drivers/usb/core/sysfs.c

   1 /*
   2  * drivers/usb/core/sysfs.c
   3  *
   4  * (C) Copyright 2002 David Brownell
   5  * (C) Copyright 2002,2004 Greg Kroah-Hartman
   6  * (C) Copyright 2002,2004 IBM Corp.
   7  *
   8  * All of the sysfs file attributes for usb devices and interfaces.
   9  *
  10  */
  11
  12
  13 #include <linux/kernel.h>
  14 #include <linux/string.h>
  15 #include <linux/usb.h>
  16 #include <linux/usb/quirks.h>
  17 #include "usb.h"
  18
  19 /* Active configuration fields */
  20 #define usb_actconfig_show(field, multiplier, format_string)            \
  21 static ssize_t  show_##field(struct device *dev,                        \
  22                 struct device_attribute *attr, char *buf)               \
  23 {                                                                       \
  24         struct usb_device *udev;                                        \
  25         struct usb_host_config *actconfig;                              \
  26                                                                         \
  27         udev = to_usb_device(dev);                                      \
  28         actconfig = udev->actconfig;                                    \
  29         if (actconfig)                                                  \
  30                 return sprintf(buf, format_string,                      \
  31                                 actconfig->desc.field * multiplier);    \
  32         else                                                            \
  33                 return 0;                                               \
  34 }                                                                       \
  35
  36 #define usb_actconfig_attr(field, multiplier, format_string)            \
  37 usb_actconfig_show(field, multiplier, format_string)                    \
  38 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
  39
  40 usb_actconfig_attr(bNumInterfaces, 1, "%2d\n")
  41 usb_actconfig_attr(bmAttributes, 1, "%2x\n")
  42 usb_actconfig_attr(bMaxPower, 2, "%3dmA\n")
  43
  44 static ssize_t show_configuration_string(struct device *dev,
  45                 struct device_attribute *attr, char *buf)
  46 {
  47         struct usb_device *udev;
  48         struct usb_host_config *actconfig;
  49
  50         udev = to_usb_device(dev);
  51         actconfig = udev->actconfig;
  52         if ((!actconfig) || (!actconfig->string))
  53                 return 0;
  54         return sprintf(buf, "%s\n", actconfig->string);
  55 }
  56 static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL);
  57
  58 /* configuration value is always present, and r/w */
  59 usb_actconfig_show(bConfigurationValue, 1, "%u\n");
  60
  61 static ssize_t
  62 set_bConfigurationValue(struct device *dev, struct device_attribute *attr,
  63                 const char *buf, size_t count)
  64 {
  65         struct usb_device       *udev = to_usb_device(dev);
  66         int                     config, value;
  67
  68         if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
  69                 return -EINVAL;
  70         usb_lock_device(udev);
  71         value = usb_set_configuration(udev, config);
  72         usb_unlock_device(udev);
  73         return (value < 0) ? value : count;
  74 }
  75
  76 static DEVICE_ATTR(bConfigurationValue, S_IRUGO | S_IWUSR,
  77                 show_bConfigurationValue, set_bConfigurationValue);
  78
  79 /* String fields */
  80 #define usb_string_attr(name)                                           \
  81 static ssize_t  show_##name(struct device *dev,                         \
  82                 struct device_attribute *attr, char *buf)               \
  83 {                                                                       \
  84         struct usb_device *udev;                                        \
  85         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
 234 #ifdef  CONFIG_PM
 235
 236 static ssize_t
 237 show_persist(struct device *dev, struct device_attribute *attr, char *buf)
 238 {
 239         struct usb_device *udev = to_usb_device(dev);
 240
 241         return sprintf(buf, "%d\n", udev->persist_enabled);
 242 }
 243
 244 static ssize_t
 245 set_persist(struct device *dev, struct device_attribute *attr,
 246                 const char *buf, size_t count)
 247 {
 248         struct usb_device *udev = to_usb_device(dev);
 249         int value;
 250
 251         /* Hubs are always enabled for USB_PERSIST */
 252         if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
 253                 return -EPERM;
 254
 255         if (sscanf(buf, "%d", &value) != 1)
 256                 return -EINVAL;
 257
 258         usb_lock_device(udev);
 259         udev->persist_enabled = !!value;
 260         usb_unlock_device(udev);
 261         return count;
 262 }
 263
 264 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
 265
 266 static int add_persist_attributes(struct device *dev)
 267 {
 268         int rc = 0;
 269
 270         if (is_usb_device(dev)) {
 271                 struct usb_device *udev = to_usb_device(dev);
 272
 273                 /* Hubs are automatically enabled for USB_PERSIST,
 274                  * no point in creating the attribute file.
