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13#include <linux/kernel.h>
14#include <linux/string.h>
15#include <linux/usb.h>
16#include <linux/usb/quirks.h>
17#include "usb.h"
18
19
20#define usb_actconfig_show(field, multiplier, format_string) \
21static ssize_t show_##field(struct device *dev, \
22 struct device_attribute *attr, char *buf) \
23{ \
24 struct usb_device *udev; \
25 struct usb_host_config *actconfig; \
26 \
27 udev = to_usb_device(dev); \
28 actconfig = udev->actconfig; \
29 if (actconfig) \
30 return sprintf(buf, format_string, \
31 actconfig->desc.field * multiplier); \
32 else \
33 return 0; \
34} \
35
36#define usb_actconfig_attr(field, multiplier, format_string) \
37usb_actconfig_show(field, multiplier, format_string) \
38static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
39
40usb_actconfig_attr(bNumInterfaces, 1, "%2d\n")
41usb_actconfig_attr(bmAttributes, 1, "%2x\n")
42usb_actconfig_attr(bMaxPower, 2, "%3dmA\n")
43
44static ssize_t show_configuration_string(struct device *dev,
45 struct device_attribute *attr, char *buf)
46{
47 struct usb_device *udev;
48 struct usb_host_config *actconfig;
49
50 udev = to_usb_device(dev);
51 actconfig = udev->actconfig;
52 if ((!actconfig) || (!actconfig->string))
53 return 0;
54 return sprintf(buf, "%s\n", actconfig->string);
55}
56static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL);
57
58
59usb_actconfig_show(bConfigurationValue, 1, "%u\n");
60
61static ssize_t
62set_bConfigurationValue(struct device *dev, struct device_attribute *attr,
63 const char *buf, size_t count)
64{
65 struct usb_device *udev = to_usb_device(dev);
66 int config, value;
67
68 if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
69 return -EINVAL;
70 usb_lock_device(udev);
71 value = usb_set_configuration(udev, config);
72 usb_unlock_device(udev);
73 return (value < 0) ? value : count;
74}
75
76static DEVICE_ATTR(bConfigurationValue, S_IRUGO | S_IWUSR,
77 show_bConfigurationValue, set_bConfigurationValue);
78
79
80#define usb_string_attr(name) \
81static ssize_t show_##name(struct device *dev, \
82 struct device_attribute *attr, char *buf) \
83{ \
84 struct usb_device *udev; \
85 \
86 udev = to_usb_device(dev); \
87 return sprintf(buf, "%s\n", udev->name); \
88} \
89static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
90
91usb_string_attr(product);
92usb_string_attr(manufacturer);
93usb_string_attr(serial);
94
95static ssize_t
96show_speed(struct device *dev, struct device_attribute *attr, char *buf)
97{
98 struct usb_device *udev;
99 char *speed;
100
101 udev = to_usb_device(dev);
102
103 switch (udev->speed) {
104 case USB_SPEED_LOW:
105 speed = "1.5";
106 break;
107 case USB_SPEED_UNKNOWN:
108 case USB_SPEED_FULL:
109 speed = "12";
110 break;
111 case USB_SPEED_HIGH:
112 speed = "480";
113 break;
114 default:
115 speed = "unknown";
116 }
117 return sprintf(buf, "%s\n", speed);
118}
119static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL);
120
121static ssize_t
122show_busnum(struct device *dev, struct device_attribute *attr, char *buf)
123{
124 struct usb_device *udev;
125
126 udev = to_usb_device(dev);
127 return sprintf(buf, "%d\n", udev->bus->busnum);
128}
129static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL);
130
131static ssize_t
132show_devnum(struct device *dev, struct device_attribute *attr, char *buf)
133{
134 struct usb_device *udev;
135
136 udev = to_usb_device(dev);
137 return sprintf(buf, "%d\n", udev->devnum);
138}
139static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL);
140
141static ssize_t
142show_version(struct device *dev, struct device_attribute *attr, char *buf)
143{
144 struct usb_device *udev;
145 u16 bcdUSB;
146
147 udev = to_usb_device(dev);
148 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
149 return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
150}
151static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
