Message-ID: <1446440483-6948-16-git-send-email-milo.kim@ti.com>
Date:	Mon, 2 Nov 2015 14:01:22 +0900
From:	Milo Kim <milo.kim@...com>
To:	<devicetree@...r.kernel.org>, <lee.jones@...aro.org>,
	<linux-kernel@...r.kernel.org>
CC:	Milo Kim <milo.kim@...com>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	<linux-leds@...r.kernel.org>
Subject: [PATCH 15/16] leds: add LM3633 driver

LM3633 LED driver supports generic LED functions and pattern generation.
Pattern is generated through the sysfs. ABI documentation is also added.

Device creation from device tree
--------------------------------
  LED channel name, LED string usage and max current settings are
  configured inside the DT.

LED dimming pattern generation
------------------------------
  LM3633 supports programmable dimming pattern generator.
  To enable it, three attributes are used.
  'pattern_times', 'pattern_levels' and 'run_pattern'.
  Sysfs ABI describes it.

LMU HWMON event handling
------------------------
  As soon as LMU HWMON operation is done, LMU HWMON driver sends the event,
  'LMU_EVENT_HWMON_DONE'. Then, LM3633 device should be reinitialized
  because the device was reset by LMU HWMON driver.
  lm3633_led_hwmon_notifier() handles this event.

Data structure
--------------
  ti_lmu_led_chip:	LED device data.
  ti_lmu_led:		LED output channel data.
			One LED device can have multiple LED channels.

Cc: Jacek Anaszewski <j.anaszewski@...sung.com>
Cc: linux-leds@...r.kernel.org
Cc: Lee Jones <lee.jones@...aro.org>
Cc: devicetree@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Milo Kim <milo.kim@...com>
---
 Documentation/ABI/testing/sysfs-class-led-lm3633 |  60 ++
 drivers/leds/Kconfig                             |  10 +
 drivers/leds/Makefile                            |   1 +
 drivers/leds/leds-lm3633.c                       | 749 +++++++++++++++++++++++
 4 files changed, 820 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-class-led-lm3633
 create mode 100644 drivers/leds/leds-lm3633.c

diff --git a/Documentation/ABI/testing/sysfs-class-led-lm3633 b/Documentation/ABI/testing/sysfs-class-led-lm3633
new file mode 100644
index 0000000..c1d8759
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-led-lm3633
@@ -0,0 +1,60 @@
+LM3633 LED driver generates programmable pattern via the sysfs.
+
+LED Pattern Generator Structure
+
+                            (3)
+  (a) --------------->  ___________
+                       /           \
+                  (2) /             \ (4)
+  (b) ----> _________/               \_________  ...
+               (1)                       (5)
+
+                     |<-----   period   -----> |
+
+What:		/sys/class/leds/<led>/pattern_times
+Date:		Oct 2015
+KernelVersion:	4.3
+Contact:	Milo Kim <milo.kim@...com>
+Description:	read/write
+                Set pattern time dimension. There are five arguments.
+                  (1) startup delay
+                  (2) rising dimming time
+                  (3) how much time stays at high level
+                  (4) falling dimming time
+                  (5) how much time stays at low level
+                Ranges are
+                  (1), (3), (5): 0 ~ 10000. Unit is millisecond.
+                  (2), (4): 0 ~ 16000. Unit is millisecond.
+
+                Example:
+                No delay, rising 200ms, high 300ms, falling 100ms, low 400ms.
+                echo "0 200 300 100 400" > /sys/class/leds/<led>/pattern_times
+
+                cat /sys/class/leds/<led>/pattern_times
+                delay: 0, rise: 200, high: 300, fall: 100, low: 400
+
+What:		/sys/class/leds/<led>/pattern_levels
+Date:		Oct 2015
+KernelVersion:	4.3
+Contact:	Milo Kim <milo.kim@...com>
+Description:	read/write
+                Set pattern level(brightness). There are two arguments.
+                  (a) Low brightness level
+                  (b) High brightness level
+                Ranges are from 0 to 255.
