leds: triggers: add support for RGB triggers

index 2181581..f01d6c0 100644
@@ -30,6 +30,13 @@ static LIST_HEAD(trigger_list);
 
  /* Used by LED Class */
 
+static inline bool led_trigger_is_supported(struct led_trigger *trig,
+					    struct led_classdev *led_cdev)
+{
+	return !(trig->flags & LED_TRIG_CAP_RGB) ||
+	       led_cdev->flags & LED_DEV_CAP_RGB;
+}
+
 ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
 		const char *buf, size_t count)
 {

@@ -52,6 +59,8 @@ ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
 	down_read(&triggers_list_lock);
 	list_for_each_entry(trig, &trigger_list, next_trig) {
 		if (sysfs_streq(buf, trig->name)) {
+			if (!led_trigger_is_supported(trig, led_cdev))
+				break;
 			down_write(&led_cdev->trigger_lock);
 			led_trigger_set(led_cdev, trig);
 			up_write(&led_cdev->trigger_lock);

@@ -84,6 +93,8 @@ ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
 		len += sprintf(buf+len, "none ");
 
 	list_for_each_entry(trig, &trigger_list, next_trig) {
+		if (!led_trigger_is_supported(trig, led_cdev))
+			continue;
 		if (led_cdev->trigger && !strcmp(led_cdev->trigger->name,
 							trig->name))
 			len += sprintf(buf+len, "[%s] ", trig->name);

index 58e22e6..07eb074 100644
@@ -248,6 +248,9 @@ enum led_brightness led_hsv_to_rgb(enum led_brightness hsv);
 struct led_trigger {
 	/* Trigger Properties */
 	const char	 *name;
+	u8		flags;
+#define LED_TRIG_CAP_RGB	BIT(0)
+
 	void		(*activate)(struct led_classdev *led_cdev);
 	void		(*deactivate)(struct led_classdev *led_cdev);