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 show_##field(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(field, S_IRUGO, show_##field, NULL);
40 usb_actconfig_attr(bNumInterfaces, "%2d\n")
41 usb_actconfig_attr(bmAttributes, "%2x\n")
43 static ssize_t show_bMaxPower(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(bMaxPower, S_IRUGO, show_bMaxPower, NULL);
57 static ssize_t show_configuration_string(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(configuration, S_IRUGO, show_configuration_string, NULL);
71 /* configuration value is always present, and r/w */
72 usb_actconfig_show(bConfigurationValue, "%u\n");
75 set_bConfigurationValue(struct device *dev, 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;
89 static DEVICE_ATTR_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,
90 show_bConfigurationValue, set_bConfigurationValue);
93 #define usb_string_attr(name) \
94 static ssize_t show_##name(struct device *dev, \
95 struct device_attribute *attr, char *buf) \
97 struct usb_device *udev; \
100 udev = to_usb_device(dev); \
101 usb_lock_device(udev); \
102 retval = sprintf(buf, "%s\n", udev->name); \
103 usb_unlock_device(udev); \
106 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
108 usb_string_attr(product);
109 usb_string_attr(manufacturer);
110 usb_string_attr(serial);
113 show_speed(struct device *dev, struct device_attribute *attr, char *buf)
115 struct usb_device *udev;
118 udev = to_usb_device(dev);
120 switch (udev->speed) {
124 case USB_SPEED_UNKNOWN:
131 case USB_SPEED_WIRELESS:
134 case USB_SPEED_SUPER:
140 return sprintf(buf, "%s\n", speed);
142 static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL);
145 show_busnum(struct device *dev, struct device_attribute *attr, char *buf)
147 struct usb_device *udev;
149 udev = to_usb_device(dev);
150 return sprintf(buf, "%d\n", udev->bus->busnum);
152 static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL);
155 show_devnum(struct device *dev, struct device_attribute *attr, char *buf)
157 struct usb_device *udev;
159 udev = to_usb_device(dev);
160 return sprintf(buf, "%d\n", udev->devnum);
162 static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL);
165 show_devpath(struct device *dev, struct device_attribute *attr, char *buf)
167 struct usb_device *udev;
169 udev = to_usb_device(dev);
170 return sprintf(buf, "%s\n", udev->devpath);
172 static DEVICE_ATTR(devpath, S_IRUGO, show_devpath, NULL);
175 show_version(struct device *dev, struct device_attribute *attr, char *buf)
177 struct usb_device *udev;
180 udev = to_usb_device(dev);
181 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
182 return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
184 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
187 show_maxchild(struct device *dev, struct device_attribute *attr, char *buf)
189 struct usb_device *udev;
191 udev = to_usb_device(dev);
192 return sprintf(buf, "%d\n", udev->maxchild);
194 static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL);
197 show_quirks(struct device *dev, struct device_attribute *attr, char *buf)
199 struct usb_device *udev;
201 udev = to_usb_device(dev);
202 return sprintf(buf, "0x%x\n", udev->quirks);
204 static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);
207 show_avoid_reset_quirk(struct device *dev, struct device_attribute *attr, char *buf)
209 struct usb_device *udev;
211 udev = to_usb_device(dev);
212 return sprintf(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET));
216 set_avoid_reset_quirk(struct device *dev, struct device_attribute *attr,
217 const char *buf, size_t count)
219 struct usb_device *udev = to_usb_device(dev);
222 if (sscanf(buf, "%d", &val) != 1 || val < 0 || val > 1)
