1 /* 2 * devices.c 3 * (C) Copyright 1999 Randy Dunlap. 4 * (C) Copyright 1999,2000 Thomas Sailer <sailer@ife.ee.ethz.ch>. (proc file per device) 5 * (C) Copyright 1999 Deti Fliegl (new USB architecture) 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 * 21 ************************************************************* 22 * 23 * <mountpoint>/devices contains USB topology, device, config, class, 24 * interface, & endpoint data. 25 * 26 * I considered using /proc/bus/usb/devices/device# for each device 27 * as it is attached or detached, but I didn't like this for some 28 * reason -- maybe it's just too deep of a directory structure. 29 * I also don't like looking in multiple places to gather and view 30 * the data. Having only one file for ./devices also prevents race 31 * conditions that could arise if a program was reading device info 32 * for devices that are being removed (unplugged). (That is, the 33 * program may find a directory for devnum_12 then try to open it, 34 * but it was just unplugged, so the directory is now deleted. 35 * But programs would just have to be prepared for situations like 36 * this in any plug-and-play environment.) 37 * 38 * 1999-12-16: Thomas Sailer <sailer@ife.ee.ethz.ch> 39 * Converted the whole proc stuff to real 40 * read methods. Now not the whole device list needs to fit 41 * into one page, only the device list for one bus. 42 * Added a poll method to /proc/bus/usb/devices, to wake 43 * up an eventual usbd 44 * 2000-01-04: Thomas Sailer <sailer@ife.ee.ethz.ch> 45 * Turned into its own filesystem 46 * 2000-07-05: Ashley Montanaro <ashley@compsoc.man.ac.uk> 47 * Converted file reading routine to dump to buffer once 48 * per device, not per bus 49 */ 50 51 #include <linux/fs.h> 52 #include <linux/mm.h> 53 #include <linux/slab.h> 54 #include <linux/poll.h> 55 #include <linux/usb.h> 56 #include <linux/smp_lock.h> 57 #include <linux/usbdevice_fs.h> 58 #include <linux/mutex.h> 59 #include <asm/uaccess.h> 60 61 #include "usb.h" 62 #include "hcd.h" 63 64 /* Define ALLOW_SERIAL_NUMBER if you want to see the serial number of devices */ 65 #define ALLOW_SERIAL_NUMBER 66 67 static const char *format_topo = 68 /* T: Bus=dd Lev=dd Prnt=dd Port=dd Cnt=dd Dev#=ddd Spd=ddd MxCh=dd */ 69 "\nT: Bus=%2.2d Lev=%2.2d Prnt=%2.2d Port=%2.2d Cnt=%2.2d Dev#=%3d Spd=%3s MxCh=%2d\n"; 70 71 static const char *format_string_manufacturer = 72 /* S: Manufacturer=xxxx */ 73 "S: Manufacturer=%.100s\n"; 74 75 static const char *format_string_product = 76 /* S: Product=xxxx */ 77 "S: Product=%.100s\n"; 78 79 #ifdef ALLOW_SERIAL_NUMBER 80 static const char *format_string_serialnumber = 81 /* S: SerialNumber=xxxx */ 82 "S: SerialNumber=%.100s\n"; 83 #endif 84 85 static const char *format_bandwidth = 86 /* B: Alloc=ddd/ddd us (xx%), #Int=ddd, #Iso=ddd */ 87 "B: Alloc=%3d/%3d us (%2d%%), #Int=%3d, #Iso=%3d\n"; 88 89 static const char *format_device1 = 90 /* D: Ver=xx.xx Cls=xx(sssss) Sub=xx Prot=xx MxPS=dd #Cfgs=dd */ 91 "D: Ver=%2x.%02x Cls=%02x(%-5s) Sub=%02x Prot=%02x MxPS=%2d #Cfgs=%3d\n"; 92 93 static const char *format_device2 = 94 /* P: Vendor=xxxx ProdID=xxxx Rev=xx.xx */ 95 "P: Vendor=%04x ProdID=%04x Rev=%2x.