diff --git a/phosphor-power-supply/util_base.hpp b/phosphor-power-supply/util_base.hpp
index ab1a962..194ddff 100644
--- a/phosphor-power-supply/util_base.hpp
+++ b/phosphor-power-supply/util_base.hpp
@@ -18,6 +18,10 @@
 
     virtual bool getPresence(sdbusplus::bus::bus& bus,
                              const std::string& invpath) const = 0;
+
+    virtual void setPresence(sdbusplus::bus::bus& bus,
+                             const std::string& invpath, bool present,
+                             const std::string& name) const = 0;
 };
 
 const UtilBase& getUtils();
@@ -27,4 +31,18 @@
     return getUtils().getPresence(bus, invpath);
 }
 
+inline void setPresence(sdbusplus::bus::bus& bus, const std::string& invpath,
+                        bool present, const std::string& name)
+{
+    return getUtils().setPresence(bus, invpath, present, name);
+}
+
+class GPIOInterface
+{
+  public:
+    virtual ~GPIOInterface() = default;
+
+    virtual int read() = 0;
+};
+
 } // namespace phosphor::power::psu