drivers/leds/leds-lm3556.c - kernel/msm-4.9 - Gitiles

 /*
  * Simple driver for Texas Instruments LM3556 LED Flash driver chip (Rev0x03)
  * 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.
  *
  * Please refer Documentation/leds/leds-lm3556.txt file.
  */
 #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/platform_data/leds-lm3556.h>

 #define REG_FILT_TIME			(0x0)
 #define REG_IVFM_MODE			(0x1)
 #define REG_NTC				(0x2)
 #define REG_INDIC_TIME			(0x3)
 #define REG_INDIC_BLINK			(0x4)
 #define REG_INDIC_PERIOD		(0x5)
 #define REG_TORCH_TIME			(0x6)
 #define REG_CONF			(0x7)
 #define REG_FLASH			(0x8)
 #define REG_I_CTRL			(0x9)
 #define REG_ENABLE			(0xA)
 #define REG_FLAG			(0xB)
 #define REG_MAX				(0xB)

 #define IVFM_FILTER_TIME_SHIFT		(3)
 #define UVLO_EN_SHIFT			(7)
 #define HYSTERSIS_SHIFT			(5)
 #define IVM_D_TH_SHIFT			(2)
 #define IVFM_ADJ_MODE_SHIFT		(0)
 #define NTC_EVENT_LVL_SHIFT		(5)
 #define NTC_TRIP_TH_SHIFT		(2)
 #define NTC_BIAS_I_LVL_SHIFT		(0)
 #define INDIC_RAMP_UP_TIME_SHIFT	(3)
 #define INDIC_RAMP_DN_TIME_SHIFT	(0)
 #define INDIC_N_BLANK_SHIFT		(4)
 #define INDIC_PULSE_TIME_SHIFT		(0)
 #define INDIC_N_PERIOD_SHIFT		(0)
 #define TORCH_RAMP_UP_TIME_SHIFT	(3)
 #define TORCH_RAMP_DN_TIME_SHIFT	(0)
 #define STROBE_USUAGE_SHIFT		(7)
 #define STROBE_PIN_POLARITY_SHIFT	(6)
 #define TORCH_PIN_POLARITY_SHIFT	(5)
 #define TX_PIN_POLARITY_SHIFT		(4)
 #define TX_EVENT_LVL_SHIFT		(3)
 #define IVFM_EN_SHIFT			(2)
 #define NTC_MODE_SHIFT			(1)
 #define INDIC_MODE_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 NTC_EN_SHIFT			(7)
 #define TX_PIN_EN_SHIFT			(6)
 #define STROBE_PIN_EN_SHIFT		(5)
 #define TORCH_PIN_EN_SHIFT		(4)
 #define PRECHG_MODE_EN_SHIFT		(3)
 #define PASS_MODE_ONLY_EN_SHIFT		(2)
 #define MODE_BITS_SHIFT			(0)

 #define IVFM_FILTER_TIME_MASK		(0x3)
 #define UVLO_EN_MASK			(0x1)
 #define HYSTERSIS_MASK			(0x3)
 #define IVM_D_TH_MASK			(0x7)
 #define IVFM_ADJ_MODE_MASK		(0x3)
 #define NTC_EVENT_LVL_MASK		(0x1)
 #define NTC_TRIP_TH_MASK		(0x7)
 #define NTC_BIAS_I_LVL_MASK		(0x3)
 #define INDIC_RAMP_UP_TIME_MASK		(0x7)
 #define INDIC_RAMP_DN_TIME_MASK		(0x7)
 #define INDIC_N_BLANK_MASK		(0x7)
 #define INDIC_PULSE_TIME_MASK		(0x7)
 #define INDIC_N_PERIOD_MASK		(0x7)
 #define TORCH_RAMP_UP_TIME_MASK		(0x7)
 #define TORCH_RAMP_DN_TIME_MASK		(0x7)
 #define STROBE_USUAGE_MASK		(0x1)
 #define STROBE_PIN_POLARITY_MASK	(0x1)
 #define TORCH_PIN_POLARITY_MASK		(0x1)
 #define TX_PIN_POLARITY_MASK		(0x1)
 #define TX_EVENT_LVL_MASK		(0x1)
 #define IVFM_EN_MASK			(0x1)
 #define NTC_MODE_MASK			(0x1)
 #define INDIC_MODE_MASK			(0x1)
 #define INDUCTOR_I_LIMIT_MASK		(0x3)
 #define FLASH_RAMP_TIME_MASK		(0x7)
 #define FLASH_TOUT_TIME_MASK		(0x7)
 #define TORCH_I_MASK			(0x7)
 #define FLASH_I_MASK			(0xF)
 #define NTC_EN_MASK			(0x1)
 #define TX_PIN_EN_MASK			(0x1)
 #define STROBE_PIN_EN_MASK		(0x1)
 #define TORCH_PIN_EN_MASK		(0x1)
 #define PRECHG_MODE_EN_MASK		(0x1)
 #define PASS_MODE_ONLY_EN_MASK		(0x1)
 #define MODE_BITS_MASK			(0x13)
 #define EX_PIN_CONTROL_MASK		(0xF1)
 #define EX_PIN_ENABLE_MASK		(0x70)

