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  *      0.4     01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>)
  24  *              - add UI_GET_SYSNAME ioctl
  25  *      0.3     09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>)
  26  *              - updated ff support for the changes in kernel interface
  27  *              - added MODULE_VERSION
  28  *      0.2     16/10/2004 (Micah Dowty <micah@navi.cx>)
  29  *              - added force feedback support
  30  *              - added UI_SET_PHYS
  31  *      0.1     20/06/2002
  32  *              - first public version
  33  */
  34 #include <linux/poll.h>
  35 #include <linux/sched.h>
  36 #include <linux/slab.h>
  37 #include <linux/module.h>
  38 #include <linux/init.h>
  39 #include <linux/fs.h>
  40 #include <linux/miscdevice.h>
  41 #include <linux/uinput.h>
  42 #include <linux/input/mt.h>
  43 #include "../input-compat.h"
  44
  45 static int uinput_dev_event(struct input_dev *dev,
  46                             unsigned int type, unsigned int code, int value)
  47 {
  48         struct uinput_device    *udev = input_get_drvdata(dev);
  49
  50         udev->buff[udev->head].type = type;
  51         udev->buff[udev->head].code = code;
  52         udev->buff[udev->head].value = value;
  53         do_gettimeofday(&udev->buff[udev->head].time);
  54         udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
  55
  56         wake_up_interruptible(&udev->waitq);
  57
  58         return 0;
  59 }
  60
  61 /* Atomically allocate an ID for the given request. Returns 0 on success. */
  62 static bool uinput_request_alloc_id(struct uinput_device *udev,
  63                                     struct uinput_request *request)
  64 {
  65         unsigned int id;
  66         bool reserved = false;
  67
  68         spin_lock(&udev->requests_lock);
  69
  70         for (id = 0; id < UINPUT_NUM_REQUESTS; id++) {
  71                 if (!udev->requests[id]) {
  72                         request->id = id;
  73                         udev->requests[id] = request;
  74                         reserved = true;
  75                         break;
  76                 }
  77         }
  78
  79         spin_unlock(&udev->requests_lock);
  80         return reserved;
  81 }
  82
  83 static struct uinput_request *uinput_request_find(struct uinput_device *udev,
  84                                                   unsigned int id)
  85 {
  86         /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
  87         if (id >= UINPUT_NUM_REQUESTS)
  88                 return NULL;
  89
  90         return udev->requests[id];
  91 }
  92
  93 static int uinput_request_reserve_slot(struct uinput_device *udev,
  94                                        struct uinput_request *request)
  95 {
  96         /* Allocate slot. If none are available right away, wait. */
  97         return wait_event_interruptible(udev->requests_waitq,
  98                                         uinput_request_alloc_id(udev, request));
  99 }
 100
 101 static void uinput_request_done(struct uinput_device *udev,
 102                                 struct uinput_request *request)
 103 {
 104         /* Mark slot as available */
 105         udev->requests[request->id] = NULL;
 106         wake_up(&udev->requests_waitq);
 107
 108         complete(&request->done);
 109 }
 110
 111 static int uinput_request_send(struct uinput_device *udev,
 112                                struct uinput_request *request)
 113 {
 114         int retval;
 115
 116         retval = mutex_lock_interruptible(&udev->mutex);
 117         if (retval)
 118                 return retval;
 119
 120         if (udev->state != UIST_CREATED) {
 121                 retval = -ENODEV;
 122                 goto out;
 123         }
 124
 125         init_completion(&request->done);
 126
 127         /*
 128          * Tell our userspace application about this new request
 129          * by queueing an input event.
