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