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