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;
498 ret = usb_enable_usb2_hardware_lpm(udev);
500 ret = usb_disable_usb2_hardware_lpm(udev);
503 usb_unlock_device(udev);
510 static DEVICE_ATTR_RW(usb2_hardware_lpm);
512 static ssize_t usb2_lpm_l1_timeout_show(struct device *dev,
513 struct device_attribute *attr,
516 struct usb_device *udev = to_usb_device(dev);
517 return sprintf(buf, "%d\n", udev->l1_params.timeout);
520 static ssize_t usb2_lpm_l1_timeout_store(struct device *dev,
521 struct device_attribute *attr,
522 const char *buf, size_t count)
524 struct usb_device *udev = to_usb_device(dev);
527 if (kstrtou16(buf, 0, &timeout))
530 udev->l1_params.timeout = timeout;
534 static DEVICE_ATTR_RW(usb2_lpm_l1_timeout);
536 static ssize_t usb2_lpm_besl_show(struct device *dev,
537 struct device_attribute *attr, char *buf)
539 struct usb_device *udev = to_usb_device(dev);
540 return sprintf(buf, "%d\n", udev->l1_params.besl);
543 static ssize_t usb2_lpm_besl_store(struct device *dev,
544 struct device_attribute *attr,
545 const char *buf, size_t count)
547 struct usb_device *udev = to_usb_device(dev);
550 if (kstrtou8(buf, 0, &besl) || besl > 15)
553 udev->l1_params.besl = besl;
557 static DEVICE_ATTR_RW(usb2_lpm_besl);
559 static ssize_t usb3_hardware_lpm_u1_show(struct device *dev,
560 struct device_attribute *attr, char *buf)
562 struct usb_device *udev = to_usb_device(dev);
566 rc = usb_lock_device_interruptible(udev);
570 if (udev->usb3_lpm_u1_enabled)
575 usb_unlock_device(udev);
577 return sprintf(buf, "%s\n", p);
579 static DEVICE_ATTR_RO(usb3_hardware_lpm_u1);
581 static ssize_t usb3_hardware_lpm_u2_show(struct device *dev,
582 struct device_attribute *attr, char *buf)
584 struct usb_device *udev = to_usb_device(dev);
588 rc = usb_lock_device_interruptible(udev);
592 if (udev->usb3_lpm_u2_enabled)
597 usb_unlock_device(udev);
599 return sprintf(buf, "%s\n", p);
601 static DEVICE_ATTR_RO(usb3_hardware_lpm_u2);
603 static struct attribute *usb2_hardware_lpm_attr[] = {
604 &dev_attr_usb2_hardware_lpm.attr,
605 &dev_attr_usb2_lpm_l1_timeout.attr,
606 &dev_attr_usb2_lpm_besl.attr,
609 static struct attribute_group usb2_hardware_lpm_attr_group = {
610 .name = power_group_name,
611 .attrs = usb2_hardware_lpm_attr,
614 static struct attribute *usb3_hardware_lpm_attr[] = {
615 &dev_attr_usb3_hardware_lpm_u1.attr,
616 &dev_attr_usb3_hardware_lpm_u2.attr,
619 static struct attribute_group usb3_hardware_lpm_attr_group = {
620 .name = power_group_name,
621 .attrs = usb3_hardware_lpm_attr,
624 static struct attribute *power_attrs[] = {
625 &dev_attr_autosuspend.attr,
626 &dev_attr_level.attr,
627 &dev_attr_connected_duration.attr,
628 &dev_attr_active_duration.attr,
631 static struct attribute_group power_attr_group = {
632 .name = power_group_name,
633 .attrs = power_attrs,
636 static int add_power_attributes(struct device *dev)
640 if (is_usb_device(dev)) {
641 struct usb_device *udev = to_usb_device(dev);
642 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
643 if (udev->usb2_hw_lpm_capable == 1)
644 rc = sysfs_merge_group(&dev->kobj,
645 &usb2_hardware_lpm_attr_group);
646 if (udev->speed == USB_SPEED_SUPER &&
647 udev->lpm_capable == 1)
648 rc = sysfs_merge_group(&dev->kobj,
649 &usb3_hardware_lpm_attr_group);
655 static void remove_power_attributes(struct device *dev)
657 sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
658 sysfs_unmerge_group(&dev->kobj, &power_attr_group);
663 #define add_persist_attributes(dev) 0
664 #define remove_persist_attributes(dev) do {} while (0)
666 #define add_power_attributes(dev) 0
667 #define remove_power_attributes(dev) do {} while (0)
669 #endif /* CONFIG_PM */
672 /* Descriptor fields */
673 #define usb_descriptor_attr_le16(field, format_string) \
675 field##_show(struct device *dev, struct device_attribute *attr, \
678 struct usb_device *udev; \
680 udev = to_usb_device(dev); \
681 return sprintf(buf, format_string, \
682 le16_to_cpu(udev->descriptor.field)); \
684 static DEVICE_ATTR_RO(field)
686 usb_descriptor_attr_le16(idVendor, "%04x\n");
687 usb_descriptor_attr_le16(idProduct, "%04x\n");
688 usb_descriptor_attr_le16(bcdDevice, "%04x\n");
