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/overflow.h>
  43 #include <linux/input/mt.h>
  44 #include "../input-compat.h"
  45
  46 static int uinput_dev_event(struct input_dev *dev,
  47                             unsigned int type, unsigned int code, int value)
  48 {
  49         struct uinput_device    *udev = input_get_drvdata(dev);
  50
  51         udev->buff[udev->head].type = type;
  52         udev->buff[udev->head].code = code;
  53         udev->buff[udev->head].value = value;
  54         do_gettimeofday(&udev->buff[udev->head].time);
  55         udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
  56
  57         wake_up_interruptible(&udev->waitq);
  58
  59         return 0;
  60 }
  61
  62 /* Atomically allocate an ID for the given request. Returns 0 on success. */
  63 static bool uinput_request_alloc_id(struct uinput_device *udev,
  64                                     struct uinput_request *request)
  65 {
  66         unsigned int id;
  67         bool reserved = false;
  68
  69         spin_lock(&udev->requests_lock);
  70
  71         for (id = 0; id < UINPUT_NUM_REQUESTS; id++) {
  72                 if (!udev->requests[id]) {
  73                         request->id = id;
  74                         udev->requests[id] = request;
  75                         reserved = true;
  76                         break;
  77                 }
  78         }
  79
  80         spin_unlock(&udev->requests_lock);
  81         return reserved;
  82 }
  83
  84 static struct uinput_request *uinput_request_find(struct uinput_device *udev,
  85                                                   unsigned int id)
  86 {
  87         /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
  88         if (id >= UINPUT_NUM_REQUESTS)
  89                 return NULL;
  90
  91         return udev->requests[id];
  92 }
  93
  94 static int uinput_request_reserve_slot(struct uinput_device *udev,
  95                                        struct uinput_request *request)
  96 {
  97         /* Allocate slot. If none are available right away, wait. */
  98         return wait_event_interruptible(udev->requests_waitq,
  99                                         uinput_request_alloc_id(udev, request));
 100 }
 101
 102 static void uinput_request_release_slot(struct uinput_device *udev,
 103                                         unsigned int id)
 104 {
 105         /* Mark slot as available */
 106         spin_lock(&udev->requests_lock);
 107         udev->requests[id] = NULL;
 108         spin_unlock(&udev->requests_lock);
 109
 110         wake_up(&udev->requests_waitq);
 111 }
 112
 113 static int uinput_request_send(struct uinput_device *udev,
 114                                struct uinput_request *request)
 115 {
 116         int retval;
 117
 118         retval = mutex_lock_interruptible(&udev->mutex);
 119         if (retval)
 120                 return retval;
 121
 122         if (udev->state != UIST_CREATED) {
 123                 retval = -ENODEV;
 124                 goto out;
 125         }
 126
 127         init_completion(&request->done);
 128
 129         /*
 130          * Tell our userspace application about this new request
 131          * by queueing an input event.
 132          */
 133         uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
 134
 135  out:
 136         mutex_unlock(&udev->mutex);
 137         return retval;
 138 }
 139
 140 static int uinput_request_submit(struct uinput_device *udev,
 141                                  struct uinput_request *request)
 142 {
 143         int retval;
 144
 145         retval = uinput_request_reserve_slot(udev, request);
 146         if (retval)
 147                 return retval;
 148
 149         retval = uinput_request_send(udev, request);
 150         if (retval)
 151                 goto out;
 152
 153         wait_for_completion(&request->done);
 154         retval = request->retval;
 155
 156  out:
 157         uinput_request_release_slot(udev, request->id);
 158         return retval;
 159 }
 160
 161 /*
 162  * Fail all outstanding requests so handlers don't wait for the userspace
 163  * to finish processing them.