224 usb_lock_device(udev);
226 udev->quirks |= USB_QUIRK_RESET;
228 udev->quirks &= ~USB_QUIRK_RESET;
229 usb_unlock_device(udev);
233 static DEVICE_ATTR(avoid_reset_quirk, S_IRUGO | S_IWUSR,
234 show_avoid_reset_quirk, set_avoid_reset_quirk);
237 show_urbnum(struct device *dev, struct device_attribute *attr, char *buf)
239 struct usb_device *udev;
241 udev = to_usb_device(dev);
242 return sprintf(buf, "%d\n", atomic_read(&udev->urbnum));
244 static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL);
247 show_removable(struct device *dev, struct device_attribute *attr, char *buf)
249 struct usb_device *udev;
252 udev = to_usb_device(dev);
254 switch (udev->removable) {
255 case USB_DEVICE_REMOVABLE:
258 case USB_DEVICE_FIXED:
265 return sprintf(buf, "%s\n", state);
267 static DEVICE_ATTR(removable, S_IRUGO, show_removable, NULL);
270 show_ltm_capable(struct device *dev, struct device_attribute *attr, char *buf)
272 if (usb_device_supports_ltm(to_usb_device(dev)))
273 return sprintf(buf, "%s\n", "yes");
274 return sprintf(buf, "%s\n", "no");
276 static DEVICE_ATTR(ltm_capable, S_IRUGO, show_ltm_capable, NULL);
281 show_persist(struct device *dev, struct device_attribute *attr, char *buf)
283 struct usb_device *udev = to_usb_device(dev);
285 return sprintf(buf, "%d\n", udev->persist_enabled);
289 set_persist(struct device *dev, struct device_attribute *attr,
290 const char *buf, size_t count)
292 struct usb_device *udev = to_usb_device(dev);
295 /* Hubs are always enabled for USB_PERSIST */
296 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
299 if (sscanf(buf, "%d", &value) != 1)
302 usb_lock_device(udev);
303 udev->persist_enabled = !!value;
304 usb_unlock_device(udev);
308 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
310 static int add_persist_attributes(struct device *dev)
314 if (is_usb_device(dev)) {
315 struct usb_device *udev = to_usb_device(dev);
317 /* Hubs are automatically enabled for USB_PERSIST,
318 * no point in creating the attribute file.
320 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
321 rc = sysfs_add_file_to_group(&dev->kobj,
322 &dev_attr_persist.attr,
328 static void remove_persist_attributes(struct device *dev)
330 sysfs_remove_file_from_group(&dev->kobj,
331 &dev_attr_persist.attr,
336 #define add_persist_attributes(dev) 0
337 #define remove_persist_attributes(dev) do {} while (0)
339 #endif /* CONFIG_PM */
341 #ifdef CONFIG_PM_RUNTIME
344 show_connected_duration(struct device *dev, struct device_attribute *attr,
347 struct usb_device *udev = to_usb_device(dev);
349 return sprintf(buf, "%u\n",
350 jiffies_to_msecs(jiffies - udev->connect_time));
353 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
356 * If the device is resumed, the last time the device was suspended has
357 * been pre-subtracted from active_duration. We add the current time to
358 * get the duration that the device was actually active.
360 * If the device is suspended, the active_duration is up-to-date.
363 show_active_duration(struct device *dev, struct device_attribute *attr,
366 struct usb_device *udev = to_usb_device(dev);
369 if (udev->state != USB_STATE_SUSPENDED)
370 duration = jiffies_to_msecs(jiffies + udev->active_duration);
372 duration = jiffies_to_msecs(udev->active_duration);
373 return sprintf(buf, "%u\n", duration);
376 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
379 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
381 return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000);
385 set_autosuspend(struct device *dev, struct device_attribute *attr,
386 const char *buf, size_t count)
390 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
391 value <= -INT_MAX/1000)
