1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 2001 Paul Stewart 4 * Copyright (c) 2001 Vojtech Pavlik 5 * 6 * HID char devices, giving access to raw HID device events. 7 */ 8 9 /* 10 * 11 * Should you need to contact me, the author, you can do so either by 12 * e-mail - mail your message to Paul Stewart <stewart@wetlogic.net> 13 */ 14 15 #include <linux/poll.h> 16 #include <linux/slab.h> 17 #include <linux/sched/signal.h> 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <linux/input.h> 21 #include <linux/usb.h> 22 #include <linux/hid.h> 23 #include <linux/hiddev.h> 24 #include <linux/compat.h> 25 #include <linux/vmalloc.h> 26 #include <linux/nospec.h> 27 #include "usbhid.h" 28 29 #ifdef CONFIG_USB_DYNAMIC_MINORS 30 #define HIDDEV_MINOR_BASE 0 31 #define HIDDEV_MINORS 256 32 #else 33 #define HIDDEV_MINOR_BASE 96 34 #define HIDDEV_MINORS 16 35 #endif 36 #define HIDDEV_BUFFER_SIZE 2048 37 38 struct hiddev_list { 39 struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE]; 40 int head; 41 int tail; 42 unsigned flags; 43 struct fasync_struct *fasync; 44 struct hiddev *hiddev; 45 struct list_head node; 46 struct mutex thread_lock; 47 }; 48 49 /* 50 * Find a report, given the report's type and ID. The ID can be specified 51 * indirectly by REPORT_ID_FIRST (which returns the first report of the given 52 * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the 53 * given type which follows old_id. 54 */ 55 static struct hid_report * 56 hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo) 57 { 58 unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK; 59 unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK; 60 struct hid_report_enum *report_enum; 61 struct hid_report *report; 62 struct list_head *list; 63 64 if (rinfo->report_type < HID_REPORT_TYPE_MIN || 65 rinfo->report_type > HID_REPORT_TYPE_MAX) 66 return NULL; 67 68 report_enum = hid->report_enum + 69 (rinfo->report_type - HID_REPORT_TYPE_MIN); 70 71 switch (flags) { 72 case 0: /* Nothing to do -- report_id is already set correctly */ 73 break; 74 75 case HID_REPORT_ID_FIRST: 76 if (list_empty(&report_enum->report_list)) 77 return NULL; 78 79 list = report_enum->report_list.next; 80 report = list_entry(list, struct hid_report, list); 81 rinfo->report_id = report->id; 82 break; 83 84 case HID_REPORT_ID_NEXT: 85 report = report_enum->report_id_hash[rid]; 86 if (!report) 87 return NULL; 88 89 list = report->list.next; 90 if (list == &report_enum->report_list) 91 return NULL; 92 93 report = list_entry(list, struct hid_report, list); 94 rinfo->report_id = report->id; 95 break; 96 97 default: 98 return NULL; 99 } 100 101 return report_enum->report_id_hash[rinfo->report_id]; 102 } 103 104 /* 105 * Perform an exhaustive search of the report table for a usage, given its 106 * type and usage id. 107 */ 108 static struct hid_field * 109 hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref) 110 { 111 int i, j; 112 struct hid_report *report; 113 struct hid_report_enum *report_enum; 114 struct hid_field *field; 115 116 if (uref->report_type < HID_REPORT_TYPE_MIN || 117 uref->report_type > HID_REPORT_TYPE_MAX) 118 return NULL; 119 120 report_enum = hid->report_enum + 121 (uref->report_type - HID_REPORT_TYPE_MIN); 122 123 list_for_each_entry(report, &report_enum->report_list, list) { 124 for (i = 0; i < report->maxfield; i++) { 125 field = report->field[i]; 126 for (j = 0; j < field->maxusage; j++) { 