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/smp_lock.h> 33 #include <linux/input.h> 34 #include <linux/usb.h> 35 #include <linux/hid.h> 36 #include <linux/hiddev.h> 37 #include <linux/compat.h> 38 #include "usbhid.h" 39 40 #ifdef CONFIG_USB_DYNAMIC_MINORS 41 #define HIDDEV_MINOR_BASE 0 42 #define HIDDEV_MINORS 256 43 #else 44 #define HIDDEV_MINOR_BASE 96 45 #define HIDDEV_MINORS 16 46 #endif 47 #define HIDDEV_BUFFER_SIZE 2048 48 49 struct hiddev { 50 int exist; 51 int open; 52 struct mutex existancelock; 53 wait_queue_head_t wait; 54 struct hid_device *hid; 55 struct list_head list; 56 spinlock_t list_lock; 57 }; 58 59 struct hiddev_list { 60 struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE]; 61 int head; 62 int tail; 63 unsigned flags; 64 struct fasync_struct *fasync; 65 struct hiddev *hiddev; 66 struct list_head node; 67 struct mutex thread_lock; 68 }; 69 70 static struct usb_driver hiddev_driver; 71 72 /* 73 * Find a report, given the report's type and ID. The ID can be specified 74 * indirectly by REPORT_ID_FIRST (which returns the first report of the given 75 * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the 76 * given type which follows old_id. 77 */ 78 static struct hid_report * 79 hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo) 80 { 81 unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK; 82 unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK; 83 struct hid_report_enum *report_enum; 84 struct hid_report *report; 85 struct list_head *list; 86 87 if (rinfo->report_type < HID_REPORT_TYPE_MIN || 88 rinfo->report_type > HID_REPORT_TYPE_MAX) 89 return NULL; 90 91 report_enum = hid->report_enum + 92 (rinfo->report_type - HID_REPORT_TYPE_MIN); 93 94 switch (flags) { 95 case 0: /* Nothing to do -- report_id is already set correctly */ 96 break; 97 98 case HID_REPORT_ID_FIRST: 99 if (list_empty(&report_enum->report_list)) 100 return NULL; 101 102 list = report_enum->report_list.next; 103 report = list_entry(list, struct hid_report, list); 104 rinfo->report_id = report->id; 105 break; 106 107 case HID_REPORT_ID_NEXT: 108 report = report_enum->report_id_hash[rid]; 109 if (!report) 110 return NULL; 111 112 list = report->list.next; 113 if (list == &report_enum->report_list) 114 return NULL; 115 116 report = list_entry(list, struct hid_report, list); 117 rinfo->report_id = report->id; 118 break; 119 120 default: 121 return NULL; 122 } 123 124 return report_enum->report_id_hash[rinfo->report_id]; 125 } 126 127 /* 128 * Perform an exhaustive search of the report table for a usage, given its 129 * type and usage id. 130 */ 131 static struct hid_field * 132 hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref) 133 { 134 int i, j; 135 struct hid_report *report; 136 struct hid_report_enum *report_enum; 137 struct hid_field *field; 138 139 if (uref->report_type < HID_REPORT_TYPE_MIN || 140 uref->report_type > HID_REPORT_TYPE_MAX) 141 return NULL; 142 143 report_enum = hid->report_enum + 144 (uref->report_type - HID_REPORT_TYPE_MIN); 145 146 list_for_each_entry(report, &report_enum->report_list, list) { 147 for (i = 0; i < report->maxfield; i++) { 148 field = report->field[i]; 149 for (j = 0; j < field->maxusage; j++) { 150 if (field->usage[j].hid == uref->usage_code) { 151 uref->report_id = report->id; 152 uref->field_index = i; 153 uref->usage_index = j; 154 return field; 155 } 156 } 157 } 158 } 159 160 return NULL; 161 } 162 163 static void hiddev_send_event(struct hid_device *hid, 164 struct hiddev_usage_ref *uref) 165 { 166 struct hiddev *hiddev = hid->hiddev; 167 struct hiddev_list *list; 168 unsigned long flags; 169 170 spin_lock_irqsave(&hiddev->list_lock, flags); 171 list_for_each_entry(list, &hiddev->list, node) { 172 if (uref->field_index != HID_FIELD_INDEX_NONE || 173 (list->flags & HIDDEV_FLAG_REPORT) != 0) { 174 list->buffer[list->head] = *uref; 175 list->head = (list->head + 1) & 176 (HIDDEV_BUFFER_SIZE - 1); 177 kill_fasync(&list->fasync, SIGIO, POLL_IN); 178 } 179 } 180 spin_unlock_irqrestore(&hiddev->list_lock, flags); 181 182 wake_up_interruptible(&hiddev->wait); 183 } 184 185 /* 186 * This is where hid.c calls into hiddev to pass an event that occurred over 187 * the interrupt pipe 188 */ 189 void hiddev_hid_event(struct hid_device *hid, struct hid_field *field, 190 struct hid_usage *usage, __s32 value) 191 { 192 unsigned type = field->report_type; 193 struct hiddev_usage_ref uref; 194 195 uref.report_type = 196 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : 197 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : 198 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); 199 uref.report_id = field->report->id; 200 uref.field_index = field->index; 201 uref.usage_index = (usage - field->usage); 202 uref.usage_code = usage->hid; 203 uref.value = value; 204 205 hiddev_send_event(hid, &uref); 206 } 207 EXPORT_SYMBOL_GPL(hiddev_hid_event); 208 209 void hiddev_report_event(struct hid_device *hid, struct hid_report *report) 210 { 211 unsigned type = report->type; 212 struct hiddev_usage_ref uref; 213 214 memset(&uref, 0, sizeof(uref)); 215 uref.report_type = 216 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : 217 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : 218 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); 219 uref.report_id = report->id; 220 uref.field_index = HID_FIELD_INDEX_NONE; 221 222 hiddev_send_event(hid, &uref); 223 } 224 225 /* 226 * fasync file op 227 */ 228 static int hiddev_fasync(int fd, struct file *file, int on) 229 { 230 struct hiddev_list *list = file->private_data; 231 232 return fasync_helper(fd, file, on, &list->fasync); 233 } 234 235 236 /* 237 * release file op 238 */ 239 static int hiddev_release(struct inode * inode, struct file * file) 240 { 241 struct hiddev_list *list = file->private_data; 242 unsigned long flags; 243 244 spin_lock_irqsave(&list->hiddev->list_lock, flags); 245 list_del(&list->node); 246 spin_unlock_irqrestore(&list->hiddev->list_lock, flags); 247 248 if (!--list->hiddev->open) { 249 if (list->hiddev->exist) { 250 usbhid_close(list->hiddev->hid); 251 usbhid_put_power(list->hiddev->hid); 252 } else { 253 kfree(list->hiddev); 254 } 255 } 256 257 kfree(list); 258 259 return 0; 260 } 261 262 /* 263 * open file op 264 */ 265 static int hiddev_open(struct inode *inode, struct file *file) 266 { 267 struct hiddev_list *list; 268 struct usb_interface *intf; 269 struct hid_device *hid; 270 struct hiddev *hiddev; 271 int res; 272 273 intf = usb_find_interface(&hiddev_driver, iminor(inode)); 274 if (!intf) 275 return -ENODEV; 276 hid = usb_get_intfdata(intf); 277 hiddev = hid->hiddev; 278 279 if (!(list = kzalloc(sizeof(struct hiddev_list), GFP_KERNEL))) 280 return -ENOMEM; 281 mutex_init(&list->thread_lock); 282 list->hiddev = hiddev; 283 file->private_data = list; 284 285 /* 286 * no need for locking because the USB major number 287 * is shared which usbcore guards against disconnect 288 */ 289 if (list->hiddev->exist) { 290 if (!list->hiddev->open++) { 291 res = usbhid_open(hiddev->hid); 292 if (res < 0) { 293 res = -EIO; 294 goto bail; 295 } 296 } 297 } else { 298 res = -ENODEV; 299 goto bail; 300 } 301 302 spin_lock_irq(&list->hiddev->list_lock); 303 list_add_tail(&list->node, &hiddev->list); 304 spin_unlock_irq(&list->hiddev->list_lock); 305 306 if (!list->hiddev->open++) 307 if (list->hiddev->exist) { 308 struct hid_device *hid = hiddev->hid; 309 res = usbhid_get_power(hid); 310 if (res < 0) { 311 res = -EIO; 312 goto bail; 313 } 314 usbhid_open(hid); 315 } 316 return 0; 317 bail: 318 file->private_data = NULL; 319 kfree(list); 320 return res; 321 } 322 323 /* 324 * "write" file op 325 */ 326 static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) 327 { 328 return -EINVAL; 329 } 330 331 /* 332 * "read" file op 333 */ 334 static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) 335 { 336 DEFINE_WAIT(wait); 337 struct hiddev_list *list = file->private_data; 338 int event_size; 339 int retval; 340 341 event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? 