Jorijn van der Graaf
eb13c18ea8
Charger-insertion boots (androidboot.mode=charger, ABL-appended) divert to a minimal charging.target instead of the full UI, ending the dead-battery bootloop: ADSP charging/USB-PD runs, splash+panel killed ~6-10s in via an initramfs hook, modem+cdsp stopped, radios/sensors suppressed, CPU capped. Power key reboots to a normal boot, volume-up shows battery status, volume-down enables USB ssh, unplug powers off. Measured >= breakeven on a 100mA-classified SDP port, strongly net-positive on real chargers. Suspend duty-cycling (~13mA floor) exists behind an off-by-default flag: resume from deep suspend intermittently kills the UFS link (hibern8 exit failed ret=5) - do not enable until that kernel bug is fixed. Byte-identical to the deployment verified on the dev phone 2026-08-24 (journal/power: r5 armed tests, crash autopsies, measurements). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
167 lines
6.8 KiB
Shell
Executable file
167 lines
6.8 KiB
Shell
Executable file
#!/bin/sh
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# Offline charging monitor (prototype r3). Runs only inside charging.target.
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#
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# - waits for the ADSP-backed battmgr supplies (charging + USB-PD live on
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# the ADSP, which never sleeps — AP suspend does not touch the PD contract)
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# - blanks + powers down the display pipeline, stops modem/cdsp remoteprocs,
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# caps CPU frequency, nudges UFS auto-hibernate
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# - unplug -> orderly poweroff (debounced ~6 s; a poweroff while plugged
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# re-wakes via the USB_CHARGER PON trigger)
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# - power key -> logind reboots to a NORMAL boot (generator drop-in)
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# - suspend cycling (rock-bottom mode): only when /etc/charging-mode/
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# enable-suspend exists AND ssh debug mode is off (/run/charging-mode-ssh,
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# volume-down) AND the status display is off (/run/charging-mode-display,
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# volume-up toggle). Arms an RTC wakealarm before every suspend and never
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# suspends without a verified alarm.
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#
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# Deliberately NO rfkill anywhere: systemd-rfkill would persist a soft-block
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# into normal boots (the 2026-08-23 wifi trap).
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#
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# Failsafe: if battmgr never appears, reboot — that PONs as HARD_RESET, so
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# the phone comes back in a NORMAL boot and is never stuck dark.
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BAT=/sys/class/power_supply/qcom-battmgr-bat
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USB=/sys/class/power_supply/qcom-battmgr-usb
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WAKEALARM=/sys/class/rtc/rtc0/wakealarm
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SUSPEND_SECS=45
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log() { echo "charging-monitor: $*"; }
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log "offline charging mode active (prototype r5)"
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i=0
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while [ ! -r "$USB/online" ]; do
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i=$((i + 1))
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if [ "$i" -gt 180 ]; then
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log "battmgr never appeared after ${i}s - failsafe reboot to normal boot"
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exec systemctl reboot
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fi
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sleep 1
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done
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log "battmgr up after ${i}s"
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for b in /sys/class/backlight/*/brightness; do
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[ -w "$b" ] && echo 0 > "$b" 2>/dev/null
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done
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log "panel blanked"
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# release the boot splash and power the display pipeline down (best effort —
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# brightness 0 alone leaves the DSI/DPU scanning out a black frame)
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if command -v plymouth >/dev/null 2>&1 && plymouth --ping 2>/dev/null; then
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plymouth quit 2>/dev/null && log "plymouth quit"
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fi
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for f in /sys/class/graphics/fb*/blank; do
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[ -w "$f" ] || continue
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{ echo 4 > "$f" || echo 1 > "$f"; } 2>/dev/null && log "fb powerdown via $f"
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done
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# radios/compute are pointless while charging — stop modem and cdsp
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# remoteprocs (adsp stays: it IS the charger; wpss left alone near the
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# WCN-combo trap). The stop write can block past a short timeout yet still
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# succeed — judge by the resulting state, not the write's exit code.
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for r in /sys/class/remoteproc/remoteproc*; do
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name=$(cat "$r/name" 2>/dev/null)
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case "$name" in
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*mpss*|*modem*|*mss*|*cdsp*)
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timeout 25 sh -c "echo stop > '$r/state'" 2>/dev/null
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if [ "$(cat "$r/state" 2>/dev/null)" = "offline" ]; then
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log "stopped remoteproc $name"
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else
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log "remoteproc $name did not stop (state=$(cat "$r/state" 2>/dev/null)) - continuing"
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fi
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;;
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esac
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done
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# cap CPU frequency to the minimum, then offline every core except cpu0
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# (a little @ 441.6 MHz) — emptying the two big clusters (cpu4-6, cpu7)
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# lets their cluster rails power-collapse entirely. Charging mode always
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# ends in a reboot, so no undo needed.