 130          */
 131         uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
 132
 133  out:
 134         mutex_unlock(&udev->mutex);
 135         return retval;
 136 }
 137
 138 static int uinput_request_submit(struct uinput_device *udev,
 139                                  struct uinput_request *request)
 140 {
 141         int error;
 142
 143         error = uinput_request_reserve_slot(udev, request);
 144         if (error)
 145                 return error;
 146
 147         error = uinput_request_send(udev, request);
 148         if (error) {
 149                 uinput_request_done(udev, request);
 150                 return error;
 151         }
 152
 153         wait_for_completion(&request->done);
 154         return request->retval;
 155 }
 156
 157 /*
 158  * Fail all outstanding requests so handlers don't wait for the userspace
 159  * to finish processing them.
 160  */
 161 static void uinput_flush_requests(struct uinput_device *udev)
 162 {
 163         struct uinput_request *request;
 164         int i;
 165
 166         spin_lock(&udev->requests_lock);
 167
 168         for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
 169                 request = udev->requests[i];
 170                 if (request) {
 171                         request->retval = -ENODEV;
 172                         uinput_request_done(udev, request);
 173                 }
 174         }
 175
 176         spin_unlock(&udev->requests_lock);
 177 }
 178
 179 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
 180 {
 181         uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
 182 }
 183
 184 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
 185 {
 186         uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
 187 }
 188
 189 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
 190 {
 191         return uinput_dev_event(dev, EV_FF, effect_id, value);
 192 }
 193
 194 static int uinput_dev_upload_effect(struct input_dev *dev,
 195                                     struct ff_effect *effect,
 196                                     struct ff_effect *old)
 197 {
 198         struct uinput_device *udev = input_get_drvdata(dev);
 199         struct uinput_request request;
 200
 201         /*
 202          * uinput driver does not currently support periodic effects with
 203          * custom waveform since it does not have a way to pass buffer of
 204          * samples (custom_data) to userspace. If ever there is a device
 205          * supporting custom waveforms we would need to define an additional
 206          * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
 207          */
 208         if (effect->type == FF_PERIODIC &&
 209                         effect->u.periodic.waveform == FF_CUSTOM)
 210                 return -EINVAL;
 211
 212         request.code = UI_FF_UPLOAD;
 213         request.u.upload.effect = effect;
 214         request.u.upload.old = old;
 215
 216         return uinput_request_submit(udev, &request);
 217 }
 218
 219 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
 220 {
 221         struct uinput_device *udev = input_get_drvdata(dev);
 222         struct uinput_request request;
 223
 224         if (!test_bit(EV_FF, dev->evbit))
 225                 return -ENOSYS;
 226
 227         request.code = UI_FF_ERASE;
 228         request.u.effect_id = effect_id;
 229
 230         return uinput_request_submit(udev, &request);
 231 }
 232
 233 static int uinput_dev_flush(struct input_dev *dev, struct file *file)
 234 {
 235         /*
 236          * If we are called with file == NULL that means we are tearing
 237          * down the device, and therefore we can not handle FF erase
 238          * requests: either we are handling UI_DEV_DESTROY (and holding
 239          * the udev->mutex), or the file descriptor is closed and there is
 240          * nobody on the other side anymore.
 241          */
 242         return file ? input_ff_flush(dev, file) : 0;
 243 }
 244
 245 static void uinput_destroy_device(struct uinput_device *udev)
 246 {
 247         const char *name, *phys;
 248         struct input_dev *dev = udev->dev;
 249         enum uinput_state old_state = udev->state;
 250
 251         udev->state = UIST_NEW_DEVICE;
 252
 253         if (dev) {
 254                 name = dev->name;
 255                 phys = dev->phys;
 256                 if (old_state == UIST_CREATED) {
 257                         uinput_flush_requests(udev);
 258                         input_unregister_device(dev);
 259                 } else {
 260                         input_free_device(dev);
 261                 }
 262                 kfree(name);
 263                 kfree(phys);
 264                 udev->dev = NULL;
 265         }
 266 }
 267
 268 static int uinput_create_device(struct uinput_device *udev)
 269 {
 270         struct input_dev *dev = udev->dev;
 271         int error;
 272
 273         if (udev->state != UIST_SETUP_COMPLETE) {
 274                 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
 275                 return -EINVAL;
 276         }
 277
 278         if (udev->ff_effects_max) {
 279                 error = input_ff_create(dev, udev->ff_effects_max);
 280                 if (error)
 281                         goto fail1;
 282
 283                 dev->ff->upload = uinput_dev_upload_effect;
 284                 dev->ff->erase = uinput_dev_erase_effect;
 285                 dev->ff->playback = uinput_dev_playback;
 286                 dev->ff->set_gain = uinput_dev_set_gain;
 287                 dev->ff->set_autocenter = uinput_dev_set_autocenter;
 288                 /*
 289                  * The standard input_ff_flush() implementation does
 290                  * not quite work for uinput as we can't reasonably
 291                  * handle FF requests during device teardown.
