ref: e9bb7876e1bd7f9aaef4e1cd0c64c97f411ffde5 dir: /sys/src/cmd/nusb/usbd/fns.h/
int attachdev(Port*); void detachdev(Port*); void work(void); Hub* newhub(char *, Dev*); int hname(char *); void checkidle(void);