110 lines
3.7 KiB
C++
110 lines
3.7 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 <android-base/logging.h>
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#include <assert.h>
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#include <fcntl.h>
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#include <sys/uio.h>
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#include <utils/Log.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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/* 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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if (errno == EAGAIN) {
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ALOGE("%s error writing to UART (%s)", __func__, strerror(errno));
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continue;
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}
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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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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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case HCI_PACKET_TYPE_ISO_DATA:
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iso_cb_(hci_packetizer_.GetPacket());
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break;
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default: {
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bool bad_packet_type = true;
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CHECK(!bad_packet_type);
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}
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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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/**
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* read full buffer. ACL max length is 2 bytes, and SCO max length is 2
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* byte. so taking 64K as buffer length.
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* Question : Why to read in single chunk rather than multiple reads,
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* which can give parameter length arriving in response ?
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* Answer: The multiple reads does not work with BT USB dongle. At least
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* with Bluetooth 2.0 supported USB dongle. After first read, either
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* firmware/kernel (do not know who is responsible - inputs ??) driver
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* discard the whole message and successive read results in forever
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* blocking loop. - Is there any other way to make it work with multiple
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* reads, do not know yet (it can eliminate need of this function) ?
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* Reading in single shot gives expected response.
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*/
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const size_t max_plen = 64*1024;
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hidl_vec<uint8_t> tpkt;
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tpkt.resize(max_plen);
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size_t bytes_read = TEMP_FAILURE_RETRY(read(fd, tpkt.data(), max_plen));
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hci_packet_type_ = static_cast<HciPacketType>(tpkt.data()[0]);
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hci_packetizer_.CbHciPacket(tpkt.data()+1, bytes_read-1);
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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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