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 #ifdef  CONFIG_PM
 184
 185 static const char power_group[] = "power";
 186
 187 static ssize_t
 188 show_persist(struct device *dev, struct device_attribute *attr, char *buf)
 189 {
 190         struct usb_device *udev = to_usb_device(dev);
 191
 192         return sprintf(buf, "%d\n", udev->persist_enabled);
 193 }
 194
 195 static ssize_t
 196 set_persist(struct device *dev, struct device_attribute *attr,
 197                 const char *buf, size_t count)
 198 {
 199         struct usb_device *udev = to_usb_device(dev);
 200         int value;
 201
 202         /* Hubs are always enabled for USB_PERSIST */
 203         if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
 204                 return -EPERM;
 205
 206         if (sscanf(buf, "%d", &value) != 1)
 207                 return -EINVAL;
 208         usb_pm_lock(udev);
 209         udev->persist_enabled = !!value;
 210         usb_pm_unlock(udev);
 211         return count;
 212 }
 213
 214 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
 215
 216 static int add_persist_attributes(struct device *dev)
 217 {
 218         int rc = 0;
 219
 220         if (is_usb_device(dev)) {
 221                 struct usb_device *udev = to_usb_device(dev);
 222
 223                 /* Hubs are automatically enabled for USB_PERSIST,
 224                  * no point in creating the attribute file.
 225                  */
 226                 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
 227                         rc = sysfs_add_file_to_group(&dev->kobj,
 228                                         &dev_attr_persist.attr,
 229                                         power_group);
 230         }
 231         return rc;
 232 }
 233
 234 static void remove_persist_attributes(struct device *dev)
 235 {
 236         sysfs_remove_file_from_group(&dev->kobj,
 237                         &dev_attr_persist.attr,
 238                         power_group);
 239 }
 240 #else
 241
 242 #define add_persist_attributes(dev)     0
 243 #define remove_persist_attributes(dev)  do {} while (0)
 244
 245 #endif  /* CONFIG_PM */
 246
 247 #ifdef  CONFIG_USB_SUSPEND
 248
 249 static ssize_t
 250 show_connected_duration(struct device *dev, struct device_attribute *attr,
 251                 char *buf)
 252 {
 253         struct usb_device *udev = to_usb_device(dev);
 254
 255         return sprintf(buf, "%u\n",
 256                         jiffies_to_msecs(jiffies - udev->connect_time));
 257 }
 258
 259 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
 260
 261 /*
 262  * If the device is resumed, the last time the device was suspended has
 263  * been pre-subtracted from active_duration.  We add the current time to
 264  * get the duration that the device was actually active.
 265  *
 266  * If the device is suspended, the active_duration is up-to-date.
 267  */
 268 static ssize_t
 269 show_active_duration(struct device *dev, struct device_attribute *attr,
 270                 char *buf)
 271 {
 272         struct usb_device *udev = to_usb_device(dev);
 273         int duration;
 274
 275         if (udev->state != USB_STATE_SUSPENDED)
 276                 duration = jiffies_to_msecs(jiffies + udev->active_duration);
 277         else
 278                 duration = jiffies_to_msecs(udev->active_duration);
 279         return sprintf(buf, "%u\n", duration);
 280 }
 281
 282 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
 283
 284 static ssize_t
 285 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
 286 {
 287         struct usb_device *udev = to_usb_device(dev);
 288
 289         return sprintf(buf, "%d\n", udev->autosuspend_delay / HZ);
 290 }
 291
 292 static ssize_t
 293 set_autosuspend(struct device *dev, struct device_attribute *attr,
 294                 const char *buf, size_t count)
 295 {
 296         struct usb_device *udev = to_usb_device(dev);
 297         int value;
 298
 299         if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/HZ ||
 300                         value <= - INT_MAX/HZ)
 301                 return -EINVAL;
 302         value *= HZ;
 303
 304         udev->autosuspend_delay = value;
 305         if (value >= 0)
 306                 usb_try_autosuspend_device(udev);
 307         else {
 308                 if (usb_autoresume_device(udev) == 0)
 309                         usb_autosuspend_device(udev);
 310         }
 311         return count;
 312 }
 313
 314 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
 315                 show_autosuspend, set_autosuspend);
 316
 317 static const char on_string[] = "on";
 318 static const char auto_string[] = "auto";
