1 /* 2 * User level driver support for input subsystem 3 * 4 * Heavily based on evdev.c by Vojtech Pavlik 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org> 21 * 22 * Changes/Revisions: 23 * 0.4 01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>) 24 * - add UI_GET_SYSNAME ioctl 25 * 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>) 26 * - updated ff support for the changes in kernel interface 27 * - added MODULE_VERSION 28 * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>) 29 * - added force feedback support 30 * - added UI_SET_PHYS 31 * 0.1 20/06/2002 32 * - first public version 33 */ 34 #include <uapi/linux/uinput.h> 35 #include <linux/poll.h> 36 #include <linux/sched.h> 37 #include <linux/slab.h> 38 #include <linux/module.h> 39 #include <linux/init.h> 40 #include <linux/fs.h> 41 #include <linux/miscdevice.h> 42 #include <linux/input/mt.h> 43 #include "../input-compat.h" 44 45 #define UINPUT_NAME "uinput" 46 #define UINPUT_BUFFER_SIZE 16 47 #define UINPUT_NUM_REQUESTS 16 48 49 enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED }; 50 51 struct uinput_request { 52 unsigned int id; 53 unsigned int code; /* UI_FF_UPLOAD, UI_FF_ERASE */ 54 55 int retval; 56 struct completion done; 57 58 union { 59 unsigned int effect_id; 60 struct { 61 struct ff_effect *effect; 62 struct ff_effect *old; 63 } upload; 64 } u; 65 }; 66 67 struct uinput_device { 68 struct input_dev *dev; 69 struct mutex mutex; 70 enum uinput_state state; 71 wait_queue_head_t waitq; 72 unsigned char ready; 73 unsigned char head; 74 unsigned char tail; 75 struct input_event buff[UINPUT_BUFFER_SIZE]; 76 unsigned int ff_effects_max; 77 78 struct uinput_request *requests[UINPUT_NUM_REQUESTS]; 79 wait_queue_head_t requests_waitq; 80 spinlock_t requests_lock; 81 }; 82 83 static int uinput_dev_event(struct input_dev *dev, 84 unsigned int type, unsigned int code, int value) 85 { 86 struct uinput_device *udev = input_get_drvdata(dev); 87 struct timespec64 ts; 88 89 udev->buff[udev->head].type = type; 90 udev->buff[udev->head].code = code; 91 udev->buff[udev->head].value = value; 92 ktime_get_ts64(&ts); 93 udev->buff[udev->head].input_event_sec = ts.tv_sec; 94 udev->buff[udev->head].input_event_usec = ts.tv_nsec / NSEC_PER_USEC; 95 udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE; 96 97 wake_up_interruptible(&udev->waitq); 98 99 return 0; 100 } 101 102 /* Atomically allocate an ID for the given request. Returns 0 on success. */ 103 static bool uinput_request_alloc_id(struct uinput_device *udev, 104 struct uinput_request *request) 105 { 106 unsigned int id; 107 bool reserved = false; 108 109 spin_lock(&udev->requests_lock); 110 111 for (id = 0; id < UINPUT_NUM_REQUESTS; id++) { 112 if (!udev->requests[id]) { 113 request->id = id; 114 udev->requests[id] = request; 115 reserved = true; 116 break; 117 } 118 } 119 120 spin_unlock(&udev->requests_lock); 121 return reserved; 122 } 123 124 static struct uinput_request *uinput_request_find(struct uinput_device *udev, 125 unsigned int id) 126 { 127 /* Find an input request, by ID. Returns NULL if the ID isn't valid. */ 128 if (id >= UINPUT_NUM_REQUESTS) 129 return NULL; 130 131 return udev->requests[id]; 132 } 133 134 static int uinput_request_reserve_slot(struct uinput_device *udev, 135 struct uinput_request *request) 136 { 137 /* Allocate slot. If none are available