 enum lm3556_indic_pulse_time {
 	PULSE_TIME_0_MS = 0,
 	PULSE_TIME_32_MS,
 	PULSE_TIME_64_MS,
 	PULSE_TIME_92_MS,
 	PULSE_TIME_128_MS,
 	PULSE_TIME_160_MS,
 	PULSE_TIME_196_MS,
 	PULSE_TIME_224_MS,
 	PULSE_TIME_256_MS,
 	PULSE_TIME_288_MS,
 	PULSE_TIME_320_MS,
 	PULSE_TIME_352_MS,
 	PULSE_TIME_384_MS,
 	PULSE_TIME_416_MS,
 	PULSE_TIME_448_MS,
 	PULSE_TIME_480_MS,
 };

 enum lm3556_indic_n_blank {
 	INDIC_N_BLANK_0 = 0,
 	INDIC_N_BLANK_1,
 	INDIC_N_BLANK_2,
 	INDIC_N_BLANK_3,
 	INDIC_N_BLANK_4,
 	INDIC_N_BLANK_5,
 	INDIC_N_BLANK_6,
 	INDIC_N_BLANK_7,
 	INDIC_N_BLANK_8,
 	INDIC_N_BLANK_9,
 	INDIC_N_BLANK_10,
 	INDIC_N_BLANK_11,
 	INDIC_N_BLANK_12,
 	INDIC_N_BLANK_13,
 	INDIC_N_BLANK_14,
 	INDIC_N_BLANK_15,
 };

 enum lm3556_indic_period {
 	INDIC_PERIOD_0 = 0,
 	INDIC_PERIOD_1,
 	INDIC_PERIOD_2,
 	INDIC_PERIOD_3,
 	INDIC_PERIOD_4,
 	INDIC_PERIOD_5,
 	INDIC_PERIOD_6,
 	INDIC_PERIOD_7,
 };

 enum lm3556_mode {
 	MODES_STASNDBY = 0,
 	MODES_INDIC,
 	MODES_TORCH,
 	MODES_FLASH
 };

 #define INDIC_PATTERN_SIZE 4

 struct indicator {
 	u8 blinking;
 	u8 period_cnt;
 };

 struct lm3556_chip_data {
 	struct device *dev;

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

 	struct lm3556_platform_data *pdata;
 	struct regmap *regmap;
 	struct mutex lock;

 	unsigned int last_flag;
 };

 /* indicator pattern */
 static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = {
 	[0] = {(INDIC_N_BLANK_1 << INDIC_N_BLANK_SHIFT)
 	       | PULSE_TIME_32_MS, INDIC_PERIOD_1},
 	[1] = {(INDIC_N_BLANK_15 << INDIC_N_BLANK_SHIFT)
 	       | PULSE_TIME_32_MS, INDIC_PERIOD_2},
 	[2] = {(INDIC_N_BLANK_10 << INDIC_N_BLANK_SHIFT)
 	       | PULSE_TIME_32_MS, INDIC_PERIOD_4},
 	[3] = {(INDIC_N_BLANK_5 << INDIC_N_BLANK_SHIFT)
 	       | PULSE_TIME_32_MS, INDIC_PERIOD_7},
 };

