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 */ 60DEFINE_MUTEX(usbfs_mutex); 61 62struct 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 79struct 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 96static bool usbfs_snoop; 97module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR); 98MODULE_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 106enum 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 */ 113static unsigned usbfs_memory_mb = 16; 114module_param(usbfs_memory_mb, uint, 0644); 115MODULE_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 121static atomic_t usbfs_memory_usage; /* Total memory currently allocated */ 122 123/* Check whether it's okay to allocate more memory for a transfer */ 124static 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 */ 146static void usbfs_decrease_memory_usage(unsigned amount) 147{ 148 atomic_sub(amount, &usbfs_memory_usage); 149} 150 151static int connected(struct dev_state *ps) 152{ 153 return (!list_empty(&ps->list) && 154 ps->dev->state != USB_STATE_NOTATTACHED); 155} 156 157static 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 181static 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 262err: 263 usb_unlock_device(dev); 264 return ret; 265} 266 267/* 268 * async list handling 269 */ 270 271static 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 286static 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 298static 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 308static 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 318static 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 333static 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 347static 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 394static 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 432static 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 474static 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 496static 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 511static 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 522static int driver_probe(struct usb_interface *intf, 523 const struct usb_device_id *id) 524{ 525 return -ENODEV; 526} 527 528static 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 */ 555static int driver_suspend(struct usb_interface *intf, pm_message_t msg) 556{ 557 return 0; 558} 559 560static int driver_resume(struct usb_interface *intf) 561{ 562 return 0; 563} 564 565struct 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 573static 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 595static 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 615static 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 630static 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 655static 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 696static int match_devt(struct device *dev, void *data) 697{ 698 return dev->devt == (dev_t) (unsigned long) data; 699} 700 701static 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 */ 715static 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#ifdef CONFIG_USB_DEVICEFS 736 /* procfs file */ 737 if (!dev) { 738 dev = inode->i_private; 739 if (dev && dev->usbfs_dentry && 740 dev->usbfs_dentry->d_inode == inode) 741 usb_get_dev(dev); 742 else 743 dev = NULL; 744 } 745#endif 746 mutex_unlock(&usbfs_mutex); 747 748 if (!dev) 749 goto out_free_ps; 750 751 usb_lock_device(dev); 752 if (dev->state == USB_STATE_NOTATTACHED) 753 goto out_unlock_device; 754 755 ret = usb_autoresume_device(dev); 756 if (ret) 757 goto out_unlock_device; 758 759 ps->dev = dev; 760 ps->file = file; 761 spin_lock_init(&ps->lock); 762 INIT_LIST_HEAD(&ps->list); 763 INIT_LIST_HEAD(&ps->async_pending); 764 INIT_LIST_HEAD(&ps->async_completed); 765 init_waitqueue_head(&ps->wait); 766 ps->discsignr = 0; 767 ps->disc_pid = get_pid(task_pid(current)); 768 ps->cred = get_current_cred(); 769 ps->disccontext = NULL; 770 ps->ifclaimed = 0; 771 security_task_getsecid(current, &ps->secid); 772 smp_wmb(); 773 list_add_tail(&ps->list, &dev->filelist); 774 file->private_data = ps; 775 usb_unlock_device(dev); 776 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current), 777 current->comm); 778 return ret; 779 780 out_unlock_device: 781 usb_unlock_device(dev); 782 usb_put_dev(dev); 783 out_free_ps: 784 kfree(ps); 785 return ret; 786} 787 788static int usbdev_release(struct inode *inode, struct file *file) 789{ 790 struct dev_state *ps = file->private_data; 791 struct usb_device *dev = ps->dev; 792 unsigned int ifnum; 793 struct async *as; 794 795 usb_lock_device(dev); 796 usb_hub_release_all_ports(dev, ps); 797 798 list_del_init(&ps->list); 799 800 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed); 801 ifnum++) { 802 if (test_bit(ifnum, &ps->ifclaimed)) 803 releaseintf(ps, ifnum); 804 } 805 destroy_all_async(ps); 806 usb_autosuspend_device(dev); 807 usb_unlock_device(dev); 808 usb_put_dev(dev); 809 put_pid(ps->disc_pid); 810 put_cred(ps->cred); 811 812 as = async_getcompleted(ps); 813 while (as) { 814 free_async(as); 815 as = async_getcompleted(ps); 816 } 817 kfree(ps); 818 return 0; 819} 820 821static int proc_control(struct dev_state *ps, void __user *arg) 822{ 823 struct usb_device *dev = ps->dev; 824 struct usbdevfs_ctrltransfer ctrl; 825 unsigned int tmo; 826 unsigned char *tbuf; 827 unsigned wLength; 828 int i, pipe, ret; 829 830 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 831 return -EFAULT; 832 