release/src-rt-6.x.4708/linux/linux-2.6.36/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 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
 260         usb_lock_device(udev);
 261         udev->persist_enabled = !!value;
 262         usb_unlock_device(udev);
 263         return count;
 264 }
 265
 266 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
 267
 268 static int add_persist_attributes(struct device *dev)
 269 {
 270         int rc = 0;
 271
 272         if (is_usb_device(dev)) {
 273                 struct usb_device *udev = to_usb_device(dev);
 274
 275                 /* Hubs are automatically enabled for USB_PERSIST,
 276                  * no point in creating the attribute file.
 277                  */
 278                 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
 279                         rc = sysfs_add_file_to_group(&dev->kobj,
 280                                         &dev_attr_persist.attr,
 281                                         power_group);
 282         }
 283         return rc;
 284 }
 285
 286 static void remove_persist_attributes(struct device *dev)
 287 {
 288         sysfs_remove_file_from_group(&dev->kobj,
 289                         &dev_attr_persist.attr,
 290                         power_group);
 291 }
 292 #else
 293
 294 #define add_persist_attributes(dev)     0
 295 #define remove_persist_attributes(dev)  do {} while (0)
 296
 297 #endif  /* CONFIG_PM */
 298
 299 #ifdef  CONFIG_USB_SUSPEND
 300
 301 static ssize_t
 302 show_connected_duration(struct device *dev, struct device_attribute *attr,
 303                 char *buf)
 304 {
 305         struct usb_device *udev = to_usb_device(dev);
 306
 307         return sprintf(buf, "%u\n",
 308                         jiffies_to_msecs(jiffies - udev->connect_time));
 309 }
 310
 311 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
 312
 313 /*
 314  * If the device is resumed, the last time the device was suspended has
 315  * been pre-subtracted from active_duration.  We add the current time to
 316  * get the duration that the device was actually active.
 317  *
 318  * If the device is suspended, the active_duration is up-to-date.
 319  */
 320 static ssize_t
 321 show_active_duration(struct device *dev, struct device_attribute *attr,
 322                 char *buf)
 323 {
 324         struct usb_device *udev = to_usb_device(dev);
 325         int duration;
 326
 327         if (udev->state != USB_STATE_SUSPENDED)
 328                 duration = jiffies_to_msecs(jiffies + udev->active_duration);
 329         else
 330                 duration = jiffies_to_msecs(udev->active_duration);
 331         return sprintf(buf, "%u\n", duration);
 332 }
 333
 334 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
 335
 336 static ssize_t
 337 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
 338 {
 339         struct usb_device *udev = to_usb_device(dev);
 340
 341         return sprintf(buf, "%d\n", udev->autosuspend_delay / HZ);
 342 }
 343
 344 static ssize_t
 345 set_autosuspend(struct device *dev, struct device_attribute *attr,
 346                 const char *buf, size_t count)
 347 {
 348         struct usb_device *udev = to_usb_device(dev);
 349         int value, old_delay;
 350         int rc;
 351
 352         if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/HZ ||
 353                         value <= - INT_MAX/HZ)
 354                 return -EINVAL;
 355         value *= HZ;
 356
 357         usb_lock_device(udev);
 358         old_delay = udev->autosuspend_delay;
 359         udev->autosuspend_delay = value;
 360
 361         if (old_delay < 0) {    /* Autosuspend wasn't allowed */
 362                 if (value >= 0)
 363                         usb_autosuspend_device(udev);
 364         } else {                /* Autosuspend was allowed */
 365                 if (value < 0) {
 366                         rc = usb_autoresume_device(udev);
 367                         if (rc < 0) {
 368                                 count = rc;
 369                                 udev->autosuspend_delay = old_delay;
 370                         }
 371                 } else {
 372                         usb_try_autosuspend_device(udev);
 373                 }
 374         }
 375
 376         usb_unlock_device(udev);
 377         return count;
 378 }
 379
 380 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
 381                 show_autosuspend, set_autosuspend);
 382
 383 static const char on_string[] = "on";
 384 static const char auto_string[] = "auto";
 385
 386 static void warn_level(void) {
 387         static int level_warned;
 388
 389         if (!level_warned) {
 390                 level_warned = 1;
 391                 printk(KERN_WARNING "WARNING! power/level is deprecated; "
 392                                 "use power/control instead\n");
 393         }
 394 }
 395
 396 static ssize_t
 397 show_level(struct device *dev, struct device_attribute *attr, char *buf)
 398 {
 399         struct usb_device *udev = to_usb_device(dev);
 400         const char *p = auto_string;
 401
 402         warn_level();
 403         if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
 404                 p = on_string;
