ref: 5ea63c61e0b4fba7d09edd5e471a7e7cd8e3da74 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);