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/signal.h> 41 #include <linux/poll.h> 42 #include <linux/module.h> 43 #include <linux/usb.h> 44 #include <linux/usbdevice_fs.h> 45 #include <linux/usb/hcd.h> /* for usbcore internals */ 46 #include <linux/cdev.h> 47 #include <linux/notifier.h> 48 #include <linux/security.h> 49 #include <linux/user_namespace.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 const struct cred *cred; 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 const struct cred *cred; 84 unsigned int signr; 85 unsigned int ifnum; 86 void __user *userbuffer; 87 void __user *userurb; 88 struct urb *urb; 89 unsigned int mem_usage; 90 int status; 91 u32 secid; 92 u8 bulk_addr; 93 u8 bulk_status; 94 }; 95 96 static bool usbfs_snoop; 97 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR); 98 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic"); 99 100 #define snoop(dev, format, arg...) \ 101 do { \ 102 if (usbfs_snoop) \ 103 dev_info(dev , format , ## arg); \ 104 } while (0) 105 106 enum snoop_when { 107 SUBMIT, COMPLETE 108 }; 109 110 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0) 111 112 /* Limit on the total amount of memory we can allocate for transfers */ 113 static unsigned usbfs_memory_mb = 16; 114 module_param(usbfs_memory_mb, uint, 0644); 115 MODULE_PARM_DESC(usbfs_memory_mb, 116 "maximum MB allowed for usbfs buffers (0 = no limit)"); 117 118 /* Hard limit, necessary to avoid aithmetic overflow */ 119 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000) 120 121 static atomic_t usbfs_memory_usage; /* Total memory currently allocated */ 122 123 /* Check whether it's okay to allocate more memory for a transfer */ 124 static int usbfs_increase_memory_usage(unsigned amount) 125 { 126 unsigned lim; 127 128 /* 129 * Convert usbfs_memory_mb to bytes, avoiding overflows. 130 * 0 means use the hard limit (effectively unlimited). 131 */ 132 lim = ACCESS_ONCE(usbfs_memory_mb); 133 if (lim == 0 || lim > (USBFS_XFER_MAX >> 20)) 134 lim = USBFS_XFER_MAX; 135 else 136 lim <<= 20; 137 138 atomic_add(amount, &usbfs_memory_usage); 139 if (atomic_read(&usbfs_memory_usage) <= lim) 140 return 0; 141 atomic_sub(amount, &usbfs_memory_usage); 142 return -ENOMEM; 143 } 144 145 /* Memory for a transfer is being deallocated */ 146 static void usbfs_decrease_memory_usage(unsigned amount) 147 { 148 atomic_sub(amount, &usbfs_memory_usage); 149 } 150 151 static int connected(struct dev_state *ps) 152 { 153 return (!list_empty(&ps->list) && 154 ps->dev->state != USB_STATE_NOTATTACHED); 155 } 156 157 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig) 158 { 159 loff_t ret; 160 161 mutex_lock(&file->f_dentry->d_inode->i_mutex); 162 163 switch (orig) { 164 case 0: 165 file->f_pos = offset; 166 ret = file->f_pos; 167 break; 168 case 1: 169 file->f_pos += offset; 170 ret = file->f_pos; 171 break; 172 case 2: 173 default: 174 ret = -EINVAL; 175 } 176 177 mutex_unlock(&file->f_dentry->d_inode->i_mutex); 178 return ret; 179 } 180 181 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, 182 loff_t *ppos) 183 { 184 struct dev_state *ps = file->private_data; 185 struct usb_device *dev = ps->dev; 186 ssize_t ret = 0; 187 unsigned len; 188 loff_t pos; 189 int i; 190 191 pos = *ppos; 192 usb_lock_device(dev); 193 if (!connected(ps)) { 194 ret = -ENODEV; 195 goto err; 196 } else if (pos < 0) { 197 ret = -EINVAL; 198 goto err; 199 } 200 201 if (pos < sizeof(struct usb_device_descriptor)) { 202 /* 18 bytes - fits on the stack */ 203 struct usb_device_descriptor temp_desc; 204 205 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor)); 206 le16_to_cpus(&temp_desc.bcdUSB); 207 le16_to_cpus(&temp_desc.idVendor); 208 le16_to_cpus(&temp_desc.idProduct); 209 le16_to_cpus(&temp_desc.bcdDevice); 210 211 len = sizeof(struct usb_device_descriptor) - pos; 212 if (len > nbytes) 213 len = nbytes; 214 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) { 215 ret = -EFAULT; 216 goto err; 217 } 218 219 *ppos += len; 220 buf += len; 221 nbytes -= len; 222 ret += len; 223 } 224 225 pos = sizeof(struct usb_device_descriptor); 226 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) { 227 struct usb_config_descriptor *config = 228 (struct usb_config_descriptor *)dev->rawdescriptors[i]; 229 unsigned int length = le16_to_cpu(config->wTotalLength); 230 231 if (*ppos < pos + length) { 232 233 /* The descriptor may claim to be longer than it 234 * really is. Here is the actual allocated length. */ 235 unsigned alloclen = 236 le16_to_cpu(dev->config[i].desc.wTotalLength); 237 238 len = length - (*ppos - pos); 239 if (len > nbytes) 240 len = nbytes; 241 242 /* Simply don't write (skip over) unallocated parts */ 243 if (alloclen > (*ppos - pos)) { 244 alloclen -= (*ppos - pos); 245 if (copy_to_user(buf, 246 dev->rawdescriptors[i] + (*ppos - pos), 247 min(len, alloclen))) { 248 ret = -EFAULT; 249 goto err; 250 } 251 } 252 253 *ppos += len; 254 buf += len; 255 nbytes -= len; 256 ret += len; 257 } 258 259 pos += length; 260 } 261 262 err: 263 usb_unlock_device(dev); 264 return ret; 265 } 266 267 /* 268 * async list handling 269 */ 270 271 static struct async *alloc_async(unsigned int numisoframes) 272 { 273 struct async *as; 274 275 as = kzalloc(sizeof(struct async), GFP_KERNEL); 276 if (!as) 277 return NULL; 278 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL); 279 if (!as->urb) { 280 kfree(as); 281 return NULL; 282 } 283 return as; 284 } 285 286 static void free_async(struct async *as) 287 { 288 put_pid(as->pid); 289 if (as->cred) 290 put_cred(as->cred); 291 kfree(as->urb->transfer_buffer); 292 kfree(as->urb->setup_packet); 293 usb_free_urb(as->urb); 294 usbfs_decrease_memory_usage(as->mem_usage); 295 kfree(as); 296 } 297 298 static void async_newpending(struct async *as) 299 { 300 struct dev_state *ps = as->ps; 301 unsigned long flags; 302 303 spin_lock_irqsave(&ps->lock, flags); 304 list_add_tail(&as->asynclist, &ps->async_pending); 305 spin_unlock_irqrestore(&ps->lock, flags); 306 } 307 308 static void async_removepending(struct async *as) 309 { 310 struct dev_state *ps = as->ps; 311 unsigned long flags; 312 313 spin_lock_irqsave(&ps->lock, flags); 314 list_del_init(&as->asynclist); 315 spin_unlock_irqrestore(&ps->lock, flags); 316 } 317 318 static struct async *async_getcompleted(struct dev_state *ps) 319 { 320 unsigned long flags; 321 struct async *as = NULL; 322 323 spin_lock_irqsave(&ps->lock, flags); 324 if (!list_empty(&ps->async_completed)) { 325 as = list_entry(ps->async_completed.next, struct async, 326 asynclist); 327 list_del_init(&as->asynclist); 328 } 329 spin_unlock_irqrestore(&ps->lock, flags); 330 return as; 331 } 332 333 static struct async *async_getpending(struct dev_state *ps, 334 void __user *userurb) 335 { 336 struct async *as; 337 338 list_for_each_entry(as, &ps->async_pending, asynclist) 339 if (as->userurb == userurb) { 340 list_del_init(&as->asynclist); 341 return as; 342 } 343 344 return NULL; 345 } 346 347 static void snoop_urb(struct usb_device *udev, 348 void __user *userurb, int pipe, unsigned length, 349 int