 /* chip initialize */
 static int __devinit lm3556_chip_init(struct lm3556_chip_data *chip)
 {
 	unsigned int reg_val;
 	int ret;
 	struct lm3556_platform_data *pdata = chip->pdata;

 	/* set config register */
 	ret = regmap_read(chip->regmap, REG_CONF, &reg_val);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to read REG_CONF Register\n");
 		goto out;
 	}

 	reg_val &= (~EX_PIN_CONTROL_MASK);
 	reg_val |= ((pdata->torch_pin_polarity & 0x01)
 		    << TORCH_PIN_POLARITY_SHIFT);
 	reg_val |= ((pdata->strobe_usuage & 0x01) << STROBE_USUAGE_SHIFT);
 	reg_val |= ((pdata->strobe_pin_polarity & 0x01)
 		    << STROBE_PIN_POLARITY_SHIFT);
 	reg_val |= ((pdata->tx_pin_polarity & 0x01) << TX_PIN_POLARITY_SHIFT);
 	reg_val |= ((pdata->indicator_mode & 0x01) << INDIC_MODE_SHIFT);

 	ret = regmap_write(chip->regmap, REG_CONF, reg_val);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to write REG_CONF Regisgter\n");
 		goto out;
 	}

 	/* set enable register */
 	ret = regmap_read(chip->regmap, REG_ENABLE, &reg_val);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to read REG_ENABLE Register\n");
 		goto out;
 	}

 	reg_val &= (~EX_PIN_ENABLE_MASK);
 	reg_val |= ((pdata->torch_pin_en & 0x01) << TORCH_PIN_EN_SHIFT);
 	reg_val |= ((pdata->strobe_pin_en & 0x01) << STROBE_PIN_EN_SHIFT);
 	reg_val |= ((pdata->tx_pin_en & 0x01) << TX_PIN_EN_SHIFT);

 	ret = regmap_write(chip->regmap, REG_ENABLE, reg_val);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n");
 		goto out;
 	}

 out:
 	return ret;
 }

 /* chip control */
 static int lm3556_control(struct lm3556_chip_data *chip,
 			  u8 brightness, enum lm3556_mode opmode)
 {
 	int ret;
 	struct lm3556_platform_data *pdata = chip->pdata;

 	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 (pdata->torch_pin_en)
 			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);
 		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:
 		if (pdata->torch_pin_en)
 			opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
 		break;

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

 out:
 	return ret;
 }

 /* torch */
 static void lm3556_torch_brightness_set(struct led_classdev *cdev,
 					enum led_brightness brightness)
 {
 	struct lm3556_chip_data *chip =
 	    container_of(cdev, struct lm3556_chip_data, cdev_torch);

 	mutex_lock(&chip->lock);
 	lm3556_control(chip, brightness, MODES_TORCH);
 	mutex_unlock(&chip->lock);
 }

 /* flash */
 static void lm3556_strobe_brightness_set(struct led_classdev *cdev,
 					 enum led_brightness brightness)
 {
 	struct lm3556_chip_data *chip =
 	    container_of(cdev, struct lm3556_chip_data, cdev_flash);

 	mutex_lock(&chip->lock);
 	lm3556_control(chip, brightness, MODES_FLASH);
 	mutex_unlock(&chip->lock);
 }

 /* indicator */
 static void lm3556_indicator_brightness_set(struct led_classdev *cdev,
 					    enum led_brightness brightness)
 {
 	struct lm3556_chip_data *chip =
 	    container_of(cdev, struct lm3556_chip_data, cdev_indicator);

 	mutex_lock(&chip->lock);
 	lm3556_control(chip, brightness, MODES_INDIC);
 	mutex_unlock(&chip->lock);
 }

