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 <linux/usb/quirks.h> 17 #include "usb.h" 18 19 /* Active configuration fields */ 20 #define usb_actconfig_show(field, multiplier, format_string) \ 21 static ssize_t show_##field(struct device *dev, \ 22 struct device_attribute *attr, char *buf) \ 23 { \ 24 struct usb_device *udev; \ 25 struct usb_host_config *actconfig; \ 26 \ 27 udev = to_usb_device(dev); \ 28 actconfig = udev->actconfig; \ 29 if (actconfig) \ 30 return sprintf(buf, format_string, \ 31 actconfig->desc.field * multiplier); \ 32 else \ 33 return 0; \ 34 } \ 35 36 #define usb_actconfig_attr(field, multiplier, format_string) \ 37 usb_actconfig_show(field, multiplier, format_string) \ 38 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 39 40 usb_actconfig_attr(bNumInterfaces, 1, "%2d\n") 41 usb_actconfig_attr(bmAttributes, 1, "%2x\n") 42 usb_actconfig_attr(bMaxPower, 2, "%3dmA\n") 43 44 static ssize_t show_configuration_string(struct device *dev, 45 struct device_attribute *attr, char *buf) 46 { 47 struct usb_device *udev; 48 struct usb_host_config *actconfig; 49 50 udev = to_usb_device(dev); 51 actconfig = udev->actconfig; 52 if ((!actconfig) || (!actconfig->string)) 53 return 0; 54 return sprintf(buf, "%s\n", actconfig->string); 55 } 56 static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL); 57 58 /* configuration value is always present, and r/w */ 59 usb_actconfig_show(bConfigurationValue, 1, "%u\n"); 60 61 static ssize_t 62 set_bConfigurationValue(struct device *dev, struct device_attribute *attr, 63 const char *buf, size_t count) 64 { 65 struct usb_device *udev = to_usb_device(dev); 66 int config, value; 67 68 if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255) 69 return -EINVAL; 70 usb_lock_device(udev); 71 value = usb_set_configuration(udev, config); 72 usb_unlock_device(udev); 73 return (value < 0) ? value : count; 74 } 75 76 static DEVICE_ATTR(bConfigurationValue, S_IRUGO | S_IWUSR, 77 show_bConfigurationValue, set_bConfigurationValue); 78 79 /* String fields */ 80 #define usb_string_attr(name) \ 81 static ssize_t show_##name(struct device *dev, \ 82 struct device_attribute *attr, char *buf) \ 83 { \ 84 struct usb_device *udev; \ 85 \ 86 udev = to_usb_device(dev); \ 87 return sprintf(buf, "%s\n", udev->name); \ 88 } \ 89 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); 90 91 usb_string_attr(product); 92 usb_string_attr(manufacturer); 93 usb_string_attr(serial); 94 95 static ssize_t 96 show_speed(struct device *dev, struct device_attribute *attr, char *buf) 97 { 98 struct usb_device *udev; 99 char *speed; 100 101 udev = to_usb_device(dev); 102 103 switch (udev->speed) { 104 case USB_SPEED_LOW: 105 speed = "1.5"; 106 break; 107 case USB_SPEED_UNKNOWN: 108 case USB_SPEED_FULL: 109 speed = "12"; 110 break; 111 case USB_SPEED_HIGH: 112 speed = "480"; 113 break; 114 default: 115 speed = "unknown"; 116 } 117 return sprintf(buf, "%s\n", speed); 118 } 119 static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL); 120 121 static ssize_t 122 show_busnum(struct device *dev, struct device_attribute *attr, char *buf) 123 { 124 struct usb_device *udev; 125 126 udev = to_usb_device(dev); 127 return sprintf(buf, "%d\n", udev->bus->busnum); 128 } 129 static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL); 130 131 static ssize_t 132 show_devnum(struct device *dev, struct device_attribute *attr, char *buf) 133 { 134 