2 * drivers/usb/core/sysfs.c
4 * (C) Copyright 2002 David Brownell
5 * (C) Copyright 2002,2004 Greg Kroah-Hartman
6 * (C) Copyright 2002,2004 IBM Corp.
8 * All of the sysfs file attributes for usb devices and interfaces.
13 #include <linux/kernel.h>
14 #include <linux/string.h>
15 #include <linux/usb.h>
16 #include <linux/usb/quirks.h>
19 /* Active configuration fields */
20 #define usb_actconfig_show(field, format_string) \
21 static ssize_t field##_show(struct device *dev, \
22 struct device_attribute *attr, char *buf) \
24 struct usb_device *udev; \
25 struct usb_host_config *actconfig; \
27 udev = to_usb_device(dev); \
28 actconfig = udev->actconfig; \
30 return sprintf(buf, format_string, \
31 actconfig->desc.field); \
36 #define usb_actconfig_attr(field, format_string) \
37 usb_actconfig_show(field, format_string) \
38 static DEVICE_ATTR_RO(field)
40 usb_actconfig_attr(bNumInterfaces, "%2d\n");
41 usb_actconfig_attr(bmAttributes, "%2x\n");
43 static ssize_t bMaxPower_show(struct device *dev,
44 struct device_attribute *attr, char *buf)
46 struct usb_device *udev;
47 struct usb_host_config *actconfig;
49 udev = to_usb_device(dev);
50 actconfig = udev->actconfig;
53 return sprintf(buf, "%dmA\n", usb_get_max_power(udev, actconfig));
55 static DEVICE_ATTR_RO(bMaxPower);
57 static ssize_t configuration_show(struct device *dev,
58 struct device_attribute *attr, char *buf)
60 struct usb_device *udev;
61 struct usb_host_config *actconfig;
63 udev = to_usb_device(dev);
64 actconfig = udev->actconfig;
65 if ((!actconfig) || (!actconfig->string))
67 return sprintf(buf, "%s\n", actconfig->string);
69 static DEVICE_ATTR_RO(configuration);
71 /* configuration value is always present, and r/w */
72 usb_actconfig_show(bConfigurationValue, "%u\n");
74 static ssize_t bConfigurationValue_store(struct device *dev,
75 struct device_attribute *attr,
76 const char *buf, size_t count)
78 struct usb_device *udev = to_usb_device(dev);
81 if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
83 usb_lock_device(udev);
84 value = usb_set_configuration(udev, config);
85 usb_unlock_device(udev);
86 return (value < 0) ? value : count;
88 static DEVICE_ATTR_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,
89 bConfigurationValue_show, bConfigurationValue_store);
92 #define usb_string_attr(name) \
93 static ssize_t name##_show(struct device *dev, \
94 struct device_attribute *attr, char *buf) \
96 struct usb_device *udev; \
99 udev = to_usb_device(dev); \
100 usb_lock_device(udev); \
101 retval = sprintf(buf, "%s\n", udev->name); \
102 usb_unlock_device(udev); \
105 static DEVICE_ATTR_RO(name)
107 usb_string_attr(product);
108 usb_string_attr(manufacturer);
109 usb_string_attr(serial);
111 static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
114 struct usb_device *udev;
117 udev = to_usb_device(dev);
119 switch (udev->speed) {
123 case USB_SPEED_UNKNOWN:
130 case USB_SPEED_WIRELESS:
133 case USB_SPEED_SUPER:
139 return sprintf(buf, "%s\n", speed);
141 static DEVICE_ATTR_RO(speed);
143 static ssize_t busnum_show(struct device *dev, struct device_attribute *attr,
146 struct usb_device *udev;
148 udev = to_usb_device(dev);
149 return sprintf(buf, "%d\n", udev->bus->busnum);
151 static DEVICE_ATTR_RO(busnum);
153 static ssize_t devnum_show(struct device *dev, struct device_attribute *attr,
156 struct usb_device *udev;
158 udev = to_usb_device(dev);
159 return sprintf(buf, "%d\n", udev->devnum);
161 static DEVICE_ATTR_RO(devnum);
163 static ssize_t devpath_show(struct device *dev, struct device_attribute *attr,
166 struct usb_device *udev;
168 udev = to_usb_device(dev);
169 return sprintf(buf, "%s\n", udev->devpath);
171 static DEVICE_ATTR_RO(devpath);
173 static ssize_t version_show(struct device *dev, struct device_attribute *attr,
176 struct usb_device *udev;
179 udev = to_usb_device(dev);