 405         return sprintf(buf, "%s\n", p);
 406 }
 407
 408 static ssize_t
 409 set_level(struct device *dev, struct device_attribute *attr,
 410                 const char *buf, size_t count)
 411 {
 412         struct usb_device *udev = to_usb_device(dev);
 413         int len = count;
 414         char *cp;
 415         int rc = count;
 416
 417         warn_level();
 418         cp = memchr(buf, '\n', count);
 419         if (cp)
 420                 len = cp - buf;
 421
 422         usb_lock_device(udev);
 423
 424         if (len == sizeof on_string - 1 &&
 425                         strncmp(buf, on_string, len) == 0)
 426                 usb_disable_autosuspend(udev);
 427
 428         else if (len == sizeof auto_string - 1 &&
 429                         strncmp(buf, auto_string, len) == 0)
 430                 usb_enable_autosuspend(udev);
 431
 432         else
 433                 rc = -EINVAL;
 434
 435         usb_unlock_device(udev);
 436         return rc;
 437 }
 438
 439 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
 440
 441 static int add_power_attributes(struct device *dev)
 442 {
 443         int rc = 0;
 444
 445         if (is_usb_device(dev)) {
 446                 rc = sysfs_add_file_to_group(&dev->kobj,
 447                                 &dev_attr_autosuspend.attr,
 448                                 power_group);
 449                 if (rc == 0)
 450                         rc = sysfs_add_file_to_group(&dev->kobj,
 451                                         &dev_attr_level.attr,
 452                                         power_group);
 453                 if (rc == 0)
 454                         rc = sysfs_add_file_to_group(&dev->kobj,
 455                                         &dev_attr_connected_duration.attr,
 456                                         power_group);
 457                 if (rc == 0)
 458                         rc = sysfs_add_file_to_group(&dev->kobj,
 459                                         &dev_attr_active_duration.attr,
 460                                         power_group);
 461         }
 462         return rc;
 463 }
 464
 465 static void remove_power_attributes(struct device *dev)
 466 {
 467         sysfs_remove_file_from_group(&dev->kobj,
 468                         &dev_attr_active_duration.attr,
 469                         power_group);
 470         sysfs_remove_file_from_group(&dev->kobj,
 471                         &dev_attr_connected_duration.attr,
 472                         power_group);
 473         sysfs_remove_file_from_group(&dev->kobj,
 474                         &dev_attr_level.attr,
 475                         power_group);
 476         sysfs_remove_file_from_group(&dev->kobj,
 477                         &dev_attr_autosuspend.attr,
 478                         power_group);
 479 }
 480
 481 #else
 482
 483 #define add_power_attributes(dev)       0
 484 #define remove_power_attributes(dev)    do {} while (0)
 485
 486 #endif  /* CONFIG_USB_SUSPEND */
 487
 488
 489 /* Descriptor fields */
 490 #define usb_descriptor_attr_le16(field, format_string)                  \
 491 static ssize_t                                                          \
 492 show_##field(struct device *dev, struct device_attribute *attr, \
 493                 char *buf)                                              \
 494 {                                                                       \
 495         struct usb_device *udev;                                        \
 496                                                                         \
 497         udev = to_usb_device(dev);                                      \
 498         return sprintf(buf, format_string,                              \
 499                         le16_to_cpu(udev->descriptor.field));           \
 500 }                                                                       \
 501 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 502
 503 usb_descriptor_attr_le16(idVendor, "%04x\n")
 504 usb_descriptor_attr_le16(idProduct, "%04x\n")
 505 usb_descriptor_attr_le16(bcdDevice, "%04x\n")
 506
 507 #define usb_descriptor_attr(field, format_string)                       \
 508 static ssize_t                                                          \
 509 show_##field(struct device *dev, struct device_attribute *attr, \
 510                 char *buf)                                              \
 511 {                                                                       \
 512         struct usb_device *udev;                                        \
 513                                                                         \
 514         udev = to_usb_device(dev);                                      \
 515         return sprintf(buf, format_string, udev->descriptor.field);     \
 516 }                                                                       \
 517 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 518
 519 usb_descriptor_attr(bDeviceClass, "%02x\n")
 520 usb_descriptor_attr(bDeviceSubClass, "%02x\n")
 521 usb_descriptor_attr(bDeviceProtocol, "%02x\n")
 522 usb_descriptor_attr(bNumConfigurations, "%d\n")
 523 usb_descriptor_attr(bMaxPacketSize0, "%d\n")
 524
 525
 526
 527 /* show if the device is authorized (1) or not (0) */
