1/*
 2 * LED Triggers for USB Activity
 3 *
 4 * Copyright 2014 Michal Sojka <sojka@merica.cz>
 5 *
 6 * This program is free software; you can redistribute it and/or modify
 7 * it under the terms of the GNU General Public License version 2 as
 8 * published by the Free Software Foundation.
 9 *
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/leds.h>
16#include <linux/usb.h>
17
18#define BLINK_DELAY 30
19
20static unsigned long usb_blink_delay = BLINK_DELAY;
21
22DEFINE_LED_TRIGGER(ledtrig_usb_gadget);
23DEFINE_LED_TRIGGER(ledtrig_usb_host);
24
25void usb_led_activity(enum usb_led_event ev)
26{
27	struct led_trigger *trig = NULL;
28
29	switch (ev) {
30	case USB_LED_EVENT_GADGET:
31		trig = ledtrig_usb_gadget;
32		break;
33	case USB_LED_EVENT_HOST:
34		trig = ledtrig_usb_host;
35		break;
36	}
37	/* led_trigger_blink_oneshot() handles trig == NULL gracefully */
38	led_trigger_blink_oneshot(trig, &usb_blink_delay, &usb_blink_delay, 0);
39}
40EXPORT_SYMBOL_GPL(usb_led_activity);
41
42
43static int __init ledtrig_usb_init(void)
44{
45	led_trigger_register_simple("usb-gadget", &ledtrig_usb_gadget);
46	led_trigger_register_simple("usb-host", &ledtrig_usb_host);
47	return 0;
48}
49
50static void __exit ledtrig_usb_exit(void)
51{
52	led_trigger_unregister_simple(ledtrig_usb_gadget);
53	led_trigger_unregister_simple(ledtrig_usb_host);
54}
55
56module_init(ledtrig_usb_init);
57module_exit(ledtrig_usb_exit);