1 files changed, 52 insertions, 0 deletions

diff --git a/include/linux/leds.h b/include/linux/leds.h
index 6812640b39cc..404575c3dd5a 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -40,6 +40,14 @@ struct led_classdev {
 
         /* Trigger data */
         char *default_trigger;
+#ifdef CONFIG_LEDS_TRIGGERS
+        rwlock_t trigger_lock;
+        /* Protects the trigger data below */
+
+        struct led_trigger *trigger;
+        struct list_head trig_list;
+        void *trigger_data;
+#endif
 };
 
 extern int led_classdev_register(struct device *parent,
@@ -48,4 +56,48 @@ extern void led_classdev_unregister(struct led_classdev *led_cdev);
 extern void led_classdev_suspend(struct led_classdev *led_cdev);
 extern void led_classdev_resume(struct led_classdev *led_cdev);
 
+/*
+ * LED Triggers
+ */
+#ifdef CONFIG_LEDS_TRIGGERS
+
+#define TRIG_NAME_MAX 50
+
+struct led_trigger {
+        /* Trigger Properties */
+        const char *name;
+        void (*activate)(struct led_classdev *led_cdev);
+        void (*deactivate)(struct led_classdev *led_cdev);
+
+        /* LEDs under control by this trigger (for simple triggers) */
+        rwlock_t leddev_list_lock;
+        struct list_head led_cdevs;
+
+        /* Link to next registered trigger */
+        struct list_head next_trig;
+};
+
+/* Registration functions for complex triggers */
+extern int led_trigger_register(struct led_trigger *trigger);
+extern void led_trigger_unregister(struct led_trigger *trigger);
+
+/* Registration functions for simple triggers */
+#define DEFINE_LED_TRIGGER(x)           static struct led_trigger *x;
+#define DEFINE_LED_TRIGGER_GLOBAL(x)    struct led_trigger *x;
+extern void led_trigger_register_simple(const char *name,
+                                struct led_trigger **trigger);
+extern void led_trigger_unregister_simple(struct led_trigger *trigger);
+extern void led_trigger_event(struct led_trigger *trigger,
+                                enum led_brightness event);
+
+#else
+
+/* Triggers aren't active - null macros */
+#define DEFINE_LED_TRIGGER(x)
+#define DEFINE_LED_TRIGGER_GLOBAL(x)
+#define led_trigger_register_simple(x, y) do {} while(0)
+#define led_trigger_unregister_simple(x) do {} while(0)
+#define led_trigger_event(x, y) do {} while(0)
+
+#endif
 #endif          /* __LINUX_LEDS_H_INCLUDED */