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest, 833 ctrl.wIndex); 834 if (ret) 835 return ret; 836 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */ 837 if (wLength > PAGE_SIZE) 838 return -EINVAL; 839 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) + 840 sizeof(struct usb_ctrlrequest)); 841 if (ret) 842 return ret; 843 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL); 844 if (!tbuf) { 845 ret = -ENOMEM; 846 goto done; 847 } 848 tmo = ctrl.timeout; 849 snoop(&dev->dev, "control urb: bRequestType=%02x " 850 "bRequest=%02x wValue=%04x " 851 "wIndex=%04x wLength=%04x\n", 852 ctrl.bRequestType, ctrl.bRequest, 853 __le16_to_cpup(&ctrl.wValue), 854 __le16_to_cpup(&ctrl.wIndex), 855 __le16_to_cpup(&ctrl.wLength)); 856 if (ctrl.bRequestType & 0x80) { 857 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, 858 ctrl.wLength)) { 859 ret = -EINVAL; 860 goto done; 861 } 862 pipe = usb_rcvctrlpipe(dev, 0); 863 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0); 864 865 usb_unlock_device(dev); 866 i = usb_control_msg(dev, pipe, ctrl.bRequest, 867 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 868 tbuf, ctrl.wLength, tmo); 869 usb_lock_device(dev); 870 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, 871 tbuf, max(i, 0)); 872 if ((i > 0) && ctrl.wLength) { 873 if (copy_to_user(ctrl.data, tbuf, i)) { 874 ret = -EFAULT; 875 goto done; 876 } 877 } 878 } else { 879 if (ctrl.wLength) { 880 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) { 881 ret = -EFAULT; 882 goto done; 883 } 884 } 885 pipe = usb_sndctrlpipe(dev, 0); 886 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, 887 tbuf, ctrl.wLength); 888 889 usb_unlock_device(dev); 890 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, 891 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 892 tbuf, ctrl.wLength, tmo); 893 usb_lock_device(dev); 894 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0); 895 } 896 if (i < 0 && i != -EPIPE) { 897 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL " 898 "failed cmd %s rqt %u rq %u len %u ret %d\n", 899 current->comm, ctrl.bRequestType, ctrl.bRequest, 900 ctrl.wLength, i); 901 } 902 ret = i; 903 done: 904 free_page((unsigned long) tbuf); 905 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) + 906 sizeof(struct usb_ctrlrequest)); 907 return ret; 908} 909 910static int proc_bulk(struct dev_state *ps, void __user *arg) 911{ 912 struct usb_device *dev = ps->dev; 913 struct usbdevfs_bulktransfer bulk; 914 unsigned int tmo, len1, pipe; 915 int len2; 916 unsigned char *tbuf; 917 int i, ret; 918 919 if (copy_from_user(&bulk, arg, sizeof(bulk))) 920 return -EFAULT; 921 ret = findintfep(ps->dev, bulk.ep); 922 if (ret < 0) 923 return ret; 924 ret = checkintf(ps, ret); 925 if (ret) 926 return ret; 927 if (bulk.ep & USB_DIR_IN) 928 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f); 929 else 930 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f); 931 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN))) 932 return -EINVAL; 933 len1 = bulk.len; 934 if (len1 >= USBFS_XFER_MAX) 935 return -EINVAL; 936 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb)); 937 if (ret) 938 return ret; 939 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) { 940 ret = -ENOMEM; 941 goto done; 942 } 943 tmo = bulk.timeout; 944 if (bulk.ep & 0x80) { 945 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) { 946 ret = -EINVAL; 947 goto done; 948 } 949 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0); 950 951 usb_unlock_device(dev); 952 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 953 usb_lock_device(dev); 954 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2); 955 956 if (!i && len2) { 957 if (copy_to_user(bulk.data, tbuf, len2)) { 958 ret = -EFAULT; 959 goto done; 960 } 961 } 962 } else { 963 if (len1) { 964 if (copy_from_user(tbuf, bulk.data, len1)) { 965 ret = -EFAULT; 966 goto done; 967 } 968 } 969 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1); 970 971 usb_unlock_device(dev); 972 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 973 usb_lock_device(dev); 974 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0); 975 } 976 ret = (i < 0 ? i : len2); 977 done: 978 kfree(tbuf); 979 usbfs_decrease_memory_usage(len1 + sizeof(struct urb)); 980 return ret; 981} 982 983static int proc_resetep(struct dev_state *ps, void __user *arg) 984{ 985 unsigned int ep; 986 int ret; 987 988 if (get_user(ep, (unsigned int __user *)arg)) 989 return -EFAULT; 990 ret = findintfep(ps->dev, ep); 991 if (ret < 0) 992 return ret; 993 ret = checkintf(ps, ret); 994 if (ret) 995 return ret; 996 usb_reset_endpoint(ps->dev, ep); 997 return 0; 998} 999 1000static int proc_clearhalt(struct dev_state *ps, void __user *arg) 1001{ 1002 unsigned int ep; 1003 int pipe; 1004 int ret; 1005 1006 if (get_user(ep, (unsigned int __user *)arg)) 1007 return -EFAULT; 1008 ret = findintfep(ps->dev, ep); 1009 if (ret < 0) 1010 return ret; 1011 ret = checkintf(ps, ret); 1012 if (ret) 1013 return ret; 1014 if (ep & USB_DIR_IN) 1015 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f); 1016 else 1017 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f); 1018 1019 return usb_clear_halt(ps->dev, pipe); 1020} 1021 1022static int proc_getdriver(struct dev_state *ps, void __user *arg) 1023{ 1024 struct usbdevfs_getdriver gd; 1025 struct usb_interface *intf; 1026 int ret; 1027 1028 if (copy_from_user(&gd, arg, sizeof(gd))) 1029 return -EFAULT; 