linux-kernel - [PATCH 09/10] staging: comedi: ni_670x: cleanup ni_670x_dio_insn

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Message-ID: <201206291741.11258.hartleys@visionengravers.com>
Date:	Fri, 29 Jun 2012 17:41:10 -0700
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
CC:	<devel@...verdev.osuosl.org>, <abbotti@....co.uk>,
	<fmhess@...rs.sourceforge.net>, <gregkh@...uxfoundation.org>
Subject: [PATCH 09/10] staging: comedi: ni_670x: cleanup ni_670x_dio_insn_bits()

Add local variable for the io_addr, mask. and bits used in this
function so that the comments are not needed and the writel/readl
calls are a bit cleaner.

Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
Cc: Ian Abbott <abbotti@....co.uk>
Cc: Frank Mori Hess <fmhess@...rs.sourceforge.net>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/comedi/drivers/ni_670x.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/comedi/drivers/ni_670x.c b/drivers/staging/comedi/drivers/ni_670x.c
index 1d3590e..86e9e70 100644
--- a/drivers/staging/comedi/drivers/ni_670x.c
+++ b/drivers/staging/comedi/drivers/ni_670x.c
@@ -146,19 +146,19 @@ static int ni_670x_dio_insn_bits(struct comedi_device *dev,
 				 struct comedi_insn *insn, unsigned int *data)
 {
 	struct ni_670x_private *devpriv = dev->private;
+	void __iomem *io_addr = devpriv->mite->daq_io_addr +
+					DIO_PORT0_DATA_OFFSET;
+	unsigned int mask = data[0];
+	unsigned int bits = data[1];
 
-	/* The insn data is a mask in data[0] and the new data
-	 * in data[1], each channel cooresponding to a bit. */
-	if (data[0]) {
-		s->state &= ~data[0];
-		s->state |= data[0] & data[1];
-		writel(s->state,
-		       devpriv->mite->daq_io_addr + DIO_PORT0_DATA_OFFSET);
+	if (mask) {
+		s->state &= ~mask;
+		s->state |= (bits & mask);
+
+		writel(s->state, io_addr);
 	}
 
-	/* on return, data[1] contains the value of the digital
-	 * input lines. */
-	data[1] = readl(devpriv->mite->daq_io_addr + DIO_PORT0_DATA_OFFSET);
+	data[1] = readl(io_addr);
 
 	return insn->n;
 }
-- 
1.7.11

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