sound/soc/codecs/max98925.c - kernel/msm-4.19 - Gitiles

 /*
  * max98925.c -- ALSA SoC Stereo MAX98925 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 "max98925.h"

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

 static const char * const max98925_boost_voltage_text[] = {
 	"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 SOC_ENUM_SINGLE_DECL(max98925_boost_voltage,
 	MAX98925_CONFIGURATION, M98925_BST_VOUT_SHIFT,
 	max98925_boost_voltage_text);

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

 static const struct reg_default max98925_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, 0x06 }, /* DAI Clock Mode 1 */
 	{ 0x1B, 0xC0 }, /* 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 max98925_dai_enum =
 	SOC_ENUM_SINGLE(MAX98925_GAIN, 5, ARRAY_SIZE(dai_text), dai_text);

 static const struct soc_enum max98925_hpf_enum =
 	SOC_ENUM_SINGLE(MAX98925_FILTERS, 0, ARRAY_SIZE(hpf_text), hpf_text);

 static const struct snd_kcontrol_new max98925_hpf_sel_mux =
 	SOC_DAPM_ENUM("Rc Filter MUX Mux", max98925_hpf_enum);

 static const struct snd_kcontrol_new max98925_dai_sel_mux =
 	SOC_DAPM_ENUM("DAI IN MUX Mux", max98925_dai_enum);

 static int max98925_dac_event(struct snd_soc_dapm_widget *w,
 		struct snd_kcontrol *kcontrol, int event)
 {
 	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
 	struct max98925_priv *max98925 = snd_soc_codec_get_drvdata(codec);

 	switch (event) {
 	case SND_SOC_DAPM_PRE_PMU:
 		regmap_update_bits(max98925->regmap,
 			MAX98925_BLOCK_ENABLE,
 			M98925_BST_EN_MASK |
 			M98925_ADC_IMON_EN_MASK | M98925_ADC_VMON_EN_MASK,
 			M98925_BST_EN_MASK |
 			M98925_ADC_IMON_EN_MASK | M98925_ADC_VMON_EN_MASK);
 		break;
 	case SND_SOC_DAPM_POST_PMD:
 		regmap_update_bits(max98925->regmap,
 			MAX98925_BLOCK_ENABLE, M98925_BST_EN_MASK |
 			M98925_ADC_IMON_EN_MASK | M98925_ADC_VMON_EN_MASK, 0);
 		break;
 	default:
 		return 0;
 	}
 	return 0;
 }

 static const struct snd_soc_dapm_widget max98925_dapm_widgets[] = {
 	SND_SOC_DAPM_AIF_IN("DAI_OUT", "HiFi Playback", 0, SND_SOC_NOPM, 0, 0),
 	SND_SOC_DAPM_MUX("DAI IN MUX", SND_SOC_NOPM, 0, 0,
 				&max98925_dai_sel_mux),
 	SND_SOC_DAPM_MUX("Rc Filter MUX", SND_SOC_NOPM, 0, 0,
 				&max98925_hpf_sel_mux),
 	SND_SOC_DAPM_DAC_E("Amp Enable", NULL, MAX98925_BLOCK_ENABLE,
 			M98925_SPK_EN_SHIFT, 0, max98925_dac_event,
 			SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
 	SND_SOC_DAPM_SUPPLY("Global Enable", MAX98925_GLOBAL_ENABLE,
 			M98925_EN_SHIFT, 0, NULL, 0),
 	SND_SOC_DAPM_OUTPUT("BE_OUT"),
 };

 static const struct snd_soc_dapm_route max98925_audio_map[] = {
 	{"DAI IN MUX", "Left", "DAI_OUT"},
 	{"DAI IN MUX", "Right", "DAI_OUT"},
 	{"DAI IN MUX", "LeftRight", "DAI_OUT"},
 	{"DAI IN MUX", "LeftRightDiv2", "DAI_OUT"},
 	{"Rc Filter MUX", "Disable", "DAI IN MUX"},
 	{"Rc Filter MUX", "DC Block", "DAI IN MUX"},
 	{"Rc Filter MUX", "100Hz", "DAI IN MUX"},
 	{"Rc Filter MUX", "200Hz", "DAI IN MUX"},
 	{"Rc Filter MUX", "400Hz", "DAI IN MUX"},
 	{"Rc Filter MUX", "800Hz", "DAI IN MUX"},
 	{"Amp Enable", NULL, "Rc Filter MUX"},
 	{"BE_OUT", NULL, "Amp Enable"},
 	{"BE_OUT", NULL, "Global Enable"},
 };

 static bool max98925_volatile_register(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case MAX98925_VBAT_DATA:
 	case MAX98925_VBST_DATA:
 	case MAX98925_LIVE_STATUS0:
 	case MAX98925_LIVE_STATUS1:
 	case MAX98925_LIVE_STATUS2:
 	case MAX98925_STATE0:
 	case MAX98925_STATE1:
 	case MAX98925_STATE2:
 	case MAX98925_FLAG0:
 	case MAX98925_FLAG1:
 	case MAX98925_FLAG2:
 	case MAX98925_REV_VERSION:
 		return true;
 	default:
 		return false;
 	}
 }

 static bool max98925_readable_register(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case MAX98925_IRQ_CLEAR0:
 	case MAX98925_IRQ_CLEAR1:
 	case MAX98925_IRQ_CLEAR2:
 	case MAX98925_ALC_HOLD_RLS:
 		return false;
 	default:
 		return true;
 	}
 }

 static DECLARE_TLV_DB_SCALE(max98925_spk_tlv, -600, 100, 0);

