SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/smp_lock.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 "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      64
  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 static struct hiddev *hiddev_table[HIDDEV_MINORS];
  71
  72 /*
  73  * Find a report, given the report's type and ID.  The ID can be specified
  74  * indirectly by REPORT_ID_FIRST (which returns the first report of the given
  75  * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the
  76  * given type which follows old_id.
  77  */
  78 static struct hid_report *
  79 hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo)
  80 {
  81         unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK;
  82         unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK;
  83         struct hid_report_enum *report_enum;
  84         struct hid_report *report;
  85         struct list_head *list;
  86
  87         if (rinfo->report_type < HID_REPORT_TYPE_MIN ||
  88             rinfo->report_type > HID_REPORT_TYPE_MAX)
  89                 return NULL;
  90
  91         report_enum = hid->report_enum +
  92                 (rinfo->report_type - HID_REPORT_TYPE_MIN);
  93
  94         switch (flags) {
  95         case 0: /* Nothing to do -- report_id is already set correctly */
  96                 break;
  97
  98         case HID_REPORT_ID_FIRST:
  99                 if (list_empty(&report_enum->report_list))
 100                         return NULL;
 101
 102                 list = report_enum->report_list.next;
 103                 report = list_entry(list, struct hid_report, list);
 104                 rinfo->report_id = report->id;
 105                 break;
 106
 107         case HID_REPORT_ID_NEXT:
 108                 report = report_enum->report_id_hash[rid];
 109                 if (!report)
 110                         return NULL;
 111
 112                 list = report->list.next;
 113                 if (list == &report_enum->report_list)
 114                         return NULL;
 115
 116                 report = list_entry(list, struct hid_report, list);
 117                 rinfo->report_id = report->id;
 118                 break;
 119
 120         default:
 121                 return NULL;
 122         }
 123
 124         return report_enum->report_id_hash[rinfo->report_id];
 125 }
 126
 127 /*
 128  * Perform an exhaustive search of the report table for a usage, given its
 129  * type and usage id.
 130  */
 131 static struct hid_field *
 132 hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref)
 133 {
 134         int i, j;
 135         struct hid_report *report;
 136         struct hid_report_enum *report_enum;
 137         struct hid_field *field;
 138
 139         if (uref->report_type < HID_REPORT_TYPE_MIN ||
 140             uref->report_type > HID_REPORT_TYPE_MAX)
 141                 return NULL;
 142
 143         report_enum = hid->report_enum +
 144                 (uref->report_type - HID_REPORT_TYPE_MIN);
 145
 146         list_for_each_entry(report, &report_enum->report_list, list) {
 147                 for (i = 0; i < report->maxfield; i++) {
 148                         field = report->field[i];
 149                         for (j = 0; j < field->maxusage; j++) {
 150                                 if (field->usage[j].hid == uref->usage_code) {
 151                                         uref->report_id = report->id;
 152                                         uref->field_index = i;
 153                                         uref->usage_index = j;
 154                                         return field;
 155                                 }
 156                         }
 157                 }
 158         }
 159
 160         return NULL;
 161 }
 162
 163 static void hiddev_send_event(struct hid_device *hid,
 164                               struct hiddev_usage_ref *uref)
 165 {
 166         struct hiddev *hiddev = hid->hiddev;
 167         struct hiddev_list *list;
 168         unsigned long flags;
 169
 170         spin_lock_irqsave(&hiddev->list_lock, flags);
 171         list_for_each_entry(list, &hiddev->list, node) {
 172                 if (uref->field_index != HID_FIELD_INDEX_NONE ||
 173                     (list->flags & HIDDEV_FLAG_REPORT) != 0) {
 174                         list->buffer[list->head] = *uref;
 175                         list->head = (list->head + 1) &
 176                                 (HIDDEV_BUFFER_SIZE - 1);
 177                         kill_fasync(&list->fasync, SIGIO, POLL_IN);
 178                 }
 179         }
 180         spin_unlock_irqrestore(&hiddev->list_lock, flags);
