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 nslot; 315 316 if (!test_bit(EV_ABS, dev->evbit)) 317 return 0; 318 319 /* 320 * Check if absmin/absmax/absfuzz/absflat are sane. 321 */ 322 323 for_each_set_bit(cnt, dev->absbit, ABS_CNT) { 324 int min, max; 325 326 min = input_abs_get_min(dev, cnt); 327 max = input_abs_get_max(dev, cnt); 328 329 if ((min != 0 || max != 0) && max <= min) { 330 printk(KERN_DEBUG 331 "%s: invalid abs[%02x] min:%d max:%d\n", 332 UINPUT_NAME, cnt, 333 input_abs_get_min(dev, cnt), 334 input_abs_get_max(dev, cnt)); 335 return -EINVAL; 336 } 337 338 if (input_abs_get_flat(dev, cnt) > 339 input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) { 340 printk(KERN_DEBUG 341 "%s: abs_flat #%02x out of range: %d " 342 "(min:%d/max:%d)\n", 343 UINPUT_NAME, cnt, 344 input_abs_get_flat(dev, cnt), 345 input_abs_get_min(dev, cnt), 346 input_abs_get_max(dev, cnt)); 347 return -EINVAL; 348 } 349 } 350 351 if (test_bit(ABS_MT_SLOT, dev->absbit)) { 352 nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1; 353 input_mt_init_slots(dev, nslot, 0); 354 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { 355 input_set_events_per_packet(dev, 60); 356 } 357 358 return 0; 359 } 360 361 static int uinput_allocate_device(struct uinput_device *udev) 362 { 363 udev->dev = input_allocate_device(); 364 if (!udev->dev) 365 return -ENOMEM; 366 367 udev->dev->event = uinput_dev_event; 368 input_set_drvdata(udev->dev, udev); 369 370 return 0; 371 } 372 373 static int uinput_setup_device(struct uinput_device *udev, 374 const char __user *buffer, size_t count) 375 { 376 struct uinput_user_dev *user_dev; 377 struct input_dev *dev; 378 int i; 379 int retval; 380 381 if (count != sizeof(struct uinput_user_dev)) 382 return -EINVAL; 383 384 if (!udev->dev) { 385 retval = uinput_allocate_device(udev); 386 if (retval) 387 return retval; 388 } 389 390 dev = udev->dev; 391 392 user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev)); 393 if (IS_ERR(user_dev)) 394 return PTR_ERR(user_dev); 395 396 udev->ff_effects_max = user_dev->ff_effects_max; 397 398 /* Ensure name is filled in */ 399 if (!user_dev->name[0]) { 400 retval = -EINVAL; 401 goto exit; 402 } 403 404 kfree(dev->name); 405 dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE, 406 GFP_KERNEL); 407 if (!dev->name) { 408 retval = -ENOMEM; 409 goto exit; 410 } 411 412 dev->id.bustype = user_dev->id.bustype; 413 dev->id.vendor = user_dev->id.vendor; 414 dev->id.product = user_dev->id.product; 415 dev->id.version = user_dev->id.version; 416 417 for (i = 0; i < ABS_CNT; i++) { 418 input_abs_set_max(dev, i, user_dev->absmax[i]); 419 input_abs_set_min(dev, i, user_dev->absmin[i]); 420 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]); 421 input_abs_set_flat(dev, i, user_dev->absflat[i]); 422 } 423 424 retval = uinput_validate_absbits(dev); 425 if (retval < 0) 426 goto exit; 427 428 udev->state = UIST_SETUP_COMPLETE; 429 retval = count; 430 431 exit: 432 kfree(user_dev); 433 return retval; 434 } 435 436 static ssize_t uinput_inject_events(struct uinput_device *udev, 437 const char __user *buffer, size_t count) 438 { 439 struct input_event ev; 440 size_t bytes = 0; 441 442 if (count != 0 && count < input_event_size()) 443 return -EINVAL; 444 445 while (bytes + input_event_size() <= count) { 446 /* 447 * Note that even if some events were fetched successfully 448 * we are still going to return EFAULT instead of partial 449 * count to let userspace know that it got it's buffers 450 * all wrong. 