power_manager/init/powerd.conf

# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

description   "Start the Chromium OS power daemon"
author        "chromium-os-dev@chromium.org"

# Note, the 'start on' line is modified by chromeos-factoryinstall ebuild.
# Please do not change it without also changing that reference.
start on started boot-services
stop on stopping boot-services
respawn
respawn limit 3 10  # if the job respawns 3 times in 10 seconds, stop trying.

env LOG_DIR=/var/log/power_manager
env POWER_RUN_DIR=/var/run/power_manager/power
env PREFS_DIR=/var/lib/power_manager
env ROOT_RUN_DIR=/var/run/power_manager/root
env ROOT_SPOOL_DIR=/var/spool/power_manager/root
env DEFAULT_PREFS_DIR=/usr/share/power_manager
env VPD_CACHE_FILE=/mnt/stateful_partition/unencrypted/cache/vpd/filtered.txt
env MAX_NITS_PREF=internal_backlight_max_nits
env PM_TEST_DELAY_FILE=/sys/power/pm_test_delay

# Add modules here in --vmodule format for debugging.
env VMODULE_ARG=

pre-start script
  mkdir -p ${LOG_DIR} ${POWER_RUN_DIR} ${PREFS_DIR}
  chown -R power:power ${LOG_DIR} ${POWER_RUN_DIR} ${PREFS_DIR}
  chmod 755 ${LOG_DIR} ${POWER_RUN_DIR} ${PREFS_DIR}

  mkdir -p ${ROOT_RUN_DIR} ${ROOT_SPOOL_DIR}

  # Read the real maximum backlight luminance (i.e. not the value reported by
  # the driver) from VPD and pass it to powerd via a pref file.
  if [ -e "${VPD_CACHE_FILE}" ]; then
    MAX_NITS=$(sed -nre 's/^"panel_backlight_max_nits"="(.+)"$/\1/p' \
      <"${VPD_CACHE_FILE}")
    if [ -n "${MAX_NITS}" ]; then
      TEMP_FILE="$(mktemp --tmpdir powerd_nits.XXXXXXXXXX)"
      echo "${MAX_NITS}" >"${TEMP_FILE}"
      PREF_FILE="${PREFS_DIR}/${MAX_NITS_PREF}"
      mv "${TEMP_FILE}" "${PREF_FILE}"
      chown power:power "${PREF_FILE}"
      chmod 644 "${PREF_FILE}"
    fi
  fi

  # Change ownership of files used by powerd.
  for FILE in \
      /sys/power/pm_test \
      /sys/power/state \
      /proc/acpi/wakeup \
      /sys/class/backlight/*/* \
      /sys/class/leds/*:kbd_backlight/* \
      /sys/class/power_supply/*/charge_control_limit_max \
      $(find /sys/devices/ -name "dark_resume_active" -o \
                           -name "dark_resume_source" -o \
                           -name "wakeup_type" -o \
                           -path "*/power/wakeup"); do
    # Test for existence to skip over wildcards that didn't match anything.
    if [ -e "${FILE}" ]; then
      chown power:power "${FILE}" || true
    fi
  done

  # Prepare for recovery from dark resume to a full resume.  TODO(chirantan):
  # Remove this when selective resume is ready.
  if [ -e "${PM_TEST_DELAY_FILE}" ]; then
     # Wait for 5 milliseconds before starting the resume.
     echo 5 > "${PM_TEST_DELAY_FILE}"
  fi
end script

# Note that we need the full path to powerd because minijail doesn't look
# at $PATH.  Also, do not set capabilities here using minijail0's -c flag;
# doing so will prevent powerd_setuid_helper from running correctly when
# executed by powerd.
exec minijail0 -u power -g power -G --        \
  /usr/bin/powerd                             \
    --prefs_dir=${PREFS_DIR}                  \
    --default_prefs_dir=${DEFAULT_PREFS_DIR}  \
    --log_dir=${LOG_DIR}                      \
    --run_dir=${POWER_RUN_DIR}                \
    --vmodule="${VMODULE_ARG}"                \
    >/var/log/powerd.out 2>&1