right away, wait. */ 138 return wait_event_interruptible(udev->requests_waitq, 139 uinput_request_alloc_id(udev, request)); 140 } 141 142 static void uinput_request_release_slot(struct uinput_device *udev, 143 unsigned int id) 144 { 145 /* Mark slot as available */ 146 spin_lock(&udev->requests_lock); 147 udev->requests[id] = NULL; 148 spin_unlock(&udev->requests_lock); 149 150 wake_up(&udev->requests_waitq); 151 } 152 153 static int uinput_request_send(struct uinput_device *udev, 154 struct uinput_request *request) 155 { 156 int retval; 157 158 retval = mutex_lock_interruptible(&udev->mutex); 159 if (retval) 160 return retval; 161 162 if (udev->state != UIST_CREATED) { 163 retval = -ENODEV; 164 goto out; 165 } 166 167 init_completion(&request->done); 168 169 /* 170 * Tell our userspace application about this new request 171 * by queueing an input event. 172 */ 173 uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id); 174 175 out: 176 mutex_unlock(&udev->mutex); 177 return retval; 178 } 179 180 static int uinput_request_submit(struct uinput_device *udev, 181 struct uinput_request *request) 182 { 183 int retval; 184 185 retval = uinput_request_reserve_slot(udev, request); 186 if (retval) 187 return retval; 188 189 retval = uinput_request_send(udev, request); 190 if (retval) 191 goto out; 192 193 if (!wait_for_completion_timeout(&request->done, 30 * HZ)) { 194 retval = -ETIMEDOUT; 195 goto out; 196 } 197 198 retval = request->retval; 199 200 out: 201 uinput_request_release_slot(udev, request->id); 202 return retval; 203 } 204 205 /* 206 * Fail all outstanding requests so handlers don't wait for the userspace 207 * to finish processing them. 208 */ 209 static void uinput_flush_requests(struct uinput_device *udev) 210 { 211 struct uinput_request *request; 212 int i; 213 214 spin_lock(&udev->requests_lock); 215 216 for (i = 0; i < UINPUT_NUM_REQUESTS; i++) { 217 request = udev->requests[i]; 218 if (request) { 219 request->retval = -ENODEV; 220 complete(&request->done); 221 } 222 } 223 224 spin_unlock(&udev->requests_lock); 225 } 226 227 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain) 228 { 229 uinput_dev_event(dev, EV_FF, FF_GAIN, gain); 230 } 231 232 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude) 233 { 234 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude); 235 } 236 237 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value) 238 { 239 return uinput_dev_event(dev, EV_FF, effect_id, value); 240 } 241 242 static int uinput_dev_upload_effect(struct input_dev *dev, 243 struct ff_effect *effect, 244 struct ff_effect *old) 245 { 246 struct uinput_device *udev = input_get_drvdata(dev); 247 struct uinput_request request; 248 249 /* 250 * uinput driver does not currently support periodic effects with 251 * custom waveform since it does not have a way to pass buffer of 252 * samples (custom_data) to userspace. If ever there is a device 253 * supporting custom waveforms we would need to define an additional 254 * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out. 255 */ 256 if (effect->type == FF_PERIODIC && 257 effect->u.periodic.waveform == FF_CUSTOM) 258 return -EINVAL; 259 260 request.code = UI_FF_UPLOAD; 261 request.u.upload.effect = effect; 262 request.u.upload.old = old; 263 264 return uinput_request_submit(udev, &request); 265 } 266 267 