sound/soc/codecs/cs35l32.c - linux - Git at Google

 /*
  * cs35l32.c -- CS35L32 ALSA SoC audio driver
  *
  * Copyright 2014 CirrusLogic, Inc.
  *
  * Author: Brian Austin <brian.austin@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/init.h>
 #include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/gpio.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
 #include <linux/gpio/consumer.h>
 #include <linux/of_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 <dt-bindings/sound/cs35l32.h>

 #include "cs35l32.h"

 #define CS35L32_NUM_SUPPLIES 2
 static const char *const cs35l32_supply_names[CS35L32_NUM_SUPPLIES] = {
 	"VA",
 	"VP",
 };

 struct  cs35l32_private {
 	struct regmap *regmap;
 	struct snd_soc_codec *codec;
 	struct regulator_bulk_data supplies[CS35L32_NUM_SUPPLIES];
 	struct cs35l32_platform_data pdata;
 	struct gpio_desc *reset_gpio;
 };

 static const struct reg_default cs35l32_reg_defaults[] = {

 	{ 0x06, 0x04 }, /* Power Ctl 1 */
 	{ 0x07, 0xE8 }, /* Power Ctl 2 */
 	{ 0x08, 0x40 }, /* Clock Ctl */
 	{ 0x09, 0x20 }, /* Low Battery Threshold */
 	{ 0x0A, 0x00 }, /* Voltage Monitor [RO] */
 	{ 0x0B, 0x40 }, /* Conv Peak Curr Protection CTL */
 	{ 0x0C, 0x07 }, /* IMON Scaling */
 	{ 0x0D, 0x03 }, /* Audio/LED Pwr Manager */
 	{ 0x0F, 0x20 }, /* Serial Port Control */
 	{ 0x10, 0x14 }, /* Class D Amp CTL */
 	{ 0x11, 0x00 }, /* Protection Release CTL */
 	{ 0x12, 0xFF }, /* Interrupt Mask 1 */
 	{ 0x13, 0xFF }, /* Interrupt Mask 2 */
 	{ 0x14, 0xFF }, /* Interrupt Mask 3 */
 	{ 0x19, 0x00 }, /* LED Flash Mode Current */
 	{ 0x1A, 0x00 }, /* LED Movie Mode Current */
 	{ 0x1B, 0x20 }, /* LED Flash Timer */
 	{ 0x1C, 0x00 }, /* LED Flash Inhibit Current */
 };

 static bool cs35l32_readable_register(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case CS35L32_DEVID_AB:
 	case CS35L32_DEVID_CD:
 	case CS35L32_DEVID_E:
 	case CS35L32_FAB_ID:
 	case CS35L32_REV_ID:
 	case CS35L32_PWRCTL1:
 	case CS35L32_PWRCTL2:
 	case CS35L32_CLK_CTL:
 	case CS35L32_BATT_THRESHOLD:
 	case CS35L32_VMON:
 	case CS35L32_BST_CPCP_CTL:
 	case CS35L32_IMON_SCALING:
 	case CS35L32_AUDIO_LED_MNGR:
 	case CS35L32_ADSP_CTL:
 	case CS35L32_CLASSD_CTL:
 	case CS35L32_PROTECT_CTL:
 	case CS35L32_INT_MASK_1:
 	case CS35L32_INT_MASK_2:
 	case CS35L32_INT_MASK_3:
 	case CS35L32_INT_STATUS_1:
 	case CS35L32_INT_STATUS_2:
 	case CS35L32_INT_STATUS_3:
 	case CS35L32_LED_STATUS:
 	case CS35L32_FLASH_MODE:
 	case CS35L32_MOVIE_MODE:
 	case CS35L32_FLASH_TIMER:
 	case CS35L32_FLASH_INHIBIT:
 		return true;
 	default:
 		return false;
 	}
 }

 static bool cs35l32_volatile_register(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case CS35L32_DEVID_AB:
 	case CS35L32_DEVID_CD:
 	case CS35L32_DEVID_E:
 	case CS35L32_FAB_ID:
 	case CS35L32_REV_ID:
 	case CS35L32_INT_STATUS_1:
 	case CS35L32_INT_STATUS_2:
 	case CS35L32_INT_STATUS_3:
 	case CS35L32_LED_STATUS:
 		return true;
 	default:
 		return false;
 	}
 }

 static bool cs35l32_precious_register(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case CS35L32_INT_STATUS_1:
 	case CS35L32_INT_STATUS_2:
 	case CS35L32_INT_STATUS_3:
 	case CS35L32_LED_STATUS:
 		return true;
 	default:
 		return false;
 	}
 }

 static DECLARE_TLV_DB_SCALE(classd_ctl_tlv, 900, 300, 0);

 static const struct snd_kcontrol_new imon_ctl =
 	SOC_DAPM_SINGLE("Switch", CS35L32_PWRCTL2, 6, 1, 1);

 static const struct snd_kcontrol_new vmon_ctl =
 	SOC_DAPM_SINGLE("Switch", CS35L32_PWRCTL2, 7, 1, 1);

 static const struct snd_kcontrol_new vpmon_ctl =
 	SOC_DAPM_SINGLE("Switch", CS35L32_PWRCTL2, 5, 1, 1);

 static const struct snd_kcontrol_new cs35l32_snd_controls[] = {
 	SOC_SINGLE_TLV("Speaker Volume", CS35L32_CLASSD_CTL,
 		       3, 0x04, 1, classd_ctl_tlv),
 	SOC_SINGLE("Zero Cross Switch", CS35L32_CLASSD_CTL, 2, 1, 0),
 	SOC_SINGLE("Gain Manager Switch", CS35L32_AUDIO_LED_MNGR, 3, 1, 0),
 };

 static const struct snd_soc_dapm_widget cs35l32_dapm_widgets[] = {

 	SND_SOC_DAPM_SUPPLY("BOOST", CS35L32_PWRCTL1, 2, 1, NULL, 0),
 	SND_SOC_DAPM_OUT_DRV("Speaker", CS35L32_PWRCTL1, 7, 1, NULL, 0),

