ref: 0e96fd0197e0ce8d4e69cb1e0dc96dcfb4bb3a1e 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);