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for p in /sys/devices/system/cpu/cpufreq/policy*; do
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cat "$p/cpuinfo_min_freq" > "$p/scaling_max_freq" 2>/dev/null
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done
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for c in /sys/devices/system/cpu/cpu[1-9]*; do
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[ -w "$c/online" ] && echo 0 > "$c/online" 2>/dev/null
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done
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log "cpu freq capped to min, online cpus: $(cat /sys/devices/system/cpu/online 2>/dev/null)"
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# NOTE: do NOT touch UFS auto_hibern8 — the 2026-08-24 PD-boot crash
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# (ufshcd hibern8 exit failed, dead rootfs at t=34s) happened with our
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# auto_hibern8=5000 write + suspend-thrash; the write is the prime suspect
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# and its benefit was never measured.
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# battmgr power_supply events are wakeup sources, and a PPS charger streams
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# telemetry ~1/s — that turned suspend cycling into 1.2 s suspend-thrash on
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# the PD brick. Drop the psy wakeup flags: the RTC alarm is our only
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# intended waker (unplug is then detected at the next wake, <=45 s).
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for w in /sys/class/power_supply/qcom-battmgr-*/device/power/wakeup \
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/sys/class/power_supply/qcom-battmgr-*/power/wakeup; do
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[ -w "$w" ] && echo disabled > "$w" 2>/dev/null && log "wakeup disabled: $w"
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done
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suspend_enabled=false
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[ -e /etc/charging-mode/enable-suspend ] && suspend_enabled=true
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log "suspend cycling: $suspend_enabled (flag /etc/charging-mode/enable-suspend)"
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check_unplug() {
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# debounced: three reads ~3 s apart must all say offline
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n=0
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while [ "$(cat "$USB/online" 2>/dev/null || echo 1)" = "0" ]; do
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n=$((n + 1))
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if [ "$n" -ge 3 ]; then
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log "charger removed (capacity $(cat "$BAT/capacity" 2>/dev/null)%) - powering off"
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exec systemctl poweroff
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fi
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sleep 3
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done
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}
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sample() {
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log "sample: cap $(cat "$BAT/capacity" 2>/dev/null)% status $(cat "$BAT/status" 2>/dev/null) bat $(cat "$BAT/current_now" 2>/dev/null)uA cc $(cat "$BAT/charge_counter" 2>/dev/null)uAh usb $(cat "$USB/voltage_now" 2>/dev/null)uV $(cat "$USB/current_now" 2>/dev/null)uA icl $(cat "$USB/input_current_limit" 2>/dev/null)uA online $(cat "$USB/online" 2>/dev/null)"
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}
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suspending() {
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$suspend_enabled && [ ! -e /run/charging-mode-ssh ] && [ ! -e /run/charging-mode-display ]
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}
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tick=0
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thrash=0
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while :; do
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check_unplug
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# when suspend-cycling, log a full sample at EVERY wake — the persistent
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# journal is the offline logger for charger tests where no ssh path
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# exists (e.g. the PD brick occupying the USB port); in awake mode log
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# once a minute
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if suspending || [ $((tick % 12)) -eq 0 ]; then
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sample
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fi
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tick=$((tick + 1))
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if suspending && [ -w "$WAKEALARM" ]; then
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echo 0 > "$WAKEALARM" 2>/dev/null
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echo "+$SUSPEND_SECS" > "$WAKEALARM" 2>/dev/null
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if [ -n "$(cat "$WAKEALARM" 2>/dev/null)" ]; then
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t0=$(date +%s)
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echo mem > /sys/power/state 2>/dev/null || { log "suspend write failed - falling back to sleep"; sleep 30; }
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dur=$(( $(date +%s) - t0 ))
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log "slept ${dur}s"
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# thrash guard: instant resumes back-to-back nearly killed UFS
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# on the PD brick (2026-08-24) — three short cycles in a row
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# means something wakes us constantly; stop suspending and stay
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# in awake mode (still fine: any real charger out-supplies it)
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if [ "$dur" -lt 10 ]; then
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thrash=$((thrash + 1))
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if [ "$thrash" -ge 3 ]; then
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log "suspend thrash (3 consecutive <10s cycles) - disabling suspend cycling this session"
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suspend_enabled=false
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fi
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else
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thrash=0
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fi
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else
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log "could not arm RTC wakealarm - NOT suspending (sleep fallback)"
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sleep 30
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fi
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else
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sleep 5
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fi
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done
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