ref: ca2fa9596b5d0d893be28c6e8fd8a52a89a0c3c6 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);