// 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> #define BLINK_DELAY 30 static unsigned long usb_blink_delay = BLINK_DELAY; 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, &usb_blink_delay, &usb_blink_delay, 0); } EXPORT_SYMBOL_GPL(usb_led_activity); static int __init ledtrig_usb_init(void) { led_trigger_register_simple("usb-gadget", &ledtrig_usb_gadget); led_trigger_register_simple("usb-host", &ledtrig_usb_host); return 0; } static void __exit ledtrig_usb_exit(void) { led_trigger_unregister_simple(ledtrig_usb_gadget); led_trigger_unregister_simple(ledtrig_usb_host); } module_init(ledtrig_usb_init); module_exit(ledtrig_usb_exit);