drivers/input/misc/uinput.c

   1 /*
   2  *  User level driver support for input subsystem
   3  *
   4  * Heavily based on evdev.c by Vojtech Pavlik
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
  21  *
  22  * Changes/Revisions:
  23  *      0.4     01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>)
  24  *              - add UI_GET_SYSNAME ioctl
  25  *      0.3     09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>)
  26  *              - updated ff support for the changes in kernel interface
  27  *              - added MODULE_VERSION
  28  *      0.2     16/10/2004 (Micah Dowty <micah@navi.cx>)
  29  *              - added force feedback support
  30  *              - added UI_SET_PHYS
  31  *      0.1     20/06/2002
  32  *              - first public version
  33  */
  34 #include <linux/poll.h>
  35 #include <linux/sched.h>
  36 #include <linux/slab.h>
  37 #include <linux/module.h>
  38 #include <linux/init.h>
  39 #include <linux/fs.h>
  40 #include <linux/miscdevice.h>
  41 #include <linux/uinput.h>
  42 #include <linux/input/mt.h>
  43 #include "../input-compat.h"
  44
  45 static int uinput_dev_event(struct input_dev *dev,
  46                             unsigned int type, unsigned int code, int value)
  47 {
  48         struct uinput_device    *udev = input_get_drvdata(dev);
  49
  50         udev->buff[udev->head].type = type;
  51         udev->buff[udev->head].code = code;
  52         udev->buff[udev->head].value = value;
  53         do_gettimeofday(&udev->buff[udev->head].time);
  54         udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
  55
  56         wake_up_interruptible(&udev->waitq);
  57
  58         return 0;
  59 }
  60
  61 /* Atomically allocate an ID for the given request. Returns 0 on success. */
  62 static bool uinput_request_alloc_id(struct uinput_device *udev,
  63                                     struct uinput_request *request)
  64 {
  65         unsigned int id;
  66         bool reserved = false;
  67
  68         spin_lock(&udev->requests_lock);
  69
  70         for (id = 0; id < UINPUT_NUM_REQUESTS; id++) {
  71                 if (!udev->requests[id]) {
  72                         request->id = id;
  73                         udev->requests[id] = request;
  74                         reserved = true;
  75                         break;
  76                 }
  77         }
  78
  79         spin_unlock(&udev->requests_lock);
  80         return reserved;
  81 }
  82
  83 static struct uinput_request *uinput_request_find(struct uinput_device *udev,
  84                                                   unsigned int id)
  85 {
  86         /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
  87         if (id >= UINPUT_NUM_REQUESTS)
  88                 return NULL;
  89
  90         return udev->requests[id];
  91 }
  92
  93 static int uinput_request_reserve_slot(struct uinput_device *udev,
  94                                        struct uinput_request *request)
  95 {
  96         /* Allocate slot. If none are available right away, wait. */
  97         return wait_event_interruptible(udev->requests_waitq,
  98                                         uinput_request_alloc_id(udev, request));
  99 }
 100
 101 static void uinput_request_release_slot(struct uinput_device *udev,
 102                                         unsigned int id)
 103 {
 104         /* Mark slot as available */
 105         spin_lock(&udev->requests_lock);
 106         udev->requests[id] = NULL;
 107         spin_unlock(&udev->requests_lock);
 108
 109         wake_up(&udev->requests_waitq);
 110 }
 111
 112 static int uinput_request_send(struct uinput_device *udev,
 113                                struct uinput_request *request)
 114 {
 115         int retval;
 116
 117         retval = mutex_lock_interruptible(&udev->mutex);
 118         if (retval)
 119                 return retval;
 120
 121         if (udev->state != UIST_CREATED) {
 122                 retval = -ENODEV;
 123                 goto out;
 124         }
 125
 126         init_completion(&request->done);
 127
 128         /*
 129          * Tell our userspace application about this new request
 130          * by queueing an input event.
