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 <[email protected]>
  21  *
  22  * Changes/Revisions:
  23  *      0.4     01/09/2014 (Benjamin Tissoires <[email protected]>)
  24  *              - add UI_GET_SYSNAME ioctl
  25  *      0.3     09/04/2006 (Anssi Hannula <[email protected]>)
  26  *              - updated ff support for the changes in kernel interface
  27  *              - added MODULE_VERSION
  28  *      0.2     16/10/2004 (Micah Dowty <[email protected]>)
  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 retval = 0;
 315
 316         for (cnt = 0; cnt < ABS_CNT; cnt++) {
 317                 int min, max;
 318                 if (!test_bit(cnt, dev->absbit))
 319                         continue;
 320
 321                 min = input_abs_get_min(dev, cnt);
 322                 max = input_abs_get_max(dev, cnt);
 323
 324                 if ((min != 0 || max != 0) && max <= min) {
 325                         printk(KERN_DEBUG
 326                                 "%s: invalid abs[%02x] min:%d max:%d\n",
 327                                 UINPUT_NAME, cnt,
 328                                 input_abs_get_min(dev, cnt),
 329                                 input_abs_get_max(dev, cnt));
 330                         retval = -EINVAL;
 331                         break;
 332                 }
 333
 334                 if (input_abs_get_flat(dev, cnt) >
 335                     input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) {
 336                         printk(KERN_DEBUG
 337                                 "%s: abs_flat #%02x out of range: %d "
 338                                 "(min:%d/max:%d)\n",
 339                                 UINPUT_NAME, cnt,
 340                                 input_abs_get_flat(dev, cnt),
 341                                 input_abs_get_min(dev, cnt),
 342                                 input_abs_get_max(dev, cnt));
 343                         retval = -EINVAL;
 344                         break;
 345                 }
 346         }
 347         return retval;
 348 }
 349
 350 static int uinput_allocate_device(struct uinput_device *udev)
 351 {
 352         udev->dev = input_allocate_device();
 353         if (!udev->dev)
 354                 return -ENOMEM;
 355
 356         udev->dev->event = uinput_dev_event;
 357         input_set_drvdata(udev->dev, udev);
 358
 359         return 0;
 360 }
 361
 362 static int uinput_setup_device(struct uinput_device *udev,
 363                                const char __user *buffer, size_t count)
 364 {
 365         struct uinput_user_dev  *user_dev;
 366         struct input_dev        *dev;
 367         int                     i;
 368         int                     retval;
 369
 370         if (count != sizeof(struct uinput_user_dev))
 371                 return -EINVAL;
 372
 373         if (!udev->dev) {
 374                 retval = uinput_allocate_device(udev);
 375                 if (retval)
 376                         return retval;
 377         }
 378
 379         dev = udev->dev;
 380
 381         user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
 382         if (IS_ERR(user_dev))
 383                 return PTR_ERR(user_dev);
 384
 385         udev->ff_effects_max = user_dev->ff_effects_max;
 386
 387         /* Ensure name is filled in */
 388         if (!user_dev->name[0]) {
 389                 retval = -EINVAL;
 390                 goto exit;
 391         }
 392
 393         kfree(dev->name);
 394         dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
 395                              GFP_KERNEL);
 396         if (!dev->name) {
 397                 retval = -ENOMEM;
 398                 goto exit;
 399         }
 400
 401         dev->id.bustype = user_dev->id.bustype;
 402         dev->id.vendor  = user_dev->id.vendor;
 403         dev->id.product = user_dev->id.product;
 404         dev->id.version = user_dev->id.version;
 405
 406         for (i = 0; i < ABS_CNT; i++) {
 407                 input_abs_set_max(dev, i, user_dev->absmax[i]);
 408                 input_abs_set_min(dev, i, user_dev->absmin[i]);
 409                 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
 410                 input_abs_set_flat(dev, i, user_dev->absflat[i]);
 411         }
 412
 413         /* check if absmin/absmax/absfuzz/absflat are filled as
 414          * told in Documentation/input/input-programming.txt */
 415         if (test_bit(EV_ABS, dev->evbit)) {
 416                 retval = uinput_validate_absbits(dev);
 417                 if (retval < 0)
 418                         goto exit;
 419                 if (test_bit(ABS_MT_SLOT, dev->absbit)) {
 420                         int nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
 421                         input_mt_init_slots(dev, nslot, 0);
 422                 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
 423                         input_set_events_per_packet(dev, 60);
 424                 }
 425         }
 426
 427         udev->state = UIST_SETUP_COMPLETE;
 428         retval = count;
 429
 430  exit:
 431         kfree(user_dev);
 432         return retval;
 433 }
 434
 435 static ssize_t uinput_inject_events(struct uinput_device *udev,
 436                                     const char __user *buffer, size_t count)
 437 {
 438         struct input_event ev;
 439         size_t bytes = 0;
 440
 441         if (count != 0 && count < input_event_size())
 442                 return -EINVAL;
 443
 444         while (bytes + input_event_size() <= count) {
 445                 /*
 446                  * Note that even if some events were fetched successfully
 447                  * we are still going to return EFAULT instead of partial
 448                  * count to let userspace know that it got it's buffers
 449                  * all wrong.
