1/* 2 * User-space I/O driver support for HID subsystem 3 * Copyright (c) 2012 David Herrmann 4 */ 5 6/* 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the Free 9 * Software Foundation; either version 2 of the License, or (at your option) 10 * any later version. 11 */ 12 13#include <linux/atomic.h> 14#include <linux/compat.h> 15#include <linux/device.h> 16#include <linux/fs.h> 17#include <linux/hid.h> 18#include <linux/input.h> 19#include <linux/miscdevice.h> 20#include <linux/module.h> 21#include <linux/mutex.h> 22#include <linux/poll.h> 23#include <linux/sched.h> 24#include <linux/spinlock.h> 25#include <linux/uhid.h> 26#include <linux/wait.h> 27 28#define UHID_NAME "uhid" 29#define UHID_BUFSIZE 32 30 31struct uhid_device { 32 struct mutex devlock; 33 bool running; 34 35 __u8 *rd_data; 36 uint rd_size; 37 38 struct hid_device *hid; 39 struct uhid_event input_buf; 40 41 wait_queue_head_t waitq; 42 spinlock_t qlock; 43 __u8 head; 44 __u8 tail; 45 struct uhid_event *outq[UHID_BUFSIZE]; 46 47 /* blocking GET_REPORT support; state changes protected by qlock */ 48 struct mutex report_lock; 49 wait_queue_head_t report_wait; 50 bool report_running; 51 u32 report_id; 52 u32 report_type; 53 struct uhid_event report_buf; 54}; 55 56static struct miscdevice uhid_misc; 57 58static void uhid_queue(struct uhid_device *uhid, struct uhid_event *ev) 59{ 60 __u8 newhead; 61 62 newhead = (uhid->head + 1) % UHID_BUFSIZE; 63 64 if (newhead != uhid->tail) { 65 uhid->outq[uhid->head] = ev; 66 uhid->head = newhead; 67 wake_up_interruptible(&uhid->waitq); 68 } else { 69 hid_warn(uhid->hid, "Output queue is full\n"); 70 kfree(ev); 71 } 72} 73 74static int uhid_queue_event(struct uhid_device *uhid, __u32 event) 75{ 76 unsigned long flags; 77 struct uhid_event *ev; 78 79 ev = kzalloc(sizeof(*ev), GFP_KERNEL); 80 if (!ev) 81 return -ENOMEM; 82 83 ev->type = event; 84 85 spin_lock_irqsave(&uhid->qlock, flags); 86 uhid_queue(uhid, ev); 87 spin_unlock_irqrestore(&uhid->qlock, flags); 88 89 return 0; 90} 91 92static int uhid_hid_start(struct hid_device *hid) 93{ 94 struct uhid_device *uhid = hid->driver_data; 95 struct uhid_event *ev; 96 unsigned long flags; 97 98 ev = kzalloc(sizeof(*ev), GFP_KERNEL); 99 if (!ev) 100 return -ENOMEM; 101 102 ev->type = UHID_START; 103 104 if (hid->report_enum[HID_FEATURE_REPORT].numbered) 105 ev->u.start.dev_flags |= UHID_DEV_NUMBERED_FEATURE_REPORTS; 106 if (hid->report_enum[HID_OUTPUT_REPORT].numbered) 107 ev->u.start.dev_flags |= UHID_DEV_NUMBERED_OUTPUT_REPORTS; 108 if (hid->report_enum[HID_INPUT_REPORT].numbered) 109 ev->u.start.dev_flags |= UHID_DEV_NUMBERED_INPUT_REPORTS; 110 111 spin_lock_irqsave(&uhid->qlock, flags); 112 uhid_queue(uhid, ev); 113 spin_unlock_irqrestore(&uhid->qlock, flags); 114 115 return 0; 116} 117 118static void uhid_hid_stop(struct hid_device *hid) 119{ 120 struct uhid_device *uhid = hid->driver_data; 121 122 hid->claimed = 0; 123 uhid_queue_event(uhid, UHID_STOP); 124} 125 126static int uhid_hid_open(struct hid_device *hid) 127{ 128 struct uhid_device *uhid = hid->driver_data; 129 130 return uhid_queue_event(uhid, UHID_OPEN); 131} 132 133static void uhid_hid_close(struct hid_device *hid) 134{ 135 struct uhid_device *uhid = hid->driver_data; 136 137 