152
153static ssize_t
154show_maxchild(struct device *dev, struct device_attribute *attr, char *buf)
155{
156 struct usb_device *udev;
157
158 udev = to_usb_device(dev);
159 return sprintf(buf, "%d\n", udev->maxchild);
160}
161static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL);
162
163static ssize_t
164show_quirks(struct device *dev, struct device_attribute *attr, char *buf)
165{
166 struct usb_device *udev;
167
168 udev = to_usb_device(dev);
169 return sprintf(buf, "0x%x\n", udev->quirks);
170}
171static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);
172
173static ssize_t
174show_urbnum(struct device *dev, struct device_attribute *attr, char *buf)
175{
176 struct usb_device *udev;
177
178 udev = to_usb_device(dev);
179 return sprintf(buf, "%d\n", atomic_read(&udev->urbnum));
180}
181static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL);
182
183
184#ifdef CONFIG_PM
185
186static const char power_group[] = "power";
187
188static ssize_t
189show_persist(struct device *dev, struct device_attribute *attr, char *buf)
190{
191 struct usb_device *udev = to_usb_device(dev);
192
193 return sprintf(buf, "%d\n", udev->persist_enabled);
194}
195
196static ssize_t
197set_persist(struct device *dev, struct device_attribute *attr,
198 const char *buf, size_t count)
199{
200 struct usb_device *udev = to_usb_device(dev);
201 int value;
202
203
204 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
205 return -EPERM;
206
207 if (sscanf(buf, "%d", &value) != 1)
208 return -EINVAL;
209 usb_pm_lock(udev);
210 udev->persist_enabled = !!value;
211 usb_pm_unlock(udev);
212 return count;
213}
214
215static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
216
217static int add_persist_attributes(struct device *dev)
218{
219 int rc = 0;
220
221 if (is_usb_device(dev)) {
222 struct usb_device *udev = to_usb_device(dev);
223
224
225
226
227 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
228 rc = sysfs_add_file_to_group(&dev->kobj,
229 &dev_attr_persist.attr,
230 power_group);
231 }
232 return rc;
233}
234
235static void remove_persist_attributes(struct device *dev)
236{
237 sysfs_remove_file_from_group(&dev->kobj,
238 &dev_attr_persist.attr,
239 power_group);
240}
241#else
242
243#define add_persist_attributes(dev) 0
244#define remove_persist_attributes(dev) do {} while (0)
245
246#endif
247
248#ifdef CONFIG_USB_SUSPEND
249
250static ssize_t
251show_connected_duration(struct device *dev, struct device_attribute *attr,
252 char *buf)
253{
254 struct usb_device *udev = to_usb_device(dev);
255
256 return sprintf(buf, "%u\n",
257 jiffies_to_msecs(jiffies - udev->connect_time));
258}
259
260static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
261
262
263
264
265
266
267
268
269static ssize_t
270show_active_duration(struct device *dev, struct device_attribute *attr,
271 char *buf)
272{
273 struct usb_device *udev = to_usb_device(dev);
274 int duration;
275
276 if (udev->state != USB_STATE_SUSPENDED)
277 duration = jiffies_to_msecs(jiffies + udev->active_duration);
278 else
279 duration = jiffies_to_msecs(udev->active_duration);
280 return sprintf(buf, "%u\n", duration);
281}
282
283static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
284
285static ssize_t
286show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
287{
288 struct usb_device *udev = to_usb_device(dev);
289
290 return sprintf(buf, "%d\n", udev->autosuspend_delay / HZ);
291}
292
293static ssize_t
294set_autosuspend(struct device *dev, struct device_attribute *attr,
295 const char *buf, size_t count)
296{
297 struct usb_device *udev = to_usb_device(dev);
298 int value;
299
300 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/HZ ||
301 value <= - INT_MAX/HZ)
302 return -EINVAL;
303 value *= HZ;
304
305 udev->autosuspend_delay = value;
306 if (value >= 0)
307 usb_try_autosuspend_device(udev);
308 else {
309 if (usb_autoresume_device(udev) == 0)
310 usb_autosuspend_device(udev);
