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, multiplier, 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 * multiplier); \
36 #define usb_actconfig_attr(field, multiplier, format_string) \
37 usb_actconfig_show(field, multiplier, format_string) \
38 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
40 usb_actconfig_attr(bNumInterfaces
, 1, "%2d\n")
41 usb_actconfig_attr(bmAttributes
, 1, "%2x\n")
42 usb_actconfig_attr(bMaxPower
, 2, "%3dmA\n")
44 static ssize_t
show_configuration_string(struct device
*dev
,
45 struct device_attribute
*attr
, char *buf
)
47 struct usb_device
*udev
;
48 struct usb_host_config
*actconfig
;
50 udev
= to_usb_device(dev
);
51 actconfig
= udev
->actconfig
;
52 if ((!actconfig
) || (!actconfig
->string
))
54 return sprintf(buf
, "%s\n", actconfig
->string
);
56 static DEVICE_ATTR(configuration
, S_IRUGO
, show_configuration_string
, NULL
);
58 /* configuration value is always present, and r/w */
59 usb_actconfig_show(bConfigurationValue
, 1, "%u\n");
62 set_bConfigurationValue(struct device
*dev
, struct device_attribute
*attr
,
63 const char *buf
, size_t count
)
65 struct usb_device
*udev
= to_usb_device(dev
);
68 if (sscanf(buf
, "%d", &config
) != 1 || config
< -1 || config
> 255)
70 usb_lock_device(udev
);
71 value
= usb_set_configuration(udev
, config
);
72 usb_unlock_device(udev
);
73 return (value
< 0) ? value
: count
;
76 static DEVICE_ATTR(bConfigurationValue
, S_IRUGO
| S_IWUSR
,
77 show_bConfigurationValue
, set_bConfigurationValue
);
80 #define usb_string_attr(name) \
81 static ssize_t show_##name(struct device *dev, \
82 struct device_attribute *attr, char *buf) \
84 struct usb_device *udev; \
87 udev = to_usb_device(dev); \
88 usb_lock_device(udev); \
89 retval = sprintf(buf, "%s\n", udev->name); \
90 usb_unlock_device(udev); \
93 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
95 usb_string_attr(product
);
96 usb_string_attr(manufacturer
);
97 usb_string_attr(serial
);
100 show_speed(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
102 struct usb_device
*udev
;
105 udev
= to_usb_device(dev
);
107 switch (udev
->speed
) {
111 case USB_SPEED_UNKNOWN
:
118 case USB_SPEED_WIRELESS
:
121 case USB_SPEED_SUPER
:
127 return sprintf(buf
, "%s\n", speed
);
129 static DEVICE_ATTR(speed
, S_IRUGO
, show_speed
, NULL
);
132 show_busnum(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
134 struct usb_device
*udev
;
136 udev
= to_usb_device(dev
);
137 return sprintf(buf
, "%d\n", udev
->bus
->busnum
);
139 static DEVICE_ATTR(busnum
, S_IRUGO
, show_busnum
, NULL
);
142 show_devnum(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
144 struct usb_device
*udev
;
146 udev
= to_usb_device(dev
);
147 return sprintf(buf
, "%d\n", udev
->devnum
);
149 static DEVICE_ATTR(devnum
, S_IRUGO
, show_devnum
, NULL
);
152 show_devpath(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
154 struct usb_device
*udev
;
156 udev
= to_usb_device(dev
);
157 return sprintf(buf
, "%s\n", udev
->devpath
);
159 static DEVICE_ATTR(devpath
, S_IRUGO
, show_devpath
, NULL
);
162 show_version(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
164 struct usb_device
*udev
;
167 udev
= to_usb_device(dev
);
168 bcdUSB
= le16_to_cpu(udev
->descriptor
.bcdUSB
);
169 return sprintf(buf
, "%2x.%02x\n", bcdUSB
>> 8, bcdUSB
& 0xff);
171 static DEVICE_ATTR(version
, S_IRUGO
, show_version
, NULL
);
174 show_maxchild(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
