[PATCH] LED: add LED trigger tupport
Add support for LED triggers to the LED subsystem. "Triggers" are events
which change the state of an LED. Two kinds of trigger are available, simple
ones which can be added to exising code with minimum disruption and complex
ones for implementing new or more complex functionality.
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/leds/leds.h b/drivers/leds/leds.h
index d26ca2f..a715c4e 100644
--- a/drivers/leds/leds.h
+++ b/drivers/leds/leds.h
@@ -28,4 +28,17 @@
extern rwlock_t leds_list_lock;
extern struct list_head leds_list;
+#ifdef CONFIG_LEDS_TRIGGERS
+void led_trigger_set_default(struct led_classdev *led_cdev);
+void led_trigger_set(struct led_classdev *led_cdev,
+ struct led_trigger *trigger);
+#else
+#define led_trigger_set_default(x) do {} while(0)
+#define led_trigger_set(x, y) do {} while(0)
+#endif
+
+ssize_t led_trigger_store(struct class_device *dev, const char *buf,
+ size_t count);
+ssize_t led_trigger_show(struct class_device *dev, char *buf);
+
#endif /* __LEDS_H_INCLUDED */