diff --git a/power-supply/power_supply.hpp b/power-supply/power_supply.hpp
index 4249024..43489d2 100644
--- a/power-supply/power_supply.hpp
+++ b/power-supply/power_supply.hpp
@@ -1,5 +1,6 @@
 #pragma once
 #include "device.hpp"
+#include "pmbus.hpp"
 
 namespace witherspoon
 {
@@ -29,10 +30,14 @@
          * @param[in] inst - the device instance
          * @param[in] objpath - the path to monitor
          * @param[in] invpath - the inventory path to use
+         * @param[in] bus - D-Bus bus object
          */
         PowerSupply(const std::string& name, size_t inst,
-                    const std::string& objpath, const std::string& invpath)
-            : Device(name, inst), monitorPath(objpath), inventoryPath(invpath)
+                    const std::string& objpath,
+                    const std::string& invpath,
+                    sdbusplus::bus::bus& bus)
+            : Device(name, inst), monitorPath(objpath), inventoryPath(invpath),
+            bus(bus), pmbusIntf(objpath)
         {
         }
 
@@ -65,6 +70,39 @@
          * The D-Bus path to use for this power supply's inventory status.
          */
         std::string inventoryPath;
+
+        /** @brief Connection for sdbusplus bus */
+        sdbusplus::bus::bus& bus;
+
+        /**
+         * @brief Pointer to the PMBus interface
+         *
+         * Used to read out of or write to the /sysfs tree(s) containing files
+         * that a device driver monitors the PMBus interface to the power
+         * supplies.
+         */
+        witherspoon::pmbus::PMBus pmbusIntf;
+
+        /**
+         * @brief Has a PMBus read failure already been logged?
+         */
+        bool readFailLogged = false;
+
+        /**
+         * @brief Set to true when a VIN UV fault has been detected
+         *
+         * This is the VIN_UV_FAULT bit in the low byte from the STATUS_WORD
+         * command response.
+         */
+        bool vinUVFault = false;
+
+        /**
+         * @brief Set to true when an input fault or warning is detected
+         *
+         * This is the "INPUT FAULT OR WARNING" bit in the high byte from the
+         * STATUS_WORD command response.
+         */
+        bool inputFault = false;
 };
 
 }