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 int min, max; 306 if (!test_bit(cnt, dev->absbit)) 307 continue; 308 309 min = input_abs_get_min(dev, cnt); 310 max = input_abs_get_max(dev, cnt); 311 312 if ((min != 0 || max != 0) && max <= min) { 313 printk(KERN_DEBUG 314 "%s: invalid abs[%02x] min:%d max:%d\n", 315 UINPUT_NAME, cnt, 316 input_abs_get_min(dev, cnt), 317 input_abs_get_max(dev, cnt)); 318 retval = -EINVAL; 319 break; 320 } 321 322 if (input_abs_get_flat(dev, cnt) > 323 input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) { 324 printk(KERN_DEBUG 325 "%s: abs_flat #%02x out of range: %d " 326 "(min:%d/max:%d)\n", 327 UINPUT_NAME, cnt, 328 input_abs_get_flat(dev, cnt), 329 input_abs_get_min(dev, cnt), 330 input_abs_get_max(dev, cnt)); 331 retval = -EINVAL; 332 break; 333 } 334 } 335 return retval; 336 } 337 338 static int uinput_allocate_device(struct uinput_device *udev) 339 { 340 udev->dev = input_allocate_device(); 341 if (!udev->dev) 342 return -ENOMEM; 343 344 udev->dev->event = uinput_dev_event; 345 input_set_drvdata(udev->dev, udev); 346 347 return 0; 348 } 349 350 static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count) 351 { 352 struct uinput_user_dev *user_dev; 353 struct input_dev *dev; 354 int i; 355 int retval; 356 357 if (count != sizeof(struct uinput_user_dev)) 358 return -EINVAL; 359 360 if (!udev->dev) { 361 retval = uinput_allocate_device(udev); 362 if (retval) 363 return retval; 364 } 365 366 dev = udev->dev; 367 368 user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev)); 369 if (IS_ERR(user_dev)) 370 return PTR_ERR(user_dev); 371 372 udev->ff_effects_max = user_dev->ff_effects_max; 373 374 /* Ensure name is filled in */ 375 if (!user_dev->name[0]) { 376 retval = -EINVAL; 377 goto exit; 378 } 379 380 kfree(dev->name); 381 dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE, 382 GFP_KERNEL); 383 if (!dev->name) { 384 retval = -ENOMEM; 385 goto exit; 386 } 387 388 dev->id.bustype = user_dev->id.bustype; 389 dev->id.vendor = user_dev->id.vendor; 390 dev->id.product = user_dev->id.product; 391 dev->id.version = user_dev->id.version; 392 393 for (i = 0; i < ABS_CNT; i++) { 394 input_abs_set_max(dev, i, user_dev->absmax[i]); 395 input_abs_set_min(dev, i, user_dev->absmin[i]); 396 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]); 397 input_abs_set_flat(dev, i, user_dev->absflat[i]); 398 } 399 400 /* check if absmin/absmax/absfuzz/absflat are filled as 401 * told in Documentation/input/input-programming.txt */ 402 if (test_bit(EV_ABS, dev->evbit)) { 403 retval = uinput_validate_absbits(dev); 404 if (retval < 0) 405 goto exit; 406 if (test_bit(ABS_MT_SLOT, dev->absbit)) { 407 int nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1; 408 input_mt_init_slots(dev, nslot); 409 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { 410 input_set_events_per_packet(dev, 60); 411 } 412 } 413 414 udev->state = UIST_SETUP_COMPLETE; 415 retval = count; 416 417 exit: 418 kfree(user_dev); 419 return retval; 420 } 421 422 static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count) 423 { 424 struct input_event ev; 425 426 if (count < input_event_size()) 427 return -EINVAL; 428 429 if (input_event_from_user(buffer, &ev)) 430 return -EFAULT; 431 432 input_event(udev->dev, ev.type, ev.code, ev.value); 433 434 return input_event_size(); 435 } 436 437 static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) 438 { 439 struct uinput_device *udev = file->private_data; 440 int retval; 441 442 retval = mutex_lock_interruptible(&udev->mutex); 443 if (retval) 444 return retval; 445 446 retval = udev->state == UIST_CREATED ? 