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 dinfo.bustype = BUS_USB; 645 dinfo.busnum = dev->bus->busnum; 646 dinfo.devnum = dev->devnum; 647 dinfo.ifnum = usbhid->ifnum; 648 dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); 649 dinfo.product = le16_to_cpu(dev->descriptor.idProduct); 650 dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); 651 dinfo.num_applications = hid->maxapplication; 652 653 r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ? 654 -EFAULT : 0; 655 break; 656 } 657 658 case HIDIOCGFLAG: 659 r = put_user(list->flags, (int __user *)arg) ? 660 -EFAULT : 0; 661 break; 662 663 case HIDIOCSFLAG: 664 { 665 int newflags; 666 667 if (get_user(newflags, (int __user *)arg)) { 668 r = -EFAULT; 669 break; 670 } 671 672 if ((newflags & ~HIDDEV_FLAGS) != 0 || 673 ((newflags & HIDDEV_FLAG_REPORT) != 0 && 674 (newflags & HIDDEV_FLAG_UREF) == 0)) 675 break; 676 677 list->flags = newflags; 678 679 r = 0; 680 break; 681 } 682 683 case HIDIOCGSTRING: 684 r = hiddev_ioctl_string(hiddev, cmd, user_arg); 685 break; 686 687 case HIDIOCINITREPORT: 688 usbhid_init_reports(hid); 689 r = 0; 690 break; 691 692 case HIDIOCGREPORT: 693 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { 694 r = -EFAULT; 695 break; 696 } 697 698 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) 699 break; 700 701 report = hiddev_lookup_report(hid, &rinfo); 702 if (report == NULL) 703 break; 704 705 usbhid_submit_report(hid, report, USB_DIR_IN); 706 usbhid_wait_io(hid); 707 708 r = 0; 709 break; 710 711 case HIDIOCSREPORT: 712 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { 713 r = -EFAULT; 714 break; 715 } 716 717 if (rinfo.report_type == HID_REPORT_TYPE_INPUT) 718 break; 719 720 report = hiddev_lookup_report(hid, &rinfo); 721 if (report == NULL) 722 break; 723 724 usbhid_submit_report(hid, report, USB_DIR_OUT); 725 usbhid_wait_io(hid); 726 727 r = 0; 728 break; 729 730 case HIDIOCGREPORTINFO: 731 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { 732 r = -EFAULT; 733 break; 734 } 735 736 report = hiddev_lookup_report(hid, &rinfo); 737 if (report == NULL) 738 break; 739 740 rinfo.num_fields = report->maxfield; 741 742 r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ? 743 -EFAULT : 0; 744 break; 745 746 case HIDIOCGFIELDINFO: 747 if (copy_from_user(&finfo, user_arg, sizeof(finfo))) { 748 r = -EFAULT; 749 break; 750 } 751 752 rinfo.report_type = finfo.report_type; 753 rinfo.report_id = finfo.report_id; 754 755 report = hiddev_lookup_report(hid, &rinfo); 756 if (report == NULL) 757 break; 758 759 if (finfo.field_index >= report->maxfield) 760 break; 761 762 field = report->field[finfo.field_index]; 763 memset(&finfo, 0, sizeof(finfo)); 764 finfo.report_type = rinfo.report_type; 765 finfo.report_id = rinfo.report_id; 766 finfo.field_index = field->report_count - 1; 767 finfo.maxusage = field->maxusage; 768 finfo.flags = field->flags; 769 finfo.physical = field->physical; 770 finfo.logical = field->logical; 771 finfo.application = field->application; 772 finfo.logical_minimum = field->logical_minimum; 773 finfo.logical_maximum = field->logical_maximum; 774 finfo.physical_minimum = field->physical_minimum; 775 finfo.physical_maximum = field->physical_maximum; 776 finfo.unit_exponent = field->unit_exponent; 777 finfo.unit = field->unit; 778 779 r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ? 780 -EFAULT : 0; 781 break; 782 783 case HIDIOCGUCODE: 784 /* fall through */ 785 case HIDIOCGUSAGE: 786 case HIDIOCSUSAGE: 787 case HIDIOCGUSAGES: 788 case HIDIOCSUSAGES: 789 case HIDIOCGCOLLECTIONINDEX: 790 r = hiddev_ioctl_usage(hiddev, cmd, user_arg); 791 break; 792 793 case HIDIOCGCOLLECTIONINFO: 794 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) { 795 r = -EFAULT; 796 break; 797 } 798 799 if (cinfo.index >= hid->maxcollection) 800 break; 801 802 cinfo.type = hid->collection[cinfo.index].type; 803 cinfo.usage = hid->collection[cinfo.index].usage; 804 cinfo.level = hid->collection[cinfo.index].level; 805 806 r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ? 