drivers/leds/leds-lm355x.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
 * Simple driver for Texas Instruments LM355x LED Flash driver chip
 * Copyright (C) 2012 Texas Instruments
 */

 #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-lm355x.h>

 enum lm355x_type {
 	CHIP_LM3554 = 0,
 	CHIP_LM3556,
 };

 enum lm355x_regs {
 	REG_FLAG = 0,
 	REG_TORCH_CFG,
 	REG_TORCH_CTRL,
 	REG_STROBE_CFG,
 	REG_FLASH_CTRL,
 	REG_INDI_CFG,
 	REG_INDI_CTRL,
 	REG_OPMODE,
 	REG_MAX,
 };

 /* operation mode */
 enum lm355x_mode {
 	MODE_SHDN = 0,
 	MODE_INDIC,
 	MODE_TORCH,
 	MODE_FLASH
 };

 /* register map info. */
 struct lm355x_reg_data {
 	u8 regno;
 	u8 mask;
 	u8 shift;
 };

 struct lm355x_chip_data {
 	struct device *dev;
 	enum lm355x_type type;

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

 	struct lm355x_platform_data *pdata;
 	struct regmap *regmap;
 	struct mutex lock;

 	unsigned int last_flag;
 	struct lm355x_reg_data *regs;
 };

 /* specific indicator function for lm3556 */
 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,
 };

 #define INDIC_PATTERN_SIZE 4

 struct indicator {
 	u8 blinking;
 	u8 period_cnt;
 };

 /* indicator pattern data only for lm3556 */
 static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = {
 	[0] = {(INDIC_N_BLANK_1 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_1},
 	[1] = {(INDIC_N_BLANK_15 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_2},
 	[2] = {(INDIC_N_BLANK_10 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_4},
 	[3] = {(INDIC_N_BLANK_5 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_7},
 };

 static struct lm355x_reg_data lm3554_regs[REG_MAX] = {
 	[REG_FLAG] = {0xD0, 0xBF, 0},
 	[REG_TORCH_CFG] = {0xE0, 0x80, 7},
 	[REG_TORCH_CTRL] = {0xA0, 0x38, 3},
 	[REG_STROBE_CFG] = {0xE0, 0x04, 2},
 	[REG_FLASH_CTRL] = {0xB0, 0x78, 3},
 	[REG_INDI_CFG] = {0xE0, 0x08, 3},
 	[REG_INDI_CTRL] = {0xA0, 0xC0, 6},
 	[REG_OPMODE] = {0xA0, 0x03, 0},
 };

 static struct lm355x_reg_data lm3556_regs[REG_MAX] = {
 	[REG_FLAG] = {0x0B, 0xFF, 0},
 	[REG_TORCH_CFG] = {0x0A, 0x10, 4},
 	[REG_TORCH_CTRL] = {0x09, 0x70, 4},
 	[REG_STROBE_CFG] = {0x0A, 0x20, 5},
 	[REG_FLASH_CTRL] = {0x09, 0x0F, 0},
 	[REG_INDI_CFG] = {0xFF, 0xFF, 0},
 	[REG_INDI_CTRL] = {0x09, 0x70, 4},
 	[REG_OPMODE] = {0x0A, 0x03, 0},
 };

 static char lm355x_name[][I2C_NAME_SIZE] = {
 	[CHIP_LM3554] = LM3554_NAME,
 	[CHIP_LM3556] = LM3556_NAME,
 };

 /* chip initialize */
 static int lm355x_chip_init(struct lm355x_chip_data *chip)
 {
 	int ret;
 	unsigned int reg_val;
 	struct lm355x_platform_data *pdata = chip->pdata;

 	/* input and output pins configuration */
 	switch (chip->type) {
 	case CHIP_LM3554:
 		reg_val = pdata->pin_tx2 | pdata->ntc_pin;
 		ret = regmap_update_bits(chip->regmap, 0xE0, 0x28, reg_val);
 		if (ret < 0)
 			goto out;
 		reg_val = pdata->pass_mode;
 		ret = regmap_update_bits(chip->regmap, 0xA0, 0x04, reg_val);
 		if (ret < 0)
 			goto out;
 		break;

 	case CHIP_LM3556:
 		reg_val = pdata->pin_tx2 | pdata->ntc_pin | pdata->pass_mode;
 		ret = regmap_update_bits(chip->regmap, 0x0A, 0xC4, reg_val);
 		if (ret < 0)
 			goto out;
 		break;
 	default:
 		return -ENODATA;
 	}

