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