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 static int __hiddev_open(struct hiddev *hiddev, struct file *file) 245 { 246 struct hiddev_list *list; 247 int error; 248 249 lockdep_assert_held(&hiddev->existancelock); 250 251 list = vzalloc(sizeof(*list)); 252 if (!list) 253 return -ENOMEM; 254 255 mutex_init(&list->thread_lock); 256 list->hiddev = hiddev; 257 258 if (!hiddev->open++) { 259 error = hid_hw_power(hiddev->hid, PM_HINT_FULLON); 260 if (error < 0) 261 goto err_drop_count; 262 263 error = hid_hw_open(hiddev->hid); 264 if (error < 0) 265 goto err_normal_power; 266 } 267 268 spin_lock_irq(&hiddev->list_lock); 269 list_add_tail(&list->node, &hiddev->list); 270 spin_unlock_irq(&hiddev->list_lock); 271 272 file->private_data = list; 273 274 return 0; 275 276 err_normal_power: 277 hid_hw_power(hiddev->hid, PM_HINT_NORMAL); 278 err_drop_count: 279 hiddev->open--; 280 vfree(list); 281 return error; 282 } 283 284 /* 285 * open file op 286 */ 287 static int hiddev_open(struct inode *inode, struct file *file) 288 { 289 struct usb_interface *intf; 290 struct hid_device *hid; 291 struct hiddev *hiddev; 292 int res; 293 294 intf = usbhid_find_interface(iminor(inode)); 295 if (!intf) 296 return -ENODEV; 297 298 hid = usb_get_intfdata(intf); 299 hiddev = hid->hiddev; 300 301 mutex_lock(&hiddev->existancelock); 302 res = hiddev->exist ? __hiddev_open(hiddev, file) : -ENODEV; 303 mutex_unlock(&hiddev->existancelock); 304 305 return res; 306 } 307 308 /* 309 * "write" file op 310 */ 311 static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) 312 { 313 return -EINVAL; 314 } 315 316 /* 317 * "read" file op 318 */ 319 static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) 320 { 321 DEFINE_WAIT(wait); 322 struct hiddev_list *list = file->private_data; 323 int event_size; 324 int retval; 325 326 event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? 327 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); 328 329 if (count < event_size) 330 return 0; 331 332 /* lock against other threads */ 333 retval = mutex_lock_interruptible(&list->thread_lock); 334 if (retval) 335 return -ERESTARTSYS; 336 337 while (retval == 0) { 338 if (list->head == list->tail) { 339 prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE); 340 341 while (list->head == list->tail) { 342 if (signal_pending(current)) { 343 retval = -ERESTARTSYS; 344 break; 345 } 346 if (!list->hiddev->exist) { 347 retval = -EIO; 348 break; 349 } 350 if (file->f_flags & O_NONBLOCK) { 351 retval = -EAGAIN; 352 break; 353 } 354 355 /* let O_NONBLOCK tasks run */ 356 mutex_unlock(&list->thread_lock); 357 schedule(); 358 if (mutex_lock_interruptible(&list->thread_lock)) { 359 finish_wait(&list->hiddev->wait, &wait); 360 return -EINTR; 361 } 362 set_current_state(TASK_INTERRUPTIBLE); 363 } 364 finish_wait(&list->hiddev->wait, &wait); 365 366 } 367 368 if (retval) { 369 mutex_unlock(&list->thread_lock); 370 return retval; 371 } 372 373 374 while (list->head != list->tail && 375 retval + event_size <= count) { 376 if ((list->flags & HIDDEV_FLAG_UREF) == 0) { 377 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) { 378 struct hiddev_event event; 379 380 event.hid = list->buffer[list->tail].usage_code; 381 event.value = list->buffer[list->tail].value; 382 if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) { 383 mutex_unlock(&list->thread_lock); 384 return -EFAULT; 385 } 386 retval += sizeof(struct hiddev_event); 387 } 388 } else { 389 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE || 390 (list->flags & HIDDEV_FLAG_REPORT) != 0) { 391 392 if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) { 393 mutex_unlock(&list->thread_lock); 394 return -EFAULT; 395 } 396 retval += sizeof(struct hiddev_usage_ref); 397 } 398 } 399 list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); 400 } 401 402 } 403 mutex_unlock(&list->thread_lock); 404 405 return retval; 406 } 407 408 /* 409 * "poll" file op 410 * No kernel lock - fine 411 */ 412 static __poll_t hiddev_poll(struct file *file, poll_table *wait) 413 { 414 struct hiddev_list *list = file->private_data; 415 416 poll_wait(file, &list->hiddev->wait, wait); 417 if (list->head != list->tail) 418 return EPOLLIN | EPOLLRDNORM | EPOLLOUT; 419 if (!list->hiddev->exist) 420 return EPOLLERR | EPOLLHUP; 421 return 0; 422 } 423 424 /* 425 * "ioctl" file op 426 */ 427 static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) 428 { 429 struct hid_device *hid = hiddev->hid; 430 struct hiddev_report_info rinfo; 431 struct hiddev_usage_ref_multi *uref_multi = NULL; 432 struct hiddev_usage_ref *uref; 433 struct hid_report *report; 434 struct hid_field *field; 435 int i; 436 437 uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); 438 if (!uref_multi) 439 return -ENOMEM; 440 uref = &uref_multi->uref; 441 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { 442 if (copy_from_user(uref_multi, user_arg, 443 sizeof(*uref_multi))) 444 goto fault; 445 } else { 446 if (copy_from_user(uref, user_arg, sizeof(*uref))) 447 goto fault; 448 } 449 450 switch (cmd) { 451 case HIDIOCGUCODE: 452 rinfo.report_type = uref->report_type; 453 rinfo.report_id = uref->report_id; 454 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 455 goto inval; 456 457 if (uref->field_index >= report->maxfield) 458 goto inval; 459 uref->field_index = array_index_nospec(uref->field_index, 460 report->maxfield); 461 462 field = report->field[uref->field_index]; 463 if (uref->usage_index >= field->maxusage) 464 goto inval; 465 uref->usage_index = array_index_nospec(uref->usage_index, 466 field->maxusage); 467 468 uref->usage_code = field->usage[uref->usage_index].hid; 469 470 if (copy_to_user(user_arg, uref, sizeof(*uref))) 471 goto fault; 472 473 goto goodreturn; 474 475 default: 476 if (cmd != HIDIOCGUSAGE && 477 cmd != HIDIOCGUSAGES && 478 uref->report_type == HID_REPORT_TYPE_INPUT) 479 goto inval; 480 481 if (uref->report_id == HID_REPORT_ID_UNKNOWN) { 482 field = hiddev_lookup_usage(hid, uref); 483 if (field == NULL) 484 goto inval; 485 } else { 486 rinfo.report_type = uref->report_type; 487 rinfo.report_id = uref->report_id; 488 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 489 goto inval; 490 491 if (uref->field_index >= report->maxfield) 492 goto inval; 493 uref->field_index = array_index_nospec(uref->field_index, 494 report->maxfield); 495 496 field = report->field[uref->field_index]; 497 498 if (cmd == HIDIOCGCOLLECTIONINDEX) { 499 if (uref->usage_index >= field->maxusage) 500 goto inval; 501 uref->usage_index = 502 array_index_nospec(uref->usage_index, 503 field->maxusage); 504 } else if (uref->usage_index >= field->report_count) 505 goto inval; 506 } 507 508 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { 509 if (uref_multi->num_values > HID_MAX_MULTI_USAGES || 510 uref->usage_index + uref_multi->num_values > 511 field->report_count) 512 goto inval; 513 514 uref->usage_index = 515 array_index_nospec(uref->usage_index, 516 field->report_count - 517 uref_multi->num_values); 518 } 519 520 switch (cmd) { 521 case HIDIOCGUSAGE: 522 if (uref->usage_index >= field->report_count) 523 goto inval; 524 uref->value = field->value[uref->usage_index]; 525 if (copy_to_user(user_arg, uref, sizeof(*uref))) 526 goto fault; 527 goto goodreturn; 528 529 case HIDIOCSUSAGE: 530 if (uref->usage_index >= field->report_count) 531 goto inval; 532 field->value[uref->usage_index] = uref->value; 533 goto goodreturn; 534 535 case HIDIOCGCOLLECTIONINDEX: 536 i = field->usage[uref->usage_index].collection_index; 537 kfree(uref_multi); 538 return i; 539 case HIDIOCGUSAGES: 540 for (i = 0; i < uref_multi->num_values; i++) 541 uref_multi->values[i] = 542 field->value[uref->usage_index + i]; 543 if (copy_to_user(user_arg, uref_multi, 544 sizeof(*uref_multi))) 545 goto fault; 546 goto goodreturn; 547 case HIDIOCSUSAGES: 548 for (i = 0; i < uref_multi->num_values; i++) 549 field->value[uref->usage_index + i] = 550 uref_multi->values[i]; 551 goto goodreturn; 552 } 553 554 goodreturn: 555 kfree(uref_multi); 556 return 0; 557 fault: 558 kfree(uref_multi); 559 return -EFAULT; 560 inval: 561 kfree(uref_multi); 562 return -EINVAL; 563 } 564 } 565 566 static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) 567 { 568 struct hid_device *hid = hiddev->hid; 569 struct usb_device *dev = hid_to_usb_dev(hid); 