 450                  */
 451                 if (input_event_from_user(buffer + bytes, &ev))
 452                         return -EFAULT;
 453
 454                 input_event(udev->dev, ev.type, ev.code, ev.value);
 455                 bytes += input_event_size();
 456         }
 457
 458         return bytes;
 459 }
 460
 461 static ssize_t uinput_write(struct file *file, const char __user *buffer,
 462                             size_t count, loff_t *ppos)
 463 {
 464         struct uinput_device *udev = file->private_data;
 465         int retval;
 466
 467         if (count == 0)
 468                 return 0;
 469
 470         retval = mutex_lock_interruptible(&udev->mutex);
 471         if (retval)
 472                 return retval;
 473
 474         retval = udev->state == UIST_CREATED ?
 475                         uinput_inject_events(udev, buffer, count) :
 476                         uinput_setup_device(udev, buffer, count);
 477
 478         mutex_unlock(&udev->mutex);
 479
 480         return retval;
 481 }
 482
 483 static bool uinput_fetch_next_event(struct uinput_device *udev,
 484                                     struct input_event *event)
 485 {
 486         bool have_event;
 487
 488         spin_lock_irq(&udev->dev->event_lock);
 489
 490         have_event = udev->head != udev->tail;
 491         if (have_event) {
 492                 *event = udev->buff[udev->tail];
 493                 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
 494         }
 495
 496         spin_unlock_irq(&udev->dev->event_lock);
 497
 498         return have_event;
 499 }
 500
 501 static ssize_t uinput_events_to_user(struct uinput_device *udev,
 502                                      char __user *buffer, size_t count)
 503 {
 504         struct input_event event;
 505         size_t read = 0;
 506
 507         while (read + input_event_size() <= count &&
 508                uinput_fetch_next_event(udev, &event)) {
 509
 510                 if (input_event_to_user(buffer + read, &event))
 511                         return -EFAULT;
 512
 513                 read += input_event_size();
 514         }
 515
 516         return read;
 517 }
 518
 519 static ssize_t uinput_read(struct file *file, char __user *buffer,
 520                            size_t count, loff_t *ppos)
 521 {
 522         struct uinput_device *udev = file->private_data;
 523         ssize_t retval;
 524
 525         if (count != 0 && count < input_event_size())
 526                 return -EINVAL;
 527
 528         do {
 529                 retval = mutex_lock_interruptible(&udev->mutex);
 530                 if (retval)
 531                         return retval;
 532
 533                 if (udev->state != UIST_CREATED)
 534                         retval = -ENODEV;
 535                 else if (udev->head == udev->tail &&
 536                          (file->f_flags & O_NONBLOCK))
 537                         retval = -EAGAIN;
 538                 else
 539                         retval = uinput_events_to_user(udev, buffer, count);
 540
 541                 mutex_unlock(&udev->mutex);
 542
 543                 if (retval || count == 0)
 544                         break;
 545
 546                 if (!(file->f_flags & O_NONBLOCK))
 547                         retval = wait_event_interruptible(udev->waitq,
 548                                                   udev->head != udev->tail ||
 549                                                   udev->state != UIST_CREATED);
 550         } while (retval == 0);
 551
 552         return retval;
 553 }
 554
 555 static unsigned int uinput_poll(struct file *file, poll_table *wait)
 556 {
 557         struct uinput_device *udev = file->private_data;
 558
 559         poll_wait(file, &udev->waitq, wait);
 560
 561         if (udev->head != udev->tail)
 562                 return POLLIN | POLLRDNORM;
 563
 564         return 0;
 565 }
 566
 567 static int uinput_release(struct inode *inode, struct file *file)
 568 {
 569         struct uinput_device *udev = file->private_data;
 570
 571         uinput_destroy_device(udev);
 572         kfree(udev);
 573
 574         return 0;
 575 }
 576
 577 #ifdef CONFIG_COMPAT
 578 struct uinput_ff_upload_compat {
 579         __u32                   request_id;
 580         __s32                   retval;
 581         struct ff_effect_compat effect;
 582         struct ff_effect_compat old;
 583 };
 584
 585 static int uinput_ff_upload_to_user(char __user *buffer,