394 pm_runtime_set_autosuspend_delay(dev, value * 1000);
398 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
399 show_autosuspend, set_autosuspend);
401 static const char on_string[] = "on";
402 static const char auto_string[] = "auto";
404 static void warn_level(void) {
405 static int level_warned;
409 printk(KERN_WARNING "WARNING! power/level is deprecated; "
410 "use power/control instead\n");
415 show_level(struct device *dev, struct device_attribute *attr, char *buf)
417 struct usb_device *udev = to_usb_device(dev);
418 const char *p = auto_string;
421 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
423 return sprintf(buf, "%s\n", p);
427 set_level(struct device *dev, struct device_attribute *attr,
428 const char *buf, size_t count)
430 struct usb_device *udev = to_usb_device(dev);
436 cp = memchr(buf, '\n', count);
440 usb_lock_device(udev);
442 if (len == sizeof on_string - 1 &&
443 strncmp(buf, on_string, len) == 0)
444 usb_disable_autosuspend(udev);
446 else if (len == sizeof auto_string - 1 &&
447 strncmp(buf, auto_string, len) == 0)
448 usb_enable_autosuspend(udev);
453 usb_unlock_device(udev);
457 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
460 show_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr,
463 struct usb_device *udev = to_usb_device(dev);
466 if (udev->usb2_hw_lpm_enabled == 1)
471 return sprintf(buf, "%s\n", p);
475 set_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr,
476 const char *buf, size_t count)
478 struct usb_device *udev = to_usb_device(dev);
482 usb_lock_device(udev);
484 ret = strtobool(buf, &value);
487 ret = usb_set_usb2_hardware_lpm(udev, value);
489 usb_unlock_device(udev);
497 static DEVICE_ATTR(usb2_hardware_lpm, S_IRUGO | S_IWUSR, show_usb2_hardware_lpm,
498 set_usb2_hardware_lpm);
501 show_usb2_lpm_l1_timeout(struct device *dev, struct device_attribute *attr,
504 struct usb_device *udev = to_usb_device(dev);
505 return sprintf(buf, "%d\n", udev->l1_params.timeout);
509 set_usb2_lpm_l1_timeout(struct device *dev, struct device_attribute *attr,
510 const char *buf, size_t count)
512 struct usb_device *udev = to_usb_device(dev);
515 if (kstrtou16(buf, 0, &timeout))
518 udev->l1_params.timeout = timeout;
523 static DEVICE_ATTR(usb2_lpm_l1_timeout, S_IRUGO | S_IWUSR,
524 show_usb2_lpm_l1_timeout, set_usb2_lpm_l1_timeout);
527 show_usb2_lpm_besl(struct device *dev, struct device_attribute *attr,
530 struct usb_device *udev = to_usb_device(dev);
531 return sprintf(buf, "%d\n", udev->l1_params.besl);
535 set_usb2_lpm_besl(struct device *dev, struct device_attribute *attr,
536 const char *buf, size_t count)
538 struct usb_device *udev = to_usb_device(dev);
541 if (kstrtou8(buf, 0, &besl) || besl > 15)
544 udev->l1_params.besl = besl;
549 static DEVICE_ATTR(usb2_lpm_besl, S_IRUGO | S_IWUSR,
550 show_usb2_lpm_besl, set_usb2_lpm_besl);
552 static struct attribute *usb2_hardware_lpm_attr[] = {
553 &dev_attr_usb2_hardware_lpm.attr,
554 &dev_attr_usb2_lpm_l1_timeout.attr,
555 &dev_attr_usb2_lpm_besl.attr,
558 static struct attribute_group usb2_hardware_lpm_attr_group = {
559 .name = power_group_name,
560 .attrs = usb2_hardware_lpm_attr,
563 static struct attribute *power_attrs[] = {
564 &dev_attr_autosuspend.attr,
565 &dev_attr_level.attr,
566 &dev_attr_connected_duration.attr,
567 &dev_attr_active_duration.attr,
570 static struct attribute_group power_attr_group = {
571 .name = power_group_name,
572 .attrs = power_attrs,
575 static int add_power_attributes(struct device *dev)
579 if (is_usb_device(dev)) {
580 struct usb_device *udev = to_usb_device(dev);
581 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
582 if (udev->usb2_hw_lpm_capable == 1)
583 rc = sysfs_merge_group(&dev->kobj,