 275                  */
 276                 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
 277                         rc = sysfs_add_file_to_group(&dev->kobj,
 278                                         &dev_attr_persist.attr,
 279                                         power_group_name);
 280         }
 281         return rc;
 282 }
 283
 284 static void remove_persist_attributes(struct device *dev)
 285 {
 286         sysfs_remove_file_from_group(&dev->kobj,
 287                         &dev_attr_persist.attr,
 288                         power_group_name);
 289 }
 290 #else
 291
 292 #define add_persist_attributes(dev)     0
 293 #define remove_persist_attributes(dev)  do {} while (0)
 294
 295 #endif  /* CONFIG_PM */
 296
 297 #ifdef  CONFIG_USB_SUSPEND
 298
 299 static ssize_t
 300 show_connected_duration(struct device *dev, struct device_attribute *attr,
 301                 char *buf)
 302 {
 303         struct usb_device *udev = to_usb_device(dev);
 304
 305         return sprintf(buf, "%u\n",
 306                         jiffies_to_msecs(jiffies - udev->connect_time));
 307 }
 308
 309 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
 310
 311 /*
 312  * If the device is resumed, the last time the device was suspended has
 313  * been pre-subtracted from active_duration.  We add the current time to
 314  * get the duration that the device was actually active.
 315  *
 316  * If the device is suspended, the active_duration is up-to-date.
 317  */
 318 static ssize_t
 319 show_active_duration(struct device *dev, struct device_attribute *attr,
 320                 char *buf)
 321 {
 322         struct usb_device *udev = to_usb_device(dev);
 323         int duration;
 324
 325         if (udev->state != USB_STATE_SUSPENDED)
 326                 duration = jiffies_to_msecs(jiffies + udev->active_duration);
 327         else
 328                 duration = jiffies_to_msecs(udev->active_duration);
 329         return sprintf(buf, "%u\n", duration);
 330 }
 331
 332 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
 333
 334 static ssize_t
 335 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
 336 {
 337         return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000);
 338 }
 339
 340 static ssize_t
 341 set_autosuspend(struct device *dev, struct device_attribute *attr,
 342                 const char *buf, size_t count)
 343 {
 344         int value;
 345
 346         if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
 347                         value <= -INT_MAX/1000)
 348                 return -EINVAL;
 349
 350         pm_runtime_set_autosuspend_delay(dev, value * 1000);
 351         return count;
 352 }
 353
 354 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
 355                 show_autosuspend, set_autosuspend);
 356
 357 static const char on_string[] = "on";
 358 static const char auto_string[] = "auto";
 359
 360 static void warn_level(void) {
 361         static int level_warned;
 362
 363         if (!level_warned) {
 364                 level_warned = 1;
 365                 printk(KERN_WARNING "WARNING! power/level is deprecated; "
 366                                 "use power/control instead\n");
 367         }
 368 }
 369
 370 static ssize_t
 371 show_level(struct device *dev, struct device_attribute *attr, char *buf)
 372 {
 373         struct usb_device *udev = to_usb_device(dev);
 374         const char *p = auto_string;
 375
 376         warn_level();
 377         if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
 378                 p = on_string;
 379         return sprintf(buf, "%s\n", p);
 380 }
 381
 382 static ssize_t
 383 set_level(struct device *dev, struct device_attribute *attr,
 384                 const char *buf, size_t count)
 385 {
 386         struct usb_device *udev = to_usb_device(dev);
 387         int len = count;
 388         char *cp;