 181
 182         wake_up_interruptible(&hiddev->wait);
 183 }
 184
 185 /*
 186  * This is where hid.c calls into hiddev to pass an event that occurred over
 187  * the interrupt pipe
 188  */
 189 void hiddev_hid_event(struct hid_device *hid, struct hid_field *field,
 190                       struct hid_usage *usage, __s32 value)
 191 {
 192         unsigned type = field->report_type;
 193         struct hiddev_usage_ref uref;
 194
 195         uref.report_type =
 196           (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
 197           ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
 198            ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
 199         uref.report_id = field->report->id;
 200         uref.field_index = field->index;
 201         uref.usage_index = (usage - field->usage);
 202         uref.usage_code = usage->hid;
 203         uref.value = value;
 204
 205         hiddev_send_event(hid, &uref);
 206 }
 207 EXPORT_SYMBOL_GPL(hiddev_hid_event);
 208
 209 void hiddev_report_event(struct hid_device *hid, struct hid_report *report)
 210 {
 211         unsigned type = report->type;
 212         struct hiddev_usage_ref uref;
 213
 214         memset(&uref, 0, sizeof(uref));
 215         uref.report_type =
 216           (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
 217           ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
 218            ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
 219         uref.report_id = report->id;
 220         uref.field_index = HID_FIELD_INDEX_NONE;
 221
 222         hiddev_send_event(hid, &uref);
 223 }
 224
 225 /*
 226  * fasync file op
 227  */
 228 static int hiddev_fasync(int fd, struct file *file, int on)
 229 {
 230         struct hiddev_list *list = file->private_data;
 231
 232         return fasync_helper(fd, file, on, &list->fasync);
 233 }
 234
 235
 236 /*
 237  * release file op
 238  */
 239 static int hiddev_release(struct inode * inode, struct file * file)
 240 {
 241         struct hiddev_list *list = file->private_data;
 242         unsigned long flags;
 243
 244         spin_lock_irqsave(&list->hiddev->list_lock, flags);
 245         list_del(&list->node);
 246         spin_unlock_irqrestore(&list->hiddev->list_lock, flags);
 247
 248         if (!--list->hiddev->open) {
 249                 if (list->hiddev->exist)
 250                         usbhid_close(list->hiddev->hid);
 251                 else
 252                         kfree(list->hiddev);
 253         }
 254
 255         kfree(list);
 256
 257         return 0;
 258 }
 259
 260 /*
 261  * open file op
 262  */
 263 static int hiddev_open(struct inode *inode, struct file *file)
 264 {
 265         struct hiddev_list *list;
 266         int res;
 267
 268         int i = iminor(inode) - HIDDEV_MINOR_BASE;
 269
 270         if (i >= HIDDEV_MINORS || i < 0 || !hiddev_table[i])
 271                 return -ENODEV;
 272
 273         if (!(list = kzalloc(sizeof(struct hiddev_list), GFP_KERNEL)))
 274                 return -ENOMEM;
 275         mutex_init(&list->thread_lock);
 276
 277         list->hiddev = hiddev_table[i];
 278
 279
 280         file->private_data = list;
 281
 282         /*
 283          * no need for locking because the USB major number
 284          * is shared which usbcore guards against disconnect
 285          */
 286         if (list->hiddev->exist) {
 287                 if (!list->hiddev->open++) {
 288                         res = usbhid_open(hiddev_table[i]->hid);
 289                         if (res < 0) {
 290                                 res = -EIO;
 291                                 goto bail;
 292                         }
 293                 }
 294         } else {
 295                 res = -ENODEV;
 296                 goto bail;
 297         }
 298
 299         spin_lock_irq(&list->hiddev->list_lock);
 300         list_add_tail(&list->node, &hiddev_table[i]->list);
 301         spin_unlock_irq(&list->hiddev->list_lock);
 302
 303         return 0;
 304 bail:
 305         file->private_data = NULL;
 306         kfree(list);
 307         return res;
 308 }
 309
 310 /*
 311  * "write" file op
 312  */
 313 static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
 314 {
 315         return -EINVAL;
 316 }
 317
 318 /*
 319  * "read" file op
 320  */
 321 static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
 322 {
 323         DEFINE_WAIT(wait);
 324         struct hiddev_list *list = file->private_data;
 325         int event_size;
 326         int retval;
 327
 328         event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ?