timeout_or_status, enum snoop_when when, 350 unsigned char *data, unsigned data_len) 351 { 352 static const char *types[] = {"isoc", "int", "ctrl", "bulk"}; 353 static const char *dirs[] = {"out", "in"}; 354 int ep; 355 const char *t, *d; 356 357 if (!usbfs_snoop) 358 return; 359 360 ep = usb_pipeendpoint(pipe); 361 t = types[usb_pipetype(pipe)]; 362 d = dirs[!!usb_pipein(pipe)]; 363 364 if (userurb) { /* Async */ 365 if (when == SUBMIT) 366 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, " 367 "length %u\n", 368 userurb, ep, t, d, length); 369 else 370 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, " 371 "actual_length %u status %d\n", 372 userurb, ep, t, d, length, 373 timeout_or_status); 374 } else { 375 if (when == SUBMIT) 376 dev_info(&udev->dev, "ep%d %s-%s, length %u, " 377 "timeout %d\n", 378 ep, t, d, length, timeout_or_status); 379 else 380 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, " 381 "status %d\n", 382 ep, t, d, length, timeout_or_status); 383 } 384 385 if (data && data_len > 0) { 386 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1, 387 data, data_len, 1); 388 } 389 } 390 391 #define AS_CONTINUATION 1 392 #define AS_UNLINK 2 393 394 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr) 395 __releases(ps->lock) 396 __acquires(ps->lock) 397 { 398 struct urb *urb; 399 struct async *as; 400 401 /* Mark all the pending URBs that match bulk_addr, up to but not 402 * including the first one without AS_CONTINUATION. If such an 403 * URB is encountered then a new transfer has already started so 404 * the endpoint doesn't need to be disabled; otherwise it does. 405 */ 406 list_for_each_entry(as, &ps->async_pending, asynclist) { 407 if (as->bulk_addr == bulk_addr) { 408 if (as->bulk_status != AS_CONTINUATION) 409 goto rescan; 410 as->bulk_status = AS_UNLINK; 411 as->bulk_addr = 0; 412 } 413 } 414 ps->disabled_bulk_eps |= (1 << bulk_addr); 415 416 /* Now carefully unlink all the marked pending URBs */ 417 rescan: 418 list_for_each_entry(as, &ps->async_pending, asynclist) { 419 if (as->bulk_status == AS_UNLINK) { 420 as->bulk_status = 0; /* Only once */ 421 urb = as->urb; 422 usb_get_urb(urb); 423 spin_unlock(&ps->lock); /* Allow completions */ 424 usb_unlink_urb(urb); 425 usb_put_urb(urb); 426 spin_lock(&ps->lock); 427 goto rescan; 428 } 429 } 430 } 431 432 static void async_completed(struct urb *urb) 433 { 434 struct async *as = urb->context; 435 struct dev_state *ps = as->ps; 436 struct siginfo sinfo; 437 struct pid *pid = NULL; 438 u32 secid = 0; 439 const struct cred *cred = NULL; 440 int signr; 441 442 spin_lock(&ps->lock); 443 list_move_tail(&as->asynclist, &ps->async_completed); 444 as->status = urb->status; 445 signr = as->signr; 446 if (signr) { 447 sinfo.si_signo = as->signr; 448 sinfo.si_errno = as->status; 449 sinfo.si_code = SI_ASYNCIO; 450 sinfo.si_addr = as->userurb; 451 pid = get_pid(as->pid); 452 cred = get_cred(as->cred); 453 secid = as->secid; 454 } 455 snoop(&urb->dev->dev, "urb complete\n"); 456 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length, 457 as->status, COMPLETE, 458 ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_OUT) ? 459 NULL : urb->transfer_buffer, urb->actual_length); 460 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET && 461 as->status != -ENOENT) 462 cancel_bulk_urbs(ps, as->bulk_addr); 463 spin_unlock(&ps->lock); 464 465 if (signr) { 466 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid); 467 put_pid(pid); 468 put_cred(cred); 469 } 470 471 wake_up(&ps->wait); 472 } 473 474 static void destroy_async(struct dev_state *ps, struct list_head *list) 475 { 476 struct urb *urb; 477 struct async *as; 478 unsigned long flags; 479 480 spin_lock_irqsave(&ps->lock, flags); 481 while (!list_empty(list)) { 482 as = list_entry(list->next, struct async, asynclist); 483 list_del_init(&as->asynclist); 484 urb = as->urb; 485 usb_get_urb(urb); 486 487 /* drop the spinlock so the completion handler can run */ 488 spin_unlock_irqrestore(&ps->lock, flags); 489 usb_kill_urb(urb); 490 usb_put_urb(urb); 491 spin_lock_irqsave(&ps->lock, flags); 492 } 493 spin_unlock_irqrestore(&ps->lock, flags); 494 } 495 496 static void destroy_async_on_interface(struct dev_state *ps, 497 unsigned int ifnum) 498 { 499 struct list_head *p, *q, hitlist; 500 unsigned long flags; 501 502 INIT_LIST_HEAD(&hitlist); 503 spin_lock_irqsave(&ps->lock, flags); 504 list_for_each_safe(p, q, &ps->async_pending) 505 if (ifnum == list_entry(p, struct async, asynclist)->ifnum) 506 list_move_tail(p, &hitlist); 507 spin_unlock_irqrestore(&ps->lock, flags); 508 destroy_async(ps, &hitlist); 509 } 510 511 static void destroy_all_async(struct dev_state *ps) 512 { 513 destroy_async(ps, &ps->async_pending); 514 } 515 516 /* 517 * interface claims are made only at the request of user level code, 518 * which can also release them (explicitly or by closing files). 519 * they're also undone when devices disconnect. 520 */ 521 522 static int driver_probe(struct usb_interface *intf, 523 const struct usb_device_id *id) 524 { 525 return -ENODEV; 526 } 527 528 static void driver_disconnect(struct usb_interface *intf) 529 { 530 struct dev_state *ps = usb_get_intfdata(intf); 531 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber; 532 533 if (!ps) 534 return; 535 536 /* NOTE: this relies on usbcore having canceled and completed 537 * all pending I/O requests; 2.6 does that. 538 */ 539 540 if (likely(ifnum < 8*sizeof(ps->ifclaimed))) 541 clear_bit(ifnum, &ps->ifclaimed); 542 else 543 dev_warn(&intf->dev, "interface number %u out of range\n", 544 ifnum); 545 546 usb_set_intfdata(intf, NULL); 547 548 /* force async requests to complete */ 549 destroy_async_on_interface(ps, ifnum); 550 } 551 552 /* The following routines are merely placeholders. There is no way 553 * to inform a user task about suspend or resumes. 554 */ 555 static int driver_suspend(struct usb_interface *intf, pm_message_t msg) 556 { 557 return 0; 558 } 559 560 static int driver_resume(struct usb_interface *intf) 561 { 562 return 0; 563 } 564 565 struct usb_driver usbfs_driver = { 566 .name = "usbfs", 567 .probe = driver_probe, 568 .disconnect = driver_disconnect, 569 .suspend = driver_suspend, 570 .resume = driver_resume, 571 }; 572 573 static int claimintf(struct dev_state *ps, unsigned int ifnum) 574 { 575 struct usb_device *dev = ps->dev; 576 struct usb_interface *intf; 577 int err; 578 579 if (ifnum >= 8*sizeof(ps->ifclaimed)) 580 return -EINVAL; 581 /* already claimed */ 582 if (test_bit(ifnum, &ps->ifclaimed)) 583 return 0; 584 585 intf = usb_ifnum_to_if(dev, ifnum); 586 if (!intf) 587 err = -ENOENT; 588 else 589 err = usb_driver_claim_interface(&usbfs_driver, intf, ps); 590 if (err == 0) 591 set_bit(ifnum, &ps->ifclaimed); 592 return err; 593 } 594 595 static int releaseintf(struct dev_state *ps, unsigned int ifnum) 596 { 597 struct usb_device *dev; 598 struct usb_interface *intf; 599 int err; 600 601 err = -EINVAL; 602 if (ifnum >= 8*sizeof(ps->ifclaimed)) 603 return err; 604 dev = ps->dev; 605 intf = usb_ifnum_to_if(dev, ifnum); 606 if (!intf) 607 err = -ENOENT; 