From 223a3b82834f036a62aa831f67cbf1f1d644c6e2 Mon Sep 17 00:00:00 2001
From: Henrik Grimler <henrik@grimler.se>
Date: Wed, 29 Sep 2021 20:14:17 +0200
Subject: [PATCH] power: supply: max17042_battery: use VFSOC for capacity when no rsns
Git-commit: 223a3b82834f036a62aa831f67cbf1f1d644c6e2
Patch-mainline: v5.16-rc1
References: git-fixes stable-5.14.19
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>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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;
--
2.26.2