uhid_queue_event(uhid, UHID_CLOSE); 138} 139 140static int uhid_hid_parse(struct hid_device *hid) 141{ 142 struct uhid_device *uhid = hid->driver_data; 143 144 return hid_parse_report(hid, uhid->rd_data, uhid->rd_size); 145} 146 147/* must be called with report_lock held */ 148static int __uhid_report_queue_and_wait(struct uhid_device *uhid, 149 struct uhid_event *ev, 150 __u32 *report_id) 151{ 152 unsigned long flags; 153 int ret; 154 155 spin_lock_irqsave(&uhid->qlock, flags); 156 *report_id = ++uhid->report_id; 157 uhid->report_type = ev->type + 1; 158 uhid->report_running = true; 159 uhid_queue(uhid, ev); 160 spin_unlock_irqrestore(&uhid->qlock, flags); 161 162 ret = wait_event_interruptible_timeout(uhid->report_wait, 163 !uhid->report_running || !uhid->running, 164 5 * HZ); 165 if (!ret || !uhid->running || uhid->report_running) 166 ret = -EIO; 167 else if (ret < 0) 168 ret = -ERESTARTSYS; 169 else 170 ret = 0; 171 172 uhid->report_running = false; 173 174 return ret; 175} 176 177static void uhid_report_wake_up(struct uhid_device *uhid, u32 id, 178 const struct uhid_event *ev) 179{ 180 unsigned long flags; 181 182 spin_lock_irqsave(&uhid->qlock, flags); 183 184 /* id for old report; drop it silently */ 185 if (uhid->report_type != ev->type || uhid->report_id != id) 186 goto unlock; 187 if (!uhid->report_running) 188 goto unlock; 189 190 memcpy(&uhid->report_buf, ev, sizeof(*ev)); 191 uhid->report_running = false; 192 wake_up_interruptible(&uhid->report_wait); 193 194unlock: 195 spin_unlock_irqrestore(&uhid->qlock, flags); 196} 197 198static int uhid_hid_get_report(struct hid_device *hid, unsigned char rnum, 199 u8 *buf, size_t count, u8 rtype) 200{ 201 struct uhid_device *uhid = hid->driver_data; 202 struct uhid_get_report_reply_req *req; 203 struct uhid_event *ev; 204 int ret; 205 206 if (!uhid->running) 207 return -EIO; 208 209 ev = kzalloc(sizeof(*ev), GFP_KERNEL); 210 if (!ev) 211 return -ENOMEM; 212 213 ev->type = UHID_GET_REPORT; 214 ev->u.get_report.rnum = rnum; 215 ev->u.get_report.rtype = rtype; 216 217 ret = mutex_lock_interruptible(&uhid->report_lock); 218 if (ret) { 219 kfree(ev); 220 return ret; 221 } 222 223 /* this _always_ takes ownership of @ev */ 224 ret = __uhid_report_queue_and_wait(uhid, ev, &ev->u.get_report.id); 225 if (ret) 226 goto unlock; 227 228 req = &uhid->report_buf.u.get_report_reply; 229 if (req->err) { 230 ret = -EIO; 231 } else { 232 ret = min3(count, (size_t)req->size, (size_t)UHID_DATA_MAX); 233 memcpy(buf, req->data, ret); 234 } 235 236unlock: 237 mutex_unlock(&uhid->report_lock); 238 return ret; 239} 240 241static int uhid_hid_set_report(struct hid_device *hid, unsigned char rnum, 242 const u8 *buf, size_t count, u8 rtype) 243{ 244 struct uhid_device *uhid = hid->driver_data; 245 struct uhid_event *ev; 246 int ret; 247 248 if (!uhid->running || count > UHID_DATA_MAX) 249 return -EIO; 250 251 ev = kzalloc(sizeof(*ev), GFP_KERNEL); 252 if (!ev) 253 return -ENOMEM; 254 255 ev->type = UHID_SET_REPORT; 256 ev->u.set_report.rnum = rnum; 257 ev->u.set_report.rtype = rtype; 258 ev->u.set_report.size = count; 259 memcpy(ev->u.set_report.data, buf, count); 260 261 ret = mutex_lock_interruptible(&uhid->report_lock); 262 if (ret) { 263 kfree(ev); 264 return