sdk/sources/android-23/com/android/server/WiredAccessoryManager.java

   1 /*
   2  * Copyright (C) 2008 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
  17 package com.android.server;
  18
  19 import android.content.Context;
  20 import android.os.Handler;
  21 import android.os.Looper;
  22 import android.os.Message;
  23 import android.os.PowerManager;
  24 import android.os.PowerManager.WakeLock;
  25 import android.os.UEventObserver;
  26 import android.util.Slog;
  27 import android.media.AudioManager;
  28 import android.util.Log;
  29 import android.view.InputDevice;
  30
  31 import com.android.internal.R;
  32 import com.android.server.input.InputManagerService;
  33 import com.android.server.input.InputManagerService.WiredAccessoryCallbacks;
  34 import static com.android.server.input.InputManagerService.SW_HEADPHONE_INSERT;
  35 import static com.android.server.input.InputManagerService.SW_MICROPHONE_INSERT;
  36 import static com.android.server.input.InputManagerService.SW_LINEOUT_INSERT;
  37 import static com.android.server.input.InputManagerService.SW_HEADPHONE_INSERT_BIT;
  38 import static com.android.server.input.InputManagerService.SW_MICROPHONE_INSERT_BIT;
  39 import static com.android.server.input.InputManagerService.SW_LINEOUT_INSERT_BIT;
  40
  41 import java.io.File;
  42 import java.io.FileReader;
  43 import java.io.FileNotFoundException;
  44 import java.util.ArrayList;
  45 import java.util.List;
  46 import java.util.Locale;
  47
  48 /**
  49  * <p>WiredAccessoryManager monitors for a wired headset on the main board or dock using
  50  * both the InputManagerService notifyWiredAccessoryChanged interface and the UEventObserver
  51  * subsystem.
  52  */
  53 final class WiredAccessoryManager implements WiredAccessoryCallbacks {
  54     private static final String TAG = WiredAccessoryManager.class.getSimpleName();
  55     private static final boolean LOG = true;
  56
  57     private static final int BIT_HEADSET = (1 << 0);
  58     private static final int BIT_HEADSET_NO_MIC = (1 << 1);
  59     private static final int BIT_USB_HEADSET_ANLG = (1 << 2);
  60     private static final int BIT_USB_HEADSET_DGTL = (1 << 3);
  61     private static final int BIT_HDMI_AUDIO = (1 << 4);
  62     private static final int BIT_LINEOUT = (1 << 5);
  63     private static final int SUPPORTED_HEADSETS = (BIT_HEADSET|BIT_HEADSET_NO_MIC|
  64                                                    BIT_USB_HEADSET_ANLG|BIT_USB_HEADSET_DGTL|
  65                                                    BIT_HDMI_AUDIO|BIT_LINEOUT);
  66
  67     private static final String NAME_H2W = "h2w";
  68     private static final String NAME_USB_AUDIO = "usb_audio";
  69     private static final String NAME_HDMI_AUDIO = "hdmi_audio";
  70     private static final String NAME_HDMI = "hdmi";
  71
  72     private static final int MSG_NEW_DEVICE_STATE = 1;
  73     private static final int MSG_SYSTEM_READY = 2;
  74
  75     private final Object mLock = new Object();
  76
  77     private final WakeLock mWakeLock;  // held while there is a pending route change
  78     private final AudioManager mAudioManager;
  79
  80     private int mHeadsetState;
  81
  82     private int mSwitchValues;
  83
  84     private final WiredAccessoryObserver mObserver;
  85     private final InputManagerService mInputManager;
  86
  87     private final boolean mUseDevInputEventForAudioJack;
  88
  89     public WiredAccessoryManager(Context context, InputManagerService inputManager) {
  90         PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
  91         mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "WiredAccessoryManager");
  92         mWakeLock.setReferenceCounted(false);
