content: /*
   * Copyright (C) 2008 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;
  
  import static com.android.server.input.InputManagerService.SW_HEADPHONE_INSERT;
  import static com.android.server.input.InputManagerService.SW_HEADPHONE_INSERT_BIT;
  import static com.android.server.input.InputManagerService.SW_LINEOUT_INSERT;
  import static com.android.server.input.InputManagerService.SW_LINEOUT_INSERT_BIT;
  import static com.android.server.input.InputManagerService.SW_MICROPHONE_INSERT;
  import static com.android.server.input.InputManagerService.SW_MICROPHONE_INSERT_BIT;
  
  import android.content.Context;
  import android.media.AudioManager;
  import android.os.Handler;
  import android.os.Looper;
  import android.os.Message;
  import android.os.PowerManager;
  import android.os.PowerManager.WakeLock;
  import android.os.UEventObserver;
  import android.util.Log;
  import android.util.Pair;
  import android.util.Slog;
  import android.view.InputDevice;
  
  import com.android.internal.R;
  import com.android.server.input.InputManagerService;
  import com.android.server.input.InputManagerService.WiredAccessoryCallbacks;
  
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.FileReader;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Locale;
  
  /**
   * <p>WiredAccessoryManager monitors for a wired headset on the main board or dock using
   * both the InputManagerService notifyWiredAccessoryChanged interface and the UEventObserver
   * subsystem.
   */
  final class WiredAccessoryManager implements WiredAccessoryCallbacks {
      private static final String TAG = WiredAccessoryManager.class.getSimpleName();
      private static final boolean LOG = false;
  
      private static final int BIT_HEADSET = (1 << 0);
      private static final int BIT_HEADSET_NO_MIC = (1 << 1);
      private static final int BIT_USB_HEADSET_ANLG = (1 << 2);
      private static final int BIT_USB_HEADSET_DGTL = (1 << 3);
      private static final int BIT_HDMI_AUDIO = (1 << 4);
      private static final int BIT_LINEOUT = (1 << 5);
      private static final int SUPPORTED_HEADSETS = (BIT_HEADSET | BIT_HEADSET_NO_MIC |
              BIT_USB_HEADSET_ANLG | BIT_USB_HEADSET_DGTL |
              BIT_HDMI_AUDIO | BIT_LINEOUT);
  
      private static final String NAME_H2W = "h2w";
      private static final String NAME_USB_AUDIO = "usb_audio";
      private static final String NAME_HDMI_AUDIO = "hdmi_audio";
      private static final String NAME_HDMI = "hdmi";
  
      private static final int MSG_NEW_DEVICE_STATE = 1;
      private static final int MSG_SYSTEM_READY = 2;
  
      private final Object mLock = new Object();
  
      private final WakeLock mWakeLock;  // held while there is a pending route change
      private final AudioManager mAudioManager;
  
      private int mHeadsetState;
  
      private int mSwitchValues;
  
      private final WiredAccessoryObserver mObserver;
      private final WiredAccessoryExtconObserver mExtconObserver;
      private final InputManagerService mInputManager;
  
      private final boolean mUseDevInputEventForAudioJack;
  
      public WiredAccessoryManager(Context context, InputManagerService inputManager) {
          PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
          mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "WiredAccessoryManager");
          mWakeLock.setReferenceCounted(false);
          mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
          mInputManager = inputManager;
  
          mUseDevInputEventForAudioJack =
                  context.getResources().getBoolean(R.bool.config_useDevInputEventForAudioJack);
  
          mExtconObserver = new WiredAccessoryExtconObserver();
          mObserver = new WiredAccessoryObserver();
      }
  
      private void onSystemReady() {
          if (mUseDevInputEventForAudioJack) {
              int switchValues = 0;
              if (mInputManager.getSwitchState(-1, InputDevice.SOURCE_ANY, SW_HEADPHONE_INSERT)
                      == 1) {
                  switchValues |= SW_HEADPHONE_INSERT_BIT;
              }
              if (mInputManager.getSwitchState(-1, InputDevice.SOURCE_ANY, SW_MICROPHONE_INSERT)
                      == 1) {
                  switchValues |= SW_MICROPHONE_INSERT_BIT;
              }
              if (mInputManager.getSwitchState(-1, InputDevice.SOURCE_ANY, SW_LINEOUT_INSERT) == 1) {
                  switchValues |= SW_LINEOUT_INSERT_BIT;
              }
              notifyWiredAccessoryChanged(0, switchValues,
                      SW_HEADPHONE_INSERT_BIT | SW_MICROPHONE_INSERT_BIT | SW_LINEOUT_INSERT_BIT);
          }
  
