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 /* 288 * recheck exist with existance lock held to 289 * avoid opening a disconnected device 290 */ 291 if (!list->hiddev->exist) { 292 res = -ENODEV; 293 goto bail_unlock; 294 } 295 if (!list->hiddev->open++) 296 if (list->hiddev->exist) { 297 struct hid_device *hid = hiddev->hid; 298 res = hid_hw_power(hid, PM_HINT_FULLON); 299 if (res < 0) 300 goto bail_unlock; 301 res = hid_hw_open(hid); 302 if (res < 0) 303 goto bail_normal_power; 304 } 305 mutex_unlock(&hiddev->existancelock); 306 return 0; 307 bail_normal_power: 308 hid_hw_power(hid, PM_HINT_NORMAL); 309 bail_unlock: 310 mutex_unlock(&hiddev->existancelock); 311 312 spin_lock_irq(&list->hiddev->list_lock); 313 list_del(&list->node); 314 spin_unlock_irq(&list->hiddev->list_lock); 315 bail: 316 file->private_data = NULL; 317 vfree(list); 318 return res; 319 } 320 321 /* 322 * "write" file op 323 */ 324 static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) 325 { 326 return -EINVAL; 327 } 328 329 /* 330 * "read" file op 331 */ 332 static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) 333 { 334 DEFINE_WAIT(wait); 335 struct hiddev_list *list = file->private_data; 336 int event_size; 337 int retval; 338 339 event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? 340 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); 341 342 if (count < event_size) 343 return 0; 344 345 /* lock against other threads */ 346 retval = mutex_lock_interruptible(&list->thread_lock); 347 if (retval) 348 return -ERESTARTSYS; 349 350 while (retval == 0) { 351 if (list->head == list->tail) { 352 prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE); 353 354 while (list->head == list->tail) { 355 if (signal_pending(current)) { 356 retval = -ERESTARTSYS; 357 break; 358 } 359 if (!list->hiddev->exist) { 360 retval = -EIO; 361 break; 362 } 363 if (file->f_flags & O_NONBLOCK) { 364 retval = -EAGAIN; 365 break; 366 } 367 368 /* let O_NONBLOCK tasks run */ 369 mutex_unlock(&list->thread_lock); 370 schedule(); 371 if (mutex_lock_interruptible(&list->thread_lock)) { 372 finish_wait(&list->hiddev->wait, &wait); 373 return -EINTR; 374 } 375 set_current_state(TASK_INTERRUPTIBLE); 376 } 377 finish_wait(&list->hiddev->wait, &wait); 378 379 } 380 381 if (retval) { 382 mutex_unlock(&list->thread_lock); 383 return retval; 384 } 385 386 387 while (list->head != list->tail && 388 retval + event_size <= count) { 389 if ((list->flags & HIDDEV_FLAG_UREF) == 0) { 390 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) { 391 struct hiddev_event event; 392 393 event.hid = list->buffer[list->tail].usage_code; 394 event.value = list->buffer[list->tail].value; 395 if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) { 396 mutex_unlock(&list->thread_lock); 397 return -EFAULT; 398 } 399 retval += sizeof(struct hiddev_event); 400 } 401 } else { 402 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE || 403 (list->flags & HIDDEV_FLAG_REPORT) != 0) { 404 405 if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) { 406 mutex_unlock(&list->thread_lock); 407 return -EFAULT; 408 } 409 retval += sizeof(struct hiddev_usage_ref); 410 } 411 } 412 list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); 413 } 414 415 } 416 mutex_unlock(&list->thread_lock); 417 418 return retval; 419 } 420 421 /* 422 * "poll" file op 423 * No kernel lock - fine 424 */ 425 static __poll_t hiddev_poll(struct file *file, poll_table *wait) 426 { 427 struct hiddev_list *list = file->private_data; 428 429 poll_wait(file, &list->hiddev->wait, wait); 430 if (list->head != list->tail) 431 return EPOLLIN | EPOLLRDNORM | EPOLLOUT; 432 if (!list->hiddev->exist) 433 return EPOLLERR | EPOLLHUP; 434 return 0; 435 } 436 437 /* 438 * "ioctl" file op 439 */ 440 static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) 441 { 442 struct hid_device *hid = hiddev->hid; 443 struct hiddev_report_info rinfo; 444 struct hiddev_usage_ref_multi *uref_multi = NULL; 445 struct hiddev_usage_ref *uref; 446 struct hid_report *report; 447 struct hid_field *field; 448 int i; 449 450 uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); 451 if (!uref_multi) 452 return -ENOMEM; 453 uref = &uref_multi->uref; 454 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { 455 if (copy_from_user(uref_multi, user_arg, 456 sizeof(*uref_multi))) 457 goto fault; 458 } else { 459 if (copy_from_user(uref, user_arg, sizeof(*uref))) 460 goto fault; 461 } 462 463 switch (cmd) { 464 case HIDIOCGUCODE: 465 rinfo.report_type = uref->report_type; 466 rinfo.report_id = uref->report_id; 467 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 468 goto inval; 469 470 if (uref->field_index >= report->maxfield) 471 goto inval; 472 uref->field_index = array_index_nospec(uref->field_index, 473 report->maxfield); 474 475 field = report->field[uref->field_index]; 476 if (uref->usage_index >= field->maxusage) 477 goto inval; 478 uref->usage_index = array_index_nospec(uref->usage_index, 479 field->maxusage); 480 481 uref->usage_code = field->usage[uref->usage_index].hid; 482 483 if (copy_to_user(user_arg, uref, sizeof(*uref))) 484 goto fault; 485 486 goto goodreturn; 487 488 default: 489 if (cmd != HIDIOCGUSAGE && 490 cmd != HIDIOCGUSAGES && 491 uref->report_type == HID_REPORT_TYPE_INPUT) 492 goto inval; 493 494 if (uref->report_id == HID_REPORT_ID_UNKNOWN) { 495 field = hiddev_lookup_usage(hid, uref); 496 if (field == NULL) 497 goto inval; 498 } else { 499 rinfo.report_type = uref->report_type; 500 rinfo.report_id = uref->report_id; 501 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 502 goto inval; 503 504 if (uref->field_index >= report->maxfield) 505 goto inval; 506 uref->field_index = array_index_nospec(uref->field_index, 507 report->maxfield); 508 509 field = report->field[uref->field_index]; 510 511 if (cmd == HIDIOCGCOLLECTIONINDEX) { 512 if (uref->usage_index >= field->maxusage) 513 goto inval; 514 uref->usage_index = 515 array_index_nospec(uref->usage_index, 516 field->maxusage); 517 } else if (uref->usage_index >= field->report_count) 518 goto inval; 519 } 520 521 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { 522 if (uref_multi->num_values > HID_MAX_MULTI_USAGES || 523 uref->usage_index + uref_multi->num_values > 524 field->report_count) 525 goto inval; 526 527 uref->usage_index = 528 array_index_nospec(uref->usage_index, 529 field->report_count - 530 uref_multi->num_values); 531 } 532 533 switch (cmd) { 534 case HIDIOCGUSAGE: 535 uref->value = field->value[uref->usage_index]; 536 if (copy_to_user(user_arg, uref, sizeof(*uref))) 537 goto fault; 538 goto goodreturn; 539 540 case HIDIOCSUSAGE: 541 field->value[uref->usage_index] = uref->value; 542 goto goodreturn; 543 544 case HIDIOCGCOLLECTIONINDEX: 545 i = field->usage[uref->usage_index].collection_index; 546 kfree(uref_multi); 547 return i; 548 case HIDIOCGUSAGES: 549 for (i = 0; i < uref_multi->num_values; i++) 