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_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,
  77                 show_bConfigurationValue, set_bConfigurationValue);
  78
  79 /* String fields */
  80 #define usb_string_attr(name)                                           \
  81 static ssize_t  show_##name(struct device *dev,                         \
  82                 struct device_attribute *attr, char *buf)               \
  83 {                                                                       \
  84         struct usb_device *udev;                                        \
  85         int retval;                                                     \
  86                                                                         \
  87         udev = to_usb_device(dev);                                      \
  88         usb_lock_device(udev);                                          \
  89         retval = sprintf(buf, "%s\n", udev->name);                      \
  90         usb_unlock_device(udev);                                        \
  91         return retval;                                                  \
  92 }                                                                       \
  93 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
  94
  95 usb_string_attr(product);
  96 usb_string_attr(manufacturer);
  97 usb_string_attr(serial);
  98
  99 static ssize_t
 100 show_speed(struct device *dev, struct device_attribute *attr, char *buf)
 101 {
 102         struct usb_device *udev;
 103         char *speed;
 104
 105         udev = to_usb_device(dev);
 106
 107         switch (udev->speed) {
 108         case USB_SPEED_LOW:
 109                 speed = "1.5";
 110                 break;
 111         case USB_SPEED_UNKNOWN:
 112         case USB_SPEED_FULL:
 113                 speed = "12";
 114                 break;
 115         case USB_SPEED_HIGH:
 116                 speed = "480";
 117                 break;
 118         case USB_SPEED_WIRELESS:
 119                 speed = "480";
 120                 break;
 121         case USB_SPEED_SUPER:
 122                 speed = "5000";
 123                 break;
 124         default:
 125                 speed = "unknown";
 126         }
 127         return sprintf(buf, "%s\n", speed);
 128 }
 129 static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL);
 130
 131 static ssize_t
 132 show_busnum(struct device *dev, struct device_attribute *attr, char *buf)
 133 {
 134         struct usb_device *udev;
 135
 136         udev = to_usb_device(dev);
 137         return sprintf(buf, "%d\n", udev->bus->busnum);
 138 }
 139 static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL);
 140
 141 static ssize_t
 142 show_devnum(struct device *dev, struct device_attribute *attr, char *buf)
 143 {
 144         struct usb_device *udev;
 145
 146         udev = to_usb_device(dev);
 147         return sprintf(buf, "%d\n", udev->devnum);
 148 }
 149 static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL);
 150
 151 static ssize_t
 152 show_devpath(struct device *dev, struct device_attribute *attr, char *buf)
 153 {
 154         struct usb_device *udev;
 155
 156         udev = to_usb_device(dev);
 157         return sprintf(buf, "%s\n", udev->devpath);
 158 }
 159 static DEVICE_ATTR(devpath, S_IRUGO, show_devpath, NULL);
 160
 161 static ssize_t
 162 show_version(struct device *dev, struct device_attribute *attr, char *buf)
 163 {
 164         struct usb_device *udev;
 165         u16 bcdUSB;
 166
 167         udev = to_usb_device(dev);
 168         bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
 169         return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
 170 }
 171 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
 172
 173 static ssize_t
 174 show_maxchild(struct device *dev, struct device_attribute *attr, char *buf)
 175 {
 176         struct usb_device *udev;
 177
 178         udev = to_usb_device(dev);
 179         return sprintf(buf, "%d\n", udev->maxchild);
 180 }
 181 static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL);
 182
 183 static ssize_t
 184 show_quirks(struct device *dev, struct device_attribute *attr, char *buf)
 185 {
 186         struct usb_device *udev;
 187
 188         udev = to_usb_device(dev);
 189         return sprintf(buf, "0x%x\n", udev->quirks);
 190 }
 191 static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);
 192
 193 static ssize_t
 194 show_avoid_reset_quirk(struct device *dev, struct device_attribute *attr, char *buf)
 195 {
 196         struct usb_device *udev;
 197
 198         udev = to_usb_device(dev);
 199         return sprintf(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET_MORPHS));
