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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0 |
0cfbd328 MS |
2 | /* |
3 | * LED Triggers for USB Activity | |
4 | * | |
5 | * Copyright 2014 Michal Sojka <sojka@merica.cz> | |
0cfbd328 MS |
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 | ||
14 | #define BLINK_DELAY 30 | |
15 | ||
16 | static unsigned long usb_blink_delay = BLINK_DELAY; | |
17 | ||
18 | DEFINE_LED_TRIGGER(ledtrig_usb_gadget); | |
19 | DEFINE_LED_TRIGGER(ledtrig_usb_host); | |
20 | ||
21 | void usb_led_activity(enum usb_led_event ev) | |
22 | { | |
23 | struct led_trigger *trig = NULL; | |
24 | ||
25 | switch (ev) { | |
26 | case USB_LED_EVENT_GADGET: | |
27 | trig = ledtrig_usb_gadget; | |
28 | break; | |
29 | case USB_LED_EVENT_HOST: | |
30 | trig = ledtrig_usb_host; | |
31 | break; | |
32 | } | |
33 | /* led_trigger_blink_oneshot() handles trig == NULL gracefully */ | |
34 | led_trigger_blink_oneshot(trig, &usb_blink_delay, &usb_blink_delay, 0); | |
35 | } | |
36 | EXPORT_SYMBOL_GPL(usb_led_activity); | |
37 | ||
38 | ||
39 | static int __init ledtrig_usb_init(void) | |
40 | { | |
41 | led_trigger_register_simple("usb-gadget", &ledtrig_usb_gadget); | |
42 | led_trigger_register_simple("usb-host", &ledtrig_usb_host); | |
43 | return 0; | |
44 | } | |
45 | ||
46 | static void __exit ledtrig_usb_exit(void) | |
47 | { | |
48 | led_trigger_unregister_simple(ledtrig_usb_gadget); | |
49 | led_trigger_unregister_simple(ledtrig_usb_host); | |
50 | } | |
51 | ||
52 | module_init(ledtrig_usb_init); | |
53 | module_exit(ledtrig_usb_exit); |