linux-kernel - [PATCH 5.8 167/255] hwmon: (gsc-hwmon) Scale temperature to millidegrees

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Message-Id: <20200901151008.696784793@linuxfoundation.org>
Date:   Tue,  1 Sep 2020 17:10:23 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tim Harvey <tharvey@...eworks.com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 5.8 167/255] hwmon: (gsc-hwmon) Scale temperature to millidegrees

From: Tim Harvey <tharvey@...eworks.com>

commit c1ae18d313e24bc7833e1749dd36dba5d47f259c upstream.

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
Fixes: 3bce5377ef66 ("hwmon: Add Gateworks System Controller support")
Signed-off-by: Tim Harvey <tharvey@...eworks.com>
Link: https://lore.kernel.org/r/1598548824-16898-1-git-send-email-tharvey@gateworks.com
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hwmon/gsc-hwmon.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/hwmon/gsc-hwmon.c
+++ b/drivers/hwmon/gsc-hwmon.c
@@ -172,6 +172,7 @@ gsc_hwmon_read(struct device *dev, enum
 	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));