  
          if (ExtconUEventObserver.extconExists()) {
              if (mUseDevInputEventForAudioJack) {
                  Log.w(TAG, "Both input event and extcon are used for audio jack,"
                          + " please just choose one.");
              }
              mExtconObserver.init();
          } else {
              mObserver.init();
          }
      }
  
      @Override
      public void notifyWiredAccessoryChanged(long whenNanos, int switchValues, int switchMask) {
          if (LOG) {
              Slog.v(TAG, "notifyWiredAccessoryChanged: when=" + whenNanos
                      + " bits=" + switchCodeToString(switchValues, switchMask)
                      + " mask=" + Integer.toHexString(switchMask));
          }
  
          synchronized (mLock) {
              int headset;
              mSwitchValues = (mSwitchValues & ~switchMask) | switchValues;
              switch (mSwitchValues &
                      (SW_HEADPHONE_INSERT_BIT | SW_MICROPHONE_INSERT_BIT | SW_LINEOUT_INSERT_BIT)) {
                  case 0:
                      headset = 0;
                      break;
  
                  case SW_HEADPHONE_INSERT_BIT:
                      headset = BIT_HEADSET_NO_MIC;
                      break;
  
                  case SW_LINEOUT_INSERT_BIT:
                      headset = BIT_LINEOUT;
                      break;
  
                  case SW_HEADPHONE_INSERT_BIT | SW_MICROPHONE_INSERT_BIT:
                      headset = BIT_HEADSET;
                      break;
  
                  case SW_MICROPHONE_INSERT_BIT:
                      headset = BIT_HEADSET;
                      break;
  
                  default:
                      headset = 0;
                      break;
              }
  
              updateLocked(NAME_H2W,
                      (mHeadsetState & ~(BIT_HEADSET | BIT_HEADSET_NO_MIC | BIT_LINEOUT)) | headset);
          }
      }
  
      @Override
      public void systemReady() {
          synchronized (mLock) {
              mWakeLock.acquire();
  
              Message msg = mHandler.obtainMessage(MSG_SYSTEM_READY, 0, 0, null);
              mHandler.sendMessage(msg);
          }
      }
  
      /**
       * Compare the existing headset state with the new state and pass along accordingly. Note
       * that this only supports a single headset at a time. Inserting both a usb and jacked headset
       * results in support for the last one plugged in. Similarly, unplugging either is seen as
       * unplugging all.
       *
       * @param newName  One of the NAME_xxx variables defined above.
       * @param newState 0 or one of the BIT_xxx variables defined above.
       */
      private void updateLocked(String newName, int newState) {
          // Retain only relevant bits
          int headsetState = newState & SUPPORTED_HEADSETS;
          int usb_headset_anlg = headsetState & BIT_USB_HEADSET_ANLG;
          int usb_headset_dgtl = headsetState & BIT_USB_HEADSET_DGTL;
          int h2w_headset = headsetState & (BIT_HEADSET | BIT_HEADSET_NO_MIC | BIT_LINEOUT);
          boolean h2wStateChange = true;
          boolean usbStateChange = true;
          if (LOG) {
              Slog.v(TAG, "newName=" + newName
                      + " newState=" + newState
                      + " headsetState=" + headsetState
                      + " prev headsetState=" + mHeadsetState);
          }
  
          if (mHeadsetState == headsetState) {
              Log.e(TAG, "No state change.");
              return;
          }
  
          // reject all suspect transitions: only accept state changes from:
          // - a: 0 headset to 1 headset
          // - b: 1 headset to 0 headset
          if (h2w_headset == (BIT_HEADSET | BIT_HEADSET_NO_MIC | BIT_LINEOUT)) {
              Log.e(TAG, "Invalid combination, unsetting h2w flag");
              h2wStateChange = false;
          }
          // - c: 0 usb headset to 1 usb headset
          // - d: 1 usb headset to 0 usb headset
          if (usb_headset_anlg == BIT_USB_HEADSET_ANLG && usb_headset_dgtl == BIT_USB_HEADSET_DGTL) {
              Log.e(TAG, "Invalid combination, unsetting usb flag");
              usbStateChange = false;
          }
          if (!h2wStateChange && !usbStateChange) {
              Log.e(TAG, "invalid transition, returning ...");
              return;
          }
  
          mWakeLock.acquire();
  
