#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/uaccess.h>

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("hello world module");

#define FILENAME "fortytwo"

ssize_t dev_read(struct file *f, char __user *buf, size_t len, loff_t *off);
ssize_t dev_write(struct file *f, const char __user *buf, size_t len, loff_t *off);

static const struct file_operations fops = {
    .owner = THIS_MODULE,
    .read = dev_read,
    .write = dev_write,
};

static struct miscdevice dev = {
    .minor = MISC_DYNAMIC_MINOR,
    .name = FILENAME,
    .fops = &fops,
    .mode = 0666,
};

static int __init fortytwo_init(void) 
{ 
	pr_info("creating fortytwo misc device\n");
	return misc_register(&dev);
} 

static void __exit fortytwo_exit(void) 
{ 
	pr_info("removing forytwo misc device\n"); 
	misc_deregister(&dev);
} 

module_init(fortytwo_init); 
module_exit(fortytwo_exit);