staging: comedi: das08: rename DAS08_CONTROL

The `DAS08_CONTROL` macro contains the offset to the write-only control
register.  Rename it to `DAS08_CONTROL_REG` and add a comment.

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 eef0456..b43bc2d 100644 (file)
--- a/drivers/staging/comedi/drivers/das08.c
+++ b/drivers/staging/comedi/drivers/das08.c
@@ -67,7 +67,7 @@
 #define DAS08_STATUS_IRQ       BIT(3)  /* latched interrupt input */
 /* digital inputs (not "JR" boards) */
 #define DAS08_STATUS_DI(x)     (((x) & 0x70) >> 4)
-#define DAS08_CONTROL          2
+#define DAS08_CONTROL_REG      0x02    /* (W) control */
 #define   DAS08_MUX_MASK       0x7
 #define   DAS08_MUX(x)         ((x) & DAS08_MUX_MASK)
 #define   DAS08_INTE                   (1<<3)
@@ -240,7 +240,7 @@ static int das08_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
        spin_lock(&dev->spinlock);
        devpriv->do_mux_bits &= ~DAS08_MUX_MASK;
        devpriv->do_mux_bits |= DAS08_MUX(chan);
-       outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL);
+       outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL_REG);
        spin_unlock(&dev->spinlock);
 
        if (devpriv->pg_gainlist) {
@@ -305,7 +305,7 @@ static int das08_do_wbits(struct comedi_device *dev,
                spin_lock(&dev->spinlock);
                devpriv->do_mux_bits &= ~DAS08_DO_MASK;
                devpriv->do_mux_bits |= DAS08_OP(s->state);
-               outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL);
+               outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL_REG);
                spin_unlock(&dev->spinlock);
        }