 389         int rc = count;
 390
 391         warn_level();
 392         cp = memchr(buf, '\n', count);
 393         if (cp)
 394                 len = cp - buf;
 395
 396         usb_lock_device(udev);
 397
 398         if (len == sizeof on_string - 1 &&
 399                         strncmp(buf, on_string, len) == 0)
 400                 usb_disable_autosuspend(udev);
 401
 402         else if (len == sizeof auto_string - 1 &&
 403                         strncmp(buf, auto_string, len) == 0)
 404                 usb_enable_autosuspend(udev);
 405
 406         else
 407                 rc = -EINVAL;
 408
 409         usb_unlock_device(udev);
 410         return rc;
 411 }
 412
 413 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
 414
 415 static ssize_t
 416 show_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr,
 417                                 char *buf)
 418 {
 419         struct usb_device *udev = to_usb_device(dev);
 420         const char *p;
 421
 422         if (udev->usb2_hw_lpm_enabled == 1)
 423                 p = "enabled";
 424         else
 425                 p = "disabled";
 426
 427         return sprintf(buf, "%s\n", p);
 428 }
 429
 430 static ssize_t
 431 set_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr,
 432                 const char *buf, size_t count)
 433 {
 434         struct usb_device *udev = to_usb_device(dev);
 435         bool value;
 436         int ret;
 437
 438         usb_lock_device(udev);
 439
 440         ret = strtobool(buf, &value);
 441
 442         if (!ret)
 443                 ret = usb_set_usb2_hardware_lpm(udev, value);
 444
 445         usb_unlock_device(udev);
 446
 447         if (!ret)
 448                 return count;
 449
 450         return ret;
 451 }
 452
 453 static DEVICE_ATTR(usb2_hardware_lpm, S_IRUGO | S_IWUSR, show_usb2_hardware_lpm,
 454                         set_usb2_hardware_lpm);
 455
 456 static struct attribute *usb2_hardware_lpm_attr[] = {
 457         &dev_attr_usb2_hardware_lpm.attr,
 458         NULL,
 459 };
 460 static struct attribute_group usb2_hardware_lpm_attr_group = {
 461         .name   = power_group_name,
 462         .attrs  = usb2_hardware_lpm_attr,
 463 };
 464
 465 static struct attribute *power_attrs[] = {
 466         &dev_attr_autosuspend.attr,
 467         &dev_attr_level.attr,
 468         &dev_attr_connected_duration.attr,
 469         &dev_attr_active_duration.attr,
 470         NULL,
 471 };
 472 static struct attribute_group power_attr_group = {
 473         .name   = power_group_name,
 474         .attrs  = power_attrs,
 475 };
 476
 477 static int add_power_attributes(struct device *dev)
 478 {
 479         int rc = 0;
 480
 481         if (is_usb_device(dev)) {
 482                 struct usb_device *udev = to_usb_device(dev);
 483                 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
 484                 if (udev->usb2_hw_lpm_capable == 1)
 485                         rc = sysfs_merge_group(&dev->kobj,
 486                                         &usb2_hardware_lpm_attr_group);
 487         }
 488
 489         return rc;
 490 }
 491
 492 static void remove_power_attributes(struct device *dev)
 493 {
 494         sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
 495         sysfs_unmerge_group(&dev->kobj, &power_attr_group);
 496 }
 497
 498 #else
 499
 500 #define add_power_attributes(dev)       0
 501 #define remove_power_attributes(dev)    do {} while (0)
 502
 503 #endif  /* CONFIG_USB_SUSPEND */
 504
 505
 506 /* Descriptor fields */
 507 #define usb_descriptor_attr_le16(field, format_string)                  \
 508 static ssize_t                                                          \
 509 show_##field(struct device *dev, struct device_attribute *attr, \
 510                 char *buf)                                              \
