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 hiddev *hiddev_table[HIDDEV_MINORS]; 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 int res; 269 270 int i = iminor(inode) - HIDDEV_MINOR_BASE; 271 272 if (i >= HIDDEV_MINORS || i < 0 || !hiddev_table[i]) 273 return -ENODEV; 274 275 if (!(list = kzalloc(sizeof(struct hiddev_list), GFP_KERNEL))) 276 return -ENOMEM; 277 mutex_init(&list->thread_lock); 278 279 list->hiddev = hiddev_table[i]; 280 281 282 file->private_data = list; 283 284 /* 285 * no need for locking because the USB major number 286 * is shared which usbcore guards against disconnect 287 */ 288 if (list->hiddev->exist) { 289 if (!list->hiddev->open++) { 290 res = usbhid_open(hiddev_table[i]->hid); 291 if (res < 0) { 292 res = -EIO; 293 goto bail; 294 } 295 } 296 } else { 297 res = -ENODEV; 298 goto bail; 299 } 300 301 spin_lock_irq(&list->hiddev->list_lock); 302 list_add_tail(&list->node, &hiddev_table[i]->list); 303 spin_unlock_irq(&list->hiddev->list_lock); 304 305 if (!list->hiddev->open++) 306 if (list->hiddev->exist) { 307 struct hid_device *hid = hiddev_table[i]->hid; 308 res = usbhid_get_power(hid); 309 if (res < 0) { 310 res = -EIO; 311 goto bail; 312 } 313 usbhid_open(hid); 314 } 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 lock_kernel(); 454 uref = &uref_multi->uref; 455 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { 456 if (copy_from_user(uref_multi, user_arg, 457 sizeof(*uref_multi))) 458 goto fault; 459 } else { 460 if (copy_from_user(uref, user_arg, sizeof(*uref))) 461 goto fault; 462 } 463 464 switch (cmd) { 465 case HIDIOCGUCODE: 466 rinfo.report_type = uref->report_type; 467 rinfo.report_id = uref->report_id; 468 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 469 goto inval; 470 471 if (uref->field_index >= report->maxfield) 472 goto inval; 473 474 field = report->field[uref->field_index]; 475 if (uref->usage_index >= field->maxusage) 476 goto inval; 477 478 uref->usage_code = field->usage[uref->usage_index].hid; 479 480 if (copy_to_user(user_arg, uref, sizeof(*uref))) 481 goto fault; 482 483 goto goodreturn; 484 485 default: 486 if (cmd != HIDIOCGUSAGE && 487 cmd != HIDIOCGUSAGES && 488 uref->report_type == HID_REPORT_TYPE_INPUT) 489 goto inval; 490 491 if (uref->report_id == HID_REPORT_ID_UNKNOWN) { 492 field = hiddev_lookup_usage(hid, uref); 493 if (field == NULL) 494 goto inval; 495 } else { 496 rinfo.report_type = uref->report_type; 497 rinfo.report_id = uref->report_id; 498 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 499 goto inval; 500 501 if (uref->field_index >= report->maxfield) 502 goto inval; 503 504 field = report->field[uref->field_index]; 505 506 if (cmd == HIDIOCGCOLLECTIONINDEX) { 507 if (uref->usage_index >= field->maxusage) 508 goto inval; 509 } else if (uref->usage_index >= field->report_count) 510 goto inval; 511 512 else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) && 513 (uref_multi->num_values > HID_MAX_MULTI_USAGES || 514 uref->usage_index + uref_multi->num_values > field->report_count)) 515 goto inval; 516 } 517 518 switch (cmd) { 519 case HIDIOCGUSAGE: 520 uref->value = field->value[uref->usage_index]; 521 if (copy_to_user(user_arg, uref, sizeof(*uref))) 522 goto fault; 523 goto goodreturn; 524 525 case HIDIOCSUSAGE: 526 field->value[uref->usage_index] = uref->value; 527 goto goodreturn; 528 529 case HIDIOCGCOLLECTIONINDEX: 530 i = field->usage[uref->usage_index].collection_index; 531 unlock_kernel(); 532 kfree(uref_multi); 533 return i; 534 case HIDIOCGUSAGES: 535 for (i = 0; i < uref_multi->num_values; i++) 536 uref_multi->values[i] = 537 field->value[uref->usage_index + i]; 538 if (copy_to_user(user_arg, uref_multi, 539 sizeof(*uref_multi))) 540 goto fault; 541 goto goodreturn; 542 case HIDIOCSUSAGES: 543 for (i = 0; i < uref_multi->num_values; i++) 544 field->value[uref->usage_index + i] = 545 uref_multi->values[i]; 