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 64 48 49 struct hiddev { 50 int exist; 51 int open; 52 wait_queue_head_t wait; 53 struct hid_device *hid; 54 struct list_head list; 55 spinlock_t list_lock; 56 }; 57 58 struct hiddev_list { 59 struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE]; 60 int head; 61 int tail; 62 unsigned flags; 63 struct fasync_struct *fasync; 64 struct hiddev *hiddev; 65 struct list_head node; 66 }; 67 68 static struct hiddev *hiddev_table[HIDDEV_MINORS]; 69 70 /* 71 * Find a report, given the report's type and ID. The ID can be specified 72 * indirectly by REPORT_ID_FIRST (which returns the first report of the given 73 * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the 74 * given type which follows old_id. 75 */ 76 static struct hid_report * 77 hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo) 78 { 79 unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK; 80 unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK; 81 struct hid_report_enum *report_enum; 82 struct hid_report *report; 83 struct list_head *list; 84 85 if (rinfo->report_type < HID_REPORT_TYPE_MIN || 86 rinfo->report_type > HID_REPORT_TYPE_MAX) 87 return NULL; 88 89 report_enum = hid->report_enum + 90 (rinfo->report_type - HID_REPORT_TYPE_MIN); 91 92 switch (flags) { 93 case 0: /* Nothing to do -- report_id is already set correctly */ 94 break; 95 96 case HID_REPORT_ID_FIRST: 97 if (list_empty(&report_enum->report_list)) 98 return NULL; 99 100 list = report_enum->report_list.next; 101 report = list_entry(list, struct hid_report, list); 102 rinfo->report_id = report->id; 103 break; 104 105 case HID_REPORT_ID_NEXT: 106 report = report_enum->report_id_hash[rid]; 107 if (!report) 108 return NULL; 109 110 list = report->list.next; 111 if (list == &report_enum->report_list) 112 return NULL; 113 114 report = list_entry(list, struct hid_report, list); 115 rinfo->report_id = report->id; 116 break; 117 118 default: 119 return NULL; 120 } 121 122 return report_enum->report_id_hash[rinfo->report_id]; 123 } 124 125 /* 126 * Perform an exhaustive search of the report table for a usage, given its 127 * type and usage id. 128 */ 129 static struct hid_field * 130 hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref) 131 { 132 int i, j; 133 struct hid_report *report; 134 struct hid_report_enum *report_enum; 135 struct hid_field *field; 136 137 if (uref->report_type < HID_REPORT_TYPE_MIN || 138 uref->report_type > HID_REPORT_TYPE_MAX) 139 return NULL; 140 141 report_enum = hid->report_enum + 142 (uref->report_type - HID_REPORT_TYPE_MIN); 143 144 list_for_each_entry(report, &report_enum->report_list, list) { 145 for (i = 0; i < report->maxfield; i++) { 146 field = report->field[i]; 147 for (j = 0; j < field->maxusage; j++) { 148 if (field->usage[j].hid == uref->usage_code) { 149 uref->report_id = report->id; 150 uref->field_index = i; 151 uref->usage_index = j; 152 return field; 153 } 154 } 155 } 156 } 157 158 return NULL; 159 } 160 161 static void hiddev_send_event(struct hid_device *hid, 162 struct hiddev_usage_ref *uref) 163 { 164 struct hiddev *hiddev = hid->hiddev; 165 struct hiddev_list *list; 166 unsigned long flags; 167 168 spin_lock_irqsave(&hiddev->list_lock, flags); 169 list_for_each_entry(list, &hiddev->list, node) { 170 if (uref->field_index != HID_FIELD_INDEX_NONE || 171 (list->flags & HIDDEV_FLAG_REPORT) != 0) { 172 list->buffer[list->head] = *uref; 173 list->head = (list->head + 1) & 174 (HIDDEV_BUFFER_SIZE - 1); 175 kill_fasync(&list->fasync, SIGIO, POLL_IN); 176 } 177 } 178 spin_unlock_irqrestore(&hiddev->list_lock, flags); 179 180 wake_up_interruptible(&hiddev->wait); 181 } 182 183 /* 184 * This is where hid.c calls into hiddev to pass an event that occurred over 185 * the interrupt pipe 186 */ 187 void hiddev_hid_event(struct hid_device *hid, struct hid_field *field, 188 struct hid_usage *usage, __s32 value) 189 { 190 unsigned type = field->report_type; 191 struct hiddev_usage_ref uref; 192 193 uref.report_type = 194 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : 195 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : 196 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); 197 uref.report_id = field->report->id; 198 uref.field_index = field->index; 199 uref.usage_index = (usage - field->usage); 200 uref.usage_code = usage->hid; 201 uref.value = value; 202 203 hiddev_send_event(hid, &uref); 204 } 205 EXPORT_SYMBOL_GPL(hiddev_hid_event); 206 207 void hiddev_report_event(struct hid_device *hid, struct hid_report *report) 208 { 209 unsigned type = report->type; 210 struct hiddev_usage_ref uref; 211 212 memset(&uref, 0, sizeof(uref)); 213 uref.report_type = 214 (type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : 215 ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : 216 ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); 217 uref.report_id = report->id; 218 uref.field_index = HID_FIELD_INDEX_NONE; 219 220 hiddev_send_event(hid, &uref); 221 } 222 223 /* 224 * fasync file op 225 */ 226 static int hiddev_fasync(int fd, struct file *file, int on) 227 { 228 int retval; 229 struct hiddev_list *list = file->private_data; 230 231 retval = fasync_helper(fd, file, on, &list->fasync); 232 233 return retval < 0 ? retval : 0; 234 } 235 236 237 /* 238 * release file op 239 */ 240 static int hiddev_release(struct inode * inode, struct file * file) 241 { 242 struct hiddev_list *list = file->private_data; 243 unsigned long flags; 244 245 spin_lock_irqsave(&list->hiddev->list_lock, flags); 246 list_del(&list->node); 247 spin_unlock_irqrestore(&list->hiddev->list_lock, flags); 248 249 if (!--list->hiddev->open) { 250 if (list->hiddev->exist) 251 usbhid_close(list->hiddev->hid); 252 else 253 kfree(list->hiddev); 254 } 255 256 kfree(list); 257 258 return 0; 259 } 260 261 /* 262 * open file op 263 */ 264 static int hiddev_open(struct inode *inode, struct file *file) 265 { 266 struct hiddev_list *list; 267 unsigned long flags; 268 269 int i = iminor(inode) - HIDDEV_MINOR_BASE; 270 271 if (i >= HIDDEV_MINORS || !hiddev_table[i]) 272 return -ENODEV; 273 274 if (!(list = kzalloc(sizeof(struct hiddev_list), GFP_KERNEL))) 275 return -ENOMEM; 276 277 list->hiddev = hiddev_table[i]; 278 279 spin_lock_irqsave(&list->hiddev->list_lock, flags); 280 list_add_tail(&list->node, &hiddev_table[i]->list); 281 spin_unlock_irqrestore(&list->hiddev->list_lock, flags); 282 283 file->private_data = list; 284 285 if (!list->hiddev->open++) 286 if (list->hiddev->exist) 287 usbhid_open(hiddev_table[i]->hid); 288 289 return 0; 290 } 291 292 /* 293 * "write" file op 294 */ 295 static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) 296 { 297 return -EINVAL; 298 } 299 300 /* 301 * "read" file op 302 */ 303 static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) 304 { 305 DECLARE_WAITQUEUE(wait, current); 306 struct hiddev_list *list = file->private_data; 307 int event_size; 308 int retval = 0; 309 310 event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? 