A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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staging: comedi: rti800: tidy up ai two's complement support

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The analog input on this board can return data as either two's
complement or straight binary data. The format is selected by a
jumper of the board and enabled by the user as option[4] when
attaching to the board.

Replace the adc_coding enum with a simple bool to indicate that
the data is returned in two's complement form.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2013-04-08 18:20:41 -07:00 • committed by Greg Kroah-Hartman
commit c7c1161dfd
1 changed files with 3 additions and 5 deletions
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8
drivers/staging/comedi/drivers/rti800.c
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@ -152,9 +152,7 @@ static const struct rti800_board rti800_boardtypes[] = {
};
struct rti800_private {
enum {
adc_2comp, adc_straight
} adc_coding;
bool adc_2comp;
bool dac_2comp[2];
const struct comedi_lrange *ao_range_type_list[2];
unsigned int ao_readback[2];
@ -221,7 +219,7 @@ static int rti800_ai_insn_read(struct comedi_device *dev,
data[i] = inb(dev->iobase + RTI800_ADCLO);
data[i] |= (0xf & inb(dev->iobase + RTI800_ADCHI)) << 8;
if (devpriv->adc_coding == adc_2comp)
if (devpriv->adc_2comp)
data[i] ^= 0x800;
}
@ -338,7 +336,7 @@ static int rti800_attach(struct comedi_device *dev, struct comedi_devconfig *it)
return -ENOMEM;
dev->private = devpriv;
devpriv->adc_coding = it->options[4];
devpriv->adc_2comp = (it->options[4] == 0);
devpriv->dac_2comp[0] = (it->options[6] == 0);
devpriv->dac_2comp[1] = (it->options[8] == 0);
/* invalid, forces the MUXGAIN register to be set when first used */