 164  */
 165 static void uinput_flush_requests(struct uinput_device *udev)
 166 {
 167         struct uinput_request *request;
 168         int i;
 169
 170         spin_lock(&udev->requests_lock);
 171
 172         for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
 173                 request = udev->requests[i];
 174                 if (request) {
 175                         request->retval = -ENODEV;
 176                         complete(&request->done);
 177                 }
 178         }
 179
 180         spin_unlock(&udev->requests_lock);
 181 }
 182
 183 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
 184 {
 185         uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
 186 }
 187
 188 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
 189 {
 190         uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
 191 }
 192
 193 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
 194 {
 195         return uinput_dev_event(dev, EV_FF, effect_id, value);
 196 }
 197
 198 static int uinput_dev_upload_effect(struct input_dev *dev,
 199                                     struct ff_effect *effect,
 200                                     struct ff_effect *old)
 201 {
 202         struct uinput_device *udev = input_get_drvdata(dev);
 203         struct uinput_request request;
 204
 205         /*
 206          * uinput driver does not currently support periodic effects with
 207          * custom waveform since it does not have a way to pass buffer of
 208          * samples (custom_data) to userspace. If ever there is a device
 209          * supporting custom waveforms we would need to define an additional
 210          * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
 211          */
 212         if (effect->type == FF_PERIODIC &&
 213                         effect->u.periodic.waveform == FF_CUSTOM)
 214                 return -EINVAL;
 215
 216         request.code = UI_FF_UPLOAD;
 217         request.u.upload.effect = effect;
 218         request.u.upload.old = old;
 219
 220         return uinput_request_submit(udev, &request);
 221 }
 222
 223 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
 224 {
 225         struct uinput_device *udev = input_get_drvdata(dev);
 226         struct uinput_request request;
 227
 228         if (!test_bit(EV_FF, dev->evbit))
 229                 return -ENOSYS;
 230
 231         request.code = UI_FF_ERASE;
 232         request.u.effect_id = effect_id;
 233
 234         return uinput_request_submit(udev, &request);
 235 }
 236
 237 static int uinput_dev_flush(struct input_dev *dev, struct file *file)
 238 {
 239         /*
 240          * If we are called with file == NULL that means we are tearing
 241          * down the device, and therefore we can not handle FF erase
 242          * requests: either we are handling UI_DEV_DESTROY (and holding
 243          * the udev->mutex), or the file descriptor is closed and there is
 244          * nobody on the other side anymore.
 245          */
 246         return file ? input_ff_flush(dev, file) : 0;
 247 }
 248
 249 static void uinput_destroy_device(struct uinput_device *udev)
 250 {
 251         const char *name, *phys;
 252         struct input_dev *dev = udev->dev;
 253         enum uinput_state old_state = udev->state;
 254
 255         udev->state = UIST_NEW_DEVICE;
 256
 257         if (dev) {
 258                 name = dev->name;
 259                 phys = dev->phys;
 260                 if (old_state == UIST_CREATED) {
 261                         uinput_flush_requests(udev);
 262                         input_unregister_device(dev);
 263                 } else {
 264                         input_free_device(dev);
 265                 }
 266                 kfree(name);
 267                 kfree(phys);
 268                 udev->dev = NULL;
 269         }
 270 }
 271
 272 static int uinput_create_device(struct uinput_device *udev)
 273 {
 274         struct input_dev *dev = udev->dev;
 275         int error, nslot;
 276
 277         if (udev->state != UIST_SETUP_COMPLETE) {
 278                 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
 279                 return -EINVAL;
 280         }
 281
 282         if (test_bit(EV_ABS, dev->evbit)) {
 283                 input_alloc_absinfo(dev);
 284                 if (!dev->absinfo) {
 285                         error = -EINVAL;
 286                         goto fail1;
 287                 }
 288
 289                 if (test_bit(ABS_MT_SLOT, dev->absbit)) {
 290                         nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
 291                         error = input_mt_init_slots(dev, nslot, 0);
 292                         if (error)
 293                                 goto fail1;
 294                 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
 295                         input_set_events_per_packet(dev, 60);
 296                 }
 297         }
 298
 299         if (test_bit(EV_FF, dev->evbit) && !udev->ff_effects_max) {
 300                 printk(KERN_DEBUG "%s: ff_effects_max should be non-zero when FF_BIT is set\n",
 301                         UINPUT_NAME);
 302                 error = -EINVAL;
 303                 goto fail1;
 304         }
 305
 306         if (udev->ff_effects_max) {
 307                 error = input_ff_create(dev, udev->ff_effects_max);
 308                 if (error)
 309                         goto fail1;
 310
 311                 dev->ff->upload = uinput_dev_upload_effect;
 312                 dev->ff->erase = uinput_dev_erase_effect;
 313                 dev->ff->playback = uinput_dev_playback;
 314                 dev->ff->set_gain = uinput_dev_set_gain;
 315                 dev->ff->set_autocenter = uinput_dev_set_autocenter;
 316                 /*
 317                  * The standard input_ff_flush() implementation does
 318                  * not quite work for uinput as we can't reasonably
 319                  * handle FF requests during device teardown.