 329                 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event);
 330
 331         if (count < event_size)
 332                 return 0;
 333
 334         /* lock against other threads */
 335         retval = mutex_lock_interruptible(&list->thread_lock);
 336         if (retval)
 337                 return -ERESTARTSYS;
 338
 339         while (retval == 0) {
 340                 if (list->head == list->tail) {
 341                         prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE);
 342
 343                         while (list->head == list->tail) {
 344                                 if (file->f_flags & O_NONBLOCK) {
 345                                         retval = -EAGAIN;
 346                                         break;
 347                                 }
 348                                 if (signal_pending(current)) {
 349                                         retval = -ERESTARTSYS;
 350                                         break;
 351                                 }
 352                                 if (!list->hiddev->exist) {
 353                                         retval = -EIO;
 354                                         break;
 355                                 }
 356
 357                                 /* let O_NONBLOCK tasks run */
 358                                 mutex_unlock(&list->thread_lock);
 359                                 schedule();
 360                                 if (mutex_lock_interruptible(&list->thread_lock))
 361                                         return -EINTR;
 362                                 set_current_state(TASK_INTERRUPTIBLE);
 363                         }
 364                         finish_wait(&list->hiddev->wait, &wait);
 365
 366                 }
 367
 368                 if (retval) {
 369                         mutex_unlock(&list->thread_lock);
 370                         return retval;
 371                 }
 372
 373
 374                 while (list->head != list->tail &&
 375                        retval + event_size <= count) {
 376                         if ((list->flags & HIDDEV_FLAG_UREF) == 0) {
 377                                 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) {
 378                                         struct hiddev_event event;
 379
 380                                         event.hid = list->buffer[list->tail].usage_code;
 381                                         event.value = list->buffer[list->tail].value;
 382                                         if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) {
 383                                                 mutex_unlock(&list->thread_lock);
 384                                                 return -EFAULT;
 385                                         }
 386                                         retval += sizeof(struct hiddev_event);
 387                                 }
 388                         } else {
 389                                 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE ||
 390                                     (list->flags & HIDDEV_FLAG_REPORT) != 0) {
 391
 392                                         if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) {
 393                                                 mutex_unlock(&list->thread_lock);
 394                                                 return -EFAULT;
 395                                         }
 396                                         retval += sizeof(struct hiddev_usage_ref);
 397                                 }
 398                         }
 399                         list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1);
 400                 }
 401
 402         }
 403         mutex_unlock(&list->thread_lock);
 404
 405         return retval;
 406 }
 407
 408 /*
 409  * "poll" file op
 410  * No kernel lock - fine
 411  */
 412 static unsigned int hiddev_poll(struct file *file, poll_table *wait)
 413 {
 414         struct hiddev_list *list = file->private_data;
 415
 416         poll_wait(file, &list->hiddev->wait, wait);
 417         if (list->head != list->tail)
 418                 return POLLIN | POLLRDNORM;
 419         if (!list->hiddev->exist)
 420                 return POLLERR | POLLHUP;
 421         return 0;
 422 }
 423
 424 /*
 425  * "ioctl" file op
 426  */
 427 static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
 428 {
 429         struct hid_device *hid = hiddev->hid;
 430         struct hiddev_report_info rinfo;
 431         struct hiddev_usage_ref_multi *uref_multi = NULL;
 432         struct hiddev_usage_ref *uref;
 433         struct hid_report *report;
 434         struct hid_field *field;
 435         int i;
 436
 437         uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL);
 438         if (!uref_multi)
 439                 return -ENOMEM;
 440         lock_kernel();
 441         uref = &uref_multi->uref;
 442         if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
 443                 if (copy_from_user(uref_multi, user_arg,