 586                                     const struct uinput_ff_upload *ff_up)
 587 {
 588         if (INPUT_COMPAT_TEST) {
 589                 struct uinput_ff_upload_compat ff_up_compat;
 590
 591                 ff_up_compat.request_id = ff_up->request_id;
 592                 ff_up_compat.retval = ff_up->retval;
 593                 /*
 594                  * It so happens that the pointer that gives us the trouble
 595                  * is the last field in the structure. Since we don't support
 596                  * custom waveforms in uinput anyway we can just copy the whole
 597                  * thing (to the compat size) and ignore the pointer.
 598                  */
 599                 memcpy(&ff_up_compat.effect, &ff_up->effect,
 600                         sizeof(struct ff_effect_compat));
 601                 memcpy(&ff_up_compat.old, &ff_up->old,
 602                         sizeof(struct ff_effect_compat));
 603
 604                 if (copy_to_user(buffer, &ff_up_compat,
 605                                  sizeof(struct uinput_ff_upload_compat)))
 606                         return -EFAULT;
 607         } else {
 608                 if (copy_to_user(buffer, ff_up,
 609                                  sizeof(struct uinput_ff_upload)))
 610                         return -EFAULT;
 611         }
 612
 613         return 0;
 614 }
 615
 616 static int uinput_ff_upload_from_user(const char __user *buffer,
 617                                       struct uinput_ff_upload *ff_up)
 618 {
 619         if (INPUT_COMPAT_TEST) {
 620                 struct uinput_ff_upload_compat ff_up_compat;
 621
 622                 if (copy_from_user(&ff_up_compat, buffer,
 623                                    sizeof(struct uinput_ff_upload_compat)))
 624                         return -EFAULT;
 625
 626                 ff_up->request_id = ff_up_compat.request_id;
 627                 ff_up->retval = ff_up_compat.retval;
 628                 memcpy(&ff_up->effect, &ff_up_compat.effect,
 629                         sizeof(struct ff_effect_compat));
 630                 memcpy(&ff_up->old, &ff_up_compat.old,
 631                         sizeof(struct ff_effect_compat));
 632
 633         } else {
 634                 if (copy_from_user(ff_up, buffer,
 635                                    sizeof(struct uinput_ff_upload)))
 636                         return -EFAULT;
 637         }
 638
 639         return 0;
 640 }
 641
 642 #else
 643
 644 static int uinput_ff_upload_to_user(char __user *buffer,
 645                                     const struct uinput_ff_upload *ff_up)
 646 {
 647         if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
 648                 return -EFAULT;
 649
 650         return 0;
 651 }
 652
 653 static int uinput_ff_upload_from_user(const char __user *buffer,
 654                                       struct uinput_ff_upload *ff_up)
 655 {
 656         if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
 657                 return -EFAULT;
 658
 659         return 0;
 660 }
 661
 662 #endif
 663
 664 #define uinput_set_bit(_arg, _bit, _max)                \
 665 ({                                                      \
 666         int __ret = 0;                                  \
 667         if (udev->state == UIST_CREATED)                \
 668                 __ret =  -EINVAL;                       \
 669         else if ((_arg) > (_max))                       \
 670                 __ret = -EINVAL;                        \
 671         else set_bit((_arg), udev->dev->_bit);          \
 672         __ret;                                          \
 673 })
 674
 675 static int uinput_str_to_user(void __user *dest, const char *str,
 676                               unsigned int maxlen)
 677 {
 678         char __user *p = dest;
 679         int len, ret;
 680
 681         if (!str)
 682                 return -ENOENT;
 683
 684         if (maxlen == 0)
 685                 return -EINVAL;
 686
 687         len = strlen(str) + 1;
 688         if (len > maxlen)
 689                 len = maxlen;
 690
 691         ret = copy_to_user(p, str, len);
 692         if (ret)
 693                 return -EFAULT;
 694
 695         /* force terminating '\0' */
 696         ret = put_user(0, p + len - 1);
 697         return ret ? -EFAULT : len;
 698 }
 699
 700 static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
 701                                  unsigned long arg, void __user *p)
