1 /* 2 * drivers/usb/core/sysfs.c 3 * 4 * (C) Copyright 2002 David Brownell 5 * (C) Copyright 2002,2004 Greg Kroah-Hartman 6 * (C) Copyright 2002,2004 IBM Corp. 7 * 8 * All of the sysfs file attributes for usb devices and interfaces. 9 * 10 */ 11 12 13 #include <linux/kernel.h> 14 #include <linux/string.h> 15 #include <linux/usb.h> 16 #include <linux/usb/quirks.h> 17 #include "usb.h" 18 19 /* Active configuration fields */ 20 #define usb_actconfig_show(field, multiplier, format_string) \ 21 static ssize_t show_##field(struct device *dev, \ 22 struct device_attribute *attr, char *buf) \ 23 { \ 24 struct usb_device *udev; \ 25 struct usb_host_config *actconfig; \ 26 \ 27 udev = to_usb_device(dev); \ 28 actconfig = udev->actconfig; \ 29 if (actconfig) \ 30 return sprintf(buf, format_string, \ 31 actconfig->desc.field * multiplier); \ 32 else \ 33 return 0; \ 34 } \ 35 36 #define usb_actconfig_attr(field, multiplier, format_string) \ 37 usb_actconfig_show(field, multiplier, format_string) \ 38 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 39 40 usb_actconfig_attr(bNumInterfaces, 1, "%2d\n") 41 usb_actconfig_attr(bmAttributes, 1, "%2x\n") 42 usb_actconfig_attr(bMaxPower, 2, "%3dmA\n") 43 44 static ssize_t show_configuration_string(struct device *dev, 45 struct device_attribute *attr, char *buf) 46 { 47 struct usb_device *udev; 48 struct usb_host_config *actconfig; 49 50 udev = to_usb_device(dev); 51 actconfig = udev->actconfig; 52 if ((!actconfig) || (!actconfig->string)) 53 return 0; 54 return sprintf(buf, "%s\n", actconfig->string); 55 } 56 static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL); 57 58 /* configuration value is always present, and r/w */ 59 usb_actconfig_show(bConfigurationValue, 1, "%u\n"); 60 61 static ssize_t 62 set_bConfigurationValue(struct device *dev, struct device_attribute *attr, 63 const char *buf, size_t count) 64 { 65 struct usb_device *udev = to_usb_device(dev); 66 int config, value; 67 68 if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255) 69 return -EINVAL; 70 usb_lock_device(udev); 71 value = usb_set_configuration(udev, config); 72 usb_unlock_device(udev); 73 return (value < 0) ? value : count; 74 } 75 76 static DEVICE_ATTR(bConfigurationValue, S_IRUGO | S_IWUSR, 77 show_bConfigurationValue, set_bConfigurationValue); 78 79 /* String fields */ 80 #define usb_string_attr(name) \ 81 static ssize_t show_##name(struct device *dev, \ 82 struct device_attribute *attr, char *buf) \ 83 { \ 84 struct usb_device *udev; \ 85 int retval; \ 86 \ 87 udev = to_usb_device(dev); \ 88 usb_lock_device(udev); \ 89 retval = sprintf(buf, "%s\n", udev->name); \ 90 usb_unlock_device(udev); \ 91 return retval; \ 92 } \ 93 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); 94 95 usb_string_attr(product); 96 usb_string_attr(manufacturer); 97 usb_string_attr(serial); 98 99 static ssize_t 100 show_speed(struct device *dev, struct device_attribute *attr, char *buf) 101 { 102 struct usb_device *udev; 103 char *speed; 104 105 udev = to_usb_device(dev); 106 107 switch (udev->speed) { 108 case USB_SPEED_LOW: 109 speed = "1.5"; 110 break; 111 case USB_SPEED_UNKNOWN: 112 case USB_SPEED_FULL: 113 speed = "12"; 114 break; 115 case USB_SPEED_HIGH: 116 speed = "480"; 117 break; 118 case USB_SPEED_WIRELESS: 119 speed = "480"; 120 break; 121 case USB_SPEED_SUPER: 122 speed = "5000"; 123 break; 124 default: 125 speed = "unknown"; 126 } 127 return sprintf(buf, "%s\n", speed); 128 } 129 static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL); 130 131 static ssize_t 132 show_busnum(struct device *dev, struct device_attribute *attr, char *buf) 133 { 134 struct usb_device *udev; 135 136 udev = to_usb_device(dev); 137 return