WiredAccessoryManager.java revision 948d32748caaac5be06c991ebf00f74265a7849f
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 17package com.android.server; 18 19import android.content.BroadcastReceiver; 20import android.content.Context; 21import android.content.Intent; 22import android.content.IntentFilter; 23import android.os.Handler; 24import android.os.Looper; 25import android.os.Message; 26import android.os.PowerManager; 27import android.os.PowerManager.WakeLock; 28import android.os.UEventObserver; 29import android.util.Slog; 30import android.media.AudioManager; 31import android.util.Log; 32import android.view.InputDevice; 33 34import com.android.internal.R; 35import com.android.server.input.InputManagerService; 36import com.android.server.input.InputManagerService.WiredAccessoryCallbacks; 37import static com.android.server.input.InputManagerService.SW_HEADPHONE_INSERT; 38import static com.android.server.input.InputManagerService.SW_MICROPHONE_INSERT; 39import static com.android.server.input.InputManagerService.SW_HEADPHONE_INSERT_BIT; 40import static com.android.server.input.InputManagerService.SW_MICROPHONE_INSERT_BIT; 41 42import java.io.File; 43import java.io.FileReader; 44import java.io.FileNotFoundException; 45import java.util.ArrayList; 46import java.util.List; 47import java.util.Locale; 48 49/** 50 * <p>WiredAccessoryManager monitors for a wired headset on the main board or dock using 51 * both the InputManagerService notifyWiredAccessoryChanged interface and the UEventObserver 52 * subsystem. 53 */ 54final class WiredAccessoryManager implements WiredAccessoryCallbacks { 55 private static final String TAG = WiredAccessoryManager.class.getSimpleName(); 56 private static final boolean LOG = true; 57 58 private static final int BIT_HEADSET = (1 << 0); 59 private static final int BIT_HEADSET_NO_MIC = (1 << 1); 60 private static final int BIT_USB_HEADSET_ANLG = (1 << 2); 61 private static final int BIT_USB_HEADSET_DGTL = (1 << 3); 62 private static final int BIT_HDMI_AUDIO = (1 << 4); 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); 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 notifyWiredAccessoryChanged(0, switchValues, 112 SW_HEADPHONE_INSERT_BIT | SW_MICROPHONE_INSERT_BIT); 113 } 114 115 mObserver.init(); 116 } 117 118 @Override 119 public void notifyWiredAccessoryChanged(long whenNanos, int switchValues, int switchMask) { 120 if (LOG) Slog.v(TAG, "notifyWiredAccessoryChanged: when=" + whenNanos 121 + " bits=" + switchCodeToString(switchValues, switchMask) 122 + " mask=" + Integer.toHexString(switchMask)); 123 124 synchronized (mLock) { 125 int headset; 126 mSwitchValues = (mSwitchValues & ~switchMask) | switchValues; 127 switch (mSwitchValues & (SW_HEADPHONE_INSERT_BIT | SW_MICROPHONE_INSERT_BIT)) { 128 case 0: 129 headset = 0; 130 break; 131 132 case SW_HEADPHONE_INSERT_BIT: 133 headset = BIT_HEADSET_NO_MIC; 134 break; 135 136 case SW_HEADPHONE_INSERT_BIT | SW_MICROPHONE_INSERT_BIT: 137 headset = BIT_HEADSET; 138 break; 139 140 case SW_MICROPHONE_INSERT_BIT: 141 headset = BIT_HEADSET; 142 break; 143 144 default: 145 headset = 0; 146 break; 147 } 148 149 updateLocked(NAME_H2W, (mHeadsetState & ~(BIT_HEADSET | BIT_HEADSET_NO_MIC)) | headset); 150 } 151 } 152 153 @Override 154 public void systemReady() { 155 synchronized (mLock) { 156 mWakeLock.acquire(); 157 158 Message msg = mHandler.obtainMessage(MSG_SYSTEM_READY, 0, 0, null); 159 mHandler.sendMessage(msg); 160 } 161 } 162 163 /** 164 * Compare the existing headset state with the new state and pass along accordingly. Note 165 * that this only supports a single headset at a time. Inserting both a usb and jacked headset 166 * results in support for the last one plugged in. Similarly, unplugging either is seen as 167 * unplugging all. 168 * 169 * @param newName One of the NAME_xxx variables defined above. 170 * @param newState 0 or one of the BIT_xxx variables defined above. 