drivers/hid/usbhid/hiddev.c

   1 /*
   2  *  Copyright (c) 2001 Paul Stewart
   3  *  Copyright (c) 2001 Vojtech Pavlik
   4  *
   5  *  HID char devices, giving access to raw HID device events.
   6  *
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  *
  24  * Should you need to contact me, the author, you can do so either by
  25  * e-mail - mail your message to Paul Stewart <stewart@wetlogic.net>
  26  */
  27
  28 #include <linux/poll.h>
  29 #include <linux/slab.h>
  30 #include <linux/sched/signal.h>
  31 #include <linux/module.h>
  32 #include <linux/init.h>
  33 #include <linux/input.h>
  34 #include <linux/usb.h>
  35 #include <linux/hid.h>
  36 #include <linux/hiddev.h>
  37 #include <linux/compat.h>
  38 #include <linux/vmalloc.h>
  39 #include <linux/nospec.h>
  40 #include "usbhid.h"
  41
  42 #ifdef CONFIG_USB_DYNAMIC_MINORS
  43 #define HIDDEV_MINOR_BASE       0
  44 #define HIDDEV_MINORS           256
  45 #else
  46 #define HIDDEV_MINOR_BASE       96
  47 #define HIDDEV_MINORS           16
  48 #endif
  49 #define HIDDEV_BUFFER_SIZE      2048
  50
  51 struct hiddev_list {
  52         struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE];
  53         int head;
  54         int tail;
  55         unsigned flags;
  56         struct fasync_struct *fasync;
  57         struct hiddev *hiddev;
  58         struct list_head node;
  59         struct mutex thread_lock;
  60 };
  61
  62 /*
  63  * Find a report, given the report's type and ID.  The ID can be specified
  64  * indirectly by REPORT_ID_FIRST (which returns the first report of the given
  65  * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the
  66  * given type which follows old_id.
  67  */
  68 static struct hid_report *
  69 hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo)
  70 {
  71         unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK;
  72         unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK;
  73         struct hid_report_enum *report_enum;
  74         struct hid_report *report;
  75         struct list_head *list;
  76
  77         if (rinfo->report_type < HID_REPORT_TYPE_MIN ||
  78             rinfo->report_type > HID_REPORT_TYPE_MAX)
  79                 return NULL;
  80
  81         report_enum = hid->report_enum +
  82                 (rinfo->report_type - HID_REPORT_TYPE_MIN);
  83
  84         switch (flags) {
  85         case 0: /* Nothing to do -- report_id is already set correctly */
  86                 break;
  87
  88         case HID_REPORT_ID_FIRST:
  89                 if (list_empty(&report_enum->report_list))
  90                         return NULL;
  91
  92                 list = report_enum->report_list.next;
  93                 report = list_entry(list, struct hid_report, list);
  94                 rinfo->report_id = report->id;
  95                 break;
  96
  97         case HID_REPORT_ID_NEXT:
  98                 report = report_enum->report_id_hash[rid];
  99                 if (!report)
 100                         return NULL;
 101
 102                 list = report->list.next;
 103                 if (list == &report_enum->report_list)
 104                         return NULL;
 105
 106                 report = list_entry(list, struct hid_report, list);
 107                 rinfo->report_id = report->id;
 108                 break;
 109
 110         default:
 111                 return NULL;
 112         }
 113
 114         return report_enum->report_id_hash[rinfo->report_id];
 115 }
 116
 117 /*
 118  * Perform an exhaustive search of the report table for a usage, given its
 119  * type and usage id.
