92 lines
2.9 KiB
C++
92 lines
2.9 KiB
C++
//
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// Copyright 2017 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 <errno.h>
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#include <fcntl.h>
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#include <log/log.h>
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#include <sys/uio.h>
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namespace android {
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namespace hardware {
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namespace bluetooth {
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namespace hci {
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size_t H4Protocol::Send(uint8_t type, const uint8_t* data, size_t length) {
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struct iovec iov[] = {{&type, sizeof(type)},
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{const_cast<uint8_t*>(data), length}};
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ssize_t ret = 0;
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do {
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ret = TEMP_FAILURE_RETRY(writev(uart_fd_, iov, sizeof(iov) / sizeof(iov[0])));
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} while (-1 == ret && EAGAIN == errno);
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if (ret == -1) {
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ALOGE("%s error writing to UART (%s)", __func__, strerror(errno));
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} else if (ret < static_cast<ssize_t>(length + 1)) {
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ALOGE("%s: %d / %d bytes written - something went wrong...", __func__,
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static_cast<int>(ret), static_cast<int>(length + 1));
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}
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return ret;
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}
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void H4Protocol::OnPacketReady() {
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switch (hci_packet_type_) {
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case HCI_PACKET_TYPE_EVENT:
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event_cb_(hci_packetizer_.GetPacket());
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break;
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case HCI_PACKET_TYPE_ACL_DATA:
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acl_cb_(hci_packetizer_.GetPacket());
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break;
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case HCI_PACKET_TYPE_SCO_DATA:
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sco_cb_(hci_packetizer_.GetPacket());
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break;
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default:
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LOG_ALWAYS_FATAL("%s: Unimplemented packet type %d", __func__,
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static_cast<int>(hci_packet_type_));
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}
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// Get ready for the next type byte.
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hci_packet_type_ = HCI_PACKET_TYPE_UNKNOWN;
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}
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void H4Protocol::OnDataReady(int fd) {
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if (hci_packet_type_ == HCI_PACKET_TYPE_UNKNOWN) {
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uint8_t buffer[1] = {0};
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ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer, 1));
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if (bytes_read != 1) {
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if (bytes_read == 0) {
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LOG_ALWAYS_FATAL("%s: Unexpected EOF reading the packet type!",
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__func__);
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} else if (bytes_read < 0) {
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LOG_ALWAYS_FATAL("%s: Read packet type error: %s", __func__,
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strerror(errno));
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} else {
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LOG_ALWAYS_FATAL("%s: More bytes read than expected (%u)!", __func__,
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static_cast<unsigned int>(bytes_read));
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}
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}
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hci_packet_type_ = static_cast<HciPacketType>(buffer[0]);
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} else {
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hci_packetizer_.OnDataReady(fd, hci_packet_type_);
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}
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}
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} // namespace hci
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} // namespace bluetooth
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} // namespace hardware
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} // namespace android
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