 200 }
 201
 202 static ssize_t
 203 set_avoid_reset_quirk(struct device *dev, struct device_attribute *attr,
 204                 const char *buf, size_t count)
 205 {
 206         struct usb_device       *udev = to_usb_device(dev);
 207         int                     config;
 208
 209         if (sscanf(buf, "%d", &config) != 1 || config < 0 || config > 1)
 210                 return -EINVAL;
 211         usb_lock_device(udev);
 212         if (config)
 213                 udev->quirks |= USB_QUIRK_RESET_MORPHS;
 214         else
 215                 udev->quirks &= ~USB_QUIRK_RESET_MORPHS;
 216         usb_unlock_device(udev);
 217         return count;
 218 }
 219
 220 static DEVICE_ATTR(avoid_reset_quirk, S_IRUGO | S_IWUSR,
 221                 show_avoid_reset_quirk, set_avoid_reset_quirk);
 222
 223 static ssize_t
 224 show_urbnum(struct device *dev, struct device_attribute *attr, char *buf)
 225 {
 226         struct usb_device *udev;
 227
 228         udev = to_usb_device(dev);
 229         return sprintf(buf, "%d\n", atomic_read(&udev->urbnum));
 230 }
 231 static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL);
 232
 233 static ssize_t
 234 show_removable(struct device *dev, struct device_attribute *attr, char *buf)
 235 {
 236         struct usb_device *udev;
 237         char *state;
 238
 239         udev = to_usb_device(dev);
 240
 241         switch (udev->removable) {
 242         case USB_DEVICE_REMOVABLE:
 243                 state = "removable";
 244                 break;
 245         case USB_DEVICE_FIXED:
 246                 state = "fixed";
 247                 break;
 248         default:
 249                 state = "unknown";
 250         }
 251
 252         return sprintf(buf, "%s\n", state);
 253 }
 254 static DEVICE_ATTR(removable, S_IRUGO, show_removable, NULL);
 255
 256 #ifdef  CONFIG_PM
 257
 258 static ssize_t
 259 show_persist(struct device *dev, struct device_attribute *attr, char *buf)
 260 {
 261         struct usb_device *udev = to_usb_device(dev);
 262
 263         return sprintf(buf, "%d\n", udev->persist_enabled);
 264 }
 265
 266 static ssize_t
 267 set_persist(struct device *dev, struct device_attribute *attr,
 268                 const char *buf, size_t count)
 269 {
 270         struct usb_device *udev = to_usb_device(dev);
 271         int value;
 272
 273         /* Hubs are always enabled for USB_PERSIST */
 274         if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
 275                 return -EPERM;
 276
 277         if (sscanf(buf, "%d", &value) != 1)
 278                 return -EINVAL;
 279
 280         usb_lock_device(udev);
 281         udev->persist_enabled = !!value;
 282         usb_unlock_device(udev);
 283         return count;
 284 }
 285
 286 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
 287
 288 static int add_persist_attributes(struct device *dev)
 289 {
 290         int rc = 0;
 291
 292         if (is_usb_device(dev)) {
 293                 struct usb_device *udev = to_usb_device(dev);
 294
 295                 /* Hubs are automatically enabled for USB_PERSIST,
 296                  * no point in creating the attribute file.
 297                  */
 298                 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
 299                         rc = sysfs_add_file_to_group(&dev->kobj,
 300                                         &dev_attr_persist.attr,
 301                                         power_group_name);
 302         }
 303         return rc;
 304 }
 305
 306 static void remove_persist_attributes(struct device *dev)
 307 {
 308         sysfs_remove_file_from_group(&dev->kobj,
 309                         &dev_attr_persist.attr,
 310                         power_group_name);
 311 }
 312 #else
 313
 314 #define add_persist_attributes(dev)     0
 315 #define remove_persist_attributes(dev)  do {} while (0)
 316
 317 #endif  /* CONFIG_PM */
 318
 319 #ifdef  CONFIG_USB_SUSPEND
 320
 321 static ssize_t
 322 show_connected_duration(struct device *dev, struct device_attribute *attr,
 323                 char *buf)
 324 {
 325         struct usb_device *udev = to_usb_device(dev);
 326
 327         return sprintf(buf, "%u\n",
 328                         jiffies_to_msecs(jiffies - udev->connect_time));
 329 }
 330
 331 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
 332
 333 /*
 334  * If the device is resumed, the last time the device was suspended has
 335  * been pre-subtracted from active_duration.  We add the current time to
 336  * get the duration that the device was actually active.
 337  *
 338  * If the device is suspended, the active_duration is up-to-date.
