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         char                    *name;
 351         int                     i, size;
 352         int                     retval;
 353
 354         if (count != sizeof(struct uinput_user_dev))
 355                 return -EINVAL;
 356
 357         if (!udev->dev) {
 358                 retval = uinput_allocate_device(udev);
 359                 if (retval)
 360                         return retval;
 361         }
 362
 363         dev = udev->dev;
 364
 365         user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL);
 366         if (!user_dev)
 367                 return -ENOMEM;
 368
 369         if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) {
 370                 retval = -EFAULT;
 371                 goto exit;
 372         }
 373
 374         udev->ff_effects_max = user_dev->ff_effects_max;
 375
 376         size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1;
 377         if (!size) {
 378                 retval = -EINVAL;
 379                 goto exit;
 380         }
 381
 382         kfree(dev->name);
 383         dev->name = name = kmalloc(size, GFP_KERNEL);
 384         if (!name) {
 385                 retval = -ENOMEM;
 386                 goto exit;
 387         }
 388         strlcpy(name, user_dev->name, size);
 389
 390         dev->id.bustype = user_dev->id.bustype;
 391         dev->id.vendor  = user_dev->id.vendor;
 392         dev->id.product = user_dev->id.product;
 393         dev->id.version = user_dev->id.version;
 394
 395         for (i = 0; i < ABS_CNT; i++) {
 396                 input_abs_set_max(dev, i, user_dev->absmax[i]);
 397                 input_abs_set_min(dev, i, user_dev->absmin[i]);
 398                 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
 399                 input_abs_set_flat(dev, i, user_dev->absflat[i]);
 400         }
 401
 402         /* check if absmin/absmax/absfuzz/absflat are filled as
 403          * told in Documentation/input/input-programming.txt */
 404         if (test_bit(EV_ABS, dev->evbit)) {
 405                 retval = uinput_validate_absbits(dev);
 406                 if (retval < 0)
 407                         goto exit;
 408                 if (test_bit(ABS_MT_SLOT, dev->absbit)) {
 409                         int nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
 410                         input_mt_init_slots(dev, nslot);
 411                 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
 412                         input_set_events_per_packet(dev, 60);
 413                 }
 414         }
 415
 416         udev->state = UIST_SETUP_COMPLETE;
 417         retval = count;
 418
 419  exit:
 420         kfree(user_dev);
 421         return retval;
 422 }
 423
 424 static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count)
 425 {
 426         struct input_event ev;
 427
 428         if (count < input_event_size())
 429                 return -EINVAL;
 430
 431         if (input_event_from_user(buffer, &ev))
 432                 return -EFAULT;
 433
 434         input_event(udev->dev, ev.type, ev.code, ev.value);
 435
 436         return input_event_size();
 437 }
 438
 439 static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 440 {
 441         struct uinput_device *udev = file->private_data;
 442         int retval;
 443
 444         retval = mutex_lock_interruptible(&udev->mutex);
 445         if (retval)
 446                 return retval;
 447
 448         retval = udev->state == UIST_CREATED ?