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id) 268 { 269 struct uinput_device *udev = input_get_drvdata(dev); 270 struct uinput_request request; 271 272 if (!test_bit(EV_FF, dev->evbit)) 273 return -ENOSYS; 274 275 request.code = UI_FF_ERASE; 276 request.u.effect_id = effect_id; 277 278 return uinput_request_submit(udev, &request); 279 } 280 281 static int uinput_dev_flush(struct input_dev *dev, struct file *file) 282 { 283 /* 284 * If we are called with file == NULL that means we are tearing 285 * down the device, and therefore we can not handle FF erase 286 * requests: either we are handling UI_DEV_DESTROY (and holding 287 * the udev->mutex), or the file descriptor is closed and there is 288 * nobody on the other side anymore. 289 */ 290 return file ? input_ff_flush(dev, file) : 0; 291 } 292 293 static void uinput_destroy_device(struct uinput_device *udev) 294 { 295 const char *name, *phys; 296 struct input_dev *dev = udev->dev; 297 enum uinput_state old_state = udev->state; 298 299 udev->state = UIST_NEW_DEVICE; 300 301 if (dev) { 302 name = dev->name; 303 phys = dev->phys; 304 if (old_state == UIST_CREATED) { 305 uinput_flush_requests(udev); 306 input_unregister_device(dev); 307 } else { 308 input_free_device(dev); 309 } 310 kfree(name); 311 kfree(phys); 312 udev->dev = NULL; 313 } 314 } 315 316 static int uinput_create_device(struct uinput_device *udev) 317 { 318 struct input_dev *dev = udev->dev; 319 int error, nslot; 320 321 if (udev->state != UIST_SETUP_COMPLETE) { 322 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME); 323 return -EINVAL; 324 } 325 326 if (test_bit(EV_ABS, dev->evbit)) { 327 input_alloc_absinfo(dev); 328 if (!dev->absinfo) { 329 error = -EINVAL; 330 goto fail1; 331 } 332 333 if (test_bit(ABS_MT_SLOT, dev->absbit)) { 334 nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1; 335 error = input_mt_init_slots(dev, nslot, 0); 336 if (error) 337 goto fail1; 338 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { 339 input_set_events_per_packet(dev, 60); 340 } 341 } 342 343 if (test_bit(EV_FF, dev->evbit) && !udev->ff_effects_max) { 344 printk(KERN_DEBUG "%s: ff_effects_max should be non-zero when FF_BIT is set\n", 345 UINPUT_NAME); 346 error = -EINVAL; 347 goto fail1; 348 } 349 350 if (udev->ff_effects_max) { 351 error = input_ff_create(dev, udev->ff_effects_max); 352 if (error) 353 goto fail1; 354 355 dev->ff->upload = uinput_dev_upload_effect; 356 dev->ff->erase = uinput_dev_erase_effect; 357 dev->ff->playback = uinput_dev_playback; 358 dev->ff->set_gain = uinput_dev_set_gain; 359 dev->ff->set_autocenter = uinput_dev_set_autocenter; 360 /* 361 * The standard input_ff_flush() implementation does 362 * not quite work for uinput as we can't reasonably 363 * handle FF requests during device teardown. 364 */ 365 dev->flush = uinput_dev_flush; 366 } 367 368 dev->event = uinput_dev_event; 369 370 input_set_drvdata(udev->dev, udev); 371 372 error = input_register_device(udev->dev); 373 if (error) 374 goto fail2; 375 376 udev->state = UIST_CREATED; 377 378 return 0; 379 380 fail2: input_ff_destroy(dev); 381 fail1: uinput_destroy_device(udev); 382 return error; 383 } 384 385 static int uinput_open(struct inode *inode, struct file *file) 386 { 387 struct uinput_device *newdev; 388 389 newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL); 390 if (!newdev) 391 return -ENOMEM; 392 393 