Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds

Pull LED subsystem update from Bryan Wu:
"The big change of LED subsystem is introducing a new LED class for
Flash type LEDs which will be used for V4L2 subsystem.

Also we got some cleanup and fixes"

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds:
leds: leds-gpio: Pass on error codes unmodified
DT: leds: Add led-sources property
leds: Add LED Flash class extension to the LED subsystem
leds: leds-mc13783: Use of_get_child_by_name() instead of refcount hack
leds: Use setup_timer
leds: Don't allow brightness values greater than max_brightness
DT: leds: Add flash LED devices related properties

Documentation/devicetree/bindings/leds/common.txt

···
 Common leds properties.
 
+LED and flash LED devices provide the same basic functionality as current
+regulators, but extended with LED and flash LED specific features like
+blinking patterns, flash timeout, flash faults and external flash strobe mode.
+
+Many LED devices expose more than one current output that can be connected
+to one or more discrete LED component. Since the arrangement of connections
+can influence the way of the LED device initialization, the LED components
+have to be tightly coupled with the LED device binding. They are represented
+by child nodes of the parent LED device binding.
+
 Optional properties for child nodes:
+- led-sources : List of device current outputs the LED is connected to. The
+		outputs are identified by the numbers that must be defined
+		in the LED device binding documentation.
 - label : The label for this LED.  If omitted, the label is
   taken from the node name (excluding the unit address).
 
···
      "ide-disk" - LED indicates disk activity
      "timer" - LED flashes at a fixed, configurable rate
 
+- max-microamp : maximum intensity in microamperes of the LED
+		 (torch LED for flash devices)
+- flash-max-microamp : maximum intensity in microamperes of the
+                       flash LED; it is mandatory if the LED should
+		       support the flash mode
+- flash-timeout-us : timeout in microseconds after which the flash
+                     LED is turned off
+
+
 Examples:
 
 system-status {
 	label = "Status";
 	linux,default-trigger = "heartbeat";
 	...
+};
+
+camera-flash {
+	label = "Flash";
+	led-sources = <0>, <1>;
+	max-microamp = <50000>;
+	flash-max-microamp = <320000>;
+	flash-timeout-us = <500000>;
 };

drivers/leds/Kconfig

···
 	  This option enables the led sysfs class in /sys/class/leds.  You'll
 	  need this to do anything useful with LEDs.  If unsure, say N.
 
+config LEDS_CLASS_FLASH
+	tristate "LED Flash Class Support"
+	depends on LEDS_CLASS
+	help
+	  This option enables the flash led sysfs class in /sys/class/leds.
+	  It wrapps LED Class and adds flash LEDs specific sysfs attributes
+	  and kernel internal API to it. You'll need this to provide support
+	  for the flash related features of a LED device. It can be built
+	  as a module.
+
 comment "LED drivers"
 
 config LEDS_88PM860X

drivers/leds/Makefile

···
 # LED Core
 obj-$(CONFIG_NEW_LEDS)			+= led-core.o
 obj-$(CONFIG_LEDS_CLASS)		+= led-class.o
+obj-$(CONFIG_LEDS_CLASS_FLASH)		+= led-class-flash.o
 obj-$(CONFIG_LEDS_TRIGGERS)		+= led-triggers.o
 
