// SPDX-License-Identifier: GPL-2.0/* * LED Triggers for USB Activity * * Copyright 2014 Michal Sojka <sojka@merica.cz> */ #include <linux/module.h>#include <linux/kernel.h>#include <linux/init.h>#include <linux/leds.h>#include <linux/usb.h>#include "common.h" #define BLINK_DELAY 30 DEFINE_LED_TRIGGER(ledtrig_usb_gadget);DEFINE_LED_TRIGGER(ledtrig_usb_host); void usb_led_activity(enum usb_led_event ev){	struct led_trigger *trig = NULL; 	switch (ev) {	case USB_LED_EVENT_GADGET:		trig = ledtrig_usb_gadget;		break;	case USB_LED_EVENT_HOST:		trig = ledtrig_usb_host;		break;	}	/* led_trigger_blink_oneshot() handles trig == NULL gracefully */	led_trigger_blink_oneshot(trig, BLINK_DELAY, BLINK_DELAY, 0);}EXPORT_SYMBOL_GPL(usb_led_activity);  void __init ledtrig_usb_init(void){	led_trigger_register_simple("usb-gadget", &ledtrig_usb_gadget);	led_trigger_register_simple("usb-host", &ledtrig_usb_host);} void __exit ledtrig_usb_exit(void){	led_trigger_unregister_simple(ledtrig_usb_gadget);	led_trigger_unregister_simple(ledtrig_usb_host);}