          Log.i(TAG, "MSG_NEW_DEVICE_STATE");
          Message msg = mHandler.obtainMessage(MSG_NEW_DEVICE_STATE, headsetState,
                  mHeadsetState, "");
          mHandler.sendMessage(msg);
  
          mHeadsetState = headsetState;
      }
  
      private final Handler mHandler = new Handler(Looper.myLooper(), null, true) {
          @Override
          public void handleMessage(Message msg) {
              switch (msg.what) {
                  case MSG_NEW_DEVICE_STATE:
                      setDevicesState(msg.arg1, msg.arg2, (String) msg.obj);
                      mWakeLock.release();
                      break;
                  case MSG_SYSTEM_READY:
                      onSystemReady();
                      mWakeLock.release();
                      break;
              }
          }
      };
  
      private void setDevicesState(
              int headsetState, int prevHeadsetState, String headsetName) {
          synchronized (mLock) {
              int allHeadsets = SUPPORTED_HEADSETS;
              for (int curHeadset = 1; allHeadsets != 0; curHeadset <<= 1) {
                  if ((curHeadset & allHeadsets) != 0) {
                      setDeviceStateLocked(curHeadset, headsetState, prevHeadsetState, headsetName);
                      allHeadsets &= ~curHeadset;
                  }
              }
          }
      }
  
      private void setDeviceStateLocked(int headset,
              int headsetState, int prevHeadsetState, String headsetName) {
          if ((headsetState & headset) != (prevHeadsetState & headset)) {
              int outDevice = 0;
              int inDevice = 0;
              int state;
  
              if ((headsetState & headset) != 0) {
                  state = 1;
              } else {
                  state = 0;
              }
  
              if (headset == BIT_HEADSET) {
                  outDevice = AudioManager.DEVICE_OUT_WIRED_HEADSET;
                  inDevice = AudioManager.DEVICE_IN_WIRED_HEADSET;
              } else if (headset == BIT_HEADSET_NO_MIC) {
                  outDevice = AudioManager.DEVICE_OUT_WIRED_HEADPHONE;
              } else if (headset == BIT_LINEOUT) {
                  outDevice = AudioManager.DEVICE_OUT_LINE;
              } else if (headset == BIT_USB_HEADSET_ANLG) {
                  outDevice = AudioManager.DEVICE_OUT_ANLG_DOCK_HEADSET;
              } else if (headset == BIT_USB_HEADSET_DGTL) {
                  outDevice = AudioManager.DEVICE_OUT_DGTL_DOCK_HEADSET;
              } else if (headset == BIT_HDMI_AUDIO) {
                  outDevice = AudioManager.DEVICE_OUT_HDMI;
              } else {
                  Slog.e(TAG, "setDeviceState() invalid headset type: " + headset);
                  return;
              }
  
              if (LOG) {
                  Slog.v(TAG, "headsetName: " + headsetName +
                          (state == 1 ? " connected" : " disconnected"));
              }
  
              if (outDevice != 0) {
                  mAudioManager.setWiredDeviceConnectionState(outDevice, state, "", headsetName);
              }
              if (inDevice != 0) {
                  mAudioManager.setWiredDeviceConnectionState(inDevice, state, "", headsetName);
              }
          }
      }
  
      private String switchCodeToString(int switchValues, int switchMask) {
          StringBuffer sb = new StringBuffer();
          if ((switchMask & SW_HEADPHONE_INSERT_BIT) != 0 &&
                  (switchValues & SW_HEADPHONE_INSERT_BIT) != 0) {
              sb.append("SW_HEADPHONE_INSERT ");
          }
          if ((switchMask & SW_MICROPHONE_INSERT_BIT) != 0 &&
                  (switchValues & SW_MICROPHONE_INSERT_BIT) != 0) {
              sb.append("SW_MICROPHONE_INSERT");
          }
          return sb.toString();
      }
  
