EventHub.cpp revision 5ced76a14350db56f1a80f00076f8be3d982c389
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// 18// Handle events, like key input and vsync. 19// 20// The goal is to provide an optimized solution for Linux, not an 21// implementation that works well across all platforms. We expect 22// events to arrive on file descriptors, so that we can use a select() 23// select() call to sleep. 24// 25// We can't select() on anything but network sockets in Windows, so we 26// provide an alternative implementation of waitEvent for that platform. 27// 28#define LOG_TAG "EventHub" 29 30//#define LOG_NDEBUG 0 31 32#include "EventHub.h" 33 34#include <hardware_legacy/power.h> 35 36#include <cutils/properties.h> 37#include <utils/Log.h> 38#include <utils/Timers.h> 39#include <utils/threads.h> 40#include <utils/Errors.h> 41 42#include <stdlib.h> 43#include <stdio.h> 44#include <unistd.h> 45#include <fcntl.h> 46#include <memory.h> 47#include <errno.h> 48#include <assert.h> 49 50#include <ui/KeyLayoutMap.h> 51#include <ui/KeyCharacterMap.h> 52#include <ui/VirtualKeyMap.h> 53 54#include <string.h> 55#include <stdint.h> 56#include <dirent.h> 57#ifdef HAVE_INOTIFY 58# include <sys/inotify.h> 59#endif 60#ifdef HAVE_ANDROID_OS 61# include <sys/limits.h> /* not part of Linux */ 62#endif 63#include <sys/poll.h> 64#include <sys/ioctl.h> 65 66/* this macro is used to tell if "bit" is set in "array" 67 * it selects a byte from the array, and does a boolean AND 68 * operation with a byte that only has the relevant bit set. 69 * eg. to check for the 12th bit, we do (array[1] & 1<<4) 70 */ 71#define test_bit(bit, array) (array[bit/8] & (1<<(bit%8))) 72 73/* this macro computes the number of bytes needed to represent a bit array of the specified size */ 74#define sizeof_bit_array(bits) ((bits + 7) / 8) 75 76// Fd at index 0 is always reserved for inotify 77#define FIRST_ACTUAL_DEVICE_INDEX 1 78 79#define INDENT " " 80#define INDENT2 " " 81#define INDENT3 " " 82 83namespace android { 84 85static const char *WAKE_LOCK_ID = "KeyEvents"; 86static const char *DEVICE_PATH = "/dev/input"; 87 88/* return the larger integer */ 89static inline int max(int v1, int v2) 90{ 91 return (v1 > v2) ? v1 : v2; 92} 93 94static inline const char* toString(bool value) { 95 return value ? "true" : "false"; 96} 97 98// --- EventHub::Device --- 99 100EventHub::Device::Device(int fd, int32_t id, const String8& path, 101 const InputDeviceIdentifier& identifier) : 102 next(NULL), 103 fd(fd), id(id), path(path), identifier(identifier), 104 classes(0), keyBitmask(NULL), relBitmask(NULL), 105 configuration(NULL), virtualKeyMap(NULL) { 106} 107 108EventHub::Device::~Device() { 109 close(); 110 delete[] keyBitmask; 111 delete[] relBitmask; 112 delete configuration; 113 delete virtualKeyMap; 114} 115 116void EventHub::Device::close() { 117 if (fd >= 0) { 118 ::close(fd); 119 fd = -1; 120 } 121} 122 123 124// --- EventHub --- 125 126EventHub::EventHub(void) : 127 mError(NO_INIT), mBuiltInKeyboardId(-1), mNextDeviceId(1), 128 mOpeningDevices(0), mClosingDevices(0), 129 mOpened(false), mNeedToSendFinishedDeviceScan(false), 130 mInputFdIndex(1) { 131 acquire_wake_lock(PARTIAL_WAKE_LOCK, WAKE_LOCK_ID); 132 133 memset(mSwitches, 0, sizeof(mSwitches)); 134 mNumCpus = sysconf(_SC_NPROCESSORS_ONLN); 135} 136 137EventHub::~EventHub(void) { 138 release_wake_lock(WAKE_LOCK_ID); 139 // we should free stuff here... 140} 141 142status_t EventHub::errorCheck() const { 143 return mError; 144} 145 146String8 EventHub::getDeviceName(int32_t deviceId) const { 147 AutoMutex _l(mLock); 148 Device* device = getDeviceLocked(deviceId); 149 if (device == NULL) return String8(); 150 return device->identifier.name; 151} 152 153uint32_t EventHub::getDeviceClasses(int32_t deviceId) const { 154 AutoMutex _l(mLock); 155 Device* device = getDeviceLocked(deviceId); 156 if (device == NULL) return 0; 157 return device->classes; 158} 159 160void EventHub::getConfiguration(int32_t deviceId, PropertyMap* outConfiguration) const { 161 AutoMutex _l(mLock); 162 Device* device = getDeviceLocked(deviceId); 163 if (device && device->configuration) { 164 *outConfiguration = *device->configuration; 165 } else { 166 outConfiguration->clear(); 167 } 168} 169 170status_t EventHub::getAbsoluteAxisInfo(int32_t deviceId, int axis, 171 RawAbsoluteAxisInfo* outAxisInfo) const { 172 outAxisInfo->clear(); 173 174 AutoMutex _l(mLock); 175 Device* device = getDeviceLocked(deviceId); 176 if (device == NULL) return -1; 177 178 struct input_absinfo info; 179 180 if(ioctl(device->fd, EVIOCGABS(axis), &info)) { 181 LOGW("Error reading absolute controller %d for device %s fd %d\n", 182 axis, device->identifier.name.string(), device->fd); 183 return -errno; 184 } 185 186 if (info.minimum != info.maximum) { 187 outAxisInfo->valid = true; 188 outAxisInfo->minValue = info.minimum; 189 outAxisInfo->maxValue = info.maximum; 190 outAxisInfo->flat = info.flat; 191 outAxisInfo->fuzz = info.fuzz; 192 } 193 return OK; 194} 195 196bool