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 * $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $ 23 * 24 * This file implements the usbfs/x/y files, where 25 * x is the bus number and y the device number. 26 * 27 * It allows user space programs/"drivers" to communicate directly 28 * with USB devices without intervening kernel driver. 29 * 30 * Revision history 31 * 22.12.1999 0.1 Initial release (split from proc_usb.c) 32 * 04.01.2000 0.2 Turned into its own filesystem 33 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery 34 * (CAN-2005-3055) 35 */ 36 37 /*****************************************************************************/ 38 39 #include <linux/fs.h> 40 #include <linux/mm.h> 41 #include <linux/slab.h> 42 #include <linux/smp_lock.h> 43 #include <linux/signal.h> 44 #include <linux/poll.h> 45 #include <linux/module.h> 46 #include <linux/usb.h> 47 #include <linux/usbdevice_fs.h> 48 #include <linux/cdev.h> 49 #include <linux/notifier.h> 50 #include <linux/security.h> 51 #include <asm/uaccess.h> 52 #include <asm/byteorder.h> 53 #include <linux/moduleparam.h> 54 55 #include "hcd.h" /* for usbcore internals */ 56 #include "usb.h" 57 58 #define USB_MAXBUS 64 59 #define USB_DEVICE_MAX USB_MAXBUS * 128 60 static struct class *usb_device_class; 61 62 /* Mutual exclusion for removal, open, and release */ 63 DEFINE_MUTEX(usbfs_mutex); 64 65 struct async { 66 struct list_head asynclist; 67 struct dev_state *ps; 68 struct pid *pid; 69 uid_t uid, euid; 70 unsigned int signr; 71 unsigned int ifnum; 72 void __user *userbuffer; 73 void __user *userurb; 74 struct urb *urb; 75 u32 secid; 76 }; 77 78 static int usbfs_snoop = 0; 79 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR); 80 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic"); 81 82 #define snoop(dev, format, arg...) \ 83 do { \ 84 if (usbfs_snoop) \ 85 dev_info( dev , format , ## arg); \ 86 } while (0) 87 88 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0) 89 90 91 #define MAX_USBFS_BUFFER_SIZE 16384 92 93 static inline int connected (struct dev_state *ps) 94 { 95 return (!list_empty(&ps->list) && 96 ps->dev->state != USB_STATE_NOTATTACHED); 97 } 98 99 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig) 100 { 101 loff_t ret; 102 103 lock_kernel(); 104 105 switch (orig) { 106 case 0: 107 file->f_pos = offset; 108 ret = file->f_pos; 109 break; 110 case 1: 111 file->f_pos += offset; 112 ret = file->f_pos; 113 break; 114 case 2: 115 default: 116 ret = -EINVAL; 117 } 118 119 unlock_kernel(); 120 return ret; 121 } 122 123 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) 124 { 125 struct dev_state *ps = file->private_data; 126 struct usb_device *dev = ps->dev; 127 ssize_t ret = 0; 128 unsigned len; 129 loff_t pos; 130 int i; 131 132 pos = *ppos; 133 usb_lock_device(dev); 134 if (!connected(ps)) { 135 ret = -ENODEV; 136 goto err; 137 } else if (pos < 0) { 138 ret = -EINVAL; 139 goto err; 140 } 141 142 if (pos < sizeof(struct usb_device_descriptor)) { 143 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */ 144 145 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor)); 146 le16_to_cpus(&temp_desc.bcdUSB); 147 le16_to_cpus(&temp_desc.idVendor); 148 le16_to_cpus(&temp_desc.idProduct); 149 le16_to_cpus(&temp_desc.bcdDevice); 150 151 len = sizeof(struct usb_device_descriptor) - pos; 152 if (len > nbytes) 153 len = nbytes; 154 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) { 155 ret = -EFAULT; 156 goto err; 157 } 158 159 *ppos += len; 160 buf += len; 161 nbytes -= len; 162 ret += len; 163 } 164 165 pos = sizeof(struct usb_device_descriptor); 166 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) { 167 struct usb_config_descriptor *config = 168 (struct usb_config_descriptor *)dev->rawdescriptors[i]; 169 unsigned int length = le16_to_cpu(config->wTotalLength); 170 171 if (*ppos < pos + length) { 172 173 /* The descriptor may claim to be longer than it 174 * really is. Here is the actual allocated length. */ 175 unsigned alloclen = 176 le16_to_cpu(dev->config[i].desc.wTotalLength); 177 178 len = length - (*ppos - pos); 179 if (len > nbytes) 180 len = nbytes; 181 182 /* Simply don't write (skip over) unallocated parts */ 183 if (alloclen > (*ppos - pos)) { 184 alloclen -= (*ppos - pos); 185 if (copy_to_user(buf, 186 dev->rawdescriptors[i] + (*ppos - pos), 187 min(len, alloclen))) { 188 ret = -EFAULT; 189 goto err; 190 } 191 } 192 193 *ppos += len; 194 buf += len; 195 nbytes -= len; 196 ret += len; 197 } 198 199 pos += length; 200 } 201 202 err: 203 usb_unlock_device(dev); 204 return ret; 205 } 206 207 /* 208 * async list handling 209 */ 210 211 static struct async *alloc_async(unsigned int numisoframes) 212 { 213 unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor); 214 struct async *as = kzalloc(assize, GFP_KERNEL); 215 216 if (!as) 217 return NULL; 218 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL); 219 if (!as->urb) { 220 kfree(as); 221 return NULL; 222 } 223 return as; 224 } 225 226 static void free_async(struct async *as) 227 { 228 put_pid(as->pid); 229 kfree(as->urb->transfer_buffer); 230 kfree(as->urb->setup_packet); 231 usb_free_urb(as->urb); 232 kfree(as); 233 } 234 235 static inline void async_newpending(struct async *as) 236 { 237 struct dev_state *ps = as->ps; 238 unsigned long flags; 239 240 spin_lock_irqsave(&ps->lock, flags); 241 list_add_tail(&as->asynclist, &ps->async_pending); 242 spin_unlock_irqrestore(&ps->lock, flags); 243 } 244 245 static inline void async_removepending(struct async *as) 246 { 247 struct dev_state *ps = as->ps; 248 unsigned long flags; 249 250 spin_lock_irqsave(&ps->lock, flags); 251 list_del_init(&as->asynclist); 252 spin_unlock_irqrestore(&ps->lock, flags); 253 } 254 255 static inline struct async *async_getcompleted(struct dev_state *ps) 256 { 257 unsigned long flags; 258 struct async *as = NULL; 259 260 spin_lock_irqsave(&ps->lock, flags); 261 if (!list_empty(&ps->async_completed)) { 262 as = list_entry(ps->async_completed.next, struct async, asynclist); 263 list_del_init(&as->asynclist); 264 } 265 spin_unlock_irqrestore(&ps->lock, flags); 266 return as; 267 } 268 269 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb) 270 { 271 unsigned long flags; 272 struct async *as; 273 274 spin_lock_irqsave(&ps->lock, flags); 275 list_for_each_entry(as, &ps->async_pending, asynclist) 276 if (as->userurb == userurb) { 277 list_del_init(&as->asynclist); 278 spin_unlock_irqrestore(&ps->lock, flags); 279 return as; 280 } 281 spin_unlock_irqrestore(&ps->lock, flags); 282 return NULL; 283 } 284 285 static void snoop_urb(struct urb *urb, void __user *userurb) 286 { 287 int j; 288 unsigned char *data = urb->transfer_buffer; 289 290 if (!usbfs_snoop) 291 return; 292 293 if (urb->pipe & USB_DIR_IN) 294 dev_info(&urb->dev->dev, "direction=IN\n"); 295 else 296 dev_info(&urb->dev->dev, "direction=OUT\n"); 297 dev_info(&urb->dev->dev, "userurb=%p\n", userurb); 298 dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n", 299 urb->transfer_buffer_length); 300 dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length); 301 dev_info(&urb->dev->dev, "data: "); 302 for (j = 0; j < urb->transfer_buffer_length; ++j) 303 printk ("%02x ", data[j]); 304 printk("\n"); 305 } 306 307 static void async_completed(struct urb *urb) 308 { 309 struct async *as = urb->context; 310 struct dev_state *ps = as->ps; 311 struct siginfo sinfo; 312 313 spin_lock(&ps->lock); 314 list_move_tail(&as->asynclist, &ps->async_completed); 315 spin_unlock(&ps->lock); 316 if (as->signr) { 317 sinfo.si_signo = as->signr; 318 sinfo.si_errno = as->urb->status; 319 sinfo.si_code = SI_ASYNCIO; 320 sinfo.si_addr = as->userurb; 321 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid, 322 as->euid, as->secid); 323 } 324 snoop(&urb->dev->dev, "urb complete\n"); 325 snoop_urb(urb, as->userurb); 326 wake_up(&ps->wait); 327 } 328 329 static void destroy_async (struct dev_state *ps, struct list_head *list) 330 { 331 struct async *as; 332 unsigned long flags; 333 334 spin_lock_irqsave(&ps->lock, flags); 335 while (!list_empty(list)) { 336 as = list_entry(list->next, struct async, asynclist); 337 list_del_init(&as->asynclist); 338 339 /* drop the spinlock so the completion handler can run */ 340 spin_unlock_irqrestore(&ps->lock, flags); 341 usb_kill_urb(as->urb); 342 spin_lock_irqsave(&ps->lock, flags); 343 } 344 spin_unlock_irqrestore(&ps->lock, flags); 345 as = async_getcompleted(ps); 346 while (as) { 347 free_async(as); 348 as = async_getcompleted(ps); 349 } 350 } 351 352 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum) 353 { 354 struct list_head *p, *q, hitlist; 355 unsigned long flags; 356 357 INIT_LIST_HEAD(&hitlist); 358 spin_lock_irqsave(&ps->lock, flags); 359 list_for_each_safe(p, q, &ps->async_pending) 360 if (ifnum == list_entry(p, struct async, asynclist)->ifnum) 361 list_move_tail(p, &hitlist); 362 spin_unlock_irqrestore(&ps->lock, flags); 363 destroy_async(ps, &hitlist); 364 } 365 366 static inline void destroy_all_async(struct dev_state *ps) 367 { 368 destroy_async(ps, &ps->async_pending); 369 } 370 371 /* 372 * interface claims are made only at the request of user level code, 373 * which can also release them (explicitly or by closing files). 374 * they're also undone when devices disconnect. 375 */ 376 377 static int driver_probe (struct usb_interface *intf, 378 const struct usb_device_id *id) 379 { 380 return -ENODEV; 381 } 382 383 static void driver_disconnect(struct usb_interface *intf) 384 { 385 struct dev_state *ps = usb_get_intfdata (intf); 386 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber; 387 388 if (!ps) 389 return; 390 391 /* NOTE: this relies on usbcore having canceled and completed 392 * all pending I/O requests; 2.6 does that. 393 */ 394 395 if (likely(ifnum < 8*sizeof(ps->ifclaimed))) 396 clear_bit(ifnum, &ps->ifclaimed); 397 else 398 warn("interface number %u out of range", ifnum); 399 400 usb_set_intfdata (intf, NULL); 401 402 /* force async requests to complete */ 403 destroy_async_on_interface(ps, ifnum); 404 } 405 406 struct usb_driver usbfs_driver = { 407 .name = "usbfs", 408 .probe = driver_probe, 409 .disconnect = driver_disconnect, 410 }; 411 412 static int claimintf(struct dev_state *ps, unsigned int ifnum) 413 { 414 struct usb_device *dev = ps->dev; 415 struct usb_interface *intf; 416 int err; 417 418 if (ifnum >= 8*sizeof(ps->ifclaimed)) 419 return -EINVAL; 420 /* already claimed */ 421 if (test_bit(ifnum, &ps->ifclaimed)) 422 return 0; 423 424 /* lock against other changes to driver bindings */ 425 down_write(&usb_bus_type.subsys.rwsem); 426 intf = usb_ifnum_to_if(dev, ifnum); 427 if (!intf) 428 err = -ENOENT; 429 else 430 err = usb_driver_claim_interface(&usbfs_driver, intf, ps); 431 up_write(&usb_bus_type.subsys.rwsem); 432 if (err == 0) 433 set_bit(ifnum, &ps->ifclaimed); 434 return err; 435 } 436 437 static int releaseintf(struct dev_state *ps, unsigned int ifnum) 438 { 439 struct usb_device *dev; 440 struct usb_interface *intf; 441 int err; 442 443 err = -EINVAL; 444 if (ifnum >= 8*sizeof(ps->ifclaimed)) 445 return err; 446 dev = ps->dev; 447 /* lock against other changes to driver bindings */ 448 down_write(&usb_bus_type.subsys.rwsem); 449 intf = usb_ifnum_to_if(dev, ifnum); 450 if (!intf) 451 err = -ENOENT; 452 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) { 453 usb_driver_release_interface(&usbfs_driver, intf); 454 err = 0; 455 } 456 up_write(&usb_bus_type.subsys.rwsem); 457 return err; 458 } 459 460 static int checkintf(struct dev_state *ps, unsigned int ifnum) 461 { 462 if (ps->dev->state != USB_STATE_CONFIGURED) 463 return -EHOSTUNREACH; 464 if (ifnum >= 8*sizeof(ps->ifclaimed)) 465 return -EINVAL; 466 if (test_bit(ifnum, &ps->ifclaimed)) 467 return 0; 468 /* if not yet claimed, claim it for the driver */ 469 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n", 470 current->pid, current->comm, ifnum); 471 return claimintf(ps, ifnum); 472 } 473 474 static int findintfep(struct usb_device *dev, unsigned int ep) 475 { 476 unsigned int i, j, e; 477 struct usb_interface *intf; 478 struct usb_host_interface *alts; 479 struct usb_endpoint_descriptor *endpt; 480 481 if (ep & ~(USB_DIR_IN|0xf)) 482 return -EINVAL; 483 if (!dev->actconfig) 484 return -ESRCH; 485 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { 486 intf = dev->actconfig->interface[i]; 487 for (j = 0; j < intf->num_altsetting; j++) { 488 alts = &intf->altsetting[j]; 489 for (e = 0; e < alts->desc.bNumEndpoints; e++) { 490 endpt = &alts->endpoint[e].desc; 491 if (endpt->bEndpointAddress == ep) 492 return alts->desc.bInterfaceNumber; 493 } 494 } 495 } 496 return -ENOENT; 497 } 498 499 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index) 500 { 501 int ret = 0; 502 503 if (ps->dev->state != USB_STATE_ADDRESS 504 && ps->dev->state != USB_STATE_CONFIGURED) 505 return -EHOSTUNREACH; 506 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype)) 507 return 0; 508 509 index &= 0xff; 510 switch (requesttype & USB_RECIP_MASK) { 511 case USB_RECIP_ENDPOINT: 512 if ((ret = findintfep(ps->dev, index)) >= 0) 513 ret = checkintf(ps, ret); 514 break; 515 516 case USB_RECIP_INTERFACE: 517 ret = checkintf(ps, index); 518 break; 519 } 520 return ret; 521 } 522 523 static struct usb_device *usbdev_lookup_minor(int minor) 524 { 525 struct device *device; 526 struct usb_device *udev = NULL; 527 528 down(&usb_device_class->sem); 529 list_for_each_entry(device, &usb_device_class->devices, node) { 530 if (device->devt == MKDEV(USB_DEVICE_MAJOR, minor)) { 531 udev = device->platform_data; 532 break; 533 } 534 } 535 up(&usb_device_class->sem); 536 537 return udev; 538 }; 539 540 /* 541 * file operations 542 */ 543 static int usbdev_open(struct inode *inode, struct file *file) 544 { 545 struct usb_device *dev = NULL; 546 struct dev_state *ps; 547 int ret; 548 549 /* Protect against simultaneous removal or release */ 550 mutex_lock(&usbfs_mutex); 551 552 ret = -ENOMEM; 553 if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL))) 554 goto out; 555 556 ret = -ENOENT; 557 /* check if we are called from a real node or usbfs */ 558 if (imajor(inode) == USB_DEVICE_MAJOR) 559 dev = usbdev_lookup_minor(iminor(inode)); 560 if (!dev) 561 dev = inode->i_private; 562 if (!dev) 563 goto out; 564 ret = usb_autoresume_device(dev); 565 if (ret) 566 goto out; 567 568 usb_get_dev(dev); 569 ret = 0; 570 ps->dev = dev; 571 ps->file = file; 572 spin_lock_init(&ps->lock); 573 INIT_LIST_HEAD(&ps->list); 574 INIT_LIST_HEAD(&ps->async_pending); 575 INIT_LIST_HEAD(&ps->async_completed); 576 init_waitqueue_head(&ps->wait); 577 ps->discsignr = 0; 578 ps->disc_pid = get_pid(task_pid(current)); 579 ps->disc_uid = current->uid; 580 ps->disc_euid = current->euid; 581 ps->disccontext = NULL; 582 ps->ifclaimed = 0; 583 security_task_getsecid(current, &ps->secid); 584 wmb(); 585 list_add_tail(&ps->list, &dev->filelist); 586 file->private_data = ps; 587 out: 588 if (ret) 589 kfree(ps); 590 mutex_unlock(&usbfs_mutex); 591 return ret; 592 } 593 594 static int usbdev_release(struct inode *inode, struct file *file) 595 { 596 struct dev_state *ps = file->private_data; 597 struct usb_device *dev = ps->dev; 598 unsigned int ifnum; 599 600 usb_lock_device(dev); 601 602 /* Protect against simultaneous open */ 603 mutex_lock(&usbfs_mutex); 604 list_del_init(&ps->list); 605 mutex_unlock(&usbfs_mutex); 606 607 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed); 608 ifnum++) { 609 if (test_bit(ifnum, &ps->ifclaimed)) 610 releaseintf(ps, ifnum); 611 } 612 destroy_all_async(ps); 613 usb_autosuspend_device(dev); 614 usb_unlock_device(dev); 615 usb_put_dev(dev); 616 put_pid(ps->disc_pid); 617 kfree(ps); 618 return 0; 619 } 620 621 static int proc_control(struct dev_state *ps, void __user *arg) 622 { 623 struct usb_device *dev = ps->dev; 624 struct usbdevfs_ctrltransfer ctrl; 625 unsigned int tmo; 626 unsigned char *tbuf; 627 int i, j, ret; 628 629 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 630 return -EFAULT; 631 if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex))) 632 return ret; 633 if (ctrl.wLength > PAGE_SIZE) 634 return -EINVAL; 635 if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL))) 636 return -ENOMEM; 637 tmo = ctrl.timeout; 638 if (ctrl.bRequestType & 0x80) { 639 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) { 640 free_page((unsigned long)tbuf); 641 return -EINVAL; 642 } 643 snoop(&dev->dev, "control read: bRequest=%02x " 644 "bRrequestType=%02x wValue=%04x " 645 "wIndex=%04x wLength=%04x\n", 646 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, 647 ctrl.wIndex, ctrl.wLength); 648 649 usb_unlock_device(dev); 650 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType, 651 ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo); 652 usb_lock_device(dev); 653 if ((i > 0) && ctrl.wLength) { 654 if (usbfs_snoop) { 655 dev_info(&dev->dev, "control read: data "); 656 for (j = 0; j < i; ++j) 657 printk("%02x ", (unsigned char)(tbuf)[j]); 658 printk("\n"); 659 } 660 if (copy_to_user(ctrl.data, tbuf, i)) { 661 free_page((unsigned long)tbuf); 662 return -EFAULT; 663 } 664 } 665 } else { 666 if (ctrl.wLength) { 667 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) { 668 free_page((unsigned long)tbuf); 669 return -EFAULT; 670 } 671 } 672 snoop(&dev->dev, "control write: bRequest=%02x " 673 "bRrequestType=%02x wValue=%04x " 674 "wIndex=%04x