Implement power control for x86 based platforms

This power control module provides the capability to
power on/off the host via gpio.
And provides some interfaces for system to contorl the system
power like:
    setPowerState
    getPowerState

Change-Id: Icd6530c42f2bc7c4d84062be786d25710b53f434
Signed-off-by: Kuiying Wang <kuiying.wang@intel.com>
diff --git a/power-control/src/main.cpp b/power-control/src/main.cpp
new file mode 100644
index 0000000..695666e
--- /dev/null
+++ b/power-control/src/main.cpp
@@ -0,0 +1,64 @@
+/*
+// Copyright (c) 2018 Intel 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 "power_control.hpp"
+
+int main(int argc, char* argv[])
+{
+    int ret = 0;
+
+    phosphor::logging::log<phosphor::logging::level::INFO>(
+        "Start Chassis power control service...");
+
+    sd_event* event = nullptr;
+    ret = sd_event_default(&event);
+    if (ret < 0)
+    {
+        phosphor::logging::log<phosphor::logging::level::ERR>(
+            "Error creating a default sd_event handler");
+        return ret;
+    }
+    phosphor::watchdog::EventPtr eventP{event,
+                                        phosphor::watchdog::EventDeleter()};
+    event = nullptr;
+
+    sdbusplus::bus::bus bus = sdbusplus::bus::new_default();
+    sdbusplus::server::manager_t m{bus, DBUS_OBJECT_NAME};
+
+    bus.request_name(DBUS_INTF_NAME);
+
+    PowerControl powerControl{bus, DBUS_OBJECT_NAME, eventP};
+
+    auto now_ms = std::chrono::time_point_cast<std::chrono::milliseconds>(
+        std::chrono::system_clock::now());
+
+    try
+    {
+        bus.attach_event(eventP.get(), SD_EVENT_PRIORITY_NORMAL);
+        ret = sd_event_loop(eventP.get());
+        if (ret < 0)
+        {
+            phosphor::logging::log<phosphor::logging::level::ERR>(
+                "Error occurred during the sd_event_loop",
+                phosphor::logging::entry("RET=%d", ret));
+        }
+    }
+    catch (std::exception& e)
+    {
+        phosphor::logging::log<phosphor::logging::level::ERR>(e.what());
+        return -1;
+    }
+    return 0;
+}