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 unsigned long flags; 337 struct async *as; 338 339 spin_lock_irqsave(&ps->lock, flags); 340 list_for_each_entry(as, &ps->async_pending, asynclist) 341 if (as->userurb == userurb) { 342 list_del_init(&as->asynclist); 343 spin_unlock_irqrestore(&ps->lock, flags); 344 return as; 345 } 346 spin_unlock_irqrestore(&ps->lock, flags); 347 return NULL; 348 } 349 350 static void snoop_urb(struct usb_device *udev, 351 void __user *userurb, int pipe, unsigned length, 352 int timeout_or_status, enum snoop_when when, 353 unsigned char *data, unsigned data_len) 354 { 355 static const char *types[] = {"isoc", "int", "ctrl", "bulk"}; 356 static const char *dirs[] = {"out", "in"}; 357 int ep; 358 const char *t, *d; 359 360 if (!usbfs_snoop) 361 return; 362 363 ep = usb_pipeendpoint(pipe); 364 t = types[usb_pipetype(pipe)]; 365 d = dirs[!!usb_pipein(pipe)]; 366 367 if (userurb) { /* Async */ 368 if (when == SUBMIT) 369 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, " 370 "length %u\n", 371 userurb, ep, t, d, length); 372 else 373 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, " 374 "actual_length %u status %d\n", 375 userurb, ep, t, d, length, 376 timeout_or_status); 377 } else { 378 if (when == SUBMIT) 379 dev_info(&udev->dev, "ep%d %s-%s, length %u, " 380 "timeout %d\n", 381 ep, t, d, length, timeout_or_status); 382 else 383 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, " 384 "status %d\n", 385 ep, t, d, length, timeout_or_status); 386 } 387 388 if (data && data_len > 0) { 389 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1, 390 data, data_len, 1); 391 } 392 } 393 394 #define AS_CONTINUATION 1 395 #define AS_UNLINK 2 396 397 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr) 398 __releases(ps->lock) 399 __acquires(ps->lock) 400 { 401 struct async *as; 402 403 /* Mark all the pending URBs that match bulk_addr, up to but not 404 * including the first one without AS_CONTINUATION. If such an 405 * URB is encountered then a new transfer has already started so 406 * the endpoint doesn't need to be disabled; otherwise it does. 407 */ 408 list_for_each_entry(as, &ps->async_pending, asynclist) { 409 if (as->bulk_addr == bulk_addr) { 410 if (as->bulk_status != AS_CONTINUATION) 411 goto rescan; 412 as->bulk_status = AS_UNLINK; 413 as->bulk_addr = 0; 414 } 415 } 416 ps->disabled_bulk_eps |= (1 << bulk_addr); 417 418 /* Now carefully unlink all the marked pending URBs */ 419 rescan: 420 list_for_each_entry(as, &ps->async_pending, asynclist) { 421 if (as->bulk_status == AS_UNLINK) { 422 as->bulk_status = 0; /* Only once */ 423 spin_unlock(&ps->lock); /* Allow completions */ 424 usb_unlink_urb(as->urb); 425 spin_lock(&ps->lock); 426 goto rescan; 427 } 428 } 429 } 430 431 static void async_completed(struct urb *urb) 432 { 433 struct async *as = urb->context; 434 struct dev_state *ps = as->ps; 435 struct siginfo sinfo; 436 struct pid *pid = NULL; 437 u32 secid = 0; 438 const struct cred *cred = NULL; 439 int signr; 440 441 spin_lock(&ps->lock); 442 list_move_tail(&as->asynclist, &ps->async_completed); 443 as->status = urb->status; 444 signr = as->signr; 445 if (signr) { 446 sinfo.si_signo = as->signr; 447 sinfo.si_errno = as->status; 448 sinfo.si_code = SI_ASYNCIO; 449 sinfo.si_addr = as->userurb; 450 pid = get_pid(as->pid); 451 cred = get_cred(as->cred); 452 secid = as->secid; 453 } 454 snoop(&urb->dev->dev, "urb complete\n"); 455 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length, 456 as->status, COMPLETE, 457 ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_OUT) ? 458 NULL : urb->transfer_buffer, urb->actual_length); 459 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET && 460 as->status != -ENOENT) 461 cancel_bulk_urbs(ps, as->bulk_addr); 462 spin_unlock(&ps->lock); 463 464 if (signr) { 465 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid); 466 put_pid(pid); 467 put_cred(cred); 468 } 469 470 wake_up(&ps->wait); 471 } 472 473 static void destroy_async(struct dev_state *ps, struct list_head *list) 474 { 475 struct async *as; 476 unsigned long flags; 477 478 spin_lock_irqsave(&ps->lock, flags); 479 while (!list_empty(list)) { 480 as = list_entry(list->next, struct async, asynclist); 481 list_del_init(&as->asynclist); 482 483 /* drop the spinlock so the completion handler can run */ 484 spin_unlock_irqrestore(&ps->lock, flags); 485 usb_kill_urb(as->urb); 486 spin_lock_irqsave(&ps->lock, flags); 487 } 488 spin_unlock_irqrestore(&ps->lock, flags); 489 } 490 491 static void destroy_async_on_interface(struct dev_state *ps, 492 unsigned int ifnum) 493 { 494 struct list_head *p, *q, hitlist; 495 unsigned long flags; 496 497 INIT_LIST_HEAD(&hitlist); 498 spin_lock_irqsave(&ps->lock, flags); 499 list_for_each_safe(p, q, &ps->async_pending) 500 if (ifnum == list_entry(p, struct async, asynclist)->ifnum) 501 list_move_tail(p, &hitlist); 502 spin_unlock_irqrestore(&ps->lock, flags); 503 destroy_async(ps, &hitlist); 504 } 505 506 static void destroy_all_async(struct dev_state *ps) 507 { 508 destroy_async(ps, &ps->async_pending); 509 } 510 511 /* 512 * interface claims are made only at the request of user level code, 513 * which can also release them (explicitly or by closing files). 514 * they're also undone when devices disconnect. 515 */ 516 517 static int driver_probe(struct usb_interface *intf, 518 const struct usb_device_id *id) 519 { 520 return -ENODEV; 521 } 522 523 static void driver_disconnect(struct usb_interface *intf) 524 { 525 struct dev_state *ps = usb_get_intfdata(intf); 526 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber; 527 528 if (!ps) 529 return; 530 531 /* NOTE: this relies on usbcore having canceled and completed 532 * all pending I/O requests; 2.6 does that. 533 */ 534 535 if (likely(ifnum < 8*sizeof(ps->ifclaimed))) 536 clear_bit(ifnum, &ps->ifclaimed); 537 else 538 dev_warn(&intf->dev, "interface number %u out of range\n", 539 ifnum); 540 541 usb_set_intfdata(intf, NULL); 542 543 /* force async requests to complete */ 544 destroy_async_on_interface(ps, ifnum); 545 } 546 547 /* The following routines are merely placeholders. There is no way 548 * to inform a user task about suspend or resumes. 