staging: comedi: das08: rename and split DAS08JR_DIO

The `DAS08JR_DIO` macro contains the offset to the read-only digital
input register and write-only digital output register on the "JR"
boards.  Replace the macro with two new macros (with the same numeric
value) named `DAS08JR_DI_REG` for the digital input register and
`DAS08JR_DO_REG` for the digital output register, 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 76e35d4..c015bb6 100644 (file)
--- a/drivers/staging/comedi/drivers/das08.c
+++ b/drivers/staging/comedi/drivers/das08.c
@@ -95,7 +95,8 @@
 
 */
 
-#define DAS08JR_DIO            3
+#define DAS08JR_DI_REG         0x03    /* (R) digital inputs ("JR" boards) */
+#define DAS08JR_DO_REG         0x03    /* (W) digital outputs ("JR" boards) */
 #define DAS08JR_AO_LSB(x)      ((x) ? 6 : 4)
 #define DAS08JR_AO_MSB(x)      ((x) ? 7 : 5)
 
@@ -324,7 +325,7 @@ static int das08jr_di_rbits(struct comedi_device *dev,
                            struct comedi_insn *insn, unsigned int *data)
 {
        data[0] = 0;
-       data[1] = inb(dev->iobase + DAS08JR_DIO);
+       data[1] = inb(dev->iobase + DAS08JR_DI_REG);
 
        return insn->n;
 }
@@ -335,7 +336,7 @@ static int das08jr_do_wbits(struct comedi_device *dev,
                            unsigned int *data)
 {
        if (comedi_dio_update_state(s, data))
-               outb(s->state, dev->iobase + DAS08JR_DIO);
+               outb(s->state, dev->iobase + DAS08JR_DO_REG);
 
        data[1] = s->state;
 
@@ -355,7 +356,7 @@ static void das08_ao_set_data(struct comedi_device *dev,
                outb(lsb, dev->iobase + DAS08JR_AO_LSB(chan));
                outb(msb, dev->iobase + DAS08JR_AO_MSB(chan));
                /* load DACs */
-               inb(dev->iobase + DAS08JR_DIO);
+               inb(dev->iobase + DAS08JR_DI_REG);
        } else {
                outb(lsb, dev->iobase + DAS08AO_AO_LSB(chan));
                outb(msb, dev->iobase + DAS08AO_AO_MSB(chan));