 	SND_SOC_DAPM_AIF_OUT("SDOUT", NULL, 0, CS35L32_PWRCTL2, 3, 1),

 	SND_SOC_DAPM_INPUT("VP"),
 	SND_SOC_DAPM_INPUT("ISENSE"),
 	SND_SOC_DAPM_INPUT("VSENSE"),

 	SND_SOC_DAPM_SWITCH("VMON ADC", CS35L32_PWRCTL2, 7, 1, &vmon_ctl),
 	SND_SOC_DAPM_SWITCH("IMON ADC", CS35L32_PWRCTL2, 6, 1, &imon_ctl),
 	SND_SOC_DAPM_SWITCH("VPMON ADC", CS35L32_PWRCTL2, 5, 1, &vpmon_ctl),
 };

 static const struct snd_soc_dapm_route cs35l32_audio_map[] = {

 	{"Speaker", NULL, "BOOST"},

 	{"VMON ADC", NULL, "VSENSE"},
 	{"IMON ADC", NULL, "ISENSE"},
 	{"VPMON ADC", NULL, "VP"},

 	{"SDOUT", "Switch", "VMON ADC"},
 	{"SDOUT",  "Switch", "IMON ADC"},
 	{"SDOUT", "Switch", "VPMON ADC"},

 	{"Capture", NULL, "SDOUT"},
 };

 static int cs35l32_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
 {
 	struct snd_soc_codec *codec = codec_dai->codec;

 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBM_CFM:
 		snd_soc_update_bits(codec, CS35L32_ADSP_CTL,
 				    CS35L32_ADSP_MASTER_MASK,
 				CS35L32_ADSP_MASTER_MASK);
 		break;
 	case SND_SOC_DAIFMT_CBS_CFS:
 		snd_soc_update_bits(codec, CS35L32_ADSP_CTL,
 				    CS35L32_ADSP_MASTER_MASK, 0);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int cs35l32_set_tristate(struct snd_soc_dai *dai, int tristate)
 {
 	struct snd_soc_codec *codec = dai->codec;

 	return snd_soc_update_bits(codec, CS35L32_PWRCTL2,
 					CS35L32_SDOUT_3ST, tristate << 3);
 }

 static const struct snd_soc_dai_ops cs35l32_ops = {
 	.set_fmt = cs35l32_set_dai_fmt,
 	.set_tristate = cs35l32_set_tristate,
 };

 static struct snd_soc_dai_driver cs35l32_dai[] = {
 	{
 		.name = "cs35l32-monitor",
 		.id = 0,
 		.capture = {
 			.stream_name = "Capture",
 			.channels_min = 2,
 			.channels_max = 2,
 			.rates = CS35L32_RATES,
 			.formats = CS35L32_FORMATS,
 		},
 		.ops = &cs35l32_ops,
 		.symmetric_rates = 1,
 	}
 };

 static int cs35l32_codec_set_sysclk(struct snd_soc_codec *codec,
 			      int clk_id, int source, unsigned int freq, int dir)
 {
 	unsigned int val;

 	switch (freq) {
 	case 6000000:
 		val = CS35L32_MCLK_RATIO;
 		break;
 	case 12000000:
 		val = CS35L32_MCLK_DIV2_MASK | CS35L32_MCLK_RATIO;
 		break;
 	case 6144000:
 		val = 0;
 		break;
 	case 12288000:
 		val = CS35L32_MCLK_DIV2_MASK;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return snd_soc_update_bits(codec, CS35L32_CLK_CTL,
 			CS35L32_MCLK_DIV2_MASK | CS35L32_MCLK_RATIO_MASK, val);
 }

 static const struct snd_soc_codec_driver soc_codec_dev_cs35l32 = {
 	.set_sysclk = cs35l32_codec_set_sysclk,

 	.dapm_widgets = cs35l32_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(cs35l32_dapm_widgets),
 	.dapm_routes = cs35l32_audio_map,
 	.num_dapm_routes = ARRAY_SIZE(cs35l32_audio_map),

 	.controls = cs35l32_snd_controls,
 	.num_controls = ARRAY_SIZE(cs35l32_snd_controls),
 };

 /* Current and threshold powerup sequence Pg37 in datasheet */
 static const struct reg_default cs35l32_monitor_patch[] = {

 	{ 0x00, 0x99 },
 	{ 0x48, 0x17 },
 	{ 0x49, 0x56 },
 	{ 0x43, 0x01 },
 	{ 0x3B, 0x62 },
 	{ 0x3C, 0x80 },
 	{ 0x00, 0x00 },
 };

 static const struct regmap_config cs35l32_regmap = {
 	.reg_bits = 8,
 	.val_bits = 8,

 	.max_register = CS35L32_MAX_REGISTER,
 	.reg_defaults = cs35l32_reg_defaults,
 	.num_reg_defaults = ARRAY_SIZE(cs35l32_reg_defaults),
 	.volatile_reg = cs35l32_volatile_register,
 	.readable_reg = cs35l32_readable_register,
 	.precious_reg = cs35l32_precious_register,
 	.cache_type = REGCACHE_RBTREE,
 };

 static int cs35l32_handle_of_data(struct i2c_client *i2c_client,
 				    struct cs35l32_platform_data *pdata)
 {
 	struct device_node *np = i2c_client->dev.of_node;
 	unsigned int val;

 	if (of_property_read_u32(np, "cirrus,sdout-share", &val) >= 0)
 		pdata->sdout_share = val;