127 if (field->usage[j].hid == uref->usage_code) { 128 uref->report_id = report->id; 129 uref->field_index = i; 130 uref->usage_index = j; 131 return field; 132 } 133 } 134 } 135 } 136 137 return NULL; 138 } 139 140 static void hiddev_send_event(struct hid_device *hid, 141 struct hiddev_usage_ref *uref) 142 { 143 struct hiddev *hiddev = hid->hiddev; 144 struct hiddev_list *list; 145 unsigned long flags; 146 147 spin_lock_irqsave(&hiddev->list_lock, flags); 148 list_for_each_entry(list, &hiddev->list, node) { 149 if (uref->field_index != HID_FIELD_INDEX_NONE || 150 (list->flags & HIDDEV_FLAG_REPORT) != 0) { 151 list->buffer[list->head] = *uref; 152 list->head = (list->head + 1) & 153 (HIDDEV_BUFFER_SIZE - 1); 154 kill_fasync(&list->fasync, SIGIO, POLL_IN); 155 } 156 } 157 spin_unlock_irqrestore(&hiddev->list_lock, flags); 158 159 wake_up_interruptible(&hiddev->wait); 160 } 161 162 /* 163 * This is where hid.c calls into hiddev to pass an event that occurred over 164 * the interrupt pipe 165 */ 166 void hiddev_hid_event(struct hid_device *hid, struct hid_field *field, 167 struct hid_usage *usage, __s32 value) 168 { 169 unsigned type = field->report_type; 170 struct hiddev_usage_ref uref; 171 172 uref.report_type = 173 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : 174 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : 175 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); 176 uref.report_id = field->report->id; 177 uref.field_index = field->index; 178 uref.usage_index = (usage - field->usage); 179 uref.usage_code = usage->hid; 180 uref.value = value; 181 182 hiddev_send_event(hid, &uref); 183 } 184 EXPORT_SYMBOL_GPL(hiddev_hid_event); 185 186 void hiddev_report_event(struct hid_device *hid, struct hid_report *report) 187 { 188 unsigned type = report->type; 189 struct hiddev_usage_ref uref; 190 191 memset(&uref, 0, sizeof(uref)); 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 = report->id; 197 uref.field_index = HID_FIELD_INDEX_NONE; 198 199 hiddev_send_event(hid, &uref); 200 } 201 202 /* 203 * fasync file op 204 */ 205 static int hiddev_fasync(int fd, struct file *file, int on) 206 { 207 struct hiddev_list *list = file->private_data; 208 209 return fasync_helper(fd, file, on, &list->fasync); 210 } 211 212 213 /* 214 * release file op 215 */ 216 static int hiddev_release(struct inode * inode, struct file * file) 217 { 218 struct hiddev_list *list = file->private_data; 219 unsigned long flags; 220 221 spin_lock_irqsave(&list->hiddev->list_lock, flags); 222 list_del(&list->node); 223 spin_unlock_irqrestore(&list->hiddev->list_lock, flags); 224 225 mutex_lock(&list->hiddev->existancelock); 226 if (!--list->hiddev->open) { 227 if (list->hiddev->exist) { 228 hid_hw_close(list->hiddev->hid); 229 hid_hw_power(list->hiddev->hid, PM_HINT_NORMAL); 230 } else { 231 mutex_unlock(&list->hiddev->existancelock); 232 kfree(list->hiddev); 233 vfree(list); 234 return 0; 235 } 236 } 237 238 mutex_unlock(&list->hiddev->existancelock); 239 vfree(list); 240 241 return 0; 242 } 243 244 /* 245 * open file op 246 */ 247 static int hiddev_open(struct inode *inode, struct file *file) 248 { 249 struct hiddev_list *list; 250 struct usb_interface *intf; 251 struct hid_device *hid; 252 struct hiddev *hiddev; 253 int res; 254 255 intf = usbhid_find_interface(iminor(inode)); 256 if (!intf) 257 return -ENODEV; 258 hid = usb_get_intfdata(intf); 259 hiddev = hid->hiddev; 260 261 if (!