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 "usb.h"
  17
  18 /* Active configuration fields */
  19 #define usb_actconfig_show(field, multiplier, format_string)            \
  20 static ssize_t  show_##field(struct device *dev,                        \
  21                 struct device_attribute *attr, char *buf)               \
  22 {                                                                       \
  23         struct usb_device *udev;                                        \
  24         struct usb_host_config *actconfig;                              \
  25                                                                         \
  26         udev = to_usb_device(dev);                                      \
  27         actconfig = udev->actconfig;                                    \
  28         if (actconfig)                                                  \
  29                 return sprintf(buf, format_string,                      \
  30                                 actconfig->desc.field * multiplier);    \
  31         else                                                            \
  32                 return 0;                                               \
  33 }                                                                       \
  34
  35 #define usb_actconfig_attr(field, multiplier, format_string)            \
  36 usb_actconfig_show(field, multiplier, format_string)                    \
  37 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
  38
  39 usb_actconfig_attr(bNumInterfaces, 1, "%2d\n")
  40 usb_actconfig_attr(bmAttributes, 1, "%2x\n")
  41 usb_actconfig_attr(bMaxPower, 2, "%3dmA\n")
  42
  43 static ssize_t show_configuration_string(struct device *dev,
  44                 struct device_attribute *attr, char *buf)
  45 {
  46         struct usb_device *udev;
  47         struct usb_host_config *actconfig;
  48
  49         udev = to_usb_device(dev);
  50         actconfig = udev->actconfig;
  51         if ((!actconfig) || (!actconfig->string))
  52                 return 0;
  53         return sprintf(buf, "%s\n", actconfig->string);
  54 }
  55 static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL);
  56
  57 /* configuration value is always present, and r/w */
  58 usb_actconfig_show(bConfigurationValue, 1, "%u\n");
  59
  60 static ssize_t
  61 set_bConfigurationValue(struct device *dev, struct device_attribute *attr,
  62                 const char *buf, size_t count)
  63 {
  64         struct usb_device       *udev = to_usb_device(dev);
  65         int                     config, value;
  66
  67         if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
  68                 return -EINVAL;
  69         usb_lock_device(udev);
  70         value = usb_set_configuration(udev, config);
  71         usb_unlock_device(udev);
  72         return (value < 0) ? value : count;
  73 }
  74
  75 static DEVICE_ATTR(bConfigurationValue, S_IRUGO | S_IWUSR,
  76                 show_bConfigurationValue, set_bConfigurationValue);
  77
  78 /* String fields */
  79 #define usb_string_attr(name)                                           \
  80 static ssize_t  show_##name(struct device *dev,                         \
  81                 struct device_attribute *attr, char *buf)               \
  82 {                                                                       \
  83         struct usb_device *udev;                                        \
  84                                                                         \
  85         udev = to_usb_device(dev);                                      \
  86         return sprintf(buf, "%s\n", udev->name);                        \
  87 }                                                                       \
  88 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
  89
  90 usb_string_attr(product);
  91 usb_string_attr(manufacturer);
  92 usb_string_attr(serial);
  93
  94 static ssize_t
  95 show_speed(struct device *dev, struct device_attribute *attr, char *buf)
  96 {
  97         struct usb_device *udev;
  98         char *speed;
  99
 100         udev = to_usb_device(dev);
 101
 102         switch (udev->speed) {
 103         case USB_SPEED_LOW:
 104                 speed = "1.5";
 105                 break;
 106         case USB_SPEED_UNKNOWN:
 107         case USB_SPEED_FULL:
 108                 speed = "12";
 109                 break;
 110         case USB_SPEED_HIGH:
 111                 speed = "480";
 112                 break;
 113         default:
 114                 speed = "unknown";
 115         }
 116         return sprintf(buf, "%s\n", speed);