 131          */
 132         uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
 133
 134  out:
 135         mutex_unlock(&udev->mutex);
 136         return retval;
 137 }
 138
 139 static int uinput_request_submit(struct uinput_device *udev,
 140                                  struct uinput_request *request)
 141 {
 142         int retval;
 143
 144         retval = uinput_request_reserve_slot(udev, request);
 145         if (retval)
 146                 return retval;
 147
 148         retval = uinput_request_send(udev, request);
 149         if (retval)
 150                 goto out;
 151
 152         wait_for_completion(&request->done);
 153         retval = request->retval;
 154
 155  out:
 156         uinput_request_release_slot(udev, request->id);
 157         return retval;
 158 }
 159
 160 /*
 161  * Fail all outstanding requests so handlers don't wait for the userspace
 162  * to finish processing them.
 163  */
 164 static void uinput_flush_requests(struct uinput_device *udev)
 165 {
 166         struct uinput_request *request;
 167         int i;
 168
 169         spin_lock(&udev->requests_lock);
 170
 171         for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
 172                 request = udev->requests[i];
 173                 if (request) {
 174                         request->retval = -ENODEV;
 175                         complete(&request->done);
 176                 }
 177         }
 178
 179         spin_unlock(&udev->requests_lock);
 180 }
 181
 182 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
 183 {
 184         uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
 185 }
 186
 187 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
 188 {
 189         uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
 190 }
 191
 192 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
 193 {
 194         return uinput_dev_event(dev, EV_FF, effect_id, value);
 195 }
 196
 197 static int uinput_dev_upload_effect(struct input_dev *dev,
 198                                     struct ff_effect *effect,
 199                                     struct ff_effect *old)
 200 {
 201         struct uinput_device *udev = input_get_drvdata(dev);
 202         struct uinput_request request;
 203
 204         /*
 205          * uinput driver does not currently support periodic effects with
 206          * custom waveform since it does not have a way to pass buffer of
 207          * samples (custom_data) to userspace. If ever there is a device
 208          * supporting custom waveforms we would need to define an additional
 209          * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
 210          */
 211         if (effect->type == FF_PERIODIC &&
 212                         effect->u.periodic.waveform == FF_CUSTOM)
 213                 return -EINVAL;
 214
 215         request.code = UI_FF_UPLOAD;
 216         request.u.upload.effect = effect;
 217         request.u.upload.old = old;
 218
 219         return uinput_request_submit(udev, &request);
 220 }
 221
 222 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
 223 {
 224         struct uinput_device *udev = input_get_drvdata(dev);
 225         struct uinput_request request;
 226
 227         if (!test_bit(EV_FF, dev->evbit))
 228                 return -ENOSYS;
 229
 230         request.code = UI_FF_ERASE;
 231         request.u.effect_id = effect_id;
 232
 233         return uinput_request_submit(udev, &request);
 234 }
 235
 236 static int uinput_dev_flush(struct input_dev *dev, struct file *file)
 237 {
 238         /*
 239          * If we are called with file == NULL that means we are tearing
 240          * down the device, and therefore we can not handle FF erase
 241          * requests: either we are handling UI_DEV_DESTROY (and holding
 242          * the udev->mutex), or the file descriptor is closed and there is
 243          * nobody on the other side anymore.
 244          */
 245         return file ? input_ff_flush(dev, file) : 0;
 246 }
 247
 248 static void uinput_destroy_device(struct uinput_device *udev)
 249 {
 250         const char *name, *phys;
 251         struct input_dev *dev = udev->dev;
 252         enum uinput_state old_state = udev->state;
 253
 254         udev->state = UIST_NEW_DEVICE;
 255
 256         if (dev) {
 257                 name = dev->name;
 258                 phys = dev->phys;
 259                 if (old_state == UIST_CREATED) {
 260                         uinput_flush_requests(udev);
 261                         input_unregister_device(dev);
