1 /* 2 * Copyright (C) 2005 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 #include <assert.h> 18 #include <dirent.h> 19 #include <errno.h> 20 #include <fcntl.h> 21 #include <inttypes.h> 22 #include <memory.h> 23 #include <stdint.h> 24 #include <stdio.h> 25 #include <stdlib.h> 26 #include <string.h> 27 #include <sys/epoll.h> 28 #include <sys/limits.h> 29 #include <sys/inotify.h> 30 #include <sys/ioctl.h> 31 #include <sys/utsname.h> 32 #include <unistd.h> 33 34 #define LOG_TAG "EventHub" 35 36 // #define LOG_NDEBUG 0 37 38 #include "EventHub.h" 39 40 #include <hardware_legacy/power.h> 41 42 #include <cutils/properties.h> 43 #include <openssl/sha.h> 44 #include <utils/Log.h> 45 #include <utils/Timers.h> 46 #include <utils/threads.h> 47 #include <utils/Errors.h> 48 49 #include <input/KeyLayoutMap.h> 50 #include <input/KeyCharacterMap.h> 51 #include <input/VirtualKeyMap.h> 52 53 /* this macro is used to tell if "bit" is set in "array" 54 * it selects a byte from the array, and does a boolean AND 55 * operation with a byte that only has the relevant bit set. 56 * eg. to check for the 12th bit, we do (array[1] & 1<<4) 57 */ 58 #define test_bit(bit, array) ((array)[(bit)/8] & (1<<((bit)%8))) 59 60 /* this macro computes the number of bytes needed to represent a bit array of the specified size */ 61 #define sizeof_bit_array(bits) (((bits) + 7) / 8) 62 63 #define INDENT " " 64 #define INDENT2 " " 65 #define INDENT3 " " 66 67 namespace android { 68 69 static const char *WAKE_LOCK_ID = "KeyEvents"; 70 static const char *DEVICE_PATH = "/dev/input"; 71 72 /* return the larger integer */ 73 static inline int max(int v1, int v2) 74 { 75 return (v1 > v2) ? v1 : v2; 76 } 77 78 static inline const char* toString(bool value) { 79 return value ? "true" : "false"; 80 } 81 82 static String8 sha1(const String8& in) { 83 SHA_CTX ctx; 84 SHA1_Init(&ctx); 85 SHA1_Update(&ctx, reinterpret_cast<const u_char*>(in.string()), in.size()); 86 u_char digest[SHA_DIGEST_LENGTH]; 87 SHA1_Final(digest, &ctx); 88 89 String8 out; 90 for (size_t i = 0; i < SHA_DIGEST_LENGTH; i++) { 91 out.appendFormat("%02x", digest[i]); 92 } 93 return out; 94 } 95 96 static void getLinuxRelease(int* major, int* minor) { 97 struct utsname info; 98 if (uname(&info) || sscanf(info.release, "%d.%d", major, minor) <= 0) { 99 *major = 0, *minor = 0; 100 ALOGE("Could not get linux version: %s", strerror(errno)); 101 } 102 } 103 104 // --- Global Functions --- 105 106 uint32_t getAbsAxisUsage(int32_t axis, uint32_t deviceClasses) { 107 // Touch devices get dibs on touch-related axes. 108 if (deviceClasses & INPUT_DEVICE_CLASS_TOUCH) { 109 switch (axis) { 110 case ABS_X: 111 case ABS_Y: 112 case ABS_PRESSURE: 113 case ABS_TOOL_WIDTH: 114 case ABS_DISTANCE: 115 case ABS_TILT_X: 116 case ABS_TILT_Y: 117 case ABS_MT_SLOT: 118 case ABS_MT_TOUCH_MAJOR: 119 case ABS_MT_TOUCH_MINOR: 120 case ABS_MT_WIDTH_MAJOR: 121 case ABS_MT_WIDTH_MINOR: 122 case ABS_MT_ORIENTATION: 123 case ABS_MT_POSITION_X: 124 case ABS_MT_POSITION_Y: 125 case ABS_MT_TOOL_TYPE: 126 case ABS_MT_BLOB_ID: 127 case ABS_MT_TRACKING_ID: 128 case ABS_MT_PRESSURE: 129 case ABS_MT_DISTANCE: 130 return INPUT_DEVICE_CLASS_TOUCH; 131 } 132 } 133 134 // External stylus gets the pressure axis 135 if (deviceClasses & INPUT_DEVICE_CLASS_EXTERNAL_STYLUS) { 136 if (axis == ABS_PRESSURE) { 137 return INPUT_DEVICE_CLASS_EXTERNAL_STYLUS; 138 } 139 } 140 141 // Joystick devices get the rest. 142 return deviceClasses & INPUT_DEVICE_CLASS_JOYSTICK; 143 } 144 145 // --- EventHub::Device --- 146 147 EventHub::Device::Device(int fd, int32_t id, const String8& path, 148 const InputDeviceIdentifier& identifier) : 149 next(NULL), 150 fd(fd), id(id), path(path), identifier(identifier), 151 classes(0), configuration(NULL), virtualKeyMap(NULL), 152 ffEffectPlaying(false), ffEffectId(-1), controllerNumber(0), 153 timestampOverrideSec(0), timestampOverrideUsec(0), enabled(true), 154 isVirtual(fd < 0) { 155 memset(keyBitmask, 0, sizeof(keyBitmask)); 156 memset(absBitmask, 0, sizeof(absBitmask)); 157 memset(relBitmask, 0, sizeof(relBitmask)); 158 memset(swBitmask, 0, sizeof(swBitmask)); 159 memset(ledBitmask, 0, sizeof(ledBitmask)); 160 memset(ffBitmask, 0, sizeof(ffBitmask)); 161 memset(propBitmask, 0, sizeof(propBitmask)); 162 } 163 164 EventHub::Device::~Device() { 165 close(); 166 delete configuration; 167 delete virtualKeyMap; 168 } 169 170 void EventHub::Device::close() { 171 if (fd >= 0) { 172 ::close(fd); 173 fd = -1; 174 } 175 } 176 177 status_t EventHub::Device::enable() { 178 fd = open(path, O_RDWR | O_CLOEXEC | O_NONBLOCK); 179 if(fd < 0) { 180 ALOGE("could not open %s, %s\n", path.string(), strerror(errno)); 181 return -errno; 182 } 183 enabled = true; 184 return OK; 185 } 186 187 status_t EventHub::Device::disable() { 188 close(); 189 enabled = false; 190 return OK; 191 } 192 193 bool EventHub::Device::hasValidFd() { 194 return !isVirtual && enabled; 195 } 196 197 // --- EventHub --- 198 199 const uint32_t EventHub::EPOLL_ID_INOTIFY; 200 const uint32_t EventHub::EPOLL_ID_WAKE; 201 const int EventHub::EPOLL_SIZE_HINT; 202 const int EventHub::EPOLL_MAX_EVENTS; 203 204 EventHub::EventHub(void) : 205 mBuiltInKeyboardId(NO_BUILT_IN_KEYBOARD), mNextDeviceId(1), mControllerNumbers(), 206 mOpeningDevices(0), mClosingDevices(0), 207 mNeedToSendFinishedDeviceScan(false), 208 mNeedToReopenDevices(false), mNeedToScanDevices(true), 209 mPendingEventCount(0), mPendingEventIndex(0), mPendingINotify(false) { 210 acquire_wake_lock(PARTIAL_WAKE_LOCK, WAKE_LOCK_ID); 211 212 mEpollFd = epoll_create(EPOLL_SIZE_HINT); 213 LOG_ALWAYS_FATAL_IF(mEpollFd < 0, "Could not create epoll instance. errno=%d", errno); 214 215 mINotifyFd = inotify_init(); 216 int result = inotify_add_watch(mINotifyFd, DEVICE_PATH, IN_DELETE | IN_CREATE); 217 LOG_ALWAYS_FATAL_IF(result < 0, "Could not register INotify for %s. errno=%d", 218 DEVICE_PATH, errno); 219 220 struct epoll_event eventItem; 221 memset(&eventItem, 0, sizeof(eventItem)); 222 eventItem.events = EPOLLIN; 223 eventItem.data.u32 = EPOLL_ID_INOTIFY; 224 result = epoll_ctl(mEpollFd, EPOLL_CTL_ADD, mINotifyFd, &eventItem); 225 LOG_ALWAYS_FATAL_IF(result != 0, "Could not add INotify to epoll instance. errno=%d", errno); 226 227 int wakeFds[2]; 228 result = pipe(wakeFds); 229 LOG_ALWAYS_FATAL_IF(result != 0, "Could not create wake pipe. errno=%d", errno); 230 231 mWakeReadPipeFd = wakeFds[0]; 232 mWakeWritePipeFd = wakeFds[1]; 233 234 result = fcntl(mWakeReadPipeFd, F_SETFL, O_NONBLOCK); 235 LOG_ALWAYS_FATAL_IF(result != 0, "Could not make wake read pipe non-blocking. errno=%d", 236 errno); 237 238 result = fcntl(mWakeWritePipeFd, F_SETFL, O_NONBLOCK); 239 LOG_ALWAYS_FATAL_IF(result != 0, "Could not make wake write pipe non-blocking. errno=%d", 240 errno); 241 242 eventItem.data.u32 = EPOLL_ID_WAKE; 243 result = epoll_ctl(mEpollFd, EPOLL_CTL_ADD, mWakeReadPipeFd, &eventItem); 244 LOG_ALWAYS_FATAL_IF(result != 0, "Could not add wake read pipe to epoll instance. errno=%d", 245 errno); 246 247 int major, minor; 248 getLinuxRelease(&major, &minor); 249 // EPOLLWAKEUP was introduced in kernel 3.5 250 mUsingEpollWakeup = major > 3 || (major == 3 && minor >= 5); 251 } 252 253 EventHub::~EventHub(void) { 254 closeAllDevicesLocked(); 255 256 while (mClosingDevices) { 257 Device* device = mClosingDevices; 258 mClosingDevices = device->next; 259 delete device; 260 } 261 262 ::close(mEpollFd); 263 ::close(mINotifyFd); 264 ::close(mWakeReadPipeFd); 265 ::close(mWakeWritePipeFd); 266 267 release_wake_lock(WAKE_LOCK_ID); 268 } 