 702 {
 703         int                     retval;
 704         struct uinput_device    *udev = file->private_data;
 705         struct uinput_ff_upload ff_up;
 706         struct uinput_ff_erase  ff_erase;
 707         struct uinput_request   *req;
 708         char                    *phys;
 709         const char              *name;
 710         unsigned int            size;
 711
 712         retval = mutex_lock_interruptible(&udev->mutex);
 713         if (retval)
 714                 return retval;
 715
 716         if (!udev->dev) {
 717                 retval = uinput_allocate_device(udev);
 718                 if (retval)
 719                         goto out;
 720         }
 721
 722         switch (cmd) {
 723                 case UI_DEV_CREATE:
 724                         retval = uinput_create_device(udev);
 725                         goto out;
 726
 727                 case UI_DEV_DESTROY:
 728                         uinput_destroy_device(udev);
 729                         goto out;
 730
 731                 case UI_SET_EVBIT:
 732                         retval = uinput_set_bit(arg, evbit, EV_MAX);
 733                         goto out;
 734
 735                 case UI_SET_KEYBIT:
 736                         retval = uinput_set_bit(arg, keybit, KEY_MAX);
 737                         goto out;
 738
 739                 case UI_SET_RELBIT:
 740                         retval = uinput_set_bit(arg, relbit, REL_MAX);
 741                         goto out;
 742
 743                 case UI_SET_ABSBIT:
 744                         retval = uinput_set_bit(arg, absbit, ABS_MAX);
 745                         goto out;
 746
 747                 case UI_SET_MSCBIT:
 748                         retval = uinput_set_bit(arg, mscbit, MSC_MAX);
 749                         goto out;
 750
 751                 case UI_SET_LEDBIT:
 752                         retval = uinput_set_bit(arg, ledbit, LED_MAX);
 753                         goto out;
 754
 755                 case UI_SET_SNDBIT:
 756                         retval = uinput_set_bit(arg, sndbit, SND_MAX);
 757                         goto out;
 758
 759                 case UI_SET_FFBIT:
 760                         retval = uinput_set_bit(arg, ffbit, FF_MAX);
 761                         goto out;
 762
 763                 case UI_SET_SWBIT:
 764                         retval = uinput_set_bit(arg, swbit, SW_MAX);
 765                         goto out;
 766
 767                 case UI_SET_PROPBIT:
 768                         retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
 769                         goto out;
 770
 771                 case UI_SET_PHYS:
 772                         if (udev->state == UIST_CREATED) {
 773                                 retval = -EINVAL;
 774                                 goto out;
 775                         }
 776
 777                         phys = strndup_user(p, 1024);
 778                         if (IS_ERR(phys)) {
 779                                 retval = PTR_ERR(phys);
 780                                 goto out;
 781                         }
 782
 783                         kfree(udev->dev->phys);
 784                         udev->dev->phys = phys;
 785                         goto out;
 786
 787                 case UI_BEGIN_FF_UPLOAD:
 788                         retval = uinput_ff_upload_from_user(p, &ff_up);
 789                         if (retval)
 790                                 goto out;
 791
 792                         req = uinput_request_find(udev, ff_up.request_id);
 793                         if (!req || req->code != UI_FF_UPLOAD ||
 794                             !req->u.upload.effect) {
 795                                 retval = -EINVAL;
 796                                 goto out;
 797                         }
 798
 799                         ff_up.retval = 0;
 800                         ff_up.effect = *req->u.upload.effect;
 801                         if (req->u.upload.old)
 802                                 ff_up.old = *req->u.upload.old;
 803                         else
 804                                 memset(&ff_up.old, 0, sizeof(struct ff_effect));
 805
 806                         retval = uinput_ff_upload_to_user(p, &ff_up);
 807                         goto out;
 808
 809                 case UI_BEGIN_FF_ERASE:
 810                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 811                                 retval = -EFAULT;
