ref: e3f5a83c3e1c8c7757eaf77ba50dae2ad0ff2ca1 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);