Message-id: <1397228216-6657-4-git-send-email-j.anaszewski@samsung.com>
Date:	Fri, 11 Apr 2014 16:56:54 +0200
From:	Jacek Anaszewski <j.anaszewski@...sung.com>
To:	linux-media@...r.kernel.org, linux-leds@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	s.nawrocki@...sung.com, a.hajda@...sung.com,
	kyungmin.park@...sung.com,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	SangYoung Son <hello.son@...sung.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>
Subject: [PATCH/RFC v3 3/5] leds: Add support for max77693 mfd flash cell

This patch adds led-flash support to Maxim max77693 chipset.
A device can be exposed to user space through LED subsystem
sysfs interface or through V4L2 subdevice when the support
for V4L2 Flash sub-devices is enabled. Device supports up to
two leds which can work in flash and torch mode. Leds can
be triggered externally or by software.

Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@...sung.com>
Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
Cc: Bryan Wu <cooloney@...il.com>
Cc: Richard Purdie <rpurdie@...ys.net>
Cc: SangYoung Son <hello.son@...sung.com>
Cc: Samuel Ortiz <sameo@...ux.intel.com>
Cc: Lee Jones <lee.jones@...aro.org>
---
 drivers/leds/Kconfig         |   10 +
 drivers/leds/Makefile        |    1 +
 drivers/leds/leds-max77693.c |  794 ++++++++++++++++++++++++++++++++++++++++++
 drivers/mfd/max77693.c       |    2 +-
 include/linux/mfd/max77693.h |   38 ++
 5 files changed, 844 insertions(+), 1 deletion(-)
 create mode 100644 drivers/leds/leds-max77693.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 1e1c81f..b2152a6 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -462,6 +462,16 @@ config LEDS_TCA6507
 	  LED driver chips accessed via the I2C bus.
 	  Driver support brightness control and hardware-assisted blinking.
 
+config LEDS_MAX77693
+	tristate "LED support for MAX77693 Flash"
+	depends on LEDS_CLASS_FLASH
+	depends on MFD_MAX77693
+	depends on OF
+	help
+	  This option enables support for the flash part of the MAX77693
+	  multifunction device. It has build in control for two leds in flash
+	  and torch mode.
+
 config LEDS_MAX8997
 	tristate "LED support for MAX8997 PMIC"
 	depends on LEDS_CLASS && MFD_MAX8997
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 8861b86..64f6234 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_LEDS_MC13783)		+= leds-mc13783.o
 obj-$(CONFIG_LEDS_NS2)			+= leds-ns2.o
 obj-$(CONFIG_LEDS_NETXBIG)		+= leds-netxbig.o
 obj-$(CONFIG_LEDS_ASIC3)		+= leds-asic3.o
+obj-$(CONFIG_LEDS_MAX77693)		+= leds-max77693.o
 obj-$(CONFIG_LEDS_MAX8997)		+= leds-max8997.o
 obj-$(CONFIG_LEDS_LM355x)		+= leds-lm355x.o
 obj-$(CONFIG_LEDS_BLINKM)		+= leds-blinkm.o
diff --git a/drivers/leds/leds-max77693.c b/drivers/leds/leds-max77693.c
new file mode 100644
index 0000000..979736c
--- /dev/null
+++ b/drivers/leds/leds-max77693.c
@@ -0,0 +1,794 @@
+/*
+ *	Copyright (C) 2014, Samsung Electronics Co., Ltd.
