linux/drivers/input/misc/uinput.c
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   1/*
   2 *  User level driver support for input subsystem
   3 *
   4 * Heavily based on evdev.c by Vojtech Pavlik
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19 *
  20 * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
  21 *
  22 * Changes/Revisions:
  23 *      0.3     09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>)
  24 *              - updated ff support for the changes in kernel interface
  25 *              - added MODULE_VERSION
  26 *      0.2     16/10/2004 (Micah Dowty <micah@navi.cx>)
  27 *              - added force feedback support
  28 *              - added UI_SET_PHYS
  29 *      0.1     20/06/2002
  30 *              - first public version
  31 */
  32#include <linux/poll.h>
  33#include <linux/slab.h>
  34#include <linux/module.h>
  35#include <linux/init.h>
  36#include <linux/smp_lock.h>
  37#include <linux/fs.h>
  38#include <linux/miscdevice.h>
  39#include <linux/uinput.h>
  40#include "../input-compat.h"
  41
  42static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  43{
  44        struct uinput_device    *udev = input_get_drvdata(dev);
  45
  46        udev->buff[udev->head].type = type;
  47        udev->buff[udev->head].code = code;
  48        udev->buff[udev->head].value = value;
  49        do_gettimeofday(&udev->buff[udev->head].time);
  50        udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
  51
  52        wake_up_interruptible(&udev->waitq);
  53
  54        return 0;
  55}
  56
  57static int uinput_request_alloc_id(struct uinput_device *udev, struct uinput_request *request)
  58{
  59        /* Atomically allocate an ID for the given request. Returns 0 on success. */
  60        int id;
  61        int err = -1;
  62
  63        spin_lock(&udev->requests_lock);
  64
  65        for (id = 0; id < UINPUT_NUM_REQUESTS; id++)
  66                if (!udev->requests[id]) {
  67                        request->id = id;
  68                        udev->requests[id] = request;
  69                        err = 0;
  70                        break;
  71                }
  72
  73        spin_unlock(&udev->requests_lock);
  74        return err;
  75}
  76
  77static struct uinput_request* uinput_request_find(struct uinput_device *udev, int id)
  78{
  79        /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
  80        if (id >= UINPUT_NUM_REQUESTS || id < 0)
  81                return NULL;
  82
  83        return udev->requests[id];
  84}
  85
  86static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request)
  87{
  88        /* Allocate slot. If none are available right away, wait. */
  89        return wait_event_interruptible(udev->requests_waitq,
  90                                        !uinput_request_alloc_id(udev, request));
  91}
  92
  93static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request)
  94{
  95        /* Mark slot as available */
  96        udev->requests[request->id] = NULL;
  97        wake_up(&udev->requests_waitq);
  98
  99        complete(&request->done);
 100}
 101
 102static int uinput_request_submit(struct input_dev *dev, struct uinput_request *request)
 103{
 104        /* Tell our userspace app about this new request by queueing an input event */
 105        uinput_dev_event(dev, EV_UINPUT, request->code, request->id);
 106
 107        /* Wait for the request to complete */
 108        wait_for_completion(&request->done);
 109        return request->retval;
 110}
 111
 112static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
 113{
 114        uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
 115}
 116
 117static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
 118{
 119        uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
 120}
 121
 122static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
 123{
 124        return uinput_dev_event(dev, EV_FF, effect_id, value);
 125}
 126
 127static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old)
 128{
 129        struct uinput_request request;
 130        int retval;
 131
 132        /*
 133         * uinput driver does not currently support periodic effects with
 134         * custom waveform since it does not have a way to pass buffer of
