linux-kernel - [PATCH v2] hwmon: (scpi-hwmon) shows the negative temperature properly

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Message-Id: <20210603083845.569751-1-luriwen@kylinos.cn>
Date:   Thu,  3 Jun 2021 16:38:45 +0800
From:   Riwen Lu <luriwen@...inos.cn>
To:     jdelvare@...e.com, linux@...ck-us.net
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        Riwen Lu <luriwen@...inos.cn>, Xin Chen <chenxin@...inos.cn>
Subject: [PATCH v2] hwmon: (scpi-hwmon) shows the negative temperature properly

The scpi hwmon shows the sub-zero temperature in an unsigned integer,
which would confuse the users when the machine works in low temperature
environment. This shows the sub-zero temperature in an signed value and
users can get it properly from sensors.

Signed-off-by: Riwen Lu <luriwen@...inos.cn>
Tested-by: Xin Chen <chenxin@...inos.cn>

---
Changes since v1:
- Add judgment for sensor->info.class. If it is TEMPERATURE situation,
  return the sensor value as a signed value, otherwise return it as a
  unsigned value.
---
 drivers/hwmon/scpi-hwmon.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/scpi-hwmon.c b/drivers/hwmon/scpi-hwmon.c
index 25aac40f2764..45a7e319143d 100644
--- a/drivers/hwmon/scpi-hwmon.c
+++ b/drivers/hwmon/scpi-hwmon.c
@@ -99,7 +99,10 @@ scpi_show_sensor(struct device *dev, struct device_attribute *attr, char *buf)
 
 	scpi_scale_reading(&value, sensor);
 
-	return sprintf(buf, "%llu\n", value);
+	if (sensor->info.class == TEMPERATURE)
+		return sprintf(buf, "%lld\n", value);
+	else
+		return sprintf(buf, "%llu\n", value);
 }
 
 static ssize_t
-- 
2.25.1


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