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-rw-r--r--include/linux/leds.h47
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
*/