kernel/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 void uinput_destroy_device(struct uinput_device *udev)
 234 {
 235         const char *name, *phys;
 236         struct input_dev *dev = udev->dev;
 237         enum uinput_state old_state = udev->state;
 238
 239         udev->state = UIST_NEW_DEVICE;
 240
 241         if (dev) {
 242                 name = dev->name;
 243                 phys = dev->phys;
 244                 if (old_state == UIST_CREATED) {
 245                         uinput_flush_requests(udev);
 246                         input_unregister_device(dev);
 247                 } else {
 248                         input_free_device(dev);
 249                 }
 250                 kfree(name);
 251                 kfree(phys);
 252                 udev->dev = NULL;
 253         }
 254 }
 255
 256 static int uinput_create_device(struct uinput_device *udev)
 257 {
 258         struct input_dev *dev = udev->dev;
 259         int error;
 260
 261         if (udev->state != UIST_SETUP_COMPLETE) {
 262                 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
 263                 return -EINVAL;
 264         }
 265
 266         if (udev->ff_effects_max) {
 267                 error = input_ff_create(dev, udev->ff_effects_max);
 268                 if (error)
 269                         goto fail1;
 270
 271                 dev->ff->upload = uinput_dev_upload_effect;
 272                 dev->ff->erase = uinput_dev_erase_effect;
 273                 dev->ff->playback = uinput_dev_playback;
 274                 dev->ff->set_gain = uinput_dev_set_gain;
 275                 dev->ff->set_autocenter = uinput_dev_set_autocenter;
 276         }
 277
 278         error = input_register_device(udev->dev);
 279         if (error)
 280                 goto fail2;
 281
 282         udev->state = UIST_CREATED;
 283
 284         return 0;
 285
 286  fail2: input_ff_destroy(dev);
 287  fail1: uinput_destroy_device(udev);
 288         return error;
 289 }
 290
 291 static int uinput_open(struct inode *inode, struct file *file)
 292 {
 293         struct uinput_device *newdev;
 294
 295         newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
 296         if (!newdev)
 297                 return -ENOMEM;
 298
 299         mutex_init(&newdev->mutex);
 300         spin_lock_init(&newdev->requests_lock);
 301         init_waitqueue_head(&newdev->requests_waitq);
 302         init_waitqueue_head(&newdev->waitq);
 303         newdev->state = UIST_NEW_DEVICE;
 304
 305         file->private_data = newdev;
 306         nonseekable_open(inode, file);
 307
 308         return 0;
 309 }
 310
 311 static int uinput_validate_absbits(struct input_dev *dev)
 312 {
 313         unsigned int cnt;
 314         int nslot;
 315
 316         if (!test_bit(EV_ABS, dev->evbit))
 317                 return 0;
 318
 319         /*
 320          * Check if absmin/absmax/absfuzz/absflat are sane.