 262                 } else {
 263                         input_free_device(dev);
 264                 }
 265                 kfree(name);
 266                 kfree(phys);
 267                 udev->dev = NULL;
 268         }
 269 }
 270
 271 static int uinput_create_device(struct uinput_device *udev)
 272 {
 273         struct input_dev *dev = udev->dev;
 274         int error, nslot;
 275
 276         if (udev->state != UIST_SETUP_COMPLETE) {
 277                 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
 278                 return -EINVAL;
 279         }
 280
 281         if (test_bit(EV_ABS, dev->evbit)) {
 282                 input_alloc_absinfo(dev);
 283                 if (!dev->absinfo) {
 284                         error = -EINVAL;
 285                         goto fail1;
 286                 }
 287
 288                 if (test_bit(ABS_MT_SLOT, dev->absbit)) {
 289                         nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
 290                         error = input_mt_init_slots(dev, nslot, 0);
 291                         if (error)
 292                                 goto fail1;
 293                 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
 294                         input_set_events_per_packet(dev, 60);
 295                 }
 296         }
 297
 298         if (test_bit(EV_FF, dev->evbit) && !udev->ff_effects_max) {
 299                 printk(KERN_DEBUG "%s: ff_effects_max should be non-zero when FF_BIT is set\n",
 300                         UINPUT_NAME);
 301                 error = -EINVAL;
 302                 goto fail1;
 303         }
 304
 305         if (udev->ff_effects_max) {
 306                 error = input_ff_create(dev, udev->ff_effects_max);
 307                 if (error)
 308                         goto fail1;
 309
 310                 dev->ff->upload = uinput_dev_upload_effect;
 311                 dev->ff->erase = uinput_dev_erase_effect;
 312                 dev->ff->playback = uinput_dev_playback;
 313                 dev->ff->set_gain = uinput_dev_set_gain;
 314                 dev->ff->set_autocenter = uinput_dev_set_autocenter;
 315                 /*
 316                  * The standard input_ff_flush() implementation does
 317                  * not quite work for uinput as we can't reasonably
 318                  * handle FF requests during device teardown.
 319                  */
 320                 dev->flush = uinput_dev_flush;
 321         }
 322
 323         error = input_register_device(udev->dev);
 324         if (error)
 325                 goto fail2;
 326
 327         udev->state = UIST_CREATED;
 328
 329         return 0;
 330
 331  fail2: input_ff_destroy(dev);
 332  fail1: uinput_destroy_device(udev);
 333         return error;
 334 }
 335
 336 static int uinput_open(struct inode *inode, struct file *file)
 337 {
 338         struct uinput_device *newdev;
 339
 340         newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
 341         if (!newdev)
 342                 return -ENOMEM;
 343
 344         mutex_init(&newdev->mutex);
 345         spin_lock_init(&newdev->requests_lock);
 346         init_waitqueue_head(&newdev->requests_waitq);
 347         init_waitqueue_head(&newdev->waitq);
 348         newdev->state = UIST_NEW_DEVICE;
 349
 350         file->private_data = newdev;
 351         nonseekable_open(inode, file);
 352
 353         return 0;
 354 }
 355
 356 static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code,
 357                                    const struct input_absinfo *abs)
 358 {
 359         int min, max;
 360
 361         min = abs->minimum;
 362         max = abs->maximum;
 363
 364         if ((min != 0 || max != 0) && max <= min) {
 365                 printk(KERN_DEBUG
 366                        "%s: invalid abs[%02x] min:%d max:%d\n",
 367                        UINPUT_NAME, code, min, max);
 368                 return -EINVAL;
 369         }
 370
 371         if (abs->flat > max - min) {
 372                 printk(KERN_DEBUG
 373                        "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n",
 374                        UINPUT_NAME, code, abs->flat, min, max);
 375                 return -EINVAL;
 376         }
 377
 378         return 0;
 379 }
 380
 381 static int uinput_validate_absbits(struct input_dev *dev)
 382 {
 383         unsigned int cnt;
 384         int error;
 385
 386         if (!test_bit(EV_ABS, dev->evbit))
 387                 return 0;
 388
 389         /*
 390          * Check if absmin/absmax/absfuzz/absflat are sane.