176 struct usb_device
*udev
;
178 udev
= to_usb_device(dev
);
179 return sprintf(buf
, "%d\n", udev
->maxchild
);
181 static DEVICE_ATTR(maxchild
, S_IRUGO
, show_maxchild
, NULL
);
184 show_quirks(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
186 struct usb_device
*udev
;
188 udev
= to_usb_device(dev
);
189 return sprintf(buf
, "0x%x\n", udev
->quirks
);
191 static DEVICE_ATTR(quirks
, S_IRUGO
, show_quirks
, NULL
);
194 show_avoid_reset_quirk(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
196 struct usb_device
*udev
;
198 udev
= to_usb_device(dev
);
199 return sprintf(buf
, "%d\n", !!(udev
->quirks
& USB_QUIRK_RESET_MORPHS
));
203 set_avoid_reset_quirk(struct device
*dev
, struct device_attribute
*attr
,
204 const char *buf
, size_t count
)
206 struct usb_device
*udev
= to_usb_device(dev
);
209 if (sscanf(buf
, "%d", &config
) != 1 || config
< 0 || config
> 1)
211 usb_lock_device(udev
);
213 udev
->quirks
|= USB_QUIRK_RESET_MORPHS
;
215 udev
->quirks
&= ~USB_QUIRK_RESET_MORPHS
;
216 usb_unlock_device(udev
);
220 static DEVICE_ATTR(avoid_reset_quirk
, S_IRUGO
| S_IWUSR
,
221 show_avoid_reset_quirk
, set_avoid_reset_quirk
);
224 show_urbnum(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
226 struct usb_device
*udev
;
228 udev
= to_usb_device(dev
);
229 return sprintf(buf
, "%d\n", atomic_read(&udev
->urbnum
));
231 static DEVICE_ATTR(urbnum
, S_IRUGO
, show_urbnum
, NULL
);
236 static const char power_group
[] = "power";
239 show_persist(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
241 struct usb_device
*udev
= to_usb_device(dev
);
243 return sprintf(buf
, "%d\n", udev
->persist_enabled
);
247 set_persist(struct device
*dev
, struct device_attribute
*attr
,
248 const char *buf
, size_t count
)
250 struct usb_device
*udev
= to_usb_device(dev
);
253 /* Hubs are always enabled for USB_PERSIST */
254 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
)
257 if (sscanf(buf
, "%d", &value
) != 1)
260 usb_lock_device(udev
);
261 udev
->persist_enabled
= !!value
;
262 usb_unlock_device(udev
);
266 static DEVICE_ATTR(persist
, S_IRUGO
| S_IWUSR
, show_persist
, set_persist
);
268 static int add_persist_attributes(struct device
*dev
)
272 if (is_usb_device(dev
)) {
273 struct usb_device
*udev
= to_usb_device(dev
);
275 /* Hubs are automatically enabled for USB_PERSIST,
276 * no point in creating the attribute file.
278 if (udev
->descriptor
.bDeviceClass
!= USB_CLASS_HUB
)
279 rc
= sysfs_add_file_to_group(&dev
->kobj
,
280 &dev_attr_persist
.attr
,
286 static void remove_persist_attributes(struct device
*dev
)
288 sysfs_remove_file_from_group(&dev
->kobj
,
289 &dev_attr_persist
.attr
,
294 #define add_persist_attributes(dev) 0
295 #define remove_persist_attributes(dev) do {} while (0)
297 #endif /* CONFIG_PM */
299 #ifdef CONFIG_USB_SUSPEND
302 show_connected_duration(struct device
*dev
, struct device_attribute
*attr
,
305 struct usb_device
*udev
= to_usb_device(dev
);
307 return sprintf(buf
, "%u\n",
308 jiffies_to_msecs(jiffies
- udev
->connect_time
));
311 static DEVICE_ATTR(connected_duration
, S_IRUGO
, show_connected_duration
, NULL
);
314 * If the device is resumed, the last time the device was suspended has
315 * been pre-subtracted from active_duration. We add the current time to
316 * get the duration that the device was actually active.
318 * If the device is suspended, the active_duration is up-to-date.