 319 static const char suspend_string[] = "suspend";
 320
 321 static ssize_t
 322 show_level(struct device *dev, struct device_attribute *attr, char *buf)
 323 {
 324         struct usb_device *udev = to_usb_device(dev);
 325         const char *p = auto_string;
 326
 327         if (udev->state == USB_STATE_SUSPENDED) {
 328                 if (udev->autoresume_disabled)
 329                         p = suspend_string;
 330         } else {
 331                 if (udev->autosuspend_disabled)
 332                         p = on_string;
 333         }
 334         return sprintf(buf, "%s\n", p);
 335 }
 336
 337 static ssize_t
 338 set_level(struct device *dev, struct device_attribute *attr,
 339                 const char *buf, size_t count)
 340 {
 341         struct usb_device *udev = to_usb_device(dev);
 342         int len = count;
 343         char *cp;
 344         int rc = 0;
 345         int old_autosuspend_disabled, old_autoresume_disabled;
 346
 347         cp = memchr(buf, '\n', count);
 348         if (cp)
 349                 len = cp - buf;
 350
 351         usb_lock_device(udev);
 352         old_autosuspend_disabled = udev->autosuspend_disabled;
 353         old_autoresume_disabled = udev->autoresume_disabled;
 354
 355         /* Setting the flags without calling usb_pm_lock is a subject to
 356          * races, but who cares...
 357          */
 358         if (len == sizeof on_string - 1 &&
 359                         strncmp(buf, on_string, len) == 0) {
 360                 udev->autosuspend_disabled = 1;
 361                 udev->autoresume_disabled = 0;
 362                 rc = usb_external_resume_device(udev);
 363
 364         } else if (len == sizeof auto_string - 1 &&
 365                         strncmp(buf, auto_string, len) == 0) {
 366                 udev->autosuspend_disabled = 0;
 367                 udev->autoresume_disabled = 0;
 368                 rc = usb_external_resume_device(udev);
 369
 370         } else if (len == sizeof suspend_string - 1 &&
 371                         strncmp(buf, suspend_string, len) == 0) {
 372                 udev->autosuspend_disabled = 0;
 373                 udev->autoresume_disabled = 1;
 374                 rc = usb_external_suspend_device(udev, PMSG_SUSPEND);
 375
 376         } else
 377                 rc = -EINVAL;
 378
 379         if (rc) {
 380                 udev->autosuspend_disabled = old_autosuspend_disabled;
 381                 udev->autoresume_disabled = old_autoresume_disabled;
 382         }
 383         usb_unlock_device(udev);
 384         return (rc < 0 ? rc : count);
 385 }
 386
 387 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
 388
 389 static int add_power_attributes(struct device *dev)
 390 {
 391         int rc = 0;
 392
 393         if (is_usb_device(dev)) {
 394                 rc = sysfs_add_file_to_group(&dev->kobj,
 395                                 &dev_attr_autosuspend.attr,
 396                                 power_group);
 397                 if (rc == 0)
 398                         rc = sysfs_add_file_to_group(&dev->kobj,
 399                                         &dev_attr_level.attr,
 400                                         power_group);
 401                 if (rc == 0)
 402                         rc = sysfs_add_file_to_group(&dev->kobj,
 403                                         &dev_attr_connected_duration.attr,
 404                                         power_group);
 405                 if (rc == 0)
 406                         rc = sysfs_add_file_to_group(&dev->kobj,
 407                                         &dev_attr_active_duration.attr,
 408                                         power_group);
 409         }
 410         return rc;
 411 }
 412
 413 static void remove_power_attributes(struct device *dev)
 414 {
 415         sysfs_remove_file_from_group(&dev->kobj,
 416                         &dev_attr_active_duration.attr,
 417                         power_group);
 418         sysfs_remove_file_from_group(&dev->kobj,
 419                         &dev_attr_connected_duration.attr,
 420                         power_group);
 421         sysfs_remove_file_from_group(&dev->kobj,
 422                         &dev_attr_level.attr,
 423                         power_group);
 424         sysfs_remove_file_from_group(&dev->kobj,
 425                         &dev_attr_autosuspend.attr,
 426                         power_group);
 427 }
 428
 429 #else
 430
 431 #define add_power_attributes(dev)       0
 432 #define remove_power_attributes(dev)    do {} while (0)
 433
 434 #endif  /* CONFIG_USB_SUSPEND */
 435
 436
 437 /* Descriptor fields */
 438 #define usb_descriptor_attr_le16(field, format_string)                  \
