leds: trigger: Add led_mc_trigger_event() function

Add a new led_mc_trigger_event() function for triggers which want to
change the color of a multi-color LED based on their trigger conditions.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/20240531114124.45346-6-hdegoede@redhat.comSigned-off-by: Lee Jones <lee@kernel.org>

drivers/leds/led-triggers.c

@@ -396,6 +396,26 @@ void led_trigger_event(struct led_trigger *trig,
 }
 EXPORT_SYMBOL_GPL(led_trigger_event);
 
+void led_mc_trigger_event(struct led_trigger *trig,
+			  unsigned int *intensity_value, unsigned int num_colors,
+			  enum led_brightness brightness)
+{
+	struct led_classdev *led_cdev;
+
+	if (!trig)
+		return;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(led_cdev, &trig->led_cdevs, trig_list) {
+		if (!(led_cdev->flags & LED_MULTI_COLOR))
+			continue;
+
+		led_mc_set_brightness(led_cdev, intensity_value, num_colors, brightness);
+	}
+	rcu_read_unlock();
+}
+EXPORT_SYMBOL_GPL(led_mc_trigger_event);
+
 static void led_trigger_blink_setup(struct led_trigger *trig,
 			     unsigned long delay_on,
 			     unsigned long delay_off,

include/linux/leds.h

@@ -510,6 +510,9 @@ void led_trigger_register_simple(const char *name,
 				struct led_trigger **trigger);
 void led_trigger_unregister_simple(struct led_trigger *trigger);
 void led_trigger_event(struct led_trigger *trigger,  enum led_brightness event);
+void led_mc_trigger_event(struct led_trigger *trig,
+			  unsigned int *intensity_value, unsigned int num_colors,
+			  enum led_brightness brightness);
 void led_trigger_blink(struct led_trigger *trigger, unsigned long delay_on,
 		       unsigned long delay_off);
 void led_trigger_blink_oneshot(struct led_trigger *trigger,
@@ -552,6 +555,9 @@ static inline void led_trigger_register_simple(const char *name,
 static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {}
 static inline void led_trigger_event(struct led_trigger *trigger,
 				enum led_brightness event) {}
+static inline void led_mc_trigger_event(struct led_trigger *trig,
+				unsigned int *intensity_value, unsigned int num_colors,
+				enum led_brightness brightness) {}
 static inline void led_trigger_blink(struct led_trigger *trigger,
 				      unsigned long delay_on,
 				      unsigned long delay_off) {}