On Galaxy S3 (i9300/i9305), which has the max17047 fuel gauge and no current sense resistor (rsns), the RepSOC register does not provide an accurate state of charge value. The reported value is wrong, and does not change over time. VFSOC however, which uses the voltage fuel gauge to determine the state of charge, always shows an accurate value.
For devices without current sense, VFSOC is already used for the soc-alert (0x0003 is written to MiscCFG register), so with this change the source of the alert and the PROP_CAPACITY value match.
Fixes: 359ab9f5b154 ("power_supply: Add MAX17042 Fuel Gauge Driver") Cc: stable@vger.kernel.org Reviewed-by: Krzysztof Kozlowski krzysztof.kozlowski@canonical.com Suggested-by: Wolfgang Wiedmeyer wolfgit@wiedmeyer.de Signed-off-by: Henrik Grimler henrik@grimler.se --- Changes in v2: Re-write commit message to highlight that VFSOC is already used for alert, after Krzysztof's comments --- drivers/power/supply/max17042_battery.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/power/supply/max17042_battery.c b/drivers/power/supply/max17042_battery.c index 8dffae76b6a3..5809ba997093 100644 --- a/drivers/power/supply/max17042_battery.c +++ b/drivers/power/supply/max17042_battery.c @@ -313,7 +313,10 @@ static int max17042_get_property(struct power_supply *psy, val->intval = data * 625 / 8; break; case POWER_SUPPLY_PROP_CAPACITY: - ret = regmap_read(map, MAX17042_RepSOC, &data); + if (chip->pdata->enable_current_sense) + ret = regmap_read(map, MAX17042_RepSOC, &data); + else + ret = regmap_read(map, MAX17042_VFSOC, &data); if (ret < 0) return ret;
base-commit: 5816b3e6577eaa676ceb00a848f0fd65fe2adc29