 	of_property_read_u32(np, "cirrus,boost-manager", &val);
 	switch (val) {
 	case CS35L32_BOOST_MGR_AUTO:
 	case CS35L32_BOOST_MGR_AUTO_AUDIO:
 	case CS35L32_BOOST_MGR_BYPASS:
 	case CS35L32_BOOST_MGR_FIXED:
 		pdata->boost_mng = val;
 		break;
 	default:
 		dev_err(&i2c_client->dev,
 			"Wrong cirrus,boost-manager DT value %d\n", val);
 		pdata->boost_mng = CS35L32_BOOST_MGR_BYPASS;
 	}

 	of_property_read_u32(np, "cirrus,sdout-datacfg", &val);
 	switch (val) {
 	case CS35L32_DATA_CFG_LR_VP:
 	case CS35L32_DATA_CFG_LR_STAT:
 	case CS35L32_DATA_CFG_LR:
 	case CS35L32_DATA_CFG_LR_VPSTAT:
 		pdata->sdout_datacfg = val;
 		break;
 	default:
 		dev_err(&i2c_client->dev,
 			"Wrong cirrus,sdout-datacfg DT value %d\n", val);
 		pdata->sdout_datacfg = CS35L32_DATA_CFG_LR;
 	}

 	of_property_read_u32(np, "cirrus,battery-threshold", &val);
 	switch (val) {
 	case CS35L32_BATT_THRESH_3_1V:
 	case CS35L32_BATT_THRESH_3_2V:
 	case CS35L32_BATT_THRESH_3_3V:
 	case CS35L32_BATT_THRESH_3_4V:
 		pdata->batt_thresh = val;
 		break;
 	default:
 		dev_err(&i2c_client->dev,
 			"Wrong cirrus,battery-threshold DT value %d\n", val);
 		pdata->batt_thresh = CS35L32_BATT_THRESH_3_3V;
 	}

 	of_property_read_u32(np, "cirrus,battery-recovery", &val);
 	switch (val) {
 	case CS35L32_BATT_RECOV_3_1V:
 	case CS35L32_BATT_RECOV_3_2V:
 	case CS35L32_BATT_RECOV_3_3V:
 	case CS35L32_BATT_RECOV_3_4V:
 	case CS35L32_BATT_RECOV_3_5V:
 	case CS35L32_BATT_RECOV_3_6V:
 		pdata->batt_recov = val;
 		break;
 	default:
 		dev_err(&i2c_client->dev,
 			"Wrong cirrus,battery-recovery DT value %d\n", val);
 		pdata->batt_recov = CS35L32_BATT_RECOV_3_4V;
 	}

 	return 0;
 }

 static int cs35l32_i2c_probe(struct i2c_client *i2c_client,
 				       const struct i2c_device_id *id)
 {
 	struct cs35l32_private *cs35l32;
 	struct cs35l32_platform_data *pdata =
 		dev_get_platdata(&i2c_client->dev);
 	int ret, i;
 	unsigned int devid = 0;
 	unsigned int reg;


 	cs35l32 = devm_kzalloc(&i2c_client->dev, sizeof(struct cs35l32_private),
 			       GFP_KERNEL);
 	if (!cs35l32) {
 		dev_err(&i2c_client->dev, "could not allocate codec\n");
 		return -ENOMEM;
 	}

 	i2c_set_clientdata(i2c_client, cs35l32);

 	cs35l32->regmap = devm_regmap_init_i2c(i2c_client, &cs35l32_regmap);
 	if (IS_ERR(cs35l32->regmap)) {
 		ret = PTR_ERR(cs35l32->regmap);
 		dev_err(&i2c_client->dev, "regmap_init() failed: %d\n", ret);
 		return ret;
 	}

 	if (pdata) {
 		cs35l32->pdata = *pdata;
 	} else {
 		pdata = devm_kzalloc(&i2c_client->dev,
 				     sizeof(struct cs35l32_platform_data),
 				GFP_KERNEL);
 		if (!pdata) {
 			dev_err(&i2c_client->dev, "could not allocate pdata\n");
 			return -ENOMEM;
 		}
 		if (i2c_client->dev.of_node) {
 			ret = cs35l32_handle_of_data(i2c_client,
 						     &cs35l32->pdata);
 			if (ret != 0)
 				return ret;
 		}
 	}

 	for (i = 0; i < ARRAY_SIZE(cs35l32->supplies); i++)
 		cs35l32->supplies[i].supply = cs35l32_supply_names[i];

 	ret = devm_regulator_bulk_get(&i2c_client->dev,
 				      ARRAY_SIZE(cs35l32->supplies),
 				      cs35l32->supplies);
 	if (ret != 0) {
 		dev_err(&i2c_client->dev,
 			"Failed to request supplies: %d\n", ret);
 		return ret;
 	}

 	ret = regulator_bulk_enable(ARRAY_SIZE(cs35l32->supplies),
 				    cs35l32->supplies);
 	if (ret != 0) {
 		dev_err(&i2c_client->dev,
 			"Failed to enable supplies: %d\n", ret);
 		return ret;
 	}

 	/* Reset the Device */
 	cs35l32->reset_gpio = devm_gpiod_get_optional(&i2c_client->dev,
 		"reset", GPIOD_OUT_LOW);
 	if (IS_ERR(cs35l32->reset_gpio))
 		return PTR_ERR(cs35l32->reset_gpio);

 	if (cs35l32->reset_gpio)
 		gpiod_set_value_cansleep(cs35l32->reset_gpio, 1);