 391          */
 392
 393         for_each_set_bit(cnt, dev->absbit, ABS_CNT) {
 394                 if (!dev->absinfo)
 395                         return -EINVAL;
 396
 397                 error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]);
 398                 if (error)
 399                         return error;
 400         }
 401
 402         return 0;
 403 }
 404
 405 static int uinput_allocate_device(struct uinput_device *udev)
 406 {
 407         udev->dev = input_allocate_device();
 408         if (!udev->dev)
 409                 return -ENOMEM;
 410
 411         udev->dev->event = uinput_dev_event;
 412         input_set_drvdata(udev->dev, udev);
 413
 414         return 0;
 415 }
 416
 417 static int uinput_dev_setup(struct uinput_device *udev,
 418                             struct uinput_setup __user *arg)
 419 {
 420         struct uinput_setup setup;
 421         struct input_dev *dev;
 422
 423         if (udev->state == UIST_CREATED)
 424                 return -EINVAL;
 425
 426         if (copy_from_user(&setup, arg, sizeof(setup)))
 427                 return -EFAULT;
 428
 429         if (!setup.name[0])
 430                 return -EINVAL;
 431
 432         dev = udev->dev;
 433         dev->id = setup.id;
 434         udev->ff_effects_max = setup.ff_effects_max;
 435
 436         kfree(dev->name);
 437         dev->name = kstrndup(setup.name, UINPUT_MAX_NAME_SIZE, GFP_KERNEL);
 438         if (!dev->name)
 439                 return -ENOMEM;
 440
 441         udev->state = UIST_SETUP_COMPLETE;
 442         return 0;
 443 }
 444
 445 static int uinput_abs_setup(struct uinput_device *udev,
 446                             struct uinput_setup __user *arg, size_t size)
 447 {
 448         struct uinput_abs_setup setup = {};
 449         struct input_dev *dev;
 450         int error;
 451
 452         if (size > sizeof(setup))
 453                 return -E2BIG;
 454
 455         if (udev->state == UIST_CREATED)
 456                 return -EINVAL;
 457
 458         if (copy_from_user(&setup, arg, size))
 459                 return -EFAULT;
 460
 461         if (setup.code > ABS_MAX)
 462                 return -ERANGE;
 463
 464         dev = udev->dev;
 465
 466         error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo);
 467         if (error)
 468                 return error;
 469
 470         input_alloc_absinfo(dev);
 471         if (!dev->absinfo)
 472                 return -ENOMEM;
 473
 474         set_bit(setup.code, dev->absbit);
 475         dev->absinfo[setup.code] = setup.absinfo;
 476         return 0;
 477 }
 478
 479 /* legacy setup via write() */
 480 static int uinput_setup_device_legacy(struct uinput_device *udev,
 481                                       const char __user *buffer, size_t count)
 482 {
 483         struct uinput_user_dev  *user_dev;
 484         struct input_dev        *dev;
 485         int                     i;
 486         int                     retval;
 487
 488         if (count != sizeof(struct uinput_user_dev))
 489                 return -EINVAL;
 490
 491         if (!udev->dev) {
 492                 retval = uinput_allocate_device(udev);
 493                 if (retval)
 494                         return retval;
 495         }
 496
 497         dev = udev->dev;
 498
 499         user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
 500         if (IS_ERR(user_dev))
 501                 return PTR_ERR(user_dev);
 502
 503         udev->ff_effects_max = user_dev->ff_effects_max;
 504
 505         /* Ensure name is filled in */
 506         if (!user_dev->name[0]) {
 507                 retval = -EINVAL;
 508                 goto exit;
 509         }
 510
 511         kfree(dev->name);
 512         dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
 513                              GFP_KERNEL);
 514         if (!dev->name) {
 515                 retval = -ENOMEM;
 516                 goto exit;
 517         }
 518
 519         dev->id.bustype = user_dev->id.bustype;
 520         dev->id.vendor  = user_dev->id.vendor;
 521         dev->id.product = user_dev->id.product;
 522         dev->id.version = user_dev->id.version;
 523
 524         for (i = 0; i < ABS_CNT; i++) {
 525                 input_abs_set_max(dev, i, user_dev->absmax[i]);
 526                 input_abs_set_min(dev, i, user_dev->absmin[i]);
 527                 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
 528                 input_abs_set_flat(dev, i, user_dev->absflat[i]);
 529         }
 530
 531         retval = uinput_validate_absbits(dev);
 532         if (retval < 0)
 533                 goto exit;
 534
 535         udev->state = UIST_SETUP_COMPLETE;
 536         retval = count;
 537
 538  exit:
 539         kfree(user_dev);
 540         return retval;
 541 }
 542
 543 static ssize_t uinput_inject_events(struct uinput_device *udev,
 544                                     const char __user *buffer, size_t count)
 545 {
 546         struct input_event ev;
 547         size_t bytes = 0;
 548
 549         if (count != 0 && count < input_event_size())
 550                 return -EINVAL;
 551
 552         while (bytes + input_event_size() <= count) {
 553                 /*
 554                  * Note that even if some events were fetched successfully
 555                  * we are still going to return EFAULT instead of partial
 556                  * count to let userspace know that it got it's buffers
 557                  * all wrong.
