As per commit 916fe619951f ("leds: trigger: Introduce a kernel
panic LED trigger"), the kernel now supports a new LED trigger
to hook on the panic blink.
However, the only way of using this is to dedicate a LED device,
making it rather useless.
To overcome this limitation, the present series introduces the
capability to switch the LED trigger of certain LED devices upon
a kernel panic (using the panic notifier).
The decision of which LEDs should be switched to the panic trigger
is left to each LED device driver. As an example, a devicetree
boolean property is introduced and used in the leds-gpio driver.
The big change in this v3 is that I've moved the panic trigger
switching away from the core code and it's now part of
ledtrig-panic.c. Pavel, Jacek: How does it look?
Changes from v2:
* Added Rob's "panic-indicator" devicetree property Acked-by.
* Fix typo, as pointed out by Robin Murphy.
* Documented "panic-indicator" in bindings/leds/leds-gpio.txt.
* Moved the panic trigger switching from the trigger core code,
to ledtrig-panic.c.
Changes from v1:
* Dropped the led_trigger_event_nosleep API, and instead just
clear the blink_delay_{on, off} when the panic is notified.
This results in less changes.
* Changed the flag to LED_PANIC_INDICATOR, as requested by Jacek.
* Changed the firmware property name to "panic-indicator", as
requested by Jacek.
Ezequiel Garcia (3):
leds: triggers: Allow to switch the trigger to "panic" on a kernel
panic
devicetree: leds: Introduce "panic-indicator" optional property
leds: gpio: Support the "panic-indicator" firmware property
Documentation/devicetree/bindings/leds/common.txt | 3 ++
.../devicetree/bindings/leds/leds-gpio.txt | 2 +
drivers/leds/led-triggers.c | 2 +-
drivers/leds/leds-gpio.c | 4 ++
drivers/leds/leds.h | 1 +
drivers/leds/trigger/Kconfig | 3 ++
drivers/leds/trigger/ledtrig-panic.c | 47 ++++++++++++++++++++++
include/linux/leds.h | 2 +
8 files changed, 63 insertions(+), 1 deletion(-)
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2.7.0
