ref: e51c4bc6e493a9cd0d9e9d7f1d24c57ae77bab65 dir: /sys/src/cmd/nusb/usbd/fns.h/
int attachdev(Port*); void detachdev(Port*); void work(void); Hub* newhub(char *, Dev*); int hname(char *); void checkidle(void);