 /* indicator pattern */
 static ssize_t lm3556_indicator_pattern_store(struct device *dev,
 					      struct device_attribute *devAttr,
 					      const char *buf, size_t size)
 {
 	ssize_t ret;
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3556_chip_data *chip =
 	    container_of(led_cdev, struct lm3556_chip_data, cdev_indicator);
 	unsigned int state;

 	ret = kstrtouint(buf, 10, &state);
 	if (ret)
 		goto out;
 	if (state > INDIC_PATTERN_SIZE - 1)
 		state = INDIC_PATTERN_SIZE - 1;

 	ret = regmap_write(chip->regmap, REG_INDIC_BLINK,
 			   indicator_pattern[state].blinking);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n");
 		goto out;
 	}

 	ret = regmap_write(chip->regmap, REG_INDIC_PERIOD,
 			   indicator_pattern[state].period_cnt);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n");
 		goto out;
 	}

 	return size;
 out:
 	dev_err(chip->dev, "Indicator pattern doesn't saved\n");
 	return size;
 }

 static DEVICE_ATTR(pattern, 0666, NULL, lm3556_indicator_pattern_store);

 static const struct regmap_config lm3556_regmap = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = REG_MAX,
 };

 /* module initialize */
 static int __devinit lm3556_probe(struct i2c_client *client,
 				  const struct i2c_device_id *id)
 {
 	struct lm3556_platform_data *pdata = client->dev.platform_data;
 	struct lm3556_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 lm3556_chip_data),
 			 GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;

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

 	chip->regmap = devm_regmap_init_i2c(client, &lm3556_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 = lm3556_chip_init(chip);
 	if (err < 0)
 		goto err_out;

 	/* flash */
 	chip->cdev_flash.name = "flash";
 	chip->cdev_flash.max_brightness = 16;
 	chip->cdev_flash.brightness_set = lm3556_strobe_brightness_set;
 	err = led_classdev_register((struct device *)
 				    &client->dev, &chip->cdev_flash);
 	if (err < 0)
 		goto err_out;
 	/* torch */
 	chip->cdev_torch.name = "torch";
 	chip->cdev_torch.max_brightness = 8;
 	chip->cdev_torch.brightness_set = lm3556_torch_brightness_set;
 	err = led_classdev_register((struct device *)
 				    &client->dev, &chip->cdev_torch);
 	if (err < 0)
 		goto err_create_torch_file;
 	/* indicator */
 	chip->cdev_indicator.name = "indicator";
 	chip->cdev_indicator.max_brightness = 8;
 	chip->cdev_indicator.brightness_set = lm3556_indicator_brightness_set;
 	err = led_classdev_register((struct device *)
 				    &client->dev, &chip->cdev_indicator);
 	if (err < 0)
 		goto err_create_indicator_file;

 	err = device_create_file(chip->cdev_indicator.dev, &dev_attr_pattern);
 	if (err < 0)
 		goto err_create_pattern_file;

 	dev_info(&client->dev, "LM3556 is initialized\n");
 	return 0;

 err_create_pattern_file:
 	led_classdev_unregister(&chip->cdev_indicator);
 err_create_indicator_file:
 	led_classdev_unregister(&chip->cdev_torch);
 err_create_torch_file:
 	led_classdev_unregister(&chip->cdev_flash);
 err_out:
 	return err;
 }

 static int __devexit lm3556_remove(struct i2c_client *client)
 {
 	struct lm3556_chip_data *chip = i2c_get_clientdata(client);

 	device_remove_file(chip->cdev_indicator.dev, &dev_attr_pattern);
 	led_classdev_unregister(&chip->cdev_indicator);
 	led_classdev_unregister(&chip->cdev_torch);
 	led_classdev_unregister(&chip->cdev_flash);
 	regmap_write(chip->regmap, REG_ENABLE, 0);
 	return 0;
 }

 static const struct i2c_device_id lm3556_id[] = {
 	{LM3556_NAME, 0},
 	{}
 };

