1 /* 2 * drivers/usb/core/sysfs.c 3 * 4 * (C) Copyright 2002 David Brownell 5 * (C) Copyright 2002,2004 Greg Kroah-Hartman 6 * (C) Copyright 2002,2004 IBM Corp. 7 * 8 * All of the sysfs file attributes for usb devices and interfaces. 9 * 10 */ 11 12 13 #include <linux/kernel.h> 14 #include <linux/string.h> 15 #include <linux/usb.h> 16 #include "usb.h" 17 18 /* Active configuration fields */ 19 #define usb_actconfig_show(field, multiplier, format_string) \ 20 static ssize_t show_##field(struct device *dev, \ 21 struct device_attribute *attr, char *buf) \ 22 { \ 23 struct usb_device *udev; \ 24 struct usb_host_config *actconfig; \ 25 \ 26 udev = to_usb_device(dev); \ 27 actconfig = udev->actconfig; \ 28 if (actconfig) \ 29 return sprintf(buf, format_string, \ 30 actconfig->desc.field * multiplier); \ 31 else \ 32 return 0; \ 33 } \ 34 35 #define usb_actconfig_attr(field, multiplier, format_string) \ 36 usb_actconfig_show(field, multiplier, format_string) \ 37 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 38 39 usb_actconfig_attr(bNumInterfaces, 1, "%2d\n") 40 usb_actconfig_attr(bmAttributes, 1, "%2x\n") 41 usb_actconfig_attr(bMaxPower, 2, "%3dmA\n") 42 43 static ssize_t show_configuration_string(struct device *dev, 44 struct device_attribute *attr, char *buf) 45 { 46 struct usb_device *udev; 47 struct usb_host_config *actconfig; 48 49 udev = to_usb_device(dev); 50 actconfig = udev->actconfig; 51 if ((!actconfig) || (!actconfig->string)) 52 return 0; 53 return sprintf(buf, "%s\n", actconfig->string); 54 } 55 static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL); 56 57 /* configuration value is always present, and r/w */ 58 usb_actconfig_show(bConfigurationValue, 1, "%u\n"); 59 60 static ssize_t 61 set_bConfigurationValue(struct device *dev, struct device_attribute *attr, 62 const char *buf, size_t count) 63 { 64 struct usb_device *udev = to_usb_device(dev); 65 int config, value; 66 67 if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255) 68 return -EINVAL; 69 usb_lock_device(udev); 70 value = usb_set_configuration(udev, config); 71 usb_unlock_device(udev); 72 return (value < 0) ? value : count; 73 } 74 75 static DEVICE_ATTR(bConfigurationValue, S_IRUGO | S_IWUSR, 76 show_bConfigurationValue, set_bConfigurationValue); 77 78 /* String fields */ 79 #define usb_string_attr(name) \ 80 static ssize_t show_##name(struct device *dev, \ 81 struct device_attribute *attr, char *buf) \ 82 { \ 83 struct usb_device *udev; \ 84 \ 85 udev = to_usb_device(dev); \ 86 return sprintf(buf, "%s\n", udev->name); \ 87 } \ 88 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); 89 90 usb_string_attr(product); 91 usb_string_attr(manufacturer); 92 usb_string_attr(serial); 93 94 static ssize_t 95 show_speed(struct device *dev, struct device_attribute *attr, char *buf) 96 { 97 struct usb_device *udev; 98 char *speed; 99 100 udev = to_usb_device(dev); 101 102 switch (udev->speed) { 103 case USB_SPEED_LOW: 104 speed = "1.5"; 105 break; 106 case USB_SPEED_UNKNOWN: 107 case USB_SPEED_FULL: 108 speed = "12"; 109 break; 110 case USB_SPEED_HIGH: 111 speed = "480"; 112 break; 113 default: 114 speed = "unknown"; 115 } 116 return sprintf(buf, "%s\n", speed); 117 } 118 static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL); 119 120 static ssize_t 121 show_busnum(struct device *dev, struct device_attribute *attr, char *buf) 122 { 123 struct usb_device *udev; 124 125 udev = to_usb_device(dev); 126 return sprintf(buf, "%d\n", udev->bus->busnum); 127 } 128 static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL); 129 130 static ssize_t 131 show_devnum(struct device *dev, struct device_attribute *attr, char *buf) 132 { 133 struct usb_device *udev; 134 135 udev = to_usb_device(dev); 136 return sprintf(buf, "%d\n", udev->devnum); 137 } 138 static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL); 139 140 static ssize_t 141 show_version(struct device *dev, struct device_attribute *attr, char *buf) 142 { 143 struct usb_device *udev; 144 u16 bcdUSB; 145 146 udev = to_usb_device(dev); 147 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB); 148 return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff); 149 } 150 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); 151 152 static ssize_t 153 show_maxchild(struct device *dev, struct device_attribute *attr, char *buf) 154 { 155 struct usb_device *udev; 156 157 udev = to_usb_device(dev); 158 return sprintf(buf, "%d\n", udev->maxchild); 159 } 160 static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL); 161 162 static ssize_t 163 show_quirks(struct device *dev, struct device_attribute *attr, char *buf) 164 { 165 struct usb_device *udev; 166 167 udev = to_usb_device(dev); 168 return sprintf(buf, "0x%x\n", udev->quirks); 169 } 170 static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL); 171 172 static ssize_t 173 show_urbnum(struct device *dev, struct device_attribute *attr, char *buf) 174 { 175 struct usb_device *udev; 176 177 udev = to_usb_device(dev); 178 return sprintf(buf, "%d\n", atomic_read(&udev->urbnum)); 179 } 180 static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL); 181 182 183 #if defined(CONFIG_USB_PERSIST) || defined(CONFIG_USB_SUSPEND) 184 static const char power_group[] = "power"; 185 #endif 186 187 #ifdef CONFIG_USB_PERSIST 188 189 static ssize_t 190 show_persist(struct device *dev, struct device_attribute *attr, char *buf) 191 { 192 struct usb_device *udev = to_usb_device(dev); 193 194 return sprintf(buf, "%d\n", udev->persist_enabled); 195 } 196 197 static ssize_t 198 set_persist(struct device *dev, struct device_attribute *attr, 199 const char *buf, size_t count) 200 { 201 struct usb_device *udev = to_usb_device(dev); 202 int value; 203 204 /* Hubs are always enabled for USB_PERSIST */ 205 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) 206 return -EPERM; 207 208 if (sscanf(buf, "%d", &value) != 1) 209 return -EINVAL; 210 usb_pm_lock(udev); 211 udev->persist_enabled = !!value; 212 usb_pm_unlock(udev); 213 return count; 214 } 215 216 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist); 217 218 static int add_persist_attributes(struct device *dev) 219 { 220 int rc = 0; 221 222 if (is_usb_device(dev)) { 223 struct usb_device *udev = to_usb_device(dev); 224 225 /* Hubs are automatically enabled for USB_PERSIST */ 226 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) 227 udev->persist_enabled = 1; 228 rc = sysfs_add_file_to_group(&dev->kobj, 229 &dev_attr_persist.attr, 230 power_group); 231 } 232 return rc; 233 } 234 235 static void remove_persist_attributes(struct device *dev) 236 { 237 sysfs_remove_file_from_group(&dev->kobj, 238 &dev_attr_persist.attr, 239 power_group); 240 } 241 242 #else 243 