608 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) { 609 usb_driver_release_interface(&usbfs_driver, intf); 610 err = 0; 611 } 612 return err; 613 } 614 615 static int checkintf(struct dev_state *ps, unsigned int ifnum) 616 { 617 if (ps->dev->state != USB_STATE_CONFIGURED) 618 return -EHOSTUNREACH; 619 if (ifnum >= 8*sizeof(ps->ifclaimed)) 620 return -EINVAL; 621 if (test_bit(ifnum, &ps->ifclaimed)) 622 return 0; 623 /* if not yet claimed, claim it for the driver */ 624 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim " 625 "interface %u before use\n", task_pid_nr(current), 626 current->comm, ifnum); 627 return claimintf(ps, ifnum); 628 } 629 630 static int findintfep(struct usb_device *dev, unsigned int ep) 631 { 632 unsigned int i, j, e; 633 struct usb_interface *intf; 634 struct usb_host_interface *alts; 635 struct usb_endpoint_descriptor *endpt; 636 637 if (ep & ~(USB_DIR_IN|0xf)) 638 return -EINVAL; 639 if (!dev->actconfig) 640 return -ESRCH; 641 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { 642 intf = dev->actconfig->interface[i]; 643 for (j = 0; j < intf->num_altsetting; j++) { 644 alts = &intf->altsetting[j]; 645 for (e = 0; e < alts->desc.bNumEndpoints; e++) { 646 endpt = &alts->endpoint[e].desc; 647 if (endpt->bEndpointAddress == ep) 648 return alts->desc.bInterfaceNumber; 649 } 650 } 651 } 652 return -ENOENT; 653 } 654 655 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, 656 unsigned int request, unsigned int index) 657 { 658 int ret = 0; 659 struct usb_host_interface *alt_setting; 660 661 if (ps->dev->state != USB_STATE_UNAUTHENTICATED 662 && ps->dev->state != USB_STATE_ADDRESS 663 && ps->dev->state != USB_STATE_CONFIGURED) 664 return -EHOSTUNREACH; 665 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype)) 666 return 0; 667 668 /* 669 * check for the special corner case 'get_device_id' in the printer 670 * class specification, where wIndex is (interface << 8 | altsetting) 671 * instead of just interface 672 */ 673 if (requesttype == 0xa1 && request == 0) { 674 alt_setting = usb_find_alt_setting(ps->dev->actconfig, 675 index >> 8, index & 0xff); 676 if (alt_setting 677 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER) 678 index >>= 8; 679 } 680 681 index &= 0xff; 682 switch (requesttype & USB_RECIP_MASK) { 683 case USB_RECIP_ENDPOINT: 684 ret = findintfep(ps->dev, index); 685 if (ret >= 0) 686 ret = checkintf(ps, ret); 687 break; 688 689 case USB_RECIP_INTERFACE: 690 ret = checkintf(ps, index); 691 break; 692 } 693 return ret; 694 } 695 696 static int match_devt(struct device *dev, void *data) 697 { 698 return dev->devt == (dev_t) (unsigned long) data; 699 } 700 701 static struct usb_device *usbdev_lookup_by_devt(dev_t devt) 702 { 703 struct device *dev; 704 705 dev = bus_find_device(&usb_bus_type, NULL, 706 (void *) (unsigned long) devt, match_devt); 707 if (!dev) 708 return NULL; 709 return container_of(dev, struct usb_device, dev); 710 } 711 712 /* 713 * file operations 714 */ 715 static int usbdev_open(struct inode *inode, struct file *file) 716 { 717 struct usb_device *dev = NULL; 718 struct dev_state *ps; 719 int ret; 720 721 ret = -ENOMEM; 722 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL); 723 if (!ps) 724 goto out_free_ps; 725 726 ret = -ENODEV; 727 728 /* Protect against simultaneous removal or release */ 729 mutex_lock(&usbfs_mutex); 730 731 /* usbdev device-node */ 732 if (imajor(inode) == USB_DEVICE_MAJOR) 733 dev = usbdev_lookup_by_devt(inode->i_rdev); 734 735 mutex_unlock(&usbfs_mutex); 736 737 if (!dev) 738 goto out_free_ps; 739 740 usb_lock_device(dev); 741 if (dev->state == USB_STATE_NOTATTACHED) 742 goto out_unlock_device; 743 744 ret = usb_autoresume_device(dev); 745 if (ret) 746 goto out_unlock_device; 747 748 ps->dev = dev; 749 ps->file = file; 750 spin_lock_init(&ps->lock); 751 INIT_LIST_HEAD(&ps->list); 752 INIT_LIST_HEAD(&ps->async_pending); 753 INIT_LIST_HEAD(&ps->async_completed); 754 init_waitqueue_head(&ps->wait); 755 ps->discsignr = 0; 756 ps->disc_pid = get_pid(task_pid(current)); 757 ps->cred = get_current_cred(); 758 ps->disccontext = NULL; 759 ps->ifclaimed = 0; 760 security_task_getsecid(current, &ps->secid); 761 smp_wmb(); 762 list_add_tail(&ps->list, &dev->filelist); 763 file->private_data = ps; 764 usb_unlock_device(dev); 765 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current), 766 current->comm); 767 return ret; 768 769 out_unlock_device: 770 usb_unlock_device(dev); 771 usb_put_dev(dev); 772 out_free_ps: 773 kfree(ps); 774 return ret; 775 } 776 777 static int usbdev_release(struct inode *inode, struct file *file) 778 { 779 struct dev_state *ps = file->private_data; 780 struct usb_device *dev = ps->dev; 781 unsigned int ifnum; 782 struct async *as; 783 784 usb_lock_device(dev); 785 usb_hub_release_all_ports(dev, ps); 786 787 list_del_init(&ps->list); 788 789 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed); 790 ifnum++) { 791 if (test_bit(ifnum, &ps->ifclaimed)) 792 releaseintf(ps, ifnum); 793 } 794 destroy_all_async(ps); 795 usb_autosuspend_device(dev); 796 usb_unlock_device(dev); 797 usb_put_dev(dev); 798 put_pid(ps->disc_pid); 799 put_cred(ps->cred); 800 801 as = async_getcompleted(ps); 802 while (as) { 803 free_async(as); 804 as = async_getcompleted(ps); 805 } 806 kfree(ps); 807 return 0; 808 } 809 810 static int proc_control(struct dev_state *ps, void __user *arg) 811 { 812 struct usb_device *dev = ps->dev; 813 struct usbdevfs_ctrltransfer ctrl; 814 unsigned int tmo; 815 unsigned char *tbuf; 816 unsigned wLength; 817 int i, pipe, ret; 818 819 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 820 return -EFAULT; 821 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest, 822 ctrl.wIndex); 823 if (ret) 824 return ret; 825 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */ 826 if (wLength > PAGE_SIZE) 827 return -EINVAL; 828 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) + 829 sizeof(struct usb_ctrlrequest)); 830 if (ret) 831 return ret; 832 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL); 833 if (!tbuf) { 834 ret = -ENOMEM; 835 goto done; 836 } 837 tmo = ctrl.timeout; 838 snoop(&dev->dev, "control urb: bRequestType=%02x " 839 "bRequest=%02x wValue=%04x " 840 "wIndex=%04x wLength=%04x\n", 841 ctrl.bRequestType, ctrl.bRequest, 842 __le16_to_cpup(&ctrl.wValue), 843 __le16_to_cpup(&ctrl.wIndex), 844 __le16_to_cpup(&ctrl.wLength)); 845 if (ctrl.bRequestType & 0x80) { 846 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, 847 ctrl.wLength)) { 848 ret = -EINVAL; 849 goto done; 850 } 851 pipe = usb_rcvctrlpipe(dev, 0); 852 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0); 853 854 usb_unlock_device(dev); 855 i = usb_control_msg(dev, pipe, ctrl.bRequest, 856 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 857 tbuf, ctrl.wLength, tmo); 858 usb_lock_device(dev); 859 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, 860 tbuf, max(i, 0)); 861 if ((i > 0) && ctrl.wLength) { 862 if (copy_to_user(ctrl.data, tbuf, i)) { 863 ret = -EFAULT; 864 goto done; 865 } 866 } 867 } else { 868 if (ctrl.wLength) { 