 135         * samples (custom_data) to userspace. If ever there is a device
 136         * supporting custom waveforms we would need to define an additional
 137         * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
 138         */
 139        if (effect->type == FF_PERIODIC &&
 140                        effect->u.periodic.waveform == FF_CUSTOM)
 141                return -EINVAL;
 142
 143        request.id = -1;
 144        init_completion(&request.done);
 145        request.code = UI_FF_UPLOAD;
 146        request.u.upload.effect = effect;
 147        request.u.upload.old = old;
 148
 149        retval = uinput_request_reserve_slot(input_get_drvdata(dev), &request);
 150        if (!retval)
 151                retval = uinput_request_submit(dev, &request);
 152
 153        return retval;
 154}
 155
 156static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
 157{
 158        struct uinput_request request;
 159        int retval;
 160
 161        if (!test_bit(EV_FF, dev->evbit))
 162                return -ENOSYS;
 163
 164        request.id = -1;
 165        init_completion(&request.done);
 166        request.code = UI_FF_ERASE;
 167        request.u.effect_id = effect_id;
 168
 169        retval = uinput_request_reserve_slot(input_get_drvdata(dev), &request);
 170        if (!retval)
 171                retval = uinput_request_submit(dev, &request);
 172
 173        return retval;
 174}
 175
 176static void uinput_destroy_device(struct uinput_device *udev)
 177{
 178        const char *name, *phys;
 179
 180        if (udev->dev) {
 181                name = udev->dev->name;
 182                phys = udev->dev->phys;
 183                if (udev->state == UIST_CREATED)
 184                        input_unregister_device(udev->dev);
 185                else
 186                        input_free_device(udev->dev);
 187                kfree(name);
 188                kfree(phys);
 189                udev->dev = NULL;
 190        }
 191
 192        udev->state = UIST_NEW_DEVICE;
 193}
 194
 195static int uinput_create_device(struct uinput_device *udev)
 196{
 197        struct input_dev *dev = udev->dev;
 198        int error;
 199
 200        if (udev->state != UIST_SETUP_COMPLETE) {
 201                printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
 202                return -EINVAL;
 203        }
 204
 205        if (udev->ff_effects_max) {
 206                error = input_ff_create(dev, udev->ff_effects_max);
 207                if (error)
 208                        goto fail1;
 209
 210                dev->ff->upload = uinput_dev_upload_effect;
 211                dev->ff->erase = uinput_dev_erase_effect;
 212                dev->ff->playback = uinput_dev_playback;
 213                dev->ff->set_gain = uinput_dev_set_gain;
 214                dev->ff->set_autocenter = uinput_dev_set_autocenter;
 215        }
 216
 217        error = input_register_device(udev->dev);
 218        if (error)
 219                goto fail2;
 220
 221        udev->state = UIST_CREATED;
 222
 223        return 0;
 224
 225 fail2: input_ff_destroy(dev);
 226 fail1: uinput_destroy_device(udev);
 227        return error;
 228}
 229
 230static int uinput_open(struct inode *inode, struct file *file)
 231{
 232        struct uinput_device *newdev;
 233
 234        newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
 235        if (!newdev)
 236                return -ENOMEM;
 237
 238        lock_kernel();
 239        mutex_init(&newdev->mutex);
 240        spin_lock_init(&newdev->requests_lock);
 241        init_waitqueue_head(&newdev->requests_waitq);
 242        init_waitqueue_head(&newdev->waitq);
 243        newdev->state = UIST_NEW_DEVICE;
 244
 245        file->private_data = newdev;
 246        unlock_kernel();
 247
 248        return 0;
 249}
 250
 251static int uinput_validate_absbits(struct input_dev *dev)
 252{
 253        unsigned int cnt;
 254        int retval = 0;
 255
 256        for (cnt = 0; cnt < ABS_MAX + 1; cnt++) {
 257                if (!test_bit(cnt, dev->absbit))
 258                        continue;
 259
 260                if ((dev->absmax[cnt] <= dev->absmin[cnt])) {
 261                        printk(KERN_DEBUG
 262                                "%s: invalid abs[%02x] min:%d max:%d\n",