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

 /* chip control */
 static int lm355x_control(struct lm355x_chip_data *chip,
 			   u8 brightness, enum lm355x_mode opmode)
 {
 	int ret;
 	unsigned int reg_val;
 	struct lm355x_platform_data *pdata = chip->pdata;
 	struct lm355x_reg_data *preg = chip->regs;

 	ret = regmap_read(chip->regmap, preg[REG_FLAG].regno, &chip->last_flag);
 	if (ret < 0)
 		goto out;
 	if (chip->last_flag & preg[REG_FLAG].mask)
 		dev_info(chip->dev, "%s Last FLAG is 0x%x\n",
 			 lm355x_name[chip->type],
 			 chip->last_flag & preg[REG_FLAG].mask);
 	/* brightness 0 means shutdown */
 	if (!brightness)
 		opmode = MODE_SHDN;

 	switch (opmode) {
 	case MODE_TORCH:
 		ret =
 		    regmap_update_bits(chip->regmap, preg[REG_TORCH_CTRL].regno,
 				       preg[REG_TORCH_CTRL].mask,
 				       (brightness - 1)
 				       << preg[REG_TORCH_CTRL].shift);
 		if (ret < 0)
 			goto out;

 		if (pdata->pin_tx1 != LM355x_PIN_TORCH_DISABLE) {
 			ret =
 			    regmap_update_bits(chip->regmap,
 					       preg[REG_TORCH_CFG].regno,
 					       preg[REG_TORCH_CFG].mask,
 					       0x01 <<
 					       preg[REG_TORCH_CFG].shift);
 			if (ret < 0)
 				goto out;
 			opmode = MODE_SHDN;
 			dev_info(chip->dev,
 				 "torch brt is set - ext. torch pin mode\n");
 		}
 		break;

 	case MODE_FLASH:

 		ret =
 		    regmap_update_bits(chip->regmap, preg[REG_FLASH_CTRL].regno,
 				       preg[REG_FLASH_CTRL].mask,
 				       (brightness - 1)
 				       << preg[REG_FLASH_CTRL].shift);
 		if (ret < 0)
 			goto out;

 		if (pdata->pin_strobe != LM355x_PIN_STROBE_DISABLE) {
 			if (chip->type == CHIP_LM3554)
 				reg_val = 0x00;
 			else
 				reg_val = 0x01;
 			ret =
 			    regmap_update_bits(chip->regmap,
 					       preg[REG_STROBE_CFG].regno,
 					       preg[REG_STROBE_CFG].mask,
 					       reg_val <<
 					       preg[REG_STROBE_CFG].shift);
 			if (ret < 0)
 				goto out;
 			opmode = MODE_SHDN;
 			dev_info(chip->dev,
 				 "flash brt is set - ext. strobe pin mode\n");
 		}
 		break;

 	case MODE_INDIC:
 		ret =
 		    regmap_update_bits(chip->regmap, preg[REG_INDI_CTRL].regno,
 				       preg[REG_INDI_CTRL].mask,
 				       (brightness - 1)
 				       << preg[REG_INDI_CTRL].shift);
 		if (ret < 0)
 			goto out;

 		if (pdata->pin_tx2 != LM355x_PIN_TX_DISABLE) {
 			ret =
 			    regmap_update_bits(chip->regmap,
 					       preg[REG_INDI_CFG].regno,
 					       preg[REG_INDI_CFG].mask,
 					       0x01 <<
 					       preg[REG_INDI_CFG].shift);
 			if (ret < 0)
 				goto out;
 			opmode = MODE_SHDN;
 		}
 		break;
 	case MODE_SHDN:
 		break;
 	default:
 		return -EINVAL;
 	}
 	/* operation mode control */
 	ret = regmap_update_bits(chip->regmap, preg[REG_OPMODE].regno,
 				 preg[REG_OPMODE].mask,
 				 opmode << preg[REG_OPMODE].shift);
 	if (ret < 0)
 		goto out;
 	return ret;
 out:
 	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
 	return ret;
 }

 /* torch */

 static int lm355x_torch_brightness_set(struct led_classdev *cdev,
 					enum led_brightness brightness)
 {
 	struct lm355x_chip_data *chip =
 	    container_of(cdev, struct lm355x_chip_data, cdev_torch);
 	int ret;

 	mutex_lock(&chip->lock);
 	ret = lm355x_control(chip, brightness, MODE_TORCH);
 	mutex_unlock(&chip->lock);
 	return ret;
 }