%02x\n"; 96 97 static const char *format_config = 98 /* C: #Ifs=dd Cfg#=dd Atr=xx MPwr=dddmA */ 99 "C:%c #Ifs=%2d Cfg#=%2d Atr=%02x MxPwr=%3dmA\n"; 100 101 static const char *format_iad = 102 /* A: FirstIf#=dd IfCount=dd Cls=xx(sssss) Sub=xx Prot=xx */ 103 "A: FirstIf#=%2d IfCount=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x\n"; 104 105 static const char *format_iface = 106 /* I: If#=dd Alt=dd #EPs=dd Cls=xx(sssss) Sub=xx Prot=xx Driver=xxxx*/ 107 "I:%c If#=%2d Alt=%2d #EPs=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x Driver=%s\n"; 108 109 static const char *format_endpt = 110 /* E: Ad=xx(s) Atr=xx(ssss) MxPS=dddd Ivl=D?s */ 111 "E: Ad=%02x(%c) Atr=%02x(%-4s) MxPS=%4d Ivl=%d%cs\n"; 112 113 114 /* 115 * Need access to the driver and USB bus lists. 116 * extern struct list_head usb_bus_list; 117 * However, these will come from functions that return ptrs to each of them. 118 */ 119 120 static DECLARE_WAIT_QUEUE_HEAD(deviceconndiscwq); 121 /* guarded by usbfs_mutex */ 122 static unsigned int conndiscevcnt; 123 124 /* this struct stores the poll state for <mountpoint>/devices pollers */ 125 struct usb_device_status { 126 unsigned int lastev; 127 }; 128 129 struct class_info { 130 int class; 131 char *class_name; 132 }; 133 134 static const struct class_info clas_info[] = 135 { /* max. 5 chars. per name string */ 136 {USB_CLASS_PER_INTERFACE, ">ifc"}, 137 {USB_CLASS_AUDIO, "audio"}, 138 {USB_CLASS_COMM, "comm."}, 139 {USB_CLASS_HID, "HID"}, 140 {USB_CLASS_PHYSICAL, "PID"}, 141 {USB_CLASS_STILL_IMAGE, "still"}, 142 {USB_CLASS_PRINTER, "print"}, 143 {USB_CLASS_MASS_STORAGE, "stor."}, 144 {USB_CLASS_HUB, "hub"}, 145 {USB_CLASS_CDC_DATA, "data"}, 146 {USB_CLASS_CSCID, "scard"}, 147 {USB_CLASS_CONTENT_SEC, "c-sec"}, 148 {USB_CLASS_VIDEO, "video"}, 149 {USB_CLASS_WIRELESS_CONTROLLER, "wlcon"}, 150 {USB_CLASS_MISC, "misc"}, 151 {USB_CLASS_APP_SPEC, "app."}, 152 {USB_CLASS_VENDOR_SPEC, "vend."}, 153 {-1, "unk."} /* leave as last */ 154 }; 155 156 /*****************************************************************/ 157 158 void usbfs_conn_disc_event(void) 159 { 160 mutex_lock(&usbfs_mutex); 161 conndiscevcnt++; 162 mutex_unlock(&usbfs_mutex); 163 wake_up(&deviceconndiscwq); 164 } 165 166 static const char *class_decode(const int class) 167 { 168 int ix; 169 170 for (ix = 0; clas_info[ix].class != -1; ix++) 171 if (clas_info[ix].class == class) 172 break; 173 return clas_info[ix].class_name; 174 } 175 176 static char *usb_dump_endpoint_descriptor(int speed, char *start, char *end, 177 const struct usb_endpoint_descriptor *desc) 178 { 179 char dir, unit, *type; 180 unsigned interval, bandwidth = 1; 181 182 if (start > end) 183 return start; 184 185 dir = usb_endpoint_dir_in(desc) ? 'I' : 'O'; 186 187 if (speed == USB_SPEED_HIGH) { 188 switch (le16_to_cpu(desc->wMaxPacketSize) & (0x03 << 11)) { 189 case 1 << 11: bandwidth = 2; break; 190 case 2 << 11: bandwidth = 3; break; 191 } 192 } 193 194 /* this isn't checking for illegal values */ 195 switch (usb_endpoint_type(desc)) { 196 case USB_ENDPOINT_XFER_CONTROL: 197 type = "Ctrl"; 198 if (speed == USB_SPEED_HIGH) /* uframes per NAK */ 199 interval = desc->bInterval; 200 else 201 interval = 0; 202 dir = 'B'; /* ctrl is bidirectional */ 203 break; 204 case USB_ENDPOINT_XFER_ISOC: 205 type = "Isoc"; 206 interval = 1 << (desc->bInterval - 1); 207 break; 208 case USB_ENDPOINT_XFER_BULK: 209 type = "Bulk"; 210 if (speed == USB_SPEED_HIGH && dir == 'O') /* uframes per NAK */ 211 interval = desc->bInterval; 212 else 213 interval = 0; 214 break; 215 case USB_ENDPOINT_XFER_INT: 216 type = "Int."; 217 if (speed == USB_SPEED_HIGH) 218 interval = 1 << (desc->bInterval - 1); 219 else 220 interval = desc->bInterval; 221 break; 222 default: /* "can't happen" */ 223 return start; 224 } 225 interval *= (speed == USB_SPEED_HIGH) ? 