+ *
+ *	Authors: Andrzej Hajda <a.hajda@...sung.com>
+ *		 Jacek Anaszewski <j.anaszewski@...sung.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 <asm/div64.h>
+#include <linux/leds_flash.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <media/v4l2-flash.h>
+#include <linux/workqueue.h>
+#include <linux/mfd/max77693.h>
+#include <linux/mfd/max77693-private.h>
+
+#define MAX77693_LED_NAME		"max77693-flash"
+
+#define MAX77693_TORCH_IOUT_BITS	4
+
+#define MAX77693_TORCH_NO_TIMER		0x40
+#define MAX77693_FLASH_TIMER_LEVEL	0x80
+
+#define MAX77693_FLASH_EN_OFF		0
+#define MAX77693_FLASH_EN_FLASH		1
+#define MAX77693_FLASH_EN_TORCH		2
+#define MAX77693_FLASH_EN_ON		3
+
+#define MAX77693_FLASH_EN1_SHIFT	6
+#define MAX77693_FLASH_EN2_SHIFT	4
+#define MAX77693_TORCH_EN1_SHIFT	2
+#define MAX77693_TORCH_EN2_SHIFT	0
+
+#define MAX77693_FLASH_LOW_BATTERY_EN	0x80
+
+#define MAX77693_FLASH_BOOST_FIXED	0x04
+#define MAX77693_FLASH_BOOST_LEDNUM_2	0x80
+
+#define MAX77693_FLASH_TIMEOUT_MIN	62500
+#define MAX77693_FLASH_TIMEOUT_MAX	1000000
+#define MAX77693_FLASH_TIMEOUT_STEP	62500
+
+#define MAX77693_TORCH_TIMEOUT_MIN	262000
+#define MAX77693_TORCH_TIMEOUT_MAX	15728000
+
+#define MAX77693_FLASH_IOUT_MIN		15625
+#define MAX77693_FLASH_IOUT_MAX_1LED	1000000
+#define MAX77693_FLASH_IOUT_MAX_2LEDS	625000
+#define MAX77693_FLASH_IOUT_STEP	15625
+
+#define MAX77693_TORCH_IOUT_MIN		15625
+#define MAX77693_TORCH_IOUT_MAX		250000
+#define MAX77693_TORCH_IOUT_STEP	15625
+
+#define MAX77693_FLASH_VSYS_MIN		2400
+#define MAX77693_FLASH_VSYS_MAX		3400
+#define MAX77693_FLASH_VSYS_STEP	33
+
+#define MAX77693_FLASH_VOUT_MIN		3300
+#define MAX77693_FLASH_VOUT_MAX		5500
+#define MAX77693_FLASH_VOUT_STEP	25
+#define MAX77693_FLASH_VOUT_RMIN	0x0c
+
+#define MAX77693_LED_STATUS_FLASH_ON	(1 << 3)
+#define MAX77693_LED_STATUS_TORCH_ON	(1 << 2)
+
+#define MAX77693_LED_FLASH_INT_FLED2_OPEN	(1 << 0)
+#define MAX77693_LED_FLASH_INT_FLED2_SHORT	(1 << 1)
+#define MAX77693_LED_FLASH_INT_FLED1_OPEN	(1 << 2)
+#define MAX77693_LED_FLASH_INT_FLED1_SHORT	(1 << 3)
+#define MAX77693_LED_FLASH_INT_OVER_CURRENT	(1 << 4)
+
+#define MAX77693_MODE_OFF			0
+#define MAX77693_MODE_FLASH			(1 << 0)
+#define MAX77693_MODE_TORCH			(1 << 1)
+#define MAX77693_MODE_FLASH_EXTERNAL		(1 << 2)
+
+enum {
+	FLASH1,
+	FLASH2,
+	TORCH1,
+	TORCH2
+};
+
+enum {
+	FLASH,
+	TORCH
+};
+
+struct max77693_led {
+	struct regmap *regmap;
+	struct platform_device *pdev;
+	struct max77693_led_platform_data *pdata;
+	struct mutex lock;
+
+	struct led_classdev ldev;
+
+	unsigned int torch_brightness;
+	struct work_struct work_brightness_set;
+	unsigned int mode_flags;
+};
+
+static u8 max77693_led_iout_to_reg(u32 ua)
+{
+	if (ua < MAX77693_FLASH_IOUT_MIN)
+		ua = MAX77693_FLASH_IOUT_MIN;
+	return (ua - MAX77693_FLASH_IOUT_MIN) / MAX77693_FLASH_IOUT_STEP;
+}
+
+static u8 max77693_flash_timeout_to_reg(u32 us)
+{
+	return (us - MAX77693_FLASH_TIMEOUT_MIN) / MAX77693_FLASH_TIMEOUT_STEP;
+}
+
+static const u32 max77693_torch_timeouts[] = {
+	262000, 524000, 786000, 1048000,
+	1572000, 2096000, 2620000, 3144000,
+	4193000, 5242000, 6291000, 7340000,
+	9437000, 11534000, 13631000, 1572800
+};
+
+static u8 max77693_torch_timeout_to_reg(u32 us)
+{
+	int i, b = 0, e = ARRAY_SIZE(max77693_torch_timeouts);
+
+	while (e - b > 1) {
+		i = b + (e - b) / 2;
+		if (us < max77693_torch_timeouts[i])
+			e = i;
+		else