180 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
181 return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
183 static DEVICE_ATTR_RO(version);
185 static ssize_t maxchild_show(struct device *dev, struct device_attribute *attr,
188 struct usb_device *udev;
190 udev = to_usb_device(dev);
191 return sprintf(buf, "%d\n", udev->maxchild);
193 static DEVICE_ATTR_RO(maxchild);
195 static ssize_t quirks_show(struct device *dev, struct device_attribute *attr,
198 struct usb_device *udev;
200 udev = to_usb_device(dev);
201 return sprintf(buf, "0x%x\n", udev->quirks);
203 static DEVICE_ATTR_RO(quirks);
205 static ssize_t avoid_reset_quirk_show(struct device *dev,
206 struct device_attribute *attr, char *buf)
208 struct usb_device *udev;
210 udev = to_usb_device(dev);
211 return sprintf(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET));
214 static ssize_t avoid_reset_quirk_store(struct device *dev,
215 struct device_attribute *attr,
216 const char *buf, size_t count)
218 struct usb_device *udev = to_usb_device(dev);
221 if (sscanf(buf, "%d", &val) != 1 || val < 0 || val > 1)
223 usb_lock_device(udev);
225 udev->quirks |= USB_QUIRK_RESET;
227 udev->quirks &= ~USB_QUIRK_RESET;
228 usb_unlock_device(udev);
231 static DEVICE_ATTR_RW(avoid_reset_quirk);
233 static ssize_t urbnum_show(struct device *dev, struct device_attribute *attr,
236 struct usb_device *udev;
238 udev = to_usb_device(dev);
239 return sprintf(buf, "%d\n", atomic_read(&udev->urbnum));
241 static DEVICE_ATTR_RO(urbnum);
243 static ssize_t removable_show(struct device *dev, struct device_attribute *attr,
246 struct usb_device *udev;
249 udev = to_usb_device(dev);
251 switch (udev->removable) {
252 case USB_DEVICE_REMOVABLE:
255 case USB_DEVICE_FIXED:
262 return sprintf(buf, "%s\n", state);
264 static DEVICE_ATTR_RO(removable);
266 static ssize_t ltm_capable_show(struct device *dev,
267 struct device_attribute *attr, char *buf)
269 if (usb_device_supports_ltm(to_usb_device(dev)))
270 return sprintf(buf, "%s\n", "yes");
271 return sprintf(buf, "%s\n", "no");
273 static DEVICE_ATTR_RO(ltm_capable);
277 static ssize_t persist_show(struct device *dev, struct device_attribute *attr,
280 struct usb_device *udev = to_usb_device(dev);
282 return sprintf(buf, "%d\n", udev->persist_enabled);
285 static ssize_t persist_store(struct device *dev, struct device_attribute *attr,
286 const char *buf, size_t count)
288 struct usb_device *udev = to_usb_device(dev);
291 /* Hubs are always enabled for USB_PERSIST */
292 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
295 if (sscanf(buf, "%d", &value) != 1)
298 usb_lock_device(udev);
299 udev->persist_enabled = !!value;
300 usb_unlock_device(udev);
303 static DEVICE_ATTR_RW(persist);
305 static int add_persist_attributes(struct device *dev)
309 if (is_usb_device(dev)) {
310 struct usb_device *udev = to_usb_device(dev);
312 /* Hubs are automatically enabled for USB_PERSIST,
313 * no point in creating the attribute file.
315 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
316 rc = sysfs_add_file_to_group(&dev->kobj,
317 &dev_attr_persist.attr,
323 static void remove_persist_attributes(struct device *dev)
325 sysfs_remove_file_from_group(&dev->kobj,
326 &dev_attr_persist.attr,
331 #define add_persist_attributes(dev) 0
332 #define remove_persist_attributes(dev) do {} while (0)
334 #endif /* CONFIG_PM */
336 #ifdef CONFIG_PM_RUNTIME
338 static ssize_t connected_duration_show(struct device *dev,
339 struct device_attribute *attr, char *buf)
341 struct usb_device *udev = to_usb_device(dev);
343 return sprintf(buf, "%u\n",
344 jiffies_to_msecs(jiffies - udev->connect_time));
346 static DEVICE_ATTR_RO(connected_duration);
349 * If the device is resumed, the last time the device was suspended has
350 * been pre-subtracted from active_duration. We add the current time to
351 * get the duration that the device was actually active.