311 sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); 312 313 if (count < event_size) 314 return 0; 315 316 while (retval == 0) { 317 if (list->head == list->tail) { 318 add_wait_queue(&list->hiddev->wait, &wait); 319 set_current_state(TASK_INTERRUPTIBLE); 320 321 while (list->head == list->tail) { 322 if (file->f_flags & O_NONBLOCK) { 323 retval = -EAGAIN; 324 break; 325 } 326 if (signal_pending(current)) { 327 retval = -ERESTARTSYS; 328 break; 329 } 330 if (!list->hiddev->exist) { 331 retval = -EIO; 332 break; 333 } 334 335 schedule(); 336 set_current_state(TASK_INTERRUPTIBLE); 337 } 338 339 set_current_state(TASK_RUNNING); 340 remove_wait_queue(&list->hiddev->wait, &wait); 341 } 342 343 if (retval) 344 return retval; 345 346 347 while (list->head != list->tail && 348 retval + event_size <= count) { 349 if ((list->flags & HIDDEV_FLAG_UREF) == 0) { 350 if (list->buffer[list->tail].field_index != 351 HID_FIELD_INDEX_NONE) { 352 struct hiddev_event event; 353 event.hid = list->buffer[list->tail].usage_code; 354 event.value = list->buffer[list->tail].value; 355 if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) 356 return -EFAULT; 357 retval += sizeof(struct hiddev_event); 358 } 359 } else { 360 if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE || 361 (list->flags & HIDDEV_FLAG_REPORT) != 0) { 362 if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) 363 return -EFAULT; 364 retval += sizeof(struct hiddev_usage_ref); 365 } 366 } 367 list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); 368 } 369 370 } 371 372 return retval; 373 } 374 375 /* 376 * "poll" file op 377 * No kernel lock - fine 378 */ 379 static unsigned int hiddev_poll(struct file *file, poll_table *wait) 380 { 381 struct hiddev_list *list = file->private_data; 382 383 poll_wait(file, &list->hiddev->wait, wait); 384 if (list->head != list->tail) 385 return POLLIN | POLLRDNORM; 386 if (!list->hiddev->exist) 387 return POLLERR | POLLHUP; 388 return 0; 389 } 390 391 /* 392 * "ioctl" file op 393 */ 394 static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) 395 { 396 struct hid_device *hid = hiddev->hid; 397 struct hiddev_report_info rinfo; 398 struct hiddev_usage_ref_multi *uref_multi = NULL; 399 struct hiddev_usage_ref *uref; 400 struct hid_report *report; 401 struct hid_field *field; 402 int i; 403 404 uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); 405 if (!uref_multi) 406 return -ENOMEM; 407 lock_kernel(); 408 uref = &uref_multi->uref; 409 if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { 410 if (copy_from_user(uref_multi, user_arg, 411 sizeof(*uref_multi))) 412 goto fault; 413 } else { 414 if (copy_from_user(uref, user_arg, sizeof(*uref))) 415 goto fault; 416 } 417 418 switch (cmd) { 419 case HIDIOCGUCODE: 420 rinfo.report_type = uref->report_type; 421 rinfo.report_id = uref->report_id; 422 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 423 goto inval; 424 425 if (uref->field_index >= report->maxfield) 426 goto inval; 427 428 field = report->field[uref->field_index]; 429 if (uref->usage_index >= field->maxusage) 430 goto inval; 431 432 uref->usage_code = field->usage[uref->usage_index].hid; 433 434 if (copy_to_user(user_arg, uref, sizeof(*uref))) 435 goto fault; 436 437 goto goodreturn; 438 439 default: 440 if (cmd != HIDIOCGUSAGE && 441 cmd != HIDIOCGUSAGES && 442 uref->report_type == HID_REPORT_TYPE_INPUT) 443 goto inval; 444 445 if (uref->report_id == HID_REPORT_ID_UNKNOWN) { 446 field = hiddev_lookup_usage(hid, uref); 447 if (field == NULL) 448 goto inval; 449 } else { 450 rinfo.report_type = uref->report_type; 451 rinfo.report_id = uref->report_id; 452 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 453 goto inval; 454 455 if (uref->field_index >= report->maxfield) 456 goto inval; 457 458 field = report->field[uref->field_index]; 459 460 if (cmd == HIDIOCGCOLLECTIONINDEX) { 461 if (uref->usage_index >= field->maxusage) 462 goto inval; 463 } else if (uref->usage_index >= field->report_count) 464 goto inval; 465 466 else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) && 467 (uref_multi->num_values > HID_MAX_MULTI_USAGES || 468 uref->usage_index + uref_multi->num_values > field->report_count)) 469 goto inval; 470 } 471 472 switch (cmd) { 473 case HIDIOCGUSAGE: 474 uref->value = field->value[uref->usage_index]; 475 if (copy_to_user(user_arg, uref, sizeof(*uref))) 476 goto fault; 477 goto goodreturn; 478 479 case HIDIOCSUSAGE: 480 field->value[uref->usage_index] = uref->value; 481 goto goodreturn; 482 483 case HIDIOCGCOLLECTIONINDEX: 484 kfree(uref_multi); 485 return field->usage[uref->usage_index].collection_index; 486 case HIDIOCGUSAGES: 487 for (i = 0; i < uref_multi->num_values; i++) 488 uref_multi->values[i] = 489 field->value[uref->usage_index + i]; 490 if (copy_to_user(user_arg, uref_multi, 491 sizeof(*uref_multi))) 492 goto fault; 493 goto goodreturn; 494 case HIDIOCSUSAGES: 495 for (i = 0; i < uref_multi->num_values; i++) 496 field->value[uref->usage_index + i] = 497 uref_multi->values[i]; 498 goto goodreturn; 499 } 500 501 goodreturn: 502 unlock_kernel(); 503 kfree(uref_multi); 504 return 0; 505 fault: 506 unlock_kernel(); 507 kfree(uref_multi); 508 return -EFAULT; 509 inval: 510 unlock_kernel(); 511 kfree(uref_multi); 512 return -EINVAL; 513 } 514 } 515 516 static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) 517 { 518 struct hid_device *hid = hiddev->hid; 519 struct usb_device *dev = hid_to_usb_dev(hid); 520 int idx, len; 521 char *buf; 522 523 if (get_user(idx, (int __user *)user_arg)) 524 return -EFAULT; 525 526 if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) 527 return -ENOMEM; 528 529 if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) { 530 kfree(buf); 531 return -EINVAL; 532 } 533 534 if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { 535 kfree(buf); 536 return -EFAULT; 537 } 538 539 kfree(buf); 540 541 return len; 542 } 543 544 static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 545 { 546 struct hiddev_list *list = file->private_data; 547 struct hiddev *hiddev = list->hiddev; 548 struct hid_device *hid = hiddev->hid; 549 struct usb_device *dev = hid_to_usb_dev(hid); 550 struct hiddev_collection_info cinfo; 551 struct hiddev_report_info rinfo; 552 struct hiddev_field_info finfo; 553 struct hiddev_devinfo dinfo; 554 struct hid_report *report; 555 struct hid_field *field; 556 struct usbhid_device *usbhid = hid->driver_data; 557 void __user *user_arg = (void __user *)arg; 558 int i; 559 560 /* Called without BKL by compat methods so no BKL taken */ 561 562 /* FIXME: Who or what stop this racing with a disconnect ?? */ 563 if (!hiddev->exist) 564 return -EIO; 565 566 switch (cmd) { 567 568 case HIDIOCGVERSION: 569 return put_user(HID_VERSION, (int __user *)arg); 570 571 case HIDIOCAPPLICATION: 572 if (arg < 0 || arg >= hid->maxapplication) 573 return -EINVAL; 574 575 for (i = 0; i < hid->maxcollection; i++) 576 if (hid->collection[i].type == 577 HID_COLLECTION_APPLICATION && arg-- == 0) 578 break; 579 580 if (i == hid->maxcollection) 581 return -EINVAL; 582 583 return hid->collection[i].usage; 584 585 case HIDIOCGDEVINFO: 586 dinfo.bustype = BUS_USB; 587 dinfo.busnum = dev->bus->busnum; 588 dinfo.devnum = dev->devnum; 589 dinfo.ifnum = usbhid->ifnum; 590 dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); 591 dinfo.product = le16_to_cpu(dev->descriptor.idProduct); 592 dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); 593 dinfo.num_applications = hid->maxapplication; 594 if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) 595 return -EFAULT; 596 597 return 0; 598 599 case HIDIOCGFLAG: 600 if (put_user(list->flags, (int __user *)arg)) 601 return -EFAULT; 602 603 return 0; 604 605 case HIDIOCSFLAG: 606 { 607 int newflags; 608 if (get_user(newflags, (int __user *)arg)) 609 return -EFAULT; 610 611 if ((newflags & ~HIDDEV_FLAGS) != 0 || 612 ((newflags & HIDDEV_FLAG_REPORT) != 0 && 613 (newflags & HIDDEV_FLAG_UREF) == 0)) 614 return -EINVAL; 615 616 list->flags = newflags; 617 618 return 0; 619 } 620 621 