drivers/input/misc/uinput.c

   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/smp_lock.h>
  38 #include <linux/fs.h>
  39 #include <linux/miscdevice.h>
  40 #include <linux/uinput.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         lock_kernel();
 288         mutex_init(&newdev->mutex);
 289         spin_lock_init(&newdev->requests_lock);
 290         init_waitqueue_head(&newdev->requests_waitq);
 291         init_waitqueue_head(&newdev->waitq);
 292         newdev->state = UIST_NEW_DEVICE;
 293
 294         file->private_data = newdev;
 295         unlock_kernel();
 296
 297         return 0;
 298 }
 299
 300 static int uinput_validate_absbits(struct input_dev *dev)
 301 {
 302         unsigned int cnt;
 303         int retval = 0;
 304
 305         for (cnt = 0; cnt < ABS_MAX + 1; cnt++) {
 306                 if (!test_bit(cnt, dev->absbit))
 307                         continue;
 308
 309                 if ((dev->absmax[cnt] <= dev->absmin[cnt])) {
 310                         printk(KERN_DEBUG
 311                                 "%s: invalid abs[%02x] min:%d max:%d\n",
 312                                 UINPUT_NAME, cnt,
 313                                 dev->absmin[cnt], dev->absmax[cnt]);
 314                         retval = -EINVAL;
 315                         break;
 316                 }
 317
 318                 if (dev->absflat[cnt] > (dev->absmax[cnt] - dev->absmin[cnt])) {
 319                         printk(KERN_DEBUG
 320                                 "%s: absflat[%02x] out of range: %d "
 321                                 "(min:%d/max:%d)\n",
 322                                 UINPUT_NAME, cnt, dev->absflat[cnt],
 323                                 dev->absmin[cnt], dev->absmax[cnt]);
 324                         retval = -EINVAL;
 325                         break;
 326                 }
 327         }
 328         return retval;
 329 }
 330
 331 static int uinput_allocate_device(struct uinput_device *udev)
 332 {
 333         udev->dev = input_allocate_device();
 334         if (!udev->dev)
 335                 return -ENOMEM;
 336
 337         udev->dev->event = uinput_dev_event;
 338         input_set_drvdata(udev->dev, udev);
 339
 340         return 0;
 341 }
 342
 343 static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count)
 344 {
 345         struct uinput_user_dev  *user_dev;
 346         struct input_dev        *dev;
 347         char                    *name;
 348         int                     size;
 349         int                     retval;
 350
 351         if (count != sizeof(struct uinput_user_dev))
 352                 return -EINVAL;
 353
 354         if (!udev->dev) {
 355                 retval = uinput_allocate_device(udev);
 356                 if (retval)
 357                         return retval;
 358         }
 359
 360         dev = udev->dev;
 361
 362         user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL);
 363         if (!user_dev)
 364                 return -ENOMEM;
 365
 366         if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) {
 367                 retval = -EFAULT;
 368                 goto exit;
 369         }
 370
 371         udev->ff_effects_max = user_dev->ff_effects_max;
 372
 373         size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1;
 374         if (!size) {
 375                 retval = -EINVAL;
 376                 goto exit;
 377         }
 378
 379         kfree(dev->name);
 380         dev->name = name = kmalloc(size, GFP_KERNEL);
 381         if (!name) {
 382                 retval = -ENOMEM;
 383                 goto exit;
 384         }
 385         strlcpy(name, user_dev->name, size);
 386
 387         dev->id.bustype = user_dev->id.bustype;
 388         dev->id.vendor  = user_dev->id.vendor;
 389         dev->id.product = user_dev->id.product;
 390         dev->id.version = user_dev->id.version;
 391
 392         size = sizeof(int) * (ABS_MAX + 1);
 393         memcpy(dev->absmax, user_dev->absmax, size);
 394         memcpy(dev->absmin, user_dev->absmin, size);
 395         memcpy(dev->absfuzz, user_dev->absfuzz, size);
 396         memcpy(dev->absflat, user_dev->absflat, size);
 397
 398         /* check if absmin/absmax/absfuzz/absflat are filled as
 399          * told in Documentation/input/input-programming.txt */
 400         if (test_bit(EV_ABS, dev->evbit)) {
 401                 retval = uinput_validate_absbits(dev);
 402                 if (retval < 0)
 403                         goto exit;
 404         }
 405
 406         udev->state = UIST_SETUP_COMPLETE;
 407         retval = count;
 408
 409  exit:
 410         kfree(user_dev);
 411         return retval;
 412 }
 413
 414 static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count)
 415 {
 416         struct input_event ev;
 417
 418         if (count < input_event_size())
 419                 return -EINVAL;
 420
 421         if (input_event_from_user(buffer, &ev))
 422                 return -EFAULT;
 423
 424         input_event(udev->dev, ev.type, ev.code, ev.value);
 425
 426         return input_event_size();
 427 }
 428
 429 static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 430 {
 431         struct uinput_device *udev = file->private_data;
 432         int retval;
 433
 434         retval = mutex_lock_interruptible(&udev->mutex);
 435         if (retval)
 436                 return retval;
 437
 438         retval = udev->state == UIST_CREATED ?