171 */ 172 private void updateLocked(String newName, int newState) { 173 // Retain only relevant bits 174 int headsetState = newState & SUPPORTED_HEADSETS; 175 int usb_headset_anlg = headsetState & BIT_USB_HEADSET_ANLG; 176 int usb_headset_dgtl = headsetState & BIT_USB_HEADSET_DGTL; 177 int h2w_headset = headsetState & (BIT_HEADSET | BIT_HEADSET_NO_MIC); 178 boolean h2wStateChange = true; 179 boolean usbStateChange = true; 180 if (LOG) Slog.v(TAG, "newName=" + newName 181 + " newState=" + newState 182 + " headsetState=" + headsetState 183 + " prev headsetState=" + mHeadsetState); 184 185 if (mHeadsetState == headsetState) { 186 Log.e(TAG, "No state change."); 187 return; 188 } 189 190 // reject all suspect transitions: only accept state changes from: 191 // - a: 0 headset to 1 headset 192 // - b: 1 headset to 0 headset 193 if (h2w_headset == (BIT_HEADSET | BIT_HEADSET_NO_MIC)) { 194 Log.e(TAG, "Invalid combination, unsetting h2w flag"); 195 h2wStateChange = false; 196 } 197 // - c: 0 usb headset to 1 usb headset 198 // - d: 1 usb headset to 0 usb headset 199 if (usb_headset_anlg == BIT_USB_HEADSET_ANLG && usb_headset_dgtl == BIT_USB_HEADSET_DGTL) { 200 Log.e(TAG, "Invalid combination, unsetting usb flag"); 201 usbStateChange = false; 202 } 203 if (!h2wStateChange && !usbStateChange) { 204 Log.e(TAG, "invalid transition, returning ..."); 205 return; 206 } 207 208 mWakeLock.acquire(); 209 210 Message msg = mHandler.obtainMessage(MSG_NEW_DEVICE_STATE, headsetState, 211 mHeadsetState, newName); 212 mHandler.sendMessage(msg); 213 214 mHeadsetState = headsetState; 215 } 216 217 private final Handler mHandler = new Handler(Looper.myLooper(), null, true) { 218 @Override 219 public void handleMessage(Message msg) { 220 switch (msg.what) { 221 case MSG_NEW_DEVICE_STATE: 222 setDevicesState(msg.arg1, msg.arg2, (String)msg.obj); 223 mWakeLock.release(); 224 break; 225 case MSG_SYSTEM_READY: 226 onSystemReady(); 227 mWakeLock.release(); 228 break; 229 } 230 } 231 }; 232 233 private void setDevicesState( 234 int headsetState, int prevHeadsetState, String headsetName) { 235 synchronized (mLock) { 236 int allHeadsets = SUPPORTED_HEADSETS; 237 for (int curHeadset = 1; allHeadsets != 0; curHeadset <<= 1) { 238 if ((curHeadset & allHeadsets) != 0) { 239 setDeviceStateLocked(curHeadset, headsetState, prevHeadsetState, headsetName); 240 allHeadsets &= ~curHeadset; 241 } 242 } 243 } 244 } 245 246 private void setDeviceStateLocked(int headset, 247 int headsetState, int prevHeadsetState, String headsetName) { 248 if ((headsetState & headset) != (prevHeadsetState & headset)) { 249 int device; 250 int state; 251 252 if ((headsetState & headset) != 0) { 253 state = 1; 254 } else { 255 state = 0; 256 } 257 258 if (headset == BIT_HEADSET) { 259 device = AudioManager.DEVICE_OUT_WIRED_HEADSET; 260 } else if (headset == BIT_HEADSET_NO_MIC){ 261 device = AudioManager.DEVICE_OUT_WIRED_HEADPHONE; 262 } else if (headset == BIT_USB_HEADSET_ANLG) { 263 device = AudioManager.DEVICE_OUT_ANLG_DOCK_HEADSET; 264 } else if (headset == BIT_USB_HEADSET_DGTL) { 265 device = AudioManager.DEVICE_OUT_DGTL_DOCK_HEADSET; 266 } else if (headset == BIT_HDMI_AUDIO) { 267 device = AudioManager.DEVICE_OUT_HDMI; 268 } else { 269 Slog.e(TAG, "setDeviceState() invalid headset type: "+headset); 270 return; 271 } 272 273 if (LOG) 274 Slog.v(TAG, "device "+headsetName+((state == 1) ? " connected" : " disconnected")); 275 276 mAudioManager.setWiredDeviceConnectionState(device, state, headsetName); 277 } 278 } 279 280 private String switchCodeToString(int switchValues, int switchMask) { 281 StringBuffer sb = new StringBuffer(); 282 if ((switchMask & SW_HEADPHONE_INSERT_BIT) != 0 && 283 (switchValues & SW_HEADPHONE_INSERT_BIT) != 0) { 284 sb.append("SW_HEADPHONE_INSERT "); 285 } 286 if ((switchMask & SW_MICROPHONE_INSERT_BIT) != 0 && 287 (switchValues & SW_MICROPHONE_INSERT_BIT) != 0) { 288 sb.append("SW_MICROPHONE_INSERT"); 289 } 290 return sb.toString(); 291 } 292 293 class WiredAccessoryObserver extends UEventObserver { 294 private final List<UEventInfo> mUEventInfo; 295 296 public WiredAccessoryObserver() { 297 mUEventInfo = makeObservedUEventList(); 298 } 299 300 void init() { 301 synchronized (mLock) { 302 if (LOG) Slog.v(TAG, "init()"); 303 char[] buffer = new char[1024]; 304 305 for (int i = 0; i < mUEventInfo.size(); ++i) { 306 UEventInfo uei = mUEventInfo.get(i); 307 try { 308 int curState; 309 FileReader file = new FileReader(uei.getSwitchStatePath()); 310 int len = file.read(buffer, 0, 1024); 311 file.close(); 312 curState = Integer.valueOf((new String(buffer, 0, len)).trim()); 313 314 if (curState > 0) { 315 updateStateLocked(uei.getDevPath(), uei.getDevName(), curState); 316 } 317 } catch (FileNotFoundException e) { 318 Slog.w(TAG, uei.getSwitchStatePath() + 319 " not found while attempting to determine initial switch state"); 320 } catch (Exception e) { 321 Slog.e(TAG, "" , e); 322 } 323 } 324 } 325 326 // At any given time accessories could be inserted 327 // one on the board, one on the dock and one on HDMI: 328 // observe three UEVENTs 329 for (int i = 0; i < mUEventInfo.size(); ++i) { 330 UEventInfo uei = mUEventInfo.get(i); 331 startObserving("DEVPATH="+uei.getDevPath()); 332 } 333 } 334 335 private List<UEventInfo> makeObservedUEventList() { 336 List<UEventInfo> retVal = new ArrayList<UEventInfo>(); 337 UEventInfo uei; 338 339 // Monitor h2w 340 if (!mUseDevInputEventForAudioJack) { 341 uei = new UEventInfo(NAME_H2W, BIT_HEADSET, BIT_HEADSET_NO_MIC); 342 if (uei.checkSwitchExists()) { 343 retVal.add(uei); 344 } else { 345 Slog.w(TAG, "This kernel does not have wired headset support"); 346 } 347 } 348 349 // Monitor USB 350 uei = new UEventInfo(NAME_USB_AUDIO, BIT_USB_HEADSET_ANLG, BIT_USB_HEADSET_DGTL); 351 if (uei.checkSwitchExists()) { 352 retVal.add(uei); 353 } else { 354 Slog.w(TAG, "This kernel does not have usb audio support"); 355 } 356 357 // Monitor HDMI 358 // 359 // If the kernel has support for the "hdmi_audio" switch, use that. It will be 360 // signalled only when the HDMI driver has a video mode configured, and the downstream 361 // sink indicates support for audio in its EDID. 362 // 363 // If the kernel does not have an "hdmi_audio" switch, just fall back on the older 364 // "hdmi" switch instead. 365 uei = new UEventInfo(NAME_HDMI_AUDIO, BIT_HDMI_AUDIO, 0); 366 if (uei.checkSwitchExists()) { 367 retVal.add(uei); 368 } else { 369 uei = new UEventInfo(NAME_HDMI, BIT_HDMI_AUDIO, 0); 370 if (uei.checkSwitchExists()) { 371 retVal.add(uei); 372 } else { 373 Slog.w(TAG, "This kernel does not have HDMI audio support"); 374 } 375 } 376 377 return retVal; 378 } 379 380 @Override 381 public void onUEvent(UEventObserver.UEvent event) { 382 if (LOG) Slog.v(TAG, "Headset UEVENT: " + event.toString()); 383 384 try { 385 String devPath = event.get("DEVPATH"); 386 String name = event.get("SWITCH_NAME"); 387 int state = Integer.parseInt(event.get("SWITCH_STATE")); 388 synchronized (mLock) { 389 updateStateLocked(devPath, name, state); 390 } 391 } catch (NumberFormatException e) { 392 Slog.e(TAG, "Could not parse switch state from event " + event); 393 } 394 } 395 396 private void updateStateLocked(String devPath, String name, int state) { 397 for (int i = 0; i < mUEventInfo.size(); ++i) { 398 UEventInfo uei = mUEventInfo.get(i); 399 if (devPath.equals(uei.getDevPath())) { 400 updateLocked(name, uei.computeNewHeadsetState(mHeadsetState, state)); 401 return; 402 } 403 } 404 } 405 406 private final class UEventInfo { 407 private final String mDevName; 408 private final int mState1Bits; 409 private final int mState2Bits; 410 411 public UEventInfo(String devName, int state1Bits, int state2Bits) { 412 mDevName = devName; 413 mState1Bits = state1Bits; 414 mState2Bits = state2Bits; 415 } 416 417 public String getDevName() { return mDevName; } 418 419 public String getDevPath() { 420 return String.format(Locale.US, "/devices/virtual/switch/%s", mDevName); 421 } 422 423 public String getSwitchStatePath() { 424 return String.format(Locale.US, "/sys/class/switch/%s/state", mDevName); 425 } 426 427 public boolean checkSwitchExists() { 428 File f = new File(getSwitchStatePath()); 429 return f.exists(); 430 } 431 432 public int computeNewHeadsetState(int headsetState, int switchState) { 433 int preserveMask = ~(mState1Bits | mState2Bits); 434 int setBits = ((switchState == 1) ? mState1Bits : 435 ((switchState == 2) ? mState2Bits : 0)); 436 437 return ((headsetState & preserveMask) | setBits); 438 } 439 } 440 } 441} 442