 # LED Platform Drivers

drivers/leds/led-class-flash.c

···
+/*
+ * LED Flash class interface
+ *
+ * Copyright (C) 2015 Samsung Electronics Co., Ltd.
+ * Author: Jacek Anaszewski <[e-mail]>
+ *
+ * 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/device.h>
+#include <linux/init.h>
+#include <linux/led-class-flash.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "leds.h"
+
+#define has_flash_op(fled_cdev, op)				\
+	(fled_cdev && fled_cdev->ops->op)
+
+#define call_flash_op(fled_cdev, op, args...)		\
+	((has_flash_op(fled_cdev, op)) ?			\
+			(fled_cdev->ops->op(fled_cdev, args)) :	\
+			-EINVAL)
+
+static const char * const led_flash_fault_names[] = {
+	"led-over-voltage",
+	"flash-timeout-exceeded",
+	"controller-over-temperature",
+	"controller-short-circuit",
+	"led-power-supply-over-current",
+	"indicator-led-fault",
+	"led-under-voltage",
+	"controller-under-voltage",
+	"led-over-temperature",
+};
+
+static ssize_t flash_brightness_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+	unsigned long state;
+	ssize_t ret;
+
+	mutex_lock(&led_cdev->led_access);
+
+	if (led_sysfs_is_disabled(led_cdev)) {
+		ret = -EBUSY;
+		goto unlock;
+	}
+
+	ret = kstrtoul(buf, 10, &state);
+	if (ret)
+		goto unlock;
+
+	ret = led_set_flash_brightness(fled_cdev, state);
+	if (ret < 0)
+		goto unlock;
+
+	ret = size;
+unlock:
+	mutex_unlock(&led_cdev->led_access);
+	return ret;
+}
+
+static ssize_t flash_brightness_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+
+	/* no lock needed for this */
+	led_update_flash_brightness(fled_cdev);
+
+	return sprintf(buf, "%u\n", fled_cdev->brightness.val);
+}
+static DEVICE_ATTR_RW(flash_brightness);
+
+static ssize_t max_flash_brightness_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+
+	return sprintf(buf, "%u\n", fled_cdev->brightness.max);
+}
+static DEVICE_ATTR_RO(max_flash_brightness);
+
+static ssize_t flash_strobe_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+	unsigned long state;
+	ssize_t ret = -EINVAL;
+
+	mutex_lock(&led_cdev->led_access);
+
+	if (led_sysfs_is_disabled(led_cdev)) {
+		ret = -EBUSY;
+		goto unlock;
+	}
+
+	ret = kstrtoul(buf, 10, &state);
+	if (ret)
+		goto unlock;
+
+	if (state < 0 || state > 1) {
+		ret = -EINVAL;
+		goto unlock;
+	}
+
+	ret = led_set_flash_strobe(fled_cdev, state);
+	if (ret < 0)
+		goto unlock;
+	ret = size;
+unlock:
+	mutex_unlock(&led_cdev->led_access);
+	return ret;
+}
+
+static ssize_t flash_strobe_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+	bool state;
+	int ret;
+
+	/* no lock needed for this */
+	ret = led_get_flash_strobe(fled_cdev, &state);
+	if (ret < 0)
+		return ret;
+
+	return sprintf(buf, "%u\n", state);
+}
+static DEVICE_ATTR_RW(flash_strobe);
+
+static ssize_t flash_timeout_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+	unsigned long flash_timeout;
+	ssize_t ret;
+
+	mutex_lock(&led_cdev->led_access);
+
+	if (led_sysfs_is_disabled(led_cdev)) {
+		ret = -EBUSY;
+		goto unlock;
+	}
+
+	ret = kstrtoul(buf, 10, &flash_timeout);
+	if (ret)
+		goto unlock;
+
+	ret = led_set_flash_timeout(fled_cdev, flash_timeout);
+	if (ret < 0)
+		goto unlock;
+
+	ret = size;
+unlock:
+	mutex_unlock(&led_cdev->led_access);
+	return ret;
+}
+
+static ssize_t flash_timeout_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+
+	return sprintf(buf, "%u\n", fled_cdev->timeout.val);
+}
+static DEVICE_ATTR_RW(flash_timeout);
+
+static ssize_t max_flash_timeout_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+
+	return sprintf(buf, "%u\n", fled_cdev->timeout.max);
+}