 	/* initialize codec */
 	ret = regmap_read(cs35l32->regmap, CS35L32_DEVID_AB, &reg);
 	devid = (reg & 0xFF) << 12;

 	ret = regmap_read(cs35l32->regmap, CS35L32_DEVID_CD, &reg);
 	devid |= (reg & 0xFF) << 4;

 	ret = regmap_read(cs35l32->regmap, CS35L32_DEVID_E, &reg);
 	devid |= (reg & 0xF0) >> 4;

 	if (devid != CS35L32_CHIP_ID) {
 		ret = -ENODEV;
 		dev_err(&i2c_client->dev,
 			"CS35L32 Device ID (%X). Expected %X\n",
 			devid, CS35L32_CHIP_ID);
 		return ret;
 	}

 	ret = regmap_read(cs35l32->regmap, CS35L32_REV_ID, &reg);
 	if (ret < 0) {
 		dev_err(&i2c_client->dev, "Get Revision ID failed\n");
 		return ret;
 	}

 	ret = regmap_register_patch(cs35l32->regmap, cs35l32_monitor_patch,
 				    ARRAY_SIZE(cs35l32_monitor_patch));
 	if (ret < 0) {
 		dev_err(&i2c_client->dev, "Failed to apply errata patch\n");
 		return ret;
 	}

 	dev_info(&i2c_client->dev,
 		 "Cirrus Logic CS35L32, Revision: %02X\n", reg & 0xFF);

 	/* Setup VBOOST Management */
 	if (cs35l32->pdata.boost_mng)
 		regmap_update_bits(cs35l32->regmap, CS35L32_AUDIO_LED_MNGR,
 				   CS35L32_BOOST_MASK,
 				cs35l32->pdata.boost_mng);

 	/* Setup ADSP Format Config */
 	if (cs35l32->pdata.sdout_share)
 		regmap_update_bits(cs35l32->regmap, CS35L32_ADSP_CTL,
 				    CS35L32_ADSP_SHARE_MASK,
 				cs35l32->pdata.sdout_share << 3);

 	/* Setup ADSP Data Configuration */
 	if (cs35l32->pdata.sdout_datacfg)
 		regmap_update_bits(cs35l32->regmap, CS35L32_ADSP_CTL,
 				   CS35L32_ADSP_DATACFG_MASK,
 				cs35l32->pdata.sdout_datacfg << 4);

 	/* Setup Low Battery Recovery  */
 	if (cs35l32->pdata.batt_recov)
 		regmap_update_bits(cs35l32->regmap, CS35L32_BATT_THRESHOLD,
 				   CS35L32_BATT_REC_MASK,
 				cs35l32->pdata.batt_recov << 1);

 	/* Setup Low Battery Threshold */
 	if (cs35l32->pdata.batt_thresh)
 		regmap_update_bits(cs35l32->regmap, CS35L32_BATT_THRESHOLD,
 				   CS35L32_BATT_THRESH_MASK,
 				cs35l32->pdata.batt_thresh << 4);

 	/* Power down the AMP */
 	regmap_update_bits(cs35l32->regmap, CS35L32_PWRCTL1, CS35L32_PDN_AMP,
 			    CS35L32_PDN_AMP);

 	/* Clear MCLK Error Bit since we don't have the clock yet */
 	ret = regmap_read(cs35l32->regmap, CS35L32_INT_STATUS_1, &reg);

 	ret =  snd_soc_register_codec(&i2c_client->dev,
 			&soc_codec_dev_cs35l32, cs35l32_dai,
 			ARRAY_SIZE(cs35l32_dai));
 	if (ret < 0)
 		goto err_disable;

 	return 0;

 err_disable:
 	regulator_bulk_disable(ARRAY_SIZE(cs35l32->supplies),
 			       cs35l32->supplies);
 	return ret;
 }

 static int cs35l32_i2c_remove(struct i2c_client *i2c_client)
 {
 	struct cs35l32_private *cs35l32 = i2c_get_clientdata(i2c_client);

 	snd_soc_unregister_codec(&i2c_client->dev);

 	/* Hold down reset */
 	if (cs35l32->reset_gpio)
 		gpiod_set_value_cansleep(cs35l32->reset_gpio, 0);

 	return 0;
 }

 #ifdef CONFIG_PM
 static int cs35l32_runtime_suspend(struct device *dev)
 {
 	struct cs35l32_private *cs35l32 = dev_get_drvdata(dev);

 	regcache_cache_only(cs35l32->regmap, true);
 	regcache_mark_dirty(cs35l32->regmap);

 	/* Hold down reset */
 	if (cs35l32->reset_gpio)
 		gpiod_set_value_cansleep(cs35l32->reset_gpio, 0);

 	/* remove power */
 	regulator_bulk_disable(ARRAY_SIZE(cs35l32->supplies),
 			       cs35l32->supplies);

 	return 0;
 }

 static int cs35l32_runtime_resume(struct device *dev)
 {
 	struct cs35l32_private *cs35l32 = dev_get_drvdata(dev);
 	int ret;

 	/* Enable power */
 	ret = regulator_bulk_enable(ARRAY_SIZE(cs35l32->supplies),
 				    cs35l32->supplies);
 	if (ret != 0) {
 		dev_err(dev, "Failed to enable supplies: %d\n",
 			ret);
 		return ret;
 	}

 	if (cs35l32->reset_gpio)
 		gpiod_set_value_cansleep(cs35l32->reset_gpio, 1);

 	regcache_cache_only(cs35l32->regmap, false);
 	regcache_sync(cs35l32->regmap);

 	return 0;
 }
 #endif

 static const struct dev_pm_ops cs35l32_runtime_pm = {
 	SET_RUNTIME_PM_OPS(cs35l32_runtime_suspend, cs35l32_runtime_resume,
 			   NULL)
 };

 static const struct of_device_id cs35l32_of_match[] = {
 	{ .compatible = "cirrus,cs35l32", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, cs35l32_of_match);


 static const struct i2c_device_id cs35l32_id[] = {
 	{"cs35l32", 0},
 	{}
 };

 MODULE_DEVICE_TABLE(i2c, cs35l32_id);

 static struct i2c_driver cs35l32_i2c_driver = {
 	.driver = {
 		   .name = "cs35l32",
 		   .owner = THIS_MODULE,
 		   .pm = &cs35l32_runtime_pm,
 		   .of_match_table = cs35l32_of_match,
 		   },
 	.id_table = cs35l32_id,
 	.probe = cs35l32_i2c_probe,
 	.remove = cs35l32_i2c_remove,
 };

 module_i2c_driver(cs35l32_i2c_driver);