 812                                 goto out;
 813                         }
 814
 815                         req = uinput_request_find(udev, ff_erase.request_id);
 816                         if (!req || req->code != UI_FF_ERASE) {
 817                                 retval = -EINVAL;
 818                                 goto out;
 819                         }
 820
 821                         ff_erase.retval = 0;
 822                         ff_erase.effect_id = req->u.effect_id;
 823                         if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
 824                                 retval = -EFAULT;
 825                                 goto out;
 826                         }
 827
 828                         goto out;
 829
 830                 case UI_END_FF_UPLOAD:
 831                         retval = uinput_ff_upload_from_user(p, &ff_up);
 832                         if (retval)
 833                                 goto out;
 834
 835                         req = uinput_request_find(udev, ff_up.request_id);
 836                         if (!req || req->code != UI_FF_UPLOAD ||
 837                             !req->u.upload.effect) {
 838                                 retval = -EINVAL;
 839                                 goto out;
 840                         }
 841
 842                         req->retval = ff_up.retval;
 843                         uinput_request_done(udev, req);
 844                         goto out;
 845
 846                 case UI_END_FF_ERASE:
 847                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 848                                 retval = -EFAULT;
 849                                 goto out;
 850                         }
 851
 852                         req = uinput_request_find(udev, ff_erase.request_id);
 853                         if (!req || req->code != UI_FF_ERASE) {
 854                                 retval = -EINVAL;
 855                                 goto out;
 856                         }
 857
 858                         req->retval = ff_erase.retval;
 859                         uinput_request_done(udev, req);
 860                         goto out;
 861         }
 862
 863         size = _IOC_SIZE(cmd);
 864
 865         /* Now check variable-length commands */
 866         switch (cmd & ~IOCSIZE_MASK) {
 867         case UI_GET_SYSNAME(0):
 868                 if (udev->state != UIST_CREATED) {
 869                         retval = -ENOENT;
 870                         goto out;
 871                 }
 872                 name = dev_name(&udev->dev->dev);
 873                 retval = uinput_str_to_user(p, name, size);
 874                 goto out;
 875         }
 876
 877         retval = -EINVAL;
 878  out:
 879         mutex_unlock(&udev->mutex);
 880         return retval;
 881 }
 882
 883 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 884 {
 885         return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
 886 }
 887
 888 #ifdef CONFIG_COMPAT
 889 static long uinput_compat_ioctl(struct file *file,
 890                                 unsigned int cmd, unsigned long arg)
 891 {
 892         return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
 893 }
 894 #endif
 895
 896 static const struct file_operations uinput_fops = {
 897         .owner          = THIS_MODULE,
 898         .open           = uinput_open,
 899         .release        = uinput_release,
 900         .read           = uinput_read,
 901         .write          = uinput_write,
 902         .poll           = uinput_poll,
 903         .unlocked_ioctl = uinput_ioctl,
 904 #ifdef CONFIG_COMPAT
 905         .compat_ioctl   = uinput_compat_ioctl,
 906 #endif
 907         .llseek         = no_llseek,
 908 };
 909
 910 static struct miscdevice uinput_misc = {
 911         .fops           = &uinput_fops,
 912         .minor          = UINPUT_MINOR,
 913         .name           = UINPUT_NAME,
 914 };
 915 MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
 916 MODULE_ALIAS("devname:" UINPUT_NAME);
 917
 918 static int __init uinput_init(void)
 919 {
 920         return misc_register(&uinput_misc);
 921 }
 922
 923 static void __exit uinput_exit(void)
 924 {
 925         misc_deregister(&uinput_misc);
 926 }
 927
 928 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
 929 MODULE_DESCRIPTION("User level driver support for input subsystem");
 930 MODULE_LICENSE("GPL");
 931 MODULE_VERSION("0.3");
 932
 933 module_init(uinput_init);
 934 module_exit(uinput_exit);