869 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) { 870 ret = -EFAULT; 871 goto done; 872 } 873 } 874 pipe = usb_sndctrlpipe(dev, 0); 875 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, 876 tbuf, ctrl.wLength); 877 878 usb_unlock_device(dev); 879 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, 880 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 881 tbuf, ctrl.wLength, tmo); 882 usb_lock_device(dev); 883 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0); 884 } 885 if (i < 0 && i != -EPIPE) { 886 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL " 887 "failed cmd %s rqt %u rq %u len %u ret %d\n", 888 current->comm, ctrl.bRequestType, ctrl.bRequest, 889 ctrl.wLength, i); 890 } 891 ret = i; 892 done: 893 free_page((unsigned long) tbuf); 894 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) + 895 sizeof(struct usb_ctrlrequest)); 896 return ret; 897 } 898 899 static int proc_bulk(struct dev_state *ps, void __user *arg) 900 { 901 struct usb_device *dev = ps->dev; 902 struct usbdevfs_bulktransfer bulk; 903 unsigned int tmo, len1, pipe; 904 int len2; 905 unsigned char *tbuf; 906 int i, ret; 907 908 if (copy_from_user(&bulk, arg, sizeof(bulk))) 909 return -EFAULT; 910 ret = findintfep(ps->dev, bulk.ep); 911 if (ret < 0) 912 return ret; 913 ret = checkintf(ps, ret); 914 if (ret) 915 return ret; 916 if (bulk.ep & USB_DIR_IN) 917 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f); 918 else 919 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f); 920 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN))) 921 return -EINVAL; 922 len1 = bulk.len; 923 if (len1 >= USBFS_XFER_MAX) 924 return -EINVAL; 925 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb)); 926 if (ret) 927 return ret; 928 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) { 929 ret = -ENOMEM; 930 goto done; 931 } 932 tmo = bulk.timeout; 933 if (bulk.ep & 0x80) { 934 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) { 935 ret = -EINVAL; 936 goto done; 937 } 938 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0); 939 940 usb_unlock_device(dev); 941 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 942 usb_lock_device(dev); 943 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2); 944 945 if (!i && len2) { 946 if (copy_to_user(bulk.data, tbuf, len2)) { 947 ret = -EFAULT; 948 goto done; 949 } 950 } 951 } else { 952 if (len1) { 953 if (copy_from_user(tbuf, bulk.data, len1)) { 954 ret = -EFAULT; 955 goto done; 956 } 957 } 958 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1); 959 960 usb_unlock_device(dev); 961 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 962 usb_lock_device(dev); 963 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0); 964 } 965 ret = (i < 0 ? i : len2); 966 done: 967 kfree(tbuf); 968 usbfs_decrease_memory_usage(len1 + sizeof(struct urb)); 969 return ret; 970 } 971 972 static int proc_resetep(struct dev_state *ps, void __user *arg) 973 { 974 unsigned int ep; 975 int ret; 976 977 if (get_user(ep, (unsigned int __user *)arg)) 978 return -EFAULT; 979 ret = findintfep(ps->dev, ep); 980 if (ret < 0) 981 return ret; 982 ret = checkintf(ps, ret); 983 if (ret) 984 return ret; 985 usb_reset_endpoint(ps->dev, ep); 986 return 0; 987 } 988 989 static int proc_clearhalt(struct dev_state *ps, void __user *arg) 990 { 991 unsigned int ep; 992 int pipe; 993 int ret; 994 995 if (get_user(ep, (unsigned int __user *)arg)) 996 return -EFAULT; 997 ret = findintfep(ps->dev, ep); 998 if (ret < 0) 999 return ret; 1000 ret = checkintf(ps, ret); 1001 if (ret) 1002 return ret; 1003 if (ep & USB_DIR_IN) 1004 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f); 1005 else 1006 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f); 1007 1008 return usb_clear_halt(ps->dev, pipe); 1009 } 1010 1011 static int proc_getdriver(struct dev_state *ps, void __user *arg) 1012 { 1013 struct usbdevfs_getdriver gd; 1014 struct usb_interface *intf; 1015 int ret; 1016 1017 if (copy_from_user(&gd, arg, sizeof(gd))) 1018 return -EFAULT; 1019 intf = usb_ifnum_to_if(ps->dev, gd.interface); 1020 if (!intf || !intf->dev.driver) 1021 ret = -ENODATA; 1022 else { 1023 strncpy(gd.driver, intf->dev.driver->name, 1024 sizeof(gd.driver)); 1025 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0); 1026 } 1027 return ret; 1028 } 1029 1030 static int proc_connectinfo(struct dev_state *ps, void __user *arg) 1031 { 1032 struct usbdevfs_connectinfo ci = { 1033 .devnum = ps->dev->devnum, 1034 .slow = ps->dev->speed == USB_SPEED_LOW 1035 }; 1036 1037 if (copy_to_user(arg, &ci, sizeof(ci))) 1038 return -EFAULT; 1039 return 0; 1040 } 1041 1042 static int proc_resetdevice(struct dev_state *ps) 1043 { 1044 return usb_reset_device(ps->dev); 1045 } 1046 1047 static int proc_setintf(struct dev_state *ps, void __user *arg) 1048 { 1049 struct usbdevfs_setinterface setintf; 1050 int ret; 1051 1052 if (copy_from_user(&setintf, arg, sizeof(setintf))) 1053 return -EFAULT; 1054 if ((ret = checkintf(ps, setintf.interface))) 1055 return ret; 1056 return usb_set_interface(ps->dev, setintf.interface, 1057 setintf.altsetting); 1058 } 1059 1060 static int proc_setconfig(struct dev_state *ps, void __user *arg) 1061 { 1062 int u; 1063 int status = 0; 1064 struct usb_host_config *actconfig; 1065 1066 if (get_user(u, (int __user *)arg)) 1067 return -EFAULT; 1068 1069 actconfig = ps->dev->actconfig; 1070 1071 /* Don't touch the device if any interfaces are claimed. 1072 * It could interfere with other drivers' operations, and if 1073 * an interface is claimed by usbfs it could easily deadlock. 1074 */ 1075 if (actconfig) { 1076 int i; 1077 1078 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) { 1079 if (usb_interface_claimed(actconfig->interface[i])) { 1080 dev_warn(&ps->dev->dev, 1081 "usbfs: interface %d claimed by %s " 1082 "while '%s' sets config #%d\n", 1083 actconfig->interface[i] 1084 ->cur_altsetting 1085 ->desc.bInterfaceNumber, 1086 actconfig->interface[i] 1087 ->dev.driver->name, 1088 current->comm, u); 1089 status = -EBUSY; 1090 break; 1091 } 1092 } 1093 } 1094 1095 /* SET_CONFIGURATION is often abused as a "cheap" driver reset, 1096 * so avoid usb_set_configuration()'s kick to sysfs 1097 */ 1098 if (status == 0) { 1099 if (actconfig && actconfig->desc.bConfigurationValue == u) 1100 status = usb_reset_configuration(ps->dev); 1101 else 1102 status = usb_set_configuration(ps->dev, u); 1103 } 1104 1105 return status; 1106 } 1107 1108 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb, 1109 struct usbdevfs_iso_packet_desc __user *iso_frame_desc, 1110 void __user *arg) 1111 { 1112 struct usbdevfs_iso_packet_desc *isopkt = NULL; 1113 struct usb_host_endpoint *ep; 1114 struct async *as = NULL; 1115 struct usb_ctrlrequest *dr = NULL; 1116 unsigned int u, totlen, isofrmlen; 1117 int ret, ifnum = -1; 1118 int is_in; 1119 1120 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP | 1121 USBDEVFS_URB_SHORT_NOT_OK | 1122 USBDEVFS_URB_BULK_CONTINUATION | 1123 USBDEVFS_URB_NO_FSBR | 1124 USBDEVFS_URB_ZERO_PACKET | 1125 USBDEVFS_URB_NO_INTERRUPT)) 1126 return -EINVAL; 