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