+static DEVICE_ATTR_RO(max_flash_timeout);
+
+static ssize_t flash_fault_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+	u32 fault, mask = 0x1;
+	char *pbuf = buf;
+	int i, ret, buf_len;
+
+	ret = led_get_flash_fault(fled_cdev, &fault);
+	if (ret < 0)
+		return -EINVAL;
+
+	*buf = '\0';
+
+	for (i = 0; i < LED_NUM_FLASH_FAULTS; ++i) {
+		if (fault & mask) {
+			buf_len = sprintf(pbuf, "%s ",
+					  led_flash_fault_names[i]);
+			pbuf += buf_len;
+		}
+		mask <<= 1;
+	}
+
+	return sprintf(buf, "%s\n", buf);
+}
+static DEVICE_ATTR_RO(flash_fault);
+
+static ssize_t available_sync_leds_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+	char *pbuf = buf;
+	int i, buf_len;
+
+	buf_len = sprintf(pbuf, "[0: none] ");
+	pbuf += buf_len;
+
+	for (i = 0; i < fled_cdev->num_sync_leds; ++i) {
+		buf_len = sprintf(pbuf, "[%d: %s] ", i + 1,
+				  fled_cdev->sync_leds[i]->led_cdev.name);
+		pbuf += buf_len;
+	}
+
+	return sprintf(buf, "%s\n", buf);
+}
+static DEVICE_ATTR_RO(available_sync_leds);
+
+static ssize_t flash_sync_strobe_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+	unsigned long led_id;
+	ssize_t ret;
+
+	mutex_lock(&led_cdev->led_access);
+
+	if (led_sysfs_is_disabled(led_cdev)) {
+		ret = -EBUSY;
+		goto unlock;
+	}
+
+	ret = kstrtoul(buf, 10, &led_id);
+	if (ret)
+		goto unlock;
+
+	if (led_id > fled_cdev->num_sync_leds) {
+		ret = -ERANGE;
+		goto unlock;
+	}
+
+	fled_cdev->sync_led_id = led_id;
+
+	ret = size;
+unlock:
+	mutex_unlock(&led_cdev->led_access);
+	return ret;
+}
+
+static ssize_t flash_sync_strobe_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+	int sled_id = fled_cdev->sync_led_id;
+	char *sync_led_name = "none";
+
+	if (fled_cdev->sync_led_id > 0)
+		sync_led_name = (char *)
+			fled_cdev->sync_leds[sled_id - 1]->led_cdev.name;
+
+	return sprintf(buf, "[%d: %s]\n", sled_id, sync_led_name);
+}
+static DEVICE_ATTR_RW(flash_sync_strobe);
+
+static struct attribute *led_flash_strobe_attrs[] = {
+	&dev_attr_flash_strobe.attr,
+	NULL,
+};
+
+static struct attribute *led_flash_timeout_attrs[] = {
+	&dev_attr_flash_timeout.attr,
+	&dev_attr_max_flash_timeout.attr,
+	NULL,
+};
+
+static struct attribute *led_flash_brightness_attrs[] = {
+	&dev_attr_flash_brightness.attr,
+	&dev_attr_max_flash_brightness.attr,
+	NULL,
+};
+
+static struct attribute *led_flash_fault_attrs[] = {
+	&dev_attr_flash_fault.attr,
+	NULL,
+};
+
+static struct attribute *led_flash_sync_strobe_attrs[] = {
+	&dev_attr_available_sync_leds.attr,
+	&dev_attr_flash_sync_strobe.attr,
+	NULL,
+};
+
+static const struct attribute_group led_flash_strobe_group = {
+	.attrs = led_flash_strobe_attrs,
+};
+
+static const struct attribute_group led_flash_timeout_group = {
+	.attrs = led_flash_timeout_attrs,
+};
+
+static const struct attribute_group led_flash_brightness_group = {
+	.attrs = led_flash_brightness_attrs,
+};
+
+static const struct attribute_group led_flash_fault_group = {
+	.attrs = led_flash_fault_attrs,
+};
+
+static const struct attribute_group led_flash_sync_strobe_group = {
+	.attrs = led_flash_sync_strobe_attrs,
+};
+
+static void led_flash_resume(struct led_classdev *led_cdev)
+{
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+
+	call_flash_op(fled_cdev, flash_brightness_set,
+					fled_cdev->brightness.val);
+	call_flash_op(fled_cdev, timeout_set, fled_cdev->timeout.val);
+}
+
+static void led_flash_init_sysfs_groups(struct led_classdev_flash *fled_cdev)
+{
+	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
+	const struct led_flash_ops *ops = fled_cdev->ops;
