From: Jeff Dischler <jdischler@xes-inc.com>
Date: Wed, 29 Sep 2010 18:46:19 +0000 (-0500)
Subject: ds1621: Fix negative temperature readings
X-Git-Tag: v2010.12-rc1~154
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7d85f1dc5cf1269ecb41de983c29386e6cddf910;p=platform%2Fkernel%2Fu-boot.git

ds1621: Fix negative temperature readings

Fix bug where signed data was processed as unsigned.  The bug previously
resulted in negative temperature readings wrapping around, eg -10 became
245.

Signed-off-by: Jeff Dischler <jdischler@xes-inc.com>
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
---

diff --git a/drivers/hwmon/ds1621.c b/drivers/hwmon/ds1621.c
index 60bf502..5a2ea62 100644
--- a/drivers/hwmon/ds1621.c
+++ b/drivers/hwmon/ds1621.c
@@ -80,7 +80,7 @@ int dtt_read(int sensor, int reg)
 
 	/* Handle 2 byte result */
 	if (dlen == 2)
-		return ((int)((short)data[1] + (((short)data[0]) << 8)));
+		return (short)((data[0] << 8) | data[1]);
 
 	return (int)data[0];
 }