125 : 1000; 226 if (interval % 1000) 227 unit = 'u'; 228 else { 229 unit = 'm'; 230 interval /= 1000; 231 } 232 233 start += sprintf(start, format_endpt, desc->bEndpointAddress, dir, 234 desc->bmAttributes, type, 235 (le16_to_cpu(desc->wMaxPacketSize) & 0x07ff) * 236 bandwidth, 237 interval, unit); 238 return start; 239 } 240 241 static char *usb_dump_interface_descriptor(char *start, char *end, 242 const struct usb_interface_cache *intfc, 243 const struct usb_interface *iface, 244 int setno) 245 { 246 const struct usb_interface_descriptor *desc; 247 const char *driver_name = ""; 248 int active = 0; 249 250 if (start > end) 251 return start; 252 desc = &intfc->altsetting[setno].desc; 253 if (iface) { 254 driver_name = (iface->dev.driver 255 ? iface->dev.driver->name 256 : "(none)"); 257 active = (desc == &iface->cur_altsetting->desc); 258 } 259 start += sprintf(start, format_iface, 260 active ? '*' : ' ', /* mark active altsetting */ 261 desc->bInterfaceNumber, 262 desc->bAlternateSetting, 263 desc->bNumEndpoints, 264 desc->bInterfaceClass, 265 class_decode(desc->bInterfaceClass), 266 desc->bInterfaceSubClass, 267 desc->bInterfaceProtocol, 268 driver_name); 269 return start; 270 } 271 272 static char *usb_dump_interface(int speed, char *start, char *end, 273 const struct usb_interface_cache *intfc, 274 const struct usb_interface *iface, int setno) 275 { 276 const struct usb_host_interface *desc = &intfc->altsetting[setno]; 277 int i; 278 279 start = usb_dump_interface_descriptor(start, end, intfc, iface, setno); 280 for (i = 0; i < desc->desc.bNumEndpoints; i++) { 281 if (start > end) 282 return start; 283 start = usb_dump_endpoint_descriptor(speed, 284 start, end, &desc->endpoint[i].desc); 285 } 286 return start; 287 } 288 289 static char *usb_dump_iad_descriptor(char *start, char *end, 290 const struct usb_interface_assoc_descriptor *iad) 291 { 292 if (start > end) 293 return start; 294 start += sprintf(start, format_iad, 295 iad->bFirstInterface, 296 iad->bInterfaceCount, 297 iad->bFunctionClass, 298 class_decode(iad->bFunctionClass), 299 iad->bFunctionSubClass, 300 iad->bFunctionProtocol); 301 return start; 302 } 303 304 /* TBD: 305 * 0. TBDs 306 * 1. marking active interface altsettings (code lists all, but should mark 307 * which ones are active, if any) 308 */ 309 static char *usb_dump_config_descriptor(char *start, char *end, 310 const struct usb_config_descriptor *desc, 311 int active) 312 { 313 if (start > end) 314 return start; 315 start += sprintf(start, format_config, 316 /* mark active/actual/current cfg. */ 317 active ? '*' : ' ', 318 desc->bNumInterfaces, 319 desc->bConfigurationValue, 320 desc->bmAttributes, 321 desc->bMaxPower * 2); 322 return start; 323 } 324 325 static char *usb_dump_config(int speed, char *start, char *end, 326 const struct usb_host_config *config, int active) 327 { 328 int i, j; 329 struct usb_interface_cache *intfc; 330 struct usb_interface *interface; 331 332 if (start > end) 333 return start; 334 if (!config) 335 /* getting these some in 2.3.7; none in 2.3.6 */ 336 return start + sprintf(start, "(null Cfg. desc.)