353 * If the device is suspended, the active_duration is up-to-date.
355 static ssize_t active_duration_show(struct device *dev,
356 struct device_attribute *attr, char *buf)
358 struct usb_device *udev = to_usb_device(dev);
361 if (udev->state != USB_STATE_SUSPENDED)
362 duration = jiffies_to_msecs(jiffies + udev->active_duration);
364 duration = jiffies_to_msecs(udev->active_duration);
365 return sprintf(buf, "%u\n", duration);
367 static DEVICE_ATTR_RO(active_duration);
369 static ssize_t autosuspend_show(struct device *dev,
370 struct device_attribute *attr, char *buf)
372 return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000);
375 static ssize_t autosuspend_store(struct device *dev,
376 struct device_attribute *attr, const char *buf,
381 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
382 value <= -INT_MAX/1000)
385 pm_runtime_set_autosuspend_delay(dev, value * 1000);
388 static DEVICE_ATTR_RW(autosuspend);
390 static const char on_string[] = "on";
391 static const char auto_string[] = "auto";
393 static void warn_level(void) {
394 static int level_warned;
398 printk(KERN_WARNING "WARNING! power/level is deprecated; "
399 "use power/control instead\n");
403 static ssize_t level_show(struct device *dev, struct device_attribute *attr,
406 struct usb_device *udev = to_usb_device(dev);
407 const char *p = auto_string;
410 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
412 return sprintf(buf, "%s\n", p);
415 static ssize_t level_store(struct device *dev, struct device_attribute *attr,
416 const char *buf, size_t count)
418 struct usb_device *udev = to_usb_device(dev);
424 cp = memchr(buf, '\n', count);
428 usb_lock_device(udev);
430 if (len == sizeof on_string - 1 &&
431 strncmp(buf, on_string, len) == 0)
432 usb_disable_autosuspend(udev);
434 else if (len == sizeof auto_string - 1 &&
435 strncmp(buf, auto_string, len) == 0)
436 usb_enable_autosuspend(udev);
441 usb_unlock_device(udev);
444 static DEVICE_ATTR_RW(level);
446 static ssize_t usb2_hardware_lpm_show(struct device *dev,
447 struct device_attribute *attr, char *buf)
449 struct usb_device *udev = to_usb_device(dev);
452 if (udev->usb2_hw_lpm_enabled == 1)
457 return sprintf(buf, "%s\n", p);
460 static ssize_t usb2_hardware_lpm_store(struct device *dev,
461 struct device_attribute *attr,
462 const char *buf, size_t count)
464 struct usb_device *udev = to_usb_device(dev);
468 usb_lock_device(udev);
470 ret = strtobool(buf, &value);
473 ret = usb_set_usb2_hardware_lpm(udev, value);
475 usb_unlock_device(udev);
482 static DEVICE_ATTR_RW(usb2_hardware_lpm);
484 static ssize_t usb2_lpm_l1_timeout_show(struct device *dev,
485 struct device_attribute *attr,
488 struct usb_device *udev = to_usb_device(dev);
489 return sprintf(buf, "%d\n", udev->l1_params.timeout);
492 static ssize_t usb2_lpm_l1_timeout_store(struct device *dev,
493 struct device_attribute *attr,
494 const char *buf, size_t count)
496 struct usb_device *udev = to_usb_device(dev);
499 if (kstrtou16(buf, 0, &timeout))
502 udev->l1_params.timeout = timeout;
506 static DEVICE_ATTR_RW(usb2_lpm_l1_timeout);
508 static ssize_t usb2_lpm_besl_show(struct device *dev,
509 struct device_attribute *attr, char *buf)
511 struct usb_device *udev = to_usb_device(dev);
512 return sprintf(buf, "%d\n", udev->l1_params.besl);
515 static ssize_t usb2_lpm_besl_store(struct device *dev,
516 struct device_attribute *attr,
517 const char *buf, size_t count)
519 struct usb_device *udev = to_usb_device(dev);
522 if (kstrtou8(buf, 0, &besl) || besl > 15)
525 udev->l1_params.besl = besl;
529 static DEVICE_ATTR_RW(usb2_lpm_besl);
531 static struct attribute *usb2_hardware_lpm_attr[] = {
532 &dev_attr_usb2_hardware_lpm.attr,
533 &dev_attr_usb2_lpm_l1_timeout.attr,
534 &dev_attr_usb2_lpm_besl.attr,
537 static struct attribute_group usb2_hardware_lpm_attr_group = {
