Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

19 files changed, 3138 insertions, 0 deletions

diff --git a/drivers/leds/trigger/Kconfig b/drivers/leds/trigger/Kconfig
new file mode 100644
index 000000000..dc6816d36
--- /dev/null
+++ b/drivers/leds/trigger/Kconfig
@@ -0,0 +1,157 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menuconfig LEDS_TRIGGERS
+	bool "LED Trigger support"
+	depends on LEDS_CLASS
+	help
+	  This option enables trigger support for the leds class.
+	  These triggers allow kernel events to drive the LEDs and can
+	  be configured via sysfs. If unsure, say Y.
+
+if LEDS_TRIGGERS
+
+config LEDS_TRIGGER_TIMER
+	tristate "LED Timer Trigger"
+	help
+	  This allows LEDs to be controlled by a programmable timer
+	  via sysfs. Some LED hardware can be programmed to start
+	  blinking the LED without any further software interaction.
+	  For more details read Documentation/leds/leds-class.rst.
+
+	  If unsure, say Y.
+
+config LEDS_TRIGGER_ONESHOT
+	tristate "LED One-shot Trigger"
+	help
+	  This allows LEDs to blink in one-shot pulses with parameters
+	  controlled via sysfs.  It's useful to notify the user on
+	  sporadic events, when there are no clear begin and end trap points,
+	  or on dense events, where this blinks the LED at constant rate if
+	  rearmed continuously.
+
+	  It also shows how to use the led_blink_set_oneshot() function.
+
+	  If unsure, say Y.
+
+config LEDS_TRIGGER_DISK
+	bool "LED Disk Trigger"
+	depends on ATA
+	help
+	  This allows LEDs to be controlled by disk activity.
+	  If unsure, say Y.
+
+config LEDS_TRIGGER_MTD
+	bool "LED MTD (NAND/NOR) Trigger"
+	depends on MTD
+	help
+	  This allows LEDs to be controlled by MTD activity.
+	  If unsure, say N.
+
+config LEDS_TRIGGER_HEARTBEAT
+	tristate "LED Heartbeat Trigger"
+	help
+	  This allows LEDs to be controlled by a CPU load average.
+	  The flash frequency is a hyperbolic function of the 1-minute
+	  load average.
+	  If unsure, say Y.
+
+config LEDS_TRIGGER_BACKLIGHT
+	tristate "LED backlight Trigger"
+	help
+	  This allows LEDs to be controlled as a backlight device: they
+	  turn off and on when the display is blanked and unblanked.
+
+	  If unsure, say N.
+
+config LEDS_TRIGGER_CPU
+	bool "LED CPU Trigger"
+	depends on !PREEMPT_RT
+	help
+	  This allows LEDs to be controlled by active CPUs. This shows
+	  the active CPUs across an array of LEDs so you can see which
+	  CPUs are active on the system at any given moment.
+
+	  If unsure, say N.
+
+config LEDS_TRIGGER_ACTIVITY
+	tristate "LED activity Trigger"
+	help
+	  This allows LEDs to be controlled by an immediate CPU usage.
+	  The flash frequency and duty cycle varies from faint flashes to
+	  intense brightness depending on the instant CPU load.
+	  If unsure, say N.
+
+config LEDS_TRIGGER_GPIO
+	tristate "LED GPIO Trigger"
+	depends on GPIOLIB || COMPILE_TEST
+	help
+	  This allows LEDs to be controlled by gpio events. It's good
+	  when using gpios as switches and triggering the needed LEDs
+	  from there. One use case is n810's keypad LEDs that could
+	  be triggered by this trigger when user slides up to show
+	  keypad.
+
+	  If unsure, say N.
+
+config LEDS_TRIGGER_DEFAULT_ON
+	tristate "LED Default ON Trigger"
+	help
+	  This allows LEDs to be initialised in the ON state.
+	  If unsure, say Y.
+
+comment "iptables trigger is under Netfilter config (LED target)"
+	depends on LEDS_TRIGGERS
+
+config LEDS_TRIGGER_TRANSIENT
+	tristate "LED Transient Trigger"
+	help
+	  This allows one time activation of a transient state on
+	  GPIO/PWM based hardware.
+	  If unsure, say Y.
+
+config LEDS_TRIGGER_CAMERA
+	tristate "LED Camera Flash/Torch Trigger"
+	help
+	  This allows LEDs to be controlled as a camera flash/torch device.
+	  This enables direct flash/torch on/off by the driver, kernel space.
+	  If unsure, say Y.
+
+config LEDS_TRIGGER_PANIC
+	bool "LED Panic Trigger"
+	help
+	  This allows LEDs to be configured to blink on a kernel panic.
+	  Enabling this option will allow to mark certain LEDs as panic indicators,
+	  allowing to blink them on a kernel panic, even if they are set to
+	  a different trigger.
+	  If unsure, say Y.
+
+config LEDS_TRIGGER_NETDEV
+	tristate "LED Netdev Trigger"
+	depends on NET
+	help
+	  This allows LEDs to be controlled by network device activity.
+	  If unsure, say Y.
+
+config LEDS_TRIGGER_PATTERN
+	tristate "LED Pattern Trigger"
+	help
+	  This allows LEDs to be controlled by a software or hardware pattern
+	  which is a series of tuples, of brightness and duration (ms).
+	  If unsure, say N
+
+config LEDS_TRIGGER_AUDIO
+	tristate "Audio Mute LED Trigger"
+	help
+	  This allows LEDs to be controlled by audio drivers for following
+	  the audio mute and mic-mute changes.
+	  If unsure, say N
+
+config LEDS_TRIGGER_TTY
+	tristate "LED Trigger for TTY devices"
+	depends on TTY
+	help
+	  This allows LEDs to be controlled by activity on ttys which includes
+	  serial devices like /dev/ttyS0.
+
+	  When build as a module this driver will be called ledtrig-tty.
+
+endif # LEDS_TRIGGERS
diff --git a/drivers/leds/trigger/Makefile b/drivers/leds/trigger/Makefile
new file mode 100644
index 000000000..25c4db97c
--- /dev/null
+++ b/drivers/leds/trigger/Makefile
@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_LEDS_TRIGGER_TIMER)	+= ledtrig-timer.o
+obj-$(CONFIG_LEDS_TRIGGER_ONESHOT)	+= ledtrig-oneshot.o
+obj-$(CONFIG_LEDS_TRIGGER_DISK)		+= ledtrig-disk.o
+obj-$(CONFIG_LEDS_TRIGGER_MTD)		+= ledtrig-mtd.o
+obj-$(CONFIG_LEDS_TRIGGER_HEARTBEAT)	+= ledtrig-heartbeat.o
+obj-$(CONFIG_LEDS_TRIGGER_BACKLIGHT)	+= ledtrig-backlight.o
+obj-$(CONFIG_LEDS_TRIGGER_GPIO)		+= ledtrig-gpio.o
+obj-$(CONFIG_LEDS_TRIGGER_CPU)		+= ledtrig-cpu.o
+obj-$(CONFIG_LEDS_TRIGGER_ACTIVITY)	+= ledtrig-activity.o
+obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON)	+= ledtrig-default-on.o
+obj-$(CONFIG_LEDS_TRIGGER_TRANSIENT)	+= ledtrig-transient.o
+obj-$(CONFIG_LEDS_TRIGGER_CAMERA)	+= ledtrig-camera.o
+obj-$(CONFIG_LEDS_TRIGGER_PANIC)	+= ledtrig-panic.o
+obj-$(CONFIG_LEDS_TRIGGER_NETDEV)	+= ledtrig-netdev.o
+obj-$(CONFIG_LEDS_TRIGGER_PATTERN)	+= ledtrig-pattern.o
+obj-$(CONFIG_LEDS_TRIGGER_AUDIO)	+= ledtrig-audio.o
+obj-$(CONFIG_LEDS_TRIGGER_TTY)		+= ledtrig-tty.o
diff --git a/drivers/leds/trigger/ledtrig-activity.c b/drivers/leds/trigger/ledtrig-activity.c
new file mode 100644
index 000000000..30bc9df03
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-activity.c
@@ -0,0 +1,270 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Activity LED trigger
+ *
+ * Copyright (C) 2017 Willy Tarreau <w@1wt.eu>
+ * Partially based on Atsushi Nemoto's ledtrig-heartbeat.c.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/kernel_stat.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/panic_notifier.h>
+#include <linux/reboot.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+#include "../leds.h"
+
+static int panic_detected;
+
+struct activity_data {
+	struct timer_list timer;
+	struct led_classdev *led_cdev;
+	u64 last_used;
+	u64 last_boot;
+	int time_left;
+	int state;
+	int invert;
+};
+
+static void led_activity_function(struct timer_list *t)
+{
+	struct activity_data *activity_data = from_timer(activity_data, t,
+							 timer);
+	struct led_classdev *led_cdev = activity_data->led_cdev;
+	unsigned int target;
+	unsigned int usage;
+	int delay;
+	u64 curr_used;
+	u64 curr_boot;
+	s32 diff_used;
+	s32 diff_boot;
+	int cpus;
+	int i;
+
+	if (test_and_clear_bit(LED_BLINK_BRIGHTNESS_CHANGE, &led_cdev->work_flags))
+		led_cdev->blink_brightness = led_cdev->new_blink_brightness;
+
+	if (unlikely(panic_detected)) {
+		/* full brightness in case of panic */
+		led_set_brightness_nosleep(led_cdev, led_cdev->blink_brightness);
+		return;
+	}
+
+	cpus = 0;
+	curr_used = 0;
+
+	for_each_possible_cpu(i) {
+		struct kernel_cpustat kcpustat;
+
+		kcpustat_cpu_fetch(&kcpustat, i);
+
+		curr_used += kcpustat.cpustat[CPUTIME_USER]
+			  +  kcpustat.cpustat[CPUTIME_NICE]
+			  +  kcpustat.cpustat[CPUTIME_SYSTEM]
+			  +  kcpustat.cpustat[CPUTIME_SOFTIRQ]
+			  +  kcpustat.cpustat[CPUTIME_IRQ];
+		cpus++;
+	}
+
+	/* We come here every 100ms in the worst case, so that's 100M ns of
+	 * cumulated time. By dividing by 2^16, we get the time resolution
+	 * down to 16us, ensuring we won't overflow 32-bit computations below
+	 * even up to 3k CPUs, while keeping divides cheap on smaller systems.
+	 */
+	curr_boot = ktime_get_boottime_ns() * cpus;
+	diff_boot = (curr_boot - activity_data->last_boot) >> 16;
+	diff_used = (curr_used - activity_data->last_used) >> 16;
+	activity_data->last_boot = curr_boot;
+	activity_data->last_used = curr_used;
+
+	if (diff_boot <= 0 || diff_used < 0)
+		usage = 0;
+	else if (diff_used >= diff_boot)
+		usage = 100;
+	else
+		usage = 100 * diff_used / diff_boot;
+
+	/*
+	 * Now we know the total boot_time multiplied by the number of CPUs, and
+	 * the total idle+wait time for all CPUs. We'll compare how they evolved
+	 * since last call. The % of overall CPU usage is :
+	 *
+	 *      1 - delta_idle / delta_boot
+	 *
+	 * What we want is that when the CPU usage is zero, the LED must blink
+	 * slowly with very faint flashes that are detectable but not disturbing
+	 * (typically 10ms every second, or 10ms ON, 990ms OFF). Then we want
+	 * blinking frequency to increase up to the point where the load is
+	 * enough to saturate one core in multi-core systems or 50% in single
+	 * core systems. At this point it should reach 10 Hz with a 10/90 duty
+	 * cycle (10ms ON, 90ms OFF). After this point, the blinking frequency
+	 * remains stable (10 Hz) and only the duty cycle increases to report
+	 * the activity, up to the point where we have 90ms ON, 10ms OFF when
+	 * all cores are saturated. It's important that the LED never stays in
+	 * a steady state so that it's easy to distinguish an idle or saturated
+	 * machine from a hung one.
