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Commit 32abb478 authored by G.Shark Jeong's avatar G.Shark Jeong Committed by Bryan Wu
Browse files

leds: Add LED driver for lm3556 chip 



LM3556 :
The LM3556 is a 4 MHz fixed-frequency synchronous boost
converter plus 1.5A constant current driver for a high-current white LED.
Datasheet: www.national.com/ds/LM/LM3556.pdf

Tested on OMAP4430

(bryan.wu@canonical.com: use module_i2c_driver() rather than
lm3556_init/lm3556_exit for code simplicity; fixed some typo
pointed out by Rob Landley)

Signed-off-by: default avatarG.Shark Jeong <gshark.jeong@gmail.com>
Reviewed-by: default avatarAxel Lin <axel.lin@gmail.com>
Reviewed-by: default avatarKim, Milo <Milo.Kim@ti.com>
Acked-by: default avatarRob Landley <rob@landley.net>
Signed-off-by: default avatarBryan Wu <bryan.wu@canonical.com>
parent 1522d02e

Documentation/leds/00-INDEX

+2 −0
Original line number Original line Diff line number Diff line
@@ -6,3 +6,5 @@ leds-lp5521.txt 
	- notes on how to use the leds-lp5521 driver.

	- notes on how to use the leds-lp5521 driver.

leds-lp5523.txt

leds-lp5523.txt

	- notes on how to use the leds-lp5523 driver.

	- notes on how to use the leds-lp5523 driver.

leds-lm3556.txt

	- notes on how to use the leds-lm3556 driver.

Documentation/leds/leds-lm3556.txt

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+85 −0
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Kernel driver for lm3556

========================



*Texas Instrument:

 1.5 A Synchronous Boost LED Flash Driver w/ High-Side Current Source

* Datasheet: http://www.national.com/ds/LM/LM3556.pdf



Authors:

	Daniel Jeong

	Contact:Daniel Jeong(daniel.jeong-at-ti.com, gshark.jeong-at-gmail.com)



Description

-----------

There are 3 functions in LM3556, Flash, Torch and Indicator.



FLASH MODE

In Flash Mode, the LED current source(LED) provides 16 target current levels

from 93.75 mA to 1500 mA.The Flash currents are adjusted via the CURRENT

CONTROL REGISTER(0x09).Flash mode is activated by the ENABLE REGISTER(0x0A),

or by pulling the STROBE pin HIGH.

LM3556 Flash can be controlled through sys/class/leds/flash/brightness file

* if STROBE pin is enabled, below example control brightness only, and

ON / OFF will be controlled by STROBE pin.



Flash Example:

OFF     : #echo 0 > sys/class/leds/flash/brightness

93.75 mA: #echo 1 > sys/class/leds/flash/brightness

... .....

1500  mA: #echo 16 > sys/class/leds/flash/brightness



TORCH MODE

In Torch Mode, the current source(LED) is programmed via the CURRENT CONTROL

REGISTER(0x09).Torch Mode is activated by the ENABLE REGISTER(0x0A) or by the

hardware TORCH input.

LM3556 torch can be controlled through sys/class/leds/torch/brightness file.

* if TORCH pin is enabled, below example control brightness only,

and ON / OFF will be controlled by TORCH pin.



Torch Example:

OFF     : #echo 0 > sys/class/leds/torch/brightness

46.88 mA: #echo 1 > sys/class/leds/torch/brightness

... .....

375 mA  : #echo 8 > sys/class/leds/torch/brightness



INDICATOR MODE

Indicator pattern can be set through sys/class/leds/indicator/pattern file,

and 4 patterns are pre-defined in indicator_pattern array.

According to N-lank, Pulse time and N Period values, different pattern wiill

be generated.If you want new patterns for your own device, change

indicator_pattern array with your own values and INDIC_PATTERN_SIZE.

Please refer datasheet for more detail about N-Blank, Pulse time and N Period.



Indicator pattern example:

pattern 0: #echo 0 > sys/class/leds/indicator/pattern

....

pattern 3: #echo 3 > sys/class/leds/indicator/pattern



Indicator brightness can be controlled through

sys/class/leds/indicator/brightness file.



Example:

OFF      : #echo 0 > sys/class/leds/indicator/brightness

5.86 mA  : #echo 1 > sys/class/leds/indicator/brightness

........

46.875mA : #echo 8 > sys/class/leds/indicator/brightness



Notes

-----

Driver expects it is registered using the i2c_board_info mechanism.

To register the chip at address 0x63 on specific adapter, set the platform data

according to include/linux/platform_data/leds-lm3556.h, set the i2c board info



Example:

	static struct i2c_board_info __initdata board_i2c_ch4[]	= {

		{

			 I2C_BOARD_INFO(LM3556_NAME, 0x63),

			 .platform_data = &lm3556_pdata,

		 },

	};



and register it in the platform init function



Example:

	board_register_i2c_bus(4, 400,

				board_i2c_ch4, ARRAY_SIZE(board_i2c_ch4));

drivers/leds/Kconfig

+8 −0
Original line number Original line Diff line number Diff line
@@ -415,6 +415,14 @@ config LEDS_MAX8997 
	  This option enables support for on-chip LED drivers on

	  This option enables support for on-chip LED drivers on

	  MAXIM MAX8997 PMIC.

	  MAXIM MAX8997 PMIC.





config LEDS_LM3556

	tristate "LED support for LM3556 Chip"

	depends on LEDS_CLASS && I2C

	select REGMAP_I2C

	help

	  This option enables support for LEDs connected to LM3556.

	  LM3556 includes Torch, Flash and Indicator functions.



config LEDS_OT200

config LEDS_OT200

	tristate "LED support for the Bachmann OT200"

	tristate "LED support for the Bachmann OT200"

	depends on LEDS_CLASS && HAS_IOMEM

	depends on LEDS_CLASS && HAS_IOMEM

drivers/leds/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -47,6 +47,7 @@ obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o 
obj-$(CONFIG_LEDS_ASIC3)		+= leds-asic3.o

obj-$(CONFIG_LEDS_ASIC3)		+= leds-asic3.o

obj-$(CONFIG_LEDS_RENESAS_TPU)		+= leds-renesas-tpu.o

obj-$(CONFIG_LEDS_RENESAS_TPU)		+= leds-renesas-tpu.o

obj-$(CONFIG_LEDS_MAX8997)		+= leds-max8997.o

obj-$(CONFIG_LEDS_MAX8997)		+= leds-max8997.o

obj-$(CONFIG_LEDS_LM3556)		+= leds-lm3556.o





# LED SPI Drivers

# LED SPI Drivers

obj-$(CONFIG_LEDS_DAC124S085)		+= leds-dac124s085.o

obj-$(CONFIG_LEDS_DAC124S085)		+= leds-dac124s085.o

drivers/leds/leds-lm3556.c

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/*

 * 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");