\n"); 337 start = usb_dump_config_descriptor(start, end, &config->desc, active); 338 for (i = 0; i < USB_MAXIADS; i++) { 339 if (config->intf_assoc[i] == NULL) 340 break; 341 start = usb_dump_iad_descriptor(start, end, 342 config->intf_assoc[i]); 343 } 344 for (i = 0; i < config->desc.bNumInterfaces; i++) { 345 intfc = config->intf_cache[i]; 346 interface = config->interface[i]; 347 for (j = 0; j < intfc->num_altsetting; j++) { 348 if (start > end) 349 return start; 350 start = usb_dump_interface(speed, 351 start, end, intfc, interface, j); 352 } 353 } 354 return start; 355 } 356 357 /* 358 * Dump the different USB descriptors. 359 */ 360 static char *usb_dump_device_descriptor(char *start, char *end, 361 const struct usb_device_descriptor *desc) 362 { 363 u16 bcdUSB = le16_to_cpu(desc->bcdUSB); 364 u16 bcdDevice = le16_to_cpu(desc->bcdDevice); 365 366 if (start > end) 367 return start; 368 start += sprintf(start, format_device1, 369 bcdUSB >> 8, bcdUSB & 0xff, 370 desc->bDeviceClass, 371 class_decode(desc->bDeviceClass), 372 desc->bDeviceSubClass, 373 desc->bDeviceProtocol, 374 desc->bMaxPacketSize0, 375 desc->bNumConfigurations); 376 if (start > end) 377 return start; 378 start += sprintf(start, format_device2, 379 le16_to_cpu(desc->idVendor), 380 le16_to_cpu(desc->idProduct), 381 bcdDevice >> 8, bcdDevice & 0xff); 382 return start; 383 } 384 385 /* 386 * Dump the different strings that this device holds. 387 */ 388 static char *usb_dump_device_strings(char *start, char *end, 389 struct usb_device *dev) 390 { 391 if (start > end) 392 return start; 393 if (dev->manufacturer) 394 start += sprintf(start, format_string_manufacturer, 395 dev->manufacturer); 396 if (start > end) 397 goto out; 398 if (dev->product) 399 start += sprintf(start, format_string_product, dev->product); 400 if (start > end) 401 goto out; 402 #ifdef ALLOW_SERIAL_NUMBER 403 if (dev->serial) 404 start += sprintf(start, format_string_serialnumber, 405 dev->serial); 406 #endif 407 out: 408 return start; 409 } 410 411 static char *usb_dump_desc(char *start, char *end, struct usb_device *dev) 412 { 413 int i; 414 415 if (start > end) 416 return start; 417 418 start = usb_dump_device_descriptor(start, end, &dev->descriptor); 419 420 if (start > end) 421 return start; 422 423 start = usb_dump_device_strings(start, end, dev); 424 425 for (i = 0; i < dev->descriptor.bNumConfigurations; i++) { 426 if (start > end) 427 return start; 428 start = usb_dump_config(dev->speed, 429 start, end, dev->config + i, 430 /* active ? */ 431 (dev->config + i) == dev->actconfig); 432 } 433 return start; 434 } 435 436 437 #ifdef PROC_EXTRA /* TBD: may want to add this code later */ 438 439 static char *usb_dump_hub_descriptor(char *start, char *end, 440 const struct usb_hub_descriptor *desc) 441 { 442 int leng = USB_DT_HUB_NONVAR_SIZE; 443 unsigned char *ptr = (unsigned char *)desc; 444 445 if (start > end) 446 return start; 447 start += sprintf(start, "Interface:"); 448 while (leng && start <= end) { 449 start += sprintf(start, " %02x", *ptr); 450 ptr++; leng--; 451 } 452 *start++ = '\n'; 453 return start; 454 } 455 456 static char *usb_dump_string(char *start, char *end, 457 const struct usb_device *dev, char *id, int index) 458 { 459 if (start > end) 460 return start; 461 start += sprintf(start, "Interface:"); 462 