 292                  */
 293                 dev->flush = uinput_dev_flush;
 294         }
 295
 296         error = input_register_device(udev->dev);
 297         if (error)
 298                 goto fail2;
 299
 300         udev->state = UIST_CREATED;
 301
 302         return 0;
 303
 304  fail2: input_ff_destroy(dev);
 305  fail1: uinput_destroy_device(udev);
 306         return error;
 307 }
 308
 309 static int uinput_open(struct inode *inode, struct file *file)
 310 {
 311         struct uinput_device *newdev;
 312
 313         newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
 314         if (!newdev)
 315                 return -ENOMEM;
 316
 317         mutex_init(&newdev->mutex);
 318         spin_lock_init(&newdev->requests_lock);
 319         init_waitqueue_head(&newdev->requests_waitq);
 320         init_waitqueue_head(&newdev->waitq);
 321         newdev->state = UIST_NEW_DEVICE;
 322
 323         file->private_data = newdev;
 324         nonseekable_open(inode, file);
 325
 326         return 0;
 327 }
 328
 329 static int uinput_validate_absbits(struct input_dev *dev)
 330 {
 331         unsigned int cnt;
 332         int nslot;
 333
 334         if (!test_bit(EV_ABS, dev->evbit))
 335                 return 0;
 336
 337         /*
 338          * Check if absmin/absmax/absfuzz/absflat are sane.
 339          */
 340
 341         for_each_set_bit(cnt, dev->absbit, ABS_CNT) {
 342                 int min, max;
 343
 344                 min = input_abs_get_min(dev, cnt);
 345                 max = input_abs_get_max(dev, cnt);
 346
 347                 if ((min != 0 || max != 0) && max <= min) {
 348                         printk(KERN_DEBUG
 349                                 "%s: invalid abs[%02x] min:%d max:%d\n",
 350                                 UINPUT_NAME, cnt,
 351                                 input_abs_get_min(dev, cnt),
 352                                 input_abs_get_max(dev, cnt));
 353                         return -EINVAL;
 354                 }
 355
 356                 if (input_abs_get_flat(dev, cnt) >
 357                     input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) {
 358                         printk(KERN_DEBUG
 359                                 "%s: abs_flat #%02x out of range: %d "
 360                                 "(min:%d/max:%d)\n",
 361                                 UINPUT_NAME, cnt,
 362                                 input_abs_get_flat(dev, cnt),
 363                                 input_abs_get_min(dev, cnt),
 364                                 input_abs_get_max(dev, cnt));
 365                         return -EINVAL;
 366                 }
 367         }
 368
 369         if (test_bit(ABS_MT_SLOT, dev->absbit)) {
 370                 nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
 371                 input_mt_init_slots(dev, nslot, 0);
 372         } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
 373                 input_set_events_per_packet(dev, 60);
 374         }
 375
 376         return 0;
 377 }
 378
 379 static int uinput_allocate_device(struct uinput_device *udev)
 380 {
 381         udev->dev = input_allocate_device();
 382         if (!udev->dev)
 383                 return -ENOMEM;
 384
 385         udev->dev->event = uinput_dev_event;
 386         input_set_drvdata(udev->dev, udev);
 387
 388         return 0;
 389 }
 390
 391 static int uinput_setup_device(struct uinput_device *udev,
 392                                const char __user *buffer, size_t count)
