linux: bypass charging on SM8750#2840
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Add an SM8750 kernel patch exposing the firmware's USB power-path bypass
through the standard POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR interface on the
sm8550 battmgr variant:
/sys/class/power_supply/battery/charge_behaviour
auto -> charge normally
inhibit-charge -> run from the adapter, leave the battery untouched
The GLINK request reuses qcom_battmgr's existing property helper; only the
opcode (USB_PROPERTY_SET) and property id (14, the vendor 'usb_charge_now'
control) differ. Reverse-engineered from the AYN Odin 3 Android charger
driver (qti_battery_charger) and verified on-device: with inhibit-charge
and the charger online, battery status -> Discharging / current ~0.
The patch is self-contained (only the sm8550 battery psy) and applies to
mainline qcom_battmgr.c unchanged, so it is submittable upstream as-is.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Summary
Expose the SM8750 (AYN Odin 3) charger firmware's USB power-path
bypass through the standard POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR
interface on the sm8550 battmgr variant:
/sys/class/power_supply/battery/charge_behaviour
auto -> charge the battery normally
inhibit-charge -> run from the adapter, battery untouched
Reverse-engineered from the Odin 3 Android charger driver
(qti_battery_charger) and verified on-device: with inhibit-charge
and the charger online, battery status goes to Discharging and
current to ~0 while the input stays online.
The change is confined to the sm8550 battery psy, so other battmgr
variants are unaffected.
AI Usage
While ROCKNIX doesn't have restrictions on AI tools in contributing, please be transparent about their usage as it
helps set the right context for reviewers.
Did you use AI tools to help write this code? YES