diff --git a/utility.cpp b/utility.cpp
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--- /dev/null
+++ b/utility.cpp
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+/**
+ * Copyright © 2017 IBM Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <string>
+#include "utility.hpp"
+
+namespace phosphor
+{
+namespace fan
+{
+namespace presence
+{
+
+//TODO Should get these from phosphor-objmgr config.h
+constexpr auto MAPPER_BUSNAME = "xyz.openbmc_project.ObjectMapper";
+constexpr auto MAPPER_PATH = "/xyz/openbmc_project/object_mapper";
+constexpr auto MAPPER_INTERFACE = "xyz.openbmc_project.ObjectMapper";
+
+//TODO Should get these from phosphor-inventory-manager config.h
+constexpr auto INVENTORY_PATH = "/xyz/openbmc_project/inventory";
+constexpr auto INVENTORY_INTF = "xyz.openbmc_project.Inventory.Manager";
+
+std::string getInvService(sdbusplus::bus::bus& bus)
+{
+    auto mapperCall = bus.new_method_call(MAPPER_BUSNAME,
+                                          MAPPER_PATH,
+                                          MAPPER_INTERFACE,
+                                          "GetObject");
+
+    mapperCall.append(INVENTORY_PATH);
+    mapperCall.append(std::vector<std::string>({INVENTORY_INTF}));
+
+    auto mapperResponseMsg = bus.call(mapperCall);
+    if (mapperResponseMsg.is_method_error())
+    {
+        throw std::runtime_error(
+            "Error in mapper call to get inventory service name");
+    }
+
+    std::map<std::string, std::vector<std::string>> mapperResponse;
+    mapperResponseMsg.read(mapperResponse);
+
+    if (mapperResponse.empty())
+    {
+        throw std::runtime_error(
+            "Error in mapper response for inventory service name");
+    }
+
+    return mapperResponse.begin()->first;
+}
+
+}
+}
+}