 393 {
 394         struct uinput_user_dev  *user_dev;
 395         struct input_dev        *dev;
 396         int                     i;
 397         int                     retval;
 398
 399         if (count != sizeof(struct uinput_user_dev))
 400                 return -EINVAL;
 401
 402         if (!udev->dev) {
 403                 retval = uinput_allocate_device(udev);
 404                 if (retval)
 405                         return retval;
 406         }
 407
 408         dev = udev->dev;
 409
 410         user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
 411         if (IS_ERR(user_dev))
 412                 return PTR_ERR(user_dev);
 413
 414         udev->ff_effects_max = user_dev->ff_effects_max;
 415
 416         /* Ensure name is filled in */
 417         if (!user_dev->name[0]) {
 418                 retval = -EINVAL;
 419                 goto exit;
 420         }
 421
 422         kfree(dev->name);
 423         dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
 424                              GFP_KERNEL);
 425         if (!dev->name) {
 426                 retval = -ENOMEM;
 427                 goto exit;
 428         }
 429
 430         dev->id.bustype = user_dev->id.bustype;
 431         dev->id.vendor  = user_dev->id.vendor;
 432         dev->id.product = user_dev->id.product;
 433         dev->id.version = user_dev->id.version;
 434
 435         for (i = 0; i < ABS_CNT; i++) {
 436                 input_abs_set_max(dev, i, user_dev->absmax[i]);
 437                 input_abs_set_min(dev, i, user_dev->absmin[i]);
 438                 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
 439                 input_abs_set_flat(dev, i, user_dev->absflat[i]);
 440         }
 441
 442         retval = uinput_validate_absbits(dev);
 443         if (retval < 0)
 444                 goto exit;
 445
 446         udev->state = UIST_SETUP_COMPLETE;
 447         retval = count;
 448
 449  exit:
 450         kfree(user_dev);
 451         return retval;
 452 }
 453
 454 static ssize_t uinput_inject_events(struct uinput_device *udev,
 455                                     const char __user *buffer, size_t count)
 456 {
 457         struct input_event ev;
 458         size_t bytes = 0;
 459
 460         if (count != 0 && count < input_event_size())
 461                 return -EINVAL;
 462
 463         while (bytes + input_event_size() <= count) {
 464                 /*
 465                  * Note that even if some events were fetched successfully
 466                  * we are still going to return EFAULT instead of partial
 467                  * count to let userspace know that it got it's buffers
 468                  * all wrong.
 469                  */
 470                 if (input_event_from_user(buffer + bytes, &ev))
 471                         return -EFAULT;
 472
 473                 input_event(udev->dev, ev.type, ev.code, ev.value);
 474                 bytes += input_event_size();
 475         }
 476
 477         return bytes;
 478 }
 479
 480 static ssize_t uinput_write(struct file *file, const char __user *buffer,
 481                             size_t count, loff_t *ppos)
 482 {
 483         struct uinput_device *udev = file->private_data;
 484         int retval;
 485
 486         if (count == 0)
 487                 return 0;
 488
 489         retval = mutex_lock_interruptible(&udev->mutex);
 490         if (retval)
 491                 return retval;
 492
 493         retval = udev->state == UIST_CREATED ?
