4b54fc7f83
Provide a rough battery capacity estimation for the bq27200 fuel gauge inside Nokia N900. This is useful when the fuel gauge is out of calibration and a learning cycle cannot take place due to broken USB/charging port on the device. [ci:skip-build]: Already built successfully in CI
42 lines
1.8 KiB
Diff
42 lines
1.8 KiB
Diff
From 350df21c4f01137e3d29f445e36aeb6c82b85e34 Mon Sep 17 00:00:00 2001
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From: "Sicelo A. Mhlongo" <absicsz@gmail.com>
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Date: Mon, 11 Sep 2023 10:34:54 +0200
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Subject: [PATCH 1/2] bq27xxx_battery: map edv1 to low battery capacity
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EDV1 is the most reliable indicator for battery low state on the N900/bq27200,
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and the driver already exposes it in the POWER_SUPPLY_PROP_CAPACITY_LEVEL (Low)
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and POWER_SUPPLY_PROP_HEALTH (Dead) properties. However, most userspace,
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including upower, does not use these properties for decision-making. Map EDV1
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state to very low battery capacity to force userspace to act on EDV1.
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Signed-off-by: Sicelo A. Mhlongo <absicsz@gmail.com>
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---
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drivers/power/supply/bq27xxx_battery.c | 12 +++++++++++-
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1 file changed, 11 insertions(+), 1 deletion(-)
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diff --git a/drivers/power/supply/bq27xxx_battery.c b/drivers/power/supply/bq27xxx_battery.c
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index 4296600e8912..0789061ae9a0 100644
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--- a/drivers/power/supply/bq27xxx_battery.c
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+++ b/drivers/power/supply/bq27xxx_battery.c
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@@ -1851,7 +1851,17 @@ static void bq27xxx_battery_update_unlocked(struct bq27xxx_device_info *di)
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cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
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cache.charge_full = bq27xxx_battery_read_fcc(di);
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- cache.capacity = bq27xxx_battery_read_soc(di);
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+
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+ /* HACK: If EDV1 flag is set, force capacity to report 1%, even though
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+ * SEDV1 actually represents about 6.25%, per datasheet. This is to ensure
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+ * that userspace, such as upower, can readily react to the true battery low
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+ * state (EDV1 set) whether or not the reported SoC value is reliable.
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+ */
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+ if (cache.flags & BQ27000_FLAG_EDV1)
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+ cache.capacity = 1;
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+ else
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+ cache.capacity = bq27xxx_battery_read_soc(di);
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+
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if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
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cache.energy = bq27xxx_battery_read_energy(di);
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di->cache.flags = cache.flags;
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--
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2.40.1
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