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#!/bin/bash
# get fan state by d-bus command
function get_fan_state() {
get_property_path='xyz.openbmc_project.Sensor.Threshold.Critical CriticalAlarmLow'
fan_state="$(busctl get-property "$1" "$2" "$get_property_path" | awk '{print $2}')"
echo "$fan_state"
}
# set fan pwm by d-bus command
function set_fan_value() {
set_property_path='xyz.openbmc_project.Control.FanPwm'
busctl set-property "$1" "$2" $set_property_path Target t 255
}
fan_tach_path=( '/xyz/openbmc_project/sensors/fan_tach/Fan0_0_RPM'
'/xyz/openbmc_project/sensors/fan_tach/Fan0_1_RPM'
'/xyz/openbmc_project/sensors/fan_tach/Fan1_0_RPM'
'/xyz/openbmc_project/sensors/fan_tach/Fan1_1_RPM'
'/xyz/openbmc_project/sensors/fan_tach/Fan2_0_RPM'
'/xyz/openbmc_project/sensors/fan_tach/Fan2_1_RPM'
)
check_fail_flag=0
current_fan_state=()
while true; do
hwmon_path="$(mapper get-service "${fan_tach_path[0]}")"
for i in "${!fan_tach_path[@]}";
do
current_fan_state[i%2]=$(get_fan_state "$hwmon_path" "${fan_tach_path[$i]}")
#Compare state of dual rotors with CriticalAlarmLow to check if fan fail
if [ ${#current_fan_state[@]} -eq 2 ];then
if [ "${current_fan_state[0]}" == "true" ] && \
[ "${current_fan_state[1]}" == "true" ] ;then
if [ $check_fail_flag -eq 0 ];then
systemctl stop phosphor-pid-control
for j in "${!fan_tach_path[@]}";
do
#If fan fail is detect, set other fan rpm to pwm 255.
set_fan_value "$hwmon_path" "${fan_tach_path[$j]}"
check_fail_flag=1
done
fi
current_fan_state=()
break
fi
current_fan_state=()
fi
#fans are going to normal.
if [ "$i" -eq $((${#fan_tach_path[@]}-1)) ] && [ $check_fail_flag -eq 1 ]; then
check_fail_flag=0
systemctl restart phosphor-pid-control
fi
done
sleep 2
done
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