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 * 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>) 24 * - updated ff support for the changes in kernel interface 25 * - added MODULE_VERSION 26 * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>) 27 * - added force feedback support 28 * - added UI_SET_PHYS 29 * 0.1 20/06/2002 30 * - first public version 31 */ 32 #include <linux/poll.h> 33 #include <linux/sched.h> 34 #include <linux/slab.h> 35 #include <linux/module.h> 36 #include <linux/init.h> 37 #include <linux/fs.h> 38 #include <linux/miscdevice.h> 39 #include <linux/uinput.h> 40 #include <linux/input/mt.h> 41 #include "../input-compat.h" 42 43 static int uinput_dev_event(struct input_dev *dev, 44 unsigned int type, unsigned int code, int value) 45 { 46 struct uinput_device *udev = input_get_drvdata(dev); 47 48 udev->buff[udev->head].type = type; 49 udev->buff[udev->head].code = code; 50 udev->buff[udev->head].value = value; 51 do_gettimeofday(&udev->buff[udev->head].time); 52 udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE; 53 54 wake_up_interruptible(&udev->waitq); 55 56 return 0; 57 } 58 59 /* Atomically allocate an ID for the given request. Returns 0 on success. */ 60 static bool uinput_request_alloc_id(struct uinput_device *udev, 61 struct uinput_request *request) 62 { 63 unsigned int id; 64 bool reserved = false; 65 66 spin_lock(&udev->requests_lock); 67 68 for (id = 0; id < UINPUT_NUM_REQUESTS; id++) { 69 if (!udev->requests[id]) { 70 request->id = id; 71 udev->requests[id] = request; 72 reserved = true; 73 break; 74 } 75 } 76 77 spin_unlock(&udev->requests_lock); 78 return reserved; 79 } 80 81 static struct uinput_request *uinput_request_find(struct uinput_device *udev, 82 unsigned int id) 83 { 84 /* Find an input request, by ID. Returns NULL if the ID isn't valid. */ 85 if (id >= UINPUT_NUM_REQUESTS) 86 return NULL; 87 88 return udev->requests[id]; 89 } 90 91 static int uinput_request_reserve_slot(struct uinput_device *udev, 92 struct uinput_request *request) 93 { 94 /* Allocate slot. If none are available right away, wait. */ 95 return wait_event_interruptible(udev->requests_waitq, 96 uinput_request_alloc_id(udev, request)); 97 } 98 99 static void uinput_request_done(struct uinput_device *udev, 100 struct uinput_request *request) 101 { 102 /* Mark slot as available */ 103 udev->requests[request->id] = NULL; 104 wake_up(&udev->requests_waitq); 105 106 complete(&request->done); 107 } 108 109 static int uinput_request_send(struct uinput_device *udev, 110 struct uinput_request *request) 111 { 112 int retval; 113 114 retval = mutex_lock_interruptible(&udev->mutex); 115 if (retval) 116 return retval; 117 118 if (udev->state != UIST_CREATED) { 119 retval = -ENODEV; 120 goto out; 121 } 122 123 init_completion(&request->done); 124 125 /* 126 * Tell our userspace application about this new request 127 * by queueing an input event. 128 */ 129 uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id); 130 131 out: 132 mutex_unlock(&udev->mutex); 133 return retval; 134 } 135 136 static int uinput_request_submit(struct uinput_device *udev, 137 struct uinput_request *request) 138 { 139 int error; 140 141 error = uinput_request_reserve_slot(udev, request); 142 if (error) 143 return error; 144 145 error = uinput_request_send(udev, request); 146 if (error) { 147 uinput_request_done(udev, request); 148 return error; 149 } 150 151 wait_for_completion(&request->done); 152 return request->retval; 153 } 154 155 /* 156 * Fail all outstanding requests so handlers don't wait for the userspace 157 * to finish