mutex_init(&newdev->mutex); 394 spin_lock_init(&newdev->requests_lock); 395 init_waitqueue_head(&newdev->requests_waitq); 396 init_waitqueue_head(&newdev->waitq); 397 newdev->state = UIST_NEW_DEVICE; 398 399 file->private_data = newdev; 400 nonseekable_open(inode, file); 401 402 return 0; 403 } 404 405 static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code, 406 const struct input_absinfo *abs) 407 { 408 int min, max; 409 410 min = abs->minimum; 411 max = abs->maximum; 412 413 if ((min != 0 || max != 0) && max <= min) { 414 printk(KERN_DEBUG 415 "%s: invalid abs[%02x] min:%d max:%d\n", 416 UINPUT_NAME, code, min, max); 417 return -EINVAL; 418 } 419 420 if (abs->flat > max - min) { 421 printk(KERN_DEBUG 422 "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n", 423 UINPUT_NAME, code, abs->flat, min, max); 424 return -EINVAL; 425 } 426 427 return 0; 428 } 429 430 static int uinput_validate_absbits(struct input_dev *dev) 431 { 432 unsigned int cnt; 433 int error; 434 435 if (!test_bit(EV_ABS, dev->evbit)) 436 return 0; 437 438 /* 439 * Check if absmin/absmax/absfuzz/absflat are sane. 440 */ 441 442 for_each_set_bit(cnt, dev->absbit, ABS_CNT) { 443 if (!dev->absinfo) 444 return -EINVAL; 445 446 error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]); 447 if (error) 448 return error; 449 } 450 451 return 0; 452 } 453 454 static int uinput_dev_setup(struct uinput_device *udev, 455 struct uinput_setup __user *arg) 456 { 457 struct uinput_setup setup; 458 struct input_dev *dev; 459 460 if (udev->state == UIST_CREATED) 461 return -EINVAL; 462 463 if (copy_from_user(&setup, arg, sizeof(setup))) 464 return -EFAULT; 465 466 if (!setup.name[0]) 467 return -EINVAL; 468 469 dev = udev->dev; 470 dev->id = setup.id; 471 udev->ff_effects_max = setup.ff_effects_max; 472 473 kfree(dev->name); 474 dev->name = kstrndup(setup.name, UINPUT_MAX_NAME_SIZE, GFP_KERNEL); 475 if (!dev->name) 476 return -ENOMEM; 477 478 udev->state = UIST_SETUP_COMPLETE; 479 return 0; 480 } 481 482 static int uinput_abs_setup(struct uinput_device *udev, 483 struct uinput_setup __user *arg, size_t size) 484 { 485 struct uinput_abs_setup setup = {}; 486 struct input_dev *dev; 487 int error; 488 489 if (size > sizeof(setup)) 490 return -E2BIG; 491 492 if (udev->state == UIST_CREATED) 493 return -EINVAL; 494 495 if (copy_from_user(&setup, arg, size)) 496 return -EFAULT; 497 498 if (setup.code > ABS_MAX) 499 return -ERANGE; 500 501 dev = udev->dev; 502 503 error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo); 504 if (error) 505 return error; 506 507 input_alloc_absinfo(dev); 508 if (!dev->absinfo) 509 return -ENOMEM; 510 511 set_bit(setup.code, dev->absbit); 512 dev->absinfo[setup.code] = setup.absinfo; 513 return 0; 514 } 515 516 /* legacy setup via write() */ 517 static int uinput_setup_device_legacy(struct uinput_device *udev, 518 const char __user *buffer, size_t count) 519 { 520 struct uinput_user_dev *user_dev; 521 struct input_dev *dev; 522 int i; 523 int retval; 524 525 if (count != sizeof(struct uinput_user_dev)) 526 return -EINVAL; 527 528 if (!udev->dev) { 529 udev->dev = input_allocate_device(); 530 if (!udev->dev) 531 return -ENOMEM; 532 } 533 534 dev = udev->dev; 535 536 user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev)); 537 if (IS_ERR(user_dev)) 538 return PTR_ERR(user_dev); 539 540 udev->ff_effects_max = user_dev->ff_effects_max; 541 542 /* Ensure name is filled in */ 543 if (!user_dev->name[0]) { 544 retval = -EINVAL; 545 goto exit; 546 } 547 548 kfree(dev->name); 549 dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE, 550 GFP_KERNEL); 551 if (!dev->name) { 552 retval = -ENOMEM; 553 goto exit; 554 } 555 556 dev->id.bustype = user_dev->id.bustype; 557 dev->id.vendor = user_dev->id.vendor; 558 dev->id.product = user_dev->id.product; 559 dev->id.version = user_dev->id.version; 560 561 for (i = 0; i < ABS_CNT; i++) { 562 input_abs_set_max(dev, i, user_dev->absmax[i]); 563 input_abs_set_min(dev, i, user_dev->absmin[i]); 564 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]); 565 input_abs_set_flat(dev, i, user_dev->absflat[i]); 566 } 567 568 retval = uinput_validate_absbits(dev); 569 if (retval < 0) 570 goto exit; 571 572 udev->state = UIST_SETUP_COMPLETE; 573 retval = count; 574 575 exit: 576 kfree(user_dev); 577 return retval; 578 } 579 580 static ssize_t uinput_inject_events(struct uinput_device *udev, 581 const char __user *buffer, size_t count) 582 { 583 struct input_event ev; 584 size_t bytes = 0; 585 586 if (count != 0 && count < input_event_size()) 587 return -EINVAL; 588 589 while (bytes + input_event_size() <= count) { 590 /* 591 * Note that even if some events were fetched successfully 592 * we are still going to return EFAULT instead of partial 593 * count to let userspace know that it got it's buffers 594 * all wrong. 595 */ 596 if (input_event_from_user(buffer + bytes, &ev)) 597 return -EFAULT; 598 599 input_event(udev->dev, ev.type, ev.code, ev.value); 600 bytes += input_event_size(); 601 } 602 603 return bytes; 604 } 605 606 static ssize_t uinput_write(struct file *file, const char __user *buffer, 607 size_t count, loff_t *ppos) 608 { 609 struct uinput_device *udev = file->private_data; 610 int retval; 611 612 if (count == 0) 613 return 0; 614 615 retval = mutex_lock_interruptible(&udev->mutex); 616 if (retval) 617 return retval; 618 619 retval = udev->state == UIST_CREATED ? 620 uinput_inject_events(udev, buffer, count) : 621 uinput_setup_device_legacy(udev, buffer, count); 622 623 mutex_unlock(&udev->mutex); 624 625 return retval; 626 } 627 628 static bool uinput_fetch_next_event(struct uinput_device *udev, 629 struct input_event *event) 630 { 631 bool have_event; 632 633 spin_lock_irq(&udev->dev->event_lock); 634 635 have_event = udev->head != udev->tail; 636 if (have_event) { 637 *event = udev->buff[udev->tail]; 638 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE; 639 } 640 641 spin_unlock_irq(&udev->dev->event_lock); 642 643 return have_event; 644 } 645 646 static ssize_t uinput_events_to_user(struct uinput_device *udev, 647 char __user *buffer, size_t count) 648 { 649 struct input_event event; 650 size_t read = 0; 651 652 while (read + input_event_size() <= count && 653 uinput_fetch_next_event(udev, &event)) { 654 655 if (input_event_to_user(buffer + read, &event)) 656 return -EFAULT; 657 658 read += input_event_size(); 659 } 660 661 return read; 662 } 663 664 static ssize_t uinput_read(struct file *file, char __user *buffer, 665 size_t count, loff_t *ppos) 666 { 667 struct uinput_device *udev = file->private_data; 668 ssize_t retval; 669 670 if (count != 0 && count < input_event_size()) 671 return -EINVAL; 672 673 do { 674 retval = mutex_lock_interruptible(&udev->mutex); 675 if (retval) 676 return retval; 677 678 if (udev->state != UIST_CREATED) 679 retval = -ENODEV; 680 else if (udev->head == udev->tail && 681 (file->f_flags & O_NONBLOCK)) 682 retval = -EAGAIN; 683 else 684 retval = uinput_events_to_user(udev, buffer, count); 685 686 mutex_unlock(&udev->mutex); 687 688 if (retval || count == 0) 689 break; 690 691 if (!