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 <linux/poll.h> 35 #include <linux/sched.h> 36 #include <linux/slab.h> 37 #include <linux/module.h> 38 #include <linux/init.h> 39 #include <linux/fs.h> 40 #include <linux/miscdevice.h> 41 #include <linux/uinput.h> 42 #include <linux/input/mt.h> 43 #include "../input-compat.h" 44 45 static int uinput_dev_event(struct input_dev *dev, 46 unsigned int type, unsigned int code, int value) 47 { 48 struct uinput_device *udev = input_get_drvdata(dev); 49 50 udev->buff[udev->head].type = type; 51 udev->buff[udev->head].code = code; 52 udev->buff[udev->head].value = value; 53 do_gettimeofday(&udev->buff[udev->head].time); 54 udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE; 55 56 wake_up_interruptible(&udev->waitq); 57 58 return 0; 59 } 60 61 /* Atomically allocate an ID for the given request. Returns 0 on success. */ 62 static bool uinput_request_alloc_id(struct uinput_device *udev, 63 struct uinput_request *request) 64 { 65 unsigned int id; 66 bool reserved = false; 67 68 spin_lock(&udev->requests_lock); 69 70 for (id = 0; id < UINPUT_NUM_REQUESTS; id++) { 71 if (!udev->requests[id]) { 72 request->id = id; 73 udev->requests[id] = request; 74 reserved = true; 75 break; 76 } 77 } 78 79 spin_unlock(&udev->requests_lock); 80 return reserved; 81 } 82 83 static struct uinput_request *uinput_request_find(struct uinput_device *udev, 84 unsigned int id) 85 { 86 /* Find an input request, by ID. Returns NULL if the ID isn't valid. */ 87 if (id >= UINPUT_NUM_REQUESTS) 88 return NULL; 89 90 return udev->requests[id]; 91 } 92 93 static int uinput_request_reserve_slot(struct uinput_device *udev, 94 struct uinput_request *request) 95 { 96 /* Allocate slot. If none are available right away, wait. */ 97 return wait_event_interruptible(udev->requests_waitq, 98 uinput_request_alloc_id(udev, request)); 99 } 100 101 static void uinput_request_done(struct uinput_device *udev, 102 struct uinput_request *request) 103 { 104 /* Mark slot as available */ 105 udev->requests[request->id] = NULL; 106 wake_up(&udev->requests_waitq); 107 108 complete(&request->done); 109 } 110 111 static int uinput_request_send(struct uinput_device *udev, 112 struct uinput_request *request) 113 { 114 int retval; 115 116 retval = mutex_lock_interruptible(&udev->mutex); 117 if (retval) 118 return retval; 119 120 if (udev->state != UIST_CREATED) { 121 retval = -ENODEV; 122 goto out; 123 } 124 125 init_completion(&request->done); 126 127 /* 128 * Tell our userspace application about this new request 129 * by queueing an input event. 130 */ 131 uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id); 132 133 out: 134 mutex_unlock(&udev->mutex); 135 return retval; 136 } 137 138 static int uinput_request_submit(struct uinput_device *udev, 139 struct uinput_request *request) 140 { 141 int error; 142 143 error = uinput_request_reserve_slot(udev, request); 144 if (error) 145 return error; 146 147 error = uinput_request_send(udev, request); 148 if (error) { 149 uinput_request_done(udev, request); 150 return error; 151 } 152 153 wait_for_completion(&request->done); 154 return request->retval; 155 } 156 157 /* 158 * Fail all outstanding requests so handlers don't wait for the userspace 159 * to finish processing them. 160 */ 161 static void uinput_flush_requests(struct uinput_device *udev) 162 { 163 struct uinput_request *request; 164 int i; 165 166 spin_lock(&udev->requests_lock); 167 168 for (i = 0; i < UINPUT_NUM_REQUESTS; i++) { 169 request = udev->requests[i]; 170 if (request) { 171 request->retval = -ENODEV; 172 uinput_request_done(udev, request); 173 } 174 } 175 176 spin_unlock(&udev->requests_lock); 177 } 178 179 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain) 