1 // SPDX-License-Identifier: GPL-2.0-only
7  * Based on Richard Purdie's ledtrig-timer.c and some arch's
41 	led_cdev = heartbeat_data->led_cdev;  in led_heartbeat_function()
48 	if (test_and_clear_bit(LED_BLINK_BRIGHTNESS_CHANGE, &led_cdev->work_flags))  in led_heartbeat_function()
49 		led_cdev->blink_brightness = led_cdev->new_blink_brightness;  in led_heartbeat_function()
51 	/* acts like an actual heart beat -- ie thump-thump-pause... */  in led_heartbeat_function()
52 	switch (heartbeat_data->phase) {  in led_heartbeat_function()
58 		 * f(0)=1260, f(1)=860, f(5)=510, f(inf)->300.  in led_heartbeat_function()
60 		heartbeat_data->period = 300 +  in led_heartbeat_function()
62 		heartbeat_data->period =  in led_heartbeat_function()
63 			msecs_to_jiffies(heartbeat_data->period);  in led_heartbeat_function()
64 		delay = msecs_to_jiffies(70);  in led_heartbeat_function()
65 		heartbeat_data->phase++;  in led_heartbeat_function()
66 		if (!heartbeat_data->invert)  in led_heartbeat_function()
67 			brightness = led_cdev->blink_brightness;  in led_heartbeat_function()
70 		delay = heartbeat_data->period / 4 - msecs_to_jiffies(70);  in led_heartbeat_function()
71 		heartbeat_data->phase++;  in led_heartbeat_function()
72 		if (heartbeat_data->invert)  in led_heartbeat_function()
73 			brightness = led_cdev->blink_brightness;  in led_heartbeat_function()
76 		delay = msecs_to_jiffies(70);  in led_heartbeat_function()
77 		heartbeat_data->phase++;  in led_heartbeat_function()
78 		if (!heartbeat_data->invert)  in led_heartbeat_function()
79 			brightness = led_cdev->blink_brightness;  in led_heartbeat_function()
82 		delay = heartbeat_data->period - heartbeat_data->period / 4 -  in led_heartbeat_function()
83 			msecs_to_jiffies(70);  in led_heartbeat_function()
84 		heartbeat_data->phase = 0;  in led_heartbeat_function()
85 		if (heartbeat_data->invert)  in led_heartbeat_function()
86 			brightness = led_cdev->blink_brightness;  in led_heartbeat_function()
91 	mod_timer(&heartbeat_data->timer, jiffies + delay);  in led_heartbeat_function()
100 	return sprintf(buf, "%u\n", heartbeat_data->invert);  in led_invert_show()
115 	heartbeat_data->invert = !!state;  in led_invert_store()
134 		return -ENOMEM;  in heartbeat_trig_activate()
137 	heartbeat_data->led_cdev = led_cdev;  in heartbeat_trig_activate()
139 	timer_setup(&heartbeat_data->timer, led_heartbeat_function, 0);  in heartbeat_trig_activate()
140 	heartbeat_data->phase = 0;  in heartbeat_trig_activate()
141 	if (!led_cdev->blink_brightness)  in heartbeat_trig_activate()
142 		led_cdev->blink_brightness = led_cdev->max_brightness;  in heartbeat_trig_activate()
143 	led_heartbeat_function(&heartbeat_data->timer);  in heartbeat_trig_activate()
144 	set_bit(LED_BLINK_SW, &led_cdev->work_flags);  in heartbeat_trig_activate()
154 	timer_shutdown_sync(&heartbeat_data->timer);  in heartbeat_trig_deactivate()
156 	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);  in heartbeat_trig_deactivate()