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 int retval; \ 86 \ 87 udev = to_usb_device(dev); \ 88 usb_lock_device(udev); \ 89 retval = sprintf(buf, "%s\n", udev->name); \ 90 usb_unlock_device(udev); \ 91 return retval; \ 92 } \ 93 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); 94 95 usb_string_attr(product); 96 usb_string_attr(manufacturer); 97 usb_string_attr(serial); 98 99 static ssize_t 100 show_speed(struct device *dev, struct device_attribute *attr, char *buf) 101 { 102 struct usb_device *udev; 103 char *speed; 104 105 udev = to_usb_device(dev); 106 107 switch (udev->speed) { 108 case USB_SPEED_LOW: 109 speed = "1.5"; 110 break; 111 case USB_SPEED_UNKNOWN: 112 case USB_SPEED_FULL: 113 speed = "12"; 114 break; 115 case USB_SPEED_HIGH: 116 speed = "480"; 117 break; 118 case USB_SPEED_WIRELESS: 119 speed = "480"; 120 break; 121 case USB_SPEED_SUPER: 122 speed = "5000"; 123 break; 124 default: 125 speed = "unknown"; 126 } 127 return sprintf(buf, "%s\n", speed); 128 } 129 static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL); 130 131 static ssize_t 132 show_busnum(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->bus->busnum); 138 } 139 static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL); 140 141 static ssize_t 142 show_devnum(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, "%d\n", udev->devnum); 148 } 149 static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL); 150 151 static ssize_t 152 show_devpath(struct device *dev, struct device_attribute *attr, char *buf) 153 { 154 struct usb_device *udev; 155 156 udev = to_usb_device(dev); 157 return sprintf(buf, "%s\n", udev->devpath); 158 } 159 static DEVICE_ATTR(devpath, S_IRUGO, show_devpath, NULL); 160 161 static ssize_t 162 show_version(struct device *dev, struct device_attribute *attr, char *buf) 163 { 164 struct usb_device *udev; 165 u16 bcdUSB; 166 167 udev = to_usb_device(dev); 168 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB); 169 return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff); 170 } 171 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); 172 173 static ssize_t 174 show_maxchild(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, "%d\n", udev->maxchild); 180 } 181 static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL); 182 183 static ssize_t 184 show_quirks(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, "0x%x\n", udev->quirks); 190 } 191 static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL); 192 193 static ssize_t 194 show_avoid_reset_quirk(struct device *dev, struct device_attribute *attr, char *buf) 195 { 196 struct usb_device *udev; 197 198 udev = to_usb_device(dev); 199 return sprintf(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET_MORPHS)); 200 } 201 202 static ssize_t 203 set_avoid_reset_quirk(struct device *dev, struct device_attribute *attr, 204 const char *buf, size_t count) 205 { 206 struct usb_device *udev = to_usb_device(dev); 207 int config; 208 209 if (sscanf(buf, "%d", &config) != 1 || config < 0 || config > 1) 210 return -EINVAL; 211 usb_lock_device(udev); 212 if (config) 213 udev->quirks |= USB_QUIRK_RESET_MORPHS; 214 else 215 udev->quirks &= ~USB_QUIRK_RESET_MORPHS; 216 usb_unlock_device(udev); 217 return count; 218 } 219 220 static DEVICE_ATTR(avoid_reset_quirk, S_IRUGO | S_IWUSR, 221 show_avoid_reset_quirk, set_avoid_reset_quirk); 222 223 static ssize_t 224 show_urbnum(struct device *dev, struct device_attribute *attr, char *buf) 225 { 226 struct usb_device *udev; 227 228 udev = to_usb_device(dev); 229 return sprintf(buf, "%d\n", atomic_read(&udev->urbnum)); 230 } 231 static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL); 232 233 234 #ifdef CONFIG_PM 235 236 static ssize_t 237 show_persist(struct device *dev, struct device_attribute *attr, char *buf) 238 { 239 struct usb_device *udev = to_usb_device(dev); 240 241 return sprintf(buf, "%d\n", udev->persist_enabled); 242 } 243 244 static ssize_t 245 set_persist(struct device *dev, struct device_attribute *attr, 246 const char *buf, size_t count) 247 { 248 struct usb_device *udev = to_usb_device(dev); 249 int value; 250 251 /* Hubs are always enabled for USB_PERSIST */ 252 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) 253 return -EPERM; 254 255 if (sscanf(buf, "%d", &value) != 1) 256 return -EINVAL; 257 258 usb_lock_device(udev); 259 udev->persist_enabled = !!value; 260 usb_unlock_device(udev); 261 return count; 262 } 263 264 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist); 265 266 static int add_persist_attributes(struct device *dev) 267 { 268 int rc = 0; 269 270 if (is_usb_device(dev)) { 271 struct usb_device *udev = to_usb_device(dev); 272 273 /* Hubs are automatically enabled for USB_PERSIST, 274 * no point in creating the attribute file. 275 */ 276 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB) 277 rc = sysfs_add_file_to_group(&dev->kobj, 278 &dev_attr_persist.attr, 279 power_group_name); 280 } 281 return rc; 282 } 283 284 static void remove_persist_attributes(struct device *dev) 285 { 286 sysfs_remove_file_from_group(&dev->kobj, 287 &dev_attr_persist.attr, 288 power_group_name); 289 } 290 #else 291 292 #define add_persist_attributes(dev) 0 293 #define remove_persist_attributes(dev) do {} while (0) 294 295 #endif /* CONFIG_PM */ 296 297 #ifdef CONFIG_USB_SUSPEND 298 299 static ssize_t 300 show_connected_duration(struct device *dev, struct device_attribute *attr, 301 char *buf) 302 { 303 struct usb_device *udev = to_usb_device(dev); 304 305 return sprintf(buf, "%u\n", 306 jiffies_to_msecs(jiffies - udev->connect_time)); 307 } 308 309 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL); 310 311 /* 312 * If the device is resumed, the last time the device was suspended has 313 * been pre-subtracted from active_duration. We add the current time to 314 * get the duration that the device was actually active. 315 * 316 * If the device is suspended, the active_duration is up-to-date. 317 */ 318 static ssize_t 319 show_active_duration(struct device *dev, struct device_attribute *attr, 320 char *buf) 321 { 322 struct usb_device *udev = to_usb_device(dev); 323 int duration; 324 325 if (udev->state != USB_STATE_SUSPENDED) 326 duration = jiffies_to_msecs(jiffies + udev->active_duration); 327 else 328 duration = jiffies_to_msecs(udev->active_duration); 329 return sprintf(buf, "%u\n", duration); 330 } 331 332 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL); 333 334 static ssize_t 335 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf) 336 { 337 return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000); 338 } 339 340 static ssize_t 341 set_autosuspend(struct device *dev, struct device_attribute *attr, 342 const char *buf, size_t count) 343 { 344 int value; 345 346 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 || 347 value <= -INT_MAX/1000) 348 return -EINVAL; 349 350 pm_runtime_set_autosuspend_delay(dev, value * 1000); 351 return count; 352 } 353 354 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR, 355 show_autosuspend, set_autosuspend); 356 357 static const char on_string[] = "on"; 358 static const char auto_string[] = "auto"; 359 360 static void warn_level(void) { 361 static int level_warned; 362 363 