sprintf(buf, "%d\n", udev->bus->busnum); 138 } 139 static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL); 140 141 static ssize_t 142 show_devnum(struct device *dev, struct device_attribute *attr, char *buf) 143 { 144 struct usb_device *udev; 145 146 udev = to_usb_device(dev); 147 return sprintf(buf, "%d\n", udev->devnum); 148 } 149 static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL); 150 151 static ssize_t 152 show_devpath(struct device *dev, struct device_attribute *attr, char *buf) 153 { 154 struct usb_device *udev; 155 156 udev = to_usb_device(dev); 157 return sprintf(buf, "%s\n", udev->devpath); 158 } 159 static DEVICE_ATTR(devpath, S_IRUGO, show_devpath, NULL); 160 161 static ssize_t 162 show_version(struct device *dev, struct device_attribute *attr, char *buf) 163 { 164 struct usb_device *udev; 165 u16 bcdUSB; 166 167 udev = to_usb_device(dev); 168 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB); 169 return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff); 170 } 171 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); 172 173 static ssize_t 174 show_maxchild(struct device *dev, struct device_attribute *attr, char *buf) 175 { 176 struct usb_device *udev; 177 178 udev = to_usb_device(dev); 179 return sprintf(buf, "%d\n", udev->maxchild); 180 } 181 static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL); 182 183 static ssize_t 184 show_quirks(struct device *dev, struct device_attribute *attr, char *buf) 185 { 186 struct usb_device *udev; 187 188 udev = to_usb_device(dev); 189 return sprintf(buf, "0x%x\n", udev->quirks); 190 } 191 static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL); 192 193 static ssize_t 194 show_avoid_reset_quirk(struct device *dev, struct device_attribute *attr, char *buf) 195 { 196 struct usb_device *udev; 197 198 udev = to_usb_device(dev); 199 return sprintf(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET_MORPHS)); 200 } 201 202 static ssize_t 203 set_avoid_reset_quirk(struct device *dev, struct device_attribute *attr, 204 const char *buf, size_t count) 205 { 206 struct usb_device *udev = to_usb_device(dev); 207 int config; 208 209 if (sscanf(buf, "%d", &config) != 1 || config < 0 || config > 1) 210 return -EINVAL; 211 usb_lock_device(udev); 212 if (config) 213 udev->quirks |= USB_QUIRK_RESET_MORPHS; 214 else 215 udev->quirks &= ~USB_QUIRK_RESET_MORPHS; 216 usb_unlock_device(udev); 217 return count; 218 } 219 220 static DEVICE_ATTR(avoid_reset_quirk, S_IRUGO | S_IWUSR, 221 show_avoid_reset_quirk, set_avoid_reset_quirk); 222 223 static ssize_t 224 show_urbnum(struct device *dev, struct device_attribute *attr, char *buf) 225 { 226 struct usb_device *udev; 227 228 udev = to_usb_device(dev); 229 return sprintf(buf, "%d\n", atomic_read(&udev->urbnum)); 230 } 231 static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL); 232 233 234 #ifdef CONFIG_PM 235 236 static ssize_t 237 show_persist(struct device *dev, struct device_attribute *attr, char *buf) 238 { 239 struct usb_device *udev = to_usb_device(dev); 240 241 return sprintf(buf, "%d\n", udev->persist_enabled); 242 } 243 244 static ssize_t 245 set_persist(struct device *dev, struct device_attribute *attr, 246 const char *buf, size_t count) 247 { 248 struct usb_device *udev = to_usb_device(dev); 249 int value; 250 251 /* Hubs are always enabled for USB_PERSIST */ 252 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) 253 return -EPERM; 254 255 if (sscanf(buf, "%d", &value) != 1) 256 return -EINVAL; 257 258 usb_lock_device(udev); 259 udev->persist_enabled = !!value; 260 usb_unlock_device(udev); 261 return count; 262 } 263 264 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist); 265 266 static