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, 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);                 \
  32         else                                                            \
  33                 return 0;                                               \
  34 }                                                                       \
  35
  36 #define usb_actconfig_attr(field, format_string)                \
  37         usb_actconfig_show(field, format_string)                \
  38         static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
  39
  40 usb_actconfig_attr(bNumInterfaces, "%2d\n")
  41 usb_actconfig_attr(bmAttributes, "%2x\n")
  42
  43 static ssize_t show_bMaxPower(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)
  52                 return 0;
  53         return sprintf(buf, "%dmA\n", usb_get_max_power(udev, actconfig));
  54 }
  55 static DEVICE_ATTR(bMaxPower, S_IRUGO, show_bMaxPower, NULL);
  56
  57 static ssize_t show_configuration_string(struct device *dev,
  58                 struct device_attribute *attr, char *buf)
  59 {
  60         struct usb_device *udev;
  61         struct usb_host_config *actconfig;
  62
  63         udev = to_usb_device(dev);
  64         actconfig = udev->actconfig;
  65         if ((!actconfig) || (!actconfig->string))
  66                 return 0;
  67         return sprintf(buf, "%s\n", actconfig->string);
  68 }
  69 static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL);
  70
  71 /* configuration value is always present, and r/w */
  72 usb_actconfig_show(bConfigurationValue, "%u\n");
  73
  74 static ssize_t
  75 set_bConfigurationValue(struct device *dev, struct device_attribute *attr,
  76                 const char *buf, size_t count)
  77 {
  78         struct usb_device       *udev = to_usb_device(dev);
  79         int                     config, value;
  80
  81         if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
  82                 return -EINVAL;
  83         usb_lock_device(udev);
  84         value = usb_set_configuration(udev, config);
  85         usb_unlock_device(udev);
  86         return (value < 0) ? value : count;
  87 }
  88
  89 static DEVICE_ATTR_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,
  90                 show_bConfigurationValue, set_bConfigurationValue);
  91
  92 /* String fields */
  93 #define usb_string_attr(name)                                           \
  94 static ssize_t  show_##name(struct device *dev,                         \
  95                 struct device_attribute *attr, char *buf)               \
  96 {                                                                       \
  97         struct usb_device *udev;                                        \
  98         int retval;                                                     \
  99                                                                         \
 100         udev = to_usb_device(dev);                                      \
 101         usb_lock_device(udev);                                          \
 102         retval = sprintf(buf, "%s\n", udev->name);                      \
 103         usb_unlock_device(udev);                                        \
 104         return retval;                                                  \
 105 }                                                                       \
 106 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 107
 108 usb_string_attr(product);
 109 usb_string_attr(manufacturer);
 110 usb_string_attr(serial);
 111
 112 static ssize_t
 113 show_speed(struct device *dev, struct device_attribute *attr, char *buf)
 114 {
 115         struct usb_device *udev;
 116         char *speed;
 117
 118         udev = to_usb_device(dev);
 119
 120         switch (udev->speed) {
 121         case USB_SPEED_LOW:
 122                 speed = "1.5";
 123                 break;
 124         case USB_SPEED_UNKNOWN:
 125         case USB_SPEED_FULL:
 126                 speed = "12";
 127                 break;
 128         case USB_SPEED_HIGH:
 129                 speed = "480";
 130                 break;
 131         case USB_SPEED_WIRELESS:
 132                 speed = "480";
 133                 break;
 134         case USB_SPEED_SUPER:
 135                 speed = "5000";
 136                 break;
