drivers/leds/leds-lm3642.c - arm/linux-arm64-legacy - Git at Google

 /*
 * Simple driver for Texas Instruments LM3642 LED Flash driver chip
 * Copyright (C) 2012 Texas Instruments
 *
 * 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/delay.h>
 #include <linux/i2c.h>
 #include <linux/leds.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
 #include <linux/fs.h>
 #include <linux/regmap.h>
 #include <linux/workqueue.h>
 #include <linux/platform_data/leds-lm3642.h>

 #define	REG_FILT_TIME			(0x0)
 #define	REG_IVFM_MODE			(0x1)
 #define	REG_TORCH_TIME			(0x6)
 #define	REG_FLASH			(0x8)
 #define	REG_I_CTRL			(0x9)
 #define	REG_ENABLE			(0xA)
 #define	REG_FLAG			(0xB)
 #define	REG_MAX				(0xB)

 #define	UVLO_EN_SHIFT			(7)
 #define	IVM_D_TH_SHIFT			(2)
 #define	TORCH_RAMP_UP_TIME_SHIFT	(3)
 #define	TORCH_RAMP_DN_TIME_SHIFT	(0)
 #define	INDUCTOR_I_LIMIT_SHIFT		(6)
 #define	FLASH_RAMP_TIME_SHIFT		(3)
 #define	FLASH_TOUT_TIME_SHIFT		(0)
 #define	TORCH_I_SHIFT			(4)
 #define	FLASH_I_SHIFT			(0)
 #define	IVFM_SHIFT			(7)
 #define	TX_PIN_EN_SHIFT			(6)
 #define	STROBE_PIN_EN_SHIFT		(5)
 #define	TORCH_PIN_EN_SHIFT		(4)
 #define	MODE_BITS_SHIFT			(0)

 #define	UVLO_EN_MASK			(0x1)
 #define	IVM_D_TH_MASK			(0x7)
 #define	TORCH_RAMP_UP_TIME_MASK		(0x7)
 #define	TORCH_RAMP_DN_TIME_MASK		(0x7)
 #define	INDUCTOR_I_LIMIT_MASK		(0x1)
 #define	FLASH_RAMP_TIME_MASK		(0x7)
 #define	FLASH_TOUT_TIME_MASK		(0x7)
 #define	TORCH_I_MASK			(0x7)
 #define	FLASH_I_MASK			(0xF)
 #define	IVFM_MASK			(0x1)
 #define	TX_PIN_EN_MASK			(0x1)
 #define	STROBE_PIN_EN_MASK		(0x1)
 #define	TORCH_PIN_EN_MASK		(0x1)
 #define	MODE_BITS_MASK			(0x73)
 #define EX_PIN_CONTROL_MASK		(0x71)
 #define EX_PIN_ENABLE_MASK		(0x70)

 enum lm3642_mode {
 	MODES_STASNDBY = 0,
 	MODES_INDIC,
 	MODES_TORCH,
 	MODES_FLASH
 };

 struct lm3642_chip_data {
 	struct device *dev;

 	struct led_classdev cdev_flash;
 	struct led_classdev cdev_torch;
 	struct led_classdev cdev_indicator;

 	struct work_struct work_flash;
 	struct work_struct work_torch;
 	struct work_struct work_indicator;

 	u8 br_flash;
 	u8 br_torch;
 	u8 br_indicator;

 	enum lm3642_torch_pin_enable torch_pin;
 	enum lm3642_strobe_pin_enable strobe_pin;
 	enum lm3642_tx_pin_enable tx_pin;

 	struct lm3642_platform_data *pdata;
 	struct regmap *regmap;
 	struct mutex lock;

 	unsigned int last_flag;
 };

 /* chip initialize */
 static int lm3642_chip_init(struct lm3642_chip_data *chip)
 {
 	int ret;
 	struct lm3642_platform_data *pdata = chip->pdata;

 	/* set enable register */
 	ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK,
 				 pdata->tx_pin);
 	if (ret < 0)
 		dev_err(chip->dev, "Failed to update REG_ENABLE Register\n");
 	return ret;
 }