1030 intf = usb_ifnum_to_if(ps->dev, gd.interface); 1031 if (!intf || !intf->dev.driver) 1032 ret = -ENODATA; 1033 else { 1034 strncpy(gd.driver, intf->dev.driver->name, 1035 sizeof(gd.driver)); 1036 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0); 1037 } 1038 return ret; 1039} 1040 1041static int proc_connectinfo(struct dev_state *ps, void __user *arg) 1042{ 1043 struct usbdevfs_connectinfo ci = { 1044 .devnum = ps->dev->devnum, 1045 .slow = ps->dev->speed == USB_SPEED_LOW 1046 }; 1047 1048 if (copy_to_user(arg, &ci, sizeof(ci))) 1049 return -EFAULT; 1050 return 0; 1051} 1052 1053static int proc_resetdevice(struct dev_state *ps) 1054{ 1055 return usb_reset_device(ps->dev); 1056} 1057 1058static int proc_setintf(struct dev_state *ps, void __user *arg) 1059{ 1060 struct usbdevfs_setinterface setintf; 1061 int ret; 1062 1063 if (copy_from_user(&setintf, arg, sizeof(setintf))) 1064 return -EFAULT; 1065 if ((ret = checkintf(ps, setintf.interface))) 1066 return ret; 1067 return usb_set_interface(ps->dev, setintf.interface, 1068 setintf.altsetting); 1069} 1070 1071static int proc_setconfig(struct dev_state *ps, void __user *arg) 1072{ 1073 int u; 1074 int status = 0; 1075 struct usb_host_config *actconfig; 1076 1077 if (get_user(u, (int __user *)arg)) 1078 return -EFAULT; 1079 1080 actconfig = ps->dev->actconfig; 1081 1082 /* Don't touch the device if any interfaces are claimed. 1083 * It could interfere with other drivers' operations, and if 1084 * an interface is claimed by usbfs it could easily deadlock. 1085 */ 1086 if (actconfig) { 1087 int i; 1088 1089 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) { 1090 if (usb_interface_claimed(actconfig->interface[i])) { 1091 dev_warn(&ps->dev->dev, 1092 "usbfs: interface %d claimed by %s " 1093 "while '%s' sets config #%d\n", 1094 actconfig->interface[i] 1095 ->cur_altsetting 1096 ->desc.bInterfaceNumber, 1097 actconfig->interface[i] 1098 ->dev.driver->name, 1099 current->comm, u); 1100 status = -EBUSY; 1101 break; 1102 } 1103 } 1104 } 1105 1106 /* SET_CONFIGURATION is often abused as a "cheap" driver reset, 1107 * so avoid usb_set_configuration()'s kick to sysfs 1108 */ 1109 if (status == 0) { 1110 if (actconfig && actconfig->desc.bConfigurationValue == u) 1111 status = usb_reset_configuration(ps->dev); 1112 else 1113 status = usb_set_configuration(ps->dev, u); 1114 } 1115 1116 return status; 1117} 1118 1119static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb, 1120 struct usbdevfs_iso_packet_desc __user *iso_frame_desc, 1121 void __user *arg) 1122{ 1123 struct usbdevfs_iso_packet_desc *isopkt = NULL; 1124 struct usb_host_endpoint *ep; 1125 struct async *as = NULL; 1126 struct usb_ctrlrequest *dr = NULL; 1127 unsigned int u, totlen, isofrmlen; 1128 int ret, ifnum = -1; 1129 int is_in; 1130 1131 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP | 1132 USBDEVFS_URB_SHORT_NOT_OK | 1133 USBDEVFS_URB_BULK_CONTINUATION | 1134 USBDEVFS_URB_NO_FSBR | 1135 USBDEVFS_URB_ZERO_PACKET | 1136 USBDEVFS_URB_NO_INTERRUPT)) 1137 return -EINVAL; 1138 if (uurb->buffer_length > 0 && !uurb->buffer) 1139 return -EINVAL; 1140 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && 1141 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) { 1142 ifnum = findintfep(ps->dev, uurb->endpoint); 1143 if (ifnum < 0) 1144 return ifnum; 1145 ret = checkintf(ps, ifnum); 1146 if (ret) 1147 return ret; 1148 } 1149 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) { 1150 is_in = 1; 1151 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 1152 } else { 1153 is_in = 0; 1154 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 1155 } 1156 if (!ep) 1157 return -ENOENT; 1158 1159 u = 0; 1160 switch(uurb->type) { 1161 case USBDEVFS_URB_TYPE_CONTROL: 1162 if (!usb_endpoint_xfer_control(&ep->desc)) 1163 return -EINVAL; 1164 /* min 8 byte setup packet */ 1165 if (uurb->buffer_length < 8) 1166 return -EINVAL; 1167 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); 1168 if (!dr) 1169 return -ENOMEM; 1170 if (copy_from_user(dr, uurb->buffer, 8)) { 1171 ret = -EFAULT; 1172 goto error; 1173 } 1174 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) { 1175 ret = -EINVAL; 1176 goto error; 1177 } 1178 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest, 1179 le16_to_cpup(&dr->wIndex)); 1180 if (ret) 1181 goto error; 1182 uurb->number_of_packets = 0; 1183 uurb->buffer_length = le16_to_cpup(&dr->wLength); 1184 uurb->buffer += 8; 1185 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) { 1186 is_in = 1; 1187 uurb->endpoint |= USB_DIR_IN; 1188 } else { 1189 is_in = 0; 1190 uurb->endpoint &= ~USB_DIR_IN; 1191 } 1192 snoop(&ps->dev->dev, "control urb: bRequestType=%02x " 1193 "bRequest=%02x wValue=%04x " 1194 "wIndex=%04x wLength=%04x\n", 1195 dr->bRequestType, dr->bRequest, 1196 __le16_to_cpup(&dr->wValue), 1197 __le16_to_cpup(&dr->wIndex), 1198 __le16_to_cpup(&dr->wLength)); 1199 u = sizeof(struct usb_ctrlrequest); 1200 break; 1201 1202 case USBDEVFS_URB_TYPE_BULK: 1203 switch (usb_endpoint_type(&ep->desc)) { 1204 case USB_ENDPOINT_XFER_CONTROL: 1205 case USB_ENDPOINT_XFER_ISOC: 1206 return -EINVAL; 1207 case USB_ENDPOINT_XFER_INT: 1208 /* allow single-shot interrupt transfers */ 1209 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT; 1210 goto interrupt_urb; 1211 } 1212 uurb->number_of_packets = 0; 1213 break; 1214 1215 case USBDEVFS_URB_TYPE_INTERRUPT: 1216 if (!usb_endpoint_xfer_int(&ep->desc)) 1217 return -EINVAL; 1218 