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 
24 namespace android {
25 namespace hardware {
26 namespace bluetooth {
27 namespace hci {
28 
29 size_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 
37 void 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 
57 void 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