 120  */
 121 static struct hid_field *
 122 hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref)
 123 {
 124         int i, j;
 125         struct hid_report *report;
 126         struct hid_report_enum *report_enum;
 127         struct hid_field *field;
 128
 129         if (uref->report_type < HID_REPORT_TYPE_MIN ||
 130             uref->report_type > HID_REPORT_TYPE_MAX)
 131                 return NULL;
 132
 133         report_enum = hid->report_enum +
 134                 (uref->report_type - HID_REPORT_TYPE_MIN);
 135
 136         list_for_each_entry(report, &report_enum->report_list, list) {
 137                 for (i = 0; i < report->maxfield; i++) {
 138                         field = report->field[i];
 139                         for (j = 0; j < field->maxusage; j++) {
 140                                 if (field->usage[j].hid == uref->usage_code) {
 141                                         uref->report_id = report->id;
 142                                         uref->field_index = i;
 143                                         uref->usage_index = j;
 144                                         return field;
 145                                 }
 146                         }
 147                 }
 148         }
 149
 150         return NULL;
 151 }
 152
 153 static void hiddev_send_event(struct hid_device *hid,
 154                               struct hiddev_usage_ref *uref)
 155 {
 156         struct hiddev *hiddev = hid->hiddev;
 157         struct hiddev_list *list;
 158         unsigned long flags;
 159
 160         spin_lock_irqsave(&hiddev->list_lock, flags);
 161         list_for_each_entry(list, &hiddev->list, node) {
 162                 if (uref->field_index != HID_FIELD_INDEX_NONE ||
 163                     (list->flags & HIDDEV_FLAG_REPORT) != 0) {
 164                         list->buffer[list->head] = *uref;
 165                         list->head = (list->head + 1) &
 166                                 (HIDDEV_BUFFER_SIZE - 1);
 167                         kill_fasync(&list->fasync, SIGIO, POLL_IN);
 168                 }
 169         }
 170         spin_unlock_irqrestore(&hiddev->list_lock, flags);
 171
 172         wake_up_interruptible(&hiddev->wait);
 173 }
 174
 175 /*
 176  * This is where hid.c calls into hiddev to pass an event that occurred over
 177  * the interrupt pipe
 178  */
 179 void hiddev_hid_event(struct hid_device *hid, struct hid_field *field,
 180                       struct hid_usage *usage, __s32 value)
 181 {
 182         unsigned type = field->report_type;
 183         struct hiddev_usage_ref uref;
 184
 185         uref.report_type =
 186           (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
 187           ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
 188            ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
 189         uref.report_id = field->report->id;
 190         uref.field_index = field->index;
 191         uref.usage_index = (usage - field->usage);
 192         uref.usage_code = usage->hid;
 193         uref.value = value;
 194
 195         hiddev_send_event(hid, &uref);
 196 }
 197 EXPORT_SYMBOL_GPL(hiddev_hid_event);
 198
 199 void hiddev_report_event(struct hid_device *hid, struct hid_report *report)
 200 {
 201         unsigned type = report->type;
 202         struct hiddev_usage_ref uref;
 203
 204         memset(&uref, 0, sizeof(uref));
 205         uref.report_type =
 206           (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
 207           ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
 208            ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
 209         uref.report_id = report->id;
 210         uref.field_index = HID_FIELD_INDEX_NONE;
 211
 212         hiddev_send_event(hid, &uref);
 213 }
 214
 215 /*
 216  * fasync file op
 217  */
 218 static int hiddev_fasync(int fd, struct file *file, int on)
 219 {
 220         struct hiddev_list *list = file->private_data;
