1 /*****************************************************************************/ 2 3 /* 4 * devio.c -- User space communication with USB devices. 5 * 6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch) 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 * 22 * This file implements the usbfs/x/y files, where 23 * x is the bus number and y the device number. 24 * 25 * It allows user space programs/"drivers" to communicate directly 26 * with USB devices without intervening kernel driver. 27 * 28 * Revision history 29 * 22.12.1999 0.1 Initial release (split from proc_usb.c) 30 * 04.01.2000 0.2 Turned into its own filesystem 31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery 32 * (CAN-2005-3055) 33 */ 34 35 /*****************************************************************************/ 36 37 #include <linux/fs.h> 38 #include <linux/mm.h> 39 #include <linux/slab.h> 40 #include <linux/smp_lock.h> 41 #include <linux/signal.h> 42 #include <linux/poll.h> 43 #include <linux/module.h> 44 #include <linux/usb.h> 45 #include <linux/usbdevice_fs.h> 46 #include <linux/usb/hcd.h> /* for usbcore internals */ 47 #include <linux/cdev.h> 48 #include <linux/notifier.h> 49 #include <linux/security.h> 50 #include <asm/uaccess.h> 51 #include <asm/byteorder.h> 52 #include <linux/moduleparam.h> 53 54 #include "usb.h" 55 56 #define USB_MAXBUS 64 57 #define USB_DEVICE_MAX USB_MAXBUS * 128 58 59 /* Mutual exclusion for removal, open, and release */ 60 DEFINE_MUTEX(usbfs_mutex); 61 62 struct dev_state { 63 struct list_head list; /* state list */ 64 struct usb_device *dev; 65 struct file *file; 66 spinlock_t lock; /* protects the async urb lists */ 67 struct list_head async_pending; 68 struct list_head async_completed; 69 wait_queue_head_t wait; /* wake up if a request completed */ 70 unsigned int discsignr; 71 struct pid *disc_pid; 72 uid_t disc_uid, disc_euid; 73 void __user *disccontext; 74 unsigned long ifclaimed; 75 u32 secid; 76 u32 disabled_bulk_eps; 77 }; 78 79 struct async { 80 struct list_head asynclist; 81 struct dev_state *ps; 82 struct pid *pid; 83 uid_t uid, euid; 84 unsigned int signr; 85 unsigned int ifnum; 86 void __user *userbuffer; 87 void __user *userurb; 88 struct urb *urb; 89 int status; 90 u32 secid; 91 u8 bulk_addr; 92 u8 bulk_status; 93 }; 94 95 static int usbfs_snoop; 96 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR); 97 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic"); 98 99 #define snoop(dev, format, arg...) \ 100 do { \ 101 if (usbfs_snoop) \ 102 dev_info(dev , format , ## arg); \ 103 } while (0) 104 105 enum snoop_when { 106 SUBMIT, COMPLETE 107 }; 108 109 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0) 110 111 #define MAX_USBFS_BUFFER_SIZE 16384 112 113 114 static int connected(struct dev_state *ps) 115 { 116 return (!list_empty(&ps->list) && 117 ps->dev->state != USB_STATE_NOTATTACHED); 118 } 119 120 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig) 121 { 122 loff_t ret; 123 124 mutex_lock(&file->f_dentry->d_inode->i_mutex); 125 126 switch (orig) { 127 case 0: 128 file->f_pos = offset; 129 ret = file->f_pos; 130 break; 131 case 1: 132 file->f_pos += offset; 133 ret = file->f_pos; 134 break; 135 case 2: 136 default: 137 ret = -EINVAL; 138 } 139 140 mutex_unlock(&file->f_dentry->d_inode->i_mutex); 141 return ret; 142 } 143 144 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, 145 loff_t *ppos) 146 { 147 struct dev_state *ps = file->private_data; 148 struct usb_device *dev = ps->dev; 149 ssize_t ret = 0; 150 unsigned len; 151 loff_t pos; 152 int i; 153 154 pos = *ppos; 155 usb_lock_device(dev); 156 if (!connected(ps)) { 157 ret = -ENODEV; 158 goto err; 159 } else if (pos < 0) { 160 ret = -EINVAL; 161 goto err; 162 } 163 164 if (pos < sizeof(struct usb_device_descriptor)) { 165 /* 18 bytes - fits on the stack */ 166 struct usb_device_descriptor temp_desc; 167 168 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor)); 169 le16_to_cpus(&temp_desc.bcdUSB); 170 le16_to_cpus(&temp_desc.idVendor); 171 le16_to_cpus(&temp_desc.idProduct); 172 le16_to_cpus(&temp_desc.bcdDevice); 173 174 len = sizeof(struct usb_device_descriptor) - pos; 175 if (len > nbytes) 176 len = nbytes; 177 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) { 178 ret = -EFAULT; 179 goto err; 180 } 181 182 *ppos += len; 183 buf += len; 184 nbytes -= len; 185 ret += len; 186 } 187 188 pos = sizeof(struct usb_device_descriptor); 189 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) { 190 struct usb_config_descriptor *config = 191 (struct usb_config_descriptor *)dev->rawdescriptors[i]; 192 unsigned int length = le16_to_cpu(config->wTotalLength); 193 194 if (*ppos < pos + length) { 195 196 /* The descriptor may claim to be longer than it 197 * really is. Here is the actual allocated length. */ 198 unsigned alloclen = 199 le16_to_cpu(dev->config[i].desc.wTotalLength); 200 201 len = length - (*ppos - pos); 202 if (len > nbytes) 203 len = nbytes; 204 205 /* Simply don't write (skip over) unallocated parts */ 206 if (alloclen > (*ppos - pos)) { 207 alloclen -= (*ppos - pos); 208 if (copy_to_user(buf, 209 dev->rawdescriptors[i] + (*ppos - pos), 210 min(len, alloclen))) { 211 ret = -EFAULT; 212 goto err; 213 } 214 } 215 216 *ppos += len; 217 buf += len; 218 nbytes -= len; 219 ret += len; 220 } 221 222 pos += length; 223 } 224 225 err: 226 usb_unlock_device(dev); 227 return ret; 228 } 229 230 /* 231 * async list handling 232 */ 233 234 static struct async *alloc_async(unsigned int numisoframes) 235 { 236 struct async *as; 237 238 as = kzalloc(sizeof(struct async), GFP_KERNEL); 239 if (!as) 240 return NULL; 241 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL); 242 if (!as->urb) { 243 kfree(as); 244 return NULL; 245 } 246 return as; 247 } 248 249 static void free_async(struct async *as) 250 { 251 put_pid(as->pid); 252 kfree(as->urb->transfer_buffer); 253 kfree(as->urb->setup_packet); 254 usb_free_urb(as->urb); 255 kfree(as); 256 } 257 258 static void async_newpending(struct async *as) 259 { 260 struct dev_state *ps = as->ps; 261 unsigned long flags; 262 263 spin_lock_irqsave(&ps->lock, flags); 264 list_add_tail(&as->asynclist, &ps->async_pending); 265 spin_unlock_irqrestore(&ps->lock, flags); 266 } 267 268 static void async_removepending(struct async *as) 269 { 270 struct dev_state *ps = as->ps; 271 unsigned long flags; 272 273 spin_lock_irqsave(&ps->lock, flags); 274 list_del_init(&as->asynclist); 275 spin_unlock_irqrestore(&ps->lock, flags); 276 } 277 278 static struct async *async_getcompleted(struct dev_state *ps) 279 { 280 unsigned long flags; 281 struct async *as = NULL; 282 283 spin_lock_irqsave(&ps->lock, flags); 284 if (!list_empty(&ps->async_completed)) { 285 as = list_entry(ps->async_completed.next, struct async, 286 asynclist); 287 list_del_init(&as->asynclist); 288 } 289 spin_unlock_irqrestore(&ps->lock, flags); 290 return as; 291 } 292 293 static struct async *async_getpending(struct dev_state *ps, 294 void __user *userurb) 295 { 296 unsigned long flags; 297 struct async *as; 298 299 spin_lock_irqsave(&ps->lock, flags); 300 list_for_each_entry(as, &ps->async_pending, asynclist) 301 if (as->userurb == userurb) { 302 