sm6250-common: Import Pixel thermal HAL

* From hardware/google/pixel at 728fb99bbb910be05711421310efa6827aaaa4fa.

Change-Id: I763b4dbef65084cfee337065b2c5ab465f69bca8

thermal/utils/thermal_files.cpp

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2018 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 <algorithm>
+#include <string_view>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/strings.h>
+#include "thermal_files.h"
+
+namespace android {
+namespace hardware {
+namespace thermal {
+namespace V2_0 {
+namespace implementation {
+
+std::string ThermalFiles::getThermalFilePath(std::string_view thermal_name) const {
+    auto sensor_itr = thermal_name_to_path_map_.find(thermal_name.data());
+    if (sensor_itr == thermal_name_to_path_map_.end()) {
+        return "";
+    }
+    return sensor_itr->second;
+}
+
+bool ThermalFiles::addThermalFile(std::string_view thermal_name, std::string_view path) {
+    return thermal_name_to_path_map_.emplace(thermal_name, path).second;
+}
+
+bool ThermalFiles::readThermalFile(std::string_view thermal_name, std::string *data) const {
+    std::string sensor_reading;
+    std::string file_path = getThermalFilePath(std::string_view(thermal_name));
+    *data = "";
+    if (file_path.empty()) {
+        return false;
+    }
+
+    if (!::android::base::ReadFileToString(file_path, &sensor_reading)) {
+        PLOG(WARNING) << "Failed to read sensor: " << thermal_name;
+        return false;
+    }
+
+    // Strip the newline.
+    *data = ::android::base::Trim(sensor_reading);
+    return true;
+}
+
+}  // namespace implementation
+}  // namespace V2_0
+}  // namespace thermal
+}  // namespace hardware
+}  // namespace android