 MODULE_DESCRIPTION("ASoC CS35L32 driver");
 MODULE_AUTHOR("Brian Austin, Cirrus Logic Inc, <brian.austin@cirrus.com>");
 MODULE_LICENSE("GPL");
	/*
	* cs35l32.c -- CS35L32 ALSA SoC audio driver
	*
	* Copyright 2014 CirrusLogic, Inc.
	*
	* Author: Brian Austin <brian.austin@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/init.h>
	#include <linux/delay.h>
	#include <linux/i2c.h>
	#include <linux/gpio.h>
	#include <linux/regmap.h>
	#include <linux/slab.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/consumer.h>
	#include <linux/gpio/consumer.h>
	#include <linux/of_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 <dt-bindings/sound/cs35l32.h>

	#include "cs35l32.h"

	#define CS35L32_NUM_SUPPLIES 2
	static const char *const cs35l32_supply_names[CS35L32_NUM_SUPPLIES] = {
	"VA",
	"VP",
	};

	struct cs35l32_private {
	struct regmap *regmap;
	struct snd_soc_codec *codec;
	struct regulator_bulk_data supplies[CS35L32_NUM_SUPPLIES];
	struct cs35l32_platform_data pdata;
	struct gpio_desc *reset_gpio;
	};

	static const struct reg_default cs35l32_reg_defaults[] = {

	{ 0x06, 0x04 }, /* Power Ctl 1 */
	{ 0x07, 0xE8 }, /* Power Ctl 2 */
	{ 0x08, 0x40 }, /* Clock Ctl */
	{ 0x09, 0x20 }, /* Low Battery Threshold */
	{ 0x0A, 0x00 }, /* Voltage Monitor [RO] */
	{ 0x0B, 0x40 }, /* Conv Peak Curr Protection CTL */
	{ 0x0C, 0x07 }, /* IMON Scaling */
	{ 0x0D, 0x03 }, /* Audio/LED Pwr Manager */
	{ 0x0F, 0x20 }, /* Serial Port Control */
	{ 0x10, 0x14 }, /* Class D Amp CTL */
	{ 0x11, 0x00 }, /* Protection Release CTL */
	{ 0x12, 0xFF }, /* Interrupt Mask 1 */
	{ 0x13, 0xFF }, /* Interrupt Mask 2 */
	{ 0x14, 0xFF }, /* Interrupt Mask 3 */
	{ 0x19, 0x00 }, /* LED Flash Mode Current */
	{ 0x1A, 0x00 }, /* LED Movie Mode Current */
	{ 0x1B, 0x20 }, /* LED Flash Timer */
	{ 0x1C, 0x00 }, /* LED Flash Inhibit Current */
	};

	static bool cs35l32_readable_register(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case CS35L32_DEVID_AB:
	case CS35L32_DEVID_CD:
	case CS35L32_DEVID_E:
	case CS35L32_FAB_ID:
	case CS35L32_REV_ID:
	case CS35L32_PWRCTL1:
	case CS35L32_PWRCTL2:
	case CS35L32_CLK_CTL:
	case CS35L32_BATT_THRESHOLD:
	case CS35L32_VMON:
	case CS35L32_BST_CPCP_CTL:
	case CS35L32_IMON_SCALING:
	case CS35L32_AUDIO_LED_MNGR:
	case CS35L32_ADSP_CTL:
	case CS35L32_CLASSD_CTL:
	case CS35L32_PROTECT_CTL:
	case CS35L32_INT_MASK_1:
	case CS35L32_INT_MASK_2:
	case CS35L32_INT_MASK_3:
	case CS35L32_INT_STATUS_1:
	case CS35L32_INT_STATUS_2:
	case CS35L32_INT_STATUS_3:
	case CS35L32_LED_STATUS:
	case CS35L32_FLASH_MODE:
	case CS35L32_MOVIE_MODE:
	case CS35L32_FLASH_TIMER:
	case CS35L32_FLASH_INHIBIT:
	return true;
	default:
	return false;
	}
	}

	static bool cs35l32_volatile_register(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case CS35L32_DEVID_AB:
	case CS35L32_DEVID_CD:
	case CS35L32_DEVID_E:
	case CS35L32_FAB_ID:
	case CS35L32_REV_ID:
	case CS35L32_INT_STATUS_1:
	case CS35L32_INT_STATUS_2:
	case CS35L32_INT_STATUS_3:
	case CS35L32_LED_STATUS:
	return true;
	default:
	return false;
	}
	}

	static bool cs35l32_precious_register(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case CS35L32_INT_STATUS_1:
	case CS35L32_INT_STATUS_2:
	case CS35L32_INT_STATUS_3:
	case CS35L32_LED_STATUS:
	return true;
	default:
	return false;
	}
	}

	static DECLARE_TLV_DB_SCALE(classd_ctl_tlv, 900, 300, 0);

	static const struct snd_kcontrol_new imon_ctl =
	SOC_DAPM_SINGLE("Switch", CS35L32_PWRCTL2, 6, 1, 1);

	static const struct snd_kcontrol_new vmon_ctl =
	SOC_DAPM_SINGLE("Switch", CS35L32_PWRCTL2, 7, 1, 1);

	static const struct snd_kcontrol_new vpmon_ctl =
	SOC_DAPM_SINGLE("Switch", CS35L32_PWRCTL2, 5, 1, 1);

	static const struct snd_kcontrol_new cs35l32_snd_controls[] = {
	SOC_SINGLE_TLV("Speaker Volume", CS35L32_CLASSD_CTL,
	3, 0x04, 1, classd_ctl_tlv),
	SOC_SINGLE("Zero Cross Switch", CS35L32_CLASSD_CTL, 2, 1, 0),
	SOC_SINGLE("Gain Manager Switch", CS35L32_AUDIO_LED_MNGR, 3, 1, 0),
	};

	static const struct snd_soc_dapm_widget cs35l32_dapm_widgets[] = {

	SND_SOC_DAPM_SUPPLY("BOOST", CS35L32_PWRCTL1, 2, 1, NULL, 0),
	SND_SOC_DAPM_OUT_DRV("Speaker", CS35L32_PWRCTL1, 7, 1, NULL, 0),

