staging: comedi: 8255: rename cb_arg and cb_func

The 8255's private data variables cb_arg and cb_func are actually
the iobase for the 8255 device and the pointer to the io function
to access the device. Rename them as such to improve the readability
of the driver.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/8255.c

@@ -98,8 +98,8 @@ I/O port base address can be found in the output of 'lspci -v'.
 #define CR_CW		0x80
 
 struct subdev_8255_private {
-	unsigned long cb_arg;
-	int (*cb_func) (int, int, int, unsigned long);
+	unsigned long iobase;
+	int (*io) (int, int, int, unsigned long);
 	int have_irq;
 };
 
@@ -109,8 +109,8 @@ void subdev_8255_interrupt(struct comedi_device *dev,
 	struct subdev_8255_private *spriv = s->private;
 	short d;
 
-	d = spriv->cb_func(0, _8255_DATA, 0, spriv->cb_arg);
-	d |= (spriv->cb_func(0, _8255_DATA + 1, 0, spriv->cb_arg) << 8);
+	d = spriv->io(0, _8255_DATA, 0, spriv->iobase);
+	d |= (spriv->io(0, _8255_DATA + 1, 0, spriv->iobase) << 8);
 
 	comedi_buf_put(s->async, d);
 	s->async->events |= COMEDI_CB_EOS;
@@ -142,19 +142,19 @@ static int subdev_8255_insn(struct comedi_device *dev,
 		s->state |= (data[0] & data[1]);
 
 		if (data[0] & 0xff)
-			spriv->cb_func(1, _8255_DATA, s->state & 0xff,
-				       spriv->cb_arg);
+			spriv->io(1, _8255_DATA, s->state & 0xff,
+				  spriv->iobase);
 		if (data[0] & 0xff00)
-			spriv->cb_func(1, _8255_DATA + 1,
-				       (s->state >> 8) & 0xff, spriv->cb_arg);
+			spriv->io(1, _8255_DATA + 1,
+				  (s->state >> 8) & 0xff, spriv->iobase);
 		if (data[0] & 0xff0000)
-			spriv->cb_func(1, _8255_DATA + 2,
-				       (s->state >> 16) & 0xff, spriv->cb_arg);
+			spriv->io(1, _8255_DATA + 2,
+				  (s->state >> 16) & 0xff, spriv->iobase);
 	}
 
-	data[1] = spriv->cb_func(0, _8255_DATA, 0, spriv->cb_arg);
-	data[1] |= (spriv->cb_func(0, _8255_DATA + 1, 0, spriv->cb_arg) << 8);
-	data[1] |= (spriv->cb_func(0, _8255_DATA + 2, 0, spriv->cb_arg) << 16);
+	data[1] = spriv->io(0, _8255_DATA, 0, spriv->iobase);
+	data[1] |= (spriv->io(0, _8255_DATA + 1, 0, spriv->iobase) << 8);
+	data[1] |= (spriv->io(0, _8255_DATA + 2, 0, spriv->iobase) << 16);
 
 	return 2;
 }
@@ -174,7 +174,7 @@ static void do_config(struct comedi_device *dev, struct comedi_subdevice *s)
 		config |= CR_C_LO_IO;
 	if (!(s->io_bits & 0xf00000))
 		config |= CR_C_HI_IO;
-	spriv->cb_func(1, _8255_CR, config, spriv->cb_arg);
+	spriv->io(1, _8255_CR, config, spriv->iobase);
 }
 
 static int subdev_8255_insn_config(struct comedi_device *dev,
@@ -323,11 +323,11 @@ int subdev_8255_init(struct comedi_device *dev, struct comedi_subdevice *s,
 		return -ENOMEM;
 	s->private = spriv;
 
-	spriv->cb_arg = arg;
+	spriv->iobase = arg;
 	if (cb == NULL)
-		spriv->cb_func = subdev_8255_cb;
+		spriv->io = subdev_8255_cb;
 	else
-		spriv->cb_func = cb;
+		spriv->io = cb;
 	s->insn_bits = subdev_8255_insn;
 	s->insn_config = subdev_8255_insn_config;
 
@@ -425,7 +425,7 @@ static void dev_8255_detach(struct comedi_device *dev)
 		s = dev->subdevices + i;
 		if (s->type != COMEDI_SUBD_UNUSED) {
 			spriv = s->private;
-			release_region(spriv->cb_arg, _8255_SIZE);
+			release_region(spriv->iobase, _8255_SIZE);
 		}
 		subdev_8255_cleanup(dev, s);
 	}