interrupt_urb: 1219 uurb->number_of_packets = 0; 1220 break; 1221 1222 case USBDEVFS_URB_TYPE_ISO: 1223 /* arbitrary limit */ 1224 if (uurb->number_of_packets < 1 || 1225 uurb->number_of_packets > 128) 1226 return -EINVAL; 1227 if (!usb_endpoint_xfer_isoc(&ep->desc)) 1228 return -EINVAL; 1229 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * 1230 uurb->number_of_packets; 1231 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL))) 1232 return -ENOMEM; 1233 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) { 1234 ret = -EFAULT; 1235 goto error; 1236 } 1237 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1238 /* arbitrary limit, 1239 * sufficient for USB 2.0 high-bandwidth iso */ 1240 if (isopkt[u].length > 8192) { 1241 ret = -EINVAL; 1242 goto error; 1243 } 1244 totlen += isopkt[u].length; 1245 } 1246 u *= sizeof(struct usb_iso_packet_descriptor); 1247 uurb->buffer_length = totlen; 1248 break; 1249 1250 default: 1251 return -EINVAL; 1252 } 1253 1254 if (uurb->buffer_length >= USBFS_XFER_MAX) { 1255 ret = -EINVAL; 1256 goto error; 1257 } 1258 if (uurb->buffer_length > 0 && 1259 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1260 uurb->buffer, uurb->buffer_length)) { 1261 ret = -EFAULT; 1262 goto error; 1263 } 1264 as = alloc_async(uurb->number_of_packets); 1265 if (!as) { 1266 ret = -ENOMEM; 1267 goto error; 1268 } 1269 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length; 1270 ret = usbfs_increase_memory_usage(u); 1271 if (ret) 1272 goto error; 1273 as->mem_usage = u; 1274 1275 if (uurb->buffer_length > 0) { 1276 as->urb->transfer_buffer = kmalloc(uurb->buffer_length, 1277 GFP_KERNEL); 1278 if (!as->urb->transfer_buffer) { 1279 ret = -ENOMEM; 1280 goto error; 1281 } 1282 /* Isochronous input data may end up being discontiguous 1283 * if some of the packets are short. Clear the buffer so 1284 * that the gaps don't leak kernel data to userspace. 1285 */ 1286 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO) 1287 memset(as->urb->transfer_buffer, 0, 1288 uurb->buffer_length); 1289 } 1290 as->urb->dev = ps->dev; 1291 as->urb->pipe = (uurb->type << 30) | 1292 __create_pipe(ps->dev, uurb->endpoint & 0xf) | 1293 (uurb->endpoint & USB_DIR_IN); 1294 1295 /* This tedious sequence is necessary because the URB_* flags 1296 * are internal to the kernel and subject to change, whereas 1297 * the USBDEVFS_URB_* flags are a user API and must not be changed. 1298 */ 1299 u = (is_in ? URB_DIR_IN : URB_DIR_OUT); 1300 if (uurb->flags & USBDEVFS_URB_ISO_ASAP) 1301 u |= URB_ISO_ASAP; 1302 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK) 1303 u |= URB_SHORT_NOT_OK; 1304 if (uurb->flags & USBDEVFS_URB_NO_FSBR) 1305 u |= URB_NO_FSBR; 1306 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET) 1307 u |= URB_ZERO_PACKET; 1308 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT) 1309 u |= URB_NO_INTERRUPT; 1310 as->urb->transfer_flags = u; 1311 1312 as->urb->transfer_buffer_length = uurb->buffer_length; 1313 as->urb->setup_packet = (unsigned char *)dr; 1314 dr = NULL; 1315 as->urb->start_frame = uurb->start_frame; 1316 as->urb->number_of_packets = uurb->number_of_packets; 1317 if (uurb->type == USBDEVFS_URB_TYPE_ISO || 1318 ps->dev->speed == USB_SPEED_HIGH) 1319 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1); 1320 else 1321 as->urb->interval = ep->desc.bInterval; 1322 as->urb->context = as; 1323 as->urb->complete = async_completed; 1324 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1325 as->urb->iso_frame_desc[u].offset = totlen; 1326 as->urb->iso_frame_desc[u].length = isopkt[u].length; 1327 totlen += isopkt[u].length; 1328 } 1329 kfree(isopkt); 1330 isopkt = NULL; 1331 as->ps = ps; 1332 as->userurb = arg; 1333 if (is_in && uurb->buffer_length > 0) 1334 as->userbuffer = uurb->buffer; 1335 else 1336 as->userbuffer = NULL; 1337 as->signr = uurb->signr; 1338 as->ifnum = ifnum; 1339 as->pid = get_pid(task_pid(current)); 1340 as->cred = get_current_cred(); 1341 security_task_getsecid(current, &as->secid); 1342 if (!is_in && uurb->buffer_length > 0) { 1343 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, 1344 uurb->buffer_length)) { 1345 ret = -EFAULT; 1346 goto error; 1347 } 1348 } 1349 snoop_urb(ps->dev, as->userurb, as->urb->pipe, 1350 as->urb->transfer_buffer_length, 0, SUBMIT, 1351 is_in ? NULL : as->urb->transfer_buffer, 1352 uurb->buffer_length); 1353 async_newpending(as); 1354 1355 if (usb_endpoint_xfer_bulk(&ep->desc)) { 1356 spin_lock_irq(&ps->lock); 1357 1358 /* Not exactly the endpoint address; the direction bit is 1359 * shifted to the 0x10 position so that the value will be 1360 * between 0 and 31. 1361 */ 1362 as->bulk_addr = usb_endpoint_num(&ep->desc) | 1363 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK) 1364 >> 3); 1365 1366 /* If this bulk URB is the start of a new transfer, re-enable 1367 * the endpoint. Otherwise mark it as a continuation URB. 1368 */ 1369 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION) 1370 as->bulk_status = AS_CONTINUATION; 1371 else 1372 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr); 1373 1374 /* Don't accept continuation URBs if the endpoint is 1375 * disabled because of an earlier error. 