PORT_GPIO_DIR
{ PORT_GPIO_DIR, 2 },
data = bus_space_read_2(ess->st, ess->sh, PORT_GPIO_DIR);
bus_space_write_2(ess->st, ess->sh, PORT_GPIO_DIR,
bus_space_write_2(ess->st, ess->sh, PORT_GPIO_DIR, data);
bus_space_write_2(ess->st, ess->sh, PORT_GPIO_DIR,
bus_space_read_2(ess->st, ess->sh, PORT_GPIO_DIR) |