269 270 InputDeviceIdentifier EventHub::getDeviceIdentifier(int32_t deviceId) const { 271 AutoMutex _l(mLock); 272 Device* device = getDeviceLocked(deviceId); 273 if (device == NULL) return InputDeviceIdentifier(); 274 return device->identifier; 275 } 276 277 uint32_t EventHub::getDeviceClasses(int32_t deviceId) const { 278 AutoMutex _l(mLock); 279 Device* device = getDeviceLocked(deviceId); 280 if (device == NULL) return 0; 281 return device->classes; 282 } 283 284 int32_t EventHub::getDeviceControllerNumber(int32_t deviceId) const { 285 AutoMutex _l(mLock); 286 Device* device = getDeviceLocked(deviceId); 287 if (device == NULL) return 0; 288 return device->controllerNumber; 289 } 290 291 void EventHub::getConfiguration(int32_t deviceId, PropertyMap* outConfiguration) const { 292 AutoMutex _l(mLock); 293 Device* device = getDeviceLocked(deviceId); 294 if (device && device->configuration) { 295 *outConfiguration = *device->configuration; 296 } else { 297 outConfiguration->clear(); 298 } 299 } 300 301 status_t EventHub::getAbsoluteAxisInfo(int32_t deviceId, int axis, 302 RawAbsoluteAxisInfo* outAxisInfo) const { 303 outAxisInfo->clear(); 304 305 if (axis >= 0 && axis <= ABS_MAX) { 306 AutoMutex _l(mLock); 307 308 Device* device = getDeviceLocked(deviceId); 309 if (device && device->hasValidFd() && test_bit(axis, device->absBitmask)) { 310 struct input_absinfo info; 311 if(ioctl(device->fd, EVIOCGABS(axis), &info)) { 312 ALOGW("Error reading absolute controller %d for device %s fd %d, errno=%d", 313 axis, device->identifier.name.string(), device->fd, errno); 314 return -errno; 315 } 316 317 if (info.minimum != info.maximum) { 318 outAxisInfo->valid = true; 319 outAxisInfo->minValue = info.minimum; 320 outAxisInfo->maxValue = info.maximum; 321 outAxisInfo->flat = info.flat; 322 outAxisInfo->fuzz = info.fuzz; 323 outAxisInfo->resolution = info.resolution; 324 } 325 return OK; 326 } 327 } 328 return -1; 329 } 330 331 bool EventHub::hasRelativeAxis(int32_t deviceId, int axis) const { 332 if (axis >= 0 && axis <= REL_MAX) { 333 AutoMutex _l(mLock); 334 335 Device* device = getDeviceLocked(deviceId); 336 if (device) { 337 return test_bit(axis, device->relBitmask); 338 } 339 } 340 return false; 341 } 342 343 bool EventHub::hasInputProperty(int32_t deviceId, int property) const { 344 if (property >= 0 && property <= INPUT_PROP_MAX) { 345 AutoMutex _l(mLock); 346 347 Device* device = getDeviceLocked(deviceId); 348 if (device) { 349 return test_bit(property, device->propBitmask); 350 } 351 } 352 return false; 353 } 354 355 int32_t EventHub::getScanCodeState(int32_t deviceId, int32_t scanCode) const { 356 if (scanCode >= 0 && scanCode <= KEY_MAX) { 357 AutoMutex _l(mLock); 358 359 Device* device = getDeviceLocked(deviceId); 360 if (device && device->hasValidFd() && test_bit(scanCode, device->keyBitmask)) { 361 uint8_t keyState[sizeof_bit_array(KEY_MAX + 1)]; 362 memset(keyState, 0, sizeof(keyState)); 363 if (ioctl(device->fd, EVIOCGKEY(sizeof(keyState)), keyState) >= 0) { 364 return test_bit(scanCode, keyState) ? AKEY_STATE_DOWN : AKEY_STATE_UP; 365 } 366 } 367 } 368 return AKEY_STATE_UNKNOWN; 369 } 370 371 int32_t EventHub::getKeyCodeState(int32_t deviceId, int32_t keyCode) const { 372 AutoMutex _l(mLock); 373 374 Device* device = getDeviceLocked(deviceId); 375 if (device && device->hasValidFd() && device->keyMap.haveKeyLayout()) { 376 Vector<int32_t> scanCodes; 377 device->keyMap.keyLayoutMap->findScanCodesForKey(keyCode, &scanCodes); 378 if (scanCodes.size() != 0) { 379 uint8_t keyState[sizeof_bit_array(KEY_MAX + 1)]; 380 memset(keyState, 0, sizeof(keyState)); 381 if (ioctl(device->fd, EVIOCGKEY(sizeof(keyState)), keyState) >= 0) { 382 for (size_t i = 0; i < scanCodes.size(); i++) { 383 int32_t sc = scanCodes.itemAt(i); 384 if (sc >= 0 && sc <= KEY_MAX && test_bit(sc, keyState)) { 385 return AKEY_STATE_DOWN; 386 } 387 } 388 return AKEY_STATE_UP; 389 } 390 } 391 } 392 return AKEY_STATE_UNKNOWN; 393 } 394 395 int32_t EventHub::getSwitchState(int32_t deviceId, int32_t sw) const { 396 if (sw >= 0 && sw <= SW_MAX) { 397 AutoMutex _l(mLock); 398 399 Device* device = getDeviceLocked(deviceId); 400 if (device && device->hasValidFd() && test_bit(sw, device->swBitmask)) { 401 uint8_t swState[sizeof_bit_array(SW_MAX + 1)]; 402 memset(swState, 0, sizeof(swState)); 403 if (ioctl(device->fd, EVIOCGSW(sizeof(swState)), swState) >= 0) { 404 return test_bit(sw, swState) ? AKEY_STATE_DOWN : AKEY_STATE_UP; 405 } 406 } 407 } 408 return AKEY_STATE_UNKNOWN; 409 } 410 411 status_t EventHub::getAbsoluteAxisValue(int32_t deviceId, int32_t axis, int32_t* outValue) const { 412 *outValue = 0; 413 414 if (axis >= 0 && axis <= ABS_MAX) { 415 AutoMutex _l(mLock); 416 417 Device* device = getDeviceLocked(deviceId); 418 if (device && device->hasValidFd() && test_bit(axis, device->absBitmask)) { 419 struct input_absinfo info; 420 if(ioctl(device->fd, EVIOCGABS(axis), &info)) { 421 ALOGW("Error reading absolute controller %d for device %s fd %d, errno=%d", 422 axis, device->identifier.name.string(), device->fd, errno); 423 return -errno; 424 } 425 426 *outValue = info.value; 427 return OK; 428 } 429 } 430 return -1; 431 } 432 433 bool EventHub::markSupportedKeyCodes(int32_t deviceId, size_t numCodes, 434 const int32_t* keyCodes, uint8_t* outFlags) const { 435 AutoMutex _l(mLock); 436 437 Device* device = getDeviceLocked(deviceId); 438 if (device && device->keyMap.haveKeyLayout()) { 439 Vector<int32_t> scanCodes; 440 for (size_t codeIndex = 0; codeIndex < numCodes; codeIndex++) { 441 scanCodes.clear(); 442 443 status_t err = device->keyMap.keyLayoutMap->findScanCodesForKey( 444 keyCodes[codeIndex], &scanCodes); 445 if (! err) { 446 // check the possible scan codes identified by the layout map against the 447 // map of codes actually emitted by the driver 448 for (size_t sc = 0; sc < scanCodes.size(); sc++) { 449 if (test_bit(scanCodes[sc], device->keyBitmask)) { 450 outFlags[codeIndex] = 1; 451 break; 452 } 453 } 454 } 455 } 456 return true; 457 } 458 return false; 459 } 460 461 status_t EventHub::mapKey(int32_t deviceId, 462 int32_t scanCode, int32_t usageCode, int32_t metaState, 463 int32_t* outKeycode, int32_t* outMetaState, uint32_t* outFlags) const { 464 AutoMutex _l(mLock); 465 Device* device = getDeviceLocked(deviceId); 466 status_t status = NAME_NOT_FOUND; 467 468 if (device) { 469 // Check the key character map first. 470 sp<KeyCharacterMap> kcm = device->getKeyCharacterMap(); 471 if (kcm != NULL) { 472 if (!kcm->mapKey(scanCode, usageCode, outKeycode)) { 473 *outFlags = 0; 474 status = NO_ERROR; 475 } 476 } 477 478 // Check the key layout next. 479 if (status != NO_ERROR && device->keyMap.haveKeyLayout()) { 480 if (!device->keyMap.keyLayoutMap->mapKey( 481 scanCode, usageCode, outKeycode, outFlags)) { 482 status = NO_ERROR; 483 } 484 } 485 486 if (status == NO_ERROR) { 487 if (kcm != NULL) { 488 kcm->tryRemapKey(*outKeycode, metaState, outKeycode, outMetaState); 489 } else { 490 *outMetaState = metaState; 491 } 492 } 493 } 494 495 if (status != NO_ERROR) { 496 *outKeycode = 0; 497 *outFlags = 0; 498 *outMetaState = metaState; 499 } 500 501 return status; 502 } 503 504 status_t EventHub::mapAxis(int32_t deviceId, int32_t scanCode, AxisInfo* outAxisInfo) const { 505 AutoMutex _l(mLock); 506 Device* device = getDeviceLocked(deviceId); 507 508 if (device && device->keyMap.haveKeyLayout()) { 509 status_t err = device->keyMap.keyLayoutMap->mapAxis(scanCode, outAxisInfo); 510 if (err == NO_ERROR) { 511 return NO_ERROR; 512 } 513 } 514 515 return