1376 */ 1377 if (ps->disabled_bulk_eps & (1 << as->bulk_addr)) 1378 ret = -EREMOTEIO; 1379 else 1380 ret = usb_submit_urb(as->urb, GFP_ATOMIC); 1381 spin_unlock_irq(&ps->lock); 1382 } else { 1383 ret = usb_submit_urb(as->urb, GFP_KERNEL); 1384 } 1385 1386 if (ret) { 1387 dev_printk(KERN_DEBUG, &ps->dev->dev, 1388 "usbfs: usb_submit_urb returned %d\n", ret); 1389 snoop_urb(ps->dev, as->userurb, as->urb->pipe, 1390 0, ret, COMPLETE, NULL, 0); 1391 async_removepending(as); 1392 goto error; 1393 } 1394 return 0; 1395 1396 error: 1397 kfree(isopkt); 1398 kfree(dr); 1399 if (as) 1400 free_async(as); 1401 return ret; 1402} 1403 1404static int proc_submiturb(struct dev_state *ps, void __user *arg) 1405{ 1406 struct usbdevfs_urb uurb; 1407 1408 if (copy_from_user(&uurb, arg, sizeof(uurb))) 1409 return -EFAULT; 1410 1411 return proc_do_submiturb(ps, &uurb, 1412 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), 1413 arg); 1414} 1415 1416static int proc_unlinkurb(struct dev_state *ps, void __user *arg) 1417{ 1418 struct urb *urb; 1419 struct async *as; 1420 unsigned long flags; 1421 1422 spin_lock_irqsave(&ps->lock, flags); 1423 as = async_getpending(ps, arg); 1424 if (!as) { 1425 spin_unlock_irqrestore(&ps->lock, flags); 1426 return -EINVAL; 1427 } 1428 1429 urb = as->urb; 1430 usb_get_urb(urb); 1431 spin_unlock_irqrestore(&ps->lock, flags); 1432 1433 usb_kill_urb(urb); 1434 usb_put_urb(urb); 1435 1436 return 0; 1437} 1438 1439static int processcompl(struct async *as, void __user * __user *arg) 1440{ 1441 struct urb *urb = as->urb; 1442 struct usbdevfs_urb __user *userurb = as->userurb; 1443 void __user *addr = as->userurb; 1444 unsigned int i; 1445 1446 if (as->userbuffer && urb->actual_length) { 1447 if (urb->number_of_packets > 0) /* Isochronous */ 1448 i = urb->transfer_buffer_length; 1449 else /* Non-Isoc */ 1450 i = urb->actual_length; 1451 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i)) 1452 goto err_out; 1453 } 1454 if (put_user(as->status, &userurb->status)) 1455 goto err_out; 1456 if (put_user(urb->actual_length, &userurb->actual_length)) 1457 goto err_out; 1458 if (put_user(urb->error_count, &userurb->error_count)) 1459 goto err_out; 1460 1461 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1462 for (i = 0; i < urb->number_of_packets; i++) { 1463 if (put_user(urb->iso_frame_desc[i].actual_length, 1464 &userurb->iso_frame_desc[i].actual_length)) 1465 goto err_out; 1466 if (put_user(urb->iso_frame_desc[i].status, 1467 &userurb->iso_frame_desc[i].status)) 1468 goto err_out; 1469 } 1470 } 1471 1472 if (put_user(addr, (void __user * __user *)arg)) 1473 return -EFAULT; 1474 return 0; 1475 1476err_out: 1477 return -EFAULT; 1478} 1479 1480static struct async *reap_as(struct dev_state *ps) 1481{ 1482 DECLARE_WAITQUEUE(wait, current); 1483 struct async *as = NULL; 1484 struct usb_device *dev = ps->dev; 1485 1486 add_wait_queue(&ps->wait, &wait); 1487 for (;;) { 1488 __set_current_state(TASK_INTERRUPTIBLE); 1489 as = async_getcompleted(ps); 1490 if (as) 1491 break; 1492 if (signal_pending(current)) 1493 break; 1494 usb_unlock_device(dev); 1495 schedule(); 1496 usb_lock_device(dev); 1497 } 1498 remove_wait_queue(&ps->wait, &wait); 1499 set_current_state(TASK_RUNNING); 1500 return as; 1501} 1502 1503static int proc_reapurb(struct dev_state *ps, void __user *arg) 1504{ 1505 struct async *as = reap_as(ps); 1506 if (as) { 1507 int retval = processcompl(as, (void __user * __user *)arg); 1508 free_async(as); 1509 return retval; 1510 } 1511 if (signal_pending(current)) 1512 return -EINTR; 1513 return -EIO; 1514} 1515 1516static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg) 1517{ 1518 int retval; 1519 struct async *as; 1520 1521 as = async_getcompleted(ps); 1522 retval = -EAGAIN; 1523 if (as) { 1524 retval = processcompl(as, (void __user * __user *)arg); 1525 free_async(as); 1526 } 1527 return retval; 1528} 1529 1530#ifdef CONFIG_COMPAT 1531static int proc_control_compat(struct dev_state *ps, 1532 struct usbdevfs_ctrltransfer32 __user *p32) 1533{ 1534 struct usbdevfs_ctrltransfer __user *p; 1535 __u32 udata; 1536 p = compat_alloc_user_space(sizeof(*p)); 1537 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) || 1538 get_user(udata, &p32->data) || 1539 put_user(compat_ptr(udata), &p->data)) 1540 return -EFAULT; 1541 return proc_control(ps, p); 1542} 1543 1544static int proc_bulk_compat(struct dev_state *ps, 1545 struct usbdevfs_bulktransfer32 __user *p32) 1546{ 1547 struct usbdevfs_bulktransfer __user *p; 1548 compat_uint_t n; 1549 compat_caddr_t addr; 1550 1551 p = compat_alloc_user_space(sizeof(*p)); 1552 1553 if (get_user(n, &p32->ep) || put_user(n, &p->ep) || 1554 get_user(n, &p32->len) || put_user(n, &p->len) || 1555 get_user(n, &p32->timeout) || put_user(n, &p->timeout) || 1556 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data)) 1557 return -EFAULT; 1558 1559 return proc_bulk(ps, p); 1560} 1561static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg) 1562{ 1563 struct usbdevfs_disconnectsignal32 ds; 1564 1565 if (copy_from_user(&ds, arg, sizeof(ds))) 1566 return -EFAULT; 1567 ps->discsignr = ds.signr; 1568 ps->disccontext = compat_ptr(ds.context); 1569 return 0; 1570} 1571 1572static int get_urb32(struct usbdevfs_urb *kurb, 1573 struct usbdevfs_urb32 __user *uurb) 1574{ 1575 __u32 uptr; 1576 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) || 1577 __get_user(kurb->type, &uurb->type) || 1578 __get_user(kurb->endpoint, &uurb->endpoint) || 1579 __get_user(kurb->status, &uurb->status) || 1580 __get_user(kurb->flags, &uurb->flags) || 1581 __get_user(kurb->buffer_length, &uurb->buffer_length) || 1582 __get_user(kurb->actual_length, &uurb->actual_length) || 1583 __get_user(kurb->start_frame, &uurb->start_frame) || 