 558                  */
 559                 if (input_event_from_user(buffer + bytes, &ev))
 560                         return -EFAULT;
 561
 562                 input_event(udev->dev, ev.type, ev.code, ev.value);
 563                 bytes += input_event_size();
 564         }
 565
 566         return bytes;
 567 }
 568
 569 static ssize_t uinput_write(struct file *file, const char __user *buffer,
 570                             size_t count, loff_t *ppos)
 571 {
 572         struct uinput_device *udev = file->private_data;
 573         int retval;
 574
 575         if (count == 0)
 576                 return 0;
 577
 578         retval = mutex_lock_interruptible(&udev->mutex);
 579         if (retval)
 580                 return retval;
 581
 582         retval = udev->state == UIST_CREATED ?
 583                         uinput_inject_events(udev, buffer, count) :
 584                         uinput_setup_device_legacy(udev, buffer, count);
 585
 586         mutex_unlock(&udev->mutex);
 587
 588         return retval;
 589 }
 590
 591 static bool uinput_fetch_next_event(struct uinput_device *udev,
 592                                     struct input_event *event)
 593 {
 594         bool have_event;
 595
 596         spin_lock_irq(&udev->dev->event_lock);
 597
 598         have_event = udev->head != udev->tail;
 599         if (have_event) {
 600                 *event = udev->buff[udev->tail];
 601                 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
 602         }
 603
 604         spin_unlock_irq(&udev->dev->event_lock);
 605
 606         return have_event;
 607 }
 608
 609 static ssize_t uinput_events_to_user(struct uinput_device *udev,
 610                                      char __user *buffer, size_t count)
 611 {
 612         struct input_event event;
 613         size_t read = 0;
 614
 615         while (read + input_event_size() <= count &&
 616                uinput_fetch_next_event(udev, &event)) {
 617
 618                 if (input_event_to_user(buffer + read, &event))
 619                         return -EFAULT;
 620
 621                 read += input_event_size();
 622         }
 623
 624         return read;
 625 }
 626
 627 static ssize_t uinput_read(struct file *file, char __user *buffer,
 628                            size_t count, loff_t *ppos)
 629 {
 630         struct uinput_device *udev = file->private_data;
 631         ssize_t retval;
 632
 633         if (count != 0 && count < input_event_size())
 634                 return -EINVAL;
 635
 636         do {
 637                 retval = mutex_lock_interruptible(&udev->mutex);
 638                 if (retval)
 639                         return retval;
 640
 641                 if (udev->state != UIST_CREATED)
 642                         retval = -ENODEV;
 643                 else if (udev->head == udev->tail &&
 644                          (file->f_flags & O_NONBLOCK))
 645                         retval = -EAGAIN;
 646                 else
 647                         retval = uinput_events_to_user(udev, buffer, count);
 648
 649                 mutex_unlock(&udev->mutex);
 650
 651                 if (retval || count == 0)
 652                         break;
 653
 654                 if (!(file->f_flags & O_NONBLOCK))
 655                         retval = wait_event_interruptible(udev->waitq,
 656                                                   udev->head != udev->tail ||
 657                                                   udev->state != UIST_CREATED);
 658         } while (retval == 0);
 659
 660         return retval;
 661 }
 662
 663 static unsigned int uinput_poll(struct file *file, poll_table *wait)
 664 {
 665         struct uinput_device *udev = file->private_data;
 666
 667         poll_wait(file, &udev->waitq, wait);
 668
 669         if (udev->head != udev->tail)
 670                 return POLLIN | POLLRDNORM;
 671
 672         return 0;
 673 }
 674
 675 static int uinput_release(struct inode *inode, struct file *file)
 676 {
 677         struct uinput_device *udev = file->private_data;
 678
 679         uinput_destroy_device(udev);
 680         kfree(udev);
 681
 682         return 0;
 683 }
 684
 685 #ifdef CONFIG_COMPAT
 686 struct uinput_ff_upload_compat {
 687         __u32                   request_id;
 688         __s32                   retval;
 689         struct ff_effect_compat effect;
 690         struct ff_effect_compat old;
 691 };
 692
 693 static int uinput_ff_upload_to_user(char __user *buffer,
 694                                     const struct uinput_ff_upload *ff_up)
 695 {
 696         if (in_compat_syscall()) {
 697                 struct uinput_ff_upload_compat ff_up_compat;
 698
 699                 ff_up_compat.request_id = ff_up->request_id;
 700                 ff_up_compat.retval = ff_up->retval;
 701                 /*
 702                  * It so happens that the pointer that gives us the trouble
 703                  * is the last field in the structure. Since we don't support
 704                  * custom waveforms in uinput anyway we can just copy the whole
 705                  * thing (to the compat size) and ignore the pointer.