 444                                    sizeof(*uref_multi)))
 445                         goto fault;
 446         } else {
 447                 if (copy_from_user(uref, user_arg, sizeof(*uref)))
 448                         goto fault;
 449         }
 450
 451         switch (cmd) {
 452         case HIDIOCGUCODE:
 453                 rinfo.report_type = uref->report_type;
 454                 rinfo.report_id = uref->report_id;
 455                 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
 456                         goto inval;
 457
 458                 if (uref->field_index >= report->maxfield)
 459                         goto inval;
 460
 461                 field = report->field[uref->field_index];
 462                 if (uref->usage_index >= field->maxusage)
 463                         goto inval;
 464
 465                 uref->usage_code = field->usage[uref->usage_index].hid;
 466
 467                 if (copy_to_user(user_arg, uref, sizeof(*uref)))
 468                         goto fault;
 469
 470                 goto goodreturn;
 471
 472         default:
 473                 if (cmd != HIDIOCGUSAGE &&
 474                     cmd != HIDIOCGUSAGES &&
 475                     uref->report_type == HID_REPORT_TYPE_INPUT)
 476                         goto inval;
 477
 478                 if (uref->report_id == HID_REPORT_ID_UNKNOWN) {
 479                         field = hiddev_lookup_usage(hid, uref);
 480                         if (field == NULL)
 481                                 goto inval;
 482                 } else {
 483                         rinfo.report_type = uref->report_type;
 484                         rinfo.report_id = uref->report_id;
 485                         if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
 486                                 goto inval;
 487
 488                         if (uref->field_index >= report->maxfield)
 489                                 goto inval;
 490
 491                         field = report->field[uref->field_index];
 492
 493                         if (cmd == HIDIOCGCOLLECTIONINDEX) {
 494                                 if (uref->usage_index >= field->maxusage)
 495                                         goto inval;
 496                         } else if (uref->usage_index >= field->report_count)
 497                                 goto inval;
 498
 499                         else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) &&
 500                                  (uref_multi->num_values > HID_MAX_MULTI_USAGES ||
 501                                   uref->usage_index + uref_multi->num_values > field->report_count))
 502                                 goto inval;
 503                         }
 504
 505                 switch (cmd) {
 506                 case HIDIOCGUSAGE:
 507                         uref->value = field->value[uref->usage_index];
 508                         if (copy_to_user(user_arg, uref, sizeof(*uref)))
 509                                 goto fault;
 510                         goto goodreturn;
 511
 512                 case HIDIOCSUSAGE:
 513                         field->value[uref->usage_index] = uref->value;
 514                         goto goodreturn;
 515
 516                 case HIDIOCGCOLLECTIONINDEX:
 517                         kfree(uref_multi);
 518                         return field->usage[uref->usage_index].collection_index;
 519                 case HIDIOCGUSAGES:
 520                         for (i = 0; i < uref_multi->num_values; i++)
 521                                 uref_multi->values[i] =
 522                                     field->value[uref->usage_index + i];
 523                         if (copy_to_user(user_arg, uref_multi,
 524                                          sizeof(*uref_multi)))
 525                                 goto fault;
 526                         goto goodreturn;
 527                 case HIDIOCSUSAGES:
 528                         for (i = 0; i < uref_multi->num_values; i++)
 529                                 field->value[uref->usage_index + i] =
 530                                     uref_multi->values[i];
 531                         goto goodreturn;
 532                 }
 533
 534 goodreturn:
 535                 unlock_kernel();
 536                 kfree(uref_multi);
 537                 return 0;
 538 fault:
 539                 unlock_kernel();
 540                 kfree(uref_multi);
 541                 return -EFAULT;
 542 inval:
 543                 unlock_kernel();
 544                 kfree(uref_multi);
 545                 return -EINVAL;
 546         }
 547 }
 548
 549 static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
 550 {
 551         struct hid_device *hid = hiddev->hid;
 552         struct usb_device *dev = hid_to_usb_dev(hid);
 553         int idx, len;
 554         char *buf;
 555
 556         if (get_user(idx, (int __user *)user_arg))
 557                 return -EFAULT;
 558
 559         if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL)
 560                 return -ENOMEM;
 561
 562         if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) {