EventHub::hasRelativeAxis(int32_t deviceId, int axis) const { 197 if (axis >= 0 && axis <= REL_MAX) { 198 AutoMutex _l(mLock); 199 200 Device* device = getDeviceLocked(deviceId); 201 if (device && device->relBitmask) { 202 return test_bit(axis, device->relBitmask); 203 } 204 } 205 return false; 206} 207 208int32_t EventHub::getScanCodeState(int32_t deviceId, int32_t scanCode) const { 209 if (scanCode >= 0 && scanCode <= KEY_MAX) { 210 AutoMutex _l(mLock); 211 212 Device* device = getDeviceLocked(deviceId); 213 if (device != NULL) { 214 return getScanCodeStateLocked(device, scanCode); 215 } 216 } 217 return AKEY_STATE_UNKNOWN; 218} 219 220int32_t EventHub::getScanCodeStateLocked(Device* device, int32_t scanCode) const { 221 uint8_t key_bitmask[sizeof_bit_array(KEY_MAX + 1)]; 222 memset(key_bitmask, 0, sizeof(key_bitmask)); 223 if (ioctl(device->fd, 224 EVIOCGKEY(sizeof(key_bitmask)), key_bitmask) >= 0) { 225 return test_bit(scanCode, key_bitmask) ? AKEY_STATE_DOWN : AKEY_STATE_UP; 226 } 227 return AKEY_STATE_UNKNOWN; 228} 229 230int32_t EventHub::getKeyCodeState(int32_t deviceId, int32_t keyCode) const { 231 AutoMutex _l(mLock); 232 233 Device* device = getDeviceLocked(deviceId); 234 if (device != NULL) { 235 return getKeyCodeStateLocked(device, keyCode); 236 } 237 return AKEY_STATE_UNKNOWN; 238} 239 240int32_t EventHub::getKeyCodeStateLocked(Device* device, int32_t keyCode) const { 241 if (!device->keyMap.haveKeyLayout()) { 242 return AKEY_STATE_UNKNOWN; 243 } 244 245 Vector<int32_t> scanCodes; 246 device->keyMap.keyLayoutMap->findScanCodesForKey(keyCode, &scanCodes); 247 248 uint8_t key_bitmask[sizeof_bit_array(KEY_MAX + 1)]; 249 memset(key_bitmask, 0, sizeof(key_bitmask)); 250 if (ioctl(device->fd, EVIOCGKEY(sizeof(key_bitmask)), key_bitmask) >= 0) { 251 #if 0 252 for (size_t i=0; i<=KEY_MAX; i++) { 253 LOGI("(Scan code %d: down=%d)", i, test_bit(i, key_bitmask)); 254 } 255 #endif 256 const size_t N = scanCodes.size(); 257 for (size_t i=0; i<N && i<=KEY_MAX; i++) { 258 int32_t sc = scanCodes.itemAt(i); 259 //LOGI("Code %d: down=%d", sc, test_bit(sc, key_bitmask)); 260 if (sc >= 0 && sc <= KEY_MAX && test_bit(sc, key_bitmask)) { 261 return AKEY_STATE_DOWN; 262 } 263 } 264 return AKEY_STATE_UP; 265 } 266 return AKEY_STATE_UNKNOWN; 267} 268 269int32_t EventHub::getSwitchState(int32_t deviceId, int32_t sw) const { 270 if (sw >= 0 && sw <= SW_MAX) { 271 AutoMutex _l(mLock); 272 273 Device* device = getDeviceLocked(deviceId); 274 if (device != NULL) { 275 return getSwitchStateLocked(device, sw); 276 } 277 } 278 return AKEY_STATE_UNKNOWN; 279} 280 281int32_t EventHub::getSwitchStateLocked(Device* device, int32_t sw) const { 282 uint8_t sw_bitmask[sizeof_bit_array(SW_MAX + 1)]; 283 memset(sw_bitmask, 0, sizeof(sw_bitmask)); 284 if (ioctl(device->fd, 285 EVIOCGSW(sizeof(sw_bitmask)), sw_bitmask) >= 0) { 286 return test_bit(sw, sw_bitmask) ? AKEY_STATE_DOWN : AKEY_STATE_UP; 287 } 288 return AKEY_STATE_UNKNOWN; 289} 290 291bool EventHub::markSupportedKeyCodes(int32_t deviceId, size_t numCodes, 292 const int32_t* keyCodes, uint8_t* outFlags) const { 293 AutoMutex _l(mLock); 294 295 Device* device = getDeviceLocked(deviceId); 296 if (device != NULL) { 297 return markSupportedKeyCodesLocked(device, numCodes, keyCodes, outFlags); 298 } 299 return false; 300} 301 302bool EventHub::markSupportedKeyCodesLocked(Device* device, size_t numCodes, 303 const int32_t* keyCodes, uint8_t* outFlags) const { 304 if (!device->keyMap.haveKeyLayout() || !device->keyBitmask) { 305 return false; 306 } 307 308 Vector<int32_t> scanCodes; 309 for (size_t codeIndex = 0; codeIndex < numCodes; codeIndex++) { 310 scanCodes.clear(); 311 312 status_t err = device->keyMap.keyLayoutMap->findScanCodesForKey( 313 keyCodes[codeIndex], &scanCodes); 314 if (! err) { 315 // check the possible scan codes identified by the layout map against the 316 // map of codes actually emitted by the driver 317 for (size_t sc = 0; sc < scanCodes.size(); sc++) { 318 if (test_bit(scanCodes[sc], device->keyBitmask)) { 319 outFlags[codeIndex] = 1; 320 break; 321 } 322 } 323 } 324 } 325 return true; 326} 327 328status_t EventHub::mapKey(int32_t deviceId, int scancode, 329 int32_t* outKeycode, uint32_t* outFlags) const 330{ 331 AutoMutex _l(mLock); 332 Device* device = getDeviceLocked(deviceId); 333 334 if (device && device->keyMap.haveKeyLayout()) { 335 status_t err = device->keyMap.keyLayoutMap->mapKey(scancode, outKeycode, outFlags); 336 if (err == NO_ERROR) { 337 return NO_ERROR; 338 } 339 } 340 341 if (mBuiltInKeyboardId != -1) { 342 device = getDeviceLocked(mBuiltInKeyboardId); 343 344 if (device && device->keyMap.haveKeyLayout()) { 345 status_t err = device->keyMap.keyLayoutMap->mapKey(scancode, outKeycode, outFlags); 346 if (err == NO_ERROR) { 347 return NO_ERROR; 348 } 349 } 350 } 351 352 *outKeycode = 0; 353 *outFlags = 0; 354 return NAME_NOT_FOUND; 355} 356 357status_t EventHub::mapAxis(int32_t deviceId, int scancode, AxisInfo* outAxisInfo) const 358{ 359 AutoMutex _l(mLock); 360 Device* device = getDeviceLocked(deviceId); 361 362 if (device && device->keyMap.haveKeyLayout()) { 363 status_t err = device->keyMap.keyLayoutMap->mapAxis(scancode, outAxisInfo); 364 if (err == NO_ERROR) { 365 return NO_ERROR; 366 } 367 } 368 369 if (mBuiltInKeyboardId != -1) { 370 device = getDeviceLocked(mBuiltInKeyboardId); 371 372 if (device && device->keyMap.haveKeyLayout()) { 373 status_t err = device->keyMap.keyLayoutMap->mapAxis(scancode, outAxisInfo); 374 if (err == NO_ERROR) { 375 return NO_ERROR; 376 } 377 } 378 } 379 380 return NAME_NOT_FOUND; 381} 382 383void EventHub::addExcludedDevice(const char* deviceName) 384{ 385 AutoMutex _l(mLock); 386 387 String8 name(deviceName); 388 mExcludedDevices.push_back(name); 389} 390 391bool EventHub::hasLed(int32_t deviceId, int32_t led) const { 392 AutoMutex _l(mLock); 393 Device* device = getDeviceLocked(deviceId); 394 if (device) { 395 uint8_t bitmask[sizeof_bit_array(LED_MAX + 1)]; 396 memset(bitmask, 0, sizeof(bitmask)); 397 if (ioctl(device->fd, EVIOCGBIT(EV_LED, sizeof(bitmask)), bitmask) >= 0) { 398 if (test_bit(led, bitmask)) { 399 return true; 400 } 401 } 402 } 403 return false; 404} 405 406void EventHub::setLedState(int32_t deviceId, int32_t led, bool on) { 407 AutoMutex _l(mLock); 408 Device* device = getDeviceLocked(deviceId); 409 if (device) { 410 struct input_event ev; 411 ev.time.tv_sec = 0; 412 ev.time.tv_usec = 0; 413 ev.type = EV_LED; 414 ev.code = led; 415 ev.value = on ? 1 : 0; 416 417 ssize_t nWrite; 418 do { 419 nWrite = write(device->fd, &ev, sizeof(struct input_event)); 420 } while (nWrite == -1 && errno == EINTR); 421 } 422} 423 424void EventHub::getVirtualKeyDefinitions(int32_t deviceId, 425 Vector<VirtualKeyDefinition>& outVirtualKeys) const { 426 outVirtualKeys.clear(); 427 428 AutoMutex _l(mLock); 429 Device* device = getDeviceLocked(deviceId); 430 if (device && device->virtualKeyMap) { 431 outVirtualKeys.appendVector(device->virtualKeyMap->getVirtualKeys()); 432 } 433} 434 435EventHub::Device* EventHub::getDeviceLocked(int32_t deviceId) const { 436 if (deviceId == 0) { 437 deviceId = mBuiltInKeyboardId; 438 } 439 440 size_t numDevices = mDevices.size(); 441 for (size_t i = FIRST_ACTUAL_DEVICE_INDEX; i < numDevices; i++) { 442 Device* device = mDevices[i]; 443 if (device->id == deviceId) { 444 return device; 445 } 446 } 447 return NULL; 448} 449 450size_t EventHub::getEvents(int timeoutMillis, RawEvent* buffer, size_t bufferSize) { 451 // Note that we only allow one caller to getEvents(), so don't need 452 // to do locking here... only when adding/removing devices. 453 assert(bufferSize >= 1); 454 455 if (!mOpened) { 456 mError = openPlatformInput() ? NO_ERROR : UNKNOWN_ERROR; 457 mOpened = true; 458 mNeedToSendFinishedDeviceScan = true; 459 } 460 461 struct input_event readBuffer[bufferSize]; 462 463 RawEvent* event = buffer; 464 size_t capacity = bufferSize; 465 for (;;) { 466 nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC); 467 468 // Report any devices that had last been added/removed. 469 while (mClosingDevices) { 470 Device* device = mClosingDevices; 471 LOGV("Reporting device closed: id=%d, name=%s\n", 472 device->id, device->path.string()); 473 mClosingDevices = device->next; 474 event->when = now; 475 event->deviceId = device->id == mBuiltInKeyboardId ? 0 : device->id; 476 event->type = DEVICE_REMOVED; 477 event += 1; 478 delete device; 479 mNeedToSendFinishedDeviceScan = true; 480 if (--capacity == 0) { 481 break; 482 } 483 } 484 485 while (mOpeningDevices != NULL) { 486 Device* device = mOpeningDevices; 487 LOGV("Reporting device opened: id=%d, name=%s\n", 488 device->id, device->path.string()); 489 mOpeningDevices = device->next; 490 event->when = now; 491 event->deviceId = device->id == mBuiltInKeyboardId ? 0 : device->id; 492 event->type = DEVICE_ADDED; 493 event += 1; 494 mNeedToSendFinishedDeviceScan = true; 495 if (--capacity == 0) { 496 break; 497 } 498 } 499 500 if (mNeedToSendFinishedDeviceScan) { 501 mNeedToSendFinishedDeviceScan = false; 502 event->when = now; 503 event->type = FINISHED_DEVICE_SCAN; 504 event += 1; 505 if (--capacity == 0) { 506 break; 507 } 508 } 509 510 // Grab the next input event. 511 // mInputFdIndex is initially 1 because index 0 is used for inotify. 512 bool deviceWasRemoved = false; 513 while (mInputFdIndex < mFds.size()) { 514 const struct pollfd& pfd = mFds[mInputFdIndex]; 515 if (pfd.revents & POLLIN) { 516 int32_t readSize = read(pfd.fd, readBuffer, sizeof(struct input_event) * capacity); 517 if (readSize < 0) { 518 if (errno == ENODEV) { 519 deviceWasRemoved = true; 520 break; 521 } 522 if (errno != EAGAIN && errno != EINTR) { 523 LOGW("could not get event (errno=%d)", errno); 524 } 525 } else if ((readSize % sizeof(struct input_event)) != 0) { 526 LOGE("could not get event (wrong size: %d)", readSize); 527 } else if (readSize == 0) { // eof 528 deviceWasRemoved = true; 529 break; 530 } else { 531 const Device* device = mDevices[mInputFdIndex]; 532 int32_t deviceId = device->id == mBuiltInKeyboardId ? 