NAME_NOT_FOUND; 516 } 517 518 void EventHub::setExcludedDevices(const Vector<String8>& devices) { 519 AutoMutex _l(mLock); 520 521 mExcludedDevices = devices; 522 } 523 524 bool EventHub::hasScanCode(int32_t deviceId, int32_t scanCode) const { 525 AutoMutex _l(mLock); 526 Device* device = getDeviceLocked(deviceId); 527 if (device && scanCode >= 0 && scanCode <= KEY_MAX) { 528 if (test_bit(scanCode, device->keyBitmask)) { 529 return true; 530 } 531 } 532 return false; 533 } 534 535 bool EventHub::hasLed(int32_t deviceId, int32_t led) const { 536 AutoMutex _l(mLock); 537 Device* device = getDeviceLocked(deviceId); 538 int32_t sc; 539 if (device && mapLed(device, led, &sc) == NO_ERROR) { 540 if (test_bit(sc, device->ledBitmask)) { 541 return true; 542 } 543 } 544 return false; 545 } 546 547 void EventHub::setLedState(int32_t deviceId, int32_t led, bool on) { 548 AutoMutex _l(mLock); 549 Device* device = getDeviceLocked(deviceId); 550 setLedStateLocked(device, led, on); 551 } 552 553 void EventHub::setLedStateLocked(Device* device, int32_t led, bool on) { 554 int32_t sc; 555 if (device && device->hasValidFd() && mapLed(device, led, &sc) != NAME_NOT_FOUND) { 556 struct input_event ev; 557 ev.time.tv_sec = 0; 558 ev.time.tv_usec = 0; 559 ev.type = EV_LED; 560 ev.code = sc; 561 ev.value = on ? 1 : 0; 562 563 ssize_t nWrite; 564 do { 565 nWrite = write(device->fd, &ev, sizeof(struct input_event)); 566 } while (nWrite == -1 && errno == EINTR); 567 } 568 } 569 570 void EventHub::getVirtualKeyDefinitions(int32_t deviceId, 571 Vector<VirtualKeyDefinition>& outVirtualKeys) const { 572 outVirtualKeys.clear(); 573 574 AutoMutex _l(mLock); 575 Device* device = getDeviceLocked(deviceId); 576 if (device && device->virtualKeyMap) { 577 outVirtualKeys.appendVector(device->virtualKeyMap->getVirtualKeys()); 578 } 579 } 580 581 sp<KeyCharacterMap> EventHub::getKeyCharacterMap(int32_t deviceId) const { 582 AutoMutex _l(mLock); 583 Device* device = getDeviceLocked(deviceId); 584 if (device) { 585 return device->getKeyCharacterMap(); 586 } 587 return NULL; 588 } 589 590 bool EventHub::setKeyboardLayoutOverlay(int32_t deviceId, 591 const sp<KeyCharacterMap>& map) { 592 AutoMutex _l(mLock); 593 Device* device = getDeviceLocked(deviceId); 594 if (device) { 595 if (map != device->overlayKeyMap) { 596 device->overlayKeyMap = map; 597 device->combinedKeyMap = KeyCharacterMap::combine( 598 device->keyMap.keyCharacterMap, map); 599 return true; 600 } 601 } 602 return false; 603 } 604 605 static String8 generateDescriptor(InputDeviceIdentifier& identifier) { 606 String8 rawDescriptor; 607 rawDescriptor.appendFormat(":%04x:%04x:", identifier.vendor, 608 identifier.product); 609 // TODO add handling for USB devices to not uniqueify kbs that show up twice 610 if (!identifier.uniqueId.isEmpty()) { 611 rawDescriptor.append("uniqueId:"); 612 rawDescriptor.append(identifier.uniqueId); 613 } else if (identifier.nonce != 0) { 614 rawDescriptor.appendFormat("nonce:%04x", identifier.nonce); 615 } 616 617 if (identifier.vendor == 0 && identifier.product == 0) { 618 // If we don't know the vendor and product id, then the device is probably 619 // built-in so we need to rely on other information to uniquely identify 620 // the input device. Usually we try to avoid relying on the device name or 621 // location but for built-in input device, they are unlikely to ever change. 622 if (!identifier.name.isEmpty()) { 623 rawDescriptor.append("name:"); 624 rawDescriptor.append(identifier.name); 625 } else if (!identifier.location.isEmpty()) { 626 rawDescriptor.append("location:"); 627 rawDescriptor.append(identifier.location); 628 } 629 } 630 identifier.descriptor = sha1(rawDescriptor); 631 return rawDescriptor; 632 } 633 634 void EventHub::assignDescriptorLocked(InputDeviceIdentifier& identifier) { 635 // Compute a device descriptor that uniquely identifies the device. 636 // The descriptor is assumed to be a stable identifier. Its value should not 637 // change between reboots, reconnections, firmware updates or new releases 638 // of Android. In practice we sometimes get devices that cannot be uniquely 639 // identified. In this case we enforce uniqueness between connected devices. 640 // Ideally, we also want the descriptor to be short and relatively opaque. 641 642 identifier.nonce = 0; 643 String8 rawDescriptor = generateDescriptor(identifier); 644 if (identifier.uniqueId.isEmpty()) { 645 // If it didn't have a unique id check for conflicts and enforce 646 // uniqueness if necessary. 647 while(getDeviceByDescriptorLocked(identifier.descriptor) != NULL) { 648 identifier.nonce++; 649 rawDescriptor = generateDescriptor(identifier); 650 } 651 } 652 ALOGV("Created descriptor: raw=%s, cooked=%s", rawDescriptor.string(), 653 identifier.descriptor.string()); 654 } 655 656 void EventHub::vibrate(int32_t deviceId, nsecs_t duration) { 657 AutoMutex _l(mLock); 658 Device* device = getDeviceLocked(deviceId); 659 if (device && device->hasValidFd()) { 660 ff_effect effect; 661 memset(&effect, 0, sizeof(effect)); 662 effect.type = FF_RUMBLE; 663 effect.id = device->ffEffectId; 664 effect.u.rumble.strong_magnitude = 0xc000; 665 effect.u.rumble.weak_magnitude = 0xc000; 666 effect.replay.length = (duration + 999999LL) / 1000000LL; 667 effect.replay.delay = 0; 668 if (ioctl(device->fd, EVIOCSFF, &effect)) { 669 ALOGW("Could not upload force feedback effect to device %s due to error %d.", 670 device->identifier.name.string(), errno); 671 return; 672 } 673 device->ffEffectId = effect.id; 674 675 struct input_event ev; 676 ev.time.tv_sec = 0; 677 ev.time.tv_usec = 0; 678 ev.type = EV_FF; 679 ev.code = device->ffEffectId; 680 ev.value = 1; 681 if (write(device->fd, &ev, sizeof(ev)) != sizeof(ev)) { 682 ALOGW("Could not start force feedback effect on device %s due to error %d.", 683 device->identifier.name.string(), errno); 684 return; 685 } 686 device->ffEffectPlaying = true; 687 } 688 } 689 690 void EventHub::cancelVibrate(int32_t deviceId) { 691 AutoMutex _l(mLock); 692 Device* device = getDeviceLocked(deviceId); 693 if (device && device->hasValidFd()) { 694 if (device->ffEffectPlaying) { 695 device->ffEffectPlaying = false; 696 697 struct input_event ev; 698 ev.time.tv_sec = 0; 699 ev.time.tv_usec = 0; 700 ev.type = EV_FF; 701 ev.code = device->ffEffectId; 702 ev.value = 0; 703 if (write(device->fd, &ev, sizeof(ev)) != sizeof(ev)) { 704 ALOGW("Could not stop force feedback effect on device %s due to error %d.", 705 device->identifier.name.string(), errno); 706 return; 707 } 708 } 709 } 710 } 711 712 EventHub::Device* EventHub::getDeviceByDescriptorLocked(String8& descriptor) const { 713 size_t size = mDevices.size(); 714 for (size_t i = 0; i < size; i++) { 715 Device* device = mDevices.valueAt(i); 716 if (descriptor.compare(device->identifier.descriptor) == 0) { 717 return device; 718 } 719 } 720 return NULL; 721 } 722 723 EventHub::Device* EventHub::getDeviceLocked(int32_t deviceId) const { 724 if (deviceId == BUILT_IN_KEYBOARD_ID) { 725 deviceId = mBuiltInKeyboardId; 726 } 727 ssize_t index = mDevices.indexOfKey(deviceId); 728 return index >= 0 ? mDevices.valueAt(index) : NULL; 729 } 730 731 EventHub::Device* EventHub::getDeviceByPathLocked(const char* devicePath) const { 732 for (size_t i = 0; i < mDevices.size(); i++) { 733 Device* device = mDevices.valueAt(i); 734 if (device->path == devicePath) { 735 return device; 736 } 737 } 738 return NULL; 739 } 740 741 size_t EventHub::getEvents(int timeoutMillis, RawEvent* buffer, size_t bufferSize) { 742 ALOG_ASSERT(bufferSize >= 1); 743 744 AutoMutex _l(mLock); 745 746 struct input_event readBuffer[bufferSize]; 747 748 RawEvent* event = buffer; 749 size_t capacity = bufferSize; 750 bool awoken = false; 751 for (;;) { 752 nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC); 753 754 // Reopen input devices if needed. 