wskbd_cnpollc
cn_tab->cn_pollc = wskbd_cnpollc;
wskbd_cnpollc(dev,on);
wskbd_cnpollc(dev,on);
wsdisplay_set_cons_kbd(wskbd_cngetc, wskbd_cnpollc, wskbd_cnbell);
void wskbd_cnpollc(dev_t, int);