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Commit 916fe619 authored by Ezequiel Garcia's avatar Ezequiel Garcia Committed by Jacek Anaszewski
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leds: trigger: Introduce a kernel panic LED trigger 



This commit introduces a new LED trigger which allows to configure
a LED to blink on a kernel panic (through panic_blink).

Notice that currently the Openmoko FreeRunner (GTA02) mach code
sets panic_blink to blink a hard-coded LED. The new trigger is
meant to introduce a generic mechanism to achieve this.

Signed-off-by: default avatarEzequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: default avatarJacek Anaszewski <j.anaszewski@samsung.com>
parent f55532a0

drivers/leds/trigger/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -108,4 +108,11 @@ config LEDS_TRIGGER_CAMERA 
	  This enables direct flash/torch on/off by the driver, kernel space.

	  If unsure, say Y.



config LEDS_TRIGGER_PANIC

	bool "LED Panic Trigger"

	depends on LEDS_TRIGGERS

	help

	  This allows LEDs to be configured to blink on a kernel panic.

	  If unsure, say Y.



endif # LEDS_TRIGGERS

drivers/leds/trigger/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -8,3 +8,4 @@ obj-$(CONFIG_LEDS_TRIGGER_CPU) += ledtrig-cpu.o 
obj-$(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

drivers/leds/trigger/ledtrig-panic.c

0 → 100644
+30 −0
Original line number Diff line number Diff line 
/*

 * Kernel Panic LED Trigger

 *

 * Copyright 2016 Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 */



#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/leds.h>



static struct led_trigger *trigger;



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)

{

	led_trigger_register_simple("panic", &trigger);

	panic_blink = led_panic_blink;

	return 0;

}

device_initcall(ledtrig_panic_init);