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_VARIABLE:
 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 const char power_group[] = "power";
 237
 238 static ssize_t
 239 show_persist(struct device *dev, struct device_attribute *attr, char *buf)
 240 {
 241         struct usb_device *udev = to_usb_device(dev);
 242
 243         return sprintf(buf, "%d\n", udev->persist_enabled);
 244 }
 245
 246 static ssize_t
 247 set_persist(struct device *dev, struct device_attribute *attr,
 248                 const char *buf, size_t count)
 249 {
 250         struct usb_device *udev = to_usb_device(dev);
 251         int value;
 252
 253         /* Hubs are always enabled for USB_PERSIST */
 254         if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
 255                 return -EPERM;
 256
 257         if (sscanf(buf, "%d", &value) != 1)
 258                 return -EINVAL;
 259         usb_pm_lock(udev);
 260         udev->persist_enabled = !!value;
 261         usb_pm_unlock(udev);
 262         return count;
 263 }
 264
 265 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
 266
 267 static int add_persist_attributes(struct device *dev)
 268 {
 269         int rc = 0;
 270
 271         if (is_usb_device(dev)) {
 272                 struct usb_device *udev = to_usb_device(dev);
 273
 274                 /* Hubs are automatically enabled for USB_PERSIST,
 275                  * no point in creating the attribute file.
 276                  */
 277                 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
 278                         rc = sysfs_add_file_to_group(&dev->kobj,
 279                                         &dev_attr_persist.attr,
 280                                         power_group);
 281         }
 282         return rc;
 283 }
 284
 285 static void remove_persist_attributes(struct device *dev)
 286 {
 287         sysfs_remove_file_from_group(&dev->kobj,
 288                         &dev_attr_persist.attr,
 289                         power_group);
 290 }
 291 #else
 292
 293 #define add_persist_attributes(dev)     0
 294 #define remove_persist_attributes(dev)  do {} while (0)
 295
 296 #endif  /* CONFIG_PM */
 297
 298 #ifdef  CONFIG_USB_SUSPEND
 299
 300 static ssize_t
 301 show_connected_duration(struct device *dev, struct device_attribute *attr,
 302                 char *buf)
 303 {
 304         struct usb_device *udev = to_usb_device(dev);
 305
 306         return sprintf(buf, "%u\n",
 307                         jiffies_to_msecs(jiffies - udev->connect_time));
 308 }
 309
 310 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
 311
 312 /*
 313  * If the device is resumed, the last time the device was suspended has
 314  * been pre-subtracted from active_duration.  We add the current time to
 315  * get the duration that the device was actually active.
 316  *
 317  * If the device is suspended, the active_duration is up-to-date.
 318  */
 319 static ssize_t
 320 show_active_duration(struct device *dev, struct device_attribute *attr,
 321                 char *buf)
 322 {
 323         struct usb_device *udev = to_usb_device(dev);
 324         int duration;
 325
 326         if (udev->state != USB_STATE_SUSPENDED)
 327                 duration = jiffies_to_msecs(jiffies + udev->active_duration);
 328         else
 329                 duration = jiffies_to_msecs(udev->active_duration);
 330         return sprintf(buf, "%u\n", duration);
 331 }
 332
 333 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
 334
 335 static ssize_t
 336 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
 337 {
 338         struct usb_device *udev = to_usb_device(dev);
 339
 340         return sprintf(buf, "%d\n", udev->autosuspend_delay / HZ);
 341 }
 342
 343 static ssize_t
 344 set_autosuspend(struct device *dev, struct device_attribute *attr,
 345                 const char *buf, size_t count)
 346 {
 347         struct usb_device *udev = to_usb_device(dev);
 348         int value;
 349
 350         if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/HZ ||
 351                         value <= - INT_MAX/HZ)
 352                 return -EINVAL;
 353         value *= HZ;
 354
 355         udev->autosuspend_delay = value;
 356         if (value >= 0)
 357                 usb_try_autosuspend_device(udev);
 358         else {
 359                 if (usb_autoresume_device(udev) == 0)
 360                         usb_autosuspend_device(udev);
 361         }
 362         return count;
 363 }
 364
 365 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
 366                 show_autosuspend, set_autosuspend);
 367
 368 static const char on_string[] = "on";
 369 static const char auto_string[] = "auto";
 370
 371 static ssize_t
 372 show_level(struct device *dev, struct device_attribute *attr, char *buf)
 373 {
 374         struct usb_device *udev = to_usb_device(dev);
 375         const char *p = auto_string;
 376
 377         if (udev->state != USB_STATE_SUSPENDED && udev->autosuspend_disabled)
 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 = 0;
 390         int old_autosuspend_disabled;
 391
 392         cp = memchr(buf, '\n', count);
 393         if (cp)
 394                 len = cp - buf;
 395
 396         usb_lock_device(udev);
 397         old_autosuspend_disabled = udev->autosuspend_disabled;
 398
 399         /* Setting the flags without calling usb_pm_lock is a subject to
 400          * races, but who cares...
