drm_hwcomposer: Add DrmEventListener worker

This patch adds a worker which listens to drm events. If the
drm event has a handler associated with it, the listener will
call the handler.

BUG=chrome-os-partner:41682
TEST=Tested on ryu with DP

Change-Id: I5d691d191425604766a00be3e72111095d025d06
Signed-off-by: Sean Paul <seanpaul@chromium.org>

1 files changed, 65 insertions, 0 deletions

diff --git a/drmeventlistener.h b/drmeventlistener.h
new file mode 100644
index 0000000..61eefe8
--- /dev/null
+++ b/drmeventlistener.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef ANDROID_DRM_EVENT_LISTENER_H_
+#define ANDROID_DRM_EVENT_LISTENER_H_
+
+#include "autofd.h"
+#include "worker.h"
+
+namespace android {
+
+class DrmResources;
+
+class DrmEventHandler {
+ public:
+  DrmEventHandler() {
+  }
+  virtual ~DrmEventHandler() {
+  }
+
+  virtual void HandleEvent(uint64_t timestamp_us) = 0;
+};
+
+class DrmEventListener : public Worker {
+ public:
+  DrmEventListener(DrmResources *drm);
+  virtual ~DrmEventListener() {
+  }
+
+  int Init();
+
+  void RegisterHotplugHandler(DrmEventHandler *handler);
+
+  static void FlipHandler(int fd, unsigned int sequence, unsigned int tv_sec,
+                          unsigned int tv_usec, void *user_data);
+
+ protected:
+  virtual void Routine();
+
+ private:
+  void UEventHandler();
+
+  fd_set fds_;
+  UniqueFd uevent_fd_;
+  int max_fd_ = -1;
+
+  DrmResources *drm_;
+  DrmEventHandler *hotplug_handler_ = NULL;
+};
+}
+
+#endif