 137         default:
 138                 speed = "unknown";
 139         }
 140         return sprintf(buf, "%s\n", speed);
 141 }
 142 static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL);
 143
 144 static ssize_t
 145 show_busnum(struct device *dev, struct device_attribute *attr, char *buf)
 146 {
 147         struct usb_device *udev;
 148
 149         udev = to_usb_device(dev);
 150         return sprintf(buf, "%d\n", udev->bus->busnum);
 151 }
 152 static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL);
 153
 154 static ssize_t
 155 show_devnum(struct device *dev, struct device_attribute *attr, char *buf)
 156 {
 157         struct usb_device *udev;
 158
 159         udev = to_usb_device(dev);
 160         return sprintf(buf, "%d\n", udev->devnum);
 161 }
 162 static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL);
 163
 164 static ssize_t
 165 show_devpath(struct device *dev, struct device_attribute *attr, char *buf)
 166 {
 167         struct usb_device *udev;
 168
 169         udev = to_usb_device(dev);
 170         return sprintf(buf, "%s\n", udev->devpath);
 171 }
 172 static DEVICE_ATTR(devpath, S_IRUGO, show_devpath, NULL);
 173
 174 static ssize_t
 175 show_version(struct device *dev, struct device_attribute *attr, char *buf)
 176 {
 177         struct usb_device *udev;
 178         u16 bcdUSB;
 179
 180         udev = to_usb_device(dev);
 181         bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
 182         return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
 183 }
 184 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
 185
 186 static ssize_t
 187 show_maxchild(struct device *dev, struct device_attribute *attr, char *buf)
 188 {
 189         struct usb_device *udev;
 190
 191         udev = to_usb_device(dev);
 192         return sprintf(buf, "%d\n", udev->maxchild);
 193 }
 194 static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL);
 195
 196 static ssize_t
 197 show_quirks(struct device *dev, struct device_attribute *attr, char *buf)
 198 {
 199         struct usb_device *udev;
 200
 201         udev = to_usb_device(dev);
 202         return sprintf(buf, "0x%x\n", udev->quirks);
 203 }
 204 static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);
 205
 206 static ssize_t
 207 show_avoid_reset_quirk(struct device *dev, struct device_attribute *attr, char *buf)
 208 {
 209         struct usb_device *udev;
 210
 211         udev = to_usb_device(dev);
 212         return sprintf(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET));
 213 }
 214
 215 static ssize_t
 216 set_avoid_reset_quirk(struct device *dev, struct device_attribute *attr,
 217                 const char *buf, size_t count)
 218 {
 219         struct usb_device       *udev = to_usb_device(dev);
 220         int                     val;
 221
 222         if (sscanf(buf, "%d", &val) != 1 || val < 0 || val > 1)
 223                 return -EINVAL;
 224         usb_lock_device(udev);
 225         if (val)
 226                 udev->quirks |= USB_QUIRK_RESET;
 227         else
 228                 udev->quirks &= ~USB_QUIRK_RESET;
 229         usb_unlock_device(udev);
 230         return count;
 231 }
 232
 233 static DEVICE_ATTR(avoid_reset_quirk, S_IRUGO | S_IWUSR,
 234                 show_avoid_reset_quirk, set_avoid_reset_quirk);
 235
 236 static ssize_t
 237 show_urbnum(struct device *dev, struct device_attribute *attr, char *buf)
 238 {
 239         struct usb_device *udev;
 240
 241         udev = to_usb_device(dev);
 242         return sprintf(buf, "%d\n", atomic_read(&udev->urbnum));
 243 }
 244 static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL);
 245
 246 static ssize_t
 247 show_removable(struct device *dev, struct device_attribute *attr, char *buf)
 248 {
 249         struct usb_device *udev;
 250         char *state;
 251
 252         udev = to_usb_device(dev);
 253
 254         switch (udev->removable) {
 255         case USB_DEVICE_REMOVABLE:
 256                 state = "removable";
 257                 break;
 258         case USB_DEVICE_FIXED:
 259                 state = "fixed";
 260                 break;
 261         default:
 262                 state = "unknown";
 263         }
 264
 265         return sprintf(buf, "%s\n", state);
 266 }
 267 static DEVICE_ATTR(removable, S_IRUGO, show_removable, NULL);
