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_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 static const char suspend_string[] = "suspend";
 331
 332 static ssize_t
 333 show_level(struct device *dev, struct device_attribute *attr, char *buf)
 334 {
 335         struct usb_device *udev = to_usb_device(dev);
 336         const char *p = auto_string;
 337
 338         if (udev->state == USB_STATE_SUSPENDED) {
 339                 if (udev->autoresume_disabled)
 340                         p = suspend_string;
 341         } else {
 342                 if (udev->autosuspend_disabled)
 343                         p = on_string;
 344         }
 345         return sprintf(buf, "%s\n", p);
 346 }
 347
 348 static ssize_t
 349 set_level(struct device *dev, struct device_attribute *attr,
 350                 const char *buf, size_t count)
 351 {
 352         struct usb_device *udev = to_usb_device(dev);
 353         int len = count;
 354         char *cp;
 355         int rc = 0;
 356         int old_autosuspend_disabled, old_autoresume_disabled;
 357
 358         cp = memchr(buf, '\n', count);
 359         if (cp)
 360                 len = cp - buf;
 361
 362         usb_lock_device(udev);
 363         old_autosuspend_disabled = udev->autosuspend_disabled;
 364         old_autoresume_disabled = udev->autoresume_disabled;
 365
 366         /* Setting the flags without calling usb_pm_lock is a subject to
 367          * races, but who cares...
 368          */
 369         if (len == sizeof on_string - 1 &&
 370                         strncmp(buf, on_string, len) == 0) {
 371                 udev->autosuspend_disabled = 1;
 372                 udev->autoresume_disabled = 0;
 373                 rc = usb_external_resume_device(udev, PMSG_USER_RESUME);
 374
 375         } else if (len == sizeof auto_string - 1 &&
 376                         strncmp(buf, auto_string, len) == 0) {
 377                 udev->autosuspend_disabled = 0;
 378                 udev->autoresume_disabled = 0;
 379                 rc = usb_external_resume_device(udev, PMSG_USER_RESUME);
 380
 381         } else if (len == sizeof suspend_string - 1 &&
 382                         strncmp(buf, suspend_string, len) == 0) {
 383                 udev->autosuspend_disabled = 0;
 384                 udev->autoresume_disabled = 1;
 385                 rc = usb_external_suspend_device(udev, PMSG_USER_SUSPEND);
 386
 387         } else
 388                 rc = -EINVAL;
 389
 390         if (rc) {
 391                 udev->autosuspend_disabled = old_autosuspend_disabled;
 392                 udev->autoresume_disabled = old_autoresume_disabled;
 393         }
 394         usb_unlock_device(udev);
 395         return (rc < 0 ? rc : count);
 396 }
 397
 398 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
 399
 400 static int add_power_attributes(struct device *dev)
 401 {
 402         int rc = 0;
 403
 404         if (is_usb_device(dev)) {
 405                 rc = sysfs_add_file_to_group(&dev->kobj,
 406                                 &dev_attr_autosuspend.attr,
 407                                 power_group);
 408                 if (rc == 0)
 409                         rc = sysfs_add_file_to_group(&dev->kobj,
 410                                         &dev_attr_level.attr,
 411                                         power_group);
 412                 if (rc == 0)
 413                         rc = sysfs_add_file_to_group(&dev->kobj,
 414                                         &dev_attr_connected_duration.attr,
 415                                         power_group);
 416                 if (rc == 0)
 417                         rc = sysfs_add_file_to_group(&dev->kobj,
 418                                         &dev_attr_active_duration.attr,
 419                                         power_group);
 420         }
 421         return rc;
 422 }
 423
 424 static void remove_power_attributes(struct device *dev)
 425 {
 426         sysfs_remove_file_from_group(&dev->kobj,
 427                         &dev_attr_active_duration.attr,
 428                         power_group);
 429         sysfs_remove_file_from_group(&dev->kobj,
 430                         &dev_attr_connected_duration.attr,
 431                         power_group);
 432         sysfs_remove_file_from_group(&dev->kobj,
 433                         &dev_attr_level.attr,
 434                         power_group);
 435         sysfs_remove_file_from_group(&dev->kobj,
 436                         &dev_attr_autosuspend.attr,
 437                         power_group);
 438 }
 439
 440 #else
 441
 442 #define add_power_attributes(dev)       0
 443 #define remove_power_attributes(dev)    do {} while (0)
 444
 445 #endif  /* CONFIG_USB_SUSPEND */
 446
 447
 448 /* Descriptor fields */
 449 #define usb_descriptor_attr_le16(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,                              \
 458                         le16_to_cpu(udev->descriptor.field));           \
 459 }                                                                       \
 460 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 461
 462 usb_descriptor_attr_le16(idVendor, "%04x\n")
 463 usb_descriptor_attr_le16(idProduct, "%04x\n")
 464 usb_descriptor_attr_le16(bcdDevice, "%04x\n")
 465
 466 #define usb_descriptor_attr(field, format_string)                       \
