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