list_del_init(&as->asynclist); 303 spin_unlock_irqrestore(&ps->lock, flags); 304 return as; 305 } 306 spin_unlock_irqrestore(&ps->lock, flags); 307 return NULL; 308 } 309 310 static void snoop_urb(struct usb_device *udev, 311 void __user *userurb, int pipe, unsigned length, 312 int timeout_or_status, enum snoop_when when, 313 unsigned char *data, unsigned data_len) 314 { 315 static const char *types[] = {"isoc", "int", "ctrl", "bulk"}; 316 static const char *dirs[] = {"out", "in"}; 317 int ep; 318 const char *t, *d; 319 320 if (!usbfs_snoop) 321 return; 322 323 ep = usb_pipeendpoint(pipe); 324 t = types[usb_pipetype(pipe)]; 325 d = dirs[!!usb_pipein(pipe)]; 326 327 if (userurb) { /* Async */ 328 if (when == SUBMIT) 329 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, " 330 "length %u\n", 331 userurb, ep, t, d, length); 332 else 333 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, " 334 "actual_length %u status %d\n", 335 userurb, ep, t, d, length, 336 timeout_or_status); 337 } else { 338 if (when == SUBMIT) 339 dev_info(&udev->dev, "ep%d %s-%s, length %u, " 340 "timeout %d\n", 341 ep, t, d, length, timeout_or_status); 342 else 343 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, " 344 "status %d\n", 345 ep, t, d, length, timeout_or_status); 346 } 347 348 if (data && data_len > 0) { 349 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1, 350 data, data_len, 1); 351 } 352 } 353 354 #define AS_CONTINUATION 1 355 #define AS_UNLINK 2 356 357 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr) 358 __releases(ps->lock) 359 __acquires(ps->lock) 360 { 361 struct async *as; 362 363 /* Mark all the pending URBs that match bulk_addr, up to but not 364 * including the first one without AS_CONTINUATION. If such an 365 * URB is encountered then a new transfer has already started so 366 * the endpoint doesn't need to be disabled; otherwise it does. 367 */ 368 list_for_each_entry(as, &ps->async_pending, asynclist) { 369 if (as->bulk_addr == bulk_addr) { 370 if (as->bulk_status != AS_CONTINUATION) 371 goto rescan; 372 as->bulk_status = AS_UNLINK; 373 as->bulk_addr = 0; 374 } 375 } 376 ps->disabled_bulk_eps |= (1 << bulk_addr); 377 378 /* Now carefully unlink all the marked pending URBs */ 379 rescan: 380 list_for_each_entry(as, &ps->async_pending, asynclist) { 381 if (as->bulk_status == AS_UNLINK) { 382 as->bulk_status = 0; /* Only once */ 383 spin_unlock(&ps->lock); /* Allow completions */ 384 usb_unlink_urb(as->urb); 385 spin_lock(&ps->lock); 386 goto rescan; 387 } 388 } 389 } 390 391 static void async_completed(struct urb *urb) 392 { 393 struct async *as = urb->context; 394 struct dev_state *ps = as->ps; 395 struct siginfo sinfo; 396 struct pid *pid = NULL; 397 uid_t uid = 0; 398 uid_t euid = 0; 399 u32 secid = 0; 400 int signr; 401 402 spin_lock(&ps->lock); 403 list_move_tail(&as->asynclist, &ps->async_completed); 404 as->status = urb->status; 405 signr = as->signr; 406 if (signr) { 407 sinfo.si_signo = as->signr; 408 sinfo.si_errno = as->status; 409 sinfo.si_code = SI_ASYNCIO; 410 sinfo.si_addr = as->userurb; 411 pid = as->pid; 412 uid = as->uid; 413 euid = as->euid; 414 secid = as->secid; 415 } 416 snoop(&urb->dev->dev, "urb complete\n"); 417 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length, 418 as->status, COMPLETE, 419 ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_OUT) ? 420 NULL : urb->transfer_buffer, urb->actual_length); 421 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET && 422 as->status != -ENOENT) 423 cancel_bulk_urbs(ps, as->bulk_addr); 424 spin_unlock(&ps->lock); 425 426 if (signr) 427 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid, 428 euid, secid); 429 430 wake_up(&ps->wait); 431 } 432 433 static void destroy_async(struct dev_state *ps, struct list_head *list) 434 { 435 struct async *as; 436 unsigned long flags; 437 438 spin_lock_irqsave(&ps->lock, flags); 439 while (!list_empty(list)) { 440 as = list_entry(list->next, struct async, asynclist); 441 list_del_init(&as->asynclist); 442 443 /* drop the spinlock so the completion handler can run */ 444 spin_unlock_irqrestore(&ps->lock, flags); 445 usb_kill_urb(as->urb); 446 spin_lock_irqsave(&ps->lock, flags); 447 } 448 spin_unlock_irqrestore(&ps->lock, flags); 449 } 450 451 static void destroy_async_on_interface(struct dev_state *ps, 452 unsigned int ifnum) 453 { 454 struct list_head *p, *q, hitlist; 455 unsigned long flags; 456 457 INIT_LIST_HEAD(&hitlist); 458 spin_lock_irqsave(&ps->lock, flags); 459 list_for_each_safe(p, q, &ps->async_pending) 460 if (ifnum == list_entry(p, struct async, asynclist)->ifnum) 461 list_move_tail(p, &hitlist); 462 spin_unlock_irqrestore(&ps->lock, flags); 463 destroy_async(ps, &hitlist); 464 } 465 466 static void destroy_all_async(struct dev_state *ps) 467 { 468 destroy_async(ps, &ps->async_pending); 469 } 470 471 /* 472 * interface claims are made only at the request of user level code, 473 * which can also release them (explicitly or by closing files). 474 * they're also undone when devices disconnect. 475 */ 476 477 static int driver_probe(struct usb_interface *intf, 478 const struct usb_device_id *id) 479 { 480 return -ENODEV; 481 } 482 483 static void driver_disconnect(struct usb_interface *intf) 484 { 485 struct dev_state *ps = usb_get_intfdata(intf); 486 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber; 487 488 if (!ps) 489 return; 490 491 /* NOTE: this relies on usbcore having canceled and completed 492 * all pending I/O requests; 2.6 does that. 493 */ 494 495 if (likely(ifnum < 8*sizeof(ps->ifclaimed))) 496 clear_bit(ifnum, &ps->ifclaimed); 497 else 498 dev_warn(&intf->dev, "interface number %u out of range\n", 499 ifnum); 500 501 usb_set_intfdata(intf, NULL); 502 503 /* force async requests to complete */ 504 destroy_async_on_interface(ps, ifnum); 505 } 506 507 /* The following routines are merely placeholders. There is no way 508 * to inform a user task about suspend or resumes. 509 */ 510 static int driver_suspend(struct usb_interface *intf, pm_message_t msg) 511 { 512 return 0; 513 } 514 515 static int driver_resume(struct usb_interface *intf) 516 { 517 return 0; 518 } 519 520 struct usb_driver usbfs_driver = { 521 .name = "usbfs", 522 .probe = driver_probe, 523 .disconnect = driver_disconnect, 524 .suspend = driver_suspend, 525 .resume = driver_resume, 526 }; 527 528 static int claimintf(struct dev_state *ps, unsigned int ifnum) 529 { 530 struct usb_device *dev = ps->dev; 531 struct usb_interface *intf; 532 int err; 533 534 if (ifnum >= 8*sizeof(ps->ifclaimed)) 535 return -EINVAL; 536 /* already claimed */ 537 if (test_bit(ifnum, &ps->ifclaimed)) 538 return 0; 539 540 intf = usb_ifnum_to_if(dev, ifnum); 541 if (!intf) 542 err = -ENOENT; 543 else 544 err = usb_driver_claim_interface(&usbfs_driver, intf, ps); 545 if (err == 0) 546 set_bit(ifnum, &ps->ifclaimed); 547 return err; 548 } 549 550 static int releaseintf(struct dev_state *ps, unsigned int ifnum) 551 { 552 struct usb_device *dev; 553 struct usb_interface *intf; 554 int err; 555 556 err = -EINVAL; 557 if (ifnum >= 8*sizeof(ps->ifclaimed)) 558 return err; 559 dev = ps->dev; 560 intf = usb_ifnum_to_if(dev, ifnum); 561 if (!intf) 562 err = -ENOENT; 