 268
 269 static ssize_t
 270 show_ltm_capable(struct device *dev, struct device_attribute *attr, char *buf)
 271 {
 272         if (usb_device_supports_ltm(to_usb_device(dev)))
 273                 return sprintf(buf, "%s\n", "yes");
 274         return sprintf(buf, "%s\n", "no");
 275 }
 276 static DEVICE_ATTR(ltm_capable, S_IRUGO, show_ltm_capable, NULL);
 277
 278 #ifdef  CONFIG_PM
 279
 280 static ssize_t
 281 show_persist(struct device *dev, struct device_attribute *attr, char *buf)
 282 {
 283         struct usb_device *udev = to_usb_device(dev);
 284
 285         return sprintf(buf, "%d\n", udev->persist_enabled);
 286 }
 287
 288 static ssize_t
 289 set_persist(struct device *dev, struct device_attribute *attr,
 290                 const char *buf, size_t count)
 291 {
 292         struct usb_device *udev = to_usb_device(dev);
 293         int value;
 294
 295         /* Hubs are always enabled for USB_PERSIST */
 296         if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
 297                 return -EPERM;
 298
 299         if (sscanf(buf, "%d", &value) != 1)
 300                 return -EINVAL;
 301
 302         usb_lock_device(udev);
 303         udev->persist_enabled = !!value;
 304         usb_unlock_device(udev);
 305         return count;
 306 }
 307
 308 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
 309
 310 static int add_persist_attributes(struct device *dev)
 311 {
 312         int rc = 0;
 313
 314         if (is_usb_device(dev)) {
 315                 struct usb_device *udev = to_usb_device(dev);
 316
 317                 /* Hubs are automatically enabled for USB_PERSIST,
 318                  * no point in creating the attribute file.
 319                  */
 320                 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
 321                         rc = sysfs_add_file_to_group(&dev->kobj,
 322                                         &dev_attr_persist.attr,
 323                                         power_group_name);
 324         }
 325         return rc;
 326 }
 327
 328 static void remove_persist_attributes(struct device *dev)
 329 {
 330         sysfs_remove_file_from_group(&dev->kobj,
 331                         &dev_attr_persist.attr,
 332                         power_group_name);
 333 }
 334 #else
 335
 336 #define add_persist_attributes(dev)     0
 337 #define remove_persist_attributes(dev)  do {} while (0)
 338
 339 #endif  /* CONFIG_PM */
 340
 341 #ifdef  CONFIG_PM_RUNTIME
 342
 343 static ssize_t
 344 show_connected_duration(struct device *dev, struct device_attribute *attr,
 345                 char *buf)
 346 {
 347         struct usb_device *udev = to_usb_device(dev);
 348
 349         return sprintf(buf, "%u\n",
 350                         jiffies_to_msecs(jiffies - udev->connect_time));
 351 }
 352
 353 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
 354
 355 /*
 356  * If the device is resumed, the last time the device was suspended has
 357  * been pre-subtracted from active_duration.  We add the current time to
 358  * get the duration that the device was actually active.
 359  *
 360  * If the device is suspended, the active_duration is up-to-date.
 361  */
 362 static ssize_t
 363 show_active_duration(struct device *dev, struct device_attribute *attr,
 364                 char *buf)
 365 {
 366         struct usb_device *udev = to_usb_device(dev);
 367         int duration;
 368
 369         if (udev->state != USB_STATE_SUSPENDED)
 370                 duration = jiffies_to_msecs(jiffies + udev->active_duration);
 371         else
 372                 duration = jiffies_to_msecs(udev->active_duration);
 373         return sprintf(buf, "%u\n", duration);
 374 }
 375
 376 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
 377
 378 static ssize_t
 379 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
 380 {
 381         return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000);
 382 }
 383
 384 static ssize_t
 385 set_autosuspend(struct device *dev, struct device_attribute *attr,
 386                 const char *buf, size_t count)
 387 {
 388         int value;
 389
 390         if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
 391                         value <= -INT_MAX/1000)
 392                 return -EINVAL;
 393
 394         pm_runtime_set_autosuspend_delay(dev, value * 1000);