 /* flash */

 static int lm355x_strobe_brightness_set(struct led_classdev *cdev,
 					 enum led_brightness brightness)
 {
 	struct lm355x_chip_data *chip =
 	    container_of(cdev, struct lm355x_chip_data, cdev_flash);
 	int ret;

 	mutex_lock(&chip->lock);
 	ret = lm355x_control(chip, brightness, MODE_FLASH);
 	mutex_unlock(&chip->lock);
 	return ret;
 }

 /* indicator */

 static int lm355x_indicator_brightness_set(struct led_classdev *cdev,
 					    enum led_brightness brightness)
 {
 	struct lm355x_chip_data *chip =
 	    container_of(cdev, struct lm355x_chip_data, cdev_indicator);
 	int ret;

 	mutex_lock(&chip->lock);
 	ret = lm355x_control(chip, brightness, MODE_INDIC);
 	mutex_unlock(&chip->lock);
 	return ret;
 }

 /* indicator pattern only for lm3556*/
 static ssize_t lm3556_indicator_pattern_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 lm355x_chip_data *chip =
 	    container_of(led_cdev, struct lm355x_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, 0x04,
 			   indicator_pattern[state].blinking);
 	if (ret < 0)
 		goto out;

 	ret = regmap_write(chip->regmap, 0x05,
 			   indicator_pattern[state].period_cnt);
 	if (ret < 0)
 		goto out;

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

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

 static struct attribute *lm355x_indicator_attrs[] = {
 	&dev_attr_pattern.attr,
 	NULL
 };
 ATTRIBUTE_GROUPS(lm355x_indicator);

 static const struct regmap_config lm355x_regmap = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = 0xFF,
 };

 /* module initialize */
 static int lm355x_probe(struct i2c_client *client,
 				  const struct i2c_device_id *id)
 {
 	struct lm355x_platform_data *pdata = dev_get_platdata(&client->dev);
 	struct lm355x_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 lm355x_chip_data), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;

 	chip->dev = &client->dev;
 	chip->type = id->driver_data;
 	switch (id->driver_data) {
 	case CHIP_LM3554:
 		chip->regs = lm3554_regs;
 		break;
 	case CHIP_LM3556:
 		chip->regs = lm3556_regs;
 		break;
 	default:
 		return -ENOSYS;
 	}
 	chip->pdata = pdata;

 	chip->regmap = devm_regmap_init_i2c(client, &lm355x_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 = lm355x_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_blocking = lm355x_strobe_brightness_set;
 	chip->cdev_flash.default_trigger = "flash";
 	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_blocking = lm355x_torch_brightness_set;
 	chip->cdev_torch.default_trigger = "torch";
 	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";
 	if (id->driver_data == CHIP_LM3554)
 		chip->cdev_indicator.max_brightness = 4;
 	else
 		chip->cdev_indicator.max_brightness = 8;
 	chip->cdev_indicator.brightness_set_blocking =
 					lm355x_indicator_brightness_set;
 	/* indicator pattern control only for LM3556 */
 	if (id->driver_data == CHIP_LM3556)
 		chip->cdev_indicator.groups = lm355x_indicator_groups;
 	err = led_classdev_register((struct device *)
 				    &client->dev, &chip->cdev_indicator);
 	if (err < 0)
 		goto err_create_indicator_file;

 	dev_info(&client->dev, "%s is initialized\n",
 		 lm355x_name[id->driver_data]);
 	return 0;

 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 lm355x_remove(struct i2c_client *client)
 {
 	struct lm355x_chip_data *chip = i2c_get_clientdata(client);
 	struct lm355x_reg_data *preg = chip->regs;

 	regmap_write(chip->regmap, preg[REG_OPMODE].regno, 0);
 	led_classdev_unregister(&chip->cdev_indicator);
 	led_classdev_unregister(&chip->cdev_torch);
 	led_classdev_unregister(&chip->cdev_flash);
 	dev_info(&client->dev, "%s is removed\n", lm355x_name[chip->type]);

 	return 0;
 }

 static const struct i2c_device_id lm355x_id[] = {
 	{LM3554_NAME, CHIP_LM3554},
 	{LM3556_NAME, CHIP_LM3556},
 	{}
 };