 706                  */
 707                 memcpy(&ff_up_compat.effect, &ff_up->effect,
 708                         sizeof(struct ff_effect_compat));
 709                 memcpy(&ff_up_compat.old, &ff_up->old,
 710                         sizeof(struct ff_effect_compat));
 711
 712                 if (copy_to_user(buffer, &ff_up_compat,
 713                                  sizeof(struct uinput_ff_upload_compat)))
 714                         return -EFAULT;
 715         } else {
 716                 if (copy_to_user(buffer, ff_up,
 717                                  sizeof(struct uinput_ff_upload)))
 718                         return -EFAULT;
 719         }
 720
 721         return 0;
 722 }
 723
 724 static int uinput_ff_upload_from_user(const char __user *buffer,
 725                                       struct uinput_ff_upload *ff_up)
 726 {
 727         if (in_compat_syscall()) {
 728                 struct uinput_ff_upload_compat ff_up_compat;
 729
 730                 if (copy_from_user(&ff_up_compat, buffer,
 731                                    sizeof(struct uinput_ff_upload_compat)))
 732                         return -EFAULT;
 733
 734                 ff_up->request_id = ff_up_compat.request_id;
 735                 ff_up->retval = ff_up_compat.retval;
 736                 memcpy(&ff_up->effect, &ff_up_compat.effect,
 737                         sizeof(struct ff_effect_compat));
 738                 memcpy(&ff_up->old, &ff_up_compat.old,
 739                         sizeof(struct ff_effect_compat));
 740
 741         } else {
 742                 if (copy_from_user(ff_up, buffer,
 743                                    sizeof(struct uinput_ff_upload)))
 744                         return -EFAULT;
 745         }
 746
 747         return 0;
 748 }
 749
 750 #else
 751
 752 static int uinput_ff_upload_to_user(char __user *buffer,
 753                                     const struct uinput_ff_upload *ff_up)
 754 {
 755         if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
 756                 return -EFAULT;
 757
 758         return 0;
 759 }
 760
 761 static int uinput_ff_upload_from_user(const char __user *buffer,
 762                                       struct uinput_ff_upload *ff_up)
 763 {
 764         if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
 765                 return -EFAULT;
 766
 767         return 0;
 768 }
 769
 770 #endif
 771
 772 #define uinput_set_bit(_arg, _bit, _max)                \
 773 ({                                                      \
 774         int __ret = 0;                                  \
 775         if (udev->state == UIST_CREATED)                \
 776                 __ret =  -EINVAL;                       \
 777         else if ((_arg) > (_max))                       \
 778                 __ret = -EINVAL;                        \
 779         else set_bit((_arg), udev->dev->_bit);          \
 780         __ret;                                          \
 781 })
 782
 783 static int uinput_str_to_user(void __user *dest, const char *str,
 784                               unsigned int maxlen)
 785 {
 786         char __user *p = dest;
 787         int len, ret;
 788
 789         if (!str)
 790                 return -ENOENT;
 791
 792         if (maxlen == 0)
 793                 return -EINVAL;
 794
 795         len = strlen(str) + 1;
 796         if (len > maxlen)
 797                 len = maxlen;
 798
 799         ret = copy_to_user(p, str, len);
 800         if (ret)
 801                 return -EFAULT;
 802
 803         /* force terminating '\0' */
 804         ret = put_user(0, p + len - 1);
 805         return ret ? -EFAULT : len;
 806 }
 807
 808 static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
 809                                  unsigned long arg, void __user *p)
 810 {
 811         int                     retval;
 812         struct uinput_device    *udev = file->private_data;
 813         struct uinput_ff_upload ff_up;
 814         struct uinput_ff_erase  ff_erase;
 815         struct uinput_request   *req;
 816         char                    *phys;
 817         const char              *name;
 818         unsigned int            size;
 819
 820         retval = mutex_lock_interruptible(&udev->mutex);
 821         if (retval)
 822                 return retval;
 823
 824         if (!udev->dev) {
 825                 retval = uinput_allocate_device(udev);
 826                 if (retval)
