46 lines
1.8 KiB
Diff
46 lines
1.8 KiB
Diff
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From fa898d9eee5dd77af8d536ad85351f80fb3c41a0 Mon Sep 17 00:00:00 2001
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From: Henrik Grimler <henrik@grimler.se>
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Date: Mon, 13 Sep 2021 11:30:16 +0200
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Subject: [PATCH 08/10] power: supply: max17042_battery: use VFSOC for capacity
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when no rsns
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On Galaxy S3 (i9300/i9305), which has the max17047 fuel gauge and no
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current sense resistor (rsns), the RepSOC register does not provide an
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accurate state of charge value. The reported value is wrong, and does
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not change over time. VFSOC however, which uses the voltage fuel gauge
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to determine the state of charge, always shows an accurate value.
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At least one max170xx driver, found in Asus' Z00D kernel [1], chooses
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how to get the capacity based on if current sense is available or not.
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Lets change the mainline driver to match the Asus Z00D driver's
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behaviour and thereby fix so that correct state of charge values are
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obtained on Galaxy S3.
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[1] https://github.com/LineageOS/android_kernel_asus_Z00D/blob/c7ab0e3ec5b5/drivers/power/max17042_battery.c#L1103-L1105
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Suggested-by: Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de>
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Signed-off-by: Henrik Grimler <henrik@grimler.se>
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---
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drivers/power/supply/max17042_battery.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/drivers/power/supply/max17042_battery.c b/drivers/power/supply/max17042_battery.c
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index 8dffae76b6a3..5809ba997093 100644
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--- a/drivers/power/supply/max17042_battery.c
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+++ b/drivers/power/supply/max17042_battery.c
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@@ -313,7 +313,10 @@ static int max17042_get_property(struct power_supply *psy,
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val->intval = data * 625 / 8;
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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- ret = regmap_read(map, MAX17042_RepSOC, &data);
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+ if (chip->pdata->enable_current_sense)
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+ ret = regmap_read(map, MAX17042_RepSOC, &data);
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+ else
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+ ret = regmap_read(map, MAX17042_VFSOC, &data);
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if (ret < 0)
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return ret;
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--
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2.33.0
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