 /* chip control */
 static int lm3642_control(struct lm3642_chip_data *chip,
 			  u8 brightness, enum lm3642_mode opmode)
 {
 	int ret;

 	ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
 		goto out;
 	}

 	if (chip->last_flag)
 		dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag);

 	/* brightness 0 means off-state */
 	if (!brightness)
 		opmode = MODES_STASNDBY;

 	switch (opmode) {
 	case MODES_TORCH:
 		ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
 					 TORCH_I_MASK << TORCH_I_SHIFT,
 					 (brightness - 1) << TORCH_I_SHIFT);

 		if (chip->torch_pin)
 			opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
 		break;

 	case MODES_FLASH:
 		ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
 					 FLASH_I_MASK << FLASH_I_SHIFT,
 					 (brightness - 1) << FLASH_I_SHIFT);

 		if (chip->strobe_pin)
 			opmode |= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT);
 		break;

 	case MODES_INDIC:
 		ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
 					 TORCH_I_MASK << TORCH_I_SHIFT,
 					 (brightness - 1) << TORCH_I_SHIFT);
 		break;

 	case MODES_STASNDBY:

 		break;

 	default:
 		return ret;
 	}
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
 		goto out;
 	}

 	if (chip->tx_pin)
 		opmode |= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT);

 	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
 				 MODE_BITS_MASK << MODE_BITS_SHIFT,
 				 opmode << MODE_BITS_SHIFT);
 out:
 	return ret;
 }

 /* torch */

 /* torch pin config for lm3642*/
 static ssize_t lm3642_torch_pin_store(struct device *dev,
 				      struct device_attribute *attr,
 				      const char *buf, size_t size)
 {
 	ssize_t ret;
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3642_chip_data *chip =
 	    container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
 	unsigned int state;

 	ret = kstrtouint(buf, 10, &state);
 	if (ret)
 		goto out_strtoint;
 	if (state != 0)
 		state = 0x01 << TORCH_PIN_EN_SHIFT;

 	chip->torch_pin = state;
 	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
 				 TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT,
 				 state);
 	if (ret < 0)
 		goto out;

 	return size;
 out:
 	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
 	return ret;
 out_strtoint:
 	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
 	return ret;
 }

 static DEVICE_ATTR(torch_pin, S_IWUSR, NULL, lm3642_torch_pin_store);

 static void lm3642_deferred_torch_brightness_set(struct work_struct *work)
 {
 	struct lm3642_chip_data *chip =
 	    container_of(work, struct lm3642_chip_data, work_torch);

 	mutex_lock(&chip->lock);
 	lm3642_control(chip, chip->br_torch, MODES_TORCH);
 	mutex_unlock(&chip->lock);
 }

 static void lm3642_torch_brightness_set(struct led_classdev *cdev,
 					enum led_brightness brightness)
 {
 	struct lm3642_chip_data *chip =
 	    container_of(cdev, struct lm3642_chip_data, cdev_torch);

 	chip->br_torch = brightness;
 	schedule_work(&chip->work_torch);
 }

 /* flash */

 /* strobe pin config for lm3642*/
 static ssize_t lm3642_strobe_pin_store(struct device *dev,
 				       struct device_attribute *attr,
 				       const char *buf, size_t size)
 {
 	ssize_t ret;
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3642_chip_data *chip =
 	    container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
 	unsigned int state;

 	ret = kstrtouint(buf, 10, &state);
 	if (ret)
 		goto out_strtoint;
 	if (state != 0)
 		state = 0x01 << STROBE_PIN_EN_SHIFT;

 	chip->strobe_pin = state;
 	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
 				 STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT,
 				 state);
 	if (ret < 0)
 		goto out;

 	return size;
 out:
 	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
 	return ret;
 out_strtoint:
 	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
 	return ret;
 }

 static DEVICE_ATTR(strobe_pin, S_IWUSR, NULL, lm3642_strobe_pin_store);