180 { 181 uinput_dev_event(dev, EV_FF, FF_GAIN, gain); 182 } 183 184 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude) 185 { 186 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude); 187 } 188 189 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value) 190 { 191 return uinput_dev_event(dev, EV_FF, effect_id, value); 192 } 193 194 static int uinput_dev_upload_effect(struct input_dev *dev, 195 struct ff_effect *effect, 196 struct ff_effect *old) 197 { 198 struct uinput_device *udev = input_get_drvdata(dev); 199 struct uinput_request request; 200 201 /* 202 * uinput driver does not currently support periodic effects with 203 * custom waveform since it does not have a way to pass buffer of 204 * samples (custom_data) to userspace. If ever there is a device 205 * supporting custom waveforms we would need to define an additional 206 * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out. 207 */ 208 if (effect->type == FF_PERIODIC && 209 effect->u.periodic.waveform == FF_CUSTOM) 210 return -EINVAL; 211 212 request.code = UI_FF_UPLOAD; 213 request.u.upload.effect = effect; 214 request.u.upload.old = old; 215 216 return uinput_request_submit(udev, &request); 217 } 218 219 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id) 220 { 221 struct uinput_device *udev = input_get_drvdata(dev); 222 struct uinput_request request; 223 224 if (!test_bit(EV_FF, dev->evbit)) 225 return -ENOSYS; 226 227 request.code = UI_FF_ERASE; 228 request.u.effect_id = effect_id; 229 230 return uinput_request_submit(udev, &request); 231 } 232 233 static void uinput_destroy_device(struct uinput_device *udev) 234 { 235 const char *name, *phys; 236 struct input_dev *dev = udev->dev; 237 enum uinput_state old_state = udev->state; 238 239 udev->state = UIST_NEW_DEVICE; 240 241 if (dev) { 242 name = dev->name; 243 phys = dev->phys; 244 if (old_state == UIST_CREATED) { 245 uinput_flush_requests(udev); 246 input_unregister_device(dev); 247 } else { 248 input_free_device(dev); 249 } 250 kfree(name); 251 kfree(phys); 252 udev->dev = NULL; 253 } 254 } 255 256 static int uinput_create_device(struct uinput_device *udev) 257 { 258 struct input_dev *dev = udev->dev; 259 int error; 260 261 if (udev->state != UIST_SETUP_COMPLETE) { 262 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME); 263 return -EINVAL; 264 } 265 266 if (udev->ff_effects_max) { 267 error = input_ff_create(dev, udev->ff_effects_max); 268 if (error) 269 goto fail1; 270 271 dev->ff->upload = uinput_dev_upload_effect; 272 dev->ff->erase = uinput_dev_erase_effect; 273 dev->ff->playback = uinput_dev_playback; 274 dev->ff->set_gain = uinput_dev_set_gain; 275 dev->ff->set_autocenter = uinput_dev_set_autocenter; 276 } 277 278 error = input_register_device(udev->dev); 279 if (error) 280 goto fail2; 281 282 udev->state = UIST_CREATED; 283 284 return 0; 285 286 fail2: input_ff_destroy(dev); 287 fail1: uinput_destroy_device(udev); 288 return error; 289 } 290 291 static int uinput_open(struct inode *inode, struct file *file) 292 { 293 struct uinput_device *newdev; 294 295 newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL); 296 if (!newdev) 297 return -ENOMEM; 298 299 mutex_init(&newdev->mutex); 300 spin_lock_init(&newdev->requests_lock); 301 init_waitqueue_head(&newdev->requests_waitq); 302 init_waitqueue_head(&newdev->waitq); 303 newdev->state = UIST_NEW_DEVICE; 304 305 file->private_data = newdev; 306 nonseekable_open(inode, file); 307 308 return 0; 309 } 310 311 static int uinput_validate_absbits(struct input_dev *dev) 312 { 313 unsigned int cnt; 314 int retval = 0; 315 316 for (cnt = 0; cnt < ABS_CNT; cnt++) { 317 int min, max; 318 if (!test_bit(cnt, dev->absbit)) 319 continue; 320 321 min = input_abs_get_min(dev, cnt); 322 max = input_abs_get_max(dev, cnt); 323 324 if ((min != 0 || max != 0) && max <= min) { 325 printk(KERN_DEBUG 326 "%s: invalid abs[%02x] min:%d max:%d\n", 327 UINPUT_NAME, cnt, 328 input_abs_get_min(dev, cnt), 329 input_abs_get_max(dev, cnt)); 330 retval = -EINVAL; 331 break; 332 } 333 334 if (input_abs_get_flat(dev, cnt) > 335 input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) { 336 printk(KERN_DEBUG 337 "%s: abs_flat #%02x out of range: %d " 338 "(min:%d/max:%d)\n", 339 UINPUT_NAME, cnt, 340 input_abs_get_flat(dev, cnt), 341 input_abs_get_min(dev, cnt), 342 input_abs_get_max(dev, cnt)); 343 retval = -EINVAL; 344 break; 345 } 346 } 347 return retval; 348 } 349 350 static int uinput_allocate_device(struct uinput_device *udev) 351 { 352 udev->dev = input_allocate_device(); 353 if (!udev->dev) 354 return -ENOMEM; 355 356 udev->dev->event = uinput_dev_event; 357 input_set_drvdata(udev->dev, udev); 358 359 return 0; 360 } 361 362 static int uinput_setup_device(struct uinput_device *udev, 363 const char __user *buffer, size_t count) 364 { 365 struct uinput_user_dev *user_dev; 366 struct input_dev *dev; 367 int i; 368 int retval; 369 370 if (count != sizeof(struct uinput_user_dev)) 371 return -EINVAL; 372 373 if (!udev->dev) { 374 retval = uinput_allocate_device(udev); 375 if (retval) 376 return retval; 377 } 378 379 dev = udev->dev; 380 381 user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev)); 382 if (IS_ERR(user_dev)) 383 return PTR_ERR(user_dev); 384 385 udev->ff_effects_max = user_dev->ff_effects_max; 386 387 /* Ensure name is filled in */ 388 if (!user_dev->name[0]) { 389 retval = -EINVAL; 390 goto exit; 391 } 392 393 kfree(dev->name); 394 dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE, 395 GFP_KERNEL); 396 if (!dev->name) { 397 retval = -ENOMEM; 398 goto exit; 399 } 400 401 dev->id.bustype = user_dev->id.bustype; 402 dev->id.vendor = user_dev->id.vendor; 403 dev->id.product = user_dev->id.product; 404 dev->id.version = user_dev->id.version; 405 406 for (i = 0; i < ABS_CNT; i++) { 407 input_abs_set_max(dev, i, user_dev->absmax[i]); 408 input_abs_set_min(dev, i, user_dev->absmin[i]); 409 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]); 410 input_abs_set_flat(dev, i, user_dev->absflat[i]); 411 } 412 413 /* check if absmin/absmax/absfuzz/absflat are filled as 414 * told in Documentation/input/input-programming.txt */ 415 if (test_bit(EV_ABS, dev->evbit)) { 416 retval = uinput_validate_absbits(dev); 417 if (retval < 0) 418 goto exit; 419 if (test_bit(ABS_MT_SLOT, dev->absbit)) { 420 int nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1; 421 input_mt_init_slots(dev, nslot, 0); 422 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { 423 input_set_events_per_packet(dev, 60); 424 } 425 } 426 427 udev->state = UIST_SETUP_COMPLETE; 428 retval = count; 429 430 exit: 431 kfree(user_dev); 432 return retval; 433 } 434 435 static ssize_t uinput_inject_events(struct uinput_device *udev, 436 const char __user *buffer, size_t count) 437 { 438 struct input_event ev; 439 size_t bytes = 0; 440 441 if (count != 0 && count < input_event_size()) 442 return -EINVAL; 443 444 while (bytes + input_event_size() <= count) { 445 /* 446 * Note that even if some events were fetched successfully 447 * we are still going to return EFAULT instead of partial 448 * count to let userspace know that it got it's buffers 449 * all wrong. 450 */ 451 if (input_event_from_user(buffer + bytes, &ev)) 452 return -EFAULT; 453 454 input_event(udev->dev, ev.type, ev.code, ev.value); 455 bytes += input_event_size(); 456 } 457 458 return bytes; 459 } 460 461 static ssize_t uinput_write(struct file *file, const char __user *buffer, 462 size_t count, loff_t *ppos) 463 { 464 struct uinput_device *udev = file->private_data; 465 int retval; 466 467 if (count == 0) 468 return 0; 469 470 retval = mutex_lock_interruptible(&udev->mutex); 471 if (retval) 472 return retval; 473 474 retval = udev->state == UIST_CREATED ? 