leds: Add backlight LED trigger

This allows LEDs to be controlled as a backlight device where
they turn off and on when the display is blanked and unblanked.
This is useful where you need various key backlight LEDs to
dim at the same time as the backlight.

Signed-off-by: Rodolfo Giometti <giometti@linux.it>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 14bb57b16593..2a72ce5c6d1f 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -200,6 +200,15 @@ config LEDS_TRIGGER_HEARTBEAT
           load average.
           If unsure, say Y.
 
+config LEDS_TRIGGER_BACKLIGHT
+        tristate "LED backlight Trigger"
+        depends on LEDS_TRIGGERS
+        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_DEFAULT_ON
         tristate "LED Default ON Trigger"
         depends on LEDS_TRIGGERS