311 }
312 return count;
313}
314
315static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
316 show_autosuspend, set_autosuspend);
317
318static const char on_string[] = "on";
319static const char auto_string[] = "auto";
320static const char suspend_string[] = "suspend";
321
322static ssize_t
323show_level(struct device *dev, struct device_attribute *attr, char *buf)
324{
325 struct usb_device *udev = to_usb_device(dev);
326 const char *p = auto_string;
327
328 if (udev->state == USB_STATE_SUSPENDED) {
329 if (udev->autoresume_disabled)
330 p = suspend_string;
331 } else {
332 if (udev->autosuspend_disabled)
333 p = on_string;
334 }
335 return sprintf(buf, "%s\n", p);
336}
337
338static ssize_t
339set_level(struct device *dev, struct device_attribute *attr,
340 const char *buf, size_t count)
341{
342 struct usb_device *udev = to_usb_device(dev);
343 int len = count;
344 char *cp;
345 int rc = 0;
346 int old_autosuspend_disabled, old_autoresume_disabled;
347
348 cp = memchr(buf, '\n', count);
349 if (cp)
350 len = cp - buf;
351
352 usb_lock_device(udev);
353 old_autosuspend_disabled = udev->autosuspend_disabled;
354 old_autoresume_disabled = udev->autoresume_disabled;
355
356
357
358
359 if (len == sizeof on_string - 1 &&
360 strncmp(buf, on_string, len) == 0) {
361 udev->autosuspend_disabled = 1;
362 udev->autoresume_disabled = 0;
363 rc = usb_external_resume_device(udev, PMSG_USER_RESUME);
364
365 } else if (len == sizeof auto_string - 1 &&
366 strncmp(buf, auto_string, len) == 0) {
367 udev->autosuspend_disabled = 0;
368 udev->autoresume_disabled = 0;
369 rc = usb_external_resume_device(udev, PMSG_USER_RESUME);
370
371 } else if (len == sizeof suspend_string - 1 &&
372 strncmp(buf, suspend_string, len) == 0) {
373 udev->autosuspend_disabled = 0;
374 udev->autoresume_disabled = 1;
375 rc = usb_external_suspend_device(udev, PMSG_USER_SUSPEND);
376
377 } else
378 rc = -EINVAL;
379
380 if (rc) {
381 udev->autosuspend_disabled = old_autosuspend_disabled;
382 udev->autoresume_disabled = old_autoresume_disabled;
383 }
384 usb_unlock_device(udev);
385 return (rc < 0 ? rc : count);
386}
387
388static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
389
390static int add_power_attributes(struct device *dev)
391{
392 int rc = 0;
393
394 if (is_usb_device(dev)) {
395 rc = sysfs_add_file_to_group(&dev->kobj,
396 &dev_attr_autosuspend.attr,
397 power_group);
398 if (rc == 0)
399 rc = sysfs_add_file_to_group(&dev->kobj,
400 &dev_attr_level.attr,
401 power_group);
402 if (rc == 0)
403 rc = sysfs_add_file_to_group(&dev->kobj,
404 &dev_attr_connected_duration.attr,
405 power_group);
406 if (rc == 0)
407 rc = sysfs_add_file_to_group(&dev->kobj,
408 &dev_attr_active_duration.attr,
409 power_group);
410 }
411 return rc;
412}
413
414static void remove_power_attributes(struct device *dev)
415{
416 sysfs_remove_file_from_group(&dev->kobj,
417 &dev_attr_active_duration.attr,
418 power_group);
419 sysfs_remove_file_from_group(&dev->kobj,
420 &dev_attr_connected_duration.attr,
421 power_group);
422 sysfs_remove_file_from_group(&dev->kobj,
423 &dev_attr_level.attr,
424 power_group);
425 sysfs_remove_file_from_group(&dev->kobj,
426 &dev_attr_autosuspend.attr,
427 power_group);
428}
429
430#else
431
432#define add_power_attributes(dev) 0
433#define remove_power_attributes(dev) do {} while (0)
434
435#endif
436
437
438
439#define usb_descriptor_attr_le16(field, format_string) \
440static ssize_t \
441show_##field(struct device *dev, struct device_attribute *attr, \
442 char *buf) \
443{ \
444 struct usb_device *udev; \
445 \
446 udev = to_usb_device(dev); \
447 return sprintf(buf, format_string, \
448 le16_to_cpu(udev->descriptor.field)); \
449} \
450static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
451
452usb_descriptor_attr_le16(idVendor, "%04x\n")
453usb_descriptor_attr_le16(idProduct, "%04x\n")
454usb_descriptor_attr_le16(bcdDevice, "%04x\n")