584 &usb2_hardware_lpm_attr_group);
590 static void remove_power_attributes(struct device *dev)
592 sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
593 sysfs_unmerge_group(&dev->kobj, &power_attr_group);
598 #define add_power_attributes(dev) 0
599 #define remove_power_attributes(dev) do {} while (0)
601 #endif /* CONFIG_PM_RUNTIME */
604 /* Descriptor fields */
605 #define usb_descriptor_attr_le16(field, format_string) \
607 show_##field(struct device *dev, struct device_attribute *attr, \
610 struct usb_device *udev; \
612 udev = to_usb_device(dev); \
613 return sprintf(buf, format_string, \
614 le16_to_cpu(udev->descriptor.field)); \
616 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
618 usb_descriptor_attr_le16(idVendor, "%04x\n")
619 usb_descriptor_attr_le16(idProduct, "%04x\n")
620 usb_descriptor_attr_le16(bcdDevice, "%04x\n")
622 #define usb_descriptor_attr(field, format_string) \
624 show_##field(struct device *dev, struct device_attribute *attr, \
627 struct usb_device *udev; \
629 udev = to_usb_device(dev); \
630 return sprintf(buf, format_string, udev->descriptor.field); \
632 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
634 usb_descriptor_attr(bDeviceClass, "%02x\n")
635 usb_descriptor_attr(bDeviceSubClass, "%02x\n")
636 usb_descriptor_attr(bDeviceProtocol, "%02x\n")
637 usb_descriptor_attr(bNumConfigurations, "%d\n")
638 usb_descriptor_attr(bMaxPacketSize0, "%d\n")
642 /* show if the device is authorized (1) or not (0) */
643 static ssize_t usb_dev_authorized_show(struct device *dev,
644 struct device_attribute *attr,
647 struct usb_device *usb_dev = to_usb_device(dev);
648 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
653 * Authorize a device to be used in the system
655 * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
657 static ssize_t usb_dev_authorized_store(struct device *dev,
658 struct device_attribute *attr,
659 const char *buf, size_t size)
662 struct usb_device *usb_dev = to_usb_device(dev);
664 result = sscanf(buf, "%u\n", &val);
668 result = usb_deauthorize_device(usb_dev);
670 result = usb_authorize_device(usb_dev);
671 return result < 0? result : size;
674 static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, 0644,
675 usb_dev_authorized_show, usb_dev_authorized_store);
677 /* "Safely remove a device" */
678 static ssize_t usb_remove_store(struct device *dev,
679 struct device_attribute *attr,
680 const char *buf, size_t count)
682 struct usb_device *udev = to_usb_device(dev);
685 usb_lock_device(udev);
686 if (udev->state != USB_STATE_NOTATTACHED) {
688 /* To avoid races, first unconfigure and then remove */
689 usb_set_configuration(udev, -1);
690 rc = usb_remove_device(udev);
694 usb_unlock_device(udev);
697 static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0200, NULL, usb_remove_store);
700 static struct attribute *dev_attrs[] = {
701 /* current configuration's attributes */
702 &dev_attr_configuration.attr,
703 &dev_attr_bNumInterfaces.attr,
704 &dev_attr_bConfigurationValue.attr,
705 &dev_attr_bmAttributes.attr,
706 &dev_attr_bMaxPower.attr,
707 /* device attributes */
708 &dev_attr_urbnum.attr,
709 &dev_attr_idVendor.attr,
710 &dev_attr_idProduct.attr,
711 &dev_attr_bcdDevice.attr,
712 &dev_attr_bDeviceClass.attr,
713 &dev_attr_bDeviceSubClass.attr,
714 &dev_attr_bDeviceProtocol.attr,
715 &dev_attr_bNumConfigurations.attr,
716 &dev_attr_bMaxPacketSize0.attr,
717 &dev_attr_speed.attr,
718 &dev_attr_busnum.attr,
719 &dev_attr_devnum.attr,
720 &dev_attr_devpath.attr,
721 &dev_attr_version.attr,
722 &dev_attr_maxchild.attr,
723 &dev_attr_quirks.attr,
724 &dev_attr_avoid_reset_quirk.attr,
725 &dev_attr_authorized.attr,
726 &dev_attr_remove.attr,
727 &dev_attr_removable.attr,