+			b = i;
+	}
+	return b;
+}
+
+static struct max77693_led *ldev_to_led(struct led_classdev *ldev)
+{
+	return container_of(ldev, struct max77693_led, ldev);
+}
+
+static u32 max77693_torch_timeout_from_reg(u8 reg)
+{
+	return max77693_torch_timeouts[reg];
+}
+
+static u8 max77693_led_vsys_to_reg(u32 mv)
+{
+	return ((mv - MAX77693_FLASH_VSYS_MIN) / MAX77693_FLASH_VSYS_STEP) << 2;
+}
+
+static u8 max77693_led_vout_to_reg(u32 mv)
+{
+	return (mv - MAX77693_FLASH_VOUT_MIN) / MAX77693_FLASH_VOUT_STEP +
+		MAX77693_FLASH_VOUT_RMIN;
+}
+
+/* split composite current @i into two @iout according to @imax weights */
+static void max77693_calc_iout(u32 iout[2], u32 i, u32 imax[2])
+{
+	u64 t = i;
+
+	t *= imax[1];
+	do_div(t, imax[0] + imax[1]);
+
+	iout[1] = (u32)t / MAX77693_FLASH_IOUT_STEP * MAX77693_FLASH_IOUT_STEP;
+	iout[0] = i - iout[1];
+}
+
+static int max77693_set_mode(struct max77693_led *led, unsigned int mode)
+{
+	struct max77693_led_platform_data *p = led->pdata;
+	struct regmap *rmap = led->regmap;
+	int ret, v = 0;
+
+	if (mode & MAX77693_MODE_TORCH) {
+		if (p->trigger[TORCH1] & MAX77693_LED_TRIG_SOFT)
+			v |= MAX77693_FLASH_EN_ON << MAX77693_TORCH_EN1_SHIFT;
+		if (p->trigger[TORCH2] & MAX77693_LED_TRIG_SOFT)
+			v |= MAX77693_FLASH_EN_ON << MAX77693_TORCH_EN2_SHIFT;
+	}
+
+	if (mode & MAX77693_MODE_FLASH) {
+		if (p->trigger[FLASH1] & MAX77693_LED_TRIG_SOFT)
+			v |= MAX77693_FLASH_EN_ON << MAX77693_FLASH_EN1_SHIFT;
+		if (p->trigger[FLASH2] & MAX77693_LED_TRIG_SOFT)
+			v |= MAX77693_FLASH_EN_ON << MAX77693_FLASH_EN2_SHIFT;
+	} else if (mode & MAX77693_MODE_FLASH_EXTERNAL) {
+		if (p->trigger[FLASH1] & MAX77693_LED_TRIG_EXT)
+			v |= MAX77693_FLASH_EN_FLASH << MAX77693_FLASH_EN1_SHIFT;
+		if (p->trigger[FLASH2] & MAX77693_LED_TRIG_EXT)
+			v |= MAX77693_FLASH_EN_FLASH << MAX77693_FLASH_EN2_SHIFT;
+		/*
+		 * Enable hw triggering also for torch mode, as some camera
+		 * sensors use torch led to fathom ambient light conditions
+		 * before strobing the flash.
+		 */
+		if (p->trigger[TORCH1] & MAX77693_LED_TRIG_EXT)
+			v |= MAX77693_FLASH_EN_TORCH << MAX77693_TORCH_EN1_SHIFT;
+		if (p->trigger[TORCH2] & MAX77693_LED_TRIG_EXT)
+			v |= MAX77693_FLASH_EN_TORCH << MAX77693_TORCH_EN2_SHIFT;
+	}
+
+	/* Reset the register only prior setting flash modes */
+	if (mode != MAX77693_MODE_TORCH) {
+		ret = max77693_write_reg(rmap, MAX77693_LED_REG_FLASH_EN, 0);
+		if (ret < 0)
+			return ret;
+	}
+
+	return max77693_write_reg(rmap, MAX77693_LED_REG_FLASH_EN, v);
+}
+
+static int max77693_add_mode(struct max77693_led *led, unsigned int mode)
+{
+	int ret;
+
+	/* Once enabled torch mode is active until turned off */
+	if ((mode == MAX77693_MODE_TORCH) &&
+	    (led->mode_flags & MAX77693_MODE_TORCH))
+		return 0;
+
+	/*
+	 * FLASH_EXTERNAL mode activates HW triggered flash and torch
+	 * modes in the device. The related register settings interfere
+	 * with SW triggerred modes, thus clear them to ensure proper
+	 * device configuration.
+	 */
+	if (mode == MAX77693_MODE_FLASH_EXTERNAL)
+		led->mode_flags &= (~MAX77693_MODE_TORCH &
+				    ~MAX77693_MODE_FLASH);
+
+	led->mode_flags |= mode;
+
+	ret = max77693_set_mode(led, led->mode_flags);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * Clear flash mode flag after setting the mode to avoid
+	 * spurous flash strobing on each successive torch mode
+	 * setting.