1584 __get_user(kurb->number_of_packets, &uurb->number_of_packets) || 1585 __get_user(kurb->error_count, &uurb->error_count) || 1586 __get_user(kurb->signr, &uurb->signr)) 1587 return -EFAULT; 1588 1589 if (__get_user(uptr, &uurb->buffer)) 1590 return -EFAULT; 1591 kurb->buffer = compat_ptr(uptr); 1592 if (__get_user(uptr, &uurb->usercontext)) 1593 return -EFAULT; 1594 kurb->usercontext = compat_ptr(uptr); 1595 1596 return 0; 1597} 1598 1599static int proc_submiturb_compat(struct dev_state *ps, void __user *arg) 1600{ 1601 struct usbdevfs_urb uurb; 1602 1603 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg)) 1604 return -EFAULT; 1605 1606 return proc_do_submiturb(ps, &uurb, 1607 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, 1608 arg); 1609} 1610 1611static int processcompl_compat(struct async *as, void __user * __user *arg) 1612{ 1613 struct urb *urb = as->urb; 1614 struct usbdevfs_urb32 __user *userurb = as->userurb; 1615 void __user *addr = as->userurb; 1616 unsigned int i; 1617 1618 if (as->userbuffer && urb->actual_length) 1619 if (copy_to_user(as->userbuffer, urb->transfer_buffer, 1620 urb->actual_length)) 1621 return -EFAULT; 1622 if (put_user(as->status, &userurb->status)) 1623 return -EFAULT; 1624 if (put_user(urb->actual_length, &userurb->actual_length)) 1625 return -EFAULT; 1626 if (put_user(urb->error_count, &userurb->error_count)) 1627 return -EFAULT; 1628 1629 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1630 for (i = 0; i < urb->number_of_packets; i++) { 1631 if (put_user(urb->iso_frame_desc[i].actual_length, 1632 &userurb->iso_frame_desc[i].actual_length)) 1633 return -EFAULT; 1634 if (put_user(urb->iso_frame_desc[i].status, 1635 &userurb->iso_frame_desc[i].status)) 1636 return -EFAULT; 1637 } 1638 } 1639 1640 if (put_user(ptr_to_compat(addr), (u32 __user *)arg)) 1641 return -EFAULT; 1642 return 0; 1643} 1644 1645static int proc_reapurb_compat(struct dev_state *ps, void __user *arg) 1646{ 1647 struct async *as = reap_as(ps); 1648 if (as) { 1649 int retval = processcompl_compat(as, (void __user * __user *)arg); 1650 free_async(as); 1651 return retval; 1652 } 1653 if (signal_pending(current)) 1654 return -EINTR; 1655 return -EIO; 1656} 1657 1658static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg) 1659{ 1660 int retval; 1661 struct async *as; 1662 1663 retval = -EAGAIN; 1664 as = async_getcompleted(ps); 1665 if (as) { 1666 retval = processcompl_compat(as, (void __user * __user *)arg); 1667 free_async(as); 1668 } 1669 return retval; 1670} 1671 1672 1673#endif 1674 1675static int proc_disconnectsignal(struct dev_state *ps, void __user *arg) 1676{ 1677 struct usbdevfs_disconnectsignal ds; 1678 1679 if (copy_from_user(&ds, arg, sizeof(ds))) 1680 return -EFAULT; 1681 ps->discsignr = ds.signr; 1682 ps->disccontext = ds.context; 1683 return 0; 1684} 1685 1686static int proc_claiminterface(struct dev_state *ps, void __user *arg) 1687{ 1688 unsigned int ifnum; 1689 1690 if (get_user(ifnum, (unsigned int __user *)arg)) 1691 return -EFAULT; 1692 return claimintf(ps, ifnum); 1693} 1694 1695static int proc_releaseinterface(struct dev_state *ps, void __user *arg) 1696{ 1697 unsigned int ifnum; 1698 int ret; 1699 1700 if (get_user(ifnum, (unsigned int __user *)arg)) 1701 return -EFAULT; 1702 if ((ret = releaseintf(ps, ifnum)) < 0) 1703 return ret; 1704 destroy_async_on_interface (ps, ifnum); 1705 return 0; 1706} 1707 1708static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl) 1709{ 1710 int size; 1711 void *buf = NULL; 1712 int retval = 0; 1713 struct usb_interface *intf = NULL; 1714 struct usb_driver *driver = NULL; 1715 1716 /* alloc buffer */ 1717 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) { 1718 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL) 1719 return -ENOMEM; 1720 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) { 1721 if (copy_from_user(buf, ctl->data, size)) { 1722 kfree(buf); 1723 return -EFAULT; 1724 } 1725 } else { 1726 memset(buf, 0, size); 1727 } 1728 } 1729 1730 if (!connected(ps)) { 1731 kfree(buf); 1732 return -ENODEV; 1733 } 1734 1735 if (ps->dev->state != USB_STATE_CONFIGURED) 1736 retval = -EHOSTUNREACH; 1737 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno))) 1738 retval = -EINVAL; 1739 else switch (ctl->ioctl_code) { 1740 1741 /* disconnect kernel driver from interface */ 1742 case USBDEVFS_DISCONNECT: 1743 if (intf->dev.driver) { 1744 driver = to_usb_driver(intf->dev.driver); 1745 dev_dbg(&intf->dev, "disconnect by usbfs\n"); 1746 usb_driver_release_interface(driver, intf); 1747 } else 1748 retval = -ENODATA; 1749 break; 1750 1751 /* let kernel drivers try to (re)bind to the interface */ 1752 case USBDEVFS_CONNECT: 1753 if (!intf->dev.driver) 1754 retval = device_attach(&intf->dev); 1755 else 1756 retval = -EBUSY; 1757 break; 1758 1759 /* talk directly to the interface's driver */ 1760 default: 1761 if (intf->dev.driver) 1762 driver = to_usb_driver(intf->dev.driver); 1763 if (driver == NULL || driver->unlocked_ioctl == NULL) { 1764 retval = -ENOTTY; 1765 } else { 1766 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf); 1767 if (retval == -ENOIOCTLCMD) 1768 retval = -ENOTTY; 1769 } 1770 } 1771 1772 /* cleanup and return */ 1773 if (retval >= 0 1774 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0 1775 && size > 0 1776 && copy_to_user(ctl->data, buf, size) != 0) 1777 retval = -EFAULT; 1778 1779 kfree(buf); 1780 return retval; 1781} 1782 1783static int