546 goto goodreturn; 547 } 548 549 goodreturn: 550 unlock_kernel(); 551 kfree(uref_multi); 552 return 0; 553 fault: 554 unlock_kernel(); 555 kfree(uref_multi); 556 return -EFAULT; 557 inval: 558 unlock_kernel(); 559 kfree(uref_multi); 560 return -EINVAL; 561 } 562 } 563 564 static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) 565 { 566 struct hid_device *hid = hiddev->hid; 567 struct usb_device *dev = hid_to_usb_dev(hid); 568 int idx, len; 569 char *buf; 570 571 if (get_user(idx, (int __user *)user_arg)) 572 return -EFAULT; 573 574 if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) 575 return -ENOMEM; 576 577 if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) { 578 kfree(buf); 579 return -EINVAL; 580 } 581 582 if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { 583 kfree(buf); 584 return -EFAULT; 585 } 586 587 kfree(buf); 588 589 return len; 590 } 591 592 static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 593 { 594 struct hiddev_list *list = file->private_data; 595 struct hiddev *hiddev = list->hiddev; 596 struct hid_device *hid = hiddev->hid; 597 struct usb_device *dev = hid_to_usb_dev(hid); 598 struct hiddev_collection_info cinfo; 599 struct hiddev_report_info rinfo; 600 struct hiddev_field_info finfo; 601 struct hiddev_devinfo dinfo; 602 struct hid_report *report; 603 struct hid_field *field; 604 struct usbhid_device *usbhid = hid->driver_data; 605 void __user *user_arg = (void __user *)arg; 606 int i, r; 607 608 /* Called without BKL by compat methods so no BKL taken */ 609 610 /* FIXME: Who or what stop this racing with a disconnect ?? */ 611 if (!hiddev->exist) 612 return -EIO; 613 614 switch (cmd) { 615 616 case HIDIOCGVERSION: 617 return put_user(HID_VERSION, (int __user *)arg); 618 619 case HIDIOCAPPLICATION: 620 if (arg < 0 || arg >= hid->maxapplication) 621 return -EINVAL; 622 623 for (i = 0; i < hid->maxcollection; i++) 624 if (hid->collection[i].type == 625 HID_COLLECTION_APPLICATION && arg-- == 0) 626 break; 627 628 if (i == hid->maxcollection) 629 return -EINVAL; 630 631 return hid->collection[i].usage; 632 633 case HIDIOCGDEVINFO: 634 dinfo.bustype = BUS_USB; 635 dinfo.busnum = dev->bus->busnum; 636 dinfo.devnum = dev->devnum; 637 dinfo.ifnum = usbhid->ifnum; 638 dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); 639 dinfo.product = le16_to_cpu(dev->descriptor.idProduct); 640 dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); 641 dinfo.num_applications = hid->maxapplication; 642 if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) 643 return -EFAULT; 644 645 return 0; 646 647 case HIDIOCGFLAG: 648 if (put_user(list->flags, (int __user *)arg)) 649 return -EFAULT; 650 651 return 0; 652 653 case HIDIOCSFLAG: 654 { 655 int newflags; 656 if (get_user(newflags, (int __user *)arg)) 657 return -EFAULT; 658 659 if ((newflags & ~HIDDEV_FLAGS) != 0 || 660 ((newflags & HIDDEV_FLAG_REPORT) != 0 && 661 (newflags & HIDDEV_FLAG_UREF) == 0)) 662 return -EINVAL; 663 664 list->flags = newflags; 665 666 return 0; 667 } 668 669 case HIDIOCGSTRING: 670 mutex_lock(&hiddev->existancelock); 671 if (hiddev->exist) 672 r = hiddev_ioctl_string(hiddev, cmd, user_arg); 673 else 674 r = -ENODEV; 675 mutex_unlock(&hiddev->existancelock); 676 return r; 677 678 case HIDIOCINITREPORT: 679 mutex_lock(&hiddev->existancelock); 680 if (!hiddev->exist) { 681 mutex_unlock(&hiddev->existancelock); 682 return -ENODEV; 683 } 684 usbhid_init_reports(hid); 685 mutex_unlock(&hiddev->existancelock); 686 687 return 0; 688 689 case HIDIOCGREPORT: 690 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) 691 return -EFAULT; 692 693 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) 694 return -EINVAL; 695 696 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 697 return -EINVAL; 698 699 mutex_lock(&hiddev->existancelock); 700 if (hiddev->exist) { 701 usbhid_submit_report(hid, report, USB_DIR_IN); 702 