+	const struct attribute_group **flash_groups = fled_cdev->sysfs_groups;
+
+	int num_sysfs_groups = 0;
+
+	flash_groups[num_sysfs_groups++] = &led_flash_strobe_group;
+
+	if (ops->flash_brightness_set)
+		flash_groups[num_sysfs_groups++] = &led_flash_brightness_group;
+
+	if (ops->timeout_set)
+		flash_groups[num_sysfs_groups++] = &led_flash_timeout_group;
+
+	if (ops->fault_get)
+		flash_groups[num_sysfs_groups++] = &led_flash_fault_group;
+
+	if (led_cdev->flags & LED_DEV_CAP_SYNC_STROBE)
+		flash_groups[num_sysfs_groups++] = &led_flash_sync_strobe_group;
+
+	led_cdev->groups = flash_groups;
+}
+
+int led_classdev_flash_register(struct device *parent,
+				struct led_classdev_flash *fled_cdev)
+{
+	struct led_classdev *led_cdev;
+	const struct led_flash_ops *ops;
+	int ret;
+
+	if (!fled_cdev)
+		return -EINVAL;
+
+	led_cdev = &fled_cdev->led_cdev;
+
+	if (led_cdev->flags & LED_DEV_CAP_FLASH) {
+		if (!led_cdev->brightness_set_sync)
+			return -EINVAL;
+
+		ops = fled_cdev->ops;
+		if (!ops || !ops->strobe_set)
+			return -EINVAL;
+
+		led_cdev->flash_resume = led_flash_resume;
+
+		/* Select the sysfs attributes to be created for the device */
+		led_flash_init_sysfs_groups(fled_cdev);
+	}
+
+	/* Register led class device */
+	ret = led_classdev_register(parent, led_cdev);
+	if (ret < 0)
+		return ret;
+
+	/* Setting a torch brightness needs to have immediate effect */
+	led_cdev->flags &= ~SET_BRIGHTNESS_ASYNC;
+	led_cdev->flags |= SET_BRIGHTNESS_SYNC;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(led_classdev_flash_register);
+
+void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev)
+{
+	if (!fled_cdev)
+		return;
+
+	led_classdev_unregister(&fled_cdev->led_cdev);
+}
+EXPORT_SYMBOL_GPL(led_classdev_flash_unregister);
+
+static void led_clamp_align(struct led_flash_setting *s)
+{
+	u32 v, offset;
+
+	v = s->val + s->step / 2;
+	v = clamp(v, s->min, s->max);
+	offset = v - s->min;
+	offset = s->step * (offset / s->step);
+	s->val = s->min + offset;
+}
+
+int led_set_flash_timeout(struct led_classdev_flash *fled_cdev, u32 timeout)
+{
+	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
+	struct led_flash_setting *s = &fled_cdev->timeout;
+
+	s->val = timeout;
+	led_clamp_align(s);
+
+	if (!(led_cdev->flags & LED_SUSPENDED))
+		return call_flash_op(fled_cdev, timeout_set, s->val);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(led_set_flash_timeout);
+
+int led_get_flash_fault(struct led_classdev_flash *fled_cdev, u32 *fault)
+{
+	return call_flash_op(fled_cdev, fault_get, fault);
+}
+EXPORT_SYMBOL_GPL(led_get_flash_fault);
+
+int led_set_flash_brightness(struct led_classdev_flash *fled_cdev,
+				u32 brightness)
+{
+	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
+	struct led_flash_setting *s = &fled_cdev->brightness;
+
+	s->val = brightness;
+	led_clamp_align(s);
+
+	if (!(led_cdev->flags & LED_SUSPENDED))
+		return call_flash_op(fled_cdev, flash_brightness_set, s->val);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(led_set_flash_brightness);
+
+int led_update_flash_brightness(struct led_classdev_flash *fled_cdev)
+{
+	struct led_flash_setting *s = &fled_cdev->brightness;
+	u32 brightness;
+
+	if (has_flash_op(fled_cdev, flash_brightness_get)) {
+		int ret = call_flash_op(fled_cdev, flash_brightness_get,
+						&brightness);
+		if (ret < 0)
+			return ret;
+
+		s->val = brightness;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(led_update_flash_brightness);
+
+MODULE_AUTHOR("Jacek Anaszewski <[e-mail]>");
+MODULE_DESCRIPTION("LED Flash class interface");
+MODULE_LICENSE("GPL v2");