1127 if (uurb->buffer_length > 0 && !uurb->buffer) 1128 return -EINVAL; 1129 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && 1130 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) { 1131 ifnum = findintfep(ps->dev, uurb->endpoint); 1132 if (ifnum < 0) 1133 return ifnum; 1134 ret = checkintf(ps, ifnum); 1135 if (ret) 1136 return ret; 1137 } 1138 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) { 1139 is_in = 1; 1140 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 1141 } else { 1142 is_in = 0; 1143 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 1144 } 1145 if (!ep) 1146 return -ENOENT; 1147 1148 u = 0; 1149 switch(uurb->type) { 1150 case USBDEVFS_URB_TYPE_CONTROL: 1151 if (!usb_endpoint_xfer_control(&ep->desc)) 1152 return -EINVAL; 1153 /* min 8 byte setup packet */ 1154 if (uurb->buffer_length < 8) 1155 return -EINVAL; 1156 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); 1157 if (!dr) 1158 return -ENOMEM; 1159 if (copy_from_user(dr, uurb->buffer, 8)) { 1160 ret = -EFAULT; 1161 goto error; 1162 } 1163 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) { 1164 ret = -EINVAL; 1165 goto error; 1166 } 1167 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest, 1168 le16_to_cpup(&dr->wIndex)); 1169 if (ret) 1170 goto error; 1171 uurb->number_of_packets = 0; 1172 uurb->buffer_length = le16_to_cpup(&dr->wLength); 1173 uurb->buffer += 8; 1174 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) { 1175 is_in = 1; 1176 uurb->endpoint |= USB_DIR_IN; 1177 } else { 1178 is_in = 0; 1179 uurb->endpoint &= ~USB_DIR_IN; 1180 } 1181 snoop(&ps->dev->dev, "control urb: bRequestType=%02x " 1182 "bRequest=%02x wValue=%04x " 1183 "wIndex=%04x wLength=%04x\n", 1184 dr->bRequestType, dr->bRequest, 1185 __le16_to_cpup(&dr->wValue), 1186 __le16_to_cpup(&dr->wIndex), 1187 __le16_to_cpup(&dr->wLength)); 1188 u = sizeof(struct usb_ctrlrequest); 1189 break; 1190 1191 case USBDEVFS_URB_TYPE_BULK: 1192 switch (usb_endpoint_type(&ep->desc)) { 1193 case USB_ENDPOINT_XFER_CONTROL: 1194 case USB_ENDPOINT_XFER_ISOC: 1195 return -EINVAL; 1196 case USB_ENDPOINT_XFER_INT: 1197 /* allow single-shot interrupt transfers */ 1198 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT; 1199 goto interrupt_urb; 1200 } 1201 uurb->number_of_packets = 0; 1202 break; 1203 1204 case USBDEVFS_URB_TYPE_INTERRUPT: 1205 if (!usb_endpoint_xfer_int(&ep->desc)) 1206 return -EINVAL; 1207 interrupt_urb: 1208 uurb->number_of_packets = 0; 1209 break; 1210 1211 case USBDEVFS_URB_TYPE_ISO: 1212 /* arbitrary limit */ 1213 if (uurb->number_of_packets < 1 || 1214 uurb->number_of_packets > 128) 1215 return -EINVAL; 1216 if (!usb_endpoint_xfer_isoc(&ep->desc)) 1217 return -EINVAL; 1218 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * 1219 uurb->number_of_packets; 1220 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL))) 1221 return -ENOMEM; 1222 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) { 1223 ret = -EFAULT; 1224 goto error; 1225 } 1226 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1227 /* arbitrary limit, 1228 * sufficient for USB 2.0 high-bandwidth iso */ 1229 if (isopkt[u].length > 8192) { 1230 ret = -EINVAL; 1231 goto error; 1232 } 1233 totlen += isopkt[u].length; 1234 } 1235 u *= sizeof(struct usb_iso_packet_descriptor); 1236 uurb->buffer_length = totlen; 1237 break; 1238 1239 default: 1240 return -EINVAL; 1241 } 1242 1243 if (uurb->buffer_length >= USBFS_XFER_MAX) { 1244 ret = -EINVAL; 1245 goto error; 1246 } 1247 if (uurb->buffer_length > 0 && 1248 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1249 uurb->buffer, uurb->buffer_length)) { 1250 ret = -EFAULT; 1251 goto error; 1252 } 1253 as = alloc_async(uurb->number_of_packets); 1254 if (!as) { 1255 ret = -ENOMEM; 1256 goto error; 1257 } 1258 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length; 1259 ret = usbfs_increase_memory_usage(u); 1260 if (ret) 1261 goto error; 1262 as->mem_usage = u; 1263 1264 if (uurb->buffer_length > 0) { 1265 as->urb->transfer_buffer = kmalloc(uurb->buffer_length, 1266 GFP_KERNEL); 1267 if (!as->urb->transfer_buffer) { 1268 ret = -ENOMEM; 1269 goto error; 1270 } 1271 /* Isochronous input data may end up being discontiguous 1272 * if some of the packets are short. Clear the buffer so 1273 * that the gaps don't leak kernel data to userspace. 1274 */ 1275 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO) 1276 memset(as->urb->transfer_buffer, 0, 1277 uurb->buffer_length); 1278 } 1279 as->urb->dev = ps->dev; 1280 as->urb->pipe = (uurb->type << 30) | 1281 __create_pipe(ps->dev, uurb->endpoint & 0xf) | 1282 (uurb->endpoint & USB_DIR_IN); 1283 1284 /* This tedious sequence is necessary because the URB_* flags 1285 * are internal to the kernel and subject to change, whereas 1286 * the USBDEVFS_URB_* flags are a user API and must not be changed. 1287 */ 1288 u = (is_in ? URB_DIR_IN : URB_DIR_OUT); 1289 if (uurb->flags & USBDEVFS_URB_ISO_ASAP) 1290 u |= URB_ISO_ASAP; 1291 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK) 1292 u |= URB_SHORT_NOT_OK; 1293 if (uurb->flags & USBDEVFS_URB_NO_FSBR) 1294 u |= URB_NO_FSBR; 1295 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET) 1296 u |= URB_ZERO_PACKET; 1297 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT) 1298 u |= URB_NO_INTERRUPT; 1299 as->urb->transfer_flags = u; 1300 1301 as->urb->transfer_buffer_length = uurb->buffer_length; 1302 as->urb->setup_packet = (unsigned char *)dr; 1303 dr = NULL; 1304 as->urb->start_frame = uurb->start_frame; 1305 as->urb->number_of_packets = uurb->number_of_packets; 1306 if (uurb->type == USBDEVFS_URB_TYPE_ISO || 1307 ps->dev->speed == USB_SPEED_HIGH) 1308 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1); 1309 else 1310 as->urb->interval = ep->desc.bInterval; 1311 as->urb->context = as; 1312 as->urb->complete = async_completed; 1313 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1314 as->urb->iso_frame_desc[u].offset = totlen; 1315 as->urb->iso_frame_desc[u].length = isopkt[u].length; 1316 totlen += isopkt[u].length; 1317 } 1318 kfree(isopkt); 1319 isopkt = NULL; 1320 as->ps = ps; 1321 as->userurb = arg; 1322 if (is_in && uurb->buffer_length > 0) 1323 as->userbuffer = uurb->buffer; 1324 else 1325 as->userbuffer = NULL; 1326 as->signr = uurb->signr; 1327 as->ifnum = ifnum; 1328 as->pid = get_pid(task_pid(current)); 1329 as->cred = get_current_cred(); 1330 security_task_getsecid(current, &as->secid); 1331 if (!is_in && uurb->buffer_length > 0) { 1332 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, 1333 uurb->buffer_length)) { 1334 ret = -EFAULT; 1335 goto error; 1336 } 1337 } 1338 snoop_urb(ps->dev, as->userurb, as->urb->pipe, 1339 as->urb->transfer_buffer_length, 0, SUBMIT, 1340 is_in ? NULL : as->urb->transfer_buffer, 1341 uurb->buffer_length); 1342 async_newpending(as); 1343 1344 if (usb_endpoint_xfer_bulk(&ep->desc)) { 1345 spin_lock_irq(&ps->lock); 1346 1347 /* Not exactly the endpoint address; the direction bit is 1348 * shifted to the 0x10 position so that the value will be 1349 * between 0 and 31. 