batteryplus: snap the visible percent on resume in PMIC mode

[Jacob-Matthew-Cook]

Summary

• What is the goal of this PR? Make batteryplus show the kernel's post-sleep battery value in PMIC mode. The daemon's long-gap snap only exists in voltage mode; in PMIC mode a resume goes through the step limiter, one point at a time and never counting down while charging, so a kernel gauge that corrected itself across a sleep stays hidden from the UI. Snap to the kernel value whenever a resume is detected (SIGUSR1 or a ≥15 min loop gap). Patch on the upstream daemon (Mikhailzrick/knubat.components), upstream candidate.

Testing

• How was this tested? RG353M (RK817, PMIC mode). Failure reproduced first: after a 10 h unplugged sleep the kernel corrected 88 % → 63 % at wake while /tmp/battery.percent, and so ES, stayed at 87 % because the device woke on the charger. Fixed daemon run in place of the stock one, then a built image with the patch.
• Test results: 19 min sleep on a charger from 71 %: kernel 85 % at wake, ES header 85 % within seconds of waking, /tmp/battery.percent tracking the kernel afterwards. Restart of the daemon with a stale value also resyncs immediately.
• Artifacts: none published; tested from a local build on the RG353M.

Additional Context

• PMIC mode is what a device with batteryplus "disabled" actually runs, and ES reads /tmp/battery.percent, so this affects every RK817 handheld with BATTERYPLUS_SUPPORT regardless of the setting.
• Split out of RK3326/RK3566/H700: battery, SD card and suspend/resume fixes #3220 (it was briefly carried there as 896400c).
• @porschemad911 — could you take a look?

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AI Usage

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[Jacob-Matthew-Cook]

@porschemad911 ready for review — small batteryplus patch, validated on the RG353M (details in the description). #3324 is the companion for the RK3566 sleep drain.

[porschemad911]

@Jacob-Matthew-Cook are you going to open a PR to https://github.com/Mikhailzrick/knubat.components with these changes?

Edit: Also for the changes in https://github.com/ROCKNIX/distribution/blob/next/projects/ROCKNIX/packages/tools/batteryplus/patches/0001-discover-voltage_avg-fallback.patch

[Jacob-Matthew-Cook]

@porschemad911 Opened upstream with both (
PR#3220’s change and this as separate commits: Mikhailzrick/knubat.components#1 (voltage_avg discovery fallback + this PMIC-mode resume snap). Once it lands, both ROCKNIX patches can be dropped and the pin bumped.