linux-kernel - [09/70] hwmon: (lm95241) Fix negative temperature results

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Message-Id: <20110801232051.470488160@clark.kroah.org>
Date:	Mon, 01 Aug 2011 16:18:24 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Guenter Roeck <guenter.roeck@...csson.com>,
	Jean Delvare <khali@...ux-fr.org>
Subject: [09/70] hwmon: (lm95241) Fix negative temperature results

2.6.39-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Guenter Roeck <guenter.roeck@...csson.com>

commit 0c2a40e2fe4f4af0410f57e84b95b817ec15aa70 upstream.

Negative temperatures were returned in degrees C instead of milli-Degrees C.
Also, negative temperatures were reported for remote temperature sensors even
if the chip was configured for positive-only results.

Fix by detecting temperature modes, and by treating negative temperatures
similar to positive temperatures, with appropriate sign extension.

Signed-off-by: Guenter Roeck <guenter.roeck@...csson.com>
Acked-by: Jean Delvare <khali@...ux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/hwmon/lm95241.c |   20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

--- a/drivers/hwmon/lm95241.c
+++ b/drivers/hwmon/lm95241.c
@@ -98,11 +98,16 @@ struct lm95241_data {
 };
 
 /* Conversions */
-static int TempFromReg(u8 val_h, u8 val_l)
+static int temp_from_reg_signed(u8 val_h, u8 val_l)
 {
-	if (val_h & 0x80)
-		return val_h - 0x100;
-	return val_h * 1000 + val_l * 1000 / 256;
+	s16 val_hl = (val_h << 8) | val_l;
+	return val_hl * 1000 / 256;
+}
+
+static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
+{
+	u16 val_hl = (val_h << 8) | val_l;
+	return val_hl * 1000 / 256;
 }
 
 static struct lm95241_data *lm95241_update_device(struct device *dev)
@@ -135,10 +140,13 @@ static ssize_t show_input(struct device
 			  char *buf)
 {
 	struct lm95241_data *data = lm95241_update_device(dev);
+	int index = to_sensor_dev_attr(attr)->index;
 
 	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
-		TempFromReg(data->temp[to_sensor_dev_attr(attr)->index],
-			    data->temp[to_sensor_dev_attr(attr)->index + 1]));
+			index == 0 || (data->config & (1 << (index / 2))) ?
+		temp_from_reg_signed(data->temp[index], data->temp[index + 1]) :
+		temp_from_reg_unsigned(data->temp[index],
+				       data->temp[index + 1]));
 }
 
 static ssize_t show_type(struct device *dev, struct device_attribute *attr,


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