staging: comedi: pcl711: define the mode register magic numbers

Define the magic numbers used with the mode register.

For the PCL711B board, the mode register also contains the irq number
that is being used. Introduce a helper function to write to the mode
register so that this irq number is always included when needed.
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/pcl711.c

@@ -83,7 +83,14 @@ supported.
 #define PCL711_MUX_CS0		(1 << 4)
 #define PCL711_MUX_CS1		(1 << 5)
 #define PCL711_MUX_DIFF		(PCL711_MUX_CS0 | PCL711_MUX_CS1)
-#define PCL711_MODE		0x0b
+#define PCL711_MODE_REG		0x0b
+#define PCL711_MODE_DEFAULT	(0 << 0)
+#define PCL711_MODE_SOFTTRIG	(1 << 0)
+#define PCL711_MODE_EXT		(2 << 0)
+#define PCL711_MODE_EXT_IRQ	(3 << 0)
+#define PCL711_MODE_PACER	(4 << 0)
+#define PCL711_MODE_PACER_IRQ	(6 << 0)
+#define PCL711_MODE_IRQ(x)	(((x) & 0x7) << 4)
 #define PCL711_SOFTTRIG		0x0c
 #define PCL711_DO_LO		0x0d
 #define PCL711_DO_HI		0x0e
@@ -183,6 +190,16 @@ struct pcl711_private {
 	unsigned int divisor2;
 };
 
+static void pcl711_ai_set_mode(struct comedi_device *dev, unsigned int mode)
+{
+	struct pcl711_private *devpriv = dev->private;
+
+	if (mode == PCL711_MODE_EXT_IRQ || mode == PCL711_MODE_PACER_IRQ)
+		mode |= devpriv->mode;
+
+	outb(mode, dev->iobase + PCL711_MODE_REG);
+}
+
 static unsigned int pcl711_ai_get_sample(struct comedi_device *dev,
 					 struct comedi_subdevice *s)
 {
@@ -214,9 +231,9 @@ static irqreturn_t pcl711_interrupt(int irq, void *d)
 	/* FIXME! Nothing else sets ntrig! */
 	if (!(--devpriv->ntrig)) {
 		if (board->is_8112)
-			outb(1, dev->iobase + PCL711_MODE);
+			pcl711_ai_set_mode(dev, PCL711_MODE_SOFTTRIG);
 		else
-			outb(0, dev->iobase + PCL711_MODE);
+			pcl711_ai_set_mode(dev, PCL711_MODE_DEFAULT);
 
 		s->async->events |= COMEDI_CB_EOA;
 	}
@@ -274,11 +291,7 @@ static int pcl711_ai_insn(struct comedi_device *dev, struct comedi_subdevice *s,
 	pcl711_set_changain(dev, insn->chanspec);
 
 	for (n = 0; n < insn->n; n++) {
-		/*
-		 *  Write the correct mode (software polling) and start polling
-		 *  by writing to the trigger register
-		 */
-		outb(1, dev->iobase + PCL711_MODE);
+		pcl711_ai_set_mode(dev, PCL711_MODE_SOFTTRIG);
 
 		if (!board->is_8112)
 			outb(0, dev->iobase + PCL711_SOFTTRIG);
@@ -368,7 +381,6 @@ static int pcl711_ai_cmdtest(struct comedi_device *dev,
 
 static int pcl711_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
 {
-	struct pcl711_private *devpriv = dev->private;
 	int timer1, timer2;
 	struct comedi_cmd *cmd = &s->async->cmd;
 
@@ -400,13 +412,9 @@ static int pcl711_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
 		/* clear pending interrupts (just in case) */
 		outb(0, dev->iobase + PCL711_CLRINTR);
 
-		/*
-		 *  Set mode to IRQ transfer
-		 */
-		outb(devpriv->mode | 6, dev->iobase + PCL711_MODE);
+		pcl711_ai_set_mode(dev, PCL711_MODE_PACER_IRQ);
 	} else {
-		/* external trigger */
-		outb(devpriv->mode | 3, dev->iobase + PCL711_MODE);
+		pcl711_ai_set_mode(dev, PCL711_MODE_EXT_IRQ);
 	}
 
 	return 0;
@@ -510,7 +518,7 @@ static int pcl711_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 			 * mode register.
 			 */
 			if (board->is_pcl711b)
-				devpriv->mode = (dev->irq << 4);
+				devpriv->mode = PCL711_MODE_IRQ(dev->irq);
 		}
 	}