Start with async and HCI
Bug: 205758693
Test: unit tests
Change-Id: I16a8be44bce5f2d233582ab6db17c30d068fa9c0
diff --git a/bluetooth/hci/h4_protocol.h b/bluetooth/hci/h4_protocol.h
new file mode 100644
index 0000000..5daee83
--- /dev/null
+++ b/bluetooth/hci/h4_protocol.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2022 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 <memory>
+#include <vector>
+
+#include "hci_internals.h"
+#include "hci_packetizer.h"
+
+namespace android::hardware::bluetooth::hci {
+
+using PacketReadCallback = std::function<void(const std::vector<uint8_t>&)>;
+using DisconnectCallback = std::function<void(void)>;
+
+class H4Protocol {
+ public:
+ H4Protocol(int fd, PacketReadCallback cmd_cb, PacketReadCallback acl_cb,
+ PacketReadCallback sco_cb, PacketReadCallback event_cb,
+ PacketReadCallback iso_cb, DisconnectCallback disconnect_cb);
+
+ size_t Send(PacketType type, const uint8_t* data, size_t length);
+ size_t Send(PacketType type, const std::vector<uint8_t>& data);
+
+ void OnDataReady();
+
+ protected:
+ size_t OnPacketReady(const std::vector<uint8_t>& packet);
+ void SendDataToPacketizer(uint8_t* buffer, size_t length);
+
+ private:
+ int uart_fd_;
+ bool disconnected_{false};
+
+ PacketReadCallback cmd_cb_;
+ PacketReadCallback acl_cb_;
+ PacketReadCallback sco_cb_;
+ PacketReadCallback event_cb_;
+ PacketReadCallback iso_cb_;
+ DisconnectCallback disconnect_cb_;
+
+ PacketType hci_packet_type_{PacketType::UNKNOWN};
+ HciPacketizer hci_packetizer_;
+
+ /**
+ * Question : Why read in single chunk rather than multiple reads?
+ * Answer: Using multiple reads does not work with some BT USB dongles.
+ * Reading in single shot gives expected response.
+ * ACL max length is 2 bytes, so using 64K as the buffer length.
+ */
+ static constexpr size_t kMaxPacketLength = 64 * 1024;
+};
+
+} // namespace android::hardware::bluetooth::hci