processing them. 158 */ 159 static void uinput_flush_requests(struct uinput_device *udev) 160 { 161 struct uinput_request *request; 162 int i; 163 164 spin_lock(&udev->requests_lock); 165 166 for (i = 0; i < UINPUT_NUM_REQUESTS; i++) { 167 request = udev->requests[i]; 168 if (request) { 169 request->retval = -ENODEV; 170 uinput_request_done(udev, request); 171 } 172 } 173 174 spin_unlock(&udev->requests_lock); 175 } 176 177 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain) 178 { 179 uinput_dev_event(dev, EV_FF, FF_GAIN, gain); 180 } 181 182 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude) 183 { 184 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude); 185 } 186 187 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value) 188 { 189 return uinput_dev_event(dev, EV_FF, effect_id, value); 190 } 191 192 static int uinput_dev_upload_effect(struct input_dev *dev, 193 struct ff_effect *effect, 194 struct ff_effect *old) 195 { 196 struct uinput_device *udev = input_get_drvdata(dev); 197 struct uinput_request request; 198 199 /* 200 * uinput driver does not currently support periodic effects with 201 * custom waveform since it does not have a way to pass buffer of 202 * samples (custom_data) to userspace. If ever there is a device 203 * supporting custom waveforms we would need to define an additional 204 * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out. 205 */ 206 if (effect->type == FF_PERIODIC && 207 effect->u.periodic.waveform == FF_CUSTOM) 208 return -EINVAL; 209 210 request.code = UI_FF_UPLOAD; 211 request.u.upload.effect = effect; 212 request.u.upload.old = old; 213 214 return uinput_request_submit(udev, &request); 215 } 216 217 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id) 218 { 219 struct uinput_device *udev = input_get_drvdata(dev); 220 struct uinput_request request; 221 222 if (!test_bit(EV_FF, dev->evbit)) 223 return -ENOSYS; 224 225 request.code = UI_FF_ERASE; 226 request.u.effect_id = effect_id; 227 228 return uinput_request_submit(udev, &request); 229 } 230 231 static void uinput_destroy_device(struct uinput_device *udev) 232 { 233 const char *name, *phys; 234 struct input_dev *dev = udev->dev; 235 enum uinput_state old_state = udev->state; 236 237 udev->state = UIST_NEW_DEVICE; 238 239 if (dev) { 240 name = dev->name; 241 phys = dev->phys; 242 if (old_state == UIST_CREATED) { 243 uinput_flush_requests(udev); 244 input_unregister_device(dev); 245 } else { 246 input_free_device(dev); 247 } 248 kfree(name); 249 kfree(phys); 250 udev->dev = NULL; 251 } 252 } 253 254 static int uinput_create_device(struct uinput_device *udev) 255 { 256 struct input_dev *dev = udev->dev; 257 int error; 258 259 if (udev->state != UIST_SETUP_COMPLETE) { 260 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME); 261 return -EINVAL; 262 } 263 264 if (udev->ff_effects_max) { 265 error = input_ff_create(dev, udev->ff_effects_max); 266 if (error) 267 goto fail1; 268 269 dev->ff->upload = uinput_dev_upload_effect; 270 dev->ff->erase = uinput_dev_erase_effect; 271 dev->ff->playback = uinput_dev_playback; 272 dev->ff->set_gain = uinput_dev_set_gain; 273 dev->ff->set_autocenter = uinput_dev_set_autocenter; 274 } 275 276 error = input_register_device(udev->dev); 277 if (error) 278 goto fail2; 279 280 udev->state = UIST_CREATED; 281 282 return 0; 283 284 fail2: input_ff_destroy(dev); 285 fail1: uinput_destroy_device(udev); 286 return error; 287 } 288 289 static int uinput_open(struct inode *inode, struct file *file) 290 { 291 struct uinput_device *newdev; 292 293 newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL); 