+	 *
+	 * This gives us :
+	 *   - a target CPU usage of min(50%, 100%/#CPU) for a 10% duty cycle
+	 *     (10ms ON, 90ms OFF)
+	 *   - below target :
+	 *      ON_ms  = 10
+	 *      OFF_ms = 90 + (1 - usage/target) * 900
+	 *   - above target :
+	 *      ON_ms  = 10 + (usage-target)/(100%-target) * 80
+	 *      OFF_ms = 90 - (usage-target)/(100%-target) * 80
+	 *
+	 * In order to keep a good responsiveness, we cap the sleep time to
+	 * 100 ms and keep track of the sleep time left. This allows us to
+	 * quickly change it if needed.
+	 */
+
+	activity_data->time_left -= 100;
+	if (activity_data->time_left <= 0) {
+		activity_data->time_left = 0;
+		activity_data->state = !activity_data->state;
+		led_set_brightness_nosleep(led_cdev,
+			(activity_data->state ^ activity_data->invert) ?
+			led_cdev->blink_brightness : LED_OFF);
+	}
+
+	target = (cpus > 1) ? (100 / cpus) : 50;
+
+	if (usage < target)
+		delay = activity_data->state ?
+			10 :                        /* ON  */
+			990 - 900 * usage / target; /* OFF */
+	else
+		delay = activity_data->state ?
+			10 + 80 * (usage - target) / (100 - target) : /* ON  */
+			90 - 80 * (usage - target) / (100 - target);  /* OFF */
+
+
+	if (!activity_data->time_left || delay <= activity_data->time_left)
+		activity_data->time_left = delay;
+
+	delay = min_t(int, activity_data->time_left, 100);
+	mod_timer(&activity_data->timer, jiffies + msecs_to_jiffies(delay));
+}
+
+static ssize_t led_invert_show(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+	struct activity_data *activity_data = led_trigger_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", activity_data->invert);
+}
+
+static ssize_t led_invert_store(struct device *dev,
+                                struct device_attribute *attr,
+                                const char *buf, size_t size)
+{
+	struct activity_data *activity_data = led_trigger_get_drvdata(dev);
+	unsigned long state;
+	int ret;
+
+	ret = kstrtoul(buf, 0, &state);
+	if (ret)
+		return ret;
+
+	activity_data->invert = !!state;
+
+	return size;
+}
+
+static DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store);
+
+static struct attribute *activity_led_attrs[] = {
+	&dev_attr_invert.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(activity_led);
+
+static int activity_activate(struct led_classdev *led_cdev)
+{
+	struct activity_data *activity_data;
+
+	activity_data = kzalloc(sizeof(*activity_data), GFP_KERNEL);
+	if (!activity_data)
+		return -ENOMEM;
+
+	led_set_trigger_data(led_cdev, activity_data);
+
+	activity_data->led_cdev = led_cdev;
+	timer_setup(&activity_data->timer, led_activity_function, 0);
+	if (!led_cdev->blink_brightness)
+		led_cdev->blink_brightness = led_cdev->max_brightness;
+	led_activity_function(&activity_data->timer);
+	set_bit(LED_BLINK_SW, &led_cdev->work_flags);
+
+	return 0;
+}
+
+static void activity_deactivate(struct led_classdev *led_cdev)
+{
+	struct activity_data *activity_data = led_get_trigger_data(led_cdev);
+
+	del_timer_sync(&activity_data->timer);
+	kfree(activity_data);
+	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
+}
+
+static struct led_trigger activity_led_trigger = {
+	.name       = "activity",
+	.activate   = activity_activate,
+	.deactivate = activity_deactivate,
+	.groups     = activity_led_groups,
+};
+
+static int activity_reboot_notifier(struct notifier_block *nb,
+                                    unsigned long code, void *unused)
+{
+	led_trigger_unregister(&activity_led_trigger);
+	return NOTIFY_DONE;
+}
+
+static int activity_panic_notifier(struct notifier_block *nb,
+                                   unsigned long code, void *unused)
+{
+	panic_detected = 1;
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block activity_reboot_nb = {
+	.notifier_call = activity_reboot_notifier,
+};
+
+static struct notifier_block activity_panic_nb = {
+	.notifier_call = activity_panic_notifier,
+};
+
+static int __init activity_init(void)
+{
+	int rc = led_trigger_register(&activity_led_trigger);
+
+	if (!rc) {
+		atomic_notifier_chain_register(&panic_notifier_list,
+					       &activity_panic_nb);
+		register_reboot_notifier(&activity_reboot_nb);
+	}
+	return rc;
+}
+
+static void __exit activity_exit(void)
+{
+	unregister_reboot_notifier(&activity_reboot_nb);
+	atomic_notifier_chain_unregister(&panic_notifier_list,
+					 &activity_panic_nb);
+	led_trigger_unregister(&activity_led_trigger);
+}
+
+module_init(activity_init);
+module_exit(activity_exit);
+
+MODULE_AUTHOR("Willy Tarreau <w@1wt.eu>");
+MODULE_DESCRIPTION("Activity LED trigger");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/leds/trigger/ledtrig-audio.c b/drivers/leds/trigger/ledtrig-audio.c
new file mode 100644
index 000000000..c6b437e63
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-audio.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Audio Mute LED trigger
+//
+
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include "../leds.h"
+
+static enum led_brightness audio_state[NUM_AUDIO_LEDS];
+
+static int ledtrig_audio_mute_activate(struct led_classdev *led_cdev)
+{
+	led_set_brightness_nosleep(led_cdev, audio_state[LED_AUDIO_MUTE]);
+	return 0;
+}
+
+static int ledtrig_audio_micmute_activate(struct led_classdev *led_cdev)
+{
+	led_set_brightness_nosleep(led_cdev, audio_state[LED_AUDIO_MICMUTE]);
+	return 0;
+}
+
+static struct led_trigger ledtrig_audio[NUM_AUDIO_LEDS] = {
+	[LED_AUDIO_MUTE] = {
+		.name     = "audio-mute",
+		.activate = ledtrig_audio_mute_activate,
+	},
+	[LED_AUDIO_MICMUTE] = {
+		.name     = "audio-micmute",
+		.activate = ledtrig_audio_micmute_activate,
+	},
+};
+
+enum led_brightness ledtrig_audio_get(enum led_audio type)
+{
+	return audio_state[type];
+}
+EXPORT_SYMBOL_GPL(ledtrig_audio_get);
+
+void ledtrig_audio_set(enum led_audio type, enum led_brightness state)
+{
+	audio_state[type] = state;
+	led_trigger_event(&ledtrig_audio[type], state);
+}
+EXPORT_SYMBOL_GPL(ledtrig_audio_set);
+
+static int __init ledtrig_audio_init(void)
+{
+	led_trigger_register(&ledtrig_audio[LED_AUDIO_MUTE]);
+	led_trigger_register(&ledtrig_audio[LED_AUDIO_MICMUTE]);
+	return 0;
+}
+module_init(ledtrig_audio_init);
+
+static void __exit ledtrig_audio_exit(void)
+{
+	led_trigger_unregister(&ledtrig_audio[LED_AUDIO_MUTE]);
+	led_trigger_unregister(&ledtrig_audio[LED_AUDIO_MICMUTE]);
+}
+module_exit(ledtrig_audio_exit);
+
+MODULE_DESCRIPTION("LED trigger for audio mute control");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/leds/trigger/ledtrig-backlight.c b/drivers/leds/trigger/ledtrig-backlight.c
new file mode 100644
index 000000000..487577d22
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-backlight.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Backlight emulation LED trigger
+ *
+ * Copyright 2008 (C) Rodolfo Giometti <giometti@linux.it>
+ * Copyright 2008 (C) Eurotech S.p.A. <info@eurotech.it>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/fb.h>
+#include <linux/leds.h>
+#include "../leds.h"
+
+#define BLANK		1
+#define UNBLANK		0
+
+struct bl_trig_notifier {
+	struct led_classdev *led;
+	int brightness;
+	int old_status;
+	struct notifier_block notifier;
+	unsigned invert;
+};
+
+static int fb_notifier_callback(struct notifier_block *p,
+				unsigned long event, void *data)
+{
+	struct bl_trig_notifier *n = container_of(p,
+					struct bl_trig_notifier, notifier);
+	struct led_classdev *led = n->led;
+	struct fb_event *fb_event = data;
+	int *blank;
+	int new_status;
+
+	/* If we aren't interested in this event, skip it immediately ... */
+	if (event != FB_EVENT_BLANK)
+		return 0;
+
+	blank = fb_event->data;
+	new_status = *blank ? BLANK : UNBLANK;
+
+	if (new_status == n->old_status)
+		return 0;
+
+	if ((n->old_status == UNBLANK) ^ n->invert) {
+		n->brightness = led->brightness;
+		led_set_brightness_nosleep(led, LED_OFF);
+	} else {
+		led_set_brightness_nosleep(led, n->brightness);
+	}
+
+	n->old_status = new_status;
+
+	return 0;
+}
+
+static ssize_t bl_trig_invert_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct bl_trig_notifier *n = led_trigger_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", n->invert);
+}
+
+static ssize_t bl_trig_invert_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t num)
+{
+	struct led_classdev *led = led_trigger_get_led(dev);
+	struct bl_trig_notifier *n = led_trigger_get_drvdata(dev);
+	unsigned long invert;
+	int ret;
+
+	ret = kstrtoul(buf, 10, &invert);
+	if (ret < 0)
+		return ret;
+
+	if (invert > 1)
+		return -EINVAL;
+
+	n->invert = invert;
+
+	/* After inverting, we need to update the LED. */
+	if ((n->old_status == BLANK) ^ n->invert)
+		led_set_brightness_nosleep(led, LED_OFF);
+	else
+		led_set_brightness_nosleep(led, n->brightness);
+
+	return num;
+}
+static DEVICE_ATTR(inverted, 0644, bl_trig_invert_show, bl_trig_invert_store);
+
+static struct attribute *bl_trig_attrs[] = {
+	&dev_attr_inverted.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(bl_trig);
+
+static int bl_trig_activate(struct led_classdev *led)
+{
+	int ret;
+
+	struct bl_trig_notifier *n;
+
+	n = kzalloc(sizeof(struct bl_trig_notifier), GFP_KERNEL);
+	if (!n)
+		return -ENOMEM;
+	led_set_trigger_data(led, n);
+
+	n->led = led;
+	n->brightness = led->brightness;
+	n->old_status = UNBLANK;
+	n->notifier.notifier_call = fb_notifier_callback;
+
+	ret = fb_register_client(&n->notifier);
+	if (ret)
+		dev_err(led->dev, "unable to register backlight trigger\n");
+
+	return 0;
+}
+
+static void bl_trig_deactivate(struct led_classdev *led)
+{
+	struct bl_trig_notifier *n = led_get_trigger_data(led);
+
+	fb_unregister_client(&n->notifier);
+	kfree(n);
+}
+
+static struct led_trigger bl_led_trigger = {
+	.name		= "backlight",
+	.activate	= bl_trig_activate,
+	.deactivate	= bl_trig_deactivate,
+	.groups		= bl_trig_groups,
+};
+module_led_trigger(bl_led_trigger);
+
+MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
+MODULE_DESCRIPTION("Backlight emulation LED trigger");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/leds/trigger/ledtrig-camera.c b/drivers/leds/trigger/ledtrig-camera.c
new file mode 100644
index 000000000..ab1c41087
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-camera.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Camera Flash and Torch On/Off Trigger
+ *
+ * based on ledtrig-ide-disk.c
+ *
+ * Copyright 2013 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/leds.h>
+
+DEFINE_LED_TRIGGER(ledtrig_flash);
+DEFINE_LED_TRIGGER(ledtrig_torch);
+
+void ledtrig_flash_ctrl(bool on)
+{
+	enum led_brightness brt = on ? LED_FULL : LED_OFF;
+
+	led_trigger_event(ledtrig_flash, brt);
+}
+EXPORT_SYMBOL_GPL(ledtrig_flash_ctrl);
+
+void ledtrig_torch_ctrl(bool on)
+{
+	enum led_brightness brt = on ? LED_FULL : LED_OFF;
+
+	led_trigger_event(ledtrig_torch, brt);
+}
+EXPORT_SYMBOL_GPL(ledtrig_torch_ctrl);
+
+static int __init ledtrig_camera_init(void)
+{
+	led_trigger_register_simple("flash", &ledtrig_flash);
+	led_trigger_register_simple("torch", &ledtrig_torch);
+	return 0;
+}
+module_init(ledtrig_camera_init);
+
+static void __exit ledtrig_camera_exit(void)
+{
+	led_trigger_unregister_simple(ledtrig_torch);
+	led_trigger_unregister_simple(ledtrig_flash);
+}
+module_exit(ledtrig_camera_exit);
+
+MODULE_DESCRIPTION("LED Trigger for Camera Flash/Torch Control");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/leds/trigger/ledtrig-cpu.c b/drivers/leds/trigger/ledtrig-cpu.c
new file mode 100644
index 000000000..05848a2fe
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-cpu.c
@@ -0,0 +1,172 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ledtrig-cpu.c - LED trigger based on CPU activity
+ *
+ * This LED trigger will be registered for first 8 CPUs and named
+ * as cpu0..cpu7. There's additional trigger called cpu that
+ * is on when any CPU is active.