ret; 265 } 266 267 /* this _always_ takes ownership of @ev */ 268 ret = __uhid_report_queue_and_wait(uhid, ev, &ev->u.set_report.id); 269 if (ret) 270 goto unlock; 271 272 if (uhid->report_buf.u.set_report_reply.err) 273 ret = -EIO; 274 else 275 ret = count; 276 277unlock: 278 mutex_unlock(&uhid->report_lock); 279 return ret; 280} 281 282static int uhid_hid_raw_request(struct hid_device *hid, unsigned char reportnum, 283 __u8 *buf, size_t len, unsigned char rtype, 284 int reqtype) 285{ 286 u8 u_rtype; 287 288 switch (rtype) { 289 case HID_FEATURE_REPORT: 290 u_rtype = UHID_FEATURE_REPORT; 291 break; 292 case HID_OUTPUT_REPORT: 293 u_rtype = UHID_OUTPUT_REPORT; 294 break; 295 case HID_INPUT_REPORT: 296 u_rtype = UHID_INPUT_REPORT; 297 break; 298 default: 299 return -EINVAL; 300 } 301 302 switch (reqtype) { 303 case HID_REQ_GET_REPORT: 304 return uhid_hid_get_report(hid, reportnum, buf, len, u_rtype); 305 case HID_REQ_SET_REPORT: 306 return uhid_hid_set_report(hid, reportnum, buf, len, u_rtype); 307 default: 308 return -EIO; 309 } 310} 311 312static int uhid_hid_output_raw(struct hid_device *hid, __u8 *buf, size_t count, 313 unsigned char report_type) 314{ 315 struct uhid_device *uhid = hid->driver_data; 316 __u8 rtype; 317 unsigned long flags; 318 struct uhid_event *ev; 319 320 switch (report_type) { 321 case HID_FEATURE_REPORT: 322 rtype = UHID_FEATURE_REPORT; 323 break; 324 case HID_OUTPUT_REPORT: 325 rtype = UHID_OUTPUT_REPORT; 326 break; 327 default: 328 return -EINVAL; 329 } 330 331 if (count < 1 || count > UHID_DATA_MAX) 332 return -EINVAL; 333 334 ev = kzalloc(sizeof(*ev), GFP_KERNEL); 335 if (!ev) 336 return -ENOMEM; 337 338 ev->type = UHID_OUTPUT; 339 ev->u.output.size = count; 340 ev->u.output.rtype = rtype; 341 memcpy(ev->u.output.data, buf, count); 342 343 spin_lock_irqsave(&uhid->qlock, flags); 344 uhid_queue(uhid, ev); 345 spin_unlock_irqrestore(&uhid->qlock, flags); 346 347 return count; 348} 349 350static int uhid_hid_output_report(struct hid_device *hid, __u8 *buf, 351 size_t count) 352{ 353 return uhid_hid_output_raw(hid, buf, count, HID_OUTPUT_REPORT); 354} 355 356static struct hid_ll_driver uhid_hid_driver = { 357 .start = uhid_hid_start, 358 .stop = uhid_hid_stop, 359 .open = uhid_hid_open, 360 .close = uhid_hid_close, 361 .parse = uhid_hid_parse, 362 .raw_request = uhid_hid_raw_request, 363 .output_report = uhid_hid_output_report, 364}; 365 366#ifdef CONFIG_COMPAT 367 368/* Apparently we haven't stepped on these rakes enough times yet. */ 369struct uhid_create_req_compat { 370 __u8 name[128]; 371 __u8 phys[64]; 372 __u8 uniq[64]; 373 374 compat_uptr_t rd_data; 375 __u16 rd_size; 376 377 __u16 bus; 378 __u32 vendor; 379 __u32 product; 380 __u32 version; 381 __u32 country; 382} __attribute__((__packed__)); 383 384static int uhid_event_from_user(const char __user *buffer, size_t len, 385 struct uhid_event *event) 386{ 387 if (is_compat_task()) { 388 u32 type; 389 390 if (get_user(type, buffer)) 391 return -EFAULT; 392 393 if (type == UHID_CREATE) { 394 /* 395 * This is our messed up request with compat pointer. 