Read GNSS measurement from device file when available
Test: atest CtsLocationGnssTestCases GtsLocationTestCases on CF
Bug: 190757198
Change-Id: Ic03d56a5df6b99f7b20c5840e7091ead138316b1
diff --git a/gnss/common/utils/default/DeviceFileReader.cpp b/gnss/common/utils/default/DeviceFileReader.cpp
new file mode 100644
index 0000000..7d4fb04
--- /dev/null
+++ b/gnss/common/utils/default/DeviceFileReader.cpp
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2021 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 "DeviceFileReader.h"
+
+namespace android {
+namespace hardware {
+namespace gnss {
+namespace common {
+
+void DeviceFileReader::getDataFromDeviceFile(const std::string& command, int mMinIntervalMs) {
+ char inputBuffer[INPUT_BUFFER_SIZE];
+ int mGnssFd = open(ReplayUtils::getGnssPath().c_str(),
+ O_RDWR | O_NONBLOCK);
+
+ if (mGnssFd == -1) {
+ return;
+ }
+
+ int bytes_write = write(mGnssFd, command.c_str(), command.size());
+ if (bytes_write <= 0) {
+ close(mGnssFd);
+ return;
+ }
+
+ struct epoll_event ev, events[1];
+ ev.data.fd = mGnssFd;
+ ev.events = EPOLLIN;
+ int epoll_fd = epoll_create1(0);
+ epoll_ctl(epoll_fd, EPOLL_CTL_ADD, mGnssFd, &ev);
+ int bytes_read = -1;
+ std::string inputStr = "";
+ int epoll_ret = epoll_wait(epoll_fd, events, 1, mMinIntervalMs);
+
+ if (epoll_ret == -1) {
+ close(mGnssFd);
+ return;
+ }
+ while (true) {
+ memset(inputBuffer, 0, INPUT_BUFFER_SIZE);
+ bytes_read = read(mGnssFd, &inputBuffer, INPUT_BUFFER_SIZE);
+ if (bytes_read <= 0) {
+ break;
+ }
+ s_buffer_ += std::string(inputBuffer, bytes_read);
+ }
+ close(mGnssFd);
+
+ // Trim end of file mark(\n\n\n\n).
+ auto pos = s_buffer_.find("\n\n\n\n");
+ if (pos != std::string::npos) {
+ inputStr = s_buffer_.substr(0, pos);
+ s_buffer_ = s_buffer_.substr(pos + 4);
+ } else {
+ return;
+ }
+
+ // Cache the injected data.
+ if (ReplayUtils::isGnssRawMeasurement(inputStr)) {
+ data_[CMD_GET_RAWMEASUREMENT] = inputStr;
+ } else if (ReplayUtils::isNMEA(inputStr)) {
+ data_[CMD_GET_LOCATION] = inputStr;
+ }
+}
+
+std::string DeviceFileReader::getLocationData() {
+ std::unique_lock<std::mutex> lock(mMutex);
+ getDataFromDeviceFile(CMD_GET_LOCATION, 20);
+ return data_[CMD_GET_LOCATION];
+}
+
+std::string DeviceFileReader::getGnssRawMeasurementData() {
+ std::unique_lock<std::mutex> lock(mMutex);
+ getDataFromDeviceFile(CMD_GET_RAWMEASUREMENT, 20);
+ return data_[CMD_GET_RAWMEASUREMENT];
+}
+
+DeviceFileReader::DeviceFileReader() {}
+
+DeviceFileReader::~DeviceFileReader() {}
+
+} // namespace common
+} // namespace gnss
+} // namespace hardware
+} // namespace android