 439 static ssize_t                                                          \
 440 show_##field(struct device *dev, struct device_attribute *attr, \
 441                 char *buf)                                              \
 442 {                                                                       \
 443         struct usb_device *udev;                                        \
 444                                                                         \
 445         udev = to_usb_device(dev);                                      \
 446         return sprintf(buf, format_string,                              \
 447                         le16_to_cpu(udev->descriptor.field));           \
 448 }                                                                       \
 449 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 450
 451 usb_descriptor_attr_le16(idVendor, "%04x\n")
 452 usb_descriptor_attr_le16(idProduct, "%04x\n")
 453 usb_descriptor_attr_le16(bcdDevice, "%04x\n")
 454
 455 #define usb_descriptor_attr(field, format_string)                       \
 456 static ssize_t                                                          \
 457 show_##field(struct device *dev, struct device_attribute *attr, \
 458                 char *buf)                                              \
 459 {                                                                       \
 460         struct usb_device *udev;                                        \
 461                                                                         \
 462         udev = to_usb_device(dev);                                      \
 463         return sprintf(buf, format_string, udev->descriptor.field);     \
 464 }                                                                       \
 465 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 466
 467 usb_descriptor_attr(bDeviceClass, "%02x\n")
 468 usb_descriptor_attr(bDeviceSubClass, "%02x\n")
 469 usb_descriptor_attr(bDeviceProtocol, "%02x\n")
 470 usb_descriptor_attr(bNumConfigurations, "%d\n")
 471 usb_descriptor_attr(bMaxPacketSize0, "%d\n")
 472
 473
 474
 475 /* show if the device is authorized (1) or not (0) */
 476 static ssize_t usb_dev_authorized_show(struct device *dev,
 477                                        struct device_attribute *attr,
 478                                        char *buf)
 479 {
 480         struct usb_device *usb_dev = to_usb_device(dev);
 481         return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
 482 }
 483
 484
 485 /*
 486  * Authorize a device to be used in the system
 487  *
 488  * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
 489  */
 490 static ssize_t usb_dev_authorized_store(struct device *dev,
 491                                         struct device_attribute *attr,
 492                                         const char *buf, size_t size)
 493 {
 494         ssize_t result;
 495         struct usb_device *usb_dev = to_usb_device(dev);
 496         unsigned val;
 497         result = sscanf(buf, "%u\n", &val);
 498         if (result != 1)
 499                 result = -EINVAL;
 500         else if (val == 0)
 501                 result = usb_deauthorize_device(usb_dev);
 502         else
 503                 result = usb_authorize_device(usb_dev);
 504         return result < 0? result : size;
 505 }
 506
 507 static DEVICE_ATTR(authorized, 0644,
 508             usb_dev_authorized_show, usb_dev_authorized_store);
 509
 510
 511 static struct attribute *dev_attrs[] = {
 512         /* current configuration's attributes */
 513         &dev_attr_configuration.attr,
 514         &dev_attr_bNumInterfaces.attr,
 515         &dev_attr_bConfigurationValue.attr,
 516         &dev_attr_bmAttributes.attr,
 517         &dev_attr_bMaxPower.attr,
 518         &dev_attr_urbnum.attr,
 519         /* device attributes */
 520         &dev_attr_idVendor.attr,
 521         &dev_attr_idProduct.attr,
 522         &dev_attr_bcdDevice.attr,
 523         &dev_attr_bDeviceClass.attr,
 524         &dev_attr_bDeviceSubClass.attr,
 525         &dev_attr_bDeviceProtocol.attr,
 526         &dev_attr_bNumConfigurations.attr,
 527         &dev_attr_bMaxPacketSize0.attr,
 528         &dev_attr_speed.attr,
 529         &dev_attr_busnum.attr,
 530         &dev_attr_devnum.attr,
 531         &dev_attr_version.attr,
 532         &dev_attr_maxchild.attr,
 533         &dev_attr_quirks.attr,
 534         &dev_attr_authorized.attr,
 535         NULL,
 536 };
 537 static struct attribute_group dev_attr_grp = {
 538         .attrs = dev_attrs,
 539 };
 540
 541 /* When modifying this list, be sure to modify dev_string_attrs_are_visible()
 542  * accordingly.