563 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) { 564 usb_driver_release_interface(&usbfs_driver, intf); 565 err = 0; 566 } 567 return err; 568 } 569 570 static int checkintf(struct dev_state *ps, unsigned int ifnum) 571 { 572 if (ps->dev->state != USB_STATE_CONFIGURED) 573 return -EHOSTUNREACH; 574 if (ifnum >= 8*sizeof(ps->ifclaimed)) 575 return -EINVAL; 576 if (test_bit(ifnum, &ps->ifclaimed)) 577 return 0; 578 /* if not yet claimed, claim it for the driver */ 579 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim " 580 "interface %u before use\n", task_pid_nr(current), 581 current->comm, ifnum); 582 return claimintf(ps, ifnum); 583 } 584 585 static int findintfep(struct usb_device *dev, unsigned int ep) 586 { 587 unsigned int i, j, e; 588 struct usb_interface *intf; 589 struct usb_host_interface *alts; 590 struct usb_endpoint_descriptor *endpt; 591 592 if (ep & ~(USB_DIR_IN|0xf)) 593 return -EINVAL; 594 if (!dev->actconfig) 595 return -ESRCH; 596 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { 597 intf = dev->actconfig->interface[i]; 598 for (j = 0; j < intf->num_altsetting; j++) { 599 alts = &intf->altsetting[j]; 600 for (e = 0; e < alts->desc.bNumEndpoints; e++) { 601 endpt = &alts->endpoint[e].desc; 602 if (endpt->bEndpointAddress == ep) 603 return alts->desc.bInterfaceNumber; 604 } 605 } 606 } 607 return -ENOENT; 608 } 609 610 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, 611 unsigned int index) 612 { 613 int ret = 0; 614 615 if (ps->dev->state != USB_STATE_UNAUTHENTICATED 616 && ps->dev->state != USB_STATE_ADDRESS 617 && ps->dev->state != USB_STATE_CONFIGURED) 618 return -EHOSTUNREACH; 619 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype)) 620 return 0; 621 622 index &= 0xff; 623 switch (requesttype & USB_RECIP_MASK) { 624 case USB_RECIP_ENDPOINT: 625 ret = findintfep(ps->dev, index); 626 if (ret >= 0) 627 ret = checkintf(ps, ret); 628 break; 629 630 case USB_RECIP_INTERFACE: 631 ret = checkintf(ps, index); 632 break; 633 } 634 return ret; 635 } 636 637 static int match_devt(struct device *dev, void *data) 638 { 639 return dev->devt == (dev_t) (unsigned long) data; 640 } 641 642 static struct usb_device *usbdev_lookup_by_devt(dev_t devt) 643 { 644 struct device *dev; 645 646 dev = bus_find_device(&usb_bus_type, NULL, 647 (void *) (unsigned long) devt, match_devt); 648 if (!dev) 649 return NULL; 650 return container_of(dev, struct usb_device, dev); 651 } 652 653 /* 654 * file operations 655 */ 656 static int usbdev_open(struct inode *inode, struct file *file) 657 { 658 struct usb_device *dev = NULL; 659 struct dev_state *ps; 660 const struct cred *cred = current_cred(); 661 int ret; 662 663 ret = -ENOMEM; 664 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL); 665 if (!ps) 666 goto out_free_ps; 667 668 ret = -ENODEV; 669 670 /* Protect against simultaneous removal or release */ 671 mutex_lock(&usbfs_mutex); 672 673 /* usbdev device-node */ 674 if (imajor(inode) == USB_DEVICE_MAJOR) 675 dev = usbdev_lookup_by_devt(inode->i_rdev); 676 677 #ifdef CONFIG_USB_DEVICEFS 678 /* procfs file */ 679 if (!dev) { 680 dev = inode->i_private; 681 if (dev && dev->usbfs_dentry && 682 dev->usbfs_dentry->d_inode == inode) 683 usb_get_dev(dev); 684 else 685 dev = NULL; 686 } 687 #endif 688 mutex_unlock(&usbfs_mutex); 689 690 if (!dev) 691 goto out_free_ps; 692 693 usb_lock_device(dev); 694 if (dev->state == USB_STATE_NOTATTACHED) 695 goto out_unlock_device; 696 697 ret = usb_autoresume_device(dev); 698 if (ret) 699 goto out_unlock_device; 700 701 ps->dev = dev; 702 ps->file = file; 703 spin_lock_init(&ps->lock); 704 INIT_LIST_HEAD(&ps->list); 705 INIT_LIST_HEAD(&ps->async_pending); 706 INIT_LIST_HEAD(&ps->async_completed); 707 init_waitqueue_head(&ps->wait); 708 ps->discsignr = 0; 709 ps->disc_pid = get_pid(task_pid(current)); 710 ps->disc_uid = cred->uid; 711 ps->disc_euid = cred->euid; 712 ps->disccontext = NULL; 713 ps->ifclaimed = 0; 714 security_task_getsecid(current, &ps->secid); 715 smp_wmb(); 716 list_add_tail(&ps->list, &dev->filelist); 717 file->private_data = ps; 718 usb_unlock_device(dev); 719 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current), 720 current->comm); 721 return ret; 722 723 out_unlock_device: 724 usb_unlock_device(dev); 725 usb_put_dev(dev); 726 out_free_ps: 727 kfree(ps); 728 return ret; 729 } 730 731 static int usbdev_release(struct inode *inode, struct file *file) 732 { 733 struct dev_state *ps = file->private_data; 734 struct usb_device *dev = ps->dev; 735 unsigned int ifnum; 736 struct async *as; 737 738 usb_lock_device(dev); 739 usb_hub_release_all_ports(dev, ps); 740 741 list_del_init(&ps->list); 742 743 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed); 744 ifnum++) { 745 if (test_bit(ifnum, &ps->ifclaimed)) 746 releaseintf(ps, ifnum); 747 } 748 destroy_all_async(ps); 749 usb_autosuspend_device(dev); 750 usb_unlock_device(dev); 751 usb_put_dev(dev); 752 put_pid(ps->disc_pid); 753 754 as = async_getcompleted(ps); 755 while (as) { 756 free_async(as); 757 as = async_getcompleted(ps); 758 } 759 kfree(ps); 760 return 0; 761 } 762 763 static int proc_control(struct dev_state *ps, void __user *arg) 764 { 765 struct usb_device *dev = ps->dev; 766 struct usbdevfs_ctrltransfer ctrl; 767 unsigned int tmo; 768 unsigned char *tbuf; 769 unsigned wLength; 770 int i, pipe, ret; 771 772 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 773 return -EFAULT; 774 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex); 775 if (ret) 776 return ret; 777 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */ 778 if (wLength > PAGE_SIZE) 779 return -EINVAL; 780 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL); 781 if (!tbuf) 782 return -ENOMEM; 783 tmo = ctrl.timeout; 784 snoop(&dev->dev, "control urb: bRequestType=%02x " 785 "bRequest=%02x wValue=%04x " 786 "wIndex=%04x wLength=%04x\n", 787 ctrl.bRequestType, ctrl.bRequest, 788 __le16_to_cpup(&ctrl.wValue), 789 __le16_to_cpup(&ctrl.wIndex), 790 __le16_to_cpup(&ctrl.wLength)); 791 if (ctrl.bRequestType & 0x80) { 792 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, 793 ctrl.wLength)) { 794 free_page((unsigned long)tbuf); 795 return -EINVAL; 796 } 797 pipe = usb_rcvctrlpipe(dev, 0); 798 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0); 799 800 usb_unlock_device(dev); 801 i = usb_control_msg(dev, pipe, ctrl.bRequest, 802 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 803 tbuf, ctrl.wLength, tmo); 804 usb_lock_device(dev); 805 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, 806 tbuf, i); 807 if ((i > 0) && ctrl.wLength) { 808 if (copy_to_user(ctrl.data, tbuf, i)) { 809 free_page((unsigned long)tbuf); 810 return -EFAULT; 811 } 812 } 813 } else { 814 if (ctrl.wLength) { 815 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) { 816 free_page((unsigned long)tbuf); 817 return -EFAULT; 818 } 819 } 820 pipe = usb_sndctrlpipe(dev, 0); 821 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, 822 tbuf, ctrl.wLength); 823 824 usb_unlock_device(dev); 825 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, 826 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 827 tbuf, ctrl.wLength, tmo); 828 usb_lock_device(dev); 