linux-kernel - [PATCH 18/32] staging: comedi: das08: rename DAS08JR_AO_LSB() and DAS08JR_AO

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Date:	Fri,  5 Jun 2015 18:30:21 +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 18/32] staging: comedi: das08: rename DAS08JR_AO_LSB() and DAS08JR_AO_MSB()

The `DAS08JR_AO_LSB(x)` macro returns the offset to the analog output
low byte register for channel x (0 or 1) for "JR" boards with analog
output support.  The `DAS08JR_AO_MSB(x)` macro returns the offset to the
corresponding high byte register.  Rename the macros to
`DAS08JR_AO_LSB_REG(x)` and `DAS08JR_AO_MSB_REG(x)` respectively, and
add some comments.

Signed-off-by: Ian Abbott <abbotti@....co.uk>
---
 drivers/staging/comedi/drivers/das08.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/comedi/drivers/das08.c b/drivers/staging/comedi/drivers/das08.c
index c015bb6..51637b1 100644
--- a/drivers/staging/comedi/drivers/das08.c
+++ b/drivers/staging/comedi/drivers/das08.c
@@ -97,8 +97,10 @@
 
 #define DAS08JR_DI_REG		0x03	/* (R) digital inputs ("JR" boards) */
 #define DAS08JR_DO_REG		0x03	/* (W) digital outputs ("JR" boards) */
-#define DAS08JR_AO_LSB(x)	((x) ? 6 : 4)
-#define DAS08JR_AO_MSB(x)	((x) ? 7 : 5)
+/* (W) analog output l.s.b. registers for 2 channels ("JR" boards) */
+#define DAS08JR_AO_LSB_REG(x)	((x) ? 0x06 : 0x04)
+/* (W) analog output m.s.b. registers for 2 channels ("JR" boards) */
+#define DAS08JR_AO_MSB_REG(x)	((x) ? 0x07 : 0x05)
 
 /*
     cio-das08_aox.pdf
@@ -353,8 +355,8 @@ static void das08_ao_set_data(struct comedi_device *dev,
 	lsb = data & 0xff;
 	msb = (data >> 8) & 0xff;
 	if (thisboard->is_jr) {
-		outb(lsb, dev->iobase + DAS08JR_AO_LSB(chan));
-		outb(msb, dev->iobase + DAS08JR_AO_MSB(chan));
+		outb(lsb, dev->iobase + DAS08JR_AO_LSB_REG(chan));
+		outb(msb, dev->iobase + DAS08JR_AO_MSB_REG(chan));
 		/* load DACs */
 		inb(dev->iobase + DAS08JR_DI_REG);
 	} else {
-- 
2.1.4

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