 395         return count;
 396 }
 397
 398 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
 399                 show_autosuspend, set_autosuspend);
 400
 401 static const char on_string[] = "on";
 402 static const char auto_string[] = "auto";
 403
 404 static void warn_level(void) {
 405         static int level_warned;
 406
 407         if (!level_warned) {
 408                 level_warned = 1;
 409                 printk(KERN_WARNING "WARNING! power/level is deprecated; "
 410                                 "use power/control instead\n");
 411         }
 412 }
 413
 414 static ssize_t
 415 show_level(struct device *dev, struct device_attribute *attr, char *buf)
 416 {
 417         struct usb_device *udev = to_usb_device(dev);
 418         const char *p = auto_string;
 419
 420         warn_level();
 421         if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
 422                 p = on_string;
 423         return sprintf(buf, "%s\n", p);
 424 }
 425
 426 static ssize_t
 427 set_level(struct device *dev, struct device_attribute *attr,
 428                 const char *buf, size_t count)
 429 {
 430         struct usb_device *udev = to_usb_device(dev);
 431         int len = count;
 432         char *cp;
 433         int rc = count;
 434
 435         warn_level();
 436         cp = memchr(buf, '\n', count);
 437         if (cp)
 438                 len = cp - buf;
 439
 440         usb_lock_device(udev);
 441
 442         if (len == sizeof on_string - 1 &&
 443                         strncmp(buf, on_string, len) == 0)
 444                 usb_disable_autosuspend(udev);
 445
 446         else if (len == sizeof auto_string - 1 &&
 447                         strncmp(buf, auto_string, len) == 0)
 448                 usb_enable_autosuspend(udev);
 449
 450         else
 451                 rc = -EINVAL;
 452
 453         usb_unlock_device(udev);
 454         return rc;
 455 }
 456
 457 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
 458
 459 static ssize_t
 460 show_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr,
 461                                 char *buf)
 462 {
 463         struct usb_device *udev = to_usb_device(dev);
 464         const char *p;
 465
 466         if (udev->usb2_hw_lpm_enabled == 1)
 467                 p = "enabled";
 468         else
 469                 p = "disabled";
 470
 471         return sprintf(buf, "%s\n", p);
 472 }
 473
 474 static ssize_t
 475 set_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr,
 476                 const char *buf, size_t count)
 477 {
 478         struct usb_device *udev = to_usb_device(dev);
 479         bool value;
 480         int ret;
 481
 482         usb_lock_device(udev);
 483
 484         ret = strtobool(buf, &value);
 485
 486         if (!ret)
 487                 ret = usb_set_usb2_hardware_lpm(udev, value);
 488
 489         usb_unlock_device(udev);
 490
 491         if (!ret)
 492                 return count;
 493
 494         return ret;
 495 }
 496
 497 static DEVICE_ATTR(usb2_hardware_lpm, S_IRUGO | S_IWUSR, show_usb2_hardware_lpm,
 498                         set_usb2_hardware_lpm);
 499
 500 static struct attribute *usb2_hardware_lpm_attr[] = {
 501         &dev_attr_usb2_hardware_lpm.attr,
 502         NULL,
 503 };
 504 static struct attribute_group usb2_hardware_lpm_attr_group = {
 505         .name   = power_group_name,
 506         .attrs  = usb2_hardware_lpm_attr,
 507 };
 508
 509 static struct attribute *power_attrs[] = {
 510         &dev_attr_autosuspend.attr,
 511         &dev_attr_level.attr,
 512         &dev_attr_connected_duration.attr,
 513         &dev_attr_active_duration.attr,
 514         NULL,
 515 };
 516 static struct attribute_group power_attr_group = {
 517         .name   = power_group_name,
 518         .attrs  = power_attrs,
 519 };
 520
 521 static int add_power_attributes(struct device *dev)
 522 {
 523         int rc = 0;
 524
 525         if (is_usb_device(dev)) {
 526                 struct usb_device *udev = to_usb_device(dev);
 527                 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
 528                 if (udev->usb2_hw_lpm_capable == 1)
 529                         rc = sysfs_merge_group(&dev->kobj,
 530                                         &usb2_hardware_lpm_attr_group);
 531         }
 532
 533         return rc;