if (!level_warned) { 364 level_warned = 1; 365 printk(KERN_WARNING "WARNING! power/level is deprecated; " 366 "use power/control instead\n"); 367 } 368 } 369 370 static ssize_t 371 show_level(struct device *dev, struct device_attribute *attr, char *buf) 372 { 373 struct usb_device *udev = to_usb_device(dev); 374 const char *p = auto_string; 375 376 warn_level(); 377 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto) 378 p = on_string; 379 return sprintf(buf, "%s\n", p); 380 } 381 382 static ssize_t 383 set_level(struct device *dev, struct device_attribute *attr, 384 const char *buf, size_t count) 385 { 386 struct usb_device *udev = to_usb_device(dev); 387 int len = count; 388 char *cp; 389 int rc = count; 390 391 warn_level(); 392 cp = memchr(buf, '\n', count); 393 if (cp) 394 len = cp - buf; 395 396 usb_lock_device(udev); 397 398 if (len == sizeof on_string - 1 && 399 strncmp(buf, on_string, len) == 0) 400 usb_disable_autosuspend(udev); 401 402 else if (len == sizeof auto_string - 1 && 403 strncmp(buf, auto_string, len) == 0) 404 usb_enable_autosuspend(udev); 405 406 else 407 rc = -EINVAL; 408 409 usb_unlock_device(udev); 410 return rc; 411 } 412 413 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level); 414 415 static struct attribute *power_attrs[] = { 416 &dev_attr_autosuspend.attr, 417 &dev_attr_level.attr, 418 &dev_attr_connected_duration.attr, 419 &dev_attr_active_duration.attr, 420 NULL, 421 }; 422 static struct attribute_group power_attr_group = { 423 .name = power_group_name, 424 .attrs = power_attrs, 425 }; 426 427 static int add_power_attributes(struct device *dev) 428 { 429 int rc = 0; 430 431 if (is_usb_device(dev)) 432 rc = sysfs_merge_group(&dev->kobj, &power_attr_group); 433 return rc; 434 } 435 436 static void remove_power_attributes(struct device *dev) 437 { 438 sysfs_unmerge_group(&dev->kobj, &power_attr_group); 439 } 440 441 #else 442 443 #define add_power_attributes(dev) 0 444 #define remove_power_attributes(dev) do {} while (0) 445 446 #endif /* CONFIG_USB_SUSPEND */ 447 448 449 /* Descriptor fields */ 450 #define usb_descriptor_attr_le16(field, format_string) \ 451 static ssize_t \ 452 show_##field(struct device *dev, struct device_attribute *attr, \ 453 char *buf) \ 454 { \ 455 struct usb_device *udev; \ 456 \ 457 udev = to_usb_device(dev); \ 458 return sprintf(buf, format_string, \ 459 le16_to_cpu(udev->descriptor.field)); \ 460 } \ 461 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 462 463 usb_descriptor_attr_le16(idVendor, "%04x\n") 464 usb_descriptor_attr_le16(idProduct, "%04x\n") 465 usb_descriptor_attr_le16(bcdDevice, "%04x\n") 466 467 #define usb_descriptor_attr(field, format_string) \ 468 static ssize_t \ 469 show_##field(struct device *dev, struct device_attribute *attr, \ 470 char *buf) \ 471 { \ 472 struct usb_device *udev; \ 473 \ 474 udev = to_usb_device(dev); \ 475 return sprintf(buf, format_string, udev->descriptor.field); \ 476 } \ 477 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 478 479 usb_descriptor_attr(bDeviceClass, "%02x\n") 480 usb_descriptor_attr(bDeviceSubClass, "%02x\n") 481 usb_descriptor_attr(bDeviceProtocol, "%02x\n") 482 usb_descriptor_attr(bNumConfigurations, "%d\n") 483 usb_descriptor_attr(bMaxPacketSize0, "%d\n") 484 485 486 487 /* show if the device is authorized (1) or not (0) */ 488 static ssize_t usb_dev_authorized_show(struct device *dev, 489 struct device_attribute *attr, 490 char *buf) 491 { 492 struct usb_device *usb_dev = to_usb_device(dev); 493 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized); 494 } 495 496 497 /* 498 * Authorize a device to be used