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 void warn_level(void) { 387 static int level_warned; 388 389 if (!level_warned) { 390 level_warned = 1; 391 printk(KERN_WARNING "WARNING! power/level is deprecated; " 392 "use power/control instead\n"); 393 } 394 } 395 396 static ssize_t 397 show_level(struct device *dev, struct device_attribute *attr, char *buf) 398 { 399 struct usb_device *udev = to_usb_device(dev); 400 const char *p = auto_string; 401 402 warn_level(); 403 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto) 404 p = on_string; 405 return sprintf(buf, "%s\n", p); 406 } 407 408 static ssize_t 409 set_level(struct device *dev, struct device_attribute *attr, 410 const char *buf, size_t count) 411 { 412 struct usb_device *udev = to_usb_device(dev); 413 int len = count; 414 char *cp; 415 int rc = count; 416 417 warn_level(); 418 cp = memchr(buf, '\n', count); 419 if (cp) 420 len = cp - buf; 421 422 usb_lock_device(udev); 423 424 if (len == sizeof on_string - 1 && 425 strncmp(buf, on_string, len) == 0) 426 usb_disable_autosuspend(udev); 427 428 else if (len == sizeof auto_string - 1 && 429 strncmp(buf, auto_string, len) == 0) 430 usb_enable_autosuspend(udev); 431 432 else 433 rc = -EINVAL; 434 435 usb_unlock_device(udev); 436 return rc; 437 } 438 439 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level); 440 441 static int add_power_attributes(struct device *dev) 442 { 443 int rc = 0; 444 445 if (is_usb_device(dev)) { 446 rc = sysfs_add_file_to_group(&dev->kobj, 447 &dev_attr_autosuspend.attr, 448 power_group); 449 if (rc == 0) 450 rc = sysfs_add_file_to_group(&dev->kobj, 451 &dev_attr_level.attr, 452 power_group); 453 if (rc == 0) 454 rc = sysfs_add_file_to_group(&dev->kobj, 455 &dev_attr_connected_duration.attr, 456 power_group); 457 if (rc == 0) 458 rc = sysfs_add_file_to_group(&dev->kobj, 459 &dev_attr_active_duration.attr, 460 power_group); 461 } 462 return rc; 463 } 464 465 static void remove_power_attributes(struct device *dev) 466 { 467 sysfs_remove_file_from_group(&dev->kobj, 468 &dev_attr_active_duration.attr, 469 power_group); 470 sysfs_remove_file_from_group(&dev->kobj, 471 &dev_attr_connected_duration.attr, 472 power_group); 473 sysfs_remove_file_from_group(&dev->kobj, 474 &dev_attr_level.attr, 475 power_group); 476 sysfs_remove_file_from_group(&dev->kobj, 477 &dev_attr_autosuspend.attr, 478 power_group); 479 } 480 481 #else 482 483 #define add_power_attributes(dev) 0 484 #define remove_power_attributes(dev) do {} while (0) 485 486 #endif /* CONFIG_USB_SUSPEND */ 487 488 489 /* Descriptor fields */ 490 #define usb_descriptor_attr_le16(field, format_string) \ 491 static ssize_t \ 492 show_##field(struct device *dev, struct device_attribute *attr, \ 493 char *buf) \ 494 { \ 495 struct usb_device *udev; \ 496 \ 497 udev = to_usb_device(dev); \ 498 return sprintf(buf, format_string, \ 499 le16_to_cpu(udev->descriptor.field)); \ 500 } \ 501 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 502 503 usb_descriptor_attr_le16(idVendor, "%04x\n") 504 usb_descriptor_attr_le16(idProduct, "%04x\n") 505 usb_descriptor_attr_le16(bcdDevice, "%04x\n") 506 507 #define usb_descriptor_attr(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, udev->descriptor.field); \ 516 } \ 517 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 518 519 usb_descriptor_attr(bDeviceClass, "%02x\n") 520 usb_descriptor_attr(bDeviceSubClass, "%02x\n") 521 usb_descriptor_attr(bDeviceProtocol, "%02x\n") 522 usb_descriptor_attr(bNumConfigurations, "%d\n") 523 usb_descriptor_attr(bMaxPacketSize0, "%d\n") 524 525 526 527 /* show if the device is authorized (1) or not (0) */ 528 static ssize_t usb_dev_authorized_show(struct