int add_persist_attributes(struct device *dev) 267 { 268 int rc = 0; 269 270 if (is_usb_device(dev)) { 271 struct usb_device *udev = to_usb_device(dev); 272 273 /* Hubs are automatically enabled for USB_PERSIST, 274 * no point in creating the attribute file. 275 */ 276 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB) 277 rc = sysfs_add_file_to_group(&dev->kobj, 278 &dev_attr_persist.attr, 279 power_group_name); 280 } 281 return rc; 282 } 283 284 static void remove_persist_attributes(struct device *dev) 285 { 286 sysfs_remove_file_from_group(&dev->kobj, 287 &dev_attr_persist.attr, 288 power_group_name); 289 } 290 #else 291 292 #define add_persist_attributes(dev) 0 293 #define remove_persist_attributes(dev) do {} while (0) 294 295 #endif /* CONFIG_PM */ 296 297 #ifdef CONFIG_USB_SUSPEND 298 299 static ssize_t 300 show_connected_duration(struct device *dev, struct device_attribute *attr, 301 char *buf) 302 { 303 struct usb_device *udev = to_usb_device(dev); 304 305 return sprintf(buf, "%u\n", 306 jiffies_to_msecs(jiffies - udev->connect_time)); 307 } 308 309 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL); 310 311 /* 312 * If the device is resumed, the last time the device was suspended has 313 * been pre-subtracted from active_duration. We add the current time to 314 * get the duration that the device was actually active. 315 * 316 * If the device is suspended, the active_duration is up-to-date. 317 */ 318 static ssize_t 319 show_active_duration(struct device *dev, struct device_attribute *attr, 320 char *buf) 321 { 322 struct usb_device *udev = to_usb_device(dev); 323 int duration; 324 325 if (udev->state != USB_STATE_SUSPENDED) 326 duration = jiffies_to_msecs(jiffies + udev->active_duration); 327 else 328 duration = jiffies_to_msecs(udev->active_duration); 329 return sprintf(buf, "%u\n", duration); 330 } 331 332 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL); 333 334 static ssize_t 335 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf) 336 { 337 return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000); 338 } 339 340 static ssize_t 341 set_autosuspend(struct device *dev, struct device_attribute *attr, 342 const char *buf, size_t count) 343 { 344 int value; 345 346 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 || 347 value <= -INT_MAX/1000) 348 return -EINVAL; 349 350 pm_runtime_set_autosuspend_delay(dev, value * 1000); 351 return count; 352 } 353 354 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR, 355 show_autosuspend, set_autosuspend); 356 357 static const char on_string[] = "on"; 358 static const char auto_string[] = "auto"; 359 360 static void warn_level(void) { 361 static int level_warned; 362 363 if (!level_warned) { 364 level_warned = 1; 365 printk(KERN_WARNING "WARNING! power/level is deprecated; " 366 "use power/control instead\n"); 367 } 368 } 369 370 static ssize_t 371 show_level(struct device *dev, struct device_attribute *attr, char *buf) 372 { 373 struct usb_device *udev = to_usb_device(dev); 374 const char *p = auto_string; 375 376 warn_level(); 377 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto) 378 p = on_string; 379 return sprintf(buf, "%s\n", p); 380 } 381 382 static ssize_t 383 set_level(struct device *dev, struct device_attribute *attr, 384 const char *buf, size_t count) 385 { 386 struct usb_device *udev = to_usb_device(dev); 387 int len = count; 388 char *cp; 389 int rc = count; 390 391 warn_level(); 392 cp = memchr(buf, '\n', count); 393 if (cp) 394 len = cp - buf; 395 396 usb_lock_device(udev); 397 398 if (len == sizeof on_string - 1 && 399 strncmp(buf, on_string, len) == 0) 400 usb_disable_autosuspend(udev); 401 402 else if (len == sizeof auto_string - 1 && 403 strncmp(buf, auto_string, len) == 0) 404 usb_enable_autosuspend(udev); 405 406 else 407 rc = -EINVAL; 408 409 usb_unlock_device(udev); 410 return rc; 411 } 412 413 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level); 414 415 static ssize_t 416 show_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr, 417 char *buf) 418 { 419 struct usb_device *udev = to_usb_device(dev); 420 const char *p; 421 422 if (udev->usb2_hw_lpm_enabled == 1) 423 p = "enabled"; 424 else 425 p = "disabled"; 426 427 return sprintf(buf, "%s\n", p); 428 } 429 430 static ssize_t 431 set_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr, 432 const char *buf, size_t count) 433 { 434 struct usb_device *udev = to_usb_device(dev); 435 bool value; 436 int ret; 437 438 usb_lock_device(udev); 439 440 ret = strtobool(buf, &value); 441 442 if (!ret) 443 ret = usb_set_usb2_hardware_lpm(udev, value); 444 445 usb_unlock_device(udev); 446 447 if (!ret) 448 return count; 449 450 return ret; 451 } 452 453 static DEVICE_ATTR(usb2_hardware_lpm, S_IRUGO | S_IWUSR, show_usb2_hardware_lpm, 454 set_usb2_hardware_lpm); 455 456 static struct attribute *usb2_hardware_lpm_attr[] = { 457 &dev_attr_usb2_hardware_lpm.attr, 458 NULL, 459 }; 460 static struct attribute_group usb2_hardware_lpm_attr_group = { 461 .name = power_group_name, 462 .attrs = usb2_hardware_lpm_attr, 463 }; 464 465 static struct attribute *power_attrs[] = { 466 &dev_attr_autosuspend.attr, 467 &dev_attr_level.attr, 468 &dev_attr_connected_duration.attr, 469 &dev_attr_active_duration.attr, 470 NULL, 471 }; 472 static struct attribute_group power_attr_group = { 473 .name = power_group_name, 474 .attrs = power_attrs, 475 }; 476 477 static int add_power_attributes(struct device *dev) 478 { 479 int rc = 0; 480 481 if (is_usb_device(dev)) { 482 struct usb_device *udev = to_usb_device(dev); 483 rc = sysfs_merge_group(&dev->kobj, &power_attr_group); 484 if (udev->usb2_hw_lpm_capable == 1) 485 rc = sysfs_merge_group(&dev->kobj, 486 &usb2_hardware_lpm_attr_group); 487 } 488 489 return rc; 490 } 491 492 static void remove_power_attributes(struct device *dev) 493 { 494 sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group); 495 sysfs_unmerge_group(&dev->kobj, &power_attr_group); 496 } 497 498 #else 499 500 #define add_power_attributes(dev) 0 501 #define remove_power_attributes(dev) do {} while (0) 502 503 #endif /* CONFIG_USB_SUSPEND */ 504 505 506 /* Descriptor fields */ 507 #define usb_descriptor_attr_le16(field, format_string) \ 508 static ssize_t \ 509 show_##field(struct device *dev, struct device_attribute *attr, \ 510 char *buf) \ 511 { \ 512 struct usb_device *udev; \ 513 \ 514 udev = to_usb_device(dev); \ 515 return sprintf(buf, format_string, \ 516 le16_to_cpu(udev->descriptor.field)); \ 517 } \ 518 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 519 520 usb_descriptor_attr_le16(idVendor, "%04x\n") 521 usb_descriptor_attr_le16(idProduct, "%04x\n") 522 usb_descriptor_attr_le16(bcdDevice, "%04x\n") 523 524 #define usb_descriptor_attr(field, format_string) \ 525 static ssize_t \ 526 show_##field(struct device *dev, struct device_attribute *attr, \ 527 char *buf) \ 528 { \ 529 struct usb_device *udev; \ 530 \ 531 udev = to_usb_device(dev); \ 532 return sprintf(buf, format_string, udev->descriptor.field); \ 533 } \ 534 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 535 536 usb_descriptor_attr(bDeviceClass, "%02x\n") 537 usb_descriptor_attr(bDeviceSubClass, "%02x\n") 538 usb_descriptor_attr(bDeviceProtocol, "%02x\n") 539 usb_descriptor_attr(bNumConfigurations, "%d\n") 540 usb_descriptor_attr(bMaxPacketSize0, "%d\n") 541 542 543 544 /* show if the device is authorized (1) or not (0) */ 545 