690 #define usb_descriptor_attr(field, format_string) \
692 field##_show(struct device *dev, struct device_attribute *attr, \
695 struct usb_device *udev; \
697 udev = to_usb_device(dev); \
698 return sprintf(buf, format_string, udev->descriptor.field); \
700 static DEVICE_ATTR_RO(field)
702 usb_descriptor_attr(bDeviceClass, "%02x\n");
703 usb_descriptor_attr(bDeviceSubClass, "%02x\n");
704 usb_descriptor_attr(bDeviceProtocol, "%02x\n");
705 usb_descriptor_attr(bNumConfigurations, "%d\n");
706 usb_descriptor_attr(bMaxPacketSize0, "%d\n");
709 /* show if the device is authorized (1) or not (0) */
710 static ssize_t authorized_show(struct device *dev,
711 struct device_attribute *attr, char *buf)
713 struct usb_device *usb_dev = to_usb_device(dev);
714 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
718 * Authorize a device to be used in the system
720 * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
722 static ssize_t authorized_store(struct device *dev,
723 struct device_attribute *attr, const char *buf,
727 struct usb_device *usb_dev = to_usb_device(dev);
729 result = sscanf(buf, "%u\n", &val);
733 result = usb_deauthorize_device(usb_dev);
735 result = usb_authorize_device(usb_dev);
736 return result < 0 ? result : size;
738 static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, S_IRUGO | S_IWUSR,
739 authorized_show, authorized_store);
741 /* "Safely remove a device" */
742 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
743 const char *buf, size_t count)
745 struct usb_device *udev = to_usb_device(dev);
748 usb_lock_device(udev);
749 if (udev->state != USB_STATE_NOTATTACHED) {
751 /* To avoid races, first unconfigure and then remove */
752 usb_set_configuration(udev, -1);
753 rc = usb_remove_device(udev);
757 usb_unlock_device(udev);
760 static DEVICE_ATTR_IGNORE_LOCKDEP(remove, S_IWUSR, NULL, remove_store);
763 static struct attribute *dev_attrs[] = {
764 /* current configuration's attributes */
765 &dev_attr_configuration.attr,
766 &dev_attr_bNumInterfaces.attr,
767 &dev_attr_bConfigurationValue.attr,
768 &dev_attr_bmAttributes.attr,
769 &dev_attr_bMaxPower.attr,
770 /* device attributes */
771 &dev_attr_urbnum.attr,
772 &dev_attr_idVendor.attr,
773 &dev_attr_idProduct.attr,
774 &dev_attr_bcdDevice.attr,
775 &dev_attr_bDeviceClass.attr,
776 &dev_attr_bDeviceSubClass.attr,
777 &dev_attr_bDeviceProtocol.attr,
778 &dev_attr_bNumConfigurations.attr,
779 &dev_attr_bMaxPacketSize0.attr,
780 &dev_attr_speed.attr,
781 &dev_attr_busnum.attr,
782 &dev_attr_devnum.attr,
783 &dev_attr_devpath.attr,
784 &dev_attr_version.attr,
785 &dev_attr_maxchild.attr,
786 &dev_attr_quirks.attr,
787 &dev_attr_avoid_reset_quirk.attr,
788 &dev_attr_authorized.attr,
789 &dev_attr_remove.attr,
790 &dev_attr_removable.attr,
791 &dev_attr_ltm_capable.attr,
794 static struct attribute_group dev_attr_grp = {
798 /* When modifying this list, be sure to modify dev_string_attrs_are_visible()
801 static struct attribute *dev_string_attrs[] = {
802 &dev_attr_manufacturer.attr,
803 &dev_attr_product.attr,
804 &dev_attr_serial.attr,
808 static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
809 struct attribute *a, int n)
811 struct device *dev = container_of(kobj, struct device, kobj);
812 struct usb_device *udev = to_usb_device(dev);
814 if (a == &dev_attr_manufacturer.attr) {
815 if (udev->manufacturer == NULL)
817 } else if (a == &dev_attr_product.attr) {
818 if (udev->product == NULL)
820 } else if (a == &dev_attr_serial.attr) {
821 if (udev->serial == NULL)
827 static struct attribute_group dev_string_attr_grp = {
828 .attrs = dev_string_attrs,
829 .is_visible = dev_string_attrs_are_visible,
832 const struct attribute_group *usb_device_groups[] = {
834 &dev_string_attr_grp,
838 /* Binary descriptors */
841 read_descriptors(struct file *filp, struct kobject *kobj,
842 struct bin_attribute *attr,
843 char *buf, loff_t off, size_t count)
845 struct device *dev = container_of(kobj, struct device, kobj);
846 struct usb_device *udev = to_usb_device(dev);
847 size_t nleft = count;
853 retval = usb_lock_device_interruptible(udev);
856 /* The binary attribute begins with the device descriptor.