 339  */
 340 static ssize_t
 341 show_active_duration(struct device *dev, struct device_attribute *attr,
 342                 char *buf)
 343 {
 344         struct usb_device *udev = to_usb_device(dev);
 345         int duration;
 346
 347         if (udev->state != USB_STATE_SUSPENDED)
 348                 duration = jiffies_to_msecs(jiffies + udev->active_duration);
 349         else
 350                 duration = jiffies_to_msecs(udev->active_duration);
 351         return sprintf(buf, "%u\n", duration);
 352 }
 353
 354 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
 355
 356 static ssize_t
 357 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
 358 {
 359         return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000);
 360 }
 361
 362 static ssize_t
 363 set_autosuspend(struct device *dev, struct device_attribute *attr,
 364                 const char *buf, size_t count)
 365 {
 366         int value;
 367
 368         if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
 369                         value <= -INT_MAX/1000)
 370                 return -EINVAL;
 371
 372         pm_runtime_set_autosuspend_delay(dev, value * 1000);
 373         return count;
 374 }
 375
 376 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
 377                 show_autosuspend, set_autosuspend);
 378
 379 static const char on_string[] = "on";
 380 static const char auto_string[] = "auto";
 381
 382 static void warn_level(void) {
 383         static int level_warned;
 384
 385         if (!level_warned) {
 386                 level_warned = 1;
 387                 printk(KERN_WARNING "WARNING! power/level is deprecated; "
 388                                 "use power/control instead\n");
 389         }
 390 }
 391
 392 static ssize_t
 393 show_level(struct device *dev, struct device_attribute *attr, char *buf)
 394 {
 395         struct usb_device *udev = to_usb_device(dev);
 396         const char *p = auto_string;
 397
 398         warn_level();
 399         if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
 400                 p = on_string;
 401         return sprintf(buf, "%s\n", p);
 402 }
 403
 404 static ssize_t
 405 set_level(struct device *dev, struct device_attribute *attr,
 406                 const char *buf, size_t count)
 407 {
 408         struct usb_device *udev = to_usb_device(dev);
 409         int len = count;
 410         char *cp;
 411         int rc = count;
 412
 413         warn_level();
 414         cp = memchr(buf, '\n', count);
 415         if (cp)
 416                 len = cp - buf;
 417
 418         usb_lock_device(udev);
 419
 420         if (len == sizeof on_string - 1 &&
 421                         strncmp(buf, on_string, len) == 0)
 422                 usb_disable_autosuspend(udev);
 423
 424         else if (len == sizeof auto_string - 1 &&
 425                         strncmp(buf, auto_string, len) == 0)
 426                 usb_enable_autosuspend(udev);
 427
 428         else
 429                 rc = -EINVAL;
 430
 431         usb_unlock_device(udev);
 432         return rc;
 433 }
 434
 435 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
 436
 437 static ssize_t
 438 show_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr,
 439                                 char *buf)
 440 {
 441         struct usb_device *udev = to_usb_device(dev);
 442         const char *p;
 443
 444         if (udev->usb2_hw_lpm_enabled == 1)
 445                 p = "enabled";
 446         else
 447                 p = "disabled";
 448
 449         return sprintf(buf, "%s\n", p);
 450 }
 451
 452 static ssize_t
 453 set_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr,
 454                 const char *buf, size_t count)
 455 {
 456         struct usb_device *udev = to_usb_device(dev);
 457         bool value;
 458         int ret;
 459
 460         usb_lock_device(udev);
 461
 462         ret = strtobool(buf, &value);
 463
 464         if (!ret)
 465                 ret = usb_set_usb2_hardware_lpm(udev, value);
 466
 467         usb_unlock_device(udev);
 468
 469         if (!ret)
 470                 return count;
 471
 472         return ret;
 473 }
 474
 475 static DEVICE_ATTR(usb2_hardware_lpm, S_IRUGO | S_IWUSR, show_usb2_hardware_lpm,
 476                         set_usb2_hardware_lpm);
 477
 478 static struct attribute *usb2_hardware_lpm_attr[] = {
 479         &dev_attr_usb2_hardware_lpm.attr,
 480         NULL,
 481 };
 482 static struct attribute_group usb2_hardware_lpm_attr_group = {
 483         .name   = power_group_name,