 263                                UINPUT_NAME, cnt,
 264                                dev->absmin[cnt], dev->absmax[cnt]);
 265                        retval = -EINVAL;
 266                        break;
 267                }
 268
 269                if (dev->absflat[cnt] > (dev->absmax[cnt] - dev->absmin[cnt])) {
 270                        printk(KERN_DEBUG
 271                                "%s: absflat[%02x] out of range: %d "
 272                                "(min:%d/max:%d)\n",
 273                                UINPUT_NAME, cnt, dev->absflat[cnt],
 274                                dev->absmin[cnt], dev->absmax[cnt]);
 275                        retval = -EINVAL;
 276                        break;
 277                }
 278        }
 279        return retval;
 280}
 281
 282static int uinput_allocate_device(struct uinput_device *udev)
 283{
 284        udev->dev = input_allocate_device();
 285        if (!udev->dev)
 286                return -ENOMEM;
 287
 288        udev->dev->event = uinput_dev_event;
 289        input_set_drvdata(udev->dev, udev);
 290
 291        return 0;
 292}
 293
 294static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count)
 295{
 296        struct uinput_user_dev  *user_dev;
 297        struct input_dev        *dev;
 298        char                    *name;
 299        int                     size;
 300        int                     retval;
 301
 302        if (count != sizeof(struct uinput_user_dev))
 303                return -EINVAL;
 304
 305        if (!udev->dev) {
 306                retval = uinput_allocate_device(udev);
 307                if (retval)
 308                        return retval;
 309        }
 310
 311        dev = udev->dev;
 312
 313        user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL);
 314        if (!user_dev)
 315                return -ENOMEM;
 316
 317        if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) {
 318                retval = -EFAULT;
 319                goto exit;
 320        }
 321
 322        udev->ff_effects_max = user_dev->ff_effects_max;
 323
 324        size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1;
 325        if (!size) {
 326                retval = -EINVAL;
 327                goto exit;
 328        }
 329
 330        kfree(dev->name);
 331        dev->name = name = kmalloc(size, GFP_KERNEL);
 332        if (!name) {
 333                retval = -ENOMEM;
 334                goto exit;
 335        }
 336        strlcpy(name, user_dev->name, size);
 337
 338        dev->id.bustype = user_dev->id.bustype;
 339        dev->id.vendor  = user_dev->id.vendor;
 340        dev->id.product = user_dev->id.product;
 341        dev->id.version = user_dev->id.version;
 342
 343        size = sizeof(int) * (ABS_MAX + 1);
 344        memcpy(dev->absmax, user_dev->absmax, size);
 345        memcpy(dev->absmin, user_dev->absmin, size);
 346        memcpy(dev->absfuzz, user_dev->absfuzz, size);
 347        memcpy(dev->absflat, user_dev->absflat, size);
 348
 349        /* check if absmin/absmax/absfuzz/absflat are filled as
 350         * told in Documentation/input/input-programming.txt */
 351        if (test_bit(EV_ABS, dev->evbit)) {
 352                retval = uinput_validate_absbits(dev);
 353                if (retval < 0)
 354                        goto exit;
 355        }
 356
 357        udev->state = UIST_SETUP_COMPLETE;
 358        retval = count;
 359
 360 exit:
 361        kfree(user_dev);
 362        return retval;
 363}
 364
 365static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count)
 366{
 367        struct input_event ev;
 368
 369        if (count < input_event_size())
 370                return -EINVAL;
 371
 372        if (input_event_from_user(buffer, &ev))
 373                return -EFAULT;
 374
 375        input_event(udev->dev, ev.type, ev.code, ev.value);
 376
 377        return input_event_size();
 378}
 379
 380static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 381{
 382        struct uinput_device *udev = file->private_data;
 383        int retval;
 384
 385        retval = mutex_lock_interruptible(&udev->mutex);
 386        if (retval)
 387                return retval;
 388
 389        retval = udev->state == UIST_CREATED ?