  93         mAudioManager = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);
  94         mInputManager = inputManager;
  95
  96         mUseDevInputEventForAudioJack =
  97                 context.getResources().getBoolean(R.bool.config_useDevInputEventForAudioJack);
  98
  99         mObserver = new WiredAccessoryObserver();
 100     }
 101
 102     private void onSystemReady() {
 103         if (mUseDevInputEventForAudioJack) {
 104             int switchValues = 0;
 105             if (mInputManager.getSwitchState(-1, InputDevice.SOURCE_ANY, SW_HEADPHONE_INSERT) == 1) {
 106                 switchValues |= SW_HEADPHONE_INSERT_BIT;
 107             }
 108             if (mInputManager.getSwitchState(-1, InputDevice.SOURCE_ANY, SW_MICROPHONE_INSERT) == 1) {
 109                 switchValues |= SW_MICROPHONE_INSERT_BIT;
 110             }
 111             if (mInputManager.getSwitchState(-1, InputDevice.SOURCE_ANY, SW_LINEOUT_INSERT) == 1) {
 112                 switchValues |= SW_LINEOUT_INSERT_BIT;
 113             }
 114             notifyWiredAccessoryChanged(0, switchValues,
 115                     SW_HEADPHONE_INSERT_BIT | SW_MICROPHONE_INSERT_BIT | SW_LINEOUT_INSERT_BIT);
 116         }
 117
 118         mObserver.init();
 119     }
 120
 121     @Override
 122     public void notifyWiredAccessoryChanged(long whenNanos, int switchValues, int switchMask) {
 123         if (LOG) Slog.v(TAG, "notifyWiredAccessoryChanged: when=" + whenNanos
 124                 + " bits=" + switchCodeToString(switchValues, switchMask)
 125                 + " mask=" + Integer.toHexString(switchMask));
 126
 127         synchronized (mLock) {
 128             int headset;
 129             mSwitchValues = (mSwitchValues & ~switchMask) | switchValues;
 130             switch (mSwitchValues &
 131                 (SW_HEADPHONE_INSERT_BIT | SW_MICROPHONE_INSERT_BIT | SW_LINEOUT_INSERT_BIT)) {
 132                 case 0:
 133                     headset = 0;
 134                     break;
 135
 136                 case SW_HEADPHONE_INSERT_BIT:
 137                     headset = BIT_HEADSET_NO_MIC;
 138                     break;
 139
 140                 case SW_LINEOUT_INSERT_BIT:
 141                     headset = BIT_LINEOUT;
 142                     break;
 143
 144                 case SW_HEADPHONE_INSERT_BIT | SW_MICROPHONE_INSERT_BIT:
 145                     headset = BIT_HEADSET;
 146                     break;
 147
 148                 case SW_MICROPHONE_INSERT_BIT:
 149                     headset = BIT_HEADSET;
 150                     break;
 151
 152                 default:
 153                     headset = 0;
 154                     break;
 155             }
 156
 157             updateLocked(NAME_H2W,
 158                 (mHeadsetState & ~(BIT_HEADSET | BIT_HEADSET_NO_MIC | BIT_LINEOUT)) | headset);
 159         }
 160     }
 161
 162     @Override
 163     public void systemReady() {
 164         synchronized (mLock) {
 165             mWakeLock.acquire();
 166
 167             Message msg = mHandler.obtainMessage(MSG_SYSTEM_READY, 0, 0, null);
 168             mHandler.sendMessage(msg);
 169         }
 170     }
 171
 172     /**
 173      * Compare the existing headset state with the new state and pass along accordingly. Note
 174      * that this only supports a single headset at a time. Inserting both a usb and jacked headset
 175      * results in support for the last one plugged in. Similarly, unplugging either is seen as
 176      * unplugging all.
 177      *
 178      * @param newName One of the NAME_xxx variables defined above.
 179      * @param newState 0 or one of the BIT_xxx variables defined above.