447 uinput_inject_event(udev, buffer, count) : 448 uinput_setup_device(udev, buffer, count); 449 450 mutex_unlock(&udev->mutex); 451 452 return retval; 453 } 454 455 static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) 456 { 457 struct uinput_device *udev = file->private_data; 458 int retval = 0; 459 460 if (udev->state != UIST_CREATED) 461 return -ENODEV; 462 463 if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK)) 464 return -EAGAIN; 465 466 retval = wait_event_interruptible(udev->waitq, 467 udev->head != udev->tail || udev->state != UIST_CREATED); 468 if (retval) 469 return retval; 470 471 retval = mutex_lock_interruptible(&udev->mutex); 472 if (retval) 473 return retval; 474 475 if (udev->state != UIST_CREATED) { 476 retval = -ENODEV; 477 goto out; 478 } 479 480 while (udev->head != udev->tail && retval + input_event_size() <= count) { 481 if (input_event_to_user(buffer + retval, &udev->buff[udev->tail])) { 482 retval = -EFAULT; 483 goto out; 484 } 485 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE; 486 retval += input_event_size(); 487 } 488 489 out: 490 mutex_unlock(&udev->mutex); 491 492 return retval; 493 } 494 495 static unsigned int uinput_poll(struct file *file, poll_table *wait) 496 { 497 struct uinput_device *udev = file->private_data; 498 499 poll_wait(file, &udev->waitq, wait); 500 501 if (udev->head != udev->tail) 502 return POLLIN | POLLRDNORM; 503 504 return 0; 505 } 506 507 static int uinput_release(struct inode *inode, struct file *file) 508 { 509 struct uinput_device *udev = file->private_data; 510 511 uinput_destroy_device(udev); 512 kfree(udev); 513 514 return 0; 515 } 516 517 #ifdef CONFIG_COMPAT 518 struct uinput_ff_upload_compat { 519 int request_id; 520 int retval; 521 struct ff_effect_compat effect; 522 struct ff_effect_compat old; 523 }; 524 525 static int uinput_ff_upload_to_user(char __user *buffer, 526 const struct uinput_ff_upload *ff_up) 527 { 528 if (INPUT_COMPAT_TEST) { 529 struct uinput_ff_upload_compat ff_up_compat; 530 531 ff_up_compat.request_id = ff_up->request_id; 532 ff_up_compat.retval = ff_up->retval; 533 /* 534 * It so happens that the pointer that gives us the trouble 535 * is the last field in the structure. Since we don't support 536 * custom waveforms in uinput anyway we can just copy the whole 537 * thing (to the compat size) and ignore the pointer. 