455
456#define usb_descriptor_attr(field, format_string) \
457static ssize_t \
458show_##field(struct device *dev, struct device_attribute *attr, \
459 char *buf) \
460{ \
461 struct usb_device *udev; \
462 \
463 udev = to_usb_device(dev); \
464 return sprintf(buf, format_string, udev->descriptor.field); \
465} \
466static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
467
468usb_descriptor_attr(bDeviceClass, "%02x\n")
469usb_descriptor_attr(bDeviceSubClass, "%02x\n")
470usb_descriptor_attr(bDeviceProtocol, "%02x\n")
471usb_descriptor_attr(bNumConfigurations, "%d\n")
472usb_descriptor_attr(bMaxPacketSize0, "%d\n")
473
474
475
476
477static ssize_t usb_dev_authorized_show(struct device *dev,
478 struct device_attribute *attr,
479 char *buf)
480{
481 struct usb_device *usb_dev = to_usb_device(dev);
482 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
483}
484
485
486
487
488
489
490
491static ssize_t usb_dev_authorized_store(struct device *dev,
492 struct device_attribute *attr,
493 const char *buf, size_t size)
494{
495 ssize_t result;
496 struct usb_device *usb_dev = to_usb_device(dev);
497 unsigned val;
498 result = sscanf(buf, "%u\n", &val);
499 if (result != 1)
500 result = -EINVAL;
501 else if (val == 0)
502 result = usb_deauthorize_device(usb_dev);
503 else
504 result = usb_authorize_device(usb_dev);
505 return result < 0? result : size;
506}
507
508static DEVICE_ATTR(authorized, 0644,
509 usb_dev_authorized_show, usb_dev_authorized_store);
510
511
512static struct attribute *dev_attrs[] = {
513
514 &dev_attr_configuration.attr,
515 &dev_attr_bNumInterfaces.attr,
516 &dev_attr_bConfigurationValue.attr,
517 &dev_attr_bmAttributes.attr,
518 &dev_attr_bMaxPower.attr,
519 &dev_attr_urbnum.attr,
520
521 &dev_attr_idVendor.attr,
522 &dev_attr_idProduct.attr,
523 &dev_attr_bcdDevice.attr,
524 &dev_attr_bDeviceClass.attr,
525 &dev_attr_bDeviceSubClass.attr,
526 &dev_attr_bDeviceProtocol.attr,
527 &dev_attr_bNumConfigurations.attr,
528 &dev_attr_bMaxPacketSize0.attr,
529 &dev_attr_speed.attr,
530 &dev_attr_busnum.attr,
531 &dev_attr_devnum.attr,
532 &dev_attr_version.attr,
533 &dev_attr_maxchild.attr,
534 &dev_attr_quirks.attr,
535 &dev_attr_authorized.attr,
536 NULL,
537};
538static struct attribute_group dev_attr_grp = {
539 .attrs = dev_attrs,
540};
541
542
543
544
545static struct attribute *dev_string_attrs[] = {
546 &dev_attr_manufacturer.attr,
547 &dev_attr_product.attr,
548 &dev_attr_serial.attr,
549 NULL
550};
551
552static mode_t dev_string_attrs_are_visible(struct kobject *kobj,
553 struct attribute *a, int n)
554{
555 struct device *dev = container_of(kobj, struct device, kobj);
556 struct usb_device *udev = to_usb_device(dev);
557
558 if (a == &dev_attr_manufacturer.attr) {
559 if (udev->manufacturer == NULL)
560 return 0;
561 } else if (a == &dev_attr_product.attr) {
562 if (udev->product == NULL)
563 return 0;
564 } else if (a == &dev_attr_serial.attr) {
565 if (udev->serial == NULL)
566 return 0;
567 }
568 return a->mode;
569}
570
571static struct attribute_group dev_string_attr_grp = {
572 .attrs = dev_string_attrs,
573 .is_visible = dev_string_attrs_are_visible,
574};
575
576const struct attribute_group *usb_device_groups[] = {
577 &dev_attr_grp,
578 &dev_string_attr_grp,
579 NULL
580};
581
582
583
584static ssize_t
585read_descriptors(struct kobject *kobj, struct bin_attribute *attr,
586 char *buf, loff_t off, size_t count)
587{
588 struct device *dev = container_of(kobj, struct device, kobj);
589 struct usb_device *udev = to_usb_device(dev);
590 size_t nleft = count;
591 size_t srclen, n;
592 int cfgno;
593 void *src;
594
595
596
597
598
599 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
600 nleft > 0; ++cfgno) {
601 if (cfgno < 0) {
602 src = &udev->descriptor;
603 srclen = sizeof(struct usb_device_descriptor);
604 } else {
605 src = udev->rawdescriptors[cfgno];
606 srclen = __le16_to_cpu(udev->config[cfgno].desc.
