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