 528 static ssize_t usb_dev_authorized_show(struct device *dev,
 529                                        struct device_attribute *attr,
 530                                        char *buf)
 531 {
 532         struct usb_device *usb_dev = to_usb_device(dev);
 533         return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
 534 }
 535
 536
 537 /*
 538  * Authorize a device to be used in the system
 539  *
 540  * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
 541  */
 542 static ssize_t usb_dev_authorized_store(struct device *dev,
 543                                         struct device_attribute *attr,
 544                                         const char *buf, size_t size)
 545 {
 546         ssize_t result;
 547         struct usb_device *usb_dev = to_usb_device(dev);
 548         unsigned val;
 549         result = sscanf(buf, "%u\n", &val);
 550         if (result != 1)
 551                 result = -EINVAL;
 552         else if (val == 0)
 553                 result = usb_deauthorize_device(usb_dev);
 554         else
 555                 result = usb_authorize_device(usb_dev);
 556         return result < 0? result : size;
 557 }
 558
 559 static DEVICE_ATTR(authorized, 0644,
 560             usb_dev_authorized_show, usb_dev_authorized_store);
 561
 562 /* "Safely remove a device" */
 563 static ssize_t usb_remove_store(struct device *dev,
 564                 struct device_attribute *attr,
 565                 const char *buf, size_t count)
 566 {
 567         struct usb_device *udev = to_usb_device(dev);
 568         int rc = 0;
 569
 570         usb_lock_device(udev);
 571         if (udev->state != USB_STATE_NOTATTACHED) {
 572
 573                 /* To avoid races, first unconfigure and then remove */
 574                 usb_set_configuration(udev, -1);
 575                 rc = usb_remove_device(udev);
 576         }
 577         if (rc == 0)
 578                 rc = count;
 579         usb_unlock_device(udev);
 580         return rc;
 581 }
 582 static DEVICE_ATTR(remove, 0200, NULL, usb_remove_store);
 583
 584
 585 static struct attribute *dev_attrs[] = {
 586         /* current configuration's attributes */
 587         &dev_attr_configuration.attr,
 588         &dev_attr_bNumInterfaces.attr,
 589         &dev_attr_bConfigurationValue.attr,
 590         &dev_attr_bmAttributes.attr,
 591         &dev_attr_bMaxPower.attr,
 592         /* device attributes */
 593         &dev_attr_urbnum.attr,
 594         &dev_attr_idVendor.attr,
 595         &dev_attr_idProduct.attr,
 596         &dev_attr_bcdDevice.attr,
 597         &dev_attr_bDeviceClass.attr,
 598         &dev_attr_bDeviceSubClass.attr,
 599         &dev_attr_bDeviceProtocol.attr,
 600         &dev_attr_bNumConfigurations.attr,
 601         &dev_attr_bMaxPacketSize0.attr,
 602         &dev_attr_speed.attr,
 603         &dev_attr_busnum.attr,
 604         &dev_attr_devnum.attr,
 605         &dev_attr_devpath.attr,
 606         &dev_attr_version.attr,
 607         &dev_attr_maxchild.attr,
 608         &dev_attr_quirks.attr,
 609         &dev_attr_avoid_reset_quirk.attr,
 610         &dev_attr_authorized.attr,
 611         &dev_attr_remove.attr,
 612         NULL,
 613 };
 614 static struct attribute_group dev_attr_grp = {
 615         .attrs = dev_attrs,
 616 };
 617
 618 /* When modifying this list, be sure to modify dev_string_attrs_are_visible()
 619  * accordingly.
 620  */
 621 static struct attribute *dev_string_attrs[] = {
 622         &dev_attr_manufacturer.attr,
 623         &dev_attr_product.attr,
 624         &dev_attr_serial.attr,
 625         NULL
 626 };
 627
 628 static mode_t dev_string_attrs_are_visible(struct kobject *kobj,
 629                 struct attribute *a, int n)
 630 {
 631         struct device *dev = container_of(kobj, struct device, kobj);
 632         struct usb_device *udev = to_usb_device(dev);
 633
 634         if (a == &dev_attr_manufacturer.attr) {
 635                 if (udev->manufacturer == NULL)
 636                         return 0;
 637         } else if (a == &dev_attr_product.attr) {
 638                 if (udev->product == NULL)
 639                         return 0;
 640         } else if (a == &dev_attr_serial.attr) {
 641                 if (udev->serial == NULL)
 642                         return 0;
 643         }
 644         return a->mode;
 645 }
 646
 647 static struct attribute_group dev_string_attr_grp = {
 648         .attrs =        dev_string_attrs,
 649         .is_visible =   dev_string_attrs_are_visible,
 650 };
 651
 652 const struct attribute_group *usb_device_groups[] = {
 653         &dev_attr_grp,
 654         &dev_string_attr_grp,
 655         NULL
 656 };
 657
 658 /* Binary descriptors */
 659
 660 static ssize_t
 661 read_descriptors(struct file *filp, struct kobject *kobj,
 662                 struct bin_attribute *attr,
 663                 char *buf, loff_t off, size_t count)
 664 {
 665         struct device *dev = container_of(kobj, struct device, kobj);
 666         struct usb_device *udev = to_usb_device(dev);
 667         size_t nleft = count;
 668         size_t srclen, n;
 669         int cfgno;
 670         void *src;
 671
 672         /* The binary attribute begins with the device descriptor.
