//-------------------------------------------------------------------
//	mytimer.c
//
//	This module demonstrates the use of a dynamic kernel timer.  
//
//	programmer: ALLAN CRUSE
//	written on: 01 APR 2003
//-------------------------------------------------------------------

#define	__KERNEL__
#define	  MODULE  

#include <linux/module.h>	// for init_module() 
#include <linux/sched.h>	// for HZ, struct timer_list

#define	SUCCESS	0
#define SECONDS_COUNT 10

static char modname[] = "mytimer";	// module's name
static struct timer_list timer;		// kernel object
static unsigned up_seconds;		// my timer data

static void my_timer_function( unsigned long data )
{
	unsigned 	*mydata_ptr = (unsigned *)data; 

	*mydata_ptr += SECONDS_COUNT;
	printk( "<1>  my_timer_function:  " );
	printk( "uptime = %d seconds \n", up_seconds );
	mod_timer( &timer, jiffies + HZ * SECONDS_COUNT );
}

void cleanup_module( void )
{
	int	status = del_timer_sync( &timer );

	printk( "<1>Removing \'%s\' module\n", modname );
	printk( "<1>  status=%08X \n", status );
}

int init_module( void )
{
	printk( "<1>\nInstalling \'%s\' module\n", modname );

	// initialize our timer
	init_timer( &timer );

	// setup our timer's structure fields
	timer.expires = jiffies + HZ * SECONDS_COUNT;
	timer.data = (unsigned)&up_seconds;
	timer.function = my_timer_function;

	// add our timer to the kernel timer queue
	add_timer( &timer );
	return	SUCCESS;
}

MODULE_LICENSE("GPL");