sound/soc/codecs/cs42l51.c - kernel/msm-4.19 - Gitiles

 /*
  * cs42l51.c
  *
  * ASoC Driver for Cirrus Logic CS42L51 codecs
  *
  * Copyright (c) 2010 Arnaud Patard <apatard@mandriva.com>
  *
  * Based on cs4270.c - Copyright (c) Freescale Semiconductor
  *
  * 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.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * For now:
  *  - Only I2C is support. Not SPI
  *  - master mode *NOT* supported
  */

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

 #include "cs42l51.h"

 enum master_slave_mode {
 	MODE_SLAVE,
 	MODE_SLAVE_AUTO,
 	MODE_MASTER,
 };

 struct cs42l51_private {
 	unsigned int mclk;
 	unsigned int audio_mode;	/* The mode (I2S or left-justified) */
 	enum master_slave_mode func;
 };

 #define CS42L51_FORMATS ( \
 		SNDRV_PCM_FMTBIT_S16_LE  | SNDRV_PCM_FMTBIT_S16_BE  | \
 		SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S18_3BE | \
 		SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE | \
 		SNDRV_PCM_FMTBIT_S24_LE  | SNDRV_PCM_FMTBIT_S24_BE)

 static int cs42l51_get_chan_mix(struct snd_kcontrol *kcontrol,
 			struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
 	unsigned long value = snd_soc_read(codec, CS42L51_PCM_MIXER)&3;

 	switch (value) {
 	default:
 	case 0:
 		ucontrol->value.integer.value[0] = 0;
 		break;
 	/* same value : (L+R)/2 and (R+L)/2 */
 	case 1:
 	case 2:
 		ucontrol->value.integer.value[0] = 1;
 		break;
 	case 3:
 		ucontrol->value.integer.value[0] = 2;
 		break;
 	}

 	return 0;
 }

 #define CHAN_MIX_NORMAL	0x00
 #define CHAN_MIX_BOTH	0x55
 #define CHAN_MIX_SWAP	0xFF

 static int cs42l51_set_chan_mix(struct snd_kcontrol *kcontrol,
 			struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
 	unsigned char val;

 	switch (ucontrol->value.integer.value[0]) {
 	default:
 	case 0:
 		val = CHAN_MIX_NORMAL;
 		break;
 	case 1:
 		val = CHAN_MIX_BOTH;
 		break;
 	case 2:
 		val = CHAN_MIX_SWAP;
 		break;
 	}

 	snd_soc_write(codec, CS42L51_PCM_MIXER, val);

 	return 1;
 }

 static const DECLARE_TLV_DB_SCALE(adc_pcm_tlv, -5150, 50, 0);
 static const DECLARE_TLV_DB_SCALE(tone_tlv, -1050, 150, 0);

 static const DECLARE_TLV_DB_SCALE(aout_tlv, -10200, 50, 0);

 static const DECLARE_TLV_DB_SCALE(boost_tlv, 1600, 1600, 0);
 static const char *chan_mix[] = {
 	"L R",
 	"L+R",
 	"R L",
 };

 static SOC_ENUM_SINGLE_EXT_DECL(cs42l51_chan_mix, chan_mix);

 static const struct snd_kcontrol_new cs42l51_snd_controls[] = {
 	SOC_DOUBLE_R_SX_TLV("PCM Playback Volume",
 			CS42L51_PCMA_VOL, CS42L51_PCMB_VOL,
 			0, 0x19, 0x7F, adc_pcm_tlv),
 	SOC_DOUBLE_R("PCM Playback Switch",
 			CS42L51_PCMA_VOL, CS42L51_PCMB_VOL, 7, 1, 1),
 	SOC_DOUBLE_R_SX_TLV("Analog Playback Volume",
 			CS42L51_AOUTA_VOL, CS42L51_AOUTB_VOL,
 			0, 0x34, 0xE4, aout_tlv),
 	SOC_DOUBLE_R_SX_TLV("ADC Mixer Volume",
 			CS42L51_ADCA_VOL, CS42L51_ADCB_VOL,
 			0, 0x19, 0x7F, adc_pcm_tlv),
 	SOC_DOUBLE_R("ADC Mixer Switch",
 			CS42L51_ADCA_VOL, CS42L51_ADCB_VOL, 7, 1, 1),
 	SOC_SINGLE("Playback Deemphasis Switch", CS42L51_DAC_CTL, 3, 1, 0),
 	SOC_SINGLE("Auto-Mute Switch", CS42L51_DAC_CTL, 2, 1, 0),
 	SOC_SINGLE("Soft Ramp Switch", CS42L51_DAC_CTL, 1, 1, 0),
 	SOC_SINGLE("Zero Cross Switch", CS42L51_DAC_CTL, 0, 0, 0),
 	SOC_DOUBLE_TLV("Mic Boost Volume",
 			CS42L51_MIC_CTL, 0, 1, 1, 0, boost_tlv),
 	SOC_SINGLE_TLV("Bass Volume", CS42L51_TONE_CTL, 0, 0xf, 1, tone_tlv),
 	SOC_SINGLE_TLV("Treble Volume", CS42L51_TONE_CTL, 4, 0xf, 1, tone_tlv),
 	SOC_ENUM_EXT("PCM channel mixer",
 			cs42l51_chan_mix,
 			cs42l51_get_chan_mix, cs42l51_set_chan_mix),
 };

