leds: Add LED driver for lm3556 chip
authorG.Shark Jeong <gshark.jeong@gmail.com>
Fri, 22 Jun 2012 00:12:06 +0000 (08:12 +0800)
committerBryan Wu <bryan.wu@canonical.com>
Mon, 23 Jul 2012 23:52:35 +0000 (07:52 +0800)
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: G.Shark Jeong <gshark.jeong@gmail.com>
Reviewed-by: Axel Lin <axel.lin@gmail.com>
Reviewed-by: Kim, Milo <Milo.Kim@ti.com>
Acked-by: Rob Landley <rob@landley.net>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
Documentation/leds/00-INDEX
Documentation/leds/leds-lm3556.txt [new file with mode: 0644]
drivers/leds/Kconfig
drivers/leds/Makefile
drivers/leds/leds-lm3556.c [new file with mode: 0644]
include/linux/platform_data/leds-lm3556.h [new file with mode: 0644]

index 29f481df32c7d26789be20d9960c4c84dec531ff..5fefe374892f9debe8024250a0ea922916878558 100644 (file)
@@ -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 (file)
index 0000000..d9eb91b
--- /dev/null
@@ -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
+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));
index 52f1d456f3d23c5868a06d82e99e6ccde93b4986..f028f0348e838358f177077f223d7f0d13c9ac7b 100644 (file)
@@ -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 to LM3556.
+         LM3556 includes Torch, Flash and Indicator functions.
+
 config LEDS_OT200
        tristate "LED support for the Bachmann OT200"
        depends on LEDS_CLASS && HAS_IOMEM
index 9112d518f9d410dbf482ceed0bec9536cfd13989..5eebd7bce4bece511a8da8b34fa4653f19a557e6 100644 (file)
@@ -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 (file)
index 0000000..3062abd
--- /dev/null
@@ -0,0 +1,512 @@
+/*
+ * 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");
diff --git a/include/linux/platform_data/leds-lm3556.h b/include/linux/platform_data/leds-lm3556.h
new file mode 100644 (file)
index 0000000..4b4e7d6
--- /dev/null
@@ -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 */