hw-mgmt: scripts: Fix creation and removal of psuN_i2c_bus files

These files are created when PSU cables are plugged in
and removed when PSU cable are plugged out. Instead,
they should be created and removed when PSUs are plugged in
and plugged out respectively. Otherwise there is no way to
distingush between dummy PSU and real PSU that was
disconnected from power.

Bug: 4176785

Signed-off-by: Felix Radensky <[email protected]>

usr/usr/bin/hw-management-chassis-events.sh

@@ -652,6 +652,31 @@ function handle_hotplug_event()
 			fi
 		fi
 		;;
+	psu*)
+		psu_name="$attribute"
+		# SN5600, SN5400 systems have PSU2 with I2C address 0x5a. In udev rules 0x5a corresponds to psu4.
+		if [[ ( $sku == "HI144" || $sku == "HI147" ) && "$2" == "psu4" ]]; then
+			psu_name="psu2"
+		fi
+		find_i2c_bus
+		i2c_comex_mon_bus_default=$(< $i2c_comex_mon_bus_default_file)
+		comex_bus=$((i2c_comex_mon_bus_default+i2c_bus_offset))
+		busdir=$(echo "$5""$3" |xargs dirname |xargs dirname)
+		busfolder=$(basename "$busdir")
+		bus="${busfolder:0:${#busfolder}-5}"
+		# Verify if this is COMEX device
+		if [ "$bus" == "$comex_bus" ]; then
+			return
+		fi
+
+		if [ "$event" -eq 1 ]; then
+			echo "$bus" > $config_path/"$psu_name"_i2c_bus
+		else
+			if [ -e "$config_path"/"$psu_name"_i2c_bus ]; then
+				rm -f $config_path/"$psu_name"_i2c_bus
+			fi
+		fi
+		;;
 	*)
 		;;
 	esac

usr/usr/bin/hw-management-thermal-events.sh

@@ -869,8 +869,6 @@ if [ "$1" == "add" ]; then
 		# Allow PS controller to stabilize
 		retry_helper "ls" 0.2 20 "$2 takes too long to init" "$5""$3"/in1_input
 		sleep 1
-		# Set I2C bus for psu
-		echo "$bus" > $config_path/"$psu_name"_i2c_bus
 		# Set default fan speed
 		psu_set_fan_speed "$psu_name" $(< $fan_psu_default)
 		# Add thermal attributes
@@ -1421,9 +1419,6 @@ else
 			rm -f "$config_path"/"$psu_name"_power_slope
 			rm -f "$config_path"/"$psu_name"_power_capacity
 		fi
-		if [ -e "$config_path"/"$psu_name"_i2c_bus ]; then
-			rm -f "$config_path"/"$psu_name"_i2c_bus
-		fi
 	fi
 	if [ "$2" == "sxcore" ]; then
 		/usr/bin/hw-management.sh chipdown 0 "$4/$5"