 117 }
 118 static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL);
 119
 120 static ssize_t
 121 show_busnum(struct device *dev, struct device_attribute *attr, char *buf)
 122 {
 123         struct usb_device *udev;
 124
 125         udev = to_usb_device(dev);
 126         return sprintf(buf, "%d\n", udev->bus->busnum);
 127 }
 128 static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL);
 129
 130 static ssize_t
 131 show_devnum(struct device *dev, struct device_attribute *attr, char *buf)
 132 {
 133         struct usb_device *udev;
 134
 135         udev = to_usb_device(dev);
 136         return sprintf(buf, "%d\n", udev->devnum);
 137 }
 138 static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL);
 139
 140 static ssize_t
 141 show_version(struct device *dev, struct device_attribute *attr, char *buf)
 142 {
 143         struct usb_device *udev;
 144         u16 bcdUSB;
 145
 146         udev = to_usb_device(dev);
 147         bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
 148         return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
 149 }
 150 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
 151
 152 static ssize_t
 153 show_maxchild(struct device *dev, struct device_attribute *attr, char *buf)
 154 {
 155         struct usb_device *udev;
 156
 157         udev = to_usb_device(dev);
 158         return sprintf(buf, "%d\n", udev->maxchild);
 159 }
 160 static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL);
 161
 162 static ssize_t
 163 show_quirks(struct device *dev, struct device_attribute *attr, char *buf)
 164 {
 165         struct usb_device *udev;
 166
 167         udev = to_usb_device(dev);
 168         return sprintf(buf, "0x%x\n", udev->quirks);
 169 }
 170 static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);
 171
 172 static ssize_t
 173 show_urbnum(struct device *dev, struct device_attribute *attr, char *buf)
 174 {
 175         struct usb_device *udev;
 176
 177         udev = to_usb_device(dev);
 178         return sprintf(buf, "%d\n", atomic_read(&udev->urbnum));
 179 }
 180 static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL);
 181
 182
 183 #if defined(CONFIG_USB_PERSIST) || defined(CONFIG_USB_SUSPEND)
 184 static const char power_group[] = "power";
 185 #endif
 186
 187 #ifdef  CONFIG_USB_PERSIST
 188
 189 static ssize_t
 190 show_persist(struct device *dev, struct device_attribute *attr, char *buf)
 191 {
 192         struct usb_device *udev = to_usb_device(dev);
 193
 194         return sprintf(buf, "%d\n", udev->persist_enabled);
 195 }
 196
 197 static ssize_t
 198 set_persist(struct device *dev, struct device_attribute *attr,
 199                 const char *buf, size_t count)
 200 {
 201         struct usb_device *udev = to_usb_device(dev);
 202         int value;
 203
 204         /* Hubs are always enabled for USB_PERSIST */
 205         if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
 206                 return -EPERM;
 207
 208         if (sscanf(buf, "%d", &value) != 1)
 209                 return -EINVAL;
 210         usb_pm_lock(udev);
 211         udev->persist_enabled = !!value;
 212         usb_pm_unlock(udev);
 213         return count;
 214 }
 215
 216 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
 217
 218 static int add_persist_attributes(struct device *dev)
 219 {
 220         int rc = 0;
 221
 222         if (is_usb_device(dev)) {
 223                 struct usb_device *udev = to_usb_device(dev);
 224
 225                 /* Hubs are automatically enabled for USB_PERSIST */
 226                 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
 227                         udev->persist_enabled = 1;
 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
 242 #else
 243
 244 #define add_persist_attributes(dev)     0
 245 #define remove_persist_attributes(dev)  do {} while (0)
 246
 247 #endif  /* CONFIG_USB_PERSIST */
 248
 249 #ifdef  CONFIG_USB_SUSPEND
 250
 251 static ssize_t
 252 show_connected_duration(struct device *dev, struct device_attribute *attr,
 253                 char *buf)
 254 {
 255         struct usb_device *udev = to_usb_device(dev);
 256
 257         return sprintf(buf, "%u\n",
 258                         jiffies_to_msecs(jiffies - udev->connect_time));
 259 }
 260
 261 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
 262
 263 /*
 264  * If the device is resumed, the last time the device was suspended has
 265  * been pre-subtracted from active_duration.  We add the current time to
 266  * get the duration that the device was actually active.
 267  *
 268  * If the device is suspended, the active_duration is up-to-date.
