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/*
* Copyright 2022 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.
*/
#define LOG_TAG "android.hardware.bluetooth.service.default"
#include "BluetoothHci.h"
#include <cutils/properties.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <poll.h>
#include <string.h>
#include <sys/uio.h>
#include <termios.h>
#include "log/log.h"
namespace {
int SetTerminalRaw(int fd) {
termios terminal_settings;
int rval = tcgetattr(fd, &terminal_settings);
if (rval < 0) {
return rval;
}
cfmakeraw(&terminal_settings);
rval = tcsetattr(fd, TCSANOW, &terminal_settings);
return rval;
}
} // namespace
using namespace ::android::hardware::bluetooth::hci;
using namespace ::android::hardware::bluetooth::async;
using aidl::android::hardware::bluetooth::Status;
namespace aidl::android::hardware::bluetooth::impl {
void OnDeath(void* cookie);
class BluetoothDeathRecipient {
public:
BluetoothDeathRecipient(BluetoothHci* hci) : mHci(hci) {}
void LinkToDeath(const std::shared_ptr<IBluetoothHciCallbacks>& cb) {
mCb = cb;
clientDeathRecipient_ = AIBinder_DeathRecipient_new(OnDeath);
auto linkToDeathReturnStatus = AIBinder_linkToDeath(
mCb->asBinder().get(), clientDeathRecipient_, this /* cookie */);
LOG_ALWAYS_FATAL_IF(linkToDeathReturnStatus != STATUS_OK,
"Unable to link to death recipient");
}
void UnlinkToDeath(const std::shared_ptr<IBluetoothHciCallbacks>& cb) {
LOG_ALWAYS_FATAL_IF(cb != mCb, "Unable to unlink mismatched pointers");
}
void serviceDied() {
if (mCb != nullptr && !AIBinder_isAlive(mCb->asBinder().get())) {
ALOGE("Bluetooth remote service has died");
} else {
ALOGE("BluetoothDeathRecipient::serviceDied called but service not dead");
return;
}
has_died_ = true;
mHci->close();
}
BluetoothHci* mHci;
std::shared_ptr<IBluetoothHciCallbacks> mCb;
AIBinder_DeathRecipient* clientDeathRecipient_;
bool getHasDied() const { return has_died_; }
private:
bool has_died_{false};
};
void OnDeath(void* cookie) {
auto* death_recipient = static_cast<BluetoothDeathRecipient*>(cookie);
death_recipient->serviceDied();
}
BluetoothHci::BluetoothHci(const std::string& dev_path) {
char property_bytes[PROPERTY_VALUE_MAX];
property_get("vendor.ser.bt-uart", property_bytes, dev_path.c_str());
mDevPath = std::string(property_bytes);
mDeathRecipient = std::make_shared<BluetoothDeathRecipient>(this);
}
int BluetoothHci::getFdFromDevPath() {
int fd = open(mDevPath.c_str(), O_RDWR);
if (fd < 0) {
ALOGE("Could not connect to bt: %s (%s)", mDevPath.c_str(),
strerror(errno));
return fd;
}
if (int ret = SetTerminalRaw(mFd) < 0) {
ALOGE("Could not make %s a raw terminal %d(%s)", mDevPath.c_str(), ret,
strerror(errno));
::close(fd);
return -1;
}
return fd;
}
ndk::ScopedAStatus BluetoothHci::initialize(
const std::shared_ptr<IBluetoothHciCallbacks>& cb) {
ALOGI(__func__);
mCb = cb;
if (mCb == nullptr) {
ALOGE("cb == nullptr! -> Unable to call initializationComplete(ERR)");
return ndk::ScopedAStatus::fromServiceSpecificError(STATUS_BAD_VALUE);
}
management_.reset(new NetBluetoothMgmt);
mFd = management_->openHci();
if (mFd < 0) {
management_.reset();
ALOGI("Unable to open Linux interface, trying default path.");
mFd = getFdFromDevPath();
if (mFd < 0) {
return ndk::ScopedAStatus::fromServiceSpecificError(STATUS_BAD_VALUE);
}
}
mDeathRecipient->LinkToDeath(mCb);
mH4 = std::make_shared<H4Protocol>(
mFd,
[](const std::vector<uint8_t>& /* raw_command */) {
LOG_ALWAYS_FATAL("Unexpected command!");
},
[this](const std::vector<uint8_t>& raw_event) {
mCb->hciEventReceived(raw_event);
},
[this](const std::vector<uint8_t>& raw_acl) {
mCb->hciEventReceived(raw_acl);
},
[this](const std::vector<uint8_t>& raw_sco) {
mCb->hciEventReceived(raw_sco);
},
[this](const std::vector<uint8_t>& raw_iso) {
mCb->hciEventReceived(raw_iso);
},
[this]() {
ALOGI("HCI socket device disconnected");
mFdWatcher.StopWatchingFileDescriptors();
});
mFdWatcher.WatchFdForNonBlockingReads(mFd,
[this](int) { mH4->OnDataReady(); });
ALOGI("initialization complete");
auto status = mCb->initializationComplete(Status::SUCCESS);
if (!status.isOk()) {
if (!mDeathRecipient->getHasDied()) {
ALOGE("Error sending init callback, but no death notification");
}
close();
return ndk::ScopedAStatus::fromServiceSpecificError(
STATUS_FAILED_TRANSACTION);
}
return ndk::ScopedAStatus::ok();
}
ndk::ScopedAStatus BluetoothHci::close() {
ALOGI(__func__);
mFdWatcher.StopWatchingFileDescriptors();
if (management_) {
management_->closeHci();
} else {
::close(mFd);
}
return ndk::ScopedAStatus::ok();
}
ndk::ScopedAStatus BluetoothHci::sendHciCommand(
const std::vector<uint8_t>& packet) {
send(PacketType::COMMAND, packet);
return ndk::ScopedAStatus::ok();
}
ndk::ScopedAStatus BluetoothHci::sendAclData(
const std::vector<uint8_t>& packet) {
send(PacketType::ACL_DATA, packet);
return ndk::ScopedAStatus::ok();
}
ndk::ScopedAStatus BluetoothHci::sendScoData(
const std::vector<uint8_t>& packet) {
send(PacketType::SCO_DATA, packet);
return ndk::ScopedAStatus::ok();
}
ndk::ScopedAStatus BluetoothHci::sendIsoData(
const std::vector<uint8_t>& packet) {
send(PacketType::ISO_DATA, packet);
return ndk::ScopedAStatus::ok();
}
void BluetoothHci::send(PacketType type, const std::vector<uint8_t>& v) {
mH4->Send(type, v);
}
} // namespace aidl::android::hardware::bluetooth::impl
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