bq27x00_battery: Fix reporting battery temperature

Reported temperature can be also negative, so cache value in non negative
Kelvin degree.

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>

1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index 7087d0d6a087..8ccf5d7d0add 100644
--- a/drivers/power/bq27x00_battery.c
+++ b/drivers/power/bq27x00_battery.c
@@ -299,7 +299,7 @@ static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
 }
 
 /*
- * Return the battery temperature in tenths of degree Celsius
+ * Return the battery temperature in tenths of degree Kelvin
  * Or < 0 if something fails.
  */
 static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
@@ -312,10 +312,8 @@ static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
                 return temp;
         }
 
-        if (bq27xxx_is_chip_version_higher(di))
-                temp -= 2731;
-        else
-                temp = ((temp * 5) - 5463) / 2;
+        if (!bq27xxx_is_chip_version_higher(di))
+                temp = 5 * temp / 2;
 
         return temp;
 }
@@ -641,6 +639,8 @@ static int bq27x00_battery_get_property(struct power_supply *psy,
                 break;
         case POWER_SUPPLY_PROP_TEMP:
                 ret = bq27x00_simple_value(di->cache.temperature, val);
+                if (ret == 0)
+                        val->intval -= 2731;
                 break;
         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
                 ret = bq27x00_simple_value(di->cache.time_to_empty, val);