 484         .attrs  = usb2_hardware_lpm_attr,
 485 };
 486
 487 static struct attribute *power_attrs[] = {
 488         &dev_attr_autosuspend.attr,
 489         &dev_attr_level.attr,
 490         &dev_attr_connected_duration.attr,
 491         &dev_attr_active_duration.attr,
 492         NULL,
 493 };
 494 static struct attribute_group power_attr_group = {
 495         .name   = power_group_name,
 496         .attrs  = power_attrs,
 497 };
 498
 499 static int add_power_attributes(struct device *dev)
 500 {
 501         int rc = 0;
 502
 503         if (is_usb_device(dev)) {
 504                 struct usb_device *udev = to_usb_device(dev);
 505                 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
 506                 if (udev->usb2_hw_lpm_capable == 1)
 507                         rc = sysfs_merge_group(&dev->kobj,
 508                                         &usb2_hardware_lpm_attr_group);
 509         }
 510
 511         return rc;
 512 }
 513
 514 static void remove_power_attributes(struct device *dev)
 515 {
 516         sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
 517         sysfs_unmerge_group(&dev->kobj, &power_attr_group);
 518 }
 519
 520 #else
 521
 522 #define add_power_attributes(dev)       0
 523 #define remove_power_attributes(dev)    do {} while (0)
 524
 525 #endif  /* CONFIG_USB_SUSPEND */
 526
 527
 528 /* Descriptor fields */
 529 #define usb_descriptor_attr_le16(field, format_string)                  \
 530 static ssize_t                                                          \
 531 show_##field(struct device *dev, struct device_attribute *attr, \
 532                 char *buf)                                              \
 533 {                                                                       \
 534         struct usb_device *udev;                                        \
 535                                                                         \
 536         udev = to_usb_device(dev);                                      \
 537         return sprintf(buf, format_string,                              \
 538                         le16_to_cpu(udev->descriptor.field));           \
 539 }                                                                       \
 540 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 541
 542 usb_descriptor_attr_le16(idVendor, "%04x\n")
 543 usb_descriptor_attr_le16(idProduct, "%04x\n")
 544 usb_descriptor_attr_le16(bcdDevice, "%04x\n")
 545
 546 #define usb_descriptor_attr(field, format_string)                       \
 547 static ssize_t                                                          \
 548 show_##field(struct device *dev, struct device_attribute *attr, \
 549                 char *buf)                                              \
 550 {                                                                       \
 551         struct usb_device *udev;                                        \
 552                                                                         \
 553         udev = to_usb_device(dev);                                      \
 554         return sprintf(buf, format_string, udev->descriptor.field);     \
 555 }                                                                       \
 556 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 557
 558 usb_descriptor_attr(bDeviceClass, "%02x\n")
 559 usb_descriptor_attr(bDeviceSubClass, "%02x\n")
 560 usb_descriptor_attr(bDeviceProtocol, "%02x\n")
 561 usb_descriptor_attr(bNumConfigurations, "%d\n")
 562 usb_descriptor_attr(bMaxPacketSize0, "%d\n")
 563
 564
 565
 566 /* show if the device is authorized (1) or not (0) */
 567 static ssize_t usb_dev_authorized_show(struct device *dev,
 568                                        struct device_attribute *attr,
 569                                        char *buf)
 570 {
 571         struct usb_device *usb_dev = to_usb_device(dev);
 572         return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
 573 }
 574
 575
 576 /*
 577  * Authorize a device to be used in the system
 578  *
 579  * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
 580  */
 581 static ssize_t usb_dev_authorized_store(struct device *dev,
 582                                         struct device_attribute *attr,
 583                                         const char *buf, size_t size)
 584 {
 585         ssize_t result;
 586         struct usb_device *usb_dev = to_usb_device(dev);
 587         unsigned val;
 588         result = sscanf(buf, "%u\n", &val);
 589         if (result != 1)
 590                 result = -EINVAL;