 511 {                                                                       \
 512         struct usb_device *udev;                                        \
 513                                                                         \
 514         udev = to_usb_device(dev);                                      \
 515         return sprintf(buf, format_string,                              \
 516                         le16_to_cpu(udev->descriptor.field));           \
 517 }                                                                       \
 518 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 519
 520 usb_descriptor_attr_le16(idVendor, "%04x\n")
 521 usb_descriptor_attr_le16(idProduct, "%04x\n")
 522 usb_descriptor_attr_le16(bcdDevice, "%04x\n")
 523
 524 #define usb_descriptor_attr(field, format_string)                       \
 525 static ssize_t                                                          \
 526 show_##field(struct device *dev, struct device_attribute *attr, \
 527                 char *buf)                                              \
 528 {                                                                       \
 529         struct usb_device *udev;                                        \
 530                                                                         \
 531         udev = to_usb_device(dev);                                      \
 532         return sprintf(buf, format_string, udev->descriptor.field);     \
 533 }                                                                       \
 534 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 535
 536 usb_descriptor_attr(bDeviceClass, "%02x\n")
 537 usb_descriptor_attr(bDeviceSubClass, "%02x\n")
 538 usb_descriptor_attr(bDeviceProtocol, "%02x\n")
 539 usb_descriptor_attr(bNumConfigurations, "%d\n")
 540 usb_descriptor_attr(bMaxPacketSize0, "%d\n")
 541
 542
 543
 544 /* show if the device is authorized (1) or not (0) */
 545 static ssize_t usb_dev_authorized_show(struct device *dev,
 546                                        struct device_attribute *attr,
 547                                        char *buf)
 548 {
 549         struct usb_device *usb_dev = to_usb_device(dev);
 550         return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
 551 }
 552
 553
 554 /*
 555  * Authorize a device to be used in the system
 556  *
 557  * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
 558  */
 559 static ssize_t usb_dev_authorized_store(struct device *dev,
 560                                         struct device_attribute *attr,
 561                                         const char *buf, size_t size)
 562 {
 563         ssize_t result;
 564         struct usb_device *usb_dev = to_usb_device(dev);
 565         unsigned val;
 566         result = sscanf(buf, "%u\n", &val);
 567         if (result != 1)
 568                 result = -EINVAL;
 569         else if (val == 0)
 570                 result = usb_deauthorize_device(usb_dev);
 571         else
 572                 result = usb_authorize_device(usb_dev);
 573         return result < 0? result : size;
 574 }
 575
 576 static DEVICE_ATTR(authorized, 0644,
 577             usb_dev_authorized_show, usb_dev_authorized_store);
 578
 579 /* "Safely remove a device" */
 580 static ssize_t usb_remove_store(struct device *dev,
 581                 struct device_attribute *attr,
 582                 const char *buf, size_t count)
 583 {
 584         struct usb_device *udev = to_usb_device(dev);
 585         int rc = 0;
 586
 587         usb_lock_device(udev);
 588         if (udev->state != USB_STATE_NOTATTACHED) {
 589
 590                 /* To avoid races, first unconfigure and then remove */
 591                 usb_set_configuration(udev, -1);
 592                 rc = usb_remove_device(udev);
 593         }
 594         if (rc == 0)
 595                 rc = count;
 596         usb_unlock_device(udev);