 221
 222         return fasync_helper(fd, file, on, &list->fasync);
 223 }
 224
 225
 226 /*
 227  * release file op
 228  */
 229 static int hiddev_release(struct inode * inode, struct file * file)
 230 {
 231         struct hiddev_list *list = file->private_data;
 232         unsigned long flags;
 233
 234         spin_lock_irqsave(&list->hiddev->list_lock, flags);
 235         list_del(&list->node);
 236         spin_unlock_irqrestore(&list->hiddev->list_lock, flags);
 237
 238         mutex_lock(&list->hiddev->existancelock);
 239         if (!--list->hiddev->open) {
 240                 if (list->hiddev->exist) {
 241                         hid_hw_close(list->hiddev->hid);
 242                         hid_hw_power(list->hiddev->hid, PM_HINT_NORMAL);
 243                 } else {
 244                         mutex_unlock(&list->hiddev->existancelock);
 245                         kfree(list->hiddev);
 246                         vfree(list);
 247                         return 0;
 248                 }
 249         }
 250
 251         mutex_unlock(&list->hiddev->existancelock);
 252         vfree(list);
 253
 254         return 0;
 255 }
 256
 257 /*
 258  * open file op
 259  */
 260 static int hiddev_open(struct inode *inode, struct file *file)
 261 {
 262         struct hiddev_list *list;
 263         struct usb_interface *intf;
 264         struct hid_device *hid;
 265         struct hiddev *hiddev;
 266         int res;
 267
 268         intf = usbhid_find_interface(iminor(inode));
 269         if (!intf)
 270                 return -ENODEV;
 271         hid = usb_get_intfdata(intf);
 272         hiddev = hid->hiddev;
 273
 274         if (!(list = vzalloc(sizeof(struct hiddev_list))))
 275                 return -ENOMEM;
 276         mutex_init(&list->thread_lock);
 277         list->hiddev = hiddev;
 278         file->private_data = list;
 279
 280         /*
 281          * no need for locking because the USB major number
 282          * is shared which usbcore guards against disconnect
 283          */
 284         if (list->hiddev->exist) {
 285                 if (!list->hiddev->open++) {
 286                         res = hid_hw_open(hiddev->hid);
 287                         if (res < 0)
 288                                 goto bail;
 289                 }
 290         } else {
 291                 res = -ENODEV;
 292                 goto bail;
 293         }
 294
 295         spin_lock_irq(&list->hiddev->list_lock);
 296         list_add_tail(&list->node, &hiddev->list);
 297         spin_unlock_irq(&list->hiddev->list_lock);
 298
 299         mutex_lock(&hiddev->existancelock);
 300         if (!list->hiddev->open++)
 301                 if (list->hiddev->exist) {
 302                         struct hid_device *hid = hiddev->hid;
 303                         res = hid_hw_power(hid, PM_HINT_FULLON);
 304                         if (res < 0)
 305                                 goto bail_unlock;
 306                         res = hid_hw_open(hid);
 307                         if (res < 0)
 308                                 goto bail_normal_power;
 309                 }
 310         mutex_unlock(&hiddev->existancelock);
 311         return 0;
 312 bail_normal_power:
 313         hid_hw_power(hid, PM_HINT_NORMAL);
 314 bail_unlock:
 315         mutex_unlock(&hiddev->existancelock);
 316 bail:
 317         file->private_data = NULL;
 318         vfree(list);
 319         return res;
 320 }
 321
 322 /*
 323  * "write" file op
 324  */
 325 static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
 326 {
 327         return -EINVAL;
 328 }
 329
 330 /*
 331  * "read" file op
 332  */
 333 static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
 334 {
 335         DEFINE_WAIT(wait);
 336         struct hiddev_list *list = file->private_data;
 337         int event_size;
 338         int retval;
 339
 340         event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ?