if (index <= dev->maxstring && dev->stringindex && 463 dev->stringindex[index]) 464 start += sprintf(start, "%s: %.100s ", id, 465 dev->stringindex[index]); 466 return start; 467 } 468 469 #endif /* PROC_EXTRA */ 470 471 /*****************************************************************/ 472 473 /* This is a recursive function. Parameters: 474 * buffer - the user-space buffer to write data into 475 * nbytes - the maximum number of bytes to write 476 * skip_bytes - the number of bytes to skip before writing anything 477 * file_offset - the offset into the devices file on completion 478 * The caller must own the device lock. 479 */ 480 static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes, 481 loff_t *skip_bytes, loff_t *file_offset, 482 struct usb_device *usbdev, struct usb_bus *bus, 483 int level, int index, int count) 484 { 485 int chix; 486 int ret, cnt = 0; 487 int parent_devnum = 0; 488 char *pages_start, *data_end, *speed; 489 unsigned int length; 490 ssize_t total_written = 0; 491 492 /* don't bother with anything else if we're not writing any data */ 493 if (*nbytes <= 0) 494 return 0; 495 496 if (level > MAX_TOPO_LEVEL) 497 return 0; 498 /* allocate 2^1 pages = 8K (on i386); 499 * should be more than enough for one device */ 500 pages_start = (char *)__get_free_pages(GFP_NOIO, 1); 501 if (!pages_start) 502 return -ENOMEM; 503 504 if (usbdev->parent && usbdev->parent->devnum != -1) 505 parent_devnum = usbdev->parent->devnum; 506 /* 507 * So the root hub's parent is 0 and any device that is 508 * plugged into the root hub has a parent of 0. 509 */ 510 switch (usbdev->speed) { 511 case USB_SPEED_LOW: 512 speed = "1.5"; break; 513 case USB_SPEED_UNKNOWN: /* usb 1.1 root hub code */ 514 case USB_SPEED_FULL: 515 speed = "12 "; break; 516 case USB_SPEED_HIGH: 517 speed = "480"; break; 518 default: 519 speed = "?? "; 520 } 521 data_end = pages_start + sprintf(pages_start, format_topo, 522 bus->busnum, level, parent_devnum, 523 index, count, usbdev->devnum, 524 speed, usbdev->maxchild); 525 /* 526 * level = topology-tier level; 527 * parent_devnum = parent device number; 528 * index = parent's connector number; 529 * count = device count at this level 530 */ 531 /* If this is the root hub, display the bandwidth information */ 532 if (level == 0) { 533 int max; 534 535 /* high speed reserves 80%, full/low reserves 90% */ 536 if (usbdev->speed == USB_SPEED_HIGH) 537 max = 800; 538 else 539 max = FRAME_TIME_MAX_USECS_ALLOC; 540 541 /* report "average" periodic allocation over a microsecond. 542 * the schedules are actually bursty, HCDs need to deal with 543 * that and just compute/report this average. 544 */ 545 data_end += sprintf(data_end, format_bandwidth, 546 bus->bandwidth_allocated, max, 547 (100 * bus->bandwidth_allocated + max / 2) 548 / max, 549 bus->bandwidth_int_reqs, 550 bus->bandwidth_isoc_reqs); 551 552 } 553 data_end = usb_dump_desc(data_end, pages_start + (2 * PAGE_SIZE) - 256, 554 usbdev); 555 556 if (data_end > (pages_start + (2 * PAGE_SIZE) - 256)) 557 data_end += sprintf(data_end, "(truncated)\n"); 558 559 length = data_end - pages_start; 560 /* if we can start copying some data to the user */ 561 if (length > *skip_bytes) { 562 length -= *skip_bytes; 563 if (length > *nbytes) 564 length = *nbytes; 565 if (copy_to_user(*buffer, pages_start + *skip_bytes, length)) { 566 