AuxXxilium/linux_dsm_epyc7002
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staging: comedi: usbdux: clarify bipolar ai data

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Use the comedi_range_is_bipolar() helper instead of checking the
'range' index against a magic number.

Also, use the s->maxdata to calculate the value needed to munge the
value for bipolar data instead of the magic number.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2013-07-25 16:04:17 -07:00 committed by Greg Kroah-Hartman
parent a79b4cdb52
commit 91891f7cc6
1 changed files with 4 additions and 2 deletions
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6
drivers/staging/comedi/drivers/usbdux.c
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@ -1002,8 +1002,10 @@ static int usbdux_ai_insn_read(struct comedi_device *dev,
goto ai_read_exit;
val = le16_to_cpu(devpriv->insn_buffer[1]);
if (range <= 1)
val ^= 0x800;
/* bipolar data is two's-complement */
if (comedi_range_is_bipolar(s, range))
val ^= ((s->maxdata + 1) >> 1);
data[i] = val;
}