1 files changed, 43 insertions, 4 deletions

diff --git a/include/linux/leds.h b/include/linux/leds.h
index ba6986a11663..0f19df9e37b0 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -15,6 +15,7 @@
 #include <linux/list.h>
 #include <linux/spinlock.h>
 #include <linux/rwsem.h>
+#include <linux/timer.h>
 
 struct device;
 /*
@@ -45,10 +46,14 @@ struct led_classdev {
         /* Get LED brightness level */
         enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
 
-        /* Activate hardware accelerated blink, delays are in
-         * miliseconds and if none is provided then a sensible default
-         * should be chosen. The call can adjust the timings if it can't
-         * match the values specified exactly. */
+        /*
+         * Activate hardware accelerated blink, delays are in milliseconds
+         * and if both are zero then a sensible default should be chosen.
+         * The call should adjust the timings in that case and if it can't
+         * match the values specified exactly.
+         * Deactivate blinking again when the brightness is set to a fixed
+         * value via the brightness_set() callback.
+         */
         int             (*blink_set)(struct led_classdev *led_cdev,
                                      unsigned long *delay_on,
                                      unsigned long *delay_off);
@@ -57,6 +62,10 @@ struct led_classdev {
         struct list_head         node;                  /* LED Device list */
         const char              *default_trigger;       /* Trigger to use */
 
+        unsigned long            blink_delay_on, blink_delay_off;
+        struct timer_list        blink_timer;
+        int                      blink_brightness;
+
 #ifdef CONFIG_LEDS_TRIGGERS
         /* Protects the trigger data below */
         struct rw_semaphore      trigger_lock;
@@ -73,6 +82,36 @@ 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_blink_set - set blinking with software fallback
+ * @led_cdev: the LED to start blinking
+ * @delay_on: the time it should be on (in ms)
+ * @delay_off: the time it should ble off (in ms)
+ *
+ * This function makes the LED blink, attempting to use the
+ * hardware acceleration if possible, but falling back to
+ * software blinking if there is no hardware blinking or if
+ * the LED refuses the passed values.
+ *
+ * Note that if software blinking is active, simply calling
+ * led_cdev->brightness_set() will not stop the blinking,
+ * use led_classdev_brightness_set() instead.
+ */
+extern void led_blink_set(struct led_classdev *led_cdev,
+                          unsigned long *delay_on,
+                          unsigned long *delay_off);
+/**
+ * led_brightness_set - set LED brightness
+ * @led_cdev: the LED to set
+ * @brightness: the brightness to set it to
+ *
+ * Set an LED's brightness, and, if necessary, cancel the
+ * software blink timer that implements blinking when the
+ * hardware doesn't.
+ */
+extern void led_brightness_set(struct led_classdev *led_cdev,
+                               enum led_brightness brightness);
+
 /*
  * LED Triggers
  */