342 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); 343 344 if (count < event_size) 345 return 0; 346 347 /* lock against other threads */ 348 retval = mutex_lock_interruptible(&list->thread_lock); 349 if (retval) 350 return -ERESTARTSYS; 351 352 while (retval == 0) { 353 if (list->head == list->tail) { 354 prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE); 355 356 while (list->head == list->tail) { 357 if (file->f_flags & O_NONBLOCK) { 358 retval = -EAGAIN; 359 break; 360 } 361 if (signal_pending(current)) { 362 retval = -ERESTARTSYS; 363 break; 364 } 365 if (!list->hiddev->exist) { 366 retval = -EIO; 367 break; 368 } 369 370 /* let O_NONBLOCK tasks run */ 371 mutex_unlock(&list->thread_lock); 372 schedule(); 373 if (mutex_lock_interruptible(&list->thread_lock)) 374 return -EINTR; 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 unsigned int 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 POLLIN | POLLRDNORM; 432 if (!list->hiddev->exist) 433 return POLLERR | POLLHUP; 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; 472 473 field = report->field[uref->field_index]; 474 if (uref->usage_index >= field->maxusage) 475 goto inval; 476 477 uref->usage_code = field->usage[uref->usage_index].hid; 478 479 if (copy_to_user(user_arg, uref, sizeof(*uref))) 480 goto fault; 481 482 goto goodreturn; 483 484 default: 485 if (cmd != HIDIOCGUSAGE && 486 cmd != HIDIOCGUSAGES && 487 uref->report_type == HID_REPORT_TYPE_INPUT) 488 goto inval; 489 490 if (uref->report_id == HID_REPORT_ID_UNKNOWN) { 491 field = hiddev_lookup_usage(hid, uref); 492 if (field == NULL) 493 goto inval; 494 } else { 495 rinfo.report_type = uref->report_type; 496 rinfo.report_id = uref->report_id; 497 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 498 goto inval; 499 500 if (uref->field_index >= report->maxfield) 501 goto inval; 502 503 field = report->field[uref->field_index]; 504 505 if (cmd == HIDIOCGCOLLECTIONINDEX) { 506 if (uref->usage_index >= field->maxusage) 507 goto inval; 508 } else if (uref->usage_index >= field->report_count) 509 goto inval; 510 511 else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) && 512 (uref_multi->num_values > HID_MAX_MULTI_USAGES || 513 uref->usage_index + uref_multi->num_values > field->report_count)) 514 goto inval; 515 } 516 517 switch (cmd) { 518 case HIDIOCGUSAGE: 519 uref->value = field->value[uref->usage_index]; 520 if (copy_to_user(user_arg, uref, sizeof(*uref))) 521 goto fault; 522 goto goodreturn; 523 524 case HIDIOCSUSAGE: 525 field->value[uref->usage_index] = uref->value; 526 goto goodreturn; 527 528 case HIDIOCGCOLLECTIONINDEX: 529 i = field->usage[uref->usage_index].collection_index; 530 kfree(uref_multi); 531 return i; 532 case HIDIOCGUSAGES: 533 for (i = 0; i < uref_multi->num_values; i++) 534 uref_multi->values[i] = 535 field->value[uref->usage_index + i]; 536 if (copy_to_user(user_arg, uref_multi, 537 sizeof(*uref_multi))) 538 goto fault; 539 goto goodreturn; 540 case HIDIOCSUSAGES: 541 for (i = 0; i < uref_multi->num_values; i++) 542 field->value[uref->usage_index + i] = 543 uref_multi->values[i]; 544 goto goodreturn; 545 } 546 547 goodreturn: 548 kfree(uref_multi); 549 return 