struct usb_device *udev; 135 136 udev = to_usb_device(dev); 137 return sprintf(buf, "%d\n", udev->devnum); 138 } 139 static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL); 140 141 static ssize_t 142 show_devpath(struct device *dev, struct device_attribute *attr, char *buf) 143 { 144 struct usb_device *udev; 145 146 udev = to_usb_device(dev); 147 return sprintf(buf, "%s\n", udev->devpath); 148 } 149 static DEVICE_ATTR(devpath, S_IRUGO, show_devpath, NULL); 150 151 static ssize_t 152 show_version(struct device *dev, struct device_attribute *attr, char *buf) 153 { 154 struct usb_device *udev; 155 u16 bcdUSB; 156 157 udev = to_usb_device(dev); 158 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB); 159 return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff); 160 } 161 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); 162 163 static ssize_t 164 show_maxchild(struct device *dev, struct device_attribute *attr, char *buf) 165 { 166 struct usb_device *udev; 167 168 udev = to_usb_device(dev); 169 return sprintf(buf, "%d\n", udev->maxchild); 170 } 171 static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL); 172 173 static ssize_t 174 show_quirks(struct device *dev, struct device_attribute *attr, char *buf) 175 { 176 struct usb_device *udev; 177 178 udev = to_usb_device(dev); 179 return sprintf(buf, "0x%x\n", udev->quirks); 180 } 181 static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL); 182 183 static ssize_t 184 show_urbnum(struct device *dev, struct device_attribute *attr, char *buf) 185 { 186 struct usb_device *udev; 187 188 udev = to_usb_device(dev); 189 return sprintf(buf, "%d\n", atomic_read(&udev->urbnum)); 190 } 191 static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL); 192 193 194 #ifdef CONFIG_PM 195 196 static const char power_group[] = "power"; 197 198 static ssize_t 199 show_persist(struct device *dev, struct device_attribute *attr, char *buf) 200 { 201 struct usb_device *udev = to_usb_device(dev); 202 203 return sprintf(buf, "%d\n", udev->persist_enabled); 204 } 205 206 static ssize_t 207 set_persist(struct device *dev, struct device_attribute *attr, 208 const char *buf, size_t count) 209 { 210 struct usb_device *udev = to_usb_device(dev); 211 int value; 212 213 /* Hubs are always enabled for USB_PERSIST */ 214 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) 215 return -EPERM; 216 217 if (sscanf(buf, "%d", &value) != 1) 218 return -EINVAL; 219 usb_pm_lock(udev); 220 udev->persist_enabled = !!value; 221 usb_pm_unlock(udev); 222 return count; 223 } 224 225 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist); 226 227 static int add_persist_attributes(struct device *dev) 228 { 229 int rc = 0; 230 231 if (is_usb_device(dev)) { 232 struct usb_device *udev = to_usb_device(dev); 233 234 /* Hubs are automatically enabled for USB_PERSIST, 235 * no point in creating the attribute file. 236 */ 237 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB) 238 rc = sysfs_add_file_to_group(&dev->kobj, 239 &dev_attr_persist.attr, 240 power_group); 241 } 242 return rc; 243 } 244 245 static void remove_persist_attributes(struct device *dev) 246 { 247 sysfs_remove_file_from_group(&dev->kobj, 248 &dev_attr_persist.attr, 249 power_group); 250 } 251 #else 252 253 #define add_persist_attributes(dev) 0 254 #define remove_persist_attributes(dev) do {} while (0) 255 256 #endif /* CONFIG_PM */ 257 258 #ifdef CONFIG_USB_SUSPEND 