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 | |
17 | DEFINE_LED_TRIGGER(ledtrig_usb_gadget); |
18 | DEFINE_LED_TRIGGER(ledtrig_usb_host); |
19 | |
20 | void usb_led_activity(enum usb_led_event ev) |
21 | { |
22 | struct led_trigger *trig = NULL; |
23 | |
24 | switch (ev) { |
25 | case USB_LED_EVENT_GADGET: |
26 | trig = ledtrig_usb_gadget; |
27 | break; |
28 | case USB_LED_EVENT_HOST: |
29 | trig = ledtrig_usb_host; |
30 | break; |
31 | } |
32 | /* led_trigger_blink_oneshot() handles trig == NULL gracefully */ |
33 | led_trigger_blink_oneshot(trigger: trig, BLINK_DELAY, BLINK_DELAY, invert: 0); |
34 | } |
35 | EXPORT_SYMBOL_GPL(usb_led_activity); |
36 | |
37 | |
38 | void __init ledtrig_usb_init(void) |
39 | { |
40 | led_trigger_register_simple(name: "usb-gadget", trigger: &ledtrig_usb_gadget); |
41 | led_trigger_register_simple(name: "usb-host", trigger: &ledtrig_usb_host); |
42 | } |
43 | |
44 | void __exit ledtrig_usb_exit(void) |
45 | { |
46 | led_trigger_unregister_simple(trigger: ledtrig_usb_gadget); |
47 | led_trigger_unregister_simple(trigger: ledtrig_usb_host); |
48 | } |
49 |