static int gdm7213_probe(struct usb_interface *interface, const struct usb_device_id *id);
void gdm7213_disconnect (struct usb_interface *intf);

static struct usb_device_id gdm7213_table [] = {
{ USB_DEVICE(0x03f0,0×5307) },            //my flash drive vendor id ,product id.u can check it with ur device.
{ }
};

MODULE_DEVICE_TABLE(usb, gdm7213_table);

static struct usb_driver gdm7213_driver = {
.name                 = “lkm”,
.probe                = gdm7213_probe,
.disconnect           = gdm7213_disconnect,
//    .suspend              = gdm7213_suspend,
//    .resume               = gdm7213_resume,
//  .pre_reset            = gdm7213_pre_reset,
//    .post_reset           = gdm7213_post_reset,
.id_table             = gdm7213_table,
};

static int gdm7213_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
printk(KERN_INFO “GDM7213 gdm7213_probe()\n”);
return 0;
}
void gdm7213_disconnect (struct usb_interface *intf)
{
printk(KERN_INFO “GDM7213 gdm7213_disconnect()\n”);

}

static int __init gdm7213_init_module(void)
{
int result;
printk(KERN_INFO “GDM7213 init_module()\n”);

result = usb_register(&gdm7213_driver);
if (result)
err(“usb_register failed. Error number %d”, result);
else
printk(KERN_INFO “usb registerd\n”);
return result;
}

static void __exit gdm7213_cleanup_module(void)
{
printk(KERN_INFO “GDM7213 cleanup_module()\n”);
usb_deregister(&gdm7213_driver);
}

module_init(gdm7213_init_module);
module_exit(gdm7213_cleanup_module);

ptr=&a;

printf(“%p”,ptr);

is it prints the physical address of ram or logical??

and please tell me , parallel port and serial port which memory mapping followed??

compatibility: sends one byte data on data port line and take the output by leds,

nibble mode: sends data on upper 4bits of the data port and receive by the upper bits of the status register . and control register used for controling the receiver device.so it take two clock to send one byte of data.

byte mode : sends one byte data and receive one byte data by the data register in single clock.

but my problem is these all modes performing  simplex communication unidirectional , i want to make it half duplex if it is possible, please tell me its very humble request to u.