321 show_active_duration(struct device
*dev
, struct device_attribute
*attr
,
324 struct usb_device
*udev
= to_usb_device(dev
);
327 if (udev
->state
!= USB_STATE_SUSPENDED
)
328 duration
= jiffies_to_msecs(jiffies
+ udev
->active_duration
);
330 duration
= jiffies_to_msecs(udev
->active_duration
);
331 return sprintf(buf
, "%u\n", duration
);
334 static DEVICE_ATTR(active_duration
, S_IRUGO
, show_active_duration
, NULL
);
337 show_autosuspend(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
339 struct usb_device
*udev
= to_usb_device(dev
);
341 return sprintf(buf
, "%d\n", udev
->autosuspend_delay
/ HZ
);
345 set_autosuspend(struct device
*dev
, struct device_attribute
*attr
,
346 const char *buf
, size_t count
)
348 struct usb_device
*udev
= to_usb_device(dev
);
349 int value
, old_delay
;
352 if (sscanf(buf
, "%d", &value
) != 1 || value
>= INT_MAX
/HZ
||
353 value
<= - INT_MAX
/HZ
)
357 usb_lock_device(udev
);
358 old_delay
= udev
->autosuspend_delay
;
359 udev
->autosuspend_delay
= value
;
361 if (old_delay
< 0) { /* Autosuspend wasn't allowed */
363 usb_autosuspend_device(udev
);
364 } else { /* Autosuspend was allowed */
366 rc
= usb_autoresume_device(udev
);
369 udev
->autosuspend_delay
= old_delay
;
372 usb_try_autosuspend_device(udev
);
376 usb_unlock_device(udev
);
380 static DEVICE_ATTR(autosuspend
, S_IRUGO
| S_IWUSR
,
381 show_autosuspend
, set_autosuspend
);
383 static const char on_string
[] = "on";
384 static const char auto_string
[] = "auto";
386 static void warn_level(void) {
387 static int level_warned
;
391 printk(KERN_WARNING
"WARNING! power/level is deprecated; "
392 "use power/control instead\n");
397 show_level(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
399 struct usb_device
*udev
= to_usb_device(dev
);
400 const char *p
= auto_string
;
403 if (udev
->state
!= USB_STATE_SUSPENDED
&& !udev
->dev
.power
.runtime_auto
)
405 return sprintf(buf
, "%s\n", p
);
409 set_level(struct device
*dev
, struct device_attribute
*attr
,
410 const char *buf
, size_t count
)
412 struct usb_device
*udev
= to_usb_device(dev
);
418 cp
= memchr(buf
, '\n', count
);
422 usb_lock_device(udev
);
424 if (len
== sizeof on_string
- 1 &&
425 strncmp(buf
, on_string
, len
) == 0)
426 usb_disable_autosuspend(udev
);
428 else if (len
== sizeof auto_string
- 1 &&
429 strncmp(buf
, auto_string
, len
) == 0)
430 usb_enable_autosuspend(udev
);
435 usb_unlock_device(udev
);
439 static DEVICE_ATTR(level
, S_IRUGO
| S_IWUSR
, show_level
, set_level
);
441 static int add_power_attributes(struct device
*dev
)
445 if (is_usb_device(dev
)) {
446 rc
= sysfs_add_file_to_group(&dev
->kobj
,
447 &dev_attr_autosuspend
.attr
,
450 rc
= sysfs_add_file_to_group(&dev
->kobj
,
451 &dev_attr_level
.attr
,
454 rc
= sysfs_add_file_to_group(&dev
->kobj
,
455 &dev_attr_connected_duration
.attr
,
458 rc
= sysfs_add_file_to_group(&dev
->kobj
,
459 &dev_attr_active_duration
.attr
,
465 static void remove_power_attributes(struct device
*dev
)
467 sysfs_remove_file_from_group(&dev
->kobj
,
468 &dev_attr_active_duration
.attr
,
470 sysfs_remove_file_from_group(&dev
->kobj
,
471 &dev_attr_connected_duration
.attr
,
473 sysfs_remove_file_from_group(&dev
->kobj
,
474 &dev_attr_level
.attr
,
476 sysfs_remove_file_from_group(&dev
->kobj
,
477 &dev_attr_autosuspend
.attr
,
483 #define add_power_attributes(dev) 0
484 #define remove_power_attributes(dev) do {} while (0)
486 #endif /* CONFIG_USB_SUSPEND */
489 /* Descriptor fields */
490 #define usb_descriptor_attr_le16(field, format_string) \
492 show_##field(struct device *dev, struct device_attribute *attr, \
495 struct usb_device *udev; \
497 udev = to_usb_device(dev); \
498 return sprintf(buf, format_string, \
499 le16_to_cpu(udev->descriptor.field)); \
501 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
503 usb_descriptor_attr_le16(idVendor
, "%04x\n")
504 usb_descriptor_attr_le16(idProduct
, "%04x\n")
505 usb_descriptor_attr_le16(bcdDevice
, "%04x\n")
507 #define usb_descriptor_attr(field, format_string) \
509 show_##field(struct device *dev, struct device_attribute *attr, \