294 if (!newdev) 295 return -ENOMEM; 296 297 mutex_init(&newdev->mutex); 298 spin_lock_init(&newdev->requests_lock); 299 init_waitqueue_head(&newdev->requests_waitq); 300 init_waitqueue_head(&newdev->waitq); 301 newdev->state = UIST_NEW_DEVICE; 302 303 file->private_data = newdev; 304 nonseekable_open(inode, file); 305 306 return 0; 307 } 308 309 static int uinput_validate_absbits(struct input_dev *dev) 310 { 311 unsigned int cnt; 312 int retval = 0; 313 314 for (cnt = 0; cnt < ABS_CNT; cnt++) { 315 int min, max; 316 if (!test_bit(cnt, dev->absbit)) 317 continue; 318 319 min = input_abs_get_min(dev, cnt); 320 max = input_abs_get_max(dev, cnt); 321 322 if ((min != 0 || max != 0) && max <= min) { 323 printk(KERN_DEBUG 324 "%s: invalid abs[%02x] min:%d max:%d\n", 325 UINPUT_NAME, cnt, 326 input_abs_get_min(dev, cnt), 327 input_abs_get_max(dev, cnt)); 328 retval = -EINVAL; 329 break; 330 } 331 332 if (input_abs_get_flat(dev, cnt) > 333 input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) { 334 printk(KERN_DEBUG 335 "%s: abs_flat #%02x out of range: %d " 336 "(min:%d/max:%d)\n", 337 UINPUT_NAME, cnt, 338 input_abs_get_flat(dev, cnt), 339 input_abs_get_min(dev, cnt), 340 input_abs_get_max(dev, cnt)); 341 retval = -EINVAL; 342 break; 343 } 344 } 345 return retval; 346 } 347 348 static int uinput_allocate_device(struct uinput_device *udev) 349 { 350 udev->dev = input_allocate_device(); 351 if (!udev->dev) 352 return -ENOMEM; 353 354 udev->dev->event = uinput_dev_event; 355 input_set_drvdata(udev->dev, udev); 356 357 return 0; 358 } 359 360 static int uinput_setup_device(struct uinput_device *udev, 361 const char __user *buffer, size_t count) 362 { 363 struct uinput_user_dev *user_dev; 364 struct input_dev *dev; 365 int i; 366 int retval; 367 368 if (count != sizeof(struct uinput_user_dev)) 369 return -EINVAL; 370 371 if (!udev->dev) { 372 retval = uinput_allocate_device(udev); 373 if (retval) 374 return retval; 375 } 376 377 dev = udev->dev; 378 379 user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev)); 380 if (IS_ERR(user_dev)) 381 return PTR_ERR(user_dev); 382 383 udev->ff_effects_max = user_dev->ff_effects_max; 384 385 /* Ensure name is filled in */ 386 if (!user_dev->name[0]) { 387 retval = -EINVAL; 388 goto exit; 389 } 390 391 kfree(dev->name); 392 dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE, 393 GFP_KERNEL); 394 if (!dev->name) { 395 retval = -ENOMEM; 396 goto exit; 397 } 398 399 dev->id.bustype = user_dev->id.bustype; 400 dev->id.vendor = user_dev->id.vendor; 401 dev->id.product = user_dev->id.product; 402 dev->id.version = user_dev->id.version; 403 404 for (i = 0; i < ABS_CNT; i++) { 405 input_abs_set_max(dev, i, user_dev->absmax[i]); 406 input_abs_set_min(dev, i, user_dev->absmin[i]); 407 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]); 408 input_abs_set_flat(dev, i, user_dev->absflat[i]); 409 } 410 411 /* check if absmin/absmax/absfuzz/absflat are filled as 412 * told in Documentation/input/input-programming.txt */ 413 if (test_bit(EV_ABS, dev->evbit)) { 414 retval = uinput_validate_absbits(dev); 415 if (retval < 0) 416 goto exit; 417 if (test_bit(ABS_MT_SLOT, dev->absbit)) { 418 int nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1; 419 input_mt_init_slots(dev, nslot, 0); 420 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { 421 input_set_events_per_packet(dev, 60); 422 } 423 } 424 425 udev->state = UIST_SETUP_COMPLETE; 426 retval = count; 427 428 exit: 429 kfree(user_dev); 430 return retval; 431 } 432 433 static ssize_t uinput_inject_event(struct