ref: 5b5f69513adcb9939e4ebd93bf8adfbfdc08fcf1 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);