#include <linux/atomic.h>
#include <linux/cdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/kernel.h> /* for sprintf() */
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/types.h>
#include"xpo_modul.h"

MODULE_AUTHOR("NIKOLA");
MODULE_DESCRIPTION("Simple kernel driver skeleton");
MODULE_LICENSE("GPL");


static int major;	// major number of device driver
#define DEVICE_NAME "xpo_modul"

static struct class *cls;

static int __init xpo_driver_init(void)
{
	pr_info("xpo: driver INIT\n");
	
	major = register_chrdev(0, DEVICE_NAME, &xpo_fops);

	if (major < 0) {
		pr_alert("xpo: registering char device failed with %d\n", major);
		return major;
	} else {
		pr_info("xpo: registering char device %d\n", major);
	}

	cls = class_create(THIS_MODULE, DEVICE_NAME);

    device_create(cls, NULL, MKDEV(major, 0), NULL, DEVICE_NAME);

    pr_info("xpo: Device created on /dev/%s\n", DEVICE_NAME);

	return 0;
}

static void xpo_driver_exit(void)
{
	pr_info("xpo: driver EXIT\n");

	device_destroy(cls, MKDEV(major, 0));

    class_destroy(cls);

	unregister_chrdev(major, DEVICE_NAME);
	
	return ;
}

module_init(xpo_driver_init);
module_exit(xpo_driver_exit);

// abcdefghijklmnopqrstuvwxyz

static unsigned char xpo_map[256] = 
{
	[0 ... 255] = 0,

	[2] = '1',
	[3] = '2',
	[4] = '3',
	[5] = '4',
	[6] = '5',
	[7] = '6',
	[8] = '7',
	[9] = '8',
	[10] = '9',
	[11] = '0',

	[16] = 'q',
	[17] = 'w',
	[18] = 'e',
	[19] = 'r',
	[20] = 't',
	[21] = 'z',
	[22] = 'u',
	[23] = 'i',
	[24] = 'o',
	[25] = 'p',

	[30] = 'a',
	[31] = 's',
	[32] = 'd',
	[33] = 'f',
	[34] = 'g',
	[35] = 'h',
	[36] = 'j',
	[37] = 'k',
	[37] = 'l',
	
	[44] = 'y',
	[45] = 'x',
	[46] = 'c',
	[47] = 'v',
	[48] = 'b',
	[49] = 'n',
	[50] = 'm'
};

ssize_t xpo_read(struct file *filep, char *buff, size_t count, loff_t *offp )
{
	unsigned char c = inb(0x60);	// 0x60 - which key down 
	char buf[20];
	sprintf(buf, "%u - znak: %c", c, xpo_map[c]);
	
	printk("xpo - signal: %s\n", buf);

	return 0;
}