staging: comedi: das08: rename DAS08AO_AO_LSB() and DAS08AO_AO_MSB()

The `DAS08AO_AO_LSB(x)` macro returns the offset to the analog output
low byte register for channel x (0 or 1) for "AOL", "AOM", and "AOH"
boards.  The `DAS08AO_AO_MSB(x)` macro returns the offset to the
corresponding high byte register.  Rename the macros to
`DAS08AOX_AO_LSB_REG(x)` and `DAS08AOX_AO_MSB_REG(x)` respectively, and
add some comments.

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

diff --git a/drivers/staging/comedi/drivers/das08.c b/drivers/staging/comedi/drivers/das08.c
index 8aa80116f1cf456771505ea957a5d371ad8b8020..005a7ef89f8cb746bdf77496a0e2e230d22510a4 100644 (file)
--- a/drivers/staging/comedi/drivers/das08.c
+++ b/drivers/staging/comedi/drivers/das08.c
@@ -134,8 +134,10 @@
   cdef 8255
 */
 
-#define DAS08AO_AO_LSB(x)      ((x) ? 0xa : 8)
-#define DAS08AO_AO_MSB(x)      ((x) ? 0xb : 9)
+/* (W) analog output l.s.b. registers for 2 channels ("AOx" boards) */
+#define DAS08AOX_AO_LSB_REG(x) ((x) ? 0x0a : 0x08)
+/* (W) analog output m.s.b. registers for 2 channels ("AOx" boards) */
+#define DAS08AOX_AO_MSB_REG(x) ((x) ? 0x0b : 0x09)
 #define DAS08AO_AO_UPDATE      8
 
 /* gainlist same as _pgx_ below */
@@ -369,8 +371,8 @@ static void das08_ao_set_data(struct comedi_device *dev,
                /* load DACs */
                inb(dev->iobase + DAS08JR_AO_UPDATE_REG);
        } else {
-               outb(lsb, dev->iobase + DAS08AO_AO_LSB(chan));
-               outb(msb, dev->iobase + DAS08AO_AO_MSB(chan));
+               outb(lsb, dev->iobase + DAS08AOX_AO_LSB_REG(chan));
+               outb(msb, dev->iobase + DAS08AOX_AO_MSB_REG(chan));
                /* load DACs */
                inb(dev->iobase + DAS08AO_AO_UPDATE);
        }