 static const struct snd_kcontrol_new max98925_snd_controls[] = {
 	SOC_SINGLE_TLV("Speaker Volume", MAX98925_GAIN,
 		M98925_SPK_GAIN_SHIFT, (1<<M98925_SPK_GAIN_WIDTH)-1, 0,
 		max98925_spk_tlv),
 	SOC_SINGLE("Ramp Switch", MAX98925_GAIN_RAMPING,
 				M98925_SPK_RMP_EN_SHIFT, 1, 0),
 	SOC_SINGLE("ZCD Switch", MAX98925_GAIN_RAMPING,
 				M98925_SPK_ZCD_EN_SHIFT, 1, 0),
 	SOC_SINGLE("ALC Switch", MAX98925_THRESHOLD,
 				M98925_ALC_EN_SHIFT, 1, 0),
 	SOC_SINGLE("ALC Threshold", MAX98925_THRESHOLD, M98925_ALC_TH_SHIFT,
 				(1<<M98925_ALC_TH_WIDTH)-1, 0),
 	SOC_ENUM("Boost Output Voltage", max98925_boost_voltage),
 };

 /* codec sample rate and n/m dividers parameter table */
 static const struct {
 	int rate;
 	int  sr;
 	int divisors[3][2];
 } rate_table[] = {
 	{
 		.rate = 8000,
 		.sr = 0,
 		.divisors = { {1, 375}, {5, 1764}, {1, 384} }
 	},
 	{
 		.rate = 11025,
 		.sr = 1,
 		.divisors = { {147, 40000}, {1, 256}, {147, 40960} }
 	},
 	{
 		.rate = 12000,
 		.sr = 2,
 		.divisors = { {1, 250}, {5, 1176}, {1, 256} }
 	},
 	{
 		.rate = 16000,
 		.sr = 3,
 		.divisors = { {2, 375}, {5, 882}, {1, 192} }
 	},
 	{
 		.rate = 22050,
 		.sr = 4,
 		.divisors = { {147, 20000}, {1, 128}, {147, 20480} }
 	},
 	{
 		.rate = 24000,
 		.sr = 5,
 		.divisors = { {1, 125}, {5, 588}, {1, 128} }
 	},
 	{
 		.rate = 32000,
 		.sr = 6,
 		.divisors = { {4, 375}, {5, 441}, {1, 96} }
 	},
 	{
 		.rate = 44100,
 		.sr = 7,
 		.divisors = { {147, 10000}, {1, 64}, {147, 10240} }
 	},
 	{
 		.rate = 48000,
 		.sr = 8,
 		.divisors = { {2, 125}, {5, 294}, {1, 64} }
 	},
 };

 static inline int max98925_rate_value(struct snd_soc_codec *codec,
 		int rate, int clock, int *value, int *n, int *m)
 {
 	int ret = -EINVAL;
 	int i;

 	for (i = 0; i < ARRAY_SIZE(rate_table); i++) {
 		if (rate_table[i].rate >= rate) {
 			*value = rate_table[i].sr;
 			*n = rate_table[i].divisors[clock][0];
 			*m = rate_table[i].divisors[clock][1];
 			ret = 0;
 			break;
 		}
 	}
 	return ret;
 }

 static void max98925_set_sense_data(struct max98925_priv *max98925)
 {
 	/* set VMON slots */
 	regmap_update_bits(max98925->regmap,
 		MAX98925_DOUT_CFG_VMON,
 		M98925_DAI_VMON_EN_MASK, M98925_DAI_VMON_EN_MASK);
 	regmap_update_bits(max98925->regmap,
 		MAX98925_DOUT_CFG_VMON,
 		M98925_DAI_VMON_SLOT_MASK,
 		max98925->v_slot << M98925_DAI_VMON_SLOT_SHIFT);
 	/* set IMON slots */
 	regmap_update_bits(max98925->regmap,
 		MAX98925_DOUT_CFG_IMON,
 		M98925_DAI_IMON_EN_MASK, M98925_DAI_IMON_EN_MASK);
 	regmap_update_bits(max98925->regmap,
 		MAX98925_DOUT_CFG_IMON,
 		M98925_DAI_IMON_SLOT_MASK,
 		max98925->i_slot << M98925_DAI_IMON_SLOT_SHIFT);
 }

 static int max98925_dai_set_fmt(struct snd_soc_dai *codec_dai,
 				 unsigned int fmt)
 {
 	struct snd_soc_codec *codec = codec_dai->codec;
 	struct max98925_priv *max98925 = 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:
 		/* set DAI to slave mode */
 		regmap_update_bits(max98925->regmap,
 			MAX98925_DAI_CLK_MODE2,
 			M98925_DAI_MAS_MASK, 0);
 		max98925_set_sense_data(max98925);
 		break;
 	case SND_SOC_DAIFMT_CBM_CFM:
 		/*
 		 * set left channel DAI to master mode,
 		 * right channel always slave
 		 */
 		regmap_update_bits(max98925->regmap,
 			MAX98925_DAI_CLK_MODE2,
 			M98925_DAI_MAS_MASK, M98925_DAI_MAS_MASK);
 		break;
 	case SND_SOC_DAIFMT_CBS_CFM:
 	case SND_SOC_DAIFMT_CBM_CFS:
 	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 = M98925_DAI_WCI_MASK;
 		break;
 	case SND_SOC_DAIFMT_IB_NF:
 		invert = M98925_DAI_BCI_MASK;
 		break;
 	case SND_SOC_DAIFMT_IB_IF:
 		invert = M98925_DAI_BCI_MASK | M98925_DAI_WCI_MASK;
 		break;
 	default:
 		dev_err(codec->dev, "DAI invert mode unsupported");
 		return -EINVAL;
 	}

