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