 439                         uinput_inject_event(udev, buffer, count) :
 440                         uinput_setup_device(udev, buffer, count);
 441
 442         mutex_unlock(&udev->mutex);
 443
 444         return retval;
 445 }
 446
 447 static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 448 {
 449         struct uinput_device *udev = file->private_data;
 450         int retval = 0;
 451
 452         if (udev->state != UIST_CREATED)
 453                 return -ENODEV;
 454
 455         if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
 456                 return -EAGAIN;
 457
 458         retval = wait_event_interruptible(udev->waitq,
 459                         udev->head != udev->tail || udev->state != UIST_CREATED);
 460         if (retval)
 461                 return retval;
 462
 463         retval = mutex_lock_interruptible(&udev->mutex);
 464         if (retval)
 465                 return retval;
 466
 467         if (udev->state != UIST_CREATED) {
 468                 retval = -ENODEV;
 469                 goto out;
 470         }
 471
 472         while (udev->head != udev->tail && retval + input_event_size() <= count) {
 473                 if (input_event_to_user(buffer + retval, &udev->buff[udev->tail])) {
 474                         retval = -EFAULT;
 475                         goto out;
 476                 }
 477                 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
 478                 retval += input_event_size();
 479         }
 480
 481  out:
 482         mutex_unlock(&udev->mutex);
 483
 484         return retval;
 485 }
 486
 487 static unsigned int uinput_poll(struct file *file, poll_table *wait)
 488 {
 489         struct uinput_device *udev = file->private_data;
 490
 491         poll_wait(file, &udev->waitq, wait);
 492
 493         if (udev->head != udev->tail)
 494                 return POLLIN | POLLRDNORM;
 495
 496         return 0;
 497 }
 498
 499 static int uinput_release(struct inode *inode, struct file *file)
 500 {
 501         struct uinput_device *udev = file->private_data;
 502
 503         uinput_destroy_device(udev);
 504         kfree(udev);
 505
 506         return 0;
 507 }
 508
 509 #ifdef CONFIG_COMPAT
 510 struct uinput_ff_upload_compat {
 511         int                     request_id;
 512         int                     retval;
 513         struct ff_effect_compat effect;
 514         struct ff_effect_compat old;
 515 };
 516
 517 static int uinput_ff_upload_to_user(char __user *buffer,
 518                                     const struct uinput_ff_upload *ff_up)
 519 {
 520         if (INPUT_COMPAT_TEST) {
 521                 struct uinput_ff_upload_compat ff_up_compat;
 522
 523                 ff_up_compat.request_id = ff_up->request_id;
 524                 ff_up_compat.retval = ff_up->retval;
 525                 /*
 526                  * It so happens that the pointer that gives us the trouble
 527                  * is the last field in the structure. Since we don't support
 528                  * custom waveforms in uinput anyway we can just copy the whole
 529                  * thing (to the compat size) and ignore the pointer.