755 if (mNeedToReopenDevices) { 756 mNeedToReopenDevices = false; 757 758 ALOGI("Reopening all input devices due to a configuration change."); 759 760 closeAllDevicesLocked(); 761 mNeedToScanDevices = true; 762 break; // return to the caller before we actually rescan 763 } 764 765 // Report any devices that had last been added/removed. 766 while (mClosingDevices) { 767 Device* device = mClosingDevices; 768 ALOGV("Reporting device closed: id=%d, name=%s\n", 769 device->id, device->path.string()); 770 mClosingDevices = device->next; 771 event->when = now; 772 event->deviceId = device->id == mBuiltInKeyboardId ? BUILT_IN_KEYBOARD_ID : device->id; 773 event->type = DEVICE_REMOVED; 774 event += 1; 775 delete device; 776 mNeedToSendFinishedDeviceScan = true; 777 if (--capacity == 0) { 778 break; 779 } 780 } 781 782 if (mNeedToScanDevices) { 783 mNeedToScanDevices = false; 784 scanDevicesLocked(); 785 mNeedToSendFinishedDeviceScan = true; 786 } 787 788 while (mOpeningDevices != NULL) { 789 Device* device = mOpeningDevices; 790 ALOGV("Reporting device opened: id=%d, name=%s\n", 791 device->id, device->path.string()); 792 mOpeningDevices = device->next; 793 event->when = now; 794 event->deviceId = device->id == mBuiltInKeyboardId ? 0 : device->id; 795 event->type = DEVICE_ADDED; 796 event += 1; 797 mNeedToSendFinishedDeviceScan = true; 798 if (--capacity == 0) { 799 break; 800 } 801 } 802 803 if (mNeedToSendFinishedDeviceScan) { 804 mNeedToSendFinishedDeviceScan = false; 805 event->when = now; 806 event->type = FINISHED_DEVICE_SCAN; 807 event += 1; 808 if (--capacity == 0) { 809 break; 810 } 811 } 812 813 // Grab the next input event. 814 bool deviceChanged = false; 815 while (mPendingEventIndex < mPendingEventCount) { 816 const struct epoll_event& eventItem = mPendingEventItems[mPendingEventIndex++]; 817 if (eventItem.data.u32 == EPOLL_ID_INOTIFY) { 818 if (eventItem.events & EPOLLIN) { 819 mPendingINotify = true; 820 } else { 821 ALOGW("Received unexpected epoll event 0x%08x for INotify.", eventItem.events); 822 } 823 continue; 824 } 825 826 if (eventItem.data.u32 == EPOLL_ID_WAKE) { 827 if (eventItem.events & EPOLLIN) { 828 ALOGV("awoken after wake()"); 829 awoken = true; 830 char buffer[16]; 831 ssize_t nRead; 832 do { 833 nRead = read(mWakeReadPipeFd, buffer, sizeof(buffer)); 834 } while ((nRead == -1 && errno == EINTR) || nRead == sizeof(buffer)); 835 } else { 836 ALOGW("Received unexpected epoll event 0x%08x for wake read pipe.", 837 eventItem.events); 838 } 839 continue; 840 } 841 842 ssize_t deviceIndex = mDevices.indexOfKey(eventItem.data.u32); 843 if (deviceIndex < 0) { 844 ALOGW("Received unexpected epoll event 0x%08x for unknown device id %d.", 845 eventItem.events, eventItem.data.u32); 846 continue; 847 } 848 849 Device* device = mDevices.valueAt(deviceIndex); 850 if (eventItem.events & EPOLLIN) { 851 int32_t readSize = read(device->fd, readBuffer, 852 sizeof(struct input_event) * capacity); 853 if (readSize == 0 || (readSize < 0 && errno == ENODEV)) { 854 // Device was removed before INotify noticed. 855 ALOGW("could not get event, removed? (fd: %d size: %" PRId32 856 " bufferSize: %zu capacity: %zu errno: %d)\n", 857 device->fd, readSize, bufferSize, capacity, errno); 858 deviceChanged = true; 859 closeDeviceLocked(device); 860 } else if (readSize < 0) { 861 if (errno != EAGAIN && errno != EINTR) { 862 ALOGW("could not get event (errno=%d)", errno); 863 } 864 } else if ((readSize % sizeof(struct input_event)) != 0) { 865 ALOGE("could not get event (wrong size: %d)", readSize); 866 } else { 867 int32_t deviceId = device->id == mBuiltInKeyboardId ? 0 : device->id; 868 869 size_t count = size_t(readSize) / sizeof(struct input_event); 870 for (size_t i = 0; i < count; i++) { 871 struct input_event& iev = readBuffer[i]; 872 ALOGV("%s got: time=%d.%06d, type=%d, code=%d, value=%d", 873 device->path.string(), 874 (int) iev.time.tv_sec, (int) iev.time.tv_usec, 875 iev.type, iev.code, iev.value); 876 877 // Some input devices may have a better concept of the time 878 // when an input event was actually generated than the kernel 879 // which simply timestamps all events on entry to evdev. 880 // This is a custom Android extension of the input protocol 881 // mainly intended for use with uinput based device drivers. 882 if (iev.type == EV_MSC) { 883 if (iev.code == MSC_ANDROID_TIME_SEC) { 884 device->timestampOverrideSec = iev.value; 885 continue; 886 } else if (iev.code == MSC_ANDROID_TIME_USEC) { 887 device->timestampOverrideUsec = iev.value; 888 continue; 889 } 890 } 891 if (device->timestampOverrideSec || device->timestampOverrideUsec) { 892 iev.time.tv_sec = device->timestampOverrideSec; 893 iev.time.tv_usec = device->timestampOverrideUsec; 894 if (iev.type == EV_SYN && iev.code == SYN_REPORT) { 895 device->timestampOverrideSec = 0; 896 device->timestampOverrideUsec = 0; 897 } 898 ALOGV("applied override time %d.%06d", 899 int(iev.time.tv_sec), int(iev.time.tv_usec)); 900 } 901 902 // Use the time specified in the event instead of the current time 903 // so that downstream code can get more accurate estimates of 904 // event dispatch latency from the time the event is enqueued onto 905 // the evdev client buffer. 906 // 907 // The event's timestamp fortuitously uses the same monotonic clock 908 // time base as the rest of Android. The kernel event device driver 909 // (drivers/input/evdev.c) obtains timestamps using ktime_get_ts(). 910 // The systemTime(SYSTEM_TIME_MONOTONIC) function we use everywhere 911 // calls clock_gettime(CLOCK_MONOTONIC) which is implemented as a 912 // system call that also queries ktime_get_ts(). 913 event->when = nsecs_t(iev.time.tv_sec) * 1000000000LL 914 + nsecs_t(iev.time.tv_usec) * 1000LL; 915 ALOGV("event time %" PRId64 ", now %" PRId64, event->when, now); 916 917 // Bug 7291243: Add a guard in case the kernel generates timestamps 918 // that appear to be far into the future because they were generated 919 // using the wrong clock source. 920 // 921 // This can happen because when the input device is initially opened 922 // it has a default clock source of CLOCK_REALTIME. Any input events 923 // enqueued right after the device is opened will have timestamps 924 // generated using CLOCK_REALTIME. We later set the clock source 925 // to CLOCK_MONOTONIC but it is already too late. 926 // 927 // Invalid input event timestamps can result in ANRs, crashes and 928 // and other issues that are hard to track down. We must not let them 929 // propagate through the system. 930 // 931 // Log a warning so that we notice the problem and recover gracefully. 932 if (event->when >= now + 10 * 1000000000LL) { 933 // Double-check. Time may have moved on. 934 nsecs_t time = systemTime(SYSTEM_TIME_MONOTONIC); 935 if (event->when > time) { 936 ALOGW("An input event from %s has a timestamp that appears to " 937 "have been generated using the wrong clock source " 938 "(expected CLOCK_MONOTONIC): " 939 "event time %" PRId64 ", current time %" PRId64 940 ", call time %" PRId64 ". " 941 "Using current time instead.", 942 device->path.string(), event->when, time, now); 943 event->when = time; 944 } else { 945 ALOGV("Event time is ok but failed the fast path and required " 946 "an extra call to systemTime: " 947 "event time %" PRId64 ", current time %" PRId64 948 ", call time %" PRId64 ".", 949 event->when, time, now); 950 } 951 } 952 event->deviceId = deviceId; 953 event->type = iev.type; 954 event->code = iev.code; 955 event->value = iev.value; 956 event += 1; 957 capacity -= 1; 958 } 959 if (capacity == 0) { 960 // The result buffer is full. Reset the pending event index 961 // so we will try to read the device again on the next iteration. 