proc_ioctl_default(struct dev_state *ps, void __user *arg) 1784{ 1785 struct usbdevfs_ioctl ctrl; 1786 1787 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 1788 return -EFAULT; 1789 return proc_ioctl(ps, &ctrl); 1790} 1791 1792#ifdef CONFIG_COMPAT 1793static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg) 1794{ 1795 struct usbdevfs_ioctl32 __user *uioc; 1796 struct usbdevfs_ioctl ctrl; 1797 u32 udata; 1798 1799 uioc = compat_ptr((long)arg); 1800 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) || 1801 __get_user(ctrl.ifno, &uioc->ifno) || 1802 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) || 1803 __get_user(udata, &uioc->data)) 1804 return -EFAULT; 1805 ctrl.data = compat_ptr(udata); 1806 1807 return proc_ioctl(ps, &ctrl); 1808} 1809#endif 1810 1811static int proc_claim_port(struct dev_state *ps, void __user *arg) 1812{ 1813 unsigned portnum; 1814 int rc; 1815 1816 if (get_user(portnum, (unsigned __user *) arg)) 1817 return -EFAULT; 1818 rc = usb_hub_claim_port(ps->dev, portnum, ps); 1819 if (rc == 0) 1820 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n", 1821 portnum, task_pid_nr(current), current->comm); 1822 return rc; 1823} 1824 1825static int proc_release_port(struct dev_state *ps, void __user *arg) 1826{ 1827 unsigned portnum; 1828 1829 if (get_user(portnum, (unsigned __user *) arg)) 1830 return -EFAULT; 1831 return usb_hub_release_port(ps->dev, portnum, ps); 1832} 1833 1834/* 1835 * NOTE: All requests here that have interface numbers as parameters 1836 * are assuming that somehow the configuration has been prevented from 1837 * changing. But there's no mechanism to ensure that... 1838 */ 1839static long usbdev_do_ioctl(struct file *file, unsigned int cmd, 1840 void __user *p) 1841{ 1842 struct dev_state *ps = file->private_data; 1843 struct inode *inode = file->f_path.dentry->d_inode; 1844 struct usb_device *dev = ps->dev; 1845 int ret = -ENOTTY; 1846 1847 if (!(file->f_mode & FMODE_WRITE)) 1848 return -EPERM; 1849 1850 usb_lock_device(dev); 1851 if (!connected(ps)) { 1852 usb_unlock_device(dev); 1853 return -ENODEV; 1854 } 1855 1856 switch (cmd) { 1857 case USBDEVFS_CONTROL: 1858 snoop(&dev->dev, "%s: CONTROL\n", __func__); 1859 ret = proc_control(ps, p); 1860 if (ret >= 0) 1861 inode->i_mtime = CURRENT_TIME; 1862 break; 1863 1864 case USBDEVFS_BULK: 1865 snoop(&dev->dev, "%s: BULK\n", __func__); 1866 ret = proc_bulk(ps, p); 1867 if (ret >= 0) 1868 inode->i_mtime = CURRENT_TIME; 1869 break; 1870 1871 case USBDEVFS_RESETEP: 1872 snoop(&dev->dev, "%s: RESETEP\n", __func__); 1873 ret = proc_resetep(ps, p); 1874 if (ret >= 0) 1875 inode->i_mtime = CURRENT_TIME; 1876 break; 1877 1878 case USBDEVFS_RESET: 1879 snoop(&dev->dev, "%s: RESET\n", __func__); 1880 ret = proc_resetdevice(ps); 1881 break; 1882 1883 case USBDEVFS_CLEAR_HALT: 1884 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__); 1885 ret = proc_clearhalt(ps, p); 1886 if (ret >= 0) 1887 inode->i_mtime = CURRENT_TIME; 1888 break; 1889 1890 case USBDEVFS_GETDRIVER: 1891 snoop(&dev->dev, "%s: GETDRIVER\n", __func__); 1892 ret = proc_getdriver(ps, p); 1893 break; 1894 1895 case USBDEVFS_CONNECTINFO: 1896 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__); 1897 ret = proc_connectinfo(ps, p); 1898 break; 1899 1900 case USBDEVFS_SETINTERFACE: 1901 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__); 1902 ret = proc_setintf(ps, p); 1903 break; 1904 1905 case USBDEVFS_SETCONFIGURATION: 1906 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__); 1907 ret = proc_setconfig(ps, p); 1908 break; 1909 1910 case USBDEVFS_SUBMITURB: 1911 snoop(&dev->dev, "%s: SUBMITURB\n", __func__); 1912 ret = proc_submiturb(ps, p); 1913 if (ret >= 0) 1914 inode->i_mtime = CURRENT_TIME; 1915 break; 1916 1917#ifdef CONFIG_COMPAT 1918 case USBDEVFS_CONTROL32: 1919 snoop(&dev->dev, "%s: CONTROL32\n", __func__); 1920 ret = proc_control_compat(ps, p); 1921 if (ret >= 0) 1922 inode->i_mtime = CURRENT_TIME; 1923 break; 1924 1925 case USBDEVFS_BULK32: 1926 snoop(&dev->dev, "%s: BULK32\n", __func__); 1927 ret = proc_bulk_compat(ps, p); 1928 if (ret >= 0) 1929 inode->i_mtime = CURRENT_TIME; 1930 break; 1931 1932 case USBDEVFS_DISCSIGNAL32: 1933 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__); 1934 ret = proc_disconnectsignal_compat(ps, p); 1935 break; 1936 1937 case USBDEVFS_SUBMITURB32: 1938 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__); 1939 ret = proc_submiturb_compat(ps, p); 1940 if (ret >= 0) 1941 inode->i_mtime = CURRENT_TIME; 1942 break; 1943 1944 case USBDEVFS_REAPURB32: 1945 snoop(&dev->dev, "%s: REAPURB32\n", __func__); 1946 ret = proc_reapurb_compat(ps, p); 1947 break; 1948 1949 case USBDEVFS_REAPURBNDELAY32: 1950 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__); 1951 ret = proc_reapurbnonblock_compat(ps, p); 1952 break; 1953 1954 case USBDEVFS_IOCTL32: 1955 snoop(&dev->dev, "%s: IOCTL32\n", __func__); 1956 ret = proc_ioctl_compat(ps, ptr_to_compat(p)); 1957 break; 1958#endif 1959 1960 case USBDEVFS_DISCARDURB: 1961 snoop(&dev->dev, "%s: DISCARDURB\n", __func__); 1962 ret = proc_unlinkurb(ps, p); 1963 break; 1964 1965 case USBDEVFS_REAPURB: 1966 snoop(&dev->dev, "%s: REAPURB\n", __func__); 1967 ret = proc_reapurb(ps, p); 1968 break; 1969 1970 case USBDEVFS_REAPURBNDELAY: 1971 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__); 1972 ret = proc_reapurbnonblock(ps, p); 1973 break; 1974 1975 case USBDEVFS_DISCSIGNAL: 1976 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__); 