 390                        uinput_inject_event(udev, buffer, count) :
 391                        uinput_setup_device(udev, buffer, count);
 392
 393        mutex_unlock(&udev->mutex);
 394
 395        return retval;
 396}
 397
 398static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 399{
 400        struct uinput_device *udev = file->private_data;
 401        int retval = 0;
 402
 403        if (udev->state != UIST_CREATED)
 404                return -ENODEV;
 405
 406        if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
 407                return -EAGAIN;
 408
 409        retval = wait_event_interruptible(udev->waitq,
 410                        udev->head != udev->tail || udev->state != UIST_CREATED);
 411        if (retval)
 412                return retval;
 413
 414        retval = mutex_lock_interruptible(&udev->mutex);
 415        if (retval)
 416                return retval;
 417
 418        if (udev->state != UIST_CREATED) {
 419                retval = -ENODEV;
 420                goto out;
 421        }
 422
 423        while (udev->head != udev->tail && retval + input_event_size() <= count) {
 424                if (input_event_to_user(buffer + retval, &udev->buff[udev->tail])) {
 425                        retval = -EFAULT;
 426                        goto out;
 427                }
 428                udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
 429                retval += input_event_size();
 430        }
 431
 432 out:
 433        mutex_unlock(&udev->mutex);
 434
 435        return retval;
 436}
 437
 438static unsigned int uinput_poll(struct file *file, poll_table *wait)
 439{
 440        struct uinput_device *udev = file->private_data;
 441
 442        poll_wait(file, &udev->waitq, wait);
 443
 444        if (udev->head != udev->tail)
 445                return POLLIN | POLLRDNORM;
 446
 447        return 0;
 448}
 449
 450static int uinput_release(struct inode *inode, struct file *file)
 451{
 452        struct uinput_device *udev = file->private_data;
 453
 454        uinput_destroy_device(udev);
 455        kfree(udev);
 456
 457        return 0;
 458}
 459
 460#ifdef CONFIG_COMPAT
 461struct uinput_ff_upload_compat {
 462        int                     request_id;
 463        int                     retval;
 464        struct ff_effect_compat effect;
 465        struct ff_effect_compat old;
 466};
 467
 468static int uinput_ff_upload_to_user(char __user *buffer,
 469                                    const struct uinput_ff_upload *ff_up)
 470{
 471        if (INPUT_COMPAT_TEST) {
 472                struct uinput_ff_upload_compat ff_up_compat;
 473
 474                ff_up_compat.request_id = ff_up->request_id;
 475                ff_up_compat.retval = ff_up->retval;
 476                /*
 477                 * It so happens that the pointer that gives us the trouble
 478                 * is the last field in the structure. Since we don't support
 479                 * custom waveforms in uinput anyway we can just copy the whole
 480                 * thing (to the compat size) and ignore the pointer.
 481                 */
 482                memcpy(&ff_up_compat.effect, &ff_up->effect,
 483                        sizeof(struct ff_effect_compat));
 484                memcpy(&ff_up_compat.old, &ff_up->old,
 485                        sizeof(struct ff_effect_compat));
 486
 487                if (copy_to_user(buffer, &ff_up_compat,
 488                                 sizeof(struct uinput_ff_upload_compat)))
 489                        return -EFAULT;
 490        } else {
 491                if (copy_to_user(buffer, ff_up,
 492                                 sizeof(struct uinput_ff_upload)))
 493                        return -EFAULT;
 494        }
 495
 496        return 0;
 497}
 498
 499static int uinput_ff_upload_from_user(const char __user *buffer,
 500                                      struct uinput_ff_upload *ff_up)
 501{
 502        if (INPUT_COMPAT_TEST) {
 503                struct uinput_ff_upload_compat ff_up_compat;
 504
 505                if (copy_from_user(&ff_up_compat, buffer,
 506                                   sizeof(struct uinput_ff_upload_compat)))
 507                        return -EFAULT;
 508
 509                ff_up->request_id = ff_up_compat.request_id;
 510                ff_up->retval = ff_up_compat.retval;
 511                memcpy(&ff_up->effect, &ff_up_compat.effect,
 512                        sizeof(struct ff_effect_compat));
 513                memcpy(&ff_up->old, &ff_up_compat.old,
 514                        sizeof(struct ff_effect_compat));
 515
 516        } else {
 517                if (copy_from_user(ff_up, buffer,
 518                                   sizeof(struct uinput_ff_upload)))
 519                        return -EFAULT;
 520        }
 521
 522        return 0;
 523}
