Introduce a helper function to set the analog input acquisition mode.
This will be needed when the (*do_cmd) function is completed to support
async commands.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/das6402.c | 31 ++++++++++++++++++++-----------
1 file changed, 20 insertions(+), 11 deletions(-)
diff --git a/drivers/staging/comedi/drivers/das6402.c b/drivers/staging/comedi/drivers/das6402.c
index 511b6b3..2a810b6 100644
--- a/drivers/staging/comedi/drivers/das6402.c
+++ b/drivers/staging/comedi/drivers/das6402.c
@@ -202,6 +202,23 @@ static irqreturn_t das6402_interrupt(int irq, void *d)
return IRQ_HANDLED;
}
+static void das6402_ai_set_mode(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ unsigned int chanspec,
+ unsigned int mode)
+{
+ unsigned int range = CR_RANGE(chanspec);
+ unsigned int aref = CR_AREF(chanspec);
+
+ mode |= DAS6402_MODE_RANGE(range);
+ if (aref == AREF_GROUND)
+ mode |= DAS6402_MODE_SE;
+ if (comedi_range_is_unipolar(s, range))
+ mode |= DAS6402_MODE_UNI;
+
+ das6402_set_mode(dev, mode);
+}
+
static int das6402_ai_cmd(struct comedi_device *dev,
struct comedi_subdevice *s)
{
@@ -349,26 +366,18 @@ static int das6402_ai_insn_read(struct comedi_device *dev,
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;
- val = DAS6402_MODE_RANGE(range) | DAS6402_MODE_POLLED;
- if (aref == AREF_DIFF) {
- if (chan > s->n_chan / 2)
- return -EINVAL;
- } else {
- val |= DAS6402_MODE_SE;
- }
- if (comedi_range_is_unipolar(s, range))
- val |= DAS6402_MODE_UNI;
+ if (aref == AREF_DIFF && chan > (s->n_chan / 2))
+ return -EINVAL;
/* enable software conversion trigger */
outb(DAS6402_CTRL_SOFT_TRIG, dev->iobase + DAS6402_CTRL_REG);
- das6402_set_mode(dev, val);
+ das6402_ai_set_mode(dev, s, insn->chanspec, DAS6402_MODE_POLLED);
/* load the mux for single channel conversion */
outw(DAS6402_AI_MUX_HI(chan) | DAS6402_AI_MUX_LO(chan),
--
2.0.3
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