#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/jiffies.h>

#include <linux/gpio.h>


MODULE_LICENSE("GPL");
MODULE_AUTHOR("c2plabs.com");
MODULE_DESCRIPTION("Module explains about Linux Kernel Timer");
MODULE_VERSION("1.21");

#define LED_PIN 23

void simple_timer_function(struct timer_list *);

struct timer_list simple_timer;

static int  __init simple_timer_module_init (void)
{

	timer_setup(&simple_timer,simple_timer_function,0);
	mod_timer(&simple_timer, jiffies + msecs_to_jiffies(500));
	gpio_direction_output(LED_PIN,1);
	return 0;
}


void simple_timer_function(struct timer_list *timer)
{

	static int count;

	printk(KERN_INFO" Timerfunction n");
	printk(KERN_INFO" HZ: %d n",HZ);
	mod_timer (&simple_timer, jiffies + ( msecs_to_jiffies(500)));
	if (count) {
	gpio_direction_output(LED_PIN,1);
	count = 0;
	}
	else {

	gpio_direction_output(LED_PIN,0);
	count = 1;
	}
	

}

static 	void __exit simple_timer_module_exit (void)
{
	del_timer(&simple_timer);
}

module_init(simple_timer_module_init);
module_exit(simple_timer_module_exit);