0 : device->id; 533 534 size_t count = size_t(readSize) / sizeof(struct input_event); 535 for (size_t i = 0; i < count; i++) { 536 const struct input_event& iev = readBuffer[i]; 537 LOGV("%s got: t0=%d, t1=%d, type=%d, code=%d, value=%d", 538 device->path.string(), 539 (int) iev.time.tv_sec, (int) iev.time.tv_usec, 540 iev.type, iev.code, iev.value); 541 542#ifdef HAVE_POSIX_CLOCKS 543 // Use the time specified in the event instead of the current time 544 // so that downstream code can get more accurate estimates of 545 // event dispatch latency from the time the event is enqueued onto 546 // the evdev client buffer. 547 // 548 // The event's timestamp fortuitously uses the same monotonic clock 549 // time base as the rest of Android. The kernel event device driver 550 // (drivers/input/evdev.c) obtains timestamps using ktime_get_ts(). 551 // The systemTime(SYSTEM_TIME_MONOTONIC) function we use everywhere 552 // calls clock_gettime(CLOCK_MONOTONIC) which is implemented as a 553 // system call that also queries ktime_get_ts(). 554 event->when = nsecs_t(iev.time.tv_sec) * 1000000000LL 555 + nsecs_t(iev.time.tv_usec) * 1000LL; 556 LOGV("event time %lld, now %lld", event->when, now); 557#else 558 event->when = now; 559#endif 560 event->deviceId = deviceId; 561 event->type = iev.type; 562 event->scanCode = iev.code; 563 event->value = iev.value; 564 event->keyCode = AKEYCODE_UNKNOWN; 565 event->flags = 0; 566 if (iev.type == EV_KEY && device->keyMap.haveKeyLayout()) { 567 status_t err = device->keyMap.keyLayoutMap->mapKey(iev.code, 568 &event->keyCode, &event->flags); 569 LOGV("iev.code=%d keyCode=%d flags=0x%08x err=%d\n", 570 iev.code, event->keyCode, event->flags, err); 571 } 572 event += 1; 573 } 574 capacity -= count; 575 if (capacity == 0) { 576 break; 577 } 578 } 579 } 580 mInputFdIndex += 1; 581 } 582 583 // Handle the case where a device has been removed but INotify has not yet noticed. 584 if (deviceWasRemoved) { 585 AutoMutex _l(mLock); 586 closeDeviceAtIndexLocked(mInputFdIndex); 587 continue; // report added or removed devices immediately 588 } 589 590#if HAVE_INOTIFY 591 // readNotify() will modify mFDs and mFDCount, so this must be done after 592 // processing all other events. 593 if(mFds[0].revents & POLLIN) { 594 readNotify(mFds[0].fd); 595 mFds.editItemAt(0).revents = 0; 596 mInputFdIndex = mFds.size(); 597 continue; // report added or removed devices immediately 598 } 599#endif 600 601 // Return now if we have collected any events, otherwise poll. 602 if (event != buffer) { 603 break; 604 } 605 606 // Poll for events. Mind the wake lock dance! 607 // We hold a wake lock at all times except during poll(). This works due to some 608 // subtle choreography. When a device driver has pending (unread) events, it acquires 609 // a kernel wake lock. However, once the last pending event has been read, the device 610 // driver will release the kernel wake lock. To prevent the system from going to sleep 611 // when this happens, the EventHub holds onto its own user wake lock while the client 612 // is processing events. Thus the system can only sleep if there are no events 613 // pending or currently being processed. 614 // 615 // The timeout is advisory only. If the device is asleep, it will not wake just to 616 // service the timeout. 617 release_wake_lock(WAKE_LOCK_ID); 618 619 int pollResult = poll(mFds.editArray(), mFds.size(), timeoutMillis); 620 621 acquire_wake_lock(PARTIAL_WAKE_LOCK, WAKE_LOCK_ID); 622 623 if (pollResult == 0) { 624 break; // timed out 625 } 626 if (pollResult < 0) { 627 // Sleep after errors to avoid locking up the system. 628 // Hopefully the error is transient. 629 if (errno != EINTR) { 630 LOGW("poll failed (errno=%d)\n", errno); 631 usleep(100000); 632 } 633 } else { 634 // On an SMP system, it is possible for the framework to read input events 635 // faster than the kernel input device driver can produce a complete packet. 636 // Because poll() wakes up as soon as the first input event becomes available, 637 // the framework will often end up reading one event at a time until the 638 // packet is complete. Instead of one call to read() returning 71 events, 639 // it could take 71 calls to read() each returning 1 event. 640 // 641 // Sleep for a short period of time after waking up from the poll() to give 642 // the kernel time to finish writing the entire packet of input events. 643 if (mNumCpus > 1) { 644 usleep(250); 645 } 646 } 647 648 // Prepare to process all of the FDs we just polled. 649 mInputFdIndex = 1; 650 } 651 652 // All done, return the number of events we read. 653 return event - buffer; 654} 655 656/* 657 * Open the platform-specific input device. 658 */ 659bool EventHub::openPlatformInput(void) { 660 /* 661 * Open platform-specific input device(s). 662 */ 663 int res, fd; 664 665#ifdef HAVE_INOTIFY 666 fd = inotify_init(); 667 res = inotify_add_watch(fd, DEVICE_PATH, IN_DELETE | IN_CREATE); 668 if(res < 0) { 669 LOGE("could not add watch for %s, %s\n", DEVICE_PATH, strerror(errno)); 670 } 671#else 672 /* 673 * The code in EventHub::getEvent assumes that mFDs[0] is an inotify fd. 674 * We allocate space for it and set it to something invalid. 