 180      */
 181     private void updateLocked(String newName, int newState) {
 182         // Retain only relevant bits
 183         int headsetState = newState & SUPPORTED_HEADSETS;
 184         int usb_headset_anlg = headsetState & BIT_USB_HEADSET_ANLG;
 185         int usb_headset_dgtl = headsetState & BIT_USB_HEADSET_DGTL;
 186         int h2w_headset = headsetState & (BIT_HEADSET | BIT_HEADSET_NO_MIC | BIT_LINEOUT);
 187         boolean h2wStateChange = true;
 188         boolean usbStateChange = true;
 189         if (LOG) Slog.v(TAG, "newName=" + newName
 190                 + " newState=" + newState
 191                 + " headsetState=" + headsetState
 192                 + " prev headsetState=" + mHeadsetState);
 193
 194         if (mHeadsetState == headsetState) {
 195             Log.e(TAG, "No state change.");
 196             return;
 197         }
 198
 199         // reject all suspect transitions: only accept state changes from:
 200         // - a: 0 headset to 1 headset
 201         // - b: 1 headset to 0 headset
 202         if (h2w_headset == (BIT_HEADSET | BIT_HEADSET_NO_MIC | BIT_LINEOUT)) {
 203             Log.e(TAG, "Invalid combination, unsetting h2w flag");
 204             h2wStateChange = false;
 205         }
 206         // - c: 0 usb headset to 1 usb headset
 207         // - d: 1 usb headset to 0 usb headset
 208         if (usb_headset_anlg == BIT_USB_HEADSET_ANLG && usb_headset_dgtl == BIT_USB_HEADSET_DGTL) {
 209             Log.e(TAG, "Invalid combination, unsetting usb flag");
 210             usbStateChange = false;
 211         }
 212         if (!h2wStateChange && !usbStateChange) {
 213             Log.e(TAG, "invalid transition, returning ...");
 214             return;
 215         }
 216
 217         mWakeLock.acquire();
 218
 219         Log.i(TAG, "MSG_NEW_DEVICE_STATE");
 220         Message msg = mHandler.obtainMessage(MSG_NEW_DEVICE_STATE, headsetState,
 221                 mHeadsetState, "");
 222         mHandler.sendMessage(msg);
 223
 224         mHeadsetState = headsetState;
 225     }
 226
 227     private final Handler mHandler = new Handler(Looper.myLooper(), null, true) {
 228         @Override
 229         public void handleMessage(Message msg) {
 230             switch (msg.what) {
 231                 case MSG_NEW_DEVICE_STATE:
 232                     setDevicesState(msg.arg1, msg.arg2, (String)msg.obj);
 233                     mWakeLock.release();
 234                     break;
 235                 case MSG_SYSTEM_READY:
 236                     onSystemReady();
 237                     mWakeLock.release();
 238                     break;
 239             }
 240         }
 241     };
 242
 243     private void setDevicesState(
 244             int headsetState, int prevHeadsetState, String headsetName) {
 245         synchronized (mLock) {
 246             int allHeadsets = SUPPORTED_HEADSETS;
 247             for (int curHeadset = 1; allHeadsets != 0; curHeadset <<= 1) {
 248                 if ((curHeadset & allHeadsets) != 0) {
 249                     setDeviceStateLocked(curHeadset, headsetState, prevHeadsetState, headsetName);
 250                     allHeadsets &= ~curHeadset;
 251                 }
 252             }
 253         }
 254     }
 255
 256     private void setDeviceStateLocked(int headset,
 257             int headsetState, int prevHeadsetState, String headsetName) {
 258         if ((headsetState & headset) != (prevHeadsetState & headset)) {
 259             int outDevice = 0;
 260             int inDevice = 0;
 261             int state;
 262
 263             if ((headsetState & headset) != 0) {
 264                 state = 1;
 265             } else {
 266                 state = 0;
 267             }
 268
 269             if (headset == BIT_HEADSET) {
 270                 outDevice = AudioManager.DEVICE_OUT_WIRED_HEADSET;
 271                 inDevice = AudioManager.DEVICE_IN_WIRED_HEADSET;
 272             } else if (headset == BIT_HEADSET_NO_MIC){
 273                 outDevice = AudioManager.DEVICE_OUT_WIRED_HEADPHONE;
 274             } else if (headset == BIT_LINEOUT){
 275                 outDevice = AudioManager.DEVICE_OUT_LINE;
 276             } else if (headset == BIT_USB_HEADSET_ANLG) {
 277                 outDevice = AudioManager.DEVICE_OUT_ANLG_DOCK_HEADSET;
 278             } else if (headset == BIT_USB_HEADSET_DGTL) {
 279                 outDevice = AudioManager.DEVICE_OUT_DGTL_DOCK_HEADSET;
 280             } else if (headset == BIT_HDMI_AUDIO) {
