ref: ef8cbbba03de2e3785a6170e9e7c4f6ca5f4aa78 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);