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/kernel.h>
16 #include <linux/init.h>
17 #include <linux/timer.h>
18 #include <linux/leds.h>
19
20 static void ledtrig_ide_timerfunc(unsigned long data);
21
22 DEFINE_LED_TRIGGER(ledtrig_ide);
23 static DEFINE_TIMER(ledtrig_ide_timer, ledtrig_ide_timerfunc, 0, 0);
24 static int ide_activity;
25 static int ide_lastactivity;
26
27 void ledtrig_ide_activity(void)
28 {
29 ide_activity++;
30 if (!timer_pending(&ledtrig_ide_timer))
31 mod_timer(&ledtrig_ide_timer, jiffies + msecs_to_jiffies(10));
32 }
33 EXPORT_SYMBOL(ledtrig_ide_activity);
34
35 static void ledtrig_ide_timerfunc(unsigned long data)
36 {
37 if (ide_lastactivity != ide_activity) {
38 ide_lastactivity = ide_activity;
39 led_trigger_event(ledtrig_ide, LED_FULL);
40 mod_timer(&ledtrig_ide_timer, jiffies + msecs_to_jiffies(10));
41 } else {
42 led_trigger_event(ledtrig_ide, LED_OFF);
43 }
44 }
45
46 static int __init ledtrig_ide_init(void)
47 {
48 led_trigger_register_simple("ide-disk", &ledtrig_ide);
49 return 0;
50 }
51
52 static void __exit ledtrig_ide_exit(void)
53 {
54 led_trigger_unregister_simple(ledtrig_ide);
55 }
56
57 module_init(ledtrig_ide_init);
58 module_exit(ledtrig_ide_exit);
59
60 MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
61 MODULE_DESCRIPTION("LED IDE Disk Activity Trigger");
62 MODULE_LICENSE("GPL");
63
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