 449                         uinput_inject_event(udev, buffer, count) :
 450                         uinput_setup_device(udev, buffer, count);
 451
 452         mutex_unlock(&udev->mutex);
 453
 454         return retval;
 455 }
 456
 457 static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 458 {
 459         struct uinput_device *udev = file->private_data;
 460         int retval = 0;
 461
 462         if (udev->state != UIST_CREATED)
 463                 return -ENODEV;
 464
 465         if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
 466                 return -EAGAIN;
 467
 468         retval = wait_event_interruptible(udev->waitq,
 469                         udev->head != udev->tail || udev->state != UIST_CREATED);
 470         if (retval)
 471                 return retval;
 472
 473         retval = mutex_lock_interruptible(&udev->mutex);
 474         if (retval)
 475                 return retval;
 476
 477         if (udev->state != UIST_CREATED) {
 478                 retval = -ENODEV;
 479                 goto out;
 480         }
 481
 482         while (udev->head != udev->tail && retval + input_event_size() <= count) {
 483                 if (input_event_to_user(buffer + retval, &udev->buff[udev->tail])) {
 484                         retval = -EFAULT;
 485                         goto out;
 486                 }
 487                 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
 488                 retval += input_event_size();
 489         }
 490
 491  out:
 492         mutex_unlock(&udev->mutex);
 493
 494         return retval;
 495 }
 496
 497 static unsigned int uinput_poll(struct file *file, poll_table *wait)
 498 {
 499         struct uinput_device *udev = file->private_data;
 500
 501         poll_wait(file, &udev->waitq, wait);
 502
 503         if (udev->head != udev->tail)
 504                 return POLLIN | POLLRDNORM;
 505
 506         return 0;
 507 }
 508
 509 static int uinput_release(struct inode *inode, struct file *file)
 510 {
 511         struct uinput_device *udev = file->private_data;
 512
 513         uinput_destroy_device(udev);
 514         kfree(udev);
 515
 516         return 0;
 517 }
 518
 519 #ifdef CONFIG_COMPAT
 520 struct uinput_ff_upload_compat {
 521         int                     request_id;
 522         int                     retval;
 523         struct ff_effect_compat effect;
 524         struct ff_effect_compat old;
 525 };
 526
 527 static int uinput_ff_upload_to_user(char __user *buffer,
 528                                     const struct uinput_ff_upload *ff_up)
 529 {
 530         if (INPUT_COMPAT_TEST) {
 531                 struct uinput_ff_upload_compat ff_up_compat;
 532
 533                 ff_up_compat.request_id = ff_up->request_id;
 534                 ff_up_compat.retval = ff_up->retval;
 535                 /*
 536                  * It so happens that the pointer that gives us the trouble
 537                  * is the last field in the structure. Since we don't support
 538                  * custom waveforms in uinput anyway we can just copy the whole
 539                  * thing (to the compat size) and ignore the pointer.
 540                  */
 541                 memcpy(&ff_up_compat.effect, &ff_up->effect,
 542                         sizeof(struct ff_effect_compat));
 543                 memcpy(&ff_up_compat.old, &ff_up->old,
 544                         sizeof(struct ff_effect_compat));
 545
 546                 if (copy_to_user(buffer, &ff_up_compat,
 547                                  sizeof(struct uinput_ff_upload_compat)))
 548                         return -EFAULT;
 549         } else {
 550                 if (copy_to_user(buffer, ff_up,
 551                                  sizeof(struct uinput_ff_upload)))
 552                         return -EFAULT;
 553         }
 554
 555         return 0;
 556 }
 557
 558 static int uinput_ff_upload_from_user(const char __user *buffer,
 559                                       struct uinput_ff_upload *ff_up)
 560 {
 561         if (INPUT_COMPAT_TEST) {
 562                 struct uinput_ff_upload_compat ff_up_compat;
 563
 564                 if (copy_from_user(&ff_up_compat, buffer,
 565                                    sizeof(struct uinput_ff_upload_compat)))
 566                         return -EFAULT;
 567
 568                 ff_up->request_id = ff_up_compat.request_id;
 569                 ff_up->retval = ff_up_compat.retval;
 570                 memcpy(&ff_up->effect, &ff_up_compat.effect,
 571                         sizeof(struct ff_effect_compat));
 572                 memcpy(&ff_up->old, &ff_up_compat.old,
 573                         sizeof(struct ff_effect_compat));
 574
 575         } else {
 576                 if (copy_from_user(ff_up, buffer,
 577                                    sizeof(struct uinput_ff_upload)))
 578                         return -EFAULT;
 579         }
 580
 581         return 0;
 582 }
 583
 584 #else
 585
 586 static int uinput_ff_upload_to_user(char __user *buffer,