 563                 kfree(buf);
 564                 return -EINVAL;
 565         }
 566
 567         if (copy_to_user(user_arg+sizeof(int), buf, len+1)) {
 568                 kfree(buf);
 569                 return -EFAULT;
 570         }
 571
 572         kfree(buf);
 573
 574         return len;
 575 }
 576
 577 static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 578 {
 579         struct hiddev_list *list = file->private_data;
 580         struct hiddev *hiddev = list->hiddev;
 581         struct hid_device *hid = hiddev->hid;
 582         struct usb_device *dev = hid_to_usb_dev(hid);
 583         struct hiddev_collection_info cinfo;
 584         struct hiddev_report_info rinfo;
 585         struct hiddev_field_info finfo;
 586         struct hiddev_devinfo dinfo;
 587         struct hid_report *report;
 588         struct hid_field *field;
 589         struct usbhid_device *usbhid = hid->driver_data;
 590         void __user *user_arg = (void __user *)arg;
 591         int i, r;
 592
 593         /* Called without BKL by compat methods so no BKL taken */
 594
 595         /* FIXME: Who or what stop this racing with a disconnect ?? */
 596         if (!hiddev->exist)
 597                 return -EIO;
 598
 599         switch (cmd) {
 600
 601         case HIDIOCGVERSION:
 602                 return put_user(HID_VERSION, (int __user *)arg);
 603
 604         case HIDIOCAPPLICATION:
 605                 if (arg < 0 || arg >= hid->maxapplication)
 606                         return -EINVAL;
 607
 608                 for (i = 0; i < hid->maxcollection; i++)
 609                         if (hid->collection[i].type ==
 610                             HID_COLLECTION_APPLICATION && arg-- == 0)
 611                                 break;
 612
 613                 if (i == hid->maxcollection)
 614                         return -EINVAL;
 615
 616                 return hid->collection[i].usage;
 617
 618         case HIDIOCGDEVINFO:
 619                 dinfo.bustype = BUS_USB;
 620                 dinfo.busnum = dev->bus->busnum;
 621                 dinfo.devnum = dev->devnum;
 622                 dinfo.ifnum = usbhid->ifnum;
 623                 dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor);
 624                 dinfo.product = le16_to_cpu(dev->descriptor.idProduct);
 625                 dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice);
 626                 dinfo.num_applications = hid->maxapplication;
 627                 if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
 628                         return -EFAULT;
 629
 630                 return 0;
 631
 632         case HIDIOCGFLAG:
 633                 if (put_user(list->flags, (int __user *)arg))
 634                         return -EFAULT;
 635
 636                 return 0;
 637
 638         case HIDIOCSFLAG:
 639                 {
 640                         int newflags;
 641                         if (get_user(newflags, (int __user *)arg))
 642                                 return -EFAULT;
 643
 644                         if ((newflags & ~HIDDEV_FLAGS) != 0 ||
 645                             ((newflags & HIDDEV_FLAG_REPORT) != 0 &&
 646                              (newflags & HIDDEV_FLAG_UREF) == 0))
 647                                 return -EINVAL;
 648
 649                         list->flags = newflags;
 650
 651                         return 0;
 652                 }
 653
 654         case HIDIOCGSTRING:
 655                 mutex_lock(&hiddev->existancelock);
 656                 if (hiddev->exist)
 657                         r = hiddev_ioctl_string(hiddev, cmd, user_arg);
 658                 else
 659                         r = -ENODEV;
 660                 mutex_unlock(&hiddev->existancelock);
 661                 return r;
 662
 663         case HIDIOCINITREPORT:
 664                 mutex_lock(&hiddev->existancelock);
 665                 if (!hiddev->exist) {
 666                         mutex_unlock(&hiddev->existancelock);
 667                         return -ENODEV;
 668                 }
 669                 usbhid_init_reports(hid);
 670                 mutex_unlock(&hiddev->existancelock);
 671
 672                 return 0;
 673
 674         case HIDIOCGREPORT:
 675                 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo)))
 676                         return -EFAULT;
 677
 678                 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT)
 679                         return -EINVAL;
 680
 681                 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
 682                         return -EINVAL;
 683
 684                 mutex_lock(&hiddev->existancelock);
 685                 if (hiddev->exist) {
 686                         usbhid_submit_report(hid, report, USB_DIR_IN);
 687                         usbhid_wait_io(hid);
 688                 }
 689                 mutex_unlock(&hiddev->existancelock);
 690
 691                 return 0;
 692
 693         case HIDIOCSREPORT:
 694                 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo)))
 695                         return -EFAULT;
