1 files changed, 132 insertions, 0 deletions
diff --git a/evdev.hpp b/evdev.hpp
new file mode 100644
index 0000000..b3189f1
--- /dev/null
+++ b/evdev.hpp
@@ -0,0 +1,132 @@
+#pragma once
+#include <string>
+#include <systemd/sd-event.h>
+#include <libevdev/libevdev.h>
+#include "file.hpp"
+
+namespace phosphor
+{
+namespace gpio
+{
+
+/* Need a custom deleter for freeing up sd_event */
+struct EventDeleter
+{
+    void operator()(sd_event* event) const
+    {
+        event = sd_event_unref(event);
+    }
+};
+using EventPtr = std::unique_ptr<sd_event, EventDeleter>;
+
+/* Need a custom deleter for freeing up sd_event_source */
+struct EventSourceDeleter
+{
+    void operator()(sd_event_source* eventSource) const
+    {
+        eventSource = sd_event_source_unref(eventSource);
+    }
+};
+using EventSourcePtr = std::unique_ptr<sd_event_source, EventSourceDeleter>;
+
+/* Need a custom deleter for freeing up evdev struct */
+struct FreeEvDev
+{
+    void operator()(struct libevdev* device) const
+    {
+        libevdev_free(device);
+    }
+};
+using EvdevPtr = std::unique_ptr<struct libevdev, FreeEvDev>;
+
+/** @class Evdev
+ *  @brief Responsible for catching GPIO state changes conditions and taking
+ *  actions
+ */
+class Evdev
+{
+
+        using Property = std::string;
+        using Value = sdbusplus::message::variant<bool, std::string>;
+        // Association between property and its value
+        using PropertyMap = std::map<Property, Value>;
+        using Interface = std::string;
+        // Association between interface and the D-Bus property
+        using InterfaceMap = std::map<Interface, PropertyMap>;
+        using Object = sdbusplus::message::object_path;
+        // Association between object and the interface
+        using ObjectMap = std::map<Object, InterfaceMap>;
+
+    public:
+        Evdev() = delete;
+        ~Evdev() = default;
+        Evdev(const Evdev&) = delete;
+        Evdev& operator=(const Evdev&) = delete;
+        Evdev(Evdev&&) = delete;
+        Evdev& operator=(Evdev&&) = delete;
+
+        /** @brief Constructs Evdev object.
+         *
+         *  @param[in] path      - Device path to read for GPIO pin state
+         *  @param[in] key       - GPIO key to monitor
+         *  @param[in] event     - sd_event handler
+         *  @param[in] handler   - IO callback handler. Defaults to one in this
+         *                        class
+         *  @param[in] useEvDev  - Whether to use EvDev to retrieve events
+         */
+        Evdev(const std::string& path,
+              const unsigned int key,
+              EventPtr& event,
+              sd_event_io_handler_t handler,
+              bool useEvDev = true) :
+            path(path),
+            key(key),
+            event(event),
+            callbackHandler(handler),
+            fd(openDevice())
+
+        {
+            if (useEvDev)
+            {
+                // If we are asked to use EvDev, do that initialization.
+                initEvDev();
+            }
+
+            // Register callback handler when FD has some data
+            registerCallback();
+        }
+
+    protected:
+        /** @brief Device path to read for GPIO pin state */
+        const std::string path;
+
+        /** @brief GPIO key to monitor */
+        const unsigned int key;
+
+        /** @brief Event structure */
+        EvdevPtr devicePtr;
+
+        /** @brief Monitor to sd_event */
+        EventPtr& event;
+
+        /** @brief Callback handler when the FD has some data */
+        sd_event_io_handler_t callbackHandler;
+
+        /** @brief event source */
+        EventSourcePtr eventSource;
+
+        /** @brief Opens the device and populates the descriptor */
+        int openDevice();
+
+        /** @brief attaches FD to events and sets up callback handler */
+        void registerCallback();
+
+        /** @brief File descriptor manager */
+        FileDescriptor fd;
+
+        /** @brief Initializes evdev handle with the fd */
+        void initEvDev();
+};
+
+} // namespace gpio
+} // namespace phosphor