uinput_device *udev, 434 const char __user *buffer, size_t count) 435 { 436 struct input_event ev; 437 438 if (count < input_event_size()) 439 return -EINVAL; 440 441 if (input_event_from_user(buffer, &ev)) 442 return -EFAULT; 443 444 input_event(udev->dev, ev.type, ev.code, ev.value); 445 446 return input_event_size(); 447 } 448 449 static ssize_t uinput_write(struct file *file, const char __user *buffer, 450 size_t count, loff_t *ppos) 451 { 452 struct uinput_device *udev = file->private_data; 453 int retval; 454 455 if (count == 0) 456 return 0; 457 458 retval = mutex_lock_interruptible(&udev->mutex); 459 if (retval) 460 return retval; 461 462 retval = udev->state == UIST_CREATED ? 463 uinput_inject_event(udev, buffer, count) : 464 uinput_setup_device(udev, buffer, count); 465 466 mutex_unlock(&udev->mutex); 467 468 return retval; 469 } 470 471 static bool uinput_fetch_next_event(struct uinput_device *udev, 472 struct input_event *event) 473 { 474 bool have_event; 475 476 spin_lock_irq(&udev->dev->event_lock); 477 478 have_event = udev->head != udev->tail; 479 if (have_event) { 480 *event = udev->buff[udev->tail]; 481 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE; 482 } 483 484 spin_unlock_irq(&udev->dev->event_lock); 485 486 return have_event; 487 } 488 489 static ssize_t uinput_events_to_user(struct uinput_device *udev, 490 char __user *buffer, size_t count) 491 { 492 struct input_event event; 493 size_t read = 0; 494 495 while (read + input_event_size() <= count && 496 uinput_fetch_next_event(udev, &event)) { 497 498 if (input_event_to_user(buffer + read, &event)) 499 return -EFAULT; 500 501 read += input_event_size(); 502 } 503 504 return read; 505 } 506 507 static ssize_t uinput_read(struct file *file, char __user *buffer, 508 size_t count, loff_t *ppos) 509 { 510 struct uinput_device *udev = file->private_data; 511 ssize_t retval; 512 513 if (count != 0 && count < input_event_size()) 514 return -EINVAL; 515 516 do { 517 retval = mutex_lock_interruptible(&udev->mutex); 518 if (retval) 519 return retval; 520 521 if (udev->state != UIST_CREATED) 522 retval = -ENODEV; 523 else if (udev->head == udev->tail && 524 (file->f_flags & O_NONBLOCK)) 525 retval = -EAGAIN; 526 else 527 retval = uinput_events_to_user(udev, buffer, count); 528 529 mutex_unlock(&udev->mutex); 530 531 if (retval || count == 0) 532 break; 533 534 if (!(file->f_flags & O_NONBLOCK)) 535 retval = wait_event_interruptible(udev->waitq, 536 udev->head != udev->tail || 537 udev->state != UIST_CREATED); 538 } while (retval == 0); 539 540 return retval; 541 } 542 543 static unsigned int uinput_poll(struct file *file, poll_table *wait) 544 { 545 struct uinput_device *udev = file->private_data; 546 547 poll_wait(file, &udev->waitq, wait); 548 549 if (udev->head != udev->tail) 550 return POLLIN | POLLRDNORM; 551 552 return 0; 553 } 554 555 static int uinput_release(struct inode *inode, struct file *file) 556 { 557 struct uinput_device *udev = file->private_data; 558 559 uinput_destroy_device(udev); 560 kfree(udev); 561 562 return 0; 563 } 564 565 #ifdef CONFIG_COMPAT 566 struct uinput_ff_upload_compat { 567 __u32 request_id; 568 __s32 retval; 569 struct ff_effect_compat effect; 570 struct ff_effect_compat old; 571 }; 572 573 static int uinput_ff_upload_to_user(char __user *buffer, 574 const struct uinput_ff_upload *ff_up) 575 { 576 if (INPUT_COMPAT_TEST) { 577 struct uinput_ff_upload_compat ff_up_compat; 578 579 ff_up_compat.request_id = ff_up->request_id; 580 ff_up_compat.retval = ff_up->retval; 581 /* 582 * It so happens that the pointer that gives us the trouble 583 * is the last field in the structure. Since we don't support 584 * custom waveforms in uinput anyway we can just copy the whole 585 * thing (to the compat size) and ignore the pointer. 