+ *
+ * If you want support for arbitrary number of CPUs, make it one trigger,
+ * with additional sysfs file selecting which CPU to watch.
+ *
+ * It can be bound to any LED just like other triggers using either a
+ * board file or via sysfs interface.
+ *
+ * An API named ledtrig_cpu is exported for any user, who want to add CPU
+ * activity indication in their code.
+ *
+ * Copyright 2011 Linus Walleij <linus.walleij@linaro.org>
+ * Copyright 2011 - 2012 Bryan Wu <bryan.wu@canonical.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/percpu.h>
+#include <linux/syscore_ops.h>
+#include <linux/rwsem.h>
+#include <linux/cpu.h>
+#include "../leds.h"
+
+#define MAX_NAME_LEN	8
+
+struct led_trigger_cpu {
+	bool is_active;
+	char name[MAX_NAME_LEN];
+	struct led_trigger *_trig;
+};
+
+static DEFINE_PER_CPU(struct led_trigger_cpu, cpu_trig);
+
+static struct led_trigger *trig_cpu_all;
+static atomic_t num_active_cpus = ATOMIC_INIT(0);
+
+/**
+ * ledtrig_cpu - emit a CPU event as a trigger
+ * @ledevt: CPU event to be emitted
+ *
+ * Emit a CPU event on a CPU core, which will trigger a
+ * bound LED to turn on or turn off.
+ */
+void ledtrig_cpu(enum cpu_led_event ledevt)
+{
+	struct led_trigger_cpu *trig = this_cpu_ptr(&cpu_trig);
+	bool is_active = trig->is_active;
+
+	/* Locate the correct CPU LED */
+	switch (ledevt) {
+	case CPU_LED_IDLE_END:
+	case CPU_LED_START:
+		/* Will turn the LED on, max brightness */
+		is_active = true;
+		break;
+
+	case CPU_LED_IDLE_START:
+	case CPU_LED_STOP:
+	case CPU_LED_HALTED:
+		/* Will turn the LED off */
+		is_active = false;
+		break;
+
+	default:
+		/* Will leave the LED as it is */
+		break;
+	}
+
+	if (is_active != trig->is_active) {
+		unsigned int active_cpus;
+		unsigned int total_cpus;
+
+		/* Update trigger state */
+		trig->is_active = is_active;
+		atomic_add(is_active ? 1 : -1, &num_active_cpus);
+		active_cpus = atomic_read(&num_active_cpus);
+		total_cpus = num_present_cpus();
+
+		led_trigger_event(trig->_trig,
+			is_active ? LED_FULL : LED_OFF);
+
+
+		led_trigger_event(trig_cpu_all,
+			DIV_ROUND_UP(LED_FULL * active_cpus, total_cpus));
+
+	}
+}
+EXPORT_SYMBOL(ledtrig_cpu);
+
+static int ledtrig_cpu_syscore_suspend(void)
+{
+	ledtrig_cpu(CPU_LED_STOP);
+	return 0;
+}
+
+static void ledtrig_cpu_syscore_resume(void)
+{
+	ledtrig_cpu(CPU_LED_START);
+}
+
+static void ledtrig_cpu_syscore_shutdown(void)
+{
+	ledtrig_cpu(CPU_LED_HALTED);
+}
+
+static struct syscore_ops ledtrig_cpu_syscore_ops = {
+	.shutdown	= ledtrig_cpu_syscore_shutdown,
+	.suspend	= ledtrig_cpu_syscore_suspend,
+	.resume		= ledtrig_cpu_syscore_resume,
+};
+
+static int ledtrig_online_cpu(unsigned int cpu)
+{
+	ledtrig_cpu(CPU_LED_START);
+	return 0;
+}
+
+static int ledtrig_prepare_down_cpu(unsigned int cpu)
+{
+	ledtrig_cpu(CPU_LED_STOP);
+	return 0;
+}
+
+static int __init ledtrig_cpu_init(void)
+{
+	unsigned int cpu;
+	int ret;
+
+	/* Supports up to 9999 cpu cores */
+	BUILD_BUG_ON(CONFIG_NR_CPUS > 9999);
+
+	/*
+	 * Registering a trigger for all CPUs.
+	 */
+	led_trigger_register_simple("cpu", &trig_cpu_all);
+
+	/*
+	 * Registering CPU led trigger for each CPU core here
+	 * ignores CPU hotplug, but after this CPU hotplug works
+	 * fine with this trigger.
+	 */
+	for_each_possible_cpu(cpu) {
+		struct led_trigger_cpu *trig = &per_cpu(cpu_trig, cpu);
+
+		if (cpu >= 8)
+			continue;
+
+		snprintf(trig->name, MAX_NAME_LEN, "cpu%u", cpu);
+
+		led_trigger_register_simple(trig->name, &trig->_trig);
+	}
+
+	register_syscore_ops(&ledtrig_cpu_syscore_ops);
+
+	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "leds/trigger:starting",
+				ledtrig_online_cpu, ledtrig_prepare_down_cpu);
+	if (ret < 0)
+		pr_err("CPU hotplug notifier for ledtrig-cpu could not be registered: %d\n",
+		       ret);
+
+	pr_info("ledtrig-cpu: registered to indicate activity on CPUs\n");
+
+	return 0;
+}
+device_initcall(ledtrig_cpu_init);
diff --git a/drivers/leds/trigger/ledtrig-default-on.c b/drivers/leds/trigger/ledtrig-default-on.c
new file mode 100644
index 000000000..8207f85ec
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-default-on.c
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * LED Kernel Default ON Trigger
+ *
+ * Copyright 2008 Nick Forbes <nick.forbes@incepta.com>
+ *
+ * Based on Richard Purdie's ledtrig-timer.c.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/leds.h>
+#include "../leds.h"
+
+static int defon_trig_activate(struct led_classdev *led_cdev)
+{
+	led_set_brightness_nosleep(led_cdev, led_cdev->max_brightness);
+	return 0;
+}
+
+static struct led_trigger defon_led_trigger = {
+	.name     = "default-on",
+	.activate = defon_trig_activate,
+};
+module_led_trigger(defon_led_trigger);
+
+MODULE_AUTHOR("Nick Forbes <nick.forbes@incepta.com>");
+MODULE_DESCRIPTION("Default-ON LED trigger");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/leds/trigger/ledtrig-disk.c b/drivers/leds/trigger/ledtrig-disk.c
new file mode 100644
index 000000000..074191078
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-disk.c
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * LED Disk Activity Trigger
+ *
+ * Copyright 2006 Openedhand Ltd.
+ *
+ * Author: Richard Purdie <rpurdie@openedhand.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/leds.h>
+
+#define BLINK_DELAY 30
+
+DEFINE_LED_TRIGGER(ledtrig_disk);
+DEFINE_LED_TRIGGER(ledtrig_disk_read);
+DEFINE_LED_TRIGGER(ledtrig_disk_write);
+DEFINE_LED_TRIGGER(ledtrig_ide);
+
+void ledtrig_disk_activity(bool write)
+{
+	unsigned long blink_delay = BLINK_DELAY;
+
+	led_trigger_blink_oneshot(ledtrig_disk,
+				  &blink_delay, &blink_delay, 0);
+	led_trigger_blink_oneshot(ledtrig_ide,
+				  &blink_delay, &blink_delay, 0);
+	if (write)
+		led_trigger_blink_oneshot(ledtrig_disk_write,
+					  &blink_delay, &blink_delay, 0);
+	else
+		led_trigger_blink_oneshot(ledtrig_disk_read,
+					  &blink_delay, &blink_delay, 0);
+}
+EXPORT_SYMBOL(ledtrig_disk_activity);
+
+static int __init ledtrig_disk_init(void)
+{
+	led_trigger_register_simple("disk-activity", &ledtrig_disk);
+	led_trigger_register_simple("disk-read", &ledtrig_disk_read);
+	led_trigger_register_simple("disk-write", &ledtrig_disk_write);
+	led_trigger_register_simple("ide-disk", &ledtrig_ide);
+
+	return 0;
+}
+device_initcall(ledtrig_disk_init);
diff --git a/drivers/leds/trigger/ledtrig-gpio.c b/drivers/leds/trigger/ledtrig-gpio.c
new file mode 100644
index 000000000..0120faa3d
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-gpio.c
@@ -0,0 +1,202 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ledtrig-gio.c - LED Trigger Based on GPIO events
+ *
+ * Copyright 2009 Felipe Balbi <me@felipebalbi.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+#include "../leds.h"
+
+struct gpio_trig_data {
+	struct led_classdev *led;
+
+	unsigned desired_brightness;	/* desired brightness when led is on */
+	unsigned inverted;		/* true when gpio is inverted */
+	unsigned gpio;			/* gpio that triggers the leds */
+};
+
+static irqreturn_t gpio_trig_irq(int irq, void *_led)
+{
+	struct led_classdev *led = _led;
+	struct gpio_trig_data *gpio_data = led_get_trigger_data(led);
+	int tmp;
+
+	tmp = gpio_get_value_cansleep(gpio_data->gpio);
+	if (gpio_data->inverted)
+		tmp = !tmp;
+
+	if (tmp) {
+		if (gpio_data->desired_brightness)
+			led_set_brightness_nosleep(gpio_data->led,
+					   gpio_data->desired_brightness);
+		else
+			led_set_brightness_nosleep(gpio_data->led, LED_FULL);
+	} else {
+		led_set_brightness_nosleep(gpio_data->led, LED_OFF);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static ssize_t gpio_trig_brightness_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", gpio_data->desired_brightness);
+}
+
+static ssize_t gpio_trig_brightness_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t n)
+{
+	struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
+	unsigned desired_brightness;
+	int ret;
+
+	ret = sscanf(buf, "%u", &desired_brightness);
+	if (ret < 1 || desired_brightness > 255) {
+		dev_err(dev, "invalid value\n");
+		return -EINVAL;
+	}
+
+	gpio_data->desired_brightness = desired_brightness;
+
+	return n;
+}
+static DEVICE_ATTR(desired_brightness, 0644, gpio_trig_brightness_show,
+		gpio_trig_brightness_store);
+
+static ssize_t gpio_trig_inverted_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", gpio_data->inverted);
+}
+
+static ssize_t gpio_trig_inverted_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t n)
+{
+	struct led_classdev *led = led_trigger_get_led(dev);
+	struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
+	unsigned long inverted;
+	int ret;
+
+	ret = kstrtoul(buf, 10, &inverted);
+	if (ret < 0)
+		return ret;
+
+	if (inverted > 1)
+		return -EINVAL;
+
+	gpio_data->inverted = inverted;
+
+	/* After inverting, we need to update the LED. */
+	if (gpio_is_valid(gpio_data->gpio))
+		gpio_trig_irq(0, led);
+
+	return n;
+}
+static DEVICE_ATTR(inverted, 0644, gpio_trig_inverted_show,
+		gpio_trig_inverted_store);
+
+static ssize_t gpio_trig_gpio_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", gpio_data->gpio);
+}
+
+static ssize_t gpio_trig_gpio_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t n)
+{
+	struct led_classdev *led = led_trigger_get_led(dev);
+	struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
+	unsigned gpio;
+	int ret;
+
+	ret = sscanf(buf, "%u", &gpio);
+	if (ret < 1) {
+		dev_err(dev, "couldn't read gpio number\n");
+		return -EINVAL;
+	}
+