static ssize_t usb_dev_authorized_show(struct device *dev, 546 struct device_attribute *attr, 547 char *buf) 548 { 549 struct usb_device *usb_dev = to_usb_device(dev); 550 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized); 551 } 552 553 554 /* 555 * Authorize a device to be used in the system 556 * 557 * Writing a 0 deauthorizes the device, writing a 1 authorizes it. 558 */ 559 static ssize_t usb_dev_authorized_store(struct device *dev, 560 struct device_attribute *attr, 561 const char *buf, size_t size) 562 { 563 ssize_t result; 564 struct usb_device *usb_dev = to_usb_device(dev); 565 unsigned val; 566 result = sscanf(buf, "%u\n", &val); 567 if (result != 1) 568 result = -EINVAL; 569 else if (val == 0) 570 result = usb_deauthorize_device(usb_dev); 571 else 572 result = usb_authorize_device(usb_dev); 573 return result < 0? result : size; 574 } 575 576 static DEVICE_ATTR(authorized, 0644, 577 usb_dev_authorized_show, usb_dev_authorized_store); 578 579 /* "Safely remove a device" */ 580 static ssize_t usb_remove_store(struct device *dev, 581 struct device_attribute *attr, 582 const char *buf, size_t count) 583 { 584 struct usb_device *udev = to_usb_device(dev); 585 int rc = 0; 586 587 usb_lock_device(udev); 588 if (udev->state != USB_STATE_NOTATTACHED) { 589 590 /* To avoid races, first unconfigure and then remove */ 591 usb_set_configuration(udev, -1); 592 rc = usb_remove_device(udev); 593 } 594 if (rc == 0) 595 rc = count; 596 usb_unlock_device(udev); 597 return rc; 598 } 599 static DEVICE_ATTR(remove, 0200, NULL, usb_remove_store); 600 601 602 static struct attribute *dev_attrs[] = { 603 /* current configuration's attributes */ 604 &dev_attr_configuration.attr, 605 &dev_attr_bNumInterfaces.attr, 606 &dev_attr_bConfigurationValue.attr, 607 &dev_attr_bmAttributes.attr, 608 &dev_attr_bMaxPower.attr, 609 /* device attributes */ 610 &dev_attr_urbnum.attr, 611 &dev_attr_idVendor.attr, 612 &dev_attr_idProduct.attr, 613 &dev_attr_bcdDevice.attr, 614 &dev_attr_bDeviceClass.attr, 615 &dev_attr_bDeviceSubClass.attr, 616 &dev_attr_bDeviceProtocol.attr, 617 &dev_attr_bNumConfigurations.attr, 618 &dev_attr_bMaxPacketSize0.attr, 619 &dev_attr_speed.attr, 620 &dev_attr_busnum.attr, 621 &dev_attr_devnum.attr, 622 &dev_attr_devpath.attr, 623 &dev_attr_version.attr, 624 &dev_attr_maxchild.attr, 625 &dev_attr_quirks.attr, 626 &dev_attr_avoid_reset_quirk.attr, 627 &dev_attr_authorized.attr, 628 &dev_attr_remove.attr, 629 NULL, 630 }; 631 static struct attribute_group dev_attr_grp = { 632 .attrs = dev_attrs, 633 }; 634 635 /* When modifying this list, be sure to modify dev_string_attrs_are_visible() 636 * accordingly. 637 */ 638 static struct attribute *dev_string_attrs[] = { 639 &dev_attr_manufacturer.attr, 640 &dev_attr_product.attr, 641 &dev_attr_serial.attr, 642 NULL 643 }; 644 645 static umode_t dev_string_attrs_are_visible(struct kobject *kobj, 646 struct attribute *a, int n) 647 { 648 struct device *dev = container_of(kobj, struct device, kobj); 649 struct usb_device *udev = to_usb_device(dev); 650 651 if (a == &dev_attr_manufacturer.attr) { 652 if (udev->manufacturer == NULL) 653 return 0; 654 } else if (a == &dev_attr_product.attr) { 655 if (udev->product == NULL) 656 return 0; 657 } else if (a == &dev_attr_serial.attr) { 658 if (udev->serial == NULL) 659 return 0; 660 } 661 return a->mode; 662 } 663 664 static struct attribute_group dev_string_attr_grp = { 665 .attrs = dev_string_attrs, 666 .is_visible = dev_string_attrs_are_visible, 667 }; 668 669 const struct attribute_group *usb_device_groups[] = { 670 &dev_attr_grp, 671 &dev_string_attr_grp, 672 NULL 673 }; 674 675 /* Binary descriptors */ 676 677 static ssize_t 678 read_descriptors(struct file *filp, struct kobject *kobj, 679 struct bin_attribute *attr, 680 char *buf, loff_t off, size_t count) 681 { 682 struct device *dev = container_of(kobj, struct device, kobj); 683 struct usb_device *udev = to_usb_device(dev); 684 size_t nleft = count; 685 size_t srclen, n; 686 int cfgno; 687 void *src; 688 689 /* The binary attribute begins with the device descriptor. 