538 */ 539 memcpy(&ff_up_compat.effect, &ff_up->effect, 540 sizeof(struct ff_effect_compat)); 541 memcpy(&ff_up_compat.old, &ff_up->old, 542 sizeof(struct ff_effect_compat)); 543 544 if (copy_to_user(buffer, &ff_up_compat, 545 sizeof(struct uinput_ff_upload_compat))) 546 return -EFAULT; 547 } else { 548 if (copy_to_user(buffer, ff_up, 549 sizeof(struct uinput_ff_upload))) 550 return -EFAULT; 551 } 552 553 return 0; 554 } 555 556 static int uinput_ff_upload_from_user(const char __user *buffer, 557 struct uinput_ff_upload *ff_up) 558 { 559 if (INPUT_COMPAT_TEST) { 560 struct uinput_ff_upload_compat ff_up_compat; 561 562 if (copy_from_user(&ff_up_compat, buffer, 563 sizeof(struct uinput_ff_upload_compat))) 564 return -EFAULT; 565 566 ff_up->request_id = ff_up_compat.request_id; 567 ff_up->retval = ff_up_compat.retval; 568 memcpy(&ff_up->effect, &ff_up_compat.effect, 569 sizeof(struct ff_effect_compat)); 570 memcpy(&ff_up->old, &ff_up_compat.old, 571 sizeof(struct ff_effect_compat)); 572 573 } else { 574 if (copy_from_user(ff_up, buffer, 575 sizeof(struct uinput_ff_upload))) 576 return -EFAULT; 577 } 578 579 return 0; 580 } 581 582 #else 583 584 static int uinput_ff_upload_to_user(char __user *buffer, 585 const struct uinput_ff_upload *ff_up) 586 { 587 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload))) 588 return -EFAULT; 589 590 return 0; 591 } 592 593 static int uinput_ff_upload_from_user(const char __user *buffer, 594 struct uinput_ff_upload *ff_up) 595 { 596 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload))) 597 return -EFAULT; 598 599 return 0; 600 } 601 602 #endif 603 604 #define uinput_set_bit(_arg, _bit, _max) \ 605 ({ \ 606 int __ret = 0; \ 607 if (udev->state == UIST_CREATED) \ 608 __ret = -EINVAL; \ 609 else if ((_arg) > (_max)) \ 610 __ret = -EINVAL; \ 611 else set_bit((_arg), udev->dev->_bit); \ 612 __ret; \ 613 }) 614 615 static long uinput_ioctl_handler(struct file *file, unsigned int cmd, 616 unsigned long arg, void __user *p) 617 { 618 int retval; 619 struct uinput_device *udev = file->private_data; 620 struct uinput_ff_upload ff_up; 621 struct uinput_ff_erase ff_erase; 622 struct uinput_request *req; 623 char *phys; 624 625 retval = mutex_lock_interruptible(&udev->mutex); 626 if (retval) 627 return retval; 628 629 if (!udev->dev) { 630 retval = uinput_allocate_device(udev); 631 if (retval) 632 goto out; 633 } 634 635 switch (cmd) { 636 case UI_DEV_CREATE: 637 retval = uinput_create_device(udev); 638 break; 639 640 case UI_DEV_DESTROY: 641 uinput_destroy_device(udev); 642 break; 643 644 case UI_SET_EVBIT: 645 retval = uinput_set_bit(arg, evbit, EV_MAX); 646 break; 647 648 case UI_SET_KEYBIT: 649 retval = uinput_set_bit(arg, keybit, KEY_MAX); 650 break; 651 652 case UI_SET_RELBIT: 653 retval = uinput_set_bit(arg, relbit, REL_MAX); 654 break; 655 656 case UI_SET_ABSBIT: 657 retval = uinput_set_bit(arg, absbit, ABS_MAX); 658 break; 659 660 case UI_SET_MSCBIT: 661 retval = uinput_set_bit(arg, mscbit, MSC_MAX); 662 break; 663 664 case UI_SET_LEDBIT: 665 retval = uinput_set_bit(arg, ledbit, LED_MAX); 666 break; 667 668 case UI_SET_SNDBIT: 669 retval = uinput_set_bit(arg, sndbit, SND_MAX); 670 break; 671 672 case UI_SET_FFBIT: 673 retval = uinput_set_bit(arg, ffbit, FF_MAX); 674 break; 675 676 case UI_SET_SWBIT: 677 retval = uinput_set_bit(arg, swbit, SW_MAX); 678 break; 679 680 case UI_SET_PROPBIT: 681 retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX); 682 break; 683 684 case UI_SET_PHYS: 685 if (udev->state == UIST_CREATED) { 686 retval = -EINVAL; 687 goto out; 688 } 689 690 phys = strndup_user(p, 1024); 691 if (IS_ERR(phys)) { 692 retval = PTR_ERR(phys); 693 goto out; 694 } 695 696 kfree(udev->dev->phys); 