451 */ 452 if (input_event_from_user(buffer + bytes, &ev)) 453 return -EFAULT; 454 455 input_event(udev->dev, ev.type, ev.code, ev.value); 456 bytes += input_event_size(); 457 } 458 459 return bytes; 460 } 461 462 static ssize_t uinput_write(struct file *file, const char __user *buffer, 463 size_t count, loff_t *ppos) 464 { 465 struct uinput_device *udev = file->private_data; 466 int retval; 467 468 if (count == 0) 469 return 0; 470 471 retval = mutex_lock_interruptible(&udev->mutex); 472 if (retval) 473 return retval; 474 475 retval = udev->state == UIST_CREATED ? 476 uinput_inject_events(udev, buffer, count) : 477 uinput_setup_device(udev, buffer, count); 478 479 mutex_unlock(&udev->mutex); 480 481 return retval; 482 } 483 484 static bool uinput_fetch_next_event(struct uinput_device *udev, 485 struct input_event *event) 486 { 487 bool have_event; 488 489 spin_lock_irq(&udev->dev->event_lock); 490 491 have_event = udev->head != udev->tail; 492 if (have_event) { 493 *event = udev->buff[udev->tail]; 494 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE; 495 } 496 497 spin_unlock_irq(&udev->dev->event_lock); 498 499 return have_event; 500 } 501 502 static ssize_t uinput_events_to_user(struct uinput_device *udev, 503 char __user *buffer, size_t count) 504 { 505 struct input_event event; 506 size_t read = 0; 507 508 while (read + input_event_size() <= count && 509 uinput_fetch_next_event(udev, &event)) { 510 511 if (input_event_to_user(buffer + read, &event)) 512 return -EFAULT; 513 514 read += input_event_size(); 515 } 516 517 return read; 518 } 519 520 static ssize_t uinput_read(struct file *file, char __user *buffer, 521 size_t count, loff_t *ppos) 522 { 523 struct uinput_device *udev = file->private_data; 524 ssize_t retval; 525 526 if (count != 0 && count < input_event_size()) 527 return -EINVAL; 528 529 do { 530 retval = mutex_lock_interruptible(&udev->mutex); 531 if (retval) 532 return retval; 533 534 if (udev->state != UIST_CREATED) 535 retval = -ENODEV; 536 else if (udev->head == udev->tail && 537 (file->f_flags & O_NONBLOCK)) 538 retval = -EAGAIN; 539 else 540 retval = uinput_events_to_user(udev, buffer, count); 541 542 mutex_unlock(&udev->mutex); 543 544 if (retval || count == 0) 545 break; 546 547 if (!(file->f_flags & O_NONBLOCK)) 548 retval = wait_event_interruptible(udev->waitq, 549 udev->head != udev->tail || 550 udev->state != UIST_CREATED); 551 } while (retval == 0); 552 553 return retval; 554 } 555 556 static unsigned int uinput_poll(struct file *file, poll_table *wait) 557 { 558 struct uinput_device *udev = file->private_data; 559 560 poll_wait(file, &udev->waitq, wait); 561 562 if (udev->head != udev->tail) 563 return POLLIN | POLLRDNORM; 564 565 return 0; 566 } 567 568 static int uinput_release(struct inode *inode, struct file *file) 569 { 570 struct uinput_device *udev = file->private_data; 571 572 uinput_destroy_device(udev); 573 kfree(udev); 574 575 return 0; 576 } 577 578 #ifdef CONFIG_COMPAT 579 struct uinput_ff_upload_compat { 580 __u32 request_id; 581 __s32 retval; 582 struct ff_effect_compat effect; 583 struct ff_effect_compat old; 584 }; 585 586 static int uinput_ff_upload_to_user(char __user *buffer, 587 const struct uinput_ff_upload *ff_up) 588 { 589 if (INPUT_COMPAT_TEST) { 590 struct uinput_ff_upload_compat ff_up_compat; 591 592 ff_up_compat.request_id = ff_up->request_id; 593 ff_up_compat.retval = ff_up->retval; 594 /* 595 * It so happens that the pointer that gives us the trouble 596 * is the last field in the structure. Since we don't support 597 * custom waveforms in uinput anyway we can just copy the whole 598 * thing (to the compat size) and ignore the pointer. 