 	regmap_update_bits(max98925->regmap, MAX98925_FORMAT,
 			M98925_DAI_BCI_MASK | M98925_DAI_WCI_MASK, invert);
 	return 0;
 }

 static int max98925_set_clock(struct max98925_priv *max98925,
 		struct snd_pcm_hw_params *params)
 {
 	unsigned int dai_sr = 0, clock, mdll, n, m;
 	struct snd_soc_codec *codec = max98925->codec;
 	int rate = params_rate(params);
 	/* BCLK/LRCLK ratio calculation */
 	int blr_clk_ratio = params_channels(params) * max98925->ch_size;

 	switch (blr_clk_ratio) {
 	case 32:
 		regmap_update_bits(max98925->regmap,
 			MAX98925_DAI_CLK_MODE2,
 			M98925_DAI_BSEL_MASK, M98925_DAI_BSEL_32);
 		break;
 	case 48:
 		regmap_update_bits(max98925->regmap,
 			MAX98925_DAI_CLK_MODE2,
 			M98925_DAI_BSEL_MASK, M98925_DAI_BSEL_48);
 		break;
 	case 64:
 		regmap_update_bits(max98925->regmap,
 			MAX98925_DAI_CLK_MODE2,
 			M98925_DAI_BSEL_MASK, M98925_DAI_BSEL_64);
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (max98925->sysclk) {
 	case 6000000:
 		clock = 0;
 		mdll  = M98925_MDLL_MULT_MCLKx16;
 		break;
 	case 11289600:
 		clock = 1;
 		mdll  = M98925_MDLL_MULT_MCLKx8;
 		break;
 	case 12000000:
 		clock = 0;
 		mdll  = M98925_MDLL_MULT_MCLKx8;
 		break;
 	case 12288000:
 		clock = 2;
 		mdll  = M98925_MDLL_MULT_MCLKx8;
 		break;
 	default:
 		dev_info(max98925->codec->dev, "unsupported sysclk %d\n",
 					max98925->sysclk);
 		return -EINVAL;
 	}

 	if (max98925_rate_value(codec, rate, clock, &dai_sr, &n, &m))
 		return -EINVAL;

 	/* set DAI_SR to correct LRCLK frequency */
 	regmap_update_bits(max98925->regmap,
 			MAX98925_DAI_CLK_MODE2,
 			M98925_DAI_SR_MASK, dai_sr << M98925_DAI_SR_SHIFT);
 	/* set DAI m divider */
 	regmap_write(max98925->regmap,
 		MAX98925_DAI_CLK_DIV_M_MSBS, m >> 8);
 	regmap_write(max98925->regmap,
 		MAX98925_DAI_CLK_DIV_M_LSBS, m & 0xFF);
 	/* set DAI n divider */
 	regmap_write(max98925->regmap,
 		MAX98925_DAI_CLK_DIV_N_MSBS, n >> 8);
 	regmap_write(max98925->regmap,
 		MAX98925_DAI_CLK_DIV_N_LSBS, n & 0xFF);
 	/* set MDLL */
 	regmap_update_bits(max98925->regmap, MAX98925_DAI_CLK_MODE1,
 			M98925_MDLL_MULT_MASK, mdll << M98925_MDLL_MULT_SHIFT);
 	return 0;
 }

 static int max98925_dai_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 max98925_priv *max98925 = snd_soc_codec_get_drvdata(codec);

 	switch (snd_pcm_format_width(params_format(params))) {
 	case 16:
 		regmap_update_bits(max98925->regmap,
 				MAX98925_FORMAT,
 				M98925_DAI_CHANSZ_MASK, M98925_DAI_CHANSZ_16);
 		max98925->ch_size = 16;
 		break;
 	case 24:
 		regmap_update_bits(max98925->regmap,
 				MAX98925_FORMAT,
 				M98925_DAI_CHANSZ_MASK, M98925_DAI_CHANSZ_24);
 		max98925->ch_size = 24;
 		break;
 	case 32:
 		regmap_update_bits(max98925->regmap,
 				MAX98925_FORMAT,
 				M98925_DAI_CHANSZ_MASK, M98925_DAI_CHANSZ_32);
 		max98925->ch_size = 32;
 		break;
 	default:
 		pr_err("%s: format unsupported %d",
 				__func__, params_format(params));
 		return -EINVAL;
 	}
 	dev_dbg(codec->dev, "%s: format supported %d",
 				__func__, params_format(params));
 	return max98925_set_clock(max98925, params);
 }

 static int max98925_dai_set_sysclk(struct snd_soc_dai *dai,
 				   int clk_id, unsigned int freq, int dir)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	struct max98925_priv *max98925 = snd_soc_codec_get_drvdata(codec);

 	switch (clk_id) {
 	case 0:
 		/* use MCLK for Left channel, right channel always BCLK */
 		regmap_update_bits(max98925->regmap,
 				MAX98925_DAI_CLK_MODE1,
 				M98925_DAI_CLK_SOURCE_MASK, 0);
 		break;
 	case 1:
 		/* configure dai clock source to BCLK instead of MCLK */
 		regmap_update_bits(max98925->regmap,
 				MAX98925_DAI_CLK_MODE1,
 				M98925_DAI_CLK_SOURCE_MASK,
 				M98925_DAI_CLK_SOURCE_MASK);
 		break;
 	default:
 		return -EINVAL;
 	}
 	max98925->sysclk = freq;
 	return 0;
 }

