBs */
		{ 0x1E, 0xF0 }, /* DAI Clock Divider Numerator MSBs */
		{ 0x1F, 0x00 }, /* DAI Clock Divider Numerator LSBs */
		{ 0x20, 0x50 }, /* Format */
		{ 0x21, 0x00 }, /* TDM Slot Select */
		{ 0x22, 0x00 }, /* DOUT Configuration VMON */
		{ 0x23, 0x00 }, /* DOUT Configuration IMON */
		{ 0x24, 0x00 }, /* DOUT Configuration VBAT */
		{ 0x25, 0x00 }, /* DOUT Configuration VBST */
		{ 0x26, 0x00 }, /* DOUT Configuration FLAG */
		{ 0x27, 0xFF }, /* DOUT HiZ Configuration 1 */
		{ 0x28, 0xFF }, /* DOUT HiZ Configuration 2 */
		{ 0x29, 0xFF }, /* DOUT HiZ Configuration 3 */
		{ 0x2A, 0xFF }, /* DOUT HiZ Configuration 4 */
		{ 0x2B, 0x02 }, /* DOUT Drive Strength */
		{ 0x2C, 0x90 }, /* Filters */
		{ 0x2D, 0x00 }, /* Gain */
		{ 0x2E, 0x02 }, /* Gain Ramping */
		{ 0x2F, 0x00 }, /* Speaker Amplifier */
		{ 0x30, 0x0A }, /* Threshold */
		{ 0x31, 0x00 }, /* ALC Attack */
		{ 0x32, 0x80 }, /* ALC Atten and Release */
		{ 0x33, 0x00 }, /* ALC Infinite Hold Release */
		{ 0x34, 0x92 }, /* ALC Configuration */
		{ 0x35, 0x01 }, /* Boost Converter */
		{ 0x36, 0x00 }, /* Block Enable */
		{ 0x37, 0x00 }, /* Configuration */
		{ 0x38, 0x00 }, /* Global Enable */
		{ 0x3A, 0x00 }, /* Boost Limiter */
		};

		static const struct soc_enum max98926_voltage_enum[] = {
		SOC_ENUM_SINGLE(MAX98926_DAI_CLK_DIV_N_LSBS, 0,
		ARRAY_SIZE(max98926_pdm_ch_text),
		max98926_pdm_ch_text),
		};

		static const struct snd_kcontrol_new max98926_voltage_control =
		SOC_DAPM_ENUM("Route", max98926_voltage_enum);

		static const struct soc_enum max98926_current_enum[] = {
		SOC_ENUM_SINGLE(MAX98926_DAI_CLK_DIV_N_LSBS,
		MAX98926_PDM_SOURCE_1_SHIFT,
		ARRAY_SIZE(max98926_pdm_ch_text),
		max98926_pdm_ch_text),
		};

		static const struct snd_kcontrol_new max98926_current_control =
		SOC_DAPM_ENUM("Route", max98926_current_enum);

		static const struct snd_kcontrol_new max98926_mixer_controls[] = {
		SOC_DAPM_SINGLE("PCM Single Switch", MAX98926_SPK_AMP,
		MAX98926_INSELECT_MODE_SHIFT, 0, 0),
		SOC_DAPM_SINGLE("PDM Single Switch", MAX98926_SPK_AMP,
		MAX98926_INSELECT_MODE_SHIFT, 1, 0),
		};

		static const struct snd_kcontrol_new max98926_dai_controls[] = {
		SOC_DAPM_SINGLE("Left", MAX98926_GAIN,
		MAX98926_DAC_IN_SEL_SHIFT, 0, 0),
		SOC_DAPM_SINGLE("Right", MAX98926_GAIN,
		MAX98926_DAC_IN_SEL_SHIFT, 1, 0),
		SOC_DAPM_SINGLE("LeftRight", MAX98926_GAIN,
		MAX98926_DAC_IN_SEL_SHIFT, 2, 0),
		SOC_DAPM_SINGLE("(Left+Right)/2 Switch", MAX98926_GAIN,
		MAX98926_DAC_IN_SEL_SHIFT, 3, 0),
		};