 321          */
 322
 323         for (cnt = 0; cnt < ABS_CNT; cnt++) {
 324                 int min, max;
 325                 if (!test_bit(cnt, dev->absbit))
 326                         continue;
 327
 328                 min = input_abs_get_min(dev, cnt);
 329                 max = input_abs_get_max(dev, cnt);
 330
 331                 if ((min != 0 || max != 0) && max <= min) {
 332                         printk(KERN_DEBUG
 333                                 "%s: invalid abs[%02x] min:%d max:%d\n",
 334                                 UINPUT_NAME, cnt,
 335                                 input_abs_get_min(dev, cnt),
 336                                 input_abs_get_max(dev, cnt));
 337                         return -EINVAL;
 338                 }
 339
 340                 if (input_abs_get_flat(dev, cnt) >
 341                     input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) {
 342                         printk(KERN_DEBUG
 343                                 "%s: abs_flat #%02x out of range: %d "
 344                                 "(min:%d/max:%d)\n",
 345                                 UINPUT_NAME, cnt,
 346                                 input_abs_get_flat(dev, cnt),
 347                                 input_abs_get_min(dev, cnt),
 348                                 input_abs_get_max(dev, cnt));
 349                         return -EINVAL;
 350                 }
 351         }
 352
 353         if (test_bit(ABS_MT_SLOT, dev->absbit)) {
 354                 nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
 355                 input_mt_init_slots(dev, nslot, 0);
 356         } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
 357                 input_set_events_per_packet(dev, 60);
 358         }
 359
 360         return 0;
 361 }
 362
 363 static int uinput_allocate_device(struct uinput_device *udev)
 364 {
 365         udev->dev = input_allocate_device();
 366         if (!udev->dev)
 367                 return -ENOMEM;
 368
 369         udev->dev->event = uinput_dev_event;
 370         input_set_drvdata(udev->dev, udev);
 371
 372         return 0;
 373 }
 374
 375 static int uinput_setup_device(struct uinput_device *udev,
 376                                const char __user *buffer, size_t count)
 377 {
 378         struct uinput_user_dev  *user_dev;
 379         struct input_dev        *dev;
 380         int                     i;
 381         int                     retval;
 382
 383         if (count != sizeof(struct uinput_user_dev))
 384                 return -EINVAL;
 385
 386         if (!udev->dev) {
 387                 retval = uinput_allocate_device(udev);
 388                 if (retval)
 389                         return retval;
 390         }
 391
 392         dev = udev->dev;
 393
 394         user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
 395         if (IS_ERR(user_dev))
 396                 return PTR_ERR(user_dev);
 397
 398         udev->ff_effects_max = user_dev->ff_effects_max;
 399
 400         /* Ensure name is filled in */
 401         if (!user_dev->name[0]) {
 402                 retval = -EINVAL;
 403                 goto exit;
 404         }
 405
 406         kfree(dev->name);
 407         dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
 408                              GFP_KERNEL);
 409         if (!dev->name) {
 410                 retval = -ENOMEM;
 411                 goto exit;
 412         }
 413
 414         dev->id.bustype = user_dev->id.bustype;
 415         dev->id.vendor  = user_dev->id.vendor;
 416         dev->id.product = user_dev->id.product;
 417         dev->id.version = user_dev->id.version;
 418
 419         for (i = 0; i < ABS_CNT; i++) {
 420                 input_abs_set_max(dev, i, user_dev->absmax[i]);
 421                 input_abs_set_min(dev, i, user_dev->absmin[i]);
 422                 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
 423                 input_abs_set_flat(dev, i, user_dev->absflat[i]);
 424         }
 425
 426         retval = uinput_validate_absbits(dev);
 427         if (retval < 0)
 428                 goto exit;
 429
 430         udev->state = UIST_SETUP_COMPLETE;
 431         retval = count;
 432
 433  exit:
 434         kfree(user_dev);
 435         return retval;
 436 }
 437
 438 static ssize_t uinput_inject_events(struct uinput_device *udev,
 439                                     const char __user *buffer, size_t count)
 440 {
 441         struct input_event ev;
 442         size_t bytes = 0;
 443
 444         if (count != 0 && count < input_event_size())
 445                 return -EINVAL;
 446
 447         while (bytes + input_event_size() <= count) {
 448                 /*
 449                  * Note that even if some events were fetched successfully
 450                  * we are still going to return EFAULT instead of partial
 451                  * count to let userspace know that it got it's buffers
 452                  * all wrong.
 453                  */
 454                 if (input_event_from_user(buffer + bytes, &ev))
 455                         return -EFAULT;
 456
 457                 input_event(udev->dev, ev.type, ev.code, ev.value);
 458                 bytes += input_event_size();
 459         }
 460
 461         return bytes;
 462 }
 463
 464 static ssize_t uinput_write(struct file *file, const char __user *buffer,
 465                             size_t count, loff_t *ppos)
 466 {
 467         struct uinput_device *udev = file->private_data;
 468         int retval;
 469
 470         if (count == 0)
 471                 return 0;
 472
 473         retval = mutex_lock_interruptible(&udev->mutex);
 474         if (retval)
 475                 return retval;
 476
 477         retval = udev->state == UIST_CREATED ?
