143 lines
4.3 KiB
C++
143 lines
4.3 KiB
C++
/*
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* Copyright 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "h4_protocol.h"
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#define LOG_TAG "android.hardware.bluetooth.hci-h4"
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/uio.h>
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#include "log/log.h"
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namespace android::hardware::bluetooth::hci {
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H4Protocol::H4Protocol(int fd, PacketReadCallback cmd_cb,
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PacketReadCallback acl_cb, PacketReadCallback sco_cb,
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PacketReadCallback event_cb, PacketReadCallback iso_cb,
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DisconnectCallback disconnect_cb)
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: uart_fd_(fd),
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cmd_cb_(std::move(cmd_cb)),
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acl_cb_(std::move(acl_cb)),
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sco_cb_(std::move(sco_cb)),
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event_cb_(std::move(event_cb)),
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iso_cb_(std::move(iso_cb)),
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disconnect_cb_(std::move(disconnect_cb)) {}
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size_t H4Protocol::Send(PacketType type, const std::vector<uint8_t>& vector) {
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return Send(type, vector.data(), vector.size());
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}
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size_t H4Protocol::Send(PacketType type, const uint8_t* data, size_t length) {
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/* For HCI communication over USB dongle, multiple write results in
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* response timeout as driver expect type + data at once to process
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* the command, so using "writev"(for atomicity) here.
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*/
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struct iovec iov[2];
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ssize_t ret = 0;
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iov[0].iov_base = &type;
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iov[0].iov_len = sizeof(type);
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iov[1].iov_base = (void*)data;
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iov[1].iov_len = length;
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while (1) {
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ret = TEMP_FAILURE_RETRY(writev(uart_fd_, iov, 2));
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if (ret == -1) {
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LOG_ALWAYS_FATAL("%s error writing to UART (%s)", __func__,
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strerror(errno));
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} else if (ret == 0) {
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// Nothing written :(
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ALOGE("%s zero bytes written - something went wrong...", __func__);
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break;
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}
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break;
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}
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return ret;
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}
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size_t H4Protocol::OnPacketReady(const std::vector<uint8_t>& packet) {
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switch (hci_packet_type_) {
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case PacketType::COMMAND:
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cmd_cb_(packet);
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break;
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case PacketType::ACL_DATA:
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acl_cb_(packet);
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break;
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case PacketType::SCO_DATA:
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sco_cb_(packet);
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break;
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case PacketType::EVENT:
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event_cb_(packet);
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break;
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case PacketType::ISO_DATA:
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iso_cb_(packet);
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break;
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default: {
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LOG_ALWAYS_FATAL("Bad packet type 0x%x",
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static_cast<int>(hci_packet_type_));
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}
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}
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return packet.size();
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}
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void H4Protocol::SendDataToPacketizer(uint8_t* buffer, size_t length) {
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std::vector<uint8_t> input_buffer{buffer, buffer + length};
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size_t buffer_offset = 0;
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while (buffer_offset < input_buffer.size()) {
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if (hci_packet_type_ == PacketType::UNKNOWN) {
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hci_packet_type_ =
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static_cast<PacketType>(input_buffer.data()[buffer_offset]);
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buffer_offset += 1;
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} else {
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bool packet_ready = hci_packetizer_.OnDataReady(
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hci_packet_type_, input_buffer, buffer_offset);
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if (packet_ready) {
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// Call packet callback and move offset.
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buffer_offset += OnPacketReady(hci_packetizer_.GetPacket());
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// Get ready for the next type byte.
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hci_packet_type_ = PacketType::UNKNOWN;
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} else {
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// The data was consumed, but there wasn't a packet.
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buffer_offset = input_buffer.size();
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}
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}
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}
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}
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void H4Protocol::OnDataReady() {
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if (disconnected_) {
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return;
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}
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uint8_t buffer[kMaxPacketLength];
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ssize_t bytes_read =
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TEMP_FAILURE_RETRY(read(uart_fd_, buffer, kMaxPacketLength));
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if (bytes_read == 0) {
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ALOGI("No bytes read, calling the disconnect callback");
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disconnected_ = true;
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disconnect_cb_();
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return;
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}
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if (bytes_read < 0) {
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ALOGW("error reading from UART (%s)", strerror(errno));
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return;
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}
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SendDataToPacketizer(buffer, bytes_read);
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}
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} // namespace android::hardware::bluetooth::hci
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