| Michal Sojka | 0cfbd32 | 2014-09-24 22:43:21 +0200 | [diff] [blame] | 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); |