259 260 static ssize_t 261 show_connected_duration(struct device *dev, struct device_attribute *attr, 262 char *buf) 263 { 264 struct usb_device *udev = to_usb_device(dev); 265 266 return sprintf(buf, "%u\n", 267 jiffies_to_msecs(jiffies - udev->connect_time)); 268 } 269 270 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL); 271 272 /* 273 * If the device is resumed, the last time the device was suspended has 274 * been pre-subtracted from active_duration. We add the current time to 275 * get the duration that the device was actually active. 276 * 277 * If the device is suspended, the active_duration is up-to-date. 278 */ 279 static ssize_t 280 show_active_duration(struct device *dev, struct device_attribute *attr, 281 char *buf) 282 { 283 struct usb_device *udev = to_usb_device(dev); 284 int duration; 285 286 if (udev->state != USB_STATE_SUSPENDED) 287 duration = jiffies_to_msecs(jiffies + udev->active_duration); 288 else 289 duration = jiffies_to_msecs(udev->active_duration); 290 return sprintf(buf, "%u\n", duration); 291 } 292 293 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL); 294 295 static ssize_t 296 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf) 297 { 298 struct usb_device *udev = to_usb_device(dev); 299 300 return sprintf(buf, "%d\n", udev->autosuspend_delay / HZ); 301 } 302 303 static ssize_t 304 set_autosuspend(struct device *dev, struct device_attribute *attr, 305 const char *buf, size_t count) 306 { 307 struct usb_device *udev = to_usb_device(dev); 308 int value; 309 310 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/HZ || 311 value <= - INT_MAX/HZ) 312 return -EINVAL; 313 value *= HZ; 314 315 udev->autosuspend_delay = value; 316 if (value >= 0) 317 usb_try_autosuspend_device(udev); 318 else { 319 if (usb_autoresume_device(udev) == 0) 320 usb_autosuspend_device(udev); 321 } 322 return count; 323 } 324 325 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR, 326 show_autosuspend, set_autosuspend); 327 328 static const char on_string[] = "on"; 329 static const char auto_string[] = "auto"; 330 331 static ssize_t 332 show_level(struct device *dev, struct device_attribute *attr, char *buf) 333 { 334 struct usb_device *udev = to_usb_device(dev); 335 const char *p = auto_string; 336 337 if (udev->state != USB_STATE_SUSPENDED && udev->autosuspend_disabled) 338 p = on_string; 339 return sprintf(buf, "%s\n", p); 340 } 341 342 static ssize_t 343 set_level(struct device *dev, struct device_attribute *attr, 344 const char *buf, size_t count) 345 { 346 struct usb_device *udev = to_usb_device(dev); 347 int len = count; 348 char *cp; 349 int rc = 0; 350 int old_autosuspend_disabled; 351 352 cp = memchr(buf, '\n', count); 353 if (cp) 354 len = cp - buf; 355 356 usb_lock_device(udev); 357 old_autosuspend_disabled = udev->autosuspend_disabled; 358 359 /* Setting the flags without calling usb_pm_lock is a subject to 360 * races, but who cares... 