549 */ 550 static int driver_suspend(struct usb_interface *intf, pm_message_t msg) 551 { 552 return 0; 553 } 554 555 static int driver_resume(struct usb_interface *intf) 556 { 557 return 0; 558 } 559 560 struct usb_driver usbfs_driver = { 561 .name = "usbfs", 562 .probe = driver_probe, 563 .disconnect = driver_disconnect, 564 .suspend = driver_suspend, 565 .resume = driver_resume, 566 }; 567 568 static int claimintf(struct dev_state *ps, unsigned int ifnum) 569 { 570 struct usb_device *dev = ps->dev; 571 struct usb_interface *intf; 572 int err; 573 574 if (ifnum >= 8*sizeof(ps->ifclaimed)) 575 return -EINVAL; 576 /* already claimed */ 577 if (test_bit(ifnum, &ps->ifclaimed)) 578 return 0; 579 580 intf = usb_ifnum_to_if(dev, ifnum); 581 if (!intf) 582 err = -ENOENT; 583 else 584 err = usb_driver_claim_interface(&usbfs_driver, intf, ps); 585 if (err == 0) 586 set_bit(ifnum, &ps->ifclaimed); 587 return err; 588 } 589 590 static int releaseintf(struct dev_state *ps, unsigned int ifnum) 591 { 592 struct usb_device *dev; 593 struct usb_interface *intf; 594 int err; 595 596 err = -EINVAL; 597 if (ifnum >= 8*sizeof(ps->ifclaimed)) 598 return err; 599 dev = ps->dev; 600 intf = usb_ifnum_to_if(dev, ifnum); 601 if (!intf) 602 err = -ENOENT; 603 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) { 604 usb_driver_release_interface(&usbfs_driver, intf); 605 err = 0; 606 } 607 return err; 608 } 609 610 static int checkintf(struct dev_state *ps, unsigned int ifnum) 611 { 612 if (ps->dev->state != USB_STATE_CONFIGURED) 613 return -EHOSTUNREACH; 614 if (ifnum >= 8*sizeof(ps->ifclaimed)) 615 return -EINVAL; 616 if (test_bit(ifnum, &ps->ifclaimed)) 617 return 0; 618 /* if not yet claimed, claim it for the driver */ 619 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim " 620 "interface %u before use\n", task_pid_nr(current), 621 current->comm, ifnum); 622 return claimintf(ps, ifnum); 623 } 624 625 static int findintfep(struct usb_device *dev, unsigned int ep) 626 { 627 unsigned int i, j, e; 628 struct usb_interface *intf; 629 struct usb_host_interface *alts; 630 struct usb_endpoint_descriptor *endpt; 631 632 if (ep & ~(USB_DIR_IN|0xf)) 633 return -EINVAL; 634 if (!dev->actconfig) 635 return -ESRCH; 636 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { 637 intf = dev->actconfig->interface[i]; 638 for (j = 0; j < intf->num_altsetting; j++) { 639 alts = &intf->altsetting[j]; 640 for (e = 0; e < alts->desc.bNumEndpoints; e++) { 641 endpt = &alts->endpoint[e].desc; 642 if (endpt->bEndpointAddress == ep) 643 return alts->desc.bInterfaceNumber; 644 } 645 } 646 } 647 return -ENOENT; 648 } 649 650 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, 651 unsigned int request, unsigned int index) 652 { 653 int ret = 0; 654 struct usb_host_interface *alt_setting; 655 656 if (ps->dev->state != USB_STATE_UNAUTHENTICATED 657 && ps->dev->state != USB_STATE_ADDRESS 658 && ps->dev->state != USB_STATE_CONFIGURED) 659 return -EHOSTUNREACH; 660 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype)) 661 return 0; 662 663 /* 664 * check for the special corner case 'get_device_id' in the printer 665 * class specification, where wIndex is (interface << 8 | altsetting) 666 * instead of just interface 667 */ 668 if (requesttype == 0xa1 && request == 0) { 669 alt_setting = usb_find_alt_setting(ps->dev->actconfig, 670 index >> 8, index & 0xff); 671 if (alt_setting 672 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER) 673 index >>= 8; 674 } 675 676 index &= 0xff; 677 switch (requesttype & USB_RECIP_MASK) { 678 case USB_RECIP_ENDPOINT: 679 ret = findintfep(ps->dev, index); 680 if (ret >= 0) 681 ret = checkintf(ps, ret); 682 break; 683 684 case USB_RECIP_INTERFACE: 685 ret = checkintf(ps, index); 686 break; 687 } 688 return ret; 689 } 690 691 static int match_devt(struct device *dev, void *data) 692 { 693 return dev->devt == (dev_t) (unsigned long) data; 694 } 695 696 static struct usb_device *usbdev_lookup_by_devt(dev_t devt) 697 { 698 struct device *dev; 699 700 dev = bus_find_device(&usb_bus_type, NULL, 701 (void *) (unsigned long) devt, match_devt); 702 if (!dev) 703 return NULL; 704 return container_of(dev, struct usb_device, dev); 705 } 706 707 /* 708 * file operations 709 */ 710 static int usbdev_open(struct inode *inode, struct file *file) 711 { 712 struct usb_device *dev = NULL; 713 struct dev_state *ps; 714 int ret; 715 716 ret = -ENOMEM; 717 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL); 718 if (!ps) 719 goto out_free_ps; 720 721 ret = -ENODEV; 722 723 /* Protect against simultaneous removal or release */ 724 mutex_lock(&usbfs_mutex); 725 726 /* usbdev device-node */ 727 if (imajor(inode) == USB_DEVICE_MAJOR) 728 dev = usbdev_lookup_by_devt(inode->i_rdev); 729 730 #ifdef CONFIG_USB_DEVICEFS 731 /* procfs file */ 732 if (!dev) { 733 dev = inode->i_private; 734 if (dev && dev->usbfs_dentry && 735 dev->usbfs_dentry->d_inode == inode) 736 usb_get_dev(dev); 737 else 738 dev = NULL; 739 } 740 #endif 741 mutex_unlock(&usbfs_mutex); 742 743 if (!dev) 744 goto out_free_ps; 745 746 usb_lock_device(dev); 747 if (dev->state == USB_STATE_NOTATTACHED) 748 goto out_unlock_device; 749 750 ret = usb_autoresume_device(dev); 751 if (ret) 752 goto out_unlock_device; 753 754 ps->dev = dev; 755 ps->file = file; 756 spin_lock_init(&ps->lock); 757 INIT_LIST_HEAD(&ps->list); 758 INIT_LIST_HEAD(&ps->async_pending); 759 INIT_LIST_HEAD(&ps->async_completed); 760 init_waitqueue_head(&ps->wait); 761 ps->discsignr = 0; 762 ps->disc_pid = get_pid(task_pid(current)); 763 ps->cred = get_current_cred(); 764 ps->disccontext = NULL; 765 ps->ifclaimed = 0; 766 security_task_getsecid(current, &ps->secid); 767 smp_wmb(); 768 list_add_tail(&ps->list, &dev->filelist); 769 file->private_data = ps; 770 usb_unlock_device(dev); 771 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current), 772 current->comm); 773 return ret; 774 775 out_unlock_device: 776 usb_unlock_device(dev); 777 usb_put_dev(dev); 778 out_free_ps: 779 kfree(ps); 780 return ret; 781 } 782 783 static int usbdev_release(struct inode *inode, struct file *file) 784 { 785 struct dev_state *ps = file->private_data; 786 struct usb_device *dev = ps->dev; 787 unsigned int ifnum; 788 struct async *as; 789 790 usb_lock_device(dev); 791 usb_hub_release_all_ports(dev, ps); 792 793 list_del_init(&ps->list); 794 795 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed); 796 ifnum++) { 797 if (test_bit(ifnum, &ps->ifclaimed)) 798 releaseintf(ps, ifnum); 799 } 800 destroy_all_async(ps); 801 usb_autosuspend_device(dev); 802 usb_unlock_device(dev); 803 usb_put_dev(dev); 804 put_pid(ps->disc_pid); 805 