(file->f_flags & O_NONBLOCK)) 692 retval = wait_event_interruptible(udev->waitq, 693 udev->head != udev->tail || 694 udev->state != UIST_CREATED); 695 } while (retval == 0); 696 697 return retval; 698 } 699 700 static __poll_t uinput_poll(struct file *file, poll_table *wait) 701 { 702 struct uinput_device *udev = file->private_data; 703 704 poll_wait(file, &udev->waitq, wait); 705 706 if (udev->head != udev->tail) 707 return EPOLLIN | EPOLLRDNORM; 708 709 return 0; 710 } 711 712 static int uinput_release(struct inode *inode, struct file *file) 713 { 714 struct uinput_device *udev = file->private_data; 715 716 uinput_destroy_device(udev); 717 kfree(udev); 718 719 return 0; 720 } 721 722 #ifdef CONFIG_COMPAT 723 struct uinput_ff_upload_compat { 724 __u32 request_id; 725 __s32 retval; 726 struct ff_effect_compat effect; 727 struct ff_effect_compat old; 728 }; 729 730 static int uinput_ff_upload_to_user(char __user *buffer, 731 const struct uinput_ff_upload *ff_up) 732 { 733 if (in_compat_syscall()) { 734 struct uinput_ff_upload_compat ff_up_compat; 735 736 ff_up_compat.request_id = ff_up->request_id; 737 ff_up_compat.retval = ff_up->retval; 738 /* 739 * It so happens that the pointer that gives us the trouble 740 * is the last field in the structure. Since we don't support 741 * custom waveforms in uinput anyway we can just copy the whole 742 * thing (to the compat size) and ignore the pointer. 743 */ 744 memcpy(&ff_up_compat.effect, &ff_up->effect, 745 sizeof(struct ff_effect_compat)); 746 memcpy(&ff_up_compat.old, &ff_up->old, 747 sizeof(struct ff_effect_compat)); 748 749 if (copy_to_user(buffer, &ff_up_compat, 750 sizeof(struct uinput_ff_upload_compat))) 751 return -EFAULT; 752 } else { 753 if (copy_to_user(buffer, ff_up, 754 sizeof(struct uinput_ff_upload))) 755 return -EFAULT; 756 } 757 758 return 0; 759 } 760 761 static int uinput_ff_upload_from_user(const char __user *buffer, 762 struct uinput_ff_upload *ff_up) 763 { 764 if (in_compat_syscall()) { 765 struct uinput_ff_upload_compat ff_up_compat; 766 767 if (copy_from_user(&ff_up_compat, buffer, 768 sizeof(struct uinput_ff_upload_compat))) 769 return -EFAULT; 770 771 ff_up->request_id = ff_up_compat.request_id; 772 ff_up->retval = ff_up_compat.retval; 773 memcpy(&ff_up->effect, &ff_up_compat.effect, 774 sizeof(struct ff_effect_compat)); 775 memcpy(&ff_up->old, &ff_up_compat.old, 776 sizeof(struct ff_effect_compat)); 777 778 } else { 779 if (copy_from_user(ff_up, buffer, 780 sizeof(struct uinput_ff_upload))) 781 return -EFAULT; 782 } 783 784 return 0; 785 } 786 787 #else 788 789 static int uinput_ff_upload_to_user(char __user *buffer, 790 const struct uinput_ff_upload *ff_up) 791 { 792 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload))) 793 return -EFAULT; 794 795 return 0; 796 } 797 798 static int uinput_ff_upload_from_user(const char __user *buffer, 799 struct uinput_ff_upload *ff_up) 800 { 801 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload))) 802 return -EFAULT; 