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