 320                  */
 321                 dev->flush = uinput_dev_flush;
 322         }
 323
 324         error = input_register_device(udev->dev);
 325         if (error)
 326                 goto fail2;
 327
 328         udev->state = UIST_CREATED;
 329
 330         return 0;
 331
 332  fail2: input_ff_destroy(dev);
 333  fail1: uinput_destroy_device(udev);
 334         return error;
 335 }
 336
 337 static int uinput_open(struct inode *inode, struct file *file)
 338 {
 339         struct uinput_device *newdev;
 340
 341         newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
 342         if (!newdev)
 343                 return -ENOMEM;
 344
 345         mutex_init(&newdev->mutex);
 346         spin_lock_init(&newdev->requests_lock);
 347         init_waitqueue_head(&newdev->requests_waitq);
 348         init_waitqueue_head(&newdev->waitq);
 349         newdev->state = UIST_NEW_DEVICE;
 350
 351         file->private_data = newdev;
 352         nonseekable_open(inode, file);
 353
 354         return 0;
 355 }
 356
 357 static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code,
 358                                    const struct input_absinfo *abs)
 359 {
 360         int min, max, range;
 361
 362         min = abs->minimum;
 363         max = abs->maximum;
 364
 365         if ((min != 0 || max != 0) && max <= min) {
 366                 printk(KERN_DEBUG
 367                        "%s: invalid abs[%02x] min:%d max:%d\n",
 368                        UINPUT_NAME, code, min, max);
 369                 return -EINVAL;
 370         }
 371
 372         if (!check_sub_overflow(max, min, &range) && abs->flat > range) {
 373                 printk(KERN_DEBUG
 374                        "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n",
 375                        UINPUT_NAME, code, abs->flat, min, max);
 376                 return -EINVAL;
 377         }
 378
 379         return 0;
 380 }
 381
 382 static int uinput_validate_absbits(struct input_dev *dev)
 383 {
 384         unsigned int cnt;
 385         int error;
 386
 387         if (!test_bit(EV_ABS, dev->evbit))
 388                 return 0;
 389
 390         /*
 391          * Check if absmin/absmax/absfuzz/absflat are sane.
 392          */
 393
 394         for_each_set_bit(cnt, dev->absbit, ABS_CNT) {
 395                 if (!dev->absinfo)
 396                         return -EINVAL;
 397
 398                 error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]);
 399                 if (error)
 400                         return error;
 401         }
 402
 403         return 0;
 404 }
 405
 406 static int uinput_allocate_device(struct uinput_device *udev)
 407 {
 408         udev->dev = input_allocate_device();
 409         if (!udev->dev)
 410                 return -ENOMEM;
 411
 412         udev->dev->event = uinput_dev_event;
 413         input_set_drvdata(udev->dev, udev);
 414
 415         return 0;
 416 }
 417
 418 static int uinput_dev_setup(struct uinput_device *udev,
 419                             struct uinput_setup __user *arg)
 420 {
 421         struct uinput_setup setup;
 422         struct input_dev *dev;
 423
 424         if (udev->state == UIST_CREATED)
 425                 return -EINVAL;
 426
 427         if (copy_from_user(&setup, arg, sizeof(setup)))
 428                 return -EFAULT;
 429
 430         if (!setup.name[0])
 431                 return -EINVAL;
 432
 433         dev = udev->dev;
 434         dev->id = setup.id;
 435         udev->ff_effects_max = setup.ff_effects_max;
 436
 437         kfree(dev->name);
 438         dev->name = kstrndup(setup.name, UINPUT_MAX_NAME_SIZE, GFP_KERNEL);
 439         if (!dev->name)
 440                 return -ENOMEM;
 441
 442         udev->state = UIST_SETUP_COMPLETE;
 443         return 0;
 444 }
 445
 446 static int uinput_abs_setup(struct uinput_device *udev,
 447                             struct uinput_setup __user *arg, size_t size)
 448 {
 449         struct uinput_abs_setup setup = {};
 450         struct input_dev *dev;
 451         int error;
 452
 453         if (size > sizeof(setup))
 454                 return -E2BIG;
 455
 456         if (udev->state == UIST_CREATED)
 457                 return -EINVAL;
 458