 478                         uinput_inject_events(udev, buffer, count) :
 479                         uinput_setup_device(udev, buffer, count);
 480
 481         mutex_unlock(&udev->mutex);
 482
 483         return retval;
 484 }
 485
 486 static bool uinput_fetch_next_event(struct uinput_device *udev,
 487                                     struct input_event *event)
 488 {
 489         bool have_event;
 490
 491         spin_lock_irq(&udev->dev->event_lock);
 492
 493         have_event = udev->head != udev->tail;
 494         if (have_event) {
 495                 *event = udev->buff[udev->tail];
 496                 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
 497         }
 498
 499         spin_unlock_irq(&udev->dev->event_lock);
 500
 501         return have_event;
 502 }
 503
 504 static ssize_t uinput_events_to_user(struct uinput_device *udev,
 505                                      char __user *buffer, size_t count)
 506 {
 507         struct input_event event;
 508         size_t read = 0;
 509
 510         while (read + input_event_size() <= count &&
 511                uinput_fetch_next_event(udev, &event)) {
 512
 513                 if (input_event_to_user(buffer + read, &event))
 514                         return -EFAULT;
 515
 516                 read += input_event_size();
 517         }
 518
 519         return read;
 520 }
 521
 522 static ssize_t uinput_read(struct file *file, char __user *buffer,
 523                            size_t count, loff_t *ppos)
 524 {
 525         struct uinput_device *udev = file->private_data;
 526         ssize_t retval;
 527
 528         if (count != 0 && count < input_event_size())
 529                 return -EINVAL;
 530
 531         do {
 532                 retval = mutex_lock_interruptible(&udev->mutex);
 533                 if (retval)
 534                         return retval;
 535
 536                 if (udev->state != UIST_CREATED)
 537                         retval = -ENODEV;
 538                 else if (udev->head == udev->tail &&
 539                          (file->f_flags & O_NONBLOCK))
 540                         retval = -EAGAIN;
 541                 else
 542                         retval = uinput_events_to_user(udev, buffer, count);
 543
 544                 mutex_unlock(&udev->mutex);
 545
 546                 if (retval || count == 0)
 547                         break;
 548
 549                 if (!(file->f_flags & O_NONBLOCK))
 550                         retval = wait_event_interruptible(udev->waitq,
 551                                                   udev->head != udev->tail ||
 552                                                   udev->state != UIST_CREATED);
 553         } while (retval == 0);
 554
 555         return retval;
 556 }
 557
 558 static unsigned int uinput_poll(struct file *file, poll_table *wait)
 559 {
 560         struct uinput_device *udev = file->private_data;
 561
 562         poll_wait(file, &udev->waitq, wait);
 563
 564         if (udev->head != udev->tail)
 565                 return POLLIN | POLLRDNORM;
 566
 567         return 0;
 568 }
 569
 570 static int uinput_release(struct inode *inode, struct file *file)
 571 {
 572         struct uinput_device *udev = file->private_data;
 573
 574         uinput_destroy_device(udev);
 575         kfree(udev);
 576
 577         return 0;
 578 }
 579
 580 #ifdef CONFIG_COMPAT
 581 struct uinput_ff_upload_compat {
 582         __u32                   request_id;
 583         __s32                   retval;
 584         struct ff_effect_compat effect;
 585         struct ff_effect_compat old;
 586 };
 587
 588 static int uinput_ff_upload_to_user(char __user *buffer,
 589                                     const struct uinput_ff_upload *ff_up)
 590 {
 591         if (INPUT_COMPAT_TEST) {
 592                 struct uinput_ff_upload_compat ff_up_compat;
 593
 594                 ff_up_compat.request_id = ff_up->request_id;
 595                 ff_up_compat.retval = ff_up->retval;
 596                 /*
 597                  * It so happens that the pointer that gives us the trouble
 598                  * is the last field in the structure. Since we don't support
 599                  * custom waveforms in uinput anyway we can just copy the whole
 600                  * thing (to the compat size) and ignore the pointer.
