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