+	if (gpio_data->gpio == gpio)
+		return n;
+
+	if (!gpio_is_valid(gpio)) {
+		if (gpio_is_valid(gpio_data->gpio))
+			free_irq(gpio_to_irq(gpio_data->gpio), led);
+		gpio_data->gpio = gpio;
+		return n;
+	}
+
+	ret = request_threaded_irq(gpio_to_irq(gpio), NULL, gpio_trig_irq,
+			IRQF_ONESHOT | IRQF_SHARED | IRQF_TRIGGER_RISING
+			| IRQF_TRIGGER_FALLING, "ledtrig-gpio", led);
+	if (ret) {
+		dev_err(dev, "request_irq failed with error %d\n", ret);
+	} else {
+		if (gpio_is_valid(gpio_data->gpio))
+			free_irq(gpio_to_irq(gpio_data->gpio), led);
+		gpio_data->gpio = gpio;
+		/* After changing the GPIO, we need to update the LED. */
+		gpio_trig_irq(0, led);
+	}
+
+	return ret ? ret : n;
+}
+static DEVICE_ATTR(gpio, 0644, gpio_trig_gpio_show, gpio_trig_gpio_store);
+
+static struct attribute *gpio_trig_attrs[] = {
+	&dev_attr_desired_brightness.attr,
+	&dev_attr_inverted.attr,
+	&dev_attr_gpio.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(gpio_trig);
+
+static int gpio_trig_activate(struct led_classdev *led)
+{
+	struct gpio_trig_data *gpio_data;
+
+	gpio_data = kzalloc(sizeof(*gpio_data), GFP_KERNEL);
+	if (!gpio_data)
+		return -ENOMEM;
+
+	gpio_data->led = led;
+	gpio_data->gpio = -ENOENT;
+
+	led_set_trigger_data(led, gpio_data);
+
+	return 0;
+}
+
+static void gpio_trig_deactivate(struct led_classdev *led)
+{
+	struct gpio_trig_data *gpio_data = led_get_trigger_data(led);
+
+	if (gpio_is_valid(gpio_data->gpio))
+		free_irq(gpio_to_irq(gpio_data->gpio), led);
+	kfree(gpio_data);
+}
+
+static struct led_trigger gpio_led_trigger = {
+	.name		= "gpio",
+	.activate	= gpio_trig_activate,
+	.deactivate	= gpio_trig_deactivate,
+	.groups		= gpio_trig_groups,
+};
+module_led_trigger(gpio_led_trigger);
+
+MODULE_AUTHOR("Felipe Balbi <me@felipebalbi.com>");
+MODULE_DESCRIPTION("GPIO LED trigger");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/leds/trigger/ledtrig-heartbeat.c b/drivers/leds/trigger/ledtrig-heartbeat.c
new file mode 100644
index 000000000..7fe0a0557
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-heartbeat.c
@@ -0,0 +1,213 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * LED Heartbeat Trigger
+ *
+ * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
+ *
+ * Based on Richard Purdie's ledtrig-timer.c and some arch's
+ * CONFIG_HEARTBEAT code.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/panic_notifier.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+#include <linux/sched.h>
+#include <linux/sched/loadavg.h>
+#include <linux/leds.h>
+#include <linux/reboot.h>
+#include "../leds.h"
+
+static int panic_heartbeats;
+
+struct heartbeat_trig_data {
+	struct led_classdev *led_cdev;
+	unsigned int phase;
+	unsigned int period;
+	struct timer_list timer;
+	unsigned int invert;
+};
+
+static void led_heartbeat_function(struct timer_list *t)
+{
+	struct heartbeat_trig_data *heartbeat_data =
+		from_timer(heartbeat_data, t, timer);
+	struct led_classdev *led_cdev;
+	unsigned long brightness = LED_OFF;
+	unsigned long delay = 0;
+
+	led_cdev = heartbeat_data->led_cdev;
+
+	if (unlikely(panic_heartbeats)) {
+		led_set_brightness_nosleep(led_cdev, LED_OFF);
+		return;
+	}
+
+	if (test_and_clear_bit(LED_BLINK_BRIGHTNESS_CHANGE, &led_cdev->work_flags))
+		led_cdev->blink_brightness = led_cdev->new_blink_brightness;
+
+	/* acts like an actual heart beat -- ie thump-thump-pause... */
+	switch (heartbeat_data->phase) {
+	case 0:
+		/*
+		 * The hyperbolic function below modifies the
+		 * heartbeat period length in dependency of the
+		 * current (1min) load. It goes through the points
+		 * f(0)=1260, f(1)=860, f(5)=510, f(inf)->300.
+		 */
+		heartbeat_data->period = 300 +
+			(6720 << FSHIFT) / (5 * avenrun[0] + (7 << FSHIFT));
+		heartbeat_data->period =
+			msecs_to_jiffies(heartbeat_data->period);
+		delay = msecs_to_jiffies(70);
+		heartbeat_data->phase++;
+		if (!heartbeat_data->invert)
+			brightness = led_cdev->blink_brightness;
+		break;
+	case 1:
+		delay = heartbeat_data->period / 4 - msecs_to_jiffies(70);
+		heartbeat_data->phase++;
+		if (heartbeat_data->invert)
+			brightness = led_cdev->blink_brightness;
+		break;
+	case 2:
+		delay = msecs_to_jiffies(70);
+		heartbeat_data->phase++;
+		if (!heartbeat_data->invert)
+			brightness = led_cdev->blink_brightness;
+		break;
+	default:
+		delay = heartbeat_data->period - heartbeat_data->period / 4 -
+			msecs_to_jiffies(70);
+		heartbeat_data->phase = 0;
+		if (heartbeat_data->invert)
+			brightness = led_cdev->blink_brightness;
+		break;
+	}
+
+	led_set_brightness_nosleep(led_cdev, brightness);
+	mod_timer(&heartbeat_data->timer, jiffies + delay);
+}
+
+static ssize_t led_invert_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct heartbeat_trig_data *heartbeat_data =
+		led_trigger_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", heartbeat_data->invert);
+}
+
+static ssize_t led_invert_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct heartbeat_trig_data *heartbeat_data =
+		led_trigger_get_drvdata(dev);
+	unsigned long state;
+	int ret;
+
+	ret = kstrtoul(buf, 0, &state);
+	if (ret)
+		return ret;
+
+	heartbeat_data->invert = !!state;
+
+	return size;
+}
+
+static DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store);
+
+static struct attribute *heartbeat_trig_attrs[] = {
+	&dev_attr_invert.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(heartbeat_trig);
+
+static int heartbeat_trig_activate(struct led_classdev *led_cdev)
+{
+	struct heartbeat_trig_data *heartbeat_data;
+
+	heartbeat_data = kzalloc(sizeof(*heartbeat_data), GFP_KERNEL);
+	if (!heartbeat_data)
+		return -ENOMEM;
+
+	led_set_trigger_data(led_cdev, heartbeat_data);
+	heartbeat_data->led_cdev = led_cdev;
+
+	timer_setup(&heartbeat_data->timer, led_heartbeat_function, 0);
+	heartbeat_data->phase = 0;
+	if (!led_cdev->blink_brightness)
+		led_cdev->blink_brightness = led_cdev->max_brightness;
+	led_heartbeat_function(&heartbeat_data->timer);
+	set_bit(LED_BLINK_SW, &led_cdev->work_flags);
+
+	return 0;
+}
+
+static void heartbeat_trig_deactivate(struct led_classdev *led_cdev)
+{
+	struct heartbeat_trig_data *heartbeat_data =
+		led_get_trigger_data(led_cdev);
+
+	del_timer_sync(&heartbeat_data->timer);
+	kfree(heartbeat_data);
+	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
+}
+
+static struct led_trigger heartbeat_led_trigger = {
+	.name     = "heartbeat",
+	.activate = heartbeat_trig_activate,
+	.deactivate = heartbeat_trig_deactivate,
+	.groups = heartbeat_trig_groups,
+};
+
+static int heartbeat_reboot_notifier(struct notifier_block *nb,
+				     unsigned long code, void *unused)
+{
+	led_trigger_unregister(&heartbeat_led_trigger);
+	return NOTIFY_DONE;
+}
+
+static int heartbeat_panic_notifier(struct notifier_block *nb,
+				     unsigned long code, void *unused)
+{
+	panic_heartbeats = 1;
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block heartbeat_reboot_nb = {
+	.notifier_call = heartbeat_reboot_notifier,
+};
+
+static struct notifier_block heartbeat_panic_nb = {
+	.notifier_call = heartbeat_panic_notifier,
+};
+
+static int __init heartbeat_trig_init(void)
+{
+	int rc = led_trigger_register(&heartbeat_led_trigger);
+
+	if (!rc) {
+		atomic_notifier_chain_register(&panic_notifier_list,
+					       &heartbeat_panic_nb);
+		register_reboot_notifier(&heartbeat_reboot_nb);
+	}
+	return rc;
+}
+
+static void __exit heartbeat_trig_exit(void)
+{
+	unregister_reboot_notifier(&heartbeat_reboot_nb);
+	atomic_notifier_chain_unregister(&panic_notifier_list,
+					 &heartbeat_panic_nb);
+	led_trigger_unregister(&heartbeat_led_trigger);
+}
+
+module_init(heartbeat_trig_init);
+module_exit(heartbeat_trig_exit);
+
+MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
+MODULE_DESCRIPTION("Heartbeat LED trigger");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/leds/trigger/ledtrig-mtd.c b/drivers/leds/trigger/ledtrig-mtd.c
new file mode 100644
index 000000000..8fa763c22
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-mtd.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * LED MTD trigger
+ *
+ * Copyright 2016 Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
+ *
+ * Based on LED IDE-Disk Activity Trigger
+ *
+ * Copyright 2006 Openedhand Ltd.
+ *
+ * Author: Richard Purdie <rpurdie@openedhand.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/leds.h>
+
+#define BLINK_DELAY 30
+
+DEFINE_LED_TRIGGER(ledtrig_mtd);
+DEFINE_LED_TRIGGER(ledtrig_nand);
+
+void ledtrig_mtd_activity(void)
+{
+	unsigned long blink_delay = BLINK_DELAY;
+
+	led_trigger_blink_oneshot(ledtrig_mtd,
+				  &blink_delay, &blink_delay, 0);
+	led_trigger_blink_oneshot(ledtrig_nand,
+				  &blink_delay, &blink_delay, 0);
+}
+EXPORT_SYMBOL(ledtrig_mtd_activity);
+
+static int __init ledtrig_mtd_init(void)
+{
+	led_trigger_register_simple("mtd", &ledtrig_mtd);
+	led_trigger_register_simple("nand-disk", &ledtrig_nand);
+
+	return 0;
+}
+device_initcall(ledtrig_mtd_init);
diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
new file mode 100644
index 000000000..f4d670ec3
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -0,0 +1,465 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright 2017 Ben Whitten <ben.whitten@gmail.com>
+// Copyright 2007 Oliver Jowett <oliver@opencloud.com>
+//
+// LED Kernel Netdev Trigger
+//
+// Toggles the LED to reflect the link and traffic state of a named net device
+//
+// Derived from ledtrig-timer.c which is:
+//  Copyright 2005-2006 Openedhand Ltd.