829 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0); 830 } 831 free_page((unsigned long)tbuf); 832 if (i < 0 && i != -EPIPE) { 833 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL " 834 "failed cmd %s rqt %u rq %u len %u ret %d\n", 835 current->comm, ctrl.bRequestType, ctrl.bRequest, 836 ctrl.wLength, i); 837 } 838 return i; 839 } 840 841 static int proc_bulk(struct dev_state *ps, void __user *arg) 842 { 843 struct usb_device *dev = ps->dev; 844 struct usbdevfs_bulktransfer bulk; 845 unsigned int tmo, len1, pipe; 846 int len2; 847 unsigned char *tbuf; 848 int i, ret; 849 850 if (copy_from_user(&bulk, arg, sizeof(bulk))) 851 return -EFAULT; 852 ret = findintfep(ps->dev, bulk.ep); 853 if (ret < 0) 854 return ret; 855 ret = checkintf(ps, ret); 856 if (ret) 857 return ret; 858 if (bulk.ep & USB_DIR_IN) 859 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f); 860 else 861 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f); 862 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN))) 863 return -EINVAL; 864 len1 = bulk.len; 865 if (len1 > MAX_USBFS_BUFFER_SIZE) 866 return -EINVAL; 867 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) 868 return -ENOMEM; 869 tmo = bulk.timeout; 870 if (bulk.ep & 0x80) { 871 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) { 872 kfree(tbuf); 873 return -EINVAL; 874 } 875 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0); 876 877 usb_unlock_device(dev); 878 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 879 usb_lock_device(dev); 880 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2); 881 882 if (!i && len2) { 883 if (copy_to_user(bulk.data, tbuf, len2)) { 884 kfree(tbuf); 885 return -EFAULT; 886 } 887 } 888 } else { 889 if (len1) { 890 if (copy_from_user(tbuf, bulk.data, len1)) { 891 kfree(tbuf); 892 return -EFAULT; 893 } 894 } 895 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1); 896 897 usb_unlock_device(dev); 898 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 899 usb_lock_device(dev); 900 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0); 901 } 902 kfree(tbuf); 903 if (i < 0) 904 return i; 905 return len2; 906 } 907 908 static int proc_resetep(struct dev_state *ps, void __user *arg) 909 { 910 unsigned int ep; 911 int ret; 912 913 if (get_user(ep, (unsigned int __user *)arg)) 914 return -EFAULT; 915 ret = findintfep(ps->dev, ep); 916 if (ret < 0) 917 return ret; 918 ret = checkintf(ps, ret); 919 if (ret) 920 return ret; 921 usb_reset_endpoint(ps->dev, ep); 922 return 0; 923 } 924 925 static int proc_clearhalt(struct dev_state *ps, void __user *arg) 926 { 927 unsigned int ep; 928 int pipe; 929 int ret; 930 931 if (get_user(ep, (unsigned int __user *)arg)) 932 return -EFAULT; 933 ret = findintfep(ps->dev, ep); 934 if (ret < 0) 935 return ret; 936 ret = checkintf(ps, ret); 937 if (ret) 938 return ret; 939 if (ep & USB_DIR_IN) 940 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f); 941 else 942 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f); 943 944 return usb_clear_halt(ps->dev, pipe); 945 } 946 947 static int proc_getdriver(struct dev_state *ps, void __user *arg) 948 { 949 struct usbdevfs_getdriver gd; 950 struct usb_interface *intf; 951 int ret; 952 953 if (copy_from_user(&gd, arg, sizeof(gd))) 954 return -EFAULT; 955 intf = usb_ifnum_to_if(ps->dev, gd.interface); 956 if (!intf || !intf->dev.driver) 957 ret = -ENODATA; 958 else { 959 strncpy(gd.driver, intf->dev.driver->name, 960 sizeof(gd.driver)); 961 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0); 962 } 963 return ret; 964 } 965 966 static int proc_connectinfo(struct dev_state *ps, void __user *arg) 967 { 968 struct usbdevfs_connectinfo ci; 969 970 ci.devnum = ps->dev->devnum; 971 ci.slow = ps->dev->speed == USB_SPEED_LOW; 972 if (copy_to_user(arg, &ci, sizeof(ci))) 973 return -EFAULT; 974 return 0; 975 } 976 977 static int proc_resetdevice(struct dev_state *ps) 978 { 979 return usb_reset_device(ps->dev); 980 } 981 982 static int proc_setintf(struct dev_state *ps, void __user *arg) 983 { 984 struct usbdevfs_setinterface setintf; 985 int ret; 986 987 if (copy_from_user(&setintf, arg, sizeof(setintf))) 988 return -EFAULT; 989 if ((ret = checkintf(ps, setintf.interface))) 990 return ret; 991 return usb_set_interface(ps->dev, setintf.interface, 992 setintf.altsetting); 993 } 994 995 static int proc_setconfig(struct dev_state *ps, void __user *arg) 996 { 997 int u; 998 int status = 0; 999 struct usb_host_config *actconfig; 1000 1001 if (get_user(u, (int __user *)arg)) 1002 return -EFAULT; 1003 1004 actconfig = ps->dev->actconfig; 1005 1006 /* Don't touch the device if any interfaces are claimed. 1007 * It could interfere with other drivers' operations, and if 1008 * an interface is claimed by usbfs it could easily deadlock. 1009 */ 1010 if (actconfig) { 1011 int i; 1012 1013 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) { 1014 if (usb_interface_claimed(actconfig->interface[i])) { 1015 dev_warn(&ps->dev->dev, 1016 "usbfs: interface %d claimed by %s " 1017 "while '%s' sets config #%d\n", 1018 actconfig->interface[i] 1019 ->cur_altsetting 1020 ->desc.bInterfaceNumber, 1021 actconfig->interface[i] 1022 ->dev.driver->name, 1023 current->comm, u); 1024 status = -EBUSY; 1025 break; 1026 } 1027 } 1028 } 1029 1030 /* SET_CONFIGURATION is often abused as a "cheap" driver reset, 1031 * so avoid usb_set_configuration()'s kick to sysfs 1032 */ 1033 if (status == 0) { 1034 if (actconfig && actconfig->desc.bConfigurationValue == u) 1035 status = usb_reset_configuration(ps->dev); 1036 else 1037 status = usb_set_configuration(ps->dev, u); 1038 } 1039 1040 return status; 1041 } 1042 1043 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb, 1044 struct usbdevfs_iso_packet_desc __user *iso_frame_desc, 1045 void __user *arg) 1046 { 1047 struct usbdevfs_iso_packet_desc *isopkt = NULL; 1048 struct usb_host_endpoint *ep; 1049 struct async *as; 1050 struct usb_ctrlrequest *dr = NULL; 1051 const struct cred *cred = current_cred(); 1052 unsigned int u, totlen, isofrmlen; 1053 int ret, ifnum = -1; 1054 int is_in; 1055 1056 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP | 1057 USBDEVFS_URB_SHORT_NOT_OK | 1058 USBDEVFS_URB_BULK_CONTINUATION | 1059 USBDEVFS_URB_NO_FSBR | 1060 USBDEVFS_URB_ZERO_PACKET | 1061 USBDEVFS_URB_NO_INTERRUPT)) 1062 return -EINVAL; 1063 if (uurb->buffer_length > 0 && !uurb->buffer) 1064 return -EINVAL; 1065 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && 1066 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) { 1067 ifnum = findintfep(ps->dev, uurb->endpoint); 1068 if (ifnum < 0) 1069 return ifnum; 1070 ret = checkintf(ps, ifnum); 1071 if (ret) 1072 return ret; 1073 } 1074 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) { 1075 is_in = 1; 1076 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 1077 } else { 1078 is_in = 0; 1079 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 1080 } 1081 if (!ep) 1082 return -ENOENT; 1083 switch(uurb->type) { 1084 case USBDEVFS_URB_TYPE_CONTROL: 1085 if (!usb_endpoint_xfer_control(&ep->desc)) 1086 return -EINVAL; 1087 /* min 8 byte setup packet, 1088 * max 8 byte setup plus an arbitrary data stage */ 1089 if (uurb->buffer_length < 8 || 1090 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE)) 1091 return -EINVAL; 1092 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); 1093 if (!dr) 1094 return -ENOMEM; 1095 if (copy_from_user(dr, uurb->buffer, 8)) { 1096 kfree(dr); 1097 return -EFAULT; 1098 } 1099 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) { 1100 kfree(dr); 1101 return -EINVAL; 1102 } 1103 ret = check_ctrlrecip(ps, dr->bRequestType, 1104 le16_to_cpup(&dr->wIndex)); 1105 if (ret) { 1106 kfree(dr); 1107 return ret; 1108 } 1109 uurb->number_of_packets = 0; 1110 uurb->buffer_length = le16_to_cpup(&dr->wLength); 1111 uurb->buffer += 8; 1112 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) { 1113 is_in = 1; 1114 uurb->endpoint |= USB_DIR_IN; 1115 } else { 1116 is_in = 0; 1117 uurb->endpoint &= ~USB_DIR_IN; 1118 } 1119 snoop(&ps->dev->dev, "control urb: bRequestType=%02x " 1120 "bRequest=%02x wValue=%04x " 1121 "wIndex=%04x wLength=%04x\n", 1122 dr->bRequestType, dr->bRequest, 1123 __le16_to_cpup(&dr->wValue), 1124 __le16_to_cpup(&dr->wIndex), 1125 __le16_to_cpup(&dr->wLength)); 1126 break; 1127 1128 case USBDEVFS_URB_TYPE_BULK: 1129 switch (usb_endpoint_type(&ep->desc)) { 1130 case USB_ENDPOINT_XFER_CONTROL: 1131 case USB_ENDPOINT_XFER_ISOC: 1132 return -EINVAL; 1133 case USB_ENDPOINT_XFER_INT: 1134 /* allow single-shot interrupt transfers */ 1135 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT; 1136 goto interrupt_urb; 1137 } 1138 uurb->number_of_packets = 0; 1139 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE) 1140 return -EINVAL; 1141 break; 1142 1143 case USBDEVFS_URB_TYPE_INTERRUPT: 1144 if (!usb_endpoint_xfer_int(&ep->desc)) 1145 return -EINVAL; 1146 interrupt_urb: 1147 uurb->number_of_packets = 0; 1148 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE) 1149 return -EINVAL; 1150 break; 1151 1152 case USBDEVFS_URB_TYPE_ISO: 1153 /* arbitrary limit */ 1154 if (uurb->number_of_packets < 1 || 1155 uurb->number_of_packets > 128) 1156 return -EINVAL; 1157 if (!usb_endpoint_xfer_isoc(&ep->desc)) 1158 return -EINVAL; 1159 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * 1160 uurb->number_of_packets; 1161 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL))) 1162 return -ENOMEM; 1163 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) { 1164 kfree(isopkt); 1165 return -EFAULT; 1166 } 1167 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1168 /* arbitrary limit, 1169 * sufficient for USB 2.0 high-bandwidth iso */ 1170 if (isopkt[u].length > 8192) { 1171 kfree(isopkt); 1172 return -EINVAL; 1173 } 1174 totlen += isopkt[u].length; 1175 } 1176 /* 3072 * 64 microframes */ 1177 if (totlen > 196608) { 1178 kfree(isopkt); 1179 return -EINVAL; 1180 } 1181 uurb->buffer_length = totlen; 1182 break; 1183 1184 default: 1185 return -EINVAL; 1186 } 1187 if (uurb->buffer_length > 0 && 1188 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1189 uurb->buffer, uurb->buffer_length)) { 1190 kfree(isopkt); 1191 kfree(dr); 1192 return -EFAULT; 1193 } 1194 as = alloc_async(uurb->number_of_packets); 1195 if (!as) { 1196 kfree(isopkt); 1197 kfree(dr); 1198 return -ENOMEM; 1199 } 1200 if (uurb->buffer_length > 0) { 1201 as->urb->transfer_buffer = kmalloc(uurb->buffer_length, 1202 GFP_KERNEL); 1203 if (!as->urb->transfer_buffer) { 1204 kfree(isopkt); 1205 kfree(dr); 1206 free_async(as); 1207 return -ENOMEM; 1208 } 1209 /* Isochronous input data may end up being discontiguous 1210 * if some of the packets are short. Clear the buffer so 1211 * that the gaps don't leak kernel data to userspace. 1212 */ 1213 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO) 1214 memset(as->urb->transfer_buffer, 0, 1215 uurb->buffer_length); 1216 } 1217 as->urb->dev = ps->dev; 1218 as->urb->pipe = (uurb->type << 30) | 1219 __create_pipe(ps->dev, uurb->endpoint & 0xf) | 1220 (uurb->endpoint & USB_DIR_IN); 1221 1222 /* This tedious sequence is necessary because the URB_* flags 1223 * are internal to the kernel and subject to change, whereas 1224 * the USBDEVFS_URB_* flags are a user API and must not be changed. 1225 */ 1226 u = (is_in ? URB_DIR_IN : URB_DIR_OUT); 1227 if (uurb->flags & USBDEVFS_URB_ISO_ASAP) 1228 u |= URB_ISO_ASAP; 1229 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK) 1230 u |= URB_SHORT_NOT_OK; 1231 if (uurb->flags & USBDEVFS_URB_NO_FSBR) 1232 u |= URB_NO_FSBR; 1233 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET) 1234 u |= URB_ZERO_PACKET; 1235 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT) 1236 u |= URB_NO_INTERRUPT; 1237 as->urb->transfer_flags = u; 1238 1239 as->urb->transfer_buffer_length = uurb->buffer_length; 1240 as->urb->setup_packet = (unsigned char *)dr; 1241 as->urb->start_frame = uurb->start_frame; 1242 as->urb->number_of_packets = uurb->number_of_packets; 1243 if (uurb->type == USBDEVFS_URB_TYPE_ISO || 1244 ps->dev->speed == USB_SPEED_HIGH) 1245 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1); 1246 else 1247 as->urb->interval = ep->desc.bInterval; 1248 as->urb->context = as; 1249 as->urb->complete = async_completed; 1250 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1251 as->urb->iso_frame_desc[u].offset = totlen; 1252 as->urb->iso_frame_desc[u].length = isopkt[u].length; 1253 totlen += isopkt[u].length; 1254 } 1255 kfree(isopkt); 1256 as->ps = ps; 1257 as->userurb = arg; 1258 if (is_in && uurb->buffer_length > 0) 1259 as->userbuffer = uurb->buffer; 1260 else 1261 as->userbuffer = NULL; 1262 as->signr = uurb->signr; 1263 as->ifnum = ifnum; 1264 as->pid = get_pid(task_pid(current)); 1265 as->uid = cred->uid; 1266 as->euid = cred->euid; 1267 security_task_getsecid(current, &as->secid); 1268 if (!is_in && uurb->buffer_length > 0) { 1269 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, 1270 uurb->buffer_length)) { 1271 free_async(as); 1272 return -EFAULT; 1273 } 1274 } 1275 snoop_urb(ps->dev, as->userurb, as->urb->pipe, 1276 as->urb->transfer_buffer_length, 0, SUBMIT, 1277 is_in ? NULL : as->urb->transfer_buffer, 1278 uurb->buffer_length); 1279 async_newpending(as); 1280 1281 if (usb_endpoint_xfer_bulk(&ep->desc)) { 1282 spin_lock_irq(&ps->lock); 1283 1284 /* Not exactly the endpoint address; the direction bit is 1285 * shifted to the 0x10 position so that the value will be 1286 * between 0 and 31. 1287 */ 1288 as->bulk_addr = usb_endpoint_num(&ep->desc) | 1289 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK) 1290 >> 3); 1291 1292 /* If this bulk URB is the start of a new transfer, re-enable 1293 * the endpoint. Otherwise mark it as a continuation URB. 1294 */ 1295 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION) 1296 as->bulk_status = AS_CONTINUATION; 1297 else 1298 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr); 1299 1300 /* Don't accept continuation URBs if the endpoint is 1301 * disabled because of an earlier error. 