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  
usb_led_activity(enum usb_led_event ev)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(trig, BLINK_DELAY, BLINK_DELAY, 0);
34  }
35  EXPORT_SYMBOL_GPL(usb_led_activity);
36  
37  
ledtrig_usb_init(void)38  void __init ledtrig_usb_init(void)
39  {
40  	led_trigger_register_simple("usb-gadget", &ledtrig_usb_gadget);
41  	led_trigger_register_simple("usb-host", &ledtrig_usb_host);
42  }
43  
ledtrig_usb_exit(void)44  void __exit ledtrig_usb_exit(void)
45  {
46  	led_trigger_unregister_simple(ledtrig_usb_gadget);
47  	led_trigger_unregister_simple(ledtrig_usb_host);
48  }
49