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power: supply: max17047_battery: The temp alert values are 8-bit 2's complement

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The temp alert values are 8-bit 2's complement, so sign-extend them
before reporting them back to the caller.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Hans de Goede 2017-04-14 20:32:48 +02:00 • committed by Sebastian Reichel
parent c67c06939e
commit 2814913c31
1 changed files with 2 additions and 2 deletions
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4
drivers/power/supply/max17042_battery.c
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@ -270,14 +270,14 @@ static int max17042_get_property(struct power_supply *psy,
if (ret < 0) if (ret < 0)
return ret; return ret;
/* LSB is Alert Minimum. In deci-centigrade */ /* LSB is Alert Minimum. In deci-centigrade */
val->intval = (data & 0xff) * 10; val->intval = sign_extend32(data & 0xff, 7) * 10;
break; break;
case POWER_SUPPLY_PROP_TEMP_ALERT_MAX: case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
ret = regmap_read(map, MAX17042_TALRT_Th, &data); ret = regmap_read(map, MAX17042_TALRT_Th, &data);
if (ret < 0) if (ret < 0)
return ret; return ret;
/* MSB is Alert Maximum. In deci-centigrade */ /* MSB is Alert Maximum. In deci-centigrade */
val->intval = (data >> 8) * 10; val->intval = sign_extend32(data >> 8, 7) * 10;
break; break;
case POWER_SUPPLY_PROP_TEMP_MIN: case POWER_SUPPLY_PROP_TEMP_MIN:
val->intval = chip->pdata->temp_min; val->intval = chip->pdata->temp_min;