 601                  */
 602                 memcpy(&ff_up_compat.effect, &ff_up->effect,
 603                         sizeof(struct ff_effect_compat));
 604                 memcpy(&ff_up_compat.old, &ff_up->old,
 605                         sizeof(struct ff_effect_compat));
 606
 607                 if (copy_to_user(buffer, &ff_up_compat,
 608                                  sizeof(struct uinput_ff_upload_compat)))
 609                         return -EFAULT;
 610         } else {
 611                 if (copy_to_user(buffer, ff_up,
 612                                  sizeof(struct uinput_ff_upload)))
 613                         return -EFAULT;
 614         }
 615
 616         return 0;
 617 }
 618
 619 static int uinput_ff_upload_from_user(const char __user *buffer,
 620                                       struct uinput_ff_upload *ff_up)
 621 {
 622         if (INPUT_COMPAT_TEST) {
 623                 struct uinput_ff_upload_compat ff_up_compat;
 624
 625                 if (copy_from_user(&ff_up_compat, buffer,
 626                                    sizeof(struct uinput_ff_upload_compat)))
 627                         return -EFAULT;
 628
 629                 ff_up->request_id = ff_up_compat.request_id;
 630                 ff_up->retval = ff_up_compat.retval;
 631                 memcpy(&ff_up->effect, &ff_up_compat.effect,
 632                         sizeof(struct ff_effect_compat));
 633                 memcpy(&ff_up->old, &ff_up_compat.old,
 634                         sizeof(struct ff_effect_compat));
 635
 636         } else {
 637                 if (copy_from_user(ff_up, buffer,
 638                                    sizeof(struct uinput_ff_upload)))
 639                         return -EFAULT;
 640         }
 641
 642         return 0;
 643 }
 644
 645 #else
 646
 647 static int uinput_ff_upload_to_user(char __user *buffer,
 648                                     const struct uinput_ff_upload *ff_up)
 649 {
 650         if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
 651                 return -EFAULT;
 652
 653         return 0;
 654 }
 655
 656 static int uinput_ff_upload_from_user(const char __user *buffer,
 657                                       struct uinput_ff_upload *ff_up)
 658 {
 659         if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
 660                 return -EFAULT;
 661
 662         return 0;
 663 }
 664
 665 #endif
 666
 667 #define uinput_set_bit(_arg, _bit, _max)                \
 668 ({                                                      \
 669         int __ret = 0;                                  \
 670         if (udev->state == UIST_CREATED)                \
 671                 __ret =  -EINVAL;                       \
 672         else if ((_arg) > (_max))                       \
 673                 __ret = -EINVAL;                        \
 674         else set_bit((_arg), udev->dev->_bit);          \
 675         __ret;                                          \
 676 })
 677
 678 static int uinput_str_to_user(void __user *dest, const char *str,
 679                               unsigned int maxlen)
 680 {
 681         char __user *p = dest;
 682         int len, ret;
 683
 684         if (!str)
 685                 return -ENOENT;
 686
 687         if (maxlen == 0)
 688                 return -EINVAL;
 689
 690         len = strlen(str) + 1;
 691         if (len > maxlen)
 692                 len = maxlen;
 693
 694         ret = copy_to_user(p, str, len);
 695         if (ret)
 696                 return -EFAULT;
 697
 698         /* force terminating '\0' */
 699         ret = put_user(0, p + len - 1);
 700         return ret ? -EFAULT : len;
 701 }
 702
 703 static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
 704                                  unsigned long arg, void __user *p)
 705 {
 706         int                     retval;
 707         struct uinput_device    *udev = file->private_data;
 708         struct uinput_ff_upload ff_up;
 709         struct uinput_ff_erase  ff_erase;
 710         struct uinput_request   *req;
 711         char                    *phys;
 712         const char              *name;
 713         unsigned int            size;
 714
 715         retval = mutex_lock_interruptible(&udev->mutex);
 716         if (retval)
 717                 return retval;
 718
 719         if (!udev->dev) {