 281                 outDevice = AudioManager.DEVICE_OUT_HDMI;
 282             } else {
 283                 Slog.e(TAG, "setDeviceState() invalid headset type: "+headset);
 284                 return;
 285             }
 286
 287             if (LOG) {
 288                 Slog.v(TAG, "headsetName: " + headsetName +
 289                         (state == 1 ? " connected" : " disconnected"));
 290             }
 291
 292             if (outDevice != 0) {
 293               mAudioManager.setWiredDeviceConnectionState(outDevice, state, "", headsetName);
 294             }
 295             if (inDevice != 0) {
 296               mAudioManager.setWiredDeviceConnectionState(inDevice, state, "", headsetName);
 297             }
 298         }
 299     }
 300
 301     private String switchCodeToString(int switchValues, int switchMask) {
 302         StringBuffer sb = new StringBuffer();
 303         if ((switchMask & SW_HEADPHONE_INSERT_BIT) != 0 &&
 304                 (switchValues & SW_HEADPHONE_INSERT_BIT) != 0) {
 305             sb.append("SW_HEADPHONE_INSERT ");
 306         }
 307         if ((switchMask & SW_MICROPHONE_INSERT_BIT) != 0 &&
 308                 (switchValues & SW_MICROPHONE_INSERT_BIT) != 0) {
 309             sb.append("SW_MICROPHONE_INSERT");
 310         }
 311         return sb.toString();
 312     }
 313
 314     class WiredAccessoryObserver extends UEventObserver {
 315         private final List<UEventInfo> mUEventInfo;
 316
 317         public WiredAccessoryObserver() {
 318             mUEventInfo = makeObservedUEventList();
 319         }
 320
 321         void init() {
 322             synchronized (mLock) {
 323                 if (LOG) Slog.v(TAG, "init()");
 324                 char[] buffer = new char[1024];
 325
 326                 for (int i = 0; i < mUEventInfo.size(); ++i) {
 327                     UEventInfo uei = mUEventInfo.get(i);
 328                     try {
 329                         int curState;
 330                         FileReader file = new FileReader(uei.getSwitchStatePath());
 331                         int len = file.read(buffer, 0, 1024);
 332                         file.close();
 333                         curState = Integer.valueOf((new String(buffer, 0, len)).trim());
 334
 335                         if (curState > 0) {
 336                             updateStateLocked(uei.getDevPath(), uei.getDevName(), curState);
 337                         }
 338                     } catch (FileNotFoundException e) {
 339                         Slog.w(TAG, uei.getSwitchStatePath() +
 340                                 " not found while attempting to determine initial switch state");
 341                     } catch (Exception e) {
 342                         Slog.e(TAG, "" , e);
 343                     }
 344                 }
 345             }
 346
 347             // At any given time accessories could be inserted
 348             // one on the board, one on the dock and one on HDMI:
 349             // observe three UEVENTs
 350             for (int i = 0; i < mUEventInfo.size(); ++i) {
 351                 UEventInfo uei = mUEventInfo.get(i);
 352                 startObserving("DEVPATH="+uei.getDevPath());
 353             }
 354         }
 355
 356         private List<UEventInfo> makeObservedUEventList() {
 357             List<UEventInfo> retVal = new ArrayList<UEventInfo>();
 358             UEventInfo uei;
 359
 360             // Monitor h2w
 361             if (!mUseDevInputEventForAudioJack) {
 362                 uei = new UEventInfo(NAME_H2W, BIT_HEADSET, BIT_HEADSET_NO_MIC, BIT_LINEOUT);
 363                 if (uei.checkSwitchExists()) {
 364                     retVal.add(uei);
 365                 } else {
 366                     Slog.w(TAG, "This kernel does not have wired headset support");
 367                 }
 368             }
 369
 370             // Monitor USB
 371             uei = new UEventInfo(NAME_USB_AUDIO, BIT_USB_HEADSET_ANLG, BIT_USB_HEADSET_DGTL, 0);
 372             if (uei.checkSwitchExists()) {
 373                 retVal.add(uei);
 374             } else {
 375                 Slog.w(TAG, "This kernel does not have usb audio support");
 376             }
 377
 378             // Monitor HDMI
 379             //
 380             // If the kernel has support for the "hdmi_audio" switch, use that.  It will be
 381             // signalled only when the HDMI driver has a video mode configured, and the downstream
 382             // sink indicates support for audio in its EDID.
