linux-kernel - [v1,1/1] hwmon: (nct7904) Fix the incorrect rang of temperature limitation registers.

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Message-ID: <20200512093806.28515-1-Amy.Shih@advantech.com.tw>
Date:   Tue, 12 May 2020 09:38:06 +0000
From:   <Amy.Shih@...antech.com.tw>
To:     <she90122@...il.com>
CC:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        <linux-hwmon@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <amy.shih@...antech.com.tw>, <oakley.ding@...antech.com.tw>,
        <jia.sui@...antech.com.cn>, <yuechao.zhao@...antech.com.cn>,
        <Hy.Lee@...antech.com.tw>
Subject: [v1,1/1] hwmon: (nct7904) Fix the incorrect rang of temperature limitation registers.

From: Amy Shih <amy.shih@...antech.com.tw>

The format of temperature limitation registers are 8-bit 2's complement
and the range is -128~127.
Converts the reading value to signed char to fix the incorrect range
of temperature limitation registers.

Signed-off-by: Amy Shih <amy.shih@...antech.com.tw>
---
 drivers/hwmon/nct7904.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/nct7904.c b/drivers/hwmon/nct7904.c
index 6fb06f7..04f2a8e 100644
--- a/drivers/hwmon/nct7904.c
+++ b/drivers/hwmon/nct7904.c
@@ -390,6 +390,7 @@ static int nct7904_read_temp(struct device *dev, u32 attr, int channel,
 	struct nct7904_data *data = dev_get_drvdata(dev);
 	int ret, temp;
 	unsigned int reg1, reg2, reg3;
+	s8 temps;
 
 	switch (attr) {
 	case hwmon_temp_input:
@@ -495,7 +496,8 @@ static int nct7904_read_temp(struct device *dev, u32 attr, int channel,
 
 	if (ret < 0)
 		return ret;
-	*val = ret * 1000;
+	temps = ret;
+	*val = temps * 1000;
 	return 0;
 }
 
-- 
1.8.3.1