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
21 #include <errno.h>
22 #include <fcntl.h>
23 #include <log/log.h>
24 #include <sys/uio.h>
25 #include <unistd.h>
26
27 namespace android {
28 namespace hardware {
29 namespace bluetooth {
30 namespace hci {
31
Send(uint8_t type,const uint8_t * data,size_t length)32 size_t H4Protocol::Send(uint8_t type, const uint8_t* data, size_t length) {
33 struct iovec iov[] = {{&type, sizeof(type)},
34 {const_cast<uint8_t*>(data), length}};
35 ssize_t ret = 0;
36 do {
37 ret = TEMP_FAILURE_RETRY(writev(uart_fd_, iov, sizeof(iov) / sizeof(iov[0])));
38 } while (-1 == ret && EAGAIN == errno);
39
40 if (ret == -1) {
41 ALOGE("%s error writing to UART (%s)", __func__, strerror(errno));
42 } else if (ret < static_cast<ssize_t>(length + 1)) {
43 ALOGE("%s: %d / %d bytes written - something went wrong...", __func__,
44 static_cast<int>(ret), static_cast<int>(length + 1));
45 }
46 return ret;
47 }
48
OnPacketReady()49 void H4Protocol::OnPacketReady() {
50 switch (hci_packet_type_) {
51 case HCI_PACKET_TYPE_EVENT:
52 event_cb_(hci_packetizer_.GetPacket());
53 break;
54 case HCI_PACKET_TYPE_ACL_DATA:
55 acl_cb_(hci_packetizer_.GetPacket());
56 break;
57 case HCI_PACKET_TYPE_SCO_DATA:
58 sco_cb_(hci_packetizer_.GetPacket());
59 break;
60 default:
61 LOG_ALWAYS_FATAL("%s: Unimplemented packet type %d", __func__,
62 static_cast<int>(hci_packet_type_));
63 }
64 // Get ready for the next type byte.
65 hci_packet_type_ = HCI_PACKET_TYPE_UNKNOWN;
66 }
67
OnDataReady(int fd)68 void H4Protocol::OnDataReady(int fd) {
69 if (hci_packet_type_ == HCI_PACKET_TYPE_UNKNOWN) {
70 uint8_t buffer[1] = {0};
71 ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer, 1));
72 if (bytes_read != 1) {
73 if (bytes_read == 0) {
74 // This is only expected if the UART got closed when shutting down.
75 ALOGE("%s: Unexpected EOF reading the packet type!", __func__);
76 sleep(5); // Expect to be shut down within 5 seconds.
77 return;
78 } else if (bytes_read < 0) {
79 LOG_ALWAYS_FATAL("%s: Read packet type error: %s", __func__,
80 strerror(errno));
81 } else {
82 LOG_ALWAYS_FATAL("%s: More bytes read than expected (%u)!", __func__,
83 static_cast<unsigned int>(bytes_read));
84 }
85 }
86 hci_packet_type_ = static_cast<HciPacketType>(buffer[0]);
87 if (hci_packet_type_ != HCI_PACKET_TYPE_ACL_DATA &&
88 hci_packet_type_ != HCI_PACKET_TYPE_SCO_DATA &&
89 hci_packet_type_ != HCI_PACKET_TYPE_EVENT) {
90 LOG_ALWAYS_FATAL("%s: Unimplemented packet type %d", __func__,
91 static_cast<int>(hci_packet_type_));
92 }
93 } else {
94 hci_packetizer_.OnDataReady(fd, hci_packet_type_);
95 }
96 }
97
98 } // namespace hci
99 } // namespace bluetooth
100 } // namespace hardware
101 } // namespace android
102