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