ref: e0745d0e8dcbb020e6b5debb46d8dcc24a1d6fc7 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);