1 files changed, 60 insertions, 0 deletions
diff --git a/meta-rcs/meta-talos/recipes-phosphor/fans/detect-fan-fail/detect-fan-fail.sh b/meta-rcs/meta-talos/recipes-phosphor/fans/detect-fan-fail/detect-fan-fail.sh
new file mode 100644
index 000000000..9f42e2350
--- /dev/null
+++ b/meta-rcs/meta-talos/recipes-phosphor/fans/detect-fan-fail/detect-fan-fail.sh
@@ -0,0 +1,60 @@
+#!/bin/bash
+#
+# Copyright 2020 Raptor Engineering, LLC
+
+# 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'
+                '/xyz/openbmc_project/sensors/fan_tach/fan1'
+                '/xyz/openbmc_project/sensors/fan_tach/fan2'
+                '/xyz/openbmc_project/sensors/fan_tach/fan3'
+                '/xyz/openbmc_project/sensors/fan_tach/fan4'
+                '/xyz/openbmc_project/sensors/fan_tach/fan5'
+                )
+
+check_fail_flag=0
+current_fan_state=()
+while true; do
+    for i in ${!fan_tach_path[@]};
+    do
+        hwmon_path="$(mapper get-service ${fan_tach_path[0]})"
+        current_fan_state[$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