550 uref_multi->values[i] = 551 field->value[uref->usage_index + i]; 552 if (copy_to_user(user_arg, uref_multi, 553 sizeof(*uref_multi))) 554 goto fault; 555 goto goodreturn; 556 case HIDIOCSUSAGES: 557 for (i = 0; i < uref_multi->num_values; i++) 558 field->value[uref->usage_index + i] = 559 uref_multi->values[i]; 560 goto goodreturn; 561 } 562 563 goodreturn: 564 kfree(uref_multi); 565 return 0; 566 fault: 567 kfree(uref_multi); 568 return -EFAULT; 569 inval: 570 kfree(uref_multi); 571 return -EINVAL; 572 } 573 } 574 575 static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) 576 { 577 struct hid_device *hid = hiddev->hid; 578 struct usb_device *dev = hid_to_usb_dev(hid); 579 int idx, len; 580 char *buf; 581 582 if (get_user(idx, (int __user *)user_arg)) 583 return -EFAULT; 584 585 if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) 586 return -ENOMEM; 587 588 if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) { 589 kfree(buf); 590 return -EINVAL; 591 } 592 593 if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { 594 kfree(buf); 595 return -EFAULT; 596 } 597 598 kfree(buf); 599 600 return len; 601 } 602 603 static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 604 { 605 struct hiddev_list *list = file->private_data; 606 struct hiddev *hiddev = list->hiddev; 607 struct hid_device *hid; 608 struct hiddev_collection_info cinfo; 609 struct hiddev_report_info rinfo; 610 struct hiddev_field_info finfo; 611 struct hiddev_devinfo dinfo; 612 struct hid_report *report; 613 struct hid_field *field; 614 void __user *user_arg = (void __user *)arg; 615 int i, r = -EINVAL; 616 617 /* Called without BKL by compat methods so no BKL taken */ 618 619 mutex_lock(&hiddev->existancelock); 620 if (!hiddev->exist) { 621 r = -ENODEV; 622 goto ret_unlock; 623 } 624 625 hid = hiddev->hid; 626 627 switch (cmd) { 628 629 case HIDIOCGVERSION: 630 r = put_user(HID_VERSION, (int __user *)arg) ? 631 -EFAULT : 0; 632 break; 633 634 case HIDIOCAPPLICATION: 635 if (arg >= hid->maxapplication) 636 break; 637 638 for (i = 0; i < hid->maxcollection; i++) 639 if (hid->collection[i].type == 640 HID_COLLECTION_APPLICATION && arg-- == 0) 641 break; 642 643 if (i < hid->maxcollection) 644 r = hid->collection[i].usage; 645 break; 646 647 case HIDIOCGDEVINFO: 648 { 649 struct usb_device *dev = hid_to_usb_dev(hid); 650 struct usbhid_device *usbhid = hid->driver_data; 651 652 memset(&dinfo, 0, sizeof(dinfo)); 653 654 dinfo.bustype = BUS_USB; 655 dinfo.busnum = dev->bus->busnum; 656 dinfo.devnum = dev->devnum; 657 dinfo.ifnum = usbhid->ifnum; 658 dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); 659 dinfo.product = le16_to_cpu(dev->descriptor.idProduct); 660 dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); 661 dinfo.num_applications = hid->maxapplication; 662 663 r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ? 664 -EFAULT : 0; 665 break; 666 } 667 668 case HIDIOCGFLAG: 669 r = put_user(list->flags, (int __user *)arg) ? 