 401          */
 402         if (len == sizeof on_string - 1 &&
 403                         strncmp(buf, on_string, len) == 0) {
 404                 udev->autosuspend_disabled = 1;
 405                 rc = usb_external_resume_device(udev, PMSG_USER_RESUME);
 406
 407         } else if (len == sizeof auto_string - 1 &&
 408                         strncmp(buf, auto_string, len) == 0) {
 409                 udev->autosuspend_disabled = 0;
 410                 rc = usb_external_resume_device(udev, PMSG_USER_RESUME);
 411
 412         } else
 413                 rc = -EINVAL;
 414
 415         if (rc)
 416                 udev->autosuspend_disabled = old_autosuspend_disabled;
 417         usb_unlock_device(udev);
 418         return (rc < 0 ? rc : count);
 419 }
 420
 421 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
 422
 423 static int add_power_attributes(struct device *dev)
 424 {
 425         int rc = 0;
 426
 427         if (is_usb_device(dev)) {
 428                 rc = sysfs_add_file_to_group(&dev->kobj,
 429                                 &dev_attr_autosuspend.attr,
 430                                 power_group);
 431                 if (rc == 0)
 432                         rc = sysfs_add_file_to_group(&dev->kobj,
 433                                         &dev_attr_level.attr,
 434                                         power_group);
 435                 if (rc == 0)
 436                         rc = sysfs_add_file_to_group(&dev->kobj,
 437                                         &dev_attr_connected_duration.attr,
 438                                         power_group);
 439                 if (rc == 0)
 440                         rc = sysfs_add_file_to_group(&dev->kobj,
 441                                         &dev_attr_active_duration.attr,
 442                                         power_group);
 443         }
 444         return rc;
 445 }
 446
 447 static void remove_power_attributes(struct device *dev)
 448 {
 449         sysfs_remove_file_from_group(&dev->kobj,
 450                         &dev_attr_active_duration.attr,
 451                         power_group);
 452         sysfs_remove_file_from_group(&dev->kobj,
 453                         &dev_attr_connected_duration.attr,
 454                         power_group);
 455         sysfs_remove_file_from_group(&dev->kobj,
 456                         &dev_attr_level.attr,
 457                         power_group);
 458         sysfs_remove_file_from_group(&dev->kobj,
 459                         &dev_attr_autosuspend.attr,
 460                         power_group);
 461 }
 462
 463 #else
 464
 465 #define add_power_attributes(dev)       0
 466 #define remove_power_attributes(dev)    do {} while (0)
 467
 468 #endif  /* CONFIG_USB_SUSPEND */
 469
 470
 471 /* Descriptor fields */
 472 #define usb_descriptor_attr_le16(field, format_string)                  \
 473 static ssize_t                                                          \
 474 show_##field(struct device *dev, struct device_attribute *attr, \
 475                 char *buf)                                              \
 476 {                                                                       \
 477         struct usb_device *udev;                                        \
 478                                                                         \
 479         udev = to_usb_device(dev);                                      \
 480         return sprintf(buf, format_string,                              \
 481                         le16_to_cpu(udev->descriptor.field));           \
 482 }                                                                       \
 483 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 484
 485 usb_descriptor_attr_le16(idVendor, "%04x\n")
 486 usb_descriptor_attr_le16(idProduct, "%04x\n")
 487 usb_descriptor_attr_le16(bcdDevice, "%04x\n")
 488
 489 #define usb_descriptor_attr(field, format_string)                       \
 490 static ssize_t                                                          \
 491 show_##field(struct device *dev, struct device_attribute *attr, \
 492                 char *buf)                                              \
 493 {                                                                       \