device *dev, 529 struct device_attribute *attr, 530 char *buf) 531 { 532 struct usb_device *usb_dev = to_usb_device(dev); 533 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized); 534 } 535 536 537 /* 538 * Authorize a device to be used in the system 539 * 540 * Writing a 0 deauthorizes the device, writing a 1 authorizes it. 541 */ 542 static ssize_t usb_dev_authorized_store(struct device *dev, 543 struct device_attribute *attr, 544 const char *buf, size_t size) 545 { 546 ssize_t result; 547 struct usb_device *usb_dev = to_usb_device(dev); 548 unsigned val; 549 result = sscanf(buf, "%u\n", &val); 550 if (result != 1) 551 result = -EINVAL; 552 else if (val == 0) 553 result = usb_deauthorize_device(usb_dev); 554 else 555 result = usb_authorize_device(usb_dev); 556 return result < 0? result : size; 557 } 558 559 static DEVICE_ATTR(authorized, 0644, 560 usb_dev_authorized_show, usb_dev_authorized_store); 561 562 /* "Safely remove a device" */ 563 static ssize_t usb_remove_store(struct device *dev, 564 struct device_attribute *attr, 565 const char *buf, size_t count) 566 { 567 struct usb_device *udev = to_usb_device(dev); 568 int rc = 0; 569 570 usb_lock_device(udev); 571 if (udev->state != USB_STATE_NOTATTACHED) { 572 573 /* To avoid races, first unconfigure and then remove */ 574 usb_set_configuration(udev, -1); 575 rc = usb_remove_device(udev); 576 } 577 if (rc == 0) 578 rc = count; 579 usb_unlock_device(udev); 580 return rc; 581 } 582 static DEVICE_ATTR(remove, 0200, NULL, usb_remove_store); 583 584 585 static struct attribute *dev_attrs[] = { 586 /* current configuration's attributes */ 587 &dev_attr_configuration.attr, 588 &dev_attr_bNumInterfaces.attr, 589 &dev_attr_bConfigurationValue.attr, 590 &dev_attr_bmAttributes.attr, 591 &dev_attr_bMaxPower.attr, 592 /* device attributes */ 593 &dev_attr_urbnum.attr, 594 &dev_attr_idVendor.attr, 595 &dev_attr_idProduct.attr, 596 &dev_attr_bcdDevice.attr, 597 &dev_attr_bDeviceClass.attr, 598 &dev_attr_bDeviceSubClass.attr, 599 &dev_attr_bDeviceProtocol.attr, 600 &dev_attr_bNumConfigurations.attr, 601 &dev_attr_bMaxPacketSize0.attr, 602 &dev_attr_speed.attr, 603 &dev_attr_busnum.attr, 604 &dev_attr_devnum.attr, 605 &dev_attr_devpath.attr, 606 &dev_attr_version.attr, 607 &dev_attr_maxchild.attr, 608 &dev_attr_quirks.attr, 609 &dev_attr_avoid_reset_quirk.attr, 610 &dev_attr_authorized.attr, 611 &dev_attr_remove.attr, 612 NULL, 613 }; 614 static struct attribute_group dev_attr_grp = { 615 .attrs = dev_attrs, 616 }; 617 618 /* When modifying this list, be sure to modify dev_string_attrs_are_visible() 619 * accordingly. 620 */ 621 static struct attribute *dev_string_attrs[] = { 622 &dev_attr_manufacturer.attr, 623 &dev_attr_product.attr, 624 &dev_attr_serial.attr, 625 NULL 626 }; 627 628 static mode_t dev_string_attrs_are_visible(struct kobject *kobj, 629 struct attribute *a, int n) 630 { 631 struct device *dev = container_of(kobj, struct device, kobj); 632 struct usb_device *udev = to_usb_device(dev); 633 634 if (a == &dev_attr_manufacturer.attr) { 635 if (udev->manufacturer == NULL) 636 return 0; 637 } else if (a == &dev_attr_product.attr) { 638 if (udev->product == NULL) 639 return 0; 640 } else if (a == &dev_attr_serial.attr) { 641 if (udev->serial == NULL) 642 return 0; 643 } 644 return a->mode; 645 } 646 647 static struct attribute_group dev_string_attr_grp = { 648 .attrs = dev_string_attrs, 649 .is_visible = dev_string_attrs_are_visible, 650 }; 651 652 const struct attribute_group *usb_device_groups[] = { 653 &dev_attr_grp, 654 &dev_string_attr_grp, 655 NULL 656 }; 657 658 /* Binary descriptors */ 659 660 static ssize_t 661 read_descriptors(struct file *filp, struct kobject *kobj, 662 struct bin_attribute *attr, 663 char *buf, loff_t off, size_t count) 664 { 665 struct device *dev = container_of(kobj, struct device, kobj); 666 struct usb_device *udev = to_usb_device(dev); 667 size_t nleft = count; 668 size_t srclen, n; 669 int cfgno; 670 void *src; 671 672 /* The binary attribute begins with the device descriptor. 