 static void lm3642_deferred_strobe_brightness_set(struct work_struct *work)
 {
 	struct lm3642_chip_data *chip =
 	    container_of(work, struct lm3642_chip_data, work_flash);

 	mutex_lock(&chip->lock);
 	lm3642_control(chip, chip->br_flash, MODES_FLASH);
 	mutex_unlock(&chip->lock);
 }

 static void lm3642_strobe_brightness_set(struct led_classdev *cdev,
 					 enum led_brightness brightness)
 {
 	struct lm3642_chip_data *chip =
 	    container_of(cdev, struct lm3642_chip_data, cdev_flash);

 	chip->br_flash = brightness;
 	schedule_work(&chip->work_flash);
 }

 /* indicator */
 static void lm3642_deferred_indicator_brightness_set(struct work_struct *work)
 {
 	struct lm3642_chip_data *chip =
 	    container_of(work, struct lm3642_chip_data, work_indicator);

 	mutex_lock(&chip->lock);
 	lm3642_control(chip, chip->br_indicator, MODES_INDIC);
 	mutex_unlock(&chip->lock);
 }

 static void lm3642_indicator_brightness_set(struct led_classdev *cdev,
 					    enum led_brightness brightness)
 {
 	struct lm3642_chip_data *chip =
 	    container_of(cdev, struct lm3642_chip_data, cdev_indicator);

 	chip->br_indicator = brightness;
 	schedule_work(&chip->work_indicator);
 }

 static const struct regmap_config lm3642_regmap = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = REG_MAX,
 };

 static int lm3642_probe(struct i2c_client *client,
 				  const struct i2c_device_id *id)
 {
 	struct lm3642_platform_data *pdata = dev_get_platdata(&client->dev);
 	struct lm3642_chip_data *chip;

 	int err;

 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		dev_err(&client->dev, "i2c functionality check fail.\n");
 		return -EOPNOTSUPP;
 	}

 	if (pdata == NULL) {
 		dev_err(&client->dev, "needs Platform Data.\n");
 		return -ENODATA;
 	}

 	chip = devm_kzalloc(&client->dev,
 			    sizeof(struct lm3642_chip_data), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;

 	chip->dev = &client->dev;
 	chip->pdata = pdata;

 	chip->tx_pin = pdata->tx_pin;
 	chip->torch_pin = pdata->torch_pin;
 	chip->strobe_pin = pdata->strobe_pin;

 	chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap);
 	if (IS_ERR(chip->regmap)) {
 		err = PTR_ERR(chip->regmap);
 		dev_err(&client->dev, "Failed to allocate register map: %d\n",
 			err);
 		return err;
 	}

 	mutex_init(&chip->lock);
 	i2c_set_clientdata(client, chip);

 	err = lm3642_chip_init(chip);
 	if (err < 0)
 		goto err_out;

 	/* flash */
 	INIT_WORK(&chip->work_flash, lm3642_deferred_strobe_brightness_set);
 	chip->cdev_flash.name = "flash";
 	chip->cdev_flash.max_brightness = 16;
 	chip->cdev_flash.brightness_set = lm3642_strobe_brightness_set;
 	chip->cdev_flash.default_trigger = "flash";
 	err = led_classdev_register((struct device *)
 				    &client->dev, &chip->cdev_flash);
 	if (err < 0) {
 		dev_err(chip->dev, "failed to register flash\n");
 		goto err_out;
 	}
 	err = device_create_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
 	if (err < 0) {
 		dev_err(chip->dev, "failed to create strobe-pin file\n");
 		goto err_create_flash_pin_file;
 	}

 	/* torch */
 	INIT_WORK(&chip->work_torch, lm3642_deferred_torch_brightness_set);
 	chip->cdev_torch.name = "torch";
 	chip->cdev_torch.max_brightness = 8;
 	chip->cdev_torch.brightness_set = lm3642_torch_brightness_set;
 	chip->cdev_torch.default_trigger = "torch";
 	err = led_classdev_register((struct device *)
 				    &client->dev, &chip->cdev_torch);
 	if (err < 0) {
 		dev_err(chip->dev, "failed to register torch\n");
 		goto err_create_torch_file;
 	}
 	err = device_create_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
 	if (err < 0) {
 		dev_err(chip->dev, "failed to create torch-pin file\n");
 		goto err_create_torch_pin_file;
 	}

