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staging: comedi: adl_pci9111: cleanup ai read in pci9111_ai_insn_read()

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The shift, maxdata, and invert values, used to handle the 12-/16-bit
analog input differences, can be calculated based on the subdevice
maxdata value.

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 2012-09-10 18:55:54 -07:00 • committed by Greg Kroah-Hartman
parent b5d8d11931
commit 2f002cc9b8
1 changed files with 7 additions and 12 deletions
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19
drivers/staging/comedi/drivers/adl_pci9111.c
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@ -966,10 +966,11 @@ static int pci9111_ai_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
int resolution =
((struct pci9111_board *)dev->board_ptr)->ai_resolution;
int timeout, i;
unsigned int maxdata = s->maxdata;
unsigned int invert = (maxdata + 1) >> 1;
unsigned int shift = (maxdata == 0xffff) ? 0 : 4;
int timeout;
int i;
pci9111_ai_channel_set(CR_CHAN((&insn->chanspec)[0]));
@ -995,14 +996,8 @@ static int pci9111_ai_insn_read(struct comedi_device *dev,
conversion_done:
if (resolution == PCI9111_HR_AI_RESOLUTION)
data[i] = (inw(dev->iobase + PCI9111_AI_FIFO_REG)
& PCI9111_HR_AI_RESOLUTION_MASK)
^ PCI9111_HR_AI_RESOLUTION_2_CMP_BIT;
else
data[i] = ((inw(dev->iobase + PCI9111_AI_FIFO_REG) >> 4)
& PCI9111_AI_RESOLUTION_MASK)
^ PCI9111_AI_RESOLUTION_2_CMP_BIT;
data[i] = inw(dev->iobase + PCI9111_AI_FIFO_REG);
data[i] = ((data[i] >> shift) & maxdata) ^ invert;
}
return i;