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; \
28 udev = to_usb_device(dev); \
29 rc = usb_lock_device_interruptible(udev); \
32 actconfig = udev->actconfig; \
34 rc = sprintf(buf, format_string, \
35 actconfig->desc.field); \
36 usb_unlock_device(udev); \
40 #define usb_actconfig_attr(field, format_string) \
41 usb_actconfig_show(field, format_string) \
42 static DEVICE_ATTR_RO(field)
44 usb_actconfig_attr(bNumInterfaces, "%2d\n");
45 usb_actconfig_attr(bmAttributes, "%2x\n");
47 static ssize_t bMaxPower_show(struct device *dev,
48 struct device_attribute *attr, char *buf)
50 struct usb_device *udev;
51 struct usb_host_config *actconfig;
54 udev = to_usb_device(dev);
55 rc = usb_lock_device_interruptible(udev);
58 actconfig = udev->actconfig;
60 rc = sprintf(buf, "%dmA\n", usb_get_max_power(udev, actconfig));
61 usb_unlock_device(udev);
64 static DEVICE_ATTR_RO(bMaxPower);
66 static ssize_t configuration_show(struct device *dev,
67 struct device_attribute *attr, char *buf)
69 struct usb_device *udev;
70 struct usb_host_config *actconfig;
73 udev = to_usb_device(dev);
74 rc = usb_lock_device_interruptible(udev);
77 actconfig = udev->actconfig;
78 if (actconfig && actconfig->string)
79 rc = sprintf(buf, "%s\n", actconfig->string);
80 usb_unlock_device(udev);
83 static DEVICE_ATTR_RO(configuration);
85 /* configuration value is always present, and r/w */
86 usb_actconfig_show(bConfigurationValue, "%u\n");
88 static ssize_t bConfigurationValue_store(struct device *dev,
89 struct device_attribute *attr,
90 const char *buf, size_t count)
92 struct usb_device *udev = to_usb_device(dev);
93 int config, value, rc;
95 if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
97 rc = usb_lock_device_interruptible(udev);
100 value = usb_set_configuration(udev, config);
101 usb_unlock_device(udev);
102 return (value < 0) ? value : count;
104 static DEVICE_ATTR_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,
105 bConfigurationValue_show, bConfigurationValue_store);
108 #define usb_string_attr(name) \
109 static ssize_t name##_show(struct device *dev, \
110 struct device_attribute *attr, char *buf) \
112 struct usb_device *udev; \
115 udev = to_usb_device(dev); \
116 retval = usb_lock_device_interruptible(udev); \
119 retval = sprintf(buf, "%s\n", udev->name); \
120 usb_unlock_device(udev); \
123 static DEVICE_ATTR_RO(name)
125 usb_string_attr(product);
126 usb_string_attr(manufacturer);
127 usb_string_attr(serial);
129 static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
132 struct usb_device *udev;
135 udev = to_usb_device(dev);
137 switch (udev->speed) {
141 case USB_SPEED_UNKNOWN:
148 case USB_SPEED_WIRELESS:
151 case USB_SPEED_SUPER:
154 case USB_SPEED_SUPER_PLUS:
160 return sprintf(buf, "%s\n", speed);
162 static DEVICE_ATTR_RO(speed);
164 static ssize_t busnum_show(struct device *dev, struct device_attribute *attr,
167 struct usb_device *udev;
169 udev = to_usb_device(dev);
170 return sprintf(buf, "%d\n", udev->bus->busnum);
172 static DEVICE_ATTR_RO(busnum);
174 static ssize_t devnum_show(struct device *dev, struct device_attribute *attr,
177 struct usb_device *udev;
179 udev = to_usb_device(dev);
180 return sprintf(buf, "%d\n", udev->devnum);
182 static DEVICE_ATTR_RO(devnum);
184 static ssize_t devpath_show(struct device *dev, struct device_attribute *attr,
187 struct usb_device *udev;
189 udev = to_usb_device(dev);
190 return sprintf(buf, "%s\n", udev->devpath);
192 static DEVICE_ATTR_RO(devpath);
194 static ssize_t version_show(struct device *dev, struct device_attribute *attr,
197 struct usb_device *udev;
200 udev = to_usb_device(dev);
201 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