512 struct usb_device *udev; \
514 udev = to_usb_device(dev); \
515 return sprintf(buf, format_string, udev->descriptor.field); \
517 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
519 usb_descriptor_attr(bDeviceClass
, "%02x\n")
520 usb_descriptor_attr(bDeviceSubClass
, "%02x\n")
521 usb_descriptor_attr(bDeviceProtocol
, "%02x\n")
522 usb_descriptor_attr(bNumConfigurations
, "%d\n")
523 usb_descriptor_attr(bMaxPacketSize0
, "%d\n")
527 /* show if the device is authorized (1) or not (0) */
528 static ssize_t
usb_dev_authorized_show(struct device
*dev
,
529 struct device_attribute
*attr
,
532 struct usb_device
*usb_dev
= to_usb_device(dev
);
533 return snprintf(buf
, PAGE_SIZE
, "%u\n", usb_dev
->authorized
);
538 * Authorize a device to be used in the system
540 * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
542 static ssize_t
usb_dev_authorized_store(struct device
*dev
,
543 struct device_attribute
*attr
,
544 const char *buf
, size_t size
)
547 struct usb_device
*usb_dev
= to_usb_device(dev
);
549 result
= sscanf(buf
, "%u\n", &val
);
553 result
= usb_deauthorize_device(usb_dev
);
555 result
= usb_authorize_device(usb_dev
);
556 return result
< 0? result
: size
;
559 static DEVICE_ATTR(authorized
, 0644,
560 usb_dev_authorized_show
, usb_dev_authorized_store
);
562 /* "Safely remove a device" */
563 static ssize_t
usb_remove_store(struct device
*dev
,
564 struct device_attribute
*attr
,
565 const char *buf
, size_t count
)
567 struct usb_device
*udev
= to_usb_device(dev
);
570 usb_lock_device(udev
);
571 if (udev
->state
!= USB_STATE_NOTATTACHED
) {
573 /* To avoid races, first unconfigure and then remove */
574 usb_set_configuration(udev
, -1);
575 rc
= usb_remove_device(udev
);
579 usb_unlock_device(udev
);
582 static DEVICE_ATTR(remove
, 0200, NULL
, usb_remove_store
);
585 static struct attribute
*dev_attrs
[] = {
586 /* current configuration's attributes */
587 &dev_attr_configuration
.attr
,
588 &dev_attr_bNumInterfaces
.attr
,
589 &dev_attr_bConfigurationValue
.attr
,
590 &dev_attr_bmAttributes
.attr
,
591 &dev_attr_bMaxPower
.attr
,
592 /* device attributes */
593 &dev_attr_urbnum
.attr
,
594 &dev_attr_idVendor
.attr
,
595 &dev_attr_idProduct
.attr
,
596 &dev_attr_bcdDevice
.attr
,
597 &dev_attr_bDeviceClass
.attr
,
598 &dev_attr_bDeviceSubClass
.attr
,
599 &dev_attr_bDeviceProtocol
.attr
,
600 &dev_attr_bNumConfigurations
.attr
,
601 &dev_attr_bMaxPacketSize0
.attr
,
602 &dev_attr_speed
.attr
,
603 &dev_attr_busnum
.attr
,
604 &dev_attr_devnum
.attr
,
605 &dev_attr_devpath
.attr
,
606 &dev_attr_version
.attr
,
607 &dev_attr_maxchild
.attr
,
608 &dev_attr_quirks
.attr
,
609 &dev_attr_avoid_reset_quirk
.attr
,
610 &dev_attr_authorized
.attr
,
611 &dev_attr_remove
.attr
,
614 static struct attribute_group dev_attr_grp
= {
618 /* When modifying this list, be sure to modify dev_string_attrs_are_visible()
621 static struct attribute
*dev_string_attrs
[] = {
622 &dev_attr_manufacturer
.attr
,
623 &dev_attr_product
.attr
,
624 &dev_attr_serial
.attr
,
628 static mode_t
dev_string_attrs_are_visible(struct kobject
*kobj
,
629 struct attribute
*a
, int n
)
631 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
632 struct usb_device
*udev
= to_usb_device(dev
);
634 if (a
== &dev_attr_manufacturer
.attr
) {
635 if (udev
->manufacturer
== NULL
)
637 } else if (a
== &dev_attr_product
.attr
) {
638 if (udev
->product
== NULL
)
640 } else if (a
== &dev_attr_serial
.attr
) {
641 if (udev
->serial
== NULL
)
647 static struct attribute_group dev_string_attr_grp
= {
648 .attrs
= dev_string_attrs
,
649 .is_visible
= dev_string_attrs_are_visible
,
652 const struct attribute_group
*usb_device_groups
[] = {
654 &dev_string_attr_grp
,
658 /* Binary descriptors */
661 read_descriptors(struct file
*filp
, struct kobject
*kobj
,
662 struct bin_attribute
*attr
,
663 char *buf
, loff_t off
, size_t count
)
665 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
666 struct usb_device
*udev
= to_usb_device(dev
);
667 size_t nleft
= count
;
672 /* The binary attribute begins with the device descriptor.