+	 */
+	if ((mode == MAX77693_MODE_FLASH) ||
+	    (mode == MAX77693_MODE_FLASH_EXTERNAL))
+		led->mode_flags &= ~mode;
+
+	return 0;
+}
+
+static int max77693_clear_mode(struct max77693_led *led, unsigned int mode)
+{
+	led->mode_flags &= ~mode;
+
+	return max77693_set_mode(led, led->mode_flags);
+}
+
+static int max77693_set_torch_current(struct max77693_led *led,
+					u32 micro_amp)
+{
+	struct max77693_led_platform_data *p = led->pdata;
+	struct regmap *rmap = led->regmap;
+	u32 iout[2];
+	u8 v, iout1_reg, iout2_reg;
+	int ret;
+
+	max77693_calc_iout(iout, micro_amp, &p->iout[TORCH1]);
+	iout1_reg = max77693_led_iout_to_reg(iout[0]);
+	iout2_reg = max77693_led_iout_to_reg(iout[1]);
+
+	v = iout1_reg | (iout2_reg << MAX77693_TORCH_IOUT_BITS);
+	ret = max77693_write_reg(rmap, MAX77693_LED_REG_ITORCH, v);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int max77693_set_flash_current(struct max77693_led *led,
+					u32 micro_amp)
+{
+	struct max77693_led_platform_data *p = led->pdata;
+	struct regmap *rmap = led->regmap;
+	u32 iout[2];
+	u8 iout1_reg, iout2_reg;
+	int ret;
+
+	max77693_calc_iout(iout, micro_amp, &p->iout[FLASH1]);
+	iout1_reg = max77693_led_iout_to_reg(iout[0]);
+	iout2_reg = max77693_led_iout_to_reg(iout[1]);
+
+	ret = max77693_write_reg(rmap, MAX77693_LED_REG_IFLASH1, iout1_reg);
+	if (ret < 0)
+		goto error_ret;
+	ret = max77693_write_reg(rmap, MAX77693_LED_REG_IFLASH2, iout2_reg);
+	if (ret < 0)
+		goto error_ret;
+
+error_ret:
+	return ret;
+}
+
+static int max77693_set_timeout(struct max77693_led *led,
+				u32 timeout)
+{
+	struct max77693_led_platform_data *p = led->pdata;
+	struct regmap *rmap = led->regmap;
+	u8 v;
+
+	v = max77693_flash_timeout_to_reg(timeout);
+
+	if (p->trigger_type[FLASH] == MAX77693_LED_TRIG_TYPE_LEVEL)
+		v |= MAX77693_FLASH_TIMER_LEVEL;
+
+	return max77693_write_reg(rmap, MAX77693_LED_REG_FLASH_TIMER, v);
+}
+
+static int max77693_strobe_status_get(struct max77693_led *led)
+{
+	struct regmap *rmap = led->regmap;
+	u8 v;
+	int ret;
+
+	ret = max77693_read_reg(rmap, MAX77693_LED_REG_FLASH_INT_STATUS, &v);
+	if (ret < 0)
+		return ret;
+
+	return !!(v & MAX77693_LED_STATUS_FLASH_ON);
+}
+
+static int max77693_int_flag_get(struct max77693_led *led, u8 *v)
+{
+	struct regmap *rmap = led->regmap;
+
+	return max77693_read_reg(rmap, MAX77693_LED_REG_FLASH_INT, v);
+}
+
+static int max77693_setup(struct max77693_led *led)
+{
+	struct max77693_led_platform_data *p = led->pdata;
+	struct regmap *rmap = led->regmap;
+	int ret;
+	u8 v;
+
+	ret = max77693_set_torch_current(led, p->iout[TORCH1] +
+						p->iout[TORCH2]);
+	if (ret < 0)
+		return ret;
+
+	ret = max77693_set_flash_current(led, p->iout[FLASH1] +
+						p->iout[FLASH2]);
+	if (ret < 0)
+		return ret;
+
+	if (p->timeout[TORCH] > 0)
+		v = max77693_torch_timeout_to_reg(p->timeout[TORCH]);
+	else
+		v = MAX77693_TORCH_NO_TIMER;
+	if (p->trigger_type[TORCH] == MAX77693_LED_TRIG_TYPE_LEVEL)
+		v |= MAX77693_FLASH_TIMER_LEVEL;
+	ret = max77693_write_reg(rmap, MAX77693_LED_REG_ITORCHTIMER, v);
