gpiobus_pin_read
val = gpiobus_pin_read(&sc->gc, pin->pin_nr);
return gpiobus_pin_read(pd->pd_gc, pd->pd_pin);
op->gp_value = gpiobus_pin_read(gc, pin);
return gpiobus_pin_read(sc->sc_gc, map->pm_map[pin]);
req->gp_value = gpiobus_pin_read(gc, pin);
req->gp_value = gpiobus_pin_read(gc, pin);