599 */ 600 memcpy(&ff_up_compat.effect, &ff_up->effect, 601 sizeof(struct ff_effect_compat)); 602 memcpy(&ff_up_compat.old, &ff_up->old, 603 sizeof(struct ff_effect_compat)); 604 605 if (copy_to_user(buffer, &ff_up_compat, 606 sizeof(struct uinput_ff_upload_compat))) 607 return -EFAULT; 608 } else { 609 if (copy_to_user(buffer, ff_up, 610 sizeof(struct uinput_ff_upload))) 611 return -EFAULT; 612 } 613 614 return 0; 615 } 616 617 static int uinput_ff_upload_from_user(const char __user *buffer, 618 struct uinput_ff_upload *ff_up) 619 { 620 if (INPUT_COMPAT_TEST) { 621 struct uinput_ff_upload_compat ff_up_compat; 622 623 if (copy_from_user(&ff_up_compat, buffer, 624 sizeof(struct uinput_ff_upload_compat))) 625 return -EFAULT; 626 627 ff_up->request_id = ff_up_compat.request_id; 628 ff_up->retval = ff_up_compat.retval; 629 memcpy(&ff_up->effect, &ff_up_compat.effect, 630 sizeof(struct ff_effect_compat)); 631 memcpy(&ff_up->old, &ff_up_compat.old, 632 sizeof(struct ff_effect_compat)); 633 634 } else { 635 if (copy_from_user(ff_up, buffer, 636 sizeof(struct uinput_ff_upload))) 637 return -EFAULT; 638 } 639 640 return 0; 641 } 642 643 #else 644 645 static int uinput_ff_upload_to_user(char __user *buffer, 646 const struct uinput_ff_upload *ff_up) 647 { 648 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload))) 649 return -EFAULT; 650 651 return 0; 652 } 653 654 static int uinput_ff_upload_from_user(const char __user *buffer, 655 struct uinput_ff_upload *ff_up) 656 { 657 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload))) 658 return -EFAULT; 659 660 return 0; 661 } 662 663 #endif 664 665 #define uinput_set_bit(_arg, _bit, _max) \ 666 ({ \ 667 int __ret = 0; \ 668 if (udev->state == UIST_CREATED) \ 669 __ret = -EINVAL; \ 670 else if ((_arg) > (_max)) \ 671 __ret = -EINVAL; \ 672 else set_bit((_arg), udev->dev->_bit); \ 673 __ret; \ 674 }) 675 676 static int uinput_str_to_user(void __user *dest, const char *str, 677 unsigned int maxlen) 678 { 679 char __user *p = dest; 680 int len, ret; 681 682 if (!str) 683 return -ENOENT; 684 685 if (maxlen == 0) 686 return -EINVAL; 687 688 len = strlen(str) + 1; 689 if (len > maxlen) 690 len = maxlen; 691 692 ret = copy_to_user(p, str, len); 693 if (ret) 694 return -EFAULT; 695 696 /* force terminating '\0' */ 697 ret = put_user(0, p + len - 1); 698 return ret ? -EFAULT : len; 699 } 700 701 static long uinput_ioctl_handler(struct file *file, unsigned int cmd, 702 unsigned long arg, void __user *p) 703 { 704 int retval; 705 struct uinput_device *udev = file->private_data; 706 struct uinput_ff_upload ff_up; 707 struct uinput_ff_erase ff_erase; 708 struct uinput_request *req; 709 char *phys; 710 const char *name; 711 unsigned int size; 712 713 retval = mutex_lock_interruptible(&udev->mutex); 714 if (retval) 715 return retval; 716 717 if (!udev->dev) { 718 retval = uinput_allocate_device(udev); 719 if (retval) 720 goto out; 721 } 722 723 switch (cmd) { 724 case UI_GET_VERSION: 725 if (put_user(UINPUT_VERSION, 726 (unsigned int __user *)p)) 727 retval = -EFAULT; 728 goto out; 729 730 case UI_DEV_CREATE: 731 retval = uinput_create_device(udev); 732 goto out; 733 734 case UI_DEV_DESTROY: 735 uinput_destroy_device(udev); 736 goto out; 737 738 case UI_SET_EVBIT: 739 retval = uinput_set_bit(arg, evbit, EV_MAX); 740 goto out; 741 742 case UI_SET_KEYBIT: 743 retval = uinput_set_bit(arg, keybit, KEY_MAX); 744 goto out; 745 746 case UI_SET_RELBIT: 747 retval = uinput_set_bit(arg, relbit, REL_MAX); 748 goto out; 749 750 case UI_SET_ABSBIT: 751 retval = uinput_set_bit(arg, absbit, ABS_MAX); 752 goto out; 753 754 case UI_SET_MSCBIT: 755 retval = uinput_set_bit(arg, mscbit, MSC_MAX); 756 goto out; 757 758 case UI_SET_LEDBIT: 759 retval = uinput_set_bit(arg, ledbit, LED_MAX); 760 goto out; 761 762 case UI_SET_SNDBIT: 763 retval = uinput_set_bit(arg, sndbit, SND_MAX); 764 goto out; 765 766 case UI_SET_FFBIT: 767 retval = uinput_set_bit(arg, ffbit, FF_MAX); 768 goto out; 769 770 case UI_SET_SWBIT: 771 retval = uinput_set_bit(arg, swbit, SW_MAX); 772 goto out; 773 774 case UI_SET_PROPBIT: 775 retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX); 776 goto out; 777 778 case UI_SET_PHYS: 779 if (udev->state == UIST_CREATED) { 