ref: 2b5dfee06cc6a7b915d6b7fe7cfe2942a660cde0 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);