(list = vzalloc(sizeof(struct hiddev_list)))) 262 return -ENOMEM; 263 mutex_init(&list->thread_lock); 264 list->hiddev = hiddev; 265 file->private_data = list; 266 267 /* 268 * no need for locking because the USB major number 269 * is shared which usbcore guards against disconnect 270 */ 271 if (list->hiddev->exist) { 272 if (!list->hiddev->open++) { 273 res = hid_hw_open(hiddev->hid); 274 if (res < 0) 275 goto bail; 276 } 277 } else { 278 res = -ENODEV; 279 goto bail; 280 } 281 282 spin_lock_irq(&list->hiddev->list_lock); 283 list_add_tail(&list->node, &hiddev->list); 284 spin_unlock_irq(&list->hiddev->list_lock); 285 286 mutex_lock(&hiddev->existancelock); 287 if (!list->hiddev->open++) 288 if (list->hiddev->exist) { 289 struct hid_device *hid = hiddev->hid; 290 res = hid_hw_power(hid, PM_HINT_FULLON); 291 if (res < 0) 292 goto bail_unlock; 293 res = hid_hw_open(hid); 294 if (res < 0) 295 goto bail_normal_power; 296 } 297 mutex_unlock(&hiddev->existancelock); 298 return 0; 299 bail_normal_power: 300 hid_hw_power(hid, PM_HINT_NORMAL); 301 bail_unlock: 302 mutex_unlock(&hiddev->existancelock); 303 bail: 304 file->private_data = NULL; 305 vfree(list); 306 return res; 307 } 308 309 /* 310 * "write" file op 311 */ 312 static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) 313 { 314 return -EINVAL; 315 } 316 317 /* 318 * "read" file op 319 */ 320 static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) 321 { 322 DEFINE_WAIT(wait); 323 struct hiddev_list *list = file->private_data; 324 int event_size; 325 int retval; 326 327 event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? 328 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); 329 330 if (count < event_size) 331 return 0; 332 333 /* lock against other threads */ 334 retval = mutex_lock_interruptible(&list->thread_lock); 335 if (retval) 336 return -ERESTARTSYS; 337 338 while (retval == 0) { 339 if (list->head == list->tail) { 340 prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE); 341 342 while (list->head == list->tail) { 343 if (signal_pending(current)) { 344 retval = -ERESTARTSYS; 345 break; 346 } 347 if (!list->hiddev->exist) { 348 retval = -EIO; 349 break; 350 } 351 if (file->f_flags & O_NONBLOCK) { 352 retval = -EAGAIN; 353 break; 354 } 355 356 /* let O_NONBLOCK tasks run */ 357 mutex_unlock(&list->thread_lock); 358 schedule(); 359 if (mutex_lock_interruptible(&list->thread_lock)) { 360 finish_wait(&list->hiddev->wait, &wait); 361 return -EINTR; 362 } 363 set_current_state(TASK_INTERRUPTIBLE); 364 } 365 finish_wait(&list->hiddev->wait, &wait); 366 367 } 368 369 if (retval) { 370 mutex_unlock(&list->thread_lock); 371 return retval; 372 } 373 374 375 while (list->head != list->tail && 376 retval + event_size <= count) { 377 if ((list->flags & HIDDEV_FLAG_UREF) == 0) { 378 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) { 379 struct hiddev_event event; 380 381 event.hid = list->buffer[list->tail].usage_code; 382 event.value = list->buffer[list->tail].value; 383 if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) { 384 mutex_unlock(&list->thread_lock); 385 return -EFAULT; 386 } 387 retval += sizeof(struct hiddev_event); 388 } 389 } else { 390 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE || 391 (list->flags & HIDDEV_FLAG_REPORT) != 0) { 392 393 if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) { 394 mutex_unlock(&list->thread_lock); 395 