 534 }
 535
 536 static void remove_power_attributes(struct device *dev)
 537 {
 538         sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
 539         sysfs_unmerge_group(&dev->kobj, &power_attr_group);
 540 }
 541
 542 #else
 543
 544 #define add_power_attributes(dev)       0
 545 #define remove_power_attributes(dev)    do {} while (0)
 546
 547 #endif  /* CONFIG_PM_RUNTIME */
 548
 549
 550 /* Descriptor fields */
 551 #define usb_descriptor_attr_le16(field, format_string)                  \
 552 static ssize_t                                                          \
 553 show_##field(struct device *dev, struct device_attribute *attr, \
 554                 char *buf)                                              \
 555 {                                                                       \
 556         struct usb_device *udev;                                        \
 557                                                                         \
 558         udev = to_usb_device(dev);                                      \
 559         return sprintf(buf, format_string,                              \
 560                         le16_to_cpu(udev->descriptor.field));           \
 561 }                                                                       \
 562 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 563
 564 usb_descriptor_attr_le16(idVendor, "%04x\n")
 565 usb_descriptor_attr_le16(idProduct, "%04x\n")
 566 usb_descriptor_attr_le16(bcdDevice, "%04x\n")
 567
 568 #define usb_descriptor_attr(field, format_string)                       \
 569 static ssize_t                                                          \
 570 show_##field(struct device *dev, struct device_attribute *attr, \
 571                 char *buf)                                              \
 572 {                                                                       \
 573         struct usb_device *udev;                                        \
 574                                                                         \
 575         udev = to_usb_device(dev);                                      \
 576         return sprintf(buf, format_string, udev->descriptor.field);     \
 577 }                                                                       \
 578 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 579
 580 usb_descriptor_attr(bDeviceClass, "%02x\n")
 581 usb_descriptor_attr(bDeviceSubClass, "%02x\n")
 582 usb_descriptor_attr(bDeviceProtocol, "%02x\n")
 583 usb_descriptor_attr(bNumConfigurations, "%d\n")
 584 usb_descriptor_attr(bMaxPacketSize0, "%d\n")
 585
 586
 587
 588 /* show if the device is authorized (1) or not (0) */
 589 static ssize_t usb_dev_authorized_show(struct device *dev,
 590                                        struct device_attribute *attr,
 591                                        char *buf)
 592 {
 593         struct usb_device *usb_dev = to_usb_device(dev);
 594         return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
 595 }
 596
 597
 598 /*
 599  * Authorize a device to be used in the system
 600  *
 601  * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
 602  */
 603 static ssize_t usb_dev_authorized_store(struct device *dev,
 604                                         struct device_attribute *attr,
 605                                         const char *buf, size_t size)
 606 {
 607         ssize_t result;
 608         struct usb_device *usb_dev = to_usb_device(dev);
 609         unsigned val;
 610         result = sscanf(buf, "%u\n", &val);
 611         if (result != 1)
 612                 result = -EINVAL;
 613         else if (val == 0)
 614                 result = usb_deauthorize_device(usb_dev);
 615         else
 616                 result = usb_authorize_device(usb_dev);
 617         return result < 0? result : size;
 618 }
 619
 620 static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, 0644,
 621             usb_dev_authorized_show, usb_dev_authorized_store);
 622
 623 /* "Safely remove a device" */
 624 static ssize_t usb_remove_store(struct device *dev,
 625                 struct device_attribute *attr,
 626                 const char *buf, size_t count)
 627 {
 628         struct usb_device *udev = to_usb_device(dev);
 629         int rc = 0;
 630
 631         usb_lock_device(udev);