 459         if (copy_from_user(&setup, arg, size))
 460                 return -EFAULT;
 461
 462         if (setup.code > ABS_MAX)
 463                 return -ERANGE;
 464
 465         dev = udev->dev;
 466
 467         error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo);
 468         if (error)
 469                 return error;
 470
 471         input_alloc_absinfo(dev);
 472         if (!dev->absinfo)
 473                 return -ENOMEM;
 474
 475         set_bit(setup.code, dev->absbit);
 476         dev->absinfo[setup.code] = setup.absinfo;
 477         return 0;
 478 }
 479
 480 /* legacy setup via write() */
 481 static int uinput_setup_device_legacy(struct uinput_device *udev,
 482                                       const char __user *buffer, size_t count)
 483 {
 484         struct uinput_user_dev  *user_dev;
 485         struct input_dev        *dev;
 486         int                     i;
 487         int                     retval;
 488
 489         if (count != sizeof(struct uinput_user_dev))
 490                 return -EINVAL;
 491
 492         if (!udev->dev) {
 493                 retval = uinput_allocate_device(udev);
 494                 if (retval)
 495                         return retval;
 496         }
 497
 498         dev = udev->dev;
 499
 500         user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
 501         if (IS_ERR(user_dev))
 502                 return PTR_ERR(user_dev);
 503
 504         udev->ff_effects_max = user_dev->ff_effects_max;
 505
 506         /* Ensure name is filled in */
 507         if (!user_dev->name[0]) {
 508                 retval = -EINVAL;
 509                 goto exit;
 510         }
 511
 512         kfree(dev->name);
 513         dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
 514                              GFP_KERNEL);
 515         if (!dev->name) {
 516                 retval = -ENOMEM;
 517                 goto exit;
 518         }
 519
 520         dev->id.bustype = user_dev->id.bustype;
 521         dev->id.vendor  = user_dev->id.vendor;
 522         dev->id.product = user_dev->id.product;
 523         dev->id.version = user_dev->id.version;
 524
 525         for (i = 0; i < ABS_CNT; i++) {
 526                 input_abs_set_max(dev, i, user_dev->absmax[i]);
 527                 input_abs_set_min(dev, i, user_dev->absmin[i]);
 528                 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
 529                 input_abs_set_flat(dev, i, user_dev->absflat[i]);
 530         }
 531
 532         retval = uinput_validate_absbits(dev);
 533         if (retval < 0)
 534                 goto exit;
 535
 536         udev->state = UIST_SETUP_COMPLETE;
 537         retval = count;
 538
 539  exit:
 540         kfree(user_dev);
 541         return retval;
 542 }
 543
 544 static ssize_t uinput_inject_events(struct uinput_device *udev,
 545                                     const char __user *buffer, size_t count)
 546 {
 547         struct input_event ev;
 548         size_t bytes = 0;
 549
 550         if (count != 0 && count < input_event_size())
 551                 return -EINVAL;
 552
 553         while (bytes + input_event_size() <= count) {
 554                 /*
 555                  * Note that even if some events were fetched successfully
 556                  * we are still going to return EFAULT instead of partial
 557                  * count to let userspace know that it got it's buffers
 558                  * all wrong.
 559                  */
 560                 if (input_event_from_user(buffer + bytes, &ev))
 561                         return -EFAULT;
 562
 563                 input_event(udev->dev, ev.type, ev.code, ev.value);
 564                 bytes += input_event_size();
 565         }
 566
 567         return bytes;
 568 }
 569
 570 static ssize_t uinput_write(struct file *file, const char __user *buffer,
 571                             size_t count, loff_t *ppos)
 572 {
 573         struct uinput_device *udev = file->private_data;
 574         int retval;
 575
 576         if (count == 0)
 577                 return 0;
 578
 579         retval = mutex_lock_interruptible(&udev->mutex);
 580         if (retval)
 581                 return retval;
 582
 583         retval = udev->state == UIST_CREATED ?
