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