475 uinput_inject_events(udev, buffer, count) : 476 uinput_setup_device(udev, buffer, count); 477 478 mutex_unlock(&udev->mutex); 479 480 return retval; 481 } 482 483 static bool uinput_fetch_next_event(struct uinput_device *udev, 484 struct input_event *event) 485 { 486 bool have_event; 487 488 spin_lock_irq(&udev->dev->event_lock); 489 490 have_event = udev->head != udev->tail; 491 if (have_event) { 492 *event = udev->buff[udev->tail]; 493 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE; 494 } 495 496 spin_unlock_irq(&udev->dev->event_lock); 497 498 return have_event; 499 } 500 501 static ssize_t uinput_events_to_user(struct uinput_device *udev, 502 char __user *buffer, size_t count) 503 { 504 struct input_event event; 505 size_t read = 0; 506 507 while (read + input_event_size() <= count && 508 uinput_fetch_next_event(udev, &event)) { 509 510 if (input_event_to_user(buffer + read, &event)) 511 return -EFAULT; 512 513 read += input_event_size(); 514 } 515 516 return read; 517 } 518 519 static ssize_t uinput_read(struct file *file, char __user *buffer, 520 size_t count, loff_t *ppos) 521 { 522 struct uinput_device *udev = file->private_data; 523 ssize_t retval; 524 525 if (count != 0 && count < input_event_size()) 526 return -EINVAL; 527 528 do { 529 retval = mutex_lock_interruptible(&udev->mutex); 530 if (retval) 531 return retval; 532 533 if (udev->state != UIST_CREATED) 534 retval = -ENODEV; 535 else if (udev->head == udev->tail && 536 (file->f_flags & O_NONBLOCK)) 537 retval = -EAGAIN; 538 else 539 retval = uinput_events_to_user(udev, buffer, count); 540 541 mutex_unlock(&udev->mutex); 542 543 if (retval || count == 0) 544 break; 545 546 if (!(file->f_flags & O_NONBLOCK)) 547 retval = wait_event_interruptible(udev->waitq, 548 udev->head != udev->tail || 549 udev->state != UIST_CREATED); 550 } while (retval == 0); 551 552 return retval; 553 } 554 555 static unsigned int uinput_poll(struct file *file, poll_table *wait) 556 { 557 struct uinput_device *udev = file->private_data; 558 559 poll_wait(file, &udev->waitq, wait); 560 561 if (udev->head != udev->tail) 562 return POLLIN | POLLRDNORM; 563 564 return 0; 565 } 566 567 static int uinput_release(struct inode *inode, struct file *file) 568 { 569 struct uinput_device *udev = file->private_data; 570 571 uinput_destroy_device(udev); 572 kfree(udev); 573 574 return 0; 575 } 576 577 #ifdef CONFIG_COMPAT 578 struct uinput_ff_upload_compat { 579 __u32 request_id; 580 __s32 retval; 581 struct ff_effect_compat effect; 582 struct ff_effect_compat old; 583 }; 584 585 static int uinput_ff_upload_to_user(char __user *buffer, 586 const struct uinput_ff_upload *ff_up) 587 { 588 if (INPUT_COMPAT_TEST) { 589 struct uinput_ff_upload_compat ff_up_compat; 590 591 ff_up_compat.request_id = ff_up->request_id; 592 ff_up_compat.retval = ff_up->retval; 593 /* 594 * It so happens that the pointer that gives us the trouble 595 * is the last field in the structure. Since we don't support 596 * custom waveforms in uinput anyway we can just copy the whole 597 * thing (to the compat size) and ignore the pointer. 