return -EFAULT; 396 } 397 retval += sizeof(struct hiddev_usage_ref); 398 } 399 } 400 list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); 401 } 402 403 } 404 mutex_unlock(&list->thread_lock); 405 406 return retval; 407 } 408 409 /* 410 * "poll" file op 411 * No kernel lock - fine 412 */ 413 static __poll_t hiddev_poll(struct file *file, poll_table *wait) 414 { 415 struct hiddev_list *list = file->private_data; 416 417 poll_wait(file, &list->hiddev->wait, wait); 418 if (list->head != list->tail) 419 return EPOLLIN | EPOLLRDNORM; 420 if (!list->hiddev->exist) 421 return EPOLLERR | EPOLLHUP; 422 return 0; 423 } 424 425 /* 426 * "ioctl" file op 427 */ 428 static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) 429 { 430 struct hid_device *hid = hiddev->hid; 431 struct hiddev_report_info rinfo; 432 struct hiddev_usage_ref_multi *uref_multi = NULL; 433 struct hiddev_usage_ref *uref; 434 struct hid_report *report; 435 struct hid_field *field; 436 int i; 437 438 uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); 439 if (!uref_multi) 440 return -ENOMEM; 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 uref->field_index = array_index_nospec(uref->field_index, 461 report->maxfield); 462 463 field = report->field[uref->field_index]; 464 if (uref->usage_index >= field->maxusage) 465 goto inval; 466 uref->usage_index = array_index_nospec(uref->usage_index, 467 field->maxusage); 468 469 uref->usage_code = field->usage[uref->usage_index].hid; 470 471 if (copy_to_user(user_arg, uref, sizeof(*uref))) 472 goto fault; 473 474 goto goodreturn; 475 476 default: 477 if (cmd != HIDIOCGUSAGE && 478 cmd != HIDIOCGUSAGES && 479 uref->report_type == HID_REPORT_TYPE_INPUT) 480 goto inval; 481 482 if (uref->report_id == HID_REPORT_ID_UNKNOWN) { 483 field = hiddev_lookup_usage(hid, uref); 484 if (field == NULL) 485 goto inval; 486 } else { 487 rinfo.report_type = uref->report_type; 488 rinfo.report_id = uref->report_id; 489 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 490 goto inval; 491 492 if (uref->field_index >= report->maxfield) 493 goto inval; 494 uref->field_index = array_index_nospec(uref->field_index, 495 report->maxfield); 496 497 field = report->field[uref->field_index]; 498 499 if (cmd == HIDIOCGCOLLECTIONINDEX) { 500 if (uref->usage_index >= field->maxusage) 501 goto inval; 502 uref->usage_index = 503 array_index_nospec(uref->usage_index, 504 field->maxusage); 505 } else if (uref->usage_index >= field->report_count) 506 goto inval; 507 } 508 509 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { 510 if (uref_multi->num_values > HID_MAX_MULTI_USAGES || 511 uref->usage_index + uref_multi->num_values > 512 field->report_count) 513 goto inval; 514 515 uref->usage_index = 516 array_index_nospec(uref->usage_index, 517 field->report_count - 518 uref_multi->num_values); 519 } 520 521 switch (cmd) { 522 case HIDIOCGUSAGE: 523 uref->value = field->value[uref->usage_index]; 524 if (copy_to_user(user_arg, uref, sizeof(*uref))) 525 goto fault; 526 goto goodreturn; 527 528 case HIDIOCSUSAGE: 529 field->value[uref->usage_index] = uref->value; 530 goto goodreturn; 531 532 case HIDIOCGCOLLECTIONINDEX: 533 i = field->usage[uref->usage_index].collection_index; 534 kfree(uref_multi); 535 return i; 536 case HIDIOCGUSAGES: 537 for (i = 0; i < uref_multi->num_values; i++) 538 uref_multi->values[i] = 539 field->value[uref->usage_index + i]; 540 if (copy_to_user(user_arg, uref_multi, 541 sizeof(*uref_multi))) 542 goto fault; 543 goto goodreturn; 544 case HIDIOCSUSAGES: 545 for (i = 0; i < uref_multi->num_values; i++) 546 field->value[uref->usage_index + i] = 547 uref_multi->values[i]; 548 goto goodreturn; 549 } 550 551 goodreturn: 552 kfree(uref_multi); 553 return 0; 554 fault: 555 kfree(uref_multi); 556 return -EFAULT; 557 inval: 558 kfree(uref_multi); 559 return -EINVAL; 560 } 561 } 562 563 static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) 564 { 565 struct hid_device *hid = hiddev->hid; 566 struct usb_device *dev = hid_to_usb_dev(hid); 567 int idx, len; 568 char *buf; 569 570 if (get_user(idx, (int __user *)user_arg)) 571 return -EFAULT; 572 573 if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) 574 return -ENOMEM; 575 576 if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) { 577 kfree(buf); 578 return -EINVAL; 579 } 580 581 if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { 582 kfree(buf); 583 return -EFAULT; 584 } 585 586 kfree(buf); 587 588 return len; 589 } 590 591 static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 592 { 593 struct hiddev_list *list = file->private_data; 594 struct hiddev *hiddev = list->hiddev; 595 struct hid_device *hid; 596 struct hiddev_collection_info cinfo; 597 struct hiddev_report_info rinfo; 598 struct hiddev_field_info finfo; 599 struct hiddev_devinfo dinfo; 600 struct hid_report *report; 601 struct hid_field *field; 602 void __user *user_arg = (void __user *)arg; 603 int i, r = -EINVAL; 604 605 /* Called without BKL by compat methods so no BKL taken */ 606 607 mutex_lock(&hiddev->existancelock); 608 if (!hiddev->exist) { 609 r = -ENODEV; 610 goto ret_unlock; 611 } 612 613 hid = hiddev->hid; 614 615 switch (cmd) { 616 617 case HIDIOCGVERSION: 618 r = put_user(HID_VERSION, (int __user *)arg) ? 619 -EFAULT : 0; 620 break; 621 622 case HIDIOCAPPLICATION: 623 if (arg >= hid->maxapplication) 624 break; 625 626 for (i = 0; i < hid->maxcollection; i++) 627 if (hid->collection[i].type == 628 HID_COLLECTION_APPLICATION && arg-- == 0) 629 break; 630 631 if (i < hid->maxcollection) 632 r = hid->collection[i].usage; 633 break; 634 635 case HIDIOCGDEVINFO: 636 { 637 struct usb_device *dev = hid_to_usb_dev(hid); 638 struct usbhid_device *usbhid = hid->driver_data; 639 640 memset(&dinfo, 0, sizeof(dinfo)); 641 642 dinfo.bustype = BUS_USB; 643 dinfo.busnum = dev->bus->busnum; 644 dinfo.devnum = dev->devnum; 645 dinfo.ifnum = usbhid->ifnum; 646 dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); 647 dinfo.product = le16_to_cpu(dev->descriptor.idProduct); 648 dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); 649 dinfo.num_applications = hid->maxapplication; 650 651 r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ? 652 -EFAULT : 0; 653 break; 654 } 655 656 case HIDIOCGFLAG: 657 r = put_user(list->flags, (int __user *)arg) ? 658 -EFAULT : 0; 659 break; 660 661 case HIDIOCSFLAG: 662 { 663 int newflags; 664 665 if (get_user(newflags, (int __user *)arg)) { 666 r = -EFAULT; 667 break; 668 } 669 670 if ((newflags & ~HIDDEV_FLAGS) != 0 || 671 ((newflags & HIDDEV_FLAG_REPORT) != 0 && 672 (newflags & HIDDEV_FLAG_UREF) == 0)) 673 break; 674 675 list->flags = newflags; 676 677 r = 0; 678 break; 679 } 680 681 case HIDIOCGSTRING: 682 r = hiddev_ioctl_string(hiddev, cmd, user_arg); 683 break; 684 685 case HIDIOCINITREPORT: 686 usbhid_init_reports(hid); 687 