 269  */
 270 static ssize_t
 271 show_active_duration(struct device *dev, struct device_attribute *attr,
 272                 char *buf)
 273 {
 274         struct usb_device *udev = to_usb_device(dev);
 275         int duration;
 276
 277         if (udev->state != USB_STATE_SUSPENDED)
 278                 duration = jiffies_to_msecs(jiffies + udev->active_duration);
 279         else
 280                 duration = jiffies_to_msecs(udev->active_duration);
 281         return sprintf(buf, "%u\n", duration);
 282 }
 283
 284 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
 285
 286 static ssize_t
 287 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
 288 {
 289         struct usb_device *udev = to_usb_device(dev);
 290
 291         return sprintf(buf, "%d\n", udev->autosuspend_delay / HZ);
 292 }
 293
 294 static ssize_t
 295 set_autosuspend(struct device *dev, struct device_attribute *attr,
 296                 const char *buf, size_t count)
 297 {
 298         struct usb_device *udev = to_usb_device(dev);
 299         int value;
 300
 301         if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/HZ ||
 302                         value <= - INT_MAX/HZ)
 303                 return -EINVAL;
 304         value *= HZ;
 305
 306         udev->autosuspend_delay = value;
 307         if (value >= 0)
 308                 usb_try_autosuspend_device(udev);
 309         else {
 310                 if (usb_autoresume_device(udev) == 0)
 311                         usb_autosuspend_device(udev);
 312         }
 313         return count;
 314 }
 315
 316 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
 317                 show_autosuspend, set_autosuspend);
 318
 319 static const char on_string[] = "on";
 320 static const char auto_string[] = "auto";
 321 static const char suspend_string[] = "suspend";
 322
 323 static ssize_t
 324 show_level(struct device *dev, struct device_attribute *attr, char *buf)
 325 {
 326         struct usb_device *udev = to_usb_device(dev);
 327         const char *p = auto_string;
 328
 329         if (udev->state == USB_STATE_SUSPENDED) {
 330                 if (udev->autoresume_disabled)
 331                         p = suspend_string;
 332         } else {
 333                 if (udev->autosuspend_disabled)
 334                         p = on_string;
 335         }
 336         return sprintf(buf, "%s\n", p);
 337 }
 338
 339 static ssize_t
 340 set_level(struct device *dev, struct device_attribute *attr,
 341                 const char *buf, size_t count)
 342 {
 343         struct usb_device *udev = to_usb_device(dev);
 344         int len = count;
 345         char *cp;
 346         int rc = 0;
 347         int old_autosuspend_disabled, old_autoresume_disabled;
 348
 349         cp = memchr(buf, '\n', count);
 350         if (cp)
 351                 len = cp - buf;
 352
 353         usb_lock_device(udev);
 354         old_autosuspend_disabled = udev->autosuspend_disabled;
 355         old_autoresume_disabled = udev->autoresume_disabled;
 356
 357         /* Setting the flags without calling usb_pm_lock is a subject to
 358          * races, but who cares...