 543  */
 544 static struct attribute *dev_string_attrs[] = {
 545         &dev_attr_manufacturer.attr,
 546         &dev_attr_product.attr,
 547         &dev_attr_serial.attr,
 548         NULL
 549 };
 550
 551 static mode_t dev_string_attrs_are_visible(struct kobject *kobj,
 552                 struct attribute *a, int n)
 553 {
 554         struct usb_device *udev = to_usb_device(
 555                         container_of(kobj, struct device, kobj));
 556
 557         if (a == &dev_attr_manufacturer.attr) {
 558                 if (udev->manufacturer == NULL)
 559                         return 0;
 560         } else if (a == &dev_attr_product.attr) {
 561                 if (udev->product == NULL)
 562                         return 0;
 563         } else if (a == &dev_attr_serial.attr) {
 564                 if (udev->serial == NULL)
 565                         return 0;
 566         }
 567         return a->mode;
 568 }
 569
 570 static struct attribute_group dev_string_attr_grp = {
 571         .attrs =        dev_string_attrs,
 572         .is_visible =   dev_string_attrs_are_visible,
 573 };
 574
 575 struct attribute_group *usb_device_groups[] = {
 576         &dev_attr_grp,
 577         &dev_string_attr_grp,
 578         NULL
 579 };
 580
 581 /* Binary descriptors */
 582
 583 static ssize_t
 584 read_descriptors(struct kobject *kobj, struct bin_attribute *attr,
 585                 char *buf, loff_t off, size_t count)
 586 {
 587         struct usb_device *udev = to_usb_device(
 588                         container_of(kobj, struct device, kobj));
 589         size_t nleft = count;
 590         size_t srclen, n;
 591         int cfgno;
 592         void *src;
 593
 594         /* The binary attribute begins with the device descriptor.
 595          * Following that are the raw descriptor entries for all the
 596          * configurations (config plus subsidiary descriptors).
 597          */
 598         for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
 599                         nleft > 0; ++cfgno) {
 600                 if (cfgno < 0) {
 601                         src = &udev->descriptor;
 602                         srclen = sizeof(struct usb_device_descriptor);
 603                 } else {
 604                         src = udev->rawdescriptors[cfgno];
 605                         srclen = __le16_to_cpu(udev->config[cfgno].desc.
 606                                         wTotalLength);
 607                 }
 608                 if (off < srclen) {
 609                         n = min(nleft, srclen - (size_t) off);
 610                         memcpy(buf, src + off, n);
 611                         nleft -= n;
 612                         buf += n;
 613                         off = 0;
 614                 } else {
 615                         off -= srclen;
 616                 }
 617         }
 618         return count - nleft;
 619 }
 620
 621 static struct bin_attribute dev_bin_attr_descriptors = {
 622         .attr = {.name = "descriptors", .mode = 0444},
 623         .read = read_descriptors,
 624         .size = 18 + 65535,     /* dev descr + max-size raw descriptor */
 625 };
 626
 627 int usb_create_sysfs_dev_files(struct usb_device *udev)
 628 {
 629         struct device *dev = &udev->dev;
 630         int retval;
 631
 632         /* Unforunately these attributes cannot be created before
 633          * the uevent is broadcast.