202 return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
204 static DEVICE_ATTR_RO(version);
206 static ssize_t maxchild_show(struct device *dev, struct device_attribute *attr,
209 struct usb_device *udev;
211 udev = to_usb_device(dev);
212 return sprintf(buf, "%d\n", udev->maxchild);
214 static DEVICE_ATTR_RO(maxchild);
216 static ssize_t quirks_show(struct device *dev, struct device_attribute *attr,
219 struct usb_device *udev;
221 udev = to_usb_device(dev);
222 return sprintf(buf, "0x%x\n", udev->quirks);
224 static DEVICE_ATTR_RO(quirks);
226 static ssize_t avoid_reset_quirk_show(struct device *dev,
227 struct device_attribute *attr, char *buf)
229 struct usb_device *udev;
231 udev = to_usb_device(dev);
232 return sprintf(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET));
235 static ssize_t avoid_reset_quirk_store(struct device *dev,
236 struct device_attribute *attr,
237 const char *buf, size_t count)
239 struct usb_device *udev = to_usb_device(dev);
242 if (sscanf(buf, "%d", &val) != 1 || val < 0 || val > 1)
244 rc = usb_lock_device_interruptible(udev);
248 udev->quirks |= USB_QUIRK_RESET;
250 udev->quirks &= ~USB_QUIRK_RESET;
251 usb_unlock_device(udev);
254 static DEVICE_ATTR_RW(avoid_reset_quirk);
256 static ssize_t urbnum_show(struct device *dev, struct device_attribute *attr,
259 struct usb_device *udev;
261 udev = to_usb_device(dev);
262 return sprintf(buf, "%d\n", atomic_read(&udev->urbnum));
264 static DEVICE_ATTR_RO(urbnum);
266 static ssize_t removable_show(struct device *dev, struct device_attribute *attr,
269 struct usb_device *udev;
272 udev = to_usb_device(dev);
274 switch (udev->removable) {
275 case USB_DEVICE_REMOVABLE:
278 case USB_DEVICE_FIXED:
285 return sprintf(buf, "%s\n", state);
287 static DEVICE_ATTR_RO(removable);
289 static ssize_t ltm_capable_show(struct device *dev,
290 struct device_attribute *attr, char *buf)
292 if (usb_device_supports_ltm(to_usb_device(dev)))
293 return sprintf(buf, "%s\n", "yes");
294 return sprintf(buf, "%s\n", "no");
296 static DEVICE_ATTR_RO(ltm_capable);
300 static ssize_t persist_show(struct device *dev, struct device_attribute *attr,
303 struct usb_device *udev = to_usb_device(dev);
305 return sprintf(buf, "%d\n", udev->persist_enabled);
308 static ssize_t persist_store(struct device *dev, struct device_attribute *attr,
309 const char *buf, size_t count)
311 struct usb_device *udev = to_usb_device(dev);
314 /* Hubs are always enabled for USB_PERSIST */
315 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
318 if (sscanf(buf, "%d", &value) != 1)
321 rc = usb_lock_device_interruptible(udev);
324 udev->persist_enabled = !!value;
325 usb_unlock_device(udev);
328 static DEVICE_ATTR_RW(persist);
330 static int add_persist_attributes(struct device *dev)
334 if (is_usb_device(dev)) {
335 struct usb_device *udev = to_usb_device(dev);
337 /* Hubs are automatically enabled for USB_PERSIST,
338 * no point in creating the attribute file.
340 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
341 rc = sysfs_add_file_to_group(&dev->kobj,
342 &dev_attr_persist.attr,
348 static void remove_persist_attributes(struct device *dev)
350 sysfs_remove_file_from_group(&dev->kobj,
351 &dev_attr_persist.attr,
355 static ssize_t connected_duration_show(struct device *dev,
356 struct device_attribute *attr, char *buf)
358 struct usb_device *udev = to_usb_device(dev);
360 return sprintf(buf, "%u\n",
361 jiffies_to_msecs(jiffies - udev->connect_time));
363 static DEVICE_ATTR_RO(connected_duration);
366 * If the device is resumed, the last time the device was suspended has
367 * been pre-subtracted from active_duration. We add the current time to
368 * get the duration that the device was actually active.