 587                                     const struct uinput_ff_upload *ff_up)
 588 {
 589         if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
 590                 return -EFAULT;
 591
 592         return 0;
 593 }
 594
 595 static int uinput_ff_upload_from_user(const char __user *buffer,
 596                                       struct uinput_ff_upload *ff_up)
 597 {
 598         if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
 599                 return -EFAULT;
 600
 601         return 0;
 602 }
 603
 604 #endif
 605
 606 #define uinput_set_bit(_arg, _bit, _max)                \
 607 ({                                                      \
 608         int __ret = 0;                                  \
 609         if (udev->state == UIST_CREATED)                \
 610                 __ret =  -EINVAL;                       \
 611         else if ((_arg) > (_max))                       \
 612                 __ret = -EINVAL;                        \
 613         else set_bit((_arg), udev->dev->_bit);          \
 614         __ret;                                          \
 615 })
 616
 617 static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
 618                                  unsigned long arg, void __user *p)
 619 {
 620         int                     retval;
 621         struct uinput_device    *udev = file->private_data;
 622         struct uinput_ff_upload ff_up;
 623         struct uinput_ff_erase  ff_erase;
 624         struct uinput_request   *req;
 625         int                     length;
 626         char                    *phys;
 627
 628         retval = mutex_lock_interruptible(&udev->mutex);
 629         if (retval)
 630                 return retval;
 631
 632         if (!udev->dev) {
 633                 retval = uinput_allocate_device(udev);
 634                 if (retval)
 635                         goto out;
 636         }
 637
 638         switch (cmd) {
 639                 case UI_DEV_CREATE:
 640                         retval = uinput_create_device(udev);
 641                         break;
 642
 643                 case UI_DEV_DESTROY:
 644                         uinput_destroy_device(udev);
 645                         break;
 646
 647                 case UI_SET_EVBIT:
 648                         retval = uinput_set_bit(arg, evbit, EV_MAX);
 649                         break;
 650
 651                 case UI_SET_KEYBIT:
 652                         retval = uinput_set_bit(arg, keybit, KEY_MAX);
 653                         break;
 654
 655                 case UI_SET_RELBIT:
 656                         retval = uinput_set_bit(arg, relbit, REL_MAX);
 657                         break;
 658
 659                 case UI_SET_ABSBIT:
 660                         retval = uinput_set_bit(arg, absbit, ABS_MAX);
 661                         break;
 662
 663                 case UI_SET_MSCBIT:
 664                         retval = uinput_set_bit(arg, mscbit, MSC_MAX);
 665                         break;
 666
 667                 case UI_SET_LEDBIT:
 668                         retval = uinput_set_bit(arg, ledbit, LED_MAX);
 669                         break;
 670
 671                 case UI_SET_SNDBIT:
 672                         retval = uinput_set_bit(arg, sndbit, SND_MAX);
 673                         break;
 674
 675                 case UI_SET_FFBIT:
 676                         retval = uinput_set_bit(arg, ffbit, FF_MAX);
 677                         break;
 678
 679                 case UI_SET_SWBIT:
 680                         retval = uinput_set_bit(arg, swbit, SW_MAX);
 681                         break;
 682
 683                 case UI_SET_PROPBIT:
 684                         retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
 685                         break;
 686
 687                 case UI_SET_PHYS:
 688                         if (udev->state == UIST_CREATED) {
 689                                 retval = -EINVAL;
 690                                 goto out;
 691                         }
 692                         length = strnlen_user(p, 1024);
 693                         if (length <= 0) {
 694                                 retval = -EFAULT;
 695                                 break;
 696                         }
 697                         kfree(udev->dev->phys);
 698                         udev->dev->phys = phys = kmalloc(length, GFP_KERNEL);
 699                         if (!phys) {
 700                                 retval = -ENOMEM;
 701                                 break;
 702                         }
 703                         if (copy_from_user(phys, p, length)) {
 704                                 udev->dev->phys = NULL;
 705                                 kfree(phys);
 706                                 retval = -EFAULT;
 707                                 break;
 708                         }
 709                         phys[length - 1] = '\0';
 710                         break;
 711
 712                 case UI_BEGIN_FF_UPLOAD:
