1#!/bin/bash
2# Copyright 2021 Google LLC
3#
4# Licensed under the Apache License, Version 2.0 (the "License");
5# you may not use this file except in compliance with the License.
6# You may obtain a copy of the License at
7#
8#      http://www.apache.org/licenses/LICENSE-2.0
9#
10# Unless required by applicable law or agreed to in writing, software
11# distributed under the License is distributed on an "AS IS" BASIS,
12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13# See the License for the specific language governing permissions and
14# limitations under the License.
15
16# shellcheck source=meta-google/recipes-google/gpio/gpio-ctrl/lib.sh
17source /usr/share/gpio-host-pwr/lib.sh || exit
18
19gpio_build_cache 10 "$HOST_GPIO_PGOOD" "$HOST_GPIO_PWR_BTN" || exit
20gpio_init "$HOST_GPIO_PGOOD" || exit
21
22# Set the power status LED
23if [ -n "$HOST_LED_PWR" ]; then
24  echo 'none' > /sys/class/leds/"$HOST_LED_PWR"/trigger || true
25  echo '255' > /sys/class/leds/"$HOST_LED_PWR"/brightness || true
26fi
27
28# Ensure the watchdog is available before the host starts
29host_pwr_start_watchdog || true
30
31# We don't want to do anything if the machine is already on
32pgood="$(gpio_get_value "$HOST_GPIO_PGOOD")" || exit
33if (( pgood == 1 )); then
34  echo 'Host is already running, doing nothing' >&2
35  exit 0
36fi
37
38# Do a quick push of the button if PGOOD
39echo "Starting host power" >&2
40rc=0
41gpio_set_value "$HOST_GPIO_PWR_BTN" 1 || rc=$?
42sleep 0.1
43gpio_set_value "$HOST_GPIO_PWR_BTN" 0 || rc=$?
44
45# Loop until we realize that host power is on
46# Limit the loop count to 10 seconds as we should never
47# have to wait this long for poweroff
48s=$SECONDS
49while true; do
50  if ! pgood="$(gpio_get_value "$HOST_GPIO_PGOOD")"; then
51    rc=1
52    break
53  fi
54  if (( pgood == 1 )); then
55    echo 'Host is now on' >&2
56    break
57  fi
58  if (( SECONDS - s > 10 )); then
59    echo 'Poweron timed out, terminating' >&2
60    rc=2
61    break
62  fi
63  sleep 0.1
64done
65
66exit $rc
67