673 * Following that are the raw descriptor entries for all the
674 * configurations (config plus subsidiary descriptors).
676 for (cfgno
= -1; cfgno
< udev
->descriptor
.bNumConfigurations
&&
677 nleft
> 0; ++cfgno
) {
679 src
= &udev
->descriptor
;
680 srclen
= sizeof(struct usb_device_descriptor
);
682 src
= udev
->rawdescriptors
[cfgno
];
683 srclen
= __le16_to_cpu(udev
->config
[cfgno
].desc
.
687 n
= min(nleft
, srclen
- (size_t) off
);
688 memcpy(buf
, src
+ off
, n
);
696 return count
- nleft
;
699 static struct bin_attribute dev_bin_attr_descriptors
= {
700 .attr
= {.name
= "descriptors", .mode
= 0444},
701 .read
= read_descriptors
,
702 .size
= 18 + 65535, /* dev descr + max-size raw descriptor */
705 int usb_create_sysfs_dev_files(struct usb_device
*udev
)
707 struct device
*dev
= &udev
->dev
;
710 retval
= device_create_bin_file(dev
, &dev_bin_attr_descriptors
);
714 retval
= add_persist_attributes(dev
);
718 retval
= add_power_attributes(dev
);
723 usb_remove_sysfs_dev_files(udev
);
727 void usb_remove_sysfs_dev_files(struct usb_device
*udev
)
729 struct device
*dev
= &udev
->dev
;
731 remove_power_attributes(dev
);
732 remove_persist_attributes(dev
);
733 device_remove_bin_file(dev
, &dev_bin_attr_descriptors
);
736 /* Interface Accociation Descriptor fields */
737 #define usb_intf_assoc_attr(field, format_string) \
739 show_iad_##field(struct device *dev, struct device_attribute *attr, \
742 struct usb_interface *intf = to_usb_interface(dev); \
744 return sprintf(buf, format_string, \
745 intf->intf_assoc->field); \
747 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
749 usb_intf_assoc_attr(bFirstInterface
, "%02x\n")
750 usb_intf_assoc_attr(bInterfaceCount
, "%02d\n")
751 usb_intf_assoc_attr(bFunctionClass
, "%02x\n")
752 usb_intf_assoc_attr(bFunctionSubClass
, "%02x\n")
753 usb_intf_assoc_attr(bFunctionProtocol
, "%02x\n")
755 /* Interface fields */
756 #define usb_intf_attr(field, format_string) \
758 show_##field(struct device *dev, struct device_attribute *attr, \
761 struct usb_interface *intf = to_usb_interface(dev); \
763 return sprintf(buf, format_string, \
764 intf->cur_altsetting->desc.field); \
766 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
768 usb_intf_attr(bInterfaceNumber
, "%02x\n")
769 usb_intf_attr(bAlternateSetting
, "%2d\n")
770 usb_intf_attr(bNumEndpoints
, "%02x\n")
771 usb_intf_attr(bInterfaceClass
, "%02x\n")
772 usb_intf_attr(bInterfaceSubClass
, "%02x\n")
773 usb_intf_attr(bInterfaceProtocol
, "%02x\n")
775 static ssize_t
show_interface_string(struct device
*dev
,
776 struct device_attribute
*attr
, char *buf
)
778 struct usb_interface
*intf
;
781 intf
= to_usb_interface(dev
);
782 string
= intf
->cur_altsetting
->string
;
783 barrier(); /* The altsetting might change! */
787 return sprintf(buf
, "%s\n", string
);
789 static DEVICE_ATTR(interface
, S_IRUGO
, show_interface_string
, NULL
);
791 static ssize_t
show_modalias(struct device
*dev
,
792 struct device_attribute
*attr
, char *buf
)
794 struct usb_interface
*intf
;
795 struct usb_device
*udev
;
796 struct usb_host_interface
*alt
;
798 intf
= to_usb_interface(dev
