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