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