ref: 33bdd7e6c2bbfc7e2373b4e8d0371fd89dc31e52 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);