 591         else if (val == 0)
 592                 result = usb_deauthorize_device(usb_dev);
 593         else
 594                 result = usb_authorize_device(usb_dev);
 595         return result < 0? result : size;
 596 }
 597
 598 static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, 0644,
 599             usb_dev_authorized_show, usb_dev_authorized_store);
 600
 601 /* "Safely remove a device" */
 602 static ssize_t usb_remove_store(struct device *dev,
 603                 struct device_attribute *attr,
 604                 const char *buf, size_t count)
 605 {
 606         struct usb_device *udev = to_usb_device(dev);
 607         int rc = 0;
 608
 609         usb_lock_device(udev);
 610         if (udev->state != USB_STATE_NOTATTACHED) {
 611
 612                 /* To avoid races, first unconfigure and then remove */
 613                 usb_set_configuration(udev, -1);
 614                 rc = usb_remove_device(udev);
 615         }
 616         if (rc == 0)
 617                 rc = count;
 618         usb_unlock_device(udev);
 619         return rc;
 620 }
 621 static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0200, NULL, usb_remove_store);
 622
 623
 624 static struct attribute *dev_attrs[] = {
 625         /* current configuration's attributes */
 626         &dev_attr_configuration.attr,
 627         &dev_attr_bNumInterfaces.attr,
 628         &dev_attr_bConfigurationValue.attr,
 629         &dev_attr_bmAttributes.attr,
 630         &dev_attr_bMaxPower.attr,
 631         /* device attributes */
 632         &dev_attr_urbnum.attr,
 633         &dev_attr_idVendor.attr,
 634         &dev_attr_idProduct.attr,
 635         &dev_attr_bcdDevice.attr,
 636         &dev_attr_bDeviceClass.attr,
 637         &dev_attr_bDeviceSubClass.attr,
 638         &dev_attr_bDeviceProtocol.attr,
 639         &dev_attr_bNumConfigurations.attr,
 640         &dev_attr_bMaxPacketSize0.attr,
 641         &dev_attr_speed.attr,
 642         &dev_attr_busnum.attr,
 643         &dev_attr_devnum.attr,
 644         &dev_attr_devpath.attr,
 645         &dev_attr_version.attr,
 646         &dev_attr_maxchild.attr,
 647         &dev_attr_quirks.attr,
 648         &dev_attr_avoid_reset_quirk.attr,
 649         &dev_attr_authorized.attr,
 650         &dev_attr_remove.attr,
 651         &dev_attr_removable.attr,
 652         NULL,
 653 };
 654 static struct attribute_group dev_attr_grp = {
 655         .attrs = dev_attrs,
 656 };
 657
 658 /* When modifying this list, be sure to modify dev_string_attrs_are_visible()
 659  * accordingly.
 660  */
 661 static struct attribute *dev_string_attrs[] = {
 662         &dev_attr_manufacturer.attr,
 663         &dev_attr_product.attr,
 664         &dev_attr_serial.attr,
 665         NULL
 666 };
 667
 668 static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
 669                 struct attribute *a, int n)
 670 {
 671         struct device *dev = container_of(kobj, struct device, kobj);
 672         struct usb_device *udev = to_usb_device(dev);
 673
 674         if (a == &dev_attr_manufacturer.attr) {
 675                 if (udev->manufacturer == NULL)
 676                         return 0;
 677         } else if (a == &dev_attr_product.attr) {
 678                 if (udev->product == NULL)
 679                         return 0;
 680         } else if (a == &dev_attr_serial.attr) {
 681                 if (udev->serial == NULL)
 682                         return 0;
 683         }
 684         return a->mode;
 685 }
 686
 687 static struct attribute_group dev_string_attr_grp = {
 688         .attrs =        dev_string_attrs,
 689         .is_visible =   dev_string_attrs_are_visible,
 690 };
 691
 692 const struct attribute_group *usb_device_groups[] = {
 693         &dev_attr_grp,
 694         &dev_string_attr_grp,
 695         NULL
 696 };
 697
 698 /* Binary descriptors */
 699
 700 static ssize_t
 701 read_descriptors(struct file *filp, struct kobject *kobj,
 702                 struct bin_attribute *attr,
 703                 char *buf, loff_t off, size_t count)
 704 {
 705         struct device *dev = container_of(kobj, struct device, kobj);
 706         struct usb_device *udev = to_usb_device(dev);
 707         size_t nleft = count;
 708         size_t srclen, n;
 709         int cfgno;
 710         void *src;
 711
 712         /* The binary attribute begins with the device descriptor.
 713          * Following that are the raw descriptor entries for all the
 714          * configurations (config plus subsidiary descriptors).