 	/* indicator */
 	INIT_WORK(&chip->work_indicator,
 		  lm3642_deferred_indicator_brightness_set);
 	chip->cdev_indicator.name = "indicator";
 	chip->cdev_indicator.max_brightness = 8;
 	chip->cdev_indicator.brightness_set = lm3642_indicator_brightness_set;
 	err = led_classdev_register((struct device *)
 				    &client->dev, &chip->cdev_indicator);
 	if (err < 0) {
 		dev_err(chip->dev, "failed to register indicator\n");
 		goto err_create_indicator_file;
 	}

 	dev_info(&client->dev, "LM3642 is initialized\n");
 	return 0;

 err_create_indicator_file:
 	device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
 err_create_torch_pin_file:
 	led_classdev_unregister(&chip->cdev_torch);
 err_create_torch_file:
 	device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
 err_create_flash_pin_file:
 	led_classdev_unregister(&chip->cdev_flash);
 err_out:
 	return err;
 }

 static int lm3642_remove(struct i2c_client *client)
 {
 	struct lm3642_chip_data *chip = i2c_get_clientdata(client);

 	led_classdev_unregister(&chip->cdev_indicator);
 	flush_work(&chip->work_indicator);
 	device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
 	led_classdev_unregister(&chip->cdev_torch);
 	flush_work(&chip->work_torch);
 	device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
 	led_classdev_unregister(&chip->cdev_flash);
 	flush_work(&chip->work_flash);
 	regmap_write(chip->regmap, REG_ENABLE, 0);
 	return 0;
 }

 static const struct i2c_device_id lm3642_id[] = {
 	{LM3642_NAME, 0},
 	{}
 };

 MODULE_DEVICE_TABLE(i2c, lm3642_id);

 static struct i2c_driver lm3642_i2c_driver = {
 	.driver = {
 		   .name = LM3642_NAME,
 		   .owner = THIS_MODULE,
 		   .pm = NULL,
 		   },
 	.probe = lm3642_probe,
 	.remove = lm3642_remove,
 	.id_table = lm3642_id,
 };

 module_i2c_driver(lm3642_i2c_driver);

 MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642");
 MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
 MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
 MODULE_LICENSE("GPL v2");
	/*
	* Simple driver for Texas Instruments LM3642 LED Flash driver chip
	* Copyright (C) 2012 Texas Instruments
	*
	* 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/delay.h>
	#include <linux/i2c.h>
	#include <linux/leds.h>
	#include <linux/slab.h>
	#include <linux/platform_device.h>
	#include <linux/fs.h>
	#include <linux/regmap.h>
	#include <linux/workqueue.h>
	#include <linux/platform_data/leds-lm3642.h>

	#define REG_FILT_TIME (0x0)
	#define REG_IVFM_MODE (0x1)
	#define REG_TORCH_TIME (0x6)
	#define REG_FLASH (0x8)
	#define REG_I_CTRL (0x9)
	#define REG_ENABLE (0xA)
	#define REG_FLAG (0xB)
	#define REG_MAX (0xB)

	#define UVLO_EN_SHIFT (7)
	#define IVM_D_TH_SHIFT (2)
	#define TORCH_RAMP_UP_TIME_SHIFT (3)
	#define TORCH_RAMP_DN_TIME_SHIFT (0)
	#define INDUCTOR_I_LIMIT_SHIFT (6)
	#define FLASH_RAMP_TIME_SHIFT (3)
	#define FLASH_TOUT_TIME_SHIFT (0)
	#define TORCH_I_SHIFT (4)
	#define FLASH_I_SHIFT (0)
	#define IVFM_SHIFT (7)
	#define TX_PIN_EN_SHIFT (6)
	#define STROBE_PIN_EN_SHIFT (5)
	#define TORCH_PIN_EN_SHIFT (4)
	#define MODE_BITS_SHIFT (0)