      class WiredAccessoryObserver extends UEventObserver {
          private final List<UEventInfo> mUEventInfo;
  
          public WiredAccessoryObserver() {
              mUEventInfo = makeObservedUEventList();
          }
  
          void init() {
              synchronized (mLock) {
                  if (LOG) Slog.v(TAG, "init()");
                  char[] buffer = new char[1024];
  
                  for (int i = 0; i < mUEventInfo.size(); ++i) {
                      UEventInfo uei = mUEventInfo.get(i);
                      try {
                          int curState;
                          FileReader file = new FileReader(uei.getSwitchStatePath());
                          int len = file.read(buffer, 0, 1024);
                          file.close();
                          curState = Integer.parseInt((new String(buffer, 0, len)).trim());
  
                          if (curState > 0) {
                              updateStateLocked(uei.getDevPath(), uei.getDevName(), curState);
                          }
                      } catch (FileNotFoundException e) {
                          Slog.w(TAG, uei.getSwitchStatePath() +
                                  " not found while attempting to determine initial switch state");
                      } catch (Exception e) {
                          Slog.e(TAG, "Error while attempting to determine initial switch state for "
                                  + uei.getDevName(), e);
                      }
                  }
              }
  
              // At any given time accessories could be inserted
              // one on the board, one on the dock and one on HDMI:
              // observe three UEVENTs
              for (int i = 0; i < mUEventInfo.size(); ++i) {
                  UEventInfo uei = mUEventInfo.get(i);
                  startObserving("DEVPATH=" + uei.getDevPath());
              }
          }
  
          private List<UEventInfo> makeObservedUEventList() {
              List<UEventInfo> retVal = new ArrayList<UEventInfo>();
              UEventInfo uei;
  
              // Monitor h2w
              if (!mUseDevInputEventForAudioJack) {
                  uei = new UEventInfo(NAME_H2W, BIT_HEADSET, BIT_HEADSET_NO_MIC, BIT_LINEOUT);
                  if (uei.checkSwitchExists()) {
                      retVal.add(uei);
                  } else {
                      Slog.w(TAG, "This kernel does not have wired headset support");
                  }
              }
  
              // Monitor USB
              uei = new UEventInfo(NAME_USB_AUDIO, BIT_USB_HEADSET_ANLG, BIT_USB_HEADSET_DGTL, 0);
              if (uei.checkSwitchExists()) {
                  retVal.add(uei);
              } else {
                  Slog.w(TAG, "This kernel does not have usb audio support");
              }
  
              // Monitor HDMI
              //
              // If the kernel has support for the "hdmi_audio" switch, use that.  It will be
              // signalled only when the HDMI driver has a video mode configured, and the downstream
              // sink indicates support for audio in its EDID.
              //
              // If the kernel does not have an "hdmi_audio" switch, just fall back on the older
              // "hdmi" switch instead.
              uei = new UEventInfo(NAME_HDMI_AUDIO, BIT_HDMI_AUDIO, 0, 0);
              if (uei.checkSwitchExists()) {
                  retVal.add(uei);
              } else {
                  uei = new UEventInfo(NAME_HDMI, BIT_HDMI_AUDIO, 0, 0);
                  if (uei.checkSwitchExists()) {
                      retVal.add(uei);
                  } else {
                      Slog.w(TAG, "This kernel does not have HDMI audio support");
                  }
              }
  
              return retVal;
          }
  
          @Override
          public void onUEvent(UEventObserver.UEvent event) {
              if (LOG) Slog.v(TAG, "Headset UEVENT: " + event.toString());
  
              try {
                  String devPath = event.get("DEVPATH");
                  String name = event.get("SWITCH_NAME");
                  int state = Integer.parseInt(event.get("SWITCH_STATE"));
                  synchronized (mLock) {
                      updateStateLocked(devPath, name, state);
                  }
              } catch (NumberFormatException e) {
                  Slog.e(TAG, "Could not parse switch state from event " + event);
              }
          }
  
          private void updateStateLocked(String devPath, String name, int state) {
              for (int i = 0; i < mUEventInfo.size(); ++i) {
                  UEventInfo uei = mUEventInfo.get(i);
                  if (devPath.equals(uei.getDevPath())) {
                      updateLocked(name, uei.computeNewHeadsetState(mHeadsetState, state));
                      return;
                  }
              }
          }
  
