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    Subject[PATCH 1/1 v4] leds: Add LED driver for lm3556 chip
    Date
    From: "G.Shark Jeong" <gshark.jeong@gmail.com>

    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

    Signed-off-by: G.Shark Jeong <gshark.jeong@gmail.com>
    ---
    Documentation/leds/00-INDEX | 2 +
    Documentation/leds/leds-lm3556.txt | 85 +++++
    drivers/leds/Kconfig | 8 +
    drivers/leds/Makefile | 1 +
    drivers/leds/leds-lm3556.c | 523 +++++++++++++++++++++++++++++
    include/linux/platform_data/leds-lm3556.h | 50 +++
    6 files changed, 669 insertions(+), 0 deletions(-)
    create mode 100644 Documentation/leds/leds-lm3556.txt
    create mode 100644 drivers/leds/leds-lm3556.c
    create mode 100644 include/linux/platform_data/leds-lm3556.h

    diff --git a/Documentation/leds/00-INDEX b/Documentation/leds/00-INDEX
    index 29f481d..5fefe37 100644
    --- a/Documentation/leds/00-INDEX
    +++ b/Documentation/leds/00-INDEX
    @@ -6,3 +6,5 @@ leds-lp5521.txt
    - notes on how to use the leds-lp5521 driver.
    leds-lp5523.txt
    - notes on how to use the leds-lp5523 driver.
    +leds-lm3556.txt
    + - notes on how to use the leds-lm3556 driver.
    diff --git a/Documentation/leds/leds-lm3556.txt b/Documentation/leds/leds-lm3556.txt
    new file mode 100644
    index 0000000..f3ec712
    --- /dev/null
    +++ b/Documentation/leds/leds-lm3556.txt
    @@ -0,0 +1,85 @@
    +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
    +Indicater 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
    +
    +Indicater 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.
    +Toregister 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));
    diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
    index 04cb8c8..af5e43d 100644
    --- a/drivers/leds/Kconfig
    +++ b/drivers/leds/Kconfig
    @@ -415,6 +415,14 @@ config LEDS_MAX8997
    This option enables support for on-chip LED drivers on
    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 LM3556.
    + LM3556 includes Torch, Flash and Indicator functions.
    +
    config LEDS_OT200
    tristate "LED support for the Bachmann OT200"
    depends on LEDS_CLASS && HAS_IOMEM
    diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
    index f8958cd..2d69a86 100644
    --- a/drivers/leds/Makefile
    +++ b/drivers/leds/Makefile
    @@ -47,6 +47,7 @@ obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o
    obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o
    obj-$(CONFIG_LEDS_RENESAS_TPU) += leds-renesas-tpu.o
    obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
    +obj-$(CONFIG_LEDS_LM3556) += leds-lm3556.o

    # LED SPI Drivers
    obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
    diff --git a/drivers/leds/leds-lm3556.c b/drivers/leds/leds-lm3556.c
    new file mode 100644
    index 0000000..f23f3bd
    --- /dev/null
    +++ b/drivers/leds/leds-lm3556.c
    @@ -0,0 +1,523 @@
    +/*
    + * 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,
    +};
    +
    +static int __init lm3556_init(void)
    +{
    + return i2c_add_driver(&lm3556_i2c_driver);
    +}
    +
    +static void __exit lm3556_exit(void)
    +{
    + i2c_del_driver(&lm3556_i2c_driver);
    +}
    +
    +module_init(lm3556_init);
    +module_exit(lm3556_exit);
    +
    +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");
    diff --git a/include/linux/platform_data/leds-lm3556.h b/include/linux/platform_data/leds-lm3556.h
    new file mode 100644
    index 0000000..4b4e7d6
    --- /dev/null
    +++ b/include/linux/platform_data/leds-lm3556.h
    @@ -0,0 +1,50 @@
    +/*
    + * 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.
    + *
    + */
    +
    +#ifndef __LINUX_LM3556_H
    +#define __LINUX_LM3556_H
    +
    +#define LM3556_NAME "leds-lm3556"
    +
    +enum lm3556_pin_polarity {
    + PIN_LOW_ACTIVE = 0,
    + PIN_HIGH_ACTIVE,
    +};
    +
    +enum lm3556_pin_enable {
    + PIN_DISABLED = 0,
    + PIN_ENABLED,
    +};
    +
    +enum lm3556_strobe_usuage {
    + STROBE_EDGE_DETECT = 0,
    + STROBE_LEVEL_DETECT,
    +};
    +
    +enum lm3556_indic_mode {
    + INDIC_MODE_INTERNAL = 0,
    + INDIC_MODE_EXTERNAL,
    +};
    +
    +struct lm3556_platform_data {
    + enum lm3556_pin_enable torch_pin_en;
    + enum lm3556_pin_polarity torch_pin_polarity;
    +
    + enum lm3556_strobe_usuage strobe_usuage;
    + enum lm3556_pin_enable strobe_pin_en;
    + enum lm3556_pin_polarity strobe_pin_polarity;
    +
    + enum lm3556_pin_enable tx_pin_en;
    + enum lm3556_pin_polarity tx_pin_polarity;
    +
    + enum lm3556_indic_mode indicator_mode;
    +};
    +
    +#endif /* __LINUX_LM3556_H */
    --
    1.7.5.4


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