staging: comedi: das08: rename and rewrite DAS08_IRQ

The `DAS08_IRQ` macro contains a mask for the "IRQ" status bit.  This is
set to 1 when a rising edge is detected on the external interrupt input
pin of the external connector (which may be jumpered to a pacer output).
It is cleared by setting the "INTE" control bit to 0.  It is not used on
"JR" boards.  Rename the macro to `DAS08_STATUS_IRQ` and add a comment.
Also use the `BIT()` macro to define the value.

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 0484308..935bbfb 100644 (file)
--- a/drivers/staging/comedi/drivers/das08.c
+++ b/drivers/staging/comedi/drivers/das08.c
@@ -59,7 +59,12 @@
 #define DAS08_AI_TRIG_REG      0x01    /* (W) AI software trigger */
 #define DAS08_STATUS_REG       0x02    /* (R) status */
 #define DAS08_STATUS_AI_BUSY   BIT(7)  /* AI conversion in progress */
-#define   DAS08_IRQ                    (1<<3)
+/*
+ * The IRQ status bit is set to 1 by a rising edge on the external interrupt
+ * input (which may be jumpered to the pacer output).  It is cleared by
+ * setting the INTE control bit to 0.  Not present on "JR" boards.
+ */
+#define DAS08_STATUS_IRQ       BIT(3)  /* latched interrupt input */
 #define   DAS08_IP(x)                  (((x)>>4)&0x7)
 #define DAS08_CONTROL          2
 #define   DAS08_MUX_MASK       0x7