 494                         uinput_inject_events(udev, buffer, count) :
 495                         uinput_setup_device(udev, buffer, count);
 496
 497         mutex_unlock(&udev->mutex);
 498
 499         return retval;
 500 }
 501
 502 static bool uinput_fetch_next_event(struct uinput_device *udev,
 503                                     struct input_event *event)
 504 {
 505         bool have_event;
 506
 507         spin_lock_irq(&udev->dev->event_lock);
 508
 509         have_event = udev->head != udev->tail;
 510         if (have_event) {
 511                 *event = udev->buff[udev->tail];
 512                 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
 513         }
 514
 515         spin_unlock_irq(&udev->dev->event_lock);
 516
 517         return have_event;
 518 }
 519
 520 static ssize_t uinput_events_to_user(struct uinput_device *udev,
 521                                      char __user *buffer, size_t count)
 522 {
 523         struct input_event event;
 524         size_t read = 0;
 525
 526         while (read + input_event_size() <= count &&
 527                uinput_fetch_next_event(udev, &event)) {
 528
 529                 if (input_event_to_user(buffer + read, &event))
 530                         return -EFAULT;
 531
 532                 read += input_event_size();
 533         }
 534
 535         return read;
 536 }
 537
 538 static ssize_t uinput_read(struct file *file, char __user *buffer,
 539                            size_t count, loff_t *ppos)
 540 {
 541         struct uinput_device *udev = file->private_data;
 542         ssize_t retval;
 543
 544         if (count != 0 && count < input_event_size())
 545                 return -EINVAL;
 546
 547         do {
 548                 retval = mutex_lock_interruptible(&udev->mutex);
 549                 if (retval)
 550                         return retval;
 551
 552                 if (udev->state != UIST_CREATED)
 553                         retval = -ENODEV;
 554                 else if (udev->head == udev->tail &&
 555                          (file->f_flags & O_NONBLOCK))
 556                         retval = -EAGAIN;
 557                 else
 558                         retval = uinput_events_to_user(udev, buffer, count);
 559
 560                 mutex_unlock(&udev->mutex);
 561
 562                 if (retval || count == 0)
 563                         break;
 564
 565                 if (!(file->f_flags & O_NONBLOCK))
 566                         retval = wait_event_interruptible(udev->waitq,
 567                                                   udev->head != udev->tail ||
 568                                                   udev->state != UIST_CREATED);
 569         } while (retval == 0);
 570
 571         return retval;
 572 }
 573
 574 static unsigned int uinput_poll(struct file *file, poll_table *wait)
 575 {
 576         struct uinput_device *udev = file->private_data;
 577
 578         poll_wait(file, &udev->waitq, wait);
 579
 580         if (udev->head != udev->tail)
 581                 return POLLIN | POLLRDNORM;
 582
 583         return 0;
 584 }
 585
 586 static int uinput_release(struct inode *inode, struct file *file)
 587 {
 588         struct uinput_device *udev = file->private_data;
 589
 590         uinput_destroy_device(udev);
 591         kfree(udev);
 592
 593         return 0;
 594 }
 595
 596 #ifdef CONFIG_COMPAT
 597 struct uinput_ff_upload_compat {
 598         __u32                   request_id;
 599         __s32                   retval;
 600         struct ff_effect_compat effect;
 601         struct ff_effect_compat old;
 602 };
 603
 604 static int uinput_ff_upload_to_user(char __user *buffer,
 605                                     const struct uinput_ff_upload *ff_up)
 606 {
 607         if (INPUT_COMPAT_TEST) {
 608                 struct uinput_ff_upload_compat ff_up_compat;
 609
 610                 ff_up_compat.request_id = ff_up->request_id;
 611                 ff_up_compat.retval = ff_up->retval;
 612                 /*
 613                  * It so happens that the pointer that gives us the trouble
 614                  * is the last field in the structure. Since we don't support
 615                  * custom waveforms in uinput anyway we can just copy the whole
 616                  * thing (to the compat size) and ignore the pointer.