 MODULE_DEVICE_TABLE(i2c, lm355x_id);

 static struct i2c_driver lm355x_i2c_driver = {
 	.driver = {
 		   .name = LM355x_NAME,
 		   .pm = NULL,
 		   },
 	.probe = lm355x_probe,
 	.remove = lm355x_remove,
 	.id_table = lm355x_id,
 };

 module_i2c_driver(lm355x_i2c_driver);

 MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM355x");
 MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
 MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Simple driver for Texas Instruments LM355x LED Flash driver chip
	* Copyright (C) 2012 Texas Instruments
	*/

	#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-lm355x.h>

	enum lm355x_type {
	CHIP_LM3554 = 0,
	CHIP_LM3556,
	};

	enum lm355x_regs {
	REG_FLAG = 0,
	REG_TORCH_CFG,
	REG_TORCH_CTRL,
	REG_STROBE_CFG,
	REG_FLASH_CTRL,
	REG_INDI_CFG,
	REG_INDI_CTRL,
	REG_OPMODE,
	REG_MAX,
	};

	/* operation mode */
	enum lm355x_mode {
	MODE_SHDN = 0,
	MODE_INDIC,
	MODE_TORCH,
	MODE_FLASH
	};

	/* register map info. */
	struct lm355x_reg_data {
	u8 regno;
	u8 mask;
	u8 shift;
	};

	struct lm355x_chip_data {
	struct device *dev;
	enum lm355x_type type;

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

	struct lm355x_platform_data *pdata;
	struct regmap *regmap;
	struct mutex lock;

	unsigned int last_flag;
	struct lm355x_reg_data *regs;
	};

	/* specific indicator function for lm3556 */
	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,
	};

	#define INDIC_PATTERN_SIZE 4

	struct indicator {
	u8 blinking;
	u8 period_cnt;
	};

	/* indicator pattern data only for lm3556 */
	static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = {
	[0] = {(INDIC_N_BLANK_1 << 4) \| PULSE_TIME_32_MS, INDIC_PERIOD_1},
	[1] = {(INDIC_N_BLANK_15 << 4) \| PULSE_TIME_32_MS, INDIC_PERIOD_2},
	[2] = {(INDIC_N_BLANK_10 << 4) \| PULSE_TIME_32_MS, INDIC_PERIOD_4},
	[3] = {(INDIC_N_BLANK_5 << 4) \| PULSE_TIME_32_MS, INDIC_PERIOD_7},
	};

	static struct lm355x_reg_data lm3554_regs[REG_MAX] = {
	[REG_FLAG] = {0xD0, 0xBF, 0},
	[REG_TORCH_CFG] = {0xE0, 0x80, 7},
	[REG_TORCH_CTRL] = {0xA0, 0x38, 3},
	[REG_STROBE_CFG] = {0xE0, 0x04, 2},
	[REG_FLASH_CTRL] = {0xB0, 0x78, 3},
	[REG_INDI_CFG] = {0xE0, 0x08, 3},
	[REG_INDI_CTRL] = {0xA0, 0xC0, 6},
	[REG_OPMODE] = {0xA0, 0x03, 0},
	};

	static struct lm355x_reg_data lm3556_regs[REG_MAX] = {
	[REG_FLAG] = {0x0B, 0xFF, 0},
	[REG_TORCH_CFG] = {0x0A, 0x10, 4},
	[REG_TORCH_CTRL] = {0x09, 0x70, 4},
	[REG_STROBE_CFG] = {0x0A, 0x20, 5},
	[REG_FLASH_CTRL] = {0x09, 0x0F, 0},
	[REG_INDI_CFG] = {0xFF, 0xFF, 0},
	[REG_INDI_CTRL] = {0x09, 0x70, 4},
	[REG_OPMODE] = {0x0A, 0x03, 0},
	};

	static char lm355x_name[][I2C_NAME_SIZE] = {
	[CHIP_LM3554] = LM3554_NAME,
	[CHIP_LM3556] = LM3556_NAME,
	};

	/* chip initialize */
	static int lm355x_chip_init(struct lm355x_chip_data *chip)
	{
	int ret;
	unsigned int reg_val;
	struct lm355x_platform_data *pdata = chip->pdata;

	/* input and output pins configuration */
	switch (chip->type) {
	case CHIP_LM3554:
	reg_val = pdata->pin_tx2 \| pdata->ntc_pin;
	ret = regmap_update_bits(chip->regmap, 0xE0, 0x28, reg_val);
	if (ret < 0)
	goto out;
	reg_val = pdata->pass_mode;
	ret = regmap_update_bits(chip->regmap, 0xA0, 0x04, reg_val);
	if (ret < 0)
	goto out;
	break;

	case CHIP_LM3556:
	reg_val = pdata->pin_tx2 \| pdata->ntc_pin \| pdata->pass_mode;
	ret = regmap_update_bits(chip->regmap, 0x0A, 0xC4, reg_val);
	if (ret < 0)
	goto out;
	break;
	default:
	return -ENODATA;
	}