 /*
  * to power down, one must:
  * 1.) Enable the PDN bit
  * 2.) enable power-down for the select channels
  * 3.) disable the PDN bit.
  */
 static int cs42l51_pdn_event(struct snd_soc_dapm_widget *w,
 		struct snd_kcontrol *kcontrol, int event)
 {
 	switch (event) {
 	case SND_SOC_DAPM_PRE_PMD:
 		snd_soc_update_bits(w->codec, CS42L51_POWER_CTL1,
 				    CS42L51_POWER_CTL1_PDN,
 				    CS42L51_POWER_CTL1_PDN);
 		break;
 	default:
 	case SND_SOC_DAPM_POST_PMD:
 		snd_soc_update_bits(w->codec, CS42L51_POWER_CTL1,
 				    CS42L51_POWER_CTL1_PDN, 0);
 		break;
 	}

 	return 0;
 }

 static const char *cs42l51_dac_names[] = {"Direct PCM",
 	"DSP PCM", "ADC"};
 static SOC_ENUM_SINGLE_DECL(cs42l51_dac_mux_enum,
 			    CS42L51_DAC_CTL, 6, cs42l51_dac_names);
 static const struct snd_kcontrol_new cs42l51_dac_mux_controls =
 	SOC_DAPM_ENUM("Route", cs42l51_dac_mux_enum);

 static const char *cs42l51_adcl_names[] = {"AIN1 Left", "AIN2 Left",
 	"MIC Left", "MIC+preamp Left"};
 static SOC_ENUM_SINGLE_DECL(cs42l51_adcl_mux_enum,
 			    CS42L51_ADC_INPUT, 4, cs42l51_adcl_names);
 static const struct snd_kcontrol_new cs42l51_adcl_mux_controls =
 	SOC_DAPM_ENUM("Route", cs42l51_adcl_mux_enum);

 static const char *cs42l51_adcr_names[] = {"AIN1 Right", "AIN2 Right",
 	"MIC Right", "MIC+preamp Right"};
 static SOC_ENUM_SINGLE_DECL(cs42l51_adcr_mux_enum,
 			    CS42L51_ADC_INPUT, 6, cs42l51_adcr_names);
 static const struct snd_kcontrol_new cs42l51_adcr_mux_controls =
 	SOC_DAPM_ENUM("Route", cs42l51_adcr_mux_enum);

 static const struct snd_soc_dapm_widget cs42l51_dapm_widgets[] = {
 	SND_SOC_DAPM_MICBIAS("Mic Bias", CS42L51_MIC_POWER_CTL, 1, 1),
 	SND_SOC_DAPM_PGA_E("Left PGA", CS42L51_POWER_CTL1, 3, 1, NULL, 0,
 		cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),
 	SND_SOC_DAPM_PGA_E("Right PGA", CS42L51_POWER_CTL1, 4, 1, NULL, 0,
 		cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),
 	SND_SOC_DAPM_ADC_E("Left ADC", "Left HiFi Capture",
 		CS42L51_POWER_CTL1, 1, 1,
 		cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),
 	SND_SOC_DAPM_ADC_E("Right ADC", "Right HiFi Capture",
 		CS42L51_POWER_CTL1, 2, 1,
 		cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),
 	SND_SOC_DAPM_DAC_E("Left DAC", "Left HiFi Playback",
 		CS42L51_POWER_CTL1, 5, 1,
 		cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),
 	SND_SOC_DAPM_DAC_E("Right DAC", "Right HiFi Playback",
 		CS42L51_POWER_CTL1, 6, 1,
 		cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),

 	/* analog/mic */
 	SND_SOC_DAPM_INPUT("AIN1L"),
 	SND_SOC_DAPM_INPUT("AIN1R"),
 	SND_SOC_DAPM_INPUT("AIN2L"),
 	SND_SOC_DAPM_INPUT("AIN2R"),
 	SND_SOC_DAPM_INPUT("MICL"),
 	SND_SOC_DAPM_INPUT("MICR"),

 	SND_SOC_DAPM_MIXER("Mic Preamp Left",
 		CS42L51_MIC_POWER_CTL, 2, 1, NULL, 0),
 	SND_SOC_DAPM_MIXER("Mic Preamp Right",
 		CS42L51_MIC_POWER_CTL, 3, 1, NULL, 0),

 	/* HP */
 	SND_SOC_DAPM_OUTPUT("HPL"),
 	SND_SOC_DAPM_OUTPUT("HPR"),

 	/* mux */
 	SND_SOC_DAPM_MUX("DAC Mux", SND_SOC_NOPM, 0, 0,
 		&cs42l51_dac_mux_controls),
 	SND_SOC_DAPM_MUX("PGA-ADC Mux Left", SND_SOC_NOPM, 0, 0,
 		&cs42l51_adcl_mux_controls),
 	SND_SOC_DAPM_MUX("PGA-ADC Mux Right", SND_SOC_NOPM, 0, 0,
 		&cs42l51_adcr_mux_controls),
 };

 static const struct snd_soc_dapm_route cs42l51_routes[] = {
 	{"HPL", NULL, "Left DAC"},
 	{"HPR", NULL, "Right DAC"},

 	{"Left ADC", NULL, "Left PGA"},
 	{"Right ADC", NULL, "Right PGA"},

 	{"Mic Preamp Left",  NULL,  "MICL"},
 	{"Mic Preamp Right", NULL,  "MICR"},

 	{"PGA-ADC Mux Left",  "AIN1 Left",        "AIN1L" },
 	{"PGA-ADC Mux Left",  "AIN2 Left",        "AIN2L" },
 	{"PGA-ADC Mux Left",  "MIC Left",         "MICL"  },
 	{"PGA-ADC Mux Left",  "MIC+preamp Left",  "Mic Preamp Left" },
 	{"PGA-ADC Mux Right", "AIN1 Right",       "AIN1R" },
 	{"PGA-ADC Mux Right", "AIN2 Right",       "AIN2R" },
 	{"PGA-ADC Mux Right", "MIC Right",        "MICR" },
 	{"PGA-ADC Mux Right", "MIC+preamp Right", "Mic Preamp Right" },