 713                         retval = uinput_ff_upload_from_user(p, &ff_up);
 714                         if (retval)
 715                                 break;
 716
 717                         req = uinput_request_find(udev, ff_up.request_id);
 718                         if (!req || req->code != UI_FF_UPLOAD || !req->u.upload.effect) {
 719                                 retval = -EINVAL;
 720                                 break;
 721                         }
 722
 723                         ff_up.retval = 0;
 724                         ff_up.effect = *req->u.upload.effect;
 725                         if (req->u.upload.old)
 726                                 ff_up.old = *req->u.upload.old;
 727                         else
 728                                 memset(&ff_up.old, 0, sizeof(struct ff_effect));
 729
 730                         retval = uinput_ff_upload_to_user(p, &ff_up);
 731                         break;
 732
 733                 case UI_BEGIN_FF_ERASE:
 734                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 735                                 retval = -EFAULT;
 736                                 break;
 737                         }
 738
 739                         req = uinput_request_find(udev, ff_erase.request_id);
 740                         if (!req || req->code != UI_FF_ERASE) {
 741                                 retval = -EINVAL;
 742                                 break;
 743                         }
 744
 745                         ff_erase.retval = 0;
 746                         ff_erase.effect_id = req->u.effect_id;
 747                         if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
 748                                 retval = -EFAULT;
 749                                 break;
 750                         }
 751
 752                         break;
 753
 754                 case UI_END_FF_UPLOAD:
 755                         retval = uinput_ff_upload_from_user(p, &ff_up);
 756                         if (retval)
 757                                 break;
 758
 759                         req = uinput_request_find(udev, ff_up.request_id);
 760                         if (!req || req->code != UI_FF_UPLOAD ||
 761                             !req->u.upload.effect) {
 762                                 retval = -EINVAL;
 763                                 break;
 764                         }
 765
 766                         req->retval = ff_up.retval;
 767                         uinput_request_done(udev, req);
 768                         break;
 769
 770                 case UI_END_FF_ERASE:
 771                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 772                                 retval = -EFAULT;
 773                                 break;
 774                         }
 775
 776                         req = uinput_request_find(udev, ff_erase.request_id);
 777                         if (!req || req->code != UI_FF_ERASE) {
 778                                 retval = -EINVAL;
 779                                 break;
 780                         }
 781
 782                         req->retval = ff_erase.retval;
 783                         uinput_request_done(udev, req);
 784                         break;
 785
 786                 default:
 787                         retval = -EINVAL;
 788         }
 789
 790  out:
 791         mutex_unlock(&udev->mutex);
 792         return retval;
 793 }
 794
 795 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 796 {
 797         return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
 798 }
 799
 800 #ifdef CONFIG_COMPAT
 801 static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 802 {
 803         return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
 804 }
 805 #endif
 806
 807 static const struct file_operations uinput_fops = {
 808         .owner          = THIS_MODULE,
 809         .open           = uinput_open,
 810         .release        = uinput_release,
 811         .read           = uinput_read,
 812         .write          = uinput_write,
 813         .poll           = uinput_poll,
 814         .unlocked_ioctl = uinput_ioctl,
 815 #ifdef CONFIG_COMPAT
 816         .compat_ioctl   = uinput_compat_ioctl,
 817 #endif
 818         .llseek         = no_llseek,
 819 };
 820
 821 static struct miscdevice uinput_misc = {
 822         .fops           = &uinput_fops,
 823         .minor          = UINPUT_MINOR,
 824         .name           = UINPUT_NAME,
 825 };
 826 MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
 827 MODULE_ALIAS("devname:" UINPUT_NAME);
 828
 829 static int __init uinput_init(void)
 830 {
 831         return misc_register(&uinput_misc);
 832 }
 833
 834 static void __exit uinput_exit(void)
 835 {
 836         misc_deregister(&uinput_misc);
 837 }
 838
 839 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
 840 MODULE_DESCRIPTION("User level driver support for input subsystem");
 841 MODULE_LICENSE("GPL");
 842 MODULE_VERSION("0.3");
 843
 844 module_init(uinput_init);
 845 module_exit(uinput_exit);
 846