0; 550 fault: 551 kfree(uref_multi); 552 return -EFAULT; 553 inval: 554 kfree(uref_multi); 555 return -EINVAL; 556 } 557 } 558 559 static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) 560 { 561 struct hid_device *hid = hiddev->hid; 562 struct usb_device *dev = hid_to_usb_dev(hid); 563 int idx, len; 564 char *buf; 565 566 if (get_user(idx, (int __user *)user_arg)) 567 return -EFAULT; 568 569 if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) 570 return -ENOMEM; 571 572 if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) { 573 kfree(buf); 574 return -EINVAL; 575 } 576 577 if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { 578 kfree(buf); 579 return -EFAULT; 580 } 581 582 kfree(buf); 583 584 return len; 585 } 586 587 static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 588 { 589 struct hiddev_list *list = file->private_data; 590 struct hiddev *hiddev = list->hiddev; 591 struct hid_device *hid = hiddev->hid; 592 struct usb_device *dev; 593 struct hiddev_collection_info cinfo; 594 struct hiddev_report_info rinfo; 595 struct hiddev_field_info finfo; 596 struct hiddev_devinfo dinfo; 597 struct hid_report *report; 598 struct hid_field *field; 599 struct usbhid_device *usbhid = hid->driver_data; 600 void __user *user_arg = (void __user *)arg; 601 int i, r; 602 603 /* Called without BKL by compat methods so no BKL taken */ 604 605 /* FIXME: Who or what stop this racing with a disconnect ?? */ 606 if (!hiddev->exist || !hid) 607 return -EIO; 608 609 dev = hid_to_usb_dev(hid); 610 611 switch (cmd) { 612 613 case HIDIOCGVERSION: 614 return put_user(HID_VERSION, (int __user *)arg); 615 616 case HIDIOCAPPLICATION: 617 if (arg < 0 || arg >= hid->maxapplication) 618 return -EINVAL; 619 620 for (i = 0; i < hid->maxcollection; i++) 621 if (hid->collection[i].type == 622 HID_COLLECTION_APPLICATION && arg-- == 0) 623 break; 624 625 if (i == hid->maxcollection) 626 return -EINVAL; 627 628 return hid->collection[i].usage; 629 630 case HIDIOCGDEVINFO: 631 dinfo.bustype = BUS_USB; 632 dinfo.busnum = dev->bus->busnum; 633 dinfo.devnum = dev->devnum; 634 dinfo.ifnum = usbhid->ifnum; 635 dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); 636 dinfo.product = le16_to_cpu(dev->descriptor.idProduct); 637 dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); 638 dinfo.num_applications = hid->maxapplication; 639 if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) 640 return -EFAULT; 641 642 return 0; 643 644 case HIDIOCGFLAG: 645 if (put_user(list->flags, (int __user *)arg)) 646 return -EFAULT; 647 648 return 0; 649 650 case HIDIOCSFLAG: 651 { 652 int newflags; 653 if (get_user(newflags, (int __user *)arg)) 654 return -EFAULT; 655 656 if ((newflags & ~HIDDEV_FLAGS) != 0 || 657 ((newflags & HIDDEV_FLAG_REPORT) != 0 && 658 (newflags & HIDDEV_FLAG_UREF) == 0)) 659 return -EINVAL; 660 661 list->flags = newflags; 662 663 return 0; 664 } 665 666 case HIDIOCGSTRING: 667 mutex_lock(&hiddev->existancelock); 668 if (hiddev->exist) 669 r = hiddev_ioctl_string(hiddev, cmd, user_arg); 670 else 671 r = -ENODEV; 672 mutex_unlock(&hiddev->existancelock); 673 return r; 674 675 case HIDIOCINITREPORT: 676 mutex_lock(&hiddev->existancelock); 677 if (!hiddev->exist) { 678 mutex_unlock(&hiddev->existancelock); 679 return -ENODEV; 680 } 681 usbhid_init_reports(hid); 682 mutex_unlock(&hiddev->existancelock); 683 684 return 0; 685 686 case HIDIOCGREPORT: 687 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) 688 return -EFAULT; 689 690 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) 691 return -EINVAL; 692 693 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 694 return -EINVAL; 695 696 mutex_lock(&hiddev->existancelock); 697 if (hiddev->exist) { 698 