In preperation for adding async command support, introduce a helper
function to set chan/range/aref information when reading an analog
input sample.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gr...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/ni_daq_700.c | 40 +++++++++++++++++------------
1 file changed, 24 insertions(+), 16 deletions(-)
diff --git a/drivers/staging/comedi/drivers/ni_daq_700.c
b/drivers/staging/comedi/drivers/ni_daq_700.c
index 2b4d4e6..2a474b0 100644
--- a/drivers/staging/comedi/drivers/ni_daq_700.c
+++ b/drivers/staging/comedi/drivers/ni_daq_700.c
@@ -150,6 +150,29 @@ static int daq700_dio_insn_config(struct comedi_device
*dev,
return insn->n;
}
+static void daq700_ai_set_chanspec(struct comedi_device *dev,
+ unsigned int chanspec)
+{
+ unsigned int chan = CR_CHAN(chanspec);
+ unsigned int range = CR_RANGE(chanspec);
+ unsigned int aref = CR_AREF(chanspec);
+ unsigned int val;
+
+ /* set channel mode/range */
+ if (range >= 1)
+ range++; /* convert range to hardware value */
+ val = DAQ700_CMD3_ARNG(range);
+ if (aref == AREF_DIFF)
+ val |= DAQ700_CMD3_DIFF;
+ outb(val, dev->iobase + DAQ700_CMD3_REG);
+
+ /* set multiplexer for single-channel scan */
+ outb(DAQ700_CMD1_SCANDISAB | DAQ700_CMD1_MA(chan),
+ dev->iobase + DAQ700_CMD1_REG);
+ /* mux needs 2us to really settle [Fred Brooks]. */
+ udelay(2);
+}
+
static void daq700_ai_start_conv(struct comedi_device *dev)
{
/*
@@ -195,26 +218,11 @@ static int daq700_ai_insn_read(struct comedi_device *dev,
struct comedi_insn *insn,
unsigned int *data)
{
- unsigned int chan = CR_CHAN(insn->chanspec);
- unsigned int range = CR_RANGE(insn->chanspec);
- unsigned int aref = CR_AREF(insn->chanspec);
unsigned int val;
int ret;
int i;
- /* set channel mode/range */
- if (range >= 1)
- range++; /* convert range to hardware value */
- val = DAQ700_CMD3_ARNG(range);
- if (aref == AREF_DIFF)
- val |= DAQ700_CMD3_DIFF;
- outb(val, dev->iobase + DAQ700_CMD3_REG);
-
- /* set multiplexer for single-channel scan */
- outb(DAQ700_CMD1_SCANDISAB | DAQ700_CMD1_MA(chan),
- dev->iobase + DAQ700_CMD1_REG);
- /* mux needs 2us to really settle [Fred Brooks]. */
- udelay(2);
+ daq700_ai_set_chanspec(dev, insn->chanspec);
for (i = 0; i < insn->n; i++) {
daq700_ai_start_conv(dev);
--
1.9.3
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