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/*
* 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.
*/
package com.android.server.wifi;
import java.io.FileDescriptor;
import java.io.PrintWriter;
/**
* This class represents the list of SAR inputs that will be used to select the proper
* power profile.
* This includes:
* - SAR sensor status
* - Is there an ongoing voice call
* - Is SoftAP active
* It also contains info about state of the other Wifi modes
* - Client mode (Sta)
* - ScanOnly mode
* It also keeps history for the reporting of SAR states/scenario to avoid unnecessary reporting
* - keeps track of the last reported states
* - keeps track of the last reported SAR scenario
* - keeps track of if all wifi modes were disabled (no reporting should happen then)
*/
public class SarInfo {
/**
* This value is used as an initial value for the last reported scenario
* It is intended to be different than all valid SAR scenario values (including the
* reset value).
* Using this to initialize the lastReportedScenario results in that the first scenario
* (including reset) would be reported.
*/
public static final int INITIAL_SAR_SCENARIO = -2;
/**
* This value is used for the reset scenario (no TX Power backoff)
* Valid scenario values only include scenarios with Tx Power backoff,
* so we need this one to represent the "No backoff" case.
*/
public static final int RESET_SAR_SCENARIO = -1;
private static final String SAR_SENSOR_FREE_SPACE_STR = "SAR_SENSOR_FREE_SPACE";
private static final String SAR_SENSOR_NEAR_BODY_STR = "SAR_SENSOR_NEAR_BODY";
private static final String SAR_SENSOR_NEAR_HAND_STR = "SAR_SENSOR_NEAR_HAND";
private static final String SAR_SENSOR_NEAR_HEAD_STR = "SAR_SENSOR_NEAR_HEAD";
public static final int SAR_SENSOR_FREE_SPACE = 1;
public static final int SAR_SENSOR_NEAR_HAND = 2;
public static final int SAR_SENSOR_NEAR_HEAD = 3;
public static final int SAR_SENSOR_NEAR_BODY = 4;
/* For Logging */
private static final String TAG = "WifiSarInfo";
/* SAR support configs */
public boolean sarVoiceCallSupported;
public boolean sarSapSupported;
public boolean sarSensorSupported;
public int sensorState = SAR_SENSOR_FREE_SPACE;
public boolean isWifiClientEnabled = false;
public boolean isWifiSapEnabled = false;
public boolean isWifiScanOnlyEnabled = false;
public boolean isVoiceCall = false;
public boolean isEarPieceActive = false;
public int attemptedSarScenario = RESET_SAR_SCENARIO;
private boolean mAllWifiDisabled = true;
/* Variables representing the last successfully reported values to hal */
private int mLastReportedSensorState = SAR_SENSOR_FREE_SPACE;
private boolean mLastReportedIsWifiSapEnabled = false;
private boolean mLastReportedIsVoiceCall = false;
private boolean mLastReportedIsEarPieceActive = false;
private int mLastReportedScenario = INITIAL_SAR_SCENARIO;
private long mLastReportedScenarioTs = 0;
/**
* shouldReport()
* This method returns false in the following cases:
* 1. If all Wifi modes are disabled.
* 2. Values contributing to the SAR scenario selection have not changed
* since last successful reporting.
*
* Special cases to allow for devices that require setting the SAR scenario value
* when the chip comes up (initial startup, or during operation)
* 1. This method would report true even with unchanged values from last reporting,
* if any wifi mode is just enabled after all wifi modes were disabled.
* 2. This method would report true the first time it is called with any wifi mode enabled.
*/
public boolean shouldReport() {
/* Check if all Wifi modes are disabled */
if (!isWifiClientEnabled && !isWifiSapEnabled && !isWifiScanOnlyEnabled) {
mAllWifiDisabled = true;
return false;
}
/* Check if Wifi was all disabled before this call */
if (mAllWifiDisabled) {
return true;
}
/* Check if some change happened since last successful reporting */
if ((sensorState != mLastReportedSensorState)
|| (isWifiSapEnabled != mLastReportedIsWifiSapEnabled)
|| (isVoiceCall != mLastReportedIsVoiceCall)
|| (isEarPieceActive != mLastReportedIsEarPieceActive)) {
return true;
} else {
return false;
}
}
/**
* reportingSuccessful()
* This method is called when reporting SAR scenario is fully successful
* This results in caching the last reported inputs for future comparison.
*/
public void reportingSuccessful() {
mLastReportedSensorState = sensorState;
mLastReportedIsWifiSapEnabled = isWifiSapEnabled;
mLastReportedIsVoiceCall = isVoiceCall;
mLastReportedIsEarPieceActive = isEarPieceActive;
mLastReportedScenario = attemptedSarScenario;
mLastReportedScenarioTs = System.currentTimeMillis();
mAllWifiDisabled = false;
}
/**
* resetSarScenarioNeeded()
* Returns true if a call towards HAL to reset SAR scenario would be necessary.
* Returns false if the last call to HAL was already a reset, and hence
* another call to reset the SAR scenario would be redundant.
*/
public boolean resetSarScenarioNeeded() {
return setSarScenarioNeeded(RESET_SAR_SCENARIO);
}
/**
* setSarScenarioNeeded()
* Returns true if a call towards HAL to set SAR scenario to that value would be
* necessary. This happens in the following cases:
* 1. All Wifi modes were disabled, hence we need to init the SAR scenario value.
* 2. The new scenario is different from the last reported one.
*
* Returns false if the last call to HAL was to set the scenario to that value, hence,
* another call to set the SAR scenario to the same value would be redundant.
*/
public boolean setSarScenarioNeeded(int scenario) {
attemptedSarScenario = scenario;
if (mAllWifiDisabled || (mLastReportedScenario != scenario)) {
return true;
}
return false;
}
/**
* dump()
* Dumps the state of SarInfo
*/
public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
pw.println("Dump of SarInfo");
pw.println("Current values:");
pw.println(" Sensor state is: " + sensorStateToString(sensorState));
pw.println(" Voice Call state is: " + isVoiceCall);
pw.println(" Wifi Client state is: " + isWifiClientEnabled);
pw.println(" Wifi Soft AP state is: " + isWifiSapEnabled);
pw.println(" Wifi ScanOnly state is: " + isWifiScanOnlyEnabled);
pw.println(" Earpiece state is : " + isEarPieceActive);
pw.println("Last reported values:");
pw.println(" Sensor state is: " + sensorStateToString(mLastReportedSensorState));
pw.println(" Soft AP state is: " + mLastReportedIsWifiSapEnabled);
pw.println(" Voice Call state is: " + mLastReportedIsVoiceCall);
pw.println(" Earpiece state is: " + mLastReportedIsEarPieceActive);
pw.println("Last reported scenario: " + mLastReportedScenario);
pw.println("Reported " + (System.currentTimeMillis() - mLastReportedScenarioTs) / 1000
+ " seconds ago");
}
/**
* Convert SAR sensor state to string
*/
public static String sensorStateToString(int sensorState) {
switch(sensorState) {
case SAR_SENSOR_FREE_SPACE:
return SAR_SENSOR_FREE_SPACE_STR;
case SAR_SENSOR_NEAR_BODY:
return SAR_SENSOR_NEAR_BODY_STR;
case SAR_SENSOR_NEAR_HAND:
return SAR_SENSOR_NEAR_HAND_STR;
case SAR_SENSOR_NEAR_HEAD:
return SAR_SENSOR_NEAR_HEAD_STR;
default:
return "Invalid SAR sensor state";
}
}
}
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