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