 617                  */
 618                 memcpy(&ff_up_compat.effect, &ff_up->effect,
 619                         sizeof(struct ff_effect_compat));
 620                 memcpy(&ff_up_compat.old, &ff_up->old,
 621                         sizeof(struct ff_effect_compat));
 622
 623                 if (copy_to_user(buffer, &ff_up_compat,
 624                                  sizeof(struct uinput_ff_upload_compat)))
 625                         return -EFAULT;
 626         } else {
 627                 if (copy_to_user(buffer, ff_up,
 628                                  sizeof(struct uinput_ff_upload)))
 629                         return -EFAULT;
 630         }
 631
 632         return 0;
 633 }
 634
 635 static int uinput_ff_upload_from_user(const char __user *buffer,
 636                                       struct uinput_ff_upload *ff_up)
 637 {
 638         if (INPUT_COMPAT_TEST) {
 639                 struct uinput_ff_upload_compat ff_up_compat;
 640
 641                 if (copy_from_user(&ff_up_compat, buffer,
 642                                    sizeof(struct uinput_ff_upload_compat)))
 643                         return -EFAULT;
 644
 645                 ff_up->request_id = ff_up_compat.request_id;
 646                 ff_up->retval = ff_up_compat.retval;
 647                 memcpy(&ff_up->effect, &ff_up_compat.effect,
 648                         sizeof(struct ff_effect_compat));
 649                 memcpy(&ff_up->old, &ff_up_compat.old,
 650                         sizeof(struct ff_effect_compat));
 651
 652         } else {
 653                 if (copy_from_user(ff_up, buffer,
 654                                    sizeof(struct uinput_ff_upload)))
 655                         return -EFAULT;
 656         }
 657
 658         return 0;
 659 }
 660
 661 #else
 662
 663 static int uinput_ff_upload_to_user(char __user *buffer,
 664                                     const struct uinput_ff_upload *ff_up)
 665 {
 666         if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
 667                 return -EFAULT;
 668
 669         return 0;
 670 }
 671
 672 static int uinput_ff_upload_from_user(const char __user *buffer,
 673                                       struct uinput_ff_upload *ff_up)
 674 {
 675         if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
 676                 return -EFAULT;
 677
 678         return 0;
 679 }
 680
 681 #endif
 682
 683 #define uinput_set_bit(_arg, _bit, _max)                \
 684 ({                                                      \
 685         int __ret = 0;                                  \
 686         if (udev->state == UIST_CREATED)                \
 687                 __ret =  -EINVAL;                       \
 688         else if ((_arg) > (_max))                       \
 689                 __ret = -EINVAL;                        \
 690         else set_bit((_arg), udev->dev->_bit);          \
 691         __ret;                                          \
 692 })
 693
 694 static int uinput_str_to_user(void __user *dest, const char *str,
 695                               unsigned int maxlen)
 696 {
 697         char __user *p = dest;
 698         int len, ret;
 699
 700         if (!str)
 701                 return -ENOENT;
 702
 703         if (maxlen == 0)
 704                 return -EINVAL;
 705
 706         len = strlen(str) + 1;
 707         if (len > maxlen)
 708                 len = maxlen;
 709
 710         ret = copy_to_user(p, str, len);
 711         if (ret)
 712                 return -EFAULT;
 713
 714         /* force terminating '\0' */
 715         ret = put_user(0, p + len - 1);
 716         return ret ? -EFAULT : len;
 717 }
 718
 719 static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
 720                                  unsigned long arg, void __user *p)
 721 {
 722         int                     retval;
 723         struct uinput_device    *udev = file->private_data;
 724         struct uinput_ff_upload ff_up;
 725         struct uinput_ff_erase  ff_erase;
 726         struct uinput_request   *req;
 727         char                    *phys;
 728         const char              *name;
 729         unsigned int            size;
 730
 731         retval = mutex_lock_interruptible(&udev->mutex);
 732         if (retval)
 733                 return retval;
 734
 735         if (!udev->dev) {
 736                 retval = uinput_allocate_device(udev);
 737                 if (retval)
 738                         goto out;
 739         }
 740
 741         switch (cmd) {
 742                 case UI_GET_VERSION:
 743                         if (put_user(UINPUT_VERSION,