 720                 retval = uinput_allocate_device(udev);
 721                 if (retval)
 722                         goto out;
 723         }
 724
 725         switch (cmd) {
 726                 case UI_GET_VERSION:
 727                         if (put_user(UINPUT_VERSION,
 728                                      (unsigned int __user *)p))
 729                                 retval = -EFAULT;
 730                         goto out;
 731
 732                 case UI_DEV_CREATE:
 733                         retval = uinput_create_device(udev);
 734                         goto out;
 735
 736                 case UI_DEV_DESTROY:
 737                         uinput_destroy_device(udev);
 738                         goto out;
 739
 740                 case UI_SET_EVBIT:
 741                         retval = uinput_set_bit(arg, evbit, EV_MAX);
 742                         goto out;
 743
 744                 case UI_SET_KEYBIT:
 745                         retval = uinput_set_bit(arg, keybit, KEY_MAX);
 746                         goto out;
 747
 748                 case UI_SET_RELBIT:
 749                         retval = uinput_set_bit(arg, relbit, REL_MAX);
 750                         goto out;
 751
 752                 case UI_SET_ABSBIT:
 753                         retval = uinput_set_bit(arg, absbit, ABS_MAX);
 754                         goto out;
 755
 756                 case UI_SET_MSCBIT:
 757                         retval = uinput_set_bit(arg, mscbit, MSC_MAX);
 758                         goto out;
 759
 760                 case UI_SET_LEDBIT:
 761                         retval = uinput_set_bit(arg, ledbit, LED_MAX);
 762                         goto out;
 763
 764                 case UI_SET_SNDBIT:
 765                         retval = uinput_set_bit(arg, sndbit, SND_MAX);
 766                         goto out;
 767
 768                 case UI_SET_FFBIT:
 769                         retval = uinput_set_bit(arg, ffbit, FF_MAX);
 770                         goto out;
 771
 772                 case UI_SET_SWBIT:
 773                         retval = uinput_set_bit(arg, swbit, SW_MAX);
 774                         goto out;
 775
 776                 case UI_SET_PROPBIT:
 777                         retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
 778                         goto out;
 779
 780                 case UI_SET_PHYS:
 781                         if (udev->state == UIST_CREATED) {
 782                                 retval = -EINVAL;
 783                                 goto out;
 784                         }
 785
 786                         phys = strndup_user(p, 1024);
 787                         if (IS_ERR(phys)) {
 788                                 retval = PTR_ERR(phys);
 789                                 goto out;
 790                         }
 791
 792                         kfree(udev->dev->phys);
 793                         udev->dev->phys = phys;
 794                         goto out;
 795
 796                 case UI_BEGIN_FF_UPLOAD:
 797                         retval = uinput_ff_upload_from_user(p, &ff_up);
 798                         if (retval)
 799                                 goto out;
 800
 801                         req = uinput_request_find(udev, ff_up.request_id);
 802                         if (!req || req->code != UI_FF_UPLOAD ||
 803                             !req->u.upload.effect) {
 804                                 retval = -EINVAL;
 805                                 goto out;
 806                         }
 807
 808                         ff_up.retval = 0;
 809                         ff_up.effect = *req->u.upload.effect;
 810                         if (req->u.upload.old)
 811                                 ff_up.old = *req->u.upload.old;
 812                         else
 813                                 memset(&ff_up.old, 0, sizeof(struct ff_effect));
 814
 815                         retval = uinput_ff_upload_to_user(p, &ff_up);
 816                         goto out;
 817
 818                 case UI_BEGIN_FF_ERASE:
 819                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 820                                 retval = -EFAULT;
 821                                 goto out;
 822                         }
 823
 824                         req = uinput_request_find(udev, ff_erase.request_id);