 341                 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event);
 342
 343         if (count < event_size)
 344                 return 0;
 345
 346         /* lock against other threads */
 347         retval = mutex_lock_interruptible(&list->thread_lock);
 348         if (retval)
 349                 return -ERESTARTSYS;
 350
 351         while (retval == 0) {
 352                 if (list->head == list->tail) {
 353                         prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE);
 354
 355                         while (list->head == list->tail) {
 356                                 if (signal_pending(current)) {
 357                                         retval = -ERESTARTSYS;
 358                                         break;
 359                                 }
 360                                 if (!list->hiddev->exist) {
 361                                         retval = -EIO;
 362                                         break;
 363                                 }
 364                                 if (file->f_flags & O_NONBLOCK) {
 365                                         retval = -EAGAIN;
 366                                         break;
 367                                 }
 368
 369                                 /* let O_NONBLOCK tasks run */
 370                                 mutex_unlock(&list->thread_lock);
 371                                 schedule();
 372                                 if (mutex_lock_interruptible(&list->thread_lock)) {
 373                                         finish_wait(&list->hiddev->wait, &wait);
 374                                         return -EINTR;
 375                                 }
 376                                 set_current_state(TASK_INTERRUPTIBLE);
 377                         }
 378                         finish_wait(&list->hiddev->wait, &wait);
 379
 380                 }
 381
 382                 if (retval) {
 383                         mutex_unlock(&list->thread_lock);
 384                         return retval;
 385                 }
 386
 387
 388                 while (list->head != list->tail &&
 389                        retval + event_size <= count) {
 390                         if ((list->flags & HIDDEV_FLAG_UREF) == 0) {
 391                                 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) {
 392                                         struct hiddev_event event;
 393
 394                                         event.hid = list->buffer[list->tail].usage_code;
 395                                         event.value = list->buffer[list->tail].value;
 396                                         if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) {
 397                                                 mutex_unlock(&list->thread_lock);
 398                                                 return -EFAULT;
 399                                         }
 400                                         retval += sizeof(struct hiddev_event);
 401                                 }
 402                         } else {
 403                                 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE ||
 404                                     (list->flags & HIDDEV_FLAG_REPORT) != 0) {
 405
 406                                         if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) {
 407                                                 mutex_unlock(&list->thread_lock);
 408                                                 return -EFAULT;
 409                                         }
 410                                         retval += sizeof(struct hiddev_usage_ref);
 411                                 }
 412                         }
 413                         list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1);
 414                 }
 415
 416         }
 417         mutex_unlock(&list->thread_lock);
 418
 419         return retval;
 420 }
 421
 422 /*
 423  * "poll" file op
 424  * No kernel lock - fine
 425  */
 426 static __poll_t hiddev_poll(struct file *file, poll_table *wait)
 427 {
 428         struct hiddev_list *list = file->private_data;
 429
 430         poll_wait(file, &list->hiddev->wait, wait);
 431         if (list->head != list->tail)
 432                 return EPOLLIN | EPOLLRDNORM;
 433         if (!list->hiddev->exist)
 434                 return EPOLLERR | EPOLLHUP;
 435         return 0;
 436 }
 437
 438 /*
 439  * "ioctl" file op
 440  */
 441 static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
 442 {
 443         struct hid_device *hid = hiddev->hid;
 444         struct hiddev_report_info rinfo;
 445         struct hiddev_usage_ref_multi *uref_multi = NULL;
 446         struct hiddev_usage_ref *uref;
 447         struct hid_report *report;
 448         struct hid_field *field;
 449         int i;
 450
 451         uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL);
 452         if (!uref_multi)
 453                 return -ENOMEM;
 454         uref = &uref_multi->uref;
 455         if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
 456                 if (copy_from_user(uref_multi, user_arg,
 457                                    sizeof(*uref_multi)))
 458                         goto fault;
 459         } else {
 460                 if (copy_from_user(uref, user_arg, sizeof(*uref)))
 461                         goto fault;
 462         }
 463
 464         switch (cmd) {
 465         case HIDIOCGUCODE:
 466                 rinfo.report_type = uref->report_type;
 467                 rinfo.report_id = uref->report_id;
 468                 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
 469                         goto inval;
 470
 471                 if (uref->field_index >= report->maxfield)
 472                         goto inval;
 473                 uref->field_index = array_index_nospec(uref->field_index,
 474                                                        report->maxfield);
 475
 476                 field = report->field[uref->field_index];
 477                 if (uref->usage_index >= field->maxusage)
 478                         goto inval;
 479                 uref->usage_index = array_index_nospec(uref->usage_index,
 480                                                        field->maxusage);