+	if (ret < 0)
+		return ret;
+
+	v = max77693_flash_timeout_to_reg(p->timeout[FLASH]);
+	if (p->trigger_type[FLASH] == MAX77693_LED_TRIG_TYPE_LEVEL)
+		v |= MAX77693_FLASH_TIMER_LEVEL;
+	ret = max77693_write_reg(rmap, MAX77693_LED_REG_FLASH_TIMER, v);
+	if (ret < 0)
+		return ret;
+
+	if (p->low_vsys > 0)
+		v = max77693_led_vsys_to_reg(p->low_vsys) |
+						MAX77693_FLASH_LOW_BATTERY_EN;
+	else
+		v = 0;
+
+	ret = max77693_write_reg(rmap, MAX77693_LED_REG_MAX_FLASH1, v);
+	if (ret < 0)
+		return ret;
+	ret = max77693_write_reg(rmap, MAX77693_LED_REG_MAX_FLASH2, 0);
+	if (ret < 0)
+		return ret;
+
+	if (p->boost_mode[FLASH1] == MAX77693_LED_BOOST_FIXED ||
+	    p->boost_mode[FLASH2] == MAX77693_LED_BOOST_FIXED)
+		v = MAX77693_FLASH_BOOST_FIXED;
+	else
+		v = p->boost_mode[FLASH1] | (p->boost_mode[FLASH2] << 1);
+	if (p->boost_mode[FLASH1] && p->boost_mode[FLASH2])
+		v |= MAX77693_FLASH_BOOST_LEDNUM_2;
+	ret = max77693_write_reg(rmap, MAX77693_LED_REG_VOUT_CNTL, v);
+	if (ret < 0)
+		return ret;
+
+	v = max77693_led_vout_to_reg(p->boost_vout);
+	ret = max77693_write_reg(rmap, MAX77693_LED_REG_VOUT_FLASH1, v);
+	if (ret < 0)
+		return ret;
+
+	return max77693_set_mode(led, MAX77693_MODE_OFF);
+}
+
+/* LED subsystem callbacks */
+
+static void max77693_brightness_set_work(struct work_struct *work)
+{
+	struct max77693_led *led =
+		container_of(work, struct max77693_led, work_brightness_set);
+	int ret;
+
+	mutex_lock(&led->lock);
+
+	if (led->torch_brightness == 0) {
+		ret = max77693_clear_mode(led, MAX77693_MODE_TORCH);
+		if (ret < 0)
+			dev_dbg(&led->pdev->dev,
+				"Failed to clear torch mode (%d)\n",
+				ret);
+		goto unlock;
+	}
+
+	ret = max77693_set_torch_current(led, led->torch_brightness *
+						MAX77693_TORCH_IOUT_STEP);
+	if (ret < 0) {
+		dev_dbg(&led->pdev->dev, "Failed to set torch current (%d)\n",
+			ret);
+		goto unlock;
+	}
+
+	ret = max77693_add_mode(led, MAX77693_MODE_TORCH);
+	if (ret < 0)
+		dev_dbg(&led->pdev->dev, "Failed to set torch mode (%d)\n",
+			ret);
+unlock:
+	mutex_unlock(&led->lock);
+}
+
+static void max77693_led_brightness_set(struct led_classdev *led_cdev,
+				enum led_brightness value)
+{
+	struct max77693_led *led = ldev_to_led(led_cdev);
+
+	led->torch_brightness = value;
+	schedule_work(&led->work_brightness_set);
+}
+
+static int max77693_led_flash_strobe_get(struct led_classdev *led_cdev)
+{
+	struct max77693_led *led = ldev_to_led(led_cdev);
+	int ret;
+
+	mutex_lock(&led->lock);
+	ret = max77693_strobe_status_get(led);
+	mutex_unlock(&led->lock);
+
+	return ret;
+}
+
+static int max77693_led_flash_fault_get(struct led_classdev *led_cdev,
+					u32 *fault)
+{
+	struct max77693_led *led = ldev_to_led(led_cdev);
+	u8 v;
+	int ret;
+
+	mutex_lock(&led->lock);
+
+	ret = max77693_int_flag_get(led, &v);
+	if (ret < 0)
+		goto unlock;
+
+	*fault = 0;
+
+	if (v & MAX77693_LED_FLASH_INT_FLED2_OPEN ||
+	    v & MAX77693_LED_FLASH_INT_FLED1_OPEN)
+		*fault |= LED_FAULT_OVER_VOLTAGE;
+	if (v & MAX77693_LED_FLASH_INT_FLED2_SHORT ||
+	    v & MAX77693_LED_FLASH_INT_FLED1_SHORT)