+
+                Example:
+                Low level is 0, high level is 255.
+                echo "0 255" > /sys/class/leds/<led>/pattern_levels
+
+                cat /sys/class/leds/<led>/pattern_levels
+                low brightness: 0, high brightness: 255
+
+What:		/sys/class/leds/<led>/run_pattern
+Date:		Oct 2015
+KernelVersion:	4.3
+Contact:	Milo Kim <milo.kim@...com>
+Description:	write only
+                After 'pattern_times' and 'pattern_levels' are updated,
+                run the pattern by writing 1 to 'run_pattern'.
+                To stop running pattern, writes 0 to 'run_pattern'.
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 42990f2..bc41a0e 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -88,6 +88,16 @@ config LEDS_LM3533
 	  hardware-accelerated blinking with maximum on and off periods of 9.8
 	  and 77 seconds respectively.
 
+config LEDS_LM3633
+	tristate "LED support for the TI LM3633 LMU"
+	depends on LEDS_CLASS
+	depends on MFD_TI_LMU
+	help
+	  This option enables support for the LEDs on the LM3633.
+	  LM3633 has 6 low voltage indicator LEDs.
+	  All low voltage current sinks can have a programmable pattern
+	  modulated onto LED output strings.
+
 config LEDS_LM3642
 	tristate "LED support for LM3642 Chip"
 	depends on LEDS_CLASS && I2C
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index b503f92..984f44a 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_LEDS_BD2802)		+= leds-bd2802.o
 obj-$(CONFIG_LEDS_LOCOMO)		+= leds-locomo.o
 obj-$(CONFIG_LEDS_LM3530)		+= leds-lm3530.o
 obj-$(CONFIG_LEDS_LM3533)		+= leds-lm3533.o
+obj-$(CONFIG_LEDS_LM3633)		+= leds-lm3633.o
 obj-$(CONFIG_LEDS_LM3642)		+= leds-lm3642.o
 obj-$(CONFIG_LEDS_MIKROTIK_RB532)	+= leds-rb532.o
 obj-$(CONFIG_LEDS_S3C24XX)		+= leds-s3c24xx.o
diff --git a/drivers/leds/leds-lm3633.c b/drivers/leds/leds-lm3633.c
new file mode 100644
index 0000000..66da609
--- /dev/null
+++ b/drivers/leds/leds-lm3633.c
@@ -0,0 +1,749 @@
+/*
+ * TI LM3633 LED driver
+ *
+ * Copyright 2015 Texas Instruments
+ *
+ * Author: Milo Kim <milo.kim@...com>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/mfd/ti-lmu.h>
+#include <linux/mfd/ti-lmu-register.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/notifier.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define LM3633_LED_MAX_BRIGHTNESS		255
+#define LM3633_DEFAULT_LED_NAME			"indicator"
+#define LM3633_MAX_PERIOD			9700
+#define LM3633_SHORT_TIMESTEP			16
+#define LM3633_LONG_TIMESTEP			131
+#define LM3633_TIME_OFFSET			61
+#define LM3633_PATTERN_REG_OFFSET		16
+
+enum lm3633_led_bank_id {
+	LM3633_LED_BANK_C,
+	LM3633_LED_BANK_D,
+	LM3633_LED_BANK_E,
+	LM3633_LED_BANK_F,
+	LM3633_LED_BANK_G,
+	LM3633_LED_BANK_H,
+	LM3633_MAX_LEDS,
+};
+
+struct lm3633_pattern_time {
+	unsigned int delay;
+	unsigned int rise;
+	unsigned int high;
+	unsigned int fall;
+	unsigned int low;
+};
+
+struct lm3633_pattern_level {
+	u8 low;
+	u8 high;
+};
+
+/**
+ * struct ti_lmu_led_chip
+ *
+ * @dev:		Parent device pointer
+ * @lmu:		LMU structure. Used for register R/W access.