+//  Author: Richard Purdie <rpurdie@openedhand.com>
+
+#include <linux/atomic.h>
+#include <linux/ctype.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/spinlock.h>
+#include <linux/timer.h>
+#include "../leds.h"
+
+/*
+ * Configurable sysfs attributes:
+ *
+ * device_name - network device name to monitor
+ * interval - duration of LED blink, in milliseconds
+ * link -  LED's normal state reflects whether the link is up
+ *         (has carrier) or not
+ * tx -  LED blinks on transmitted data
+ * rx -  LED blinks on receive data
+ *
+ */
+
+struct led_netdev_data {
+	spinlock_t lock;
+
+	struct delayed_work work;
+	struct notifier_block notifier;
+
+	struct led_classdev *led_cdev;
+	struct net_device *net_dev;
+
+	char device_name[IFNAMSIZ];
+	atomic_t interval;
+	unsigned int last_activity;
+
+	unsigned long mode;
+#define NETDEV_LED_LINK	0
+#define NETDEV_LED_TX	1
+#define NETDEV_LED_RX	2
+#define NETDEV_LED_MODE_LINKUP	3
+};
+
+enum netdev_led_attr {
+	NETDEV_ATTR_LINK,
+	NETDEV_ATTR_TX,
+	NETDEV_ATTR_RX
+};
+
+static void set_baseline_state(struct led_netdev_data *trigger_data)
+{
+	int current_brightness;
+	struct led_classdev *led_cdev = trigger_data->led_cdev;
+
+	current_brightness = led_cdev->brightness;
+	if (current_brightness)
+		led_cdev->blink_brightness = current_brightness;
+	if (!led_cdev->blink_brightness)
+		led_cdev->blink_brightness = led_cdev->max_brightness;
+
+	if (!test_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode))
+		led_set_brightness(led_cdev, LED_OFF);
+	else {
+		if (test_bit(NETDEV_LED_LINK, &trigger_data->mode))
+			led_set_brightness(led_cdev,
+					   led_cdev->blink_brightness);
+		else
+			led_set_brightness(led_cdev, LED_OFF);
+
+		/* If we are looking for RX/TX start periodically
+		 * checking stats
+		 */
+		if (test_bit(NETDEV_LED_TX, &trigger_data->mode) ||
+		    test_bit(NETDEV_LED_RX, &trigger_data->mode))
+			schedule_delayed_work(&trigger_data->work, 0);
+	}
+}
+
+static ssize_t device_name_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
+	ssize_t len;
+
+	spin_lock_bh(&trigger_data->lock);
+	len = sprintf(buf, "%s\n", trigger_data->device_name);
+	spin_unlock_bh(&trigger_data->lock);
+
+	return len;
+}
+
+static ssize_t device_name_store(struct device *dev,
+				 struct device_attribute *attr, const char *buf,
+				 size_t size)
+{
+	struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
+
+	if (size >= IFNAMSIZ)
+		return -EINVAL;
+
+	cancel_delayed_work_sync(&trigger_data->work);
+
+	spin_lock_bh(&trigger_data->lock);
+
+	if (trigger_data->net_dev) {
+		dev_put(trigger_data->net_dev);
+		trigger_data->net_dev = NULL;
+	}
+
+	memcpy(trigger_data->device_name, buf, size);
+	trigger_data->device_name[size] = 0;
+	if (size > 0 && trigger_data->device_name[size - 1] == '\n')
+		trigger_data->device_name[size - 1] = 0;
+
+	if (trigger_data->device_name[0] != 0)
+		trigger_data->net_dev =
+		    dev_get_by_name(&init_net, trigger_data->device_name);
+
+	clear_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
+	if (trigger_data->net_dev != NULL)
+		if (netif_carrier_ok(trigger_data->net_dev))
+			set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
+
+	trigger_data->last_activity = 0;
+
+	set_baseline_state(trigger_data);
+	spin_unlock_bh(&trigger_data->lock);
+
+	return size;
+}
+
+static DEVICE_ATTR_RW(device_name);
+
+static ssize_t netdev_led_attr_show(struct device *dev, char *buf,
+	enum netdev_led_attr attr)
+{
+	struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
+	int bit;
+
+	switch (attr) {
+	case NETDEV_ATTR_LINK:
+		bit = NETDEV_LED_LINK;
+		break;
+	case NETDEV_ATTR_TX:
+		bit = NETDEV_LED_TX;
+		break;
+	case NETDEV_ATTR_RX:
+		bit = NETDEV_LED_RX;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return sprintf(buf, "%u\n", test_bit(bit, &trigger_data->mode));
+}
+
+static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,
+	size_t size, enum netdev_led_attr attr)
+{
+	struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
+	unsigned long state;
+	int ret;
+	int bit;
+
+	ret = kstrtoul(buf, 0, &state);
+	if (ret)
+		return ret;
+
+	switch (attr) {
+	case NETDEV_ATTR_LINK:
+		bit = NETDEV_LED_LINK;
+		break;
+	case NETDEV_ATTR_TX:
+		bit = NETDEV_LED_TX;
+		break;
+	case NETDEV_ATTR_RX:
+		bit = NETDEV_LED_RX;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	cancel_delayed_work_sync(&trigger_data->work);
+
+	if (state)
+		set_bit(bit, &trigger_data->mode);
+	else
+		clear_bit(bit, &trigger_data->mode);
+
+	set_baseline_state(trigger_data);
+
+	return size;
+}
+
+static ssize_t link_show(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	return netdev_led_attr_show(dev, buf, NETDEV_ATTR_LINK);
+}
+
+static ssize_t link_store(struct device *dev,
+	struct device_attribute *attr, const char *buf, size_t size)
+{
+	return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_LINK);
+}
+
+static DEVICE_ATTR_RW(link);
+
+static ssize_t tx_show(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	return netdev_led_attr_show(dev, buf, NETDEV_ATTR_TX);
+}
+
+static ssize_t tx_store(struct device *dev,
+	struct device_attribute *attr, const char *buf, size_t size)
+{
+	return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_TX);
+}
+
+static DEVICE_ATTR_RW(tx);
+
+static ssize_t rx_show(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	return netdev_led_attr_show(dev, buf, NETDEV_ATTR_RX);
+}
+
+static ssize_t rx_store(struct device *dev,
+	struct device_attribute *attr, const char *buf, size_t size)
+{
+	return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_RX);
+}
+
+static DEVICE_ATTR_RW(rx);
+
+static ssize_t interval_show(struct device *dev,
+			     struct device_attribute *attr, char *buf)
+{
+	struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n",
+		       jiffies_to_msecs(atomic_read(&trigger_data->interval)));
+}
+
+static ssize_t interval_store(struct device *dev,
+			      struct device_attribute *attr, const char *buf,
+			      size_t size)
+{
+	struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
+	unsigned long value;
+	int ret;
+
+	ret = kstrtoul(buf, 0, &value);
+	if (ret)
+		return ret;
+
+	/* impose some basic bounds on the timer interval */
+	if (value >= 5 && value <= 10000) {
+		cancel_delayed_work_sync(&trigger_data->work);
+
+		atomic_set(&trigger_data->interval, msecs_to_jiffies(value));
+		set_baseline_state(trigger_data);	/* resets timer */
+	}
+
+	return size;
+}
+
+static DEVICE_ATTR_RW(interval);
+
+static struct attribute *netdev_trig_attrs[] = {
+	&dev_attr_device_name.attr,
+	&dev_attr_link.attr,
+	&dev_attr_rx.attr,
+	&dev_attr_tx.attr,
+	&dev_attr_interval.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(netdev_trig);
+
+static int netdev_trig_notify(struct notifier_block *nb,
+			      unsigned long evt, void *dv)
+{
+	struct net_device *dev =
+		netdev_notifier_info_to_dev((struct netdev_notifier_info *)dv);
+	struct led_netdev_data *trigger_data =
+		container_of(nb, struct led_netdev_data, notifier);
+
+	if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE
+	    && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER
+	    && evt != NETDEV_CHANGENAME)
+		return NOTIFY_DONE;
+
+	if (!(dev == trigger_data->net_dev ||
+	      (evt == NETDEV_CHANGENAME && !strcmp(dev->name, trigger_data->device_name)) ||
+	      (evt == NETDEV_REGISTER && !strcmp(dev->name, trigger_data->device_name))))
+		return NOTIFY_DONE;
+
+	cancel_delayed_work_sync(&trigger_data->work);
+
+	spin_lock_bh(&trigger_data->lock);
+
+	clear_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
+	switch (evt) {
+	case NETDEV_CHANGENAME:
+		if (netif_carrier_ok(dev))
+			set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
+		fallthrough;
+	case NETDEV_REGISTER:
+		if (trigger_data->net_dev)
+			dev_put(trigger_data->net_dev);
+		dev_hold(dev);
+		trigger_data->net_dev = dev;
+		break;
+	case NETDEV_UNREGISTER:
+		dev_put(trigger_data->net_dev);
+		trigger_data->net_dev = NULL;
+		break;
+	case NETDEV_UP:
+	case NETDEV_CHANGE:
+		if (netif_carrier_ok(dev))
+			set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
+		break;
+	}
+
+	set_baseline_state(trigger_data);
+
+	spin_unlock_bh(&trigger_data->lock);
+
+	return NOTIFY_DONE;
+}
+
+/* here's the real work! */
+static void netdev_trig_work(struct work_struct *work)
+{
+	struct led_netdev_data *trigger_data =
+		container_of(work, struct led_netdev_data, work.work);
+	struct rtnl_link_stats64 *dev_stats;
+	unsigned int new_activity;
+	struct rtnl_link_stats64 temp;
+	unsigned long interval;
+	int invert;
+
+	/* If we dont have a device, insure we are off */
+	if (!trigger_data->net_dev) {
+		led_set_brightness(trigger_data->led_cdev, LED_OFF);
+		return;
+	}
+
+	/* If we are not looking for RX/TX then return  */
+	if (!test_bit(NETDEV_LED_TX, &trigger_data->mode) &&
+	    !test_bit(NETDEV_LED_RX, &trigger_data->mode))
+		return;
+
+	dev_stats = dev_get_stats(trigger_data->net_dev, &temp);
+	new_activity =
+	    (test_bit(NETDEV_LED_TX, &trigger_data->mode) ?
+		dev_stats->tx_packets : 0) +
+	    (test_bit(NETDEV_LED_RX, &trigger_data->mode) ?
