leds: allow led-drivers to use a variable range of brightness values

This patch allows drivers to override the default maximum brightness value
of 255.  We take care to preserve backwards-compatibility as much as
possible, so that user-space ABI doesn't change for existing drivers.
LED trigger code has also been updated to use the per-LED maximum.

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/leds.h b/include/linux/leds.h
index 24489da701e3..17d277e0c4a6 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -30,6 +30,7 @@ enum led_brightness {
 struct led_classdev {
         const char              *name;
         int                      brightness;
+        int                      max_brightness;
         int                      flags;
 
         /* Lower 16 bits reflect status */