usbhid_submit_report(hid, report, USB_DIR_IN); 699 usbhid_wait_io(hid); 700 } 701 mutex_unlock(&hiddev->existancelock); 702 703 return 0; 704 705 case HIDIOCSREPORT: 706 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) 707 return -EFAULT; 708 709 if (rinfo.report_type == HID_REPORT_TYPE_INPUT) 710 return -EINVAL; 711 712 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 713 return -EINVAL; 714 715 mutex_lock(&hiddev->existancelock); 716 if (hiddev->exist) { 717 usbhid_submit_report(hid, report, USB_DIR_OUT); 718 usbhid_wait_io(hid); 719 } 720 mutex_unlock(&hiddev->existancelock); 721 722 return 0; 723 724 case HIDIOCGREPORTINFO: 725 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) 726 return -EFAULT; 727 728 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 729 return -EINVAL; 730 731 rinfo.num_fields = report->maxfield; 732 733 if (copy_to_user(user_arg, &rinfo, sizeof(rinfo))) 734 return -EFAULT; 735 736 return 0; 737 738 case HIDIOCGFIELDINFO: 739 if (copy_from_user(&finfo, user_arg, sizeof(finfo))) 740 return -EFAULT; 741 rinfo.report_type = finfo.report_type; 742 rinfo.report_id = finfo.report_id; 743 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 744 return -EINVAL; 745 746 if (finfo.field_index >= report->maxfield) 747 return -EINVAL; 748 749 field = report->field[finfo.field_index]; 750 memset(&finfo, 0, sizeof(finfo)); 751 finfo.report_type = rinfo.report_type; 752 finfo.report_id = rinfo.report_id; 753 finfo.field_index = field->report_count - 1; 754 finfo.maxusage = field->maxusage; 755 finfo.flags = field->flags; 756 finfo.physical = field->physical; 757 finfo.logical = field->logical; 758 finfo.application = field->application; 759 finfo.logical_minimum = field->logical_minimum; 760 finfo.logical_maximum = field->logical_maximum; 761 finfo.physical_minimum = field->physical_minimum; 762 finfo.physical_maximum = field->physical_maximum; 763 finfo.unit_exponent = field->unit_exponent; 764 finfo.unit = field->unit; 765 766 if (copy_to_user(user_arg, &finfo, sizeof(finfo))) 767 return -EFAULT; 768 769 return 0; 770 771 case HIDIOCGUCODE: 772 /* fall through */ 773 case HIDIOCGUSAGE: 774 case HIDIOCSUSAGE: 775 case HIDIOCGUSAGES: 776 case HIDIOCSUSAGES: 777 case HIDIOCGCOLLECTIONINDEX: 778 mutex_lock(&hiddev->existancelock); 779 if (hiddev->exist) 780 r = hiddev_ioctl_usage(hiddev, cmd, user_arg); 781 else 782 r = -ENODEV; 783 mutex_unlock(&hiddev->existancelock); 784 return r; 785 786 case HIDIOCGCOLLECTIONINFO: 787 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) 788 return -EFAULT; 789 790 if (cinfo.index >= hid->maxcollection) 791 return -EINVAL; 792 793 cinfo.type = hid->collection[cinfo.index].type; 794 cinfo.usage = hid->collection[cinfo.index].usage; 795 cinfo.level = hid->collection[cinfo.index].level; 796 797 if (copy_to_user(user_arg, &cinfo, sizeof(cinfo))) 798 return -EFAULT; 799 return 0; 800 801 default: 802 803 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) 804 return -EINVAL; 805 806 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { 807 int len; 808 if (!hid->name) 809 return 0; 810 len = strlen(hid->name) + 1; 811 if (len > _IOC_SIZE(cmd)) 812 len = _IOC_SIZE(cmd); 813 return copy_to_user(user_arg, hid->name, len) ? 814 -EFAULT : len; 815 } 816 817 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { 818 int len; 819 if (!hid->phys) 820 return 0; 821 len = strlen(hid->phys) + 1; 822 if (len > _IOC_SIZE(cmd)) 823 len = _IOC_SIZE(cmd); 824 return copy_to_user(user_arg, hid->phys, len) ? 