396 * It is largish (more than 256 bytes) so we better 397 * allocate it from the heap. 398 */ 399 struct uhid_create_req_compat *compat; 400 401 compat = kzalloc(sizeof(*compat), GFP_KERNEL); 402 if (!compat) 403 return -ENOMEM; 404 405 buffer += sizeof(type); 406 len -= sizeof(type); 407 if (copy_from_user(compat, buffer, 408 min(len, sizeof(*compat)))) { 409 kfree(compat); 410 return -EFAULT; 411 } 412 413 /* Shuffle the data over to proper structure */ 414 event->type = type; 415 416 memcpy(event->u.create.name, compat->name, 417 sizeof(compat->name)); 418 memcpy(event->u.create.phys, compat->phys, 419 sizeof(compat->phys)); 420 memcpy(event->u.create.uniq, compat->uniq, 421 sizeof(compat->uniq)); 422 423 event->u.create.rd_data = compat_ptr(compat->rd_data); 424 event->u.create.rd_size = compat->rd_size; 425 426 event->u.create.bus = compat->bus; 427 event->u.create.vendor = compat->vendor; 428 event->u.create.product = compat->product; 429 event->u.create.version = compat->version; 430 event->u.create.country = compat->country; 431 432 kfree(compat); 433 return 0; 434 } 435 /* All others can be copied directly */ 436 } 437 438 if (copy_from_user(event, buffer, min(len, sizeof(*event)))) 439 return -EFAULT; 440 441 return 0; 442} 443#else 444static int uhid_event_from_user(const char __user *buffer, size_t len, 445 struct uhid_event *event) 446{ 447 if (copy_from_user(event, buffer, min(len, sizeof(*event)))) 448 return -EFAULT; 449 450 return 0; 451} 452#endif 453 454static int uhid_dev_create2(struct uhid_device *uhid, 455 const struct uhid_event *ev) 456{ 457 struct hid_device *hid; 458 size_t rd_size, len; 459 void *rd_data; 460 int ret; 461 462 if (uhid->running) 463 return -EALREADY; 464 465 rd_size = ev->u.create2.rd_size; 466 if (rd_size <= 0 || rd_size > HID_MAX_DESCRIPTOR_SIZE) 467 return -EINVAL; 468 469 rd_data = kmemdup(ev->u.create2.rd_data, rd_size, GFP_KERNEL); 470 if (!rd_data) 471 return -ENOMEM; 472 473 uhid->rd_size = rd_size; 474 uhid->rd_data = rd_data; 475 476 hid = hid_allocate_device(); 477 if (IS_ERR(hid)) { 478 ret = PTR_ERR(hid); 479 goto err_free; 480 } 481 482 len = min(sizeof(hid->name), sizeof(ev->u.create2.name)) - 1; 483 strncpy(hid->name, ev->u.create2.name, len); 484 len = min(sizeof(hid->phys), sizeof(ev->u.create2.phys)) - 1; 485 strncpy(hid->phys, ev->u.create2.phys, len); 486 len = min(sizeof(hid->uniq), sizeof(ev->u.create2.uniq)) - 1; 487 strncpy(hid->uniq, ev->u.create2.uniq, len); 488 489 hid->ll_driver = &uhid_hid_driver; 490 hid->bus = ev->u.create2.bus; 491 hid->vendor = ev->u.create2.vendor; 492 hid->product = ev->u.create2.product; 493 hid->version = ev->u.create2.version; 494 hid->country = ev->u.create2.country; 495 hid->driver_data = uhid; 496 hid->dev.parent = uhid_misc.this_device; 497 498 uhid->hid = hid; 499 uhid->running = true; 500 501 ret = hid_add_device(hid); 502 if (ret) { 503 hid_err(hid, "Cannot register HID device\n"); 504 goto err_hid; 505 } 506 507 return 0; 508 509err_hid: 510 hid_destroy_device(hid); 511 uhid->hid = NULL; 512 uhid->running = false; 513err_free: 514 kfree(uhid->rd_data); 515 uhid->rd_data = NULL; 516 uhid->rd_size = 0; 517 return ret; 518} 519 520static int uhid_dev_create(struct uhid_device *uhid, 521 struct uhid_event *ev) 522{ 523 struct uhid_create_req orig; 524 525 orig = ev->u.create; 526 527 if (orig.rd_size <= 0 || orig.rd_size > HID_MAX_DESCRIPTOR_SIZE) 