586 */ 587 memcpy(&ff_up_compat.effect, &ff_up->effect, 588 sizeof(struct ff_effect_compat)); 589 memcpy(&ff_up_compat.old, &ff_up->old, 590 sizeof(struct ff_effect_compat)); 591 592 if (copy_to_user(buffer, &ff_up_compat, 593 sizeof(struct uinput_ff_upload_compat))) 594 return -EFAULT; 595 } else { 596 if (copy_to_user(buffer, ff_up, 597 sizeof(struct uinput_ff_upload))) 598 return -EFAULT; 599 } 600 601 return 0; 602 } 603 604 static int uinput_ff_upload_from_user(const char __user *buffer, 605 struct uinput_ff_upload *ff_up) 606 { 607 if (INPUT_COMPAT_TEST) { 608 struct uinput_ff_upload_compat ff_up_compat; 609 610 if (copy_from_user(&ff_up_compat, buffer, 611 sizeof(struct uinput_ff_upload_compat))) 612 return -EFAULT; 613 614 ff_up->request_id = ff_up_compat.request_id; 615 ff_up->retval = ff_up_compat.retval; 616 memcpy(&ff_up->effect, &ff_up_compat.effect, 617 sizeof(struct ff_effect_compat)); 618 memcpy(&ff_up->old, &ff_up_compat.old, 619 sizeof(struct ff_effect_compat)); 620 621 } else { 622 if (copy_from_user(ff_up, buffer, 623 sizeof(struct uinput_ff_upload))) 624 return -EFAULT; 625 } 626 627 return 0; 628 } 629 630 #else 631 632 static int uinput_ff_upload_to_user(char __user *buffer, 633 const struct uinput_ff_upload *ff_up) 634 { 635 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload))) 636 return -EFAULT; 637 638 return 0; 639 } 640 641 static int uinput_ff_upload_from_user(const char __user *buffer, 642 struct uinput_ff_upload *ff_up) 643 { 644 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload))) 645 return -EFAULT; 646 647 return 0; 648 } 649 650 #endif 651 652 #define uinput_set_bit(_arg, _bit, _max) \ 653 ({ \ 654 int __ret = 0; \ 655 if (udev->state == UIST_CREATED) \ 656 __ret = -EINVAL; \ 657 else if ((_arg) > (_max)) \ 658 __ret = -EINVAL; \ 659 else set_bit((_arg), udev->dev->_bit); \ 660 __ret; \ 661 }) 662 663 static long uinput_ioctl_handler(struct file *file, unsigned int cmd, 664 unsigned long arg, void __user *p) 665 { 666 int retval; 667 struct uinput_device *udev = file->private_data; 668 struct uinput_ff_upload ff_up; 669 struct uinput_ff_erase ff_erase; 670 struct uinput_request *req; 671 char *phys; 672 673 retval = mutex_lock_interruptible(&udev->mutex); 674 if (retval) 675 return retval; 676 677 if (!udev->dev) { 678 retval = uinput_allocate_device(udev); 679 if (retval) 680 goto out; 681 } 682 683 switch (cmd) { 684 case UI_DEV_CREATE: 685 retval = uinput_create_device(udev); 686 break; 687 688 case UI_DEV_DESTROY: 689 uinput_destroy_device(udev); 690 break; 691 692 case UI_SET_EVBIT: 693 retval = uinput_set_bit(arg, evbit, EV_MAX); 694 break; 695 696 case UI_SET_KEYBIT: 697 retval = uinput_set_bit(arg, keybit, KEY_MAX); 698 break; 699 700 case UI_SET_RELBIT: 701 retval = uinput_set_bit(arg, relbit, REL_MAX); 702 break; 703 704 case UI_SET_ABSBIT: 705 retval = uinput_set_bit(arg, absbit, ABS_MAX); 706 break; 707 708 case UI_SET_MSCBIT: 709 retval = uinput_set_bit(arg, mscbit, MSC_MAX); 710 break; 711 712 case UI_SET_LEDBIT: 713 retval = uinput_set_bit(arg, ledbit, LED_MAX); 714 break; 715 716 case UI_SET_SNDBIT: 717 retval = uinput_set_bit(arg, sndbit, SND_MAX); 718 break; 719 720 case UI_SET_FFBIT: 721 retval = uinput_set_bit(arg, ffbit, FF_MAX); 722 break; 723 724 case UI_SET_SWBIT: 725 retval = uinput_set_bit(arg, swbit, SW_MAX); 726 break; 727 728 case UI_SET_PROPBIT: 