962 mPendingEventIndex -= 1; 963 break; 964 } 965 } 966 } else if (eventItem.events & EPOLLHUP) { 967 ALOGI("Removing device %s due to epoll hang-up event.", 968 device->identifier.name.string()); 969 deviceChanged = true; 970 closeDeviceLocked(device); 971 } else { 972 ALOGW("Received unexpected epoll event 0x%08x for device %s.", 973 eventItem.events, device->identifier.name.string()); 974 } 975 } 976 977 // readNotify() will modify the list of devices so this must be done after 978 // processing all other events to ensure that we read all remaining events 979 // before closing the devices. 980 if (mPendingINotify && mPendingEventIndex >= mPendingEventCount) { 981 mPendingINotify = false; 982 readNotifyLocked(); 983 deviceChanged = true; 984 } 985 986 // Report added or removed devices immediately. 987 if (deviceChanged) { 988 continue; 989 } 990 991 // Return now if we have collected any events or if we were explicitly awoken. 992 if (event != buffer || awoken) { 993 break; 994 } 995 996 // Poll for events. Mind the wake lock dance! 997 // We hold a wake lock at all times except during epoll_wait(). This works due to some 998 // subtle choreography. When a device driver has pending (unread) events, it acquires 999 // a kernel wake lock. However, once the last pending event has been read, the device 1000 // driver will release the kernel wake lock. To prevent the system from going to sleep 1001 // when this happens, the EventHub holds onto its own user wake lock while the client 1002 // is processing events. Thus the system can only sleep if there are no events 1003 // pending or currently being processed. 1004 // 1005 // The timeout is advisory only. If the device is asleep, it will not wake just to 1006 // service the timeout. 1007 mPendingEventIndex = 0; 1008 1009 mLock.unlock(); // release lock before poll, must be before release_wake_lock 1010 release_wake_lock(WAKE_LOCK_ID); 1011 1012 int pollResult = epoll_wait(mEpollFd, mPendingEventItems, EPOLL_MAX_EVENTS, timeoutMillis); 1013 1014 acquire_wake_lock(PARTIAL_WAKE_LOCK, WAKE_LOCK_ID); 1015 mLock.lock(); // reacquire lock after poll, must be after acquire_wake_lock 1016 1017 if (pollResult == 0) { 1018 // Timed out. 1019 mPendingEventCount = 0; 1020 break; 1021 } 1022 1023 if (pollResult < 0) { 1024 // An error occurred. 1025 mPendingEventCount = 0; 1026 1027 // Sleep after errors to avoid locking up the system. 1028 // Hopefully the error is transient. 1029 if (errno != EINTR) { 1030 ALOGW("poll failed (errno=%d)\n", errno); 1031 usleep(100000); 1032 } 1033 } else { 1034 // Some events occurred. 1035 mPendingEventCount = size_t(pollResult); 1036 } 1037 } 1038 1039 // All done, return the number of events we read. 1040 return event - buffer; 1041 } 1042 1043 void EventHub::wake() { 1044 ALOGV("wake() called"); 1045 1046 ssize_t nWrite; 1047 do { 1048 nWrite = write(mWakeWritePipeFd, "W", 1); 1049 } while (nWrite == -1 && errno == EINTR); 1050 1051 if (nWrite != 1 && errno != EAGAIN) { 1052 ALOGW("Could not write wake signal, errno=%d", errno); 1053 } 1054 } 1055 1056 void EventHub::scanDevicesLocked() { 1057 status_t res = scanDirLocked(DEVICE_PATH); 1058 if(res < 0) { 1059 ALOGE("scan dir failed for %s\n", DEVICE_PATH); 1060 } 1061 if (mDevices.indexOfKey(VIRTUAL_KEYBOARD_ID) < 0) { 1062 createVirtualKeyboardLocked(); 1063 } 1064 } 1065 1066 // ---------------------------------------------------------------------------- 1067 1068 static bool containsNonZeroByte(const uint8_t* array, uint32_t startIndex, uint32_t endIndex) { 1069 const uint8_t* end = array + endIndex; 1070 array += startIndex; 1071 while (array != end) { 1072 if (*(array++) != 0) { 1073 return true; 1074 } 1075 } 1076 return false; 1077 } 1078 1079 static const int32_t GAMEPAD_KEYCODES[] = { 1080 AKEYCODE_BUTTON_A, AKEYCODE_BUTTON_B, AKEYCODE_BUTTON_C, 1081 AKEYCODE_BUTTON_X, AKEYCODE_BUTTON_Y, AKEYCODE_BUTTON_Z, 1082 AKEYCODE_BUTTON_L1, AKEYCODE_BUTTON_R1, 1083 AKEYCODE_BUTTON_L2, AKEYCODE_BUTTON_R2, 1084 AKEYCODE_BUTTON_THUMBL, AKEYCODE_BUTTON_THUMBR, 1085 AKEYCODE_BUTTON_START, AKEYCODE_BUTTON_SELECT, AKEYCODE_BUTTON_MODE, 1086 }; 1087 1088 status_t EventHub::registerDeviceForEpollLocked(Device* device) { 1089 struct epoll_event eventItem; 1090 memset(&eventItem, 0, sizeof(eventItem)); 1091 eventItem.events = EPOLLIN; 1092 if (mUsingEpollWakeup) { 1093 eventItem.events |= EPOLLWAKEUP; 1094 } 1095 eventItem.data.u32 = device->id; 1096 if (epoll_ctl(mEpollFd, EPOLL_CTL_ADD, device->fd, &eventItem)) { 1097 ALOGE("Could not add device fd to epoll instance. errno=%d", errno); 1098 return -errno; 1099 } 1100 return OK; 1101 } 1102 1103 status_t EventHub::unregisterDeviceFromEpollLocked(Device* device) { 1104 if (device->hasValidFd()) { 1105 if (epoll_ctl(mEpollFd, EPOLL_CTL_DEL, device->fd, NULL)) { 1106 ALOGW("Could not remove device fd from epoll instance. errno=%d", errno); 1107 return -errno; 1108 } 1109 } 1110 return OK; 1111 } 1112 1113 status_t EventHub::openDeviceLocked(const char *devicePath) { 1114 char buffer[80]; 1115 1116 ALOGV("Opening device: %s", devicePath); 1117 1118 int fd = open(devicePath, O_RDWR | O_CLOEXEC | O_NONBLOCK); 1119 if(fd < 0) { 1120 ALOGE("could not open %s, %s\n", devicePath, strerror(errno)); 1121 return -1; 1122 } 1123 1124 InputDeviceIdentifier identifier; 1125 1126 // Get device name. 1127 if(ioctl(fd, EVIOCGNAME(sizeof(buffer) - 1), &buffer) < 1) { 1128 //fprintf(stderr, "could not get device name for %s, %s\n", devicePath, strerror(errno)); 1129 } else { 1130 buffer[sizeof(buffer) - 1] = '\0'; 1131 identifier.name.setTo(buffer); 1132 } 1133 1134 // Check to see if the device is on our excluded list 1135 for (size_t i = 0; i < mExcludedDevices.size(); i++) { 1136 const String8& item = mExcludedDevices.itemAt(i); 1137 if (identifier.name == item) { 1138 ALOGI("ignoring event id %s driver %s\n", devicePath, item.string()); 1139 close(fd); 1140 return -1; 1141 } 1142 } 1143 1144 // Get device driver version. 1145 int driverVersion; 1146 if(ioctl(fd, EVIOCGVERSION, &driverVersion)) { 1147 ALOGE("could not get driver version for %s, %s\n", devicePath, strerror(errno)); 1148 close(fd); 1149 return -1; 1150 } 1151 1152 // Get device identifier. 1153 struct input_id inputId; 1154 if(ioctl(fd, EVIOCGID, &inputId)) { 1155 ALOGE("could not get device input id for %s, %s\n", devicePath, strerror(errno)); 1156 close(fd); 1157 return -1; 1158 } 1159 identifier.bus = inputId.bustype; 1160 identifier.product = inputId.product; 1161 identifier.vendor = inputId.vendor; 1162 identifier.version = inputId.version; 1163 1164 // Get device physical location. 1165 if(ioctl(fd, EVIOCGPHYS(sizeof(buffer) - 1), &buffer) < 1) { 1166 //fprintf(stderr, "could not get location for %s, %s\n", devicePath, strerror(errno)); 1167 } else { 1168 buffer[sizeof(buffer) - 1] = '\0'; 1169 identifier.location.setTo(buffer); 1170 } 1171 1172 // Get device unique id. 1173 if(ioctl(fd, EVIOCGUNIQ(sizeof(buffer) - 1), &buffer) < 1) { 1174 //fprintf(stderr, "could not get idstring for %s, %s\n", devicePath, strerror(errno)); 1175 } else { 1176 buffer[sizeof(buffer) - 1] = '\0'; 1177 identifier.uniqueId.setTo(buffer); 1178 } 1179 1180 // Fill in the descriptor. 