528 return -EINVAL; 529 if (copy_from_user(&ev->u.create2.rd_data, orig.rd_data, orig.rd_size)) 530 return -EFAULT; 531 532 memcpy(ev->u.create2.name, orig.name, sizeof(orig.name)); 533 memcpy(ev->u.create2.phys, orig.phys, sizeof(orig.phys)); 534 memcpy(ev->u.create2.uniq, orig.uniq, sizeof(orig.uniq)); 535 ev->u.create2.rd_size = orig.rd_size; 536 ev->u.create2.bus = orig.bus; 537 ev->u.create2.vendor = orig.vendor; 538 ev->u.create2.product = orig.product; 539 ev->u.create2.version = orig.version; 540 ev->u.create2.country = orig.country; 541 542 return uhid_dev_create2(uhid, ev); 543} 544 545static int uhid_dev_destroy(struct uhid_device *uhid) 546{ 547 if (!uhid->running) 548 return -EINVAL; 549 550 uhid->running = false; 551 wake_up_interruptible(&uhid->report_wait); 552 553 hid_destroy_device(uhid->hid); 554 kfree(uhid->rd_data); 555 556 return 0; 557} 558 559static int uhid_dev_input(struct uhid_device *uhid, struct uhid_event *ev) 560{ 561 if (!uhid->running) 562 return -EINVAL; 563 564 hid_input_report(uhid->hid, HID_INPUT_REPORT, ev->u.input.data, 565 min_t(size_t, ev->u.input.size, UHID_DATA_MAX), 0); 566 567 return 0; 568} 569 570static int uhid_dev_input2(struct uhid_device *uhid, struct uhid_event *ev) 571{ 572 if (!uhid->running) 573 return -EINVAL; 574 575 hid_input_report(uhid->hid, HID_INPUT_REPORT, ev->u.input2.data, 576 min_t(size_t, ev->u.input2.size, UHID_DATA_MAX), 0); 577 578 return 0; 579} 580 581static int uhid_dev_get_report_reply(struct uhid_device *uhid, 582 struct uhid_event *ev) 583{ 584 if (!uhid->running) 585 return -EINVAL; 586 587 uhid_report_wake_up(uhid, ev->u.get_report_reply.id, ev); 588 return 0; 589} 590 591static int uhid_dev_set_report_reply(struct uhid_device *uhid, 592 struct uhid_event *ev) 593{ 594 if (!uhid->running) 595 return -EINVAL; 596 597 uhid_report_wake_up(uhid, ev->u.set_report_reply.id, ev); 598 return 0; 599} 600 601static int uhid_char_open(struct inode *inode, struct file *file) 602{ 603 struct uhid_device *uhid; 604 605 uhid = kzalloc(sizeof(*uhid), GFP_KERNEL); 606 if (!uhid) 607 return -ENOMEM; 608 609 mutex_init(&uhid->devlock); 610 mutex_init(&uhid->report_lock); 611 spin_lock_init(&uhid->qlock); 612 init_waitqueue_head(&uhid->waitq); 613 init_waitqueue_head(&uhid->report_wait); 614 uhid->running = false; 615 616 file->private_data = uhid; 617 nonseekable_open(inode, file); 618 619 return 0; 620} 621 622static int uhid_char_release(struct inode *inode, struct file *file) 623{ 624 struct uhid_device *uhid = file->private_data; 625 unsigned int i; 626 627 uhid_dev_destroy(uhid); 628 629 for (i = 0; i < UHID_BUFSIZE; ++i) 630 kfree(uhid->outq[i]); 631 632 kfree(uhid); 633 634 return 0; 635} 636 637static ssize_t uhid_char_read(struct file *file, char __user *buffer, 638 size_t count, loff_t *ppos) 639{ 640 struct uhid_device *uhid = file->private_data; 641 int ret; 642 unsigned long flags; 643 size_t len; 644 645 /* they need at least the "type" member of uhid_event */ 646 if (count < sizeof(__u32)) 647 return -EINVAL; 648 649try_again: 650 if (file->f_flags & O_NONBLOCK) { 651 if (uhid->head == uhid->tail) 652 return -EAGAIN; 653 } else { 654 ret = wait_event_interruptible(uhid->waitq, 655 uhid->head != uhid->tail); 