 524
 525#else
 526
 527static int uinput_ff_upload_to_user(char __user *buffer,
 528                                    const struct uinput_ff_upload *ff_up)
 529{
 530        if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
 531                return -EFAULT;
 532
 533        return 0;
 534}
 535
 536static int uinput_ff_upload_from_user(const char __user *buffer,
 537                                      struct uinput_ff_upload *ff_up)
 538{
 539        if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
 540                return -EFAULT;
 541
 542        return 0;
 543}
 544
 545#endif
 546
 547#define uinput_set_bit(_arg, _bit, _max)                \
 548({                                                      \
 549        int __ret = 0;                                  \
 550        if (udev->state == UIST_CREATED)                \
 551                __ret =  -EINVAL;                       \
 552        else if ((_arg) > (_max))                       \
 553                __ret = -EINVAL;                        \
 554        else set_bit((_arg), udev->dev->_bit);          \
 555        __ret;                                          \
 556})
 557
 558static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
 559                                 unsigned long arg, void __user *p)
 560{
 561        int                     retval;
 562        struct uinput_device    *udev = file->private_data;
 563        struct uinput_ff_upload ff_up;
 564        struct uinput_ff_erase  ff_erase;
 565        struct uinput_request   *req;
 566        int                     length;
 567        char                    *phys;
 568
 569        retval = mutex_lock_interruptible(&udev->mutex);
 570        if (retval)
 571                return retval;
 572
 573        if (!udev->dev) {
 574                retval = uinput_allocate_device(udev);
 575                if (retval)
 576                        goto out;
 577        }
 578
 579        switch (cmd) {
 580                case UI_DEV_CREATE:
 581                        retval = uinput_create_device(udev);
 582                        break;
 583
 584                case UI_DEV_DESTROY:
 585                        uinput_destroy_device(udev);
 586                        break;
 587
 588                case UI_SET_EVBIT:
 589                        retval = uinput_set_bit(arg, evbit, EV_MAX);
 590                        break;
 591
 592                case UI_SET_KEYBIT:
 593                        retval = uinput_set_bit(arg, keybit, KEY_MAX);
 594                        break;
 595
 596                case UI_SET_RELBIT:
 597                        retval = uinput_set_bit(arg, relbit, REL_MAX);
 598                        break;
 599
 600                case UI_SET_ABSBIT:
 601                        retval = uinput_set_bit(arg, absbit, ABS_MAX);
 602                        break;
 603
 604                case UI_SET_MSCBIT:
 605                        retval = uinput_set_bit(arg, mscbit, MSC_MAX);
 606                        break;
 607
 608                case UI_SET_LEDBIT:
 609                        retval = uinput_set_bit(arg, ledbit, LED_MAX);
 610                        break;
 611
 612                case UI_SET_SNDBIT:
 613                        retval = uinput_set_bit(arg, sndbit, SND_MAX);
 614                        break;
 615
 616                case UI_SET_FFBIT:
 617                        retval = uinput_set_bit(arg, ffbit, FF_MAX);
 618                        break;
 619
 620                case UI_SET_SWBIT:
 621                        retval = uinput_set_bit(arg, swbit, SW_MAX);
 622                        break;
 623
 624                case UI_SET_PHYS:
 625                        if (udev->state == UIST_CREATED) {
 626                                retval = -EINVAL;
 627                                goto out;
 628                        }
 629                        length = strnlen_user(p, 1024);
 630                        if (length <= 0) {
 631                                retval = -EFAULT;
 632                                break;
 633                        }
 634                        kfree(udev->dev->phys);
 635                        udev->dev->phys = phys = kmalloc(length, GFP_KERNEL);
 636                        if (!phys) {
 637                                retval = -ENOMEM;
 638                                break;
 639                        }
 640                        if (copy_from_user(phys, p, length)) {
 641                                udev->dev->phys = NULL;
 642                                kfree(phys);
 643                                retval = -EFAULT;
 644                                break;
 645                        }
 646                        phys[length - 1] = '\0';
 647                        break;
 648
 649                case UI_BEGIN_FF_UPLOAD:
