Default implementation for CAN bus HAL
This implementation supports SocketCAN interfaces.
Bug: 135918744
Test: VTS (separate new change)
Change-Id: I12b93e37fa64e341bee2c64eaf130b39977fcef5
diff --git a/automotive/can/1.0/default/CanSocket.h b/automotive/can/1.0/default/CanSocket.h
new file mode 100644
index 0000000..cd7162d
--- /dev/null
+++ b/automotive/can/1.0/default/CanSocket.h
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2019 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.
+ */
+
+#pragma once
+
+#include <android-base/macros.h>
+#include <android-base/unique_fd.h>
+#include <linux/can.h>
+
+#include <atomic>
+#include <chrono>
+#include <thread>
+
+namespace android {
+namespace hardware {
+namespace automotive {
+namespace can {
+namespace V1_0 {
+namespace implementation {
+
+/**
+ * Wrapper around SocketCAN socket.
+ */
+struct CanSocket {
+ using ReadCallback = std::function<void(const struct canfd_frame&, std::chrono::nanoseconds)>;
+ using ErrorCallback = std::function<void()>;
+
+ /**
+ * Open and bind SocketCAN socket.
+ *
+ * \param ifname SocketCAN network interface name (such as can0)
+ * \param rdcb Callback on received messages
+ * \param errcb Callback on socket failure
+ * \return Socket instance, or nullptr if it wasn't possible to open one
+ */
+ static std::unique_ptr<CanSocket> open(const std::string& ifname, ReadCallback rdcb,
+ ErrorCallback errcb);
+ virtual ~CanSocket();
+
+ /**
+ * Send CAN frame.
+ *
+ * \param frame Frame to send
+ * \return true in case of success, false otherwise
+ */
+ bool send(const struct canfd_frame& frame);
+
+ private:
+ CanSocket(base::unique_fd socket, ReadCallback rdcb, ErrorCallback errcb);
+ void readerThread();
+
+ ReadCallback mReadCallback;
+ ErrorCallback mErrorCallback;
+
+ const base::unique_fd mSocket;
+ std::thread mReaderThread;
+ std::atomic<bool> mStopReaderThread = false;
+
+ DISALLOW_COPY_AND_ASSIGN(CanSocket);
+};
+
+} // namespace implementation
+} // namespace V1_0
+} // namespace can
+} // namespace automotive
+} // namespace hardware
+} // namespace android