 597         return rc;
 598 }
 599 static DEVICE_ATTR(remove, 0200, NULL, usb_remove_store);
 600
 601
 602 static struct attribute *dev_attrs[] = {
 603         /* current configuration's attributes */
 604         &dev_attr_configuration.attr,
 605         &dev_attr_bNumInterfaces.attr,
 606         &dev_attr_bConfigurationValue.attr,
 607         &dev_attr_bmAttributes.attr,
 608         &dev_attr_bMaxPower.attr,
 609         /* device attributes */
 610         &dev_attr_urbnum.attr,
 611         &dev_attr_idVendor.attr,
 612         &dev_attr_idProduct.attr,
 613         &dev_attr_bcdDevice.attr,
 614         &dev_attr_bDeviceClass.attr,
 615         &dev_attr_bDeviceSubClass.attr,
 616         &dev_attr_bDeviceProtocol.attr,
 617         &dev_attr_bNumConfigurations.attr,
 618         &dev_attr_bMaxPacketSize0.attr,
 619         &dev_attr_speed.attr,
 620         &dev_attr_busnum.attr,
 621         &dev_attr_devnum.attr,
 622         &dev_attr_devpath.attr,
 623         &dev_attr_version.attr,
 624         &dev_attr_maxchild.attr,
 625         &dev_attr_quirks.attr,
 626         &dev_attr_avoid_reset_quirk.attr,
 627         &dev_attr_authorized.attr,
 628         &dev_attr_remove.attr,
 629         NULL,
 630 };
 631 static struct attribute_group dev_attr_grp = {
 632         .attrs = dev_attrs,
 633 };
 634
 635 /* When modifying this list, be sure to modify dev_string_attrs_are_visible()
 636  * accordingly.
 637  */
 638 static struct attribute *dev_string_attrs[] = {
 639         &dev_attr_manufacturer.attr,
 640         &dev_attr_product.attr,
 641         &dev_attr_serial.attr,
 642         NULL
 643 };
 644
 645 static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
 646                 struct attribute *a, int n)
 647 {
 648         struct device *dev = container_of(kobj, struct device, kobj);
 649         struct usb_device *udev = to_usb_device(dev);
 650
 651         if (a == &dev_attr_manufacturer.attr) {
 652                 if (udev->manufacturer == NULL)
 653                         return 0;
 654         } else if (a == &dev_attr_product.attr) {
 655                 if (udev->product == NULL)
 656                         return 0;
 657         } else if (a == &dev_attr_serial.attr) {
 658                 if (udev->serial == NULL)
 659                         return 0;
 660         }
 661         return a->mode;
 662 }
 663
 664 static struct attribute_group dev_string_attr_grp = {
 665         .attrs =        dev_string_attrs,
 666         .is_visible =   dev_string_attrs_are_visible,
 667 };
 668
 669 const struct attribute_group *usb_device_groups[] = {
 670         &dev_attr_grp,
 671         &dev_string_attr_grp,
 672         NULL
 673 };
 674
 675 /* Binary descriptors */
 676
 677 static ssize_t
 678 read_descriptors(struct file *filp, struct kobject *kobj,
 679                 struct bin_attribute *attr,
 680                 char *buf, loff_t off, size_t count)
 681 {
 682         struct device *dev = container_of(kobj, struct device, kobj);
 683         struct usb_device *udev = to_usb_device(dev);
 684         size_t nleft = count;
 685         size_t srclen, n;
 686         int cfgno;
 687         void *src;
 688
 689         /* The binary attribute begins with the device descriptor.
 690          * Following that are the raw descriptor entries for all the
 691          * configurations (config plus subsidiary descriptors).
 692          */
 693         for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
 694                         nleft > 0; ++cfgno) {
 695                 if (cfgno < 0) {
 696                         src = &udev->descriptor;
 697                         srclen = sizeof(struct usb_device_descriptor);
 698                 } else {
 699                         src = udev->rawdescriptors[cfgno];
 700                         srclen = __le16_to_cpu(udev->config[cfgno].desc.
