ref: 83d5c827b7a9d3206be9d68a34e59e291e2c5143 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);