 481
 482                 uref->usage_code = field->usage[uref->usage_index].hid;
 483
 484                 if (copy_to_user(user_arg, uref, sizeof(*uref)))
 485                         goto fault;
 486
 487                 goto goodreturn;
 488
 489         default:
 490                 if (cmd != HIDIOCGUSAGE &&
 491                     cmd != HIDIOCGUSAGES &&
 492                     uref->report_type == HID_REPORT_TYPE_INPUT)
 493                         goto inval;
 494
 495                 if (uref->report_id == HID_REPORT_ID_UNKNOWN) {
 496                         field = hiddev_lookup_usage(hid, uref);
 497                         if (field == NULL)
 498                                 goto inval;
 499                 } else {
 500                         rinfo.report_type = uref->report_type;
 501                         rinfo.report_id = uref->report_id;
 502                         if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
 503                                 goto inval;
 504
 505                         if (uref->field_index >= report->maxfield)
 506                                 goto inval;
 507                         uref->field_index = array_index_nospec(uref->field_index,
 508                                                                report->maxfield);
 509
 510                         field = report->field[uref->field_index];
 511
 512                         if (cmd == HIDIOCGCOLLECTIONINDEX) {
 513                                 if (uref->usage_index >= field->maxusage)
 514                                         goto inval;
 515                                 uref->usage_index =
 516                                         array_index_nospec(uref->usage_index,
 517                                                            field->maxusage);
 518                         } else if (uref->usage_index >= field->report_count)
 519                                 goto inval;
 520                 }
 521
 522                 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
 523                         if (uref_multi->num_values > HID_MAX_MULTI_USAGES ||
 524                             uref->usage_index + uref_multi->num_values >
 525                             field->report_count)
 526                                 goto inval;
 527
 528                         uref->usage_index =
 529                                 array_index_nospec(uref->usage_index,
 530                                                    field->report_count -
 531                                                    uref_multi->num_values);
 532                 }
 533
 534                 switch (cmd) {
 535                 case HIDIOCGUSAGE:
 536                         uref->value = field->value[uref->usage_index];
 537                         if (copy_to_user(user_arg, uref, sizeof(*uref)))
 538                                 goto fault;
 539                         goto goodreturn;
 540
 541                 case HIDIOCSUSAGE:
 542                         field->value[uref->usage_index] = uref->value;
 543                         goto goodreturn;
 544
 545                 case HIDIOCGCOLLECTIONINDEX:
 546                         i = field->usage[uref->usage_index].collection_index;
 547                         kfree(uref_multi);
 548                         return i;
 549                 case HIDIOCGUSAGES:
 550                         for (i = 0; i < uref_multi->num_values; i++)
 551                                 uref_multi->values[i] =
 552                                     field->value[uref->usage_index + i];
 553                         if (copy_to_user(user_arg, uref_multi,
 554                                          sizeof(*uref_multi)))
 555                                 goto fault;
 556                         goto goodreturn;
 557                 case HIDIOCSUSAGES:
 558                         for (i = 0; i < uref_multi->num_values; i++)
 559                                 field->value[uref->usage_index + i] =
 560                                     uref_multi->values[i];
 561                         goto goodreturn;
 562                 }
 563
 564 goodreturn:
 565                 kfree(uref_multi);
 566                 return 0;
 567 fault:
 568                 kfree(uref_multi);
 569                 return -EFAULT;
 570 inval:
 571                 kfree(uref_multi);
 572                 return -EINVAL;
 573         }
 574 }
 575
 576 static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
 577 {
 578         struct hid_device *hid = hiddev->hid;
 579         struct usb_device *dev = hid_to_usb_dev(hid);
 580         int idx, len;
 581         char *buf;
 582
 583         if (get_user(idx, (int __user *)user_arg))
 584                 return -EFAULT;
 585
 586         if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL)
 587                 return -ENOMEM;
 588
 589         if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) {
 590                 kfree(buf);
 591                 return -EINVAL;
 592         }
 593
 594         if (copy_to_user(user_arg+sizeof(int), buf, len+1)) {
 595                 kfree(buf);
 596                 return -EFAULT;
 597         }
 598
 599         kfree(buf);
 600
 601         return len;
 602 }
 603
 604 static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 605 {
 606         struct hiddev_list *list = file->private_data;
 607         struct hiddev *hiddev = list->hiddev;
 608         struct hid_device *hid;
 609         struct hiddev_collection_info cinfo;
 610         struct hiddev_report_info rinfo;
 611         struct hiddev_field_info finfo;
 612         struct hiddev_devinfo dinfo;
 613         struct hid_report *report;
 614         struct hid_field *field;
 615         void __user *user_arg = (void __user *)arg;
 616         int i, r = -EINVAL;
 617
 618         /* Called without BKL by compat methods so no BKL taken */
 619
 620         mutex_lock(&hiddev->existancelock);
 621         if (!hiddev->exist) {
 622                 r = -ENODEV;
 623                 goto ret_unlock;
 624         }
 625
 626         hid = hiddev->hid;
 627
 628         switch (cmd) {
 629
 630         case HIDIOCGVERSION:
 631                 r = put_user(HID_VERSION, (int __user *)arg) ?
