linux-kernel - [PATCH 10/32] staging: comedi: das08: rename and rewrite DAS08

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Date:	Fri,  5 Jun 2015 18:30:13 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	<driverdev-devel@...uxdriverproject.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ian Abbott <abbotti@....co.uk>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH 10/32] staging: comedi: das08: rename and rewrite DAS08_EOC

The `DAS08_EOC` macro contains a mask for the "end of A/D conversion"
bit in the status register.  The logic is reverse sense in that the bit
is set to 1 while the conversion is in progress and set to 0 when the
conversion is complete.  Rename the macro to `DAS08_STATUS_AI_BUSY` and
add a comment.  Also make use of the `BIT()` macro to define the value.

Signed-off-by: Ian Abbott <abbotti@....co.uk>
---
 drivers/staging/comedi/drivers/das08.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/comedi/drivers/das08.c b/drivers/staging/comedi/drivers/das08.c
index eecbf4d..0484308 100644
--- a/drivers/staging/comedi/drivers/das08.c
+++ b/drivers/staging/comedi/drivers/das08.c
@@ -58,7 +58,7 @@
 #define DAS08_AI_MSB_REG	0x01	/* (R) AI most significant bits */
 #define DAS08_AI_TRIG_REG	0x01	/* (W) AI software trigger */
 #define DAS08_STATUS_REG	0x02	/* (R) status */
-#define   DAS08_EOC			(1<<7)
+#define DAS08_STATUS_AI_BUSY	BIT(7)	/* AI conversion in progress */
 #define   DAS08_IRQ			(1<<3)
 #define   DAS08_IP(x)			(((x)>>4)&0x7)
 #define DAS08_CONTROL		2
@@ -206,7 +206,7 @@ static int das08_ai_eoc(struct comedi_device *dev,
 	unsigned int status;
 
 	status = inb(dev->iobase + DAS08_STATUS_REG);
-	if ((status & DAS08_EOC) == 0)
+	if ((status & DAS08_STATUS_AI_BUSY) == 0)
 		return 0;
 	return -EBUSY;
 }
-- 
2.1.4

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