 #define MAX98925_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
 			SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)

 static const struct snd_soc_dai_ops max98925_dai_ops = {
 	.set_sysclk = max98925_dai_set_sysclk,
 	.set_fmt = max98925_dai_set_fmt,
 	.hw_params = max98925_dai_hw_params,
 };

 static struct snd_soc_dai_driver max98925_dai[] = {
 	{
 		.name = "max98925-aif1",
 		.playback = {
 			.stream_name = "HiFi Playback",
 			.channels_min = 1,
 			.channels_max = 2,
 			.rates = SNDRV_PCM_RATE_8000_48000,
 			.formats = MAX98925_FORMATS,
 		},
 		.capture = {
 			.stream_name = "HiFi Capture",
 			.channels_min = 1,
 			.channels_max = 2,
 			.rates = SNDRV_PCM_RATE_8000_48000,
 			.formats = MAX98925_FORMATS,
 		},
 		.ops = &max98925_dai_ops,
 	}
 };

 static int max98925_probe(struct snd_soc_codec *codec)
 {
 	struct max98925_priv *max98925 = snd_soc_codec_get_drvdata(codec);

 	max98925->codec = codec;
 	regmap_write(max98925->regmap, MAX98925_GLOBAL_ENABLE, 0x00);
 	/* It's not the default but we need to set DAI_DLY */
 	regmap_write(max98925->regmap,
 			MAX98925_FORMAT, M98925_DAI_DLY_MASK);
 	regmap_write(max98925->regmap, MAX98925_TDM_SLOT_SELECT, 0xC8);
 	regmap_write(max98925->regmap, MAX98925_DOUT_HIZ_CFG1, 0xFF);
 	regmap_write(max98925->regmap, MAX98925_DOUT_HIZ_CFG2, 0xFF);
 	regmap_write(max98925->regmap, MAX98925_DOUT_HIZ_CFG3, 0xFF);
 	regmap_write(max98925->regmap, MAX98925_DOUT_HIZ_CFG4, 0xF0);
 	regmap_write(max98925->regmap, MAX98925_FILTERS, 0xD8);
 	regmap_write(max98925->regmap, MAX98925_ALC_CONFIGURATION, 0xF8);
 	regmap_write(max98925->regmap, MAX98925_CONFIGURATION, 0xF0);
 	/* Disable ALC muting */
 	regmap_write(max98925->regmap, MAX98925_BOOST_LIMITER, 0xF8);
 	return 0;
 }

 static const struct snd_soc_codec_driver soc_codec_dev_max98925 = {
 	.probe            = max98925_probe,
 	.controls = max98925_snd_controls,
 	.num_controls = ARRAY_SIZE(max98925_snd_controls),
 	.dapm_routes = max98925_audio_map,
 	.num_dapm_routes = ARRAY_SIZE(max98925_audio_map),
 	.dapm_widgets = max98925_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(max98925_dapm_widgets),
 };

 static const struct regmap_config max98925_regmap = {
 	.reg_bits         = 8,
 	.val_bits         = 8,
 	.max_register     = MAX98925_REV_VERSION,
 	.reg_defaults     = max98925_reg,
 	.num_reg_defaults = ARRAY_SIZE(max98925_reg),
 	.volatile_reg     = max98925_volatile_register,
 	.readable_reg     = max98925_readable_register,
 	.cache_type       = REGCACHE_RBTREE,
 };

 static int max98925_i2c_probe(struct i2c_client *i2c,
 			     const struct i2c_device_id *id)
 {
 	int ret, reg;
 	u32 value;
 	struct max98925_priv *max98925;

 	max98925 = devm_kzalloc(&i2c->dev,
 			sizeof(*max98925), GFP_KERNEL);
 	if (!max98925)
 		return -ENOMEM;

 	i2c_set_clientdata(i2c, max98925);
 	max98925->regmap = devm_regmap_init_i2c(i2c, &max98925_regmap);
 	if (IS_ERR(max98925->regmap)) {
 		ret = PTR_ERR(max98925->regmap);
 		dev_err(&i2c->dev,
 				"Failed to allocate regmap: %d\n", ret);
 		goto err_out;
 	}

 	if (!of_property_read_u32(i2c->dev.of_node, "vmon-slot-no", &value)) {
 		if (value > M98925_DAI_VMON_SLOT_1E_1F) {
 			dev_err(&i2c->dev, "vmon slot number is wrong:\n");
 			return -EINVAL;
 		}
 		max98925->v_slot = value;
 	}
 	if (!of_property_read_u32(i2c->dev.of_node, "imon-slot-no", &value)) {
 		if (value > M98925_DAI_IMON_SLOT_1E_1F) {
 			dev_err(&i2c->dev, "imon slot number is wrong:\n");
 			return -EINVAL;
 		}
 		max98925->i_slot = value;
 	}
 	ret = regmap_read(max98925->regmap,
 			MAX98925_REV_VERSION, &reg);
 	if ((ret < 0) ||
 		((reg != MAX98925_VERSION) &&
 		(reg != MAX98925_VERSION1))) {
 		dev_err(&i2c->dev,
 			"device initialization error (%d 0x%02X)\n",
 			ret, reg);
 		goto err_out;
 	}
 	dev_info(&i2c->dev, "device version 0x%02X\n", reg);

 	ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_max98925,
 			max98925_dai, ARRAY_SIZE(max98925_dai));
 	if (ret < 0)
 		dev_err(&i2c->dev,
 				"Failed to register codec: %d\n", ret);
 err_out:
 	return ret;
 }

 static int max98925_i2c_remove(struct i2c_client *client)
 {
 	snd_soc_unregister_codec(&client->dev);
 	return 0;
 }

 static const struct i2c_device_id max98925_i2c_id[] = {
 	{ "max98925", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, max98925_i2c_id);

 static const struct of_device_id max98925_of_match[] = {
 	{ .compatible = "maxim,max98925", },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, max98925_of_match);

 static struct i2c_driver max98925_i2c_driver = {
 	.driver = {
 		.name = "max98925",
 		.of_match_table = of_match_ptr(max98925_of_match),
 		.pm = NULL,
 	},
 	.probe  = max98925_i2c_probe,
 	.remove = max98925_i2c_remove,
 	.id_table = max98925_i2c_id,
 };

 module_i2c_driver(max98925_i2c_driver)

