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 "../input-compat.h" 41 42 static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 43 { 44 struct uinput_device *udev = input_get_drvdata(dev); 45 46 udev->buff[udev->head].type = type; 47 udev->buff[udev->head].code = code; 48 udev->buff[udev->head].value = value; 49 do_gettimeofday(&udev->buff[udev->head].time); 50 udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE; 51 52 wake_up_interruptible(&udev->waitq); 53 54 return 0; 55 } 56 57 /* Atomically allocate an ID for the given request. Returns 0 on success. */ 58 static int uinput_request_alloc_id(struct uinput_device *udev, struct uinput_request *request) 59 { 60 int id; 61 int err = -1; 62 63 spin_lock(&udev->requests_lock); 64 65 for (id = 0; id < UINPUT_NUM_REQUESTS; id++) { 66 if (!udev->requests[id]) { 67 request->id = id; 68 udev->requests[id] = request; 69 err = 0; 70 break; 71 } 72 } 73 74 spin_unlock(&udev->requests_lock); 75 return err; 76 } 77 78 static struct uinput_request *uinput_request_find(struct uinput_device *udev, int id) 79 { 80 /* Find an input request, by ID. Returns NULL if the ID isn't valid. */ 81 if (id >= UINPUT_NUM_REQUESTS || id < 0) 82 return NULL; 83 84 return udev->requests[id]; 85 } 86 87 static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request) 88 { 89 /* Allocate slot. If none are available right away, wait. */ 90 return wait_event_interruptible(udev->requests_waitq, 91 !uinput_request_alloc_id(udev, request)); 92 } 93 94 static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request) 95 { 96 /* Mark slot as available */ 97 udev->requests[request->id] = NULL; 98 wake_up(&udev->requests_waitq); 99 100 complete(&request->done); 101 } 102 103 static int uinput_request_submit(struct uinput_device *udev, struct uinput_request *request) 104 { 105 int retval; 106 107 retval = uinput_request_reserve_slot(udev, request); 108 if (retval) 109 return retval; 110 111 retval = mutex_lock_interruptible(&udev->mutex); 112 if (retval) 113 return retval; 114 115 if (udev->state != UIST_CREATED) { 116 retval = -ENODEV; 117 goto out; 118 } 119 120 /* Tell our userspace app about this new request by queueing an input event */ 121 uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id); 122 123 out: 124 mutex_unlock(&udev->mutex); 125 return retval; 126 } 127 128 /* 129 * Fail all ouitstanding requests so handlers don't wait for the userspace 130 * to finish processing them. 131 */ 132 static void uinput_flush_requests(struct uinput_device *udev) 133 { 134 struct uinput_request *request; 135 int i; 136 137 spin_lock(&udev->requests_lock); 138 139 for (i = 0; i < UINPUT_NUM_REQUESTS; i++) { 140 request = udev->requests[i]; 141 if (request) { 142 request->retval = -ENODEV; 143 uinput_request_done(udev, request); 144 } 145 } 146 147 spin_unlock(&udev->requests_lock); 148 } 149 150 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain) 151 { 152 uinput_dev_event(dev, EV_FF, FF_GAIN, gain); 153 } 154 155 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude) 156 { 157 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude); 158 } 159 160 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value) 161 { 162 return uinput_dev_event(dev, EV_FF, effect_id, value); 163 } 164 165 static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old) 166 { 167 struct uinput_device *udev = input_get_drvdata(dev); 168 struct uinput_request request; 169 int retval; 170 171 /* 172 * uinput driver does not currently support periodic effects with 173 * custom waveform since it does not have a way to pass buffer of 174 * samples (custom_data) to userspace. If ever there is a device 175 * supporting custom waveforms we would need to define an additional 176 * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out. 177 */ 178 if (effect->type == FF_PERIODIC && 179 effect->u.periodic.waveform == FF_CUSTOM) 180 return -EINVAL; 181 182 request.id = -1; 183 init_completion(&request.done); 184 request.code = UI_FF_UPLOAD; 185 request.u.upload.effect = effect; 186 request.u.upload.old = old; 187 188 retval = uinput_request_submit(udev, &request); 189 if (!retval) { 190 wait_for_completion(&request.done); 191 retval = request.retval; 192 } 193 194 return retval; 195 } 196 197 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id) 198 { 199 struct uinput_device *udev = input_get_drvdata(dev); 200 struct uinput_request request; 201 int retval; 202 203 if (!test_bit(EV_FF, dev->evbit)) 