+ * @lock:		Secure handling for multiple user interface access
+ * @lmu_led:		Multiple LED strings
+ * @num_leds:		Number of LED strings
+ * @nb:			Notifier block for handling hwmon event
+ *
+ * One LED chip can have multiple LED strings.
+ */
+struct ti_lmu_led_chip {
+	struct device *dev;
+	struct ti_lmu *lmu;
+	struct mutex lock;
+	struct ti_lmu_led *lmu_led;
+	int num_leds;
+	struct notifier_block nb;
+};
+
+/**
+ * struct ti_lmu_led
+ *
+ * @chip:		Pointer to parent LED device
+ * @bank_id:		LED bank ID
+ * @cdev:		LED subsystem device structure
+ * @name:		LED channel name
+ * @led_string:		LED string configuration.
+ *			Bit mask is set on parsing DT.
+ * @imax:		[Optional] Max current index.
+ *			It's result of ti_lmu_get_current_code().
+ * @work:		Used for scheduling brightness control
+ * @brightness:		Brightness value
+ * @time:		Pattern time dimension
+ * @level:		Pattern level dimension
+ *
+ * Each LED device has its own channel configuration.
+ * For chip control, parent chip data structure is used.
+ */
+struct ti_lmu_led {
+	struct ti_lmu_led_chip *chip;
+	enum lm3633_led_bank_id bank_id;
+	struct led_classdev cdev;
+	const char *name;
+
+	unsigned long led_string;	/* bit OR mask of LMU_LVLEDx */;
+	#define LMU_LVLED1	BIT(0)
+	#define LMU_LVLED2	BIT(1)
+	#define LMU_LVLED3	BIT(2)
+	#define LMU_LVLED4	BIT(3)
+	#define LMU_LVLED5	BIT(4)
+	#define LMU_LVLED6	BIT(5)
+
+	struct work_struct work;
+	enum led_brightness brightness;
+	enum ti_lmu_max_current imax;
+
+	/* Pattern specific data */
+	struct lm3633_pattern_time time;
+	struct lm3633_pattern_level level;
+};
+
+static struct ti_lmu_led *to_ti_lmu_led(struct device *dev)
+{
+	struct led_classdev *cdev = dev_get_drvdata(dev);
+
+	return container_of(cdev, struct ti_lmu_led, cdev);
+}
+
+static u8 lm3633_led_get_enable_mask(struct ti_lmu_led *lmu_led)
+{
+	return 1 << (lmu_led->bank_id + LM3633_LED_BANK_OFFSET);
+}
+
+static int lm3633_led_enable_bank(struct ti_lmu_led *lmu_led)
+{
+	u8 mask = lm3633_led_get_enable_mask(lmu_led);
+
+	return ti_lmu_update_bits(lmu_led->chip->lmu, LM3633_REG_ENABLE,
+				  mask, mask);
+}
+
+static int lm3633_led_disable_bank(struct ti_lmu_led *lmu_led)
+{
+	u8 mask = lm3633_led_get_enable_mask(lmu_led);
+
+	return ti_lmu_update_bits(lmu_led->chip->lmu, LM3633_REG_ENABLE,
+				  mask, 0);
+}
+
+static int lm3633_led_enable_pattern(struct ti_lmu_led *lmu_led)
+{
+	u8 mask = lm3633_led_get_enable_mask(lmu_led);
+
+	return ti_lmu_update_bits(lmu_led->chip->lmu, LM3633_REG_PATTERN, mask,
+				  mask);
+}
+
+static int lm3633_led_disable_pattern(struct ti_lmu_led *lmu_led)
+{
+	u8 mask = lm3633_led_get_enable_mask(lmu_led);
+
+	return ti_lmu_update_bits(lmu_led->chip->lmu, LM3633_REG_PATTERN, mask,
+				  0);
+}
+
+static int lm3633_led_config_bank(struct ti_lmu_led *lmu_led)
+{
+	const u8 group_led[] = { 0, BIT(0), BIT(0), 0, BIT(3), BIT(3), };
+	const enum lm3633_led_bank_id default_id[] = {
+		LM3633_LED_BANK_C, LM3633_LED_BANK_C, LM3633_LED_BANK_C,
+		LM3633_LED_BANK_F, LM3633_LED_BANK_F, LM3633_LED_BANK_F,
+	};
+	const enum lm3633_led_bank_id separate_id[] = {
