| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * LED Triggers for USB Activity |
| * |
| * Copyright 2014 Michal Sojka <sojka@merica.cz> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| */ |
| |
| #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); |