+		*fault |= LED_FAULT_SHORT_CIRCUIT;
+	if (v & MAX77693_LED_FLASH_INT_OVER_CURRENT)
+		*fault |= LED_FAULT_OVER_CURRENT;
+unlock:
+	mutex_unlock(&led->lock);
+	return ret;
+}
+
+static int max77693_led_flash_strobe_set(struct led_classdev *led_cdev,
+						bool state)
+{
+	struct max77693_led *led = ldev_to_led(led_cdev);
+	struct led_flash *flash = led_cdev->flash;
+	int ret;
+
+	mutex_lock(&led->lock);
+
+	if (flash->external_strobe) {
+		ret = -EBUSY;
+		goto unlock;
+	}
+
+	if (!state) {
+		ret = max77693_clear_mode(led, MAX77693_MODE_FLASH);
+		goto unlock;
+	}
+
+	ret = max77693_add_mode(led, MAX77693_MODE_FLASH);
+	if (ret < 0)
+		goto unlock;
+unlock:
+	mutex_unlock(&led->lock);
+	return ret;
+}
+
+static int max77693_led_external_strobe_set(struct led_classdev *led_cdev,
+						bool enable)
+{
+	struct max77693_led *led = ldev_to_led(led_cdev);
+	int ret;
+
+	mutex_lock(&led->lock);
+
+	if (enable)
+		ret = max77693_add_mode(led, MAX77693_MODE_FLASH_EXTERNAL);
+	else
+		ret = max77693_clear_mode(led, MAX77693_MODE_FLASH_EXTERNAL);
+
+	mutex_unlock(&led->lock);
+
+	return ret;
+}
+
+static int max77693_led_flash_brightness_set(struct led_classdev *led_cdev,
+						u32 brightness)
+{
+	struct max77693_led *led = ldev_to_led(led_cdev);
+	int ret;
+
+	mutex_lock(&led->lock);
+
+	ret = max77693_set_flash_current(led, brightness);
+	if (ret < 0)
+		goto unlock;
+unlock:
+	mutex_unlock(&led->lock);
+	return ret;
+}
+
+static int max77693_led_flash_timeout_set(struct led_classdev *led_cdev,
+						u32 timeout)
+{
+	struct max77693_led *led = ldev_to_led(led_cdev);
+	int ret;
+
+	mutex_lock(&led->lock);
+
+	ret = max77693_set_timeout(led, timeout);
+	if (ret < 0)
+		goto unlock;
+
+unlock:
+	mutex_unlock(&led->lock);
+	return ret;
+}
+
+static void max77693_led_parse_dt(struct max77693_led_platform_data *p,
+			    struct device_node *node)
+{
+	of_property_read_u32_array(node, "maxim,iout", p->iout, 4);
+	of_property_read_u32_array(node, "maxim,trigger", p->trigger, 4);
+	of_property_read_u32_array(node, "maxim,trigger-type", p->trigger_type,
+									2);
+	of_property_read_u32_array(node, "maxim,timeout", p->timeout, 2);
+	of_property_read_u32_array(node, "maxim,boost-mode", p->boost_mode, 2);
+	of_property_read_u32(node, "maxim,boost-vout", &p->boost_vout);
+	of_property_read_u32(node, "maxim,vsys-min", &p->low_vsys);
+}
+
+static void clamp_align(u32 *v, u32 min, u32 max, u32 step)
+{
+	*v = clamp_val(*v, min, max);
+	if (step > 1)
+		*v = (*v - min) / step * step + min;
+}
+
+static void max77693_led_validate_platform_data(
+					struct max77693_led_platform_data *p)
+{
+	u32 max;
+	int i;
+
+	for (i = 0; i < 2; ++i)
+		clamp_align(&p->boost_mode[i], MAX77693_LED_BOOST_NONE,
+			    MAX77693_LED_BOOST_FIXED, 1);
+	/* boost, if enabled, should be the same on both leds */
+	if (p->boost_mode[0] != MAX77693_LED_BOOST_NONE &&
+	    p->boost_mode[1] != MAX77693_LED_BOOST_NONE)
+		p->boost_mode[1] = p->boost_mode[0];
+
+	max = (p->boost_mode[FLASH1] && p->boost_mode[FLASH2]) ?