+		LM3633_LED_BANK_C, LM3633_LED_BANK_D, LM3633_LED_BANK_E,
+		LM3633_LED_BANK_F, LM3633_LED_BANK_G, LM3633_LED_BANK_H,
+	};
+	int i, ret;
+	u8 val;
+
+	/*
+	 * Check configured LED string and assign control bank
+	 *
+	 * Each LED is tied with other LEDS (group):
+	 *   the default control bank is assigned
+	 *
+	 * Otherwise:
+	 *   separate bank is assigned
+	 */
+
+	for (i = 0; i < LM3633_MAX_LEDS; i++) {
+		/* LED 0 and LED 3 are fixed, so no assignment is required */
+		if (i == 0 || i == 3)
+			continue;
+
+		if (test_bit(i, &lmu_led->led_string)) {
+			if (lmu_led->led_string & group_led[i]) {
+				lmu_led->bank_id = default_id[i];
+				val = 0;
+			} else {
+				lmu_led->bank_id = separate_id[i];
+				val = BIT(i);
+			}
+
+			ret = ti_lmu_update_bits(lmu_led->chip->lmu,
+						 LM3633_REG_BANK_SEL,
+						 BIT(i), val);
+			if (ret)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+
+static ssize_t lm3633_led_show_pattern_times(struct device *dev,
+					     struct device_attribute *attr,
+					     char *buf)
+{
+	struct ti_lmu_led *lmu_led = to_ti_lmu_led(dev);
+
+	return sprintf(buf,
+		       "delay: %u, rise: %u, high: %u, fall: %u, low: %u\n",
+		       lmu_led->time.delay, lmu_led->time.rise,
+		       lmu_led->time.high, lmu_led->time.fall,
+		       lmu_led->time.low);
+}
+
+static u8 lm3633_convert_time_to_index(unsigned int msec)
+{
+	u8 idx, offset;
+
+	/*
+	 * Find appropriate register index around input time value
+	 *
+	 *      0 <= time <= 1000 : 16ms step
+	 *   1000 <  time <= 9700 : 131ms step, base index is 61
+	 */
+
+	msec = min_t(int, msec, LM3633_MAX_PERIOD);
+
+	if (msec <= 1000) {
+		idx = msec / LM3633_SHORT_TIMESTEP;
+		if (idx > 1)
+			idx--;
+		offset = 0;
+	} else {
+		idx = (msec - 1000) / LM3633_LONG_TIMESTEP;
+		offset = LM3633_TIME_OFFSET;
+	}
+
+	return idx + offset;
+}
+
+static u8 lm3633_convert_ramp_to_index(unsigned int msec)
+{
+	const int ramp_table[] = { 2, 250, 500, 1000, 2000, 4000, 8000, 16000 };
+	int size = ARRAY_SIZE(ramp_table);
+	int i;
+
+	if (msec <= ramp_table[0])
+		return 0;
+
+	if (msec > ramp_table[size - 1])
+		return size - 1;
+
+	for (i = 1; i < size; i++) {
+		if (msec == ramp_table[i])
+			return i;
+
+		/* Find the most closest value by looking up the table */
+		if (msec > ramp_table[i - 1] && msec < ramp_table[i]) {
+			if (msec - ramp_table[i - 1] < ramp_table[i] - msec)
+				return i - 1;
+			else
+				return i;
+		}
+	}
+
+	return 0;
+}
+
+static ssize_t lm3633_led_store_pattern_times(struct device *dev,
+					      struct device_attribute *attr,
+					      const char *buf, size_t len)
+{
+	struct ti_lmu_led *lmu_led = to_ti_lmu_led(dev);
+	struct ti_lmu_led_chip *chip = lmu_led->chip;
+	struct lm3633_pattern_time *time = &lmu_led->time;
+	u8 offset = lmu_led->bank_id * LM3633_PATTERN_REG_OFFSET;
+	int ret;
+	u8 reg, val;
+
+	/*
+	 * Sequence
+	 *
+	 * 1) Read pattern time data (unit: msec)
+	 * 2) Update DELAY register
+	 * 3) Update HIGH TIME register
+	 * 4) Update LOW TIME register
+	 * 5) Update RAMP TIME registers
+	 *
+	 * Time register addresses need offset number based on the LED bank.