put_cred(ps->cred); 806 807 as = async_getcompleted(ps); 808 while (as) { 809 free_async(as); 810 as = async_getcompleted(ps); 811 } 812 kfree(ps); 813 return 0; 814 } 815 816 static int proc_control(struct dev_state *ps, void __user *arg) 817 { 818 struct usb_device *dev = ps->dev; 819 struct usbdevfs_ctrltransfer ctrl; 820 unsigned int tmo; 821 unsigned char *tbuf; 822 unsigned wLength; 823 int i, pipe, ret; 824 825 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 826 return -EFAULT; 827 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest, 828 ctrl.wIndex); 829 if (ret) 830 return ret; 831 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */ 832 if (wLength > PAGE_SIZE) 833 return -EINVAL; 834 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) + 835 sizeof(struct usb_ctrlrequest)); 836 if (ret) 837 return ret; 838 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL); 839 if (!tbuf) { 840 ret = -ENOMEM; 841 goto done; 842 } 843 tmo = ctrl.timeout; 844 snoop(&dev->dev, "control urb: bRequestType=%02x " 845 "bRequest=%02x wValue=%04x " 846 "wIndex=%04x wLength=%04x\n", 847 ctrl.bRequestType, ctrl.bRequest, 848 __le16_to_cpup(&ctrl.wValue), 849 __le16_to_cpup(&ctrl.wIndex), 850 __le16_to_cpup(&ctrl.wLength)); 851 if (ctrl.bRequestType & 0x80) { 852 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, 853 ctrl.wLength)) { 854 ret = -EINVAL; 855 goto done; 856 } 857 pipe = usb_rcvctrlpipe(dev, 0); 858 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0); 859 860 usb_unlock_device(dev); 861 i = usb_control_msg(dev, pipe, ctrl.bRequest, 862 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 863 tbuf, ctrl.wLength, tmo); 864 usb_lock_device(dev); 865 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, 866 tbuf, max(i, 0)); 867 if ((i > 0) && ctrl.wLength) { 868 if (copy_to_user(ctrl.data, tbuf, i)) { 869 ret = -EFAULT; 870 goto done; 871 } 872 } 873 } else { 874 if (ctrl.wLength) { 875 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) { 876 ret = -EFAULT; 877 goto done; 878 } 879 } 880 pipe = usb_sndctrlpipe(dev, 0); 881 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, 882 tbuf, ctrl.wLength); 883 884 usb_unlock_device(dev); 885 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, 886 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 887 tbuf, ctrl.wLength, tmo); 888 usb_lock_device(dev); 889 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0); 890 } 891 if (i < 0 && i != -EPIPE) { 892 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL " 893 "failed cmd %s rqt %u rq %u len %u ret %d\n", 894 current->comm, ctrl.bRequestType, ctrl.bRequest, 895 ctrl.wLength, i); 896 } 897 ret = i; 898 done: 899 free_page((unsigned long) tbuf); 900 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) + 901 sizeof(struct usb_ctrlrequest)); 902 return ret; 903 } 904 905 static int proc_bulk(struct dev_state *ps, void __user *arg) 906 { 907 struct usb_device *dev = ps->dev; 908 struct usbdevfs_bulktransfer bulk; 909 unsigned int tmo, len1, pipe; 910 int len2; 911 unsigned char *tbuf; 912 int i, ret; 913 914 if (copy_from_user(&bulk, arg, sizeof(bulk))) 915 return -EFAULT; 916 ret = findintfep(ps->dev, bulk.ep); 917 if (ret < 0) 918 return ret; 919 ret = checkintf(ps, ret); 920 if (ret) 921 return ret; 922 if (bulk.ep & USB_DIR_IN) 923 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f); 924 else 925 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f); 926 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN))) 927 return -EINVAL; 928 len1 = bulk.len; 929 if (len1 >= USBFS_XFER_MAX) 930 return -EINVAL; 931 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb)); 932 if (ret) 933 return ret; 934 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) { 935 ret = -ENOMEM; 936 goto done; 937 } 938 tmo = bulk.timeout; 939 if (bulk.ep & 0x80) { 940 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) { 941 ret = -EINVAL; 942 goto done; 943 } 944 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0); 945 946 usb_unlock_device(dev); 947 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 948 usb_lock_device(dev); 949 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2); 950 951 if (!i && len2) { 952 if (copy_to_user(bulk.data, tbuf, len2)) { 953 ret = -EFAULT; 954 goto done; 955 } 956 } 957 } else { 958 if (len1) { 959 if (copy_from_user(tbuf, bulk.data, len1)) { 960 ret = -EFAULT; 961 goto done; 962 } 963 } 964 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1); 965 966 usb_unlock_device(dev); 967 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 968 usb_lock_device(dev); 969 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0); 970 } 971 ret = (i < 0 ? i : len2); 972 done: 973 kfree(tbuf); 974 usbfs_decrease_memory_usage(len1 + sizeof(struct urb)); 975 return ret; 976 } 977 978 static int proc_resetep(struct dev_state *ps, void __user *arg) 979 { 980 unsigned int ep; 981 int ret; 982 983 if (get_user(ep, (unsigned int __user *)arg)) 984 return -EFAULT; 985 ret = findintfep(ps->dev, ep); 986 if (ret < 0) 987 return ret; 988 ret = checkintf(ps, ret); 989 if (ret) 990 return ret; 991 usb_reset_endpoint(ps->dev, ep); 992 return 0; 993 } 994 995 static int proc_clearhalt(struct dev_state *ps, void __user *arg) 996 { 997 unsigned int ep; 998 int pipe; 999 int ret; 1000 1001 if (get_user(ep, (unsigned int __user *)arg)) 1002 return -EFAULT; 1003 ret = findintfep(ps->dev, ep); 1004 if (ret < 0) 1005 return ret; 1006 ret = checkintf(ps, ret); 1007 if (ret) 1008 return ret; 1009 if (ep & USB_DIR_IN) 1010 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f); 1011 else 1012 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f); 1013 1014 return usb_clear_halt(ps->dev, pipe); 1015 } 1016 1017 static int proc_getdriver(struct dev_state *ps, void __user *arg) 1018 { 1019 struct usbdevfs_getdriver gd; 1020 struct usb_interface *intf; 1021 int ret; 1022 1023 if (copy_from_user(&gd, arg, sizeof(gd))) 1024 return -EFAULT; 1025 intf = usb_ifnum_to_if(ps->dev, gd.interface); 1026 if (!intf || !intf->dev.driver) 1027 ret = -ENODATA; 1028 else { 1029 strncpy(gd.driver, intf->dev.driver->name, 1030 sizeof(gd.driver)); 1031 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0); 1032 } 1033 return ret; 1034 } 1035 1036 static int proc_connectinfo(struct dev_state *ps, void __user *arg) 1037 { 1038 struct usbdevfs_connectinfo ci = { 1039 .devnum = ps->dev->devnum, 1040 .slow = ps->dev->speed == USB_SPEED_LOW 1041 }; 1042 1043 if (copy_to_user(arg, &ci, sizeof(ci))) 1044 return -EFAULT; 1045 return 0; 1046 } 1047 1048 static int proc_resetdevice(struct dev_state *ps) 1049 { 1050 return usb_reset_device(ps->dev); 1051 } 1052 1053 static int proc_setintf(struct dev_state *ps, void __user *arg) 1054 { 1055 struct usbdevfs_setinterface setintf; 1056 int ret; 1057 1058 if (copy_from_user(&setintf, arg, sizeof(setintf))) 1059 return -EFAULT; 1060 if ((ret = checkintf(ps, setintf.interface))) 1061 return ret; 1062 return usb_set_interface(ps->dev, setintf.interface, 1063 setintf.altsetting); 1064 } 1065 1066 static int proc_setconfig(struct dev_state *ps, void __user *arg) 1067 { 1068 int u; 1069 int status = 0; 1070 struct usb_host_config *actconfig; 1071 1072 if (get_user(u, (int __user *)arg)) 1073 return -EFAULT; 1074 1075 actconfig = ps->dev->actconfig; 1076 1077 /* Don't touch the device if any interfaces are claimed. 1078 * It could interfere with other drivers' operations, and if 1079 * an interface is claimed by usbfs it could easily deadlock. 1080 */ 1081 if (actconfig) { 1082 int i; 1083 1084 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) { 1085 if (usb_interface_claimed(actconfig->interface[i])) { 1086 dev_warn(&ps->dev->dev, 1087 "usbfs: interface %d claimed by %s " 1088 "while '%s' sets config #%d\n", 1089 actconfig->interface[i] 1090 ->cur_altsetting 1091 ->desc.bInterfaceNumber, 1092 actconfig->interface[i] 1093 ->dev.driver->name, 1094 current->comm, u); 1095 status = -EBUSY; 1096 break; 1097 } 1098 } 1099 } 1100 1101 /* SET_CONFIGURATION is often abused as a "cheap" driver reset, 1102 * so avoid usb_set_configuration()'s kick to sysfs 1103 */ 1104 if (status == 0) { 1105 if (actconfig && actconfig->desc.bConfigurationValue == u) 1106 status = usb_reset_configuration(ps->dev); 1107 else 1108 status = usb_set_configuration(ps->dev, u); 1109 } 1110 1111 return status; 1112 } 1113 1114 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb, 1115 struct usbdevfs_iso_packet_desc __user *iso_frame_desc, 1116 void __user *arg) 1117 { 1118 struct usbdevfs_iso_packet_desc *isopkt = NULL; 1119 struct usb_host_endpoint *ep; 1120 struct async *as = NULL; 1121 struct usb_ctrlrequest *dr = NULL; 1122 unsigned int u, totlen, isofrmlen; 1123 int ret, ifnum = -1; 1124 int is_in; 1125 1126 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP | 1127 USBDEVFS_URB_SHORT_NOT_OK | 1128 USBDEVFS_URB_BULK_CONTINUATION | 1129 USBDEVFS_URB_NO_FSBR | 1130 USBDEVFS_URB_ZERO_PACKET | 1131 USBDEVFS_URB_NO_INTERRUPT)) 1132 return -EINVAL; 1133 if (uurb->buffer_length > 0 && !uurb->buffer) 1134 return -EINVAL; 1135 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && 1136 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) { 1137 ifnum = findintfep(ps->dev, uurb->endpoint); 1138 if (ifnum < 0) 1139 return ifnum; 1140 ret = checkintf(ps, ifnum); 1141 if (ret) 1142 return ret; 1143 } 1144 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) { 1145 is_in = 1; 1146 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 1147 } else { 1148 is_in = 0; 1149 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 1150 } 1151 if (!ep) 1152 return -ENOENT; 1153 1154 u = 0; 1155 switch(uurb->type) { 1156 case USBDEVFS_URB_TYPE_CONTROL: 1157 if (!usb_endpoint_xfer_control(&ep->desc)) 1158 return -EINVAL; 1159 /* min 8 byte setup packet */ 1160 if (uurb->buffer_length < 8) 1161 return -EINVAL; 1162 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); 1163 if (!dr) 1164 return -ENOMEM; 1165 if (copy_from_user(dr, uurb->buffer, 8)) { 1166 ret = -EFAULT; 1167 goto error; 1168 } 1169 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) { 1170 ret = -EINVAL; 1171 goto error; 1172 } 1173 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest, 1174 le16_to_cpup(&dr->wIndex)); 1175 if (ret) 1176 goto error; 1177 uurb->number_of_packets = 0; 1178 uurb->buffer_length = le16_to_cpup(&dr->wLength); 1179 uurb->buffer += 8; 1180 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) { 1181 is_in = 1; 1182 uurb->endpoint |= USB_DIR_IN; 1183 } else { 1184 is_in = 0; 1185 uurb->endpoint &= ~USB_DIR_IN; 1186 } 1187 snoop(&ps->dev->dev, "control urb: bRequestType=%02x " 1188 "bRequest=%02x wValue=%04x " 1189 "wIndex=%04x wLength=%04x\n", 1190 dr->bRequestType, dr->bRequest, 1191 __le16_to_cpup(&dr->wValue), 1192 __le16_to_cpup(&dr->wIndex), 1193 __le16_to_cpup(&dr->wLength)); 1194 u = sizeof(struct usb_ctrlrequest); 1195 break; 1196 1197 case USBDEVFS_URB_TYPE_BULK: 1198 switch (usb_endpoint_type(&ep->desc)) { 1199 case USB_ENDPOINT_XFER_CONTROL: 1200 case USB_ENDPOINT_XFER_ISOC: 1201 return -EINVAL; 1202 case USB_ENDPOINT_XFER_INT: 1203 /* allow single-shot interrupt transfers */ 1204 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT; 1205 goto interrupt_urb; 1206 } 1207 uurb->number_of_packets = 0; 1208 break; 1209 1210 case USBDEVFS_URB_TYPE_INTERRUPT: 1211 if (!usb_endpoint_xfer_int(&ep->desc)) 1212 return -EINVAL; 1213 interrupt_urb: 1214 uurb->number_of_packets = 0; 1215 break; 1216 1217 case USBDEVFS_URB_TYPE_ISO: 1218 /* arbitrary limit */ 1219 if (uurb->number_of_packets < 1 || 1220 uurb->number_of_packets > 128) 1221 return -EINVAL; 1222 if (!usb_endpoint_xfer_isoc(&ep->desc)) 1223 return -EINVAL; 1224 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * 1225 uurb->number_of_packets; 1226 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL))) 1227 return -ENOMEM; 1228 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) { 1229 ret = -EFAULT; 1230 goto error; 1231 } 1232 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1233 /* arbitrary limit, 1234 * sufficient for USB 2.0 high-bandwidth iso */ 1235 if (isopkt[u].length > 8192) { 1236 ret = -EINVAL; 1237 goto error; 1238 } 1239 totlen += isopkt[u].length; 1240 } 1241 u *= sizeof(struct usb_iso_packet_descriptor); 1242 uurb->buffer_length = totlen; 1243 break; 1244 1245 default: 1246 return -EINVAL; 1247 } 1248 1249 if (uurb->buffer_length >= USBFS_XFER_MAX) { 1250 ret = -EINVAL; 1251 goto error; 1252 } 1253 if (uurb->buffer_length > 0 && 1254 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1255 uurb->buffer, uurb->buffer_length)) { 1256 ret = -EFAULT; 1257 goto error; 1258 } 1259 as = alloc_async(uurb->number_of_packets); 1260 if (!as) { 1261 ret = -ENOMEM; 1262 goto error; 1263 } 1264 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length; 1265 ret = usbfs_increase_memory_usage(u); 1266 if (ret) 1267 goto error; 1268 as->mem_usage = u; 1269 1270 if (uurb->buffer_length > 0) { 1271 as->urb->transfer_buffer = kmalloc(uurb->buffer_length, 1272 GFP_KERNEL); 1273 if (!as->urb->transfer_buffer) { 1274 ret = -ENOMEM; 1275 goto error; 1276 } 1277 /* Isochronous input data may end up being discontiguous 1278 * if some of the packets are short. Clear the buffer so 1279 * that the gaps don't leak kernel data to userspace. 