 	{"Left PGA", NULL, "PGA-ADC Mux Left"},
 	{"Right PGA", NULL, "PGA-ADC Mux Right"},
 };

 static int cs42l51_set_dai_fmt(struct snd_soc_dai *codec_dai,
 		unsigned int format)
 {
 	struct snd_soc_codec *codec = codec_dai->codec;
 	struct cs42l51_private *cs42l51 = snd_soc_codec_get_drvdata(codec);

 	switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_I2S:
 	case SND_SOC_DAIFMT_LEFT_J:
 	case SND_SOC_DAIFMT_RIGHT_J:
 		cs42l51->audio_mode = format & SND_SOC_DAIFMT_FORMAT_MASK;
 		break;
 	default:
 		dev_err(codec->dev, "invalid DAI format\n");
 		return -EINVAL;
 	}

 	switch (format & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBM_CFM:
 		cs42l51->func = MODE_MASTER;
 		break;
 	case SND_SOC_DAIFMT_CBS_CFS:
 		cs42l51->func = MODE_SLAVE_AUTO;
 		break;
 	default:
 		dev_err(codec->dev, "Unknown master/slave configuration\n");
 		return -EINVAL;
 	}

 	return 0;
 }

 struct cs42l51_ratios {
 	unsigned int ratio;
 	unsigned char speed_mode;
 	unsigned char mclk;
 };

 static struct cs42l51_ratios slave_ratios[] = {
 	{  512, CS42L51_QSM_MODE, 0 }, {  768, CS42L51_QSM_MODE, 0 },
 	{ 1024, CS42L51_QSM_MODE, 0 }, { 1536, CS42L51_QSM_MODE, 0 },
 	{ 2048, CS42L51_QSM_MODE, 0 }, { 3072, CS42L51_QSM_MODE, 0 },
 	{  256, CS42L51_HSM_MODE, 0 }, {  384, CS42L51_HSM_MODE, 0 },
 	{  512, CS42L51_HSM_MODE, 0 }, {  768, CS42L51_HSM_MODE, 0 },
 	{ 1024, CS42L51_HSM_MODE, 0 }, { 1536, CS42L51_HSM_MODE, 0 },
 	{  128, CS42L51_SSM_MODE, 0 }, {  192, CS42L51_SSM_MODE, 0 },
 	{  256, CS42L51_SSM_MODE, 0 }, {  384, CS42L51_SSM_MODE, 0 },
 	{  512, CS42L51_SSM_MODE, 0 }, {  768, CS42L51_SSM_MODE, 0 },
 	{  128, CS42L51_DSM_MODE, 0 }, {  192, CS42L51_DSM_MODE, 0 },
 	{  256, CS42L51_DSM_MODE, 0 }, {  384, CS42L51_DSM_MODE, 0 },
 };

 static struct cs42l51_ratios slave_auto_ratios[] = {
 	{ 1024, CS42L51_QSM_MODE, 0 }, { 1536, CS42L51_QSM_MODE, 0 },
 	{ 2048, CS42L51_QSM_MODE, 1 }, { 3072, CS42L51_QSM_MODE, 1 },
 	{  512, CS42L51_HSM_MODE, 0 }, {  768, CS42L51_HSM_MODE, 0 },
 	{ 1024, CS42L51_HSM_MODE, 1 }, { 1536, CS42L51_HSM_MODE, 1 },
 	{  256, CS42L51_SSM_MODE, 0 }, {  384, CS42L51_SSM_MODE, 0 },
 	{  512, CS42L51_SSM_MODE, 1 }, {  768, CS42L51_SSM_MODE, 1 },
 	{  128, CS42L51_DSM_MODE, 0 }, {  192, CS42L51_DSM_MODE, 0 },
 	{  256, CS42L51_DSM_MODE, 1 }, {  384, CS42L51_DSM_MODE, 1 },
 };

 static int cs42l51_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 		int clk_id, unsigned int freq, int dir)
 {
 	struct snd_soc_codec *codec = codec_dai->codec;
 	struct cs42l51_private *cs42l51 = snd_soc_codec_get_drvdata(codec);

 	cs42l51->mclk = freq;
 	return 0;
 }

 static int cs42l51_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 cs42l51_private *cs42l51 = snd_soc_codec_get_drvdata(codec);
 	int ret;
 	unsigned int i;
 	unsigned int rate;
 	unsigned int ratio;
 	struct cs42l51_ratios *ratios = NULL;
 	int nr_ratios = 0;
 	int intf_ctl, power_ctl, fmt;

 	switch (cs42l51->func) {
 	case MODE_MASTER:
 		return -EINVAL;
 	case MODE_SLAVE:
 		ratios = slave_ratios;
 		nr_ratios = ARRAY_SIZE(slave_ratios);
 		break;
 	case MODE_SLAVE_AUTO:
 		ratios = slave_auto_ratios;
 		nr_ratios = ARRAY_SIZE(slave_auto_ratios);
 		break;
 	}

 	/* Figure out which MCLK/LRCK ratio to use */
 	rate = params_rate(params);     /* Sampling rate, in Hz */
 	ratio = cs42l51->mclk / rate;    /* MCLK/LRCK ratio */
 	for (i = 0; i < nr_ratios; i++) {
 		if (ratios[i].ratio == ratio)
 			break;
 	}

 	if (i == nr_ratios) {
 		/* We did not find a matching ratio */
 		dev_err(codec->dev, "could not find matching ratio\n");
 		return -EINVAL;
 	}

 	intf_ctl = snd_soc_read(codec, CS42L51_INTF_CTL);
 	power_ctl = snd_soc_read(codec, CS42L51_MIC_POWER_CTL);

 	intf_ctl &= ~(CS42L51_INTF_CTL_MASTER | CS42L51_INTF_CTL_ADC_I2S
 			| CS42L51_INTF_CTL_DAC_FORMAT(7));
 	power_ctl &= ~(CS42L51_MIC_POWER_CTL_SPEED(3)
 			| CS42L51_MIC_POWER_CTL_MCLK_DIV2);

 	switch (cs42l51->func) {
 	case MODE_MASTER:
 		intf_ctl |= CS42L51_INTF_CTL_MASTER;
 		power_ctl |= CS42L51_MIC_POWER_CTL_SPEED(ratios[i].speed_mode);
 		break;
 	case MODE_SLAVE:
 		power_ctl |= CS42L51_MIC_POWER_CTL_SPEED(ratios[i].speed_mode);
 		break;
 	case MODE_SLAVE_AUTO:
 		power_ctl |= CS42L51_MIC_POWER_CTL_AUTO;
 		break;
 	}