538 .name = power_group_name,
539 .attrs = usb2_hardware_lpm_attr,
542 static struct attribute *power_attrs[] = {
543 &dev_attr_autosuspend.attr,
544 &dev_attr_level.attr,
545 &dev_attr_connected_duration.attr,
546 &dev_attr_active_duration.attr,
549 static struct attribute_group power_attr_group = {
550 .name = power_group_name,
551 .attrs = power_attrs,
554 static int add_power_attributes(struct device *dev)
558 if (is_usb_device(dev)) {
559 struct usb_device *udev = to_usb_device(dev);
560 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
561 if (udev->usb2_hw_lpm_capable == 1)
562 rc = sysfs_merge_group(&dev->kobj,
563 &usb2_hardware_lpm_attr_group);
569 static void remove_power_attributes(struct device *dev)
571 sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
572 sysfs_unmerge_group(&dev->kobj, &power_attr_group);
577 #define add_power_attributes(dev) 0
578 #define remove_power_attributes(dev) do {} while (0)
580 #endif /* CONFIG_PM_RUNTIME */
583 /* Descriptor fields */
584 #define usb_descriptor_attr_le16(field, format_string) \
586 field##_show(struct device *dev, struct device_attribute *attr, \
589 struct usb_device *udev; \
591 udev = to_usb_device(dev); \
592 return sprintf(buf, format_string, \
593 le16_to_cpu(udev->descriptor.field)); \
595 static DEVICE_ATTR_RO(field)
597 usb_descriptor_attr_le16(idVendor, "%04x\n");
598 usb_descriptor_attr_le16(idProduct, "%04x\n");
599 usb_descriptor_attr_le16(bcdDevice, "%04x\n");
601 #define usb_descriptor_attr(field, format_string) \
603 field##_show(struct device *dev, struct device_attribute *attr, \
606 struct usb_device *udev; \
608 udev = to_usb_device(dev); \
609 return sprintf(buf, format_string, udev->descriptor.field); \
611 static DEVICE_ATTR_RO(field)
613 usb_descriptor_attr(bDeviceClass, "%02x\n");
614 usb_descriptor_attr(bDeviceSubClass, "%02x\n");
615 usb_descriptor_attr(bDeviceProtocol, "%02x\n");
616 usb_descriptor_attr(bNumConfigurations, "%d\n");
617 usb_descriptor_attr(bMaxPacketSize0, "%d\n");
620 /* show if the device is authorized (1) or not (0) */
621 static ssize_t authorized_show(struct device *dev,
622 struct device_attribute *attr, char *buf)
624 struct usb_device *usb_dev = to_usb_device(dev);
625 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
629 * Authorize a device to be used in the system
631 * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
633 static ssize_t authorized_store(struct device *dev,
634 struct device_attribute *attr, const char *buf,
638 struct usb_device *usb_dev = to_usb_device(dev);
640 result = sscanf(buf, "%u\n", &val);
644 result = usb_deauthorize_device(usb_dev);
646 result = usb_authorize_device(usb_dev);
647 return result < 0? result : size;
649 static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, S_IRUGO | S_IWUSR,
650 authorized_show, authorized_store);
652 /* "Safely remove a device" */
653 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
654 const char *buf, size_t count)
656 struct usb_device *udev = to_usb_device(dev);
659 usb_lock_device(udev);
660 if (udev->state != USB_STATE_NOTATTACHED) {
662 /* To avoid races, first unconfigure and then remove */
663 usb_set_configuration(udev, -1);
664 rc = usb_remove_device(udev);
668 usb_unlock_device(udev);
671 static DEVICE_ATTR_IGNORE_LOCKDEP(remove, S_IWUSR, NULL, remove_store);
674 static struct attribute *dev_attrs[] = {
675 /* current configuration's attributes */
676 &dev_attr_configuration.attr,
677 &dev_attr_bNumInterfaces.attr,
678 &dev_attr_bConfigurationValue.attr,
679 &dev_attr_bmAttributes.attr,
680 &dev_attr_bMaxPower.attr,
681 /* device attributes */
682 &dev_attr_urbnum.attr,
683 &dev_attr_idVendor.attr,
684 &dev_attr_idProduct.attr,
685 &dev_attr_bcdDevice.attr,
686 &dev_attr_bDeviceClass.attr,
687 &dev_attr_bDeviceSubClass.attr,