857 * Following that are the raw descriptor entries for all the
858 * configurations (config plus subsidiary descriptors).
860 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
861 nleft > 0; ++cfgno) {
863 src = &udev->descriptor;
864 srclen = sizeof(struct usb_device_descriptor);
866 src = udev->rawdescriptors[cfgno];
867 srclen = __le16_to_cpu(udev->config[cfgno].desc.
871 n = min(nleft, srclen - (size_t) off);
872 memcpy(buf, src + off, n);
880 usb_unlock_device(udev);
881 return count - nleft;
884 static struct bin_attribute dev_bin_attr_descriptors = {
885 .attr = {.name = "descriptors", .mode = 0444},
886 .read = read_descriptors,
887 .size = 18 + 65535, /* dev descr + max-size raw descriptor */
890 int usb_create_sysfs_dev_files(struct usb_device *udev)
892 struct device *dev = &udev->dev;
895 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
899 retval = add_persist_attributes(dev);
903 retval = add_power_attributes(dev);
908 usb_remove_sysfs_dev_files(udev);
912 void usb_remove_sysfs_dev_files(struct usb_device *udev)
914 struct device *dev = &udev->dev;
916 remove_power_attributes(dev);
917 remove_persist_attributes(dev);
918 device_remove_bin_file(dev, &dev_bin_attr_descriptors);
921 /* Interface Association Descriptor fields */
922 #define usb_intf_assoc_attr(field, format_string) \
924 iad_##field##_show(struct device *dev, struct device_attribute *attr, \
927 struct usb_interface *intf = to_usb_interface(dev); \
929 return sprintf(buf, format_string, \
930 intf->intf_assoc->field); \
932 static DEVICE_ATTR_RO(iad_##field)
934 usb_intf_assoc_attr(bFirstInterface, "%02x\n");
935 usb_intf_assoc_attr(bInterfaceCount, "%02d\n");
936 usb_intf_assoc_attr(bFunctionClass, "%02x\n");
937 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n");
938 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n");
940 /* Interface fields */
941 #define usb_intf_attr(field, format_string) \
943 field##_show(struct device *dev, struct device_attribute *attr, \
946 struct usb_interface *intf = to_usb_interface(dev); \
948 return sprintf(buf, format_string, \
949 intf->cur_altsetting->desc.field); \
951 static DEVICE_ATTR_RO(field)
953 usb_intf_attr(bInterfaceNumber, "%02x\n");
954 usb_intf_attr(bAlternateSetting, "%2d\n");
955 usb_intf_attr(bNumEndpoints, "%02x\n");
956 usb_intf_attr(bInterfaceClass, "%02x\n");
957 usb_intf_attr(bInterfaceSubClass, "%02x\n");
958 usb_intf_attr(bInterfaceProtocol, "%02x\n");
960 static ssize_t interface_show(struct device *dev, struct device_attribute *attr,
963 struct usb_interface *intf;
966 intf = to_usb_interface(dev);
967 string = ACCESS_ONCE(intf->cur_altsetting->string);
970 return sprintf(buf, "%s\n", string);
972 static DEVICE_ATTR_RO(interface);
974 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
977 struct usb_interface *intf;
978 struct usb_device *udev;
979 struct usb_host_interface *alt;
981 intf = to_usb_interface(dev);
982 udev = interface_to_usbdev(intf);
983 alt = ACCESS_ONCE(intf->cur_altsetting);
985 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
986 "ic%02Xisc%02Xip%02Xin%02X\n",
987 le16_to_cpu(udev->descriptor.idVendor),
988 le16_to_cpu(udev->descriptor.idProduct),
989 le16_to_cpu(udev->descriptor.bcdDevice),
990 udev->descriptor.bDeviceClass,
991 udev->descriptor.bDeviceSubClass,
992 udev->descriptor.bDeviceProtocol,
993 alt->desc.bInterfaceClass,