 494         struct usb_device *udev;                                        \
 495                                                                         \
 496         udev = to_usb_device(dev);                                      \
 497         return sprintf(buf, format_string, udev->descriptor.field);     \
 498 }                                                                       \
 499 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 500
 501 usb_descriptor_attr(bDeviceClass, "%02x\n")
 502 usb_descriptor_attr(bDeviceSubClass, "%02x\n")
 503 usb_descriptor_attr(bDeviceProtocol, "%02x\n")
 504 usb_descriptor_attr(bNumConfigurations, "%d\n")
 505 usb_descriptor_attr(bMaxPacketSize0, "%d\n")
 506
 507
 508
 509 /* show if the device is authorized (1) or not (0) */
 510 static ssize_t usb_dev_authorized_show(struct device *dev,
 511                                        struct device_attribute *attr,
 512                                        char *buf)
 513 {
 514         struct usb_device *usb_dev = to_usb_device(dev);
 515         return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
 516 }
 517
 518
 519 /*
 520  * Authorize a device to be used in the system
 521  *
 522  * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
 523  */
 524 static ssize_t usb_dev_authorized_store(struct device *dev,
 525                                         struct device_attribute *attr,
 526                                         const char *buf, size_t size)
 527 {
 528         ssize_t result;
 529         struct usb_device *usb_dev = to_usb_device(dev);
 530         unsigned val;
 531         result = sscanf(buf, "%u\n", &val);
 532         if (result != 1)
 533                 result = -EINVAL;
 534         else if (val == 0)
 535                 result = usb_deauthorize_device(usb_dev);
 536         else
 537                 result = usb_authorize_device(usb_dev);
 538         return result < 0? result : size;
 539 }
 540
 541 static DEVICE_ATTR(authorized, 0644,
 542             usb_dev_authorized_show, usb_dev_authorized_store);
 543
 544 /* "Safely remove a device" */
 545 static ssize_t usb_remove_store(struct device *dev,
 546                 struct device_attribute *attr,
 547                 const char *buf, size_t count)
 548 {
 549         struct usb_device *udev = to_usb_device(dev);
 550         int rc = 0;
 551
 552         usb_lock_device(udev);
 553         if (udev->state != USB_STATE_NOTATTACHED) {
 554
 555                 /* To avoid races, first unconfigure and then remove */
 556                 usb_set_configuration(udev, -1);
 557                 rc = usb_remove_device(udev);
 558         }
 559         if (rc == 0)
 560                 rc = count;
 561         usb_unlock_device(udev);
 562         return rc;
 563 }
 564 static DEVICE_ATTR(remove, 0200, NULL, usb_remove_store);
 565
 566
 567 static struct attribute *dev_attrs[] = {
 568         /* current configuration's attributes */
 569         &dev_attr_configuration.attr,
 570         &dev_attr_bNumInterfaces.attr,
 571         &dev_attr_bConfigurationValue.attr,
 572         &dev_attr_bmAttributes.attr,
 573         &dev_attr_bMaxPower.attr,
 574         /* device attributes */
 575         &dev_attr_urbnum.attr,
 576         &dev_attr_idVendor.attr,
 577         &dev_attr_idProduct.attr,
 578         &dev_attr_bcdDevice.attr,
 579         &dev_attr_bDeviceClass.attr,
 580         &dev_attr_bDeviceSubClass.attr,
 581         &dev_attr_bDeviceProtocol.attr,
 582         &dev_attr_bNumConfigurations.attr,
 583         &dev_attr_bMaxPacketSize0.attr,
 584         &dev_attr_speed.attr,
 585         &dev_attr_busnum.attr,
 586         &dev_attr_devnum.attr,
 587         &dev_attr_devpath.attr,
 588         &dev_attr_version.attr,
 589         &dev_attr_maxchild.attr,
 590         &dev_attr_quirks.attr,
 591         &dev_attr_avoid_reset_quirk.attr,
 592         &dev_attr_authorized.attr,
 593         &dev_attr_remove.attr,
 594         NULL,
 595 };
 596 static struct attribute_group dev_attr_grp = {
 597         .attrs = dev_attrs,
 598 };
 599
 600 /* When modifying this list, be sure to modify dev_string_attrs_are_visible()
 601  * accordingly.
