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 DEFINE_LED_TRIGGER(ledtrig_usb_gadget); 18 DEFINE_LED_TRIGGER(ledtrig_usb_host); 19 20 void usb_led_activity(enum usb_led_event ev) 21 { 22 struct led_trigger *trig = NULL; 23 24 switch (ev) { 25 case USB_LED_EVENT_GADGET: 26 trig = ledtrig_usb_gadget; 27 break; 28 case USB_LED_EVENT_HOST: 29 trig = ledtrig_usb_host; 30 break; 31 } 32 /* led_trigger_blink_oneshot() handles trig == NULL gracefully */ 33 led_trigger_blink_oneshot(trig, BLINK_DELAY, BLINK_DELAY, 0); 34 } 35 EXPORT_SYMBOL_GPL(usb_led_activity); 36 37 38 void __init ledtrig_usb_init(void) 39 { 40 led_trigger_register_simple("usb-gadget", &ledtrig_usb_gadget); 41 led_trigger_register_simple("usb-host", &ledtrig_usb_host); 42 } 43 44 void __exit ledtrig_usb_exit(void) 45 { 46 led_trigger_unregister_simple(ledtrig_usb_gadget); 47 led_trigger_unregister_simple(ledtrig_usb_host); 48 } 49