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      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.parseInt((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 }
    466