 MODULE_DEVICE_TABLE(i2c, lm3556_id);

 static struct i2c_driver lm3556_i2c_driver = {
 	.driver = {
 		   .name = LM3556_NAME,
 		   .owner = THIS_MODULE,
 		   .pm = NULL,
 		   },
 	.probe = lm3556_probe,
 	.remove = __devexit_p(lm3556_remove),
 	.id_table = lm3556_id,
 };

 module_i2c_driver(lm3556_i2c_driver);

 MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3556");
 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 LM3556 LED Flash driver chip (Rev0x03)
	* 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.
	*
	* Please refer Documentation/leds/leds-lm3556.txt file.
	*/
	#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/platform_data/leds-lm3556.h>

	#define REG_FILT_TIME (0x0)
	#define REG_IVFM_MODE (0x1)
	#define REG_NTC (0x2)
	#define REG_INDIC_TIME (0x3)
	#define REG_INDIC_BLINK (0x4)
	#define REG_INDIC_PERIOD (0x5)
	#define REG_TORCH_TIME (0x6)
	#define REG_CONF (0x7)
	#define REG_FLASH (0x8)
	#define REG_I_CTRL (0x9)
	#define REG_ENABLE (0xA)
	#define REG_FLAG (0xB)
	#define REG_MAX (0xB)

	#define IVFM_FILTER_TIME_SHIFT (3)
	#define UVLO_EN_SHIFT (7)
	#define HYSTERSIS_SHIFT (5)
	#define IVM_D_TH_SHIFT (2)
	#define IVFM_ADJ_MODE_SHIFT (0)
	#define NTC_EVENT_LVL_SHIFT (5)
	#define NTC_TRIP_TH_SHIFT (2)
	#define NTC_BIAS_I_LVL_SHIFT (0)
	#define INDIC_RAMP_UP_TIME_SHIFT (3)
	#define INDIC_RAMP_DN_TIME_SHIFT (0)
	#define INDIC_N_BLANK_SHIFT (4)
	#define INDIC_PULSE_TIME_SHIFT (0)
	#define INDIC_N_PERIOD_SHIFT (0)
	#define TORCH_RAMP_UP_TIME_SHIFT (3)
	#define TORCH_RAMP_DN_TIME_SHIFT (0)
	#define STROBE_USUAGE_SHIFT (7)
	#define STROBE_PIN_POLARITY_SHIFT (6)
	#define TORCH_PIN_POLARITY_SHIFT (5)
	#define TX_PIN_POLARITY_SHIFT (4)
	#define TX_EVENT_LVL_SHIFT (3)
	#define IVFM_EN_SHIFT (2)
	#define NTC_MODE_SHIFT (1)
	#define INDIC_MODE_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 NTC_EN_SHIFT (7)
	#define TX_PIN_EN_SHIFT (6)
	#define STROBE_PIN_EN_SHIFT (5)
	#define TORCH_PIN_EN_SHIFT (4)
	#define PRECHG_MODE_EN_SHIFT (3)
	#define PASS_MODE_ONLY_EN_SHIFT (2)
	#define MODE_BITS_SHIFT (0)

