ref: 5e9d8a7b18c001fd60d3c3978f90dcdaf20f5ce6 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);