Add LTC2941/LTC2943 Battery Gauge Driver

Both the LTC2941 and LTC2943 measure battery capacity.
The LTC2943 is compatible with the LTC2941, it adds voltage and
temperature monitoring, and uses a slightly different conversion
formula for the charge counter.

To avoid confusion with e.g. the LTC2945, the driver is called
LTC2941 instead of LTC294X.

v2: Fix units of measurement: uV, uA and centidegrees.
v3: Correctly set configuration register. Allow negative values
    for the sense resistor.
v4: Run checkpatch.pl and fix all errors and warnings.
v5: Prefix "lltc," to devicetree properties.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
[ removed .owner field ]
Signed-off-by: Sebastian Reichel <sre@kernel.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index a79f16afb588..27b751b995fb 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -388,6 +388,14 @@ config CHARGER_TPS65090
          Say Y here to enable support for battery charging with TPS65090
          PMIC chips.
 
+config BATTERY_GAUGE_LTC2941
+        tristate "LTC2941/LTC2943 Battery Gauge Driver"
+        depends on I2C
+        help
+          Say Y here to include support for LTC2941 and LTC2943 Battery
+          Gauge IC. The driver reports the charge count continuously, and
+          measures the voltage and temperature every 10 seconds.
+
 config AB8500_BM
         bool "AB8500 Battery Management Driver"
         depends on AB8500_CORE && AB8500_GPADC