to_gameport_driver
error = gameport_bind_driver(gameport, to_gameport_driver(drv));
struct gameport_driver *driver = to_gameport_driver(drv);
struct gameport_driver *drv = to_gameport_driver(dev->driver);
struct gameport_driver *drv = to_gameport_driver(dev->driver);
const struct gameport_driver *gameport_drv = to_gameport_driver(drv);