688 &dev_attr_bDeviceProtocol.attr,
689 &dev_attr_bNumConfigurations.attr,
690 &dev_attr_bMaxPacketSize0.attr,
691 &dev_attr_speed.attr,
692 &dev_attr_busnum.attr,
693 &dev_attr_devnum.attr,
694 &dev_attr_devpath.attr,
695 &dev_attr_version.attr,
696 &dev_attr_maxchild.attr,
697 &dev_attr_quirks.attr,
698 &dev_attr_avoid_reset_quirk.attr,
699 &dev_attr_authorized.attr,
700 &dev_attr_remove.attr,
701 &dev_attr_removable.attr,
702 &dev_attr_ltm_capable.attr,
705 static struct attribute_group dev_attr_grp = {
709 /* When modifying this list, be sure to modify dev_string_attrs_are_visible()
712 static struct attribute *dev_string_attrs[] = {
713 &dev_attr_manufacturer.attr,
714 &dev_attr_product.attr,
715 &dev_attr_serial.attr,
719 static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
720 struct attribute *a, int n)
722 struct device *dev = container_of(kobj, struct device, kobj);
723 struct usb_device *udev = to_usb_device(dev);
725 if (a == &dev_attr_manufacturer.attr) {
726 if (udev->manufacturer == NULL)
728 } else if (a == &dev_attr_product.attr) {
729 if (udev->product == NULL)
731 } else if (a == &dev_attr_serial.attr) {
732 if (udev->serial == NULL)
738 static struct attribute_group dev_string_attr_grp = {
739 .attrs = dev_string_attrs,
740 .is_visible = dev_string_attrs_are_visible,
743 const struct attribute_group *usb_device_groups[] = {
745 &dev_string_attr_grp,
749 /* Binary descriptors */
752 read_descriptors(struct file *filp, struct kobject *kobj,
753 struct bin_attribute *attr,
754 char *buf, loff_t off, size_t count)
756 struct device *dev = container_of(kobj, struct device, kobj);
757 struct usb_device *udev = to_usb_device(dev);
758 size_t nleft = count;
763 /* The binary attribute begins with the device descriptor.
764 * Following that are the raw descriptor entries for all the
765 * configurations (config plus subsidiary descriptors).
767 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
768 nleft > 0; ++cfgno) {
770 src = &udev->descriptor;
771 srclen = sizeof(struct usb_device_descriptor);
773 src = udev->rawdescriptors[cfgno];
774 srclen = __le16_to_cpu(udev->config[cfgno].desc.
778 n = min(nleft, srclen - (size_t) off);
779 memcpy(buf, src + off, n);
787 return count - nleft;
790 static struct bin_attribute dev_bin_attr_descriptors = {
791 .attr = {.name = "descriptors", .mode = 0444},
792 .read = read_descriptors,
793 .size = 18 + 65535, /* dev descr + max-size raw descriptor */
796 int usb_create_sysfs_dev_files(struct usb_device *udev)
798 struct device *dev = &udev->dev;
801 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
805 retval = add_persist_attributes(dev);
809 retval = add_power_attributes(dev);
814 usb_remove_sysfs_dev_files(udev);
818 void usb_remove_sysfs_dev_files(struct usb_device *udev)
820 struct device *dev = &udev->dev;
822 remove_power_attributes(dev);
823 remove_persist_attributes(dev);
824 device_remove_bin_file(dev, &dev_bin_attr_descriptors);
827 /* Interface Accociation Descriptor fields */
828 #define usb_intf_assoc_attr(field, format_string) \
830 iad_##field##_show(struct device *dev, struct device_attribute *attr, \
833 struct usb_interface *intf = to_usb_interface(dev); \
835 return sprintf(buf, format_string, \
836 intf->intf_assoc->field); \
838 static DEVICE_ATTR_RO(iad_##field)
840 usb_intf_assoc_attr(bFirstInterface, "%02x\n");
841 usb_intf_assoc_attr(bInterfaceCount, "%02d\n");
842 usb_intf_assoc_attr(bFunctionClass, "%02x\n");
843 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n");
844 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n");
846 /* Interface fields */
847 #define usb_intf_attr(field, format_string) \
849 field##_show(struct device *dev, struct device_attribute *attr, \
852 struct usb_interface *intf = to_usb_interface(dev); \
854 return sprintf(buf, format_string, \