675 */ 676 fd = -1; 677#endif 678 679 // Reserve fd index 0 for inotify. 680 struct pollfd pollfd; 681 pollfd.fd = fd; 682 pollfd.events = POLLIN; 683 pollfd.revents = 0; 684 mFds.push(pollfd); 685 mDevices.push(NULL); 686 687 res = scanDir(DEVICE_PATH); 688 if(res < 0) { 689 LOGE("scan dir failed for %s\n", DEVICE_PATH); 690 } 691 692 return true; 693} 694 695// ---------------------------------------------------------------------------- 696 697static bool containsNonZeroByte(const uint8_t* array, uint32_t startIndex, uint32_t endIndex) { 698 const uint8_t* end = array + endIndex; 699 array += startIndex; 700 while (array != end) { 701 if (*(array++) != 0) { 702 return true; 703 } 704 } 705 return false; 706} 707 708static const int32_t GAMEPAD_KEYCODES[] = { 709 AKEYCODE_BUTTON_A, AKEYCODE_BUTTON_B, AKEYCODE_BUTTON_C, 710 AKEYCODE_BUTTON_X, AKEYCODE_BUTTON_Y, AKEYCODE_BUTTON_Z, 711 AKEYCODE_BUTTON_L1, AKEYCODE_BUTTON_R1, 712 AKEYCODE_BUTTON_L2, AKEYCODE_BUTTON_R2, 713 AKEYCODE_BUTTON_THUMBL, AKEYCODE_BUTTON_THUMBR, 714 AKEYCODE_BUTTON_START, AKEYCODE_BUTTON_SELECT, AKEYCODE_BUTTON_MODE, 715 AKEYCODE_BUTTON_1, AKEYCODE_BUTTON_2, AKEYCODE_BUTTON_3, AKEYCODE_BUTTON_4, 716 AKEYCODE_BUTTON_5, AKEYCODE_BUTTON_6, AKEYCODE_BUTTON_7, AKEYCODE_BUTTON_8, 717 AKEYCODE_BUTTON_9, AKEYCODE_BUTTON_10, AKEYCODE_BUTTON_11, AKEYCODE_BUTTON_12, 718 AKEYCODE_BUTTON_13, AKEYCODE_BUTTON_14, AKEYCODE_BUTTON_15, AKEYCODE_BUTTON_16, 719}; 720 721int EventHub::openDevice(const char *devicePath) { 722 char buffer[80]; 723 724 LOGV("Opening device: %s", devicePath); 725 726 AutoMutex _l(mLock); 727 728 int fd = open(devicePath, O_RDWR); 729 if(fd < 0) { 730 LOGE("could not open %s, %s\n", devicePath, strerror(errno)); 731 return -1; 732 } 733 734 InputDeviceIdentifier identifier; 735 736 // Get device name. 737 if(ioctl(fd, EVIOCGNAME(sizeof(buffer) - 1), &buffer) < 1) { 738 //fprintf(stderr, "could not get device name for %s, %s\n", devicePath, strerror(errno)); 739 } else { 740 buffer[sizeof(buffer) - 1] = '\0'; 741 identifier.name.setTo(buffer); 742 } 743 744 // Check to see if the device is on our excluded list 745 List<String8>::iterator iter = mExcludedDevices.begin(); 746 List<String8>::iterator end = mExcludedDevices.end(); 747 for ( ; iter != end; iter++) { 748 const char* test = *iter; 749 if (identifier.name == test) { 750 LOGI("ignoring event id %s driver %s\n", devicePath, test); 751 close(fd); 752 return -1; 753 } 754 } 755 756 // Get device driver version. 757 int driverVersion; 758 if(ioctl(fd, EVIOCGVERSION, &driverVersion)) { 759 LOGE("could not get driver version for %s, %s\n", devicePath, strerror(errno)); 760 close(fd); 761 return -1; 762 } 763 764 // Get device identifier. 765 struct input_id inputId; 766 if(ioctl(fd, EVIOCGID, &inputId)) { 767 LOGE("could not get device input id for %s, %s\n", devicePath, strerror(errno)); 768 close(fd); 769 return -1; 770 } 771 identifier.bus = inputId.bustype; 772 identifier.product = inputId.product; 773 identifier.vendor = inputId.vendor; 774 identifier.version = inputId.version; 775 776 // Get device physical location. 777 if(ioctl(fd, EVIOCGPHYS(sizeof(buffer) - 1), &buffer) < 1) { 778 //fprintf(stderr, "could not get location for %s, %s\n", devicePath, strerror(errno)); 779 } else { 780 buffer[sizeof(buffer) - 1] = '\0'; 781 identifier.location.setTo(buffer); 782 } 783 784 // Get device unique id. 785 if(ioctl(fd, EVIOCGUNIQ(sizeof(buffer) - 1), &buffer) < 1) { 786 //fprintf(stderr, "could not get idstring for %s, %s\n", devicePath, strerror(errno)); 787 } else { 788 buffer[sizeof(buffer) - 1] = '\0'; 789 identifier.uniqueId.setTo(buffer); 790 } 791 792 // Make file descriptor non-blocking for use with poll(). 793 if (fcntl(fd, F_SETFL, O_NONBLOCK)) { 794 LOGE("Error %d making device file descriptor non-blocking.", errno); 795 close(fd); 796 return -1; 797 } 798 799 // Allocate device. (The device object takes ownership of the fd at this point.) 800 int32_t deviceId = mNextDeviceId++; 801 Device* device = new Device(fd, deviceId, String8(devicePath), identifier); 802 803#if 0 804 LOGI("add device %d: %s\n", deviceId, devicePath); 805 LOGI(" bus: %04x\n" 806 " vendor %04x\n" 807 " product %04x\n" 808 " version %04x\n", 809 identifier.bus, identifier.vendor, identifier.product, identifier.version); 810 LOGI(" name: \"%s\"\n", identifier.name.string()); 811 LOGI(" location: \"%s\"\n", identifier.location.string()); 812 LOGI(" unique id: \"%s\"\n", identifier.uniqueId.string()); 813 LOGI(" driver: v%d.%d.%d\n", 814 driverVersion >> 16, (driverVersion >> 8) & 0xff, driverVersion & 0xff); 815#endif 816 817 // Load the configuration file for the device. 818 loadConfiguration(device); 819 820 // Figure out the kinds of events the device reports. 