+		dev_stats->rx_packets : 0);
+
+	if (trigger_data->last_activity != new_activity) {
+		led_stop_software_blink(trigger_data->led_cdev);
+
+		invert = test_bit(NETDEV_LED_LINK, &trigger_data->mode);
+		interval = jiffies_to_msecs(
+				atomic_read(&trigger_data->interval));
+		/* base state is ON (link present) */
+		led_blink_set_oneshot(trigger_data->led_cdev,
+				      &interval,
+				      &interval,
+				      invert);
+		trigger_data->last_activity = new_activity;
+	}
+
+	schedule_delayed_work(&trigger_data->work,
+			(atomic_read(&trigger_data->interval)*2));
+}
+
+static int netdev_trig_activate(struct led_classdev *led_cdev)
+{
+	struct led_netdev_data *trigger_data;
+	int rc;
+
+	trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL);
+	if (!trigger_data)
+		return -ENOMEM;
+
+	spin_lock_init(&trigger_data->lock);
+
+	trigger_data->notifier.notifier_call = netdev_trig_notify;
+	trigger_data->notifier.priority = 10;
+
+	INIT_DELAYED_WORK(&trigger_data->work, netdev_trig_work);
+
+	trigger_data->led_cdev = led_cdev;
+	trigger_data->net_dev = NULL;
+	trigger_data->device_name[0] = 0;
+
+	trigger_data->mode = 0;
+	atomic_set(&trigger_data->interval, msecs_to_jiffies(50));
+	trigger_data->last_activity = 0;
+
+	led_set_trigger_data(led_cdev, trigger_data);
+
+	rc = register_netdevice_notifier(&trigger_data->notifier);
+	if (rc)
+		kfree(trigger_data);
+
+	return rc;
+}
+
+static void netdev_trig_deactivate(struct led_classdev *led_cdev)
+{
+	struct led_netdev_data *trigger_data = led_get_trigger_data(led_cdev);
+
+	unregister_netdevice_notifier(&trigger_data->notifier);
+
+	cancel_delayed_work_sync(&trigger_data->work);
+
+	if (trigger_data->net_dev)
+		dev_put(trigger_data->net_dev);
+
+	kfree(trigger_data);
+}
+
+static struct led_trigger netdev_led_trigger = {
+	.name = "netdev",
+	.activate = netdev_trig_activate,
+	.deactivate = netdev_trig_deactivate,
+	.groups = netdev_trig_groups,
+};
+
+static int __init netdev_trig_init(void)
+{
+	return led_trigger_register(&netdev_led_trigger);
+}
+
+static void __exit netdev_trig_exit(void)
+{
+	led_trigger_unregister(&netdev_led_trigger);
+}
+
+module_init(netdev_trig_init);
+module_exit(netdev_trig_exit);
+
+MODULE_AUTHOR("Ben Whitten <ben.whitten@gmail.com>");
+MODULE_AUTHOR("Oliver Jowett <oliver@opencloud.com>");
+MODULE_DESCRIPTION("Netdev LED trigger");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/leds/trigger/ledtrig-oneshot.c b/drivers/leds/trigger/ledtrig-oneshot.c
new file mode 100644
index 000000000..bee3bd452
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-oneshot.c
@@ -0,0 +1,200 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * One-shot LED Trigger
+ *
+ * Copyright 2012, Fabio Baltieri <fabio.baltieri@gmail.com>
+ *
+ * Based on ledtrig-timer.c by Richard Purdie <rpurdie@openedhand.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/ctype.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+#include "../leds.h"
+
+#define DEFAULT_DELAY 100
+
+struct oneshot_trig_data {
+	unsigned int invert;
+};
+
+static ssize_t led_shot(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = led_trigger_get_led(dev);
+	struct oneshot_trig_data *oneshot_data = led_trigger_get_drvdata(dev);
+
+	led_blink_set_oneshot(led_cdev,
+			&led_cdev->blink_delay_on, &led_cdev->blink_delay_off,
+			oneshot_data->invert);
+
+	/* content is ignored */
+	return size;
+}
+static ssize_t led_invert_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct oneshot_trig_data *oneshot_data = led_trigger_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", oneshot_data->invert);
+}
+
+static ssize_t led_invert_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = led_trigger_get_led(dev);
+	struct oneshot_trig_data *oneshot_data = led_trigger_get_drvdata(dev);
+	unsigned long state;
+	int ret;
+
+	ret = kstrtoul(buf, 0, &state);
+	if (ret)
+		return ret;
+
+	oneshot_data->invert = !!state;
+
+	if (oneshot_data->invert)
+		led_set_brightness_nosleep(led_cdev, LED_FULL);
+	else
+		led_set_brightness_nosleep(led_cdev, LED_OFF);
+
+	return size;
+}
+
+static ssize_t led_delay_on_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = led_trigger_get_led(dev);
+
+	return sprintf(buf, "%lu\n", led_cdev->blink_delay_on);
+}
+
+static ssize_t led_delay_on_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = led_trigger_get_led(dev);
+	unsigned long state;
+	int ret;
+
+	ret = kstrtoul(buf, 0, &state);
+	if (ret)
+		return ret;
+
+	led_cdev->blink_delay_on = state;
+
+	return size;
+}
+
+static ssize_t led_delay_off_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = led_trigger_get_led(dev);
+
+	return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);
+}
+
+static ssize_t led_delay_off_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = led_trigger_get_led(dev);
+	unsigned long state;
+	int ret;
+
+	ret = kstrtoul(buf, 0, &state);
+	if (ret)
+		return ret;
+
+	led_cdev->blink_delay_off = state;
+
+	return size;
+}
+
+static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
+static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
+static DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store);
+static DEVICE_ATTR(shot, 0200, NULL, led_shot);
+
+static struct attribute *oneshot_trig_attrs[] = {
+	&dev_attr_delay_on.attr,
+	&dev_attr_delay_off.attr,
+	&dev_attr_invert.attr,
+	&dev_attr_shot.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(oneshot_trig);
+
+static void pattern_init(struct led_classdev *led_cdev)
+{
+	u32 *pattern;
+	unsigned int size = 0;
+
+	pattern = led_get_default_pattern(led_cdev, &size);
+	if (!pattern)
+		goto out_default;
+
+	if (size != 2) {
+		dev_warn(led_cdev->dev,
+			 "Expected 2 but got %u values for delays pattern\n",
+			 size);
+		goto out_default;
+	}
+
+	led_cdev->blink_delay_on = pattern[0];
+	led_cdev->blink_delay_off = pattern[1];
+	kfree(pattern);
+
+	return;
+
+out_default:
+	kfree(pattern);
+	led_cdev->blink_delay_on = DEFAULT_DELAY;
+	led_cdev->blink_delay_off = DEFAULT_DELAY;
+}
+
+static int oneshot_trig_activate(struct led_classdev *led_cdev)
+{
+	struct oneshot_trig_data *oneshot_data;
+
+	oneshot_data = kzalloc(sizeof(*oneshot_data), GFP_KERNEL);
+	if (!oneshot_data)
+		return -ENOMEM;
+
+	led_set_trigger_data(led_cdev, oneshot_data);
+
+	if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) {
+		pattern_init(led_cdev);
+		/*
+		 * Mark as initialized even on pattern_init() error because
+		 * any consecutive call to it would produce the same error.
+		 */
+		led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER;
+	}
+
+	return 0;
+}
+
+static void oneshot_trig_deactivate(struct led_classdev *led_cdev)
+{
+	struct oneshot_trig_data *oneshot_data = led_get_trigger_data(led_cdev);
+
+	kfree(oneshot_data);
+
+	/* Stop blinking */
+	led_set_brightness(led_cdev, LED_OFF);
+}
+
+static struct led_trigger oneshot_led_trigger = {
+	.name     = "oneshot",
+	.activate = oneshot_trig_activate,
+	.deactivate = oneshot_trig_deactivate,
+	.groups = oneshot_trig_groups,
+};
+module_led_trigger(oneshot_led_trigger);
+
+MODULE_AUTHOR("Fabio Baltieri <fabio.baltieri@gmail.com>");
+MODULE_DESCRIPTION("One-shot LED trigger");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/leds/trigger/ledtrig-panic.c b/drivers/leds/trigger/ledtrig-panic.c
new file mode 100644
index 000000000..64abf2e91
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-panic.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Kernel Panic LED Trigger
+ *
+ * Copyright 2016 Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/notifier.h>
+#include <linux/panic_notifier.h>
+#include <linux/leds.h>
+#include "../leds.h"
+
+static struct led_trigger *trigger;
+
+/*
+ * This is called in a special context by the atomic panic
+ * notifier. This means the trigger can be changed without
+ * worrying about locking.
+ */
+static void led_trigger_set_panic(struct led_classdev *led_cdev)
+{
+	struct led_trigger *trig;
+
+	list_for_each_entry(trig, &trigger_list, next_trig) {
+		if (strcmp("panic", trig->name))
+			continue;
+		if (led_cdev->trigger)
+			list_del(&led_cdev->trig_list);
+		list_add_tail(&led_cdev->trig_list, &trig->led_cdevs);
+
+		/* Avoid the delayed blink path */
+		led_cdev->blink_delay_on = 0;
+		led_cdev->blink_delay_off = 0;
+
+		led_cdev->trigger = trig;
+		if (trig->activate)
+			trig->activate(led_cdev);
+		break;
+	}
+}
+
+static int led_trigger_panic_notifier(struct notifier_block *nb,
+				      unsigned long code, void *unused)
+{
+	struct led_classdev *led_cdev;
+
+	list_for_each_entry(led_cdev, &leds_list, node)
+		if (led_cdev->flags & LED_PANIC_INDICATOR)
+			led_trigger_set_panic(led_cdev);
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block led_trigger_panic_nb = {
+	.notifier_call = led_trigger_panic_notifier,
+};
+
+static long led_panic_blink(int state)
+{
+	led_trigger_event(trigger, state ? LED_FULL : LED_OFF);
+	return 0;
+}
+
+static int __init ledtrig_panic_init(void)
+{
+	atomic_notifier_chain_register(&panic_notifier_list,
+				       &led_trigger_panic_nb);
+
+	led_trigger_register_simple("panic", &trigger);
+	panic_blink = led_panic_blink;
+	return 0;
+}
+device_initcall(ledtrig_panic_init);
diff --git a/drivers/leds/trigger/ledtrig-pattern.c b/drivers/leds/trigger/ledtrig-pattern.c
new file mode 100644
index 000000000..43a265dc4
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-pattern.c
@@ -0,0 +1,463 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * LED pattern trigger
+ *
+ * Idea discussed with Pavel Machek. Raphael Teysseyre implemented
+ * the first version, Baolin Wang simplified and improved the approach.
+ */
+
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+
+#define MAX_PATTERNS		1024
+/*
+ * When doing gradual dimming, the led brightness will be updated
+ * every 50 milliseconds.
+ */
+#define UPDATE_INTERVAL		50
+
+struct pattern_trig_data {
+	struct led_classdev *led_cdev;
+	struct led_pattern patterns[MAX_PATTERNS];
+	struct led_pattern *curr;
+	struct led_pattern *next;
+	struct mutex lock;
+	u32 npatterns;
+	int repeat;
+	int last_repeat;
+	int delta_t;
+	bool is_indefinite;
+	bool is_hw_pattern;
+	struct timer_list timer;
+};
+
+static void pattern_trig_update_patterns(struct pattern_trig_data *data)
+{
+	data->curr = data->next;
+	if (!data->is_indefinite && data->curr == data->patterns)
+		data->repeat--;
+
+	if (data->next == data->patterns + data->npatterns - 1)
+		data->next = data->patterns;
+	else
+		data->next++;
+
+	data->delta_t = 0;
+}
+
+static int pattern_trig_compute_brightness(struct pattern_trig_data *data)
+{
+	int step_brightness;
+
+	/*
+	 * If current tuple's duration is less than the dimming interval,
+	 * we should treat it as a step change of brightness instead of
+	 * doing gradual dimming.
+	 */
+	if (data->delta_t == 0 || data->curr->delta_t < UPDATE_INTERVAL)
+		return data->curr->brightness;
+
+	step_brightness = abs(data->next->brightness - data->curr->brightness);
+	step_brightness = data->delta_t * step_brightness / data->curr->delta_t;
+
+	if (data->next->brightness > data->curr->brightness)
+		return data->curr->brightness + step_brightness;
+	else
+		return data->curr->brightness - step_brightness;
+}
+
+static void pattern_trig_timer_function(struct timer_list *t)
+{
+	struct pattern_trig_data *data = from_timer(data, t, timer);
+
+	for (;;) {
+		if (!data->is_indefinite && !data->repeat)
+			break;
+
+		if (data->curr->brightness == data->next->brightness) {
+			/* Step change of brightness */
+			led_set_brightness(data->led_cdev,
+					   data->curr->brightness);
+			mod_timer(&data->timer,
+				  jiffies + msecs_to_jiffies(data->curr->delta_t));
+			if (!data->next->delta_t) {
+				/* Skip the tuple with zero duration */
+				pattern_trig_update_patterns(data);
+			}
+			/* Select next tuple */
+			pattern_trig_update_patterns(data);
+		} else {
+			/* Gradual dimming */
+
+			/*
+			 * If the accumulation time is larger than current
+			 * tuple's duration, we should go next one and re-check
+			 * if we repeated done.