free_pages((unsigned long)pages_start, 1); 567 return -EFAULT; 568 } 569 *nbytes -= length; 570 *file_offset += length; 571 total_written += length; 572 *buffer += length; 573 *skip_bytes = 0; 574 } else 575 *skip_bytes -= length; 576 577 free_pages((unsigned long)pages_start, 1); 578 579 /* Now look at all of this device's children. */ 580 for (chix = 0; chix < usbdev->maxchild; chix++) { 581 struct usb_device *childdev = usbdev->children[chix]; 582 583 if (childdev) { 584 usb_lock_device(childdev); 585 ret = usb_device_dump(buffer, nbytes, skip_bytes, 586 file_offset, childdev, bus, 587 level + 1, chix, ++cnt); 588 usb_unlock_device(childdev); 589 if (ret == -EFAULT) 590 return total_written; 591 total_written += ret; 592 } 593 } 594 return total_written; 595 } 596 597 static ssize_t usb_device_read(struct file *file, char __user *buf, 598 size_t nbytes, loff_t *ppos) 599 { 600 struct usb_bus *bus; 601 ssize_t ret, total_written = 0; 602 loff_t skip_bytes = *ppos; 603 604 if (*ppos < 0) 605 return -EINVAL; 606 if (nbytes <= 0) 607 return 0; 608 if (!access_ok(VERIFY_WRITE, buf, nbytes)) 609 return -EFAULT; 610 611 mutex_lock(&usb_bus_list_lock); 612 /* print devices for all busses */ 613 list_for_each_entry(bus, &usb_bus_list, bus_list) { 614 /* recurse through all children of the root hub */ 615 if (!bus->root_hub) 616 continue; 617 usb_lock_device(bus->root_hub); 618 ret = usb_device_dump(&buf, &nbytes, &skip_bytes, ppos, 619 bus->root_hub, bus, 0, 0, 0); 620 usb_unlock_device(bus->root_hub); 621 if (ret < 0) { 622 mutex_unlock(&usb_bus_list_lock); 623 return ret; 624 } 625 total_written += ret; 626 } 627 mutex_unlock(&usb_bus_list_lock); 628 return total_written; 629 } 630 631 /* Kernel lock for "lastev" protection */ 632 static unsigned int usb_device_poll(struct file *file, 633 struct poll_table_struct *wait) 634 { 635 struct usb_device_status *st; 636 unsigned int mask = 0; 637 638 mutex_lock(&usbfs_mutex); 639 st = file->private_data; 640 if (!st) { 641 st = kmalloc(sizeof(struct usb_device_status), GFP_KERNEL); 642 if (!st) { 643 mutex_unlock(&usbfs_mutex); 644 return POLLIN; 645 } 646 647 st->lastev = conndiscevcnt; 648 file->private_data = st; 649 mask = POLLIN; 650 } 651 652 if (file->f_mode & FMODE_READ) 653 poll_wait(file, &deviceconndiscwq, wait); 654 if (st->lastev != conndiscevcnt) 655 mask |= POLLIN; 656 st->lastev = conndiscevcnt; 657 mutex_unlock(&usbfs_mutex); 658 return mask; 659 } 660 661 static int usb_device_open(struct inode *inode, struct file *file) 662 { 663 file->private_data = NULL; 664 return 0; 665 } 666 667 static int usb_device_release(struct inode *inode, struct file *file) 668 { 669 kfree(file->private_data); 670 file->private_data = NULL; 671 return 0; 672 } 673 674 static loff_t usb_device_lseek(struct file *file, loff_t offset, int orig) 675 { 676 loff_t ret; 677 678 lock_kernel(); 679 680 switch (orig) { 681 case 0: 682 file->f_pos = offset; 683 ret = file->f_pos; 684 break; 685 case 1: 686 file->f_pos += offset; 687 ret = file->f_pos; 688 break; 689 case 2: 690 default: 691 ret = -EINVAL; 692 } 693 694 unlock_kernel(); 695 return ret; 696 } 697 698 const struct file_operations usbfs_devices_fops = { 699 .llseek = usb_device_lseek, 700 .read = usb_device_read, 701 .poll = usb_device_poll, 702 .open = usb_device_open, 703 .release = usb_device_release, 704 }; 705