 584                         uinput_inject_events(udev, buffer, count) :
 585                         uinput_setup_device_legacy(udev, buffer, count);
 586
 587         mutex_unlock(&udev->mutex);
 588
 589         return retval;
 590 }
 591
 592 static bool uinput_fetch_next_event(struct uinput_device *udev,
 593                                     struct input_event *event)
 594 {
 595         bool have_event;
 596
 597         spin_lock_irq(&udev->dev->event_lock);
 598
 599         have_event = udev->head != udev->tail;
 600         if (have_event) {
 601                 *event = udev->buff[udev->tail];
 602                 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
 603         }
 604
 605         spin_unlock_irq(&udev->dev->event_lock);
 606
 607         return have_event;
 608 }
 609
 610 static ssize_t uinput_events_to_user(struct uinput_device *udev,
 611                                      char __user *buffer, size_t count)
 612 {
 613         struct input_event event;
 614         size_t read = 0;
 615
 616         while (read + input_event_size() <= count &&
 617                uinput_fetch_next_event(udev, &event)) {
 618
 619                 if (input_event_to_user(buffer + read, &event))
 620                         return -EFAULT;
 621
 622                 read += input_event_size();
 623         }
 624
 625         return read;
 626 }
 627
 628 static ssize_t uinput_read(struct file *file, char __user *buffer,
 629                            size_t count, loff_t *ppos)
 630 {
 631         struct uinput_device *udev = file->private_data;
 632         ssize_t retval;
 633
 634         if (count != 0 && count < input_event_size())
 635                 return -EINVAL;
 636
 637         do {
 638                 retval = mutex_lock_interruptible(&udev->mutex);
 639                 if (retval)
 640                         return retval;
 641
 642                 if (udev->state != UIST_CREATED)
 643                         retval = -ENODEV;
 644                 else if (udev->head == udev->tail &&
 645                          (file->f_flags & O_NONBLOCK))
 646                         retval = -EAGAIN;
 647                 else
 648                         retval = uinput_events_to_user(udev, buffer, count);
 649
 650                 mutex_unlock(&udev->mutex);
 651
 652                 if (retval || count == 0)
 653                         break;
 654
 655                 if (!(file->f_flags & O_NONBLOCK))
 656                         retval = wait_event_interruptible(udev->waitq,
 657                                                   udev->head != udev->tail ||
 658                                                   udev->state != UIST_CREATED);
 659         } while (retval == 0);
 660
 661         return retval;
 662 }
 663
 664 static unsigned int uinput_poll(struct file *file, poll_table *wait)
 665 {
 666         struct uinput_device *udev = file->private_data;
 667
 668         poll_wait(file, &udev->waitq, wait);
 669
 670         if (udev->head != udev->tail)
 671                 return POLLIN | POLLRDNORM;
 672
 673         return 0;
 674 }
 675
 676 static int uinput_release(struct inode *inode, struct file *file)
 677 {
 678         struct uinput_device *udev = file->private_data;
 679
 680         uinput_destroy_device(udev);
 681         kfree(udev);
 682
 683         return 0;
 684 }
 685
 686 #ifdef CONFIG_COMPAT
 687 struct uinput_ff_upload_compat {
 688         __u32                   request_id;
 689         __s32                   retval;
 690         struct ff_effect_compat effect;
 691         struct ff_effect_compat old;
 692 };
 693
 694 static int uinput_ff_upload_to_user(char __user *buffer,
 695                                     const struct uinput_ff_upload *ff_up)
 696 {
 697         if (in_compat_syscall()) {
 698                 struct uinput_ff_upload_compat ff_up_compat;
 699
 700                 ff_up_compat.request_id = ff_up->request_id;
 701                 ff_up_compat.retval = ff_up->retval;
 702                 /*
 703                  * It so happens that the pointer that gives us the trouble
 704                  * is the last field in the structure. Since we don't support
 705                  * custom waveforms in uinput anyway we can just copy the whole
 706                  * thing (to the compat size) and ignore the pointer.
