Merge tag 'for-v3.8-merged' of git://git.infradead.org/battery-2.6

Pull battery subsystem updates from Anton Vorontsov:
 "Highlights:

   - Two new drivers from Pali Rohár and N900 hackers: rx51_battery and
     bq2415x_charger.  The drivers are a part of a solution to replace
     the proprietary Nokia BME stack

   - Power supply core now registers devices with a thermal cooling
     subsystem, so we can now automatically throttle charging.  Thanks
     to Ramakrishna Pallala!

   - Device tree support for ab8500 and max8925_power drivers

   - Random fixups and enhancements for a bunch of drivers."

* tag 'for-v3.8-merged' of git://git.infradead.org/battery-2.6: (22 commits)
  max8925_power: Add support for device-tree initialization
  ab8500: Add devicetree support for chargalg
  ab8500: Add devicetree support for charger
  ab8500: Add devicetree support for btemp
  ab8500: Add devicetree support for fuelgauge
  twl4030_charger: Change TWL4030_MODULE_* ids to TWL_MODULE_*
  jz4740-battery: Use devm_request_and_ioremap
  jz4740-battery: Use devm_kzalloc
  bq27x00_battery: Fixup nominal available capacity reporting
  bq2415x_charger: Fix style issues
  bq2415x_charger: Add Kconfig/Makefile entries
  power_supply: Add bq2415x charger driver
  power_supply: Add new Nokia RX-51 (N900) power supply battery driver
  max17042_battery: Fix missing verify_model_lock() return value check
  ds2782_battery: Fix signedness bug in ds278x_read_reg16()
  lp8788-charger: Fix ADC channel names
  lp8788-charger: Fix wrong ADC conversion
  lp8788-charger: Use consumer device name on setting IIO channels
  power_supply: Register power supply for thermal cooling device
  power_supply: Add support for CHARGE_CONTROL_* attributes
  ...

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index e0edaf7de54..36b34efdafc 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);
 }