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