diff --git a/extensions/openpower-pels/service_indicators.cpp b/extensions/openpower-pels/service_indicators.cpp
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+++ b/extensions/openpower-pels/service_indicators.cpp
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+/**
+ * Copyright © 2020 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 "service_indicators.hpp"
+
+#include <phosphor-logging/log.hpp>
+
+namespace openpower::pels::service_indicators
+{
+
+using namespace phosphor::logging;
+
+std::unique_ptr<Policy> getPolicy(const DataInterfaceBase& dataIface)
+{
+    // At the moment there is just one type of policy.
+    return std::make_unique<LightPath>(dataIface);
+}
+
+bool LightPath::ignore(const PEL& pel) const
+{
+    // TODO
+    return false;
+}
+
+void LightPath::activate(const PEL& pel)
+{
+    if (ignore(pel))
+    {
+        return;
+    }
+
+    // Now that we've gotten this far, we'll need to turn on
+    // the system attention indicator if we don't find other
+    // indicators to turn on.
+    bool sai = true;
+    auto src = pel.primarySRC();
+    const auto& calloutsObj = (*src)->callouts();
+
+    if (calloutsObj && !calloutsObj->callouts().empty())
+    {
+        const auto& callouts = calloutsObj->callouts();
+
+        // From the callouts, find the location codes whose
+        // LEDs need to be turned on.
+        auto locCodes = getLocationCodes(callouts);
+        if (!locCodes.empty())
+        {
+            // Find the LED groups for those location codes.
+            auto ledPaths = getLEDGroupPaths(locCodes);
+            if (!ledPaths.empty())
+            {
+                // Tell the LED groups to assert their LEDs.
+                assertLEDs(ledPaths);
+                sai = false;
+            }
+        }
+    }
+
+    if (sai)
+    {
+        log<level::INFO>("The System Attention Indicator needs to be turned "
+                         "on, when available");
+    }
+}
+
+std::vector<std::string> LightPath::getLocationCodes(
+    const std::vector<std::unique_ptr<src::Callout>>& callouts) const
+{
+    // TODO
+    return {};
+}
+
+std::vector<std::string> LightPath::getLEDGroupPaths(
+    const std::vector<std::string>& locationCodes) const
+{
+    // TODO
+    return {};
+}
+
+void LightPath::assertLEDs(const std::vector<std::string>& ledGroups) const
+{
+    // TODO
+}
+
+} // namespace openpower::pels::service_indicators