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leds: trigger: Introduce a kernel panic LED trigger

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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: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
This commit is contained in:
Ezequiel Garcia 2016-03-29 17:35:47 -03:00 committed by Jacek Anaszewski
parent f55532a0c0
commit 916fe61995
3 changed files with 38 additions and 0 deletions
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7
drivers/leds/trigger/Kconfig
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@ -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

1
drivers/leds/trigger/Makefile
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@ -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

30
drivers/leds/trigger/ledtrig-panic.c Normal file
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@ -0,0 +1,30 @@
/*
* 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);