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Commit 6dc125d2 authored by H Hartley Sweeten's avatar H Hartley Sweeten Committed by Greg Kroah-Hartman
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staging: comedi: rti800: save unmunged data for ao readback 



The unmunged data should be saved for readback not the munged data.

Signed-off-by: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: default avatarIan Abbott <abbotti@mev.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c2dfc3a5

drivers/staging/comedi/drivers/rti800.c

+4 −4
Original line number Diff line number Diff line
@@ -231,11 +231,13 @@ static int rti800_ao_insn_write(struct comedi_device *dev, 
	unsigned int chan = CR_CHAN(insn->chanspec);

	int reg_lo = chan ? RTI800_DAC1LO : RTI800_DAC0LO;

	int reg_hi = chan ? RTI800_DAC1HI : RTI800_DAC0HI;

	int val = devpriv->ao_readback[chan];

	int i;



	for (i = 0; i < insn->n; i++) {

		val = data[i];

		unsigned int val = data[i];



		devpriv->ao_readback[chan] = val;



		if (devpriv->dac_2comp[chan])

			val ^= 0x800;
@@ -243,8 +245,6 @@ static int rti800_ao_insn_write(struct comedi_device *dev, 
		outb((val >> 8) & 0xff, dev->iobase + reg_hi);

	}



	devpriv->ao_readback[chan] = val;



	return insn->n;

}