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@vger.kernel.org Signed-off-by: Lubomir Rintel lkundrak@v3.sk Acked-by: Pavel Machek pavel@ucw.cz
--- Changes since v1: - Add Fixes tag and an Ack
drivers/power/supply/olpc_battery.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c index 6da79ae14860..5a97e42a3547 100644 --- a/drivers/power/supply/olpc_battery.c +++ b/drivers/power/supply/olpc_battery.c @@ -428,14 +428,14 @@ static int olpc_bat_get_property(struct power_supply *psy, 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);