dnkbd_pollin
dat = dnkbd_pollin(sc, 10000);
static int dnkbd_pollin(struct dnkbd_softc *, u_int);
dat = dnkbd_pollin(sc, 10000);
if (dnkbd_pollin(sc, 10) == -1)
dat = dnkbd_pollin(sc, 10000);
dat = dnkbd_pollin(sc, 10000);