	#define UVLO_EN_MASK (0x1)
	#define IVM_D_TH_MASK (0x7)
	#define TORCH_RAMP_UP_TIME_MASK (0x7)
	#define TORCH_RAMP_DN_TIME_MASK (0x7)
	#define INDUCTOR_I_LIMIT_MASK (0x1)
	#define FLASH_RAMP_TIME_MASK (0x7)
	#define FLASH_TOUT_TIME_MASK (0x7)
	#define TORCH_I_MASK (0x7)
	#define FLASH_I_MASK (0xF)
	#define IVFM_MASK (0x1)
	#define TX_PIN_EN_MASK (0x1)
	#define STROBE_PIN_EN_MASK (0x1)
	#define TORCH_PIN_EN_MASK (0x1)
	#define MODE_BITS_MASK (0x73)
	#define EX_PIN_CONTROL_MASK (0x71)
	#define EX_PIN_ENABLE_MASK (0x70)

	enum lm3642_mode {
	MODES_STASNDBY = 0,
	MODES_INDIC,
	MODES_TORCH,
	MODES_FLASH
	};

	struct lm3642_chip_data {
	struct device *dev;

	struct led_classdev cdev_flash;
	struct led_classdev cdev_torch;
	struct led_classdev cdev_indicator;

	struct work_struct work_flash;
	struct work_struct work_torch;
	struct work_struct work_indicator;

	u8 br_flash;
	u8 br_torch;
	u8 br_indicator;

	enum lm3642_torch_pin_enable torch_pin;
	enum lm3642_strobe_pin_enable strobe_pin;
	enum lm3642_tx_pin_enable tx_pin;

	struct lm3642_platform_data *pdata;
	struct regmap *regmap;
	struct mutex lock;

	unsigned int last_flag;
	};

	/* chip initialize */
	static int lm3642_chip_init(struct lm3642_chip_data *chip)
	{
	int ret;
	struct lm3642_platform_data *pdata = chip->pdata;

	/* set enable register */
	ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK,
	pdata->tx_pin);
	if (ret < 0)
	dev_err(chip->dev, "Failed to update REG_ENABLE Register\n");
	return ret;
	}

	/* chip control */
	static int lm3642_control(struct lm3642_chip_data *chip,
	u8 brightness, enum lm3642_mode opmode)
	{
	int ret;

	ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
	goto out;
	}

	if (chip->last_flag)
	dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag);

	/* brightness 0 means off-state */
	if (!brightness)
	opmode = MODES_STASNDBY;

	switch (opmode) {
	case MODES_TORCH:
	ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
	TORCH_I_MASK << TORCH_I_SHIFT,
	(brightness - 1) << TORCH_I_SHIFT);

	if (chip->torch_pin)
	opmode \|= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
	break;

	case MODES_FLASH:
	ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
	FLASH_I_MASK << FLASH_I_SHIFT,
	(brightness - 1) << FLASH_I_SHIFT);

	if (chip->strobe_pin)
	opmode \|= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT);
	break;

	case MODES_INDIC:
	ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
	TORCH_I_MASK << TORCH_I_SHIFT,
	(brightness - 1) << TORCH_I_SHIFT);
	break;

	case MODES_STASNDBY:

	break;

	default:
	return ret;
	}
	if (ret < 0) {
	dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
	goto out;
	}

	if (chip->tx_pin)
	opmode \|= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT);

	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
	MODE_BITS_MASK << MODE_BITS_SHIFT,
	opmode << MODE_BITS_SHIFT);
	out:
	return ret;
	}

