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staging: comedi: das08: rename and rewrite DAS08_IRQ

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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>
This commit is contained in:
Ian Abbott 2015-06-05 18:30:14 +01:00 committed by Greg Kroah-Hartman
parent 851e5d5475
commit 2398391017
1 changed files with 6 additions and 1 deletions
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7
drivers/staging/comedi/drivers/das08.c
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@ -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