linux-kernel - [PATCH 3/6] hwmon: jc42: use bitops' sign

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Date:	Mon, 15 Dec 2014 17:18:34 +0100
From:	Martin Kepplinger <martink@...teo.de>
To:	peterz@...radead.org
Cc:	mingo@...nel.org, tytso@....edu, linux-kernel@...r.kernel.org,
	Martin Kepplinger <martink@...teo.de>
Subject: [PATCH 3/6] hwmon: jc42: use bitops' sign_extend16

---
 drivers/hwmon/jc42.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/hwmon/jc42.c b/drivers/hwmon/jc42.c
index 388f8bc..335a2de 100644
--- a/drivers/hwmon/jc42.c
+++ b/drivers/hwmon/jc42.c
@@ -31,6 +31,7 @@
 #include <linux/hwmon-sysfs.h>
 #include <linux/err.h>
 #include <linux/mutex.h>
+#include <linux/bitops.h>
 
 /* Addresses to scan */
 static const unsigned short normal_i2c[] = {
@@ -215,9 +216,7 @@ static int jc42_temp_from_reg(s16 reg)
 {
 	reg &= 0x1fff;
 
-	/* sign extend register */
-	if (reg & 0x1000)
-		reg |= 0xf000;
+	reg = sign_extend16(reg, 12);
 
 	/* convert from 0.0625 to 0.001 resolution */
 	return reg * 125 / 2;
-- 
2.1.3

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