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0cfbd328 MS |
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 | ||
20 | static unsigned long usb_blink_delay = BLINK_DELAY; | |
21 | ||
22 | DEFINE_LED_TRIGGER(ledtrig_usb_gadget); | |
23 | DEFINE_LED_TRIGGER(ledtrig_usb_host); | |
24 | ||
25 | void 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 | } | |
40 | EXPORT_SYMBOL_GPL(usb_led_activity); | |
41 | ||
42 | ||
43 | static 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 | ||
50 | static 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 | ||
56 | module_init(ledtrig_usb_init); | |
57 | module_exit(ledtrig_usb_exit); |