 696
 697                 if (rinfo.report_type == HID_REPORT_TYPE_INPUT)
 698                         return -EINVAL;
 699
 700                 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
 701                         return -EINVAL;
 702
 703                 mutex_lock(&hiddev->existancelock);
 704                 if (hiddev->exist) {
 705                         usbhid_submit_report(hid, report, USB_DIR_OUT);
 706                         usbhid_wait_io(hid);
 707                 }
 708                 mutex_unlock(&hiddev->existancelock);
 709
 710                 return 0;
 711
 712         case HIDIOCGREPORTINFO:
 713                 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo)))
 714                         return -EFAULT;
 715
 716                 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
 717                         return -EINVAL;
 718
 719                 rinfo.num_fields = report->maxfield;
 720
 721                 if (copy_to_user(user_arg, &rinfo, sizeof(rinfo)))
 722                         return -EFAULT;
 723
 724                 return 0;
 725
 726         case HIDIOCGFIELDINFO:
 727                 if (copy_from_user(&finfo, user_arg, sizeof(finfo)))
 728                         return -EFAULT;
 729                 rinfo.report_type = finfo.report_type;
 730                 rinfo.report_id = finfo.report_id;
 731                 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
 732                         return -EINVAL;
 733
 734                 if (finfo.field_index >= report->maxfield)
 735                         return -EINVAL;
 736
 737                 field = report->field[finfo.field_index];
 738                 memset(&finfo, 0, sizeof(finfo));
 739                 finfo.report_type = rinfo.report_type;
 740                 finfo.report_id = rinfo.report_id;
 741                 finfo.field_index = field->report_count - 1;
 742                 finfo.maxusage = field->maxusage;
 743                 finfo.flags = field->flags;
 744                 finfo.physical = field->physical;
 745                 finfo.logical = field->logical;
 746                 finfo.application = field->application;
 747                 finfo.logical_minimum = field->logical_minimum;
 748                 finfo.logical_maximum = field->logical_maximum;
 749                 finfo.physical_minimum = field->physical_minimum;
 750                 finfo.physical_maximum = field->physical_maximum;
 751                 finfo.unit_exponent = field->unit_exponent;
 752                 finfo.unit = field->unit;
 753
 754                 if (copy_to_user(user_arg, &finfo, sizeof(finfo)))
 755                         return -EFAULT;
 756
 757                 return 0;
 758
 759         case HIDIOCGUCODE:
 760                 /* fall through */
 761         case HIDIOCGUSAGE:
 762         case HIDIOCSUSAGE:
 763         case HIDIOCGUSAGES:
 764         case HIDIOCSUSAGES:
 765         case HIDIOCGCOLLECTIONINDEX:
 766                 mutex_lock(&hiddev->existancelock);
 767                 if (hiddev->exist)
 768                         r = hiddev_ioctl_usage(hiddev, cmd, user_arg);
 769                 else
 770                         r = -ENODEV;
 771                 mutex_unlock(&hiddev->existancelock);
 772                 return r;
 773
 774         case HIDIOCGCOLLECTIONINFO:
 775                 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo)))
 776                         return -EFAULT;
 777
 778                 if (cinfo.index >= hid->maxcollection)
 779                         return -EINVAL;
 780
 781                 cinfo.type = hid->collection[cinfo.index].type;
 782                 cinfo.usage = hid->collection[cinfo.index].usage;
 783                 cinfo.level = hid->collection[cinfo.index].level;
 784
 785                 if (copy_to_user(user_arg, &cinfo, sizeof(cinfo)))
 786                         return -EFAULT;
 787                 return 0;
 788
 789         default:
 790
 791                 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ)
 792                         return -EINVAL;
 793
 794                 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) {
 795                         int len;
 796                         if (!hid->name)
 797                                 return 0;
 798                         len = strlen(hid->name) + 1;
 799                         if (len > _IOC_SIZE(cmd))
 800                                  len = _IOC_SIZE(cmd);
 801                         return copy_to_user(user_arg, hid->name, len) ?
 802                                 -EFAULT : len;
 803                 }
 804
 805                 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) {
 806                         int len;
 807                         if (!hid->phys)
 808                                 return 0;
 809                         len = strlen(hid->phys) + 1;
 810                         if (len > _IOC_SIZE(cmd))
 811                                 len = _IOC_SIZE(cmd);
 812                         return copy_to_user(user_arg, hid->phys, len) ?