 530                  */
 531                 memcpy(&ff_up_compat.effect, &ff_up->effect,
 532                         sizeof(struct ff_effect_compat));
 533                 memcpy(&ff_up_compat.old, &ff_up->old,
 534                         sizeof(struct ff_effect_compat));
 535
 536                 if (copy_to_user(buffer, &ff_up_compat,
 537                                  sizeof(struct uinput_ff_upload_compat)))
 538                         return -EFAULT;
 539         } else {
 540                 if (copy_to_user(buffer, ff_up,
 541                                  sizeof(struct uinput_ff_upload)))
 542                         return -EFAULT;
 543         }
 544
 545         return 0;
 546 }
 547
 548 static int uinput_ff_upload_from_user(const char __user *buffer,
 549                                       struct uinput_ff_upload *ff_up)
 550 {
 551         if (INPUT_COMPAT_TEST) {
 552                 struct uinput_ff_upload_compat ff_up_compat;
 553
 554                 if (copy_from_user(&ff_up_compat, buffer,
 555                                    sizeof(struct uinput_ff_upload_compat)))
 556                         return -EFAULT;
 557
 558                 ff_up->request_id = ff_up_compat.request_id;
 559                 ff_up->retval = ff_up_compat.retval;
 560                 memcpy(&ff_up->effect, &ff_up_compat.effect,
 561                         sizeof(struct ff_effect_compat));
 562                 memcpy(&ff_up->old, &ff_up_compat.old,
 563                         sizeof(struct ff_effect_compat));
 564
 565         } else {
 566                 if (copy_from_user(ff_up, buffer,
 567                                    sizeof(struct uinput_ff_upload)))
 568                         return -EFAULT;
 569         }
 570
 571         return 0;
 572 }
 573
 574 #else
 575
 576 static int uinput_ff_upload_to_user(char __user *buffer,
 577                                     const struct uinput_ff_upload *ff_up)
 578 {
 579         if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
 580                 return -EFAULT;
 581
 582         return 0;
 583 }
 584
 585 static int uinput_ff_upload_from_user(const char __user *buffer,
 586                                       struct uinput_ff_upload *ff_up)
 587 {
 588         if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
 589                 return -EFAULT;
 590
 591         return 0;
 592 }
 593
 594 #endif
 595
 596 #define uinput_set_bit(_arg, _bit, _max)                \
 597 ({                                                      \
 598         int __ret = 0;                                  \
 599         if (udev->state == UIST_CREATED)                \
 600                 __ret =  -EINVAL;                       \
 601         else if ((_arg) > (_max))                       \
 602                 __ret = -EINVAL;                        \
 603         else set_bit((_arg), udev->dev->_bit);          \
 604         __ret;                                          \
 605 })
 606
 607 static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
 608                                  unsigned long arg, void __user *p)
 609 {
 610         int                     retval;
 611         struct uinput_device    *udev = file->private_data;
 612         struct uinput_ff_upload ff_up;
 613         struct uinput_ff_erase  ff_erase;
 614         struct uinput_request   *req;
 615         int                     length;
 616         char                    *phys;
 617
 618         retval = mutex_lock_interruptible(&udev->mutex);
 619         if (retval)
 620                 return retval;
 621
 622         if (!udev->dev) {
 623                 retval = uinput_allocate_device(udev);
 624                 if (retval)
 625                         goto out;
 626         }
 627
 628         switch (cmd) {
 629                 case UI_DEV_CREATE:
 630                         retval = uinput_create_device(udev);
 631                         break;
 632
 633                 case UI_DEV_DESTROY:
 634                         uinput_destroy_device(udev);
 635                         break;
 636
 637                 case UI_SET_EVBIT:
 638                         retval = uinput_set_bit(arg, evbit, EV_MAX);
 639                         break;
 640
 641                 case UI_SET_KEYBIT:
 642                         retval = uinput_set_bit(arg, keybit, KEY_MAX);
 643                         break;
 644
 645                 case UI_SET_RELBIT:
 646                         retval = uinput_set_bit(arg, relbit, REL_MAX);
 647                         break;
 648
 649                 case UI_SET_ABSBIT:
 650                         retval = uinput_set_bit(arg, absbit, ABS_MAX);
 651                         break;
 652
 653                 case UI_SET_MSCBIT:
 654                         retval = uinput_set_bit(arg, mscbit, MSC_MAX);
 655                         break;
 656
 657                 case UI_SET_LEDBIT:
 658                         retval = uinput_set_bit(arg, ledbit, LED_MAX);
 659                         break;
 660
 661                 case UI_SET_SNDBIT:
 662                         retval = uinput_set_bit(arg, sndbit, SND_MAX);
 663                         break;
 664
 665                 case UI_SET_FFBIT:
 666                         retval = uinput_set_bit(arg, ffbit, FF_MAX);
 667                         break;
 668
 669                 case UI_SET_SWBIT:
 670                         retval = uinput_set_bit(arg, swbit, SW_MAX);
 671                         break;
 672
 673                 case UI_SET_PHYS:
 674                         if (udev->state == UIST_CREATED) {
 675                                 retval = -EINVAL;
 676                                 goto out;
 677                         }
 678                         length = strnlen_user(p, 1024);
 679                         if (length <= 0) {
