linux-kernel - [PATCH 4.9 62/63] power: supply: olpc_battery: correct the temperature units

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Message-Id: <20190111131056.301929791@linuxfoundation.org>
Date:   Fri, 11 Jan 2019 15:15:05 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lubomir Rintel <lkundrak@...sk>,
        Pavel Machek <pavel@....cz>,
        Sebastian Reichel <sebastian.reichel@...labora.com>
Subject: [PATCH 4.9 62/63] power: supply: olpc_battery: correct the temperature units

4.9-stable review patch.  If anyone has any objections, please let me know.

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

From: Lubomir Rintel <lkundrak@...sk>

commit ed54ffbe554f0902689fd6d1712bbacbacd11376 upstream.

According to [1] and [2], the temperature values are in tenths of degree
Celsius. Exposing the Celsius value makes the battery appear on fire:

  $ upower -i /org/freedesktop/UPower/devices/battery_olpc_battery
  ...
      temperature:         236.9 degrees C

Tested on OLPC XO-1 and OLPC XO-1.75 laptops.

[1] include/linux/power_supply.h
[2] Documentation/power/power_supply_class.txt

Fixes: fb972873a767 ("[BATTERY] One Laptop Per Child power/battery driver")
Cc: stable@...r.kernel.org
Signed-off-by: Lubomir Rintel <lkundrak@...sk>
Acked-by: Pavel Machek <pavel@....cz>
Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/power/supply/olpc_battery.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/power/supply/olpc_battery.c
+++ b/drivers/power/supply/olpc_battery.c
@@ -427,14 +427,14 @@ static int olpc_bat_get_property(struct
 		if (ret)
 			return ret;
 
-		val->intval = (s16)be16_to_cpu(ec_word) * 100 / 256;
+		val->intval = (s16)be16_to_cpu(ec_word) * 10 / 256;
 		break;
 	case POWER_SUPPLY_PROP_TEMP_AMBIENT:
 		ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
 		if (ret)
 			return ret;
 
-		val->intval = (int)be16_to_cpu(ec_word) * 100 / 256;
+		val->intval = (int)be16_to_cpu(ec_word) * 10 / 256;
 		break;
 	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
 		ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2);