The comedi core validates the insn->chanspec and data values before
calling the (*insn_write) functions. The 'chan' will always be valid.
Tidy up this function up a bit and remove the unnecessary code.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/ni_atmio16d.c | 40 +++++++++++++---------------
1 file changed, 19 insertions(+), 21 deletions(-)
diff --git a/drivers/staging/comedi/drivers/ni_atmio16d.c
b/drivers/staging/comedi/drivers/ni_atmio16d.c
index f1acca6..ed271ca 100644
--- a/drivers/staging/comedi/drivers/ni_atmio16d.c
+++ b/drivers/staging/comedi/drivers/ni_atmio16d.c
@@ -510,34 +510,32 @@ static int atmio16d_ao_insn_read(struct comedi_device
*dev,
static int atmio16d_ao_insn_write(struct comedi_device *dev,
struct comedi_subdevice *s,
- struct comedi_insn *insn, unsigned int *data)
+ struct comedi_insn *insn,
+ unsigned int *data)
{
struct atmio16d_private *devpriv = dev->private;
+ unsigned int chan = CR_CHAN(insn->chanspec);
+ unsigned int reg = (chan) ? DAC1_REG : DAC0_REG;
+ bool munge = false;
int i;
- int chan;
- int d;
- chan = CR_CHAN(insn->chanspec);
+ if (chan == 0 && devpriv->dac0_coding == dac_2comp)
+ munge = true;
+ if (chan == 1 && devpriv->dac1_coding == dac_2comp)
+ munge = true;
for (i = 0; i < insn->n; i++) {
- d = data[i];
- switch (chan) {
- case 0:
- if (devpriv->dac0_coding == dac_2comp)
- d ^= 0x800;
- outw(d, dev->iobase + DAC0_REG);
- break;
- case 1:
- if (devpriv->dac1_coding == dac_2comp)
- d ^= 0x800;
- outw(d, dev->iobase + DAC1_REG);
- break;
- default:
- return -EINVAL;
- }
- devpriv->ao_readback[chan] = data[i];
+ unsigned int val = data[i];
+
+ devpriv->ao_readback[chan] = val;
+
+ if (munge)
+ val ^= 0x800;
+
+ outw(val, dev->iobase + reg);
}
- return i;
+
+ return insn->n;
}
static int atmio16d_dio_insn_bits(struct comedi_device *dev,
--
2.0.3
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