ref: a2eddf4d2d3e9ed1bd1ee2edf46d4737d8504dd2 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);