regulators: Add hardware presence service
The regulators application needs to determine whether hardware is
present or absent. Some voltage regulators are optional, and
configuration should only be performed if the regulator is present.
Add a new class to obtain hardware presence data from the D-Bus
xyz.openbmc_project.Inventory.Item interface.
Also define an abstract base class and a mock implementation to enable
use of gmock in test cases related to hardware presence.
Tested:
* Tested where inventory path is present
* Tested where inventory path is not present
* Tested where inventory path is invalid and results in an exception
* Verified that mock implementation could be used in a gmock test case
* Full test plan available at
https://gist.github.com/smccarney/2b6ea6ecbbeaf5a8b1793e2321799972
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: Ia25a92815efc506c3ef4ac72844c17120c4ce9b7
diff --git a/phosphor-regulators/src/presence_service.cpp b/phosphor-regulators/src/presence_service.cpp
new file mode 100644
index 0000000..7233d28
--- /dev/null
+++ b/phosphor-regulators/src/presence_service.cpp
@@ -0,0 +1,48 @@
+/**
+ * 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 "presence_service.hpp"
+
+#include "types.hpp"
+#include "utility.hpp"
+
+namespace phosphor::power::regulators
+{
+
+bool DBusPresenceService::isPresent(const std::string& inventoryPath)
+{
+ bool present{false};
+
+ // Try to find cached presence value
+ auto it = cache.find(inventoryPath);
+ if (it != cache.end())
+ {
+ present = it->second;
+ }
+ else
+ {
+ // Get presence from D-Bus interface/property
+ util::getProperty(INVENTORY_IFACE, PRESENT_PROP, inventoryPath,
+ INVENTORY_MGR_IFACE, bus, present);
+
+ // Cache presence value
+ cache[inventoryPath] = present;
+ }
+
+ return present;
+}
+
+} // namespace phosphor::power::regulators