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 =
38 TEMP_FAILURE_RETRY(writev(uart_fd_, iov, sizeof(iov) / sizeof(iov[0])));
39 } while (-1 == ret && EAGAIN == errno);
40
41 if (ret == -1) {
42 ALOGE("%s error writing to UART (%s)", __func__, strerror(errno));
43 } else if (ret < static_cast<ssize_t>(length + 1)) {
44 ALOGE("%s: %d / %d bytes written - something went wrong...", __func__,
45 static_cast<int>(ret), static_cast<int>(length + 1));
46 }
47 return ret;
48 }
49
OnPacketReady()50 void H4Protocol::OnPacketReady() {
51 switch (hci_packet_type_) {
52 case HCI_PACKET_TYPE_EVENT:
53 event_cb_(hci_packetizer_.GetPacket());
54 break;
55 case HCI_PACKET_TYPE_ACL_DATA:
56 acl_cb_(hci_packetizer_.GetPacket());
57 break;
58 case HCI_PACKET_TYPE_SCO_DATA:
59 sco_cb_(hci_packetizer_.GetPacket());
60 break;
61 default:
62 LOG_ALWAYS_FATAL("%s: Unimplemented packet type %d", __func__,
63 static_cast<int>(hci_packet_type_));
64 }
65 // Get ready for the next type byte.
66 hci_packet_type_ = HCI_PACKET_TYPE_UNKNOWN;
67 }
68
OnDataReady(int fd)69 void H4Protocol::OnDataReady(int fd) {
70 if (hci_packet_type_ == HCI_PACKET_TYPE_UNKNOWN) {
71 uint8_t buffer[1] = {0};
72 ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer, 1));
73 if (bytes_read != 1) {
74 if (bytes_read == 0) {
75 // This is only expected if the UART got closed when shutting down.
76 ALOGE("%s: Unexpected EOF reading the packet type!", __func__);
77 sleep(5); // Expect to be shut down within 5 seconds.
78 return;
79 } else if (bytes_read < 0) {
80 LOG_ALWAYS_FATAL("%s: Read packet type error: %s", __func__,
81 strerror(errno));
82 } else {
83 LOG_ALWAYS_FATAL("%s: More bytes read than expected (%u)!", __func__,
84 static_cast<unsigned int>(bytes_read));
85 }
86 }
87 hci_packet_type_ = static_cast<HciPacketType>(buffer[0]);
88 if (hci_packet_type_ != HCI_PACKET_TYPE_ACL_DATA &&
89 hci_packet_type_ != HCI_PACKET_TYPE_SCO_DATA &&
90 hci_packet_type_ != HCI_PACKET_TYPE_EVENT) {
91 LOG_ALWAYS_FATAL("%s: Unimplemented packet type %d", __func__,
92 static_cast<int>(hci_packet_type_));
93 }
94 } else {
95 hci_packetizer_.OnDataReady(fd, hci_packet_type_);
96 }
97 }
98
99 } // namespace hci
100 } // namespace bluetooth
101 } // namespace hardware
102 } // namespace android
103