wLength=%04x\n", 675 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, 676 ctrl.wIndex, ctrl.wLength); 677 if (usbfs_snoop) { 678 dev_info(&dev->dev, "control write: data: "); 679 for (j = 0; j < ctrl.wLength; ++j) 680 printk("%02x ", (unsigned char)(tbuf)[j]); 681 printk("\n"); 682 } 683 usb_unlock_device(dev); 684 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType, 685 ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo); 686 usb_lock_device(dev); 687 } 688 free_page((unsigned long)tbuf); 689 if (i<0 && i != -EPIPE) { 690 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL " 691 "failed cmd %s rqt %u rq %u len %u ret %d\n", 692 current->comm, ctrl.bRequestType, ctrl.bRequest, 693 ctrl.wLength, i); 694 } 695 return i; 696 } 697 698 static int proc_bulk(struct dev_state *ps, void __user *arg) 699 { 700 struct usb_device *dev = ps->dev; 701 struct usbdevfs_bulktransfer bulk; 702 unsigned int tmo, len1, pipe; 703 int len2; 704 unsigned char *tbuf; 705 int i, j, ret; 706 707 if (copy_from_user(&bulk, arg, sizeof(bulk))) 708 return -EFAULT; 709 if ((ret = findintfep(ps->dev, bulk.ep)) < 0) 710 return ret; 711 if ((ret = checkintf(ps, ret))) 712 return ret; 713 if (bulk.ep & USB_DIR_IN) 714 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f); 715 else 716 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f); 717 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN))) 718 return -EINVAL; 719 len1 = bulk.len; 720 if (len1 > MAX_USBFS_BUFFER_SIZE) 721 return -EINVAL; 722 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) 723 return -ENOMEM; 724 tmo = bulk.timeout; 725 if (bulk.ep & 0x80) { 726 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) { 727 kfree(tbuf); 728 return -EINVAL; 729 } 730 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n", 731 bulk.len, bulk.timeout); 732 usb_unlock_device(dev); 733 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 734 usb_lock_device(dev); 735 if (!i && len2) { 736 if (usbfs_snoop) { 737 dev_info(&dev->dev, "bulk read: data "); 738 for (j = 0; j < len2; ++j) 739 printk("%02x ", (unsigned char)(tbuf)[j]); 740 printk("\n"); 741 } 742 if (copy_to_user(bulk.data, tbuf, len2)) { 743 kfree(tbuf); 744 return -EFAULT; 745 } 746 } 747 } else { 748 if (len1) { 749 if (copy_from_user(tbuf, bulk.data, len1)) { 750 kfree(tbuf); 751 return -EFAULT; 752 } 753 } 754 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n", 755 bulk.len, bulk.timeout); 756 if (usbfs_snoop) { 757 dev_info(&dev->dev, "bulk write: data: "); 758 for (j = 0; j < len1; ++j) 759 printk("%02x ", (unsigned char)(tbuf)[j]); 760 printk("\n"); 761 } 762 usb_unlock_device(dev); 763 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 764 usb_lock_device(dev); 765 } 766 kfree(tbuf); 767 if (i < 0) 768 return i; 769 return len2; 770 } 771 772 static int proc_resetep(struct dev_state *ps, void __user *arg) 773 { 774 unsigned int ep; 775 int ret; 776 777 if (get_user(ep, (unsigned int __user *)arg)) 778 return -EFAULT; 779 if ((ret = findintfep(ps->dev, ep)) < 0) 780 return ret; 781 if ((ret = checkintf(ps, ret))) 782 return ret; 783 usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0); 784 return 0; 785 } 786 787 static int proc_clearhalt(struct dev_state *ps, void __user *arg) 788 { 789 unsigned int ep; 790 int pipe; 791 int ret; 792 793 if (get_user(ep, (unsigned int __user *)arg)) 794 return -EFAULT; 795 if ((ret = findintfep(ps->dev, ep)) < 0) 796 return ret; 797 if ((ret = checkintf(ps, ret))) 798 return ret; 799 if (ep & USB_DIR_IN) 800 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f); 801 else 802 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f); 803 804 return usb_clear_halt(ps->dev, pipe); 805 } 806 807 808 static int proc_getdriver(struct dev_state *ps, void __user *arg) 809 { 810 struct usbdevfs_getdriver gd; 811 struct usb_interface *intf; 812 int ret; 813 814 if (copy_from_user(&gd, arg, sizeof(gd))) 815 return -EFAULT; 816 down_read(&usb_bus_type.subsys.rwsem); 817 intf = usb_ifnum_to_if(ps->dev, gd.interface); 818 if (!intf || !intf->dev.driver) 819 ret = -ENODATA; 820 else { 821 strncpy(gd.driver, intf->dev.driver->name, 822 sizeof(gd.driver)); 823 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0); 824 } 825 up_read(&usb_bus_type.subsys.rwsem); 826 return ret; 827 } 828 829 static int proc_connectinfo(struct dev_state *ps, void __user *arg) 830 { 831 struct usbdevfs_connectinfo ci; 832 833 ci.devnum = ps->dev->devnum; 834 ci.slow = ps->dev->speed == USB_SPEED_LOW; 835 if (copy_to_user(arg, &ci, sizeof(ci))) 836 return -EFAULT; 837 return 0; 838 } 839 840 static int proc_resetdevice(struct dev_state *ps) 841 { 842 return usb_reset_composite_device(ps->dev, NULL); 843 } 844 845 static int proc_setintf(struct dev_state *ps, void __user *arg) 846 { 847 struct usbdevfs_setinterface setintf; 848 int ret; 849 850 if (copy_from_user(&setintf, arg, sizeof(setintf))) 851 return -EFAULT; 852 if ((ret = checkintf(ps, setintf.interface))) 853 return ret; 854 return usb_set_interface(ps->dev, setintf.interface, 855 setintf.altsetting); 856 } 857 858 static int proc_setconfig(struct dev_state *ps, void __user *arg) 859 { 860 unsigned int u; 861 int status = 0; 862 struct usb_host_config *actconfig; 863 864 if (get_user(u, (unsigned int __user *)arg)) 865 return -EFAULT; 866 867 actconfig = ps->dev->actconfig; 868 869 /* Don't touch the device if any interfaces are claimed. 870 * It could interfere with other drivers' operations, and if 871 * an interface is claimed by usbfs it could easily deadlock. 