 MODULE_DESCRIPTION("ALSA SoC MAX98925 driver");
 MODULE_AUTHOR("Ralph Birt <rdbirt@gmail.com>, Anish kumar <anish.kumar@maximintegrated.com>");
 MODULE_LICENSE("GPL");
	/*
	* max98925.c -- ALSA SoC Stereo MAX98925 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 "max98925.h"

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

	static const char * const max98925_boost_voltage_text[] = {
	"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 SOC_ENUM_SINGLE_DECL(max98925_boost_voltage,
	MAX98925_CONFIGURATION, M98925_BST_VOUT_SHIFT,
	max98925_boost_voltage_text);

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

	static const struct reg_default max98925_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, 0x06 }, /* DAI Clock Mode 1 */
	{ 0x1B, 0xC0 }, /* 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 max98925_dai_enum =
	SOC_ENUM_SINGLE(MAX98925_GAIN, 5, ARRAY_SIZE(dai_text), dai_text);

	static const struct soc_enum max98925_hpf_enum =
	SOC_ENUM_SINGLE(MAX98925_FILTERS, 0, ARRAY_SIZE(hpf_text), hpf_text);

	static const struct snd_kcontrol_new max98925_hpf_sel_mux =
	SOC_DAPM_ENUM("Rc Filter MUX Mux", max98925_hpf_enum);

	static const struct snd_kcontrol_new max98925_dai_sel_mux =
	SOC_DAPM_ENUM("DAI IN MUX Mux", max98925_dai_enum);

	static int max98925_dac_event(struct snd_soc_dapm_widget *w,
	struct snd_kcontrol *kcontrol, int event)
	{
	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
	struct max98925_priv *max98925 = snd_soc_codec_get_drvdata(codec);

	switch (event) {
	case SND_SOC_DAPM_PRE_PMU:
	regmap_update_bits(max98925->regmap,
	MAX98925_BLOCK_ENABLE,
	M98925_BST_EN_MASK \|
	M98925_ADC_IMON_EN_MASK \| M98925_ADC_VMON_EN_MASK,
	M98925_BST_EN_MASK \|
	M98925_ADC_IMON_EN_MASK \| M98925_ADC_VMON_EN_MASK);
	break;
	case SND_SOC_DAPM_POST_PMD:
	regmap_update_bits(max98925->regmap,
	MAX98925_BLOCK_ENABLE, M98925_BST_EN_MASK \|
	M98925_ADC_IMON_EN_MASK \| M98925_ADC_VMON_EN_MASK, 0);
	break;
	default:
	return 0;
	}
	return 0;
	}

	static const struct snd_soc_dapm_widget max98925_dapm_widgets[] = {
	SND_SOC_DAPM_AIF_IN("DAI_OUT", "HiFi Playback", 0, SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_MUX("DAI IN MUX", SND_SOC_NOPM, 0, 0,
	&max98925_dai_sel_mux),
	SND_SOC_DAPM_MUX("Rc Filter MUX", SND_SOC_NOPM, 0, 0,
	&max98925_hpf_sel_mux),
	SND_SOC_DAPM_DAC_E("Amp Enable", NULL, MAX98925_BLOCK_ENABLE,
	M98925_SPK_EN_SHIFT, 0, max98925_dac_event,
	SND_SOC_DAPM_PRE_PMU \| SND_SOC_DAPM_POST_PMD),
	SND_SOC_DAPM_SUPPLY("Global Enable", MAX98925_GLOBAL_ENABLE,
	M98925_EN_SHIFT, 0, NULL, 0),
	SND_SOC_DAPM_OUTPUT("BE_OUT"),
	};

	static const struct snd_soc_dapm_route max98925_audio_map[] = {
	{"DAI IN MUX", "Left", "DAI_OUT"},
	{"DAI IN MUX", "Right", "DAI_OUT"},
	{"DAI IN MUX", "LeftRight", "DAI_OUT"},
	{"DAI IN MUX", "LeftRightDiv2", "DAI_OUT"},
	{"Rc Filter MUX", "Disable", "DAI IN MUX"},
	{"Rc Filter MUX", "DC Block", "DAI IN MUX"},
	{"Rc Filter MUX", "100Hz", "DAI IN MUX"},
	{"Rc Filter MUX", "200Hz", "DAI IN MUX"},
	{"Rc Filter MUX", "400Hz", "DAI IN MUX"},
	{"Rc Filter MUX", "800Hz", "DAI IN MUX"},
	{"Amp Enable", NULL, "Rc Filter MUX"},
	{"BE_OUT", NULL, "Amp Enable"},
	{"BE_OUT", NULL, "Global Enable"},
	};

	static bool max98925_volatile_register(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case MAX98925_VBAT_DATA:
	case MAX98925_VBST_DATA:
	case MAX98925_LIVE_STATUS0:
	case MAX98925_LIVE_STATUS1:
	case MAX98925_LIVE_STATUS2:
	case MAX98925_STATE0:
	case MAX98925_STATE1:
	case MAX98925_STATE2:
	case MAX98925_FLAG0:
	case MAX98925_FLAG1:
	case MAX98925_FLAG2:
	case MAX98925_REV_VERSION:
	return true;
	default:
	return false;
	}
	}

	static bool max98925_readable_register(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case MAX98925_IRQ_CLEAR0:
	case MAX98925_IRQ_CLEAR1:
	case MAX98925_IRQ_CLEAR2:
	case MAX98925_ALC_HOLD_RLS:
	return false;
	default:
	return true;
	}
	}

