text: /*
   * Copyright (C) 2020 The LineageOS 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 <android-base/file.h>
  #include <android-base/strings.h>
  
  #include <fstream>
  
  #include "AdaptiveBacklight.h"
  
  using android::base::ReadFileToString;
  using android::base::Trim;
  using android::base::WriteStringToFile;
  
  namespace vendor {
  namespace lineage {
  namespace livedisplay {
  namespace V2_0 {
  namespace samsung {
  
  static constexpr const char* kBacklightPath = "/sys/class/lcd/panel/alpm";
  
  bool AdaptiveBacklight::isSupported() {
      std::fstream backlight(kBacklightPath, backlight.in | backlight.out);
      return backlight.good();
  }
  
  // Methods from ::vendor::lineage::livedisplay::V2_0::IAdaptiveBacklight follow.
  Return<bool> AdaptiveBacklight::isEnabled() {
      std::string tmp;
      int32_t contents = 0;
  
      if (ReadFileToString(kBacklightPath, &tmp)) {
          contents = std::stoi(Trim(tmp));
      }
  
      return contents > 0;
  }
  
  Return<bool> AdaptiveBacklight::setEnabled(bool enabled) {
      return WriteStringToFile(enabled ? "2" : "0", kBacklightPath, true);
  }
  
  }  // namespace samsung
  }  // namespace V2_0
  }  // namespace livedisplay
  }  // namespace lineage
  }  // namespace vendor
  