usbhid_wait_io(hid); 703 } 704 mutex_unlock(&hiddev->existancelock); 705 706 return 0; 707 708 case HIDIOCSREPORT: 709 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) 710 return -EFAULT; 711 712 if (rinfo.report_type == HID_REPORT_TYPE_INPUT) 713 return -EINVAL; 714 715 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 716 return -EINVAL; 717 718 mutex_lock(&hiddev->existancelock); 719 if (hiddev->exist) { 720 usbhid_submit_report(hid, report, USB_DIR_OUT); 721 usbhid_wait_io(hid); 722 } 723 mutex_unlock(&hiddev->existancelock); 724 725 return 0; 726 727 case HIDIOCGREPORTINFO: 728 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) 729 return -EFAULT; 730 731 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 732 return -EINVAL; 733 734 rinfo.num_fields = report->maxfield; 735 736 if (copy_to_user(user_arg, &rinfo, sizeof(rinfo))) 737 return -EFAULT; 738 739 return 0; 740 741 case HIDIOCGFIELDINFO: 742 if (copy_from_user(&finfo, user_arg, sizeof(finfo))) 743 return -EFAULT; 744 rinfo.report_type = finfo.report_type; 745 rinfo.report_id = finfo.report_id; 746 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 747 return -EINVAL; 748 749 if (finfo.field_index >= report->maxfield) 750 return -EINVAL; 751 752 field = report->field[finfo.field_index]; 753 memset(&finfo, 0, sizeof(finfo)); 754 finfo.report_type = rinfo.report_type; 755 finfo.report_id = rinfo.report_id; 756 finfo.field_index = field->report_count - 1; 757 finfo.maxusage = field->maxusage; 758 finfo.flags = field->flags; 759 finfo.physical = field->physical; 760 finfo.logical = field->logical; 761 finfo.application = field->application; 762 finfo.logical_minimum = field->logical_minimum; 763 finfo.logical_maximum = field->logical_maximum; 764 finfo.physical_minimum = field->physical_minimum; 765 finfo.physical_maximum = field->physical_maximum; 766 finfo.unit_exponent = field->unit_exponent; 767 finfo.unit = field->unit; 768 769 if (copy_to_user(user_arg, &finfo, sizeof(finfo))) 770 return -EFAULT; 771 772 return 0; 773 774 case HIDIOCGUCODE: 775 /* fall through */ 776 case HIDIOCGUSAGE: 777 case HIDIOCSUSAGE: 778 case HIDIOCGUSAGES: 779 case HIDIOCSUSAGES: 780 case HIDIOCGCOLLECTIONINDEX: 781 mutex_lock(&hiddev->existancelock); 782 if (hiddev->exist) 783 r = hiddev_ioctl_usage(hiddev, cmd, user_arg); 784 else 785 r = -ENODEV; 786 mutex_unlock(&hiddev->existancelock); 787 return r; 788 789 case HIDIOCGCOLLECTIONINFO: 790 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) 791 return -EFAULT; 792 793 if (cinfo.index >= hid->maxcollection) 794 return -EINVAL; 795 796 cinfo.type = hid->collection[cinfo.index].type; 797 cinfo.usage = hid->collection[cinfo.index].usage; 798 cinfo.level = hid->collection[cinfo.index].level; 799 800 if (copy_to_user(user_arg, &cinfo, sizeof(cinfo))) 801 return -EFAULT; 802 return 0; 803 804 default: 805 806 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) 807 return -EINVAL; 808 809 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { 810 int len; 811 if (!hid->name) 812 return 0; 813 len = strlen(hid->name) + 1; 814 if (len > _IOC_SIZE(cmd)) 815 len = _IOC_SIZE(cmd); 816 return copy_to_user(user_arg, hid->name, len) ? 817 -EFAULT : len; 818 } 819 820 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { 821 int len; 822 if (!hid->phys) 823 return 0; 824 len = strlen(hid->phys) + 1; 825 if (len > _IOC_SIZE(cmd)) 826 len = _IOC_SIZE(cmd); 827 return copy_to_user(user_arg, hid->phys, len) ? 