case HIDIOCGSTRING: 622 return hiddev_ioctl_string(hiddev, cmd, user_arg); 623 624 case HIDIOCINITREPORT: 625 usbhid_init_reports(hid); 626 627 return 0; 628 629 case HIDIOCGREPORT: 630 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) 631 return -EFAULT; 632 633 if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) 634 return -EINVAL; 635 636 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 637 return -EINVAL; 638 639 usbhid_submit_report(hid, report, USB_DIR_IN); 640 usbhid_wait_io(hid); 641 642 return 0; 643 644 case HIDIOCSREPORT: 645 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) 646 return -EFAULT; 647 648 if (rinfo.report_type == HID_REPORT_TYPE_INPUT) 649 return -EINVAL; 650 651 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 652 return -EINVAL; 653 654 usbhid_submit_report(hid, report, USB_DIR_OUT); 655 usbhid_wait_io(hid); 656 657 return 0; 658 659 case HIDIOCGREPORTINFO: 660 if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) 661 return -EFAULT; 662 663 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 664 return -EINVAL; 665 666 rinfo.num_fields = report->maxfield; 667 668 if (copy_to_user(user_arg, &rinfo, sizeof(rinfo))) 669 return -EFAULT; 670 671 return 0; 672 673 case HIDIOCGFIELDINFO: 674 if (copy_from_user(&finfo, user_arg, sizeof(finfo))) 675 return -EFAULT; 676 rinfo.report_type = finfo.report_type; 677 rinfo.report_id = finfo.report_id; 678 if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) 679 return -EINVAL; 680 681 if (finfo.field_index >= report->maxfield) 682 return -EINVAL; 683 684 field = report->field[finfo.field_index]; 685 memset(&finfo, 0, sizeof(finfo)); 686 finfo.report_type = rinfo.report_type; 687 finfo.report_id = rinfo.report_id; 688 finfo.field_index = field->report_count - 1; 689 finfo.maxusage = field->maxusage; 690 finfo.flags = field->flags; 691 finfo.physical = field->physical; 692 finfo.logical = field->logical; 693 finfo.application = field->application; 694 finfo.logical_minimum = field->logical_minimum; 695 finfo.logical_maximum = field->logical_maximum; 696 finfo.physical_minimum = field->physical_minimum; 697 finfo.physical_maximum = field->physical_maximum; 698 finfo.unit_exponent = field->unit_exponent; 699 finfo.unit = field->unit; 700 701 if (copy_to_user(user_arg, &finfo, sizeof(finfo))) 702 return -EFAULT; 703 704 return 0; 705 706 case HIDIOCGUCODE: 707 /* fall through */ 708 case HIDIOCGUSAGE: 709 case HIDIOCSUSAGE: 710 case HIDIOCGUSAGES: 711 case HIDIOCSUSAGES: 712 case HIDIOCGCOLLECTIONINDEX: 713 return hiddev_ioctl_usage(hiddev, cmd, user_arg); 714 715 case HIDIOCGCOLLECTIONINFO: 716 if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) 717 return -EFAULT; 718 719 if (cinfo.index >= hid->maxcollection) 720 return -EINVAL; 721 722 cinfo.type = hid->collection[cinfo.index].type; 723 cinfo.usage = hid->collection[cinfo.index].usage; 724 cinfo.level = hid->collection[cinfo.index].level; 725 726 if (copy_to_user(user_arg, &cinfo, sizeof(cinfo))) 727 return -EFAULT; 728 return 0; 729 730 default: 731 732 if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) 733 return -EINVAL; 734 735 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { 736 int len; 737 if (!hid->name) 738 return 0; 739 len = strlen(hid->name) + 1; 740 if (len > _IOC_SIZE(cmd)) 741 len = _IOC_SIZE(cmd); 742 return copy_to_user(user_arg, hid->name, len) ? 743 -EFAULT : len; 744 } 745 746 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { 747 int len; 748 if (!hid->phys) 749 return 0; 750 len = strlen(hid->phys) + 1; 751 if (len > _IOC_SIZE(cmd)) 752 len = _IOC_SIZE(cmd); 753 return copy_to_user(user_arg, hid->phys, len) ? 