729 retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX); 730 break; 731 732 case UI_SET_PHYS: 733 if (udev->state == UIST_CREATED) { 734 retval = -EINVAL; 735 goto out; 736 } 737 738 phys = strndup_user(p, 1024); 739 if (IS_ERR(phys)) { 740 retval = PTR_ERR(phys); 741 goto out; 742 } 743 744 kfree(udev->dev->phys); 745 udev->dev->phys = phys; 746 break; 747 748 case UI_BEGIN_FF_UPLOAD: 749 retval = uinput_ff_upload_from_user(p, &ff_up); 750 if (retval) 751 break; 752 753 req = uinput_request_find(udev, ff_up.request_id); 754 if (!req || req->code != UI_FF_UPLOAD || 755 !req->u.upload.effect) { 756 retval = -EINVAL; 757 break; 758 } 759 760 ff_up.retval = 0; 761 ff_up.effect = *req->u.upload.effect; 762 if (req->u.upload.old) 763 ff_up.old = *req->u.upload.old; 764 else 765 memset(&ff_up.old, 0, sizeof(struct ff_effect)); 766 767 retval = uinput_ff_upload_to_user(p, &ff_up); 768 break; 769 770 case UI_BEGIN_FF_ERASE: 771 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { 772 retval = -EFAULT; 773 break; 774 } 775 776 req = uinput_request_find(udev, ff_erase.request_id); 777 if (!req || req->code != UI_FF_ERASE) { 778 retval = -EINVAL; 779 break; 780 } 781 782 ff_erase.retval = 0; 783 ff_erase.effect_id = req->u.effect_id; 784 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) { 785 retval = -EFAULT; 786 break; 787 } 788 789 break; 790 791 case UI_END_FF_UPLOAD: 792 retval = uinput_ff_upload_from_user(p, &ff_up); 793 if (retval) 794 break; 795 796 req = uinput_request_find(udev, ff_up.request_id); 797 if (!req || req->code != UI_FF_UPLOAD || 798 !req->u.upload.effect) { 799 retval = -EINVAL; 800 break; 801 } 802 803 req->retval = ff_up.retval; 804 uinput_request_done(udev, req); 805 break; 806 807 case UI_END_FF_ERASE: 808 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { 809 retval = -EFAULT; 810 break; 811 } 812 813 req = uinput_request_find(udev, ff_erase.request_id); 814 if (!req || req->code != UI_FF_ERASE) { 815 retval = -EINVAL; 816 break; 817 } 818 819 req->retval = ff_erase.retval; 820 uinput_request_done(udev, req); 821 break; 822 823 default: 824 retval = -EINVAL; 825 } 826 827 out: 828 mutex_unlock(&udev->mutex); 829 return retval; 830 } 831 832 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 833 { 834 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg); 835 } 836 837 #ifdef CONFIG_COMPAT 838 static long uinput_compat_ioctl(struct file *file, 839 unsigned int cmd, unsigned long arg) 840 { 841 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg)); 842 } 843 #endif 844 845 static const struct file_operations uinput_fops = { 846 .owner = THIS_MODULE, 847 .open = uinput_open, 848 .release = uinput_release, 849 .read = uinput_read, 850 .write = uinput_write, 851 .poll = uinput_poll, 852 .unlocked_ioctl = uinput_ioctl, 853 #ifdef CONFIG_COMPAT 854 .compat_ioctl = uinput_compat_ioctl, 855 #endif 856 .llseek = no_llseek, 857 }; 858 859 static struct miscdevice uinput_misc = { 860 .fops = &uinput_fops, 861 .minor = UINPUT_MINOR, 862 .name = UINPUT_NAME, 863 }; 864 MODULE_ALIAS_MISCDEV(UINPUT_MINOR); 865 MODULE_ALIAS("devname:" UINPUT_NAME); 866 867 static int __init uinput_init(void) 868 { 869 return misc_register(&uinput_misc); 870 } 871 872 static void __exit uinput_exit(void) 873 { 874 misc_deregister(&uinput_misc); 875 } 876 877 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho"); 878 MODULE_DESCRIPTION("User level driver support for input subsystem"); 879 MODULE_LICENSE("GPL"); 880 MODULE_VERSION("0.3"); 881 882 module_init(uinput_init); 883 module_exit(uinput_exit); 884