drivers/leds/led-class.c

···
 void led_classdev_resume(struct led_classdev *led_cdev)
 {
 	led_cdev->brightness_set(led_cdev, led_cdev->brightness);
+
+	if (led_cdev->flash_resume)
+		led_cdev->flash_resume(led_cdev);
+
 	led_cdev->flags &= ~LED_SUSPENDED;
 }
 EXPORT_SYMBOL_GPL(led_classdev_resume);
···
 
 	INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);
 
-	init_timer(&led_cdev->blink_timer);
-	led_cdev->blink_timer.function = led_timer_function;
-	led_cdev->blink_timer.data = (unsigned long)led_cdev;
+	setup_timer(&led_cdev->blink_timer, led_timer_function,
+		    (unsigned long)led_cdev);
 
 #ifdef CONFIG_LEDS_TRIGGERS
 	led_trigger_set_default(led_cdev);

drivers/leds/leds-gpio.c

···
 		led.gpiod = devm_get_gpiod_from_child(dev, child);
 		if (IS_ERR(led.gpiod)) {
 			fwnode_handle_put(child);
+			ret = PTR_ERR(led.gpiod);
 			goto err;
 		}
 
···
 err:
 	for (count = priv->num_leds - 2; count >= 0; count--)
 		delete_gpio_led(&priv->leds[count]);
-	return ERR_PTR(-ENODEV);
+	return ERR_PTR(ret);
 }
 
 static const struct of_device_id of_gpio_leds_match[] = {

drivers/leds/leds-mc13783.c

···
 	if (!pdata)
 		return ERR_PTR(-ENOMEM);
 