807 -EFAULT : 0; 808 break; 809 810 default: 811 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) 812 break; 813 814 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { 815 int len = strlen(hid->name) + 1; 816 if (len > _IOC_SIZE(cmd)) 817 len = _IOC_SIZE(cmd); 818 r = copy_to_user(user_arg, hid->name, len) ? 819 -EFAULT : len; 820 break; 821 } 822 823 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { 824 int len = strlen(hid->phys) + 1; 825 if (len > _IOC_SIZE(cmd)) 826 len = _IOC_SIZE(cmd); 827 r = copy_to_user(user_arg, hid->phys, len) ? 828 -EFAULT : len; 829 break; 830 } 831 } 832 833 ret_unlock: 834 mutex_unlock(&hiddev->existancelock); 835 return r; 836 } 837 838 #ifdef CONFIG_COMPAT 839 static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 840 { 841 return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 842 } 843 #endif 844 845 static const struct file_operations hiddev_fops = { 846 .owner = THIS_MODULE, 847 .read = hiddev_read, 848 .write = hiddev_write, 849 .poll = hiddev_poll, 850 .open = hiddev_open, 851 .release = hiddev_release, 852 .unlocked_ioctl = hiddev_ioctl, 853 .fasync = hiddev_fasync, 854 #ifdef CONFIG_COMPAT 855 .compat_ioctl = hiddev_compat_ioctl, 856 #endif 857 .llseek = noop_llseek, 858 }; 859 860 static char *hiddev_devnode(struct device *dev, mode_t *mode) 861 { 862 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 863 } 864 865 static struct usb_class_driver hiddev_class = { 866 .name = "hiddev%d", 867 .devnode = hiddev_devnode, 868 .fops = &hiddev_fops, 869 .minor_base = HIDDEV_MINOR_BASE, 870 }; 871 872 /* 873 * This is where hid.c calls us to connect a hid device to the hiddev driver 874 */ 875 int hiddev_connect(struct hid_device *hid, unsigned int force) 876 { 877 struct hiddev *hiddev; 878 struct usbhid_device *usbhid = hid->driver_data; 879 int retval; 880 881 if (!force) { 882 unsigned int i; 883 for (i = 0; i < hid->maxcollection; i++) 884 if (hid->collection[i].type == 885 HID_COLLECTION_APPLICATION && 886 !IS_INPUT_APPLICATION(hid->collection[i].usage)) 887 break; 888 889 if (i == hid->maxcollection) 890 return -1; 891 } 892 893 if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) 894 return -1; 895 896 init_waitqueue_head(&hiddev->wait); 897 INIT_LIST_HEAD(&hiddev->list); 898 spin_lock_init(&hiddev->list_lock); 899 mutex_init(&hiddev->existancelock); 900 hid->hiddev = hiddev; 901 hiddev->hid = hid; 902 hiddev->exist = 1; 903 retval = usb_register_dev(usbhid->intf, &hiddev_class); 904 if (retval) { 905 hid_err(hid, "Not able to get a minor for this device\n"); 906 hid->hiddev = NULL; 907 kfree(hiddev); 908 return -1; 909 } 910 return 0; 911 } 912 913 /* 914 * This is where hid.c calls us to disconnect a hiddev device from the 915 * corresponding hid device (usually because the usb device has disconnected) 916 */ 917 static struct usb_class_driver hiddev_class; 918 void hiddev_disconnect(struct hid_device *hid) 919 { 920 struct hiddev *hiddev = hid->hiddev; 921 struct usbhid_device *usbhid = hid->driver_data; 922 923 mutex_lock(&hiddev->existancelock); 924 hiddev->exist = 0; 925 926 usb_deregister_dev(usbhid->intf, &hiddev_class); 927 928 if (hiddev->open) { 929 mutex_unlock(&hiddev->existancelock); 930 usbhid_close(hiddev->hid); 931 wake_up_interruptible(&hiddev->wait); 932 } else { 933 mutex_unlock(&hiddev->existancelock); 934 kfree(hiddev); 935 } 936 } 937