 813                                 -EFAULT : len;
 814                 }
 815         }
 816         return -EINVAL;
 817 }
 818
 819 #ifdef CONFIG_COMPAT
 820 static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 821 {
 822         return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
 823 }
 824 #endif
 825
 826 static const struct file_operations hiddev_fops = {
 827         .owner =        THIS_MODULE,
 828         .read =         hiddev_read,
 829         .write =        hiddev_write,
 830         .poll =         hiddev_poll,
 831         .open =         hiddev_open,
 832         .release =      hiddev_release,
 833         .unlocked_ioctl =       hiddev_ioctl,
 834         .fasync =       hiddev_fasync,
 835 #ifdef CONFIG_COMPAT
 836         .compat_ioctl   = hiddev_compat_ioctl,
 837 #endif
 838 };
 839
 840 static struct usb_class_driver hiddev_class = {
 841         .name =         "hiddev%d",
 842         .fops =         &hiddev_fops,
 843         .minor_base =   HIDDEV_MINOR_BASE,
 844 };
 845
 846 /*
 847  * This is where hid.c calls us to connect a hid device to the hiddev driver
 848  */
 849 int hiddev_connect(struct hid_device *hid, unsigned int force)
 850 {
 851         struct hiddev *hiddev;
 852         struct usbhid_device *usbhid = hid->driver_data;
 853         int retval;
 854
 855         if (!force) {
 856                 unsigned int i;
 857                 for (i = 0; i < hid->maxcollection; i++)
 858                         if (hid->collection[i].type ==
 859                             HID_COLLECTION_APPLICATION &&
 860                             !IS_INPUT_APPLICATION(hid->collection[i].usage))
 861                                 break;
 862
 863                 if (i == hid->maxcollection)
 864                         return -1;
 865         }
 866
 867         if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL)))
 868                 return -1;
 869
 870         init_waitqueue_head(&hiddev->wait);
 871         INIT_LIST_HEAD(&hiddev->list);
 872         spin_lock_init(&hiddev->list_lock);
 873         mutex_init(&hiddev->existancelock);
 874         hid->hiddev = hiddev;
 875         hiddev->hid = hid;
 876         hiddev->exist = 1;
 877
 878         retval = usb_register_dev(usbhid->intf, &hiddev_class);
 879         if (retval) {
 880                 err_hid("Not able to get a minor for this device.");
 881                 hid->hiddev = NULL;
 882                 kfree(hiddev);
 883                 return -1;
 884         } else {
 885                 hid->minor = usbhid->intf->minor;
 886                 hiddev_table[usbhid->intf->minor - HIDDEV_MINOR_BASE] = hiddev;
 887         }
 888
 889         return 0;
 890 }
 891
 892 /*
 893  * This is where hid.c calls us to disconnect a hiddev device from the
 894  * corresponding hid device (usually because the usb device has disconnected)
 895  */
 896 static struct usb_class_driver hiddev_class;
 897 void hiddev_disconnect(struct hid_device *hid)
 898 {
 899         struct hiddev *hiddev = hid->hiddev;
 900         struct usbhid_device *usbhid = hid->driver_data;
 901
 902         mutex_lock(&hiddev->existancelock);
 903         hiddev->exist = 0;
 904         mutex_unlock(&hiddev->existancelock);
 905
 906         hiddev_table[hiddev->hid->minor - HIDDEV_MINOR_BASE] = NULL;
 907         usb_deregister_dev(usbhid->intf, &hiddev_class);
 908
 909         if (hiddev->open) {
 910                 usbhid_close(hiddev->hid);
 911                 wake_up_interruptible(&hiddev->wait);
 912         } else {
 913                 kfree(hiddev);
 914         }
 915 }
 916
 917 /* Currently this driver is a USB driver.  It's not a conventional one in
 918  * the sense that it doesn't probe at the USB level.  Instead it waits to
 919  * be connected by HID through the hiddev_connect / hiddev_disconnect
 920  * routines.  The reason to register as a USB device is to gain part of the
 921  * minor number space from the USB major.
 922  *
 923  * In theory, should the HID code be generalized to more than one physical
 924  * medium (say, IEEE 1384), this driver will probably need to register its
 925  * own major number, and in doing so, no longer need to register with USB.
 926  * At that point the probe routine and hiddev_driver struct below will no
 927  * longer be useful.
 928  */
 929
 930
 931 /* We never attach in this manner, and rely on HID to connect us.  This
 932  * is why there is no disconnect routine defined in the usb_driver either.
 933  */
 934 static int hiddev_usbd_probe(struct usb_interface *intf,
 935                              const struct usb_device_id *hiddev_info)
 936 {
 937         return -ENODEV;
 938 }
 939
 940
 941 static /* const */ struct usb_driver hiddev_driver = {
 942         .name =         "hiddev",
 943         .probe =        hiddev_usbd_probe,
 944 };
 945
 946 int __init hiddev_init(void)
 947 {
 948         return usb_register(&hiddev_driver);
 949 }
 950
 951 void hiddev_exit(void)
 952 {
 953         usb_deregister(&hiddev_driver);
 954 }