872 */ 873 if (actconfig) { 874 int i; 875 876 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) { 877 if (usb_interface_claimed(actconfig->interface[i])) { 878 dev_warn (&ps->dev->dev, 879 "usbfs: interface %d claimed by %s " 880 "while '%s' sets config #%d\n", 881 actconfig->interface[i] 882 ->cur_altsetting 883 ->desc.bInterfaceNumber, 884 actconfig->interface[i] 885 ->dev.driver->name, 886 current->comm, u); 887 status = -EBUSY; 888 break; 889 } 890 } 891 } 892 893 /* SET_CONFIGURATION is often abused as a "cheap" driver reset, 894 * so avoid usb_set_configuration()'s kick to sysfs 895 */ 896 if (status == 0) { 897 if (actconfig && actconfig->desc.bConfigurationValue == u) 898 status = usb_reset_configuration(ps->dev); 899 else 900 status = usb_set_configuration(ps->dev, u); 901 } 902 903 return status; 904 } 905 906 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb, 907 struct usbdevfs_iso_packet_desc __user *iso_frame_desc, 908 void __user *arg) 909 { 910 struct usbdevfs_iso_packet_desc *isopkt = NULL; 911 struct usb_host_endpoint *ep; 912 struct async *as; 913 struct usb_ctrlrequest *dr = NULL; 914 unsigned int u, totlen, isofrmlen; 915 int ret, interval = 0, ifnum = -1; 916 917 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK| 918 URB_NO_FSBR|URB_ZERO_PACKET)) 919 return -EINVAL; 920 if (!uurb->buffer) 921 return -EINVAL; 922 if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX)) 923 return -EINVAL; 924 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) { 925 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0) 926 return ifnum; 927 if ((ret = checkintf(ps, ifnum))) 928 return ret; 929 } 930 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) 931 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 932 else 933 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 934 if (!ep) 935 return -ENOENT; 936 switch(uurb->type) { 937 case USBDEVFS_URB_TYPE_CONTROL: 938 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) 939 != USB_ENDPOINT_XFER_CONTROL) 940 return -EINVAL; 941 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */ 942 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE)) 943 return -EINVAL; 944 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL))) 945 return -ENOMEM; 946 if (copy_from_user(dr, uurb->buffer, 8)) { 947 kfree(dr); 948 return -EFAULT; 949 } 950 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) { 951 kfree(dr); 952 return -EINVAL; 953 } 954 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) { 955 kfree(dr); 956 return ret; 957 } 958 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK); 959 uurb->number_of_packets = 0; 960 uurb->buffer_length = le16_to_cpup(&dr->wLength); 961 uurb->buffer += 8; 962 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) { 963 kfree(dr); 964 return -EFAULT; 965 } 966 snoop(&ps->dev->dev, "control urb: bRequest=%02x " 967 "bRrequestType=%02x wValue=%04x " 968 "wIndex=%04x wLength=%04x\n", 969 dr->bRequest, dr->bRequestType, dr->wValue, 970 dr->wIndex, dr->wLength); 971 break; 972 973 case USBDEVFS_URB_TYPE_BULK: 974 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { 975 case USB_ENDPOINT_XFER_CONTROL: 976 case USB_ENDPOINT_XFER_ISOC: 977 return -EINVAL; 978 /* allow single-shot interrupt transfers, at bogus rates */ 979 } 980 uurb->number_of_packets = 0; 981 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE) 982 return -EINVAL; 983 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) 984 return -EFAULT; 985 snoop(&ps->dev->dev, "bulk urb\n"); 986 break; 987 988 case USBDEVFS_URB_TYPE_ISO: 989 /* arbitrary limit */ 990 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128) 991 return -EINVAL; 992 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) 993 != USB_ENDPOINT_XFER_ISOC) 994 return -EINVAL; 995 interval = 1 << min (15, ep->desc.bInterval - 1); 996 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets; 997 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL))) 998 return -ENOMEM; 999 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) { 1000 kfree(isopkt); 1001 return -EFAULT; 1002 } 1003 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1004 /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */ 1005 if (isopkt[u].length > 8192) { 1006 kfree(isopkt); 1007 return -EINVAL; 1008 } 1009 totlen += isopkt[u].length; 1010 } 1011 if (totlen > 32768) { 1012 kfree(isopkt); 1013 return -EINVAL; 1014 } 1015 uurb->buffer_length = totlen; 1016 snoop(&ps->dev->dev, "iso urb\n"); 1017 break; 1018 1019 case USBDEVFS_URB_TYPE_INTERRUPT: 1020 uurb->number_of_packets = 0; 1021 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) 1022 != USB_ENDPOINT_XFER_INT) 1023 return -EINVAL; 1024 if (ps->dev->speed == USB_SPEED_HIGH) 1025 interval = 1 << min (15, ep->desc.bInterval - 1); 1026 else 1027 interval = ep->desc.bInterval; 1028 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE) 1029 return -EINVAL; 1030 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) 1031 return -EFAULT; 1032 snoop(&ps->dev->dev, "interrupt urb\n"); 1033 break; 1034 1035 default: 1036 return -EINVAL; 1037 } 1038 if (!(as = alloc_async(uurb->number_of_packets))) { 1039 kfree(isopkt); 1040 kfree(dr); 1041 return -ENOMEM; 1042 } 1043 if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) { 1044 kfree(isopkt); 1045 kfree(dr); 1046 free_async(as); 1047 return -ENOMEM; 1048 } 1049 as->urb->dev = ps->dev; 1050 as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN); 1051 as->urb->transfer_flags = uurb->flags; 1052 as->urb->transfer_buffer_length = uurb->buffer_length; 1053 as->urb->setup_packet = (unsigned char*)dr; 1054 as->urb->start_frame = uurb->start_frame; 1055 as->urb->number_of_packets = uurb->number_of_packets; 1056 as->urb->interval = interval; 1057 as->urb->context = as; 1058 as->urb->complete = async_completed; 1059 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1060 as->urb->iso_frame_desc[u].offset = totlen; 1061 as->urb->iso_frame_desc[u].length = isopkt[u].length; 1062 totlen += isopkt[u].length; 1063 } 1064 kfree(isopkt); 1065 as->ps = ps; 1066 as->userurb = arg; 1067 if (uurb->endpoint & USB_DIR_IN) 1068 as->userbuffer = uurb->buffer; 1069 else 1070 as->userbuffer = NULL; 1071 as->signr = uurb->signr; 1072 as->ifnum = ifnum; 1073 as->pid = get_pid(task_pid(current)); 1074 as->uid = current->uid; 1075 as->euid = current->euid; 1076 security_task_getsecid(current, &as->secid); 1077 if (!