361 */ 362 if (len == sizeof on_string - 1 && 363 strncmp(buf, on_string, len) == 0) { 364 udev->autosuspend_disabled = 1; 365 rc = usb_external_resume_device(udev, PMSG_USER_RESUME); 366 367 } else if (len == sizeof auto_string - 1 && 368 strncmp(buf, auto_string, len) == 0) { 369 udev->autosuspend_disabled = 0; 370 rc = usb_external_resume_device(udev, PMSG_USER_RESUME); 371 372 } else 373 rc = -EINVAL; 374 375 if (rc) 376 udev->autosuspend_disabled = old_autosuspend_disabled; 377 usb_unlock_device(udev); 378 return (rc < 0 ? rc : count); 379 } 380 381 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level); 382 383 static int add_power_attributes(struct device *dev) 384 { 385 int rc = 0; 386 387 if (is_usb_device(dev)) { 388 rc = sysfs_add_file_to_group(&dev->kobj, 389 &dev_attr_autosuspend.attr, 390 power_group); 391 if (rc == 0) 392 rc = sysfs_add_file_to_group(&dev->kobj, 393 &dev_attr_level.attr, 394 power_group); 395 if (rc == 0) 396 rc = sysfs_add_file_to_group(&dev->kobj, 397 &dev_attr_connected_duration.attr, 398 power_group); 399 if (rc == 0) 400 rc = sysfs_add_file_to_group(&dev->kobj, 401 &dev_attr_active_duration.attr, 402 power_group); 403 } 404 return rc; 405 } 406 407 static void remove_power_attributes(struct device *dev) 408 { 409 sysfs_remove_file_from_group(&dev->kobj, 410 &dev_attr_active_duration.attr, 411 power_group); 412 sysfs_remove_file_from_group(&dev->kobj, 413 &dev_attr_connected_duration.attr, 414 power_group); 415 sysfs_remove_file_from_group(&dev->kobj, 416 &dev_attr_level.attr, 417 power_group); 418 sysfs_remove_file_from_group(&dev->kobj, 419 &dev_attr_autosuspend.attr, 420 power_group); 421 } 422 423 #else 424 425 #define add_power_attributes(dev) 0 426 #define remove_power_attributes(dev) do {} while (0) 427 428 #endif /* CONFIG_USB_SUSPEND */ 429 430 431 /* Descriptor fields */ 432 #define usb_descriptor_attr_le16(field, format_string) \ 433 static ssize_t \ 434 show_##field(struct device *dev, struct device_attribute *attr, \ 435 char *buf) \ 436 { \ 437 struct usb_device *udev; \ 438 \ 439 udev = to_usb_device(dev); \ 440 return sprintf(buf, format_string, \ 441 le16_to_cpu(udev->descriptor.field)); \ 442 } \ 443 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 444 445 usb_descriptor_attr_le16(idVendor, "%04x\n") 446 usb_descriptor_attr_le16(idProduct, "%04x\n") 447 usb_descriptor_attr_le16(bcdDevice, "%04x\n") 448 449 #define usb_descriptor_attr(field, format_string) \ 450 static ssize_t \ 451 show_##field(struct device *dev, struct device_attribute *attr, \ 452 char *buf) \ 453 { \ 454 struct usb_device *udev; \ 455 \ 456 udev = to_usb_device(dev); \ 457 return sprintf(buf, format_string, udev->descriptor.field); \ 458 } \ 459 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 460 461 usb_descriptor_attr(bDeviceClass, "%02x\n") 462 usb_descriptor_attr(bDeviceSubClass, "%02x\n") 463 usb_descriptor_attr(bDeviceProtocol, "%02x\n") 464 usb_descriptor_attr(bNumConfigurations, "%d\n") 465 usb_descriptor_attr(bMaxPacketSize0, "%d\n") 466 467 468 469 /* show if the device is authorized (1) or not (0) */ 470 static ssize_t usb_dev_authorized_show(struct device *dev, 471 struct device_attribute *attr, 472 char *buf) 473 { 474 struct usb_device *usb_dev = to_usb_device(dev); 475 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized); 476 } 477 478 479 /* 480 * Authorize a device to be used in the system 481 * 482 * Writing a 0 deauthorizes the device, writing a 1 authorizes it. 483 */ 484 static ssize_t usb_dev_authorized_store(struct device *dev, 485 struct device_attribute *attr, 486 const char *buf, size_t size) 487 { 488 ssize_t result; 489 struct usb_device *usb_dev = to_usb_device(dev); 490 unsigned val; 491 result = sscanf(buf, "%u\n", &val); 492 if (result != 1) 493 result = -EINVAL; 494 else if (val == 0) 495 result = usb_deauthorize_device(usb_dev); 496 else 497 result = usb_authorize_device(usb_dev); 