670 -EFAULT : 0; 671 break; 672 673 case HIDIOCSFLAG: 674 { 675 int newflags; 676 677 if (get_user(newflags, (int __user *)arg)) { 678 r = -EFAULT; 679 break; 680 } 681 682 if ((newflags & ~HIDDEV_FLAGS) != 0 || 683 ((newflags & HIDDEV_FLAG_REPORT) != 0 && 684 (newflags & HIDDEV_FLAG_UREF) == 0)) 685 break; 686 687 list->flags = newflags; 688 689 r = 0; 690 break; 691 } 692 693 case HIDIOCGSTRING: 694 r = hiddev_ioctl_string(hiddev, cmd, user_arg); 695 break; 696 697 case HIDIOCINITREPORT: 698 usbhid_init_reports(hid); 699 hiddev->initialized = true; 700 r = 0; 701 break; 702 703 case HIDIOCGREPORT: 704 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { 705 r = -EFAULT; 706 break; 707 } 708 709 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) 710 break; 711 712 report = hiddev_lookup_report(hid, &rinfo); 713 if (report == NULL) 714 break; 715 716 hid_hw_request(hid, report, HID_REQ_GET_REPORT); 717 hid_hw_wait(hid); 718 719 r = 0; 720 break; 721 722 case HIDIOCSREPORT: 723 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { 724 r = -EFAULT; 725 break; 726 } 727 728 if (rinfo.report_type == HID_REPORT_TYPE_INPUT) 729 break; 730 731 report = hiddev_lookup_report(hid, &rinfo); 732 if (report == NULL) 733 break; 734 735 hid_hw_request(hid, report, HID_REQ_SET_REPORT); 736 hid_hw_wait(hid); 737 738 r = 0; 739 break; 740 741 case HIDIOCGREPORTINFO: 742 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { 743 r = -EFAULT; 744 break; 745 } 746 747 report = hiddev_lookup_report(hid, &rinfo); 748 if (report == NULL) 749 break; 750 751 rinfo.num_fields = report->maxfield; 752 753 r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ? 754 -EFAULT : 0; 755 break; 756 757 case HIDIOCGFIELDINFO: 758 if (copy_from_user(&finfo, user_arg, sizeof(finfo))) { 759 r = -EFAULT; 760 break; 761 } 762 763 rinfo.report_type = finfo.report_type; 764 rinfo.report_id = finfo.report_id; 765 766 report = hiddev_lookup_report(hid, &rinfo); 767 if (report == NULL) 768 break; 769 770 if (finfo.field_index >= report->maxfield) 771 break; 772 finfo.field_index = array_index_nospec(finfo.field_index, 773 report->maxfield); 774 775 field = report->field[finfo.field_index]; 776 memset(&finfo, 0, sizeof(finfo)); 777 finfo.report_type = rinfo.report_type; 778 finfo.report_id = rinfo.report_id; 779 finfo.field_index = field->report_count - 1; 780 finfo.maxusage = field->maxusage; 781 finfo.flags = field->flags; 782 finfo.physical = field->physical; 783 finfo.logical = field->logical; 784 finfo.application = field->application; 785 finfo.logical_minimum = field->logical_minimum; 786 finfo.logical_maximum = field->logical_maximum; 787 finfo.physical_minimum = field->physical_minimum; 788 finfo.physical_maximum = field->physical_maximum; 789 finfo.unit_exponent = field->unit_exponent; 790 finfo.unit = field->unit; 791 792 r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ? 793 -EFAULT : 0; 794 break; 795 796 case HIDIOCGUCODE: 797 /* fall through */ 798 case HIDIOCGUSAGE: 799 case HIDIOCSUSAGE: 800 case HIDIOCGUSAGES: 801 case HIDIOCSUSAGES: 802 case HIDIOCGCOLLECTIONINDEX: 803 if (!hiddev->initialized) { 804 usbhid_init_reports(hid); 805 hiddev->initialized = true; 806 } 807 r = hiddev_ioctl_usage(hiddev, cmd, user_arg); 808 break; 809 810 case HIDIOCGCOLLECTIONINFO: 811 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) { 812 r = -EFAULT; 813 break; 814 } 815 816 if (cinfo.index >= hid->maxcollection) 817 break; 818 cinfo.index = array_index_nospec(cinfo.index, 819 hid->maxcollection); 820 821 cinfo.type = hid->collection[cinfo.index].type; 822 cinfo.usage = hid->collection[cinfo.index].usage; 823 cinfo.level = hid->collection[cinfo.index].level; 824 825 r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ? 826 -EFAULT : 0; 827 break; 828 829 default: 830 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) 831 break; 832 833 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { 834 int len = strlen(hid->name) + 1; 835 if (len > _IOC_SIZE(cmd)) 836 len = _IOC_SIZE(cmd); 837 r = copy_to_user(user_arg, hid->name, len) ? 