(uurb->endpoint & USB_DIR_IN)) { 1078 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) { 1079 free_async(as); 1080 return -EFAULT; 1081 } 1082 } 1083 snoop(&as->urb->dev->dev, "submit urb\n"); 1084 snoop_urb(as->urb, as->userurb); 1085 async_newpending(as); 1086 if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) { 1087 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret); 1088 async_removepending(as); 1089 free_async(as); 1090 return ret; 1091 } 1092 return 0; 1093 } 1094 1095 static int proc_submiturb(struct dev_state *ps, void __user *arg) 1096 { 1097 struct usbdevfs_urb uurb; 1098 1099 if (copy_from_user(&uurb, arg, sizeof(uurb))) 1100 return -EFAULT; 1101 1102 return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg); 1103 } 1104 1105 static int proc_unlinkurb(struct dev_state *ps, void __user *arg) 1106 { 1107 struct async *as; 1108 1109 as = async_getpending(ps, arg); 1110 if (!as) 1111 return -EINVAL; 1112 usb_kill_urb(as->urb); 1113 return 0; 1114 } 1115 1116 static int processcompl(struct async *as, void __user * __user *arg) 1117 { 1118 struct urb *urb = as->urb; 1119 struct usbdevfs_urb __user *userurb = as->userurb; 1120 void __user *addr = as->userurb; 1121 unsigned int i; 1122 1123 if (as->userbuffer) 1124 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length)) 1125 return -EFAULT; 1126 if (put_user(urb->status, &userurb->status)) 1127 return -EFAULT; 1128 if (put_user(urb->actual_length, &userurb->actual_length)) 1129 return -EFAULT; 1130 if (put_user(urb->error_count, &userurb->error_count)) 1131 return -EFAULT; 1132 1133 if (usb_pipeisoc(urb->pipe)) { 1134 for (i = 0; i < urb->number_of_packets; i++) { 1135 if (put_user(urb->iso_frame_desc[i].actual_length, 1136 &userurb->iso_frame_desc[i].actual_length)) 1137 return -EFAULT; 1138 if (put_user(urb->iso_frame_desc[i].status, 1139 &userurb->iso_frame_desc[i].status)) 1140 return -EFAULT; 1141 } 1142 } 1143 1144 free_async(as); 1145 1146 if (put_user(addr, (void __user * __user *)arg)) 1147 return -EFAULT; 1148 return 0; 1149 } 1150 1151 static struct async* reap_as(struct dev_state *ps) 1152 { 1153 DECLARE_WAITQUEUE(wait, current); 1154 struct async *as = NULL; 1155 struct usb_device *dev = ps->dev; 1156 1157 add_wait_queue(&ps->wait, &wait); 1158 for (;;) { 1159 __set_current_state(TASK_INTERRUPTIBLE); 1160 if ((as = async_getcompleted(ps))) 1161 break; 1162 if (signal_pending(current)) 1163 break; 1164 usb_unlock_device(dev); 1165 schedule(); 1166 usb_lock_device(dev); 1167 } 1168 remove_wait_queue(&ps->wait, &wait); 1169 set_current_state(TASK_RUNNING); 1170 return as; 1171 } 1172 1173 static int proc_reapurb(struct dev_state *ps, void __user *arg) 1174 { 1175 struct async *as = reap_as(ps); 1176 if (as) 1177 return processcompl(as, (void __user * __user *)arg); 1178 if (signal_pending(current)) 1179 return -EINTR; 1180 return -EIO; 1181 } 1182 1183 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg) 1184 { 1185 struct async *as; 1186 1187 if (!(as = async_getcompleted(ps))) 1188 return -EAGAIN; 1189 return processcompl(as, (void __user * __user *)arg); 1190 } 1191 1192 #ifdef CONFIG_COMPAT 1193 1194 static int get_urb32(struct usbdevfs_urb *kurb, 1195 struct usbdevfs_urb32 __user *uurb) 1196 { 1197 __u32 uptr; 1198 if (get_user(kurb->type, &uurb->type) || 1199 __get_user(kurb->endpoint, &uurb->endpoint) || 1200 __get_user(kurb->status, &uurb->status) || 1201 __get_user(kurb->flags, &uurb->flags) || 1202 __get_user(kurb->buffer_length, &uurb->buffer_length) || 1203 __get_user(kurb->actual_length, &uurb->actual_length) || 1204 __get_user(kurb->start_frame, &uurb->start_frame) || 1205 __get_user(kurb->number_of_packets, &uurb->number_of_packets) || 1206 __get_user(kurb->error_count, &uurb->error_count) || 1207 __get_user(kurb->signr, &uurb->signr)) 1208 return -EFAULT; 1209 1210 if (__get_user(uptr, &uurb->buffer)) 1211 return -EFAULT; 1212 kurb->buffer = compat_ptr(uptr); 1213 if (__get_user(uptr, &uurb->buffer)) 1214 return -EFAULT; 1215 kurb->usercontext = compat_ptr(uptr); 1216 1217 return 0; 1218 } 1219 1220 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg) 1221 { 1222 struct usbdevfs_urb uurb; 1223 1224 if (get_urb32(&uurb,(struct usbdevfs_urb32 __user *)arg)) 1225 return -EFAULT; 1226 1227 return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg); 1228 } 1229 1230 static int processcompl_compat(struct async *as, void __user * __user *arg) 1231 { 1232 struct urb *urb = as->urb; 1233 struct usbdevfs_urb32 __user *userurb = as->userurb; 1234 void __user *addr = as->userurb; 1235 unsigned int i; 1236 1237 if (as->userbuffer) 1238 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length)) 1239 return -EFAULT; 1240 if (put_user(urb->status, &userurb->status)) 1241 return -EFAULT; 1242 if (put_user(urb->actual_length, &userurb->actual_length)) 1243 return -EFAULT; 1244 if (put_user(urb->error_count, &userurb->error_count)) 1245 return -EFAULT; 1246 1247 if (usb_pipeisoc(urb->pipe)) { 1248 for (i = 0; i < urb->number_of_packets; i++) { 1249 if (put_user(urb->iso_frame_desc[i].actual_length, 1250 &userurb->iso_frame_desc[i].actual_length)) 1251 return -EFAULT; 1252 if (put_user(urb->iso_frame_desc[i].status, 1253 &userurb->iso_frame_desc[i].status)) 1254 return -EFAULT; 1255 } 1256 } 1257 1258 free_async(as); 1259 if (put_user(ptr_to_compat(addr), (u32 __user *)arg)) 1260 return -EFAULT; 1261 return 0; 1262 } 1263 1264 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg) 1265 { 1266 struct async *as = reap_as(ps); 1267 if (as) 1268 return processcompl_compat(as, (void __user * __user *)arg); 1269 if (signal_pending(current)) 1270 return -EINTR; 1271 return -EIO; 1272 } 1273 1274 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg) 1275 { 1276 struct async *as; 1277 1278 if (!