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57 lines
1.3 KiB
57 lines
1.3 KiB
/* |
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* LED Triggers for USB Activity |
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* |
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* Copyright 2014 Michal Sojka <sojka@merica.cz> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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* |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/leds.h> |
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#include <linux/usb.h> |
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#define BLINK_DELAY 30 |
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static unsigned long usb_blink_delay = BLINK_DELAY; |
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DEFINE_LED_TRIGGER(ledtrig_usb_gadget); |
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DEFINE_LED_TRIGGER(ledtrig_usb_host); |
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void usb_led_activity(enum usb_led_event ev) |
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{ |
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struct led_trigger *trig = NULL; |
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switch (ev) { |
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case USB_LED_EVENT_GADGET: |
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trig = ledtrig_usb_gadget; |
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break; |
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case USB_LED_EVENT_HOST: |
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trig = ledtrig_usb_host; |
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break; |
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} |
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/* led_trigger_blink_oneshot() handles trig == NULL gracefully */ |
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led_trigger_blink_oneshot(trig, &usb_blink_delay, &usb_blink_delay, 0); |
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} |
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EXPORT_SYMBOL_GPL(usb_led_activity); |
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static int __init ledtrig_usb_init(void) |
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{ |
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led_trigger_register_simple("usb-gadget", &ledtrig_usb_gadget); |
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led_trigger_register_simple("usb-host", &ledtrig_usb_host); |
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return 0; |
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} |
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static void __exit ledtrig_usb_exit(void) |
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{ |
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led_trigger_unregister_simple(ledtrig_usb_gadget); |
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led_trigger_unregister_simple(ledtrig_usb_host); |
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} |
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module_init(ledtrig_usb_init); |
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module_exit(ledtrig_usb_exit);
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