 602  */
 603 static struct attribute *dev_string_attrs[] = {
 604         &dev_attr_manufacturer.attr,
 605         &dev_attr_product.attr,
 606         &dev_attr_serial.attr,
 607         NULL
 608 };
 609
 610 static mode_t dev_string_attrs_are_visible(struct kobject *kobj,
 611                 struct attribute *a, int n)
 612 {
 613         struct device *dev = container_of(kobj, struct device, kobj);
 614         struct usb_device *udev = to_usb_device(dev);
 615
 616         if (a == &dev_attr_manufacturer.attr) {
 617                 if (udev->manufacturer == NULL)
 618                         return 0;
 619         } else if (a == &dev_attr_product.attr) {
 620                 if (udev->product == NULL)
 621                         return 0;
 622         } else if (a == &dev_attr_serial.attr) {
 623                 if (udev->serial == NULL)
 624                         return 0;
 625         }
 626         return a->mode;
 627 }
 628
 629 static struct attribute_group dev_string_attr_grp = {
 630         .attrs =        dev_string_attrs,
 631         .is_visible =   dev_string_attrs_are_visible,
 632 };
 633
 634 const struct attribute_group *usb_device_groups[] = {
 635         &dev_attr_grp,
 636         &dev_string_attr_grp,
 637         NULL
 638 };
 639
 640 /* Binary descriptors */
 641
 642 static ssize_t
 643 read_descriptors(struct kobject *kobj, struct bin_attribute *attr,
 644                 char *buf, loff_t off, size_t count)
 645 {
 646         struct device *dev = container_of(kobj, struct device, kobj);
 647         struct usb_device *udev = to_usb_device(dev);
 648         size_t nleft = count;
 649         size_t srclen, n;
 650         int cfgno;
 651         void *src;
 652
 653         /* The binary attribute begins with the device descriptor.
 654          * Following that are the raw descriptor entries for all the
 655          * configurations (config plus subsidiary descriptors).
 656          */
 657         for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
 658                         nleft > 0; ++cfgno) {
 659                 if (cfgno < 0) {
 660                         src = &udev->descriptor;
 661                         srclen = sizeof(struct usb_device_descriptor);
 662                 } else {
 663                         src = udev->rawdescriptors[cfgno];
 664                         srclen = __le16_to_cpu(udev->config[cfgno].desc.
