staging: comedi: daqboard2000: tidy up daqboard2000_8255_cb()

The 8255 driver (*io) callback now includes the comedi_device pointer.
Using this we can get the ioremap'ed base address.

Instead of passing the (cast) mmio address to subdev_8255_init(), pass
the 'iobase' of the 8255 registers (dioP2ExpansionIO8Bit).
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/daqboard2000.c

@@ -653,15 +653,13 @@ static void daqboard2000_initializeDac(struct comedi_device *dev)
 
 static int daqboard2000_8255_cb(struct comedi_device *dev,
 				int dir, int port, int data,
-				unsigned long ioaddr)
+				unsigned long iobase)
 {
-	void __iomem *mmio_base = (void __iomem *)ioaddr;
-
 	if (dir) {
-		writew(data, mmio_base + port * 2);
+		writew(data, dev->mmio + iobase + port * 2);
 		return 0;
 	}
-	return readw(mmio_base + port * 2);
+	return readw(dev->mmio + iobase + port * 2);
 }
 
 static const void *daqboard2000_find_boardinfo(struct comedi_device *dev,
@@ -745,7 +743,7 @@ static int daqboard2000_auto_attach(struct comedi_device *dev,
 
 	s = &dev->subdevices[2];
 	result = subdev_8255_init(dev, s, daqboard2000_8255_cb,
-			(unsigned long)(dev->mmio + dioP2ExpansionIO8Bit));
+				  dioP2ExpansionIO8Bit);
 	if (result)
 		return result;