hiddev->initialized = true; 688 r = 0; 689 break; 690 691 case HIDIOCGREPORT: 692 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { 693 r = -EFAULT; 694 break; 695 } 696 697 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) 698 break; 699 700 report = hiddev_lookup_report(hid, &rinfo); 701 if (report == NULL) 702 break; 703 704 hid_hw_request(hid, report, HID_REQ_GET_REPORT); 705 hid_hw_wait(hid); 706 707 r = 0; 708 break; 709 710 case HIDIOCSREPORT: 711 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { 712 r = -EFAULT; 713 break; 714 } 715 716 if (rinfo.report_type == HID_REPORT_TYPE_INPUT) 717 break; 718 719 report = hiddev_lookup_report(hid, &rinfo); 720 if (report == NULL) 721 break; 722 723 hid_hw_request(hid, report, HID_REQ_SET_REPORT); 724 hid_hw_wait(hid); 725 726 r = 0; 727 break; 728 729 case HIDIOCGREPORTINFO: 730 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { 731 r = -EFAULT; 732 break; 733 } 734 735 report = hiddev_lookup_report(hid, &rinfo); 736 if (report == NULL) 737 break; 738 739 rinfo.num_fields = report->maxfield; 740 741 r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ? 742 -EFAULT : 0; 743 break; 744 745 case HIDIOCGFIELDINFO: 746 if (copy_from_user(&finfo, user_arg, sizeof(finfo))) { 747 r = -EFAULT; 748 break; 749 } 750 751 rinfo.report_type = finfo.report_type; 752 rinfo.report_id = finfo.report_id; 753 754 report = hiddev_lookup_report(hid, &rinfo); 755 if (report == NULL) 756 break; 757 758 if (finfo.field_index >= report->maxfield) 759 break; 760 finfo.field_index = array_index_nospec(finfo.field_index, 761 report->maxfield); 762 763 field = report->field[finfo.field_index]; 764 memset(&finfo, 0, sizeof(finfo)); 765 finfo.report_type = rinfo.report_type; 766 finfo.report_id = rinfo.report_id; 767 finfo.field_index = field->report_count - 1; 768 finfo.maxusage = field->maxusage; 769 finfo.flags = field->flags; 770 finfo.physical = field->physical; 771 finfo.logical = field->logical; 772 finfo.application = field->application; 773 finfo.logical_minimum = field->logical_minimum; 774 finfo.logical_maximum = field->logical_maximum; 775 finfo.physical_minimum = field->physical_minimum; 776 finfo.physical_maximum = field->physical_maximum; 777 finfo.unit_exponent = field->unit_exponent; 778 finfo.unit = field->unit; 779 780 r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ? 781 -EFAULT : 0; 782 break; 783 784 case HIDIOCGUCODE: 785 /* fall through */ 786 case HIDIOCGUSAGE: 787 case HIDIOCSUSAGE: 788 case HIDIOCGUSAGES: 789 case HIDIOCSUSAGES: 790 case HIDIOCGCOLLECTIONINDEX: 791 if (!hiddev->initialized) { 792 usbhid_init_reports(hid); 793 hiddev->initialized = true; 794 } 795 r = hiddev_ioctl_usage(hiddev, cmd, user_arg); 796 break; 797 798 case HIDIOCGCOLLECTIONINFO: 799 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) { 800 r = -EFAULT; 801 break; 802 } 803 804 if (cinfo.index >= hid->maxcollection) 805 break; 806 cinfo.index = array_index_nospec(cinfo.index, 807 hid->maxcollection); 808 809 cinfo.type = hid->collection[cinfo.index].type; 810 cinfo.usage = hid->collection[cinfo.index].usage; 811 cinfo.level = hid->collection[cinfo.index].level; 812 813 r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ? 814 -EFAULT : 0; 815 break; 816 817 default: 818 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) 819 break; 820 821 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { 822 int len = strlen(hid->name) + 1; 823 if (len > _IOC_SIZE(cmd)) 824 len = _IOC_SIZE(cmd); 825 r = copy_to_user(user_arg, hid->name, len) ? 