+	 * Register values are index domain, so input time value should be
+	 * converted to index.
+	 * Please note that ramp register address has no offset value.
+	 */
+
+	ret = sscanf(buf, "%u %u %u %u %u", &time->delay, &time->rise,
+		     &time->high, &time->fall, &time->low);
+	if (ret != 5)
+		return -EINVAL;
+
+	mutex_lock(&chip->lock);
+
+	reg = LM3633_REG_PTN_DELAY + offset;
+	val = lm3633_convert_time_to_index(time->delay);
+	ret = ti_lmu_write_byte(chip->lmu, reg, val);
+	if (ret)
+		goto skip;
+
+	reg = LM3633_REG_PTN_HIGHTIME + offset;
+	val = lm3633_convert_time_to_index(time->high);
+	ret = ti_lmu_write_byte(chip->lmu, reg, val);
+	if (ret)
+		goto skip;
+
+	reg = LM3633_REG_PTN_LOWTIME + offset;
+	val = lm3633_convert_time_to_index(time->low);
+	ret = ti_lmu_write_byte(chip->lmu, reg, val);
+	if (ret)
+		goto skip;
+
+	switch (lmu_led->bank_id) {
+	case LM3633_LED_BANK_C:
+	case LM3633_LED_BANK_D:
+	case LM3633_LED_BANK_E:
+		reg = LM3633_REG_PTN0_RAMP;
+		break;
+	case LM3633_LED_BANK_F:
+	case LM3633_LED_BANK_G:
+	case LM3633_LED_BANK_H:
+		reg = LM3633_REG_PTN1_RAMP;
+		break;
+	default:
+		ret = -EINVAL;
+		goto skip;
+	}
+
+	val = lm3633_convert_ramp_to_index(time->rise);
+	ret = ti_lmu_update_bits(chip->lmu, reg, LM3633_PTN_RAMPUP_MASK,
+				 val << LM3633_PTN_RAMPUP_SHIFT);
+	if (ret)
+		goto skip;
+
+	val = lm3633_convert_ramp_to_index(time->fall);
+	ret = ti_lmu_update_bits(chip->lmu, reg, LM3633_PTN_RAMPDN_MASK,
+				 val << LM3633_PTN_RAMPDN_SHIFT);
+	if (ret)
+		goto skip;
+
+	mutex_unlock(&chip->lock);
+	return len;
+
+skip:
+	mutex_unlock(&chip->lock);
+	return ret;
+}
+
+static ssize_t lm3633_led_show_pattern_levels(struct device *dev,
+					      struct device_attribute *attr,
+					      char *buf)
+{
+	struct ti_lmu_led *lmu_led = to_ti_lmu_led(dev);
+
+	return sprintf(buf, "low brightness: %u, high brightness: %u\n",
+		       lmu_led->level.low, lmu_led->level.high);
+}
+
+static ssize_t lm3633_led_store_pattern_levels(struct device *dev,
+					       struct device_attribute *attr,
+					       const char *buf, size_t len)
+{
+	struct ti_lmu_led *lmu_led = to_ti_lmu_led(dev);
+	struct ti_lmu_led_chip *chip = lmu_led->chip;
+	unsigned int low, high;
+	u8 reg, offset, val;
+	int ret;
+
+	/*
+	 * Sequence
+	 *
+	 * 1) Read pattern level data
+	 * 2) Disable a bank before programming a pattern
+	 * 3) Update LOW BRIGHTNESS register
+	 * 4) Update HIGH BRIGHTNESS register
+	 *
+	 * Level register addresses have offset number based on the LED bank.
