1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * LED Triggers for USB Activity 4 * 5 * Copyright 2014 Michal Sojka <sojka@merica.cz> 6 */ 7 8 #include <linux/module.h> 9 #include <linux/kernel.h> 10 #include <linux/init.h> 11 #include <linux/leds.h> 12 #include <linux/usb.h> 13 #include "common.h" 14 15 #define BLINK_DELAY 30 16 17 static unsigned long usb_blink_delay = BLINK_DELAY; 18 19 DEFINE_LED_TRIGGER(ledtrig_usb_gadget); 20 DEFINE_LED_TRIGGER(ledtrig_usb_host); 21 22 void usb_led_activity(enum usb_led_event ev) 23 { 24 struct led_trigger *trig = NULL; 25 26 switch (ev) { 27 case USB_LED_EVENT_GADGET: 28 trig = ledtrig_usb_gadget; 29 break; 30 case USB_LED_EVENT_HOST: 31 trig = ledtrig_usb_host; 32 break; 33 } 34 /* led_trigger_blink_oneshot() handles trig == NULL gracefully */ 35 led_trigger_blink_oneshot(trig, &usb_blink_delay, &usb_blink_delay, 0); 36 } 37 EXPORT_SYMBOL_GPL(usb_led_activity); 38 39 40 void __init ledtrig_usb_init(void) 41 { 42 led_trigger_register_simple("usb-gadget", &ledtrig_usb_gadget); 43 led_trigger_register_simple("usb-host", &ledtrig_usb_host); 44 } 45 46 void __exit ledtrig_usb_exit(void) 47 { 48 led_trigger_unregister_simple(ledtrig_usb_gadget); 49 led_trigger_unregister_simple(ledtrig_usb_host); 50 } 51