 632         if (udev->state != USB_STATE_NOTATTACHED) {
 633
 634                 /* To avoid races, first unconfigure and then remove */
 635                 usb_set_configuration(udev, -1);
 636                 rc = usb_remove_device(udev);
 637         }
 638         if (rc == 0)
 639                 rc = count;
 640         usb_unlock_device(udev);
 641         return rc;
 642 }
 643 static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0200, NULL, usb_remove_store);
 644
 645
 646 static struct attribute *dev_attrs[] = {
 647         /* current configuration's attributes */
 648         &dev_attr_configuration.attr,
 649         &dev_attr_bNumInterfaces.attr,
 650         &dev_attr_bConfigurationValue.attr,
 651         &dev_attr_bmAttributes.attr,
 652         &dev_attr_bMaxPower.attr,
 653         /* device attributes */
 654         &dev_attr_urbnum.attr,
 655         &dev_attr_idVendor.attr,
 656         &dev_attr_idProduct.attr,
 657         &dev_attr_bcdDevice.attr,
 658         &dev_attr_bDeviceClass.attr,
 659         &dev_attr_bDeviceSubClass.attr,
 660         &dev_attr_bDeviceProtocol.attr,
 661         &dev_attr_bNumConfigurations.attr,
 662         &dev_attr_bMaxPacketSize0.attr,
 663         &dev_attr_speed.attr,
 664         &dev_attr_busnum.attr,
 665         &dev_attr_devnum.attr,
 666         &dev_attr_devpath.attr,
 667         &dev_attr_version.attr,
 668         &dev_attr_maxchild.attr,
 669         &dev_attr_quirks.attr,
 670         &dev_attr_avoid_reset_quirk.attr,
 671         &dev_attr_authorized.attr,
 672         &dev_attr_remove.attr,
 673         &dev_attr_removable.attr,
 674         &dev_attr_ltm_capable.attr,
 675         NULL,
 676 };
 677 static struct attribute_group dev_attr_grp = {
 678         .attrs = dev_attrs,
 679 };
 680
 681 /* When modifying this list, be sure to modify dev_string_attrs_are_visible()
 682  * accordingly.
 683  */
 684 static struct attribute *dev_string_attrs[] = {
 685         &dev_attr_manufacturer.attr,
 686         &dev_attr_product.attr,
 687         &dev_attr_serial.attr,
 688         NULL
 689 };
 690
 691 static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
 692                 struct attribute *a, int n)
 693 {
 694         struct device *dev = container_of(kobj, struct device, kobj);
 695         struct usb_device *udev = to_usb_device(dev);
 696
 697         if (a == &dev_attr_manufacturer.attr) {
 698                 if (udev->manufacturer == NULL)
 699                         return 0;
 700         } else if (a == &dev_attr_product.attr) {
 701                 if (udev->product == NULL)
 702                         return 0;
 703         } else if (a == &dev_attr_serial.attr) {
 704                 if (udev->serial == NULL)
 705                         return 0;
 706         }
 707         return a->mode;
 708 }
 709
 710 static struct attribute_group dev_string_attr_grp = {
 711         .attrs =        dev_string_attrs,
 712         .is_visible =   dev_string_attrs_are_visible,
 713 };
 714
 715 const struct attribute_group *usb_device_groups[] = {
 716         &dev_attr_grp,
 717         &dev_string_attr_grp,
 718         NULL
 719 };
 720
 721 /* Binary descriptors */
 722
 723 static ssize_t
 724 read_descriptors(struct file *filp, struct kobject *kobj,
 725                 struct bin_attribute *attr,
 726                 char *buf, loff_t off, size_t count)
 727 {
 728         struct device *dev = container_of(kobj, struct device, kobj);
 729         struct usb_device *udev = to_usb_device(dev);
 730         size_t nleft = count;
 731         size_t srclen, n;
 732         int cfgno;
 733         void *src;
 734
 735         /* The binary attribute begins with the device descriptor.
 736          * Following that are the raw descriptor entries for all the
 737          * configurations (config plus subsidiary descriptors).
 738          */
 739         for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
 740                         nleft > 0; ++cfgno) {
 741                 if (cfgno < 0) {
 742                         src = &udev->descriptor;
 743                         srclen = sizeof(struct usb_device_descriptor);
 744                 } else {
 745                         src = udev->rawdescriptors[cfgno];
 746                         srclen = __le16_to_cpu(udev->config[cfgno].desc.