 680                                 retval = -EFAULT;
 681                                 break;
 682                         }
 683                         kfree(udev->dev->phys);
 684                         udev->dev->phys = phys = kmalloc(length, GFP_KERNEL);
 685                         if (!phys) {
 686                                 retval = -ENOMEM;
 687                                 break;
 688                         }
 689                         if (copy_from_user(phys, p, length)) {
 690                                 udev->dev->phys = NULL;
 691                                 kfree(phys);
 692                                 retval = -EFAULT;
 693                                 break;
 694                         }
 695                         phys[length - 1] = '\0';
 696                         break;
 697
 698                 case UI_BEGIN_FF_UPLOAD:
 699                         retval = uinput_ff_upload_from_user(p, &ff_up);
 700                         if (retval)
 701                                 break;
 702
 703                         req = uinput_request_find(udev, ff_up.request_id);
 704                         if (!req || req->code != UI_FF_UPLOAD || !req->u.upload.effect) {
 705                                 retval = -EINVAL;
 706                                 break;
 707                         }
 708
 709                         ff_up.retval = 0;
 710                         ff_up.effect = *req->u.upload.effect;
 711                         if (req->u.upload.old)
 712                                 ff_up.old = *req->u.upload.old;
 713                         else
 714                                 memset(&ff_up.old, 0, sizeof(struct ff_effect));
 715
 716                         retval = uinput_ff_upload_to_user(p, &ff_up);
 717                         break;
 718
 719                 case UI_BEGIN_FF_ERASE:
 720                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 721                                 retval = -EFAULT;
 722                                 break;
 723                         }
 724
 725                         req = uinput_request_find(udev, ff_erase.request_id);
 726                         if (!req || req->code != UI_FF_ERASE) {
 727                                 retval = -EINVAL;
 728                                 break;
 729                         }
 730
 731                         ff_erase.retval = 0;
 732                         ff_erase.effect_id = req->u.effect_id;
 733                         if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
 734                                 retval = -EFAULT;
 735                                 break;
 736                         }
 737
 738                         break;
 739
 740                 case UI_END_FF_UPLOAD:
 741                         retval = uinput_ff_upload_from_user(p, &ff_up);
 742                         if (retval)
 743                                 break;
 744
 745                         req = uinput_request_find(udev, ff_up.request_id);
 746                         if (!req || req->code != UI_FF_UPLOAD ||
 747                             !req->u.upload.effect) {
 748                                 retval = -EINVAL;
 749                                 break;
 750                         }
 751
 752                         req->retval = ff_up.retval;
 753                         uinput_request_done(udev, req);
 754                         break;
 755
 756                 case UI_END_FF_ERASE:
 757                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 758                                 retval = -EFAULT;
 759                                 break;
 760                         }
 761
 762                         req = uinput_request_find(udev, ff_erase.request_id);
 763                         if (!req || req->code != UI_FF_ERASE) {
 764                                 retval = -EINVAL;
 765                                 break;
 766                         }
 767
 768                         req->retval = ff_erase.retval;
 769                         uinput_request_done(udev, req);
 770                         break;
 771
 772                 default:
 773                         retval = -EINVAL;
 774         }
 775
 776  out:
 777         mutex_unlock(&udev->mutex);
 778         return retval;
 779 }
 780
 781 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 782 {
 783         return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
 784 }
 785
 786 #ifdef CONFIG_COMPAT
 787 static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 788 {
 789         return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
 790 }
 791 #endif
 792
 793 static const struct file_operations uinput_fops = {
 794         .owner          = THIS_MODULE,
 795         .open           = uinput_open,
 796         .release        = uinput_release,
 797         .read           = uinput_read,
 798         .write          = uinput_write,
 799         .poll           = uinput_poll,
 800         .unlocked_ioctl = uinput_ioctl,
 801 #ifdef CONFIG_COMPAT
 802         .compat_ioctl   = uinput_compat_ioctl,
 803 #endif
 804 };
 805
 806 static struct miscdevice uinput_misc = {
 807         .fops           = &uinput_fops,
 808         .minor          = UINPUT_MINOR,
 809         .name           = UINPUT_NAME,
 810 };
 811
 812 static int __init uinput_init(void)
 813 {
 814         return misc_register(&uinput_misc);
 815 }
 816
 817 static void __exit uinput_exit(void)
 818 {
 819         misc_deregister(&uinput_misc);
 820 }
 821
 822 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
 823 MODULE_DESCRIPTION("User level driver support for input subsystem");
 824 MODULE_LICENSE("GPL");
 825 MODULE_VERSION("0.3");
 826
 827 module_init(uinput_init);
 828 module_exit(uinput_exit);
 829