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| author |   Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> | 2016-03-29 17:35:47 -0300 |
|---|---|---|
| committer |   Jacek Anaszewski <j.anaszewski@samsung.com> | 2016-03-30 11:16:39 +0200 |
| commit | 916fe619951f41b55d4f2b9f26d64ad981bc0dfa (patch) | |
| tree | f2adcab47354d000d4851274caf136ad98851830 /drivers/leds | |
| parent | Linux 4.6-rc1 (diff) | |
| download | linux-dev-916fe619951f41b55d4f2b9f26d64ad981bc0dfa.tar.xz linux-dev-916fe619951f41b55d4f2b9f26d64ad981bc0dfa.zip | |
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: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/trigger/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/leds/trigger/Makefile | 1 | ||||
| -rw-r--r-- | drivers/leds/trigger/ledtrig-panic.c | 30 |
3 files changed, 38 insertions, 0 deletions
diff --git a/drivers/leds/trigger/Kconfig b/drivers/leds/trigger/Kconfig index 5bda6a9b56bb..554f5bfbeced 100644 --- a/drivers/leds/trigger/Kconfig +++ b/drivers/leds/trigger/Kconfig @@ -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 diff --git a/drivers/leds/trigger/Makefile b/drivers/leds/trigger/Makefile index 1abf48dacf7e..547bf5c80e52 100644 --- a/drivers/leds/trigger/Makefile +++ b/drivers/leds/trigger/Makefile @@ -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 diff --git a/drivers/leds/trigger/ledtrig-panic.c b/drivers/leds/trigger/ledtrig-panic.c new file mode 100644 index 000000000000..627b350c5ec3 --- /dev/null +++ b/drivers/leds/trigger/ledtrig-panic.c @@ -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); |