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>

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,