 	switch (cs42l51->audio_mode) {
 	case SND_SOC_DAIFMT_I2S:
 		intf_ctl |= CS42L51_INTF_CTL_ADC_I2S;
 		intf_ctl |= CS42L51_INTF_CTL_DAC_FORMAT(CS42L51_DAC_DIF_I2S);
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		intf_ctl |= CS42L51_INTF_CTL_DAC_FORMAT(CS42L51_DAC_DIF_LJ24);
 		break;
 	case SND_SOC_DAIFMT_RIGHT_J:
 		switch (params_width(params)) {
 		case 16:
 			fmt = CS42L51_DAC_DIF_RJ16;
 			break;
 		case 18:
 			fmt = CS42L51_DAC_DIF_RJ18;
 			break;
 		case 20:
 			fmt = CS42L51_DAC_DIF_RJ20;
 			break;
 		case 24:
 			fmt = CS42L51_DAC_DIF_RJ24;
 			break;
 		default:
 			dev_err(codec->dev, "unknown format\n");
 			return -EINVAL;
 		}
 		intf_ctl |= CS42L51_INTF_CTL_DAC_FORMAT(fmt);
 		break;
 	default:
 		dev_err(codec->dev, "unknown format\n");
 		return -EINVAL;
 	}

 	if (ratios[i].mclk)
 		power_ctl |= CS42L51_MIC_POWER_CTL_MCLK_DIV2;

 	ret = snd_soc_write(codec, CS42L51_INTF_CTL, intf_ctl);
 	if (ret < 0)
 		return ret;

 	ret = snd_soc_write(codec, CS42L51_MIC_POWER_CTL, power_ctl);
 	if (ret < 0)
 		return ret;

 	return 0;
 }

 static int cs42l51_dai_mute(struct snd_soc_dai *dai, int mute)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	int reg;
 	int mask = CS42L51_DAC_OUT_CTL_DACA_MUTE|CS42L51_DAC_OUT_CTL_DACB_MUTE;

 	reg = snd_soc_read(codec, CS42L51_DAC_OUT_CTL);

 	if (mute)
 		reg |= mask;
 	else
 		reg &= ~mask;

 	return snd_soc_write(codec, CS42L51_DAC_OUT_CTL, reg);
 }

 static const struct snd_soc_dai_ops cs42l51_dai_ops = {
 	.hw_params      = cs42l51_hw_params,
 	.set_sysclk     = cs42l51_set_dai_sysclk,
 	.set_fmt        = cs42l51_set_dai_fmt,
 	.digital_mute   = cs42l51_dai_mute,
 };

 static struct snd_soc_dai_driver cs42l51_dai = {
 	.name = "cs42l51-hifi",
 	.playback = {
 		.stream_name = "Playback",
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_8000_96000,
 		.formats = CS42L51_FORMATS,
 	},
 	.capture = {
 		.stream_name = "Capture",
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_8000_96000,
 		.formats = CS42L51_FORMATS,
 	},
 	.ops = &cs42l51_dai_ops,
 };

 static int cs42l51_codec_probe(struct snd_soc_codec *codec)
 {
 	int ret, reg;

 	/*
 	 * DAC configuration
 	 * - Use signal processor
 	 * - auto mute
 	 * - vol changes immediate
 	 * - no de-emphasize
 	 */
 	reg = CS42L51_DAC_CTL_DATA_SEL(1)
 		| CS42L51_DAC_CTL_AMUTE | CS42L51_DAC_CTL_DACSZ(0);
 	ret = snd_soc_write(codec, CS42L51_DAC_CTL, reg);
 	if (ret < 0)
 		return ret;

 	return 0;
 }

 static struct snd_soc_codec_driver soc_codec_device_cs42l51 = {
 	.probe = cs42l51_codec_probe,

 	.controls = cs42l51_snd_controls,
 	.num_controls = ARRAY_SIZE(cs42l51_snd_controls),
 	.dapm_widgets = cs42l51_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(cs42l51_dapm_widgets),
 	.dapm_routes = cs42l51_routes,
 	.num_dapm_routes = ARRAY_SIZE(cs42l51_routes),
 };

 const struct regmap_config cs42l51_regmap = {
 	.max_register = CS42L51_CHARGE_FREQ,
 	.cache_type = REGCACHE_RBTREE,
 };
 EXPORT_SYMBOL_GPL(cs42l51_regmap);

 int cs42l51_probe(struct device *dev, struct regmap *regmap)
 {
 	struct cs42l51_private *cs42l51;
 	unsigned int val;
 	int ret;

 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);

 	cs42l51 = devm_kzalloc(dev, sizeof(struct cs42l51_private),
 			       GFP_KERNEL);
 	if (!cs42l51)
 		return -ENOMEM;

 	dev_set_drvdata(dev, cs42l51);

 	/* Verify that we have a CS42L51 */
 	ret = regmap_read(regmap, CS42L51_CHIP_REV_ID, &val);
 	if (ret < 0) {
 		dev_err(dev, "failed to read I2C\n");
 		goto error;
 	}

 	if ((val != CS42L51_MK_CHIP_REV(CS42L51_CHIP_ID, CS42L51_CHIP_REV_A)) &&
 	    (val != CS42L51_MK_CHIP_REV(CS42L51_CHIP_ID, CS42L51_CHIP_REV_B))) {
 		dev_err(dev, "Invalid chip id: %x\n", val);
 		ret = -ENODEV;
 		goto error;
 	}
 	dev_info(dev, "Cirrus Logic CS42L51, Revision: %02X\n",
 		 val & CS42L51_CHIP_REV_MASK);

 	ret =  snd_soc_register_codec(dev,
 			&soc_codec_device_cs42l51, &cs42l51_dai, 1);
 error:
 	return ret;
 }
 EXPORT_SYMBOL_GPL(cs42l51_probe);

 const struct of_device_id cs42l51_of_match[] = {
 	{ .compatible = "cirrus,cs42l51", },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, cs42l51_of_match);
 EXPORT_SYMBOL_GPL(cs42l51_of_match);