in the system 499 * 500 * Writing a 0 deauthorizes the device, writing a 1 authorizes it. 501 */ 502 static ssize_t usb_dev_authorized_store(struct device *dev, 503 struct device_attribute *attr, 504 const char *buf, size_t size) 505 { 506 ssize_t result; 507 struct usb_device *usb_dev = to_usb_device(dev); 508 unsigned val; 509 result = sscanf(buf, "%u\n", &val); 510 if (result != 1) 511 result = -EINVAL; 512 else if (val == 0) 513 result = usb_deauthorize_device(usb_dev); 514 else 515 result = usb_authorize_device(usb_dev); 516 return result < 0? result : size; 517 } 518 519 static DEVICE_ATTR(authorized, 0644, 520 usb_dev_authorized_show, usb_dev_authorized_store); 521 522 /* "Safely remove a device" */ 523 static ssize_t usb_remove_store(struct device *dev, 524 struct device_attribute *attr, 525 const char *buf, size_t count) 526 { 527 struct usb_device *udev = to_usb_device(dev); 528 int rc = 0; 529 530 usb_lock_device(udev); 531 if (udev->state != USB_STATE_NOTATTACHED) { 532 533 /* To avoid races, first unconfigure and then remove */ 534 usb_set_configuration(udev, -1); 535 rc = usb_remove_device(udev); 536 } 537 if (rc == 0) 538 rc = count; 539 usb_unlock_device(udev); 540 return rc; 541 } 542 static DEVICE_ATTR(remove, 0200, NULL, usb_remove_store); 543 544 545 static struct attribute *dev_attrs[] = { 546 /* current configuration's attributes */ 547 &dev_attr_configuration.attr, 548 &dev_attr_bNumInterfaces.attr, 549 &dev_attr_bConfigurationValue.attr, 550 &dev_attr_bmAttributes.attr, 551 &dev_attr_bMaxPower.attr, 552 /* device attributes */ 553 &dev_attr_urbnum.attr, 554 &dev_attr_idVendor.attr, 555 &dev_attr_idProduct.attr, 556 &dev_attr_bcdDevice.attr, 557 &dev_attr_bDeviceClass.attr, 558 &dev_attr_bDeviceSubClass.attr, 559 &dev_attr_bDeviceProtocol.attr, 560 &dev_attr_bNumConfigurations.attr, 561 &dev_attr_bMaxPacketSize0.attr, 562 &dev_attr_speed.attr, 563 &dev_attr_busnum.attr, 564 &dev_attr_devnum.attr, 565 &dev_attr_devpath.attr, 566 &dev_attr_version.attr, 567 &dev_attr_maxchild.attr, 568 &dev_attr_quirks.attr, 569 &dev_attr_avoid_reset_quirk.attr, 570 &dev_attr_authorized.attr, 571 &dev_attr_remove.attr, 572 NULL, 573 }; 574 static struct attribute_group dev_attr_grp = { 575 .attrs = dev_attrs, 576 }; 577 578 /* When modifying this list, be sure to modify dev_string_attrs_are_visible() 579 * accordingly. 580 */ 581 static struct attribute *dev_string_attrs[] = { 582 &dev_attr_manufacturer.attr, 583 &dev_attr_product.attr, 584 &dev_attr_serial.attr, 585 NULL 586 }; 587 588 static mode_t dev_string_attrs_are_visible(struct kobject *kobj, 589 struct attribute *a, int n) 590 { 591 struct device *dev = container_of(kobj, struct device, kobj); 592 struct usb_device *udev = to_usb_device(dev); 593 594 if (a == &dev_attr_manufacturer.attr) { 595 if (udev->manufacturer == NULL) 596 return 0; 597 } else if (a == &dev_attr_product.attr) { 598 if (udev->product == NULL) 599 return 0; 600 } else if (a == &dev_attr_serial.attr) { 601 if (udev->serial == NULL) 602 return 0; 603 } 604 return a->mode; 605 } 606 607 static struct attribute_group dev_string_attr_grp = { 608 .attrs = dev_string_attrs, 609 .is_visible = dev_string_attrs_are_visible, 610 }; 611 612 const struct attribute_group *usb_device_groups[] = { 613 &dev_attr_grp, 614 &dev_string_attr_grp, 615 NULL 616 }; 617 618 /* Binary descriptors */ 619 620 static ssize_t 621 read_descriptors(struct file *filp, struct kobject *kobj, 622 struct bin_attribute *attr, 623 char *buf, loff_t off, size_t count) 624 { 625 struct device *dev = container_of(kobj, struct device, kobj); 626 struct usb_device *udev = to_usb_device(dev); 627 size_t nleft = count; 628 size_t srclen, n; 629 int cfgno; 630 void *src; 631 632 /* The binary attribute begins with the device descriptor. 