          private final class UEventInfo {
              private final String mDevName;
              private final int mState1Bits;
              private final int mState2Bits;
              private final int mStateNbits;
  
              public UEventInfo(String devName, int state1Bits, int state2Bits, int stateNbits) {
                  mDevName = devName;
                  mState1Bits = state1Bits;
                  mState2Bits = state2Bits;
                  mStateNbits = stateNbits;
              }
  
              public String getDevName() {
                  return mDevName;
              }
  
              public String getDevPath() {
                  return String.format(Locale.US, "/devices/virtual/switch/%s", mDevName);
              }
  
              public String getSwitchStatePath() {
                  return String.format(Locale.US, "/sys/class/switch/%s/state", mDevName);
              }
  
              public boolean checkSwitchExists() {
                  File f = new File(getSwitchStatePath());
                  return f.exists();
              }
  
              public int computeNewHeadsetState(int headsetState, int switchState) {
                  int preserveMask = ~(mState1Bits | mState2Bits | mStateNbits);
                  int setBits = ((switchState == 1) ? mState1Bits :
                          ((switchState == 2) ? mState2Bits :
                                  ((switchState == mStateNbits) ? mStateNbits : 0)));
  
                  return ((headsetState & preserveMask) | setBits);
              }
          }
      }
  
      private class WiredAccessoryExtconObserver extends ExtconStateObserver<Pair<Integer, Integer>> {
          private final List<ExtconInfo> mExtconInfos;
  
          WiredAccessoryExtconObserver() {
              mExtconInfos = ExtconInfo.getExtconInfos(".*audio.*");
  
          }
  
          private void init() {
              for (ExtconInfo extconInfo : mExtconInfos) {
                  Pair<Integer, Integer> state = null;
                  try {
                      state = parseStateFromFile(extconInfo);
                  } catch (FileNotFoundException e) {
                      Slog.w(TAG, extconInfo.getStatePath()
                              + " not found while attempting to determine initial state", e);
                  } catch (IOException e) {
                      Slog.e(
                              TAG,
                              "Error reading " + extconInfo.getStatePath()
                                      + " while attempting to determine initial state",
                              e);
                  }
                  if (state != null) {
                      updateState(extconInfo, extconInfo.getName(), state);
                  }
                  if (LOG) Slog.d(TAG, "observing " + extconInfo.getName());
                  startObserving(extconInfo);
              }
  
          }
  
          @Override
          public Pair<Integer, Integer> parseState(ExtconInfo extconInfo, String status) {
              if (LOG) Slog.v(TAG, "status  " + status);
              int []maskAndState = {0,0};
              // extcon event state changes from kernel4.9
              // new state will be like STATE=MICROPHONE=1\nHEADPHONE=0
              updateBit(maskAndState, BIT_HEADSET_NO_MIC, status, "HEADPHONE") ;
              updateBit(maskAndState, BIT_HEADSET, status,"MICROPHONE") ;
              updateBit(maskAndState, BIT_HDMI_AUDIO, status,"HDMI") ;
              updateBit(maskAndState, BIT_LINEOUT, status,"LINE-OUT") ;
              if (LOG) Slog.v(TAG, "mask " + maskAndState[0] + " state " + maskAndState[1]);
              return Pair.create(maskAndState[0],maskAndState[1]);
          }
  
          @Override
          public void updateState(ExtconInfo extconInfo, String name,
                  Pair<Integer, Integer> maskAndState) {
              synchronized (mLock) {
                  int mask = maskAndState.first;
                  int state = maskAndState.second;
                  updateLocked(name, mHeadsetState & ~(mask & ~state) | (mask & state));
                  return;
              }
          }
      }
  
      /**
       * Updates the mask bit at {@code position} to 1 and the state bit at {@code position} to true
       * if {@code name=1}  or false if {}@code name=0} is contained in {@code state}.
       */
      private static void updateBit(int[] maskAndState, int position, String state, String name) {
          maskAndState[0] |= position;
          if (state.contains(name + "=1")) {
              maskAndState[0] |= position;
              maskAndState[1] |= position;
          } else if (state.contains(name + "=0")) {
              maskAndState[0] |= position;
              maskAndState[1] &= ~position;
          }
      }
  }
  