 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 MODULE_DESCRIPTION("Cirrus Logic CS42L51 ALSA SoC Codec Driver");
 MODULE_LICENSE("GPL");
	/*
	* cs42l51.c
	*
	* ASoC Driver for Cirrus Logic CS42L51 codecs
	*
	* Copyright (c) 2010 Arnaud Patard <apatard@mandriva.com>
	*
	* Based on cs4270.c - Copyright (c) Freescale Semiconductor
	*
	* 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.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* For now:
	* - Only I2C is support. Not SPI
	* - master mode NOT supported
	*/

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

	#include "cs42l51.h"

	enum master_slave_mode {
	MODE_SLAVE,
	MODE_SLAVE_AUTO,
	MODE_MASTER,
	};

	struct cs42l51_private {
	unsigned int mclk;
	unsigned int audio_mode; /* The mode (I2S or left-justified) */
	enum master_slave_mode func;
	};

	#define CS42L51_FORMATS ( \
	SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S16_BE \| \
	SNDRV_PCM_FMTBIT_S18_3LE \| SNDRV_PCM_FMTBIT_S18_3BE \| \
	SNDRV_PCM_FMTBIT_S20_3LE \| SNDRV_PCM_FMTBIT_S20_3BE \| \
	SNDRV_PCM_FMTBIT_S24_LE \| SNDRV_PCM_FMTBIT_S24_BE)

	static int cs42l51_get_chan_mix(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
	unsigned long value = snd_soc_read(codec, CS42L51_PCM_MIXER)&3;

	switch (value) {
	default:
	case 0:
	ucontrol->value.integer.value[0] = 0;
	break;
	/* same value : (L+R)/2 and (R+L)/2 */
	case 1:
	case 2:
	ucontrol->value.integer.value[0] = 1;
	break;
	case 3:
	ucontrol->value.integer.value[0] = 2;
	break;
	}

	return 0;
	}

	#define CHAN_MIX_NORMAL 0x00
	#define CHAN_MIX_BOTH 0x55
	#define CHAN_MIX_SWAP 0xFF

	static int cs42l51_set_chan_mix(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
	unsigned char val;

	switch (ucontrol->value.integer.value[0]) {
	default:
	case 0:
	val = CHAN_MIX_NORMAL;
	break;
	case 1:
	val = CHAN_MIX_BOTH;
	break;
	case 2:
	val = CHAN_MIX_SWAP;
	break;
	}

	snd_soc_write(codec, CS42L51_PCM_MIXER, val);

	return 1;
	}

	static const DECLARE_TLV_DB_SCALE(adc_pcm_tlv, -5150, 50, 0);
	static const DECLARE_TLV_DB_SCALE(tone_tlv, -1050, 150, 0);

	static const DECLARE_TLV_DB_SCALE(aout_tlv, -10200, 50, 0);

	static const DECLARE_TLV_DB_SCALE(boost_tlv, 1600, 1600, 0);
	static const char *chan_mix[] = {
	"L R",
	"L+R",
	"R L",
	};

	static SOC_ENUM_SINGLE_EXT_DECL(cs42l51_chan_mix, chan_mix);

	static const struct snd_kcontrol_new cs42l51_snd_controls[] = {
	SOC_DOUBLE_R_SX_TLV("PCM Playback Volume",
	CS42L51_PCMA_VOL, CS42L51_PCMB_VOL,
	0, 0x19, 0x7F, adc_pcm_tlv),
	SOC_DOUBLE_R("PCM Playback Switch",
	CS42L51_PCMA_VOL, CS42L51_PCMB_VOL, 7, 1, 1),
	SOC_DOUBLE_R_SX_TLV("Analog Playback Volume",
	CS42L51_AOUTA_VOL, CS42L51_AOUTB_VOL,
	0, 0x34, 0xE4, aout_tlv),
	SOC_DOUBLE_R_SX_TLV("ADC Mixer Volume",
	CS42L51_ADCA_VOL, CS42L51_ADCB_VOL,
	0, 0x19, 0x7F, adc_pcm_tlv),
	SOC_DOUBLE_R("ADC Mixer Switch",
	CS42L51_ADCA_VOL, CS42L51_ADCB_VOL, 7, 1, 1),
	SOC_SINGLE("Playback Deemphasis Switch", CS42L51_DAC_CTL, 3, 1, 0),
	SOC_SINGLE("Auto-Mute Switch", CS42L51_DAC_CTL, 2, 1, 0),
	SOC_SINGLE("Soft Ramp Switch", CS42L51_DAC_CTL, 1, 1, 0),
	SOC_SINGLE("Zero Cross Switch", CS42L51_DAC_CTL, 0, 0, 0),
	SOC_DOUBLE_TLV("Mic Boost Volume",
	CS42L51_MIC_CTL, 0, 1, 1, 0, boost_tlv),
	SOC_SINGLE_TLV("Bass Volume", CS42L51_TONE_CTL, 0, 0xf, 1, tone_tlv),
	SOC_SINGLE_TLV("Treble Volume", CS42L51_TONE_CTL, 4, 0xf, 1, tone_tlv),
	SOC_ENUM_EXT("PCM channel mixer",
	cs42l51_chan_mix,
	cs42l51_get_chan_mix, cs42l51_set_chan_mix),
	};

