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