728 &dev_attr_ltm_capable.attr,
731 static struct attribute_group dev_attr_grp = {
735 /* When modifying this list, be sure to modify dev_string_attrs_are_visible()
738 static struct attribute *dev_string_attrs[] = {
739 &dev_attr_manufacturer.attr,
740 &dev_attr_product.attr,
741 &dev_attr_serial.attr,
745 static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
746 struct attribute *a, int n)
748 struct device *dev = container_of(kobj, struct device, kobj);
749 struct usb_device *udev = to_usb_device(dev);
751 if (a == &dev_attr_manufacturer.attr) {
752 if (udev->manufacturer == NULL)
754 } else if (a == &dev_attr_product.attr) {
755 if (udev->product == NULL)
757 } else if (a == &dev_attr_serial.attr) {
758 if (udev->serial == NULL)
764 static struct attribute_group dev_string_attr_grp = {
765 .attrs = dev_string_attrs,
766 .is_visible = dev_string_attrs_are_visible,
769 const struct attribute_group *usb_device_groups[] = {
771 &dev_string_attr_grp,
775 /* Binary descriptors */
778 read_descriptors(struct file *filp, struct kobject *kobj,
779 struct bin_attribute *attr,
780 char *buf, loff_t off, size_t count)
782 struct device *dev = container_of(kobj, struct device, kobj);
783 struct usb_device *udev = to_usb_device(dev);
784 size_t nleft = count;
789 /* The binary attribute begins with the device descriptor.
790 * Following that are the raw descriptor entries for all the
791 * configurations (config plus subsidiary descriptors).
793 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
794 nleft > 0; ++cfgno) {
796 src = &udev->descriptor;
797 srclen = sizeof(struct usb_device_descriptor);
799 src = udev->rawdescriptors[cfgno];
800 srclen = __le16_to_cpu(udev->config[cfgno].desc.
804 n = min(nleft, srclen - (size_t) off);
805 memcpy(buf, src + off, n);
813 return count - nleft;
816 static struct bin_attribute dev_bin_attr_descriptors = {
817 .attr = {.name = "descriptors", .mode = 0444},
818 .read = read_descriptors,
819 .size = 18 + 65535, /* dev descr + max-size raw descriptor */
822 int usb_create_sysfs_dev_files(struct usb_device *udev)
824 struct device *dev = &udev->dev;
827 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
831 retval = add_persist_attributes(dev);
835 retval = add_power_attributes(dev);
840 usb_remove_sysfs_dev_files(udev);
844 void usb_remove_sysfs_dev_files(struct usb_device *udev)
846 struct device *dev = &udev->dev;
848 remove_power_attributes(dev);
849 remove_persist_attributes(dev);
850 device_remove_bin_file(dev, &dev_bin_attr_descriptors);
853 /* Interface Accociation Descriptor fields */
854 #define usb_intf_assoc_attr(field, format_string) \
856 show_iad_##field(struct device *dev, struct device_attribute *attr, \
859 struct usb_interface *intf = to_usb_interface(dev); \
861 return sprintf(buf, format_string, \
862 intf->intf_assoc->field); \
864 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
866 usb_intf_assoc_attr(bFirstInterface, "%02x\n")
867 usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
868 usb_intf_assoc_attr(bFunctionClass, "%02x\n")
869 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
870 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
872 /* Interface fields */
873 #define usb_intf_attr(field, format_string) \
875 show_##field(struct device *dev, struct device_attribute *attr, \
878 struct usb_interface *intf = to_usb_interface(dev); \
880 return sprintf(buf, format_string, \
881 intf->cur_altsetting->desc.field); \
883 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
885 usb_intf_attr(bInterfaceNumber, "%02x\n")
886 usb_intf_attr(bAlternateSetting, "%2d\n")
887 usb_intf_attr(bNumEndpoints, "%02x\n")
888 usb_intf_attr(bInterfaceClass, "%02x\n")