370 * If the device is suspended, the active_duration is up-to-date.
372 static ssize_t active_duration_show(struct device *dev,
373 struct device_attribute *attr, char *buf)
375 struct usb_device *udev = to_usb_device(dev);
378 if (udev->state != USB_STATE_SUSPENDED)
379 duration = jiffies_to_msecs(jiffies + udev->active_duration);
381 duration = jiffies_to_msecs(udev->active_duration);
382 return sprintf(buf, "%u\n", duration);
384 static DEVICE_ATTR_RO(active_duration);
386 static ssize_t autosuspend_show(struct device *dev,
387 struct device_attribute *attr, char *buf)
389 return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000);
392 static ssize_t autosuspend_store(struct device *dev,
393 struct device_attribute *attr, const char *buf,
398 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
399 value <= -INT_MAX/1000)
402 pm_runtime_set_autosuspend_delay(dev, value * 1000);
405 static DEVICE_ATTR_RW(autosuspend);
407 static const char on_string[] = "on";
408 static const char auto_string[] = "auto";
410 static void warn_level(void)
412 static int level_warned;
416 printk(KERN_WARNING "WARNING! power/level is deprecated; "
417 "use power/control instead\n");
421 static ssize_t level_show(struct device *dev, struct device_attribute *attr,
424 struct usb_device *udev = to_usb_device(dev);
425 const char *p = auto_string;
428 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
430 return sprintf(buf, "%s\n", p);
433 static ssize_t level_store(struct device *dev, struct device_attribute *attr,
434 const char *buf, size_t count)
436 struct usb_device *udev = to_usb_device(dev);
443 cp = memchr(buf, '\n', count);
447 rv = usb_lock_device_interruptible(udev);
451 if (len == sizeof on_string - 1 &&
452 strncmp(buf, on_string, len) == 0)
453 usb_disable_autosuspend(udev);
455 else if (len == sizeof auto_string - 1 &&
456 strncmp(buf, auto_string, len) == 0)
457 usb_enable_autosuspend(udev);
462 usb_unlock_device(udev);
465 static DEVICE_ATTR_RW(level);
467 static ssize_t usb2_hardware_lpm_show(struct device *dev,
468 struct device_attribute *attr, char *buf)
470 struct usb_device *udev = to_usb_device(dev);
473 if (udev->usb2_hw_lpm_allowed == 1)
478 return sprintf(buf, "%s\n", p);
481 static ssize_t usb2_hardware_lpm_store(struct device *dev,
482 struct device_attribute *attr,
483 const char *buf, size_t count)
485 struct usb_device *udev = to_usb_device(dev);
489 ret = usb_lock_device_interruptible(udev);
493 ret = strtobool(buf, &value);
496 udev->usb2_hw_lpm_allowed = value;
497 ret = usb_set_usb2_hardware_lpm(udev, value);
500 usb_unlock_device(udev);
507 static DEVICE_ATTR_RW(usb2_hardware_lpm);
509 static ssize_t usb2_lpm_l1_timeout_show(struct device *dev,
510 struct device_attribute *attr,
513 struct usb_device *udev = to_usb_device(dev);
514 return sprintf(buf, "%d\n", udev->l1_params.timeout);
517 static ssize_t usb2_lpm_l1_timeout_store(struct device *dev,
518 struct device_attribute *attr,
519 const char *buf, size_t count)
521 struct usb_device *udev = to_usb_device(dev);
524 if (kstrtou16(buf, 0, &timeout))
527 udev->l1_params.timeout = timeout;
531 static DEVICE_ATTR_RW(usb2_lpm_l1_timeout);
533 static ssize_t usb2_lpm_besl_show(struct device *dev,
534 struct device_attribute *attr, char *buf)
536 struct usb_device *udev = to_usb_device(dev);
537 return sprintf(buf, "%d\n", udev->l1_params.besl);
540 static ssize_t usb2_lpm_besl_store(struct device *dev,
541 struct device_attribute *attr,
542 const char *buf, size_t count)
544 struct usb_device *udev = to_usb_device(dev);