 650                        retval = uinput_ff_upload_from_user(p, &ff_up);
 651                        if (retval)
 652                                break;
 653
 654                        req = uinput_request_find(udev, ff_up.request_id);
 655                        if (!req || req->code != UI_FF_UPLOAD || !req->u.upload.effect) {
 656                                retval = -EINVAL;
 657                                break;
 658                        }
 659
 660                        ff_up.retval = 0;
 661                        ff_up.effect = *req->u.upload.effect;
 662                        if (req->u.upload.old)
 663                                ff_up.old = *req->u.upload.old;
 664                        else
 665                                memset(&ff_up.old, 0, sizeof(struct ff_effect));
 666
 667                        retval = uinput_ff_upload_to_user(p, &ff_up);
 668                        break;
 669
 670                case UI_BEGIN_FF_ERASE:
 671                        if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 672                                retval = -EFAULT;
 673                                break;
 674                        }
 675
 676                        req = uinput_request_find(udev, ff_erase.request_id);
 677                        if (!req || req->code != UI_FF_ERASE) {
 678                                retval = -EINVAL;
 679                                break;
 680                        }
 681
 682                        ff_erase.retval = 0;
 683                        ff_erase.effect_id = req->u.effect_id;
 684                        if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
 685                                retval = -EFAULT;
 686                                break;
 687                        }
 688
 689                        break;
 690
 691                case UI_END_FF_UPLOAD:
 692                        retval = uinput_ff_upload_from_user(p, &ff_up);
 693                        if (retval)
 694                                break;
 695
 696                        req = uinput_request_find(udev, ff_up.request_id);
 697                        if (!req || req->code != UI_FF_UPLOAD ||
 698                            !req->u.upload.effect) {
 699                                retval = -EINVAL;
 700                                break;
 701                        }
 702
 703                        req->retval = ff_up.retval;
 704                        uinput_request_done(udev, req);
 705                        break;
 706
 707                case UI_END_FF_ERASE:
 708                        if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
 709                                retval = -EFAULT;
 710                                break;
 711                        }
 712
 713                        req = uinput_request_find(udev, ff_erase.request_id);
 714                        if (!req || req->code != UI_FF_ERASE) {
 715                                retval = -EINVAL;
 716                                break;
 717                        }
 718
 719                        req->retval = ff_erase.retval;
 720                        uinput_request_done(udev, req);
 721                        break;
 722
 723                default:
 724                        retval = -EINVAL;
 725        }
 726
 727 out:
 728        mutex_unlock(&udev->mutex);
 729        return retval;
 730}
 731
 732static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 733{
 734        return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
 735}
 736
 737#ifdef CONFIG_COMPAT
 738static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 739{
 740        return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
 741}
 742#endif
 743
 744static const struct file_operations uinput_fops = {
 745        .owner          = THIS_MODULE,
 746        .open           = uinput_open,
 747        .release        = uinput_release,
 748        .read           = uinput_read,
 749        .write          = uinput_write,
 750        .poll           = uinput_poll,
 751        .unlocked_ioctl = uinput_ioctl,
 752#ifdef CONFIG_COMPAT
 753        .compat_ioctl   = uinput_compat_ioctl,
 754#endif
 755};
 756
 757static struct miscdevice uinput_misc = {
 758        .fops           = &uinput_fops,
 759        .minor          = UINPUT_MINOR,
 760        .name           = UINPUT_NAME,
 761};
 762
 763static int __init uinput_init(void)
 764{
 765        return misc_register(&uinput_misc);
 766}
 767
 768static void __exit uinput_exit(void)
 769{
 770        misc_deregister(&uinput_misc);
 771}
 772
 773MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
 774MODULE_DESCRIPTION("User level driver support for input subsystem");
 775MODULE_LICENSE("GPL");
 776MODULE_VERSION("0.3");
 777
 778module_init(uinput_init);
 779module_exit(uinput_exit);
 780
 781