1350 */ 1351 as->bulk_addr = usb_endpoint_num(&ep->desc) | 1352 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK) 1353 >> 3); 1354 1355 /* If this bulk URB is the start of a new transfer, re-enable 1356 * the endpoint. Otherwise mark it as a continuation URB. 1357 */ 1358 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION) 1359 as->bulk_status = AS_CONTINUATION; 1360 else 1361 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr); 1362 1363 /* Don't accept continuation URBs if the endpoint is 1364 * disabled because of an earlier error. 1365 */ 1366 if (ps->disabled_bulk_eps & (1 << as->bulk_addr)) 1367 ret = -EREMOTEIO; 1368 else 1369 ret = usb_submit_urb(as->urb, GFP_ATOMIC); 1370 spin_unlock_irq(&ps->lock); 1371 } else { 1372 ret = usb_submit_urb(as->urb, GFP_KERNEL); 1373 } 1374 1375 if (ret) { 1376 dev_printk(KERN_DEBUG, &ps->dev->dev, 1377 "usbfs: usb_submit_urb returned %d\n", ret); 1378 snoop_urb(ps->dev, as->userurb, as->urb->pipe, 1379 0, ret, COMPLETE, NULL, 0); 1380 async_removepending(as); 1381 goto error; 1382 } 1383 return 0; 1384 1385 error: 1386 kfree(isopkt); 1387 kfree(dr); 1388 if (as) 1389 free_async(as); 1390 return ret; 1391 } 1392 1393 static int proc_submiturb(struct dev_state *ps, void __user *arg) 1394 { 1395 struct usbdevfs_urb uurb; 1396 1397 if (copy_from_user(&uurb, arg, sizeof(uurb))) 1398 return -EFAULT; 1399 1400 return proc_do_submiturb(ps, &uurb, 1401 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), 1402 arg); 1403 } 1404 1405 static int proc_unlinkurb(struct dev_state *ps, void __user *arg) 1406 { 1407 struct urb *urb; 1408 struct async *as; 1409 unsigned long flags; 1410 1411 spin_lock_irqsave(&ps->lock, flags); 1412 as = async_getpending(ps, arg); 1413 if (!as) { 1414 spin_unlock_irqrestore(&ps->lock, flags); 1415 return -EINVAL; 1416 } 1417 1418 urb = as->urb; 1419 usb_get_urb(urb); 1420 spin_unlock_irqrestore(&ps->lock, flags); 1421 1422 usb_kill_urb(urb); 1423 usb_put_urb(urb); 1424 1425 return 0; 1426 } 1427 1428 static int processcompl(struct async *as, void __user * __user *arg) 1429 { 1430 struct urb *urb = as->urb; 1431 struct usbdevfs_urb __user *userurb = as->userurb; 1432 void __user *addr = as->userurb; 1433 unsigned int i; 1434 1435 if (as->userbuffer && urb->actual_length) { 1436 if (urb->number_of_packets > 0) /* Isochronous */ 1437 i = urb->transfer_buffer_length; 1438 else /* Non-Isoc */ 1439 i = urb->actual_length; 1440 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i)) 1441 goto err_out; 1442 } 1443 if (put_user(as->status, &userurb->status)) 1444 goto err_out; 1445 if (put_user(urb->actual_length, &userurb->actual_length)) 1446 goto err_out; 1447 if (put_user(urb->error_count, &userurb->error_count)) 1448 goto err_out; 1449 1450 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1451 for (i = 0; i < urb->number_of_packets; i++) { 1452 if (put_user(urb->iso_frame_desc[i].actual_length, 1453 &userurb->iso_frame_desc[i].actual_length)) 1454 goto err_out; 1455 if (put_user(urb->iso_frame_desc[i].status, 1456 &userurb->iso_frame_desc[i].status)) 1457 goto err_out; 1458 } 1459 } 1460 1461 if (put_user(addr, (void __user * __user *)arg)) 1462 return -EFAULT; 1463 return 0; 1464 1465 err_out: 1466 return -EFAULT; 1467 } 1468 1469 static struct async *reap_as(struct dev_state *ps) 1470 { 1471 DECLARE_WAITQUEUE(wait, current); 1472 struct async *as = NULL; 1473 struct usb_device *dev = ps->dev; 1474 1475 add_wait_queue(&ps->wait, &wait); 1476 for (;;) { 1477 __set_current_state(TASK_INTERRUPTIBLE); 1478 as = async_getcompleted(ps); 1479 if (as) 1480 break; 1481 if (signal_pending(current)) 1482 break; 1483 usb_unlock_device(dev); 1484 schedule(); 1485 usb_lock_device(dev); 1486 } 1487 remove_wait_queue(&ps->wait, &wait); 1488 set_current_state(TASK_RUNNING); 1489 return as; 1490 } 1491 1492 static int proc_reapurb(struct dev_state *ps, void __user *arg) 1493 { 1494 struct async *as = reap_as(ps); 1495 if (as) { 1496 int retval = processcompl(as, (void __user * __user *)arg); 1497 free_async(as); 1498 return retval; 1499 } 1500 if (signal_pending(current)) 1501 return -EINTR; 1502 return -EIO; 1503 } 1504 1505 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg) 1506 { 1507 int retval; 1508 struct async *as; 1509 1510 as = async_getcompleted(ps); 1511 retval = -EAGAIN; 1512 if (as) { 1513 retval = processcompl(as, (void __user * __user *)arg); 1514 free_async(as); 1515 } 1516 return retval; 1517 } 1518 1519 #ifdef CONFIG_COMPAT 1520 static int proc_control_compat(struct dev_state *ps, 1521 struct usbdevfs_ctrltransfer32 __user *p32) 1522 { 1523 struct usbdevfs_ctrltransfer __user *p; 1524 __u32 udata; 1525 p = compat_alloc_user_space(sizeof(*p)); 1526 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) || 1527 get_user(udata, &p32->data) || 1528 put_user(compat_ptr(udata), &p->data)) 1529 return -EFAULT; 1530 return proc_control(ps, p); 1531 } 1532 1533 static int proc_bulk_compat(struct dev_state *ps, 1534 struct usbdevfs_bulktransfer32 __user *p32) 1535 { 1536 struct usbdevfs_bulktransfer __user *p; 1537 compat_uint_t n; 1538 compat_caddr_t addr; 1539 1540 p = compat_alloc_user_space(sizeof(*p)); 1541 1542 if (get_user(n, &p32->ep) || put_user(n, &p->ep) || 1543 get_user(n, &p32->len) || put_user(n, &p->len) || 1544 get_user(n, &p32->timeout) || put_user(n, &p->timeout) || 1545 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data)) 1546 return -EFAULT; 1547 1548 return proc_bulk(ps, p); 1549 } 1550 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg) 1551 { 1552 struct usbdevfs_disconnectsignal32 ds; 1553 1554 if (copy_from_user(&ds, arg, sizeof(ds))) 1555 return -EFAULT; 1556 ps->discsignr = ds.signr; 1557 ps->disccontext = compat_ptr(ds.context); 1558 return 0; 1559 } 1560 1561 static int get_urb32(struct usbdevfs_urb *kurb, 1562 struct usbdevfs_urb32 __user *uurb) 1563 { 1564 __u32 uptr; 1565 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) || 1566 __get_user(kurb->type, &uurb->type) || 1567 __get_user(kurb->endpoint, &uurb->endpoint) || 1568 __get_user(kurb->status, &uurb->status) || 1569 __get_user(kurb->flags, &uurb->flags) || 1570 __get_user(kurb->buffer_length, &uurb->buffer_length) || 1571 __get_user(kurb->actual_length, &uurb->actual_length) || 1572 __get_user(kurb->start_frame, &uurb->start_frame) || 1573 __get_user(kurb->number_of_packets, &uurb->number_of_packets) || 1574 __get_user(kurb->error_count, &uurb->error_count) || 1575 __get_user(kurb->signr, &uurb->signr)) 1576 return -EFAULT; 1577 1578 if (__get_user(uptr, &uurb->buffer)) 1579 return -EFAULT; 1580 kurb->buffer = compat_ptr(uptr); 1581 if (__get_user(uptr, &uurb->usercontext)) 1582 return -EFAULT; 1583 kurb->usercontext = compat_ptr(uptr); 1584 1585 return 0; 1586 } 1587 1588 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg) 1589 { 1590 struct usbdevfs_urb uurb; 1591 1592 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg)) 1593 return -EFAULT; 1594 1595 return proc_do_submiturb(ps, &uurb, 1596 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, 1597 arg); 1598 } 1599 1600 static int processcompl_compat(struct