+			 */
+			if (data->delta_t > data->curr->delta_t) {
+				pattern_trig_update_patterns(data);
+				continue;
+			}
+
+			led_set_brightness(data->led_cdev,
+					   pattern_trig_compute_brightness(data));
+			mod_timer(&data->timer,
+				  jiffies + msecs_to_jiffies(UPDATE_INTERVAL));
+
+			/* Accumulate the gradual dimming time */
+			data->delta_t += UPDATE_INTERVAL;
+		}
+
+		break;
+	}
+}
+
+static int pattern_trig_start_pattern(struct led_classdev *led_cdev)
+{
+	struct pattern_trig_data *data = led_cdev->trigger_data;
+
+	if (!data->npatterns)
+		return 0;
+
+	if (data->is_hw_pattern) {
+		return led_cdev->pattern_set(led_cdev, data->patterns,
+					     data->npatterns, data->repeat);
+	}
+
+	/* At least 2 tuples for software pattern. */
+	if (data->npatterns < 2)
+		return -EINVAL;
+
+	data->delta_t = 0;
+	data->curr = data->patterns;
+	data->next = data->patterns + 1;
+	data->timer.expires = jiffies;
+	add_timer(&data->timer);
+
+	return 0;
+}
+
+static ssize_t repeat_show(struct device *dev, struct device_attribute *attr,
+			   char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct pattern_trig_data *data = led_cdev->trigger_data;
+	int repeat;
+
+	mutex_lock(&data->lock);
+
+	repeat = data->last_repeat;
+
+	mutex_unlock(&data->lock);
+
+	return scnprintf(buf, PAGE_SIZE, "%d\n", repeat);
+}
+
+static ssize_t repeat_store(struct device *dev, struct device_attribute *attr,
+			    const char *buf, size_t count)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct pattern_trig_data *data = led_cdev->trigger_data;
+	int err, res;
+
+	err = kstrtos32(buf, 10, &res);
+	if (err)
+		return err;
+
+	/* Number 0 and negative numbers except -1 are invalid. */
+	if (res < -1 || res == 0)
+		return -EINVAL;
+
+	mutex_lock(&data->lock);
+
+	del_timer_sync(&data->timer);
+
+	if (data->is_hw_pattern)
+		led_cdev->pattern_clear(led_cdev);
+
+	data->last_repeat = data->repeat = res;
+	/* -1 means repeat indefinitely */
+	if (data->repeat == -1)
+		data->is_indefinite = true;
+	else
+		data->is_indefinite = false;
+
+	err = pattern_trig_start_pattern(led_cdev);
+
+	mutex_unlock(&data->lock);
+	return err < 0 ? err : count;
+}
+
+static DEVICE_ATTR_RW(repeat);
+
+static ssize_t pattern_trig_show_patterns(struct pattern_trig_data *data,
+					  char *buf, bool hw_pattern)
+{
+	ssize_t count = 0;
+	int i;
+
+	mutex_lock(&data->lock);
+
+	if (!data->npatterns || (data->is_hw_pattern ^ hw_pattern))
+		goto out;
+
+	for (i = 0; i < data->npatterns; i++) {
+		count += scnprintf(buf + count, PAGE_SIZE - count,
+				   "%d %u ",
+				   data->patterns[i].brightness,
+				   data->patterns[i].delta_t);
+	}
+
+	buf[count - 1] = '\n';
+
+out:
+	mutex_unlock(&data->lock);
+	return count;
+}
+
+static int pattern_trig_store_patterns_string(struct pattern_trig_data *data,
+					      const char *buf, size_t count)
+{
+	int ccount, cr, offset = 0;
+
+	while (offset < count - 1 && data->npatterns < MAX_PATTERNS) {
+		cr = 0;
+		ccount = sscanf(buf + offset, "%u %u %n",
+				&data->patterns[data->npatterns].brightness,
+				&data->patterns[data->npatterns].delta_t, &cr);
+
+		if (ccount != 2 ||
+		    data->patterns[data->npatterns].brightness > data->led_cdev->max_brightness) {
+			data->npatterns = 0;
+			return -EINVAL;
+		}
+
+		offset += cr;
+		data->npatterns++;
+	}
+
+	return 0;
+}
+
+static int pattern_trig_store_patterns_int(struct pattern_trig_data *data,
+					   const u32 *buf, size_t count)
+{
+	unsigned int i;
+
+	for (i = 0; i < count; i += 2) {
+		data->patterns[data->npatterns].brightness = buf[i];
+		data->patterns[data->npatterns].delta_t = buf[i + 1];
+		data->npatterns++;
+	}
+
+	return 0;
+}
+
+static ssize_t pattern_trig_store_patterns(struct led_classdev *led_cdev,
+					   const char *buf, const u32 *buf_int,
+					   size_t count, bool hw_pattern)
+{
+	struct pattern_trig_data *data = led_cdev->trigger_data;
+	int err = 0;
+
+	mutex_lock(&data->lock);
+
+	del_timer_sync(&data->timer);
+
+	if (data->is_hw_pattern)
+		led_cdev->pattern_clear(led_cdev);
+
+	data->is_hw_pattern = hw_pattern;
+	data->npatterns = 0;
+
+	if (buf)
+		err = pattern_trig_store_patterns_string(data, buf, count);
+	else
+		err = pattern_trig_store_patterns_int(data, buf_int, count);
+	if (err)
+		goto out;
+
+	err = pattern_trig_start_pattern(led_cdev);
+	if (err)
+		data->npatterns = 0;
+
+out:
+	mutex_unlock(&data->lock);
+	return err < 0 ? err : count;
+}
+
+static ssize_t pattern_show(struct device *dev, struct device_attribute *attr,
+			    char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct pattern_trig_data *data = led_cdev->trigger_data;
+
+	return pattern_trig_show_patterns(data, buf, false);
+}
+
+static ssize_t pattern_store(struct device *dev, struct device_attribute *attr,
+			     const char *buf, size_t count)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+
+	return pattern_trig_store_patterns(led_cdev, buf, NULL, count, false);
+}
+
+static DEVICE_ATTR_RW(pattern);
+
+static ssize_t hw_pattern_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct pattern_trig_data *data = led_cdev->trigger_data;
+
+	return pattern_trig_show_patterns(data, buf, true);
+}
+
+static ssize_t hw_pattern_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+
+	return pattern_trig_store_patterns(led_cdev, buf, NULL, count, true);
+}
+
+static DEVICE_ATTR_RW(hw_pattern);
+
+static umode_t pattern_trig_attrs_mode(struct kobject *kobj,
+				       struct attribute *attr, int index)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+
+	if (attr == &dev_attr_repeat.attr || attr == &dev_attr_pattern.attr)
+		return attr->mode;
+	else if (attr == &dev_attr_hw_pattern.attr && led_cdev->pattern_set)
+		return attr->mode;
+
+	return 0;
+}
+
+static struct attribute *pattern_trig_attrs[] = {
+	&dev_attr_pattern.attr,
+	&dev_attr_hw_pattern.attr,
+	&dev_attr_repeat.attr,
+	NULL
+};
+
+static const struct attribute_group pattern_trig_group = {
+	.attrs = pattern_trig_attrs,
+	.is_visible = pattern_trig_attrs_mode,
+};
+
+static const struct attribute_group *pattern_trig_groups[] = {
+	&pattern_trig_group,
+	NULL,
+};
+
+static void pattern_init(struct led_classdev *led_cdev)
+{
+	unsigned int size = 0;
+	u32 *pattern;
+	int err;
+
+	pattern = led_get_default_pattern(led_cdev, &size);
+	if (!pattern)
+		return;
+
+	if (size % 2) {
+		dev_warn(led_cdev->dev, "Expected pattern of tuples\n");
+		goto out;
+	}
+
+	err = pattern_trig_store_patterns(led_cdev, NULL, pattern, size, false);
+	if (err < 0)
+		dev_warn(led_cdev->dev,
+			 "Pattern initialization failed with error %d\n", err);
+
+out:
+	kfree(pattern);
+}
+
+static int pattern_trig_activate(struct led_classdev *led_cdev)
+{
+	struct pattern_trig_data *data;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	if (!!led_cdev->pattern_set ^ !!led_cdev->pattern_clear) {
+		dev_warn(led_cdev->dev,
+			 "Hardware pattern ops validation failed\n");
+		led_cdev->pattern_set = NULL;
+		led_cdev->pattern_clear = NULL;
+	}
+
+	data->is_indefinite = true;
+	data->last_repeat = -1;
+	mutex_init(&data->lock);
+	data->led_cdev = led_cdev;
+	led_set_trigger_data(led_cdev, data);
+	timer_setup(&data->timer, pattern_trig_timer_function, 0);
+	led_cdev->activated = true;
+
+	if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) {
+		pattern_init(led_cdev);
+		/*
+		 * Mark as initialized even on pattern_init() error because
+		 * any consecutive call to it would produce the same error.
+		 */
+		led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER;
+	}
+
+	return 0;
+}
+
+static void pattern_trig_deactivate(struct led_classdev *led_cdev)
+{
+	struct pattern_trig_data *data = led_cdev->trigger_data;
+
+	if (!led_cdev->activated)
+		return;
+
+	if (led_cdev->pattern_clear)
+		led_cdev->pattern_clear(led_cdev);
+
+	del_timer_sync(&data->timer);
+
+	led_set_brightness(led_cdev, LED_OFF);
+	kfree(data);
+	led_cdev->activated = false;
+}
+
+static struct led_trigger pattern_led_trigger = {
+	.name = "pattern",
+	.activate = pattern_trig_activate,
+	.deactivate = pattern_trig_deactivate,
+	.groups = pattern_trig_groups,
+};
+
+static int __init pattern_trig_init(void)
+{
+	return led_trigger_register(&pattern_led_trigger);
+}
+
+static void __exit pattern_trig_exit(void)
+{
+	led_trigger_unregister(&pattern_led_trigger);
+}
+
+module_init(pattern_trig_init);
+module_exit(pattern_trig_exit);
+
+MODULE_AUTHOR("Raphael Teysseyre <rteysseyre@gmail.com>");
+MODULE_AUTHOR("Baolin Wang <baolin.wang@linaro.org>");
+MODULE_DESCRIPTION("LED Pattern trigger");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/leds/trigger/ledtrig-timer.c b/drivers/leds/trigger/ledtrig-timer.c
new file mode 100644
index 000000000..b4688d1d9
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-timer.c
@@ -0,0 +1,140 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * LED Kernel Timer Trigger
+ *
+ * Copyright 2005-2006 Openedhand Ltd.
+ *
+ * Author: Richard Purdie <rpurdie@openedhand.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/ctype.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+
+static ssize_t led_delay_on_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = led_trigger_get_led(dev);
+
+	return sprintf(buf, "%lu\n", led_cdev->blink_delay_on);
+}
+
+static ssize_t led_delay_on_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = led_trigger_get_led(dev);
+	unsigned long state;
+	ssize_t ret;
+
+	ret = kstrtoul(buf, 10, &state);
+	if (ret)
+		return ret;
+
+	led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off);
+	led_cdev->blink_delay_on = state;
+
+	return size;
+}
+
+static ssize_t led_delay_off_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = led_trigger_get_led(dev);
+
+	return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);
+}
+
+static ssize_t led_delay_off_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = led_trigger_get_led(dev);
+	unsigned long state;
+	ssize_t ret;
+
+	ret = kstrtoul(buf, 10, &state);
+	if (ret)
+		return ret;
+
+	led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state);
+	led_cdev->blink_delay_off = state;
+
+	return size;
+}
+
+static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
+static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
+
+static struct attribute *timer_trig_attrs[] = {
+	&dev_attr_delay_on.attr,
+	&dev_attr_delay_off.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(timer_trig);
+
+static void pattern_init(struct led_classdev *led_cdev)
+{
+	u32 *pattern;
+	unsigned int size = 0;
+
+	pattern = led_get_default_pattern(led_cdev, &size);
+	if (!pattern)
+		return;
+
+	if (size != 2) {
+		dev_warn(led_cdev->dev,
+			 "Expected 2 but got %u values for delays pattern\n",
+			 size);
+		goto out;
+	}
+
+	led_cdev->blink_delay_on = pattern[0];
+	led_cdev->blink_delay_off = pattern[1];
+	/* led_blink_set() called by caller */
+
+out:
+	kfree(pattern);
+}
+
+static int timer_trig_activate(struct led_classdev *led_cdev)
+{
+	if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) {
+		pattern_init(led_cdev);
+		/*
+		 * Mark as initialized even on pattern_init() error because
+		 * any consecutive call to it would produce the same error.