 747                                         wTotalLength);
 748                 }
 749                 if (off < srclen) {
 750                         n = min(nleft, srclen - (size_t) off);
 751                         memcpy(buf, src + off, n);
 752                         nleft -= n;
 753                         buf += n;
 754                         off = 0;
 755                 } else {
 756                         off -= srclen;
 757                 }
 758         }
 759         return count - nleft;
 760 }
 761
 762 static struct bin_attribute dev_bin_attr_descriptors = {
 763         .attr = {.name = "descriptors", .mode = 0444},
 764         .read = read_descriptors,
 765         .size = 18 + 65535,     /* dev descr + max-size raw descriptor */
 766 };
 767
 768 int usb_create_sysfs_dev_files(struct usb_device *udev)
 769 {
 770         struct device *dev = &udev->dev;
 771         int retval;
 772
 773         retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
 774         if (retval)
 775                 goto error;
 776
 777         retval = add_persist_attributes(dev);
 778         if (retval)
 779                 goto error;
 780
 781         retval = add_power_attributes(dev);
 782         if (retval)
 783                 goto error;
 784         return retval;
 785 error:
 786         usb_remove_sysfs_dev_files(udev);
 787         return retval;
 788 }
 789
 790 void usb_remove_sysfs_dev_files(struct usb_device *udev)
 791 {
 792         struct device *dev = &udev->dev;
 793
 794         remove_power_attributes(dev);
 795         remove_persist_attributes(dev);
 796         device_remove_bin_file(dev, &dev_bin_attr_descriptors);
 797 }
 798
 799 /* Interface Accociation Descriptor fields */
 800 #define usb_intf_assoc_attr(field, format_string)                       \
 801 static ssize_t                                                          \
 802 show_iad_##field(struct device *dev, struct device_attribute *attr,     \
 803                 char *buf)                                              \
 804 {                                                                       \
 805         struct usb_interface *intf = to_usb_interface(dev);             \
 806                                                                         \
 807         return sprintf(buf, format_string,                              \
 808                         intf->intf_assoc->field);                       \
 809 }                                                                       \
 810 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
 811
 812 usb_intf_assoc_attr(bFirstInterface, "%02x\n")
 813 usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
 814 usb_intf_assoc_attr(bFunctionClass, "%02x\n")
 815 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
 816 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
 817
 818 /* Interface fields */
 819 #define usb_intf_attr(field, format_string)                             \
 820 static ssize_t                                                          \
 821 show_##field(struct device *dev, struct device_attribute *attr, \
 822                 char *buf)                                              \
 823 {                                                                       \
 824         struct usb_interface *intf = to_usb_interface(dev);             \
 825                                                                         \
 826         return sprintf(buf, format_string,                              \
 827                         intf->cur_altsetting->desc.field);              \
 828 }                                                                       \
 829 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 830
 831 usb_intf_attr(bInterfaceNumber, "%02x\n")
 832 usb_intf_attr(bAlternateSetting, "%2d\n")
 833 usb_intf_attr(bNumEndpoints, "%02x\n")
 834 usb_intf_attr(bInterfaceClass, "%02x\n")
 835 usb_intf_attr(bInterfaceSubClass, "%02x\n")
 836 usb_intf_attr(bInterfaceProtocol, "%02x\n")
 837
 838 static ssize_t show_interface_string(struct device *dev,
 839                 struct device_attribute *attr, char *buf)
 840 {
 841         struct usb_interface *intf;
 842         char *string;
 843
 844         intf = to_usb_interface(dev);
 845         string = intf->cur_altsetting->string;
 846         barrier();              /* The altsetting might change! */
 847
 848         if (!string)
 849                 return 0;
 850         return sprintf(buf, "%s\n", string);
 851 }
 852 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
 853