690 * Following that are the raw descriptor entries for all the 691 * configurations (config plus subsidiary descriptors). 692 */ 693 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations && 694 nleft > 0; ++cfgno) { 695 if (cfgno < 0) { 696 src = &udev->descriptor; 697 srclen = sizeof(struct usb_device_descriptor); 698 } else { 699 src = udev->rawdescriptors[cfgno]; 700 srclen = __le16_to_cpu(udev->config[cfgno].desc. 701 wTotalLength); 702 } 703 if (off < srclen) { 704 n = min(nleft, srclen - (size_t) off); 705 memcpy(buf, src + off, n); 706 nleft -= n; 707 buf += n; 708 off = 0; 709 } else { 710 off -= srclen; 711 } 712 } 713 return count - nleft; 714 } 715 716 static struct bin_attribute dev_bin_attr_descriptors = { 717 .attr = {.name = "descriptors", .mode = 0444}, 718 .read = read_descriptors, 719 .size = 18 + 65535, /* dev descr + max-size raw descriptor */ 720 }; 721 722 int usb_create_sysfs_dev_files(struct usb_device *udev) 723 { 724 struct device *dev = &udev->dev; 725 int retval; 726 727 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors); 728 if (retval) 729 goto error; 730 731 retval = add_persist_attributes(dev); 732 if (retval) 733 goto error; 734 735 retval = add_power_attributes(dev); 736 if (retval) 737 goto error; 738 return retval; 739 error: 740 usb_remove_sysfs_dev_files(udev); 741 return retval; 742 } 743 744 void usb_remove_sysfs_dev_files(struct usb_device *udev) 745 { 746 struct device *dev = &udev->dev; 747 748 remove_power_attributes(dev); 749 remove_persist_attributes(dev); 750 device_remove_bin_file(dev, &dev_bin_attr_descriptors); 751 } 752 753 /* Interface Accociation Descriptor fields */ 754 #define usb_intf_assoc_attr(field, format_string) \ 755 static ssize_t \ 756 show_iad_##field(struct device *dev, struct device_attribute *attr, \ 757 char *buf) \ 758 { \ 759 struct usb_interface *intf = to_usb_interface(dev); \ 760 \ 761 return sprintf(buf, format_string, \ 762 intf->intf_assoc->field); \ 763 } \ 764 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL); 765 766 usb_intf_assoc_attr(bFirstInterface, "%02x\n") 767 usb_intf_assoc_attr(bInterfaceCount, "%02d\n") 768 usb_intf_assoc_attr(bFunctionClass, "%02x\n") 769 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n") 770 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n") 771 772 /* Interface fields */ 773 #define usb_intf_attr(field, format_string) \ 774 static ssize_t \ 775 show_##field(struct device *dev, struct device_attribute *attr, \ 776 char *buf) \ 777 { \ 778 struct usb_interface *intf = to_usb_interface(dev); \ 779 \ 780 return sprintf(buf, format_string, \ 781 intf->cur_altsetting->desc.field); \ 782 } \ 783 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 784 785 usb_intf_attr(bInterfaceNumber, "%02x\n") 786 usb_intf_attr(bAlternateSetting, "%2d\n") 787 usb_intf_attr(bNumEndpoints, "%02x\n") 788 usb_intf_attr(bInterfaceClass, "%02x\n") 789 usb_intf_attr(bInterfaceSubClass, "%02x\n") 790 usb_intf_attr(bInterfaceProtocol, "%02x\n") 791 792 static ssize_t show_interface_string(struct device *dev, 793 struct device_attribute *attr, char *buf) 794 { 795 struct usb_interface *intf; 796 char *string; 797 798 intf = to_usb_interface(dev); 799 string = intf->cur_altsetting->string; 800 barrier(); /* The altsetting might change! */ 801 802 if (!string) 803 return 0; 804 return sprintf(buf, "%s\n", string); 805 } 806 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL); 807 808 static ssize_t show_modalias(struct device *dev, 809 struct device_attribute *attr, char *buf) 810 { 811 struct usb_interface *intf; 812 struct usb_device *udev; 813 struct usb_host_interface *alt; 814 815 intf = to_usb_interface(dev); 816 udev = interface_to_usbdev(intf); 817 alt = intf->cur_altsetting; 818 819 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X" 820 "ic%02Xisc%02Xip%02X\n", 821 le16_to_cpu(udev->descriptor.idVendor), 822 le16_to_cpu(udev->descriptor.idProduct), 823 le16_to_cpu(udev->descriptor.bcdDevice), 824 udev->descriptor.bDeviceClass, 825 udev->descriptor.bDeviceSubClass, 826 udev->descriptor.bDeviceProtocol, 827 alt->desc.bInterfaceClass, 828 alt->desc.bInterfaceSubClass, 829 alt->desc.bInterfaceProtocol); 830 } 831 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); 832 833 static ssize_t show_supports_autosuspend(struct device *dev, 834 struct device_attribute *attr, char *buf) 835 { 836 struct usb_interface *intf; 837 struct usb_device *udev; 838 int ret; 839 840 intf = to_usb_interface(dev); 841 udev = interface_to_usbdev(intf); 842 843 usb_lock_device(udev); 844 /* Devices will be autosuspended even when an interface isn't claimed */ 845 if (!intf->dev.driver || 846 to_usb_driver(intf->dev.driver)->supports_autosuspend) 847 ret = sprintf(buf, "%u\n", 1); 848 else 849 ret = sprintf(buf, "%u\n", 0); 850 usb_unlock_device(udev); 851 852 return ret; 853 } 854 static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL); 855 856 static struct attribute *intf_attrs[] = { 857 &dev_attr_bInterfaceNumber.attr, 858 &dev_attr_bAlternateSetting.attr, 859 &dev_attr_bNumEndpoints.attr, 860 &dev_attr_bInterfaceClass.attr, 861 &dev_attr_bInterfaceSubClass.attr, 862 &dev_attr_bInterfaceProtocol.attr, 863 &dev_attr_modalias.attr, 864 &dev_attr_supports_autosuspend.attr, 865 NULL, 866 }; 867 static struct attribute_group intf_attr_grp = { 868 .attrs = intf_attrs, 869 }; 870 871 static struct attribute *intf_assoc_attrs[] = { 872 &dev_attr_iad_bFirstInterface.attr, 873 &dev_attr_iad_bInterfaceCount.attr, 874 &dev_attr_iad_bFunctionClass.attr, 875 &dev_attr_iad_bFunctionSubClass.attr, 876 &dev_attr_iad_bFunctionProtocol.attr, 877 NULL, 878 }; 879 880 static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj, 881 struct attribute *a, int n) 882 { 883 struct device *dev = container_of(kobj, struct device, kobj); 884 struct usb_interface *intf = to_usb_interface(dev); 885 886 if (intf->intf_assoc == NULL) 887 return 0; 888 return a->mode; 889 } 890 891 static struct attribute_group intf_assoc_attr_grp = { 892 .attrs = intf_assoc_attrs, 893 .is_visible = intf_assoc_attrs_are_visible, 894 }; 895 896 const struct attribute_group *usb_interface_groups[] = { 897 &intf_attr_grp, 898 &intf_assoc_attr_grp, 899 NULL 900 }; 901 902 void usb_create_sysfs_intf_files(struct usb_interface *intf) 903 { 904 struct usb_device *udev = interface_to_usbdev(intf); 905 struct usb_host_interface *alt = intf->cur_altsetting; 906 907 if (intf->sysfs_files_created || intf->unregistering) 908 return; 909 910 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS)) 911 alt->string = usb_cache_string(udev, alt->desc.iInterface); 912 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface)) 913 ; /* We don't actually care if the function fails. */ 914 intf->sysfs_files_created = 1; 915 } 916 917 void usb_remove_sysfs_intf_files(struct usb_interface *intf) 918 { 919 if (!intf->sysfs_files_created) 920 return; 921 922 device_remove_file(&intf->dev, &dev_attr_interface); 923 intf->sysfs_files_created = 0; 924 } 925