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