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