	/*
	* to power down, one must:
	* 1.) Enable the PDN bit
	* 2.) enable power-down for the select channels
	* 3.) disable the PDN bit.
	*/
	static int cs42l51_pdn_event(struct snd_soc_dapm_widget *w,
	struct snd_kcontrol *kcontrol, int event)
	{
	switch (event) {
	case SND_SOC_DAPM_PRE_PMD:
	snd_soc_update_bits(w->codec, CS42L51_POWER_CTL1,
	CS42L51_POWER_CTL1_PDN,
	CS42L51_POWER_CTL1_PDN);
	break;
	default:
	case SND_SOC_DAPM_POST_PMD:
	snd_soc_update_bits(w->codec, CS42L51_POWER_CTL1,
	CS42L51_POWER_CTL1_PDN, 0);
	break;
	}

	return 0;
	}

	static const char *cs42l51_dac_names[] = {"Direct PCM",
	"DSP PCM", "ADC"};
	static SOC_ENUM_SINGLE_DECL(cs42l51_dac_mux_enum,
	CS42L51_DAC_CTL, 6, cs42l51_dac_names);
	static const struct snd_kcontrol_new cs42l51_dac_mux_controls =
	SOC_DAPM_ENUM("Route", cs42l51_dac_mux_enum);

	static const char *cs42l51_adcl_names[] = {"AIN1 Left", "AIN2 Left",
	"MIC Left", "MIC+preamp Left"};
	static SOC_ENUM_SINGLE_DECL(cs42l51_adcl_mux_enum,
	CS42L51_ADC_INPUT, 4, cs42l51_adcl_names);
	static const struct snd_kcontrol_new cs42l51_adcl_mux_controls =
	SOC_DAPM_ENUM("Route", cs42l51_adcl_mux_enum);

	static const char *cs42l51_adcr_names[] = {"AIN1 Right", "AIN2 Right",
	"MIC Right", "MIC+preamp Right"};
	static SOC_ENUM_SINGLE_DECL(cs42l51_adcr_mux_enum,
	CS42L51_ADC_INPUT, 6, cs42l51_adcr_names);
	static const struct snd_kcontrol_new cs42l51_adcr_mux_controls =
	SOC_DAPM_ENUM("Route", cs42l51_adcr_mux_enum);

	static const struct snd_soc_dapm_widget cs42l51_dapm_widgets[] = {
	SND_SOC_DAPM_MICBIAS("Mic Bias", CS42L51_MIC_POWER_CTL, 1, 1),
	SND_SOC_DAPM_PGA_E("Left PGA", CS42L51_POWER_CTL1, 3, 1, NULL, 0,
	cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),
	SND_SOC_DAPM_PGA_E("Right PGA", CS42L51_POWER_CTL1, 4, 1, NULL, 0,
	cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),
	SND_SOC_DAPM_ADC_E("Left ADC", "Left HiFi Capture",
	CS42L51_POWER_CTL1, 1, 1,
	cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),
	SND_SOC_DAPM_ADC_E("Right ADC", "Right HiFi Capture",
	CS42L51_POWER_CTL1, 2, 1,
	cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),
	SND_SOC_DAPM_DAC_E("Left DAC", "Left HiFi Playback",
	CS42L51_POWER_CTL1, 5, 1,
	cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),
	SND_SOC_DAPM_DAC_E("Right DAC", "Right HiFi Playback",
	CS42L51_POWER_CTL1, 6, 1,
	cs42l51_pdn_event, SND_SOC_DAPM_PRE_POST_PMD),

	/* analog/mic */
	SND_SOC_DAPM_INPUT("AIN1L"),
	SND_SOC_DAPM_INPUT("AIN1R"),
	SND_SOC_DAPM_INPUT("AIN2L"),
	SND_SOC_DAPM_INPUT("AIN2R"),
	SND_SOC_DAPM_INPUT("MICL"),
	SND_SOC_DAPM_INPUT("MICR"),

	SND_SOC_DAPM_MIXER("Mic Preamp Left",
	CS42L51_MIC_POWER_CTL, 2, 1, NULL, 0),
	SND_SOC_DAPM_MIXER("Mic Preamp Right",
	CS42L51_MIC_POWER_CTL, 3, 1, NULL, 0),

	/* HP */
	SND_SOC_DAPM_OUTPUT("HPL"),
	SND_SOC_DAPM_OUTPUT("HPR"),

	/* mux */
	SND_SOC_DAPM_MUX("DAC Mux", SND_SOC_NOPM, 0, 0,
	&cs42l51_dac_mux_controls),
	SND_SOC_DAPM_MUX("PGA-ADC Mux Left", SND_SOC_NOPM, 0, 0,
	&cs42l51_adcl_mux_controls),
	SND_SOC_DAPM_MUX("PGA-ADC Mux Right", SND_SOC_NOPM, 0, 0,
	&cs42l51_adcr_mux_controls),
	};

	static const struct snd_soc_dapm_route cs42l51_routes[] = {
	{"HPL", NULL, "Left DAC"},
	{"HPR", NULL, "Right DAC"},

	{"Left ADC", NULL, "Left PGA"},
	{"Right ADC", NULL, "Right PGA"},

	{"Mic Preamp Left", NULL, "MICL"},
	{"Mic Preamp Right", NULL, "MICR"},

	{"PGA-ADC Mux Left", "AIN1 Left", "AIN1L" },
	{"PGA-ADC Mux Left", "AIN2 Left", "AIN2L" },
	{"PGA-ADC Mux Left", "MIC Left", "MICL" },
	{"PGA-ADC Mux Left", "MIC+preamp Left", "Mic Preamp Left" },
	{"PGA-ADC Mux Right", "AIN1 Right", "AIN1R" },
	{"PGA-ADC Mux Right", "AIN2 Right", "AIN2R" },
	{"PGA-ADC Mux Right", "MIC Right", "MICR" },
	{"PGA-ADC Mux Right", "MIC+preamp Right", "Mic Preamp Right" },

