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      1 /*
      2  * Copyright (c) 2016, The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *     http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.car.hvac;
     17 
     18 import android.car.hardware.CarPropertyConfig;
     19 import android.car.hardware.hvac.CarHvacManager;
     20 import android.content.Context;
     21 
     22 import java.util.List;
     23 
     24 public class HvacPolicy {
     25     private float mMaxHardwareTemp;
     26     private float mMinHardwareTemp;
     27     private int mMaxHardwareFanSpeed;
     28 
     29     private final boolean mHardwareUsesCelsius;
     30     private final boolean mUserUsesCelsius;
     31 
     32     public HvacPolicy(Context context, List<CarPropertyConfig> properties) {
     33         //TODO handle max / min per each zone
     34         for (CarPropertyConfig config : properties) {
     35             switch (config.getPropertyId()) {
     36                 case CarHvacManager.ID_ZONED_FAN_SPEED_SETPOINT: {
     37                     mMaxHardwareFanSpeed = (int) config.getMaxValue();
     38                 } break;
     39 
     40                 case CarHvacManager.ID_ZONED_TEMP_SETPOINT: {
     41                     mMaxHardwareTemp = (float) config.getMaxValue();
     42                     mMinHardwareTemp = (float) config.getMinValue();
     43                 } break;
     44             }
     45         }
     46 
     47         mHardwareUsesCelsius = context.getResources().getBoolean(R.bool.config_hardwareUsesCelsius);
     48         mUserUsesCelsius = context.getResources().getBoolean(R.bool.config_userUsesCelsius);
     49     }
     50 
     51     public float userToHardwareTemp(int temp) {
     52         if (!mUserUsesCelsius && mHardwareUsesCelsius) {
     53             return fahrenheitToCelsius(temp);
     54         }
     55 
     56         if (mUserUsesCelsius && !mHardwareUsesCelsius) {
     57             return celsiusToFahrenheit(temp);
     58         }
     59 
     60         return temp;
     61     }
     62 
     63     public int hardwareToUserTemp(float temp) {
     64         if (mHardwareUsesCelsius && !mUserUsesCelsius) {
     65             return (int) celsiusToFahrenheit(temp);
     66         }
     67 
     68         if (!mHardwareUsesCelsius && mUserUsesCelsius) {
     69             return (int) fahrenheitToCelsius(temp);
     70         }
     71 
     72         return (int) temp;
     73     }
     74 
     75     private float celsiusToFahrenheit(float c) {
     76         return c * 9 / 5 + 32;
     77     }
     78 
     79     private float fahrenheitToCelsius(float f) {
     80         return (f - 32) * 5 / 9;
     81     }
     82 
     83     public int userToHardwareFanSpeed(int speed) {
     84         return getMaxHardwareFanSpeed() * speed / 100;
     85     }
     86 
     87     public int hardwareToUserFanSpeed(int speed) {
     88         return speed * 100 / getMaxHardwareFanSpeed();
     89     }
     90 
     91     public int getMaxHardwareFanSpeed() {
     92         return mMaxHardwareFanSpeed;
     93     }
     94 
     95     public float getMaxHardwareTemp() {
     96         return mMaxHardwareTemp;
     97     }
     98 
     99     public float getMinHardwareTemp() {
    100         return mMinHardwareTemp;
    101     }
    102 }
    103