570 int idx, len; 571 char *buf; 572 573 if (get_user(idx, (int __user *)user_arg)) 574 return -EFAULT; 575 576 if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) 577 return -ENOMEM; 578 579 if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) { 580 kfree(buf); 581 return -EINVAL; 582 } 583 584 if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { 585 kfree(buf); 586 return -EFAULT; 587 } 588 589 kfree(buf); 590 591 return len; 592 } 593 594 static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 595 { 596 struct hiddev_list *list = file->private_data; 597 struct hiddev *hiddev = list->hiddev; 598 struct hid_device *hid; 599 struct hiddev_collection_info cinfo; 600 struct hiddev_report_info rinfo; 601 struct hiddev_field_info finfo; 602 struct hiddev_devinfo dinfo; 603 struct hid_report *report; 604 struct hid_field *field; 605 void __user *user_arg = (void __user *)arg; 606 int i, r = -EINVAL; 607 608 /* Called without BKL by compat methods so no BKL taken */ 609 610 mutex_lock(&hiddev->existancelock); 611 if (!hiddev->exist) { 612 r = -ENODEV; 613 goto ret_unlock; 614 } 615 616 hid = hiddev->hid; 617 618 switch (cmd) { 619 620 case HIDIOCGVERSION: 621 r = put_user(HID_VERSION, (int __user *)arg) ? 622 -EFAULT : 0; 623 break; 624 625 case HIDIOCAPPLICATION: 626 if (arg >= hid->maxapplication) 627 break; 628 629 for (i = 0; i < hid->maxcollection; i++) 630 if (hid->collection[i].type == 631 HID_COLLECTION_APPLICATION && arg-- == 0) 632 break; 633 634 if (i < hid->maxcollection) 635 r = hid->collection[i].usage; 636 break; 637 638 case HIDIOCGDEVINFO: 639 { 640 struct usb_device *dev = hid_to_usb_dev(hid); 641 struct usbhid_device *usbhid = hid->driver_data; 642 643 memset(&dinfo, 0, sizeof(dinfo)); 644 645 dinfo.bustype = BUS_USB; 646 dinfo.busnum = dev->bus->busnum; 647 dinfo.devnum = dev->devnum; 648 dinfo.ifnum = usbhid->ifnum; 649 dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); 650 dinfo.product = le16_to_cpu(dev->descriptor.idProduct); 651 dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); 652 dinfo.num_applications = hid->maxapplication; 653 654 r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ? 655 -EFAULT : 0; 656 break; 657 } 658 659 case HIDIOCGFLAG: 660 r = put_user(list->flags, (int __user *)arg) ? 661 -EFAULT : 0; 662 break; 663 664 case HIDIOCSFLAG: 665 { 666 int newflags; 667 668 if (get_user(newflags, (int __user *)arg)) { 669 r = -EFAULT; 670 break; 671 } 672 673 if ((newflags & ~HIDDEV_FLAGS) != 0 || 674 ((newflags & HIDDEV_FLAG_REPORT) != 0 && 675 (newflags & HIDDEV_FLAG_UREF) == 0)) 676 break; 677 678 list->flags = newflags; 679 680 r = 0; 681 break; 682 } 683 684 case HIDIOCGSTRING: 685 r = hiddev_ioctl_string(hiddev, cmd, user_arg); 686 break; 687 688 case HIDIOCINITREPORT: 689 usbhid_init_reports(hid); 690 hiddev->initialized = true; 691 r = 0; 692 break; 693 694 case HIDIOCGREPORT: 695 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { 696 r = -EFAULT; 697 break; 698 } 699 700 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) 701 break; 702 703 report = hiddev_lookup_report(hid, &rinfo); 704 if (report == NULL) 705 break; 706 707 hid_hw_request(hid, report, HID_REQ_GET_REPORT); 708 hid_hw_wait(hid); 709 710 r = 0; 711 break; 712 713 case HIDIOCSREPORT: 714 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { 715 r = -EFAULT; 716 break; 717 } 718 719 if (rinfo.report_type == HID_REPORT_TYPE_INPUT) 720 break; 721 722 report = hiddev_lookup_report(hid, &rinfo); 723 if (report == NULL) 724 break; 725 726 hid_hw_request(hid, report, HID_REQ_SET_REPORT); 727 hid_hw_wait(hid); 728 729 r = 0; 730 break; 731 732 case HIDIOCGREPORTINFO: 733 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { 734 r = -EFAULT; 735 break; 736 } 737 738 report = hiddev_lookup_report(hid, &rinfo); 739 if (report == NULL) 740 break; 741 742 rinfo.num_fields = report->maxfield; 743 744 r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ? 