-	of_node_get(dev->parent->of_node);
-
-	parent = of_find_node_by_name(dev->parent->of_node, "leds");
+	parent = of_get_child_by_name(dev->parent->of_node, "leds");
 	if (!parent)
 		goto out_node_put;
 

drivers/leds/leds.h

···
 static inline void led_set_brightness_async(struct led_classdev *led_cdev,
 					enum led_brightness value)
 {
-	led_cdev->brightness = min(value, led_cdev->max_brightness);
+	value = min(value, led_cdev->max_brightness);
+	led_cdev->brightness = value;
 
 	if (!(led_cdev->flags & LED_SUSPENDED))
 		led_cdev->brightness_set(led_cdev, value);

include/linux/led-class-flash.h

···
+/*
+ * LED Flash class interface
+ *
+ * Copyright (C) 2015 Samsung Electronics Co., Ltd.
+ * Author: Jacek Anaszewski <[e-mail]>
+ *
+ * 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_FLASH_LEDS_H_INCLUDED
+#define __LINUX_FLASH_LEDS_H_INCLUDED
+
+#include <linux/leds.h>
+#include <uapi/linux/v4l2-controls.h>
+
+struct device_node;
+struct led_classdev_flash;
+
+/*
+ * Supported led fault bits - must be kept in synch
+ * with V4L2_FLASH_FAULT bits.
+ */
+#define LED_FAULT_OVER_VOLTAGE		(1 << 0)
+#define LED_FAULT_TIMEOUT		(1 << 1)
+#define LED_FAULT_OVER_TEMPERATURE	(1 << 2)
+#define LED_FAULT_SHORT_CIRCUIT		(1 << 3)
+#define LED_FAULT_OVER_CURRENT		(1 << 4)
+#define LED_FAULT_INDICATOR		(1 << 5)
+#define LED_FAULT_UNDER_VOLTAGE		(1 << 6)
+#define LED_FAULT_INPUT_VOLTAGE		(1 << 7)
+#define LED_FAULT_LED_OVER_TEMPERATURE	(1 << 8)
+#define LED_NUM_FLASH_FAULTS		9
+
+#define LED_FLASH_MAX_SYSFS_GROUPS 7
+
+struct led_flash_ops {
+	/* set flash brightness */
+	int (*flash_brightness_set)(struct led_classdev_flash *fled_cdev,
+					u32 brightness);
+	/* get flash brightness */
+	int (*flash_brightness_get)(struct led_classdev_flash *fled_cdev,
+					u32 *brightness);
+	/* set flash strobe state */
+	int (*strobe_set)(struct led_classdev_flash *fled_cdev, bool state);
+	/* get flash strobe state */
+	int (*strobe_get)(struct led_classdev_flash *fled_cdev, bool *state);
+	/* set flash timeout */
+	int (*timeout_set)(struct led_classdev_flash *fled_cdev, u32 timeout);
+	/* get the flash LED fault */
+	int (*fault_get)(struct led_classdev_flash *fled_cdev, u32 *fault);
+};
+
+/*
+ * Current value of a flash setting along
+ * with its constraints.
+ */
+struct led_flash_setting {
+	/* maximum allowed value */
+	u32 min;
+	/* maximum allowed value */
+	u32 max;
+	/* step value */
+	u32 step;
+	/* current value */
+	u32 val;
+};
+
+struct led_classdev_flash {
+	/* led class device */
+	struct led_classdev led_cdev;
+
+	/* flash led specific ops */
+	const struct led_flash_ops *ops;
+
+	/* flash brightness value in microamperes along with its constraints */
+	struct led_flash_setting brightness;
+
+	/* flash timeout value in microseconds along with its constraints */
+	struct led_flash_setting timeout;
+
+	/* LED Flash class sysfs groups */
+	const struct attribute_group *sysfs_groups[LED_FLASH_MAX_SYSFS_GROUPS];
+
+	/* LEDs available for flash strobe synchronization */
+	struct led_classdev_flash **sync_leds;
+
+	/* Number of LEDs available for flash strobe synchronization */
+	int num_sync_leds;
+
+	/*
+	 * The identifier of the sub-led to synchronize the flash strobe with.
+	 * Identifiers start from 1, which reflects the first element from the
+	 * sync_leds array. 0 means that the flash strobe should not be
+	 * synchronized.
+	 */
+	u32 sync_led_id;
+};
+
+static inline struct led_classdev_flash *lcdev_to_flcdev(
+						struct led_classdev *lcdev)
+{
+	return container_of(lcdev, struct led_classdev_flash, led_cdev);
+}
+
+/**
+ * led_classdev_flash_register - register a new object of led_classdev class
+ *				 with support for flash LEDs
+ * @parent: the flash LED to register
+ * @fled_cdev: the led_classdev_flash structure for this device
+ *
+ * Returns: 0 on success or negative error value on failure
+ */
+extern int led_classdev_flash_register(struct device *parent,
+				struct led_classdev_flash *fled_cdev);
+
+/**
+ * led_classdev_flash_unregister - unregisters an object of led_classdev class
+ *				   with support for flash LEDs
+ * @fled_cdev: the flash LED to unregister
+ *
+ * Unregister a previously registered via led_classdev_flash_register object
+ */
+extern void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev);
+
+/**
+ * led_set_flash_strobe - setup flash strobe
+ * @fled_cdev: the flash LED to set strobe on
+ * @state: 1 - strobe flash, 0 - stop flash strobe
+ *
+ * Strobe the flash LED.
+ *
+ * Returns: 0 on success or negative error value on failure
+ */
+static inline int led_set_flash_strobe(struct led_classdev_flash *fled_cdev,
+					bool state)
+{
+	return fled_cdev->ops->strobe_set(fled_cdev, state);
+}
+
+/**
+ * led_get_flash_strobe - get flash strobe status
+ * @fled_cdev: the flash LED to query
+ * @state: 1 - flash is strobing, 0 - flash is off
+ *
+ * Check whether the flash is strobing at the moment.
+ *
+ * Returns: 0 on success or negative error value on failure
+ */
+static inline int led_get_flash_strobe(struct led_classdev_flash *fled_cdev,
+					bool *state)
+{
+	if (fled_cdev->ops->strobe_get)
+		return fled_cdev->ops->strobe_get(fled_cdev, state);
+
+	return -EINVAL;
+}
+
+/**
+ * led_set_flash_brightness - set flash LED brightness
+ * @fled_cdev: the flash LED to set
+ * @brightness: the brightness to set it to
+ *
+ * Set a flash LED's brightness.
+ *
+ * Returns: 0 on success or negative error value on failure
+ */
+extern int led_set_flash_brightness(struct led_classdev_flash *fled_cdev,
+					u32 brightness);
+
+/**
+ * led_update_flash_brightness - update flash LED brightness
+ * @fled_cdev: the flash LED to query
+ *
+ * Get a flash LED's current brightness and update led_flash->brightness
+ * member with the obtained value.
+ *
+ * Returns: 0 on success or negative error value on failure
+ */
+extern int led_update_flash_brightness(struct led_classdev_flash *fled_cdev);
+
+/**
+ * led_set_flash_timeout - set flash LED timeout
+ * @fled_cdev: the flash LED to set
+ * @timeout: the flash timeout to set it to
+ *
+ * Set the flash strobe duration.
+ *
+ * Returns: 0 on success or negative error value on failure
+ */
+extern int led_set_flash_timeout(struct led_classdev_flash *fled_cdev,
+					u32 timeout);
+
+/**
+ * led_get_flash_fault - get the flash LED fault
+ * @fled_cdev: the flash LED to query
+ * @fault: bitmask containing flash faults
+ *
+ * Get the flash LED fault.
+ *
+ * Returns: 0 on success or negative error value on failure
+ */
+extern int led_get_flash_fault(struct led_classdev_flash *fled_cdev,
+					u32 *fault);
+
+#endif	/* __LINUX_FLASH_LEDS_H_INCLUDED */

include/linux/leds.h

···
 #define LED_SYSFS_DISABLE	(1 << 20)
 #define SET_BRIGHTNESS_ASYNC	(1 << 21)
 #define SET_BRIGHTNESS_SYNC	(1 << 22)
+#define LED_DEV_CAP_FLASH	(1 << 23)
+#define LED_DEV_CAP_SYNC_STROBE	(1 << 24)
 
 	/* Set LED brightness level */
 	/* Must not sleep, use a workqueue if needed */
···
 	unsigned long		 blink_delay_on, blink_delay_off;
 	struct timer_list	 blink_timer;
 	int			 blink_brightness;
+	void			(*flash_resume)(struct led_classdev *led_cdev);
 
 	struct work_struct	set_brightness_work;
 	int			delayed_set_value;