 827                         goto out;
 828         }
 829
 830         switch (cmd) {
 831                 case UI_GET_VERSION:
 832                         if (put_user(UINPUT_VERSION,
 833                                      (unsigned int __user *)p))
 834                                 retval = -EFAULT;
 835                         goto out;
 836
 837                 case UI_DEV_CREATE:
 838                         retval = uinput_create_device(udev);
 839                         goto out;
 840
 841                 case UI_DEV_DESTROY:
 842                         uinput_destroy_device(udev);
 843                         goto out;
 844
 845                 case UI_DEV_SETUP:
 846                         retval = uinput_dev_setup(udev, p);
 847                         goto out;
 848
 849                 /* UI_ABS_SETUP is handled in the variable size ioctls */
 850
 851                 case UI_SET_EVBIT:
 852                         retval = uinput_set_bit(arg, evbit, EV_MAX);
 853                         goto out;
 854
 855                 case UI_SET_KEYBIT:
 856                         retval = uinput_set_bit(arg, keybit, KEY_MAX);
 857                         goto out;
 858
 859                 case UI_SET_RELBIT:
 860                         retval = uinput_set_bit(arg, relbit, REL_MAX);
 861                         goto out;
 862
 863                 case UI_SET_ABSBIT:
 864                         retval = uinput_set_bit(arg, absbit, ABS_MAX);
 865                         goto out;
 866
 867                 case UI_SET_MSCBIT:
 868                         retval = uinput_set_bit(arg, mscbit, MSC_MAX);
 869                         goto out;
 870
 871                 case UI_SET_LEDBIT:
 872                         retval = uinput_set_bit(arg, ledbit, LED_MAX);
 873                         goto out;
 874
 875                 case UI_SET_SNDBIT:
 876                         retval = uinput_set_bit(arg, sndbit, SND_MAX);
 877                         goto out;
 878
 879                 case UI_SET_FFBIT:
 880                         retval = uinput_set_bit(arg, ffbit, FF_MAX);
 881                         goto out;
 882
 883                 case UI_SET_SWBIT:
 884                         retval = uinput_set_bit(arg, swbit, SW_MAX);
 885                         goto out;
 886
 887                 case UI_SET_PROPBIT:
 888                         retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
 889                         goto out;
 890
 891                 case UI_SET_PHYS:
 892                         if (udev->state == UIST_CREATED) {
 893                                 retval = -EINVAL;
 894                                 goto out;
 895                         }
 896
 897                         phys = strndup_user(p, 1024);
 898                         if (IS_ERR(phys)) {
 899                                 retval = PTR_ERR(phys);
 900                                 goto out;
 901                         }
 902
 903                         kfree(udev->dev->phys);
 904                         udev->dev->phys = phys;
 905                         goto out;
 906
 907                 case UI_BEGIN_FF_UPLOAD:
 908                         retval = uinput_ff_upload_from_user(p, &ff_up);
 909                         if (retval)
 910                                 goto out;
 911
 912                         req = uinput_request_find(udev, ff_up.request_id);
 913                         if (!req || req->code != UI_FF_UPLOAD ||
 914                             !req->u.upload.effect) {
 915                                 retval = -EINVAL;
 916                                 goto out;
 917                         }
 918
 919                         ff_up.retval = 0;
 920                         ff_up.effect = *req->u.upload.effect;
 921                         if (req->u.upload.old)
 922                                 ff_up.old = *req->u.upload.old;
 923                         else
 924                                 memset(&ff_up.old, 0, sizeof(struct ff_effect));
 925
 926                         retval = uinput_ff_upload_to_user(p, &ff_up);
 927                         goto out;
 928
 929                 case UI_BEGIN_FF_ERASE:
 930                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 931                                 retval = -EFAULT;
 932                                 goto out;
 933                         }
 934
 935                         req = uinput_request_find(udev, ff_erase.request_id);
