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