NI660X_IO_CFG
bits = ni_660x_read(dev, idle_chip, NI660X_IO_CFG(chan));
ni_660x_write(dev, idle_chip, bits, NI660X_IO_CFG(chan));
bits = ni_660x_read(dev, active_chip, NI660X_IO_CFG(chan));
ni_660x_write(dev, active_chip, bits, NI660X_IO_CFG(chan));
val = ni_660x_read(dev, 0, NI660X_IO_CFG(chan));
ni_660x_write(dev, 0, val, NI660X_IO_CFG(chan));
ni_660x_write(dev, chip, 0, NI660X_IO_CFG(chan));