 825                         if (!req || req->code != UI_FF_ERASE) {
 826                                 retval = -EINVAL;
 827                                 goto out;
 828                         }
 829
 830                         ff_erase.retval = 0;
 831                         ff_erase.effect_id = req->u.effect_id;
 832                         if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
 833                                 retval = -EFAULT;
 834                                 goto out;
 835                         }
 836
 837                         goto out;
 838
 839                 case UI_END_FF_UPLOAD:
 840                         retval = uinput_ff_upload_from_user(p, &ff_up);
 841                         if (retval)
 842                                 goto out;
 843
 844                         req = uinput_request_find(udev, ff_up.request_id);
 845                         if (!req || req->code != UI_FF_UPLOAD ||
 846                             !req->u.upload.effect) {
 847                                 retval = -EINVAL;
 848                                 goto out;
 849                         }
 850
 851                         req->retval = ff_up.retval;
 852                         uinput_request_done(udev, req);
 853                         goto out;
 854
 855                 case UI_END_FF_ERASE:
 856                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 857                                 retval = -EFAULT;
 858                                 goto out;
 859                         }
 860
 861                         req = uinput_request_find(udev, ff_erase.request_id);
 862                         if (!req || req->code != UI_FF_ERASE) {
 863                                 retval = -EINVAL;
 864                                 goto out;
 865                         }
 866
 867                         req->retval = ff_erase.retval;
 868                         uinput_request_done(udev, req);
 869                         goto out;
 870         }
 871
 872         size = _IOC_SIZE(cmd);
 873
 874         /* Now check variable-length commands */
 875         switch (cmd & ~IOCSIZE_MASK) {
 876         case UI_GET_SYSNAME(0):
 877                 if (udev->state != UIST_CREATED) {
 878                         retval = -ENOENT;
 879                         goto out;
 880                 }
 881                 name = dev_name(&udev->dev->dev);
 882                 retval = uinput_str_to_user(p, name, size);
 883                 goto out;
 884         }
 885
 886         retval = -EINVAL;
 887  out:
 888         mutex_unlock(&udev->mutex);
 889         return retval;
 890 }
 891
 892 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 893 {
 894         return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
 895 }
 896
 897 #ifdef CONFIG_COMPAT
 898 static long uinput_compat_ioctl(struct file *file,
 899                                 unsigned int cmd, unsigned long arg)
 900 {
 901         return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
 902 }
 903 #endif
 904
 905 static const struct file_operations uinput_fops = {
 906         .owner          = THIS_MODULE,
 907         .open           = uinput_open,
 908         .release        = uinput_release,
 909         .read           = uinput_read,
 910         .write          = uinput_write,
 911         .poll           = uinput_poll,
 912         .unlocked_ioctl = uinput_ioctl,
 913 #ifdef CONFIG_COMPAT
 914         .compat_ioctl   = uinput_compat_ioctl,
 915 #endif
 916         .llseek         = no_llseek,
 917 };
 918
 919 static struct miscdevice uinput_misc = {
 920         .fops           = &uinput_fops,
 921         .minor          = UINPUT_MINOR,
 922         .name           = UINPUT_NAME,
 923 };
 924 MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
 925 MODULE_ALIAS("devname:" UINPUT_NAME);
 926
 927 static int __init uinput_init(void)
 928 {
 929         return misc_register(&uinput_misc);
 930 }
 931
 932 static void __exit uinput_exit(void)
 933 {
 934         misc_deregister(&uinput_misc);
 935 }
 936
 937 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
 938 MODULE_DESCRIPTION("User level driver support for input subsystem");
 939 MODULE_LICENSE("GPL");
 940 MODULE_VERSION("0.3");
 941
 942 module_init(uinput_init);
 943 module_exit(uinput_exit);