 467 static ssize_t                                                          \
 468 show_##field(struct device *dev, struct device_attribute *attr, \
 469                 char *buf)                                              \
 470 {                                                                       \
 471         struct usb_device *udev;                                        \
 472                                                                         \
 473         udev = to_usb_device(dev);                                      \
 474         return sprintf(buf, format_string, udev->descriptor.field);     \
 475 }                                                                       \
 476 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 477
 478 usb_descriptor_attr(bDeviceClass, "%02x\n")
 479 usb_descriptor_attr(bDeviceSubClass, "%02x\n")
 480 usb_descriptor_attr(bDeviceProtocol, "%02x\n")
 481 usb_descriptor_attr(bNumConfigurations, "%d\n")
 482 usb_descriptor_attr(bMaxPacketSize0, "%d\n")
 483
 484
 485
 486 /* show if the device is authorized (1) or not (0) */
 487 static ssize_t usb_dev_authorized_show(struct device *dev,
 488                                        struct device_attribute *attr,
 489                                        char *buf)
 490 {
 491         struct usb_device *usb_dev = to_usb_device(dev);
 492         return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
 493 }
 494
 495
 496 /*
 497  * Authorize a device to be used in the system
 498  *
 499  * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
 500  */
 501 static ssize_t usb_dev_authorized_store(struct device *dev,
 502                                         struct device_attribute *attr,
 503                                         const char *buf, size_t size)
 504 {
 505         ssize_t result;
 506         struct usb_device *usb_dev = to_usb_device(dev);
 507         unsigned val;
 508         result = sscanf(buf, "%u\n", &val);
 509         if (result != 1)
 510                 result = -EINVAL;
 511         else if (val == 0)
 512                 result = usb_deauthorize_device(usb_dev);
 513         else
 514                 result = usb_authorize_device(usb_dev);
 515         return result < 0? result : size;
 516 }
 517
 518 static DEVICE_ATTR(authorized, 0644,
 519             usb_dev_authorized_show, usb_dev_authorized_store);
 520
 521
 522 static struct attribute *dev_attrs[] = {
 523         /* current configuration's attributes */
 524         &dev_attr_configuration.attr,
 525         &dev_attr_bNumInterfaces.attr,
 526         &dev_attr_bConfigurationValue.attr,
 527         &dev_attr_bmAttributes.attr,
 528         &dev_attr_bMaxPower.attr,
 529         &dev_attr_urbnum.attr,
 530         /* device attributes */
 531         &dev_attr_idVendor.attr,
 532         &dev_attr_idProduct.attr,
 533         &dev_attr_bcdDevice.attr,
 534         &dev_attr_bDeviceClass.attr,
 535         &dev_attr_bDeviceSubClass.attr,
 536         &dev_attr_bDeviceProtocol.attr,
 537         &dev_attr_bNumConfigurations.attr,
 538         &dev_attr_bMaxPacketSize0.attr,
 539         &dev_attr_speed.attr,
 540         &dev_attr_busnum.attr,
 541         &dev_attr_devnum.attr,
 542         &dev_attr_version.attr,
 543         &dev_attr_maxchild.attr,
 544         &dev_attr_quirks.attr,
 545         &dev_attr_authorized.attr,
 546         NULL,
 547 };
 548 static struct attribute_group dev_attr_grp = {
 549         .attrs = dev_attrs,
 550 };
 551
 552 /* When modifying this list, be sure to modify dev_string_attrs_are_visible()
 553  * accordingly.
 554  */
 555 static struct attribute *dev_string_attrs[] = {
 556         &dev_attr_manufacturer.attr,
 557         &dev_attr_product.attr,
 558         &dev_attr_serial.attr,
 559         NULL
 560 };
 561
 562 static mode_t dev_string_attrs_are_visible(struct kobject *kobj,
 563                 struct attribute *a, int n)
 564 {
 565         struct device *dev = container_of(kobj, struct device, kobj);
 566         struct usb_device *udev = to_usb_device(dev);
 567
 568         if (a == &dev_attr_manufacturer.attr) {
 569                 if (udev->manufacturer == NULL)
 570                         return 0;
 571         } else if (a == &dev_attr_product.attr) {
 572                 if (udev->product == NULL)
 573                         return 0;
 574         } else if (a == &dev_attr_serial.attr) {
 575                 if (udev->serial == NULL)
 576                         return 0;
 577         }
 578         return a->mode;
 579 }
 580
 581 static struct attribute_group dev_string_attr_grp = {
 582         .attrs =        dev_string_attrs,
 583         .is_visible =   dev_string_attrs_are_visible,
 584 };
 585
 586 const struct attribute_group *usb_device_groups[] = {
 587         &dev_attr_grp,
 588         &dev_string_attr_grp,
 589         NULL
 590 };
 591
 592 /* Binary descriptors */
 593
 594 static ssize_t
 595 read_descriptors(struct kobject *kobj, struct bin_attribute *attr,
 596                 char *buf, loff_t off, size_t count)
 597 {
 598         struct device *dev = container_of(kobj, struct device, kobj);
 599         struct usb_device *udev = to_usb_device(dev);
 600         size_t nleft = count;
 601         size_t srclen, n;
 602         int cfgno;
 603         void *src;
 604
 605         /* The binary attribute begins with the device descriptor.