async *as, void __user * __user *arg) 1601 { 1602 struct urb *urb = as->urb; 1603 struct usbdevfs_urb32 __user *userurb = as->userurb; 1604 void __user *addr = as->userurb; 1605 unsigned int i; 1606 1607 if (as->userbuffer && urb->actual_length) 1608 if (copy_to_user(as->userbuffer, urb->transfer_buffer, 1609 urb->actual_length)) 1610 return -EFAULT; 1611 if (put_user(as->status, &userurb->status)) 1612 return -EFAULT; 1613 if (put_user(urb->actual_length, &userurb->actual_length)) 1614 return -EFAULT; 1615 if (put_user(urb->error_count, &userurb->error_count)) 1616 return -EFAULT; 1617 1618 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1619 for (i = 0; i < urb->number_of_packets; i++) { 1620 if (put_user(urb->iso_frame_desc[i].actual_length, 1621 &userurb->iso_frame_desc[i].actual_length)) 1622 return -EFAULT; 1623 if (put_user(urb->iso_frame_desc[i].status, 1624 &userurb->iso_frame_desc[i].status)) 1625 return -EFAULT; 1626 } 1627 } 1628 1629 if (put_user(ptr_to_compat(addr), (u32 __user *)arg)) 1630 return -EFAULT; 1631 return 0; 1632 } 1633 1634 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg) 1635 { 1636 struct async *as = reap_as(ps); 1637 if (as) { 1638 int retval = processcompl_compat(as, (void __user * __user *)arg); 1639 free_async(as); 1640 return retval; 1641 } 1642 if (signal_pending(current)) 1643 return -EINTR; 1644 return -EIO; 1645 } 1646 1647 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg) 1648 { 1649 int retval; 1650 struct async *as; 1651 1652 retval = -EAGAIN; 1653 as = async_getcompleted(ps); 1654 if (as) { 1655 retval = processcompl_compat(as, (void __user * __user *)arg); 1656 free_async(as); 1657 } 1658 return retval; 1659 } 1660 1661 1662 #endif 1663 1664 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg) 1665 { 1666 struct usbdevfs_disconnectsignal ds; 1667 1668 if (copy_from_user(&ds, arg, sizeof(ds))) 1669 return -EFAULT; 1670 ps->discsignr = ds.signr; 1671 ps->disccontext = ds.context; 1672 return 0; 1673 } 1674 1675 static int proc_claiminterface(struct dev_state *ps, void __user *arg) 1676 { 1677 unsigned int ifnum; 1678 1679 if (get_user(ifnum, (unsigned int __user *)arg)) 1680 return -EFAULT; 1681 return claimintf(ps, ifnum); 1682 } 1683 1684 static int proc_releaseinterface(struct dev_state *ps, void __user *arg) 1685 { 1686 unsigned int ifnum; 1687 int ret; 1688 1689 if (get_user(ifnum, (unsigned int __user *)arg)) 1690 return -EFAULT; 1691 if ((ret = releaseintf(ps, ifnum)) < 0) 1692 return ret; 1693 destroy_async_on_interface (ps, ifnum); 1694 return 0; 1695 } 1696 1697 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl) 1698 { 1699 int size; 1700 void *buf = NULL; 1701 int retval = 0; 1702 struct usb_interface *intf = NULL; 1703 struct usb_driver *driver = NULL; 1704 1705 /* alloc buffer */ 1706 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) { 1707 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL) 1708 return -ENOMEM; 1709 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) { 1710 if (copy_from_user(buf, ctl->data, size)) { 1711 kfree(buf); 1712 return -EFAULT; 1713 } 1714 } else { 1715 memset(buf, 0, size); 1716 } 1717 } 1718 1719 if (!connected(ps)) { 1720 kfree(buf); 1721 return -ENODEV; 1722 } 1723 1724 if (ps->dev->state != USB_STATE_CONFIGURED) 1725 retval = -EHOSTUNREACH; 1726 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno))) 1727 retval = -EINVAL; 1728 else switch (ctl->ioctl_code) { 1729 1730 /* disconnect kernel driver from interface */ 1731 case USBDEVFS_DISCONNECT: 1732 if (intf->dev.driver) { 1733 driver = to_usb_driver(intf->dev.driver); 1734 dev_dbg(&intf->dev, "disconnect by usbfs\n"); 1735 usb_driver_release_interface(driver, intf); 1736 } else 1737 retval = -ENODATA; 1738 break; 1739 1740 /* let kernel drivers try to (re)bind to the interface */ 1741 case USBDEVFS_CONNECT: 1742 if (!intf->dev.driver) 1743 retval = device_attach(&intf->dev); 1744 else 1745 retval = -EBUSY; 1746 break; 1747 1748 /* talk directly to the interface's driver */ 1749 default: 1750 if (intf->dev.driver) 1751 driver = to_usb_driver(intf->dev.driver); 1752 if (driver == NULL || driver->unlocked_ioctl == NULL) { 1753 retval = -ENOTTY; 1754 } else { 1755 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf); 1756 if (retval == -ENOIOCTLCMD) 1757 retval = -ENOTTY; 1758 } 1759 } 1760 1761 /* cleanup and return */ 1762 if (retval >= 0 1763 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0 1764 && size > 0 1765 && copy_to_user(ctl->data, buf, size) != 0) 1766 retval = -EFAULT; 1767 1768 kfree(buf); 1769 return retval; 1770 } 1771 1772 static int proc_ioctl_default(struct dev_state *ps, void __user *arg) 1773 { 1774 struct usbdevfs_ioctl ctrl; 1775 1776 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 1777 return -EFAULT; 1778 return proc_ioctl(ps, &ctrl); 1779 } 1780 1781 #ifdef CONFIG_COMPAT 1782 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg) 1783 { 1784 struct usbdevfs_ioctl32 __user *uioc; 1785 struct usbdevfs_ioctl ctrl; 1786 u32 udata; 1787 1788 uioc = compat_ptr((long)arg); 1789 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) || 1790 __get_user(ctrl.ifno, &uioc->ifno) || 1791 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) || 1792 __get_user(udata, &uioc->data)) 1793 return -EFAULT; 1794 ctrl.data = compat_ptr(udata); 1795 1796 return proc_ioctl(ps, &ctrl); 1797 } 1798 #endif 1799 1800 static int proc_claim_port(struct dev_state *ps, void __user *arg) 1801 { 1802 unsigned portnum; 1803 int rc; 1804 1805 if (get_user(portnum, (unsigned __user *) arg)) 1806 return -EFAULT; 1807 rc = usb_hub_claim_port(ps->dev, portnum, ps); 1808 if (rc == 0) 1809 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n", 1810 portnum, task_pid_nr(current), current->comm); 1811 return rc; 1812 } 1813 1814 static int proc_release_port(struct dev_state *ps, void __user *arg) 1815 { 1816 unsigned portnum; 1817 1818 if (get_user(portnum, (unsigned __user *) arg)) 1819 return -EFAULT; 1820 return usb_hub_release_port(ps->dev, portnum, ps); 1821 } 1822 1823 /* 1824 * NOTE: All requests here that have interface numbers as parameters 1825 * are assuming that somehow the configuration has been prevented from 1826 * changing. But there's no mechanism to ensure that... 1827 */ 1828 static long usbdev_do_ioctl(struct file *file, unsigned int cmd, 1829 void __user *p) 1830 { 1831 struct dev_state *ps = file->private_data; 1832 struct inode *inode = file->f_path.dentry->d_inode; 1833 struct usb_device *dev = ps->dev; 1834 int ret = -ENOTTY; 1835 1836 if (!