+		 */
+		led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER;
+	}
+
+	/*
+	 * If "set brightness to 0" is pending in workqueue, we don't
+	 * want that to be reordered after blink_set()
+	 */
+	flush_work(&led_cdev->set_brightness_work);
+	led_blink_set(led_cdev, &led_cdev->blink_delay_on,
+		      &led_cdev->blink_delay_off);
+
+	return 0;
+}
+
+static void timer_trig_deactivate(struct led_classdev *led_cdev)
+{
+	/* Stop blinking */
+	led_set_brightness(led_cdev, LED_OFF);
+}
+
+static struct led_trigger timer_led_trigger = {
+	.name     = "timer",
+	.activate = timer_trig_activate,
+	.deactivate = timer_trig_deactivate,
+	.groups = timer_trig_groups,
+};
+module_led_trigger(timer_led_trigger);
+
+MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
+MODULE_DESCRIPTION("Timer LED trigger");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/leds/trigger/ledtrig-transient.c b/drivers/leds/trigger/ledtrig-transient.c
new file mode 100644
index 000000000..80635183f
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-transient.c
@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// LED Kernel Transient Trigger
+//
+// Transient trigger allows one shot timer activation. Please refer to
+// Documentation/leds/ledtrig-transient.rst for details
+// Copyright (C) 2012 Shuah Khan <shuahkhan@gmail.com>
+//
+// Based on Richard Purdie's ledtrig-timer.c and Atsushi Nemoto's
+// ledtrig-heartbeat.c
+// Design and use-case input from Jonas Bonn <jonas@southpole.se> and
+// Neil Brown <neilb@suse.de>
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+#include <linux/leds.h>
+#include "../leds.h"
+
+struct transient_trig_data {
+	int activate;
+	int state;
+	int restore_state;
+	unsigned long duration;
+	struct timer_list timer;
+	struct led_classdev *led_cdev;
+};
+
+static void transient_timer_function(struct timer_list *t)
+{
+	struct transient_trig_data *transient_data =
+		from_timer(transient_data, t, timer);
+	struct led_classdev *led_cdev = transient_data->led_cdev;
+
+	transient_data->activate = 0;
+	led_set_brightness_nosleep(led_cdev, transient_data->restore_state);
+}
+
+static ssize_t transient_activate_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct transient_trig_data *transient_data =
+		led_trigger_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", transient_data->activate);
+}
+
+static ssize_t transient_activate_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = led_trigger_get_led(dev);
+	struct transient_trig_data *transient_data =
+		led_trigger_get_drvdata(dev);
+	unsigned long state;
+	ssize_t ret;
+
+	ret = kstrtoul(buf, 10, &state);
+	if (ret)
+		return ret;
+
+	if (state != 1 && state != 0)
+		return -EINVAL;
+
+	/* cancel the running timer */
+	if (state == 0 && transient_data->activate == 1) {
+		del_timer(&transient_data->timer);
+		transient_data->activate = state;
+		led_set_brightness_nosleep(led_cdev,
+					transient_data->restore_state);
+		return size;
+	}
+
+	/* start timer if there is no active timer */
+	if (state == 1 && transient_data->activate == 0 &&
+	    transient_data->duration != 0) {
+		transient_data->activate = state;
+		led_set_brightness_nosleep(led_cdev, transient_data->state);
+		transient_data->restore_state =
+		    (transient_data->state == LED_FULL) ? LED_OFF : LED_FULL;
+		mod_timer(&transient_data->timer,
+			  jiffies + msecs_to_jiffies(transient_data->duration));
+	}
+
+	/* state == 0 && transient_data->activate == 0
+		timer is not active - just return */
+	/* state == 1 && transient_data->activate == 1
+		timer is already active - just return */
+
+	return size;
+}
+
+static ssize_t transient_duration_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct transient_trig_data *transient_data = led_trigger_get_drvdata(dev);
+
+	return sprintf(buf, "%lu\n", transient_data->duration);
+}
+
+static ssize_t transient_duration_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct transient_trig_data *transient_data =
+		led_trigger_get_drvdata(dev);
+	unsigned long state;
+	ssize_t ret;
+
+	ret = kstrtoul(buf, 10, &state);
+	if (ret)
+		return ret;
+
+	transient_data->duration = state;
+	return size;
+}
+
+static ssize_t transient_state_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct transient_trig_data *transient_data =
+		led_trigger_get_drvdata(dev);
+	int state;
+
+	state = (transient_data->state == LED_FULL) ? 1 : 0;
+	return sprintf(buf, "%d\n", state);
+}
+
+static ssize_t transient_state_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct transient_trig_data *transient_data =
+		led_trigger_get_drvdata(dev);
+	unsigned long state;
+	ssize_t ret;
+
+	ret = kstrtoul(buf, 10, &state);
+	if (ret)
+		return ret;
+
+	if (state != 1 && state != 0)
+		return -EINVAL;
+
+	transient_data->state = (state == 1) ? LED_FULL : LED_OFF;
+	return size;
+}
+
+static DEVICE_ATTR(activate, 0644, transient_activate_show,
+		   transient_activate_store);
+static DEVICE_ATTR(duration, 0644, transient_duration_show,
+		   transient_duration_store);
+static DEVICE_ATTR(state, 0644, transient_state_show, transient_state_store);
+
+static struct attribute *transient_trig_attrs[] = {
+	&dev_attr_activate.attr,
+	&dev_attr_duration.attr,
+	&dev_attr_state.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(transient_trig);
+
+static int transient_trig_activate(struct led_classdev *led_cdev)
+{
+	struct transient_trig_data *tdata;
+
+	tdata = kzalloc(sizeof(struct transient_trig_data), GFP_KERNEL);
+	if (!tdata)
+		return -ENOMEM;
+
+	led_set_trigger_data(led_cdev, tdata);
+	tdata->led_cdev = led_cdev;
+
+	timer_setup(&tdata->timer, transient_timer_function, 0);
+
+	return 0;
+}
+
+static void transient_trig_deactivate(struct led_classdev *led_cdev)
+{
+	struct transient_trig_data *transient_data = led_get_trigger_data(led_cdev);
+
+	del_timer_sync(&transient_data->timer);
+	led_set_brightness_nosleep(led_cdev, transient_data->restore_state);
+	kfree(transient_data);
+}
+
+static struct led_trigger transient_trigger = {
+	.name     = "transient",
+	.activate = transient_trig_activate,
+	.deactivate = transient_trig_deactivate,
+	.groups = transient_trig_groups,
+};
+module_led_trigger(transient_trigger);
+
+MODULE_AUTHOR("Shuah Khan <shuahkhan@gmail.com>");
+MODULE_DESCRIPTION("Transient LED trigger");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/leds/trigger/ledtrig-tty.c b/drivers/leds/trigger/ledtrig-tty.c
new file mode 100644
index 000000000..3e69a7bde
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-tty.c
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/delay.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <uapi/linux/serial.h>
+
+#define LEDTRIG_TTY_INTERVAL	50
+
+struct ledtrig_tty_data {
+	struct led_classdev *led_cdev;
+	struct delayed_work dwork;
+	struct mutex mutex;
+	const char *ttyname;
+	struct tty_struct *tty;
+	int rx, tx;
+};
+
+static void ledtrig_tty_restart(struct ledtrig_tty_data *trigger_data)
+{
+	schedule_delayed_work(&trigger_data->dwork, 0);
+}
+
+static ssize_t ttyname_show(struct device *dev,
+			    struct device_attribute *attr, char *buf)
+{
+	struct ledtrig_tty_data *trigger_data = led_trigger_get_drvdata(dev);
+	ssize_t len = 0;
+
+	mutex_lock(&trigger_data->mutex);
+
+	if (trigger_data->ttyname)
+		len = sprintf(buf, "%s\n", trigger_data->ttyname);
+
+	mutex_unlock(&trigger_data->mutex);
+
+	return len;
+}
+
+static ssize_t ttyname_store(struct device *dev,
+			     struct device_attribute *attr, const char *buf,
+			     size_t size)
+{
+	struct ledtrig_tty_data *trigger_data = led_trigger_get_drvdata(dev);
+	char *ttyname;
+	ssize_t ret = size;
+	bool running;
+
+	if (size > 0 && buf[size - 1] == '\n')
+		size -= 1;
+
+	if (size) {
+		ttyname = kmemdup_nul(buf, size, GFP_KERNEL);
+		if (!ttyname)
+			return -ENOMEM;
+	} else {
+		ttyname = NULL;
+	}
+
+	mutex_lock(&trigger_data->mutex);
+
+	running = trigger_data->ttyname != NULL;
+
+	kfree(trigger_data->ttyname);
+	tty_kref_put(trigger_data->tty);
+	trigger_data->tty = NULL;
+
+	trigger_data->ttyname = ttyname;
+
+	mutex_unlock(&trigger_data->mutex);
+
+	if (ttyname && !running)
+		ledtrig_tty_restart(trigger_data);
+
+	return ret;
+}
+static DEVICE_ATTR_RW(ttyname);
+
+static void ledtrig_tty_work(struct work_struct *work)
+{
+	struct ledtrig_tty_data *trigger_data =
+		container_of(work, struct ledtrig_tty_data, dwork.work);
+	struct serial_icounter_struct icount;
+	int ret;
+
+	mutex_lock(&trigger_data->mutex);
+
+	if (!trigger_data->ttyname) {
+		/* exit without rescheduling */
+		mutex_unlock(&trigger_data->mutex);
+		return;
+	}
+
+	/* try to get the tty corresponding to $ttyname */
+	if (!trigger_data->tty) {
+		dev_t devno;
+		struct tty_struct *tty;
+		int ret;
+
+		ret = tty_dev_name_to_number(trigger_data->ttyname, &devno);
+		if (ret < 0)
+			/*
+			 * A device with this name might appear later, so keep
+			 * retrying.
+			 */
+			goto out;
+
+		tty = tty_kopen_shared(devno);
+		if (IS_ERR(tty) || !tty)
+			/* What to do? retry or abort */
+			goto out;
+
+		trigger_data->tty = tty;
+	}
+
+	ret = tty_get_icount(trigger_data->tty, &icount);
+	if (ret) {
+		dev_info(trigger_data->tty->dev, "Failed to get icount, stopped polling\n");
+		mutex_unlock(&trigger_data->mutex);
+		return;
+	}
+
+	if (icount.rx != trigger_data->rx ||
+	    icount.tx != trigger_data->tx) {
+		unsigned long interval = LEDTRIG_TTY_INTERVAL;
+
+		led_blink_set_oneshot(trigger_data->led_cdev, &interval,
+				      &interval, 0);
+
+		trigger_data->rx = icount.rx;
+		trigger_data->tx = icount.tx;
+	}
+
+out:
+	mutex_unlock(&trigger_data->mutex);
+	schedule_delayed_work(&trigger_data->dwork,
+			      msecs_to_jiffies(LEDTRIG_TTY_INTERVAL * 2));
+}
+
+static struct attribute *ledtrig_tty_attrs[] = {
+	&dev_attr_ttyname.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(ledtrig_tty);
+
+static int ledtrig_tty_activate(struct led_classdev *led_cdev)
+{
+	struct ledtrig_tty_data *trigger_data;
+
+	trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
+	if (!trigger_data)
+		return -ENOMEM;
+
+	led_set_trigger_data(led_cdev, trigger_data);
+
+	INIT_DELAYED_WORK(&trigger_data->dwork, ledtrig_tty_work);
+	trigger_data->led_cdev = led_cdev;
+	mutex_init(&trigger_data->mutex);
+
+	return 0;
+}
+
+static void ledtrig_tty_deactivate(struct led_classdev *led_cdev)
+{
+	struct ledtrig_tty_data *trigger_data = led_get_trigger_data(led_cdev);
+
+	cancel_delayed_work_sync(&trigger_data->dwork);
+
+	kfree(trigger_data->ttyname);
+	tty_kref_put(trigger_data->tty);
+	trigger_data->tty = NULL;
+
+	kfree(trigger_data);
+}
+
+static struct led_trigger ledtrig_tty = {
+	.name = "tty",
+	.activate = ledtrig_tty_activate,
+	.deactivate = ledtrig_tty_deactivate,
+	.groups = ledtrig_tty_groups,
+};
+module_led_trigger(ledtrig_tty);
+
+MODULE_AUTHOR("Uwe Kleine-König <u.kleine-koenig@pengutronix.de>");
+MODULE_DESCRIPTION("UART LED trigger");
+MODULE_LICENSE("GPL v2");