1 // SPDX-License-Identifier: GPL-2.0-only
3  * Backlight emulation LED trigger
21 	struct led_classdev *led;  member
33 	struct led_classdev *led = n->led;  in fb_notifier_callback()  local
42 	blank = fb_event->data;  in fb_notifier_callback()
45 	if (new_status == n->old_status)  in fb_notifier_callback()
48 	if ((n->old_status == UNBLANK) ^ n->invert) {  in fb_notifier_callback()
49 		n->brightness = led->brightness;  in fb_notifier_callback()
50 		led_set_brightness_nosleep(led, LED_OFF);  in fb_notifier_callback()
52 		led_set_brightness_nosleep(led, n->brightness);  in fb_notifier_callback()
55 	n->old_status = new_status;  in fb_notifier_callback()
65 	return sprintf(buf, "%u\n", n->invert);  in bl_trig_invert_show()
71 	struct led_classdev *led = led_trigger_get_led(dev);  in bl_trig_invert_store()  local
81 		return -EINVAL;  in bl_trig_invert_store()
83 	n->invert = invert;  in bl_trig_invert_store()
85 	/* After inverting, we need to update the LED. */  in bl_trig_invert_store()
86 	if ((n->old_status == BLANK) ^ n->invert)  in bl_trig_invert_store()
87 		led_set_brightness_nosleep(led, LED_OFF);  in bl_trig_invert_store()
89 		led_set_brightness_nosleep(led, n->brightness);  in bl_trig_invert_store()
101 static int bl_trig_activate(struct led_classdev *led)  in bl_trig_activate()  argument
109 		return -ENOMEM;  in bl_trig_activate()
110 	led_set_trigger_data(led, n);  in bl_trig_activate()
112 	n->led = led;  in bl_trig_activate()
113 	n->brightness = led->brightness;  in bl_trig_activate()
114 	n->old_status = UNBLANK;  in bl_trig_activate()
115 	n->notifier.notifier_call = fb_notifier_callback;  in bl_trig_activate()
117 	ret = fb_register_client(&n->notifier);  in bl_trig_activate()
119 		dev_err(led->dev, "unable to register backlight trigger\n");  in bl_trig_activate()
124 static void bl_trig_deactivate(struct led_classdev *led)  in bl_trig_deactivate()  argument
126 	struct bl_trig_notifier *n = led_get_trigger_data(led);  in bl_trig_deactivate()
128 	fb_unregister_client(&n->notifier);  in bl_trig_deactivate()
133 	.name		= "backlight",
141 MODULE_DESCRIPTION("Backlight emulation LED trigger");