656 if (ret) 657 return ret; 658 } 659 660 ret = mutex_lock_interruptible(&uhid->devlock); 661 if (ret) 662 return ret; 663 664 if (uhid->head == uhid->tail) { 665 mutex_unlock(&uhid->devlock); 666 goto try_again; 667 } else { 668 len = min(count, sizeof(**uhid->outq)); 669 if (copy_to_user(buffer, uhid->outq[uhid->tail], len)) { 670 ret = -EFAULT; 671 } else { 672 kfree(uhid->outq[uhid->tail]); 673 uhid->outq[uhid->tail] = NULL; 674 675 spin_lock_irqsave(&uhid->qlock, flags); 676 uhid->tail = (uhid->tail + 1) % UHID_BUFSIZE; 677 spin_unlock_irqrestore(&uhid->qlock, flags); 678 } 679 } 680 681 mutex_unlock(&uhid->devlock); 682 return ret ? ret : len; 683} 684 685static ssize_t uhid_char_write(struct file *file, const char __user *buffer, 686 size_t count, loff_t *ppos) 687{ 688 struct uhid_device *uhid = file->private_data; 689 int ret; 690 size_t len; 691 692 /* we need at least the "type" member of uhid_event */ 693 if (count < sizeof(__u32)) 694 return -EINVAL; 695 696 ret = mutex_lock_interruptible(&uhid->devlock); 697 if (ret) 698 return ret; 699 700 memset(&uhid->input_buf, 0, sizeof(uhid->input_buf)); 701 len = min(count, sizeof(uhid->input_buf)); 702 703 ret = uhid_event_from_user(buffer, len, &uhid->input_buf); 704 if (ret) 705 goto unlock; 706 707 switch (uhid->input_buf.type) { 708 case UHID_CREATE: 709 ret = uhid_dev_create(uhid, &uhid->input_buf); 710 break; 711 case UHID_CREATE2: 712 ret = uhid_dev_create2(uhid, &uhid->input_buf); 713 break; 714 case UHID_DESTROY: 715 ret = uhid_dev_destroy(uhid); 716 break; 717 case UHID_INPUT: 718 ret = uhid_dev_input(uhid, &uhid->input_buf); 719 break; 720 case UHID_INPUT2: 721 ret = uhid_dev_input2(uhid, &uhid->input_buf); 722 break; 723 case UHID_GET_REPORT_REPLY: 724 ret = uhid_dev_get_report_reply(uhid, &uhid->input_buf); 725 break; 726 case UHID_SET_REPORT_REPLY: 727 ret = uhid_dev_set_report_reply(uhid, &uhid->input_buf); 728 break; 729 default: 730 ret = -EOPNOTSUPP; 731 } 732 733unlock: 734 mutex_unlock(&uhid->devlock); 735 736 /* return "count" not "len" to not confuse the caller */ 737 return ret ? ret : count; 738} 739 740static unsigned int uhid_char_poll(struct file *file, poll_table *wait) 741{ 742 struct uhid_device *uhid = file->private_data; 743 744 poll_wait(file, &uhid->waitq, wait); 745 746 if (uhid->head != uhid->tail) 747 return POLLIN | POLLRDNORM; 748 749 return 0; 750} 751 752static const struct file_operations uhid_fops = { 753 .owner = THIS_MODULE, 754 .open = uhid_char_open, 755 .release = uhid_char_release, 756 .read = uhid_char_read, 757 .write = uhid_char_write, 758 .poll = uhid_char_poll, 759 .llseek = no_llseek, 760}; 761 762static struct miscdevice uhid_misc = { 763 .fops = &uhid_fops, 764 .minor = UHID_MINOR, 765 .name = UHID_NAME, 766}; 767 768static int __init uhid_init(void) 769{ 770 return misc_register(&uhid_misc); 771} 772 773static void __exit uhid_exit(void) 774{ 775 misc_deregister(&uhid_misc); 776} 777 778module_init(uhid_init); 779module_exit(uhid_exit); 780MODULE_LICENSE("GPL"); 781MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>"); 782MODULE_DESCRIPTION("User-space I/O driver support for HID subsystem"); 783MODULE_ALIAS_MISCDEV(UHID_MINOR); 784MODULE_ALIAS("devname:" UHID_NAME); 785