 936                         if (!req || req->code != UI_FF_ERASE) {
 937                                 retval = -EINVAL;
 938                                 goto out;
 939                         }
 940
 941                         ff_erase.retval = 0;
 942                         ff_erase.effect_id = req->u.effect_id;
 943                         if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
 944                                 retval = -EFAULT;
 945                                 goto out;
 946                         }
 947
 948                         goto out;
 949
 950                 case UI_END_FF_UPLOAD:
 951                         retval = uinput_ff_upload_from_user(p, &ff_up);
 952                         if (retval)
 953                                 goto out;
 954
 955                         req = uinput_request_find(udev, ff_up.request_id);
 956                         if (!req || req->code != UI_FF_UPLOAD ||
 957                             !req->u.upload.effect) {
 958                                 retval = -EINVAL;
 959                                 goto out;
 960                         }
 961
 962                         req->retval = ff_up.retval;
 963                         complete(&req->done);
 964                         goto out;
 965
 966                 case UI_END_FF_ERASE:
 967                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 968                                 retval = -EFAULT;
 969                                 goto out;
 970                         }
 971
 972                         req = uinput_request_find(udev, ff_erase.request_id);
 973                         if (!req || req->code != UI_FF_ERASE) {
 974                                 retval = -EINVAL;
 975                                 goto out;
 976                         }
 977
 978                         req->retval = ff_erase.retval;
 979                         complete(&req->done);
 980                         goto out;
 981         }
 982
 983         size = _IOC_SIZE(cmd);
 984
 985         /* Now check variable-length commands */
 986         switch (cmd & ~IOCSIZE_MASK) {
 987         case UI_GET_SYSNAME(0):
 988                 if (udev->state != UIST_CREATED) {
 989                         retval = -ENOENT;
 990                         goto out;
 991                 }
 992                 name = dev_name(&udev->dev->dev);
 993                 retval = uinput_str_to_user(p, name, size);
 994                 goto out;
 995
 996         case UI_ABS_SETUP & ~IOCSIZE_MASK:
 997                 retval = uinput_abs_setup(udev, p, size);
 998                 goto out;
 999         }
1000
1001         retval = -EINVAL;
1002  out:
1003         mutex_unlock(&udev->mutex);
1004         return retval;
1005 }
1006
1007 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1008 {
1009         return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
1010 }
1011
1012 #ifdef CONFIG_COMPAT
1013
1014 #define UI_SET_PHYS_COMPAT      _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t)
1015
1016 static long uinput_compat_ioctl(struct file *file,
1017                                 unsigned int cmd, unsigned long arg)
1018 {
1019         if (cmd == UI_SET_PHYS_COMPAT)
1020                 cmd = UI_SET_PHYS;
1021
1022         return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
1023 }
1024 #endif
1025
1026 static const struct file_operations uinput_fops = {
1027         .owner          = THIS_MODULE,
1028         .open           = uinput_open,
1029         .release        = uinput_release,
1030         .read           = uinput_read,
1031         .write          = uinput_write,
1032         .poll           = uinput_poll,
1033         .unlocked_ioctl = uinput_ioctl,
1034 #ifdef CONFIG_COMPAT
1035         .compat_ioctl   = uinput_compat_ioctl,
1036 #endif
1037         .llseek         = no_llseek,
1038 };
1039
1040 static struct miscdevice uinput_misc = {
1041         .fops           = &uinput_fops,
1042         .minor          = UINPUT_MINOR,
1043         .name           = UINPUT_NAME,
1044 };
1045 module_misc_device(uinput_misc);
1046
1047 MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
1048 MODULE_ALIAS("devname:" UINPUT_NAME);
1049
1050 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
1051 MODULE_DESCRIPTION("User level driver support for input subsystem");
1052 MODULE_LICENSE("GPL");
1053 MODULE_VERSION("0.3");