 383             //
 384             // If the kernel does not have an "hdmi_audio" switch, just fall back on the older
 385             // "hdmi" switch instead.
 386             uei = new UEventInfo(NAME_HDMI_AUDIO, BIT_HDMI_AUDIO, 0, 0);
 387             if (uei.checkSwitchExists()) {
 388                 retVal.add(uei);
 389             } else {
 390                 uei = new UEventInfo(NAME_HDMI, BIT_HDMI_AUDIO, 0, 0);
 391                 if (uei.checkSwitchExists()) {
 392                     retVal.add(uei);
 393                 } else {
 394                     Slog.w(TAG, "This kernel does not have HDMI audio support");
 395                 }
 396             }
 397
 398             return retVal;
 399         }
 400
 401         @Override
 402         public void onUEvent(UEventObserver.UEvent event) {
 403             if (LOG) Slog.v(TAG, "Headset UEVENT: " + event.toString());
 404
 405             try {
 406                 String devPath = event.get("DEVPATH");
 407                 String name = event.get("SWITCH_NAME");
 408                 int state = Integer.parseInt(event.get("SWITCH_STATE"));
 409                 synchronized (mLock) {
 410                     updateStateLocked(devPath, name, state);
 411                 }
 412             } catch (NumberFormatException e) {
 413                 Slog.e(TAG, "Could not parse switch state from event " + event);
 414             }
 415         }
 416
 417         private void updateStateLocked(String devPath, String name, int state) {
 418             for (int i = 0; i < mUEventInfo.size(); ++i) {
 419                 UEventInfo uei = mUEventInfo.get(i);
 420                 if (devPath.equals(uei.getDevPath())) {
 421                     updateLocked(name, uei.computeNewHeadsetState(mHeadsetState, state));
 422                     return;
 423                 }
 424             }
 425         }
 426
 427         private final class UEventInfo {
 428             private final String mDevName;
 429             private final int mState1Bits;
 430             private final int mState2Bits;
 431             private final int mStateNbits;
 432
 433             public UEventInfo(String devName, int state1Bits, int state2Bits, int stateNbits) {
 434                 mDevName = devName;
 435                 mState1Bits = state1Bits;
 436                 mState2Bits = state2Bits;
 437                 mStateNbits = stateNbits;
 438             }
 439
 440             public String getDevName() { return mDevName; }
 441
 442             public String getDevPath() {
 443                 return String.format(Locale.US, "/devices/virtual/switch/%s", mDevName);
 444             }
 445
 446             public String getSwitchStatePath() {
 447                 return String.format(Locale.US, "/sys/class/switch/%s/state", mDevName);
 448             }
 449
 450             public boolean checkSwitchExists() {
 451                 File f = new File(getSwitchStatePath());
 452                 return f.exists();
 453             }
 454
 455             public int computeNewHeadsetState(int headsetState, int switchState) {
 456                 int preserveMask = ~(mState1Bits | mState2Bits | mStateNbits);
 457                 int setBits = ((switchState == 1) ? mState1Bits :
 458                               ((switchState == 2) ? mState2Bits :
 459                               ((switchState == mStateNbits) ? mStateNbits : 0)));
 460
 461                 return ((headsetState & preserveMask) | setBits);
 462             }
 463         }
 464     }
 465 }