 701                                         wTotalLength);
 702                 }
 703                 if (off < srclen) {
 704                         n = min(nleft, srclen - (size_t) off);
 705                         memcpy(buf, src + off, n);
 706                         nleft -= n;
 707                         buf += n;
 708                         off = 0;
 709                 } else {
 710                         off -= srclen;
 711                 }
 712         }
 713         return count - nleft;
 714 }
 715
 716 static struct bin_attribute dev_bin_attr_descriptors = {
 717         .attr = {.name = "descriptors", .mode = 0444},
 718         .read = read_descriptors,
 719         .size = 18 + 65535,     /* dev descr + max-size raw descriptor */
 720 };
 721
 722 int usb_create_sysfs_dev_files(struct usb_device *udev)
 723 {
 724         struct device *dev = &udev->dev;
 725         int retval;
 726
 727         retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
 728         if (retval)
 729                 goto error;
 730
 731         retval = add_persist_attributes(dev);
 732         if (retval)
 733                 goto error;
 734
 735         retval = add_power_attributes(dev);
 736         if (retval)
 737                 goto error;
 738         return retval;
 739 error:
 740         usb_remove_sysfs_dev_files(udev);
 741         return retval;
 742 }
 743
 744 void usb_remove_sysfs_dev_files(struct usb_device *udev)
 745 {
 746         struct device *dev = &udev->dev;
 747
 748         remove_power_attributes(dev);
 749         remove_persist_attributes(dev);
 750         device_remove_bin_file(dev, &dev_bin_attr_descriptors);
 751 }
 752
 753 /* Interface Accociation Descriptor fields */
 754 #define usb_intf_assoc_attr(field, format_string)                       \
 755 static ssize_t                                                          \
 756 show_iad_##field(struct device *dev, struct device_attribute *attr,     \
 757                 char *buf)                                              \
 758 {                                                                       \
 759         struct usb_interface *intf = to_usb_interface(dev);             \
 760                                                                         \
 761         return sprintf(buf, format_string,                              \
 762                         intf->intf_assoc->field);                       \
 763 }                                                                       \
 764 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
 765
 766 usb_intf_assoc_attr(bFirstInterface, "%02x\n")
 767 usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
 768 usb_intf_assoc_attr(bFunctionClass, "%02x\n")
 769 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
 770 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
 771
 772 /* Interface fields */
 773 #define usb_intf_attr(field, format_string)                             \
 774 static ssize_t                                                          \
 775 show_##field(struct device *dev, struct device_attribute *attr, \
 776                 char *buf)                                              \
 777 {                                                                       \
 778         struct usb_interface *intf = to_usb_interface(dev);             \
 779                                                                         \
 780         return sprintf(buf, format_string,                              \
 781                         intf->cur_altsetting->desc.field);              \
 782 }                                                                       \
 783 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 784
 785 usb_intf_attr(bInterfaceNumber, "%02x\n")
 786 usb_intf_attr(bAlternateSetting, "%2d\n")
 787 usb_intf_attr(bNumEndpoints, "%02x\n")
 788 usb_intf_attr(bInterfaceClass, "%02x\n")
 789 usb_intf_attr(bInterfaceSubClass, "%02x\n")
 790 usb_intf_attr(bInterfaceProtocol, "%02x\n")
 791
 792 static ssize_t show_interface_string(struct device *dev,
 793                 struct device_attribute *attr, char *buf)
 794 {
 795         struct usb_interface *intf;
 796         char *string;
 797
 798         intf = to_usb_interface(dev);
 799         string = intf->cur_altsetting->string;
 800         barrier();              /* The altsetting might change! */
 801
 802         if (!string)
 803                 return 0;
 804         return sprintf(buf, "%s\n", string);
 805 }
 806 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