803 804 return 0; 805 } 806 807 #endif 808 809 #define uinput_set_bit(_arg, _bit, _max) \ 810 ({ \ 811 int __ret = 0; \ 812 if (udev->state == UIST_CREATED) \ 813 __ret = -EINVAL; \ 814 else if ((_arg) > (_max)) \ 815 __ret = -EINVAL; \ 816 else set_bit((_arg), udev->dev->_bit); \ 817 __ret; \ 818 }) 819 820 static int uinput_str_to_user(void __user *dest, const char *str, 821 unsigned int maxlen) 822 { 823 char __user *p = dest; 824 int len, ret; 825 826 if (!str) 827 return -ENOENT; 828 829 if (maxlen == 0) 830 return -EINVAL; 831 832 len = strlen(str) + 1; 833 if (len > maxlen) 834 len = maxlen; 835 836 ret = copy_to_user(p, str, len); 837 if (ret) 838 return -EFAULT; 839 840 /* force terminating '\0' */ 841 ret = put_user(0, p + len - 1); 842 return ret ? -EFAULT : len; 843 } 844 845 static long uinput_ioctl_handler(struct file *file, unsigned int cmd, 846 unsigned long arg, void __user *p) 847 { 848 int retval; 849 struct uinput_device *udev = file->private_data; 850 struct uinput_ff_upload ff_up; 851 struct uinput_ff_erase ff_erase; 852 struct uinput_request *req; 853 char *phys; 854 const char *name; 855 unsigned int size; 856 857 retval = mutex_lock_interruptible(&udev->mutex); 858 if (retval) 859 return retval; 860 861 if (!udev->dev) { 862 udev->dev = input_allocate_device(); 863 if (!udev->dev) { 864 retval = -ENOMEM; 865 goto out; 866 } 867 } 868 869 switch (cmd) { 870 case UI_GET_VERSION: 871 if (put_user(UINPUT_VERSION, (unsigned int __user *)p)) 872 retval = -EFAULT; 873 goto out; 874 875 case UI_DEV_CREATE: 876 retval = uinput_create_device(udev); 877 goto out; 878 879 case UI_DEV_DESTROY: 880 uinput_destroy_device(udev); 881 goto out; 882 883 case UI_DEV_SETUP: 884 retval = uinput_dev_setup(udev, p); 885 goto out; 886 887 /* UI_ABS_SETUP is handled in the variable size ioctls */ 888 889 case UI_SET_EVBIT: 890 retval = uinput_set_bit(arg, evbit, EV_MAX); 891 goto out; 892 893 case UI_SET_KEYBIT: 894 retval = uinput_set_bit(arg, keybit, KEY_MAX); 895 goto out; 896 897 case UI_SET_RELBIT: 898 retval = uinput_set_bit(arg, relbit, REL_MAX); 899 goto out; 900 901 case UI_SET_ABSBIT: 902 retval = uinput_set_bit(arg, absbit, ABS_MAX); 903 goto out; 904 905 case UI_SET_MSCBIT: 906 retval = uinput_set_bit(arg, mscbit, MSC_MAX); 907 goto out; 908 909 case UI_SET_LEDBIT: 910 retval = uinput_set_bit(arg, ledbit, LED_MAX); 911 goto out; 912 913 case UI_SET_SNDBIT: 914 retval = uinput_set_bit(arg, sndbit, SND_MAX); 915 goto out; 916 917 case UI_SET_FFBIT: 918 retval = uinput_set_bit(arg, ffbit, FF_MAX); 919 goto out; 920 921 case UI_SET_SWBIT: 922 retval = uinput_set_bit(arg, swbit, SW_MAX); 923 goto out; 924 925 case UI_SET_PROPBIT: 926 retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX); 927 goto out; 928 929 case UI_SET_PHYS: 930 if (udev->state == UIST_CREATED) { 931 retval = -EINVAL; 932 goto out; 933 } 934 935 phys = strndup_user(p, 1024); 936 if (IS_ERR(phys)) { 937 retval = PTR_ERR(phys); 938 goto out; 939 } 940 941 kfree(udev->dev->phys); 942 udev->dev->phys = phys; 943 goto out; 944 945 case UI_BEGIN_FF_UPLOAD: 946 retval = uinput_ff_upload_from_user(p, &ff_up); 947 if (retval) 948 goto out; 949 950 req = uinput_request_find(udev, ff_up.request_id); 951 if (!req || req->code != UI_FF_UPLOAD || 952 !req->u.upload.effect) { 953 retval = -EINVAL; 954 goto out; 955 } 956 957 