Programming

int pciport_init(void)
{
    int result;
    /* Registering device */
    result = register_chrdev(pciport_major, "pciport",  &pciport_fops);
    if (result < 0) { printk("<1>pciport: cannot obtain major number %d\n",pciport_major); return result; }

    //<pciport modified init module>
    /* Registering port */
  
    port = request_region(0xCF8, 4, "pciport");
    if (!port) {    printk("<1>pciport: cannot reserve 0xCF8\n");    result = port;    goto fail;    }

    printk("<1>Inserting pciport module\n");
    return 0;

    fail:
    pciport_exit();
    return result;
}