1280 */ 1281 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO) 1282 memset(as->urb->transfer_buffer, 0, 1283 uurb->buffer_length); 1284 } 1285 as->urb->dev = ps->dev; 1286 as->urb->pipe = (uurb->type << 30) | 1287 __create_pipe(ps->dev, uurb->endpoint & 0xf) | 1288 (uurb->endpoint & USB_DIR_IN); 1289 1290 /* This tedious sequence is necessary because the URB_* flags 1291 * are internal to the kernel and subject to change, whereas 1292 * the USBDEVFS_URB_* flags are a user API and must not be changed. 1293 */ 1294 u = (is_in ? URB_DIR_IN : URB_DIR_OUT); 1295 if (uurb->flags & USBDEVFS_URB_ISO_ASAP) 1296 u |= URB_ISO_ASAP; 1297 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK) 1298 u |= URB_SHORT_NOT_OK; 1299 if (uurb->flags & USBDEVFS_URB_NO_FSBR) 1300 u |= URB_NO_FSBR; 1301 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET) 1302 u |= URB_ZERO_PACKET; 1303 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT) 1304 u |= URB_NO_INTERRUPT; 1305 as->urb->transfer_flags = u; 1306 1307 as->urb->transfer_buffer_length = uurb->buffer_length; 1308 as->urb->setup_packet = (unsigned char *)dr; 1309 dr = NULL; 1310 as->urb->start_frame = uurb->start_frame; 1311 as->urb->number_of_packets = uurb->number_of_packets; 1312 if (uurb->type == USBDEVFS_URB_TYPE_ISO || 1313 ps->dev->speed == USB_SPEED_HIGH) 1314 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1); 1315 else 1316 as->urb->interval = ep->desc.bInterval; 1317 as->urb->context = as; 1318 as->urb->complete = async_completed; 1319 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1320 as->urb->iso_frame_desc[u].offset = totlen; 1321 as->urb->iso_frame_desc[u].length = isopkt[u].length; 1322 totlen += isopkt[u].length; 1323 } 1324 kfree(isopkt); 1325 isopkt = NULL; 1326 as->ps = ps; 1327 as->userurb = arg; 1328 if (is_in && uurb->buffer_length > 0) 1329 as->userbuffer = uurb->buffer; 1330 else 1331 as->userbuffer = NULL; 1332 as->signr = uurb->signr; 1333 as->ifnum = ifnum; 1334 as->pid = get_pid(task_pid(current)); 1335 as->cred = get_current_cred(); 1336 security_task_getsecid(current, &as->secid); 1337 if (!is_in && uurb->buffer_length > 0) { 1338 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, 1339 uurb->buffer_length)) { 1340 ret = -EFAULT; 1341 goto error; 1342 } 1343 } 1344 snoop_urb(ps->dev, as->userurb, as->urb->pipe, 1345 as->urb->transfer_buffer_length, 0, SUBMIT, 1346 is_in ? NULL : as->urb->transfer_buffer, 1347 uurb->buffer_length); 1348 async_newpending(as); 1349 1350 if (usb_endpoint_xfer_bulk(&ep->desc)) { 1351 spin_lock_irq(&ps->lock); 1352 1353 /* Not exactly the endpoint address; the direction bit is 1354 * shifted to the 0x10 position so that the value will be 1355 * between 0 and 31. 1356 */ 1357 as->bulk_addr = usb_endpoint_num(&ep->desc) | 1358 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK) 1359 >> 3); 1360 1361 /* If this bulk URB is the start of a new transfer, re-enable 1362 * the endpoint. Otherwise mark it as a continuation URB. 1363 */ 1364 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION) 1365 as->bulk_status = AS_CONTINUATION; 1366 else 1367 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr); 1368 1369 /* Don't accept continuation URBs if the endpoint is 1370 * disabled because of an earlier error. 1371 */ 1372 if (ps->disabled_bulk_eps & (1 << as->bulk_addr)) 1373 ret = -EREMOTEIO; 1374 else 1375 ret = usb_submit_urb(as->urb, GFP_ATOMIC); 1376 spin_unlock_irq(&ps->lock); 1377 } else { 1378 ret = usb_submit_urb(as->urb, GFP_KERNEL); 1379 } 1380 1381 if (ret) { 1382 dev_printk(KERN_DEBUG, &ps->dev->dev, 1383 "usbfs: usb_submit_urb returned %d\n", ret); 1384 snoop_urb(ps->dev, as->userurb, as->urb->pipe, 1385 0, ret, COMPLETE, NULL, 0); 1386 async_removepending(as); 1387 goto error; 1388 } 1389 return 0; 1390 1391 error: 1392 kfree(isopkt); 1393 kfree(dr); 1394 if (as) 1395 free_async(as); 1396 return ret; 1397 } 1398 1399 static int proc_submiturb(struct dev_state *ps, void __user *arg) 1400 { 1401 struct usbdevfs_urb uurb; 1402 1403 if (copy_from_user(&uurb, arg, sizeof(uurb))) 1404 return -EFAULT; 1405 1406 return proc_do_submiturb(ps, &uurb, 1407 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), 1408 arg); 1409 } 1410 1411 static int proc_unlinkurb(struct dev_state *ps, void __user *arg) 1412 { 1413 struct async *as; 1414 1415 as = async_getpending(ps, arg); 1416 if (!as) 1417 return -EINVAL; 1418 usb_kill_urb(as->urb); 1419 return 0; 1420 } 1421 1422 static int processcompl(struct async *as, void __user * __user *arg) 1423 { 1424 struct urb *urb = as->urb; 1425 struct usbdevfs_urb __user *userurb = as->userurb; 1426 void __user *addr = as->userurb; 1427 unsigned int i; 1428 1429 if (as->userbuffer && urb->actual_length) { 1430 if (urb->number_of_packets > 0) /* Isochronous */ 1431 i = urb->transfer_buffer_length; 1432 else /* Non-Isoc */ 1433 i = urb->actual_length; 1434 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i)) 1435 goto err_out; 1436 } 1437 if (put_user(as->status, &userurb->status)) 1438 goto err_out; 1439 if (put_user(urb->actual_length, &userurb->actual_length)) 1440 goto err_out; 1441 if (put_user(urb->error_count, &userurb->error_count)) 1442 goto err_out; 1443 1444 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1445 for (i = 0; i < urb->number_of_packets; i++) { 1446 if (put_user(urb->iso_frame_desc[i].actual_length, 1447 &userurb->iso_frame_desc[i].actual_length)) 1448 goto err_out; 1449 if (put_user(urb->iso_frame_desc[i].status, 1450 &userurb->iso_frame_desc[i].status)) 1451 goto err_out; 1452 } 1453 } 1454 1455 if (put_user(addr, (void __user * __user *)arg)) 1456 return -EFAULT; 1457 return 0; 1458 1459 err_out: 1460 return -EFAULT; 1461 } 1462 1463 static struct async *reap_as(struct dev_state *ps) 1464 { 1465 DECLARE_WAITQUEUE(wait, current); 1466 struct async *as = NULL; 1467 struct usb_device *dev = ps->dev; 1468 1469 