	static DECLARE_TLV_DB_SCALE(max98925_spk_tlv, -600, 100, 0);

	static const struct snd_kcontrol_new max98925_snd_controls[] = {
	SOC_SINGLE_TLV("Speaker Volume", MAX98925_GAIN,
	M98925_SPK_GAIN_SHIFT, (1<<M98925_SPK_GAIN_WIDTH)-1, 0,
	max98925_spk_tlv),
	SOC_SINGLE("Ramp Switch", MAX98925_GAIN_RAMPING,
	M98925_SPK_RMP_EN_SHIFT, 1, 0),
	SOC_SINGLE("ZCD Switch", MAX98925_GAIN_RAMPING,
	M98925_SPK_ZCD_EN_SHIFT, 1, 0),
	SOC_SINGLE("ALC Switch", MAX98925_THRESHOLD,
	M98925_ALC_EN_SHIFT, 1, 0),
	SOC_SINGLE("ALC Threshold", MAX98925_THRESHOLD, M98925_ALC_TH_SHIFT,
	(1<<M98925_ALC_TH_WIDTH)-1, 0),
	SOC_ENUM("Boost Output Voltage", max98925_boost_voltage),
	};

	/* codec sample rate and n/m dividers parameter table */
	static const struct {
	int rate;
	int sr;
	int divisors[3][2];
	} rate_table[] = {
	{
	.rate = 8000,
	.sr = 0,
	.divisors = { {1, 375}, {5, 1764}, {1, 384} }
	},
	{
	.rate = 11025,
	.sr = 1,
	.divisors = { {147, 40000}, {1, 256}, {147, 40960} }
	},
	{
	.rate = 12000,
	.sr = 2,
	.divisors = { {1, 250}, {5, 1176}, {1, 256} }
	},
	{
	.rate = 16000,
	.sr = 3,
	.divisors = { {2, 375}, {5, 882}, {1, 192} }
	},
	{
	.rate = 22050,
	.sr = 4,
	.divisors = { {147, 20000}, {1, 128}, {147, 20480} }
	},
	{
	.rate = 24000,
	.sr = 5,
	.divisors = { {1, 125}, {5, 588}, {1, 128} }
	},
	{
	.rate = 32000,
	.sr = 6,
	.divisors = { {4, 375}, {5, 441}, {1, 96} }
	},
	{
	.rate = 44100,
	.sr = 7,
	.divisors = { {147, 10000}, {1, 64}, {147, 10240} }
	},
	{
	.rate = 48000,
	.sr = 8,
	.divisors = { {2, 125}, {5, 294}, {1, 64} }
	},
	};

	static inline int max98925_rate_value(struct snd_soc_codec *codec,
	int rate, int clock, int value, int n, int *m)
	{
	int ret = -EINVAL;
	int i;

	for (i = 0; i < ARRAY_SIZE(rate_table); i++) {
	if (rate_table[i].rate >= rate) {
	*value = rate_table[i].sr;
	*n = rate_table[i].divisors[clock][0];
	*m = rate_table[i].divisors[clock][1];
	ret = 0;
	break;
	}
	}
	return ret;
	}

	static void max98925_set_sense_data(struct max98925_priv *max98925)
	{
	/* set VMON slots */
	regmap_update_bits(max98925->regmap,
	MAX98925_DOUT_CFG_VMON,
	M98925_DAI_VMON_EN_MASK, M98925_DAI_VMON_EN_MASK);
	regmap_update_bits(max98925->regmap,
	MAX98925_DOUT_CFG_VMON,
	M98925_DAI_VMON_SLOT_MASK,
	max98925->v_slot << M98925_DAI_VMON_SLOT_SHIFT);
	/* set IMON slots */
	regmap_update_bits(max98925->regmap,
	MAX98925_DOUT_CFG_IMON,
	M98925_DAI_IMON_EN_MASK, M98925_DAI_IMON_EN_MASK);
	regmap_update_bits(max98925->regmap,
	MAX98925_DOUT_CFG_IMON,
	M98925_DAI_IMON_SLOT_MASK,
	max98925->i_slot << M98925_DAI_IMON_SLOT_SHIFT);
	}

	static int max98925_dai_set_fmt(struct snd_soc_dai *codec_dai,
	unsigned int fmt)
	{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct max98925_priv *max98925 = 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:
	/* set DAI to slave mode */
	regmap_update_bits(max98925->regmap,
	MAX98925_DAI_CLK_MODE2,
	M98925_DAI_MAS_MASK, 0);
	max98925_set_sense_data(max98925);
	break;
	case SND_SOC_DAIFMT_CBM_CFM:
	/*
	* set left channel DAI to master mode,
	* right channel always slave
	*/
	regmap_update_bits(max98925->regmap,
	MAX98925_DAI_CLK_MODE2,
	M98925_DAI_MAS_MASK, M98925_DAI_MAS_MASK);
	break;
	case SND_SOC_DAIFMT_CBS_CFM:
	case SND_SOC_DAIFMT_CBM_CFS:
	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 = M98925_DAI_WCI_MASK;
	break;
	case SND_SOC_DAIFMT_IB_NF:
	invert = M98925_DAI_BCI_MASK;
	break;
	case SND_SOC_DAIFMT_IB_IF:
	invert = M98925_DAI_BCI_MASK \| M98925_DAI_WCI_MASK;
	break;
	default:
	dev_err(codec->dev, "DAI invert mode unsupported");
	return -EINVAL;
	}