673 * Following that are the raw descriptor entries for all the 674 * configurations (config plus subsidiary descriptors). 675 */ 676 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations && 677 nleft > 0; ++cfgno) { 678 if (cfgno < 0) { 679 src = &udev->descriptor; 680 srclen = sizeof(struct usb_device_descriptor); 681 } else { 682 src = udev->rawdescriptors[cfgno]; 683 srclen = __le16_to_cpu(udev->config[cfgno].desc. 684 wTotalLength); 685 } 686 if (off < srclen) { 687 n = min(nleft, srclen - (size_t) off); 688 memcpy(buf, src + off, n); 689 nleft -= n; 690 buf += n; 691 off = 0; 692 } else { 693 off -= srclen; 694 } 695 } 696 return count - nleft; 697 } 698 699 static struct bin_attribute dev_bin_attr_descriptors = { 700 .attr = {.name = "descriptors", .mode = 0444}, 701 .read = read_descriptors, 702 .size = 18 + 65535, /* dev descr + max-size raw descriptor */ 703 }; 704 705 int usb_create_sysfs_dev_files(struct usb_device *udev) 706 { 707 struct device *dev = &udev->dev; 708 int retval; 709 710 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors); 711 if (retval) 712 goto error; 713 714 retval = add_persist_attributes(dev); 715 if (retval) 716 goto error; 717 718 retval = add_power_attributes(dev); 719 if (retval) 720 goto error; 721 return retval; 722 error: 723 usb_remove_sysfs_dev_files(udev); 724 return retval; 725 } 726 727 void usb_remove_sysfs_dev_files(struct usb_device *udev) 728 { 729 struct device *dev = &udev->dev; 730 731 remove_power_attributes(dev); 732 remove_persist_attributes(dev); 733 device_remove_bin_file(dev, &dev_bin_attr_descriptors); 734 } 735 736 /* Interface Accociation Descriptor fields */ 737 #define usb_intf_assoc_attr(field, format_string) \ 738 static ssize_t \ 739 show_iad_##field(struct device *dev, struct device_attribute *attr, \ 740 char *buf) \ 741 { \ 742 struct usb_interface *intf = to_usb_interface(dev); \ 743 \ 744 return sprintf(buf, format_string, \ 745 intf->intf_assoc->field); \ 746 } \ 747 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL); 748 749 usb_intf_assoc_attr(bFirstInterface, "%02x\n") 750 usb_intf_assoc_attr(bInterfaceCount, "%02d\n") 751 usb_intf_assoc_attr(bFunctionClass, "%02x\n") 752 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n") 753 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n") 754 755 /* Interface fields */ 756 #define usb_intf_attr(field, format_string) \ 757 static ssize_t \ 758 show_##field(struct device *dev, struct device_attribute *attr, \ 759 char *buf) \ 760 { \ 761 struct usb_interface *intf = to_usb_interface(dev); \ 762 \ 763 return sprintf(buf, format_string, \ 764 intf->cur_altsetting->desc.field); \ 765 } \ 766 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 767 768 usb_intf_attr(bInterfaceNumber, "%02x\n") 769 usb_intf_attr(bAlternateSetting, "%2d\n") 770 usb_intf_attr(bNumEndpoints, "%02x\n") 771 usb_intf_attr(bInterfaceClass, "%02x\n") 772 usb_intf_attr(bInterfaceSubClass, "%02x\n") 773 usb_intf_attr(bInterfaceProtocol, "%02x\n") 774 775 static ssize_t show_interface_string(struct device *dev, 776 struct device_attribute *attr, char *buf) 777 { 778 struct usb_interface *intf; 779 char *string; 780 781 intf = to_usb_interface(dev); 782 string = intf->cur_altsetting->string; 783 barrier(); /* The altsetting might change! */ 784 785 if (!string) 786 return 0; 787 return