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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 | /* * Copyright (c) 2001 Paul Stewart * Copyright (c) 2001 Vojtech Pavlik * * HID char devices, giving access to raw HID device events. * */ /* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Should you need to contact me, the author, you can do so either by * e-mail - mail your message to Paul Stewart <stewart@wetlogic.net> */ #include <linux/config.h> #include <linux/poll.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/init.h> #include <linux/smp_lock.h> #include <linux/input.h> #include <linux/usb.h> #include "hid.h" #include <linux/hiddev.h> #include <linux/devfs_fs_kernel.h> #ifdef CONFIG_USB_DYNAMIC_MINORS #define HIDDEV_MINOR_BASE 0 #define HIDDEV_MINORS 256 #else #define HIDDEV_MINOR_BASE 96 #define HIDDEV_MINORS 16 #endif #define HIDDEV_BUFFER_SIZE 64 struct hiddev { int exist; int open; wait_queue_head_t wait; struct hid_device *hid; struct hiddev_list *list; }; struct hiddev_list { struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE]; int head; int tail; unsigned flags; struct fasync_struct *fasync; struct hiddev *hiddev; struct hiddev_list *next; }; static struct hiddev *hiddev_table[HIDDEV_MINORS]; /* * Find a report, given the report's type and ID. The ID can be specified * indirectly by REPORT_ID_FIRST (which returns the first report of the given * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the * given type which follows old_id. */ static struct hid_report * hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo) { unsigned flags = rinfo->report_id & ~HID_REPORT_ID_MASK; struct hid_report_enum *report_enum; struct list_head *list; if (rinfo->report_type < HID_REPORT_TYPE_MIN || rinfo->report_type > HID_REPORT_TYPE_MAX) return NULL; report_enum = hid->report_enum + (rinfo->report_type - HID_REPORT_TYPE_MIN); switch (flags) { case 0: /* Nothing to do -- report_id is already set correctly */ break; case HID_REPORT_ID_FIRST: list = report_enum->report_list.next; if (list == &report_enum->report_list) return NULL; rinfo->report_id = ((struct hid_report *) list)->id; break; case HID_REPORT_ID_NEXT: list = (struct list_head *) report_enum->report_id_hash[rinfo->report_id & HID_REPORT_ID_MASK]; if (list == NULL) return NULL; list = list->next; if (list == &report_enum->report_list) return NULL; rinfo->report_id = ((struct hid_report *) list)->id; break; default: return NULL; } return report_enum->report_id_hash[rinfo->report_id]; } /* * Perform an exhaustive search of the report table for a usage, given its * type and usage id. */ static struct hid_field * hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref) { int i, j; struct hid_report *report; struct hid_report_enum *report_enum; struct list_head *list; struct hid_field *field; if (uref->report_type < HID_REPORT_TYPE_MIN || uref->report_type > HID_REPORT_TYPE_MAX) return NULL; report_enum = hid->report_enum + (uref->report_type - HID_REPORT_TYPE_MIN); list = report_enum->report_list.next; while (list != &report_enum->report_list) { report = (struct hid_report *) list; for (i = 0; i < report->maxfield; i++) { field = report->field[i]; for (j = 0; j < field->maxusage; j++) { if (field->usage[j].hid == uref->usage_code) { uref->report_id = report->id; uref->field_index = i; uref->usage_index = j; return field; } } } list = list->next; } return NULL; } static void hiddev_send_event(struct hid_device *hid, struct hiddev_usage_ref *uref) { struct hiddev *hiddev = hid->hiddev; struct hiddev_list *list = hiddev->list; while (list) { if (uref->field_index != HID_FIELD_INDEX_NONE || (list->flags & HIDDEV_FLAG_REPORT) != 0) { list->buffer[list->head] = *uref; list->head = (list->head + 1) & (HIDDEV_BUFFER_SIZE - 1); kill_fasync(&list->fasync, SIGIO, POLL_IN); } list = list->next; } wake_up_interruptible(&hiddev->wait); } /* * This is where hid.c calls into hiddev to pass an event that occurred over * the interrupt pipe */ void hiddev_hid_event(struct hid_device *hid, struct hid_field *field, struct hid_usage *usage, __s32 value, struct pt_regs *regs) { unsigned type = field->report_type; struct hiddev_usage_ref uref; uref.report_type = (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE:0)); uref.report_id = field->report->id; uref.field_index = field->index; uref.usage_index = (usage - field->usage); uref.usage_code = usage->hid; uref.value = value; hiddev_send_event(hid, &uref); } void hiddev_report_event(struct hid_device *hid, struct hid_report *report) { unsigned type = report->type; struct hiddev_usage_ref uref; memset(&uref, 0, sizeof(uref)); uref.report_type = (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE:0)); uref.report_id = report->id; uref.field_index = HID_FIELD_INDEX_NONE; hiddev_send_event(hid, &uref); } /* * fasync file op */ static int hiddev_fasync(int fd, struct file *file, int on) { int retval; struct hiddev_list *list = file->private_data; retval = fasync_helper(fd, file, on, &list->fasync); return retval < 0 ? retval : 0; } /* * release file op */ static int hiddev_release(struct inode * inode, struct file * file) { struct hiddev_list *list = file->private_data; struct hiddev_list **listptr; listptr = &list->hiddev->list; hiddev_fasync(-1, file, 0); while (*listptr && (*listptr != list)) listptr = &((*listptr)->next); *listptr = (*listptr)->next; if (!--list->hiddev->open) { if (list->hiddev->exist) hid_close(list->hiddev->hid); else kfree(list->hiddev); } kfree(list); return 0; } /* * open file op */ static int hiddev_open(struct inode * inode, struct file * file) { struct hiddev_list *list; int i = iminor(inode) - HIDDEV_MINOR_BASE; if (i >= HIDDEV_MINORS || !hiddev_table[i]) return -ENODEV; if (!(list = kmalloc(sizeof(struct hiddev_list), GFP_KERNEL))) return -ENOMEM; memset(list, 0, sizeof(struct hiddev_list)); list->hiddev = hiddev_table[i]; list->next = hiddev_table[i]->list; hiddev_table[i]->list = list; file->private_data = list; if (!list->hiddev->open++) if (list->hiddev->exist) hid_open(hiddev_table[i]->hid); return 0; } /* * "write" file op */ static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) { return -EINVAL; } /* * "read" file op */ static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) { DECLARE_WAITQUEUE(wait, current); struct hiddev_list *list = file->private_data; int event_size; int retval = 0; event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); if (count < event_size) return 0; while (retval == 0) { if (list->head == list->tail) { add_wait_queue(&list->hiddev->wait, &wait); set_current_state(TASK_INTERRUPTIBLE); while (list->head == list->tail) { if (file->f_flags & O_NONBLOCK) { retval = -EAGAIN; break; } if (signal_pending(current)) { retval = -ERESTARTSYS; break; } if (!list->hiddev->exist) { retval = -EIO; break; } schedule(); } set_current_state(TASK_RUNNING); remove_wait_queue(&list->hiddev->wait, &wait); } if (retval) return retval; while (list->head != list->tail && retval + event_size <= count) { if ((list->flags & HIDDEV_FLAG_UREF) == 0) { if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) { struct hiddev_event event; event.hid = list->buffer[list->tail].usage_code; event.value = list->buffer[list->tail].value; if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) return -EFAULT; retval += sizeof(struct hiddev_event); } } else { if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE || (list->flags & HIDDEV_FLAG_REPORT) != 