 707                  */
 708                 memcpy(&ff_up_compat.effect, &ff_up->effect,
 709                         sizeof(struct ff_effect_compat));
 710                 memcpy(&ff_up_compat.old, &ff_up->old,
 711                         sizeof(struct ff_effect_compat));
 712
 713                 if (copy_to_user(buffer, &ff_up_compat,
 714                                  sizeof(struct uinput_ff_upload_compat)))
 715                         return -EFAULT;
 716         } else {
 717                 if (copy_to_user(buffer, ff_up,
 718                                  sizeof(struct uinput_ff_upload)))
 719                         return -EFAULT;
 720         }
 721
 722         return 0;
 723 }
 724
 725 static int uinput_ff_upload_from_user(const char __user *buffer,
 726                                       struct uinput_ff_upload *ff_up)
 727 {
 728         if (in_compat_syscall()) {
 729                 struct uinput_ff_upload_compat ff_up_compat;
 730
 731                 if (copy_from_user(&ff_up_compat, buffer,
 732                                    sizeof(struct uinput_ff_upload_compat)))
 733                         return -EFAULT;
 734
 735                 ff_up->request_id = ff_up_compat.request_id;
 736                 ff_up->retval = ff_up_compat.retval;
 737                 memcpy(&ff_up->effect, &ff_up_compat.effect,
 738                         sizeof(struct ff_effect_compat));
 739                 memcpy(&ff_up->old, &ff_up_compat.old,
 740                         sizeof(struct ff_effect_compat));
 741
 742         } else {
 743                 if (copy_from_user(ff_up, buffer,
 744                                    sizeof(struct uinput_ff_upload)))
 745                         return -EFAULT;
 746         }
 747
 748         return 0;
 749 }
 750
 751 #else
 752
 753 static int uinput_ff_upload_to_user(char __user *buffer,
 754                                     const struct uinput_ff_upload *ff_up)
 755 {
 756         if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
 757                 return -EFAULT;
 758
 759         return 0;
 760 }
 761
 762 static int uinput_ff_upload_from_user(const char __user *buffer,
 763                                       struct uinput_ff_upload *ff_up)
 764 {
 765         if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
 766                 return -EFAULT;
 767
 768         return 0;
 769 }
 770
 771 #endif
 772
 773 #define uinput_set_bit(_arg, _bit, _max)                \
 774 ({                                                      \
 775         int __ret = 0;                                  \
 776         if (udev->state == UIST_CREATED)                \
 777                 __ret =  -EINVAL;                       \
 778         else if ((_arg) > (_max))                       \
 779                 __ret = -EINVAL;                        \
 780         else set_bit((_arg), udev->dev->_bit);          \
 781         __ret;                                          \
 782 })
 783
 784 static int uinput_str_to_user(void __user *dest, const char *str,
 785                               unsigned int maxlen)
 786 {
 787         char __user *p = dest;
 788         int len, ret;
 789
 790         if (!str)
 791                 return -ENOENT;
 792
 793         if (maxlen == 0)
 794                 return -EINVAL;
 795
 796         len = strlen(str) + 1;
 797         if (len > maxlen)
 798                 len = maxlen;
 799
 800         ret = copy_to_user(p, str, len);
 801         if (ret)
 802                 return -EFAULT;
 803
 804         /* force terminating '\0' */
 805         ret = put_user(0, p + len - 1);
 806         return ret ? -EFAULT : len;
 807 }
 808
 809 static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
 810                                  unsigned long arg, void __user *p)
 811 {
 812         int                     retval;
 813         struct uinput_device    *udev = file->private_data;
 814         struct uinput_ff_upload ff_up;
 815         struct uinput_ff_erase  ff_erase;
 816         struct uinput_request   *req;
 817         char                    *phys;
 818         const char              *name;
 819         unsigned int            size;
 820
 821         retval = mutex_lock_interruptible(&udev->mutex);
 822         if (retval)
 823                 return retval;
 824
 825         if (!udev->dev) {
 826                 retval = uinput_allocate_device(udev);
 827                 if (retval)
 828                         goto out;
 829         }
 830
 831         switch (cmd) {
 832                 case UI_GET_VERSION:
 833                         if (put_user(UINPUT_VERSION,
 834                                      (unsigned int __user *)p))