 606          * Following that are the raw descriptor entries for all the
 607          * configurations (config plus subsidiary descriptors).
 608          */
 609         for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
 610                         nleft > 0; ++cfgno) {
 611                 if (cfgno < 0) {
 612                         src = &udev->descriptor;
 613                         srclen = sizeof(struct usb_device_descriptor);
 614                 } else {
 615                         src = udev->rawdescriptors[cfgno];
 616                         srclen = __le16_to_cpu(udev->config[cfgno].desc.
 617                                         wTotalLength);
 618                 }
 619                 if (off < srclen) {
 620                         n = min(nleft, srclen - (size_t) off);
 621                         memcpy(buf, src + off, n);
 622                         nleft -= n;
 623                         buf += n;
 624                         off = 0;
 625                 } else {
 626                         off -= srclen;
 627                 }
 628         }
 629         return count - nleft;
 630 }
 631
 632 static struct bin_attribute dev_bin_attr_descriptors = {
 633         .attr = {.name = "descriptors", .mode = 0444},
 634         .read = read_descriptors,
 635         .size = 18 + 65535,     /* dev descr + max-size raw descriptor */
 636 };
 637
 638 int usb_create_sysfs_dev_files(struct usb_device *udev)
 639 {
 640         struct device *dev = &udev->dev;
 641         int retval;
 642
 643         retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
 644         if (retval)
 645                 goto error;
 646
 647         retval = add_persist_attributes(dev);
 648         if (retval)
 649                 goto error;
 650
 651         retval = add_power_attributes(dev);
 652         if (retval)
 653                 goto error;
 654         return retval;
 655 error:
 656         usb_remove_sysfs_dev_files(udev);
 657         return retval;
 658 }
 659
 660 void usb_remove_sysfs_dev_files(struct usb_device *udev)
 661 {
 662         struct device *dev = &udev->dev;
 663
 664         remove_power_attributes(dev);
 665         remove_persist_attributes(dev);
 666         device_remove_bin_file(dev, &dev_bin_attr_descriptors);
 667 }
 668
 669 /* Interface Accociation Descriptor fields */
 670 #define usb_intf_assoc_attr(field, format_string)                       \
 671 static ssize_t                                                          \
 672 show_iad_##field(struct device *dev, struct device_attribute *attr,     \
 673                 char *buf)                                              \
 674 {                                                                       \
 675         struct usb_interface *intf = to_usb_interface(dev);             \
 676                                                                         \
 677         return sprintf(buf, format_string,                              \
 678                         intf->intf_assoc->field);                       \
 679 }                                                                       \
 680 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
 681
 682 usb_intf_assoc_attr(bFirstInterface, "%02x\n")
 683 usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
 684 usb_intf_assoc_attr(bFunctionClass, "%02x\n")
 685 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
 686 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
 687
 688 /* Interface fields */
 689 #define usb_intf_attr(field, format_string)                             \
 690 static ssize_t                                                          \
 691 show_##field(struct device *dev, struct device_attribute *attr, \
 692                 char *buf)                                              \
 693 {                                                                       \
 694         struct usb_interface *intf = to_usb_interface(dev);             \
 695                                                                         \
 696         return sprintf(buf, format_string,                              \
 697                         intf->cur_altsetting->desc.field);              \
 698 }                                                                       \
 699 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 700
 701 usb_intf_attr(bInterfaceNumber, "%02x\n")
 702 usb_intf_attr(bAlternateSetting, "%2d\n")
 703 usb_intf_attr(bNumEndpoints, "%02x\n")
 704 usb_intf_attr(bInterfaceClass, "%02x\n")
 705 usb_intf_attr(bInterfaceSubClass, "%02x\n")
 706 usb_intf_attr(bInterfaceProtocol, "%02x\n")
 707
 708 static ssize_t show_interface_string(struct device *dev,
 709                 struct device_attribute *attr, char *buf)
 710 {
 711         struct usb_interface *intf;
 712         char *string;
 713
 714         intf = to_usb_interface(dev);