 632                         -EFAULT : 0;
 633                 break;
 634
 635         case HIDIOCAPPLICATION:
 636                 if (arg >= hid->maxapplication)
 637                         break;
 638
 639                 for (i = 0; i < hid->maxcollection; i++)
 640                         if (hid->collection[i].type ==
 641                             HID_COLLECTION_APPLICATION && arg-- == 0)
 642                                 break;
 643
 644                 if (i < hid->maxcollection)
 645                         r = hid->collection[i].usage;
 646                 break;
 647
 648         case HIDIOCGDEVINFO:
 649                 {
 650                         struct usb_device *dev = hid_to_usb_dev(hid);
 651                         struct usbhid_device *usbhid = hid->driver_data;
 652
 653                         memset(&dinfo, 0, sizeof(dinfo));
 654
 655                         dinfo.bustype = BUS_USB;
 656                         dinfo.busnum = dev->bus->busnum;
 657                         dinfo.devnum = dev->devnum;
 658                         dinfo.ifnum = usbhid->ifnum;
 659                         dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor);
 660                         dinfo.product = le16_to_cpu(dev->descriptor.idProduct);
 661                         dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice);
 662                         dinfo.num_applications = hid->maxapplication;
 663
 664                         r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ?
 665                                 -EFAULT : 0;
 666                         break;
 667                 }
 668
 669         case HIDIOCGFLAG:
 670                 r = put_user(list->flags, (int __user *)arg) ?
 671                         -EFAULT : 0;
 672                 break;
 673
 674         case HIDIOCSFLAG:
 675                 {
 676                         int newflags;
 677
 678                         if (get_user(newflags, (int __user *)arg)) {
 679                                 r = -EFAULT;
 680                                 break;
 681                         }
 682
 683                         if ((newflags & ~HIDDEV_FLAGS) != 0 ||
 684                             ((newflags & HIDDEV_FLAG_REPORT) != 0 &&
 685                              (newflags & HIDDEV_FLAG_UREF) == 0))
 686                                 break;
 687
 688                         list->flags = newflags;
 689
 690                         r = 0;
 691                         break;
 692                 }
 693
 694         case HIDIOCGSTRING:
 695                 r = hiddev_ioctl_string(hiddev, cmd, user_arg);
 696                 break;
 697
 698         case HIDIOCINITREPORT:
 699                 usbhid_init_reports(hid);
 700                 hiddev->initialized = true;
 701                 r = 0;
 702                 break;
 703
 704         case HIDIOCGREPORT:
 705                 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
 706                         r = -EFAULT;
 707                         break;
 708                 }
 709
 710                 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT)
 711                         break;
 712
 713                 report = hiddev_lookup_report(hid, &rinfo);
 714                 if (report == NULL)
 715                         break;
 716
 717                 hid_hw_request(hid, report, HID_REQ_GET_REPORT);
 718                 hid_hw_wait(hid);
 719
 720                 r = 0;
 721                 break;
 722
 723         case HIDIOCSREPORT:
 724                 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
 725                         r = -EFAULT;
 726                         break;
 727                 }
 728
 729                 if (rinfo.report_type == HID_REPORT_TYPE_INPUT)
 730                         break;
 731
 732                 report = hiddev_lookup_report(hid, &rinfo);
 733                 if (report == NULL)
 734                         break;
 735
 736                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 737                 hid_hw_wait(hid);
 738
 739                 r = 0;
 740                 break;
 741
 742         case HIDIOCGREPORTINFO:
 743                 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
 744                         r = -EFAULT;
 745                         break;
 746                 }
 747
 748                 report = hiddev_lookup_report(hid, &rinfo);
 749                 if (report == NULL)
 750                         break;
 751
 752                 rinfo.num_fields = report->maxfield;
 753
 754                 r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ?
