1 // SPDX-License-Identifier: GPL-2.0
5 // Transient trigger allows one shot timer activation. Please refer to
6 // Documentation/leds/ledtrig-transient.rst for details
9 // Based on Richard Purdie's ledtrig-timer.c and Atsushi Nemoto's
10 // ledtrig-heartbeat.c
11 // Design and use-case input from Jonas Bonn <jonas@southpole.se> and
24 	int activate;  member
36 	struct led_classdev *led_cdev = transient_data->led_cdev;  in transient_timer_function()
38 	transient_data->activate = 0;  in transient_timer_function()
39 	led_set_brightness_nosleep(led_cdev, transient_data->restore_state);  in transient_timer_function()
48 	return sprintf(buf, "%d\n", transient_data->activate);  in transient_activate_show()
65 		return -EINVAL;  in transient_activate_store()
68 	if (state == 0 && transient_data->activate == 1) {  in transient_activate_store()
69 		del_timer(&transient_data->timer);  in transient_activate_store()
70 		transient_data->activate = state;  in transient_activate_store()
72 					transient_data->restore_state);  in transient_activate_store()
77 	if (state == 1 && transient_data->activate == 0 &&  in transient_activate_store()
78 	    transient_data->duration != 0) {  in transient_activate_store()
79 		transient_data->activate = state;  in transient_activate_store()
80 		led_set_brightness_nosleep(led_cdev, transient_data->state);  in transient_activate_store()
81 		transient_data->restore_state =  in transient_activate_store()
82 		    (transient_data->state == LED_FULL) ? LED_OFF : LED_FULL;  in transient_activate_store()
83 		mod_timer(&transient_data->timer,  in transient_activate_store()
84 			  jiffies + msecs_to_jiffies(transient_data->duration));  in transient_activate_store()
87 	/* state == 0 && transient_data->activate == 0  in transient_activate_store()
88 		timer is not active - just return */  in transient_activate_store()
89 	/* state == 1 && transient_data->activate == 1  in transient_activate_store()
90 		timer is already active - just return */  in transient_activate_store()
100 	return sprintf(buf, "%lu\n", transient_data->duration);  in transient_duration_show()
115 	transient_data->duration = state;  in transient_duration_store()
126 	state = (transient_data->state == LED_FULL) ? 1 : 0;  in transient_state_show()
143 		return -EINVAL;  in transient_state_store()
145 	transient_data->state = (state == 1) ? LED_FULL : LED_OFF;  in transient_state_store()
149 static DEVICE_ATTR(activate, 0644, transient_activate_show,
169 		return -ENOMEM;  in transient_trig_activate()
172 	tdata->led_cdev = led_cdev;  in transient_trig_activate()
174 	timer_setup(&tdata->timer, transient_timer_function, 0);  in transient_trig_activate()
183 	timer_shutdown_sync(&transient_data->timer);  in transient_trig_deactivate()
184 	led_set_brightness_nosleep(led_cdev, transient_data->restore_state);  in transient_trig_deactivate()
190 	.activate = transient_trig_activate,