w_dtr
#define w_dtr(x, y) (parport_write_data((x)->port, (y)))
#define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
#define w_dtr(x,y) outb(y, (x))
#define w_dtr(x,y) outb(y, (x))