 359          */
 360         if (len == sizeof on_string - 1 &&
 361                         strncmp(buf, on_string, len) == 0) {
 362                 udev->autosuspend_disabled = 1;
 363                 udev->autoresume_disabled = 0;
 364                 rc = usb_external_resume_device(udev);
 365
 366         } else if (len == sizeof auto_string - 1 &&
 367                         strncmp(buf, auto_string, len) == 0) {
 368                 udev->autosuspend_disabled = 0;
 369                 udev->autoresume_disabled = 0;
 370                 rc = usb_external_resume_device(udev);
 371
 372         } else if (len == sizeof suspend_string - 1 &&
 373                         strncmp(buf, suspend_string, len) == 0) {
 374                 udev->autosuspend_disabled = 0;
 375                 udev->autoresume_disabled = 1;
 376                 rc = usb_external_suspend_device(udev, PMSG_SUSPEND);
 377
 378         } else
 379                 rc = -EINVAL;
 380
 381         if (rc) {
 382                 udev->autosuspend_disabled = old_autosuspend_disabled;
 383                 udev->autoresume_disabled = old_autoresume_disabled;
 384         }
 385         usb_unlock_device(udev);
 386         return (rc < 0 ? rc : count);
 387 }
 388
 389 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
 390
 391 static int add_power_attributes(struct device *dev)
 392 {
 393         int rc = 0;
 394
 395         if (is_usb_device(dev)) {
 396                 rc = sysfs_add_file_to_group(&dev->kobj,
 397                                 &dev_attr_autosuspend.attr,
 398                                 power_group);
 399                 if (rc == 0)
 400                         rc = sysfs_add_file_to_group(&dev->kobj,
 401                                         &dev_attr_level.attr,
 402                                         power_group);
 403                 if (rc == 0)
 404                         rc = sysfs_add_file_to_group(&dev->kobj,
 405                                         &dev_attr_connected_duration.attr,
 406                                         power_group);
 407                 if (rc == 0)
 408                         rc = sysfs_add_file_to_group(&dev->kobj,
 409                                         &dev_attr_active_duration.attr,
 410                                         power_group);
 411         }
 412         return rc;
 413 }
 414
 415 static void remove_power_attributes(struct device *dev)
 416 {
 417         sysfs_remove_file_from_group(&dev->kobj,
 418                         &dev_attr_active_duration.attr,
 419                         power_group);
 420         sysfs_remove_file_from_group(&dev->kobj,
 421                         &dev_attr_connected_duration.attr,
 422                         power_group);
 423         sysfs_remove_file_from_group(&dev->kobj,
 424                         &dev_attr_level.attr,
 425                         power_group);
 426         sysfs_remove_file_from_group(&dev->kobj,
 427                         &dev_attr_autosuspend.attr,
 428                         power_group);
 429 }
 430
 431 #else
 432
 433 #define add_power_attributes(dev)       0
 434 #define remove_power_attributes(dev)    do {} while (0)
 435
 436 #endif  /* CONFIG_USB_SUSPEND */
 437
 438
 439 /* Descriptor fields */
 440 #define usb_descriptor_attr_le16(field, format_string)                  \
 441 static ssize_t                                                          \
 442 show_##field(struct device *dev, struct device_attribute *attr, \
 443                 char *buf)                                              \
 444 {                                                                       \
 445         struct usb_device *udev;                                        \
 446                                                                         \
 447         udev = to_usb_device(dev);                                      \
 448         return sprintf(buf, format_string,                              \
 449                         le16_to_cpu(udev->descriptor.field));           \
 450 }                                                                       \
 451 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 452
 453 usb_descriptor_attr_le16(idVendor, "%04x\n")
 454 usb_descriptor_attr_le16(idProduct, "%04x\n")
 455 usb_descriptor_attr_le16(bcdDevice, "%04x\n")
 456
 457 #define usb_descriptor_attr(field, format_string)                       \
 458 static ssize_t                                                          \
