ref: bb2d2dd61e52e60a20bbd8b6fccfff4d5b80b620 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);