ref: 85ffa283f67b4bd139a4e28e82f0d1c7f6c53b3b 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);