821 uint8_t key_bitmask[sizeof_bit_array(KEY_MAX + 1)]; 822 memset(key_bitmask, 0, sizeof(key_bitmask)); 823 ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(key_bitmask)), key_bitmask); 824 825 uint8_t abs_bitmask[sizeof_bit_array(ABS_MAX + 1)]; 826 memset(abs_bitmask, 0, sizeof(abs_bitmask)); 827 ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(abs_bitmask)), abs_bitmask); 828 829 uint8_t rel_bitmask[sizeof_bit_array(REL_MAX + 1)]; 830 memset(rel_bitmask, 0, sizeof(rel_bitmask)); 831 ioctl(fd, EVIOCGBIT(EV_REL, sizeof(rel_bitmask)), rel_bitmask); 832 833 uint8_t sw_bitmask[sizeof_bit_array(SW_MAX + 1)]; 834 memset(sw_bitmask, 0, sizeof(sw_bitmask)); 835 ioctl(fd, EVIOCGBIT(EV_SW, sizeof(sw_bitmask)), sw_bitmask); 836 837 device->keyBitmask = new uint8_t[sizeof(key_bitmask)]; 838 if (device->keyBitmask != NULL) { 839 memcpy(device->keyBitmask, key_bitmask, sizeof(key_bitmask)); 840 } else { 841 delete device; 842 LOGE("out of memory allocating key bitmask"); 843 return -1; 844 } 845 846 device->relBitmask = new uint8_t[sizeof(rel_bitmask)]; 847 if (device->relBitmask != NULL) { 848 memcpy(device->relBitmask, rel_bitmask, sizeof(rel_bitmask)); 849 } else { 850 delete device; 851 LOGE("out of memory allocating rel bitmask"); 852 return -1; 853 } 854 855 // See if this is a keyboard. Ignore everything in the button range except for 856 // joystick and gamepad buttons which are handled like keyboards for the most part. 857 bool haveKeyboardKeys = containsNonZeroByte(key_bitmask, 0, sizeof_bit_array(BTN_MISC)) 858 || containsNonZeroByte(key_bitmask, sizeof_bit_array(KEY_OK), 859 sizeof_bit_array(KEY_MAX + 1)); 860 bool haveGamepadButtons = containsNonZeroByte(key_bitmask, sizeof_bit_array(BTN_MISC), 861 sizeof_bit_array(BTN_MOUSE)) 862 || containsNonZeroByte(key_bitmask, sizeof_bit_array(BTN_JOYSTICK), 863 sizeof_bit_array(BTN_DIGI)); 864 if (haveKeyboardKeys || haveGamepadButtons) { 865 device->classes |= INPUT_DEVICE_CLASS_KEYBOARD; 866 } 867 868 // See if this is a cursor device such as a trackball or mouse. 869 if (test_bit(BTN_MOUSE, key_bitmask) 870 && test_bit(REL_X, rel_bitmask) 871 && test_bit(REL_Y, rel_bitmask)) { 872 device->classes |= INPUT_DEVICE_CLASS_CURSOR; 873 } 874 875 // See if this is a touch pad. 876 // Is this a new modern multi-touch driver? 877 if (test_bit(ABS_MT_POSITION_X, abs_bitmask) 878 && test_bit(ABS_MT_POSITION_Y, abs_bitmask)) { 879 // Some joysticks such as the PS3 controller report axes that conflict 880 // with the ABS_MT range. Try to confirm that the device really is 881 // a touch screen. 882 if (test_bit(BTN_TOUCH, key_bitmask) || !haveGamepadButtons) { 883 device->classes |= INPUT_DEVICE_CLASS_TOUCH | INPUT_DEVICE_CLASS_TOUCH_MT; 884 } 885 // Is this an old style single-touch driver? 886 } else if (test_bit(BTN_TOUCH, key_bitmask) 887 && test_bit(ABS_X, abs_bitmask) 888 && test_bit(ABS_Y, abs_bitmask)) { 889 device->classes |= INPUT_DEVICE_CLASS_TOUCH; 890 } 891 892 // See if this device is a joystick. 893 // Ignore touchscreens because they use the same absolute axes for other purposes. 894 // Assumes that joysticks always have gamepad buttons in order to distinguish them 895 // from other devices such as accelerometers that also have absolute axes. 896 if (haveGamepadButtons 897 && !(device->classes & INPUT_DEVICE_CLASS_TOUCH) 898 && containsNonZeroByte(abs_bitmask, 0, sizeof_bit_array(ABS_MAX + 1))) { 899 device->classes |= INPUT_DEVICE_CLASS_JOYSTICK; 900 } 901 902 // figure out the switches this device reports 903 bool haveSwitches = false; 904 for (int i=0; i<EV_SW; i++) { 905 //LOGI("Device %d sw %d: has=%d", device->id, i, test_bit(i, sw_bitmask)); 906 if (test_bit(i, sw_bitmask)) { 907 haveSwitches = true; 908 if (mSwitches[i] == 0) { 909 mSwitches[i] = device->id; 910 } 911 } 912 } 913 if (haveSwitches) { 914 device->classes |= INPUT_DEVICE_CLASS_SWITCH; 915 } 916 917 if ((device->classes & INPUT_DEVICE_CLASS_TOUCH)) { 918 // Load the virtual keys for the touch screen, if any. 919 // We do this now so that we can make sure to load the keymap if necessary. 920 status_t status = loadVirtualKeyMap(device); 921 if (!status) { 922 device->classes |= INPUT_DEVICE_CLASS_KEYBOARD; 923 } 924 } 925 926 // Load the key map. 927 // We need to do this for joysticks too because the key layout may specify axes. 928 status_t keyMapStatus = NAME_NOT_FOUND; 929 if (device->classes & (INPUT_DEVICE_CLASS_KEYBOARD | INPUT_DEVICE_CLASS_JOYSTICK)) { 930 // Load the keymap for the device. 931 keyMapStatus = loadKeyMap(device); 932 } 933 934 // Configure the keyboard, gamepad or virtual keyboard. 935 if (device->classes & INPUT_DEVICE_CLASS_KEYBOARD) { 936 // Set system properties for the keyboard. 937 setKeyboardProperties(device, false); 938 939 // Register the keyboard as a built-in keyboard if it is eligible. 