 854 static ssize_t show_modalias(struct device *dev,
 855                 struct device_attribute *attr, char *buf)
 856 {
 857         struct usb_interface *intf;
 858         struct usb_device *udev;
 859         struct usb_host_interface *alt;
 860
 861         intf = to_usb_interface(dev);
 862         udev = interface_to_usbdev(intf);
 863         alt = intf->cur_altsetting;
 864
 865         return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
 866                         "ic%02Xisc%02Xip%02Xin%02X\n",
 867                         le16_to_cpu(udev->descriptor.idVendor),
 868                         le16_to_cpu(udev->descriptor.idProduct),
 869                         le16_to_cpu(udev->descriptor.bcdDevice),
 870                         udev->descriptor.bDeviceClass,
 871                         udev->descriptor.bDeviceSubClass,
 872                         udev->descriptor.bDeviceProtocol,
 873                         alt->desc.bInterfaceClass,
 874                         alt->desc.bInterfaceSubClass,
 875                         alt->desc.bInterfaceProtocol,
 876                         alt->desc.bInterfaceNumber);
 877 }
 878 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
 879
 880 static ssize_t show_supports_autosuspend(struct device *dev,
 881                 struct device_attribute *attr, char *buf)
 882 {
 883         struct usb_interface *intf;
 884         struct usb_device *udev;
 885         int ret;
 886
 887         intf = to_usb_interface(dev);
 888         udev = interface_to_usbdev(intf);
 889
 890         usb_lock_device(udev);
 891         /* Devices will be autosuspended even when an interface isn't claimed */
 892         if (!intf->dev.driver ||
 893                         to_usb_driver(intf->dev.driver)->supports_autosuspend)
 894                 ret = sprintf(buf, "%u\n", 1);
 895         else
 896                 ret = sprintf(buf, "%u\n", 0);
 897         usb_unlock_device(udev);
 898
 899         return ret;
 900 }
 901 static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
 902
 903 static struct attribute *intf_attrs[] = {
 904         &dev_attr_bInterfaceNumber.attr,
 905         &dev_attr_bAlternateSetting.attr,
 906         &dev_attr_bNumEndpoints.attr,
 907         &dev_attr_bInterfaceClass.attr,
 908         &dev_attr_bInterfaceSubClass.attr,
 909         &dev_attr_bInterfaceProtocol.attr,
 910         &dev_attr_modalias.attr,
 911         &dev_attr_supports_autosuspend.attr,
 912         NULL,
 913 };
 914 static struct attribute_group intf_attr_grp = {
 915         .attrs = intf_attrs,
 916 };
 917
 918 static struct attribute *intf_assoc_attrs[] = {
 919         &dev_attr_iad_bFirstInterface.attr,
 920         &dev_attr_iad_bInterfaceCount.attr,
 921         &dev_attr_iad_bFunctionClass.attr,
 922         &dev_attr_iad_bFunctionSubClass.attr,
 923         &dev_attr_iad_bFunctionProtocol.attr,
 924         NULL,
 925 };
 926
 927 static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
 928                 struct attribute *a, int n)
 929 {
 930         struct device *dev = container_of(kobj, struct device, kobj);
 931         struct usb_interface *intf = to_usb_interface(dev);
 932
 933         if (intf->intf_assoc == NULL)
 934                 return 0;
 935         return a->mode;
 936 }
 937
 938 static struct attribute_group intf_assoc_attr_grp = {
 939         .attrs =        intf_assoc_attrs,
 940         .is_visible =   intf_assoc_attrs_are_visible,
 941 };
 942
 943 const struct attribute_group *usb_interface_groups[] = {
 944         &intf_attr_grp,
 945         &intf_assoc_attr_grp,
 946         NULL
 947 };
 948
 949 void usb_create_sysfs_intf_files(struct usb_interface *intf)
 950 {
 951         struct usb_device *udev = interface_to_usbdev(intf);
 952         struct usb_host_interface *alt = intf->cur_altsetting;
 953
 954         if (intf->sysfs_files_created || intf->unregistering)
 955                 return;
 956
 957         if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
 958                 alt->string = usb_cache_string(udev, alt->desc.iInterface);
 959         if (alt->string && device_create_file(&intf->dev, &dev_attr_interface))
 960                 ;       /* We don't actually care if the function fails. */
 961         intf->sysfs_files_created = 1;
 962 }
 963
 964 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
 965 {
 966         if (!intf->sysfs_files_created)
 967                 return;
 968
 969         device_remove_file(&intf->dev, &dev_attr_interface);
 970         intf->sysfs_files_created = 0;
 971 }