ff_up.retval = 0; 958 ff_up.effect = *req->u.upload.effect; 959 if (req->u.upload.old) 960 ff_up.old = *req->u.upload.old; 961 else 962 memset(&ff_up.old, 0, sizeof(struct ff_effect)); 963 964 retval = uinput_ff_upload_to_user(p, &ff_up); 965 goto out; 966 967 case UI_BEGIN_FF_ERASE: 968 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { 969 retval = -EFAULT; 970 goto out; 971 } 972 973 req = uinput_request_find(udev, ff_erase.request_id); 974 if (!req || req->code != UI_FF_ERASE) { 975 retval = -EINVAL; 976 goto out; 977 } 978 979 ff_erase.retval = 0; 980 ff_erase.effect_id = req->u.effect_id; 981 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) { 982 retval = -EFAULT; 983 goto out; 984 } 985 986 goto out; 987 988 case UI_END_FF_UPLOAD: 989 retval = uinput_ff_upload_from_user(p, &ff_up); 990 if (retval) 991 goto out; 992 993 req = uinput_request_find(udev, ff_up.request_id); 994 if (!req || req->code != UI_FF_UPLOAD || 995 !req->u.upload.effect) { 996 retval = -EINVAL; 997 goto out; 998 } 999 1000 req->retval = ff_up.retval; 1001 complete(&req->done); 1002 goto out; 1003 1004 case UI_END_FF_ERASE: 1005 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { 1006 retval = -EFAULT; 1007 goto out; 1008 } 1009 1010 req = uinput_request_find(udev, ff_erase.request_id); 1011 if (!req || req->code != UI_FF_ERASE) { 1012 retval = -EINVAL; 1013 goto out; 1014 } 1015 1016 req->retval = ff_erase.retval; 1017 complete(&req->done); 1018 goto out; 1019 } 1020 1021 size = _IOC_SIZE(cmd); 1022 1023 /* Now check variable-length commands */ 1024 switch (cmd & ~IOCSIZE_MASK) { 1025 case UI_GET_SYSNAME(0): 1026 if (udev->state != UIST_CREATED) { 1027 retval = -ENOENT; 1028 goto out; 1029 } 1030 name = dev_name(&udev->dev->dev); 1031 retval = uinput_str_to_user(p, name, size); 1032 goto out; 1033 1034 case UI_ABS_SETUP & ~IOCSIZE_MASK: 1035 retval = uinput_abs_setup(udev, p, size); 1036 goto out; 1037 } 1038 1039 retval = -EINVAL; 1040 out: 1041 mutex_unlock(&udev->mutex); 1042 return retval; 1043 } 1044 1045 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1046 { 1047 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg); 1048 } 1049 1050 #ifdef CONFIG_COMPAT 1051 1052 #define UI_SET_PHYS_COMPAT _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t) 1053 1054 static long uinput_compat_ioctl(struct file *file, 1055 unsigned int cmd, unsigned long arg) 1056 { 1057 if (cmd == UI_SET_PHYS_COMPAT) 1058 cmd = UI_SET_PHYS; 1059 1060 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg)); 1061 } 1062 #endif 1063 1064 static const struct file_operations uinput_fops = { 1065 .owner = THIS_MODULE, 1066 .open = uinput_open, 1067 .release = uinput_release, 1068 .read = uinput_read, 1069 .write = uinput_write, 1070 .poll = uinput_poll, 1071 .unlocked_ioctl = uinput_ioctl, 1072 #ifdef CONFIG_COMPAT 1073 .compat_ioctl = uinput_compat_ioctl, 1074 #endif 1075 .llseek = no_llseek, 1076 }; 1077 1078 static struct miscdevice uinput_misc = { 1079 .fops = &uinput_fops, 1080 .minor = UINPUT_MINOR, 1081 .name = UINPUT_NAME, 1082 }; 1083 module_misc_device(uinput_misc); 1084 1085 MODULE_ALIAS_MISCDEV(UINPUT_MINOR); 1086 MODULE_ALIAS("devname:" UINPUT_NAME); 1087 1088 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho"); 1089 MODULE_DESCRIPTION("User level driver support for input subsystem"); 1090 MODULE_LICENSE("GPL"); 1091