994 alt->desc.bInterfaceSubClass,
995 alt->desc.bInterfaceProtocol,
996 alt->desc.bInterfaceNumber);
998 static DEVICE_ATTR_RO(modalias);
1000 static ssize_t supports_autosuspend_show(struct device *dev,
1001 struct device_attribute *attr,
1006 s = device_lock_interruptible(dev);
1009 /* Devices will be autosuspended even when an interface isn't claimed */
1010 s = (!dev->driver || to_usb_driver(dev->driver)->supports_autosuspend);
1013 return sprintf(buf, "%u\n", s);
1015 static DEVICE_ATTR_RO(supports_autosuspend);
1018 * interface_authorized_show - show authorization status of an USB interface
1019 * 1 is authorized, 0 is deauthorized
1021 static ssize_t interface_authorized_show(struct device *dev,
1022 struct device_attribute *attr, char *buf)
1024 struct usb_interface *intf = to_usb_interface(dev);
1026 return sprintf(buf, "%u\n", intf->authorized);
1030 * interface_authorized_store - authorize or deauthorize an USB interface
1032 static ssize_t interface_authorized_store(struct device *dev,
1033 struct device_attribute *attr, const char *buf, size_t count)
1035 struct usb_interface *intf = to_usb_interface(dev);
1038 if (strtobool(buf, &val) != 0)
1042 usb_authorize_interface(intf);
1044 usb_deauthorize_interface(intf);
1048 static struct device_attribute dev_attr_interface_authorized =
1049 __ATTR(authorized, S_IRUGO | S_IWUSR,
1050 interface_authorized_show, interface_authorized_store);
1052 static struct attribute *intf_attrs[] = {
1053 &dev_attr_bInterfaceNumber.attr,
1054 &dev_attr_bAlternateSetting.attr,
1055 &dev_attr_bNumEndpoints.attr,
1056 &dev_attr_bInterfaceClass.attr,
1057 &dev_attr_bInterfaceSubClass.attr,
1058 &dev_attr_bInterfaceProtocol.attr,
1059 &dev_attr_modalias.attr,
1060 &dev_attr_supports_autosuspend.attr,
1061 &dev_attr_interface_authorized.attr,
1064 static struct attribute_group intf_attr_grp = {
1065 .attrs = intf_attrs,
1068 static struct attribute *intf_assoc_attrs[] = {
1069 &dev_attr_iad_bFirstInterface.attr,
1070 &dev_attr_iad_bInterfaceCount.attr,
1071 &dev_attr_iad_bFunctionClass.attr,
1072 &dev_attr_iad_bFunctionSubClass.attr,
1073 &dev_attr_iad_bFunctionProtocol.attr,
1077 static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
1078 struct attribute *a, int n)
1080 struct device *dev = container_of(kobj, struct device, kobj);
1081 struct usb_interface *intf = to_usb_interface(dev);
1083 if (intf->intf_assoc == NULL)
1088 static struct attribute_group intf_assoc_attr_grp = {
1089 .attrs = intf_assoc_attrs,
1090 .is_visible = intf_assoc_attrs_are_visible,
1093 const struct attribute_group *usb_interface_groups[] = {
1095 &intf_assoc_attr_grp,
1099 void usb_create_sysfs_intf_files(struct usb_interface *intf)
1101 struct usb_device *udev = interface_to_usbdev(intf);
1102 struct usb_host_interface *alt = intf->cur_altsetting;
1104 if (intf->sysfs_files_created || intf->unregistering)
1107 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
1108 alt->string = usb_cache_string(udev, alt->desc.iInterface);
1109 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface))
1110 ; /* We don't actually care if the function fails. */
1111 intf->sysfs_files_created = 1;
1114 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
1116 if (!intf->sysfs_files_created)
1119 device_remove_file(&intf->dev, &dev_attr_interface);
1120 intf->sysfs_files_created = 0;