498 return result < 0? result : size; 499 } 500 501 static DEVICE_ATTR(authorized, 0644, 502 usb_dev_authorized_show, usb_dev_authorized_store); 503 504 /* "Safely remove a device" */ 505 static ssize_t usb_remove_store(struct device *dev, 506 struct device_attribute *attr, 507 const char *buf, size_t count) 508 { 509 struct usb_device *udev = to_usb_device(dev); 510 int rc = 0; 511 512 usb_lock_device(udev); 513 if (udev->state != USB_STATE_NOTATTACHED) { 514 515 /* To avoid races, first unconfigure and then remove */ 516 usb_set_configuration(udev, -1); 517 rc = usb_remove_device(udev); 518 } 519 if (rc == 0) 520 rc = count; 521 usb_unlock_device(udev); 522 return rc; 523 } 524 static DEVICE_ATTR(remove, 0200, NULL, usb_remove_store); 525 526 527 static struct attribute *dev_attrs[] = { 528 /* current configuration's attributes */ 529 &dev_attr_configuration.attr, 530 &dev_attr_bNumInterfaces.attr, 531 &dev_attr_bConfigurationValue.attr, 532 &dev_attr_bmAttributes.attr, 533 &dev_attr_bMaxPower.attr, 534 /* device attributes */ 535 &dev_attr_urbnum.attr, 536 &dev_attr_idVendor.attr, 537 &dev_attr_idProduct.attr, 538 &dev_attr_bcdDevice.attr, 539 &dev_attr_bDeviceClass.attr, 540 &dev_attr_bDeviceSubClass.attr, 541 &dev_attr_bDeviceProtocol.attr, 542 &dev_attr_bNumConfigurations.attr, 543 &dev_attr_bMaxPacketSize0.attr, 544 &dev_attr_speed.attr, 545 &dev_attr_busnum.attr, 546 &dev_attr_devnum.attr, 547 &dev_attr_devpath.attr, 548 &dev_attr_version.attr, 549 &dev_attr_maxchild.attr, 550 &dev_attr_quirks.attr, 551 &dev_attr_authorized.attr, 552 &dev_attr_remove.attr, 553 NULL, 554 }; 555 static struct attribute_group dev_attr_grp = { 556 .attrs = dev_attrs, 557 }; 558 559 /* When modifying this list, be sure to modify dev_string_attrs_are_visible() 560 * accordingly. 561 */ 562 static struct attribute *dev_string_attrs[] = { 563 &dev_attr_manufacturer.attr, 564 &dev_attr_product.attr, 565 &dev_attr_serial.attr, 566 NULL 567 }; 568 569 static mode_t dev_string_attrs_are_visible(struct kobject *kobj, 570 struct attribute *a, int n) 571 { 572 struct device *dev = container_of(kobj, struct device, kobj); 573 struct usb_device *udev = to_usb_device(dev); 574 575 if (a == &dev_attr_manufacturer.attr) { 576 if (udev->manufacturer == NULL) 577 return 0; 578 } else if (a == &dev_attr_product.attr) { 579 if (udev->product == NULL) 580 return 0; 581 } else if (a == &dev_attr_serial.attr) { 582 if (udev->serial == NULL) 583 return 0; 584 } 585 return a->mode; 586 } 587 588 static struct attribute_group dev_string_attr_grp = { 589 .attrs = dev_string_attrs, 590 .is_visible = dev_string_attrs_are_visible, 591 }; 592 593 const struct attribute_group *usb_device_groups[] = { 594 &dev_attr_grp, 595 &dev_string_attr_grp, 596 NULL 597 }; 598 599 /* Binary descriptors */ 600 601 static ssize_t 602 read_descriptors(struct kobject *kobj, struct bin_attribute *attr, 603 char *buf, loff_t off, size_t count) 604 { 605 struct device *dev = container_of(kobj, struct device, kobj); 606 struct usb_device *udev = to_usb_device(dev); 607 size_t nleft = count; 608 size_t srclen, n; 609 int cfgno; 610 void *src; 611 612 /* The binary attribute begins with the device descriptor. 613 * Following that are the raw descriptor entries for all the 614 * configurations (config plus subsidiary descriptors). 