bq27x00_battery: Fixup nominal available capacity reporting

We should not not report nominal available capacity if battery is not
calibrated, as we don't want to represent bogus values in the sysfs and
confuse userland.

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

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index 5860d4dfbe9c..41b3328ecfc5 100644
--- a/drivers/power/bq27x00_battery.c
+++ b/drivers/power/bq27x00_battery.c
@@ -230,6 +230,14 @@ static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
  */
 static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
 {
+        int flags;
+        bool is_bq27500 = di->chip == BQ27500;
+        bool is_higher = bq27xxx_is_chip_version_higher(di);
+
+        flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
+        if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
+                return -ENODATA;
+
         return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
 }