(file->f_mode & FMODE_WRITE)) 1837 return -EPERM; 1838 1839 usb_lock_device(dev); 1840 if (!connected(ps)) { 1841 usb_unlock_device(dev); 1842 return -ENODEV; 1843 } 1844 1845 switch (cmd) { 1846 case USBDEVFS_CONTROL: 1847 snoop(&dev->dev, "%s: CONTROL\n", __func__); 1848 ret = proc_control(ps, p); 1849 if (ret >= 0) 1850 inode->i_mtime = CURRENT_TIME; 1851 break; 1852 1853 case USBDEVFS_BULK: 1854 snoop(&dev->dev, "%s: BULK\n", __func__); 1855 ret = proc_bulk(ps, p); 1856 if (ret >= 0) 1857 inode->i_mtime = CURRENT_TIME; 1858 break; 1859 1860 case USBDEVFS_RESETEP: 1861 snoop(&dev->dev, "%s: RESETEP\n", __func__); 1862 ret = proc_resetep(ps, p); 1863 if (ret >= 0) 1864 inode->i_mtime = CURRENT_TIME; 1865 break; 1866 1867 case USBDEVFS_RESET: 1868 snoop(&dev->dev, "%s: RESET\n", __func__); 1869 ret = proc_resetdevice(ps); 1870 break; 1871 1872 case USBDEVFS_CLEAR_HALT: 1873 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__); 1874 ret = proc_clearhalt(ps, p); 1875 if (ret >= 0) 1876 inode->i_mtime = CURRENT_TIME; 1877 break; 1878 1879 case USBDEVFS_GETDRIVER: 1880 snoop(&dev->dev, "%s: GETDRIVER\n", __func__); 1881 ret = proc_getdriver(ps, p); 1882 break; 1883 1884 case USBDEVFS_CONNECTINFO: 1885 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__); 1886 ret = proc_connectinfo(ps, p); 1887 break; 1888 1889 case USBDEVFS_SETINTERFACE: 1890 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__); 1891 ret = proc_setintf(ps, p); 1892 break; 1893 1894 case USBDEVFS_SETCONFIGURATION: 1895 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__); 1896 ret = proc_setconfig(ps, p); 1897 break; 1898 1899 case USBDEVFS_SUBMITURB: 1900 snoop(&dev->dev, "%s: SUBMITURB\n", __func__); 1901 ret = proc_submiturb(ps, p); 1902 if (ret >= 0) 1903 inode->i_mtime = CURRENT_TIME; 1904 break; 1905 1906 #ifdef CONFIG_COMPAT 1907 case USBDEVFS_CONTROL32: 1908 snoop(&dev->dev, "%s: CONTROL32\n", __func__); 1909 ret = proc_control_compat(ps, p); 1910 if (ret >= 0) 1911 inode->i_mtime = CURRENT_TIME; 1912 break; 1913 1914 case USBDEVFS_BULK32: 1915 snoop(&dev->dev, "%s: BULK32\n", __func__); 1916 ret = proc_bulk_compat(ps, p); 1917 if (ret >= 0) 1918 inode->i_mtime = CURRENT_TIME; 1919 break; 1920 1921 case USBDEVFS_DISCSIGNAL32: 1922 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__); 1923 ret = proc_disconnectsignal_compat(ps, p); 1924 break; 1925 1926 case USBDEVFS_SUBMITURB32: 1927 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__); 1928 ret = proc_submiturb_compat(ps, p); 1929 if (ret >= 0) 1930 inode->i_mtime = CURRENT_TIME; 1931 break; 1932 1933 case USBDEVFS_REAPURB32: 1934 snoop(&dev->dev, "%s: REAPURB32\n", __func__); 1935 ret = proc_reapurb_compat(ps, p); 1936 break; 1937 1938 case USBDEVFS_REAPURBNDELAY32: 1939 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__); 1940 ret = proc_reapurbnonblock_compat(ps, p); 1941 break; 1942 1943 case USBDEVFS_IOCTL32: 1944 snoop(&dev->dev, "%s: IOCTL32\n", __func__); 1945 ret = proc_ioctl_compat(ps, ptr_to_compat(p)); 1946 break; 1947 #endif 1948 1949 case USBDEVFS_DISCARDURB: 1950 snoop(&dev->dev, "%s: DISCARDURB\n", __func__); 1951 ret = proc_unlinkurb(ps, p); 1952 break; 1953 1954 case USBDEVFS_REAPURB: 1955 snoop(&dev->dev, "%s: REAPURB\n", __func__); 1956 ret = proc_reapurb(ps, p); 1957 break; 1958 1959 case USBDEVFS_REAPURBNDELAY: 1960 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__); 1961 ret = proc_reapurbnonblock(ps, p); 1962 break; 1963 1964 case USBDEVFS_DISCSIGNAL: 1965 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__); 1966 ret = proc_disconnectsignal(ps, p); 1967 break; 1968 1969 case USBDEVFS_CLAIMINTERFACE: 1970 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__); 1971 ret = proc_claiminterface(ps, p); 1972 break; 1973 1974 case USBDEVFS_RELEASEINTERFACE: 1975 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__); 1976 ret = proc_releaseinterface(ps, p); 1977 break; 1978 1979 case USBDEVFS_IOCTL: 1980 snoop(&dev->dev, "%s: IOCTL\n", __func__); 1981 ret = proc_ioctl_default(ps, p); 1982 break; 1983 1984 case USBDEVFS_CLAIM_PORT: 1985 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__); 1986 ret = proc_claim_port(ps, p); 1987 break; 1988 1989 case USBDEVFS_RELEASE_PORT: 1990 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__); 1991 ret = proc_release_port(ps, p); 1992 break; 1993 } 1994 usb_unlock_device(dev); 1995 if (ret >= 0) 1996 inode->i_atime = CURRENT_TIME; 1997 return ret; 1998 } 1999 2000 static long usbdev_ioctl(struct file *file, unsigned int cmd, 2001 unsigned long arg) 2002 { 2003 int ret; 2004 2005 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg); 2006 2007 return ret; 2008 } 2009 2010 #ifdef CONFIG_COMPAT 2011 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd, 2012 unsigned long arg) 2013 { 2014 int ret; 2015 2016 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg)); 2017 2018 return ret; 2019 } 2020 #endif 2021 2022 /* No kernel lock - fine */ 2023 static unsigned int usbdev_poll(struct file *file, 2024 struct poll_table_struct *wait) 2025 { 2026 struct dev_state *ps = file->private_data; 2027 unsigned int mask = 0; 2028 2029 poll_wait(file, &ps->wait, wait); 2030 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed)) 2031 mask |= POLLOUT | POLLWRNORM; 2032 if (!connected(ps)) 2033 mask |= POLLERR | POLLHUP; 2034 return mask; 2035 } 2036 2037 const struct file_operations usbdev_file_operations = { 2038 .owner = THIS_MODULE, 2039 .llseek = usbdev_lseek, 2040 .read = usbdev_read, 2041 .poll = usbdev_poll, 2042 .unlocked_ioctl = usbdev_ioctl, 2043 #ifdef CONFIG_COMPAT 2044 .compat_ioctl = usbdev_compat_ioctl, 2045 #endif 2046 .open = usbdev_open, 2047 .release = usbdev_release, 2048 }; 2049 2050 static void usbdev_remove(struct usb_device *udev) 2051 { 2052 struct dev_state *ps; 2053 struct siginfo sinfo; 2054 2055 while (!list_empty(&udev->filelist)) { 2056 ps = list_entry(udev->filelist.next, struct dev_state, list); 2057 destroy_all_async(ps); 2058 wake_up_all(&ps->wait); 2059 list_del_init(&ps->list); 2060 if (ps->discsignr) { 2061 sinfo.si_signo = ps->discsignr; 2062 sinfo.si_errno = EPIPE; 2063 sinfo.si_code = SI_ASYNCIO; 2064 sinfo.si_addr = ps->disccontext; 2065 kill_pid_info_as_cred(ps->discsignr, &sinfo, 2066 ps->disc_pid, ps->cred, ps->secid); 2067 } 2068 } 2069 } 2070 2071 static int usbdev_notify(struct notifier_block *self, 2072 unsigned long action, void *dev) 2073 { 2074 switch (action) { 2075 case USB_DEVICE_ADD: 2076 break; 2077 case USB_DEVICE_REMOVE: 2078 usbdev_remove(dev); 2079 break; 2080 } 2081 return NOTIFY_OK; 2082 } 2083 2084 static struct notifier_block usbdev_nb = { 2085 .notifier_call = usbdev_notify, 2086 }; 2087 2088 static struct cdev usb_device_cdev; 2089 2090 int __init usb_devio_init(void) 2091 { 2092 int retval; 2093 2094 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX, 2095 "usb_device"); 2096 if (retval) { 2097 printk(KERN_ERR "Unable to register minors for usb_device\n"); 2098 goto out; 2099 } 2100 cdev_init(&usb_device_cdev, &usbdev_file_operations); 2101 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX); 2102 if (retval) { 2103 printk(KERN_ERR "Unable to get usb_device major %d\n", 2104 USB_DEVICE_MAJOR); 2105 goto error_cdev; 2106 } 2107 usb_register_notify(&usbdev_nb); 2108 out: 2109 return retval; 2110 2111 error_cdev: 2112 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 2113 goto out; 2114 } 2115 2116 void usb_devio_cleanup(void) 2117 { 2118 usb_unregister_notify(&usbdev_nb); 2119 cdev_del(&usb_device_cdev); 2120 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 2121 } 2122