940 if (!keyMapStatus 941 && mBuiltInKeyboardId == -1 942 && isEligibleBuiltInKeyboard(device->identifier, 943 device->configuration, &device->keyMap)) { 944 mBuiltInKeyboardId = device->id; 945 setKeyboardProperties(device, true); 946 } 947 948 // 'Q' key support = cheap test of whether this is an alpha-capable kbd 949 if (hasKeycodeLocked(device, AKEYCODE_Q)) { 950 device->classes |= INPUT_DEVICE_CLASS_ALPHAKEY; 951 } 952 953 // See if this device has a DPAD. 954 if (hasKeycodeLocked(device, AKEYCODE_DPAD_UP) && 955 hasKeycodeLocked(device, AKEYCODE_DPAD_DOWN) && 956 hasKeycodeLocked(device, AKEYCODE_DPAD_LEFT) && 957 hasKeycodeLocked(device, AKEYCODE_DPAD_RIGHT) && 958 hasKeycodeLocked(device, AKEYCODE_DPAD_CENTER)) { 959 device->classes |= INPUT_DEVICE_CLASS_DPAD; 960 } 961 962 // See if this device has a gamepad. 963 for (size_t i = 0; i < sizeof(GAMEPAD_KEYCODES)/sizeof(GAMEPAD_KEYCODES[0]); i++) { 964 if (hasKeycodeLocked(device, GAMEPAD_KEYCODES[i])) { 965 device->classes |= INPUT_DEVICE_CLASS_GAMEPAD; 966 break; 967 } 968 } 969 } 970 971 // If the device isn't recognized as something we handle, don't monitor it. 972 if (device->classes == 0) { 973 LOGV("Dropping device: id=%d, path='%s', name='%s'", 974 deviceId, devicePath, device->identifier.name.string()); 975 delete device; 976 return -1; 977 } 978 979 // Determine whether the device is external or internal. 980 if (isExternalDevice(device)) { 981 device->classes |= INPUT_DEVICE_CLASS_EXTERNAL; 982 } 983 984 LOGI("New device: id=%d, fd=%d, path='%s', name='%s', classes=0x%x, " 985 "configuration='%s', keyLayout='%s', keyCharacterMap='%s', builtinKeyboard=%s", 986 deviceId, fd, devicePath, device->identifier.name.string(), 987 device->classes, 988 device->configurationFile.string(), 989 device->keyMap.keyLayoutFile.string(), 990 device->keyMap.keyCharacterMapFile.string(), 991 toString(mBuiltInKeyboardId == deviceId)); 992 993 struct pollfd pollfd; 994 pollfd.fd = fd; 995 pollfd.events = POLLIN; 996 pollfd.revents = 0; 997 mFds.push(pollfd); 998 mDevices.push(device); 999 1000 device->next = mOpeningDevices; 1001 mOpeningDevices = device; 1002 return 0; 1003} 1004 1005void EventHub::loadConfiguration(Device* device) { 1006 device->configurationFile = getInputDeviceConfigurationFilePathByDeviceIdentifier( 1007 device->identifier, INPUT_DEVICE_CONFIGURATION_FILE_TYPE_CONFIGURATION); 1008 if (device->configurationFile.isEmpty()) { 1009 LOGD("No input device configuration file found for device '%s'.", 1010 device->identifier.name.string()); 1011 } else { 1012 status_t status = PropertyMap::load(device->configurationFile, 1013 &device->configuration); 1014 if (status) { 1015 LOGE("Error loading input device configuration file for device '%s'. " 1016 "Using default configuration.", 1017 device->identifier.name.string()); 1018 } 1019 } 1020} 1021 1022status_t EventHub::loadVirtualKeyMap(Device* device) { 1023 // The virtual key map is supplied by the kernel as a system board property file. 1024 String8 path; 1025 path.append("/sys/board_properties/virtualkeys."); 1026 path.append(device->identifier.name); 1027 if (access(path.string(), R_OK)) { 1028 return NAME_NOT_FOUND; 1029 } 1030 return VirtualKeyMap::load(path, &device->virtualKeyMap); 1031} 1032 1033status_t EventHub::loadKeyMap(Device* device) { 1034 return device->keyMap.load(device->identifier, device->configuration); 1035} 1036 1037void EventHub::setKeyboardProperties(Device* device, bool builtInKeyboard) { 1038 int32_t id = builtInKeyboard ? 0 : device->id; 1039 android::setKeyboardProperties(id, device->identifier, 1040 device->keyMap.keyLayoutFile, device->keyMap.keyCharacterMapFile); 1041} 1042 1043void EventHub::clearKeyboardProperties(Device* device, bool builtInKeyboard) { 1044 int32_t id = builtInKeyboard ? 0 : device->id; 1045 android::clearKeyboardProperties(id); 1046} 1047 1048bool EventHub::isExternalDevice(Device* device) { 1049 if (device->configuration) { 1050 bool value; 1051 if (device->configuration->tryGetProperty(String8("device.internal"), value) 1052 && value) { 1053 return false; 1054 } 1055 } 1056 return device->identifier.bus == BUS_USB || device->identifier.bus == BUS_BLUETOOTH; 1057} 1058 1059bool EventHub::hasKeycodeLocked(Device* device, int keycode) const { 1060 if (!device->keyMap.haveKeyLayout() || !device->keyBitmask) { 1061 return false; 1062 } 1063 1064 Vector<int32_t> scanCodes; 1065 device->keyMap.keyLayoutMap->findScanCodesForKey(keycode, &scanCodes); 1066 const size_t N = scanCodes.size(); 1067 for (size_t i=0; i<N && i<=KEY_MAX; i++) { 1068 int32_t sc = scanCodes.itemAt(i); 1069 if (sc >= 0 && sc <= KEY_MAX && test_bit(sc, device->keyBitmask)) { 1070 return true; 1071 } 1072 } 1073 1074 return false; 1075} 1076 1077int EventHub::closeDevice(const char *devicePath) { 1078 AutoMutex _l(mLock); 1079 1080 for (size_t i = FIRST_ACTUAL_DEVICE_INDEX; i < mDevices.size(); i++) { 1081 Device* device = mDevices[i]; 1082 if (device->path == devicePath) { 1083 return closeDeviceAtIndexLocked(i); 1084 } 1085 } 1086 LOGV("Remove device: %s not found, device may already have been removed.", devicePath); 1087 return -1; 1088} 1089 1090int EventHub::closeDeviceAtIndexLocked(int index) { 1091 Device* device = mDevices[index]; 1092 LOGI("Removed device: path=%s name=%s id=%d fd=%d classes=0x%x\n", 1093 device->path.string(), device->identifier.name.string(), device->id, 1094 device->fd, device->classes); 1095 1096 for (int j=0; j<EV_SW; j++) { 1097 if (mSwitches[j] == device->id) { 1098 mSwitches[j] = 0; 1099 } 1100 } 1101 1102 if (device->id == mBuiltInKeyboardId) { 1103 LOGW("built-in keyboard device %s (id=%d) is closing! the apps will not like this", 1104 device->path.string(), mBuiltInKeyboardId); 1105 mBuiltInKeyboardId = -1; 1106 clearKeyboardProperties(device, true); 1107 } 1108 clearKeyboardProperties(device, false); 1109 1110 mFds.removeAt(index); 1111 mDevices.removeAt(index); 1112 device->close(); 1113 1114 // Unlink for opening devices list if it is present. 