1977 ret = proc_disconnectsignal(ps, p); 1978 break; 1979 1980 case USBDEVFS_CLAIMINTERFACE: 1981 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__); 1982 ret = proc_claiminterface(ps, p); 1983 break; 1984 1985 case USBDEVFS_RELEASEINTERFACE: 1986 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__); 1987 ret = proc_releaseinterface(ps, p); 1988 break; 1989 1990 case USBDEVFS_IOCTL: 1991 snoop(&dev->dev, "%s: IOCTL\n", __func__); 1992 ret = proc_ioctl_default(ps, p); 1993 break; 1994 1995 case USBDEVFS_CLAIM_PORT: 1996 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__); 1997 ret = proc_claim_port(ps, p); 1998 break; 1999 2000 case USBDEVFS_RELEASE_PORT: 2001 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__); 2002 ret = proc_release_port(ps, p); 2003 break; 2004 } 2005 usb_unlock_device(dev); 2006 if (ret >= 0) 2007 inode->i_atime = CURRENT_TIME; 2008 return ret; 2009} 2010 2011static long usbdev_ioctl(struct file *file, unsigned int cmd, 2012 unsigned long arg) 2013{ 2014 int ret; 2015 2016 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg); 2017 2018 return ret; 2019} 2020 2021#ifdef CONFIG_COMPAT 2022static long usbdev_compat_ioctl(struct file *file, unsigned int cmd, 2023 unsigned long arg) 2024{ 2025 int ret; 2026 2027 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg)); 2028 2029 return ret; 2030} 2031#endif 2032 2033/* No kernel lock - fine */ 2034static unsigned int usbdev_poll(struct file *file, 2035 struct poll_table_struct *wait) 2036{ 2037 struct dev_state *ps = file->private_data; 2038 unsigned int mask = 0; 2039 2040 poll_wait(file, &ps->wait, wait); 2041 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed)) 2042 mask |= POLLOUT | POLLWRNORM; 2043 if (!connected(ps)) 2044 mask |= POLLERR | POLLHUP; 2045 return mask; 2046} 2047 2048const struct file_operations usbdev_file_operations = { 2049 .owner = THIS_MODULE, 2050 .llseek = usbdev_lseek, 2051 .read = usbdev_read, 2052 .poll = usbdev_poll, 2053 .unlocked_ioctl = usbdev_ioctl, 2054#ifdef CONFIG_COMPAT 2055 .compat_ioctl = usbdev_compat_ioctl, 2056#endif 2057 .open = usbdev_open, 2058 .release = usbdev_release, 2059}; 2060 2061static void usbdev_remove(struct usb_device *udev) 2062{ 2063 struct dev_state *ps; 2064 struct siginfo sinfo; 2065 2066 while (!list_empty(&udev->filelist)) { 2067 ps = list_entry(udev->filelist.next, struct dev_state, list); 2068 destroy_all_async(ps); 2069 wake_up_all(&ps->wait); 2070 list_del_init(&ps->list); 2071 if (ps->discsignr) { 2072 sinfo.si_signo = ps->discsignr; 2073 sinfo.si_errno = EPIPE; 2074 sinfo.si_code = SI_ASYNCIO; 2075 sinfo.si_addr = ps->disccontext; 2076 kill_pid_info_as_cred(ps->discsignr, &sinfo, 2077 ps->disc_pid, ps->cred, ps->secid); 2078 } 2079 } 2080} 2081 2082#ifdef CONFIG_USB_DEVICE_CLASS 2083static struct class *usb_classdev_class; 2084 2085static int usb_classdev_add(struct usb_device *dev) 2086{ 2087 struct device *cldev; 2088 2089 cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt, 2090 NULL, "usbdev%d.%d", dev->bus->busnum, 2091 dev->devnum); 2092 if (IS_ERR(cldev)) 2093 return PTR_ERR(cldev); 2094 dev->usb_classdev = cldev; 2095 return 0; 2096} 2097 2098static void usb_classdev_remove(struct usb_device *dev) 2099{ 2100 if (dev->usb_classdev) 2101 device_unregister(dev->usb_classdev); 2102} 2103 2104#else 2105#define usb_classdev_add(dev) 0 2106#define usb_classdev_remove(dev) do {} while (0) 2107 2108#endif 2109 2110static int usbdev_notify(struct notifier_block *self, 2111 unsigned long action, void *dev) 2112{ 2113 switch (action) { 2114 case USB_DEVICE_ADD: 2115 if (usb_classdev_add(dev)) 2116 return NOTIFY_BAD; 2117 break; 2118 case USB_DEVICE_REMOVE: 2119 usb_classdev_remove(dev); 2120 usbdev_remove(dev); 2121 break; 2122 } 2123 return NOTIFY_OK; 2124} 2125 2126static struct notifier_block usbdev_nb = { 2127 .notifier_call = usbdev_notify, 2128}; 2129 2130static struct cdev usb_device_cdev; 2131 2132int __init usb_devio_init(void) 2133{ 2134 int retval; 2135 2136 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX, 2137 "usb_device"); 2138 if (retval) { 2139 printk(KERN_ERR "Unable to register minors for usb_device\n"); 2140 goto out; 2141 } 2142 cdev_init(&usb_device_cdev, &usbdev_file_operations); 2143 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX); 2144 if (retval) { 2145 printk(KERN_ERR "Unable to get usb_device major %d\n", 2146 USB_DEVICE_MAJOR); 2147 goto error_cdev; 2148 } 2149#ifdef CONFIG_USB_DEVICE_CLASS 2150 usb_classdev_class = class_create(THIS_MODULE, "usb_device"); 2151 if (IS_ERR(usb_classdev_class)) { 2152 printk(KERN_ERR "Unable to register usb_device class\n"); 2153 retval = PTR_ERR(usb_classdev_class); 2154 cdev_del(&usb_device_cdev); 2155 usb_classdev_class = NULL; 2156 goto out; 2157 } 2158 /* devices of this class shadow the major:minor of their parent 2159 * device, so clear ->dev_kobj to prevent adding duplicate entries 2160 * to /sys/dev 2161 */ 2162 usb_classdev_class->dev_kobj = NULL; 2163#endif 2164 usb_register_notify(&usbdev_nb); 2165out: 2166 return retval; 2167 2168error_cdev: 2169 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 2170 goto out; 2171} 2172 2173void usb_devio_cleanup(void) 2174{ 2175 usb_unregister_notify(&usbdev_nb); 2176#ifdef CONFIG_USB_DEVICE_CLASS 2177 class_destroy(usb_classdev_class); 2178#endif 2179 cdev_del(&usb_device_cdev); 2180 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 2181} 2182