add_wait_queue(&ps->wait, &wait); 1470 for (;;) { 1471 __set_current_state(TASK_INTERRUPTIBLE); 1472 as = async_getcompleted(ps); 1473 if (as) 1474 break; 1475 if (signal_pending(current)) 1476 break; 1477 usb_unlock_device(dev); 1478 schedule(); 1479 usb_lock_device(dev); 1480 } 1481 remove_wait_queue(&ps->wait, &wait); 1482 set_current_state(TASK_RUNNING); 1483 return as; 1484 } 1485 1486 static int proc_reapurb(struct dev_state *ps, void __user *arg) 1487 { 1488 struct async *as = reap_as(ps); 1489 if (as) { 1490 int retval = processcompl(as, (void __user * __user *)arg); 1491 free_async(as); 1492 return retval; 1493 } 1494 if (signal_pending(current)) 1495 return -EINTR; 1496 return -EIO; 1497 } 1498 1499 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg) 1500 { 1501 int retval; 1502 struct async *as; 1503 1504 as = async_getcompleted(ps); 1505 retval = -EAGAIN; 1506 if (as) { 1507 retval = processcompl(as, (void __user * __user *)arg); 1508 free_async(as); 1509 } 1510 return retval; 1511 } 1512 1513 #ifdef CONFIG_COMPAT 1514 static int proc_control_compat(struct dev_state *ps, 1515 struct usbdevfs_ctrltransfer32 __user *p32) 1516 { 1517 struct usbdevfs_ctrltransfer __user *p; 1518 __u32 udata; 1519 p = compat_alloc_user_space(sizeof(*p)); 1520 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) || 1521 get_user(udata, &p32->data) || 1522 put_user(compat_ptr(udata), &p->data)) 1523 return -EFAULT; 1524 return proc_control(ps, p); 1525 } 1526 1527 static int proc_bulk_compat(struct dev_state *ps, 1528 struct usbdevfs_bulktransfer32 __user *p32) 1529 { 1530 struct usbdevfs_bulktransfer __user *p; 1531 compat_uint_t n; 1532 compat_caddr_t addr; 1533 1534 p = compat_alloc_user_space(sizeof(*p)); 1535 1536 if (get_user(n, &p32->ep) || put_user(n, &p->ep) || 1537 get_user(n, &p32->len) || put_user(n, &p->len) || 1538 get_user(n, &p32->timeout) || put_user(n, &p->timeout) || 1539 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data)) 1540 return -EFAULT; 1541 1542 return proc_bulk(ps, p); 1543 } 1544 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg) 1545 { 1546 struct usbdevfs_disconnectsignal32 ds; 1547 1548 if (copy_from_user(&ds, arg, sizeof(ds))) 1549 return -EFAULT; 1550 ps->discsignr = ds.signr; 1551 ps->disccontext = compat_ptr(ds.context); 1552 return 0; 1553 } 1554 1555 static int get_urb32(struct usbdevfs_urb *kurb, 1556 struct usbdevfs_urb32 __user *uurb) 1557 { 1558 __u32 uptr; 1559 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) || 1560 __get_user(kurb->type, &uurb->type) || 1561 __get_user(kurb->endpoint, &uurb->endpoint) || 1562 __get_user(kurb->status, &uurb->status) || 1563 __get_user(kurb->flags, &uurb->flags) || 1564 __get_user(kurb->buffer_length, &uurb->buffer_length) || 1565 __get_user(kurb->actual_length, &uurb->actual_length) || 1566 __get_user(kurb->start_frame, &uurb->start_frame) || 1567 __get_user(kurb->number_of_packets, &uurb->number_of_packets) || 1568 __get_user(kurb->error_count, &uurb->error_count) || 1569 __get_user(kurb->signr, &uurb->signr)) 1570 return -EFAULT; 1571 1572 if (__get_user(uptr, &uurb->buffer)) 1573 return -EFAULT; 1574 kurb->buffer = compat_ptr(uptr); 1575 if (__get_user(uptr, &uurb->usercontext)) 1576 return -EFAULT; 1577 kurb->usercontext = compat_ptr(uptr); 1578 1579 return 0; 1580 } 1581 1582 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg) 1583 { 1584 struct usbdevfs_urb uurb; 1585 1586 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg)) 1587 return -EFAULT; 1588 1589 return proc_do_submiturb(ps, &uurb, 1590 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, 1591 arg); 1592 } 1593 1594 static int processcompl_compat(struct async *as, void __user * __user *arg) 1595 { 1596 struct urb *urb = as->urb; 1597 struct usbdevfs_urb32 __user *userurb = as->userurb; 1598 void __user *addr = as->userurb; 1599 unsigned int i; 1600 1601 if (as->userbuffer && urb->actual_length) 1602 if (copy_to_user(as->userbuffer, urb->transfer_buffer, 1603 urb->actual_length)) 1604 return -EFAULT; 1605 if (put_user(as->status, &userurb->status)) 1606 return -EFAULT; 1607 if (put_user(urb->actual_length, &userurb->actual_length)) 1608 return -EFAULT; 1609 if (put_user(urb->error_count, &userurb->error_count)) 1610 return -EFAULT; 1611 1612 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1613 for (i = 0; i < urb->number_of_packets; i++) { 1614 if (put_user(urb->iso_frame_desc[i].actual_length, 1615 &userurb->iso_frame_desc[i].actual_length)) 1616 return -EFAULT; 1617 if (put_user(urb->iso_frame_desc[i].status, 1618 &userurb->iso_frame_desc[i].status)) 1619 return -EFAULT; 1620 } 1621 } 1622 1623 if (put_user(ptr_to_compat(addr), (u32 __user *)arg)) 1624 return -EFAULT; 1625 return 0; 1626 } 1627 1628 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg) 1629 { 1630 struct async *as = reap_as(ps); 1631 if (as) { 1632 int retval = processcompl_compat(as, (void __user * __user *)arg); 1633 free_async(as); 1634 return retval; 1635 } 1636 if (signal_pending(current)) 1637 return -EINTR; 1638 return -EIO; 1639 } 1640 1641 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg) 1642 { 1643 int retval; 1644 struct async *as; 1645 1646 retval = -EAGAIN; 1647 as = async_getcompleted(ps); 1648 if (as) { 1649 retval = processcompl_compat(as, (void __user * __user *)arg); 1650 free_async(as); 1651 } 1652 return retval; 1653 } 1654 1655 1656 #endif 1657 1658 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg) 1659 { 1660 struct usbdevfs_disconnectsignal ds; 1661 1662 if (copy_from_user(&ds, arg, sizeof(ds))) 1663 return -EFAULT; 1664 ps->discsignr = ds.signr; 1665 ps->disccontext = ds.context; 1666 return 0; 1667 } 1668 1669 static int proc_claiminterface(struct dev_state *ps, void __user *arg) 1670 { 1671 unsigned int ifnum; 1672 1673 if (get_user(ifnum, (unsigned int __user *)arg)) 1674 return -EFAULT; 1675 return claimintf(ps, ifnum); 1676 } 1677 1678 static int proc_releaseinterface(struct dev_state *ps, void __user *arg) 1679 { 1680 unsigned int ifnum; 1681 int ret; 1682 1683 if (get_user(ifnum, (unsigned int __user *)arg)) 1684 return -EFAULT; 1685 if ((ret = releaseintf(ps, ifnum)) < 0) 1686 return ret; 1687 destroy_async_on_interface (ps, ifnum); 1688 return 0; 1689 } 1690 1691 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl) 1692 { 1693 int size; 1694 void *buf = NULL; 1695 int retval = 0; 1696 struct usb_interface *intf = NULL; 1697 struct