 835                                 retval = -EFAULT;
 836                         goto out;
 837
 838                 case UI_DEV_CREATE:
 839                         retval = uinput_create_device(udev);
 840                         goto out;
 841
 842                 case UI_DEV_DESTROY:
 843                         uinput_destroy_device(udev);
 844                         goto out;
 845
 846                 case UI_DEV_SETUP:
 847                         retval = uinput_dev_setup(udev, p);
 848                         goto out;
 849
 850                 /* UI_ABS_SETUP is handled in the variable size ioctls */
 851
 852                 case UI_SET_EVBIT:
 853                         retval = uinput_set_bit(arg, evbit, EV_MAX);
 854                         goto out;
 855
 856                 case UI_SET_KEYBIT:
 857                         retval = uinput_set_bit(arg, keybit, KEY_MAX);
 858                         goto out;
 859
 860                 case UI_SET_RELBIT:
 861                         retval = uinput_set_bit(arg, relbit, REL_MAX);
 862                         goto out;
 863
 864                 case UI_SET_ABSBIT:
 865                         retval = uinput_set_bit(arg, absbit, ABS_MAX);
 866                         goto out;
 867
 868                 case UI_SET_MSCBIT:
 869                         retval = uinput_set_bit(arg, mscbit, MSC_MAX);
 870                         goto out;
 871
 872                 case UI_SET_LEDBIT:
 873                         retval = uinput_set_bit(arg, ledbit, LED_MAX);
 874                         goto out;
 875
 876                 case UI_SET_SNDBIT:
 877                         retval = uinput_set_bit(arg, sndbit, SND_MAX);
 878                         goto out;
 879
 880                 case UI_SET_FFBIT:
 881                         retval = uinput_set_bit(arg, ffbit, FF_MAX);
 882                         goto out;
 883
 884                 case UI_SET_SWBIT:
 885                         retval = uinput_set_bit(arg, swbit, SW_MAX);
 886                         goto out;
 887
 888                 case UI_SET_PROPBIT:
 889                         retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
 890                         goto out;
 891
 892                 case UI_SET_PHYS:
 893                         if (udev->state == UIST_CREATED) {
 894                                 retval = -EINVAL;
 895                                 goto out;
 896                         }
 897
 898                         phys = strndup_user(p, 1024);
 899                         if (IS_ERR(phys)) {
 900                                 retval = PTR_ERR(phys);
 901                                 goto out;
 902                         }
 903
 904                         kfree(udev->dev->phys);
 905                         udev->dev->phys = phys;
 906                         goto out;
 907
 908                 case UI_BEGIN_FF_UPLOAD:
 909                         retval = uinput_ff_upload_from_user(p, &ff_up);
 910                         if (retval)
 911                                 goto out;
 912
 913                         req = uinput_request_find(udev, ff_up.request_id);
 914                         if (!req || req->code != UI_FF_UPLOAD ||
 915                             !req->u.upload.effect) {
 916                                 retval = -EINVAL;
 917                                 goto out;
 918                         }
 919
 920                         ff_up.retval = 0;
 921                         ff_up.effect = *req->u.upload.effect;
 922                         if (req->u.upload.old)
 923                                 ff_up.old = *req->u.upload.old;
 924                         else
 925                                 memset(&ff_up.old, 0, sizeof(struct ff_effect));
 926
 927                         retval = uinput_ff_upload_to_user(p, &ff_up);
 928                         goto out;
 929
 930                 case UI_BEGIN_FF_ERASE:
 931                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 932                                 retval = -EFAULT;
 933                                 goto out;
 934                         }
 935
 936                         req = uinput_request_find(udev, ff_erase.request_id);
 937                         if (!req || req->code != UI_FF_ERASE) {
 938                                 retval = -EINVAL;
 939                                 goto out;
 940                         }
 941
 942                         ff_erase.retval = 0;
 943                         ff_erase.effect_id = req->u.effect_id;
 944                         if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