 665                                         wTotalLength);
 666                 }
 667                 if (off < srclen) {
 668                         n = min(nleft, srclen - (size_t) off);
 669                         memcpy(buf, src + off, n);
 670                         nleft -= n;
 671                         buf += n;
 672                         off = 0;
 673                 } else {
 674                         off -= srclen;
 675                 }
 676         }
 677         return count - nleft;
 678 }
 679
 680 static struct bin_attribute dev_bin_attr_descriptors = {
 681         .attr = {.name = "descriptors", .mode = 0444},
 682         .read = read_descriptors,
 683         .size = 18 + 65535,     /* dev descr + max-size raw descriptor */
 684 };
 685
 686 int usb_create_sysfs_dev_files(struct usb_device *udev)
 687 {
 688         struct device *dev = &udev->dev;
 689         int retval;
 690
 691         retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
 692         if (retval)
 693                 goto error;
 694
 695         retval = add_persist_attributes(dev);
 696         if (retval)
 697                 goto error;
 698
 699         retval = add_power_attributes(dev);
 700         if (retval)
 701                 goto error;
 702         return retval;
 703 error:
 704         usb_remove_sysfs_dev_files(udev);
 705         return retval;
 706 }
 707
 708 void usb_remove_sysfs_dev_files(struct usb_device *udev)
 709 {
 710         struct device *dev = &udev->dev;
 711
 712         remove_power_attributes(dev);
 713         remove_persist_attributes(dev);
 714         device_remove_bin_file(dev, &dev_bin_attr_descriptors);
 715 }
 716
 717 /* Interface Accociation Descriptor fields */
 718 #define usb_intf_assoc_attr(field, format_string)                       \
 719 static ssize_t                                                          \
 720 show_iad_##field(struct device *dev, struct device_attribute *attr,     \
 721                 char *buf)                                              \
 722 {                                                                       \
 723         struct usb_interface *intf = to_usb_interface(dev);             \
 724                                                                         \
 725         return sprintf(buf, format_string,                              \
 726                         intf->intf_assoc->field);                       \
 727 }                                                                       \
 728 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
 729
 730 usb_intf_assoc_attr(bFirstInterface, "%02x\n")
 731 usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
 732 usb_intf_assoc_attr(bFunctionClass, "%02x\n")
 733 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
 734 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
 735
 736 /* Interface fields */
 737 #define usb_intf_attr(field, format_string)                             \
 738 static ssize_t                                                          \
 739 show_##field(struct device *dev, struct device_attribute *attr, \
 740                 char *buf)                                              \
 741 {                                                                       \
 742         struct usb_interface *intf = to_usb_interface(dev);             \
 743                                                                         \
 744         return sprintf(buf, format_string,                              \
 745                         intf->cur_altsetting->desc.field);              \
 746 }                                                                       \
 747 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 748
 749 usb_intf_attr(bInterfaceNumber, "%02x\n")
 750 usb_intf_attr(bAlternateSetting, "%2d\n")
 751 usb_intf_attr(bNumEndpoints, "%02x\n")
 752 usb_intf_attr(bInterfaceClass, "%02x\n")
 753 usb_intf_attr(bInterfaceSubClass, "%02x\n")
 754 usb_intf_attr(bInterfaceProtocol, "%02x\n")
 755
 756 static ssize_t show_interface_string(struct device *dev,
 757                 struct device_attribute *attr, char *buf)
 758 {
 759         struct usb_interface *intf;
 760         char *string;
 761
 762         intf = to_usb_interface(dev);
 763         string = intf->cur_altsetting->string;
 764         barrier();              /* The altsetting might change! */
 765
 766         if (!string)
 767                 return 0;
 768         return sprintf(buf, "%s\n", string);
 769 }
 770 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
 771