 715          */
 716         for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
 717                         nleft > 0; ++cfgno) {
 718                 if (cfgno < 0) {
 719                         src = &udev->descriptor;
 720                         srclen = sizeof(struct usb_device_descriptor);
 721                 } else {
 722                         src = udev->rawdescriptors[cfgno];
 723                         srclen = __le16_to_cpu(udev->config[cfgno].desc.
 724                                         wTotalLength);
 725                 }
 726                 if (off < srclen) {
 727                         n = min(nleft, srclen - (size_t) off);
 728                         memcpy(buf, src + off, n);
 729                         nleft -= n;
 730                         buf += n;
 731                         off = 0;
 732                 } else {
 733                         off -= srclen;
 734                 }
 735         }
 736         return count - nleft;
 737 }
 738
 739 static struct bin_attribute dev_bin_attr_descriptors = {
 740         .attr = {.name = "descriptors", .mode = 0444},
 741         .read = read_descriptors,
 742         .size = 18 + 65535,     /* dev descr + max-size raw descriptor */
 743 };
 744
 745 int usb_create_sysfs_dev_files(struct usb_device *udev)
 746 {
 747         struct device *dev = &udev->dev;
 748         int retval;
 749
 750         retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
 751         if (retval)
 752                 goto error;
 753
 754         retval = add_persist_attributes(dev);
 755         if (retval)
 756                 goto error;
 757
 758         retval = add_power_attributes(dev);
 759         if (retval)
 760                 goto error;
 761         return retval;
 762 error:
 763         usb_remove_sysfs_dev_files(udev);
 764         return retval;
 765 }
 766
 767 void usb_remove_sysfs_dev_files(struct usb_device *udev)
 768 {
 769         struct device *dev = &udev->dev;
 770
 771         remove_power_attributes(dev);
 772         remove_persist_attributes(dev);
 773         device_remove_bin_file(dev, &dev_bin_attr_descriptors);
 774 }
 775
 776 /* Interface Accociation Descriptor fields */
 777 #define usb_intf_assoc_attr(field, format_string)                       \
 778 static ssize_t                                                          \
 779 show_iad_##field(struct device *dev, struct device_attribute *attr,     \
 780                 char *buf)                                              \
 781 {                                                                       \
 782         struct usb_interface *intf = to_usb_interface(dev);             \
 783                                                                         \
 784         return sprintf(buf, format_string,                              \
 785                         intf->intf_assoc->field);                       \
 786 }                                                                       \
 787 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
 788
 789 usb_intf_assoc_attr(bFirstInterface, "%02x\n")
 790 usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
 791 usb_intf_assoc_attr(bFunctionClass, "%02x\n")
 792 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
 793 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
 794
 795 /* Interface fields */
 796 #define usb_intf_attr(field, format_string)                             \
 797 static ssize_t                                                          \
 798 show_##field(struct device *dev, struct device_attribute *attr, \
 799                 char *buf)                                              \
 800 {                                                                       \
 801         struct usb_interface *intf = to_usb_interface(dev);             \
 802                                                                         \
 803         return sprintf(buf, format_string,                              \
 804                         intf->cur_altsetting->desc.field);              \
 805 }                                                                       \
 806 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 807
 808 usb_intf_attr(bInterfaceNumber, "%02x\n")
 809 usb_intf_attr(bAlternateSetting, "%2d\n")
 810 usb_intf_attr(bNumEndpoints, "%02x\n")
 811 usb_intf_attr(bInterfaceClass, "%02x\n")
 812 usb_intf_attr(bInterfaceSubClass, "%02x\n")
 813 usb_intf_attr(bInterfaceProtocol, "%02x\n")
 814
 815 static ssize_t show_interface_string(struct device *dev,
 816                 struct device_attribute *attr, char *buf)
 817 {
 818         struct usb_interface *intf;
 819         char *string;
 820
 821         intf = to_usb_interface(dev);
 822         string = intf->cur_altsetting->string;