+	 */
+
+	ret = sscanf(buf, "%u %u", &low, &high);
+	if (ret != 2)
+		return -EINVAL;
+
+	low = min_t(unsigned int, low, LM3633_LED_MAX_BRIGHTNESS);
+	high = min_t(unsigned int, high, LM3633_LED_MAX_BRIGHTNESS);
+	lmu_led->level.low = (u8)low;
+	lmu_led->level.high = (u8)high;
+
+	mutex_lock(&chip->lock);
+	ret = lm3633_led_disable_bank(lmu_led);
+	if (ret)
+		goto skip;
+
+	offset = lmu_led->bank_id * LM3633_PATTERN_REG_OFFSET;
+	reg = LM3633_REG_PTN_LOWBRT + offset;
+	val = lmu_led->level.low;
+	ret = ti_lmu_write_byte(chip->lmu, reg, val);
+	if (ret)
+		goto skip;
+
+	offset = lmu_led->bank_id;
+	reg = LM3633_REG_PTN_HIGHBRT + offset;
+	val = lmu_led->level.high;
+	ret = ti_lmu_write_byte(chip->lmu, reg, val);
+	if (ret)
+		goto skip;
+
+	mutex_unlock(&chip->lock);
+	return len;
+
+skip:
+	mutex_unlock(&chip->lock);
+	return ret;
+}
+
+static ssize_t lm3633_led_run_pattern(struct device *dev,
+				      struct device_attribute *attr,
+				      const char *buf, size_t len)
+{
+	struct ti_lmu_led *lmu_led = to_ti_lmu_led(dev);
+	struct ti_lmu_led_chip *chip = lmu_led->chip;
+	unsigned long enable;
+	int ret;
+
+	if (kstrtoul(buf, 0, &enable))
+		return -EINVAL;
+
+	mutex_lock(&chip->lock);
+
+	if (enable)
+		ret = lm3633_led_enable_pattern(lmu_led);
+	else
+		ret = lm3633_led_disable_pattern(lmu_led);
+
+	if (ret) {
+		mutex_unlock(&chip->lock);
+		return ret;
+	}
+
+	if (enable)
+		lm3633_led_enable_bank(lmu_led);
+
+	mutex_unlock(&chip->lock);
+
+	return len;
+}
+
+static DEVICE_ATTR(pattern_times, S_IRUGO | S_IWUSR,
+		   lm3633_led_show_pattern_times,
+		   lm3633_led_store_pattern_times);
+static DEVICE_ATTR(pattern_levels, S_IRUGO | S_IWUSR,
+		   lm3633_led_show_pattern_levels,
+		   lm3633_led_store_pattern_levels);
+static DEVICE_ATTR(run_pattern, S_IWUSR, NULL,
+		   lm3633_led_run_pattern);
+
+static struct attribute *lm3633_led_attrs[] = {
+	&dev_attr_pattern_times.attr,
+	&dev_attr_pattern_levels.attr,
+	&dev_attr_run_pattern.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(lm3633_led);	/* lm3633_led_groups */
+
+static int lm3633_led_set_max_current(struct ti_lmu_led *lmu_led)
+{
+	u8 reg = LM3633_REG_IMAX_LVLED_BASE + lmu_led->bank_id;
+
+	return ti_lmu_write_byte(lmu_led->chip->lmu, reg, lmu_led->imax);
+}
+
+static void lm3633_led_work(struct work_struct *work)
+{
+	struct ti_lmu_led *lmu_led = container_of(work, struct ti_lmu_led,
+						  work);
+	struct ti_lmu_led_chip *chip = lmu_led->chip;
+	int ret;
+
+	mutex_lock(&chip->lock);
+
+	ret = ti_lmu_write_byte(chip->lmu,
+				LM3633_REG_BRT_LVLED_BASE + lmu_led->bank_id,
+				lmu_led->brightness);
+	if (ret) {
+		mutex_unlock(&chip->lock);
+		return;
+	}
+
+	if (lmu_led->brightness == 0)
+		lm3633_led_disable_bank(lmu_led);
+	else
+		lm3633_led_enable_bank(lmu_led);
+
+	mutex_unlock(&chip->lock);
+}
+
+static void lm3633_led_brightness_set(struct led_classdev *cdev,