889 usb_intf_attr(bInterfaceSubClass, "%02x\n")
890 usb_intf_attr(bInterfaceProtocol, "%02x\n")
892 static ssize_t show_interface_string(struct device *dev,
893 struct device_attribute *attr, char *buf)
895 struct usb_interface *intf;
898 intf = to_usb_interface(dev);
899 string = intf->cur_altsetting->string;
900 barrier(); /* The altsetting might change! */
904 return sprintf(buf, "%s\n", string);
906 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
908 static ssize_t show_modalias(struct device *dev,
909 struct device_attribute *attr, char *buf)
911 struct usb_interface *intf;
912 struct usb_device *udev;
913 struct usb_host_interface *alt;
915 intf = to_usb_interface(dev);
916 udev = interface_to_usbdev(intf);
917 alt = intf->cur_altsetting;
919 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
920 "ic%02Xisc%02Xip%02Xin%02X\n",
921 le16_to_cpu(udev->descriptor.idVendor),
922 le16_to_cpu(udev->descriptor.idProduct),
923 le16_to_cpu(udev->descriptor.bcdDevice),
924 udev->descriptor.bDeviceClass,
925 udev->descriptor.bDeviceSubClass,
926 udev->descriptor.bDeviceProtocol,
927 alt->desc.bInterfaceClass,
928 alt->desc.bInterfaceSubClass,
929 alt->desc.bInterfaceProtocol,
930 alt->desc.bInterfaceNumber);
932 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
934 static ssize_t show_supports_autosuspend(struct device *dev,
935 struct device_attribute *attr, char *buf)
937 struct usb_interface *intf;
938 struct usb_device *udev;
941 intf = to_usb_interface(dev);
942 udev = interface_to_usbdev(intf);
944 usb_lock_device(udev);
945 /* Devices will be autosuspended even when an interface isn't claimed */
946 if (!intf->dev.driver ||
947 to_usb_driver(intf->dev.driver)->supports_autosuspend)
948 ret = sprintf(buf, "%u\n", 1);
950 ret = sprintf(buf, "%u\n", 0);
951 usb_unlock_device(udev);
955 static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
957 static struct attribute *intf_attrs[] = {
958 &dev_attr_bInterfaceNumber.attr,
959 &dev_attr_bAlternateSetting.attr,
960 &dev_attr_bNumEndpoints.attr,
961 &dev_attr_bInterfaceClass.attr,
962 &dev_attr_bInterfaceSubClass.attr,
963 &dev_attr_bInterfaceProtocol.attr,
964 &dev_attr_modalias.attr,
965 &dev_attr_supports_autosuspend.attr,
968 static struct attribute_group intf_attr_grp = {
972 static struct attribute *intf_assoc_attrs[] = {
973 &dev_attr_iad_bFirstInterface.attr,
974 &dev_attr_iad_bInterfaceCount.attr,
975 &dev_attr_iad_bFunctionClass.attr,
976 &dev_attr_iad_bFunctionSubClass.attr,
977 &dev_attr_iad_bFunctionProtocol.attr,
981 static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
982 struct attribute *a, int n)
984 struct device *dev = container_of(kobj, struct device, kobj);
985 struct usb_interface *intf = to_usb_interface(dev);
987 if (intf->intf_assoc == NULL)
992 static struct attribute_group intf_assoc_attr_grp = {
993 .attrs = intf_assoc_attrs,
994 .is_visible = intf_assoc_attrs_are_visible,
997 const struct attribute_group *usb_interface_groups[] = {
999 &intf_assoc_attr_grp,
1003 void usb_create_sysfs_intf_files(struct usb_interface *intf)
1005 struct usb_device *udev = interface_to_usbdev(intf);
1006 struct usb_host_interface *alt = intf->cur_altsetting;
1008 if (intf->sysfs_files_created || intf->unregistering)
1011 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
1012 alt->string = usb_cache_string(udev, alt->desc.iInterface);
1013 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface))
1014 ; /* We don't actually care if the function fails. */
1015 intf->sysfs_files_created = 1;
1018 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
1020 if (!intf->sysfs_files_created)
1023 device_remove_file(&intf->dev, &dev_attr_interface);
1024 intf->sysfs_files_created = 0;