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

	/* chip control */
	static int lm355x_control(struct lm355x_chip_data *chip,
	u8 brightness, enum lm355x_mode opmode)
	{
	int ret;
	unsigned int reg_val;
	struct lm355x_platform_data *pdata = chip->pdata;
	struct lm355x_reg_data *preg = chip->regs;

	ret = regmap_read(chip->regmap, preg[REG_FLAG].regno, &chip->last_flag);
	if (ret < 0)
	goto out;
	if (chip->last_flag & preg[REG_FLAG].mask)
	dev_info(chip->dev, "%s Last FLAG is 0x%x\n",
	lm355x_name[chip->type],
	chip->last_flag & preg[REG_FLAG].mask);
	/* brightness 0 means shutdown */
	if (!brightness)
	opmode = MODE_SHDN;

	switch (opmode) {
	case MODE_TORCH:
	ret =
	regmap_update_bits(chip->regmap, preg[REG_TORCH_CTRL].regno,
	preg[REG_TORCH_CTRL].mask,
	(brightness - 1)
	<< preg[REG_TORCH_CTRL].shift);
	if (ret < 0)
	goto out;

	if (pdata->pin_tx1 != LM355x_PIN_TORCH_DISABLE) {
	ret =
	regmap_update_bits(chip->regmap,
	preg[REG_TORCH_CFG].regno,
	preg[REG_TORCH_CFG].mask,
	0x01 <<
	preg[REG_TORCH_CFG].shift);
	if (ret < 0)
	goto out;
	opmode = MODE_SHDN;
	dev_info(chip->dev,
	"torch brt is set - ext. torch pin mode\n");
	}
	break;

	case MODE_FLASH:

	ret =
	regmap_update_bits(chip->regmap, preg[REG_FLASH_CTRL].regno,
	preg[REG_FLASH_CTRL].mask,
	(brightness - 1)
	<< preg[REG_FLASH_CTRL].shift);
	if (ret < 0)
	goto out;

	if (pdata->pin_strobe != LM355x_PIN_STROBE_DISABLE) {
	if (chip->type == CHIP_LM3554)
	reg_val = 0x00;
	else
	reg_val = 0x01;
	ret =
	regmap_update_bits(chip->regmap,
	preg[REG_STROBE_CFG].regno,
	preg[REG_STROBE_CFG].mask,
	reg_val <<
	preg[REG_STROBE_CFG].shift);
	if (ret < 0)
	goto out;
	opmode = MODE_SHDN;
	dev_info(chip->dev,
	"flash brt is set - ext. strobe pin mode\n");
	}
	break;

	case MODE_INDIC:
	ret =
	regmap_update_bits(chip->regmap, preg[REG_INDI_CTRL].regno,
	preg[REG_INDI_CTRL].mask,
	(brightness - 1)
	<< preg[REG_INDI_CTRL].shift);
	if (ret < 0)
	goto out;

	if (pdata->pin_tx2 != LM355x_PIN_TX_DISABLE) {
	ret =
	regmap_update_bits(chip->regmap,
	preg[REG_INDI_CFG].regno,
	preg[REG_INDI_CFG].mask,
	0x01 <<
	preg[REG_INDI_CFG].shift);
	if (ret < 0)
	goto out;
	opmode = MODE_SHDN;
	}
	break;
	case MODE_SHDN:
	break;
	default:
	return -EINVAL;
	}
	/* operation mode control */
	ret = regmap_update_bits(chip->regmap, preg[REG_OPMODE].regno,
	preg[REG_OPMODE].mask,
	opmode << preg[REG_OPMODE].shift);
	if (ret < 0)
	goto out;
	return ret;
	out:
	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
	return ret;
	}

	/* torch */

	static int lm355x_torch_brightness_set(struct led_classdev *cdev,
	enum led_brightness brightness)
	{
	struct lm355x_chip_data *chip =
	container_of(cdev, struct lm355x_chip_data, cdev_torch);
	int ret;

	mutex_lock(&chip->lock);
	ret = lm355x_control(chip, brightness, MODE_TORCH);
	mutex_unlock(&chip->lock);
	return ret;
	}

