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//
// Copyright 2017 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "h4_protocol.h"
#define LOG_TAG "android.hardware.bluetooth-hci-h4"
#include <errno.h>
#include <fcntl.h>
#include <log/log.h>
#include <sys/uio.h>
#include <unistd.h>
namespace android {
namespace hardware {
namespace bluetooth {
namespace hci {
size_t H4Protocol::Send(uint8_t type, const uint8_t* data, size_t length) {
struct iovec iov_array[] = {{&type, sizeof(type)},
{const_cast<uint8_t*>(data), length}};
struct iovec* iov = iov_array;
int iovcnt = sizeof(iov_array) / sizeof(iov_array[0]);
size_t total_bytes = 0;
for (int i = 0; i < iovcnt; i++) {
total_bytes += iov_array[i].iov_len;
}
size_t bytes_written = 0;
size_t remaining_bytes = total_bytes;
while (remaining_bytes > 0) {
ssize_t ret = TEMP_FAILURE_RETRY(writev(uart_fd_, iov, iovcnt));
if (ret == -1) {
if (errno == EAGAIN) continue;
ALOGE("%s error writing to UART (%s)", __func__, strerror(errno));
break;
} else if (ret == 0) {
// Nothing written
ALOGE("%s zero bytes written - something went wrong...", __func__);
break;
} else if (ret == remaining_bytes) {
// Everything written
bytes_written += ret;
break;
}
bytes_written += ret;
remaining_bytes -= ret;
ALOGW("%s: %d/%d bytes written - retrying remaining %d bytes", __func__,
static_cast<int>(bytes_written), static_cast<int>(total_bytes),
static_cast<int>(remaining_bytes));
// Remove iovs which are written from the list
while (ret >= iov->iov_len) {
ret -= iov->iov_len;
++iov;
--iovcnt;
}
// Adjust the iov to point to the remaining data which needs to be written
if (ret) {
iov->iov_base = static_cast<uint8_t*>(iov->iov_base) + ret;
iov->iov_len -= ret;
}
}
return bytes_written;
}
void H4Protocol::OnPacketReady() {
switch (hci_packet_type_) {
case HCI_PACKET_TYPE_EVENT:
event_cb_(hci_packetizer_.GetPacket());
break;
case HCI_PACKET_TYPE_ACL_DATA:
acl_cb_(hci_packetizer_.GetPacket());
break;
case HCI_PACKET_TYPE_SCO_DATA:
sco_cb_(hci_packetizer_.GetPacket());
break;
case HCI_PACKET_TYPE_ISO_DATA:
iso_cb_(hci_packetizer_.GetPacket());
break;
default:
LOG_ALWAYS_FATAL("%s: Unimplemented packet type %d", __func__,
static_cast<int>(hci_packet_type_));
}
// Get ready for the next type byte.
hci_packet_type_ = HCI_PACKET_TYPE_UNKNOWN;
}
void H4Protocol::OnDataReady(int fd) {
if (hci_packet_type_ == HCI_PACKET_TYPE_UNKNOWN) {
uint8_t buffer[1] = {0};
ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer, 1));
if (bytes_read != 1) {
if (bytes_read == 0) {
// This is only expected if the UART got closed when shutting down.
ALOGE("%s: Unexpected EOF reading the packet type!", __func__);
sleep(5); // Expect to be shut down within 5 seconds.
return;
} else if (bytes_read < 0) {
LOG_ALWAYS_FATAL("%s: Read packet type error: %s", __func__,
strerror(errno));
} else {
LOG_ALWAYS_FATAL("%s: More bytes read than expected (%u)!", __func__,
static_cast<unsigned int>(bytes_read));
}
}
hci_packet_type_ = static_cast<HciPacketType>(buffer[0]);
if (hci_packet_type_ != HCI_PACKET_TYPE_ACL_DATA &&
hci_packet_type_ != HCI_PACKET_TYPE_SCO_DATA &&
hci_packet_type_ != HCI_PACKET_TYPE_ISO_DATA &&
hci_packet_type_ != HCI_PACKET_TYPE_EVENT) {
LOG_ALWAYS_FATAL("%s: Unimplemented packet type %d", __func__,
static_cast<int>(hci_packet_type_));
}
} else {
hci_packetizer_.OnDataReady(fd, hci_packet_type_);
}
}
} // namespace hci
} // namespace bluetooth
} // namespace hardware
} // namespace android
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