607 wTotalLength);
608 }
609 if (off < srclen) {
610 n = min(nleft, srclen - (size_t) off);
611 memcpy(buf, src + off, n);
612 nleft -= n;
613 buf += n;
614 off = 0;
615 } else {
616 off -= srclen;
617 }
618 }
619 return count - nleft;
620}
621
622static struct bin_attribute dev_bin_attr_descriptors = {
623 .attr = {.name = "descriptors", .mode = 0444},
624 .read = read_descriptors,
625 .size = 18 + 65535,
626};
627
628int usb_create_sysfs_dev_files(struct usb_device *udev)
629{
630 struct device *dev = &udev->dev;
631 int retval;
632
633 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
634 if (retval)
635 goto error;
636
637 retval = add_persist_attributes(dev);
638 if (retval)
639 goto error;
640
641 retval = add_power_attributes(dev);
642 if (retval)
643 goto error;
644 return retval;
645error:
646 usb_remove_sysfs_dev_files(udev);
647 return retval;
648}
649
650void usb_remove_sysfs_dev_files(struct usb_device *udev)
651{
652 struct device *dev = &udev->dev;
653
654 remove_power_attributes(dev);
655 remove_persist_attributes(dev);
656 device_remove_bin_file(dev, &dev_bin_attr_descriptors);
657}
658
659
660#define usb_intf_assoc_attr(field, format_string) \
661static ssize_t \
662show_iad_##field(struct device *dev, struct device_attribute *attr, \
663 char *buf) \
664{ \
665 struct usb_interface *intf = to_usb_interface(dev); \
666 \
667 return sprintf(buf, format_string, \
668 intf->intf_assoc->field); \
669} \
670static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
671
672usb_intf_assoc_attr(bFirstInterface, "%02x\n")
673usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
674usb_intf_assoc_attr(bFunctionClass, "%02x\n")
675usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
676usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
677
678
679#define usb_intf_attr(field, format_string) \
680static ssize_t \
681show_##field(struct device *dev, struct device_attribute *attr, \
682 char *buf) \
683{ \
684 struct usb_interface *intf = to_usb_interface(dev); \
685 \
686 return sprintf(buf, format_string, \
687 intf->cur_altsetting->desc.field); \
688} \
689static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
690
691usb_intf_attr(bInterfaceNumber, "%02x\n")
692usb_intf_attr(bAlternateSetting, "%2d\n")
693usb_intf_attr(bNumEndpoints, "%02x\n")
694usb_intf_attr(bInterfaceClass, "%02x\n")
695usb_intf_attr(bInterfaceSubClass, "%02x\n")
696usb_intf_attr(bInterfaceProtocol, "%02x\n")
697
698static ssize_t show_interface_string(struct device *dev,
699 struct device_attribute *attr, char *buf)
700{
701 struct usb_interface *intf;
702 char *string;
703
704 intf = to_usb_interface(dev);
705 string = intf->cur_altsetting->string;
706 barrier();
707
708 if (!string)
709 return 0;
710 return sprintf(buf, "%s\n", string);
711}
712static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
713
714static ssize_t show_modalias(struct device *dev,
715 struct device_attribute *attr, char *buf)
716{
717 struct usb_interface *intf;
718 struct usb_device *udev;
719 struct usb_host_interface *alt;
720
721 intf = to_usb_interface(dev);
722 udev = interface_to_usbdev(intf);
723 alt = intf->cur_altsetting;
724