	#define IVFM_FILTER_TIME_MASK (0x3)
	#define UVLO_EN_MASK (0x1)
	#define HYSTERSIS_MASK (0x3)
	#define IVM_D_TH_MASK (0x7)
	#define IVFM_ADJ_MODE_MASK (0x3)
	#define NTC_EVENT_LVL_MASK (0x1)
	#define NTC_TRIP_TH_MASK (0x7)
	#define NTC_BIAS_I_LVL_MASK (0x3)
	#define INDIC_RAMP_UP_TIME_MASK (0x7)
	#define INDIC_RAMP_DN_TIME_MASK (0x7)
	#define INDIC_N_BLANK_MASK (0x7)
	#define INDIC_PULSE_TIME_MASK (0x7)
	#define INDIC_N_PERIOD_MASK (0x7)
	#define TORCH_RAMP_UP_TIME_MASK (0x7)
	#define TORCH_RAMP_DN_TIME_MASK (0x7)
	#define STROBE_USUAGE_MASK (0x1)
	#define STROBE_PIN_POLARITY_MASK (0x1)
	#define TORCH_PIN_POLARITY_MASK (0x1)
	#define TX_PIN_POLARITY_MASK (0x1)
	#define TX_EVENT_LVL_MASK (0x1)
	#define IVFM_EN_MASK (0x1)
	#define NTC_MODE_MASK (0x1)
	#define INDIC_MODE_MASK (0x1)
	#define INDUCTOR_I_LIMIT_MASK (0x3)
	#define FLASH_RAMP_TIME_MASK (0x7)
	#define FLASH_TOUT_TIME_MASK (0x7)
	#define TORCH_I_MASK (0x7)
	#define FLASH_I_MASK (0xF)
	#define NTC_EN_MASK (0x1)
	#define TX_PIN_EN_MASK (0x1)
	#define STROBE_PIN_EN_MASK (0x1)
	#define TORCH_PIN_EN_MASK (0x1)
	#define PRECHG_MODE_EN_MASK (0x1)
	#define PASS_MODE_ONLY_EN_MASK (0x1)
	#define MODE_BITS_MASK (0x13)
	#define EX_PIN_CONTROL_MASK (0xF1)
	#define EX_PIN_ENABLE_MASK (0x70)

	enum lm3556_indic_pulse_time {
	PULSE_TIME_0_MS = 0,
	PULSE_TIME_32_MS,
	PULSE_TIME_64_MS,
	PULSE_TIME_92_MS,
	PULSE_TIME_128_MS,
	PULSE_TIME_160_MS,
	PULSE_TIME_196_MS,
	PULSE_TIME_224_MS,
	PULSE_TIME_256_MS,
	PULSE_TIME_288_MS,
	PULSE_TIME_320_MS,
	PULSE_TIME_352_MS,
	PULSE_TIME_384_MS,
	PULSE_TIME_416_MS,
	PULSE_TIME_448_MS,
	PULSE_TIME_480_MS,
	};

	enum lm3556_indic_n_blank {
	INDIC_N_BLANK_0 = 0,
	INDIC_N_BLANK_1,
	INDIC_N_BLANK_2,
	INDIC_N_BLANK_3,
	INDIC_N_BLANK_4,
	INDIC_N_BLANK_5,
	INDIC_N_BLANK_6,
	INDIC_N_BLANK_7,
	INDIC_N_BLANK_8,
	INDIC_N_BLANK_9,
	INDIC_N_BLANK_10,
	INDIC_N_BLANK_11,
	INDIC_N_BLANK_12,
	INDIC_N_BLANK_13,
	INDIC_N_BLANK_14,
	INDIC_N_BLANK_15,
	};

	enum lm3556_indic_period {
	INDIC_PERIOD_0 = 0,
	INDIC_PERIOD_1,
	INDIC_PERIOD_2,
	INDIC_PERIOD_3,
	INDIC_PERIOD_4,
	INDIC_PERIOD_5,
	INDIC_PERIOD_6,
	INDIC_PERIOD_7,
	};

	enum lm3556_mode {
	MODES_STASNDBY = 0,
	MODES_INDIC,
	MODES_TORCH,
	MODES_FLASH
	};

	#define INDIC_PATTERN_SIZE 4

	struct indicator {
	u8 blinking;
	u8 period_cnt;
	};

	struct lm3556_chip_data {
	struct device *dev;

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

	struct lm3556_platform_data *pdata;
	struct regmap *regmap;
	struct mutex lock;

	unsigned int last_flag;
	};

	/* indicator pattern */
	static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = {
	[0] = {(INDIC_N_BLANK_1 << INDIC_N_BLANK_SHIFT)
	\| PULSE_TIME_32_MS, INDIC_PERIOD_1},
	[1] = {(INDIC_N_BLANK_15 << INDIC_N_BLANK_SHIFT)
	\| PULSE_TIME_32_MS, INDIC_PERIOD_2},
	[2] = {(INDIC_N_BLANK_10 << INDIC_N_BLANK_SHIFT)
	\| PULSE_TIME_32_MS, INDIC_PERIOD_4},
	[3] = {(INDIC_N_BLANK_5 << INDIC_N_BLANK_SHIFT)
	\| PULSE_TIME_32_MS, INDIC_PERIOD_7},
	};

