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
17static unsigned long usb_blink_delay = BLINK_DELAY;
18
19DEFINE_LED_TRIGGER(ledtrig_usb_gadget);
20DEFINE_LED_TRIGGER(ledtrig_usb_host);
21
22void 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}
37EXPORT_SYMBOL_GPL(usb_led_activity);
38
39
40void __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
46void __exit ledtrig_usb_exit(void)
47{
48	led_trigger_unregister_simple(ledtrig_usb_gadget);
49	led_trigger_unregister_simple(ledtrig_usb_host);
50}