244 #define add_persist_attributes(dev) 0 245 #define remove_persist_attributes(dev) do {} while (0) 246 247 #endif /* CONFIG_USB_PERSIST */ 248 249 #ifdef CONFIG_USB_SUSPEND 250 251 static ssize_t 252 show_connected_duration(struct device *dev, struct device_attribute *attr, 253 char *buf) 254 { 255 struct usb_device *udev = to_usb_device(dev); 256 257 return sprintf(buf, "%u\n", 258 jiffies_to_msecs(jiffies - udev->connect_time)); 259 } 260 261 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL); 262 263 /* 264 * If the device is resumed, the last time the device was suspended has 265 * been pre-subtracted from active_duration. We add the current time to 266 * get the duration that the device was actually active. 267 * 268 * If the device is suspended, the active_duration is up-to-date. 269 */ 270 static ssize_t 271 show_active_duration(struct device *dev, struct device_attribute *attr, 272 char *buf) 273 { 274 struct usb_device *udev = to_usb_device(dev); 275 int duration; 276 277 if (udev->state != USB_STATE_SUSPENDED) 278 duration = jiffies_to_msecs(jiffies + udev->active_duration); 279 else 280 duration = jiffies_to_msecs(udev->active_duration); 281 return sprintf(buf, "%u\n", duration); 282 } 283 284 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL); 285 286 static ssize_t 287 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf) 288 { 289 struct usb_device *udev = to_usb_device(dev); 290 291 return sprintf(buf, "%d\n", udev->autosuspend_delay / HZ); 292 } 293 294 static ssize_t 295 set_autosuspend(struct device *dev, struct device_attribute *attr, 296 const char *buf, size_t count) 297 { 298 struct usb_device *udev = to_usb_device(dev); 299 int value; 300 301 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/HZ || 302 value <= - INT_MAX/HZ) 303 return -EINVAL; 304 value *= HZ; 305 306 udev->autosuspend_delay = value; 307 if (value >= 0) 308 usb_try_autosuspend_device(udev); 309 else { 310 if (usb_autoresume_device(udev) == 0) 311 usb_autosuspend_device(udev); 312 } 313 return count; 314 } 315 316 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR, 317 show_autosuspend, set_autosuspend); 318 319 static const char on_string[] = "on"; 320 static const char auto_string[] = "auto"; 321 static const char suspend_string[] = "suspend"; 322 323 static ssize_t 324 show_level(struct device *dev, struct device_attribute *attr, char *buf) 325 { 326 struct usb_device *udev = to_usb_device(dev); 327 const char *p = auto_string; 328 329 if (udev->state == USB_STATE_SUSPENDED) { 330 if (udev->autoresume_disabled) 331 p = suspend_string; 332 } else { 333 if (udev->autosuspend_disabled) 334 p = on_string; 335 } 336 return sprintf(buf, "%s\n", p); 337 } 338 339 static ssize_t 340 set_level(struct device *dev, struct device_attribute *attr, 341 const char *buf, size_t count) 342 { 343 struct usb_device *udev = to_usb_device(dev); 344 int len = count; 345 char *cp; 346 int rc = 0; 347 int old_autosuspend_disabled, old_autoresume_disabled; 348 349 cp = memchr(buf, '\n', count); 350 if (cp) 351 len = cp - buf; 352 353 usb_lock_device(udev); 354 old_autosuspend_disabled = udev->autosuspend_disabled; 355 old_autoresume_disabled = udev->autoresume_disabled; 356 357 /* Setting the flags without calling usb_pm_lock is a subject to 358 * races, but who cares... 