 634          */
 635         retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
 636         if (retval)
 637                 goto error;
 638
 639         retval = add_persist_attributes(dev);
 640         if (retval)
 641                 goto error;
 642
 643         retval = add_power_attributes(dev);
 644         if (retval)
 645                 goto error;
 646
 647         retval = usb_create_ep_files(dev, &udev->ep0, udev);
 648         if (retval)
 649                 goto error;
 650         return 0;
 651 error:
 652         usb_remove_sysfs_dev_files(udev);
 653         return retval;
 654 }
 655
 656 void usb_remove_sysfs_dev_files(struct usb_device *udev)
 657 {
 658         struct device *dev = &udev->dev;
 659
 660         usb_remove_ep_files(&udev->ep0);
 661         remove_power_attributes(dev);
 662         remove_persist_attributes(dev);
 663         device_remove_bin_file(dev, &dev_bin_attr_descriptors);
 664 }
 665
 666 /* Interface Accociation Descriptor fields */
 667 #define usb_intf_assoc_attr(field, format_string)                       \
 668 static ssize_t                                                          \
 669 show_iad_##field(struct device *dev, struct device_attribute *attr,     \
 670                 char *buf)                                              \
 671 {                                                                       \
 672         struct usb_interface *intf = to_usb_interface(dev);             \
 673                                                                         \
 674         return sprintf(buf, format_string,                              \
 675                         intf->intf_assoc->field);                       \
 676 }                                                                       \
 677 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
 678
 679 usb_intf_assoc_attr(bFirstInterface, "%02x\n")
 680 usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
 681 usb_intf_assoc_attr(bFunctionClass, "%02x\n")
 682 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
 683 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
 684
 685 /* Interface fields */
 686 #define usb_intf_attr(field, format_string)                             \
 687 static ssize_t                                                          \
 688 show_##field(struct device *dev, struct device_attribute *attr, \
 689                 char *buf)                                              \
 690 {                                                                       \
 691         struct usb_interface *intf = to_usb_interface(dev);             \
 692                                                                         \
 693         return sprintf(buf, format_string,                              \
 694                         intf->cur_altsetting->desc.field);              \
 695 }                                                                       \
 696 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 697
 698 usb_intf_attr(bInterfaceNumber, "%02x\n")
 699 usb_intf_attr(bAlternateSetting, "%2d\n")
 700 usb_intf_attr(bNumEndpoints, "%02x\n")
 701 usb_intf_attr(bInterfaceClass, "%02x\n")
 702 usb_intf_attr(bInterfaceSubClass, "%02x\n")
 703 usb_intf_attr(bInterfaceProtocol, "%02x\n")
 704
 705 static ssize_t show_interface_string(struct device *dev,
 706                 struct device_attribute *attr, char *buf)
 707 {
 708         struct usb_interface *intf;
 709         char *string;
 710
 711         intf = to_usb_interface(dev);
 712         string = intf->cur_altsetting->string;
 713         barrier();              /* The altsetting might change! */
 714
 715         if (!string)
 716                 return 0;
 717         return sprintf(buf, "%s\n", string);
 718 }
 719 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
 720
 721 static ssize_t show_modalias(struct device *dev,
 722                 struct device_attribute *attr, char *buf)
 723 {
 724         struct usb_interface *intf;
 725         struct usb_device *udev;
 726         struct usb_host_interface *alt;
 727
 728         intf = to_usb_interface(dev);
 729         udev = interface_to_usbdev(intf);
 730         alt = intf->cur_altsetting;
 731
 732         return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
