staging: comedi: dmm32at: fix dmm32at_dio_insn_config()

This is the (*insn_config) function for a DIO subdevice. It should be
using the data[0] value as the "instruction" to perform on the subdevice.

Use the comedi_dio_insn_config() helper to properly handle instructions.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 19 insertions, 16 deletions

diff --git a/drivers/staging/comedi/drivers/dmm32at.c b/drivers/staging/comedi/drivers/dmm32at.c
index 5237f47d39ae..118a4fd129f9 100644
--- a/drivers/staging/comedi/drivers/dmm32at.c
+++ b/drivers/staging/comedi/drivers/dmm32at.c
@@ -648,31 +648,34 @@ static int dmm32at_dio_insn_bits(struct comedi_device *dev,
 
 static int dmm32at_dio_insn_config(struct comedi_device *dev,
                                    struct comedi_subdevice *s,
-                                   struct comedi_insn *insn, unsigned int *data)
+                                   struct comedi_insn *insn,
+                                   unsigned int *data)
 {
         struct dmm32at_private *devpriv = dev->private;
+        unsigned int chan = CR_CHAN(insn->chanspec);
+        unsigned int mask;
         unsigned char chanbit;
-        int chan = CR_CHAN(insn->chanspec);
-
-        if (insn->n != 1)
-                return -EINVAL;
+        int ret;
 
-        if (chan < 8)
+        if (chan < 8) {
+                mask = 0x0000ff;
                 chanbit = DMM32AT_DIRA;
-        else if (chan < 16)
+        } else if (chan < 16) {
+                mask = 0x00ff00;
                 chanbit = DMM32AT_DIRB;
-        else if (chan < 20)
+        } else if (chan < 20) {
+                mask = 0x0f0000;
                 chanbit = DMM32AT_DIRCL;
-        else
+        } else {
+                mask = 0xf00000;
                 chanbit = DMM32AT_DIRCH;
+        }
 
-        /* The input or output configuration of each digital line is
-         * configured by a special insn_config instruction.  chanspec
-         * contains the channel to be changed, and data[0] contains the
-         * value COMEDI_INPUT or COMEDI_OUTPUT. */
+        ret = comedi_dio_insn_config(dev, s, insn, data, mask);
+        if (ret)
+                return ret;
 
-        /* if output clear the bit, otherwise set it */
-        if (data[0] == COMEDI_OUTPUT)
+        if (data[0] == INSN_CONFIG_DIO_OUTPUT)
                 devpriv->dio_config &= ~chanbit;
         else
                 devpriv->dio_config |= chanbit;
@@ -681,7 +684,7 @@ static int dmm32at_dio_insn_config(struct comedi_device *dev,
         /* set the DIO's to the new configuration setting */
         outb(devpriv->dio_config, dev->iobase + DMM32AT_DIOCONF);
 
-        return 1;
+        return insn->n;
 }
 
 static int dmm32at_attach(struct comedi_device *dev,