1 files changed, 69 insertions, 0 deletions
diff --git a/presence/tach_sensor.cpp b/presence/tach_sensor.cpp
new file mode 100644
index 0000000..c21478b
--- /dev/null
+++ b/presence/tach_sensor.cpp
@@ -0,0 +1,69 @@
+/**
+ * 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 <sdbusplus/exception.hpp>
+#include "tach_sensor.hpp"
+#include "fan_enclosure.hpp"
+
+
+namespace phosphor
+{
+namespace fan
+{
+namespace presence
+{
+
+bool TachSensor::isPresent()
+{
+    return (tach != 0);
+}
+
+// Tach signal callback handler
+int TachSensor::handleTachChangeSignal(sd_bus_message* msg,
+                                       void* usrData,
+                                       sd_bus_error* err)
+{
+    auto sdbpMsg = sdbusplus::message::message(msg);
+    static_cast<TachSensor*>(usrData)->handleTachChange(sdbpMsg, err);
+    return 0;
+}
+
+void TachSensor::handleTachChange(sdbusplus::message::message& sdbpMsg,
+                                  sd_bus_error* err)
+{
+    std::string msgSensor;
+    std::map<std::string, sdbusplus::message::variant<int64_t>> msgData;
+    sdbpMsg.read(msgSensor, msgData);
+
+    // TODO openbmc/phosphor-fan-presence#5
+    //      Update to use 'arg0namespace' match option to reduce dbus traffic
+    // Find interface with value property
+    if (msgSensor.compare("xyz.openbmc_project.Sensor.Value") == 0)
+    {
+        // Find the 'Value' property containing tach
+        auto valPropMap = msgData.find("Value");
+        if (valPropMap != msgData.end())
+        {
+            tach = sdbusplus::message::variant_ns::get<int64_t>(
+                valPropMap->second);
+        }
+    }
+    // Update inventory according to latest tach reported
+    fanEnc.updInventory();
+}
+
+} // namespace presence
+} // namespace fan
+} // namespace phosphor