547 if (kstrtou8(buf, 0, &besl) || besl > 15)
550 udev->l1_params.besl = besl;
554 static DEVICE_ATTR_RW(usb2_lpm_besl);
556 static ssize_t usb3_hardware_lpm_u1_show(struct device *dev,
557 struct device_attribute *attr, char *buf)
559 struct usb_device *udev = to_usb_device(dev);
563 rc = usb_lock_device_interruptible(udev);
567 if (udev->usb3_lpm_u1_enabled)
572 usb_unlock_device(udev);
574 return sprintf(buf, "%s\n", p);
576 static DEVICE_ATTR_RO(usb3_hardware_lpm_u1);
578 static ssize_t usb3_hardware_lpm_u2_show(struct device *dev,
579 struct device_attribute *attr, char *buf)
581 struct usb_device *udev = to_usb_device(dev);
585 rc = usb_lock_device_interruptible(udev);
589 if (udev->usb3_lpm_u2_enabled)
594 usb_unlock_device(udev);
596 return sprintf(buf, "%s\n", p);
598 static DEVICE_ATTR_RO(usb3_hardware_lpm_u2);
600 static struct attribute *usb2_hardware_lpm_attr[] = {
601 &dev_attr_usb2_hardware_lpm.attr,
602 &dev_attr_usb2_lpm_l1_timeout.attr,
603 &dev_attr_usb2_lpm_besl.attr,
606 static struct attribute_group usb2_hardware_lpm_attr_group = {
607 .name = power_group_name,
608 .attrs = usb2_hardware_lpm_attr,
611 static struct attribute *usb3_hardware_lpm_attr[] = {
612 &dev_attr_usb3_hardware_lpm_u1.attr,
613 &dev_attr_usb3_hardware_lpm_u2.attr,
616 static struct attribute_group usb3_hardware_lpm_attr_group = {
617 .name = power_group_name,
618 .attrs = usb3_hardware_lpm_attr,
621 static struct attribute *power_attrs[] = {
622 &dev_attr_autosuspend.attr,
623 &dev_attr_level.attr,
624 &dev_attr_connected_duration.attr,
625 &dev_attr_active_duration.attr,
628 static struct attribute_group power_attr_group = {
629 .name = power_group_name,
630 .attrs = power_attrs,
633 static int add_power_attributes(struct device *dev)
637 if (is_usb_device(dev)) {
638 struct usb_device *udev = to_usb_device(dev);
639 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
640 if (udev->usb2_hw_lpm_capable == 1)
641 rc = sysfs_merge_group(&dev->kobj,
642 &usb2_hardware_lpm_attr_group);
643 if (udev->speed == USB_SPEED_SUPER &&
644 udev->lpm_capable == 1)
645 rc = sysfs_merge_group(&dev->kobj,
646 &usb3_hardware_lpm_attr_group);
652 static void remove_power_attributes(struct device *dev)
654 sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
655 sysfs_unmerge_group(&dev->kobj, &power_attr_group);
660 #define add_persist_attributes(dev) 0
661 #define remove_persist_attributes(dev) do {} while (0)
663 #define add_power_attributes(dev) 0
664 #define remove_power_attributes(dev) do {} while (0)
666 #endif /* CONFIG_PM */
669 /* Descriptor fields */
670 #define usb_descriptor_attr_le16(field, format_string) \
672 field##_show(struct device *dev, struct device_attribute *attr, \
675 struct usb_device *udev; \
677 udev = to_usb_device(dev); \
678 return sprintf(buf, format_string, \
679 le16_to_cpu(udev->descriptor.field)); \
681 static DEVICE_ATTR_RO(field)
683 usb_descriptor_attr_le16(idVendor, "%04x\n");
684 usb_descriptor_attr_le16(idProduct, "%04x\n");
685 usb_descriptor_attr_le16(bcdDevice, "%04x\n");
687 #define usb_descriptor_attr(field, format_string) \
689 field##_show(struct device *dev, struct device_attribute *attr, \
692 struct usb_device *udev; \
694 udev = to_usb_device(dev); \
695 return sprintf(buf, format_string, udev->descriptor.field); \
697 static DEVICE_ATTR_RO(field)
699 usb_descriptor_attr(bDeviceClass, "%02x\n");
700 usb_descriptor_attr(bDeviceSubClass, "%02x\n");
701 usb_descriptor_attr(bDeviceProtocol, "%02x\n");
702 usb_descriptor_attr(bNumConfigurations, "%d\n");
703 usb_descriptor_attr(bMaxPacketSize0, "%d\n");