		static const struct snd_soc_dapm_widget max98926_dapm_widgets[] = {
		SND_SOC_DAPM_AIF_IN("DAI_OUT", "HiFi Playback", 0,
		SND_SOC_NOPM, 0, 0),
		SND_SOC_DAPM_DAC("Amp Enable", NULL, MAX98926_BLOCK_ENABLE,
		MAX98926_SPK_EN_SHIFT, 0),
		SND_SOC_DAPM_SUPPLY("Global Enable", MAX98926_GLOBAL_ENABLE,
		MAX98926_EN_SHIFT, 0, NULL, 0),
		SND_SOC_DAPM_SUPPLY("VI Enable", MAX98926_BLOCK_ENABLE,
		MAX98926_ADC_IMON_EN_WIDTH \|
		MAX98926_ADC_VMON_EN_SHIFT,
		0, NULL, 0),
		SND_SOC_DAPM_PGA("BST Enable", MAX98926_BLOCK_ENABLE,
		MAX98926_BST_EN_SHIFT, 0, NULL, 0),
		SND_SOC_DAPM_OUTPUT("BE_OUT"),
		SND_SOC_DAPM_MIXER("PCM Sel", MAX98926_SPK_AMP,
		MAX98926_INSELECT_MODE_SHIFT, 0,
		&max98926_mixer_controls[0],
		ARRAY_SIZE(max98926_mixer_controls)),
		SND_SOC_DAPM_MIXER("DAI Sel",
		MAX98926_GAIN, MAX98926_DAC_IN_SEL_SHIFT, 0,
		&max98926_dai_controls[0],
		ARRAY_SIZE(max98926_dai_controls)),
		SND_SOC_DAPM_MUX("PDM CH1 Source",
		MAX98926_DAI_CLK_DIV_N_LSBS,
		MAX98926_PDM_CURRENT_SHIFT,
		0, &max98926_current_control),
		SND_SOC_DAPM_MUX("PDM CH0 Source",
		MAX98926_DAI_CLK_DIV_N_LSBS,
		MAX98926_PDM_VOLTAGE_SHIFT,
		0, &max98926_voltage_control),
		};

		static const struct snd_soc_dapm_route max98926_audio_map[] = {
		{"VI Enable", NULL, "DAI_OUT"},
		{"DAI Sel", "Left", "VI Enable"},
		{"DAI Sel", "Right", "VI Enable"},
		{"DAI Sel", "LeftRight", "VI Enable"},
		{"DAI Sel", "LeftRightDiv2", "VI Enable"},
		{"PCM Sel", "PCM", "DAI Sel"},

		{"PDM CH1 Source", "Current", "DAI_OUT"},
		{"PDM CH1 Source", "Voltage", "DAI_OUT"},
		{"PDM CH0 Source", "Current", "DAI_OUT"},
		{"PDM CH0 Source", "Voltage", "DAI_OUT"},
		{"PCM Sel", "Analog", "PDM CH1 Source"},
		{"PCM Sel", "Analog", "PDM CH0 Source"},
		{"Amp Enable", NULL, "PCM Sel"},

		{"BST Enable", NULL, "Amp Enable"},
		{"BE_OUT", NULL, "BST Enable"},
		};

		static bool max98926_volatile_register(struct device *dev, unsigned int reg)
		{
		switch (reg) {
		case MAX98926_VBAT_DATA:
		case MAX98926_VBST_DATA:
		case MAX98926_LIVE_STATUS0:
		case MAX98926_LIVE_STATUS1:
		case MAX98926_LIVE_STATUS2:
		case MAX98926_STATE0:
		case MAX98926_STATE1:
		case MAX98926_STATE2:
		case MAX98926_FLAG0:
		case MAX98926_FLAG1:
		case MAX98926_FLAG2:
		case MAX98926_VERSION:
		return true;
		default:
		return false;
		}
		}

		static bool max98926_readable_register(struct device *dev, unsigned int reg)
		{
		switch (reg) {
		case MAX98926_IRQ_CLEAR0:
		case MAX98926_IRQ_CLEAR1:
		case MAX98926_IRQ_CLEAR2:
		case MAX98926_ALC_HOLD_RLS:
		return false;
		default:
		return true;
		}
		};

		DECLARE_TLV_DB_SCALE(max98926_spk_tlv, -600, 100, 0);
		DECLARE_TLV_DB_RANGE(max98926_current_tlv,
		0, 11, TLV_DB_SCALE_ITEM(20, 20, 0),
		12, 15, TLV_DB_SCALE_ITEM(320, 40, 0),
		);

		static SOC_ENUM_SINGLE_DECL(max98926_dac_hpf_cutoff,
		MAX98926_FILTERS, MAX98926_DAC_HPF_SHIFT,
		max98926_hpf_cutoff_txt);

		static SOC_ENUM_SINGLE_DECL(max98926_boost_voltage,
		MAX98926_CONFIGURATION, MAX98926_BST_VOUT_SHIFT,
		max98926_boost_voltage_txt);