359 */ 360 if (len == sizeof on_string - 1 && 361 strncmp(buf, on_string, len) == 0) { 362 udev->autosuspend_disabled = 1; 363 udev->autoresume_disabled = 0; 364 rc = usb_external_resume_device(udev); 365 366 } else if (len == sizeof auto_string - 1 && 367 strncmp(buf, auto_string, len) == 0) { 368 udev->autosuspend_disabled = 0; 369 udev->autoresume_disabled = 0; 370 rc = usb_external_resume_device(udev); 371 372 } else if (len == sizeof suspend_string - 1 && 373 strncmp(buf, suspend_string, len) == 0) { 374 udev->autosuspend_disabled = 0; 375 udev->autoresume_disabled = 1; 376 rc = usb_external_suspend_device(udev, PMSG_SUSPEND); 377 378 } else 379 rc = -EINVAL; 380 381 if (rc) { 382 udev->autosuspend_disabled = old_autosuspend_disabled; 383 udev->autoresume_disabled = old_autoresume_disabled; 384 } 385 usb_unlock_device(udev); 386 return (rc < 0 ? rc : count); 387 } 388 389 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level); 390 391 static int add_power_attributes(struct device *dev) 392 { 393 int rc = 0; 394 395 if (is_usb_device(dev)) { 396 rc = sysfs_add_file_to_group(&dev->kobj, 397 &dev_attr_autosuspend.attr, 398 power_group); 399 if (rc == 0) 400 rc = sysfs_add_file_to_group(&dev->kobj, 401 &dev_attr_level.attr, 402 power_group); 403 if (rc == 0) 404 rc = sysfs_add_file_to_group(&dev->kobj, 405 &dev_attr_connected_duration.attr, 406 power_group); 407 if (rc == 0) 408 rc = sysfs_add_file_to_group(&dev->kobj, 409 &dev_attr_active_duration.attr, 410 power_group); 411 } 412 return rc; 413 } 414 415 static void remove_power_attributes(struct device *dev) 416 { 417 sysfs_remove_file_from_group(&dev->kobj, 418 &dev_attr_active_duration.attr, 419 power_group); 420 sysfs_remove_file_from_group(&dev->kobj, 421 &dev_attr_connected_duration.attr, 422 power_group); 423 sysfs_remove_file_from_group(&dev->kobj, 424 &dev_attr_level.attr, 425 power_group); 426 sysfs_remove_file_from_group(&dev->kobj, 427 &dev_attr_autosuspend.attr, 428 power_group); 429 } 430 431 #else 432 433 #define add_power_attributes(dev) 0 434 #define remove_power_attributes(dev) do {} while (0) 435 436 #endif /* CONFIG_USB_SUSPEND */ 437 438 439 /* Descriptor fields */ 440 #define usb_descriptor_attr_le16(field, format_string) \ 441 static ssize_t \ 442 show_##field(struct device *dev, struct device_attribute *attr, \ 443 char *buf) \ 444 { \ 445 struct usb_device *udev; \ 446 \ 447 udev = to_usb_device(dev); \ 448 return sprintf(buf, format_string, \ 449 le16_to_cpu(udev->descriptor.field)); \ 450 } \ 451 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 452 453 usb_descriptor_attr_le16(idVendor, "%04x\n") 454 usb_descriptor_attr_le16(idProduct, "%04x\n") 455 usb_descriptor_attr_le16(bcdDevice, "%04x\n") 456 457 #define usb_descriptor_attr(field, format_string) \ 458 static ssize_t \ 459 show_##field(struct device *dev, struct device_attribute *attr, \ 460 char *buf) \ 461 { \ 462 struct usb_device *udev; \ 463 \ 464 udev = to_usb_device(dev); \ 465 return sprintf(buf, format_string, udev->descriptor.field); \ 466 } \ 467 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 468 469 usb_descriptor_attr(bDeviceClass, "%02x\n") 470 usb_descriptor_attr(bDeviceSubClass, "%02x\n") 471 usb_descriptor_attr(bDeviceProtocol, "%02x\n") 472 usb_descriptor_attr(bNumConfigurations, "%d\n") 473 usb_descriptor_attr(bMaxPacketSize0, "%d\n") 474 475 476 477 /* show if the