ref: 37f5a0e48ea1a65d4bed95f4e29a2ea9a3b81356 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);