ref: 2f6c3ee3bcdfd540eb0d0bf8ce90a2a97e1f3850 dir: /sys/src/cmd/nusb/usbd/fns.h/
int attachdev(Port*); void detachdev(Port*); void work(void); Hub* newhub(char *, Dev*); int hname(char *); void checkidle(void);