 744                                      (unsigned int __user *)p))
 745                                 retval = -EFAULT;
 746                         goto out;
 747
 748                 case UI_DEV_CREATE:
 749                         retval = uinput_create_device(udev);
 750                         goto out;
 751
 752                 case UI_DEV_DESTROY:
 753                         uinput_destroy_device(udev);
 754                         goto out;
 755
 756                 case UI_SET_EVBIT:
 757                         retval = uinput_set_bit(arg, evbit, EV_MAX);
 758                         goto out;
 759
 760                 case UI_SET_KEYBIT:
 761                         retval = uinput_set_bit(arg, keybit, KEY_MAX);
 762                         goto out;
 763
 764                 case UI_SET_RELBIT:
 765                         retval = uinput_set_bit(arg, relbit, REL_MAX);
 766                         goto out;
 767
 768                 case UI_SET_ABSBIT:
 769                         retval = uinput_set_bit(arg, absbit, ABS_MAX);
 770                         goto out;
 771
 772                 case UI_SET_MSCBIT:
 773                         retval = uinput_set_bit(arg, mscbit, MSC_MAX);
 774                         goto out;
 775
 776                 case UI_SET_LEDBIT:
 777                         retval = uinput_set_bit(arg, ledbit, LED_MAX);
 778                         goto out;
 779
 780                 case UI_SET_SNDBIT:
 781                         retval = uinput_set_bit(arg, sndbit, SND_MAX);
 782                         goto out;
 783
 784                 case UI_SET_FFBIT:
 785                         retval = uinput_set_bit(arg, ffbit, FF_MAX);
 786                         goto out;
 787
 788                 case UI_SET_SWBIT:
 789                         retval = uinput_set_bit(arg, swbit, SW_MAX);
 790                         goto out;
 791
 792                 case UI_SET_PROPBIT:
 793                         retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
 794                         goto out;
 795
 796                 case UI_SET_PHYS:
 797                         if (udev->state == UIST_CREATED) {
 798                                 retval = -EINVAL;
 799                                 goto out;
 800                         }
 801
 802                         phys = strndup_user(p, 1024);
 803                         if (IS_ERR(phys)) {
 804                                 retval = PTR_ERR(phys);
 805                                 goto out;
 806                         }
 807
 808                         kfree(udev->dev->phys);
 809                         udev->dev->phys = phys;
 810                         goto out;
 811
 812                 case UI_BEGIN_FF_UPLOAD:
 813                         retval = uinput_ff_upload_from_user(p, &ff_up);
 814                         if (retval)
 815                                 goto out;
 816
 817                         req = uinput_request_find(udev, ff_up.request_id);
 818                         if (!req || req->code != UI_FF_UPLOAD ||
 819                             !req->u.upload.effect) {
 820                                 retval = -EINVAL;
 821                                 goto out;
 822                         }
 823
 824                         ff_up.retval = 0;
 825                         ff_up.effect = *req->u.upload.effect;
 826                         if (req->u.upload.old)
 827                                 ff_up.old = *req->u.upload.old;
 828                         else
 829                                 memset(&ff_up.old, 0, sizeof(struct ff_effect));
 830
 831                         retval = uinput_ff_upload_to_user(p, &ff_up);
 832                         goto out;
 833
 834                 case UI_BEGIN_FF_ERASE:
 835                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 836                                 retval = -EFAULT;
 837                                 goto out;
 838                         }
 839
 840                         req = uinput_request_find(udev, ff_erase.request_id);
 841                         if (!req || req->code != UI_FF_ERASE) {
 842                                 retval = -EINVAL;
 843                                 goto out;
 844                         }
 845
 846                         ff_erase.retval = 0;
 847                         ff_erase.effect_id = req->u.effect_id;
 848                         if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
 849                                 retval = -EFAULT;
 850                                 goto out;
 851                         }
 852
 853                         goto out;