sprintf(buf, "%s\n", string); 788 } 789 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL); 790 791 static ssize_t show_modalias(struct device *dev, 792 struct device_attribute *attr, char *buf) 793 { 794 struct usb_interface *intf; 795 struct usb_device *udev; 796 struct usb_host_interface *alt; 797 798 intf = to_usb_interface(dev); 799 udev = interface_to_usbdev(intf); 800 alt = intf->cur_altsetting; 801 802 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X" 803 "ic%02Xisc%02Xip%02X\n", 804 le16_to_cpu(udev->descriptor.idVendor), 805 le16_to_cpu(udev->descriptor.idProduct), 806 le16_to_cpu(udev->descriptor.bcdDevice), 807 udev->descriptor.bDeviceClass, 808 udev->descriptor.bDeviceSubClass, 809 udev->descriptor.bDeviceProtocol, 810 alt->desc.bInterfaceClass, 811 alt->desc.bInterfaceSubClass, 812 alt->desc.bInterfaceProtocol); 813 } 814 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); 815 816 static ssize_t show_supports_autosuspend(struct device *dev, 817 struct device_attribute *attr, char *buf) 818 { 819 struct usb_interface *intf; 820 struct usb_device *udev; 821 int ret; 822 823 intf = to_usb_interface(dev); 824 udev = interface_to_usbdev(intf); 825 826 usb_lock_device(udev); 827 /* Devices will be autosuspended even when an interface isn't claimed */ 828 if (!intf->dev.driver || 829 to_usb_driver(intf->dev.driver)->supports_autosuspend) 830 ret = sprintf(buf, "%u\n", 1); 831 else 832 ret = sprintf(buf, "%u\n", 0); 833 usb_unlock_device(udev); 834 835 return ret; 836 } 837 static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL); 838 839 static struct attribute *intf_attrs[] = { 840 &dev_attr_bInterfaceNumber.attr, 841 &dev_attr_bAlternateSetting.attr, 842 &dev_attr_bNumEndpoints.attr, 843 &dev_attr_bInterfaceClass.attr, 844 &dev_attr_bInterfaceSubClass.attr, 845 &dev_attr_bInterfaceProtocol.attr, 846 &dev_attr_modalias.attr, 847 &dev_attr_supports_autosuspend.attr, 848 NULL, 849 }; 850 static struct attribute_group intf_attr_grp = { 851 .attrs = intf_attrs, 852 }; 853 854 static struct attribute *intf_assoc_attrs[] = { 855 &dev_attr_iad_bFirstInterface.attr, 856 &dev_attr_iad_bInterfaceCount.attr, 857 &dev_attr_iad_bFunctionClass.attr, 858 &dev_attr_iad_bFunctionSubClass.attr, 859 &dev_attr_iad_bFunctionProtocol.attr, 860 NULL, 861 }; 862 863 static mode_t intf_assoc_attrs_are_visible(struct kobject *kobj, 864 struct attribute *a, int n) 865 { 866 struct device *dev = container_of(kobj, struct device, kobj); 867 struct usb_interface *intf = to_usb_interface(dev); 868 869 if (intf->intf_assoc == NULL) 870 return 0; 871 return a->mode; 872 } 873 874 static struct attribute_group intf_assoc_attr_grp = { 875 .attrs = intf_assoc_attrs, 876 .is_visible = intf_assoc_attrs_are_visible, 877 }; 878 879 const struct attribute_group *usb_interface_groups[] = { 880 &intf_attr_grp, 881 &intf_assoc_attr_grp, 882 NULL 883 }; 884 885 int usb_create_sysfs_intf_files(struct usb_interface *intf) 886 { 887 struct usb_device *udev = interface_to_usbdev(intf); 888 struct usb_host_interface *alt = intf->cur_altsetting; 889 int retval; 890 891 if (intf->sysfs_files_created || intf->unregistering) 892 return 0; 893 894 if (alt->string == NULL && 895 !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS)) 896 alt->string = usb_cache_string(udev, alt->desc.iInterface); 897 if (alt->string) 898 retval = device_create_file(&intf->dev, &dev_attr_interface); 899 intf->sysfs_files_created = 1; 900 return 0; 901 } 902 903 void usb_remove_sysfs_intf_files(struct usb_interface *intf) 904 { 905 if (!intf->sysfs_files_created) 906 return; 907 908 device_remove_file(&intf->dev, &dev_attr_interface); 909 intf->sysfs_files_created = 0; 910 } 911