+				      enum led_brightness brt_val)
+{
+	struct ti_lmu_led *lmu_led = container_of(cdev, struct ti_lmu_led,
+						  cdev);
+
+	lmu_led->brightness = brt_val;
+	schedule_work(&lmu_led->work);
+}
+
+static int lm3633_led_init(struct ti_lmu_led *lmu_led, int bank_id)
+{
+	struct device *dev = lmu_led->chip->dev;
+	char name[12];
+	int ret;
+
+	/*
+	 * Sequence
+	 *
+	 * 1) Configure LED bank which is used for brightness control
+	 * 2) Set max current for each output channel
+	 * 3) Add LED device
+	 */
+
+	ret = lm3633_led_config_bank(lmu_led);
+	if (ret) {
+		dev_err(dev, "Output bank register err: %d\n", ret);
+		return ret;
+	}
+
+	ret = lm3633_led_set_max_current(lmu_led);
+	if (ret) {
+		dev_err(dev, "Set max current err: %d\n", ret);
+		return ret;
+	}
+
+	lmu_led->cdev.max_brightness = LM3633_LED_MAX_BRIGHTNESS;
+	lmu_led->cdev.brightness_set = lm3633_led_brightness_set;
+	lmu_led->cdev.groups = lm3633_led_groups;
+
+	if (lmu_led->name) {
+		lmu_led->cdev.name = lmu_led->name;
+	} else {
+		snprintf(name, sizeof(name), "%s:%d", LM3633_DEFAULT_LED_NAME,
+			 bank_id);
+		lmu_led->cdev.name = name;
+	}
+
+	ret = led_classdev_register(dev, &lmu_led->cdev);
+	if (ret) {
+		dev_err(dev, "LED register err: %d\n", ret);
+		return ret;
+	}
+
+	INIT_WORK(&lmu_led->work, lm3633_led_work);
+
+	return 0;
+}
+
+static int lm3633_led_of_create(struct ti_lmu_led_chip *chip,
+				struct device_node *np)
+{
+	struct device_node *child;
+	struct device *dev = chip->dev;
+	struct ti_lmu_led *lmu_led, *each;
+	int num_leds;
+	int i = 0;
+	u32 imax;
+
+	if (!np)
+		return -ENODEV;
+
+	num_leds = of_get_child_count(np);
+	if (num_leds == 0 || num_leds > LM3633_MAX_LEDS) {
+		dev_err(dev, "Invalid number of LEDs: %d\n", num_leds);
+		return -EINVAL;
+	}
+
+	lmu_led = devm_kzalloc(dev, sizeof(*lmu_led) * num_leds, GFP_KERNEL);
+	if (!lmu_led)
+		return -ENOMEM;
+
+	for_each_child_of_node(np, child) {
+		each = lmu_led + i;
+
+		of_property_read_string(child, "channel-name", &each->name);
+
+		/* Make LED strings */
+		each->led_string = 0;
+		if (of_property_read_bool(child, "lvled1-used"))
+			each->led_string |= LMU_LVLED1;
+		if (of_property_read_bool(child, "lvled2-used"))
+			each->led_string |= LMU_LVLED2;
+		if (of_property_read_bool(child, "lvled3-used"))
+			each->led_string |= LMU_LVLED3;
+		if (of_property_read_bool(child, "lvled4-used"))
+			each->led_string |= LMU_LVLED4;
+		if (of_property_read_bool(child, "lvled5-used"))
+			each->led_string |= LMU_LVLED5;
+		if (of_property_read_bool(child, "lvled6-used"))
+			each->led_string |= LMU_LVLED6;
+
+		imax = 0;
+		of_property_read_u32(child, "led-max-microamp", &imax);
+		each->imax = ti_lmu_get_current_code(imax);
+
+		each->bank_id = 0;
+		each->chip = chip;
+		i++;
+	}
+
+	chip->lmu_led = lmu_led;
+	chip->num_leds = num_leds;
+
+	return 0;
+}
+
