1//
2// Copyright 2017 The Android Open Source Project
3//
4// Licensed under the Apache License, Version 2.0 (the "License");
5// you may not use this file except in compliance with the License.
6// You may obtain a copy of the License at
7//
8// http://www.apache.org/licenses/LICENSE-2.0
9//
10// Unless required by applicable law or agreed to in writing, software
11// distributed under the License is distributed on an "AS IS" BASIS,
12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13// See the License for the specific language governing permissions and
14// limitations under the License.
15//
16
17#include "h4_protocol.h"
18
19#define LOG_TAG "android.hardware.bluetooth-hci-h4"
20#include <android-base/logging.h>
21#include <assert.h>
22#include <fcntl.h>
23
24namespace android {
25namespace hardware {
26namespace bluetooth {
27namespace hci {
28
29size_t H4Protocol::Send(uint8_t type, const uint8_t* data, size_t length) {
30  int rv = WriteSafely(uart_fd_, &type, sizeof(type));
31  if (rv == sizeof(type)) {
32    rv = WriteSafely(uart_fd_, data, length);
33  }
34  return rv;
35}
36
37void H4Protocol::OnPacketReady() {
38  switch (hci_packet_type_) {
39    case HCI_PACKET_TYPE_EVENT:
40      event_cb_(hci_packetizer_.GetPacket());
41      break;
42    case HCI_PACKET_TYPE_ACL_DATA:
43      acl_cb_(hci_packetizer_.GetPacket());
44      break;
45    case HCI_PACKET_TYPE_SCO_DATA:
46      sco_cb_(hci_packetizer_.GetPacket());
47      break;
48    default: {
49      bool bad_packet_type = true;
50      CHECK(!bad_packet_type);
51    }
52  }
53  // Get ready for the next type byte.
54  hci_packet_type_ = HCI_PACKET_TYPE_UNKNOWN;
55}
56
57void H4Protocol::OnDataReady(int fd) {
58  if (hci_packet_type_ == HCI_PACKET_TYPE_UNKNOWN) {
59    uint8_t buffer[1] = {0};
60    size_t bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer, 1));
61    CHECK(bytes_read == 1);
62    hci_packet_type_ = static_cast<HciPacketType>(buffer[0]);
63  } else {
64    hci_packetizer_.OnDataReady(fd, hci_packet_type_);
65  }
66}
67
68}  // namespace hci
69}  // namespace bluetooth
70}  // namespace hardware
71}  // namespace android
72