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>
111 lines
4 KiB
Shell
Executable file
111 lines
4 KiB
Shell
Executable file
#!/bin/sh
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# Charging-mode key handler (r4):
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# volume-down (pmic_resin) -> enable ssh debug mode (inhibits suspend)
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# volume-up (gpio-keys) -> toggle the on-screen battery status display
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# The display costs nothing while off: panel + pipeline stay powered down
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# and suspend cycling continues. While visible, /run/charging-mode-display
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# inhibits suspend (the monitor checks it); toggling off (or the safety
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# timeout) blanks everything again and cycling resumes.
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# The power key is taken (logind: reboot to normal boot).
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log() { echo "charging-keys: $*"; }
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BAT=/sys/class/power_supply/qcom-battmgr-bat
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USB=/sys/class/power_supply/qcom-battmgr-usb
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DISPLAY_MARKER=/run/charging-mode-display
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DISPLAY_TIMEOUT=600 # safety auto-off, seconds
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find_dev() {
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for e in /sys/class/input/event*; do
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n=$(cat "$e/device/name" 2>/dev/null)
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case "$n" in
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$1) echo "/dev/input/${e##*/}"; return 0 ;;
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esac
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done
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return 1
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}
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read_key() {
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# echoes the key code of a key RELEASE event (or nothing). Release, not
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# press: when a key wakes the phone from suspend, the press can be
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# consumed as the wake event while the release is still delivered — so
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# triggering on release works both awake and as a wake key.
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# input_event on arm64: u64 sec, u64 usec, u16 type, u16 code, s32 value
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# od -tu2 words: 1-8 time, 9 type, 10 code, 11-12 value (lo, hi)
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_d="$1"
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set -- $(dd if="$_d" bs=24 count=1 2>/dev/null | od -An -v -tu2)
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[ $# -ge 11 ] || return 1
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[ "$9" = "1" ] && [ "${11}" = "0" ] && echo "${10}"
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return 0
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}
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enable_ssh() {
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[ -e /run/charging-mode-ssh ] && return
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: > /run/charging-mode-ssh
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log "volume-down pressed: enabling usbnet+sshd, suspend cycling inhibited"
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systemctl start systemd-user-sessions.service charging-usbnet.service sshd.service
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}
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draw_status() {
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cap=$(cat "$BAT/capacity" 2>/dev/null)
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cur=$(cat "$BAT/current_now" 2>/dev/null)
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cc=$(cat "$BAT/charge_counter" 2>/dev/null)
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full=$(cat "$BAT/charge_full" 2>/dev/null)
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[ -n "$full" ] || full=4415000
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uv=$(cat "$USB/voltage_now" 2>/dev/null)
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ui=$(cat "$USB/current_now" 2>/dev/null)
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eta=$(awk -v f="$full" -v c="$cc" -v i="$cur" 'BEGIN {
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if (i > 10000) { h = (f - c) / i; printf "%dh%02dm", int(h), (h - int(h)) * 60 }
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else printf "--"
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}' 2>/dev/null)
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{
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printf '\033[2J\033[H\n\n'
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printf ' CHARGING %s%%\n\n' "$cap"
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printf ' battery %d mA\n' "$(( ${cur:-0} / 1000 ))"
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printf ' input %d mV %d mA\n' "$(( ${uv:-0} / 1000 ))" "$(( ${ui:-0} / 1000 ))"
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printf ' full in %s\n' "$eta"
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} > /dev/tty0 2>/dev/null
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}
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display_off() {
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rm -f "$DISPLAY_MARKER"
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printf '\033[2J\033[H' > /dev/tty0 2>/dev/null
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for b in /sys/class/backlight/*/brightness; do echo 0 > "$b" 2>/dev/null; done
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for f in /sys/class/graphics/fb*/blank; do { echo 4 > "$f" || echo 1 > "$f"; } 2>/dev/null; done
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log "status display OFF"
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}
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display_on() {
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: > "$DISPLAY_MARKER"
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log "volume-up pressed: status display ON"
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for f in /sys/class/graphics/fb*/blank; do echo 0 > "$f" 2>/dev/null; done
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for b in /sys/class/backlight/*/brightness; do echo 400 > "$b" 2>/dev/null; done
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(
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shown=0
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while [ -e "$DISPLAY_MARKER" ] && [ "$shown" -lt "$DISPLAY_TIMEOUT" ]; do
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draw_status
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sleep 5
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shown=$((shown + 5))
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done
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display_off
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) &
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}
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VOLDOWN_DEV=$(find_dev "*resin*")
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VOLUP_DEV=$(find_dev "gpio-keys")
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[ -n "$VOLDOWN_DEV" ] && log "volume-down (ssh) on $VOLDOWN_DEV" \
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|| log "no resin device - ssh enable unavailable this boot"
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[ -n "$VOLUP_DEV" ] && log "volume-up (display) on $VOLUP_DEV" \
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|| log "no gpio-keys device - status display unavailable this boot"
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if [ -n "$VOLDOWN_DEV" ]; then
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( while :; do [ "$(read_key "$VOLDOWN_DEV")" = "114" ] && enable_ssh; done ) &
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fi
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if [ -n "$VOLUP_DEV" ]; then
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( while :; do
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[ "$(read_key "$VOLUP_DEV")" = "115" ] || continue
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if [ -e "$DISPLAY_MARKER" ]; then display_off; else display_on; fi
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done ) &
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fi
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wait
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