633 * Following that are the raw descriptor entries for all the 634 * configurations (config plus subsidiary descriptors). 635 */ 636 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations && 637 nleft > 0; ++cfgno) { 638 if (cfgno < 0) { 639 src = &udev->descriptor; 640 srclen = sizeof(struct usb_device_descriptor); 641 } else { 642 src = udev->rawdescriptors[cfgno]; 643 srclen = __le16_to_cpu(udev->config[cfgno].desc. 644 wTotalLength); 645 } 646 if (off < srclen) { 647 n = min(nleft, srclen - (size_t) off); 648 memcpy(buf, src + off, n); 649 nleft -= n; 650 buf += n; 651 off = 0; 652 } else { 653 off -= srclen; 654 } 655 } 656 return count - nleft; 657 } 658 659 static struct bin_attribute dev_bin_attr_descriptors = { 660 .attr = {.name = "descriptors", .mode = 0444}, 661 .read = read_descriptors, 662 .size = 18 + 65535, /* dev descr + max-size raw descriptor */ 663 }; 664 665 int usb_create_sysfs_dev_files(struct usb_device *udev) 666 { 667 struct device *dev = &udev->dev; 668 int retval; 669 670 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors); 671 if (retval) 672 goto error; 673 674 retval = add_persist_attributes(dev); 675 if (retval) 676 goto error; 677 678 retval = add_power_attributes(dev); 679 if (retval) 680 goto error; 681 return retval; 682 error: 683 usb_remove_sysfs_dev_files(udev); 684 return retval; 685 } 686 687 void usb_remove_sysfs_dev_files(struct usb_device *udev) 688 { 689 struct device *dev = &udev->dev; 690 691 remove_power_attributes(dev); 692 remove_persist_attributes(dev); 693 device_remove_bin_file(dev, &dev_bin_attr_descriptors); 694 } 695 696 /* Interface Accociation Descriptor fields */ 697 #define usb_intf_assoc_attr(field, format_string) \ 698 static ssize_t \ 699 show_iad_##field(struct device *dev, struct device_attribute *attr, \ 700 char *buf) \ 701 { \ 702 struct usb_interface *intf = to_usb_interface(dev); \ 703 \ 704 return sprintf(buf, format_string, \ 705 intf->intf_assoc->field); \ 706 } \ 707 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL); 708 709 usb_intf_assoc_attr(bFirstInterface, "%02x\n") 710 usb_intf_assoc_attr(bInterfaceCount, "%02d\n") 711 usb_intf_assoc_attr(bFunctionClass, "%02x\n") 712 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n") 713 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n") 714 715 /* Interface fields */ 716 #define usb_intf_attr(field, format_string) \ 717 static ssize_t \ 718 show_##field(struct device *dev, struct device_attribute *attr, \ 719 char *buf) \ 720 { \ 721 struct usb_interface *intf = to_usb_interface(dev); \ 722 \ 723 return sprintf(buf, format_string, \ 724 intf->cur_altsetting->desc.field); \ 725 } \ 726 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 727 728 usb_intf_attr(bInterfaceNumber, "%02x\n") 729 usb_intf_attr(bAlternateSetting, "%2d\n") 730 usb_intf_attr(bNumEndpoints, "%02x\n") 731 usb_intf_attr(bInterfaceClass, "%02x\n") 732 usb_intf_attr(bInterfaceSubClass, "%02x\n") 733 usb_intf_attr(bInterfaceProtocol, "%02x\n") 734 735 static ssize_t show_interface_string(struct device *dev, 736 struct device_attribute *attr, char *buf) 737 { 738 struct usb_interface *intf; 739 char *string; 740 741 intf = to_usb_interface(dev); 742 string = intf->cur_altsetting->string; 743 barrier(); /* The altsetting might change! */ 744 745 if (!string) 746 return 0; 747 return sprintf(buf, "%s\n", string); 748 } 749 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL); 