828 -EFAULT : len; 829 } 830 } 831 return -EINVAL; 832 } 833 834 #ifdef CONFIG_COMPAT 835 static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 836 { 837 return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 838 } 839 #endif 840 841 static const struct file_operations hiddev_fops = { 842 .owner = THIS_MODULE, 843 .read = hiddev_read, 844 .write = hiddev_write, 845 .poll = hiddev_poll, 846 .open = hiddev_open, 847 .release = hiddev_release, 848 .unlocked_ioctl = hiddev_ioctl, 849 .fasync = hiddev_fasync, 850 #ifdef CONFIG_COMPAT 851 .compat_ioctl = hiddev_compat_ioctl, 852 #endif 853 }; 854 855 static char *hiddev_devnode(struct device *dev, mode_t *mode) 856 { 857 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 858 } 859 860 static struct usb_class_driver hiddev_class = { 861 .name = "hiddev%d", 862 .devnode = hiddev_devnode, 863 .fops = &hiddev_fops, 864 .minor_base = HIDDEV_MINOR_BASE, 865 }; 866 867 /* 868 * This is where hid.c calls us to connect a hid device to the hiddev driver 869 */ 870 int hiddev_connect(struct hid_device *hid, unsigned int force) 871 { 872 struct hiddev *hiddev; 873 struct usbhid_device *usbhid = hid->driver_data; 874 int retval; 875 876 if (!force) { 877 unsigned int i; 878 for (i = 0; i < hid->maxcollection; i++) 879 if (hid->collection[i].type == 880 HID_COLLECTION_APPLICATION && 881 !IS_INPUT_APPLICATION(hid->collection[i].usage)) 882 break; 883 884 if (i == hid->maxcollection) 885 return -1; 886 } 887 888 if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) 889 return -1; 890 891 init_waitqueue_head(&hiddev->wait); 892 INIT_LIST_HEAD(&hiddev->list); 893 spin_lock_init(&hiddev->list_lock); 894 mutex_init(&hiddev->existancelock); 895 hid->hiddev = hiddev; 896 hiddev->hid = hid; 897 hiddev->exist = 1; 898 899 /* when lock_kernel() usage is fixed in usb_open(), 900 * we could also fix it here */ 901 lock_kernel(); 902 retval = usb_register_dev(usbhid->intf, &hiddev_class); 903 if (retval) { 904 err_hid("Not able to get a minor for this device."); 905 hid->hiddev = NULL; 906 unlock_kernel(); 907 kfree(hiddev); 908 return -1; 909 } else { 910 hid->minor = usbhid->intf->minor; 911 hiddev_table[usbhid->intf->minor - HIDDEV_MINOR_BASE] = hiddev; 912 } 913 unlock_kernel(); 914 915 return 0; 916 } 917 918 /* 919 * This is where hid.c calls us to disconnect a hiddev device from the 920 * corresponding hid device (usually because the usb device has disconnected) 921 */ 922 static struct usb_class_driver hiddev_class; 923 void hiddev_disconnect(struct hid_device *hid) 924 { 925 struct hiddev *hiddev = hid->hiddev; 926 struct usbhid_device *usbhid = hid->driver_data; 927 928 mutex_lock(&hiddev->existancelock); 929 hiddev->exist = 0; 930 mutex_unlock(&hiddev->existancelock); 931 932 hiddev_table[hiddev->hid->minor - HIDDEV_MINOR_BASE] = NULL; 933 usb_deregister_dev(usbhid->intf, &hiddev_class); 934 935 if (hiddev->open) { 936 usbhid_close(hiddev->hid); 937 wake_up_interruptible(&hiddev->wait); 938 } else { 939 kfree(hiddev); 940 } 941 } 942 943 /* Currently this driver is a USB driver. It's not a conventional one in 944 * the sense that it doesn't probe at the USB level. Instead it waits to 945 * be connected by HID through the hiddev_connect / hiddev_disconnect 946 * routines. The reason to register as a USB device is to gain part of the 947 * minor number space from the USB major. 948 * 949 * In theory, should the HID code be generalized to more than one physical 950 * medium (say, IEEE 1384), this driver will probably need to register its 951 * own major number, and in doing so, no longer need to register with USB. 952 * At that point the probe routine and hiddev_driver struct below will no 953 * longer be useful. 954 */ 955 956 957 /* We never attach in this manner, and rely on HID to connect us. This 958 * is why there is no disconnect routine defined in the usb_driver either. 959 */ 960 static int hiddev_usbd_probe(struct usb_interface *intf, 961 const struct usb_device_id *hiddev_info) 962 { 963 return -ENODEV; 964 } 965 966 static /* const */ struct usb_driver hiddev_driver = { 967 .name = "hiddev", 968 .probe = hiddev_usbd_probe, 969 }; 970 971 int __init hiddev_init(void) 972 { 973 return usb_register(&hiddev_driver); 974 } 975 976 void hiddev_exit(void) 977 { 978 usb_deregister(&hiddev_driver); 979 } 980