+static int lm3633_led_hwmon_notifier(struct notifier_block *nb,
+				     unsigned long action, void *unused)
+{
+	struct ti_lmu_led_chip *chip = container_of(nb, struct ti_lmu_led_chip,
+						    nb);
+	struct ti_lmu_led *each;
+	int i, ret;
+
+	/* LED should be reconfigured after hwmon procedure is done */
+	if (action == LMU_EVENT_HWMON_DONE) {
+		for (i = 0; i < chip->num_leds; i++) {
+			each = chip->lmu_led + i;
+			ret = lm3633_led_config_bank(each);
+			if (ret) {
+				dev_err(chip->dev,
+					"Output bank register err: %d\n", ret);
+				return NOTIFY_STOP;
+			}
+
+			ret = lm3633_led_set_max_current(each);
+			if (ret) {
+				dev_err(chip->dev, "Set max current err: %d\n",
+					ret);
+				return NOTIFY_STOP;
+			}
+		}
+	}
+
+	return NOTIFY_OK;
+}
+
+static int lm3633_led_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ti_lmu *lmu = dev_get_drvdata(dev->parent);
+	struct ti_lmu_led_chip *chip;
+	struct ti_lmu_led *each;
+	int i, ret;
+
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->dev = dev;
+	chip->lmu = lmu;
+
+	ret = lm3633_led_of_create(chip, dev->of_node);
+	if (ret)
+		return ret;
+
+	/*
+	 * Notifier callback is required because LED device needs
+	 * reconfiguration after opened/shorted circuit fault monitoring
+	 * by ti-lmu-hwmon driver.
+	 */
+	chip->nb.notifier_call = lm3633_led_hwmon_notifier;
+	ret = blocking_notifier_chain_register(&chip->lmu->notifier, &chip->nb);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < chip->num_leds; i++) {
+		each = chip->lmu_led + i;
+		ret = lm3633_led_init(each, i);
+		if (ret) {
+			dev_err(dev, "LED initialization err: %d\n", ret);
+			goto cleanup_leds;
+		}
+	}
+
+	mutex_init(&chip->lock);
+	platform_set_drvdata(pdev, chip);
+
+	return 0;
+
+cleanup_leds:
+	while (--i >= 0) {
+		each = chip->lmu_led + i;
+		led_classdev_unregister(&each->cdev);
+	}
+	return ret;
+}
+
+static int lm3633_led_remove(struct platform_device *pdev)
+{
+	struct ti_lmu_led_chip *chip = platform_get_drvdata(pdev);
+	struct ti_lmu_led *each;
+	int i;
+
+	blocking_notifier_chain_unregister(&chip->lmu->notifier, &chip->nb);
+
+	for (i = 0; i < chip->num_leds; i++) {
+		each = chip->lmu_led + i;
+		led_classdev_unregister(&each->cdev);
+		flush_work(&each->work);
+	}
+
+	return 0;
+}
+
+static const struct of_device_id lm3633_led_of_match[] = {
+	{ .compatible = "ti,lm3633-leds" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, lm3633_led_of_match);
+
+static struct platform_driver lm3633_led_driver = {
+	.probe = lm3633_led_probe,
+	.remove = lm3633_led_remove,
+	.driver = {
+		.name = "lm3633-leds",
+		.of_match_table = lm3633_led_of_match,
+	},
+};
+
+module_platform_driver(lm3633_led_driver);
+
+MODULE_DESCRIPTION("TI LM3633 LED Driver");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:lm3633-leds");
-- 
1.9.1

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