		static const struct snd_kcontrol_new max98926_snd_controls[] = {
		SOC_SINGLE_TLV("Speaker Volume", MAX98926_GAIN,
		MAX98926_SPK_GAIN_SHIFT,
		(1<<MAX98926_SPK_GAIN_WIDTH)-1, 0,
		max98926_spk_tlv),
		SOC_SINGLE("Ramp Switch", MAX98926_GAIN_RAMPING,
		MAX98926_SPK_RMP_EN_SHIFT, 1, 0),
		SOC_SINGLE("ZCD Switch", MAX98926_GAIN_RAMPING,
		MAX98926_SPK_ZCD_EN_SHIFT, 1, 0),
		SOC_SINGLE("ALC Switch", MAX98926_THRESHOLD,
		MAX98926_ALC_EN_SHIFT, 1, 0),
		SOC_SINGLE("ALC Threshold", MAX98926_THRESHOLD,
		MAX98926_ALC_TH_SHIFT,
		(1<<MAX98926_ALC_TH_WIDTH)-1, 0),
		SOC_ENUM("Boost Output Voltage", max98926_boost_voltage),
		SOC_SINGLE_TLV("Boost Current Limit", MAX98926_BOOST_LIMITER,
		MAX98926_BST_ILIM_SHIFT,
		(1<<MAX98926_BST_ILIM_SHIFT)-1, 0,
		max98926_current_tlv),
		SOC_ENUM("DAC HPF Cutoff", max98926_dac_hpf_cutoff),
		SOC_DOUBLE("PDM Channel One", MAX98926_DAI_CLK_DIV_N_LSBS,
		MAX98926_PDM_CHANNEL_1_SHIFT,
		MAX98926_PDM_CHANNEL_1_HIZ, 1, 0),
		SOC_DOUBLE("PDM Channel Zero", MAX98926_DAI_CLK_DIV_N_LSBS,
		MAX98926_PDM_CHANNEL_0_SHIFT,
		MAX98926_PDM_CHANNEL_0_HIZ, 1, 0),
		};

		static const struct {
		int rate;
		int sr;
		} rate_table[] = {
		{
		.rate = 8000,
		.sr = 0,
		},
		{
		.rate = 11025,
		.sr = 1,
		},
		{
		.rate = 12000,
		.sr = 2,
		},
		{
		.rate = 16000,
		.sr = 3,
		},
		{
		.rate = 22050,
		.sr = 4,
		},
		{
		.rate = 24000,
		.sr = 5,
		},
		{
		.rate = 32000,
		.sr = 6,
		},
		{
		.rate = 44100,
		.sr = 7,
		},
		{
		.rate = 48000,
		.sr = 8,
		},
		};

		static void max98926_set_sense_data(struct max98926_priv *max98926)
		{
		regmap_update_bits(max98926->regmap,
		MAX98926_DOUT_CFG_VMON,
		MAX98926_DAI_VMON_EN_MASK,
		MAX98926_DAI_VMON_EN_MASK);
		regmap_update_bits(max98926->regmap,
		MAX98926_DOUT_CFG_IMON,
		MAX98926_DAI_IMON_EN_MASK,
		MAX98926_DAI_IMON_EN_MASK);

		if (!max98926->interleave_mode) {
		/* set VMON slots */
		regmap_update_bits(max98926->regmap,
		MAX98926_DOUT_CFG_VMON,
		MAX98926_DAI_VMON_SLOT_MASK,
		max98926->v_slot);
		/* set IMON slots */
		regmap_update_bits(max98926->regmap,
		MAX98926_DOUT_CFG_IMON,
		MAX98926_DAI_IMON_SLOT_MASK,
		max98926->i_slot);
		} else {
		/* enable interleave mode */
		regmap_update_bits(max98926->regmap,
		MAX98926_FORMAT,
		MAX98926_DAI_INTERLEAVE_MASK,
		MAX98926_DAI_INTERLEAVE_MASK);
		/* set interleave slots */
		regmap_update_bits(max98926->regmap,
		MAX98926_DOUT_CFG_VBAT,
		MAX98926_DAI_INTERLEAVE_SLOT_MASK,
		max98926->v_slot);
		}
		}

		static int max98926_dai_set_fmt(struct snd_soc_dai *codec_dai,
		unsigned int fmt)
		{
		struct snd_soc_codec *codec = codec_dai->codec;
		struct max98926_priv *max98926 = snd_soc_codec_get_drvdata(codec);
		unsigned int invert = 0;

		dev_dbg(codec->dev, "%s: fmt 0x%08X\n", __func__, fmt);

		switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
		case SND_SOC_DAIFMT_CBS_CFS:
		max98926_set_sense_data(max98926);
		break;
		default:
		dev_err(codec->dev, "DAI clock mode unsupported");
		return -EINVAL;
		}

		switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
		case SND_SOC_DAIFMT_NB_NF:
		break;
		case SND_SOC_DAIFMT_NB_IF:
		invert = MAX98926_DAI_WCI_MASK;
		break;
		case SND_SOC_DAIFMT_IB_NF:
		invert = MAX98926_DAI_BCI_MASK;
		break;
		case SND_SOC_DAIFMT_IB_IF:
		invert = MAX98926_DAI_BCI_MASK \| MAX98926_DAI_WCI_MASK;
		break;
		default:
		dev_err(codec->dev, "DAI invert mode unsupported");
		return -EINVAL;
		}

		regmap_write(max98926->regmap,
		MAX98926_FORMAT, MAX98926_DAI_DLY_MASK);
		regmap_update_bits(max98926->regmap, MAX98926_FORMAT,
		MAX98926_DAI_BCI_MASK, invert);
		return 0;
		}

		static int max98926_dai_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params,
		struct snd_soc_dai *dai)
		{
		int dai_sr = -EINVAL;
		int rate = params_rate(params), i;
		struct snd_soc_codec *codec = dai->codec;
		struct max98926_priv *max98926 = snd_soc_codec_get_drvdata(codec);
		/* BCLK/LRCLK ratio calculation */
		int blr_clk_ratio = params_channels(params) * max98926->ch_size;

		switch (params_format(params)) {
		case SNDRV_PCM_FORMAT_S16_LE:
		regmap_update_bits(max98926->regmap,
		MAX98926_FORMAT,
		MAX98926_DAI_CHANSZ_MASK,
		MAX98926_DAI_CHANSZ_16);
		max98926->ch_size = 16;
		break;
		case SNDRV_PCM_FORMAT_S24_LE:
		regmap_update_bits(max98926->regmap,
		MAX98926_FORMAT,
		MAX98926_DAI_CHANSZ_MASK,
		MAX98926_DAI_CHANSZ_24);
		max98926->ch_size = 24;
		break;
		case SNDRV_PCM_FORMAT_S32_LE:
		regmap_update_bits(max98926->regmap,
		MAX98926_FORMAT,
		MAX98926_DAI_CHANSZ_MASK,
		MAX98926_DAI_CHANSZ_32);
		max98926->ch_size = 32;
		break;
		default:
		dev_dbg(codec->dev, "format unsupported %d",
		params_format(params));
		return -EINVAL;
		}

		switch (blr_clk_ratio) {
		case 32:
		regmap_update_bits(max98926->regmap,
		MAX98926_DAI_CLK_MODE2,
		MAX98926_DAI_BSEL_MASK,
		MAX98926_DAI_BSEL_32);
		break;
		case 48:
		regmap_update_bits(max98926->regmap,
		MAX98926_DAI_CLK_MODE2,
		MAX98926_DAI_BSEL_MASK,
		MAX98926_DAI_BSEL_48);
		break;
		case 64:
		regmap_update_bits(max98926->regmap,
		MAX98926_DAI_CLK_MODE2,
		MAX98926_DAI_BSEL_MASK,
		MAX98926_DAI_BSEL_64);
		break;
		default:
		return -EINVAL;
		}

		/* find the closest rate */
		for (i = 0; i < ARRAY_SIZE(rate_table); i++) {
		if (rate_table[i].rate >= rate) {
		dai_sr = rate_table[i].sr;
		break;
		}
		}
		if (dai_sr < 0)
		return -EINVAL;

		/* set DAI_SR to correct LRCLK frequency */
		regmap_update_bits(max98926->regmap,
		MAX98926_DAI_CLK_MODE2,
		MAX98926_DAI_SR_MASK, dai_sr << MAX98926_DAI_SR_SHIFT);
		return 0;
		}

		#define MAX98926_FORMATS (SNDRV_PCM_FMTBIT_S16_LE \| \
		SNDRV_PCM_FMTBIT_S24_LE \| SNDRV_PCM_FMTBIT_S32_LE)

		static struct snd_soc_dai_ops max98926_dai_ops = {
		.set_fmt = max98926_dai_set_fmt,
		.hw_params = max98926_dai_hw_params,
		};

		static struct snd_soc_dai_driver max98926_dai[] = {
		{
		.name = "max98926-aif1",
		.playback = {
		.stream_name = "HiFi Playback",
		.channels_min = 1,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_8000_48000,
		.formats = MAX98926_FORMATS,
		},
		.capture = {
		.stream_name = "HiFi Capture",
		.channels_min = 1,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_8000_48000,
		.formats = MAX98926_FORMATS,
		},
		.ops = &max98926_dai_ops,
		}
		};