855 intf->cur_altsetting->desc.field); \
857 static DEVICE_ATTR_RO(field)
859 usb_intf_attr(bInterfaceNumber, "%02x\n");
860 usb_intf_attr(bAlternateSetting, "%2d\n");
861 usb_intf_attr(bNumEndpoints, "%02x\n");
862 usb_intf_attr(bInterfaceClass, "%02x\n");
863 usb_intf_attr(bInterfaceSubClass, "%02x\n");
864 usb_intf_attr(bInterfaceProtocol, "%02x\n");
866 static ssize_t interface_show(struct device *dev, struct device_attribute *attr,
869 struct usb_interface *intf;
872 intf = to_usb_interface(dev);
873 string = intf->cur_altsetting->string;
874 barrier(); /* The altsetting might change! */
878 return sprintf(buf, "%s\n", string);
880 static DEVICE_ATTR_RO(interface);
882 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
885 struct usb_interface *intf;
886 struct usb_device *udev;
887 struct usb_host_interface *alt;
889 intf = to_usb_interface(dev);
890 udev = interface_to_usbdev(intf);
891 alt = intf->cur_altsetting;
893 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
894 "ic%02Xisc%02Xip%02Xin%02X\n",
895 le16_to_cpu(udev->descriptor.idVendor),
896 le16_to_cpu(udev->descriptor.idProduct),
897 le16_to_cpu(udev->descriptor.bcdDevice),
898 udev->descriptor.bDeviceClass,
899 udev->descriptor.bDeviceSubClass,
900 udev->descriptor.bDeviceProtocol,
901 alt->desc.bInterfaceClass,
902 alt->desc.bInterfaceSubClass,
903 alt->desc.bInterfaceProtocol,
904 alt->desc.bInterfaceNumber);
906 static DEVICE_ATTR_RO(modalias);
908 static ssize_t supports_autosuspend_show(struct device *dev,
909 struct device_attribute *attr,
912 struct usb_interface *intf;
913 struct usb_device *udev;
916 intf = to_usb_interface(dev);
917 udev = interface_to_usbdev(intf);
919 usb_lock_device(udev);
920 /* Devices will be autosuspended even when an interface isn't claimed */
921 if (!intf->dev.driver ||
922 to_usb_driver(intf->dev.driver)->supports_autosuspend)
923 ret = sprintf(buf, "%u\n", 1);
925 ret = sprintf(buf, "%u\n", 0);
926 usb_unlock_device(udev);
930 static DEVICE_ATTR_RO(supports_autosuspend);
932 static struct attribute *intf_attrs[] = {
933 &dev_attr_bInterfaceNumber.attr,
934 &dev_attr_bAlternateSetting.attr,
935 &dev_attr_bNumEndpoints.attr,
936 &dev_attr_bInterfaceClass.attr,
937 &dev_attr_bInterfaceSubClass.attr,
938 &dev_attr_bInterfaceProtocol.attr,
939 &dev_attr_modalias.attr,
940 &dev_attr_supports_autosuspend.attr,
943 static struct attribute_group intf_attr_grp = {
947 static struct attribute *intf_assoc_attrs[] = {
948 &dev_attr_iad_bFirstInterface.attr,
949 &dev_attr_iad_bInterfaceCount.attr,
950 &dev_attr_iad_bFunctionClass.attr,
951 &dev_attr_iad_bFunctionSubClass.attr,
952 &dev_attr_iad_bFunctionProtocol.attr,
956 static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
957 struct attribute *a, int n)
959 struct device *dev = container_of(kobj, struct device, kobj);
960 struct usb_interface *intf = to_usb_interface(dev);
962 if (intf->intf_assoc == NULL)
967 static struct attribute_group intf_assoc_attr_grp = {
968 .attrs = intf_assoc_attrs,
969 .is_visible = intf_assoc_attrs_are_visible,
972 const struct attribute_group *usb_interface_groups[] = {
974 &intf_assoc_attr_grp,
978 void usb_create_sysfs_intf_files(struct usb_interface *intf)
980 struct usb_device *udev = interface_to_usbdev(intf);
981 struct usb_host_interface *alt = intf->cur_altsetting;
983 if (intf->sysfs_files_created || intf->unregistering)
986 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
987 alt->string = usb_cache_string(udev, alt->desc.iInterface);
988 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface))
989 ; /* We don't actually care if the function fails. */
990 intf->sysfs_files_created = 1;
993 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
995 if (!intf->sysfs_files_created)
998 device_remove_file(&intf->dev, &dev_attr_interface);
999 intf->sysfs_files_created = 0;