diff options
| author | Ian Abbott <abbotti@mev.co.uk> | 2015-06-05 18:30:14 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-06-12 17:06:40 -0700 |
| commit | 2398391017ddec9427bdb94cc5d70326eaf8a3c5 (patch) | |
| tree | f96608b250a60d33b41cc31fe0acee6e087dc05b | |
| parent | 851e5d5475de796560683e2a4b28af0a7da177e1 (diff) | |
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>
| -rw-r--r-- | drivers/staging/comedi/drivers/das08.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/staging/comedi/drivers/das08.c b/drivers/staging/comedi/drivers/das08.c index 04843080b5e8..935bbfb213e6 100644 --- 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 |