706 /* show if the device is authorized (1) or not (0) */
707 static ssize_t authorized_show(struct device *dev,
708 struct device_attribute *attr, char *buf)
710 struct usb_device *usb_dev = to_usb_device(dev);
711 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
715 * Authorize a device to be used in the system
717 * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
719 static ssize_t authorized_store(struct device *dev,
720 struct device_attribute *attr, const char *buf,
724 struct usb_device *usb_dev = to_usb_device(dev);
726 result = sscanf(buf, "%u\n", &val);
730 result = usb_deauthorize_device(usb_dev);
732 result = usb_authorize_device(usb_dev);
733 return result < 0 ? result : size;
735 static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, S_IRUGO | S_IWUSR,
736 authorized_show, authorized_store);
738 /* "Safely remove a device" */
739 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
740 const char *buf, size_t count)
742 struct usb_device *udev = to_usb_device(dev);
745 usb_lock_device(udev);
746 if (udev->state != USB_STATE_NOTATTACHED) {
748 /* To avoid races, first unconfigure and then remove */
749 usb_set_configuration(udev, -1);
750 rc = usb_remove_device(udev);
754 usb_unlock_device(udev);
757 static DEVICE_ATTR_IGNORE_LOCKDEP(remove, S_IWUSR, NULL, remove_store);
760 static struct attribute *dev_attrs[] = {
761 /* current configuration's attributes */
762 &dev_attr_configuration.attr,
763 &dev_attr_bNumInterfaces.attr,
764 &dev_attr_bConfigurationValue.attr,
765 &dev_attr_bmAttributes.attr,
766 &dev_attr_bMaxPower.attr,
767 /* device attributes */
768 &dev_attr_urbnum.attr,
769 &dev_attr_idVendor.attr,
770 &dev_attr_idProduct.attr,
771 &dev_attr_bcdDevice.attr,
772 &dev_attr_bDeviceClass.attr,
773 &dev_attr_bDeviceSubClass.attr,
774 &dev_attr_bDeviceProtocol.attr,
775 &dev_attr_bNumConfigurations.attr,
776 &dev_attr_bMaxPacketSize0.attr,
777 &dev_attr_speed.attr,
778 &dev_attr_busnum.attr,
779 &dev_attr_devnum.attr,
780 &dev_attr_devpath.attr,
781 &dev_attr_version.attr,
782 &dev_attr_maxchild.attr,
783 &dev_attr_quirks.attr,
784 &dev_attr_avoid_reset_quirk.attr,
785 &dev_attr_authorized.attr,
786 &dev_attr_remove.attr,
787 &dev_attr_removable.attr,
788 &dev_attr_ltm_capable.attr,
791 static struct attribute_group dev_attr_grp = {
795 /* When modifying this list, be sure to modify dev_string_attrs_are_visible()
798 static struct attribute *dev_string_attrs[] = {
799 &dev_attr_manufacturer.attr,
800 &dev_attr_product.attr,
801 &dev_attr_serial.attr,
805 static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
806 struct attribute *a, int n)
808 struct device *dev = container_of(kobj, struct device, kobj);
809 struct usb_device *udev = to_usb_device(dev);
811 if (a == &dev_attr_manufacturer.attr) {
812 if (udev->manufacturer == NULL)
814 } else if (a == &dev_attr_product.attr) {
815 if (udev->product == NULL)
817 } else if (a == &dev_attr_serial.attr) {
818 if (udev->serial == NULL)
824 static struct attribute_group dev_string_attr_grp = {
825 .attrs = dev_string_attrs,
826 .is_visible = dev_string_attrs_are_visible,
829 const struct attribute_group *usb_device_groups[] = {
831 &dev_string_attr_grp,
835 /* Binary descriptors */
838 read_descriptors(struct file *filp, struct kobject *kobj,
839 struct bin_attribute *attr,
840 char *buf, loff_t off, size_t count)
842 struct device *dev = container_of(kobj, struct device, kobj);
843 struct usb_device *udev = to_usb_device(dev);
844 size_t nleft = count;
849 /* The binary attribute begins with the device descriptor.