615 */ 616 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations && 617 nleft > 0; ++cfgno) { 618 if (cfgno < 0) { 619 src = &udev->descriptor; 620 srclen = sizeof(struct usb_device_descriptor); 621 } else { 622 src = udev->rawdescriptors[cfgno]; 623 srclen = __le16_to_cpu(udev->config[cfgno].desc. 624 wTotalLength); 625 } 626 if (off < srclen) { 627 n = min(nleft, srclen - (size_t) off); 628 memcpy(buf, src + off, n); 629 nleft -= n; 630 buf += n; 631 off = 0; 632 } else { 633 off -= srclen; 634 } 635 } 636 return count - nleft; 637 } 638 639 static struct bin_attribute dev_bin_attr_descriptors = { 640 .attr = {.name = "descriptors", .mode = 0444}, 641 .read = read_descriptors, 642 .size = 18 + 65535, /* dev descr + max-size raw descriptor */ 643 }; 644 645 int usb_create_sysfs_dev_files(struct usb_device *udev) 646 { 647 struct device *dev = &udev->dev; 648 int retval; 649 650 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors); 651 if (retval) 652 goto error; 653 654 retval = add_persist_attributes(dev); 655 if (retval) 656 goto error; 657 658 retval = add_power_attributes(dev); 659 if (retval) 660 goto error; 661 return retval; 662 error: 663 usb_remove_sysfs_dev_files(udev); 664 return retval; 665 } 666 667 void usb_remove_sysfs_dev_files(struct usb_device *udev) 668 { 669 struct device *dev = &udev->dev; 670 671 remove_power_attributes(dev); 672 remove_persist_attributes(dev); 673 device_remove_bin_file(dev, &dev_bin_attr_descriptors); 674 } 675 676 /* Interface Accociation Descriptor fields */ 677 #define usb_intf_assoc_attr(field, format_string) \ 678 static ssize_t \ 679 show_iad_##field(struct device *dev, struct device_attribute *attr, \ 680 char *buf) \ 681 { \ 682 struct usb_interface *intf = to_usb_interface(dev); \ 683 \ 684 return sprintf(buf, format_string, \ 685 intf->intf_assoc->field); \ 686 } \ 687 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL); 688 689 usb_intf_assoc_attr(bFirstInterface, "%02x\n") 690 usb_intf_assoc_attr(bInterfaceCount, "%02d\n") 691 usb_intf_assoc_attr(bFunctionClass, "%02x\n") 692 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n") 693 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n") 694 695 /* Interface fields */ 696 #define usb_intf_attr(field, format_string) \ 697 static ssize_t \ 698 show_##field(struct device *dev, struct device_attribute *attr, \ 699 char *buf) \ 700 { \ 701 struct usb_interface *intf = to_usb_interface(dev); \ 702 \ 703 return sprintf(buf, format_string, \ 704 intf->cur_altsetting->desc.field); \ 705 } \ 706 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 707 708 usb_intf_attr(bInterfaceNumber, "%02x\n") 709 usb_intf_attr(bAlternateSetting, "%2d\n") 710 usb_intf_attr(bNumEndpoints, "%02x\n") 711 usb_intf_attr(bInterfaceClass, "%02x\n") 712 usb_intf_attr(bInterfaceSubClass, "%02x\n") 713 usb_intf_attr(bInterfaceProtocol, "%02x\n") 714 715 static ssize_t show_interface_string(struct device *dev, 716 struct device_attribute *attr, char *buf) 717 { 718 struct usb_interface *intf; 719 char *string; 720 721 intf = to_usb_interface(dev); 722 string = intf->cur_altsetting->string; 723 barrier(); /* The altsetting might change! */ 724 725 if (!string) 726 return 0; 727 return sprintf(buf, "%s\n", string); 728 } 729 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL); 730 731 static ssize_t show_modalias(struct device *dev, 732 struct device_attribute *attr, char *buf) 733 { 734 struct usb_interface *intf; 735 struct usb_device *udev; 736 struct