);
799 udev
= interface_to_usbdev(intf
);
800 alt
= intf
->cur_altsetting
;
802 return sprintf(buf
, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
803 "ic%02Xisc%02Xip%02X\n",
804 le16_to_cpu(udev
->descriptor
.idVendor
),
805 le16_to_cpu(udev
->descriptor
.idProduct
),
806 le16_to_cpu(udev
->descriptor
.bcdDevice
),
807 udev
->descriptor
.bDeviceClass
,
808 udev
->descriptor
.bDeviceSubClass
,
809 udev
->descriptor
.bDeviceProtocol
,
810 alt
->desc
.bInterfaceClass
,
811 alt
->desc
.bInterfaceSubClass
,
812 alt
->desc
.bInterfaceProtocol
);
814 static DEVICE_ATTR(modalias
, S_IRUGO
, show_modalias
, NULL
);
816 static ssize_t
show_supports_autosuspend(struct device
*dev
,
817 struct device_attribute
*attr
, char *buf
)
819 struct usb_interface
*intf
;
820 struct usb_device
*udev
;
823 intf
= to_usb_interface(dev
);
824 udev
= interface_to_usbdev(intf
);
826 usb_lock_device(udev
);
827 /* Devices will be autosuspended even when an interface isn't claimed */
828 if (!intf
->dev
.driver
||
829 to_usb_driver(intf
->dev
.driver
)->supports_autosuspend
)
830 ret
= sprintf(buf
, "%u\n", 1);
832 ret
= sprintf(buf
, "%u\n", 0);
833 usb_unlock_device(udev
);
837 static DEVICE_ATTR(supports_autosuspend
, S_IRUGO
, show_supports_autosuspend
, NULL
);
839 static struct attribute
*intf_attrs
[] = {
840 &dev_attr_bInterfaceNumber
.attr
,
841 &dev_attr_bAlternateSetting
.attr
,
842 &dev_attr_bNumEndpoints
.attr
,
843 &dev_attr_bInterfaceClass
.attr
,
844 &dev_attr_bInterfaceSubClass
.attr
,
845 &dev_attr_bInterfaceProtocol
.attr
,
846 &dev_attr_modalias
.attr
,
847 &dev_attr_supports_autosuspend
.attr
,
850 static struct attribute_group intf_attr_grp
= {
854 static struct attribute
*intf_assoc_attrs
[] = {
855 &dev_attr_iad_bFirstInterface
.attr
,
856 &dev_attr_iad_bInterfaceCount
.attr
,
857 &dev_attr_iad_bFunctionClass
.attr
,
858 &dev_attr_iad_bFunctionSubClass
.attr
,
859 &dev_attr_iad_bFunctionProtocol
.attr
,
863 static mode_t
intf_assoc_attrs_are_visible(struct kobject
*kobj
,
864 struct attribute
*a
, int n
)
866 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
867 struct usb_interface
*intf
= to_usb_interface(dev
);
869 if (intf
->intf_assoc
== NULL
)
874 static struct attribute_group intf_assoc_attr_grp
= {
875 .attrs
= intf_assoc_attrs
,
876 .is_visible
= intf_assoc_attrs_are_visible
,
879 const struct attribute_group
*usb_interface_groups
[] = {
881 &intf_assoc_attr_grp
,
885 int usb_create_sysfs_intf_files(struct usb_interface
*intf
)
887 struct usb_device
*udev
= interface_to_usbdev(intf
);
888 struct usb_host_interface
*alt
= intf
->cur_altsetting
;
891 if (intf
->sysfs_files_created
|| intf
->unregistering
)
894 if (alt
->string
== NULL
&&
895 !(udev
->quirks
& USB_QUIRK_CONFIG_INTF_STRINGS
))
896 alt
->string
= usb_cache_string(udev
, alt
->desc
.iInterface
);
898 retval
= device_create_file(&intf
->dev
, &dev_attr_interface
);
899 intf
->sysfs_files_created
= 1;
903 void usb_remove_sysfs_intf_files(struct usb_interface
*intf
)
905 if (!intf
->sysfs_files_created
)
908 device_remove_file(&intf
->dev
, &dev_attr_interface
);
909 intf
->sysfs_files_created
= 0;