 673          * Following that are the raw descriptor entries for all the
 674          * configurations (config plus subsidiary descriptors).
 675          */
 676         for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
 677                         nleft > 0; ++cfgno) {
 678                 if (cfgno < 0) {
 679                         src = &udev->descriptor;
 680                         srclen = sizeof(struct usb_device_descriptor);
 681                 } else {
 682                         src = udev->rawdescriptors[cfgno];
 683                         srclen = __le16_to_cpu(udev->config[cfgno].desc.
 684                                         wTotalLength);
 685                 }
 686                 if (off < srclen) {
 687                         n = min(nleft, srclen - (size_t) off);
 688                         memcpy(buf, src + off, n);
 689                         nleft -= n;
 690                         buf += n;
 691                         off = 0;
 692                 } else {
 693                         off -= srclen;
 694                 }
 695         }
 696         return count - nleft;
 697 }
 698
 699 static struct bin_attribute dev_bin_attr_descriptors = {
 700         .attr = {.name = "descriptors", .mode = 0444},
 701         .read = read_descriptors,
 702         .size = 18 + 65535,     /* dev descr + max-size raw descriptor */
 703 };
 704
 705 int usb_create_sysfs_dev_files(struct usb_device *udev)
 706 {
 707         struct device *dev = &udev->dev;
 708         int retval;
 709
 710         retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
 711         if (retval)
 712                 goto error;
 713
 714         retval = add_persist_attributes(dev);
 715         if (retval)
 716                 goto error;
 717
 718         retval = add_power_attributes(dev);
 719         if (retval)
 720                 goto error;
 721         return retval;
 722 error:
 723         usb_remove_sysfs_dev_files(udev);
 724         return retval;
 725 }
 726
 727 void usb_remove_sysfs_dev_files(struct usb_device *udev)
 728 {
 729         struct device *dev = &udev->dev;
 730
 731         remove_power_attributes(dev);
 732         remove_persist_attributes(dev);
 733         device_remove_bin_file(dev, &dev_bin_attr_descriptors);
 734 }
 735
 736 /* Interface Accociation Descriptor fields */
 737 #define usb_intf_assoc_attr(field, format_string)                       \
 738 static ssize_t                                                          \
 739 show_iad_##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->intf_assoc->field);                       \
 746 }                                                                       \
 747 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
 748
 749 usb_intf_assoc_attr(bFirstInterface, "%02x\n")
 750 usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
 751 usb_intf_assoc_attr(bFunctionClass, "%02x\n")
 752 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
 753 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
 754
 755 /* Interface fields */
 756 #define usb_intf_attr(field, format_string)                             \
 757 static ssize_t                                                          \
 758 show_##field(struct device *dev, struct device_attribute *attr, \
 759                 char *buf)                                              \
 760 {                                                                       \
 761         struct usb_interface *intf = to_usb_interface(dev);             \
 762                                                                         \
 763         return sprintf(buf, format_string,                              \
 764                         intf->cur_altsetting->desc.field);              \
 765 }                                                                       \
 766 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 767
 768 usb_intf_attr(bInterfaceNumber, "%02x\n")
 769 usb_intf_attr(bAlternateSetting, "%2d\n")
 770 usb_intf_attr(bNumEndpoints, "%02x\n")
 771 usb_intf_attr(bInterfaceClass, "%02x\n")
 772 usb_intf_attr(bInterfaceSubClass, "%02x\n")
 773 usb_intf_attr(bInterfaceProtocol, "%02x\n")
 774
 775 static ssize_t show_interface_string(struct device *dev,
 776                 struct device_attribute *attr, char *buf)
 777 {
 778         struct usb_interface *intf;
 779         char *string;
 780
 781         intf = to_usb_interface(dev);
 782         string = intf->cur_altsetting->string;
 783         barrier();              /* The altsetting might change! */
 784
 785         if (!string)
 786                 return 0;
 787         return sprintf(buf, "%s\n", string);