 823         barrier();              /* The altsetting might change! */
 824
 825         if (!string)
 826                 return 0;
 827         return sprintf(buf, "%s\n", string);
 828 }
 829 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
 830
 831 static ssize_t show_modalias(struct device *dev,
 832                 struct device_attribute *attr, char *buf)
 833 {
 834         struct usb_interface *intf;
 835         struct usb_device *udev;
 836         struct usb_host_interface *alt;
 837
 838         intf = to_usb_interface(dev);
 839         udev = interface_to_usbdev(intf);
 840         alt = intf->cur_altsetting;
 841
 842         return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
 843                         "ic%02Xisc%02Xip%02X\n",
 844                         le16_to_cpu(udev->descriptor.idVendor),
 845                         le16_to_cpu(udev->descriptor.idProduct),
 846                         le16_to_cpu(udev->descriptor.bcdDevice),
 847                         udev->descriptor.bDeviceClass,
 848                         udev->descriptor.bDeviceSubClass,
 849                         udev->descriptor.bDeviceProtocol,
 850                         alt->desc.bInterfaceClass,
 851                         alt->desc.bInterfaceSubClass,
 852                         alt->desc.bInterfaceProtocol);
 853 }
 854 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
 855
 856 static ssize_t show_supports_autosuspend(struct device *dev,
 857                 struct device_attribute *attr, char *buf)
 858 {
 859         struct usb_interface *intf;
 860         struct usb_device *udev;
 861         int ret;
 862
 863         intf = to_usb_interface(dev);
 864         udev = interface_to_usbdev(intf);
 865
 866         usb_lock_device(udev);
 867         /* Devices will be autosuspended even when an interface isn't claimed */
 868         if (!intf->dev.driver ||
 869                         to_usb_driver(intf->dev.driver)->supports_autosuspend)
 870                 ret = sprintf(buf, "%u\n", 1);
 871         else
 872                 ret = sprintf(buf, "%u\n", 0);
 873         usb_unlock_device(udev);
 874
 875         return ret;
 876 }
 877 static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
 878
 879 static struct attribute *intf_attrs[] = {
 880         &dev_attr_bInterfaceNumber.attr,
 881         &dev_attr_bAlternateSetting.attr,
 882         &dev_attr_bNumEndpoints.attr,
 883         &dev_attr_bInterfaceClass.attr,
 884         &dev_attr_bInterfaceSubClass.attr,
 885         &dev_attr_bInterfaceProtocol.attr,
 886         &dev_attr_modalias.attr,
 887         &dev_attr_supports_autosuspend.attr,
 888         NULL,
 889 };
 890 static struct attribute_group intf_attr_grp = {
 891         .attrs = intf_attrs,
 892 };
 893
 894 static struct attribute *intf_assoc_attrs[] = {
 895         &dev_attr_iad_bFirstInterface.attr,
 896         &dev_attr_iad_bInterfaceCount.attr,
 897         &dev_attr_iad_bFunctionClass.attr,
 898         &dev_attr_iad_bFunctionSubClass.attr,
 899         &dev_attr_iad_bFunctionProtocol.attr,
 900         NULL,
 901 };
 902
 903 static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
 904                 struct attribute *a, int n)
 905 {
 906         struct device *dev = container_of(kobj, struct device, kobj);
 907         struct usb_interface *intf = to_usb_interface(dev);
 908
 909         if (intf->intf_assoc == NULL)
 910                 return 0;
 911         return a->mode;
 912 }
 913
 914 static struct attribute_group intf_assoc_attr_grp = {
 915         .attrs =        intf_assoc_attrs,
 916         .is_visible =   intf_assoc_attrs_are_visible,
 917 };
 918
 919 const struct attribute_group *usb_interface_groups[] = {
 920         &intf_attr_grp,
 921         &intf_assoc_attr_grp,
 922         NULL
 923 };
 924
 925 void usb_create_sysfs_intf_files(struct usb_interface *intf)
 926 {
 927         struct usb_device *udev = interface_to_usbdev(intf);
 928         struct usb_host_interface *alt = intf->cur_altsetting;
 929
 930         if (intf->sysfs_files_created || intf->unregistering)
 931                 return;
 932
 933         if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
 934                 alt->string = usb_cache_string(udev, alt->desc.iInterface);
 935         if (alt->string && device_create_file(&intf->dev, &dev_attr_interface))
 936                 ;       /* We don't actually care if the function fails. */
 937         intf->sysfs_files_created = 1;
 938 }
 939
 940 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
 941 {
 942         if (!intf->sysfs_files_created)
 943                 return;
 944
 945         device_remove_file(&intf->dev, &dev_attr_interface);
 946         intf->sysfs_files_created = 0;
 947 }