 772 static ssize_t show_modalias(struct device *dev,
 773                 struct device_attribute *attr, char *buf)
 774 {
 775         struct usb_interface *intf;
 776         struct usb_device *udev;
 777         struct usb_host_interface *alt;
 778
 779         intf = to_usb_interface(dev);
 780         udev = interface_to_usbdev(intf);
 781         alt = intf->cur_altsetting;
 782
 783         return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
 784                         "ic%02Xisc%02Xip%02X\n",
 785                         le16_to_cpu(udev->descriptor.idVendor),
 786                         le16_to_cpu(udev->descriptor.idProduct),
 787                         le16_to_cpu(udev->descriptor.bcdDevice),
 788                         udev->descriptor.bDeviceClass,
 789                         udev->descriptor.bDeviceSubClass,
 790                         udev->descriptor.bDeviceProtocol,
 791                         alt->desc.bInterfaceClass,
 792                         alt->desc.bInterfaceSubClass,
 793                         alt->desc.bInterfaceProtocol);
 794 }
 795 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
 796
 797 static ssize_t show_supports_autosuspend(struct device *dev,
 798                 struct device_attribute *attr, char *buf)
 799 {
 800         struct usb_interface *intf;
 801         struct usb_device *udev;
 802         int ret;
 803
 804         intf = to_usb_interface(dev);
 805         udev = interface_to_usbdev(intf);
 806
 807         usb_lock_device(udev);
 808         /* Devices will be autosuspended even when an interface isn't claimed */
 809         if (!intf->dev.driver ||
 810                         to_usb_driver(intf->dev.driver)->supports_autosuspend)
 811                 ret = sprintf(buf, "%u\n", 1);
 812         else
 813                 ret = sprintf(buf, "%u\n", 0);
 814         usb_unlock_device(udev);
 815
 816         return ret;
 817 }
 818 static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
 819
 820 static struct attribute *intf_attrs[] = {
 821         &dev_attr_bInterfaceNumber.attr,
 822         &dev_attr_bAlternateSetting.attr,
 823         &dev_attr_bNumEndpoints.attr,
 824         &dev_attr_bInterfaceClass.attr,
 825         &dev_attr_bInterfaceSubClass.attr,
 826         &dev_attr_bInterfaceProtocol.attr,
 827         &dev_attr_modalias.attr,
 828         &dev_attr_supports_autosuspend.attr,
 829         NULL,
 830 };
 831 static struct attribute_group intf_attr_grp = {
 832         .attrs = intf_attrs,
 833 };
 834
 835 static struct attribute *intf_assoc_attrs[] = {
 836         &dev_attr_iad_bFirstInterface.attr,
 837         &dev_attr_iad_bInterfaceCount.attr,
 838         &dev_attr_iad_bFunctionClass.attr,
 839         &dev_attr_iad_bFunctionSubClass.attr,
 840         &dev_attr_iad_bFunctionProtocol.attr,
 841         NULL,
 842 };
 843
 844 static mode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
 845                 struct attribute *a, int n)
 846 {
 847         struct device *dev = container_of(kobj, struct device, kobj);
 848         struct usb_interface *intf = to_usb_interface(dev);
 849
 850         if (intf->intf_assoc == NULL)
 851                 return 0;
 852         return a->mode;
 853 }
 854
 855 static struct attribute_group intf_assoc_attr_grp = {
 856         .attrs =        intf_assoc_attrs,
 857         .is_visible =   intf_assoc_attrs_are_visible,
 858 };
 859
 860 const struct attribute_group *usb_interface_groups[] = {
 861         &intf_attr_grp,
 862         &intf_assoc_attr_grp,
 863         NULL
 864 };
 865
 866 int usb_create_sysfs_intf_files(struct usb_interface *intf)
 867 {
 868         struct usb_device *udev = interface_to_usbdev(intf);
 869         struct usb_host_interface *alt = intf->cur_altsetting;
 870         int retval;
 871
 872         if (intf->sysfs_files_created || intf->unregistering)
 873                 return 0;
 874
 875         if (alt->string == NULL &&
 876                         !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
 877                 alt->string = usb_cache_string(udev, alt->desc.iInterface);
 878         if (alt->string)
 879                 retval = device_create_file(&intf->dev, &dev_attr_interface);
 880         intf->sysfs_files_created = 1;
 881         return 0;
 882 }
 883
 884 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
 885 {
 886         if (!intf->sysfs_files_created)
 887                 return;
 888
 889         device_remove_file(&intf->dev, &dev_attr_interface);
 890         intf->sysfs_files_created = 0;
 891 }