	/* chip initialize */
	static int __devinit lm3556_chip_init(struct lm3556_chip_data *chip)
	{
	unsigned int reg_val;
	int ret;
	struct lm3556_platform_data *pdata = chip->pdata;

	/* set config register */
	ret = regmap_read(chip->regmap, REG_CONF, &reg_val);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to read REG_CONF Register\n");
	goto out;
	}

	reg_val &= (~EX_PIN_CONTROL_MASK);
	reg_val \|= ((pdata->torch_pin_polarity & 0x01)
	<< TORCH_PIN_POLARITY_SHIFT);
	reg_val \|= ((pdata->strobe_usuage & 0x01) << STROBE_USUAGE_SHIFT);
	reg_val \|= ((pdata->strobe_pin_polarity & 0x01)
	<< STROBE_PIN_POLARITY_SHIFT);
	reg_val \|= ((pdata->tx_pin_polarity & 0x01) << TX_PIN_POLARITY_SHIFT);
	reg_val \|= ((pdata->indicator_mode & 0x01) << INDIC_MODE_SHIFT);

	ret = regmap_write(chip->regmap, REG_CONF, reg_val);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to write REG_CONF Regisgter\n");
	goto out;
	}

	/* set enable register */
	ret = regmap_read(chip->regmap, REG_ENABLE, &reg_val);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to read REG_ENABLE Register\n");
	goto out;
	}

	reg_val &= (~EX_PIN_ENABLE_MASK);
	reg_val \|= ((pdata->torch_pin_en & 0x01) << TORCH_PIN_EN_SHIFT);
	reg_val \|= ((pdata->strobe_pin_en & 0x01) << STROBE_PIN_EN_SHIFT);
	reg_val \|= ((pdata->tx_pin_en & 0x01) << TX_PIN_EN_SHIFT);

	ret = regmap_write(chip->regmap, REG_ENABLE, reg_val);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n");
	goto out;
	}

	out:
	return ret;
	}

	/* chip control */
	static int lm3556_control(struct lm3556_chip_data *chip,
	u8 brightness, enum lm3556_mode opmode)
	{
	int ret;
	struct lm3556_platform_data *pdata = chip->pdata;

	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 (pdata->torch_pin_en)
	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);
	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:
	if (pdata->torch_pin_en)
	opmode \|= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
	break;

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

	out:
	return ret;
	}

	/* torch */
	static void lm3556_torch_brightness_set(struct led_classdev *cdev,
	enum led_brightness brightness)
	{
	struct lm3556_chip_data *chip =
	container_of(cdev, struct lm3556_chip_data, cdev_torch);

	mutex_lock(&chip->lock);
	lm3556_control(chip, brightness, MODES_TORCH);
	mutex_unlock(&chip->lock);
	}

	/* flash */
	static void lm3556_strobe_brightness_set(struct led_classdev *cdev,
	enum led_brightness brightness)
	{
	struct lm3556_chip_data *chip =
	container_of(cdev, struct lm3556_chip_data, cdev_flash);

	mutex_lock(&chip->lock);
	lm3556_control(chip, brightness, MODES_FLASH);
	mutex_unlock(&chip->lock);
	}

	/* indicator */
	static void lm3556_indicator_brightness_set(struct led_classdev *cdev,
	enum led_brightness brightness)
	{
	struct lm3556_chip_data *chip =
	container_of(cdev, struct lm3556_chip_data, cdev_indicator);

	mutex_lock(&chip->lock);
	lm3556_control(chip, brightness, MODES_INDIC);
	mutex_unlock(&chip->lock);
	}