+		  MAX77693_FLASH_IOUT_MAX_2LEDS : MAX77693_FLASH_IOUT_MAX_1LED;
+
+	clamp_align(&p->iout[FLASH1], MAX77693_FLASH_IOUT_MIN,
+		    max, MAX77693_FLASH_IOUT_STEP);
+	clamp_align(&p->iout[FLASH2], MAX77693_FLASH_IOUT_MIN,
+		    max, MAX77693_FLASH_IOUT_STEP);
+	clamp_align(&p->iout[TORCH1], MAX77693_TORCH_IOUT_MIN,
+		    MAX77693_TORCH_IOUT_MAX, MAX77693_TORCH_IOUT_STEP);
+	clamp_align(&p->iout[TORCH2], MAX77693_TORCH_IOUT_MIN,
+		    MAX77693_TORCH_IOUT_MAX, MAX77693_TORCH_IOUT_STEP);
+
+	for (i = 0; i < 4; ++i)
+		clamp_align(&p->trigger[i], 0, 7, 1);
+	for (i = 0; i < 2; ++i)
+		clamp_align(&p->trigger_type[i], MAX77693_LED_TRIG_TYPE_EDGE,
+			    MAX77693_LED_TRIG_TYPE_LEVEL, 1);
+
+	clamp_align(&p->timeout[FLASH], MAX77693_FLASH_TIMEOUT_MIN,
+		    MAX77693_FLASH_TIMEOUT_MAX, MAX77693_FLASH_TIMEOUT_STEP);
+
+	if (p->timeout[TORCH]) {
+		clamp_align(&p->timeout[TORCH], MAX77693_TORCH_TIMEOUT_MIN,
+			    MAX77693_TORCH_TIMEOUT_MAX, 1);
+		p->timeout[TORCH] = max77693_torch_timeout_from_reg(
+			      max77693_torch_timeout_to_reg(p->timeout[TORCH]));
+	}
+
+	clamp_align(&p->boost_vout, MAX77693_FLASH_VOUT_MIN,
+		    MAX77693_FLASH_VOUT_MAX, MAX77693_FLASH_VOUT_STEP);
+
+	if (p->low_vsys) {
+		clamp_align(&p->low_vsys, MAX77693_FLASH_VSYS_MIN,
+			    MAX77693_FLASH_VSYS_MAX, MAX77693_FLASH_VSYS_STEP);
+	}
+}
+
+static int max77693_led_get_platform_data(struct max77693_led *led)
+{
+	struct max77693_led_platform_data *p;
+	struct device *dev = &led->pdev->dev;
+
+	if (dev->of_node) {
+		p = devm_kzalloc(dev, sizeof(*led->pdata), GFP_KERNEL);
+		if (!p)
+			return -ENOMEM;
+		max77693_led_parse_dt(p, dev->of_node);
+	} else {
+		p = dev_get_platdata(dev);
+		if (!p)
+			return -ENODEV;
+	}
+	led->pdata = p;
+
+	max77693_led_validate_platform_data(p);
+
+	return 0;
+}
+
+static struct led_flash led_flash = {
+	.ops = {
+		.brightness_set		= max77693_led_flash_brightness_set,
+		.strobe_set		= max77693_led_flash_strobe_set,
+		.strobe_get		= max77693_led_flash_strobe_get,
+		.timeout_set		= max77693_led_flash_timeout_set,
+		.external_strobe_set	= max77693_led_external_strobe_set,
+		.fault_get		= max77693_led_flash_fault_get,
+	},
+	.has_flash_led = true,
+};
+
+static void max77693_init_led_controls(struct led_classdev *led_cdev,
+					struct max77693_led_platform_data *p)
+{
+	struct led_flash *flash = led_cdev->flash;
+	struct led_ctrl *c;
+
+	/*
+	 * brightness_ctrl and fault_flags are used only
+	 * for initializing related V4L2 controls.
+	 */
+#ifdef CONFIG_V4L2_FLASH
+	flash->fault_flags = V4L2_FLASH_FAULT_OVER_VOLTAGE |
+			     V4L2_FLASH_FAULT_SHORT_CIRCUIT |
+			     V4L2_FLASH_FAULT_OVER_CURRENT;
+
+	c = &led_cdev->brightness_ctrl;
+	c->min = (p->iout[TORCH1] != 0 && p->iout[TORCH2] != 0) ?
+					MAX77693_TORCH_IOUT_MIN * 2 :
+					MAX77693_TORCH_IOUT_MIN;
+	c->max = p->iout[TORCH1] + p->iout[TORCH2];
+	c->step = MAX77693_TORCH_IOUT_STEP;
+	c->val = p->iout[TORCH1] + p->iout[TORCH2];
+#endif
+
+	c = &flash->brightness;
+	c->min = (p->iout[FLASH1] != 0 && p->iout[FLASH2] != 0) ?
