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