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