usb_driver *driver = NULL; 1698 1699 /* alloc buffer */ 1700 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) { 1701 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL) 1702 return -ENOMEM; 1703 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) { 1704 if (copy_from_user(buf, ctl->data, size)) { 1705 kfree(buf); 1706 return -EFAULT; 1707 } 1708 } else { 1709 memset(buf, 0, size); 1710 } 1711 } 1712 1713 if (!connected(ps)) { 1714 kfree(buf); 1715 return -ENODEV; 1716 } 1717 1718 if (ps->dev->state != USB_STATE_CONFIGURED) 1719 retval = -EHOSTUNREACH; 1720 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno))) 1721 retval = -EINVAL; 1722 else switch (ctl->ioctl_code) { 1723 1724 /* disconnect kernel driver from interface */ 1725 case USBDEVFS_DISCONNECT: 1726 if (intf->dev.driver) { 1727 driver = to_usb_driver(intf->dev.driver); 1728 dev_dbg(&intf->dev, "disconnect by usbfs\n"); 1729 usb_driver_release_interface(driver, intf); 1730 } else 1731 retval = -ENODATA; 1732 break; 1733 1734 /* let kernel drivers try to (re)bind to the interface */ 1735 case USBDEVFS_CONNECT: 1736 if (!intf->dev.driver) 1737 retval = device_attach(&intf->dev); 1738 else 1739 retval = -EBUSY; 1740 break; 1741 1742 /* talk directly to the interface's driver */ 1743 default: 1744 if (intf->dev.driver) 1745 driver = to_usb_driver(intf->dev.driver); 1746 if (driver == NULL || driver->unlocked_ioctl == NULL) { 1747 retval = -ENOTTY; 1748 } else { 1749 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf); 1750 if (retval == -ENOIOCTLCMD) 1751 retval = -ENOTTY; 1752 } 1753 } 1754 1755 /* cleanup and return */ 1756 if (retval >= 0 1757 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0 1758 && size > 0 1759 && copy_to_user(ctl->data, buf, size) != 0) 1760 retval = -EFAULT; 1761 1762 kfree(buf); 1763 return retval; 1764 } 1765 1766 static int proc_ioctl_default(struct dev_state *ps, void __user *arg) 1767 { 1768 struct usbdevfs_ioctl ctrl; 1769 1770 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 1771 return -EFAULT; 1772 return proc_ioctl(ps, &ctrl); 1773 } 1774 1775 #ifdef CONFIG_COMPAT 1776 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg) 1777 { 1778 struct usbdevfs_ioctl32 __user *uioc; 1779 struct usbdevfs_ioctl ctrl; 1780 u32 udata; 1781 1782 uioc = compat_ptr((long)arg); 1783 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) || 1784 __get_user(ctrl.ifno, &uioc->ifno) || 1785 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) || 1786 __get_user(udata, &uioc->data)) 1787 return -EFAULT; 1788 ctrl.data = compat_ptr(udata); 1789 1790 return proc_ioctl(ps, &ctrl); 1791 } 1792 #endif 1793 1794 static int proc_claim_port(struct dev_state *ps, void __user *arg) 1795 { 1796 unsigned portnum; 1797 int rc; 1798 1799 if (get_user(portnum, (unsigned __user *) arg)) 1800 return -EFAULT; 1801 rc = usb_hub_claim_port(ps->dev, portnum, ps); 1802 if (rc == 0) 1803 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n", 1804 portnum, task_pid_nr(current), current->comm); 1805 return rc; 1806 } 1807 1808 static int proc_release_port(struct dev_state *ps, void __user *arg) 1809 { 1810 unsigned portnum; 1811 1812 if (get_user(portnum, (unsigned __user *) arg)) 1813 return -EFAULT; 1814 return usb_hub_release_port(ps->dev, portnum, ps); 1815 } 1816 1817 /* 1818 * NOTE: All requests here that have interface numbers as parameters 1819 * are assuming that somehow the configuration has been prevented from 1820 * changing. But there's no mechanism to ensure that... 1821 */ 1822 static long usbdev_do_ioctl(struct file *file, unsigned int cmd, 1823 void __user *p) 1824 { 1825 struct dev_state *ps = file->private_data; 1826 struct inode *inode = file->f_path.dentry->d_inode; 1827 struct usb_device *dev = ps->dev; 1828 int ret = -ENOTTY; 1829 1830 if (!(file->f_mode & FMODE_WRITE)) 1831 return -EPERM; 1832 1833 usb_lock_device(dev); 1834 if (!connected(ps)) { 1835 usb_unlock_device(dev); 1836 return -ENODEV; 1837 } 1838 1839 switch (cmd) { 1840 case USBDEVFS_CONTROL: 1841 snoop(&dev->dev, "%s: CONTROL\n", __func__); 1842 ret = proc_control(ps, p); 1843 if (ret >= 0) 1844 inode->i_mtime = CURRENT_TIME; 1845 break; 1846 1847 case USBDEVFS_BULK: 1848 snoop(&dev->dev, "%s: BULK\n", __func__); 1849 ret = proc_bulk(ps, p); 1850 if (ret >= 0) 1851 inode->i_mtime = CURRENT_TIME; 1852 break; 1853 1854 case USBDEVFS_RESETEP: 1855 snoop(&dev->dev, "%s: RESETEP\n", __func__); 1856 ret = proc_resetep(ps, p); 1857 if (ret >= 0) 1858 inode->i_mtime = CURRENT_TIME; 1859 break; 1860 1861 case USBDEVFS_RESET: 1862 snoop(&dev->dev, "%s: RESET\n", __func__); 1863 ret = proc_resetdevice(ps); 1864 break; 1865 1866 case USBDEVFS_CLEAR_HALT: 1867 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__); 1868 ret = proc_clearhalt(ps, p); 1869 if (ret >= 0) 1870 inode->i_mtime = CURRENT_TIME; 1871 break; 1872 1873 case USBDEVFS_GETDRIVER: 1874 snoop(&dev->dev, "%s: GETDRIVER\n", __func__); 1875 ret = proc_getdriver(ps, p); 1876 break; 1877 1878 case USBDEVFS_CONNECTINFO: 1879 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__); 1880 ret = proc_connectinfo(ps, p); 1881 break; 1882 1883 case USBDEVFS_SETINTERFACE: 1884 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__); 1885 ret = proc_setintf(ps, p); 1886 break; 1887 1888 case USBDEVFS_SETCONFIGURATION: 1889 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__); 1890 ret = proc_setconfig(ps, p); 1891 break; 1892 1893 case USBDEVFS_SUBMITURB: 1894 snoop(&dev->dev, "%s: SUBMITURB\n", __func__); 1895 ret = proc_submiturb(ps, p); 1896 if (ret >= 0) 1897 inode->i_mtime = CURRENT_TIME; 1898 break; 1899 1900 #ifdef CONFIG_COMPAT 1901 case USBDEVFS_CONTROL32: 1902 snoop(&dev->dev, "%s: CONTROL32\n", __func__); 1903 ret = proc_control_compat(ps, p); 1904 if (ret >= 0) 1905 inode->i_mtime = CURRENT_TIME; 1906 break; 1907 1908 case USBDEVFS_BULK32: 1909 snoop(&dev->dev, "%s: BULK32\n", __func__); 1910 ret = proc_bulk_compat(ps, p); 1911 if (ret >= 0) 1912 inode->i_mtime = CURRENT_TIME; 1913 break; 1914 1915 case USBDEVFS_DISCSIGNAL32: 1916 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__); 1917 ret = proc_disconnectsignal_compat(ps, p); 1918 break; 1919 1920 case USBDEVFS_SUBMITURB32: 1921 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__); 1922 ret = proc_submiturb_compat(ps, p); 1923 if (ret >= 0) 1924 inode->i_mtime = CURRENT_TIME; 1925 break; 1926 1927 case USBDEVFS_REAPURB32: 