linux-kernel - [PATCH 12/32] staging: comedi: das08: rename and rewrite DAS08

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Message-Id: <1433525435-12986-13-git-send-email-abbotti@mev.co.uk>
Date:	Fri,  5 Jun 2015 18:30:15 +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 12/32] staging: comedi: das08: rename and rewrite DAS08_IP

The `DAS08_IP()` macro takes a value read from the status register and
returns the state of the three digital input channels (except on "JR"
boards).  Rename it to `DAS08_STATUS_DI()` and add a comment.  Also
re-arrange the expression used to extract the state of the digital
inputs for consistency with other register macros.

Signed-off-by: Ian Abbott <abbotti@....co.uk>
---
 drivers/staging/comedi/drivers/das08.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/comedi/drivers/das08.c b/drivers/staging/comedi/drivers/das08.c
index 935bbfb..eef0456 100644
--- a/drivers/staging/comedi/drivers/das08.c
+++ b/drivers/staging/comedi/drivers/das08.c
@@ -65,7 +65,8 @@
  * 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)
+/* digital inputs (not "JR" boards) */
+#define DAS08_STATUS_DI(x)	(((x) & 0x70) >> 4)
 #define DAS08_CONTROL		2
 #define   DAS08_MUX_MASK	0x7
 #define   DAS08_MUX(x)		((x) & DAS08_MUX_MASK)
@@ -287,7 +288,7 @@ static int das08_di_rbits(struct comedi_device *dev, struct comedi_subdevice *s,
 			  struct comedi_insn *insn, unsigned int *data)
 {
 	data[0] = 0;
-	data[1] = DAS08_IP(inb(dev->iobase + DAS08_STATUS_REG));
+	data[1] = DAS08_STATUS_DI(inb(dev->iobase + DAS08_STATUS_REG));
 
 	return insn->n;
 }
-- 
2.1.4

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