+					MAX77693_FLASH_IOUT_MIN * 2 :
+					MAX77693_FLASH_IOUT_MIN;
+	c->max = p->iout[FLASH1] + p->iout[FLASH2];
+	c->step = MAX77693_FLASH_IOUT_STEP;
+	c->val = p->iout[FLASH1] + p->iout[FLASH2];
+
+	c = &flash->timeout;
+	c->min = MAX77693_FLASH_TIMEOUT_MIN;
+	c->max = MAX77693_FLASH_TIMEOUT_MAX;
+	c->step = MAX77693_FLASH_TIMEOUT_STEP;
+	c->val = p->timeout[FLASH];
+
+}
+
+static int max77693_led_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct max77693_dev *iodev = dev_get_drvdata(dev->parent);
+	struct max77693_led *led;
+	struct max77693_led_platform_data *p;
+	struct led_classdev *led_cdev;
+	int ret;
+
+	led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	led->pdev = pdev;
+	led_cdev = &led->ldev;
+	led->regmap = iodev->regmap;
+	platform_set_drvdata(pdev, led);
+	ret = max77693_led_get_platform_data(led);
+	if (ret < 0)
+		return -EINVAL;
+	p = led->pdata;
+
+	mutex_init(&led->lock);
+
+	INIT_WORK(&led->work_brightness_set, max77693_brightness_set_work);
+
+	/* LED class device initialization */
+	led_cdev->name = MAX77693_LED_NAME;
+	led_cdev->brightness_set = max77693_led_brightness_set;
+	led_cdev->max_brightness = (p->iout[TORCH1] + p->iout[TORCH2]) /
+						MAX77693_TORCH_IOUT_STEP;
+
+	if ((p->trigger[FLASH1] & MAX77693_LED_TRIG_FLASH) ||
+	    (p->trigger[FLASH2] & MAX77693_LED_TRIG_FLASH))
+		led_flash.has_external_strobe = true;
+	led_cdev->flash = &led_flash;
+
+	max77693_init_led_controls(led_cdev, p);
+
+	/* Register in the LED subsystem. */
+	ret = led_classdev_flash_register(&pdev->dev, led_cdev);
+	if (ret < 0)
+		return -EINVAL;
+
+	ret = max77693_setup(led);
+
+	return 0;
+}
+
+static int max77693_led_remove(struct platform_device *pdev)
+{
+	struct max77693_led *led = platform_get_drvdata(pdev);
+
+	led_classdev_flash_unregister(&led->ldev);
+
+	return 0;
+}
+
+static struct of_device_id max77693_led_dt_match[] = {
+	{.compatible = "maxim,max77693-flash"},
+	{},
+};
+
+static struct platform_driver max77693_led_driver = {
+	.probe		= max77693_led_probe,
+	.remove		= max77693_led_remove,
+	.driver		= {
+		.name	= "max77693-flash",
+		.owner	= THIS_MODULE,
+		.of_match_table = max77693_led_dt_match,
+	},
+};
+
+module_platform_driver(max77693_led_driver);
+
+MODULE_AUTHOR("Andrzej Hajda <a.hajda@...sung.com>");
+MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@...sung.com>");
+MODULE_DESCRIPTION("Maxim MAX77693 led flash driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/mfd/max77693.c b/drivers/mfd/max77693.c
index c5535f0..f061aa8 100644
--- a/drivers/mfd/max77693.c
+++ b/drivers/mfd/max77693.c
@@ -44,7 +44,7 @@
 static const struct mfd_cell max77693_devs[] = {
 	{ .name = "max77693-pmic", },
 	{ .name = "max77693-charger", },
-	{ .name = "max77693-flash", },
+	{ .name = "max77693-flash", .of_compatible = "maxim,max77693-flash", },
 	{ .name = "max77693-muic", },
 	{ .name = "max77693-haptic", },
 };
diff --git a/include/linux/mfd/max77693.h b/include/linux/mfd/max77693.h
index 3f3dc45..f2285b7 100644
--- a/include/linux/mfd/max77693.h
+++ b/include/linux/mfd/max77693.h
@@ -63,6 +63,43 @@ struct max77693_muic_platform_data {
 	int path_uart;
 };
 
+/* MAX77693 led flash */
+
+/* triggers */
+enum max77693_led_trigger {
+	MAX77693_LED_TRIG_OFF,
+	MAX77693_LED_TRIG_FLASH,
+	MAX77693_LED_TRIG_TORCH,
+	MAX77693_LED_TRIG_EXT,
+	MAX77693_LED_TRIG_SOFT,
+};
+
+
+/* trigger types */
+enum max77693_led_trigger_type {
+	MAX77693_LED_TRIG_TYPE_EDGE,
+	MAX77693_LED_TRIG_TYPE_LEVEL,
+};
+
+/* boost modes */
+enum max77693_led_boost_mode {
+	MAX77693_LED_BOOST_NONE,
+	MAX77693_LED_BOOST_ADAPTIVE,
+	MAX77693_LED_BOOST_FIXED,
+};
+
+struct max77693_led_platform_data {
+	u32 iout[4];
+	u32 trigger[4];
+	u32 trigger_type[2];
+	u32 timeout[2];
+	u32 boost_mode[2];
+	u32 boost_vout;
+	u32 low_vsys;
+};
+
+/* MAX77693 */
+
 struct max77693_platform_data {
 	/* regulator data */
 	struct max77693_regulator_data *regulators;
@@ -70,5 +107,6 @@ struct max77693_platform_data {
 
 	/* muic data */
 	struct max77693_muic_platform_data *muic_data;
+	struct max77693_led_platform_data *led_data;
 };
 #endif	/* __LINUX_MFD_MAX77693_H */
-- 
1.7.9.5

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