ref: 2ce5f2b4ecfc37cbc032b5ea2102caa2de7bd6c6 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);