 854
 855                 case UI_END_FF_UPLOAD:
 856                         retval = uinput_ff_upload_from_user(p, &ff_up);
 857                         if (retval)
 858                                 goto out;
 859
 860                         req = uinput_request_find(udev, ff_up.request_id);
 861                         if (!req || req->code != UI_FF_UPLOAD ||
 862                             !req->u.upload.effect) {
 863                                 retval = -EINVAL;
 864                                 goto out;
 865                         }
 866
 867                         req->retval = ff_up.retval;
 868                         uinput_request_done(udev, req);
 869                         goto out;
 870
 871                 case UI_END_FF_ERASE:
 872                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 873                                 retval = -EFAULT;
 874                                 goto out;
 875                         }
 876
 877                         req = uinput_request_find(udev, ff_erase.request_id);
 878                         if (!req || req->code != UI_FF_ERASE) {
 879                                 retval = -EINVAL;
 880                                 goto out;
 881                         }
 882
 883                         req->retval = ff_erase.retval;
 884                         uinput_request_done(udev, req);
 885                         goto out;
 886         }
 887
 888         size = _IOC_SIZE(cmd);
 889
 890         /* Now check variable-length commands */
 891         switch (cmd & ~IOCSIZE_MASK) {
 892         case UI_GET_SYSNAME(0):
 893                 if (udev->state != UIST_CREATED) {
 894                         retval = -ENOENT;
 895                         goto out;
 896                 }
 897                 name = dev_name(&udev->dev->dev);
 898                 retval = uinput_str_to_user(p, name, size);
 899                 goto out;
 900         }
 901
 902         retval = -EINVAL;
 903  out:
 904         mutex_unlock(&udev->mutex);
 905         return retval;
 906 }
 907
 908 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 909 {
 910         return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
 911 }
 912
 913 #ifdef CONFIG_COMPAT
 914
 915 /*
 916  * These IOCTLs change their size and thus their numbers between
 917  * 32 and 64 bits.
 918  */
 919 #define UI_SET_PHYS_COMPAT              \
 920         _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t)
 921 #define UI_BEGIN_FF_UPLOAD_COMPAT       \
 922         _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload_compat)
 923 #define UI_END_FF_UPLOAD_COMPAT         \
 924         _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload_compat)
 925
 926 static long uinput_compat_ioctl(struct file *file,
 927                                 unsigned int cmd, unsigned long arg)
 928 {
 929         switch (cmd) {
 930         case UI_SET_PHYS_COMPAT:
 931                 cmd = UI_SET_PHYS;
 932                 break;
 933         case UI_BEGIN_FF_UPLOAD_COMPAT:
 934                 cmd = UI_BEGIN_FF_UPLOAD;
 935                 break;
 936         case UI_END_FF_UPLOAD_COMPAT:
 937                 cmd = UI_END_FF_UPLOAD;
 938                 break;
 939         }
 940
 941         return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
 942 }
 943 #endif
 944
 945 static const struct file_operations uinput_fops = {
 946         .owner          = THIS_MODULE,
 947         .open           = uinput_open,
 948         .release        = uinput_release,
 949         .read           = uinput_read,
 950         .write          = uinput_write,
 951         .poll           = uinput_poll,
 952         .unlocked_ioctl = uinput_ioctl,
 953 #ifdef CONFIG_COMPAT
 954         .compat_ioctl   = uinput_compat_ioctl,
 955 #endif
 956         .llseek         = no_llseek,
 957 };
 958
 959 static struct miscdevice uinput_misc = {
 960         .fops           = &uinput_fops,
 961         .minor          = UINPUT_MINOR,
 962         .name           = UINPUT_NAME,
 963 };
 964 MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
 965 MODULE_ALIAS("devname:" UINPUT_NAME);
 966
 967 static int __init uinput_init(void)
 968 {
 969         return misc_register(&uinput_misc);
 970 }
 971
 972 static void __exit uinput_exit(void)
 973 {
 974         misc_deregister(&uinput_misc);
 975 }
 976
 977 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
 978 MODULE_DESCRIPTION("User level driver support for input subsystem");
 979 MODULE_LICENSE("GPL");
 980 MODULE_VERSION("0.3");
 981
 982 module_init(uinput_init);
 983 module_exit(uinput_exit);