	{"Left PGA", NULL, "PGA-ADC Mux Left"},
	{"Right PGA", NULL, "PGA-ADC Mux Right"},
	};

	static int cs42l51_set_dai_fmt(struct snd_soc_dai *codec_dai,
	unsigned int format)
	{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct cs42l51_private *cs42l51 = snd_soc_codec_get_drvdata(codec);

	switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
	case SND_SOC_DAIFMT_LEFT_J:
	case SND_SOC_DAIFMT_RIGHT_J:
	cs42l51->audio_mode = format & SND_SOC_DAIFMT_FORMAT_MASK;
	break;
	default:
	dev_err(codec->dev, "invalid DAI format\n");
	return -EINVAL;
	}

	switch (format & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
	cs42l51->func = MODE_MASTER;
	break;
	case SND_SOC_DAIFMT_CBS_CFS:
	cs42l51->func = MODE_SLAVE_AUTO;
	break;
	default:
	dev_err(codec->dev, "Unknown master/slave configuration\n");
	return -EINVAL;
	}

	return 0;
	}

	struct cs42l51_ratios {
	unsigned int ratio;
	unsigned char speed_mode;
	unsigned char mclk;
	};

	static struct cs42l51_ratios slave_ratios[] = {
	{ 512, CS42L51_QSM_MODE, 0 }, { 768, CS42L51_QSM_MODE, 0 },
	{ 1024, CS42L51_QSM_MODE, 0 }, { 1536, CS42L51_QSM_MODE, 0 },
	{ 2048, CS42L51_QSM_MODE, 0 }, { 3072, CS42L51_QSM_MODE, 0 },
	{ 256, CS42L51_HSM_MODE, 0 }, { 384, CS42L51_HSM_MODE, 0 },
	{ 512, CS42L51_HSM_MODE, 0 }, { 768, CS42L51_HSM_MODE, 0 },
	{ 1024, CS42L51_HSM_MODE, 0 }, { 1536, CS42L51_HSM_MODE, 0 },
	{ 128, CS42L51_SSM_MODE, 0 }, { 192, CS42L51_SSM_MODE, 0 },
	{ 256, CS42L51_SSM_MODE, 0 }, { 384, CS42L51_SSM_MODE, 0 },
	{ 512, CS42L51_SSM_MODE, 0 }, { 768, CS42L51_SSM_MODE, 0 },
	{ 128, CS42L51_DSM_MODE, 0 }, { 192, CS42L51_DSM_MODE, 0 },
	{ 256, CS42L51_DSM_MODE, 0 }, { 384, CS42L51_DSM_MODE, 0 },
	};

	static struct cs42l51_ratios slave_auto_ratios[] = {
	{ 1024, CS42L51_QSM_MODE, 0 }, { 1536, CS42L51_QSM_MODE, 0 },
	{ 2048, CS42L51_QSM_MODE, 1 }, { 3072, CS42L51_QSM_MODE, 1 },
	{ 512, CS42L51_HSM_MODE, 0 }, { 768, CS42L51_HSM_MODE, 0 },
	{ 1024, CS42L51_HSM_MODE, 1 }, { 1536, CS42L51_HSM_MODE, 1 },
	{ 256, CS42L51_SSM_MODE, 0 }, { 384, CS42L51_SSM_MODE, 0 },
	{ 512, CS42L51_SSM_MODE, 1 }, { 768, CS42L51_SSM_MODE, 1 },
	{ 128, CS42L51_DSM_MODE, 0 }, { 192, CS42L51_DSM_MODE, 0 },
	{ 256, CS42L51_DSM_MODE, 1 }, { 384, CS42L51_DSM_MODE, 1 },
	};

	static int cs42l51_set_dai_sysclk(struct snd_soc_dai *codec_dai,
	int clk_id, unsigned int freq, int dir)
	{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct cs42l51_private *cs42l51 = snd_soc_codec_get_drvdata(codec);

	cs42l51->mclk = freq;
	return 0;
	}

	static int cs42l51_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 cs42l51_private *cs42l51 = snd_soc_codec_get_drvdata(codec);
	int ret;
	unsigned int i;
	unsigned int rate;
	unsigned int ratio;
	struct cs42l51_ratios *ratios = NULL;
	int nr_ratios = 0;
	int intf_ctl, power_ctl, fmt;

	switch (cs42l51->func) {
	case MODE_MASTER:
	return -EINVAL;
	case MODE_SLAVE:
	ratios = slave_ratios;
	nr_ratios = ARRAY_SIZE(slave_ratios);
	break;
	case MODE_SLAVE_AUTO:
	ratios = slave_auto_ratios;
	nr_ratios = ARRAY_SIZE(slave_auto_ratios);
	break;
	}

	/* Figure out which MCLK/LRCK ratio to use */
	rate = params_rate(params); /* Sampling rate, in Hz */
	ratio = cs42l51->mclk / rate; /* MCLK/LRCK ratio */
	for (i = 0; i < nr_ratios; i++) {
	if (ratios[i].ratio == ratio)
	break;
	}

	if (i == nr_ratios) {
	/* We did not find a matching ratio */
	dev_err(codec->dev, "could not find matching ratio\n");
	return -EINVAL;
	}

	intf_ctl = snd_soc_read(codec, CS42L51_INTF_CTL);
	power_ctl = snd_soc_read(codec, CS42L51_MIC_POWER_CTL);

	intf_ctl &= ~(CS42L51_INTF_CTL_MASTER \| CS42L51_INTF_CTL_ADC_I2S
	\| CS42L51_INTF_CTL_DAC_FORMAT(7));
	power_ctl &= ~(CS42L51_MIC_POWER_CTL_SPEED(3)
	\| CS42L51_MIC_POWER_CTL_MCLK_DIV2);

	switch (cs42l51->func) {
	case MODE_MASTER:
	intf_ctl \|= CS42L51_INTF_CTL_MASTER;
	power_ctl \|= CS42L51_MIC_POWER_CTL_SPEED(ratios[i].speed_mode);
	break;
	case MODE_SLAVE:
	power_ctl \|= CS42L51_MIC_POWER_CTL_SPEED(ratios[i].speed_mode);
	break;
	case MODE_SLAVE_AUTO:
	power_ctl \|= CS42L51_MIC_POWER_CTL_AUTO;
	break;
	}

