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staging: comedi: adl_pci6208: cleanup pci6208_ao_winsn()

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Use the defines for the register map to make the code a bit
clearer. Shorten or rename some of the local variables for
the same reason.

Only the last value written to the DAC needs to be cached in
the ao_readback variable.

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 2012-06-27 15:06:14 -07:00 committed by Greg Kroah-Hartman
parent 5c67df8b98
commit 8366404bf1
1 changed files with 14 additions and 11 deletions
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25
drivers/staging/comedi/drivers/adl_pci6208.c
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@ -82,21 +82,24 @@ static int pci6208_ao_winsn(struct comedi_device *dev,
struct comedi_insn *insn, unsigned int *data)
{
struct pci6208_private *devpriv = dev->private;
int i = 0, Data_Read;
unsigned short chan = CR_CHAN(insn->chanspec);
int chan = CR_CHAN(insn->chanspec);
unsigned long invert = 1 << (16 - 1);
unsigned long out_value;
unsigned long value = 0;
unsigned short status;
int i;
for (i = 0; i < insn->n; i++) {
out_value = data[i] ^ invert;
do {
Data_Read = (inw(dev->iobase) & 1);
} while (Data_Read);
outw(out_value, dev->iobase + (0x02 * chan));
devpriv->ao_readback[chan] = out_value;
}
value = data[i] ^ invert;
return i;
do {
status = inw(dev->iobase + PCI6208_AO_STATUS);
} while (status & PCI6208_AO_STATUS_DATA_SEND);
outw(value, dev->iobase + PCI6208_AO_CONTROL(chan));
}
devpriv->ao_readback[chan] = value;
return insn->n;
}
static int pci6208_ao_rinsn(struct comedi_device *dev,