leds: Add support for hardware accelerated LED flashing

Extends the leds subsystem with a blink_set() callback function which can
be optionally implemented by a LED driver. If implemented, the driver can use
the hardware acceleration for blinking a LED.

Signed-off-by: Márton Németh <nm127@freemail.hu>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/leds.h b/include/linux/leds.h
index 00f89fd6c52a..0201f6f51cea 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -38,6 +38,11 @@ struct led_classdev {
         void            (*brightness_set)(struct led_classdev *led_cdev,
                                           enum led_brightness brightness);
 
+        /* Activate hardware accelerated blink */
+        int             (*blink_set)(struct led_classdev *led_cdev,
+                                     unsigned long *delay_on,
+                                     unsigned long *delay_off);
+
         struct device           *dev;
         struct list_head         node;                  /* LED Device list */
         char                    *default_trigger;       /* Trigger to use */