598 */ 599 memcpy(&ff_up_compat.effect, &ff_up->effect, 600 sizeof(struct ff_effect_compat)); 601 memcpy(&ff_up_compat.old, &ff_up->old, 602 sizeof(struct ff_effect_compat)); 603 604 if (copy_to_user(buffer, &ff_up_compat, 605 sizeof(struct uinput_ff_upload_compat))) 606 return -EFAULT; 607 } else { 608 if (copy_to_user(buffer, ff_up, 609 sizeof(struct uinput_ff_upload))) 610 return -EFAULT; 611 } 612 613 return 0; 614 } 615 616 static int uinput_ff_upload_from_user(const char __user *buffer, 617 struct uinput_ff_upload *ff_up) 618 { 619 if (INPUT_COMPAT_TEST) { 620 struct uinput_ff_upload_compat ff_up_compat; 621 622 if (copy_from_user(&ff_up_compat, buffer, 623 sizeof(struct uinput_ff_upload_compat))) 624 return -EFAULT; 625 626 ff_up->request_id = ff_up_compat.request_id; 627 ff_up->retval = ff_up_compat.retval; 628 memcpy(&ff_up->effect, &ff_up_compat.effect, 629 sizeof(struct ff_effect_compat)); 630 memcpy(&ff_up->old, &ff_up_compat.old, 631 sizeof(struct ff_effect_compat)); 632 633 } else { 634 if (copy_from_user(ff_up, buffer, 635 sizeof(struct uinput_ff_upload))) 636 return -EFAULT; 637 } 638 639 return 0; 640 } 641 642 #else 643 644 static int uinput_ff_upload_to_user(char __user *buffer, 645 const struct uinput_ff_upload *ff_up) 646 { 647 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload))) 648 return -EFAULT; 649 650 return 0; 651 } 652 653 static int uinput_ff_upload_from_user(const char __user *buffer, 654 struct uinput_ff_upload *ff_up) 655 { 656 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload))) 657 return -EFAULT; 658 659 return 0; 660 } 661 662 #endif 663 664 #define uinput_set_bit(_arg, _bit, _max) \ 665 ({ \ 666 int __ret = 0; \ 667 if (udev->state == UIST_CREATED) \ 668 __ret = -EINVAL; \ 669 else if ((_arg) > (_max)) \ 670 __ret = -EINVAL; \ 671 else set_bit((_arg), udev->dev->_bit); \ 672 __ret; \ 673 }) 674 675 static int uinput_str_to_user(void __user *dest, const char *str, 676 unsigned int maxlen) 677 { 678 char __user *p = dest; 679 int len, ret; 680 681 if (!str) 682 return -ENOENT; 683 684 if (maxlen == 0) 685 return -EINVAL; 686 687 len = strlen(str) + 1; 688 if (len > maxlen) 689 len = maxlen; 690 691 ret = copy_to_user(p, str, len); 692 if (ret) 693 return -EFAULT; 694 695 /* force terminating '\0' */ 696 ret = put_user(0, p + len - 1); 697 return ret ? -EFAULT : len; 698 } 699 700 static long uinput_ioctl_handler(struct file *file, unsigned int cmd, 701 unsigned long arg, void __user *p) 702 { 703 int retval; 704 struct uinput_device *udev = file->private_data; 705 struct uinput_ff_upload ff_up; 706 struct uinput_ff_erase ff_erase; 707 struct uinput_request *req; 708 char *phys; 709 const char *name; 710 unsigned int size; 711 712 retval = mutex_lock_interruptible(&udev->mutex); 713 if (retval) 714 return retval; 715 716 if (!udev->dev) { 717 retval = uinput_allocate_device(udev); 718 if (retval) 719 goto out; 720 } 721 722 switch (cmd) { 723 case UI_DEV_CREATE: 724 retval = uinput_create_device(udev); 725 goto out; 726 727 case UI_DEV_DESTROY: 728 uinput_destroy_device(udev); 729 goto out; 730 731 case UI_SET_EVBIT: 732 retval = uinput_set_bit(arg, evbit, EV_MAX); 733 goto out; 734 735 case UI_SET_KEYBIT: 736 retval = uinput_set_bit(arg, keybit, KEY_MAX); 737 goto out; 738 739 case UI_SET_RELBIT: 740 retval = uinput_set_bit(arg, relbit, REL_MAX); 741 goto out; 742 743 case UI_SET_ABSBIT: 744 retval = uinput_set_bit(arg, absbit, ABS_MAX); 745 goto out; 746 747 case UI_SET_MSCBIT: 748 retval = uinput_set_bit(arg, mscbit, MSC_MAX); 749 goto out; 750 751 case UI_SET_LEDBIT: 752 retval = uinput_set_bit(arg, ledbit, LED_MAX); 753 goto out; 754 755 case UI_SET_SNDBIT: 756 retval = uinput_set_bit(arg, sndbit, SND_MAX); 757 goto out; 758 759 case UI_SET_FFBIT: 760 retval = uinput_set_bit(arg, ffbit, FF_MAX); 761 goto out; 762 763 case UI_SET_SWBIT: 764 retval = uinput_set_bit(arg, swbit, SW_MAX); 765 goto out; 766 767 case UI_SET_PROPBIT: 768 retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX); 769 goto out; 770 771 case UI_SET_PHYS: 772 if (udev->state == UIST_CREATED) { 773 retval = -EINVAL; 774 goto out; 775 } 776 777 phys = strndup_user(p, 1024); 778 if (IS_ERR(phys)) { 779 retval = PTR_ERR(phys); 780 goto out; 781 } 782 783 kfree(udev->dev->phys); 784 udev->dev->phys = phys; 785 goto out; 786 787 case UI_BEGIN_FF_UPLOAD: 788 retval = uinput_ff_upload_from_user(p, &ff_up); 789 if (retval) 790 goto out; 791 792 req = uinput_request_find(udev, ff_up.request_id); 793 if (!req || req->code != UI_FF_UPLOAD || 794 !req->u.upload.effect) { 795 retval = -EINVAL; 796 goto out; 797 } 798 799 ff_up.retval = 0; 800 ff_up.effect = *req->u.upload.effect; 801 if (req->u.upload.old) 802 ff_up.old = *req->u.upload.old; 803 else 804 memset(&ff_up.old, 0, sizeof(struct ff_effect)); 805 806 retval = uinput_ff_upload_to_user(p, &ff_up); 807 goto out; 808 809 case UI_BEGIN_FF_ERASE: 810 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { 811 retval = -EFAULT; 812 goto out; 813 } 814 815 req = uinput_request_find(udev, ff_erase.request_id); 816 if (!req || req->code != UI_FF_ERASE) { 817 retval = -EINVAL; 818 goto out; 819 } 820 821 ff_erase.retval = 0; 822 ff_erase.effect_id = req->u.effect_id; 823 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) { 824 retval = -EFAULT; 825 goto out; 826 } 827 828 goto out; 829 830 case UI_END_FF_UPLOAD: 831 retval = uinput_ff_upload_from_user(p, &ff_up); 832 if (retval) 833 goto out; 834 835 req = uinput_request_find(udev, ff_up.request_id); 836 if (!req || req->code != UI_FF_UPLOAD || 837 !req->u.upload.effect) { 838 retval = -EINVAL; 839 goto out; 840 } 841 842 req->retval = ff_up.retval; 843 uinput_request_done(udev, req); 844 goto out; 845 846 case UI_END_FF_ERASE: 847 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { 848 retval = -EFAULT; 849 goto out; 850 } 851 852 req = uinput_request_find(udev, ff_erase.request_id); 853 if (!req || req->code != UI_FF_ERASE) { 854 retval = -EINVAL; 855 goto out; 856 } 857 858 req->retval = ff_erase.retval; 859 uinput_request_done(udev, req); 860 goto out; 861 } 862 863 size = _IOC_SIZE(cmd); 864 865 /* Now check variable-length commands */ 866 switch (cmd & ~IOCSIZE_MASK) { 867 case UI_GET_SYSNAME(0): 868 if (udev->state != UIST_CREATED) { 869 retval = -ENOENT; 870 goto out; 871 } 872 name = dev_name(&udev->dev->dev); 873 retval = uinput_str_to_user(p, name, size); 874 goto out; 875 } 876 877 retval = -EINVAL; 878 out: 879 mutex_unlock(&udev->mutex); 880 return retval; 881 } 882 883 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 884 { 885 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg); 886 } 887 888 #ifdef CONFIG_COMPAT 889 static long uinput_compat_ioctl(struct file *file, 890 unsigned int cmd, unsigned long arg) 891 { 892 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg)); 893 } 894 #endif 895 896 static const struct file_operations uinput_fops = { 897 .owner = THIS_MODULE, 898 .open = uinput_open, 899 .release = uinput_release, 900 .read = uinput_read, 901 .write = uinput_write, 902 .poll = uinput_poll, 903 .unlocked_ioctl = uinput_ioctl, 904 #ifdef CONFIG_COMPAT 905 .compat_ioctl = uinput_compat_ioctl, 906 #endif 907 .llseek = no_llseek, 908 }; 909 910 static struct miscdevice uinput_misc = { 911 .fops = &uinput_fops, 912 .minor = UINPUT_MINOR, 913 .name = UINPUT_NAME, 914 }; 915 MODULE_ALIAS_MISCDEV(UINPUT_MINOR); 916 MODULE_ALIAS("devname:" UINPUT_NAME); 917 918 static int __init uinput_init(void) 919 { 920 return misc_register(&uinput_misc); 921 } 922 923 static void __exit uinput_exit(void) 924 { 925 misc_deregister(&uinput_misc); 926 } 927 928 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho"); 929 MODULE_DESCRIPTION("User level driver support for input subsystem"); 930 MODULE_LICENSE("GPL"); 931 MODULE_VERSION("0.3"); 932 933 module_init(uinput_init); 934 module_exit(uinput_exit); 935