ref: 7f6f91cb5d76b5424e4a4ac1d9c82b57d032fe47 dir: /sys/src/cmd/nusb/usbd/fns.h/
int attachdev(Port*); void detachdev(Port*); void work(void); Hub* newhub(char *, Dev*); void hname(char *); void checkidle(void);