		static int max98926_probe(struct snd_soc_codec *codec)
		{
		struct max98926_priv *max98926 = snd_soc_codec_get_drvdata(codec);

		max98926->codec = codec;
		codec->control_data = max98926->regmap;
		/* Hi-Z all the slots */
		regmap_write(max98926->regmap, MAX98926_DOUT_HIZ_CFG4, 0xF0);
		return 0;
		}

		static struct snd_soc_codec_driver soc_codec_dev_max98926 = {
		.probe = max98926_probe,
		.controls = max98926_snd_controls,
		.num_controls = ARRAY_SIZE(max98926_snd_controls),
		.dapm_routes = max98926_audio_map,
		.num_dapm_routes = ARRAY_SIZE(max98926_audio_map),
		.dapm_widgets = max98926_dapm_widgets,
		.num_dapm_widgets = ARRAY_SIZE(max98926_dapm_widgets),
		};

		static struct regmap_config max98926_regmap = {
		.reg_bits = 8,
		.val_bits = 8,
		.max_register = MAX98926_VERSION,
		.reg_defaults = max98926_reg,
		.num_reg_defaults = ARRAY_SIZE(max98926_reg),
		.volatile_reg = max98926_volatile_register,
		.readable_reg = max98926_readable_register,
		.cache_type = REGCACHE_RBTREE,
		};

		static int max98926_i2c_probe(struct i2c_client *i2c,
		const struct i2c_device_id *id)
		{
		int ret, reg;
		u32 value;
		struct max98926_priv *max98926;

		max98926 = devm_kzalloc(&i2c->dev,
		sizeof(*max98926), GFP_KERNEL);
		if (!max98926)
		return -ENOMEM;

		i2c_set_clientdata(i2c, max98926);
		max98926->regmap = devm_regmap_init_i2c(i2c, &max98926_regmap);
		if (IS_ERR(max98926->regmap)) {
		ret = PTR_ERR(max98926->regmap);
		dev_err(&i2c->dev,
		"Failed to allocate regmap: %d\n", ret);
		goto err_out;
		}
		if (of_property_read_bool(i2c->dev.of_node, "interleave-mode"))
		max98926->interleave_mode = true;

		if (!of_property_read_u32(i2c->dev.of_node, "vmon-slot-no", &value)) {
		if (value > MAX98926_DAI_VMON_SLOT_1E_1F) {
		dev_err(&i2c->dev, "vmon slot number is wrong:\n");
		return -EINVAL;
		}
		max98926->v_slot = value;
		}
		if (!of_property_read_u32(i2c->dev.of_node, "imon-slot-no", &value)) {
		if (value > MAX98926_DAI_IMON_SLOT_1E_1F) {
		dev_err(&i2c->dev, "imon slot number is wrong:\n");
		return -EINVAL;
		}
		max98926->i_slot = value;
		}
		ret = regmap_read(max98926->regmap,
		MAX98926_VERSION, &reg);
		if (ret < 0) {
		dev_err(&i2c->dev, "Failed to read: %x\n", reg);
		return ret;
		}

		ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_max98926,
		max98926_dai, ARRAY_SIZE(max98926_dai));
		if (ret < 0)
		dev_err(&i2c->dev,
		"Failed to register codec: %d\n", ret);
		dev_info(&i2c->dev, "device version: %x\n", reg);
		err_out:
		return ret;
		}

		static int max98926_i2c_remove(struct i2c_client *client)
		{
		snd_soc_unregister_codec(&client->dev);
		return 0;
		}

		static const struct i2c_device_id max98926_i2c_id[] = {
		{ "max98926", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, max98926_i2c_id);

		static const struct of_device_id max98926_of_match[] = {
		{ .compatible = "maxim,max98926", },
		{ }
		};
		MODULE_DEVICE_TABLE(of, max98926_of_match);

		static struct i2c_driver max98926_i2c_driver = {
		.driver = {
		.name = "max98926",
		.of_match_table = of_match_ptr(max98926_of_match),
		.pm = NULL,
		},
		.probe = max98926_i2c_probe,
		.remove = max98926_i2c_remove,
		.id_table = max98926_i2c_id,
		};

		module_i2c_driver(max98926_i2c_driver)
		MODULE_DESCRIPTION("ALSA SoC MAX98926 driver");
		MODULE_AUTHOR("Anish kumar <anish.kumar@maximintegrated.com>");
		MODULE_LICENSE("GPL");

sound/soc/codecs/max98926.h

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