 807
 808 static ssize_t show_modalias(struct device *dev,
 809                 struct device_attribute *attr, char *buf)
 810 {
 811         struct usb_interface *intf;
 812         struct usb_device *udev;
 813         struct usb_host_interface *alt;
 814
 815         intf = to_usb_interface(dev);
 816         udev = interface_to_usbdev(intf);
 817         alt = intf->cur_altsetting;
 818
 819         return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
 820                         "ic%02Xisc%02Xip%02X\n",
 821                         le16_to_cpu(udev->descriptor.idVendor),
 822                         le16_to_cpu(udev->descriptor.idProduct),
 823                         le16_to_cpu(udev->descriptor.bcdDevice),
 824                         udev->descriptor.bDeviceClass,
 825                         udev->descriptor.bDeviceSubClass,
 826                         udev->descriptor.bDeviceProtocol,
 827                         alt->desc.bInterfaceClass,
 828                         alt->desc.bInterfaceSubClass,
 829                         alt->desc.bInterfaceProtocol);
 830 }
 831 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
 832
 833 static ssize_t show_supports_autosuspend(struct device *dev,
 834                 struct device_attribute *attr, char *buf)
 835 {
 836         struct usb_interface *intf;
 837         struct usb_device *udev;
 838         int ret;
 839
 840         intf = to_usb_interface(dev);
 841         udev = interface_to_usbdev(intf);
 842
 843         usb_lock_device(udev);
 844         /* Devices will be autosuspended even when an interface isn't claimed */
 845         if (!intf->dev.driver ||
 846                         to_usb_driver(intf->dev.driver)->supports_autosuspend)
 847                 ret = sprintf(buf, "%u\n", 1);
 848         else
 849                 ret = sprintf(buf, "%u\n", 0);
 850         usb_unlock_device(udev);
 851
 852         return ret;
 853 }
 854 static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
 855
 856 static struct attribute *intf_attrs[] = {
 857         &dev_attr_bInterfaceNumber.attr,
 858         &dev_attr_bAlternateSetting.attr,
 859         &dev_attr_bNumEndpoints.attr,
 860         &dev_attr_bInterfaceClass.attr,
 861         &dev_attr_bInterfaceSubClass.attr,
 862         &dev_attr_bInterfaceProtocol.attr,
 863         &dev_attr_modalias.attr,
 864         &dev_attr_supports_autosuspend.attr,
 865         NULL,
 866 };
 867 static struct attribute_group intf_attr_grp = {
 868         .attrs = intf_attrs,
 869 };
 870
 871 static struct attribute *intf_assoc_attrs[] = {
 872         &dev_attr_iad_bFirstInterface.attr,
 873         &dev_attr_iad_bInterfaceCount.attr,
 874         &dev_attr_iad_bFunctionClass.attr,
 875         &dev_attr_iad_bFunctionSubClass.attr,
 876         &dev_attr_iad_bFunctionProtocol.attr,
 877         NULL,
 878 };
 879
 880 static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
 881                 struct attribute *a, int n)
 882 {
 883         struct device *dev = container_of(kobj, struct device, kobj);
 884         struct usb_interface *intf = to_usb_interface(dev);
 885
 886         if (intf->intf_assoc == NULL)
 887                 return 0;
 888         return a->mode;
 889 }
 890
 891 static struct attribute_group intf_assoc_attr_grp = {
 892         .attrs =        intf_assoc_attrs,
 893         .is_visible =   intf_assoc_attrs_are_visible,
 894 };
 895
 896 const struct attribute_group *usb_interface_groups[] = {
 897         &intf_attr_grp,
 898         &intf_assoc_attr_grp,
 899         NULL
 900 };
 901
 902 void usb_create_sysfs_intf_files(struct usb_interface *intf)
 903 {
 904         struct usb_device *udev = interface_to_usbdev(intf);
 905         struct usb_host_interface *alt = intf->cur_altsetting;
 906
 907         if (intf->sysfs_files_created || intf->unregistering)
 908                 return;
 909
 910         if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
 911                 alt->string = usb_cache_string(udev, alt->desc.iInterface);
 912         if (alt->string && device_create_file(&intf->dev, &dev_attr_interface))
 913                 ;       /* We don't actually care if the function fails. */
 914         intf->sysfs_files_created = 1;
 915 }
 916
 917 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
 918 {
 919         if (!intf->sysfs_files_created)
 920                 return;
 921
 922         device_remove_file(&intf->dev, &dev_attr_interface);
 923         intf->sysfs_files_created = 0;
 924 }