1181 assignDescriptorLocked(identifier); 1182 1183 // Allocate device. (The device object takes ownership of the fd at this point.) 1184 int32_t deviceId = mNextDeviceId++; 1185 Device* device = new Device(fd, deviceId, String8(devicePath), identifier); 1186 1187 ALOGV("add device %d: %s\n", deviceId, devicePath); 1188 ALOGV(" bus: %04x\n" 1189 " vendor %04x\n" 1190 " product %04x\n" 1191 " version %04x\n", 1192 identifier.bus, identifier.vendor, identifier.product, identifier.version); 1193 ALOGV(" name: \"%s\"\n", identifier.name.string()); 1194 ALOGV(" location: \"%s\"\n", identifier.location.string()); 1195 ALOGV(" unique id: \"%s\"\n", identifier.uniqueId.string()); 1196 ALOGV(" descriptor: \"%s\"\n", identifier.descriptor.string()); 1197 ALOGV(" driver: v%d.%d.%d\n", 1198 driverVersion >> 16, (driverVersion >> 8) & 0xff, driverVersion & 0xff); 1199 1200 // Load the configuration file for the device. 1201 loadConfigurationLocked(device); 1202 1203 // Figure out the kinds of events the device reports. 1204 ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(device->keyBitmask)), device->keyBitmask); 1205 ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(device->absBitmask)), device->absBitmask); 1206 ioctl(fd, EVIOCGBIT(EV_REL, sizeof(device->relBitmask)), device->relBitmask); 1207 ioctl(fd, EVIOCGBIT(EV_SW, sizeof(device->swBitmask)), device->swBitmask); 1208 ioctl(fd, EVIOCGBIT(EV_LED, sizeof(device->ledBitmask)), device->ledBitmask); 1209 ioctl(fd, EVIOCGBIT(EV_FF, sizeof(device->ffBitmask)), device->ffBitmask); 1210 ioctl(fd, EVIOCGPROP(sizeof(device->propBitmask)), device->propBitmask); 1211 1212 // See if this is a keyboard. Ignore everything in the button range except for 1213 // joystick and gamepad buttons which are handled like keyboards for the most part. 1214 bool haveKeyboardKeys = containsNonZeroByte(device->keyBitmask, 0, sizeof_bit_array(BTN_MISC)) 1215 || containsNonZeroByte(device->keyBitmask, sizeof_bit_array(KEY_OK), 1216 sizeof_bit_array(KEY_MAX + 1)); 1217 bool haveGamepadButtons = containsNonZeroByte(device->keyBitmask, sizeof_bit_array(BTN_MISC), 1218 sizeof_bit_array(BTN_MOUSE)) 1219 || containsNonZeroByte(device->keyBitmask, sizeof_bit_array(BTN_JOYSTICK), 1220 sizeof_bit_array(BTN_DIGI)); 1221 if (haveKeyboardKeys || haveGamepadButtons) { 1222 device->classes |= INPUT_DEVICE_CLASS_KEYBOARD; 1223 } 1224 1225 // See if this is a cursor device such as a trackball or mouse. 1226 if (test_bit(BTN_MOUSE, device->keyBitmask) 1227 && test_bit(REL_X, device->relBitmask) 1228 && test_bit(REL_Y, device->relBitmask)) { 1229 device->classes |= INPUT_DEVICE_CLASS_CURSOR; 1230 } 1231 1232 // See if this is a rotary encoder type device. 1233 String8 deviceType = String8(); 1234 if (device->configuration && 1235 device->configuration->tryGetProperty(String8("device.type"), deviceType)) { 1236 if (!deviceType.compare(String8("rotaryEncoder"))) { 1237 device->classes |= INPUT_DEVICE_CLASS_ROTARY_ENCODER; 1238 } 1239 } 1240 1241 // See if this is a touch pad. 1242 // Is this a new modern multi-touch driver? 1243 if (test_bit(ABS_MT_POSITION_X, device->absBitmask) 1244 && test_bit(ABS_MT_POSITION_Y, device->absBitmask)) { 1245 // Some joysticks such as the PS3 controller report axes that conflict 1246 // with the ABS_MT range. Try to confirm that the device really is 1247 // a touch screen. 1248 if (test_bit(BTN_TOUCH, device->keyBitmask) || !haveGamepadButtons) { 1249 device->classes |= INPUT_DEVICE_CLASS_TOUCH | INPUT_DEVICE_CLASS_TOUCH_MT; 1250 } 1251 // Is this an old style single-touch driver? 1252 } else if (test_bit(BTN_TOUCH, device->keyBitmask) 1253 && test_bit(ABS_X, device->absBitmask) 1254 && test_bit(ABS_Y, device->absBitmask)) { 1255 device->classes |= INPUT_DEVICE_CLASS_TOUCH; 1256 // Is this a BT stylus? 1257 } else if ((test_bit(ABS_PRESSURE, device->absBitmask) || 1258 test_bit(BTN_TOUCH, device->keyBitmask)) 1259 && !test_bit(ABS_X, device->absBitmask) 1260 && !test_bit(ABS_Y, device->absBitmask)) { 1261 device->classes |= INPUT_DEVICE_CLASS_EXTERNAL_STYLUS; 1262 // Keyboard will try to claim some of the buttons but we really want to reserve those so we 1263 // can fuse it with the touch screen data, so just take them back. Note this means an 1264 // external stylus cannot also be a keyboard device. 1265 device->classes &= ~INPUT_DEVICE_CLASS_KEYBOARD; 1266 } 1267 1268 // See if this device is a joystick. 1269 // Assumes that joysticks always have gamepad buttons in order to distinguish them 1270 // from other devices such as accelerometers that also have absolute axes. 1271 if (haveGamepadButtons) { 1272 uint32_t assumedClasses = device->classes | INPUT_DEVICE_CLASS_JOYSTICK; 1273 for (int i = 0; i <= ABS_MAX; i++) { 1274 if (test_bit(i, device->absBitmask) 1275 && (getAbsAxisUsage(i, assumedClasses) & INPUT_DEVICE_CLASS_JOYSTICK)) { 1276 device->classes = assumedClasses; 1277 break; 1278 } 1279 } 1280 } 1281 1282 // Check whether this device has switches. 1283 for (int i = 0; i <= SW_MAX; i++) { 1284 if (test_bit(i, device->swBitmask)) { 1285 device->classes |= INPUT_DEVICE_CLASS_SWITCH; 1286 break; 1287 } 1288 } 1289 1290 // Check whether this device supports the vibrator. 1291 if (test_bit(FF_RUMBLE, device->ffBitmask)) { 1292 device->classes |= INPUT_DEVICE_CLASS_VIBRATOR; 1293 } 1294 1295 // Configure virtual keys. 1296 if ((device->classes & INPUT_DEVICE_CLASS_TOUCH)) { 1297 // Load the virtual keys for the touch screen, if any. 1298 // We do this now so that we can make sure to load the keymap if necessary. 1299 status_t status = loadVirtualKeyMapLocked(device); 1300 if (!status) { 1301 device->classes |= INPUT_DEVICE_CLASS_KEYBOARD; 1302 } 1303 } 1304 1305 // Load the key map. 1306 // We need to do this for joysticks too because the key layout may specify axes. 1307 status_t keyMapStatus = NAME_NOT_FOUND; 1308 if (device->classes & (INPUT_DEVICE_CLASS_KEYBOARD | INPUT_DEVICE_CLASS_JOYSTICK)) { 1309 // Load the keymap for the device. 1310 keyMapStatus = loadKeyMapLocked(device); 1311 } 1312 1313 // Configure the keyboard, gamepad or virtual keyboard. 1314 if (device->classes & INPUT_DEVICE_CLASS_KEYBOARD) { 1315 // Register the keyboard as a built-in keyboard if it is eligible. 1316 if (!keyMapStatus 1317 && mBuiltInKeyboardId == NO_BUILT_IN_KEYBOARD 1318 && isEligibleBuiltInKeyboard(device->identifier, 1319 device->configuration, &device->keyMap)) { 1320 mBuiltInKeyboardId = device->id; 1321 } 1322 1323 // 'Q' key support = cheap test of whether this is an alpha-capable kbd 1324 if (hasKeycodeLocked(device, AKEYCODE_Q)) { 1325 device->classes |= INPUT_DEVICE_CLASS_ALPHAKEY; 1326 } 1327 1328 // See if this device has a DPAD. 1329 if (hasKeycodeLocked(device, AKEYCODE_DPAD_UP) && 1330 hasKeycodeLocked(device, AKEYCODE_DPAD_DOWN) && 1331 hasKeycodeLocked(device, AKEYCODE_DPAD_LEFT) && 1332 hasKeycodeLocked(device, AKEYCODE_DPAD_RIGHT) && 1333 hasKeycodeLocked(device, AKEYCODE_DPAD_CENTER)) { 1334 device->classes |= INPUT_DEVICE_CLASS_DPAD; 1335 } 1336 1337 // See if this device has a gamepad. 1338 for (size_t i = 0; i < sizeof(GAMEPAD_KEYCODES)/sizeof(GAMEPAD_KEYCODES[0]); i++) { 1339 if (hasKeycodeLocked(device, GAMEPAD_KEYCODES[i])) { 1340 device->classes |= INPUT_DEVICE_CLASS_GAMEPAD; 1341 break; 1342 } 1343 } 1344 } 1345 1346 // If the device isn't recognized as something we handle, don't monitor it. 1347 if (device->classes == 0) { 1348 ALOGV("Dropping device: id=%d, path='%s', name='%s'", 1349 deviceId, devicePath, device->identifier.name.string()); 1350 delete device; 1351 return -1; 1352 } 1353 1354 // Determine whether the device has a mic. 1355 if (deviceHasMicLocked(device)) { 1356 device->classes |= INPUT_DEVICE_CLASS_MIC; 1357 } 1358 1359 // Determine whether the device is external or internal. 