697 udev->dev->phys = phys; 698 break; 699 700 case UI_BEGIN_FF_UPLOAD: 701 retval = uinput_ff_upload_from_user(p, &ff_up); 702 if (retval) 703 break; 704 705 req = uinput_request_find(udev, ff_up.request_id); 706 if (!req || req->code != UI_FF_UPLOAD || !req->u.upload.effect) { 707 retval = -EINVAL; 708 break; 709 } 710 711 ff_up.retval = 0; 712 ff_up.effect = *req->u.upload.effect; 713 if (req->u.upload.old) 714 ff_up.old = *req->u.upload.old; 715 else 716 memset(&ff_up.old, 0, sizeof(struct ff_effect)); 717 718 retval = uinput_ff_upload_to_user(p, &ff_up); 719 break; 720 721 case UI_BEGIN_FF_ERASE: 722 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { 723 retval = -EFAULT; 724 break; 725 } 726 727 req = uinput_request_find(udev, ff_erase.request_id); 728 if (!req || req->code != UI_FF_ERASE) { 729 retval = -EINVAL; 730 break; 731 } 732 733 ff_erase.retval = 0; 734 ff_erase.effect_id = req->u.effect_id; 735 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) { 736 retval = -EFAULT; 737 break; 738 } 739 740 break; 741 742 case UI_END_FF_UPLOAD: 743 retval = uinput_ff_upload_from_user(p, &ff_up); 744 if (retval) 745 break; 746 747 req = uinput_request_find(udev, ff_up.request_id); 748 if (!req || req->code != UI_FF_UPLOAD || 749 !req->u.upload.effect) { 750 retval = -EINVAL; 751 break; 752 } 753 754 req->retval = ff_up.retval; 755 uinput_request_done(udev, req); 756 break; 757 758 case UI_END_FF_ERASE: 759 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { 760 retval = -EFAULT; 761 break; 762 } 763 764 req = uinput_request_find(udev, ff_erase.request_id); 765 if (!req || req->code != UI_FF_ERASE) { 766 retval = -EINVAL; 767 break; 768 } 769 770 req->retval = ff_erase.retval; 771 uinput_request_done(udev, req); 772 break; 773 774 default: 775 retval = -EINVAL; 776 } 777 778 out: 779 mutex_unlock(&udev->mutex); 780 return retval; 781 } 782 783 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 784 { 785 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg); 786 } 787 788 #ifdef CONFIG_COMPAT 789 static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 790 { 791 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg)); 792 } 793 #endif 794 795 static const struct file_operations uinput_fops = { 796 .owner = THIS_MODULE, 797 .open = uinput_open, 798 .release = uinput_release, 799 .read = uinput_read, 800 .write = uinput_write, 801 .poll = uinput_poll, 802 .unlocked_ioctl = uinput_ioctl, 803 #ifdef CONFIG_COMPAT 804 .compat_ioctl = uinput_compat_ioctl, 805 #endif 806 .llseek = no_llseek, 807 }; 808 809 static struct miscdevice uinput_misc = { 810 .fops = &uinput_fops, 811 .minor = UINPUT_MINOR, 812 .name = UINPUT_NAME, 813 }; 814 MODULE_ALIAS_MISCDEV(UINPUT_MINOR); 815 MODULE_ALIAS("devname:" UINPUT_NAME); 816 817 static int __init uinput_init(void) 818 { 819 return misc_register(&uinput_misc); 820 } 821 822 static void __exit uinput_exit(void) 823 { 824 misc_deregister(&uinput_misc); 825 } 826 827 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho"); 828 MODULE_DESCRIPTION("User level driver support for input subsystem"); 829 MODULE_LICENSE("GPL"); 830 MODULE_VERSION("0.3"); 831 832 module_init(uinput_init); 833 module_exit(uinput_exit); 834 835