 733                         "ic%02Xisc%02Xip%02X\n",
 734                         le16_to_cpu(udev->descriptor.idVendor),
 735                         le16_to_cpu(udev->descriptor.idProduct),
 736                         le16_to_cpu(udev->descriptor.bcdDevice),
 737                         udev->descriptor.bDeviceClass,
 738                         udev->descriptor.bDeviceSubClass,
 739                         udev->descriptor.bDeviceProtocol,
 740                         alt->desc.bInterfaceClass,
 741                         alt->desc.bInterfaceSubClass,
 742                         alt->desc.bInterfaceProtocol);
 743 }
 744 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
 745
 746 static struct attribute *intf_attrs[] = {
 747         &dev_attr_bInterfaceNumber.attr,
 748         &dev_attr_bAlternateSetting.attr,
 749         &dev_attr_bNumEndpoints.attr,
 750         &dev_attr_bInterfaceClass.attr,
 751         &dev_attr_bInterfaceSubClass.attr,
 752         &dev_attr_bInterfaceProtocol.attr,
 753         &dev_attr_modalias.attr,
 754         NULL,
 755 };
 756 static struct attribute_group intf_attr_grp = {
 757         .attrs = intf_attrs,
 758 };
 759
 760 static struct attribute *intf_assoc_attrs[] = {
 761         &dev_attr_iad_bFirstInterface.attr,
 762         &dev_attr_iad_bInterfaceCount.attr,
 763         &dev_attr_iad_bFunctionClass.attr,
 764         &dev_attr_iad_bFunctionSubClass.attr,
 765         &dev_attr_iad_bFunctionProtocol.attr,
 766         NULL,
 767 };
 768
 769 static mode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
 770                 struct attribute *a, int n)
 771 {
 772         struct usb_interface *intf = to_usb_interface(
 773                         container_of(kobj, struct device, kobj));
 774
 775         if (intf->intf_assoc == NULL)
 776                 return 0;
 777         return a->mode;
 778 }
 779
 780 static struct attribute_group intf_assoc_attr_grp = {
 781         .attrs =        intf_assoc_attrs,
 782         .is_visible =   intf_assoc_attrs_are_visible,
 783 };
 784
 785 struct attribute_group *usb_interface_groups[] = {
 786         &intf_attr_grp,
 787         &intf_assoc_attr_grp,
 788         NULL
 789 };
 790
 791 static inline void usb_create_intf_ep_files(struct usb_interface *intf,
 792                 struct usb_device *udev)
 793 {
 794         struct usb_host_interface *iface_desc;
 795         int i;
 796
 797         iface_desc = intf->cur_altsetting;
 798         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
 799                 usb_create_ep_files(&intf->dev, &iface_desc->endpoint[i],
 800                                 udev);
 801 }
 802
 803 static inline void usb_remove_intf_ep_files(struct usb_interface *intf)
 804 {
 805         struct usb_host_interface *iface_desc;
 806         int i;
 807
 808         iface_desc = intf->cur_altsetting;
 809         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
 810                 usb_remove_ep_files(&iface_desc->endpoint[i]);
 811 }
 812
 813 int usb_create_sysfs_intf_files(struct usb_interface *intf)
 814 {
 815         struct usb_device *udev = interface_to_usbdev(intf);
 816         struct usb_host_interface *alt = intf->cur_altsetting;
 817         int retval;
 818
 819         if (intf->sysfs_files_created)
 820                 return 0;
 821
 822         /* The interface string may be present in some altsettings
 823          * and missing in others.  Hence its attribute cannot be created
 824          * before the uevent is broadcast.
 825          */
 826         if (alt->string == NULL)
 827                 alt->string = usb_cache_string(udev, alt->desc.iInterface);
 828         if (alt->string)
 829                 retval = device_create_file(&intf->dev, &dev_attr_interface);
 830         usb_create_intf_ep_files(intf, udev);
 831         intf->sysfs_files_created = 1;
 832         return 0;
 833 }
 834
 835 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
 836 {
 837         struct device *dev = &intf->dev;
 838
 839         if (!intf->sysfs_files_created)
 840                 return;
 841         usb_remove_intf_ep_files(intf);
 842         device_remove_file(dev, &dev_attr_interface);
 843         intf->sysfs_files_created = 0;
 844 }