750 751 static ssize_t show_modalias(struct device *dev, 752 struct device_attribute *attr, char *buf) 753 { 754 struct usb_interface *intf; 755 struct usb_device *udev; 756 struct usb_host_interface *alt; 757 758 intf = to_usb_interface(dev); 759 udev = interface_to_usbdev(intf); 760 alt = intf->cur_altsetting; 761 762 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X" 763 "ic%02Xisc%02Xip%02X\n", 764 le16_to_cpu(udev->descriptor.idVendor), 765 le16_to_cpu(udev->descriptor.idProduct), 766 le16_to_cpu(udev->descriptor.bcdDevice), 767 udev->descriptor.bDeviceClass, 768 udev->descriptor.bDeviceSubClass, 769 udev->descriptor.bDeviceProtocol, 770 alt->desc.bInterfaceClass, 771 alt->desc.bInterfaceSubClass, 772 alt->desc.bInterfaceProtocol); 773 } 774 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); 775 776 static ssize_t show_supports_autosuspend(struct device *dev, 777 struct device_attribute *attr, char *buf) 778 { 779 struct usb_interface *intf; 780 struct usb_device *udev; 781 int ret; 782 783 intf = to_usb_interface(dev); 784 udev = interface_to_usbdev(intf); 785 786 usb_lock_device(udev); 787 /* Devices will be autosuspended even when an interface isn't claimed */ 788 if (!intf->dev.driver || 789 to_usb_driver(intf->dev.driver)->supports_autosuspend) 790 ret = sprintf(buf, "%u\n", 1); 791 else 792 ret = sprintf(buf, "%u\n", 0); 793 usb_unlock_device(udev); 794 795 return ret; 796 } 797 static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL); 798 799 static struct attribute *intf_attrs[] = { 800 &dev_attr_bInterfaceNumber.attr, 801 &dev_attr_bAlternateSetting.attr, 802 &dev_attr_bNumEndpoints.attr, 803 &dev_attr_bInterfaceClass.attr, 804 &dev_attr_bInterfaceSubClass.attr, 805 &dev_attr_bInterfaceProtocol.attr, 806 &dev_attr_modalias.attr, 807 &dev_attr_supports_autosuspend.attr, 808 NULL, 809 }; 810 static struct attribute_group intf_attr_grp = { 811 .attrs = intf_attrs, 812 }; 813 814 static struct attribute *intf_assoc_attrs[] = { 815 &dev_attr_iad_bFirstInterface.attr, 816 &dev_attr_iad_bInterfaceCount.attr, 817 &dev_attr_iad_bFunctionClass.attr, 818 &dev_attr_iad_bFunctionSubClass.attr, 819 &dev_attr_iad_bFunctionProtocol.attr, 820 NULL, 821 }; 822 823 static mode_t intf_assoc_attrs_are_visible(struct kobject *kobj, 824 struct attribute *a, int n) 825 { 826 struct device *dev = container_of(kobj, struct device, kobj); 827 struct usb_interface *intf = to_usb_interface(dev); 828 829 if (intf->intf_assoc == NULL) 830 return 0; 831 return a->mode; 832 } 833 834 static struct attribute_group intf_assoc_attr_grp = { 835 .attrs = intf_assoc_attrs, 836 .is_visible = intf_assoc_attrs_are_visible, 837 }; 838 839 const struct attribute_group *usb_interface_groups[] = { 840 &intf_attr_grp, 841 &intf_assoc_attr_grp, 842 NULL 843 }; 844 845 int usb_create_sysfs_intf_files(struct usb_interface *intf) 846 { 847 struct usb_device *udev = interface_to_usbdev(intf); 848 struct usb_host_interface *alt = intf->cur_altsetting; 849 int retval; 850 851 if (intf->sysfs_files_created || intf->unregistering) 852 return 0; 853 854 if (alt->string == NULL && 855 !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS)) 856 alt->string = usb_cache_string(udev, alt->desc.iInterface); 857 if (alt->string) 858 retval = device_create_file(&intf->dev, &dev_attr_interface); 859 intf->sysfs_files_created = 1; 860 return 0; 861 } 862 863 void usb_remove_sysfs_intf_files(struct usb_interface *intf) 864 { 865 if (!intf->sysfs_files_created) 866 return; 867 868 device_remove_file(&intf->dev, &dev_attr_interface); 869 intf->sysfs_files_created = 0; 870 } 871