1302 */ 1303 if (ps->disabled_bulk_eps & (1 << as->bulk_addr)) 1304 ret = -EREMOTEIO; 1305 else 1306 ret = usb_submit_urb(as->urb, GFP_ATOMIC); 1307 spin_unlock_irq(&ps->lock); 1308 } else { 1309 ret = usb_submit_urb(as->urb, GFP_KERNEL); 1310 } 1311 1312 if (ret) { 1313 dev_printk(KERN_DEBUG, &ps->dev->dev, 1314 "usbfs: usb_submit_urb returned %d\n", ret); 1315 snoop_urb(ps->dev, as->userurb, as->urb->pipe, 1316 0, ret, COMPLETE, NULL, 0); 1317 async_removepending(as); 1318 free_async(as); 1319 return ret; 1320 } 1321 return 0; 1322 } 1323 1324 static int proc_submiturb(struct dev_state *ps, void __user *arg) 1325 { 1326 struct usbdevfs_urb uurb; 1327 1328 if (copy_from_user(&uurb, arg, sizeof(uurb))) 1329 return -EFAULT; 1330 1331 return proc_do_submiturb(ps, &uurb, 1332 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), 1333 arg); 1334 } 1335 1336 static int proc_unlinkurb(struct dev_state *ps, void __user *arg) 1337 { 1338 struct async *as; 1339 1340 as = async_getpending(ps, arg); 1341 if (!as) 1342 return -EINVAL; 1343 usb_kill_urb(as->urb); 1344 return 0; 1345 } 1346 1347 static int processcompl(struct async *as, void __user * __user *arg) 1348 { 1349 struct urb *urb = as->urb; 1350 struct usbdevfs_urb __user *userurb = as->userurb; 1351 void __user *addr = as->userurb; 1352 unsigned int i; 1353 1354 if (as->userbuffer && urb->actual_length) { 1355 if (urb->number_of_packets > 0) /* Isochronous */ 1356 i = urb->transfer_buffer_length; 1357 else /* Non-Isoc */ 1358 i = urb->actual_length; 1359 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i)) 1360 goto err_out; 1361 } 1362 if (put_user(as->status, &userurb->status)) 1363 goto err_out; 1364 if (put_user(urb->actual_length, &userurb->actual_length)) 1365 goto err_out; 1366 if (put_user(urb->error_count, &userurb->error_count)) 1367 goto err_out; 1368 1369 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1370 for (i = 0; i < urb->number_of_packets; i++) { 1371 if (put_user(urb->iso_frame_desc[i].actual_length, 1372 &userurb->iso_frame_desc[i].actual_length)) 1373 goto err_out; 1374 if (put_user(urb->iso_frame_desc[i].status, 1375 &userurb->iso_frame_desc[i].status)) 1376 goto err_out; 1377 } 1378 } 1379 1380 if (put_user(addr, (void __user * __user *)arg)) 1381 return -EFAULT; 1382 return 0; 1383 1384 err_out: 1385 return -EFAULT; 1386 } 1387 1388 static struct async *reap_as(struct dev_state *ps) 1389 { 1390 DECLARE_WAITQUEUE(wait, current); 1391 struct async *as = NULL; 1392 struct usb_device *dev = ps->dev; 1393 1394 add_wait_queue(&ps->wait, &wait); 1395 for (;;) { 1396 __set_current_state(TASK_INTERRUPTIBLE); 1397 as = async_getcompleted(ps); 1398 if (as) 1399 break; 1400 if (signal_pending(current)) 1401 break; 1402 usb_unlock_device(dev); 1403 schedule(); 1404 usb_lock_device(dev); 1405 } 1406 remove_wait_queue(&ps->wait, &wait); 1407 set_current_state(TASK_RUNNING); 1408 return as; 1409 } 1410 1411 static int proc_reapurb(struct dev_state *ps, void __user *arg) 1412 { 1413 struct async *as = reap_as(ps); 1414 if (as) { 1415 int retval = processcompl(as, (void __user * __user *)arg); 1416 free_async(as); 1417 return retval; 1418 } 1419 if (signal_pending(current)) 1420 return -EINTR; 1421 return -EIO; 1422 } 1423 1424 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg) 1425 { 1426 int retval; 1427 struct async *as; 1428 1429 as = async_getcompleted(ps); 1430 retval = -EAGAIN; 1431 if (as) { 1432 retval = processcompl(as, (void __user * __user *)arg); 1433 free_async(as); 1434 } 1435 return retval; 1436 } 1437 1438 #ifdef CONFIG_COMPAT 1439 static int proc_control_compat(struct dev_state *ps, 1440 struct usbdevfs_ctrltransfer32 __user *p32) 1441 { 1442 struct usbdevfs_ctrltransfer __user *p; 1443 __u32 udata; 1444 p = compat_alloc_user_space(sizeof(*p)); 1445 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) || 1446 get_user(udata, &p32->data) || 1447 put_user(compat_ptr(udata), &p->data)) 1448 return -EFAULT; 1449 return proc_control(ps, p); 1450 } 1451 1452 static int proc_bulk_compat(struct dev_state *ps, 1453 struct usbdevfs_bulktransfer32 __user *p32) 1454 { 1455 struct usbdevfs_bulktransfer __user *p; 1456 compat_uint_t n; 1457 compat_caddr_t addr; 1458 1459 p = compat_alloc_user_space(sizeof(*p)); 1460 1461 if (get_user(n, &p32->ep) || put_user(n, &p->ep) || 1462 get_user(n, &p32->len) || put_user(n, &p->len) || 1463 get_user(n, &p32->timeout) || put_user(n, &p->timeout) || 1464 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data)) 1465 return -EFAULT; 1466 1467 return proc_bulk(ps, p); 1468 } 1469 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg) 1470 { 1471 struct usbdevfs_disconnectsignal32 ds; 1472 1473 if (copy_from_user(&ds, arg, sizeof(ds))) 1474 return -EFAULT; 1475 ps->discsignr = ds.signr; 1476 ps->disccontext = compat_ptr(ds.context); 1477 return 0; 1478 } 1479 1480 static int get_urb32(struct usbdevfs_urb *kurb, 1481 struct usbdevfs_urb32 __user *uurb) 1482 { 1483 __u32 uptr; 1484 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) || 1485 __get_user(kurb->type, &uurb->type) || 1486 __get_user(kurb->endpoint, &uurb->endpoint) || 1487 __get_user(kurb->status, &uurb->status) || 1488 __get_user(kurb->flags, &uurb->flags) || 1489 __get_user(kurb->buffer_length, &uurb->buffer_length) || 1490 __get_user(kurb->actual_length, &uurb->actual_length) || 1491 __get_user(kurb->start_frame, &uurb->start_frame) || 1492 __get_user(kurb->number_of_packets, &uurb->number_of_packets) || 1493 __get_user(kurb->error_count, &uurb->error_count) || 1494 __get_user(kurb->signr, &uurb->signr)) 1495 return -EFAULT; 1496 1497 if (__get_user(uptr, &uurb->buffer)) 1498 return -EFAULT; 1499 kurb->buffer = compat_ptr(uptr); 1500 if (__get_user(uptr, &uurb->usercontext)) 1501 return -EFAULT; 1502 kurb->usercontext = compat_ptr(uptr); 1503 1504 return 0; 1505 } 1506 1507 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg) 1508 { 1509 struct usbdevfs_urb uurb; 1510 1511 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg)) 1512 return -EFAULT; 1513 1514 return proc_do_submiturb(ps, &uurb, 1515 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, 1516 arg); 1517 } 1518 1519 static int processcompl_compat(struct async *as, void __user * __user *arg) 1520 { 1521 struct urb *urb = as->urb; 1522 struct usbdevfs_urb32 __user *userurb = as->userurb; 1523 void __user *addr = as->userurb; 1524 unsigned int i; 1525 1526 if (as->userbuffer && urb->actual_length) 1527 if (copy_to_user(as->userbuffer, urb->transfer_buffer, 1528 urb->actual_length)) 1529 return -EFAULT; 1530 if (put_user(as->status, &userurb->status)) 1531 return -EFAULT; 1532 if (put_user(urb->actual_length, &userurb->actual_length)) 1533 return -EFAULT; 1534 if (put_user(urb->error_count, &userurb->error_count)) 1535 return -EFAULT; 1536 1537 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1538 for (i = 0; i < urb->number_of_packets; i++) { 1539 if (put_user(urb->iso_frame_desc[i].actual_length, 1540 &userurb->iso_frame_desc[i].actual_length)) 1541 return -EFAULT; 1542 if (put_user(urb->iso_frame_desc[i].status, 1543 &userurb->iso_frame_desc[i].status)) 1544 return -EFAULT; 1545 } 1546 } 1547 1548 if (put_user(ptr_to_compat(addr), (u32 __user *)arg)) 1549 return -EFAULT; 1550 return 0; 1551 } 1552 1553 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg) 1554 { 1555 struct async *as = reap_as(ps); 1556 if (as) { 1557 int retval = processcompl_compat(as, (void __user * __user *)arg); 1558 free_async(as); 1559 return retval; 1560 } 