	SND_SOC_DAPM_AIF_OUT("SDOUT", NULL, 0, CS35L32_PWRCTL2, 3, 1),

	SND_SOC_DAPM_INPUT("VP"),
	SND_SOC_DAPM_INPUT("ISENSE"),
	SND_SOC_DAPM_INPUT("VSENSE"),

	SND_SOC_DAPM_SWITCH("VMON ADC", CS35L32_PWRCTL2, 7, 1, &vmon_ctl),
	SND_SOC_DAPM_SWITCH("IMON ADC", CS35L32_PWRCTL2, 6, 1, &imon_ctl),
	SND_SOC_DAPM_SWITCH("VPMON ADC", CS35L32_PWRCTL2, 5, 1, &vpmon_ctl),
	};

	static const struct snd_soc_dapm_route cs35l32_audio_map[] = {

	{"Speaker", NULL, "BOOST"},

	{"VMON ADC", NULL, "VSENSE"},
	{"IMON ADC", NULL, "ISENSE"},
	{"VPMON ADC", NULL, "VP"},

	{"SDOUT", "Switch", "VMON ADC"},
	{"SDOUT", "Switch", "IMON ADC"},
	{"SDOUT", "Switch", "VPMON ADC"},

	{"Capture", NULL, "SDOUT"},
	};

	static int cs35l32_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
	{
	struct snd_soc_codec *codec = codec_dai->codec;

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
	snd_soc_update_bits(codec, CS35L32_ADSP_CTL,
	CS35L32_ADSP_MASTER_MASK,
	CS35L32_ADSP_MASTER_MASK);
	break;
	case SND_SOC_DAIFMT_CBS_CFS:
	snd_soc_update_bits(codec, CS35L32_ADSP_CTL,
	CS35L32_ADSP_MASTER_MASK, 0);
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int cs35l32_set_tristate(struct snd_soc_dai *dai, int tristate)
	{
	struct snd_soc_codec *codec = dai->codec;

	return snd_soc_update_bits(codec, CS35L32_PWRCTL2,
	CS35L32_SDOUT_3ST, tristate << 3);
	}

	static const struct snd_soc_dai_ops cs35l32_ops = {
	.set_fmt = cs35l32_set_dai_fmt,
	.set_tristate = cs35l32_set_tristate,
	};

	static struct snd_soc_dai_driver cs35l32_dai[] = {
	{
	.name = "cs35l32-monitor",
	.id = 0,
	.capture = {
	.stream_name = "Capture",
	.channels_min = 2,
	.channels_max = 2,
	.rates = CS35L32_RATES,
	.formats = CS35L32_FORMATS,
	},
	.ops = &cs35l32_ops,
	.symmetric_rates = 1,
	}
	};

	static int cs35l32_codec_set_sysclk(struct snd_soc_codec *codec,
	int clk_id, int source, unsigned int freq, int dir)
	{
	unsigned int val;

	switch (freq) {
	case 6000000:
	val = CS35L32_MCLK_RATIO;
	break;
	case 12000000:
	val = CS35L32_MCLK_DIV2_MASK \| CS35L32_MCLK_RATIO;
	break;
	case 6144000:
	val = 0;
	break;
	case 12288000:
	val = CS35L32_MCLK_DIV2_MASK;
	break;
	default:
	return -EINVAL;
	}

	return snd_soc_update_bits(codec, CS35L32_CLK_CTL,
	CS35L32_MCLK_DIV2_MASK \| CS35L32_MCLK_RATIO_MASK, val);
	}

	static const struct snd_soc_codec_driver soc_codec_dev_cs35l32 = {
	.set_sysclk = cs35l32_codec_set_sysclk,

	.dapm_widgets = cs35l32_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(cs35l32_dapm_widgets),
	.dapm_routes = cs35l32_audio_map,
	.num_dapm_routes = ARRAY_SIZE(cs35l32_audio_map),

	.controls = cs35l32_snd_controls,
	.num_controls = ARRAY_SIZE(cs35l32_snd_controls),
	};

	/* Current and threshold powerup sequence Pg37 in datasheet */
	static const struct reg_default cs35l32_monitor_patch[] = {

	{ 0x00, 0x99 },
	{ 0x48, 0x17 },
	{ 0x49, 0x56 },
	{ 0x43, 0x01 },
	{ 0x3B, 0x62 },
	{ 0x3C, 0x80 },
	{ 0x00, 0x00 },
	};

	static const struct regmap_config cs35l32_regmap = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = CS35L32_MAX_REGISTER,
	.reg_defaults = cs35l32_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(cs35l32_reg_defaults),
	.volatile_reg = cs35l32_volatile_register,
	.readable_reg = cs35l32_readable_register,
	.precious_reg = cs35l32_precious_register,
	.cache_type = REGCACHE_RBTREE,
	};

	static int cs35l32_handle_of_data(struct i2c_client *i2c_client,
	struct cs35l32_platform_data *pdata)
	{
	struct device_node *np = i2c_client->dev.of_node;
	unsigned int val;

	if (of_property_read_u32(np, "cirrus,sdout-share", &val) >= 0)
	pdata->sdout_share = val;