 715         string = intf->cur_altsetting->string;
 716         barrier();              /* The altsetting might change! */
 717
 718         if (!string)
 719                 return 0;
 720         return sprintf(buf, "%s\n", string);
 721 }
 722 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
 723
 724 static ssize_t show_modalias(struct device *dev,
 725                 struct device_attribute *attr, char *buf)
 726 {
 727         struct usb_interface *intf;
 728         struct usb_device *udev;
 729         struct usb_host_interface *alt;
 730
 731         intf = to_usb_interface(dev);
 732         udev = interface_to_usbdev(intf);
 733         alt = intf->cur_altsetting;
 734
 735         return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
 736                         "ic%02Xisc%02Xip%02X\n",
 737                         le16_to_cpu(udev->descriptor.idVendor),
 738                         le16_to_cpu(udev->descriptor.idProduct),
 739                         le16_to_cpu(udev->descriptor.bcdDevice),
 740                         udev->descriptor.bDeviceClass,
 741                         udev->descriptor.bDeviceSubClass,
 742                         udev->descriptor.bDeviceProtocol,
 743                         alt->desc.bInterfaceClass,
 744                         alt->desc.bInterfaceSubClass,
 745                         alt->desc.bInterfaceProtocol);
 746 }
 747 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
 748
 749 static ssize_t show_supports_autosuspend(struct device *dev,
 750                 struct device_attribute *attr, char *buf)
 751 {
 752         struct usb_interface *intf;
 753         struct usb_device *udev;
 754         int ret;
 755
 756         intf = to_usb_interface(dev);
 757         udev = interface_to_usbdev(intf);
 758
 759         usb_lock_device(udev);
 760         /* Devices will be autosuspended even when an interface isn't claimed */
 761         if (!intf->dev.driver ||
 762                         to_usb_driver(intf->dev.driver)->supports_autosuspend)
 763                 ret = sprintf(buf, "%u\n", 1);
 764         else
 765                 ret = sprintf(buf, "%u\n", 0);
 766         usb_unlock_device(udev);
 767
 768         return ret;
 769 }
 770 static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
 771
 772 static struct attribute *intf_attrs[] = {
 773         &dev_attr_bInterfaceNumber.attr,
 774         &dev_attr_bAlternateSetting.attr,
 775         &dev_attr_bNumEndpoints.attr,
 776         &dev_attr_bInterfaceClass.attr,
 777         &dev_attr_bInterfaceSubClass.attr,
 778         &dev_attr_bInterfaceProtocol.attr,
 779         &dev_attr_modalias.attr,
 780         &dev_attr_supports_autosuspend.attr,
 781         NULL,
 782 };
 783 static struct attribute_group intf_attr_grp = {
 784         .attrs = intf_attrs,
 785 };
 786
 787 static struct attribute *intf_assoc_attrs[] = {
 788         &dev_attr_iad_bFirstInterface.attr,
 789         &dev_attr_iad_bInterfaceCount.attr,
 790         &dev_attr_iad_bFunctionClass.attr,
 791         &dev_attr_iad_bFunctionSubClass.attr,
 792         &dev_attr_iad_bFunctionProtocol.attr,
 793         NULL,
 794 };
 795
 796 static mode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
 797                 struct attribute *a, int n)
 798 {
 799         struct device *dev = container_of(kobj, struct device, kobj);
 800         struct usb_interface *intf = to_usb_interface(dev);
 801
 802         if (intf->intf_assoc == NULL)
 803                 return 0;
 804         return a->mode;
 805 }
 806
 807 static struct attribute_group intf_assoc_attr_grp = {
 808         .attrs =        intf_assoc_attrs,
 809         .is_visible =   intf_assoc_attrs_are_visible,
 810 };
 811
 812 const struct attribute_group *usb_interface_groups[] = {
 813         &intf_attr_grp,
 814         &intf_assoc_attr_grp,
 815         NULL
 816 };
 817
 818 int usb_create_sysfs_intf_files(struct usb_interface *intf)
 819 {
 820         struct usb_device *udev = interface_to_usbdev(intf);
 821         struct usb_host_interface *alt = intf->cur_altsetting;
 822         int retval;
 823
 824         if (intf->sysfs_files_created || intf->unregistering)
 825                 return 0;
 826
 827         if (alt->string == NULL &&
 828                         !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
 829                 alt->string = usb_cache_string(udev, alt->desc.iInterface);
 830         if (alt->string)
 831                 retval = device_create_file(&intf->dev, &dev_attr_interface);
 832         intf->sysfs_files_created = 1;
 833         return 0;
 834 }
 835
 836 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
 837 {
 838         if (!intf->sysfs_files_created)
 839                 return;
 840
 841         device_remove_file(&intf->dev, &dev_attr_interface);
 842         intf->sysfs_files_created = 0;
 843 }