 788 }
 789 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
 790
 791 static ssize_t show_modalias(struct device *dev,
 792                 struct device_attribute *attr, char *buf)
 793 {
 794         struct usb_interface *intf;
 795         struct usb_device *udev;
 796         struct usb_host_interface *alt;
 797
 798         intf = to_usb_interface(dev);
 799         udev = interface_to_usbdev(intf);
 800         alt = intf->cur_altsetting;
 801
 802         return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
 803                         "ic%02Xisc%02Xip%02X\n",
 804                         le16_to_cpu(udev->descriptor.idVendor),
 805                         le16_to_cpu(udev->descriptor.idProduct),
 806                         le16_to_cpu(udev->descriptor.bcdDevice),
 807                         udev->descriptor.bDeviceClass,
 808                         udev->descriptor.bDeviceSubClass,
 809                         udev->descriptor.bDeviceProtocol,
 810                         alt->desc.bInterfaceClass,
 811                         alt->desc.bInterfaceSubClass,
 812                         alt->desc.bInterfaceProtocol);
 813 }
 814 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
 815
 816 static ssize_t show_supports_autosuspend(struct device *dev,
 817                 struct device_attribute *attr, char *buf)
 818 {
 819         struct usb_interface *intf;
 820         struct usb_device *udev;
 821         int ret;
 822
 823         intf = to_usb_interface(dev);
 824         udev = interface_to_usbdev(intf);
 825
 826         usb_lock_device(udev);
 827         /* Devices will be autosuspended even when an interface isn't claimed */
 828         if (!intf->dev.driver ||
 829                         to_usb_driver(intf->dev.driver)->supports_autosuspend)
 830                 ret = sprintf(buf, "%u\n", 1);
 831         else
 832                 ret = sprintf(buf, "%u\n", 0);
 833         usb_unlock_device(udev);
 834
 835         return ret;
 836 }
 837 static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
 838
 839 static struct attribute *intf_attrs[] = {
 840         &dev_attr_bInterfaceNumber.attr,
 841         &dev_attr_bAlternateSetting.attr,
 842         &dev_attr_bNumEndpoints.attr,
 843         &dev_attr_bInterfaceClass.attr,
 844         &dev_attr_bInterfaceSubClass.attr,
 845         &dev_attr_bInterfaceProtocol.attr,
 846         &dev_attr_modalias.attr,
 847         &dev_attr_supports_autosuspend.attr,
 848         NULL,
 849 };
 850 static struct attribute_group intf_attr_grp = {
 851         .attrs = intf_attrs,
 852 };
 853
 854 static struct attribute *intf_assoc_attrs[] = {
 855         &dev_attr_iad_bFirstInterface.attr,
 856         &dev_attr_iad_bInterfaceCount.attr,
 857         &dev_attr_iad_bFunctionClass.attr,
 858         &dev_attr_iad_bFunctionSubClass.attr,
 859         &dev_attr_iad_bFunctionProtocol.attr,
 860         NULL,
 861 };
 862
 863 static mode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
 864                 struct attribute *a, int n)
 865 {
 866         struct device *dev = container_of(kobj, struct device, kobj);
 867         struct usb_interface *intf = to_usb_interface(dev);
 868
 869         if (intf->intf_assoc == NULL)
 870                 return 0;
 871         return a->mode;
 872 }
 873
 874 static struct attribute_group intf_assoc_attr_grp = {
 875         .attrs =        intf_assoc_attrs,
 876         .is_visible =   intf_assoc_attrs_are_visible,
 877 };
 878
 879 const struct attribute_group *usb_interface_groups[] = {
 880         &intf_attr_grp,
 881         &intf_assoc_attr_grp,
 882         NULL
 883 };
 884
 885 int usb_create_sysfs_intf_files(struct usb_interface *intf)
 886 {
 887         struct usb_device *udev = interface_to_usbdev(intf);
 888         struct usb_host_interface *alt = intf->cur_altsetting;
 889         int retval;
 890
 891         if (intf->sysfs_files_created || intf->unregistering)
 892                 return 0;
 893
 894         if (alt->string == NULL &&
 895                         !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
 896                 alt->string = usb_cache_string(udev, alt->desc.iInterface);
 897         if (alt->string)
 898                 retval = device_create_file(&intf->dev, &dev_attr_interface);
 899         intf->sysfs_files_created = 1;
 900         return 0;
 901 }
 902
 903 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
 904 {
 905         if (!intf->sysfs_files_created)
 906                 return;
 907
 908         device_remove_file(&intf->dev, &dev_attr_interface);
 909         intf->sysfs_files_created = 0;
 910 }