HUBD_IS_ROOT_HUB
getminor(dev) & ~HUBD_IS_ROOT_HUB);
inst = getminor(dev) & ~HUBD_IS_ROOT_HUB;
int instance = getminor(dev) & ~HUBD_IS_ROOT_HUB;
int instance = (int)minor & ~HUBD_IS_ROOT_HUB;
minor = HUBD_IS_ROOT_HUB;
#define EHCI_UNIT(dev) (getminor((dev)) & ~HUBD_IS_ROOT_HUB)
#define OHCI_UNIT(dev) (getminor((dev)) & ~HUBD_IS_ROOT_HUB)
#define UHCI_UNIT(dev) (getminor((dev)) & ~HUBD_IS_ROOT_HUB)