780 retval = -EINVAL; 781 goto out; 782 } 783 784 phys = strndup_user(p, 1024); 785 if (IS_ERR(phys)) { 786 retval = PTR_ERR(phys); 787 goto out; 788 } 789 790 kfree(udev->dev->phys); 791 udev->dev->phys = phys; 792 goto out; 793 794 case UI_BEGIN_FF_UPLOAD: 795 retval = uinput_ff_upload_from_user(p, &ff_up); 796 if (retval) 797 goto out; 798 799 req = uinput_request_find(udev, ff_up.request_id); 800 if (!req || req->code != UI_FF_UPLOAD || 801 !req->u.upload.effect) { 802 retval = -EINVAL; 803 goto out; 804 } 805 806 ff_up.retval = 0; 807 ff_up.effect = *req->u.upload.effect; 808 if (req->u.upload.old) 809 ff_up.old = *req->u.upload.old; 810 else 811 memset(&ff_up.old, 0, sizeof(struct ff_effect)); 812 813 retval = uinput_ff_upload_to_user(p, &ff_up); 814 goto out; 815 816 case UI_BEGIN_FF_ERASE: 817 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { 818 retval = -EFAULT; 819 goto out; 820 } 821 822 req = uinput_request_find(udev, ff_erase.request_id); 823 if (!req || req->code != UI_FF_ERASE) { 824 retval = -EINVAL; 825 goto out; 826 } 827 828 ff_erase.retval = 0; 829 ff_erase.effect_id = req->u.effect_id; 830 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) { 831 retval = -EFAULT; 832 goto out; 833 } 834 835 goto out; 836 837 case UI_END_FF_UPLOAD: 838 retval = uinput_ff_upload_from_user(p, &ff_up); 839 if (retval) 840 goto out; 841 842 req = uinput_request_find(udev, ff_up.request_id); 843 if (!req || req->code != UI_FF_UPLOAD || 844 !req->u.upload.effect) { 845 retval = -EINVAL; 846 goto out; 847 } 848 849 req->retval = ff_up.retval; 850 uinput_request_done(udev, req); 851 goto out; 852 853 case UI_END_FF_ERASE: 854 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { 855 retval = -EFAULT; 856 goto out; 857 } 858 859 req = uinput_request_find(udev, ff_erase.request_id); 860 if (!req || req->code != UI_FF_ERASE) { 861 retval = -EINVAL; 862 goto out; 863 } 864 865 req->retval = ff_erase.retval; 866 uinput_request_done(udev, req); 867 goto out; 868 } 869 870 size = _IOC_SIZE(cmd); 871 872 /* Now check variable-length commands */ 873 switch (cmd & ~IOCSIZE_MASK) { 874 case UI_GET_SYSNAME(0): 875 if (udev->state != UIST_CREATED) { 876 retval = -ENOENT; 877 goto out; 878 } 879 name = dev_name(&udev->dev->dev); 880 retval = uinput_str_to_user(p, name, size); 881 goto out; 882 } 883 884 retval = -EINVAL; 885 out: 886 mutex_unlock(&udev->mutex); 887 return retval; 888 } 889 890 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 891 { 892 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg); 893 } 894 895 #ifdef CONFIG_COMPAT 896 static long uinput_compat_ioctl(struct file *file, 897 unsigned int cmd, unsigned long arg) 898 { 899 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg)); 900 } 901 #endif 902 903 static const struct file_operations uinput_fops = { 904 .owner = THIS_MODULE, 905 .open = uinput_open, 906 .release = uinput_release, 907 .read = uinput_read, 908 .write = uinput_write, 909 .poll = uinput_poll, 910 .unlocked_ioctl = uinput_ioctl, 911 #ifdef CONFIG_COMPAT 912 .compat_ioctl = uinput_compat_ioctl, 913 #endif 914 .llseek = no_llseek, 915 }; 916 917 static struct miscdevice uinput_misc = { 918 .fops = &uinput_fops, 919 .minor = UINPUT_MINOR, 920 .name = UINPUT_NAME, 921 }; 922 MODULE_ALIAS_MISCDEV(UINPUT_MINOR); 923 MODULE_ALIAS("devname:" UINPUT_NAME); 924 925 static int __init uinput_init(void) 926 { 927 return misc_register(&uinput_misc); 928 } 929 930 static void __exit uinput_exit(void) 931 { 932 misc_deregister(&uinput_misc); 933 } 934 935 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho"); 936 MODULE_DESCRIPTION("User level driver support for input subsystem"); 937 MODULE_LICENSE("GPL"); 938 MODULE_VERSION("0.3"); 939 940 module_init(uinput_init); 941 module_exit(uinput_exit); 942