#include <linux/init.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <mach/gpio.h>

MODULE_AUTHOR("Moritz Rosenthal");
MODULE_DESCRIPTION("This module does nothing useful");
MODULE_LICENSE("Dual BSD/GPL");

struct timer_list timer1;
unsigned char value;

void timer1_routine(unsigned long data)
{
    mod_timer(&timer1, jiffies + HZ); /* restarting timer */
    value ^= 0x01;
    gpio_set_value(110, value);
}

static int stm32f4_blink_init (void) {

    printk(KERN_ALERT "Starting blink module\n");
    value = 0;
    gpio_set_value(109, 1);
    
    /* initialize a timer */
    init_timer(&timer1);
    timer1.function = timer1_routine;
    timer1.data = 1;
    timer1.expires = jiffies + HZ; /* 1 second */
    add_timer(&timer1);

    return 0;
}

static void stm32f4_blink_exit (void) {
    printk(KERN_ALERT "No more blinking\n");
    del_timer_sync(&timer1); /* Deleting the timer */
    gpio_set_value(109, 0);
    gpio_set_value(110, 0);
}

module_init(stm32f4_blink_init);
module_exit(stm32f4_blink_exit);