	of_property_read_u32(np, "cirrus,boost-manager", &val);
	switch (val) {
	case CS35L32_BOOST_MGR_AUTO:
	case CS35L32_BOOST_MGR_AUTO_AUDIO:
	case CS35L32_BOOST_MGR_BYPASS:
	case CS35L32_BOOST_MGR_FIXED:
	pdata->boost_mng = val;
	break;
	default:
	dev_err(&i2c_client->dev,
	"Wrong cirrus,boost-manager DT value %d\n", val);
	pdata->boost_mng = CS35L32_BOOST_MGR_BYPASS;
	}

	of_property_read_u32(np, "cirrus,sdout-datacfg", &val);
	switch (val) {
	case CS35L32_DATA_CFG_LR_VP:
	case CS35L32_DATA_CFG_LR_STAT:
	case CS35L32_DATA_CFG_LR:
	case CS35L32_DATA_CFG_LR_VPSTAT:
	pdata->sdout_datacfg = val;
	break;
	default:
	dev_err(&i2c_client->dev,
	"Wrong cirrus,sdout-datacfg DT value %d\n", val);
	pdata->sdout_datacfg = CS35L32_DATA_CFG_LR;
	}

	of_property_read_u32(np, "cirrus,battery-threshold", &val);
	switch (val) {
	case CS35L32_BATT_THRESH_3_1V:
	case CS35L32_BATT_THRESH_3_2V:
	case CS35L32_BATT_THRESH_3_3V:
	case CS35L32_BATT_THRESH_3_4V:
	pdata->batt_thresh = val;
	break;
	default:
	dev_err(&i2c_client->dev,
	"Wrong cirrus,battery-threshold DT value %d\n", val);
	pdata->batt_thresh = CS35L32_BATT_THRESH_3_3V;
	}

	of_property_read_u32(np, "cirrus,battery-recovery", &val);
	switch (val) {
	case CS35L32_BATT_RECOV_3_1V:
	case CS35L32_BATT_RECOV_3_2V:
	case CS35L32_BATT_RECOV_3_3V:
	case CS35L32_BATT_RECOV_3_4V:
	case CS35L32_BATT_RECOV_3_5V:
	case CS35L32_BATT_RECOV_3_6V:
	pdata->batt_recov = val;
	break;
	default:
	dev_err(&i2c_client->dev,
	"Wrong cirrus,battery-recovery DT value %d\n", val);
	pdata->batt_recov = CS35L32_BATT_RECOV_3_4V;
	}

	return 0;
	}

	static int cs35l32_i2c_probe(struct i2c_client *i2c_client,
	const struct i2c_device_id *id)
	{
	struct cs35l32_private *cs35l32;
	struct cs35l32_platform_data *pdata =
	dev_get_platdata(&i2c_client->dev);
	int ret, i;
	unsigned int devid = 0;
	unsigned int reg;


	cs35l32 = devm_kzalloc(&i2c_client->dev, sizeof(struct cs35l32_private),
	GFP_KERNEL);
	if (!cs35l32) {
	dev_err(&i2c_client->dev, "could not allocate codec\n");
	return -ENOMEM;
	}

	i2c_set_clientdata(i2c_client, cs35l32);

	cs35l32->regmap = devm_regmap_init_i2c(i2c_client, &cs35l32_regmap);
	if (IS_ERR(cs35l32->regmap)) {
	ret = PTR_ERR(cs35l32->regmap);
	dev_err(&i2c_client->dev, "regmap_init() failed: %d\n", ret);
	return ret;
	}

	if (pdata) {
	cs35l32->pdata = *pdata;
	} else {
	pdata = devm_kzalloc(&i2c_client->dev,
	sizeof(struct cs35l32_platform_data),
	GFP_KERNEL);
	if (!pdata) {
	dev_err(&i2c_client->dev, "could not allocate pdata\n");
	return -ENOMEM;
	}
	if (i2c_client->dev.of_node) {
	ret = cs35l32_handle_of_data(i2c_client,
	&cs35l32->pdata);
	if (ret != 0)
	return ret;
	}
	}

	for (i = 0; i < ARRAY_SIZE(cs35l32->supplies); i++)
	cs35l32->supplies[i].supply = cs35l32_supply_names[i];

	ret = devm_regulator_bulk_get(&i2c_client->dev,
	ARRAY_SIZE(cs35l32->supplies),
	cs35l32->supplies);
	if (ret != 0) {
	dev_err(&i2c_client->dev,
	"Failed to request supplies: %d\n", ret);
	return ret;
	}

	ret = regulator_bulk_enable(ARRAY_SIZE(cs35l32->supplies),
	cs35l32->supplies);
	if (ret != 0) {
	dev_err(&i2c_client->dev,
	"Failed to enable supplies: %d\n", ret);
	return ret;
	}

	/* Reset the Device */
	cs35l32->reset_gpio = devm_gpiod_get_optional(&i2c_client->dev,
	"reset", GPIOD_OUT_LOW);
	if (IS_ERR(cs35l32->reset_gpio))
	return PTR_ERR(cs35l32->reset_gpio);

	if (cs35l32->reset_gpio)
	gpiod_set_value_cansleep(cs35l32->reset_gpio, 1);

	/* initialize codec */
	ret = regmap_read(cs35l32->regmap, CS35L32_DEVID_AB, &reg);
	devid = (reg & 0xFF) << 12;

	ret = regmap_read(cs35l32->regmap, CS35L32_DEVID_CD, &reg);
	devid \|= (reg & 0xFF) << 4;

	ret = regmap_read(cs35l32->regmap, CS35L32_DEVID_E, &reg);
	devid \|= (reg & 0xF0) >> 4;

	if (devid != CS35L32_CHIP_ID) {
	ret = -ENODEV;
	dev_err(&i2c_client->dev,
	"CS35L32 Device ID (%X). Expected %X\n",
	devid, CS35L32_CHIP_ID);
	return ret;
	}

	ret = regmap_read(cs35l32->regmap, CS35L32_REV_ID, &reg);
	if (ret < 0) {
	dev_err(&i2c_client->dev, "Get Revision ID failed\n");
	return ret;
	}

	ret = regmap_register_patch(cs35l32->regmap, cs35l32_monitor_patch,
	ARRAY_SIZE(cs35l32_monitor_patch));
	if (ret < 0) {
	dev_err(&i2c_client->dev, "Failed to apply errata patch\n");
	return ret;
	}

	dev_info(&i2c_client->dev,
	"Cirrus Logic CS35L32, Revision: %02X\n", reg & 0xFF);