204 return -ENOSYS; 205 206 request.id = -1; 207 init_completion(&request.done); 208 request.code = UI_FF_ERASE; 209 request.u.effect_id = effect_id; 210 211 retval = uinput_request_submit(udev, &request); 212 if (!retval) { 213 wait_for_completion(&request.done); 214 retval = request.retval; 215 } 216 217 return retval; 218 } 219 220 static void uinput_destroy_device(struct uinput_device *udev) 221 { 222 const char *name, *phys; 223 struct input_dev *dev = udev->dev; 224 enum uinput_state old_state = udev->state; 225 226 udev->state = UIST_NEW_DEVICE; 227 228 if (dev) { 229 name = dev->name; 230 phys = dev->phys; 231 if (old_state == UIST_CREATED) { 232 uinput_flush_requests(udev); 233 input_unregister_device(dev); 234 } else { 235 input_free_device(dev); 236 } 237 kfree(name); 238 kfree(phys); 239 udev->dev = NULL; 240 } 241 } 242 243 static int uinput_create_device(struct uinput_device *udev) 244 { 245 struct input_dev *dev = udev->dev; 246 int error; 247 248 if (udev->state != UIST_SETUP_COMPLETE) { 249 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME); 250 return -EINVAL; 251 } 252 253 if (udev->ff_effects_max) { 254 error = input_ff_create(dev, udev->ff_effects_max); 255 if (error) 256 goto fail1; 257 258 dev->ff->upload = uinput_dev_upload_effect; 259 dev->ff->erase = uinput_dev_erase_effect; 260 dev->ff->playback = uinput_dev_playback; 261 dev->ff->set_gain = uinput_dev_set_gain; 262 dev->ff->set_autocenter = uinput_dev_set_autocenter; 263 } 264 265 error = input_register_device(udev->dev); 266 if (error) 267 goto fail2; 268 269 udev->state = UIST_CREATED; 270 271 return 0; 272 273 fail2: input_ff_destroy(dev); 274 fail1: uinput_destroy_device(udev); 275 return error; 276 } 277 278 static int uinput_open(struct inode *inode, struct file *file) 279 { 280 struct uinput_device *newdev; 281 282 newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL); 283 if (!newdev) 284 return -ENOMEM; 285 286 mutex_init(&newdev->mutex); 287 spin_lock_init(&newdev->requests_lock); 288 init_waitqueue_head(&newdev->requests_waitq); 289 init_waitqueue_head(&newdev->waitq); 290 newdev->state = UIST_NEW_DEVICE; 291 292 file->private_data = newdev; 293 nonseekable_open(inode, file); 294 295 return 0; 296 } 297 298 static int uinput_validate_absbits(struct input_dev *dev) 299 { 300 unsigned int cnt; 301 int retval = 0; 302 303 for (cnt = 0; cnt < ABS_CNT; cnt++) { 304 if (!test_bit(cnt, dev->absbit)) 305 continue; 306 307 if (input_abs_get_max(dev, cnt) <= input_abs_get_min(dev, cnt)) { 308 printk(KERN_DEBUG 309 "%s: invalid abs[%02x] min:%d max:%d\n", 310 UINPUT_NAME, cnt, 311 input_abs_get_min(dev, cnt), 312 input_abs_get_max(dev, cnt)); 313 retval = -EINVAL; 314 break; 315 } 316 317 if (input_abs_get_flat(dev, cnt) > 318 input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) { 319 printk(KERN_DEBUG 320 "%s: abs_flat #%02x out of range: %d " 321 "(min:%d/max:%d)\n", 322 UINPUT_NAME, cnt, 323 input_abs_get_flat(dev, cnt), 324 input_abs_get_min(dev, cnt), 325 input_abs_get_max(dev, cnt)); 326 retval = -EINVAL; 327 break; 328 } 329 } 330 return retval; 331 } 332 333 static int uinput_allocate_device(struct uinput_device *udev) 334 { 335 udev->dev = input_allocate_device(); 336 if (!udev->dev) 337 return -ENOMEM; 338 339 udev->dev->event = uinput_dev_event; 340 input_set_drvdata(udev->dev, udev); 341 342 return 0; 343 } 344 345 static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count) 346 { 347 struct uinput_user_dev *user_dev; 348 struct input_dev *dev; 349 char *name; 350 int i, size; 351 int retval; 352 353 if (count != sizeof(struct uinput_user_dev)) 354 return -EINVAL; 355 356 if (!udev->dev) { 357 retval = uinput_allocate_device(udev); 358 if (retval) 359 return retval; 360 } 361 362 dev = udev->dev; 363 364 user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL); 365 if (!user_dev) 366 return -ENOMEM; 367 368 if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) { 369 retval = -EFAULT; 370 goto exit; 371 } 372 373 udev->ff_effects_max = user_dev->ff_effects_max; 374 375 size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1; 376 if (!size) { 377 retval = -EINVAL; 378 goto exit; 379 } 380 381 kfree(dev->name); 382 dev->name = name = kmalloc(size, GFP_KERNEL); 383 if (!name) { 384 retval = -ENOMEM; 385 goto exit; 386 } 387 strlcpy(name, user_dev->name, size); 388 389 dev->id.bustype = user_dev->id.bustype; 390 dev->id.vendor = user_dev->id.vendor; 391 dev->id.product = user_dev->id.product; 