	regmap_update_bits(max98925->regmap, MAX98925_FORMAT,
	M98925_DAI_BCI_MASK \| M98925_DAI_WCI_MASK, invert);
	return 0;
	}

	static int max98925_set_clock(struct max98925_priv *max98925,
	struct snd_pcm_hw_params *params)
	{
	unsigned int dai_sr = 0, clock, mdll, n, m;
	struct snd_soc_codec *codec = max98925->codec;
	int rate = params_rate(params);
	/* BCLK/LRCLK ratio calculation */
	int blr_clk_ratio = params_channels(params) * max98925->ch_size;

	switch (blr_clk_ratio) {
	case 32:
	regmap_update_bits(max98925->regmap,
	MAX98925_DAI_CLK_MODE2,
	M98925_DAI_BSEL_MASK, M98925_DAI_BSEL_32);
	break;
	case 48:
	regmap_update_bits(max98925->regmap,
	MAX98925_DAI_CLK_MODE2,
	M98925_DAI_BSEL_MASK, M98925_DAI_BSEL_48);
	break;
	case 64:
	regmap_update_bits(max98925->regmap,
	MAX98925_DAI_CLK_MODE2,
	M98925_DAI_BSEL_MASK, M98925_DAI_BSEL_64);
	break;
	default:
	return -EINVAL;
	}

	switch (max98925->sysclk) {
	case 6000000:
	clock = 0;
	mdll = M98925_MDLL_MULT_MCLKx16;
	break;
	case 11289600:
	clock = 1;
	mdll = M98925_MDLL_MULT_MCLKx8;
	break;
	case 12000000:
	clock = 0;
	mdll = M98925_MDLL_MULT_MCLKx8;
	break;
	case 12288000:
	clock = 2;
	mdll = M98925_MDLL_MULT_MCLKx8;
	break;
	default:
	dev_info(max98925->codec->dev, "unsupported sysclk %d\n",
	max98925->sysclk);
	return -EINVAL;
	}

	if (max98925_rate_value(codec, rate, clock, &dai_sr, &n, &m))
	return -EINVAL;

	/* set DAI_SR to correct LRCLK frequency */
	regmap_update_bits(max98925->regmap,
	MAX98925_DAI_CLK_MODE2,
	M98925_DAI_SR_MASK, dai_sr << M98925_DAI_SR_SHIFT);
	/* set DAI m divider */
	regmap_write(max98925->regmap,
	MAX98925_DAI_CLK_DIV_M_MSBS, m >> 8);
	regmap_write(max98925->regmap,
	MAX98925_DAI_CLK_DIV_M_LSBS, m & 0xFF);
	/* set DAI n divider */
	regmap_write(max98925->regmap,
	MAX98925_DAI_CLK_DIV_N_MSBS, n >> 8);
	regmap_write(max98925->regmap,
	MAX98925_DAI_CLK_DIV_N_LSBS, n & 0xFF);
	/* set MDLL */
	regmap_update_bits(max98925->regmap, MAX98925_DAI_CLK_MODE1,
	M98925_MDLL_MULT_MASK, mdll << M98925_MDLL_MULT_SHIFT);
	return 0;
	}

	static int max98925_dai_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 max98925_priv *max98925 = snd_soc_codec_get_drvdata(codec);

	switch (snd_pcm_format_width(params_format(params))) {
	case 16:
	regmap_update_bits(max98925->regmap,
	MAX98925_FORMAT,
	M98925_DAI_CHANSZ_MASK, M98925_DAI_CHANSZ_16);
	max98925->ch_size = 16;
	break;
	case 24:
	regmap_update_bits(max98925->regmap,
	MAX98925_FORMAT,
	M98925_DAI_CHANSZ_MASK, M98925_DAI_CHANSZ_24);
	max98925->ch_size = 24;
	break;
	case 32:
	regmap_update_bits(max98925->regmap,
	MAX98925_FORMAT,
	M98925_DAI_CHANSZ_MASK, M98925_DAI_CHANSZ_32);
	max98925->ch_size = 32;
	break;
	default:
	pr_err("%s: format unsupported %d",
	__func__, params_format(params));
	return -EINVAL;
	}
	dev_dbg(codec->dev, "%s: format supported %d",
	__func__, params_format(params));
	return max98925_set_clock(max98925, params);
	}

	static int max98925_dai_set_sysclk(struct snd_soc_dai *dai,
	int clk_id, unsigned int freq, int dir)
	{
	struct snd_soc_codec *codec = dai->codec;
	struct max98925_priv *max98925 = snd_soc_codec_get_drvdata(codec);

	switch (clk_id) {
	case 0:
	/* use MCLK for Left channel, right channel always BCLK */
	regmap_update_bits(max98925->regmap,
	MAX98925_DAI_CLK_MODE1,
	M98925_DAI_CLK_SOURCE_MASK, 0);
	break;
	case 1:
	/* configure dai clock source to BCLK instead of MCLK */
	regmap_update_bits(max98925->regmap,
	MAX98925_DAI_CLK_MODE1,
	M98925_DAI_CLK_SOURCE_MASK,
	M98925_DAI_CLK_SOURCE_MASK);
	break;
	default:
	return -EINVAL;
	}
	max98925->sysclk = freq;
	return 0;
	}