	/* Setup VBOOST Management */
	if (cs35l32->pdata.boost_mng)
	regmap_update_bits(cs35l32->regmap, CS35L32_AUDIO_LED_MNGR,
	CS35L32_BOOST_MASK,
	cs35l32->pdata.boost_mng);

	/* Setup ADSP Format Config */
	if (cs35l32->pdata.sdout_share)
	regmap_update_bits(cs35l32->regmap, CS35L32_ADSP_CTL,
	CS35L32_ADSP_SHARE_MASK,
	cs35l32->pdata.sdout_share << 3);

	/* Setup ADSP Data Configuration */
	if (cs35l32->pdata.sdout_datacfg)
	regmap_update_bits(cs35l32->regmap, CS35L32_ADSP_CTL,
	CS35L32_ADSP_DATACFG_MASK,
	cs35l32->pdata.sdout_datacfg << 4);

	/* Setup Low Battery Recovery */
	if (cs35l32->pdata.batt_recov)
	regmap_update_bits(cs35l32->regmap, CS35L32_BATT_THRESHOLD,
	CS35L32_BATT_REC_MASK,
	cs35l32->pdata.batt_recov << 1);

	/* Setup Low Battery Threshold */
	if (cs35l32->pdata.batt_thresh)
	regmap_update_bits(cs35l32->regmap, CS35L32_BATT_THRESHOLD,
	CS35L32_BATT_THRESH_MASK,
	cs35l32->pdata.batt_thresh << 4);

	/* Power down the AMP */
	regmap_update_bits(cs35l32->regmap, CS35L32_PWRCTL1, CS35L32_PDN_AMP,
	CS35L32_PDN_AMP);

	/* Clear MCLK Error Bit since we don't have the clock yet */
	ret = regmap_read(cs35l32->regmap, CS35L32_INT_STATUS_1, &reg);

	ret = snd_soc_register_codec(&i2c_client->dev,
	&soc_codec_dev_cs35l32, cs35l32_dai,
	ARRAY_SIZE(cs35l32_dai));
	if (ret < 0)
	goto err_disable;

	return 0;

	err_disable:
	regulator_bulk_disable(ARRAY_SIZE(cs35l32->supplies),
	cs35l32->supplies);
	return ret;
	}

	static int cs35l32_i2c_remove(struct i2c_client *i2c_client)
	{
	struct cs35l32_private *cs35l32 = i2c_get_clientdata(i2c_client);

	snd_soc_unregister_codec(&i2c_client->dev);

	/* Hold down reset */
	if (cs35l32->reset_gpio)
	gpiod_set_value_cansleep(cs35l32->reset_gpio, 0);

	return 0;
	}

	#ifdef CONFIG_PM
	static int cs35l32_runtime_suspend(struct device *dev)
	{
	struct cs35l32_private *cs35l32 = dev_get_drvdata(dev);

	regcache_cache_only(cs35l32->regmap, true);
	regcache_mark_dirty(cs35l32->regmap);

	/* Hold down reset */
	if (cs35l32->reset_gpio)
	gpiod_set_value_cansleep(cs35l32->reset_gpio, 0);

	/* remove power */
	regulator_bulk_disable(ARRAY_SIZE(cs35l32->supplies),
	cs35l32->supplies);

	return 0;
	}

	static int cs35l32_runtime_resume(struct device *dev)
	{
	struct cs35l32_private *cs35l32 = dev_get_drvdata(dev);
	int ret;

	/* Enable power */
	ret = regulator_bulk_enable(ARRAY_SIZE(cs35l32->supplies),
	cs35l32->supplies);
	if (ret != 0) {
	dev_err(dev, "Failed to enable supplies: %d\n",
	ret);
	return ret;
	}

	if (cs35l32->reset_gpio)
	gpiod_set_value_cansleep(cs35l32->reset_gpio, 1);

	regcache_cache_only(cs35l32->regmap, false);
	regcache_sync(cs35l32->regmap);

	return 0;
	}
	#endif

	static const struct dev_pm_ops cs35l32_runtime_pm = {
	SET_RUNTIME_PM_OPS(cs35l32_runtime_suspend, cs35l32_runtime_resume,
	NULL)
	};

	static const struct of_device_id cs35l32_of_match[] = {
	{ .compatible = "cirrus,cs35l32", },
	{},
	};
	MODULE_DEVICE_TABLE(of, cs35l32_of_match);


	static const struct i2c_device_id cs35l32_id[] = {
	{"cs35l32", 0},
	{}
	};

	MODULE_DEVICE_TABLE(i2c, cs35l32_id);

	static struct i2c_driver cs35l32_i2c_driver = {
	.driver = {
	.name = "cs35l32",
	.owner = THIS_MODULE,
	.pm = &cs35l32_runtime_pm,
	.of_match_table = cs35l32_of_match,
	},
	.id_table = cs35l32_id,
	.probe = cs35l32_i2c_probe,
	.remove = cs35l32_i2c_remove,
	};

	module_i2c_driver(cs35l32_i2c_driver);

	MODULE_DESCRIPTION("ASoC CS35L32 driver");
	MODULE_AUTHOR("Brian Austin, Cirrus Logic Inc, <brian.austin@cirrus.com>");
	MODULE_LICENSE("GPL");