 755                         -EFAULT : 0;
 756                 break;
 757
 758         case HIDIOCGFIELDINFO:
 759                 if (copy_from_user(&finfo, user_arg, sizeof(finfo))) {
 760                         r = -EFAULT;
 761                         break;
 762                 }
 763
 764                 rinfo.report_type = finfo.report_type;
 765                 rinfo.report_id = finfo.report_id;
 766
 767                 report = hiddev_lookup_report(hid, &rinfo);
 768                 if (report == NULL)
 769                         break;
 770
 771                 if (finfo.field_index >= report->maxfield)
 772                         break;
 773                 finfo.field_index = array_index_nospec(finfo.field_index,
 774                                                        report->maxfield);
 775
 776                 field = report->field[finfo.field_index];
 777                 memset(&finfo, 0, sizeof(finfo));
 778                 finfo.report_type = rinfo.report_type;
 779                 finfo.report_id = rinfo.report_id;
 780                 finfo.field_index = field->report_count - 1;
 781                 finfo.maxusage = field->maxusage;
 782                 finfo.flags = field->flags;
 783                 finfo.physical = field->physical;
 784                 finfo.logical = field->logical;
 785                 finfo.application = field->application;
 786                 finfo.logical_minimum = field->logical_minimum;
 787                 finfo.logical_maximum = field->logical_maximum;
 788                 finfo.physical_minimum = field->physical_minimum;
 789                 finfo.physical_maximum = field->physical_maximum;
 790                 finfo.unit_exponent = field->unit_exponent;
 791                 finfo.unit = field->unit;
 792
 793                 r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ?
 794                         -EFAULT : 0;
 795                 break;
 796
 797         case HIDIOCGUCODE:
 798                 /* fall through */
 799         case HIDIOCGUSAGE:
 800         case HIDIOCSUSAGE:
 801         case HIDIOCGUSAGES:
 802         case HIDIOCSUSAGES:
 803         case HIDIOCGCOLLECTIONINDEX:
 804                 if (!hiddev->initialized) {
 805                         usbhid_init_reports(hid);
 806                         hiddev->initialized = true;
 807                 }
 808                 r = hiddev_ioctl_usage(hiddev, cmd, user_arg);
 809                 break;
 810
 811         case HIDIOCGCOLLECTIONINFO:
 812                 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) {
 813                         r = -EFAULT;
 814                         break;
 815                 }
 816
 817                 if (cinfo.index >= hid->maxcollection)
 818                         break;
 819                 cinfo.index = array_index_nospec(cinfo.index,
 820                                                  hid->maxcollection);
 821
 822                 cinfo.type = hid->collection[cinfo.index].type;
 823                 cinfo.usage = hid->collection[cinfo.index].usage;
 824                 cinfo.level = hid->collection[cinfo.index].level;
 825
 826                 r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ?
 827                         -EFAULT : 0;
 828                 break;
 829
 830         default:
 831                 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ)
 832                         break;
 833
 834                 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) {
 835                         int len = strlen(hid->name) + 1;
 836                         if (len > _IOC_SIZE(cmd))
 837                                  len = _IOC_SIZE(cmd);
 838                         r = copy_to_user(user_arg, hid->name, len) ?
 839                                 -EFAULT : len;
 840                         break;
 841                 }
 842
 843                 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) {
 844                         int len = strlen(hid->phys) + 1;
 845                         if (len > _IOC_SIZE(cmd))
 846                                 len = _IOC_SIZE(cmd);
 847                         r = copy_to_user(user_arg, hid->phys, len) ?
