staging: comedi: ni_660x: remove ni660x_config_filter()

	return 0;

}

static void ni660x_config_filter(struct comedi_device *dev,

				 unsigned pfi_channel,

				 enum ni_gpct_filter_select filter)

{

	unsigned bits = ni_660x_read_register(dev, 0, IOConfigReg(pfi_channel));

	bits &= ~pfi_input_select_mask(pfi_channel);

	bits |= pfi_input_select_bits(pfi_channel, filter);

	ni_660x_write_register(dev, 0, bits, IOConfigReg(pfi_channel));

}

static int ni_660x_dio_insn_config(struct comedi_device *dev,

				   struct comedi_subdevice *s,

				   struct comedi_insn *insn, unsigned int *data)

{

	struct ni_660x_private *devpriv = dev->private;

	int chan = CR_CHAN(insn->chanspec);

	unsigned int val;

	/* The input or output configuration of each digital line is

	 * configured by a special insn_config instruction.  chanspec

		data[1] = devpriv->pfi_output_selects[chan];

		break;

	case INSN_CONFIG_FILTER:

		ni660x_config_filter(dev, chan, data[1]);

		val = ni_660x_read_register(dev, 0, IOConfigReg(chan));

		val &= ~pfi_input_select_mask(chan);

		val |= pfi_input_select_bits(chan, data[1]);

		ni_660x_write_register(dev, 0, val, IOConfigReg(chan));

		break;

	default:

		return -EINVAL;