drivers/usb/core/sysfs.c

   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 }