725 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
726 "ic%02Xisc%02Xip%02X\n",
727 le16_to_cpu(udev->descriptor.idVendor),
728 le16_to_cpu(udev->descriptor.idProduct),
729 le16_to_cpu(udev->descriptor.bcdDevice),
730 udev->descriptor.bDeviceClass,
731 udev->descriptor.bDeviceSubClass,
732 udev->descriptor.bDeviceProtocol,
733 alt->desc.bInterfaceClass,
734 alt->desc.bInterfaceSubClass,
735 alt->desc.bInterfaceProtocol);
736}
737static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
738
739static ssize_t show_supports_autosuspend(struct device *dev,
740 struct device_attribute *attr, char *buf)
741{
742 struct usb_interface *intf;
743 struct usb_device *udev;
744 int ret;
745
746 intf = to_usb_interface(dev);
747 udev = interface_to_usbdev(intf);
748
749 usb_lock_device(udev);
750
751 if (!intf->dev.driver ||
752 to_usb_driver(intf->dev.driver)->supports_autosuspend)
753 ret = sprintf(buf, "%u\n", 1);
754 else
755 ret = sprintf(buf, "%u\n", 0);
756 usb_unlock_device(udev);
757
758 return ret;
759}
760static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
761
762static struct attribute *intf_attrs[] = {
763 &dev_attr_bInterfaceNumber.attr,
764 &dev_attr_bAlternateSetting.attr,
765 &dev_attr_bNumEndpoints.attr,
766 &dev_attr_bInterfaceClass.attr,
767 &dev_attr_bInterfaceSubClass.attr,
768 &dev_attr_bInterfaceProtocol.attr,
769 &dev_attr_modalias.attr,
770 &dev_attr_supports_autosuspend.attr,
771 NULL,
772};
773static struct attribute_group intf_attr_grp = {
774 .attrs = intf_attrs,
775};
776
777static struct attribute *intf_assoc_attrs[] = {
778 &dev_attr_iad_bFirstInterface.attr,
779 &dev_attr_iad_bInterfaceCount.attr,
780 &dev_attr_iad_bFunctionClass.attr,
781 &dev_attr_iad_bFunctionSubClass.attr,
782 &dev_attr_iad_bFunctionProtocol.attr,
783 NULL,
784};
785
786static mode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
787 struct attribute *a, int n)
788{
789 struct device *dev = container_of(kobj, struct device, kobj);
790 struct usb_interface *intf = to_usb_interface(dev);
791
792 if (intf->intf_assoc == NULL)
793 return 0;
794 return a->mode;
795}
796
797static struct attribute_group intf_assoc_attr_grp = {
798 .attrs = intf_assoc_attrs,
799 .is_visible = intf_assoc_attrs_are_visible,
800};
801
802const struct attribute_group *usb_interface_groups[] = {
803 &intf_attr_grp,
804 &intf_assoc_attr_grp,
805 NULL
806};
807
808int usb_create_sysfs_intf_files(struct usb_interface *intf)
809{
810 struct usb_device *udev = interface_to_usbdev(intf);
811 struct usb_host_interface *alt = intf->cur_altsetting;
812 int retval;
813
814 if (intf->sysfs_files_created || intf->unregistering)
815 return 0;
816
817 if (alt->string == NULL &&
818 !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
819 alt->string = usb_cache_string(udev, alt->desc.iInterface);
820 if (alt->string)
821 retval = device_create_file(&intf->dev, &dev_attr_interface);
822 intf->sysfs_files_created = 1;
823 return 0;
824}
825
826void usb_remove_sysfs_intf_files(struct usb_interface *intf)
827{
828 if (!intf->sysfs_files_created)
829 return;
830
831 device_remove_file(&intf->dev, &dev_attr_interface);
832 intf->sysfs_files_created = 0;
833}
834