1561 if (signal_pending(current)) 1562 return -EINTR; 1563 return -EIO; 1564 } 1565 1566 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg) 1567 { 1568 int retval; 1569 struct async *as; 1570 1571 retval = -EAGAIN; 1572 as = async_getcompleted(ps); 1573 if (as) { 1574 retval = processcompl_compat(as, (void __user * __user *)arg); 1575 free_async(as); 1576 } 1577 return retval; 1578 } 1579 1580 1581 #endif 1582 1583 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg) 1584 { 1585 struct usbdevfs_disconnectsignal ds; 1586 1587 if (copy_from_user(&ds, arg, sizeof(ds))) 1588 return -EFAULT; 1589 ps->discsignr = ds.signr; 1590 ps->disccontext = ds.context; 1591 return 0; 1592 } 1593 1594 static int proc_claiminterface(struct dev_state *ps, void __user *arg) 1595 { 1596 unsigned int ifnum; 1597 1598 if (get_user(ifnum, (unsigned int __user *)arg)) 1599 return -EFAULT; 1600 return claimintf(ps, ifnum); 1601 } 1602 1603 static int proc_releaseinterface(struct dev_state *ps, void __user *arg) 1604 { 1605 unsigned int ifnum; 1606 int ret; 1607 1608 if (get_user(ifnum, (unsigned int __user *)arg)) 1609 return -EFAULT; 1610 if ((ret = releaseintf(ps, ifnum)) < 0) 1611 return ret; 1612 destroy_async_on_interface (ps, ifnum); 1613 return 0; 1614 } 1615 1616 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl) 1617 { 1618 int size; 1619 void *buf = NULL; 1620 int retval = 0; 1621 struct usb_interface *intf = NULL; 1622 struct usb_driver *driver = NULL; 1623 1624 /* alloc buffer */ 1625 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) { 1626 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL) 1627 return -ENOMEM; 1628 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) { 1629 if (copy_from_user(buf, ctl->data, size)) { 1630 kfree(buf); 1631 return -EFAULT; 1632 } 1633 } else { 1634 memset(buf, 0, size); 1635 } 1636 } 1637 1638 if (!connected(ps)) { 1639 kfree(buf); 1640 return -ENODEV; 1641 } 1642 1643 if (ps->dev->state != USB_STATE_CONFIGURED) 1644 retval = -EHOSTUNREACH; 1645 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno))) 1646 retval = -EINVAL; 1647 else switch (ctl->ioctl_code) { 1648 1649 /* disconnect kernel driver from interface */ 1650 case USBDEVFS_DISCONNECT: 1651 if (intf->dev.driver) { 1652 driver = to_usb_driver(intf->dev.driver); 1653 dev_dbg(&intf->dev, "disconnect by usbfs\n"); 1654 usb_driver_release_interface(driver, intf); 1655 } else 1656 retval = -ENODATA; 1657 break; 1658 1659 /* let kernel drivers try to (re)bind to the interface */ 1660 case USBDEVFS_CONNECT: 1661 if (!intf->dev.driver) 1662 retval = device_attach(&intf->dev); 1663 else 1664 retval = -EBUSY; 1665 break; 1666 1667 /* talk directly to the interface's driver */ 1668 default: 1669 if (intf->dev.driver) 1670 driver = to_usb_driver(intf->dev.driver); 1671 if (driver == NULL || driver->ioctl == NULL) { 1672 retval = -ENOTTY; 1673 } else { 1674 /* keep API that guarantees BKL */ 1675 lock_kernel(); 1676 retval = driver->ioctl(intf, ctl->ioctl_code, buf); 1677 unlock_kernel(); 1678 if (retval == -ENOIOCTLCMD) 1679 retval = -ENOTTY; 1680 } 1681 } 1682 1683 /* cleanup and return */ 1684 if (retval >= 0 1685 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0 1686 && size > 0 1687 && copy_to_user(ctl->data, buf, size) != 0) 1688 retval = -EFAULT; 1689 1690 kfree(buf); 1691 return retval; 1692 } 1693 1694 static int proc_ioctl_default(struct dev_state *ps, void __user *arg) 1695 { 1696 struct usbdevfs_ioctl ctrl; 1697 1698 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 1699 return -EFAULT; 1700 return proc_ioctl(ps, &ctrl); 1701 } 1702 1703 #ifdef CONFIG_COMPAT 1704 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg) 1705 { 1706 struct usbdevfs_ioctl32 __user *uioc; 1707 struct usbdevfs_ioctl ctrl; 1708 u32 udata; 1709 1710 uioc = compat_ptr((long)arg); 1711 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) || 1712 __get_user(ctrl.ifno, &uioc->ifno) || 1713 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) || 1714 __get_user(udata, &uioc->data)) 1715 return -EFAULT; 1716 ctrl.data = compat_ptr(udata); 1717 1718 return proc_ioctl(ps, &ctrl); 1719 } 1720 #endif 1721 1722 static int proc_claim_port(struct dev_state *ps, void __user *arg) 1723 { 1724 unsigned portnum; 1725 int rc; 1726 1727 if (get_user(portnum, (unsigned __user *) arg)) 1728 return -EFAULT; 1729 rc = usb_hub_claim_port(ps->dev, portnum, ps); 1730 if (rc == 0) 1731 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n", 1732 portnum, task_pid_nr(current), current->comm); 1733 return rc; 1734 } 1735 1736 static int proc_release_port(struct dev_state *ps, void __user *arg) 1737 { 1738 unsigned portnum; 1739 1740 if (get_user(portnum, (unsigned __user *) arg)) 1741 return -EFAULT; 1742 return usb_hub_release_port(ps->dev, portnum, ps); 1743 } 1744 1745 /* 1746 * NOTE: All requests here that have interface numbers as parameters 1747 * are assuming that somehow the configuration has been prevented from 1748 * changing. But there's no mechanism to ensure that... 1749 */ 1750 static long usbdev_do_ioctl(struct file *file, unsigned int cmd, 1751 void __user *p) 1752 { 1753 struct dev_state *ps = file->private_data; 1754 struct inode *inode = file->f_path.dentry->d_inode; 1755 struct usb_device *dev = ps->dev; 1756 int ret = -ENOTTY; 1757 1758 if (!(file->f_mode & FMODE_WRITE)) 1759 return -EPERM; 1760 1761 usb_lock_device(dev); 1762 if (!connected(ps)) { 1763 usb_unlock_device(dev); 1764 return -ENODEV; 1765 } 1766 1767 switch (cmd) { 1768 case USBDEVFS_CONTROL: 1769 snoop(&dev->dev, "%s: CONTROL\n", __func__); 1770 ret = proc_control(ps, p); 1771 if (ret >= 0) 1772 inode->i_mtime = CURRENT_TIME; 1773 break; 1774 1775 case USBDEVFS_BULK: 1776 snoop(&dev->dev, "%s: BULK\n", __func__); 1777 ret = proc_bulk(ps, p); 1778 if (ret >= 0) 1779 inode->i_mtime = CURRENT_TIME; 1780 break; 1781 1782 case USBDEVFS_RESETEP: 1783 snoop(&dev->dev, "%s: RESETEP\n", __func__); 1784 ret = proc_resetep(ps, p); 1785 if (ret >= 0) 1786 inode->i_mtime = CURRENT_TIME; 1787 break; 1788 1789 case USBDEVFS_RESET: 1790 snoop(&dev->dev, "%s: RESET\n", __func__); 1791 ret = proc_resetdevice(ps); 1792 break; 1793 1794 case USBDEVFS_CLEAR_HALT: 1795 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__); 1796 ret = proc_clearhalt(ps, p); 1797 if (ret >= 0) 1798 inode->i_mtime = CURRENT_TIME; 1799 break; 1800 1801 case USBDEVFS_GETDRIVER: 1802 snoop(&dev->dev, "%s: GETDRIVER\n", __func__); 1803 ret = proc_getdriver(ps, p); 1804 break; 1805 1806 case USBDEVFS_CONNECTINFO: 1807 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__); 1808 ret = proc_connectinfo(ps, p); 1809 break; 1810 1811 case USBDEVFS_SETINTERFACE: 1812 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__); 1813 ret = proc_setintf(ps, p); 1814 break; 1815 1816 case USBDEVFS_SETCONFIGURATION: 1817 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__); 1818 ret = proc_setconfig(ps, p); 1819 break; 1820 1821 case USBDEVFS_SUBMITURB: 1822 snoop(&dev->dev, "%s: SUBMITURB\n", __func__); 1823 ret = proc_submiturb(ps, p); 1824 if (ret >= 0) 1825 inode->i_mtime = CURRENT_TIME; 1826 break; 1827 1828 #ifdef CONFIG_COMPAT 1829 case USBDEVFS_CONTROL32: 