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 21static void ledtrig_ide_timerfunc(unsigned long data); 22 23DEFINE_LED_TRIGGER(ledtrig_ide); 24static DEFINE_TIMER(ledtrig_ide_timer, ledtrig_ide_timerfunc, 0, 0); 25static int ide_activity; 26static int ide_lastactivity; 27 28void 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} 34EXPORT_SYMBOL(ledtrig_ide_activity); 35 36static 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 48static int __init ledtrig_ide_init(void) 49{ 50 led_trigger_register_simple("ide-disk", &ledtrig_ide); 51 return 0; 52} 53 54static void __exit ledtrig_ide_exit(void) 55{ 56 led_trigger_unregister_simple(ledtrig_ide); 57} 58 59module_init(ledtrig_ide_init); 60module_exit(ledtrig_ide_exit); 61 62MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>"); 63MODULE_DESCRIPTION("LED IDE Disk Activity Trigger"); 64MODULE_LICENSE("GPL"); 65