ref: 0e8db6d34eea3f58ea6ca3bfedcb2e004c4d74dd 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);