 459 show_##field(struct device *dev, struct device_attribute *attr, \
 460                 char *buf)                                              \
 461 {                                                                       \
 462         struct usb_device *udev;                                        \
 463                                                                         \
 464         udev = to_usb_device(dev);                                      \
 465         return sprintf(buf, format_string, udev->descriptor.field);     \
 466 }                                                                       \
 467 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 468
 469 usb_descriptor_attr(bDeviceClass, "%02x\n")
 470 usb_descriptor_attr(bDeviceSubClass, "%02x\n")
 471 usb_descriptor_attr(bDeviceProtocol, "%02x\n")
 472 usb_descriptor_attr(bNumConfigurations, "%d\n")
 473 usb_descriptor_attr(bMaxPacketSize0, "%d\n")
 474
 475
 476
 477 /* show if the device is authorized (1) or not (0) */
 478 static ssize_t usb_dev_authorized_show(struct device *dev,
 479                                        struct device_attribute *attr,
 480                                        char *buf)
 481 {
 482         struct usb_device *usb_dev = to_usb_device(dev);
 483         return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
 484 }
 485
 486
 487 /*
 488  * Authorize a device to be used in the system
 489  *
 490  * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
 491  */
 492 static ssize_t usb_dev_authorized_store(struct device *dev,
 493                                         struct device_attribute *attr,
 494                                         const char *buf, size_t size)
 495 {
 496         ssize_t result;
 497         struct usb_device *usb_dev = to_usb_device(dev);
 498         unsigned val;
 499         result = sscanf(buf, "%u\n", &val);
 500         if (result != 1)
 501                 result = -EINVAL;
 502         else if (val == 0)
 503                 result = usb_deauthorize_device(usb_dev);
 504         else
 505                 result = usb_authorize_device(usb_dev);
 506         return result < 0? result : size;
 507 }
 508
 509 static DEVICE_ATTR(authorized, 0644,
 510             usb_dev_authorized_show, usb_dev_authorized_store);
 511
 512
 513 static struct attribute *dev_attrs[] = {
 514         /* current configuration's attributes */
 515         &dev_attr_configuration.attr,
 516         &dev_attr_bNumInterfaces.attr,
 517         &dev_attr_bConfigurationValue.attr,
 518         &dev_attr_bmAttributes.attr,
 519         &dev_attr_bMaxPower.attr,
 520         &dev_attr_urbnum.attr,
 521         /* device attributes */
 522         &dev_attr_idVendor.attr,
 523         &dev_attr_idProduct.attr,
 524         &dev_attr_bcdDevice.attr,
 525         &dev_attr_bDeviceClass.attr,
 526         &dev_attr_bDeviceSubClass.attr,
 527         &dev_attr_bDeviceProtocol.attr,
 528         &dev_attr_bNumConfigurations.attr,
 529         &dev_attr_bMaxPacketSize0.attr,
 530         &dev_attr_speed.attr,
 531         &dev_attr_busnum.attr,
 532         &dev_attr_devnum.attr,
 533         &dev_attr_version.attr,
 534         &dev_attr_maxchild.attr,
 535         &dev_attr_quirks.attr,
 536         &dev_attr_authorized.attr,
 537         NULL,
 538 };
 539 static struct attribute_group dev_attr_grp = {
 540         .attrs = dev_attrs,
 541 };
 542
 543 /* Binary descriptors */
 544
 545 static ssize_t
 546 read_descriptors(struct kobject *kobj, struct bin_attribute *attr,
 547                 char *buf, loff_t off, size_t count)
 548 {
 549         struct usb_device *udev = to_usb_device(
 550                         container_of(kobj, struct device, kobj));
 551         size_t nleft = count;
 552         size_t srclen, n;
 553
 554         usb_lock_device(udev);
 555
 556         /* The binary attribute begins with the device descriptor */
 557         srclen = sizeof(struct usb_device_descriptor);
 558         if (off < srclen) {
 559                 n = min_t(size_t, nleft, srclen - off);
 560                 memcpy(buf, off + (char *) &udev->descriptor, n);
 561                 nleft -= n;
 562                 buf += n;
 563                 off = 0;
 564         } else {
 565                 off -= srclen;
 566         }
 567
 568         /* Then follows the raw descriptor entry for the current
 569          * configuration (config plus subsidiary descriptors).