754 -EFAULT : len; 755 } 756 } 757 return -EINVAL; 758 } 759 760 #ifdef CONFIG_COMPAT 761 static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 762 { 763 return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 764 } 765 #endif 766 767 static const struct file_operations hiddev_fops = { 768 .owner = THIS_MODULE, 769 .read = hiddev_read, 770 .write = hiddev_write, 771 .poll = hiddev_poll, 772 .open = hiddev_open, 773 .release = hiddev_release, 774 .unlocked_ioctl = hiddev_ioctl, 775 .fasync = hiddev_fasync, 776 #ifdef CONFIG_COMPAT 777 .compat_ioctl = hiddev_compat_ioctl, 778 #endif 779 }; 780 781 static struct usb_class_driver hiddev_class = { 782 .name = "hiddev%d", 783 .fops = &hiddev_fops, 784 .minor_base = HIDDEV_MINOR_BASE, 785 }; 786 787 /* 788 * This is where hid.c calls us to connect a hid device to the hiddev driver 789 */ 790 int hiddev_connect(struct hid_device *hid, unsigned int force) 791 { 792 struct hiddev *hiddev; 793 struct usbhid_device *usbhid = hid->driver_data; 794 int retval; 795 796 if (!force) { 797 unsigned int i; 798 for (i = 0; i < hid->maxcollection; i++) 799 if (hid->collection[i].type == 800 HID_COLLECTION_APPLICATION && 801 !IS_INPUT_APPLICATION(hid->collection[i].usage)) 802 break; 803 804 if (i == hid->maxcollection) 805 return -1; 806 } 807 808 if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) 809 return -1; 810 811 retval = usb_register_dev(usbhid->intf, &hiddev_class); 812 if (retval) { 813 err_hid("Not able to get a minor for this device."); 814 kfree(hiddev); 815 return -1; 816 } 817 818 init_waitqueue_head(&hiddev->wait); 819 INIT_LIST_HEAD(&hiddev->list); 820 spin_lock_init(&hiddev->list_lock); 821 hiddev->hid = hid; 822 hiddev->exist = 1; 823 824 hid->minor = usbhid->intf->minor; 825 hid->hiddev = hiddev; 826 827 hiddev_table[usbhid->intf->minor - HIDDEV_MINOR_BASE] = hiddev; 828 829 return 0; 830 } 831 832 /* 833 * This is where hid.c calls us to disconnect a hiddev device from the 834 * corresponding hid device (usually because the usb device has disconnected) 835 */ 836 static struct usb_class_driver hiddev_class; 837 void hiddev_disconnect(struct hid_device *hid) 838 { 839 struct hiddev *hiddev = hid->hiddev; 840 struct usbhid_device *usbhid = hid->driver_data; 841 842 hiddev->exist = 0; 843 844 hiddev_table[hiddev->hid->minor - HIDDEV_MINOR_BASE] = NULL; 845 usb_deregister_dev(usbhid->intf, &hiddev_class); 846 847 if (hiddev->open) { 848 usbhid_close(hiddev->hid); 849 wake_up_interruptible(&hiddev->wait); 850 } else { 851 kfree(hiddev); 852 } 853 } 854 855 /* Currently this driver is a USB driver. It's not a conventional one in 856 * the sense that it doesn't probe at the USB level. Instead it waits to 857 * be connected by HID through the hiddev_connect / hiddev_disconnect 858 * routines. The reason to register as a USB device is to gain part of the 859 * minor number space from the USB major. 860 * 861 * In theory, should the HID code be generalized to more than one physical 862 * medium (say, IEEE 1384), this driver will probably need to register its 863 * own major number, and in doing so, no longer need to register with USB. 864 * At that point the probe routine and hiddev_driver struct below will no 865 * longer be useful. 866 */ 867 868 869 /* We never attach in this manner, and rely on HID to connect us. This 870 * is why there is no disconnect routine defined in the usb_driver either. 871 */ 872 static int hiddev_usbd_probe(struct usb_interface *intf, 873 const struct usb_device_id *hiddev_info) 874 { 875 return -ENODEV; 876 } 877 878 879 static /* const */ struct usb_driver hiddev_driver = { 880 .name = "hiddev", 881 .probe = hiddev_usbd_probe, 882 }; 883 884 int __init hiddev_init(void) 885 { 886 return usb_register(&hiddev_driver); 887 } 888 889 void hiddev_exit(void) 890 { 891 usb_deregister(&hiddev_driver); 892 } 893