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