 848                                 -EFAULT : len;
 849                         break;
 850                 }
 851         }
 852
 853 ret_unlock:
 854         mutex_unlock(&hiddev->existancelock);
 855         return r;
 856 }
 857
 858 #ifdef CONFIG_COMPAT
 859 static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 860 {
 861         return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
 862 }
 863 #endif
 864
 865 static const struct file_operations hiddev_fops = {
 866         .owner =        THIS_MODULE,
 867         .read =         hiddev_read,
 868         .write =        hiddev_write,
 869         .poll =         hiddev_poll,
 870         .open =         hiddev_open,
 871         .release =      hiddev_release,
 872         .unlocked_ioctl =       hiddev_ioctl,
 873         .fasync =       hiddev_fasync,
 874 #ifdef CONFIG_COMPAT
 875         .compat_ioctl   = hiddev_compat_ioctl,
 876 #endif
 877         .llseek         = noop_llseek,
 878 };
 879
 880 static char *hiddev_devnode(struct device *dev, umode_t *mode)
 881 {
 882         return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
 883 }
 884
 885 static struct usb_class_driver hiddev_class = {
 886         .name =         "hiddev%d",
 887         .devnode =      hiddev_devnode,
 888         .fops =         &hiddev_fops,
 889         .minor_base =   HIDDEV_MINOR_BASE,
 890 };
 891
 892 /*
 893  * This is where hid.c calls us to connect a hid device to the hiddev driver
 894  */
 895 int hiddev_connect(struct hid_device *hid, unsigned int force)
 896 {
 897         struct hiddev *hiddev;
 898         struct usbhid_device *usbhid = hid->driver_data;
 899         int retval;
 900
 901         if (!force) {
 902                 unsigned int i;
 903                 for (i = 0; i < hid->maxcollection; i++)
 904                         if (hid->collection[i].type ==
 905                             HID_COLLECTION_APPLICATION &&
 906                             !IS_INPUT_APPLICATION(hid->collection[i].usage))
 907                                 break;
 908
 909                 if (i == hid->maxcollection)
 910                         return -1;
 911         }
 912
 913         if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL)))
 914                 return -1;
 915
 916         init_waitqueue_head(&hiddev->wait);
 917         INIT_LIST_HEAD(&hiddev->list);
 918         spin_lock_init(&hiddev->list_lock);
 919         mutex_init(&hiddev->existancelock);
 920         hid->hiddev = hiddev;
 921         hiddev->hid = hid;
 922         hiddev->exist = 1;
 923         retval = usb_register_dev(usbhid->intf, &hiddev_class);
 924         if (retval) {
 925                 hid_err(hid, "Not able to get a minor for this device\n");
 926                 hid->hiddev = NULL;
 927                 kfree(hiddev);
 928                 return -1;
 929         }
 930
 931         /*
 932          * If HID_QUIRK_NO_INIT_REPORTS is set, make sure we don't initialize
 933          * the reports.
 934          */
 935         hiddev->initialized = hid->quirks & HID_QUIRK_NO_INIT_REPORTS;
 936
 937         hiddev->minor = usbhid->intf->minor;
 938
 939         return 0;
 940 }
 941
 942 /*
 943  * This is where hid.c calls us to disconnect a hiddev device from the
 944  * corresponding hid device (usually because the usb device has disconnected)
 945  */
 946 static struct usb_class_driver hiddev_class;
 947 void hiddev_disconnect(struct hid_device *hid)
 948 {
 949         struct hiddev *hiddev = hid->hiddev;
 950         struct usbhid_device *usbhid = hid->driver_data;
 951
 952         usb_deregister_dev(usbhid->intf, &hiddev_class);
 953
 954         mutex_lock(&hiddev->existancelock);
 955         hiddev->exist = 0;
 956
 957         if (hiddev->open) {
 958                 mutex_unlock(&hiddev->existancelock);
 959                 hid_hw_close(hiddev->hid);
 960                 wake_up_interruptible(&hiddev->wait);
 961         } else {
 962                 mutex_unlock(&hiddev->existancelock);
 963                 kfree(hiddev);
 964         }
 965 }