device is authorized (1) or not (0) */ 478 static ssize_t usb_dev_authorized_show(struct device *dev, 479 struct device_attribute *attr, 480 char *buf) 481 { 482 struct usb_device *usb_dev = to_usb_device(dev); 483 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized); 484 } 485 486 487 /* 488 * Authorize a device to be used in the system 489 * 490 * Writing a 0 deauthorizes the device, writing a 1 authorizes it. 491 */ 492 static ssize_t usb_dev_authorized_store(struct device *dev, 493 struct device_attribute *attr, 494 const char *buf, size_t size) 495 { 496 ssize_t result; 497 struct usb_device *usb_dev = to_usb_device(dev); 498 unsigned val; 499 result = sscanf(buf, "%u\n", &val); 500 if (result != 1) 501 result = -EINVAL; 502 else if (val == 0) 503 result = usb_deauthorize_device(usb_dev); 504 else 505 result = usb_authorize_device(usb_dev); 506 return result < 0? result : size; 507 } 508 509 static DEVICE_ATTR(authorized, 0644, 510 usb_dev_authorized_show, usb_dev_authorized_store); 511 512 513 static struct attribute *dev_attrs[] = { 514 /* current configuration's attributes */ 515 &dev_attr_configuration.attr, 516 &dev_attr_bNumInterfaces.attr, 517 &dev_attr_bConfigurationValue.attr, 518 &dev_attr_bmAttributes.attr, 519 &dev_attr_bMaxPower.attr, 520 &dev_attr_urbnum.attr, 521 /* device attributes */ 522 &dev_attr_idVendor.attr, 523 &dev_attr_idProduct.attr, 524 &dev_attr_bcdDevice.attr, 525 &dev_attr_bDeviceClass.attr, 526 &dev_attr_bDeviceSubClass.attr, 527 &dev_attr_bDeviceProtocol.attr, 528 &dev_attr_bNumConfigurations.attr, 529 &dev_attr_bMaxPacketSize0.attr, 530 &dev_attr_speed.attr, 531 &dev_attr_busnum.attr, 532 &dev_attr_devnum.attr, 533 &dev_attr_version.attr, 534 &dev_attr_maxchild.attr, 535 &dev_attr_quirks.attr, 536 &dev_attr_authorized.attr, 537 NULL, 538 }; 539 static struct attribute_group dev_attr_grp = { 540 .attrs = dev_attrs, 541 }; 542 543 /* Binary descriptors */ 544 545 static ssize_t 546 read_descriptors(struct kobject *kobj, struct bin_attribute *attr, 547 char *buf, loff_t off, size_t count) 548 { 549 struct usb_device *udev = to_usb_device( 550 container_of(kobj, struct device, kobj)); 551 size_t nleft = count; 552 size_t srclen, n; 553 554 usb_lock_device(udev); 555 556 /* The binary attribute begins with the device descriptor */ 557 srclen = sizeof(struct usb_device_descriptor); 558 if (off < srclen) { 559 n = min_t(size_t, nleft, srclen - off); 560 memcpy(buf, off + (char *) &udev->descriptor, n); 561 nleft -= n; 562 buf += n; 563 off = 0; 564 } else { 565 off -= srclen; 566 } 567 568 /* Then follows the raw descriptor entry for the current 569 * configuration (config plus subsidiary descriptors). 570 */ 571 if (udev->actconfig) { 572 int cfgno = udev->actconfig - udev->config; 573 574 srclen = __le16_to_cpu(udev->actconfig->desc.wTotalLength); 575 if (off < srclen) { 576 n = min_t(size_t, nleft, srclen - off); 577 memcpy(buf, off + udev->rawdescriptors[cfgno], n); 578 nleft -= n; 579 } 580 } 581 usb_unlock_device(udev); 582 return count - nleft; 583 } 584 585 static struct bin_attribute dev_bin_attr_descriptors = { 586 .attr = {.name = "descriptors", .mode = 0444}, 587 .read = read_descriptors, 588 .size = 18 + 65535, /* dev descr + max-size raw descriptor */ 589 }; 590 591 int usb_create_sysfs_dev_files(struct usb_device *udev) 592 { 593 struct device *dev = &udev->dev; 594 int retval; 595 596 retval = sysfs_create_group(&dev->kobj, &dev_attr_grp); 597 if (retval) 598 return retval; 599 600 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors); 601 if (retval) 602 goto error; 603 604 retval = add_persist_attributes(dev); 605 if (retval) 606 goto error; 607 608 retval = add_power_attributes(dev); 609 if (retval) 610 goto error; 611 612 if (udev->manufacturer) { 613 retval = device_create_file(dev, &dev_attr_manufacturer); 614 if (retval) 615 goto error; 616 } 617 if (udev->product) { 618 retval = device_create_file(dev, &dev_attr_product); 619 if (retval) 620 goto error; 621 } 622 if (udev->serial) { 623 retval = device_create_file(dev, &dev_attr_serial); 624 if (retval) 625 goto error; 626 } 627 retval = usb_create_ep_files(dev, &udev->ep0, udev); 628 if (retval) 629 goto error; 630 return 0; 631 error: 632 usb_remove_sysfs_dev_files(udev); 633 return retval; 634 } 635 636 void usb_remove_sysfs_dev_files(struct usb_device *udev) 637 { 638 struct device *dev = &udev->dev; 639 640 usb_remove_ep_files(&udev->ep0); 641 device_remove_file(dev, &dev_attr_manufacturer); 642 device_remove_file(dev, &dev_attr_product); 643 device_remove_file(dev, &dev_attr_serial); 644 remove_power_attributes(dev); 645 remove_persist_attributes(dev); 646 device_remove_bin_file(dev, &dev_bin_attr_descriptors); 647 sysfs_remove_group(&dev->kobj, &dev_attr_grp); 648 } 649 650 /* Interface Accociation Descriptor fields */ 651 #define usb_intf_assoc_attr(field, format_string) \ 652 static ssize_t \ 653 show_iad_##field(struct device *dev, struct device_attribute *attr, \ 654 char *buf) \ 655 { \ 656 struct usb_interface *intf = to_usb_interface(dev); \ 657 \ 658 return sprintf(buf, format_string, \ 659 intf->intf_assoc->field); \ 660 } \ 661 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL); 662 663 usb_intf_assoc_attr(bFirstInterface, "%02x\n") 664 usb_intf_assoc_attr(bInterfaceCount, "%02d\n") 665 usb_intf_assoc_attr(bFunctionClass, "%02x\n") 666 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n") 667 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n") 668 669 /* Interface fields */ 670 #define usb_intf_attr(field, format_string) \ 671 static ssize_t \ 672 show_##field(struct device *dev, struct device_attribute *attr, \ 673 char *buf) \ 674 { \ 675 struct usb_interface *intf = to_usb_interface(dev); \ 676 \ 677 return sprintf(buf, format_string, \ 678 intf->cur_altsetting->desc.field); \ 679 } \ 680 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 681 682 usb_intf_attr(bInterfaceNumber, "%02x\n") 683 usb_intf_attr(bAlternateSetting, "%2d\n") 684 usb_intf_attr(bNumEndpoints, "%02x\n") 685 usb_intf_attr(bInterfaceClass, "%02x\n") 686 usb_intf_attr(bInterfaceSubClass, "%02x\n") 687 usb_intf_attr(bInterfaceProtocol, "%02x\n") 688 689 static ssize_t show_interface_string(struct device *dev, 690 struct device_attribute *attr, char *buf) 691 { 692 struct usb_interface *intf; 693 struct usb_device *udev; 694 int len; 695 696 intf = to_usb_interface(dev); 697 udev = interface_to_usbdev(intf); 698 len = snprintf(buf, 256, "%s", intf->cur_altsetting->string); 699 if (len < 0) 700 return 0; 701 buf[len] = '\n'; 702 buf[len+1] = 0; 703 return len+1; 704 } 705 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL); 706 707 static ssize_t show_modalias(struct device *dev, 708 struct device_attribute *attr, char *buf) 709 { 710 struct usb_interface *intf; 711 struct usb_device *udev; 712 struct usb_host_interface *alt; 713 714 intf = to_usb_interface(dev); 715 udev = interface_to_usbdev(intf); 716 alt = intf->cur_altsetting; 717 718 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X" 719 "ic%02Xisc%02Xip%02X\n", 720 le16_to_cpu(udev->descriptor.idVendor), 721 le16_to_cpu(udev->descriptor.idProduct), 722 le16_to_cpu(udev->descriptor.bcdDevice), 723 udev->descriptor.bDeviceClass, 724 udev->descriptor.bDeviceSubClass, 725 udev->descriptor.bDeviceProtocol, 726 alt->desc.bInterfaceClass, 727 alt->desc.bInterfaceSubClass, 728 alt->desc.bInterfaceProtocol); 729 } 730 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); 731 732 static struct attribute *intf_assoc_attrs[] = { 733 &dev_attr_iad_bFirstInterface.attr, 734 &dev_attr_iad_bInterfaceCount.attr, 735 &dev_attr_iad_bFunctionClass.attr, 736 &dev_attr_iad_bFunctionSubClass.attr, 737 &dev_attr_iad_bFunctionProtocol.attr, 738 NULL, 739 }; 740 static struct attribute_group intf_assoc_attr_grp = { 741 .attrs = intf_assoc_attrs, 742 }; 743 744 static struct attribute *intf_attrs[] = { 745 &dev_attr_bInterfaceNumber.attr, 746 &dev_attr_bAlternateSetting.attr, 747 &dev_attr_bNumEndpoints.attr, 748 &dev_attr_bInterfaceClass.attr, 749 &dev_attr_bInterfaceSubClass.attr, 750 &dev_attr_bInterfaceProtocol.attr, 751 &dev_attr_modalias.attr, 752 NULL, 753 }; 754 static struct attribute_group intf_attr_grp = { 755 .attrs = intf_attrs, 756 }; 757 758 static inline void usb_create_intf_ep_files(struct usb_interface *intf, 759 struct usb_device *udev) 760 { 761 struct usb_host_interface *iface_desc; 762 int i; 763 764 iface_desc = intf->cur_altsetting; 765 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) 766 usb_create_ep_files(&intf->dev, &iface_desc->endpoint[i], 767 udev); 768 } 769 770 static inline void usb_remove_intf_ep_files(struct usb_interface *intf) 771 { 772 struct usb_host_interface *iface_desc; 773 int i; 774 775 iface_desc = intf->cur_altsetting; 776 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) 777 usb_remove_ep_files(&iface_desc->endpoint[i]); 778 } 779 780 int usb_create_sysfs_intf_files(struct usb_interface *intf) 781 { 782 struct device *dev = &intf->dev; 783 struct usb_device *udev = interface_to_usbdev(intf); 784 struct usb_host_interface *alt = intf->cur_altsetting; 785 int retval; 786 787 if (intf->sysfs_files_created) 788 return 0; 789 retval = sysfs_create_group(&dev->kobj, &intf_attr_grp); 790 if (retval) 791 return retval; 792 793 if (alt->string == NULL) 794 alt->string = usb_cache_string(udev, alt->desc.iInterface); 795 if (alt->string) 796 retval = device_create_file(dev, &dev_attr_interface); 797 if (intf->intf_assoc) 798 retval = sysfs_create_group(&dev->kobj, &intf_assoc_attr_grp); 799 usb_create_intf_ep_files(intf, udev); 800 intf->sysfs_files_created = 1; 801 return 0; 802 } 803 804 void usb_remove_sysfs_intf_files(struct usb_interface *intf) 805 { 806 struct device *dev = &intf->dev; 807 808 if (!intf->sysfs_files_created) 809 return; 810 usb_remove_intf_ep_files(intf); 811 device_remove_file(dev, &dev_attr_interface); 812 sysfs_remove_group(&dev->kobj, &intf_attr_grp); 813 sysfs_remove_group(&intf->dev.kobj, &intf_assoc_attr_grp); 814 intf->sysfs_files_created = 0; 815 } 816