 570          */
 571         if (udev->actconfig) {
 572                 int cfgno = udev->actconfig - udev->config;
 573
 574                 srclen = __le16_to_cpu(udev->actconfig->desc.wTotalLength);
 575                 if (off < srclen) {
 576                         n = min_t(size_t, nleft, srclen - off);
 577                         memcpy(buf, off + udev->rawdescriptors[cfgno], n);
 578                         nleft -= n;
 579                 }
 580         }
 581         usb_unlock_device(udev);
 582         return count - nleft;
 583 }
 584
 585 static struct bin_attribute dev_bin_attr_descriptors = {
 586         .attr = {.name = "descriptors", .mode = 0444},
 587         .read = read_descriptors,
 588         .size = 18 + 65535,     /* dev descr + max-size raw descriptor */
 589 };
 590
 591 int usb_create_sysfs_dev_files(struct usb_device *udev)
 592 {
 593         struct device *dev = &udev->dev;
 594         int retval;
 595
 596         retval = sysfs_create_group(&dev->kobj, &dev_attr_grp);
 597         if (retval)
 598                 return retval;
 599
 600         retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
 601         if (retval)
 602                 goto error;
 603
 604         retval = add_persist_attributes(dev);
 605         if (retval)
 606                 goto error;
 607
 608         retval = add_power_attributes(dev);
 609         if (retval)
 610                 goto error;
 611
 612         if (udev->manufacturer) {
 613                 retval = device_create_file(dev, &dev_attr_manufacturer);
 614                 if (retval)
 615                         goto error;
 616         }
 617         if (udev->product) {
 618                 retval = device_create_file(dev, &dev_attr_product);
 619                 if (retval)
 620                         goto error;
 621         }
 622         if (udev->serial) {
 623                 retval = device_create_file(dev, &dev_attr_serial);
 624                 if (retval)
 625                         goto error;
 626         }
 627         retval = usb_create_ep_files(dev, &udev->ep0, udev);
 628         if (retval)
 629                 goto error;
 630         return 0;
 631 error:
 632         usb_remove_sysfs_dev_files(udev);
 633         return retval;
 634 }
 635
 636 void usb_remove_sysfs_dev_files(struct usb_device *udev)
 637 {
 638         struct device *dev = &udev->dev;
 639
 640         usb_remove_ep_files(&udev->ep0);
 641         device_remove_file(dev, &dev_attr_manufacturer);
 642         device_remove_file(dev, &dev_attr_product);
 643         device_remove_file(dev, &dev_attr_serial);
 644         remove_power_attributes(dev);
 645         remove_persist_attributes(dev);
 646         device_remove_bin_file(dev, &dev_bin_attr_descriptors);
 647         sysfs_remove_group(&dev->kobj, &dev_attr_grp);
 648 }
 649
 650 /* Interface Accociation Descriptor fields */
 651 #define usb_intf_assoc_attr(field, format_string)                       \
 652 static ssize_t                                                          \
 653 show_iad_##field(struct device *dev, struct device_attribute *attr,     \
 654                 char *buf)                                              \
 655 {                                                                       \
 656         struct usb_interface *intf = to_usb_interface(dev);             \
 657                                                                         \
 658         return sprintf(buf, format_string,                              \
 659                         intf->intf_assoc->field);                       \
 660 }                                                                       \
 661 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
 662
 663 usb_intf_assoc_attr(bFirstInterface, "%02x\n")
 664 usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
 665 usb_intf_assoc_attr(bFunctionClass, "%02x\n")
 666 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
 667 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
 668
 669 /* Interface fields */
 670 #define usb_intf_attr(field, format_string)                             \
 671 static ssize_t                                                          \
 672 show_##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->cur_altsetting->desc.field);              \
 679 }                                                                       \
 680 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 681
 682 usb_intf_attr(bInterfaceNumber, "%02x\n")
 683 usb_intf_attr(bAlternateSetting, "%2d\n")
 684 usb_intf_attr(bNumEndpoints, "%02x\n")
 685 usb_intf_attr(bInterfaceClass, "%02x\n")
 686 usb_intf_attr(bInterfaceSubClass, "%02x\n")
 687 usb_intf_attr(bInterfaceProtocol, "%02x\n")
 688
 689 static ssize_t show_interface_string(struct device *dev,