	/* flash */

	static int lm355x_strobe_brightness_set(struct led_classdev *cdev,
	enum led_brightness brightness)
	{
	struct lm355x_chip_data *chip =
	container_of(cdev, struct lm355x_chip_data, cdev_flash);
	int ret;

	mutex_lock(&chip->lock);
	ret = lm355x_control(chip, brightness, MODE_FLASH);
	mutex_unlock(&chip->lock);
	return ret;
	}

	/* indicator */

	static int lm355x_indicator_brightness_set(struct led_classdev *cdev,
	enum led_brightness brightness)
	{
	struct lm355x_chip_data *chip =
	container_of(cdev, struct lm355x_chip_data, cdev_indicator);
	int ret;

	mutex_lock(&chip->lock);
	ret = lm355x_control(chip, brightness, MODE_INDIC);
	mutex_unlock(&chip->lock);
	return ret;
	}

	/* indicator pattern only for lm3556*/
	static ssize_t lm3556_indicator_pattern_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 lm355x_chip_data *chip =
	container_of(led_cdev, struct lm355x_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, 0x04,
	indicator_pattern[state].blinking);
	if (ret < 0)
	goto out;

	ret = regmap_write(chip->regmap, 0x05,
	indicator_pattern[state].period_cnt);
	if (ret < 0)
	goto out;

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

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

	static struct attribute *lm355x_indicator_attrs[] = {
	&dev_attr_pattern.attr,
	NULL
	};
	ATTRIBUTE_GROUPS(lm355x_indicator);

	static const struct regmap_config lm355x_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 0xFF,
	};

	/* module initialize */
	static int lm355x_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct lm355x_platform_data *pdata = dev_get_platdata(&client->dev);
	struct lm355x_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 lm355x_chip_data), GFP_KERNEL);
	if (!chip)
	return -ENOMEM;

	chip->dev = &client->dev;
	chip->type = id->driver_data;
	switch (id->driver_data) {
	case CHIP_LM3554:
	chip->regs = lm3554_regs;
	break;
	case CHIP_LM3556:
	chip->regs = lm3556_regs;
	break;
	default:
	return -ENOSYS;
	}
	chip->pdata = pdata;

	chip->regmap = devm_regmap_init_i2c(client, &lm355x_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 = lm355x_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_blocking = lm355x_strobe_brightness_set;
	chip->cdev_flash.default_trigger = "flash";
	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_blocking = lm355x_torch_brightness_set;
	chip->cdev_torch.default_trigger = "torch";
	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";
	if (id->driver_data == CHIP_LM3554)
	chip->cdev_indicator.max_brightness = 4;
	else
	chip->cdev_indicator.max_brightness = 8;
	chip->cdev_indicator.brightness_set_blocking =
	lm355x_indicator_brightness_set;
	/* indicator pattern control only for LM3556 */
	if (id->driver_data == CHIP_LM3556)
	chip->cdev_indicator.groups = lm355x_indicator_groups;
	err = led_classdev_register((struct device *)
	&client->dev, &chip->cdev_indicator);
	if (err < 0)
	goto err_create_indicator_file;

	dev_info(&client->dev, "%s is initialized\n",
	lm355x_name[id->driver_data]);
	return 0;

	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 lm355x_remove(struct i2c_client *client)
	{
	struct lm355x_chip_data *chip = i2c_get_clientdata(client);
	struct lm355x_reg_data *preg = chip->regs;

	regmap_write(chip->regmap, preg[REG_OPMODE].regno, 0);
	led_classdev_unregister(&chip->cdev_indicator);
	led_classdev_unregister(&chip->cdev_torch);
	led_classdev_unregister(&chip->cdev_flash);
	dev_info(&client->dev, "%s is removed\n", lm355x_name[chip->type]);

	return 0;
	}

	static const struct i2c_device_id lm355x_id[] = {
	{LM3554_NAME, CHIP_LM3554},
	{LM3556_NAME, CHIP_LM3556},
	{}
	};

	MODULE_DEVICE_TABLE(i2c, lm355x_id);

	static struct i2c_driver lm355x_i2c_driver = {
	.driver = {
	.name = LM355x_NAME,
	.pm = NULL,
	},
	.probe = lm355x_probe,
	.remove = lm355x_remove,
	.id_table = lm355x_id,
	};

	module_i2c_driver(lm355x_i2c_driver);

	MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM355x");
	MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
	MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
	MODULE_LICENSE("GPL v2");