850 * Following that are the raw descriptor entries for all the
851 * configurations (config plus subsidiary descriptors).
853 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
854 nleft > 0; ++cfgno) {
856 src = &udev->descriptor;
857 srclen = sizeof(struct usb_device_descriptor);
859 src = udev->rawdescriptors[cfgno];
860 srclen = __le16_to_cpu(udev->config[cfgno].desc.
864 n = min(nleft, srclen - (size_t) off);
865 memcpy(buf, src + off, n);
873 return count - nleft;
876 static struct bin_attribute dev_bin_attr_descriptors = {
877 .attr = {.name = "descriptors", .mode = 0444},
878 .read = read_descriptors,
879 .size = 18 + 65535, /* dev descr + max-size raw descriptor */
882 int usb_create_sysfs_dev_files(struct usb_device *udev)
884 struct device *dev = &udev->dev;
887 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
891 retval = add_persist_attributes(dev);
895 retval = add_power_attributes(dev);
900 usb_remove_sysfs_dev_files(udev);
904 void usb_remove_sysfs_dev_files(struct usb_device *udev)
906 struct device *dev = &udev->dev;
908 remove_power_attributes(dev);
909 remove_persist_attributes(dev);
910 device_remove_bin_file(dev, &dev_bin_attr_descriptors);
913 /* Interface Association Descriptor fields */
914 #define usb_intf_assoc_attr(field, format_string) \
916 iad_##field##_show(struct device *dev, struct device_attribute *attr, \
919 struct usb_interface *intf = to_usb_interface(dev); \
921 return sprintf(buf, format_string, \
922 intf->intf_assoc->field); \
924 static DEVICE_ATTR_RO(iad_##field)
926 usb_intf_assoc_attr(bFirstInterface, "%02x\n");
927 usb_intf_assoc_attr(bInterfaceCount, "%02d\n");
928 usb_intf_assoc_attr(bFunctionClass, "%02x\n");
929 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n");
930 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n");
932 /* Interface fields */
933 #define usb_intf_attr(field, format_string) \
935 field##_show(struct device *dev, struct device_attribute *attr, \
938 struct usb_interface *intf = to_usb_interface(dev); \
940 return sprintf(buf, format_string, \
941 intf->cur_altsetting->desc.field); \
943 static DEVICE_ATTR_RO(field)
945 usb_intf_attr(bInterfaceNumber, "%02x\n");
946 usb_intf_attr(bAlternateSetting, "%2d\n");
947 usb_intf_attr(bNumEndpoints, "%02x\n");
948 usb_intf_attr(bInterfaceClass, "%02x\n");
949 usb_intf_attr(bInterfaceSubClass, "%02x\n");
950 usb_intf_attr(bInterfaceProtocol, "%02x\n");
952 static ssize_t interface_show(struct device *dev, struct device_attribute *attr,
955 struct usb_interface *intf;
958 intf = to_usb_interface(dev);
959 string = ACCESS_ONCE(intf->cur_altsetting->string);
962 return sprintf(buf, "%s\n", string);
964 static DEVICE_ATTR_RO(interface);
966 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
969 struct usb_interface *intf;
970 struct usb_device *udev;
971 struct usb_host_interface *alt;
973 intf = to_usb_interface(dev);
974 udev = interface_to_usbdev(intf);
975 alt = ACCESS_ONCE(intf->cur_altsetting);
977 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
978 "ic%02Xisc%02Xip%02Xin%02X\n",
979 le16_to_cpu(udev->descriptor.idVendor),
980 le16_to_cpu(udev->descriptor.idProduct),
981 le16_to_cpu(udev->descriptor.bcdDevice),
982 udev->descriptor.bDeviceClass,
983 udev->descriptor.bDeviceSubClass,
984 udev->descriptor.bDeviceProtocol,
985 alt->desc.bInterfaceClass,