 690                 struct device_attribute *attr, char *buf)
 691 {
 692         struct usb_interface *intf;
 693         struct usb_device *udev;
 694         int len;
 695
 696         intf = to_usb_interface(dev);
 697         udev = interface_to_usbdev(intf);
 698         len = snprintf(buf, 256, "%s", intf->cur_altsetting->string);
 699         if (len < 0)
 700                 return 0;
 701         buf[len] = '\n';
 702         buf[len+1] = 0;
 703         return len+1;
 704 }
 705 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
 706
 707 static ssize_t show_modalias(struct device *dev,
 708                 struct device_attribute *attr, char *buf)
 709 {
 710         struct usb_interface *intf;
 711         struct usb_device *udev;
 712         struct usb_host_interface *alt;
 713
 714         intf = to_usb_interface(dev);
 715         udev = interface_to_usbdev(intf);
 716         alt = intf->cur_altsetting;
 717
 718         return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
 719                         "ic%02Xisc%02Xip%02X\n",
 720                         le16_to_cpu(udev->descriptor.idVendor),
 721                         le16_to_cpu(udev->descriptor.idProduct),
 722                         le16_to_cpu(udev->descriptor.bcdDevice),
 723                         udev->descriptor.bDeviceClass,
 724                         udev->descriptor.bDeviceSubClass,
 725                         udev->descriptor.bDeviceProtocol,
 726                         alt->desc.bInterfaceClass,
 727                         alt->desc.bInterfaceSubClass,
 728                         alt->desc.bInterfaceProtocol);
 729 }
 730 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
 731
 732 static struct attribute *intf_assoc_attrs[] = {
 733         &dev_attr_iad_bFirstInterface.attr,
 734         &dev_attr_iad_bInterfaceCount.attr,
 735         &dev_attr_iad_bFunctionClass.attr,
 736         &dev_attr_iad_bFunctionSubClass.attr,
 737         &dev_attr_iad_bFunctionProtocol.attr,
 738         NULL,
 739 };
 740 static struct attribute_group intf_assoc_attr_grp = {
 741         .attrs = intf_assoc_attrs,
 742 };
 743
 744 static struct attribute *intf_attrs[] = {
 745         &dev_attr_bInterfaceNumber.attr,
 746         &dev_attr_bAlternateSetting.attr,
 747         &dev_attr_bNumEndpoints.attr,
 748         &dev_attr_bInterfaceClass.attr,
 749         &dev_attr_bInterfaceSubClass.attr,
 750         &dev_attr_bInterfaceProtocol.attr,
 751         &dev_attr_modalias.attr,
 752         NULL,
 753 };
 754 static struct attribute_group intf_attr_grp = {
 755         .attrs = intf_attrs,
 756 };
 757
 758 static inline void usb_create_intf_ep_files(struct usb_interface *intf,
 759                 struct usb_device *udev)
 760 {
 761         struct usb_host_interface *iface_desc;
 762         int i;
 763
 764         iface_desc = intf->cur_altsetting;
 765         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
 766                 usb_create_ep_files(&intf->dev, &iface_desc->endpoint[i],
 767                                 udev);
 768 }
 769
 770 static inline void usb_remove_intf_ep_files(struct usb_interface *intf)
 771 {
 772         struct usb_host_interface *iface_desc;
 773         int i;
 774
 775         iface_desc = intf->cur_altsetting;
 776         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
 777                 usb_remove_ep_files(&iface_desc->endpoint[i]);
 778 }
 779
 780 int usb_create_sysfs_intf_files(struct usb_interface *intf)
 781 {
 782         struct device *dev = &intf->dev;
 783         struct usb_device *udev = interface_to_usbdev(intf);
 784         struct usb_host_interface *alt = intf->cur_altsetting;
 785         int retval;
 786
 787         if (intf->sysfs_files_created)
 788                 return 0;
 789         retval = sysfs_create_group(&dev->kobj, &intf_attr_grp);
 790         if (retval)
 791                 return retval;
 792
 793         if (alt->string == NULL)
 794                 alt->string = usb_cache_string(udev, alt->desc.iInterface);
 795         if (alt->string)
 796                 retval = device_create_file(dev, &dev_attr_interface);
 797         if (intf->intf_assoc)
 798                 retval = sysfs_create_group(&dev->kobj, &intf_assoc_attr_grp);
 799         usb_create_intf_ep_files(intf, udev);
 800         intf->sysfs_files_created = 1;
 801         return 0;
 802 }
 803
 804 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
 805 {
 806         struct device *dev = &intf->dev;
 807
 808         if (!intf->sysfs_files_created)
 809                 return;
 810         usb_remove_intf_ep_files(intf);
 811         device_remove_file(dev, &dev_attr_interface);
 812         sysfs_remove_group(&dev->kobj, &intf_attr_grp);
 813         sysfs_remove_group(&intf->dev.kobj, &intf_assoc_attr_grp);
 814         intf->sysfs_files_created = 0;
 815 }