ref: 0060a4a2bc0d1554c8a04a15eb096e5a2bce4dcd 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);