	switch (cs42l51->audio_mode) {
	case SND_SOC_DAIFMT_I2S:
	intf_ctl \|= CS42L51_INTF_CTL_ADC_I2S;
	intf_ctl \|= CS42L51_INTF_CTL_DAC_FORMAT(CS42L51_DAC_DIF_I2S);
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	intf_ctl \|= CS42L51_INTF_CTL_DAC_FORMAT(CS42L51_DAC_DIF_LJ24);
	break;
	case SND_SOC_DAIFMT_RIGHT_J:
	switch (params_width(params)) {
	case 16:
	fmt = CS42L51_DAC_DIF_RJ16;
	break;
	case 18:
	fmt = CS42L51_DAC_DIF_RJ18;
	break;
	case 20:
	fmt = CS42L51_DAC_DIF_RJ20;
	break;
	case 24:
	fmt = CS42L51_DAC_DIF_RJ24;
	break;
	default:
	dev_err(codec->dev, "unknown format\n");
	return -EINVAL;
	}
	intf_ctl \|= CS42L51_INTF_CTL_DAC_FORMAT(fmt);
	break;
	default:
	dev_err(codec->dev, "unknown format\n");
	return -EINVAL;
	}

	if (ratios[i].mclk)
	power_ctl \|= CS42L51_MIC_POWER_CTL_MCLK_DIV2;

	ret = snd_soc_write(codec, CS42L51_INTF_CTL, intf_ctl);
	if (ret < 0)
	return ret;

	ret = snd_soc_write(codec, CS42L51_MIC_POWER_CTL, power_ctl);
	if (ret < 0)
	return ret;

	return 0;
	}

	static int cs42l51_dai_mute(struct snd_soc_dai *dai, int mute)
	{
	struct snd_soc_codec *codec = dai->codec;
	int reg;
	int mask = CS42L51_DAC_OUT_CTL_DACA_MUTE\|CS42L51_DAC_OUT_CTL_DACB_MUTE;

	reg = snd_soc_read(codec, CS42L51_DAC_OUT_CTL);

	if (mute)
	reg \|= mask;
	else
	reg &= ~mask;

	return snd_soc_write(codec, CS42L51_DAC_OUT_CTL, reg);
	}

	static const struct snd_soc_dai_ops cs42l51_dai_ops = {
	.hw_params = cs42l51_hw_params,
	.set_sysclk = cs42l51_set_dai_sysclk,
	.set_fmt = cs42l51_set_dai_fmt,
	.digital_mute = cs42l51_dai_mute,
	};

	static struct snd_soc_dai_driver cs42l51_dai = {
	.name = "cs42l51-hifi",
	.playback = {
	.stream_name = "Playback",
	.channels_min = 1,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_96000,
	.formats = CS42L51_FORMATS,
	},
	.capture = {
	.stream_name = "Capture",
	.channels_min = 1,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_96000,
	.formats = CS42L51_FORMATS,
	},
	.ops = &cs42l51_dai_ops,
	};

	static int cs42l51_codec_probe(struct snd_soc_codec *codec)
	{
	int ret, reg;

	/*
	* DAC configuration
	* - Use signal processor
	* - auto mute
	* - vol changes immediate
	* - no de-emphasize
	*/
	reg = CS42L51_DAC_CTL_DATA_SEL(1)
	\| CS42L51_DAC_CTL_AMUTE \| CS42L51_DAC_CTL_DACSZ(0);
	ret = snd_soc_write(codec, CS42L51_DAC_CTL, reg);
	if (ret < 0)
	return ret;

	return 0;
	}

	static struct snd_soc_codec_driver soc_codec_device_cs42l51 = {
	.probe = cs42l51_codec_probe,

	.controls = cs42l51_snd_controls,
	.num_controls = ARRAY_SIZE(cs42l51_snd_controls),
	.dapm_widgets = cs42l51_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(cs42l51_dapm_widgets),
	.dapm_routes = cs42l51_routes,
	.num_dapm_routes = ARRAY_SIZE(cs42l51_routes),
	};

	const struct regmap_config cs42l51_regmap = {
	.max_register = CS42L51_CHARGE_FREQ,
	.cache_type = REGCACHE_RBTREE,
	};
	EXPORT_SYMBOL_GPL(cs42l51_regmap);

	int cs42l51_probe(struct device dev, struct regmap regmap)
	{
	struct cs42l51_private *cs42l51;
	unsigned int val;
	int ret;

	if (IS_ERR(regmap))
	return PTR_ERR(regmap);

	cs42l51 = devm_kzalloc(dev, sizeof(struct cs42l51_private),
	GFP_KERNEL);
	if (!cs42l51)
	return -ENOMEM;

	dev_set_drvdata(dev, cs42l51);

	/* Verify that we have a CS42L51 */
	ret = regmap_read(regmap, CS42L51_CHIP_REV_ID, &val);
	if (ret < 0) {
	dev_err(dev, "failed to read I2C\n");
	goto error;
	}

	if ((val != CS42L51_MK_CHIP_REV(CS42L51_CHIP_ID, CS42L51_CHIP_REV_A)) &&
	(val != CS42L51_MK_CHIP_REV(CS42L51_CHIP_ID, CS42L51_CHIP_REV_B))) {
	dev_err(dev, "Invalid chip id: %x\n", val);
	ret = -ENODEV;
	goto error;
	}
	dev_info(dev, "Cirrus Logic CS42L51, Revision: %02X\n",
	val & CS42L51_CHIP_REV_MASK);

	ret = snd_soc_register_codec(dev,
	&soc_codec_device_cs42l51, &cs42l51_dai, 1);
	error:
	return ret;
	}
	EXPORT_SYMBOL_GPL(cs42l51_probe);

	const struct of_device_id cs42l51_of_match[] = {
	{ .compatible = "cirrus,cs42l51", },
	{ }
	};
	MODULE_DEVICE_TABLE(of, cs42l51_of_match);
	EXPORT_SYMBOL_GPL(cs42l51_of_match);

	MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
	MODULE_DESCRIPTION("Cirrus Logic CS42L51 ALSA SoC Codec Driver");
	MODULE_LICENSE("GPL");