sm6250-common: Import Pixel thermal HAL

* From hardware/google/pixel at 728fb99bbb910be05711421310efa6827aaaa4fa.

Change-Id: I763b4dbef65084cfee337065b2c5ab465f69bca8

thermal/utils/thermal_files.h

@@ -0,0 +1,55 @@
+/*
+ * 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.
+ */
+
+#ifndef THERMAL_UTILS_THERMAL_FILES_H_
+#define THERMAL_UTILS_THERMAL_FILES_H_
+
+#include <string>
+#include <unordered_map>
+
+namespace android {
+namespace hardware {
+namespace thermal {
+namespace V2_0 {
+namespace implementation {
+
+class ThermalFiles {
+  public:
+    ThermalFiles() = default;
+    ~ThermalFiles() = default;
+    ThermalFiles(const ThermalFiles &) = delete;
+    void operator=(const ThermalFiles &) = delete;
+
+    std::string getThermalFilePath(std::string_view thermal_name) const;
+    // Returns true if add was successful, false otherwise.
+    bool addThermalFile(std::string_view thermal_name, std::string_view path);
+    // If thermal_name is not found in the thermal names to path map, this will set
+    // data to empty and return false. If the thermal_name is found and its content
+    // is read, this function will fill in data accordingly then return true.
+    bool readThermalFile(std::string_view thermal_name, std::string *data) const;
+    size_t getNumThermalFiles() const { return thermal_name_to_path_map_.size(); }
+
+  private:
+    std::unordered_map<std::string, std::string> thermal_name_to_path_map_;
+};
+
+}  // namespace implementation
+}  // namespace V2_0
+}  // namespace thermal
+}  // namespace hardware
+}  // namespace android
+
+#endif  // THERMAL_UTILS_THERMAL_FILES_H_