392 dev->id.version = user_dev->id.version; 393 394 for (i = 0; i < ABS_CNT; i++) { 395 input_abs_set_max(dev, i, user_dev->absmax[i]); 396 input_abs_set_min(dev, i, user_dev->absmin[i]); 397 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]); 398 input_abs_set_flat(dev, i, user_dev->absflat[i]); 399 } 400 401 /* check if absmin/absmax/absfuzz/absflat are filled as 402 * told in Documentation/input/input-programming.txt */ 403 if (test_bit(EV_ABS, dev->evbit)) { 404 retval = uinput_validate_absbits(dev); 405 if (retval < 0) 406 goto exit; 407 if (test_bit(ABS_MT_SLOT, dev->absbit)) { 408 int nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1; 409 input_mt_create_slots(dev, nslot); 410 input_set_events_per_packet(dev, 6 * 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_PHYS: 684 if (udev->state == UIST_CREATED) { 685 retval = -EINVAL; 686 goto out; 687 } 688 length = strnlen_user(p, 1024); 689 if (length <= 0) { 690 retval = -EFAULT; 691 break; 692 } 693 kfree(udev->dev->phys); 694 udev->dev->phys = phys = kmalloc(length, GFP_KERNEL); 695 if (!phys) { 696 retval = -ENOMEM; 697 break; 698 } 699 if (copy_from_user(phys, p, length)) { 700 udev->dev->phys = NULL; 701 kfree(phys); 702 retval = -EFAULT; 703 break; 704 } 705 phys[length - 1] = '\0'; 706 break; 707 708 case UI_BEGIN_FF_UPLOAD: 709 retval = uinput_ff_upload_from_user(p, &ff_up); 710 if (retval) 711 break; 712 713 req = uinput_request_find(udev, ff_up.request_id); 714 if (!req || req->code != UI_FF_UPLOAD || !req->u.upload.effect) { 715 retval = -EINVAL; 716 break; 717 } 718 719 ff_up.retval = 0; 720 ff_up.effect = *req->u.upload.effect; 721 if (req->u.upload.old) 722 ff_up.old = *req->u.upload.old; 723 else 724 memset(&ff_up.old, 0, sizeof(struct ff_effect)); 725 726 retval = uinput_ff_upload_to_user(p, &ff_up); 727 break; 728 729 case UI_BEGIN_FF_ERASE: 730 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { 731 retval = -EFAULT; 732 break; 733 } 734 735 req = uinput_request_find(udev, ff_erase.request_id); 736 if (!req || req->code != UI_FF_ERASE) { 737 retval = -EINVAL; 738 break; 739 } 740 741 ff_erase.retval = 0; 742 ff_erase.effect_id = req->u.effect_id; 743 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) { 744 retval = -EFAULT; 745 break; 746 } 747 748 break; 749 750 case UI_END_FF_UPLOAD: 751 retval = uinput_ff_upload_from_user(p, &ff_up); 752 if (retval) 753 break; 754 755 req = uinput_request_find(udev, ff_up.request_id); 756 if (!req || req->code != UI_FF_UPLOAD || 757 !req->u.upload.effect) { 758 retval = -EINVAL; 759 break; 760 } 761 762 req->retval = ff_up.retval; 763 uinput_request_done(udev, req); 764 break; 765 766 case UI_END_FF_ERASE: 767 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { 768 retval = -EFAULT; 769 break; 770 } 771 772 req = uinput_request_find(udev, ff_erase.request_id); 773 if (!req || req->code != UI_FF_ERASE) { 774 retval = -EINVAL; 775 break; 776 } 777 778 req->retval = ff_erase.retval; 779 uinput_request_done(udev, req); 780 break; 781 782 default: 783 retval = -EINVAL; 784 } 785 786 out: 787 mutex_unlock(&udev->mutex); 788 return retval; 789 } 790 791 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 792 { 793 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg); 794 } 795 796 #ifdef CONFIG_COMPAT 797 static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 798 { 799 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg)); 800 } 801 #endif 802 803 static const struct file_operations uinput_fops = { 804 .owner = THIS_MODULE, 805 .open = uinput_open, 806 .release = uinput_release, 807 .read = uinput_read, 808 .write = uinput_write, 809 .poll = uinput_poll, 810 .unlocked_ioctl = uinput_ioctl, 811 #ifdef CONFIG_COMPAT 812 .compat_ioctl = uinput_compat_ioctl, 813 #endif 814 .llseek = no_llseek, 815 }; 816 817 static struct miscdevice uinput_misc = { 818 .fops = &uinput_fops, 819 .minor = UINPUT_MINOR, 820 .name = UINPUT_NAME, 821 }; 822 MODULE_ALIAS_MISCDEV(UINPUT_MINOR); 823 MODULE_ALIAS("devname:" UINPUT_NAME); 824 825 static int __init uinput_init(void) 826 { 827 return misc_register(&uinput_misc); 828 } 829 830 static void __exit uinput_exit(void) 831 { 832 misc_deregister(&uinput_misc); 833 } 834 835 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho"); 836 MODULE_DESCRIPTION("User level driver support for input subsystem"); 837 MODULE_LICENSE("GPL"); 838 MODULE_VERSION("0.3"); 839 840 module_init(uinput_init); 841 module_exit(uinput_exit); 842 843