ref: 0faa8ef93d0527d4e87467f6439aa3c5cd6d4e4d 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);