text: /*
   * Copyright (C) 2017 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.
   */
  
  #define LOG_TAG "LightService"
  
  #include <log/log.h>
  
  #include "Light.h"
  
  #include <fstream>
  
  namespace android {
  namespace hardware {
  namespace light {
  namespace V2_0 {
  namespace implementation {
  
  #define LED_LIGHT_OFF 0
  #define LED_LIGHT_ON  1
  
  #define LEDS            "/sys/class/leds/"
  
  #define LCD_LED         LEDS "lcd-backlight/"
  #define CHARGING_LED    LEDS "charging/"
  
  #define BRIGHTNESS      "brightness"
  
  
  /*
   * Write value to path and close file.
   */
  static void set(std::string path, std::string value) {
      std::ofstream file(path);
      file << value;
  }
  
  static void set(std::string path, int value) {
      set(path, std::to_string(value));
  }
  
  static uint32_t is_lit(const LightState& state) {
      return state.color & 0x00ffffff;
  }
  
  static uint32_t rgbToBrightness(const LightState& state) {
      uint32_t color = state.color & 0x00ffffff;
      return ((77 * ((color >> 16) & 0xff)) + (150 * ((color >> 8) & 0xff)) +
              (29 * (color & 0xff))) >> 8;
  }
  
  static void handleBacklight(const LightState& state) {
      uint32_t brightness = rgbToBrightness(state);
      set(LCD_LED BRIGHTNESS, brightness);
  }
  
  static void handleNotification(const LightState& state) {
      uint32_t Brightness;
  
      if (is_lit(state))
          Brightness = LED_LIGHT_ON;
      else
          Brightness = LED_LIGHT_OFF;
      
       set(CHARGING_LED BRIGHTNESS, Brightness);
  }
  
  
  static std::map<Type, std::function<void(const LightState&)>> lights = {
      {Type::BACKLIGHT, handleBacklight},
      {Type::BATTERY, handleNotification},
      {Type::NOTIFICATIONS, handleNotification},
      {Type::ATTENTION, handleNotification},
  };
  
  Light::Light() {}
  
  Return<Status> Light::setLight(Type type, const LightState& state) {
      auto it = lights.find(type);
  
      if (it == lights.end()) {
          return Status::LIGHT_NOT_SUPPORTED;
      }
  
      /*
       * Lock global mutex until light state is updated.
       */
      std::lock_guard<std::mutex> lock(globalLock);
  
      it->second(state);
  
      return Status::SUCCESS;
  }
  
  Return<void> Light::getSupportedTypes(getSupportedTypes_cb _hidl_cb) {
      std::vector<Type> types;
  
      for (auto const& light : lights) types.push_back(light.first);
  
      _hidl_cb(types);
  
      return Void();
  }
  
  }  // namespace implementation
  }  // namespace V2_0
  }  // namespace light
  }  // namespace hardware
  }  // namespace android
  
  