838 -EFAULT : len; 839 break; 840 } 841 842 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { 843 int len = strlen(hid->phys) + 1; 844 if (len > _IOC_SIZE(cmd)) 845 len = _IOC_SIZE(cmd); 846 r = copy_to_user(user_arg, hid->phys, len) ? 847 -EFAULT : len; 848 break; 849 } 850 } 851 852 ret_unlock: 853 mutex_unlock(&hiddev->existancelock); 854 return r; 855 } 856 857 #ifdef CONFIG_COMPAT 858 static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 859 { 860 return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 861 } 862 #endif 863 864 static const struct file_operations hiddev_fops = { 865 .owner = THIS_MODULE, 866 .read = hiddev_read, 867 .write = hiddev_write, 868 .poll = hiddev_poll, 869 .open = hiddev_open, 870 .release = hiddev_release, 871 .unlocked_ioctl = hiddev_ioctl, 872 .fasync = hiddev_fasync, 873 #ifdef CONFIG_COMPAT 874 .compat_ioctl = hiddev_compat_ioctl, 875 #endif 876 .llseek = noop_llseek, 877 }; 878 879 static char *hiddev_devnode(struct device *dev, umode_t *mode) 880 { 881 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 882 } 883 884 static struct usb_class_driver hiddev_class = { 885 .name = "hiddev%d", 886 .devnode = hiddev_devnode, 887 .fops = &hiddev_fops, 888 .minor_base = HIDDEV_MINOR_BASE, 889 }; 890 891 /* 892 * This is where hid.c calls us to connect a hid device to the hiddev driver 893 */ 894 int hiddev_connect(struct hid_device *hid, unsigned int force) 895 { 896 struct hiddev *hiddev; 897 struct usbhid_device *usbhid = hid->driver_data; 898 int retval; 899 900 if (!force) { 901 unsigned int i; 902 for (i = 0; i < hid->maxcollection; i++) 903 if (hid->collection[i].type == 904 HID_COLLECTION_APPLICATION && 905 !IS_INPUT_APPLICATION(hid->collection[i].usage)) 906 break; 907 908 if (i == hid->maxcollection) 909 return -1; 910 } 911 912 if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) 913 return -1; 914 915 init_waitqueue_head(&hiddev->wait); 916 INIT_LIST_HEAD(&hiddev->list); 917 spin_lock_init(&hiddev->list_lock); 918 mutex_init(&hiddev->existancelock); 919 hid->hiddev = hiddev; 920 hiddev->hid = hid; 921 hiddev->exist = 1; 922 retval = usb_register_dev(usbhid->intf, &hiddev_class); 923 if (retval) { 924 hid_err(hid, "Not able to get a minor for this device\n"); 925 hid->hiddev = NULL; 926 kfree(hiddev); 927 return -1; 928 } 929 930 /* 931 * If HID_QUIRK_NO_INIT_REPORTS is set, make sure we don't initialize 932 * the reports. 933 */ 934 hiddev->initialized = hid->quirks & HID_QUIRK_NO_INIT_REPORTS; 935 936 hiddev->minor = usbhid->intf->minor; 937 938 return 0; 939 } 940 941 /* 942 * This is where hid.c calls us to disconnect a hiddev device from the 943 * corresponding hid device (usually because the usb device has disconnected) 944 */ 945 static struct usb_class_driver hiddev_class; 946 void hiddev_disconnect(struct hid_device *hid) 947 { 948 struct hiddev *hiddev = hid->hiddev; 949 struct usbhid_device *usbhid = hid->driver_data; 950 951 usb_deregister_dev(usbhid->intf, &hiddev_class); 952 953 mutex_lock(&hiddev->existancelock); 954 hiddev->exist = 0; 955 956 if (hiddev->open) { 957 mutex_unlock(&hiddev->existancelock); 958 hid_hw_close(hiddev->hid); 959 wake_up_interruptible(&hiddev->wait); 960 } else { 961 mutex_unlock(&hiddev->existancelock); 962 kfree(hiddev); 963 } 964 } 965