1360 if (isExternalDeviceLocked(device)) { 1361 device->classes |= INPUT_DEVICE_CLASS_EXTERNAL; 1362 } 1363 1364 if (device->classes & (INPUT_DEVICE_CLASS_JOYSTICK | INPUT_DEVICE_CLASS_DPAD) 1365 && device->classes & INPUT_DEVICE_CLASS_GAMEPAD) { 1366 device->controllerNumber = getNextControllerNumberLocked(device); 1367 setLedForControllerLocked(device); 1368 } 1369 1370 1371 if (registerDeviceForEpollLocked(device) != OK) { 1372 delete device; 1373 return -1; 1374 } 1375 1376 configureFd(device); 1377 1378 ALOGI("New device: id=%d, fd=%d, path='%s', name='%s', classes=0x%x, " 1379 "configuration='%s', keyLayout='%s', keyCharacterMap='%s', builtinKeyboard=%s, ", 1380 deviceId, fd, devicePath, device->identifier.name.string(), 1381 device->classes, 1382 device->configurationFile.string(), 1383 device->keyMap.keyLayoutFile.string(), 1384 device->keyMap.keyCharacterMapFile.string(), 1385 toString(mBuiltInKeyboardId == deviceId)); 1386 1387 addDeviceLocked(device); 1388 return OK; 1389 } 1390 1391 void EventHub::configureFd(Device* device) { 1392 // Set fd parameters with ioctl, such as key repeat, suspend block, and clock type 1393 if (device->classes & INPUT_DEVICE_CLASS_KEYBOARD) { 1394 // Disable kernel key repeat since we handle it ourselves 1395 unsigned int repeatRate[] = {0, 0}; 1396 if (ioctl(device->fd, EVIOCSREP, repeatRate)) { 1397 ALOGW("Unable to disable kernel key repeat for %s: %s", 1398 device->path.string(), strerror(errno)); 1399 } 1400 } 1401 1402 String8 wakeMechanism("EPOLLWAKEUP"); 1403 if (!mUsingEpollWakeup) { 1404 #ifndef EVIOCSSUSPENDBLOCK 1405 // uapi headers don't include EVIOCSSUSPENDBLOCK, and future kernels 1406 // will use an epoll flag instead, so as long as we want to support 1407 // this feature, we need to be prepared to define the ioctl ourselves. 1408 #define EVIOCSSUSPENDBLOCK _IOW('E', 0x91, int) 1409 #endif 1410 if (ioctl(device->fd, EVIOCSSUSPENDBLOCK, 1)) { 1411 wakeMechanism = "<none>"; 1412 } else { 1413 wakeMechanism = "EVIOCSSUSPENDBLOCK"; 1414 } 1415 } 1416 // Tell the kernel that we want to use the monotonic clock for reporting timestamps 1417 // associated with input events. This is important because the input system 1418 // uses the timestamps extensively and assumes they were recorded using the monotonic 1419 // clock. 1420 int clockId = CLOCK_MONOTONIC; 1421 bool usingClockIoctl = !ioctl(device->fd, EVIOCSCLOCKID, &clockId); 1422 ALOGI("wakeMechanism=%s, usingClockIoctl=%s", wakeMechanism.string(), 1423 toString(usingClockIoctl)); 1424 } 1425 1426 bool EventHub::isDeviceEnabled(int32_t deviceId) { 1427 AutoMutex _l(mLock); 1428 Device* device = getDeviceLocked(deviceId); 1429 if (device == NULL) { 1430 ALOGE("Invalid device id=%" PRId32 " provided to %s", deviceId, __func__); 1431 return false; 1432 } 1433 return device->enabled; 1434 } 1435 1436 status_t EventHub::enableDevice(int32_t deviceId) { 1437 AutoMutex _l(mLock); 1438 Device* device = getDeviceLocked(deviceId); 1439 if (device == NULL) { 1440 ALOGE("Invalid device id=%" PRId32 " provided to %s", deviceId, __func__); 1441 return BAD_VALUE; 1442 } 1443 if (device->enabled) { 1444 ALOGW("Duplicate call to %s, input device %" PRId32 " already enabled", __func__, deviceId); 1445 return OK; 1446 } 1447 status_t result = device->enable(); 1448 if (result != OK) { 1449 ALOGE("Failed to enable device %" PRId32, deviceId); 1450 return result; 1451 } 1452 1453 configureFd(device); 1454 1455 return registerDeviceForEpollLocked(device); 1456 } 1457 1458 status_t EventHub::disableDevice(int32_t deviceId) { 1459 AutoMutex _l(mLock); 1460 Device* device = getDeviceLocked(deviceId); 1461 if (device == NULL) { 1462 ALOGE("Invalid device id=%" PRId32 " provided to %s", deviceId, __func__); 1463 return BAD_VALUE; 1464 } 1465 if (!device->enabled) { 1466 ALOGW("Duplicate call to %s, input device already disabled", __func__); 1467 return OK; 1468 } 1469 unregisterDeviceFromEpollLocked(device); 1470 return device->disable(); 1471 } 1472 1473 void EventHub::createVirtualKeyboardLocked() { 1474 InputDeviceIdentifier identifier; 1475 identifier.name = "Virtual"; 1476 identifier.uniqueId = "<virtual>"; 1477 assignDescriptorLocked(identifier); 1478 1479 Device* device = new Device(-1, VIRTUAL_KEYBOARD_ID, String8("<virtual>"), identifier); 1480 device->classes = INPUT_DEVICE_CLASS_KEYBOARD 1481 | INPUT_DEVICE_CLASS_ALPHAKEY 1482 | INPUT_DEVICE_CLASS_DPAD 1483 | INPUT_DEVICE_CLASS_VIRTUAL; 1484 loadKeyMapLocked(device); 1485 addDeviceLocked(device); 1486 } 1487 1488 void EventHub::addDeviceLocked(Device* device) { 1489 mDevices.add(device->id, device); 1490 device->next = mOpeningDevices; 1491 mOpeningDevices = device; 1492 } 1493 1494 void EventHub::loadConfigurationLocked(Device* device) { 1495 device->configurationFile = getInputDeviceConfigurationFilePathByDeviceIdentifier( 1496 device->identifier, INPUT_DEVICE_CONFIGURATION_FILE_TYPE_CONFIGURATION); 1497 if (device->configurationFile.isEmpty()) { 1498 ALOGD("No input device configuration file found for device '%s'.", 1499 device->identifier.name.string()); 1500 } else { 1501 status_t status = PropertyMap::load(device->configurationFile, 1502 &device->configuration); 1503 if (status) { 1504 ALOGE("Error loading input device configuration file for device '%s'. " 1505 "Using default configuration.", 1506 device->identifier.name.string()); 1507 } 1508 } 1509 } 1510 1511 status_t EventHub::loadVirtualKeyMapLocked(Device* device) { 1512 // The virtual key map is supplied by the kernel as a system board property file. 1513 String8 path; 1514 path.append("/sys/board_properties/virtualkeys."); 1515 path.append(device->identifier.name); 1516 if (access(path.string(), R_OK)) { 1517 return NAME_NOT_FOUND; 1518 } 1519 return VirtualKeyMap::load(path, &device->virtualKeyMap); 1520 } 1521 1522 status_t EventHub::loadKeyMapLocked(Device* device) { 1523 return device->keyMap.load(device->identifier, device->configuration); 1524 } 1525 1526 bool EventHub::isExternalDeviceLocked(Device* device) { 1527 if (device->configuration) { 1528 bool value; 1529 if (device->configuration->tryGetProperty(String8("device.internal"), value)) { 1530 return !value; 1531 } 1532 } 1533 return device->identifier.bus == BUS_USB || device->identifier.bus == BUS_BLUETOOTH; 1534 } 1535 1536 bool EventHub::deviceHasMicLocked(Device* device) { 1537 if (device->configuration) { 1538 bool value; 1539 if (device->configuration->tryGetProperty(String8("audio.mic"), value)) { 1540 return value; 1541 } 1542 } 1543 return false; 1544 } 1545 1546 int32_t EventHub::getNextControllerNumberLocked(Device* device) { 1547 if (mControllerNumbers.isFull()) { 1548 ALOGI("Maximum number of controllers reached, assigning controller number 0 to device %s", 1549 device->identifier.name.string()); 1550 return 0; 1551 } 1552 // Since the controller number 0 is reserved for non-controllers, translate all numbers up by 1553 // one 1554 return static_cast<int32_t>(mControllerNumbers.markFirstUnmarkedBit() + 1); 1555 } 1556 1557 void EventHub::releaseControllerNumberLocked(Device* device) { 1558 int32_t num = device->controllerNumber; 1559 device->controllerNumber= 0; 1560 if (num == 0) { 1561 return; 1562 } 1563 