(as = async_getcompleted(ps))) 1279 return -EAGAIN; 1280 return processcompl_compat(as, (void __user * __user *)arg); 1281 } 1282 1283 #endif 1284 1285 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg) 1286 { 1287 struct usbdevfs_disconnectsignal ds; 1288 1289 if (copy_from_user(&ds, arg, sizeof(ds))) 1290 return -EFAULT; 1291 if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX)) 1292 return -EINVAL; 1293 ps->discsignr = ds.signr; 1294 ps->disccontext = ds.context; 1295 return 0; 1296 } 1297 1298 static int proc_claiminterface(struct dev_state *ps, void __user *arg) 1299 { 1300 unsigned int ifnum; 1301 1302 if (get_user(ifnum, (unsigned int __user *)arg)) 1303 return -EFAULT; 1304 return claimintf(ps, ifnum); 1305 } 1306 1307 static int proc_releaseinterface(struct dev_state *ps, void __user *arg) 1308 { 1309 unsigned int ifnum; 1310 int ret; 1311 1312 if (get_user(ifnum, (unsigned int __user *)arg)) 1313 return -EFAULT; 1314 if ((ret = releaseintf(ps, ifnum)) < 0) 1315 return ret; 1316 destroy_async_on_interface (ps, ifnum); 1317 return 0; 1318 } 1319 1320 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl) 1321 { 1322 int size; 1323 void *buf = NULL; 1324 int retval = 0; 1325 struct usb_interface *intf = NULL; 1326 struct usb_driver *driver = NULL; 1327 1328 /* alloc buffer */ 1329 if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) { 1330 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL) 1331 return -ENOMEM; 1332 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) { 1333 if (copy_from_user (buf, ctl->data, size)) { 1334 kfree(buf); 1335 return -EFAULT; 1336 } 1337 } else { 1338 memset (buf, 0, size); 1339 } 1340 } 1341 1342 if (!connected(ps)) { 1343 kfree(buf); 1344 return -ENODEV; 1345 } 1346 1347 if (ps->dev->state != USB_STATE_CONFIGURED) 1348 retval = -EHOSTUNREACH; 1349 else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno))) 1350 retval = -EINVAL; 1351 else switch (ctl->ioctl_code) { 1352 1353 /* disconnect kernel driver from interface */ 1354 case USBDEVFS_DISCONNECT: 1355 1356 down_write(&usb_bus_type.subsys.rwsem); 1357 if (intf->dev.driver) { 1358 driver = to_usb_driver(intf->dev.driver); 1359 dev_dbg (&intf->dev, "disconnect by usbfs\n"); 1360 usb_driver_release_interface(driver, intf); 1361 } else 1362 retval = -ENODATA; 1363 up_write(&usb_bus_type.subsys.rwsem); 1364 break; 1365 1366 /* let kernel drivers try to (re)bind to the interface */ 1367 case USBDEVFS_CONNECT: 1368 usb_unlock_device(ps->dev); 1369 retval = bus_rescan_devices(intf->dev.bus); 1370 usb_lock_device(ps->dev); 1371 break; 1372 1373 /* talk directly to the interface's driver */ 1374 default: 1375 down_read(&usb_bus_type.subsys.rwsem); 1376 if (intf->dev.driver) 1377 driver = to_usb_driver(intf->dev.driver); 1378 if (driver == NULL || driver->ioctl == NULL) { 1379 retval = -ENOTTY; 1380 } else { 1381 retval = driver->ioctl (intf, ctl->ioctl_code, buf); 1382 if (retval == -ENOIOCTLCMD) 1383 retval = -ENOTTY; 1384 } 1385 up_read(&usb_bus_type.subsys.rwsem); 1386 } 1387 1388 /* cleanup and return */ 1389 if (retval >= 0 1390 && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0 1391 && size > 0 1392 && copy_to_user (ctl->data, buf, size) != 0) 1393 retval = -EFAULT; 1394 1395 kfree(buf); 1396 return retval; 1397 } 1398 1399 static int proc_ioctl_default(struct dev_state *ps, void __user *arg) 1400 { 1401 struct usbdevfs_ioctl ctrl; 1402 1403 if (copy_from_user(&ctrl, arg, sizeof (ctrl))) 1404 return -EFAULT; 1405 return proc_ioctl(ps, &ctrl); 1406 } 1407 1408 #ifdef CONFIG_COMPAT 1409 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg) 1410 { 1411 struct usbdevfs_ioctl32 __user *uioc; 1412 struct usbdevfs_ioctl ctrl; 1413 u32 udata; 1414 1415 uioc = compat_ptr((long)arg); 1416 if (get_user(ctrl.ifno, &uioc->ifno) || 1417 get_user(ctrl.ioctl_code, &uioc->ioctl_code) || 1418 __get_user(udata, &uioc->data)) 1419 return -EFAULT; 1420 ctrl.data = compat_ptr(udata); 1421 1422 return proc_ioctl(ps, &ctrl); 1423 } 1424 #endif 1425 1426 /* 1427 * NOTE: All requests here that have interface numbers as parameters 1428 * are assuming that somehow the configuration has been prevented from 1429 * changing. But there's no mechanism to ensure that... 1430 */ 1431 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) 1432 { 1433 struct dev_state *ps = file->private_data; 1434 struct usb_device *dev = ps->dev; 1435 void __user *p = (void __user *)arg; 1436 int ret = -ENOTTY; 1437 1438 if (!(file->f_mode & FMODE_WRITE)) 1439 return -EPERM; 1440 usb_lock_device(dev); 1441 if (!connected(ps)) { 1442 usb_unlock_device(dev); 1443 return -ENODEV; 1444 } 1445 1446 switch (cmd) { 1447 case USBDEVFS_CONTROL: 1448 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__); 1449 ret = proc_control(ps, p); 1450 if (ret >= 0) 1451 inode->i_mtime = CURRENT_TIME; 1452 break; 1453 1454 case USBDEVFS_BULK: 1455 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__); 1456 ret = proc_bulk(ps, p); 1457 if (ret >= 0) 1458 inode->i_mtime = CURRENT_TIME; 1459 break; 1460 1461 case USBDEVFS_RESETEP: 1462 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__); 1463 ret = proc_resetep(ps, p); 1464 if (ret >= 0) 1465 inode->i_mtime = CURRENT_TIME; 1466 break; 1467 1468 case USBDEVFS_RESET: 1469 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__); 1470 ret = proc_resetdevice(ps); 1471 break; 1472 1473 case