1830 snoop(&dev->dev, "%s: CONTROL32\n", __func__); 1831 ret = proc_control_compat(ps, p); 1832 if (ret >= 0) 1833 inode->i_mtime = CURRENT_TIME; 1834 break; 1835 1836 case USBDEVFS_BULK32: 1837 snoop(&dev->dev, "%s: BULK32\n", __func__); 1838 ret = proc_bulk_compat(ps, p); 1839 if (ret >= 0) 1840 inode->i_mtime = CURRENT_TIME; 1841 break; 1842 1843 case USBDEVFS_DISCSIGNAL32: 1844 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__); 1845 ret = proc_disconnectsignal_compat(ps, p); 1846 break; 1847 1848 case USBDEVFS_SUBMITURB32: 1849 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__); 1850 ret = proc_submiturb_compat(ps, p); 1851 if (ret >= 0) 1852 inode->i_mtime = CURRENT_TIME; 1853 break; 1854 1855 case USBDEVFS_REAPURB32: 1856 snoop(&dev->dev, "%s: REAPURB32\n", __func__); 1857 ret = proc_reapurb_compat(ps, p); 1858 break; 1859 1860 case USBDEVFS_REAPURBNDELAY32: 1861 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__); 1862 ret = proc_reapurbnonblock_compat(ps, p); 1863 break; 1864 1865 case USBDEVFS_IOCTL32: 1866 snoop(&dev->dev, "%s: IOCTL32\n", __func__); 1867 ret = proc_ioctl_compat(ps, ptr_to_compat(p)); 1868 break; 1869 #endif 1870 1871 case USBDEVFS_DISCARDURB: 1872 snoop(&dev->dev, "%s: DISCARDURB\n", __func__); 1873 ret = proc_unlinkurb(ps, p); 1874 break; 1875 1876 case USBDEVFS_REAPURB: 1877 snoop(&dev->dev, "%s: REAPURB\n", __func__); 1878 ret = proc_reapurb(ps, p); 1879 break; 1880 1881 case USBDEVFS_REAPURBNDELAY: 1882 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__); 1883 ret = proc_reapurbnonblock(ps, p); 1884 break; 1885 1886 case USBDEVFS_DISCSIGNAL: 1887 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__); 1888 ret = proc_disconnectsignal(ps, p); 1889 break; 1890 1891 case USBDEVFS_CLAIMINTERFACE: 1892 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__); 1893 ret = proc_claiminterface(ps, p); 1894 break; 1895 1896 case USBDEVFS_RELEASEINTERFACE: 1897 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__); 1898 ret = proc_releaseinterface(ps, p); 1899 break; 1900 1901 case USBDEVFS_IOCTL: 1902 snoop(&dev->dev, "%s: IOCTL\n", __func__); 1903 ret = proc_ioctl_default(ps, p); 1904 break; 1905 1906 case USBDEVFS_CLAIM_PORT: 1907 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__); 1908 ret = proc_claim_port(ps, p); 1909 break; 1910 1911 case USBDEVFS_RELEASE_PORT: 1912 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__); 1913 ret = proc_release_port(ps, p); 1914 break; 1915 } 1916 usb_unlock_device(dev); 1917 if (ret >= 0) 1918 inode->i_atime = CURRENT_TIME; 1919 return ret; 1920 } 1921 1922 static long usbdev_ioctl(struct file *file, unsigned int cmd, 1923 unsigned long arg) 1924 { 1925 int ret; 1926 1927 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg); 1928 1929 return ret; 1930 } 1931 1932 #ifdef CONFIG_COMPAT 1933 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd, 1934 unsigned long arg) 1935 { 1936 int ret; 1937 1938 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg)); 1939 1940 return ret; 1941 } 1942 #endif 1943 1944 /* No kernel lock - fine */ 1945 static unsigned int usbdev_poll(struct file *file, 1946 struct poll_table_struct *wait) 1947 { 1948 struct dev_state *ps = file->private_data; 1949 unsigned int mask = 0; 1950 1951 poll_wait(file, &ps->wait, wait); 1952 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed)) 1953 mask |= POLLOUT | POLLWRNORM; 1954 if (!connected(ps)) 1955 mask |= POLLERR | POLLHUP; 1956 return mask; 1957 } 1958 1959 const struct file_operations usbdev_file_operations = { 1960 .owner = THIS_MODULE, 1961 .llseek = usbdev_lseek, 1962 .read = usbdev_read, 1963 .poll = usbdev_poll, 1964 .unlocked_ioctl = usbdev_ioctl, 1965 #ifdef CONFIG_COMPAT 1966 .compat_ioctl = usbdev_compat_ioctl, 1967 #endif 1968 .open = usbdev_open, 1969 .release = usbdev_release, 1970 }; 1971 1972 static void usbdev_remove(struct usb_device *udev) 1973 { 1974 struct dev_state *ps; 1975 struct siginfo sinfo; 1976 1977 while (!list_empty(&udev->filelist)) { 1978 ps = list_entry(udev->filelist.next, struct dev_state, list); 1979 destroy_all_async(ps); 1980 wake_up_all(&ps->wait); 1981 list_del_init(&ps->list); 1982 if (ps->discsignr) { 1983 sinfo.si_signo = ps->discsignr; 1984 sinfo.si_errno = EPIPE; 1985 sinfo.si_code = SI_ASYNCIO; 1986 sinfo.si_addr = ps->disccontext; 1987 kill_pid_info_as_uid(ps->discsignr, &sinfo, 1988 ps->disc_pid, ps->disc_uid, 1989 ps->disc_euid, ps->secid); 1990 } 1991 } 1992 } 1993 1994 #ifdef CONFIG_USB_DEVICE_CLASS 1995 static struct class *usb_classdev_class; 1996 1997 static int usb_classdev_add(struct usb_device *dev) 1998 { 1999 struct device *cldev; 2000 2001 cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt, 2002 NULL, "usbdev%d.%d", dev->bus->busnum, 2003 dev->devnum); 2004 if (IS_ERR(cldev)) 2005 return PTR_ERR(cldev); 2006 dev->usb_classdev = cldev; 2007 return 0; 2008 } 2009 2010 static void usb_classdev_remove(struct usb_device *dev) 2011 { 2012 if (dev->usb_classdev) 2013 device_unregister(dev->usb_classdev); 2014 } 2015 2016 #else 2017 #define usb_classdev_add(dev) 0 2018 #define usb_classdev_remove(dev) do {} while (0) 2019 2020 #endif 2021 2022 static int usbdev_notify(struct notifier_block *self, 2023 unsigned long action, void *dev) 2024 { 2025 switch (action) { 2026 case USB_DEVICE_ADD: 2027 if (usb_classdev_add(dev)) 2028 return NOTIFY_BAD; 2029 break; 2030 case USB_DEVICE_REMOVE: 2031 usb_classdev_remove(dev); 2032 usbdev_remove(dev); 2033 break; 2034 } 2035 return NOTIFY_OK; 2036 } 2037 2038 static struct notifier_block usbdev_nb = { 2039 .notifier_call = usbdev_notify, 2040 }; 2041 2042 static struct cdev usb_device_cdev; 2043 2044 int __init usb_devio_init(void) 2045 { 2046 int retval; 2047 2048 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX, 2049 "usb_device"); 2050 if (retval) { 2051 printk(KERN_ERR "Unable to register minors for usb_device\n"); 2052 goto out; 2053 } 2054 cdev_init(&usb_device_cdev, &usbdev_file_operations); 2055 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX); 2056 if (retval) { 2057 printk(KERN_ERR "Unable to get usb_device major %d\n", 2058 USB_DEVICE_MAJOR); 2059 goto error_cdev; 2060 } 2061 #ifdef CONFIG_USB_DEVICE_CLASS 2062 usb_classdev_class = class_create(THIS_MODULE, "usb_device"); 2063 if (IS_ERR(usb_classdev_class)) { 2064 printk(KERN_ERR "Unable to register usb_device class\n"); 2065 retval = PTR_ERR(usb_classdev_class); 2066 cdev_del(&usb_device_cdev); 2067 usb_classdev_class = NULL; 2068 goto out; 2069 } 2070 /* devices of this class shadow the major:minor of their parent 2071 * device, so clear ->dev_kobj to prevent adding duplicate entries 2072 * to /sys/dev 2073 */ 2074 usb_classdev_class->dev_kobj = NULL; 2075 #endif 2076 usb_register_notify(&usbdev_nb); 2077 out: 2078 return retval; 2079 2080 error_cdev: 2081 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 2082 goto out; 2083 } 2084 2085 void usb_devio_cleanup(void) 2086 { 2087 usb_unregister_notify(&usbdev_nb); 2088 #ifdef CONFIG_USB_DEVICE_CLASS 2089 class_destroy(usb_classdev_class); 2090 #endif 2091 cdev_del(&usb_device_cdev); 2092 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 2093 } 2094