	/* indicator pattern */
	static ssize_t lm3556_indicator_pattern_store(struct device *dev,
	struct device_attribute *devAttr,
	const char *buf, size_t size)
	{
	ssize_t ret;
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3556_chip_data *chip =
	container_of(led_cdev, struct lm3556_chip_data, cdev_indicator);
	unsigned int state;

	ret = kstrtouint(buf, 10, &state);
	if (ret)
	goto out;
	if (state > INDIC_PATTERN_SIZE - 1)
	state = INDIC_PATTERN_SIZE - 1;

	ret = regmap_write(chip->regmap, REG_INDIC_BLINK,
	indicator_pattern[state].blinking);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n");
	goto out;
	}

	ret = regmap_write(chip->regmap, REG_INDIC_PERIOD,
	indicator_pattern[state].period_cnt);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n");
	goto out;
	}

	return size;
	out:
	dev_err(chip->dev, "Indicator pattern doesn't saved\n");
	return size;
	}

	static DEVICE_ATTR(pattern, 0666, NULL, lm3556_indicator_pattern_store);

	static const struct regmap_config lm3556_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = REG_MAX,
	};

	/* module initialize */
	static int __devinit lm3556_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct lm3556_platform_data *pdata = client->dev.platform_data;
	struct lm3556_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 lm3556_chip_data),
	GFP_KERNEL);
	if (!chip)
	return -ENOMEM;

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

	chip->regmap = devm_regmap_init_i2c(client, &lm3556_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 = lm3556_chip_init(chip);
	if (err < 0)
	goto err_out;

	/* flash */
	chip->cdev_flash.name = "flash";
	chip->cdev_flash.max_brightness = 16;
	chip->cdev_flash.brightness_set = lm3556_strobe_brightness_set;
	err = led_classdev_register((struct device *)
	&client->dev, &chip->cdev_flash);
	if (err < 0)
	goto err_out;
	/* torch */
	chip->cdev_torch.name = "torch";
	chip->cdev_torch.max_brightness = 8;
	chip->cdev_torch.brightness_set = lm3556_torch_brightness_set;
	err = led_classdev_register((struct device *)
	&client->dev, &chip->cdev_torch);
	if (err < 0)
	goto err_create_torch_file;
	/* indicator */
	chip->cdev_indicator.name = "indicator";
	chip->cdev_indicator.max_brightness = 8;
	chip->cdev_indicator.brightness_set = lm3556_indicator_brightness_set;
	err = led_classdev_register((struct device *)
	&client->dev, &chip->cdev_indicator);
	if (err < 0)
	goto err_create_indicator_file;

	err = device_create_file(chip->cdev_indicator.dev, &dev_attr_pattern);
	if (err < 0)
	goto err_create_pattern_file;

	dev_info(&client->dev, "LM3556 is initialized\n");
	return 0;

	err_create_pattern_file:
	led_classdev_unregister(&chip->cdev_indicator);
	err_create_indicator_file:
	led_classdev_unregister(&chip->cdev_torch);
	err_create_torch_file:
	led_classdev_unregister(&chip->cdev_flash);
	err_out:
	return err;
	}

	static int __devexit lm3556_remove(struct i2c_client *client)
	{
	struct lm3556_chip_data *chip = i2c_get_clientdata(client);

	device_remove_file(chip->cdev_indicator.dev, &dev_attr_pattern);
	led_classdev_unregister(&chip->cdev_indicator);
	led_classdev_unregister(&chip->cdev_torch);
	led_classdev_unregister(&chip->cdev_flash);
	regmap_write(chip->regmap, REG_ENABLE, 0);
	return 0;
	}

	static const struct i2c_device_id lm3556_id[] = {
	{LM3556_NAME, 0},
	{}
	};

	MODULE_DEVICE_TABLE(i2c, lm3556_id);

	static struct i2c_driver lm3556_i2c_driver = {
	.driver = {
	.name = LM3556_NAME,
	.owner = THIS_MODULE,
	.pm = NULL,
	},
	.probe = lm3556_probe,
	.remove = __devexit_p(lm3556_remove),
	.id_table = lm3556_id,
	};

	module_i2c_driver(lm3556_i2c_driver);

	MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3556");
	MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
	MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
	MODULE_LICENSE("GPL v2");