 945                                 retval = -EFAULT;
 946                                 goto out;
 947                         }
 948
 949                         goto out;
 950
 951                 case UI_END_FF_UPLOAD:
 952                         retval = uinput_ff_upload_from_user(p, &ff_up);
 953                         if (retval)
 954                                 goto out;
 955
 956                         req = uinput_request_find(udev, ff_up.request_id);
 957                         if (!req || req->code != UI_FF_UPLOAD ||
 958                             !req->u.upload.effect) {
 959                                 retval = -EINVAL;
 960                                 goto out;
 961                         }
 962
 963                         req->retval = ff_up.retval;
 964                         complete(&req->done);
 965                         goto out;
 966
 967                 case UI_END_FF_ERASE:
 968                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 969                                 retval = -EFAULT;
 970                                 goto out;
 971                         }
 972
 973                         req = uinput_request_find(udev, ff_erase.request_id);
 974                         if (!req || req->code != UI_FF_ERASE) {
 975                                 retval = -EINVAL;
 976                                 goto out;
 977                         }
 978
 979                         req->retval = ff_erase.retval;
 980                         complete(&req->done);
 981                         goto out;
 982         }
 983
 984         size = _IOC_SIZE(cmd);
 985
 986         /* Now check variable-length commands */
 987         switch (cmd & ~IOCSIZE_MASK) {
 988         case UI_GET_SYSNAME(0):
 989                 if (udev->state != UIST_CREATED) {
 990                         retval = -ENOENT;
 991                         goto out;
 992                 }
 993                 name = dev_name(&udev->dev->dev);
 994                 retval = uinput_str_to_user(p, name, size);
 995                 goto out;
 996
 997         case UI_ABS_SETUP & ~IOCSIZE_MASK:
 998                 retval = uinput_abs_setup(udev, p, size);
 999                 goto out;
1000         }
1001
1002         retval = -EINVAL;
1003  out:
1004         mutex_unlock(&udev->mutex);
1005         return retval;
1006 }
1007
1008 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1009 {
1010         return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
1011 }
1012
1013 #ifdef CONFIG_COMPAT
1014
1015 /*
1016  * These IOCTLs change their size and thus their numbers between
1017  * 32 and 64 bits.
1018  */
1019 #define UI_SET_PHYS_COMPAT              \
1020         _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t)
1021 #define UI_BEGIN_FF_UPLOAD_COMPAT       \
1022         _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload_compat)
1023 #define UI_END_FF_UPLOAD_COMPAT         \
1024         _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload_compat)
1025
1026 static long uinput_compat_ioctl(struct file *file,
1027                                 unsigned int cmd, unsigned long arg)
1028 {
1029         switch (cmd) {
1030         case UI_SET_PHYS_COMPAT:
1031                 cmd = UI_SET_PHYS;
1032                 break;
1033         case UI_BEGIN_FF_UPLOAD_COMPAT:
1034                 cmd = UI_BEGIN_FF_UPLOAD;
1035                 break;
1036         case UI_END_FF_UPLOAD_COMPAT:
1037                 cmd = UI_END_FF_UPLOAD;
1038                 break;
1039         }
1040
1041         return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
1042 }
1043 #endif
1044
1045 static const struct file_operations uinput_fops = {
1046         .owner          = THIS_MODULE,
1047         .open           = uinput_open,
1048         .release        = uinput_release,
1049         .read           = uinput_read,
1050         .write          = uinput_write,
1051         .poll           = uinput_poll,
1052         .unlocked_ioctl = uinput_ioctl,
1053 #ifdef CONFIG_COMPAT
1054         .compat_ioctl   = uinput_compat_ioctl,
1055 #endif
1056         .llseek         = no_llseek,
1057 };
1058
1059 static struct miscdevice uinput_misc = {
1060         .fops           = &uinput_fops,
1061         .minor          = UINPUT_MINOR,
1062         .name           = UINPUT_NAME,
1063 };
1064 module_misc_device(uinput_misc);
1065
1066 MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
1067 MODULE_ALIAS("devname:" UINPUT_NAME);
1068
1069 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
1070 MODULE_DESCRIPTION("User level driver support for input subsystem");
1071 MODULE_LICENSE("GPL");
1072 MODULE_VERSION("0.3");