	#define MAX98925_FORMATS (SNDRV_PCM_FMTBIT_S16_LE \| \
	SNDRV_PCM_FMTBIT_S24_LE \| SNDRV_PCM_FMTBIT_S32_LE)

	static const struct snd_soc_dai_ops max98925_dai_ops = {
	.set_sysclk = max98925_dai_set_sysclk,
	.set_fmt = max98925_dai_set_fmt,
	.hw_params = max98925_dai_hw_params,
	};

	static struct snd_soc_dai_driver max98925_dai[] = {
	{
	.name = "max98925-aif1",
	.playback = {
	.stream_name = "HiFi Playback",
	.channels_min = 1,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_48000,
	.formats = MAX98925_FORMATS,
	},
	.capture = {
	.stream_name = "HiFi Capture",
	.channels_min = 1,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_48000,
	.formats = MAX98925_FORMATS,
	},
	.ops = &max98925_dai_ops,
	}
	};

	static int max98925_probe(struct snd_soc_codec *codec)
	{
	struct max98925_priv *max98925 = snd_soc_codec_get_drvdata(codec);

	max98925->codec = codec;
	regmap_write(max98925->regmap, MAX98925_GLOBAL_ENABLE, 0x00);
	/* It's not the default but we need to set DAI_DLY */
	regmap_write(max98925->regmap,
	MAX98925_FORMAT, M98925_DAI_DLY_MASK);
	regmap_write(max98925->regmap, MAX98925_TDM_SLOT_SELECT, 0xC8);
	regmap_write(max98925->regmap, MAX98925_DOUT_HIZ_CFG1, 0xFF);
	regmap_write(max98925->regmap, MAX98925_DOUT_HIZ_CFG2, 0xFF);
	regmap_write(max98925->regmap, MAX98925_DOUT_HIZ_CFG3, 0xFF);
	regmap_write(max98925->regmap, MAX98925_DOUT_HIZ_CFG4, 0xF0);
	regmap_write(max98925->regmap, MAX98925_FILTERS, 0xD8);
	regmap_write(max98925->regmap, MAX98925_ALC_CONFIGURATION, 0xF8);
	regmap_write(max98925->regmap, MAX98925_CONFIGURATION, 0xF0);
	/* Disable ALC muting */
	regmap_write(max98925->regmap, MAX98925_BOOST_LIMITER, 0xF8);
	return 0;
	}

	static const struct snd_soc_codec_driver soc_codec_dev_max98925 = {
	.probe = max98925_probe,
	.controls = max98925_snd_controls,
	.num_controls = ARRAY_SIZE(max98925_snd_controls),
	.dapm_routes = max98925_audio_map,
	.num_dapm_routes = ARRAY_SIZE(max98925_audio_map),
	.dapm_widgets = max98925_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(max98925_dapm_widgets),
	};

	static const struct regmap_config max98925_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = MAX98925_REV_VERSION,
	.reg_defaults = max98925_reg,
	.num_reg_defaults = ARRAY_SIZE(max98925_reg),
	.volatile_reg = max98925_volatile_register,
	.readable_reg = max98925_readable_register,
	.cache_type = REGCACHE_RBTREE,
	};

	static int max98925_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	int ret, reg;
	u32 value;
	struct max98925_priv *max98925;

	max98925 = devm_kzalloc(&i2c->dev,
	sizeof(*max98925), GFP_KERNEL);
	if (!max98925)
	return -ENOMEM;

	i2c_set_clientdata(i2c, max98925);
	max98925->regmap = devm_regmap_init_i2c(i2c, &max98925_regmap);
	if (IS_ERR(max98925->regmap)) {
	ret = PTR_ERR(max98925->regmap);
	dev_err(&i2c->dev,
	"Failed to allocate regmap: %d\n", ret);
	goto err_out;
	}

	if (!of_property_read_u32(i2c->dev.of_node, "vmon-slot-no", &value)) {
	if (value > M98925_DAI_VMON_SLOT_1E_1F) {
	dev_err(&i2c->dev, "vmon slot number is wrong:\n");
	return -EINVAL;
	}
	max98925->v_slot = value;
	}
	if (!of_property_read_u32(i2c->dev.of_node, "imon-slot-no", &value)) {
	if (value > M98925_DAI_IMON_SLOT_1E_1F) {
	dev_err(&i2c->dev, "imon slot number is wrong:\n");
	return -EINVAL;
	}
	max98925->i_slot = value;
	}
	ret = regmap_read(max98925->regmap,
	MAX98925_REV_VERSION, &reg);
	if ((ret < 0) \|\|
	((reg != MAX98925_VERSION) &&
	(reg != MAX98925_VERSION1))) {
	dev_err(&i2c->dev,
	"device initialization error (%d 0x%02X)\n",
	ret, reg);
	goto err_out;
	}
	dev_info(&i2c->dev, "device version 0x%02X\n", reg);

	ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_max98925,
	max98925_dai, ARRAY_SIZE(max98925_dai));
	if (ret < 0)
	dev_err(&i2c->dev,
	"Failed to register codec: %d\n", ret);
	err_out:
	return ret;
	}

	static int max98925_i2c_remove(struct i2c_client *client)
	{
	snd_soc_unregister_codec(&client->dev);
	return 0;
	}

	static const struct i2c_device_id max98925_i2c_id[] = {
	{ "max98925", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, max98925_i2c_id);

	static const struct of_device_id max98925_of_match[] = {
	{ .compatible = "maxim,max98925", },
	{ }
	};
	MODULE_DEVICE_TABLE(of, max98925_of_match);

	static struct i2c_driver max98925_i2c_driver = {
	.driver = {
	.name = "max98925",
	.of_match_table = of_match_ptr(max98925_of_match),
	.pm = NULL,
	},
	.probe = max98925_i2c_probe,
	.remove = max98925_i2c_remove,
	.id_table = max98925_i2c_id,
	};

	module_i2c_driver(max98925_i2c_driver)

	MODULE_DESCRIPTION("ALSA SoC MAX98925 driver");
	MODULE_AUTHOR("Ralph Birt <rdbirt@gmail.com>, Anish kumar <anish.kumar@maximintegrated.com>");
	MODULE_LICENSE("GPL");