1115 Device* pred = NULL; 1116 bool found = false; 1117 for (Device* entry = mOpeningDevices; entry != NULL; ) { 1118 if (entry == device) { 1119 found = true; 1120 break; 1121 } 1122 pred = entry; 1123 entry = entry->next; 1124 } 1125 if (found) { 1126 // Unlink the device from the opening devices list then delete it. 1127 // We don't need to tell the client that the device was closed because 1128 // it does not even know it was opened in the first place. 1129 LOGI("Device %s was immediately closed after opening.", device->path.string()); 1130 if (pred) { 1131 pred->next = device->next; 1132 } else { 1133 mOpeningDevices = device->next; 1134 } 1135 delete device; 1136 } else { 1137 // Link into closing devices list. 1138 // The device will be deleted later after we have informed the client. 1139 device->next = mClosingDevices; 1140 mClosingDevices = device; 1141 } 1142 return 0; 1143} 1144 1145int EventHub::readNotify(int nfd) { 1146#ifdef HAVE_INOTIFY 1147 int res; 1148 char devname[PATH_MAX]; 1149 char *filename; 1150 char event_buf[512]; 1151 int event_size; 1152 int event_pos = 0; 1153 struct inotify_event *event; 1154 1155 LOGV("EventHub::readNotify nfd: %d\n", nfd); 1156 res = read(nfd, event_buf, sizeof(event_buf)); 1157 if(res < (int)sizeof(*event)) { 1158 if(errno == EINTR) 1159 return 0; 1160 LOGW("could not get event, %s\n", strerror(errno)); 1161 return 1; 1162 } 1163 //printf("got %d bytes of event information\n", res); 1164 1165 strcpy(devname, DEVICE_PATH); 1166 filename = devname + strlen(devname); 1167 *filename++ = '/'; 1168 1169 while(res >= (int)sizeof(*event)) { 1170 event = (struct inotify_event *)(event_buf + event_pos); 1171 //printf("%d: %08x \"%s\"\n", event->wd, event->mask, event->len ? event->name : ""); 1172 if(event->len) { 1173 strcpy(filename, event->name); 1174 if(event->mask & IN_CREATE) { 1175 openDevice(devname); 1176 } 1177 else { 1178 closeDevice(devname); 1179 } 1180 } 1181 event_size = sizeof(*event) + event->len; 1182 res -= event_size; 1183 event_pos += event_size; 1184 } 1185#endif 1186 return 0; 1187} 1188 1189int EventHub::scanDir(const char *dirname) 1190{ 1191 char devname[PATH_MAX]; 1192 char *filename; 1193 DIR *dir; 1194 struct dirent *de; 1195 dir = opendir(dirname); 1196 if(dir == NULL) 1197 return -1; 1198 strcpy(devname, dirname); 1199 filename = devname + strlen(devname); 1200 *filename++ = '/'; 1201 while((de = readdir(dir))) { 1202 if(de->d_name[0] == '.' && 1203 (de->d_name[1] == '\0' || 1204 (de->d_name[1] == '.' && de->d_name[2] == '\0'))) 1205 continue; 1206 strcpy(filename, de->d_name); 1207 openDevice(devname); 1208 } 1209 closedir(dir); 1210 return 0; 1211} 1212 1213void EventHub::dump(String8& dump) { 1214 dump.append("Event Hub State:\n"); 1215 1216 { // acquire lock 1217 AutoMutex _l(mLock); 1218 1219 dump.appendFormat(INDENT "BuiltInKeyboardId: %d\n", mBuiltInKeyboardId); 1220 1221 dump.append(INDENT "Devices:\n"); 1222 1223 for (size_t i = FIRST_ACTUAL_DEVICE_INDEX; i < mDevices.size(); i++) { 1224 const Device* device = mDevices[i]; 1225 if (device) { 1226 if (mBuiltInKeyboardId == device->id) { 1227 dump.appendFormat(INDENT2 "%d: %s (aka device 0 - built-in keyboard)\n", 1228 device->id, device->identifier.name.string()); 1229 } else { 1230 dump.appendFormat(INDENT2 "%d: %s\n", device->id, 1231 device->identifier.name.string()); 1232 } 1233 dump.appendFormat(INDENT3 "Classes: 0x%08x\n", device->classes); 1234 dump.appendFormat(INDENT3 "Path: %s\n", device->path.string()); 1235 dump.appendFormat(INDENT3 "Location: %s\n", device->identifier.location.string()); 1236 dump.appendFormat(INDENT3 "UniqueId: %s\n", device->identifier.uniqueId.string()); 1237 dump.appendFormat(INDENT3 "Identifier: bus=0x%04x, vendor=0x%04x, " 1238 "product=0x%04x, version=0x%04x\n", 1239 device->identifier.bus, device->identifier.vendor, 1240 device->identifier.product, device->identifier.version); 1241 dump.appendFormat(INDENT3 "KeyLayoutFile: %s\n", 1242 device->keyMap.keyLayoutFile.string()); 1243 dump.appendFormat(INDENT3 "KeyCharacterMapFile: %s\n", 1244 device->keyMap.keyCharacterMapFile.string()); 1245 dump.appendFormat(INDENT3 "ConfigurationFile: %s\n", 1246 device->configurationFile.string()); 1247 } 1248 } 1249 } // release lock 1250} 1251 1252}; // namespace android 1253