usb_host_interface *alt; 737 738 intf = to_usb_interface(dev); 739 udev = interface_to_usbdev(intf); 740 alt = intf->cur_altsetting; 741 742 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X" 743 "ic%02Xisc%02Xip%02X\n", 744 le16_to_cpu(udev->descriptor.idVendor), 745 le16_to_cpu(udev->descriptor.idProduct), 746 le16_to_cpu(udev->descriptor.bcdDevice), 747 udev->descriptor.bDeviceClass, 748 udev->descriptor.bDeviceSubClass, 749 udev->descriptor.bDeviceProtocol, 750 alt->desc.bInterfaceClass, 751 alt->desc.bInterfaceSubClass, 752 alt->desc.bInterfaceProtocol); 753 } 754 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); 755 756 static ssize_t show_supports_autosuspend(struct device *dev, 757 struct device_attribute *attr, char *buf) 758 { 759 struct usb_interface *intf; 760 struct usb_device *udev; 761 int ret; 762 763 intf = to_usb_interface(dev); 764 udev = interface_to_usbdev(intf); 765 766 usb_lock_device(udev); 767 /* Devices will be autosuspended even when an interface isn't claimed */ 768 if (!intf->dev.driver || 769 to_usb_driver(intf->dev.driver)->supports_autosuspend) 770 ret = sprintf(buf, "%u\n", 1); 771 else 772 ret = sprintf(buf, "%u\n", 0); 773 usb_unlock_device(udev); 774 775 return ret; 776 } 777 static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL); 778 779 static struct attribute *intf_attrs[] = { 780 &dev_attr_bInterfaceNumber.attr, 781 &dev_attr_bAlternateSetting.attr, 782 &dev_attr_bNumEndpoints.attr, 783 &dev_attr_bInterfaceClass.attr, 784 &dev_attr_bInterfaceSubClass.attr, 785 &dev_attr_bInterfaceProtocol.attr, 786 &dev_attr_modalias.attr, 787 &dev_attr_supports_autosuspend.attr, 788 NULL, 789 }; 790 static struct attribute_group intf_attr_grp = { 791 .attrs = intf_attrs, 792 }; 793 794 static struct attribute *intf_assoc_attrs[] = { 795 &dev_attr_iad_bFirstInterface.attr, 796 &dev_attr_iad_bInterfaceCount.attr, 797 &dev_attr_iad_bFunctionClass.attr, 798 &dev_attr_iad_bFunctionSubClass.attr, 799 &dev_attr_iad_bFunctionProtocol.attr, 800 NULL, 801 }; 802 803 static mode_t intf_assoc_attrs_are_visible(struct kobject *kobj, 804 struct attribute *a, int n) 805 { 806 struct device *dev = container_of(kobj, struct device, kobj); 807 struct usb_interface *intf = to_usb_interface(dev); 808 809 if (intf->intf_assoc == NULL) 810 return 0; 811 return a->mode; 812 } 813 814 static struct attribute_group intf_assoc_attr_grp = { 815 .attrs = intf_assoc_attrs, 816 .is_visible = intf_assoc_attrs_are_visible, 817 }; 818 819 const struct attribute_group *usb_interface_groups[] = { 820 &intf_attr_grp, 821 &intf_assoc_attr_grp, 822 NULL 823 }; 824 825 int usb_create_sysfs_intf_files(struct usb_interface *intf) 826 { 827 struct usb_device *udev = interface_to_usbdev(intf); 828 struct usb_host_interface *alt = intf->cur_altsetting; 829 int retval; 830 831 if (intf->sysfs_files_created || intf->unregistering) 832 return 0; 833 834 if (alt->string == NULL && 835 !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS)) 836 alt->string = usb_cache_string(udev, alt->desc.iInterface); 837 if (alt->string) 838 retval = device_create_file(&intf->dev, &dev_attr_interface); 839 intf->sysfs_files_created = 1; 840 return 0; 841 } 842 843 void usb_remove_sysfs_intf_files(struct usb_interface *intf) 844 { 845 if (!intf->sysfs_files_created) 846 return; 847 848 device_remove_file(&intf->dev, &dev_attr_interface); 849 intf->sysfs_files_created = 0; 850 } 851