986 alt->desc.bInterfaceSubClass,
987 alt->desc.bInterfaceProtocol,
988 alt->desc.bInterfaceNumber);
990 static DEVICE_ATTR_RO(modalias);
992 static ssize_t supports_autosuspend_show(struct device *dev,
993 struct device_attribute *attr,
998 s = device_lock_interruptible(dev);
1001 /* Devices will be autosuspended even when an interface isn't claimed */
1002 s = (!dev->driver || to_usb_driver(dev->driver)->supports_autosuspend);
1005 return sprintf(buf, "%u\n", s);
1007 static DEVICE_ATTR_RO(supports_autosuspend);
1010 * interface_authorized_show - show authorization status of an USB interface
1011 * 1 is authorized, 0 is deauthorized
1013 static ssize_t interface_authorized_show(struct device *dev,
1014 struct device_attribute *attr, char *buf)
1016 struct usb_interface *intf = to_usb_interface(dev);
1018 return sprintf(buf, "%u\n", intf->authorized);
1022 * interface_authorized_store - authorize or deauthorize an USB interface
1024 static ssize_t interface_authorized_store(struct device *dev,
1025 struct device_attribute *attr, const char *buf, size_t count)
1027 struct usb_interface *intf = to_usb_interface(dev);
1030 if (strtobool(buf, &val) != 0)
1034 usb_authorize_interface(intf);
1036 usb_deauthorize_interface(intf);
1040 static struct device_attribute dev_attr_interface_authorized =
1041 __ATTR(authorized, S_IRUGO | S_IWUSR,
1042 interface_authorized_show, interface_authorized_store);
1044 static struct attribute *intf_attrs[] = {
1045 &dev_attr_bInterfaceNumber.attr,
1046 &dev_attr_bAlternateSetting.attr,
1047 &dev_attr_bNumEndpoints.attr,
1048 &dev_attr_bInterfaceClass.attr,
1049 &dev_attr_bInterfaceSubClass.attr,
1050 &dev_attr_bInterfaceProtocol.attr,
1051 &dev_attr_modalias.attr,
1052 &dev_attr_supports_autosuspend.attr,
1053 &dev_attr_interface_authorized.attr,
1056 static struct attribute_group intf_attr_grp = {
1057 .attrs = intf_attrs,
1060 static struct attribute *intf_assoc_attrs[] = {
1061 &dev_attr_iad_bFirstInterface.attr,
1062 &dev_attr_iad_bInterfaceCount.attr,
1063 &dev_attr_iad_bFunctionClass.attr,
1064 &dev_attr_iad_bFunctionSubClass.attr,
1065 &dev_attr_iad_bFunctionProtocol.attr,
1069 static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
1070 struct attribute *a, int n)
1072 struct device *dev = container_of(kobj, struct device, kobj);
1073 struct usb_interface *intf = to_usb_interface(dev);
1075 if (intf->intf_assoc == NULL)
1080 static struct attribute_group intf_assoc_attr_grp = {
1081 .attrs = intf_assoc_attrs,
1082 .is_visible = intf_assoc_attrs_are_visible,
1085 const struct attribute_group *usb_interface_groups[] = {
1087 &intf_assoc_attr_grp,
1091 void usb_create_sysfs_intf_files(struct usb_interface *intf)
1093 struct usb_device *udev = interface_to_usbdev(intf);
1094 struct usb_host_interface *alt = intf->cur_altsetting;
1096 if (intf->sysfs_files_created || intf->unregistering)
1099 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
1100 alt->string = usb_cache_string(udev, alt->desc.iInterface);
1101 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface))
1102 ; /* We don't actually care if the function fails. */
1103 intf->sysfs_files_created = 1;
1106 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
1108 if (!intf->sysfs_files_created)
1111 device_remove_file(&intf->dev, &dev_attr_interface);
1112 intf->sysfs_files_created = 0;