	/* torch */

	/* torch pin config for lm3642*/
	static ssize_t lm3642_torch_pin_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t size)
	{
	ssize_t ret;
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3642_chip_data *chip =
	container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
	unsigned int state;

	ret = kstrtouint(buf, 10, &state);
	if (ret)
	goto out_strtoint;
	if (state != 0)
	state = 0x01 << TORCH_PIN_EN_SHIFT;

	chip->torch_pin = state;
	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
	TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT,
	state);
	if (ret < 0)
	goto out;

	return size;
	out:
	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
	return ret;
	out_strtoint:
	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
	return ret;
	}

	static DEVICE_ATTR(torch_pin, S_IWUSR, NULL, lm3642_torch_pin_store);

	static void lm3642_deferred_torch_brightness_set(struct work_struct *work)
	{
	struct lm3642_chip_data *chip =
	container_of(work, struct lm3642_chip_data, work_torch);

	mutex_lock(&chip->lock);
	lm3642_control(chip, chip->br_torch, MODES_TORCH);
	mutex_unlock(&chip->lock);
	}

	static void lm3642_torch_brightness_set(struct led_classdev *cdev,
	enum led_brightness brightness)
	{
	struct lm3642_chip_data *chip =
	container_of(cdev, struct lm3642_chip_data, cdev_torch);

	chip->br_torch = brightness;
	schedule_work(&chip->work_torch);
	}

	/* flash */

	/* strobe pin config for lm3642*/
	static ssize_t lm3642_strobe_pin_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t size)
	{
	ssize_t ret;
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3642_chip_data *chip =
	container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
	unsigned int state;

	ret = kstrtouint(buf, 10, &state);
	if (ret)
	goto out_strtoint;
	if (state != 0)
	state = 0x01 << STROBE_PIN_EN_SHIFT;

	chip->strobe_pin = state;
	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
	STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT,
	state);
	if (ret < 0)
	goto out;

	return size;
	out:
	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
	return ret;
	out_strtoint:
	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
	return ret;
	}

	static DEVICE_ATTR(strobe_pin, S_IWUSR, NULL, lm3642_strobe_pin_store);

	static void lm3642_deferred_strobe_brightness_set(struct work_struct *work)
	{
	struct lm3642_chip_data *chip =
	container_of(work, struct lm3642_chip_data, work_flash);

	mutex_lock(&chip->lock);
	lm3642_control(chip, chip->br_flash, MODES_FLASH);
	mutex_unlock(&chip->lock);
	}

	static void lm3642_strobe_brightness_set(struct led_classdev *cdev,
	enum led_brightness brightness)
	{
	struct lm3642_chip_data *chip =
	container_of(cdev, struct lm3642_chip_data, cdev_flash);

	chip->br_flash = brightness;
	schedule_work(&chip->work_flash);
	}

	/* indicator */
	static void lm3642_deferred_indicator_brightness_set(struct work_struct *work)
	{
	struct lm3642_chip_data *chip =
	container_of(work, struct lm3642_chip_data, work_indicator);

	mutex_lock(&chip->lock);
	lm3642_control(chip, chip->br_indicator, MODES_INDIC);
	mutex_unlock(&chip->lock);
	}

	static void lm3642_indicator_brightness_set(struct led_classdev *cdev,
	enum led_brightness brightness)
	{
	struct lm3642_chip_data *chip =
	container_of(cdev, struct lm3642_chip_data, cdev_indicator);

	chip->br_indicator = brightness;
	schedule_work(&chip->work_indicator);
	}

	static const struct regmap_config lm3642_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = REG_MAX,
	};

	static int lm3642_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct lm3642_platform_data *pdata = dev_get_platdata(&client->dev);
	struct lm3642_chip_data *chip;

	int err;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	dev_err(&client->dev, "i2c functionality check fail.\n");
	return -EOPNOTSUPP;
	}

	if (pdata == NULL) {
	dev_err(&client->dev, "needs Platform Data.\n");
	return -ENODATA;
	}

	chip = devm_kzalloc(&client->dev,
	sizeof(struct lm3642_chip_data), GFP_KERNEL);
	if (!chip)
	return -ENOMEM;

	chip->dev = &client->dev;
	chip->pdata = pdata;

	chip->tx_pin = pdata->tx_pin;
	chip->torch_pin = pdata->torch_pin;
	chip->strobe_pin = pdata->strobe_pin;

	chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap);
	if (IS_ERR(chip->regmap)) {
	err = PTR_ERR(chip->regmap);
	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	err);
	return err;
	}

	mutex_init(&chip->lock);
	i2c_set_clientdata(client, chip);

	err = lm3642_chip_init(chip);
	if (err < 0)
	goto err_out;