825 -EFAULT : len; 826 } 827 } 828 return -EINVAL; 829 } 830 831 #ifdef CONFIG_COMPAT 832 static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 833 { 834 return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 835 } 836 #endif 837 838 static const struct file_operations hiddev_fops = { 839 .owner = THIS_MODULE, 840 .read = hiddev_read, 841 .write = hiddev_write, 842 .poll = hiddev_poll, 843 .open = hiddev_open, 844 .release = hiddev_release, 845 .unlocked_ioctl = hiddev_ioctl, 846 .fasync = hiddev_fasync, 847 #ifdef CONFIG_COMPAT 848 .compat_ioctl = hiddev_compat_ioctl, 849 #endif 850 }; 851 852 static char *hiddev_devnode(struct device *dev, mode_t *mode) 853 { 854 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 855 } 856 857 static struct usb_class_driver hiddev_class = { 858 .name = "hiddev%d", 859 .devnode = hiddev_devnode, 860 .fops = &hiddev_fops, 861 .minor_base = HIDDEV_MINOR_BASE, 862 }; 863 864 /* 865 * This is where hid.c calls us to connect a hid device to the hiddev driver 866 */ 867 int hiddev_connect(struct hid_device *hid, unsigned int force) 868 { 869 struct hiddev *hiddev; 870 struct usbhid_device *usbhid = hid->driver_data; 871 int retval; 872 873 if (!force) { 874 unsigned int i; 875 for (i = 0; i < hid->maxcollection; i++) 876 if (hid->collection[i].type == 877 HID_COLLECTION_APPLICATION && 878 !IS_INPUT_APPLICATION(hid->collection[i].usage)) 879 break; 880 881 if (i == hid->maxcollection) 882 return -1; 883 } 884 885 if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) 886 return -1; 887 888 init_waitqueue_head(&hiddev->wait); 889 INIT_LIST_HEAD(&hiddev->list); 890 spin_lock_init(&hiddev->list_lock); 891 mutex_init(&hiddev->existancelock); 892 hid->hiddev = hiddev; 893 hiddev->hid = hid; 894 hiddev->exist = 1; 895 retval = usb_register_dev(usbhid->intf, &hiddev_class); 896 if (retval) { 897 err_hid("Not able to get a minor for this device."); 898 hid->hiddev = NULL; 899 kfree(hiddev); 900 return -1; 901 } 902 return 0; 903 } 904 905 /* 906 * This is where hid.c calls us to disconnect a hiddev device from the 907 * corresponding hid device (usually because the usb device has disconnected) 908 */ 909 static struct usb_class_driver hiddev_class; 910 void hiddev_disconnect(struct hid_device *hid) 911 { 912 struct hiddev *hiddev = hid->hiddev; 913 struct usbhid_device *usbhid = hid->driver_data; 914 915 mutex_lock(&hiddev->existancelock); 916 hiddev->exist = 0; 917 mutex_unlock(&hiddev->existancelock); 918 919 usb_deregister_dev(usbhid->intf, &hiddev_class); 920 921 if (hiddev->open) { 922 usbhid_close(hiddev->hid); 923 wake_up_interruptible(&hiddev->wait); 924 } else { 925 kfree(hiddev); 926 } 927 } 928 929 /* Currently this driver is a USB driver. It's not a conventional one in 930 * the sense that it doesn't probe at the USB level. Instead it waits to 931 * be connected by HID through the hiddev_connect / hiddev_disconnect 932 * routines. The reason to register as a USB device is to gain part of the 933 * minor number space from the USB major. 934 * 935 * In theory, should the HID code be generalized to more than one physical 936 * medium (say, IEEE 1384), this driver will probably need to register its 937 * own major number, and in doing so, no longer need to register with USB. 938 * At that point the probe routine and hiddev_driver struct below will no 939 * longer be useful. 940 */ 941 942 943 /* We never attach in this manner, and rely on HID to connect us. This 944 * is why there is no disconnect routine defined in the usb_driver either. 945 */ 946 static int hiddev_usbd_probe(struct usb_interface *intf, 947 const struct usb_device_id *hiddev_info) 948 { 949 return -ENODEV; 950 } 951 952 static /* const */ struct usb_driver hiddev_driver = { 953 .name = "hiddev", 954 .probe = hiddev_usbd_probe, 955 }; 956 957 int __init hiddev_init(void) 958 { 959 return usb_register(&hiddev_driver); 960 } 961 962 void hiddev_exit(void) 963 { 964 usb_deregister(&hiddev_driver); 965 } 966