1 /*
2  * LED IDE-Disk Activity Trigger
3  *
4  * Copyright 2006 Openedhand Ltd.
5  *
6  * Author: Richard Purdie <rpurdie@openedhand.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  *
12  */
13 
14 #include <linux/module.h>
15 #include <linux/jiffies.h>
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/timer.h>
19 #include <linux/leds.h>
20 
21 static void ledtrig_ide_timerfunc(unsigned long data);
22 
23 DEFINE_LED_TRIGGER(ledtrig_ide);
24 static DEFINE_TIMER(ledtrig_ide_timer, ledtrig_ide_timerfunc, 0, 0);
25 static int ide_activity;
26 static int ide_lastactivity;
27 
ledtrig_ide_activity(void)28 void ledtrig_ide_activity(void)
29 {
30 	ide_activity++;
31 	if (!timer_pending(&ledtrig_ide_timer))
32 		mod_timer(&ledtrig_ide_timer, jiffies + msecs_to_jiffies(10));
33 }
34 EXPORT_SYMBOL(ledtrig_ide_activity);
35 
ledtrig_ide_timerfunc(unsigned long data)36 static void ledtrig_ide_timerfunc(unsigned long data)
37 {
38 	if (ide_lastactivity != ide_activity) {
39 		ide_lastactivity = ide_activity;
40 		/* INT_MAX will set each LED to its maximum brightness */
41 		led_trigger_event(ledtrig_ide, INT_MAX);
42 		mod_timer(&ledtrig_ide_timer, jiffies + msecs_to_jiffies(10));
43 	} else {
44 		led_trigger_event(ledtrig_ide, LED_OFF);
45 	}
46 }
47 
ledtrig_ide_init(void)48 static int __init ledtrig_ide_init(void)
49 {
50 	led_trigger_register_simple("ide-disk", &ledtrig_ide);
51 	return 0;
52 }
53 
ledtrig_ide_exit(void)54 static void __exit ledtrig_ide_exit(void)
55 {
56 	led_trigger_unregister_simple(ledtrig_ide);
57 }
58 
59 module_init(ledtrig_ide_init);
60 module_exit(ledtrig_ide_exit);
61 
62 MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
63 MODULE_DESCRIPTION("LED IDE Disk Activity Trigger");
64 MODULE_LICENSE("GPL");
65