	/* flash */
	INIT_WORK(&chip->work_flash, lm3642_deferred_strobe_brightness_set);
	chip->cdev_flash.name = "flash";
	chip->cdev_flash.max_brightness = 16;
	chip->cdev_flash.brightness_set = lm3642_strobe_brightness_set;
	chip->cdev_flash.default_trigger = "flash";
	err = led_classdev_register((struct device *)
	&client->dev, &chip->cdev_flash);
	if (err < 0) {
	dev_err(chip->dev, "failed to register flash\n");
	goto err_out;
	}
	err = device_create_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
	if (err < 0) {
	dev_err(chip->dev, "failed to create strobe-pin file\n");
	goto err_create_flash_pin_file;
	}

	/* torch */
	INIT_WORK(&chip->work_torch, lm3642_deferred_torch_brightness_set);
	chip->cdev_torch.name = "torch";
	chip->cdev_torch.max_brightness = 8;
	chip->cdev_torch.brightness_set = lm3642_torch_brightness_set;
	chip->cdev_torch.default_trigger = "torch";
	err = led_classdev_register((struct device *)
	&client->dev, &chip->cdev_torch);
	if (err < 0) {
	dev_err(chip->dev, "failed to register torch\n");
	goto err_create_torch_file;
	}
	err = device_create_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
	if (err < 0) {
	dev_err(chip->dev, "failed to create torch-pin file\n");
	goto err_create_torch_pin_file;
	}

	/* indicator */
	INIT_WORK(&chip->work_indicator,
	lm3642_deferred_indicator_brightness_set);
	chip->cdev_indicator.name = "indicator";
	chip->cdev_indicator.max_brightness = 8;
	chip->cdev_indicator.brightness_set = lm3642_indicator_brightness_set;
	err = led_classdev_register((struct device *)
	&client->dev, &chip->cdev_indicator);
	if (err < 0) {
	dev_err(chip->dev, "failed to register indicator\n");
	goto err_create_indicator_file;
	}

	dev_info(&client->dev, "LM3642 is initialized\n");
	return 0;

	err_create_indicator_file:
	device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
	err_create_torch_pin_file:
	led_classdev_unregister(&chip->cdev_torch);
	err_create_torch_file:
	device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
	err_create_flash_pin_file:
	led_classdev_unregister(&chip->cdev_flash);
	err_out:
	return err;
	}

	static int lm3642_remove(struct i2c_client *client)
	{
	struct lm3642_chip_data *chip = i2c_get_clientdata(client);

	led_classdev_unregister(&chip->cdev_indicator);
	flush_work(&chip->work_indicator);
	device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
	led_classdev_unregister(&chip->cdev_torch);
	flush_work(&chip->work_torch);
	device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
	led_classdev_unregister(&chip->cdev_flash);
	flush_work(&chip->work_flash);
	regmap_write(chip->regmap, REG_ENABLE, 0);
	return 0;
	}

	static const struct i2c_device_id lm3642_id[] = {
	{LM3642_NAME, 0},
	{}
	};

	MODULE_DEVICE_TABLE(i2c, lm3642_id);

	static struct i2c_driver lm3642_i2c_driver = {
	.driver = {
	.name = LM3642_NAME,
	.owner = THIS_MODULE,
	.pm = NULL,
	},
	.probe = lm3642_probe,
	.remove = lm3642_remove,
	.id_table = lm3642_id,
	};

	module_i2c_driver(lm3642_i2c_driver);

	MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642");
	MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
	MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
	MODULE_LICENSE("GPL v2");