1928 snoop(&dev->dev, "%s: REAPURB32\n", __func__); 1929 ret = proc_reapurb_compat(ps, p); 1930 break; 1931 1932 case USBDEVFS_REAPURBNDELAY32: 1933 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__); 1934 ret = proc_reapurbnonblock_compat(ps, p); 1935 break; 1936 1937 case USBDEVFS_IOCTL32: 1938 snoop(&dev->dev, "%s: IOCTL32\n", __func__); 1939 ret = proc_ioctl_compat(ps, ptr_to_compat(p)); 1940 break; 1941 #endif 1942 1943 case USBDEVFS_DISCARDURB: 1944 snoop(&dev->dev, "%s: DISCARDURB\n", __func__); 1945 ret = proc_unlinkurb(ps, p); 1946 break; 1947 1948 case USBDEVFS_REAPURB: 1949 snoop(&dev->dev, "%s: REAPURB\n", __func__); 1950 ret = proc_reapurb(ps, p); 1951 break; 1952 1953 case USBDEVFS_REAPURBNDELAY: 1954 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__); 1955 ret = proc_reapurbnonblock(ps, p); 1956 break; 1957 1958 case USBDEVFS_DISCSIGNAL: 1959 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__); 1960 ret = proc_disconnectsignal(ps, p); 1961 break; 1962 1963 case USBDEVFS_CLAIMINTERFACE: 1964 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__); 1965 ret = proc_claiminterface(ps, p); 1966 break; 1967 1968 case USBDEVFS_RELEASEINTERFACE: 1969 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__); 1970 ret = proc_releaseinterface(ps, p); 1971 break; 1972 1973 case USBDEVFS_IOCTL: 1974 snoop(&dev->dev, "%s: IOCTL\n", __func__); 1975 ret = proc_ioctl_default(ps, p); 1976 break; 1977 1978 case USBDEVFS_CLAIM_PORT: 1979 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__); 1980 ret = proc_claim_port(ps, p); 1981 break; 1982 1983 case USBDEVFS_RELEASE_PORT: 1984 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__); 1985 ret = proc_release_port(ps, p); 1986 break; 1987 } 1988 usb_unlock_device(dev); 1989 if (ret >= 0) 1990 inode->i_atime = CURRENT_TIME; 1991 return ret; 1992 } 1993 1994 static long usbdev_ioctl(struct file *file, unsigned int cmd, 1995 unsigned long arg) 1996 { 1997 int ret; 1998 1999 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg); 2000 2001 return ret; 2002 } 2003 2004 #ifdef CONFIG_COMPAT 2005 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd, 2006 unsigned long arg) 2007 { 2008 int ret; 2009 2010 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg)); 2011 2012 return ret; 2013 } 2014 #endif 2015 2016 /* No kernel lock - fine */ 2017 static unsigned int usbdev_poll(struct file *file, 2018 struct poll_table_struct *wait) 2019 { 2020 struct dev_state *ps = file->private_data; 2021 unsigned int mask = 0; 2022 2023 poll_wait(file, &ps->wait, wait); 2024 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed)) 2025 mask |= POLLOUT | POLLWRNORM; 2026 if (!connected(ps)) 2027 mask |= POLLERR | POLLHUP; 2028 return mask; 2029 } 2030 2031 const struct file_operations usbdev_file_operations = { 2032 .owner = THIS_MODULE, 2033 .llseek = usbdev_lseek, 2034 .read = usbdev_read, 2035 .poll = usbdev_poll, 2036 .unlocked_ioctl = usbdev_ioctl, 2037 #ifdef CONFIG_COMPAT 2038 .compat_ioctl = usbdev_compat_ioctl, 2039 #endif 2040 .open = usbdev_open, 2041 .release = usbdev_release, 2042 }; 2043 2044 static void usbdev_remove(struct usb_device *udev) 2045 { 2046 struct dev_state *ps; 2047 struct siginfo sinfo; 2048 2049 while (!list_empty(&udev->filelist)) { 2050 ps = list_entry(udev->filelist.next, struct dev_state, list); 2051 destroy_all_async(ps); 2052 wake_up_all(&ps->wait); 2053 list_del_init(&ps->list); 2054 if (ps->discsignr) { 2055 sinfo.si_signo = ps->discsignr; 2056 sinfo.si_errno = EPIPE; 2057 sinfo.si_code = SI_ASYNCIO; 2058 sinfo.si_addr = ps->disccontext; 2059 kill_pid_info_as_cred(ps->discsignr, &sinfo, 2060 ps->disc_pid, ps->cred, ps->secid); 2061 } 2062 } 2063 } 2064 2065 #ifdef CONFIG_USB_DEVICE_CLASS 2066 static struct class *usb_classdev_class; 2067 2068 static int usb_classdev_add(struct usb_device *dev) 2069 { 2070 struct device *cldev; 2071 2072 cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt, 2073 NULL, "usbdev%d.%d", dev->bus->busnum, 2074 dev->devnum); 2075 if (IS_ERR(cldev)) 2076 return PTR_ERR(cldev); 2077 dev->usb_classdev = cldev; 2078 return 0; 2079 } 2080 2081 static void usb_classdev_remove(struct usb_device *dev) 2082 { 2083 if (dev->usb_classdev) 2084 device_unregister(dev->usb_classdev); 2085 } 2086 2087 #else 2088 #define usb_classdev_add(dev) 0 2089 #define usb_classdev_remove(dev) do {} while (0) 2090 2091 #endif 2092 2093 static int usbdev_notify(struct notifier_block *self, 2094 unsigned long action, void *dev) 2095 { 2096 switch (action) { 2097 case USB_DEVICE_ADD: 2098 if (usb_classdev_add(dev)) 2099 return NOTIFY_BAD; 2100 break; 2101 case USB_DEVICE_REMOVE: 2102 usb_classdev_remove(dev); 2103 usbdev_remove(dev); 2104 break; 2105 } 2106 return NOTIFY_OK; 2107 } 2108 2109 static struct notifier_block usbdev_nb = { 2110 .notifier_call = usbdev_notify, 2111 }; 2112 2113 static struct cdev usb_device_cdev; 2114 2115 int __init usb_devio_init(void) 2116 { 2117 int retval; 2118 2119 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX, 2120 "usb_device"); 2121 if (retval) { 2122 printk(KERN_ERR "Unable to register minors for usb_device\n"); 2123 goto out; 2124 } 2125 cdev_init(&usb_device_cdev, &usbdev_file_operations); 2126 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX); 2127 if (retval) { 2128 printk(KERN_ERR "Unable to get usb_device major %d\n", 2129 USB_DEVICE_MAJOR); 2130 goto error_cdev; 2131 } 2132 #ifdef CONFIG_USB_DEVICE_CLASS 2133 usb_classdev_class = class_create(THIS_MODULE, "usb_device"); 2134 if (IS_ERR(usb_classdev_class)) { 2135 printk(KERN_ERR "Unable to register usb_device class\n"); 2136 retval = PTR_ERR(usb_classdev_class); 2137 cdev_del(&usb_device_cdev); 2138 usb_classdev_class = NULL; 2139 goto out; 2140 } 2141 /* devices of this class shadow the major:minor of their parent 2142 * device, so clear ->dev_kobj to prevent adding duplicate entries 2143 * to /sys/dev 2144 */ 2145 usb_classdev_class->dev_kobj = NULL; 2146 #endif 2147 usb_register_notify(&usbdev_nb); 2148 out: 2149 return retval; 2150 2151 error_cdev: 2152 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 2153 goto out; 2154 } 2155 2156 void usb_devio_cleanup(void) 2157 { 2158 usb_unregister_notify(&usbdev_nb); 2159 #ifdef CONFIG_USB_DEVICE_CLASS 2160 class_destroy(usb_classdev_class); 2161 #endif 2162 cdev_del(&usb_device_cdev); 2163 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 2164 } 2165