745 -EFAULT : 0; 746 break; 747 748 case HIDIOCGFIELDINFO: 749 if (copy_from_user(&finfo, user_arg, sizeof(finfo))) { 750 r = -EFAULT; 751 break; 752 } 753 754 rinfo.report_type = finfo.report_type; 755 rinfo.report_id = finfo.report_id; 756 757 report = hiddev_lookup_report(hid, &rinfo); 758 if (report == NULL) 759 break; 760 761 if (finfo.field_index >= report->maxfield) 762 break; 763 finfo.field_index = array_index_nospec(finfo.field_index, 764 report->maxfield); 765 766 field = report->field[finfo.field_index]; 767 memset(&finfo, 0, sizeof(finfo)); 768 finfo.report_type = rinfo.report_type; 769 finfo.report_id = rinfo.report_id; 770 finfo.field_index = field->report_count - 1; 771 finfo.maxusage = field->maxusage; 772 finfo.flags = field->flags; 773 finfo.physical = field->physical; 774 finfo.logical = field->logical; 775 finfo.application = field->application; 776 finfo.logical_minimum = field->logical_minimum; 777 finfo.logical_maximum = field->logical_maximum; 778 finfo.physical_minimum = field->physical_minimum; 779 finfo.physical_maximum = field->physical_maximum; 780 finfo.unit_exponent = field->unit_exponent; 781 finfo.unit = field->unit; 782 783 r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ? 784 -EFAULT : 0; 785 break; 786 787 case HIDIOCGUCODE: 788 case HIDIOCGUSAGE: 789 case HIDIOCSUSAGE: 790 case HIDIOCGUSAGES: 791 case HIDIOCSUSAGES: 792 case HIDIOCGCOLLECTIONINDEX: 793 if (!hiddev->initialized) { 794 usbhid_init_reports(hid); 795 hiddev->initialized = true; 796 } 797 r = hiddev_ioctl_usage(hiddev, cmd, user_arg); 798 break; 799 800 case HIDIOCGCOLLECTIONINFO: 801 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) { 802 r = -EFAULT; 803 break; 804 } 805 806 if (cinfo.index >= hid->maxcollection) 807 break; 808 cinfo.index = array_index_nospec(cinfo.index, 809 hid->maxcollection); 810 811 cinfo.type = hid->collection[cinfo.index].type; 812 cinfo.usage = hid->collection[cinfo.index].usage; 813 cinfo.level = hid->collection[cinfo.index].level; 814 815 r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ? 816 -EFAULT : 0; 817 break; 818 819 default: 820 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) 821 break; 822 823 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { 824 int len = strlen(hid->name) + 1; 825 if (len > _IOC_SIZE(cmd)) 826 len = _IOC_SIZE(cmd); 827 r = copy_to_user(user_arg, hid->name, len) ? 828 -EFAULT : len; 829 break; 830 } 831 832 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { 833 int len = strlen(hid->phys) + 1; 834 if (len > _IOC_SIZE(cmd)) 835 len = _IOC_SIZE(cmd); 836 r = copy_to_user(user_arg, hid->phys, len) ? 837 -EFAULT : len; 838 break; 839 } 840 } 841 842 ret_unlock: 843 mutex_unlock(&hiddev->existancelock); 844 return r; 845 } 846 847 static const struct file_operations hiddev_fops = { 848 .owner = THIS_MODULE, 849 .read = hiddev_read, 850 .write = hiddev_write, 851 .poll = hiddev_poll, 852 .open = hiddev_open, 853 .release = hiddev_release, 854 .unlocked_ioctl = hiddev_ioctl, 855 .fasync = hiddev_fasync, 856 .compat_ioctl = compat_ptr_ioctl, 857 .llseek = noop_llseek, 858 }; 859 860 static char *hiddev_devnode(struct device *dev, umode_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 -EINVAL; 891 } 892 893 if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) 894 return -ENOMEM; 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 retval; 909 } 910 911 /* 912 * If HID_QUIRK_NO_INIT_REPORTS is set, make sure we don't initialize 913 * the reports. 914 */ 915 hiddev->initialized = hid->quirks & HID_QUIRK_NO_INIT_REPORTS; 916 917 hiddev->minor = usbhid->intf->minor; 918 919 return 0; 920 } 921 922 /* 923 * This is where hid.c calls us to disconnect a hiddev device from the 924 * corresponding hid device (usually because the usb device has disconnected) 925 */ 926 static struct usb_class_driver hiddev_class; 927 void hiddev_disconnect(struct hid_device *hid) 928 { 929 struct hiddev *hiddev = hid->hiddev; 930 struct usbhid_device *usbhid = hid->driver_data; 931 932 usb_deregister_dev(usbhid->intf, &hiddev_class); 933 934 mutex_lock(&hiddev->existancelock); 935 hiddev->exist = 0; 936 937 if (hiddev->open) { 938 hid_hw_close(hiddev->hid); 939 wake_up_interruptible(&hiddev->wait); 940 mutex_unlock(&hiddev->existancelock); 941 } else { 942 mutex_unlock(&hiddev->existancelock); 943 kfree(hiddev); 944 } 945 } 946