826 -EFAULT : len; 827 break; 828 } 829 830 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { 831 int len = strlen(hid->phys) + 1; 832 if (len > _IOC_SIZE(cmd)) 833 len = _IOC_SIZE(cmd); 834 r = copy_to_user(user_arg, hid->phys, len) ? 835 -EFAULT : len; 836 break; 837 } 838 } 839 840 ret_unlock: 841 mutex_unlock(&hiddev->existancelock); 842 return r; 843 } 844 845 #ifdef CONFIG_COMPAT 846 static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 847 { 848 return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 849 } 850 #endif 851 852 static const struct file_operations hiddev_fops = { 853 .owner = THIS_MODULE, 854 .read = hiddev_read, 855 .write = hiddev_write, 856 .poll = hiddev_poll, 857 .open = hiddev_open, 858 .release = hiddev_release, 859 .unlocked_ioctl = hiddev_ioctl, 860 .fasync = hiddev_fasync, 861 #ifdef CONFIG_COMPAT 862 .compat_ioctl = hiddev_compat_ioctl, 863 #endif 864 .llseek = noop_llseek, 865 }; 866 867 static char *hiddev_devnode(struct device *dev, umode_t *mode) 868 { 869 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 870 } 871 872 static struct usb_class_driver hiddev_class = { 873 .name = "hiddev%d", 874 .devnode = hiddev_devnode, 875 .fops = &hiddev_fops, 876 .minor_base = HIDDEV_MINOR_BASE, 877 }; 878 879 /* 880 * This is where hid.c calls us to connect a hid device to the hiddev driver 881 */ 882 int hiddev_connect(struct hid_device *hid, unsigned int force) 883 { 884 struct hiddev *hiddev; 885 struct usbhid_device *usbhid = hid->driver_data; 886 int retval; 887 888 if (!force) { 889 unsigned int i; 890 for (i = 0; i < hid->maxcollection; i++) 891 if (hid->collection[i].type == 892 HID_COLLECTION_APPLICATION && 893 !IS_INPUT_APPLICATION(hid->collection[i].usage)) 894 break; 895 896 if (i == hid->maxcollection) 897 return -1; 898 } 899 900 if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) 901 return -1; 902 903 init_waitqueue_head(&hiddev->wait); 904 INIT_LIST_HEAD(&hiddev->list); 905 spin_lock_init(&hiddev->list_lock); 906 mutex_init(&hiddev->existancelock); 907 hid->hiddev = hiddev; 908 hiddev->hid = hid; 909 hiddev->exist = 1; 910 retval = usb_register_dev(usbhid->intf, &hiddev_class); 911 if (retval) { 912 hid_err(hid, "Not able to get a minor for this device\n"); 913 hid->hiddev = NULL; 914 kfree(hiddev); 915 return -1; 916 } 917 918 /* 919 * If HID_QUIRK_NO_INIT_REPORTS is set, make sure we don't initialize 920 * the reports. 921 */ 922 hiddev->initialized = hid->quirks & HID_QUIRK_NO_INIT_REPORTS; 923 924 hiddev->minor = usbhid->intf->minor; 925 926 return 0; 927 } 928 929 /* 930 * This is where hid.c calls us to disconnect a hiddev device from the 931 * corresponding hid device (usually because the usb device has disconnected) 932 */ 933 static struct usb_class_driver hiddev_class; 934 void hiddev_disconnect(struct hid_device *hid) 935 { 936 struct hiddev *hiddev = hid->hiddev; 937 struct usbhid_device *usbhid = hid->driver_data; 938 939 usb_deregister_dev(usbhid->intf, &hiddev_class); 940 941 mutex_lock(&hiddev->existancelock); 942 hiddev->exist = 0; 943 944 if (hiddev->open) { 945 mutex_unlock(&hiddev->existancelock); 946 hid_hw_close(hiddev->hid); 947 wake_up_interruptible(&hiddev->wait); 948 } else { 949 mutex_unlock(&hiddev->existancelock); 950 kfree(hiddev); 951 } 952 } 953