linux-kernel - [PATCH] hwmon: gsc-hwmon: scale temperature to millidegrees

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Message-Id: <1598548824-16898-1-git-send-email-tharvey@gateworks.com>
Date:   Thu, 27 Aug 2020 10:20:24 -0700
From:   Tim Harvey <tharvey@...eworks.com>
To:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     Robert Jones <rjones@...eworks.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tim Harvey <tharvey@...eworks.com>,
        stable@...r.kernel.org
Subject: [PATCH] hwmon: gsc-hwmon: scale temperature to millidegrees

The GSC registers report temperature in decidegrees celcius so we
need to scale it to represent the hwmon sysfs API of millidegrees.

Cc: stable@...r.kernel.org
Signed-off-by: Tim Harvey <tharvey@...eworks.com>
---
 drivers/hwmon/gsc-hwmon.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hwmon/gsc-hwmon.c b/drivers/hwmon/gsc-hwmon.c
index 3dfe2ca..c6d4567 100644
--- a/drivers/hwmon/gsc-hwmon.c
+++ b/drivers/hwmon/gsc-hwmon.c
@@ -172,6 +172,7 @@ gsc_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
 	case mode_temperature:
 		if (tmp > 0x8000)
 			tmp -= 0xffff;
+		tmp *= 100; /* convert to millidegrees celsius */
 		break;
 	case mode_voltage_raw:
 		tmp = clamp_val(tmp, 0, BIT(GSC_HWMON_RESOLUTION));
-- 
2.7.4