USBDEVFS_CLEAR_HALT: 1474 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__); 1475 ret = proc_clearhalt(ps, p); 1476 if (ret >= 0) 1477 inode->i_mtime = CURRENT_TIME; 1478 break; 1479 1480 case USBDEVFS_GETDRIVER: 1481 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__); 1482 ret = proc_getdriver(ps, p); 1483 break; 1484 1485 case USBDEVFS_CONNECTINFO: 1486 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__); 1487 ret = proc_connectinfo(ps, p); 1488 break; 1489 1490 case USBDEVFS_SETINTERFACE: 1491 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__); 1492 ret = proc_setintf(ps, p); 1493 break; 1494 1495 case USBDEVFS_SETCONFIGURATION: 1496 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__); 1497 ret = proc_setconfig(ps, p); 1498 break; 1499 1500 case USBDEVFS_SUBMITURB: 1501 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__); 1502 ret = proc_submiturb(ps, p); 1503 if (ret >= 0) 1504 inode->i_mtime = CURRENT_TIME; 1505 break; 1506 1507 #ifdef CONFIG_COMPAT 1508 1509 case USBDEVFS_SUBMITURB32: 1510 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__); 1511 ret = proc_submiturb_compat(ps, p); 1512 if (ret >= 0) 1513 inode->i_mtime = CURRENT_TIME; 1514 break; 1515 1516 case USBDEVFS_REAPURB32: 1517 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__); 1518 ret = proc_reapurb_compat(ps, p); 1519 break; 1520 1521 case USBDEVFS_REAPURBNDELAY32: 1522 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__); 1523 ret = proc_reapurbnonblock_compat(ps, p); 1524 break; 1525 1526 case USBDEVFS_IOCTL32: 1527 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__); 1528 ret = proc_ioctl_compat(ps, ptr_to_compat(p)); 1529 break; 1530 #endif 1531 1532 case USBDEVFS_DISCARDURB: 1533 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__); 1534 ret = proc_unlinkurb(ps, p); 1535 break; 1536 1537 case USBDEVFS_REAPURB: 1538 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__); 1539 ret = proc_reapurb(ps, p); 1540 break; 1541 1542 case USBDEVFS_REAPURBNDELAY: 1543 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__); 1544 ret = proc_reapurbnonblock(ps, p); 1545 break; 1546 1547 case USBDEVFS_DISCSIGNAL: 1548 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__); 1549 ret = proc_disconnectsignal(ps, p); 1550 break; 1551 1552 case USBDEVFS_CLAIMINTERFACE: 1553 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__); 1554 ret = proc_claiminterface(ps, p); 1555 break; 1556 1557 case USBDEVFS_RELEASEINTERFACE: 1558 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__); 1559 ret = proc_releaseinterface(ps, p); 1560 break; 1561 1562 case USBDEVFS_IOCTL: 1563 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__); 1564 ret = proc_ioctl_default(ps, p); 1565 break; 1566 } 1567 usb_unlock_device(dev); 1568 if (ret >= 0) 1569 inode->i_atime = CURRENT_TIME; 1570 return ret; 1571 } 1572 1573 /* No kernel lock - fine */ 1574 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait) 1575 { 1576 struct dev_state *ps = file->private_data; 1577 unsigned int mask = 0; 1578 1579 poll_wait(file, &ps->wait, wait); 1580 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed)) 1581 mask |= POLLOUT | POLLWRNORM; 1582 if (!connected(ps)) 1583 mask |= POLLERR | POLLHUP; 1584 return mask; 1585 } 1586 1587 const struct file_operations usbfs_device_file_operations = { 1588 .llseek = usbdev_lseek, 1589 .read = usbdev_read, 1590 .poll = usbdev_poll, 1591 .ioctl = usbdev_ioctl, 1592 .open = usbdev_open, 1593 .release = usbdev_release, 1594 }; 1595 1596 static int usbdev_add(struct usb_device *dev) 1597 { 1598 int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1); 1599 1600 dev->usbfs_dev = device_create(usb_device_class, &dev->dev, 1601 MKDEV(USB_DEVICE_MAJOR, minor), 1602 "usbdev%d.%d", dev->bus->busnum, dev->devnum); 1603 if (IS_ERR(dev->usbfs_dev)) 1604 return PTR_ERR(dev->usbfs_dev); 1605 1606 dev->usbfs_dev->platform_data = dev; 1607 return 0; 1608 } 1609 1610 static void usbdev_remove(struct usb_device *dev) 1611 { 1612 device_unregister(dev->usbfs_dev); 1613 } 1614 1615 static int usbdev_notify(struct notifier_block *self, unsigned long action, 1616 void *dev) 1617 { 1618 switch (action) { 1619 case USB_DEVICE_ADD: 1620 if (usbdev_add(dev)) 1621 return NOTIFY_BAD; 1622 break; 1623 case USB_DEVICE_REMOVE: 1624 usbdev_remove(dev); 1625 break; 1626 } 1627 return NOTIFY_OK; 1628 } 1629 1630 static struct notifier_block usbdev_nb = { 1631 .notifier_call = usbdev_notify, 1632 }; 1633 1634 static struct cdev usb_device_cdev = { 1635 .kobj = {.name = "usb_device", }, 1636 .owner = THIS_MODULE, 1637 }; 1638 1639 int __init usbdev_init(void) 1640 { 1641 int retval; 1642 1643 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX, 1644 "usb_device"); 1645 if (retval) { 1646 err("unable to register minors for usb_device"); 1647 goto out; 1648 } 1649 cdev_init(&usb_device_cdev, &usbfs_device_file_operations); 1650 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX); 1651 if (retval) { 1652 err("unable to get usb_device major %d", USB_DEVICE_MAJOR); 1653 goto error_cdev; 1654 } 1655 usb_device_class = class_create(THIS_MODULE, "usb_device"); 1656 if (IS_ERR(usb_device_class)) { 1657 err("unable to register usb_device class"); 1658 retval = PTR_ERR(usb_device_class); 1659 goto error_class; 1660 } 1661 1662 usb_register_notify(&usbdev_nb); 1663 1664 out: 1665 return retval; 1666 1667 error_class: 1668 usb_device_class = NULL; 1669 cdev_del(&usb_device_cdev); 1670 1671 error_cdev: 1672 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 1673 goto out; 1674 } 1675 1676 void usbdev_cleanup(void) 1677 { 1678 usb_unregister_notify(&usbdev_nb); 1679 class_destroy(usb_device_class); 1680 cdev_del(&usb_device_cdev); 1681 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 1682 } 1683 1684