mControllerNumbers.clearBit(static_cast<uint32_t>(num - 1)); 1564 } 1565 1566 void EventHub::setLedForControllerLocked(Device* device) { 1567 for (int i = 0; i < MAX_CONTROLLER_LEDS; i++) { 1568 setLedStateLocked(device, ALED_CONTROLLER_1 + i, device->controllerNumber == i + 1); 1569 } 1570 } 1571 1572 bool EventHub::hasKeycodeLocked(Device* device, int keycode) const { 1573 if (!device->keyMap.haveKeyLayout()) { 1574 return false; 1575 } 1576 1577 Vector<int32_t> scanCodes; 1578 device->keyMap.keyLayoutMap->findScanCodesForKey(keycode, &scanCodes); 1579 const size_t N = scanCodes.size(); 1580 for (size_t i=0; i<N && i<=KEY_MAX; i++) { 1581 int32_t sc = scanCodes.itemAt(i); 1582 if (sc >= 0 && sc <= KEY_MAX && test_bit(sc, device->keyBitmask)) { 1583 return true; 1584 } 1585 } 1586 1587 return false; 1588 } 1589 1590 status_t EventHub::mapLed(Device* device, int32_t led, int32_t* outScanCode) const { 1591 if (!device->keyMap.haveKeyLayout()) { 1592 return NAME_NOT_FOUND; 1593 } 1594 1595 int32_t scanCode; 1596 if(device->keyMap.keyLayoutMap->findScanCodeForLed(led, &scanCode) != NAME_NOT_FOUND) { 1597 if(scanCode >= 0 && scanCode <= LED_MAX && test_bit(scanCode, device->ledBitmask)) { 1598 *outScanCode = scanCode; 1599 return NO_ERROR; 1600 } 1601 } 1602 return NAME_NOT_FOUND; 1603 } 1604 1605 status_t EventHub::closeDeviceByPathLocked(const char *devicePath) { 1606 Device* device = getDeviceByPathLocked(devicePath); 1607 if (device) { 1608 closeDeviceLocked(device); 1609 return 0; 1610 } 1611 ALOGV("Remove device: %s not found, device may already have been removed.", devicePath); 1612 return -1; 1613 } 1614 1615 void EventHub::closeAllDevicesLocked() { 1616 while (mDevices.size() > 0) { 1617 closeDeviceLocked(mDevices.valueAt(mDevices.size() - 1)); 1618 } 1619 } 1620 1621 void EventHub::closeDeviceLocked(Device* device) { 1622 ALOGI("Removed device: path=%s name=%s id=%d fd=%d classes=0x%x\n", 1623 device->path.string(), device->identifier.name.string(), device->id, 1624 device->fd, device->classes); 1625 1626 if (device->id == mBuiltInKeyboardId) { 1627 ALOGW("built-in keyboard device %s (id=%d) is closing! the apps will not like this", 1628 device->path.string(), mBuiltInKeyboardId); 1629 mBuiltInKeyboardId = NO_BUILT_IN_KEYBOARD; 1630 } 1631 1632 unregisterDeviceFromEpollLocked(device); 1633 1634 releaseControllerNumberLocked(device); 1635 1636 mDevices.removeItem(device->id); 1637 device->close(); 1638 1639 // Unlink for opening devices list if it is present. 1640 Device* pred = NULL; 1641 bool found = false; 1642 for (Device* entry = mOpeningDevices; entry != NULL; ) { 1643 if (entry == device) { 1644 found = true; 1645 break; 1646 } 1647 pred = entry; 1648 entry = entry->next; 1649 } 1650 if (found) { 1651 // Unlink the device from the opening devices list then delete it. 1652 // We don't need to tell the client that the device was closed because 1653 // it does not even know it was opened in the first place. 1654 ALOGI("Device %s was immediately closed after opening.", device->path.string()); 1655 if (pred) { 1656 pred->next = device->next; 1657 } else { 1658 mOpeningDevices = device->next; 1659 } 1660 delete device; 1661 } else { 1662 // Link into closing devices list. 1663 // The device will be deleted later after we have informed the client. 1664 device->next = mClosingDevices; 1665 mClosingDevices = device; 1666 } 1667 } 1668 1669 status_t EventHub::readNotifyLocked() { 1670 int res; 1671 char devname[PATH_MAX]; 1672 char *filename; 1673 char event_buf[512]; 1674 int event_size; 1675 int event_pos = 0; 1676 struct inotify_event *event; 1677 1678 ALOGV("EventHub::readNotify nfd: %d\n", mINotifyFd); 1679 res = read(mINotifyFd, event_buf, sizeof(event_buf)); 1680 if(res < (int)sizeof(*event)) { 1681 if(errno == EINTR) 1682 return 0; 1683 ALOGW("could not get event, %s\n", strerror(errno)); 1684 return -1; 1685 } 1686 //printf("got %d bytes of event information\n", res); 1687 1688 strcpy(devname, DEVICE_PATH); 1689 filename = devname + strlen(devname); 1690 *filename++ = '/'; 1691 1692 while(res >= (int)sizeof(*event)) { 1693 event = (struct inotify_event *)(event_buf + event_pos); 1694 //printf("%d: %08x \"%s\"\n", event->wd, event->mask, event->len ? event->name : ""); 1695 if(event->len) { 1696 strcpy(filename, event->name); 1697 if(event->mask & IN_CREATE) { 1698 openDeviceLocked(devname); 1699 } else { 1700 ALOGI("Removing device '%s' due to inotify event\n", devname); 1701 closeDeviceByPathLocked(devname); 1702 } 1703 } 1704 event_size = sizeof(*event) + event->len; 1705 res -= event_size; 1706 event_pos += event_size; 1707 } 1708 return 0; 1709 } 1710 1711 status_t EventHub::scanDirLocked(const char *dirname) 1712 { 1713 char devname[PATH_MAX]; 1714 char *filename; 1715 DIR *dir; 1716 struct dirent *de; 1717 dir = opendir(dirname); 1718 if(dir == NULL) 1719 return -1; 1720 strcpy(devname, dirname); 1721 filename = devname + strlen(devname); 1722 *filename++ = '/'; 1723 while((de = readdir(dir))) { 1724 if(de->d_name[0] == '.' && 1725 (de->d_name[1] == '\0' || 1726 (de->d_name[1] == '.' && de->d_name[2] == '\0'))) 1727 continue; 1728 strcpy(filename, de->d_name); 1729 openDeviceLocked(devname); 1730 } 1731 closedir(dir); 1732 return 0; 1733 } 1734 1735 void EventHub::requestReopenDevices() { 1736 ALOGV("requestReopenDevices() called"); 1737 1738 AutoMutex _l(mLock); 1739 mNeedToReopenDevices = true; 1740 } 1741 1742 void EventHub::dump(String8& dump) { 1743 dump.append("Event Hub State:\n"); 1744 1745 { // acquire lock 1746 AutoMutex _l(mLock); 1747 1748 dump.appendFormat(INDENT "BuiltInKeyboardId: %d\n", mBuiltInKeyboardId); 1749 1750 dump.append(INDENT "Devices:\n"); 1751 1752 for (size_t i = 0; i < mDevices.size(); i++) { 1753 const Device* device = mDevices.valueAt(i); 1754 if (mBuiltInKeyboardId == device->id) { 1755 dump.appendFormat(INDENT2 "%d: %s (aka device 0 - built-in keyboard)\n", 1756 device->id, device->identifier.name.string()); 1757 } else { 1758 dump.appendFormat(INDENT2 "%d: %s\n", device->id, 1759 device->identifier.name.string()); 1760 } 1761 dump.appendFormat(INDENT3 "Classes: 0x%08x\n", device->classes); 1762 dump.appendFormat(INDENT3 "Path: %s\n", device->path.string()); 1763 dump.appendFormat(INDENT3 "Enabled: %s\n", toString(device->enabled)); 1764 dump.appendFormat(INDENT3 "Descriptor: %s\n", device->identifier.descriptor.string()); 1765 dump.appendFormat(INDENT3 "Location: %s\n", device->identifier.location.string()); 1766 dump.appendFormat(INDENT3 "ControllerNumber: %d\n", device->controllerNumber); 1767 dump.appendFormat(INDENT3 "UniqueId: %s\n", device->identifier.uniqueId.string()); 1768 dump.appendFormat(INDENT3 "Identifier: bus=0x%04x, vendor=0x%04x, " 1769 "product=0x%04x, version=0x%04x\n", 1770 device->identifier.bus, device->identifier.vendor, 1771 device->identifier.product, device->identifier.version); 1772 dump.appendFormat(INDENT3 "KeyLayoutFile: %s\n", 1773 device->keyMap.keyLayoutFile.string()); 1774 dump.appendFormat(INDENT3 "KeyCharacterMapFile: %s\n", 1775 device->keyMap.keyCharacterMapFile.string()); 1776 dump.appendFormat(INDENT3 "ConfigurationFile: %s\n", 1777 device->configurationFile.string()); 1778 dump.appendFormat(INDENT3 "HaveKeyboardLayoutOverlay: %s\n", 1779 toString(device->overlayKeyMap != NULL)); 1780 } 1781 } // release lock 1782 } 1783 1784 void EventHub::monitor() { 1785 // Acquire and release the lock to ensure that the event hub has not deadlocked. 1786 mLock.lock(); 1787 mLock.unlock(); 1788 } 1789 1790 1791 }; // namespace android 1792