0) { if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) return -EFAULT; retval += sizeof(struct hiddev_usage_ref); } } list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); } } return retval; } /* * "poll" file op * No kernel lock - fine */ static unsigned int hiddev_poll(struct file *file, poll_table *wait) { struct hiddev_list *list = file->private_data; poll_wait(file, &list->hiddev->wait, wait); if (list->head != list->tail) return POLLIN | POLLRDNORM; if (!list->hiddev->exist) return POLLERR | POLLHUP; return 0; } /* * "ioctl" file op */ static int hiddev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { struct hiddev_list *list = file->private_data; struct hiddev *hiddev = list->hiddev; struct hid_device *hid = hiddev->hid; struct usb_device *dev = hid->dev; struct hiddev_collection_info cinfo; struct hiddev_report_info rinfo; struct hiddev_field_info finfo; struct hiddev_usage_ref_multi *uref_multi=NULL; struct hiddev_usage_ref *uref; struct hiddev_devinfo dinfo; struct hid_report *report; struct hid_field *field; void __user *user_arg = (void __user *)arg; int i; if (!hiddev->exist) return -EIO; switch (cmd) { case HIDIOCGVERSION: return put_user(HID_VERSION, (int __user *)arg); case HIDIOCAPPLICATION: if (arg < 0 || arg >= hid->maxapplication) return -EINVAL; for (i = 0; i < hid->maxcollection; i++) if (hid->collection[i].type == HID_COLLECTION_APPLICATION && arg-- == 0) break; if (i == hid->maxcollection) return -EINVAL; return hid->collection[i].usage; case HIDIOCGDEVINFO: dinfo.bustype = BUS_USB; dinfo.busnum = dev->bus->busnum; dinfo.devnum = dev->devnum; dinfo.ifnum = hid->ifnum; dinfo.vendor = dev->descriptor.idVendor; dinfo.product = dev->descriptor.idProduct; dinfo.version = dev->descriptor.bcdDevice; dinfo.num_applications = hid->maxapplication; if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) return -EFAULT; return 0; case HIDIOCGFLAG: if (put_user(list->flags, (int __user *)arg)) return -EFAULT; return 0; case HIDIOCSFLAG: { int newflags; if (get_user(newflags, (int __user *)arg)) return -EFAULT; if ((newflags & ~HIDDEV_FLAGS) != 0 || ((newflags & HIDDEV_FLAG_REPORT) != 0 && (newflags & HIDDEV_FLAG_UREF) == 0)) return -EINVAL; list->flags = newflags; return 0; } case HIDIOCGSTRING: { int idx, len; char *buf; if (get_user(idx, (int __user *)arg)) return -EFAULT; if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) return -ENOMEM; if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) { kfree(buf); return -EINVAL; } if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { kfree(buf); return -EFAULT; } kfree(buf); return len; } case HIDIOCINITREPORT: hid_init_reports(hid); return 0; case HIDIOCGREPORT: if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) return -EFAULT; if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) return -EINVAL; if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) return -EINVAL; hid_submit_report(hid, report, USB_DIR_IN); hid_wait_io(hid); return 0; case HIDIOCSREPORT: if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) return -EFAULT; if (rinfo.report_type == HID_REPORT_TYPE_INPUT) return -EINVAL; if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) return -EINVAL; hid_submit_report(hid, report, USB_DIR_OUT); return 0; case HIDIOCGREPORTINFO: if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) return -EFAULT; if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) return -EINVAL; rinfo.num_fields = report->maxfield; if (copy_to_user(user_arg, &rinfo, sizeof(rinfo))) return -EFAULT; return 0; case HIDIOCGFIELDINFO: if (copy_from_user(&finfo, user_arg, sizeof(finfo))) return -EFAULT; rinfo.report_type = finfo.report_type; rinfo.report_id = finfo.report_id; if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) return -EINVAL; if (finfo.field_index >= report->maxfield) return -EINVAL; field = report->field[finfo.field_index]; memset(&finfo, 0, sizeof(finfo)); finfo.report_type = rinfo.report_type; finfo.report_id = rinfo.report_id; finfo.field_index = field->report_count - 1; finfo.maxusage = field->maxusage; finfo.flags = field->flags; finfo.physical = field->physical; finfo.logical = field->logical; finfo.application = field->application; finfo.logical_minimum = field->logical_minimum; finfo.logical_maximum = field->logical_maximum; finfo.physical_minimum = field->physical_minimum; finfo.physical_maximum = field->physical_maximum; finfo.unit_exponent = field->unit_exponent; finfo.unit = field->unit; if (copy_to_user(user_arg, &finfo, sizeof(finfo))) return -EFAULT; return 0; case HIDIOCGUCODE: uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); if (!uref_multi) return -ENOMEM; uref = &uref_multi->uref; if (copy_from_user(uref, user_arg, sizeof(*uref))) goto fault; rinfo.report_type = uref->report_type; rinfo.report_id = uref->report_id; if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) goto inval; if (uref->field_index >= report->maxfield) goto inval; field = report->field[uref->field_index]; if (uref->usage_index >= field->maxusage) goto inval; uref->usage_code = field->usage[uref->usage_index].hid; if (copy_to_user(user_arg, uref, sizeof(*uref))) goto fault; kfree(uref_multi); return 0; case HIDIOCGUSAGE: case HIDIOCSUSAGE: case HIDIOCGUSAGES: case HIDIOCSUSAGES: case HIDIOCGCOLLECTIONINDEX: uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); if (!uref_multi) return -ENOMEM; uref = &uref_multi->uref; if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { if (copy_from_user(uref_multi, user_arg, sizeof(*uref_multi))) goto fault; } else { if (copy_from_user(uref, user_arg, sizeof(*uref))) goto fault; } if (cmd != HIDIOCGUSAGE && cmd != HIDIOCGUSAGES && uref->report_type == HID_REPORT_TYPE_INPUT) goto inval; if (uref->report_id == HID_REPORT_ID_UNKNOWN) { field = hiddev_lookup_usage(hid, uref); if (field == NULL) goto inval; } else { rinfo.report_type = uref->report_type; rinfo.report_id = uref->report_id; if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) goto inval; if (uref->field_index >= report->maxfield) goto inval; field = report->field[uref->field_index]; if (uref->usage_index >= field->maxusage) goto inval; if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { if (uref_multi->num_values >= HID_MAX_USAGES || uref->usage_index >= field->maxusage || (uref->usage_index + uref_multi->num_values) >= field->maxusage) goto inval; } } switch (cmd) { case HIDIOCGUSAGE: uref->value = field->value[uref->usage_index]; if (copy_to_user(user_arg, uref, sizeof(*uref))) goto fault; goto goodreturn; case HIDIOCSUSAGE: field->value[uref->usage_index] = uref->value; goto goodreturn; case HIDIOCGCOLLECTIONINDEX: kfree(uref_multi); return field->usage[uref->usage_index].collection_index; case HIDIOCGUSAGES: for (i = 0; i < uref_multi->num_values; i++) uref_multi->values[i] = field->value[uref->usage_index + i]; if (copy_to_user(user_arg, uref_multi, sizeof(*uref_multi))) goto fault; goto goodreturn; case HIDIOCSUSAGES: for (i = 0; i < uref_multi->num_values; i++) field->value[uref->usage_index + i] = uref_multi->values[i]; goto goodreturn; } goodreturn: kfree(uref_multi); return 0; fault: kfree(uref_multi); return -EFAULT; inval: kfree(uref_multi); return -EINVAL; case HIDIOCGCOLLECTIONINFO: if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) return -EFAULT; if (cinfo.index >= hid->maxcollection) return -EINVAL; cinfo.type = hid->collection[cinfo.index].type; cinfo.usage = hid->collection[cinfo.index].usage; cinfo.level = hid->collection[cinfo.index].level; if (copy_to_user(user_arg, &cinfo, sizeof(cinfo))) return -EFAULT; return 0; default: if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) return -EINVAL; if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { int len; if (!hid->name) return 0; len = strlen(hid->name) + 1; if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); return copy_to_user(user_arg, hid->name, len) ? -EFAULT : len; } if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { int len; if (!hid->phys) return 0; len = strlen(hid->phys) + 1; if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); return copy_to_user(user_arg, hid->phys, len) ? -EFAULT : len; } } return -EINVAL; } static struct file_operations hiddev_fops = { .owner = THIS_MODULE, .read = hiddev_read, .write = hiddev_write, .poll = hiddev_poll, .open = hiddev_open, .release = hiddev_release, .ioctl = hiddev_ioctl, .fasync = hiddev_fasync, }; static struct usb_class_driver hiddev_class = { .name = "usb/hid/hiddev%d", .fops = &hiddev_fops, .mode = S_IFCHR | S_IRUGO | S_IWUSR, .minor_base = HIDDEV_MINOR_BASE, }; /* * This is where hid.c calls us to connect a hid device to the hiddev driver */ int hiddev_connect(struct hid_device *hid) { struct hiddev *hiddev; int i; int retval; for (i = 0; i < hid->maxcollection; i++) if (hid->collection[i].type == HID_COLLECTION_APPLICATION && !IS_INPUT_APPLICATION(hid->collection[i].usage)) break; if (i == hid->maxcollection && (hid->quirks & HID_QUIRK_HIDDEV) == 0) return -1; if (!(hiddev = kmalloc(sizeof(struct hiddev), GFP_KERNEL))) return -1; memset(hiddev, 0, sizeof(struct hiddev)); retval = usb_register_dev(hid->intf, &hiddev_class); if (retval) { err("Not able to get a minor for this device."); kfree(hiddev); return -1; } init_waitqueue_head(&hiddev->wait); hiddev_table[hid->intf->minor - HIDDEV_MINOR_BASE] = hiddev; hiddev->hid = hid; hiddev->exist = 1; hid->minor = hid->intf->minor; hid->hiddev = hiddev; return 0; } /* * This is where hid.c calls us to disconnect a hiddev device from the * corresponding hid device (usually because the usb device has disconnected) */ static struct usb_class_driver hiddev_class; void hiddev_disconnect(struct hid_device *hid) { struct hiddev *hiddev = hid->hiddev; hiddev->exist = 0; hiddev_table[hiddev->hid->minor - HIDDEV_MINOR_BASE] = NULL; usb_deregister_dev(hiddev->hid->intf, &hiddev_class); if (hiddev->open) { hid_close(hiddev->hid); wake_up_interruptible(&hiddev->wait); } else { kfree(hiddev); } } /* Currently this driver is a USB driver. It's not a conventional one in * the sense that it doesn't probe at the USB level. Instead it waits to * be connected by HID through the hiddev_connect / hiddev_disconnect * routines. The reason to register as a USB device is to gain part of the * minor number space from the USB major. * * In theory, should the HID code be generalized to more than one physical * medium (say, IEEE 1384), this driver will probably need to register its * own major number, and in doing so, no longer need to register with USB. * At that point the probe routine and hiddev_driver struct below will no * longer be useful. */ /* We never attach in this manner, and rely on HID to connect us. This * is why there is no disconnect routine defined in the usb_driver either. */ static int hiddev_usbd_probe(struct usb_interface *intf, const struct usb_device_id *hiddev_info) { return -ENODEV; } static /* const */ struct usb_driver hiddev_driver = { .owner = THIS_MODULE, .name = "hiddev", .probe = hiddev_usbd_probe, }; int __init hiddev_init(void) { devfs_mk_dir("usb/hid"); return usb_register(&hiddev_driver); } void hiddev_exit(void) { usb_deregister(&hiddev_driver); devfs_remove("usb/hid"); } |