[PATCH 13/21] staging: comedi: ni_at_ao: introduce atao_select_reg_group()

[H Hartley Sweeten]

To clarify the code a bit, introduce a helper function to set/clear
the GRP2WR bit in the CFG1 register. This bit selects which group of
registers are used for the registers that share the same I/O addresses.

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_at_ao.c | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/drivers/staging/comedi/drivers/ni_at_ao.c 
b/drivers/staging/comedi/drivers/ni_at_ao.c
index 7803ad1..65c4712 100644
--- a/drivers/staging/comedi/drivers/ni_at_ao.c
+++ b/drivers/staging/comedi/drivers/ni_at_ao.c
@@ -124,6 +124,17 @@ struct atao_private {
        unsigned char caldac[21];
 };
 
+static void atao_select_reg_group(struct comedi_device *dev, int group)
+{
+       struct atao_private *devpriv = dev->private;
+
+       if (group)
+               devpriv->cfg1 |= ATAO_CFG1_GRP2WR;
+       else
+               devpriv->cfg1 &= ~ATAO_CFG1_GRP2WR;
+       outw(devpriv->cfg1, dev->iobase + ATAO_CFG1_REG);
+}
+
 static int atao_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
                         struct comedi_insn *insn, unsigned int *data)
 {
@@ -134,15 +145,11 @@ static int atao_ao_winsn(struct comedi_device *dev, 
struct comedi_subdevice *s,
 
        for (i = 0; i < insn->n; i++) {
                bits = data[i] - 0x800;
-               if (chan == 0) {
-                       devpriv->cfg1 |= ATAO_CFG1_GRP2WR;
-                       outw(devpriv->cfg1, dev->iobase + ATAO_CFG1_REG);
-               }
+               if (chan == 0)
+                       atao_select_reg_group(dev, 1);
                outw(bits, dev->iobase + ATAO_AO_REG(chan));
-               if (chan == 0) {
-                       devpriv->cfg1 &= ~ATAO_CFG1_GRP2WR;
-                       outw(devpriv->cfg1, dev->iobase + ATAO_CFG1_REG);
-               }
+               if (chan == 0)
+                       atao_select_reg_group(dev, 0);
                devpriv->ao_readback[chan] = data[i];
        }
 
@@ -312,15 +319,11 @@ static void atao_reset(struct comedi_device *dev)
 
        inw(dev->iobase + ATAO_FIFO_CLEAR_REG);
 
-       devpriv->cfg1 |= ATAO_CFG1_GRP2WR;
-       outw(devpriv->cfg1, dev->iobase + ATAO_CFG1_REG);
-
+       atao_select_reg_group(dev, 1);
        outw(0, dev->iobase + ATAO_2_INT1CLR_REG);
        outw(0, dev->iobase + ATAO_2_INT2CLR_REG);
        outw(0, dev->iobase + ATAO_2_DMATCCLR_REG);
-
-       devpriv->cfg1 &= ~ATAO_CFG1_GRP2WR;
-       outw(devpriv->cfg1, dev->iobase + ATAO_CFG1_REG);
+       atao_select_reg_group(dev, 0);
 }
 
 static int atao_attach(struct comedi_device *dev, struct comedi_devconfig *it)
-- 
1.8.3.2

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