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1/*
2 * drivers/usb/core/sysfs.c
3 *
4 * (C) Copyright 2002 David Brownell
5 * (C) Copyright 2002,2004 Greg Kroah-Hartman
6 * (C) Copyright 2002,2004 IBM Corp.
7 *
8 * All of the sysfs file attributes for usb devices and interfaces.
9 *
10 */
11
12
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/* Active configuration fields */
20#define usb_actconfig_show(field, format_string) \
21static ssize_t field##_show(struct device *dev, \
22 struct device_attribute *attr, char *buf) \
23{ \
24 struct usb_device *udev; \
25 struct usb_host_config *actconfig; \
26 ssize_t rc; \
27 \
28 udev = to_usb_device(dev); \
29 rc = usb_lock_device_interruptible(udev); \
30 if (rc < 0) \
31 return -EINTR; \
32 actconfig = udev->actconfig; \
33 if (actconfig) \
34 rc = sprintf(buf, format_string, \
35 actconfig->desc.field); \
36 usb_unlock_device(udev); \
37 return rc; \
38} \
39
40#define usb_actconfig_attr(field, format_string) \
41 usb_actconfig_show(field, format_string) \
42 static DEVICE_ATTR_RO(field)
43
44usb_actconfig_attr(bNumInterfaces, "%2d\n");
45usb_actconfig_attr(bmAttributes, "%2x\n");
46
47static ssize_t bMaxPower_show(struct device *dev,
48 struct device_attribute *attr, char *buf)
49{
50 struct usb_device *udev;
51 struct usb_host_config *actconfig;
52 ssize_t rc;
53
54 udev = to_usb_device(dev);
55 rc = usb_lock_device_interruptible(udev);
56 if (rc < 0)
57 return -EINTR;
58 actconfig = udev->actconfig;
59 if (actconfig)
60 rc = sprintf(buf, "%dmA\n", usb_get_max_power(udev, actconfig));
61 usb_unlock_device(udev);
62 return rc;
63}
64static DEVICE_ATTR_RO(bMaxPower);
65
66static ssize_t configuration_show(struct device *dev,
67 struct device_attribute *attr, char *buf)
68{
69 struct usb_device *udev;
70 struct usb_host_config *actconfig;
71 ssize_t rc;
72
73 udev = to_usb_device(dev);
74 rc = usb_lock_device_interruptible(udev);
75 if (rc < 0)
76 return -EINTR;
77 actconfig = udev->actconfig;
78 if (actconfig && actconfig->string)
79 rc = sprintf(buf, "%s\n", actconfig->string);
80 usb_unlock_device(udev);
81 return rc;
82}
83static DEVICE_ATTR_RO(configuration);
84
85/* configuration value is always present, and r/w */
86usb_actconfig_show(bConfigurationValue, "%u\n");
87
88static ssize_t bConfigurationValue_store(struct device *dev,
89 struct device_attribute *attr,
90 const char *buf, size_t count)
91{
92 struct usb_device *udev = to_usb_device(dev);
93 int config, value, rc;
94
95 if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
96 return -EINVAL;
97 rc = usb_lock_device_interruptible(udev);
98 if (rc < 0)
99 return -EINTR;
100 value = usb_set_configuration(udev, config);
101 usb_unlock_device(udev);
102 return (value < 0) ? value : count;
103}
104static DEVICE_ATTR_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,
105 bConfigurationValue_show, bConfigurationValue_store);
106
107/* String fields */
108#define usb_string_attr(name) \
109static ssize_t name##_show(struct device *dev, \
110 struct device_attribute *attr, char *buf) \
111{ \
112 struct usb_device *udev; \
113 int retval; \
114 \
115 udev = to_usb_device(dev); \
116 retval = usb_lock_device_interruptible(udev); \
117 if (retval < 0) \
118 return -EINTR; \
119 retval = sprintf(buf, "%s\n", udev->name); \
120 usb_unlock_device(udev); \
121 return retval; \
122} \
123static DEVICE_ATTR_RO(name)
124
125usb_string_attr(product);
126usb_string_attr(manufacturer);
127usb_string_attr(serial);
128
129static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
130 char *buf)
131{
132 struct usb_device *udev;
133 char *speed;
134
135 udev = to_usb_device(dev);
136
137 switch (udev->speed) {
138 case USB_SPEED_LOW:
139 speed = "1.5";
140 break;
141 case USB_SPEED_UNKNOWN:
142 case USB_SPEED_FULL:
143 speed = "12";
144 break;
145 case USB_SPEED_HIGH:
146 speed = "480";
147 break;
148 case USB_SPEED_WIRELESS:
149 speed = "480";
150 break;
151 case USB_SPEED_SUPER:
152 speed = "5000";
153 break;
154 case USB_SPEED_SUPER_PLUS:
155 speed = "10000";
156 break;
157 default:
158 speed = "unknown";
159 }
160 return sprintf(buf, "%s\n", speed);
161}
162static DEVICE_ATTR_RO(speed);
163
164static ssize_t busnum_show(struct device *dev, struct device_attribute *attr,
165 char *buf)
166{
167 struct usb_device *udev;
168
169 udev = to_usb_device(dev);
170 return sprintf(buf, "%d\n", udev->bus->busnum);
171}
172static DEVICE_ATTR_RO(busnum);
173
174static ssize_t devnum_show(struct device *dev, struct device_attribute *attr,
175 char *buf)
176{
177 struct usb_device *udev;
178
179 udev = to_usb_device(dev);
180 return sprintf(buf, "%d\n", udev->devnum);
181}
182static DEVICE_ATTR_RO(devnum);
183
184static ssize_t devpath_show(struct device *dev, struct device_attribute *attr,
185 char *buf)
186{
187 struct usb_device *udev;
188
189 udev = to_usb_device(dev);
190 return sprintf(buf, "%s\n", udev->devpath);
191}
192static DEVICE_ATTR_RO(devpath);
193
194static ssize_t version_show(struct device *dev, struct device_attribute *attr,
195 char *buf)
196{
197 struct usb_device *udev;
198 u16 bcdUSB;
199
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);
203}
204static DEVICE_ATTR_RO(version);
205
206static ssize_t maxchild_show(struct device *dev, struct device_attribute *attr,
207 char *buf)
208{
209 struct usb_device *udev;
210
211 udev = to_usb_device(dev);
212 return sprintf(buf, "%d\n", udev->maxchild);
213}
214static DEVICE_ATTR_RO(maxchild);
215
216static ssize_t quirks_show(struct device *dev, struct device_attribute *attr,
217 char *buf)
218{
219 struct usb_device *udev;
220
221 udev = to_usb_device(dev);
222 return sprintf(buf, "0x%x\n", udev->quirks);
223}
224static DEVICE_ATTR_RO(quirks);
225
226static ssize_t avoid_reset_quirk_show(struct device *dev,
227 struct device_attribute *attr, char *buf)
228{
229 struct usb_device *udev;
230
231 udev = to_usb_device(dev);
232 return sprintf(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET));
233}
234
235static ssize_t avoid_reset_quirk_store(struct device *dev,
236 struct device_attribute *attr,
237 const char *buf, size_t count)
238{
239 struct usb_device *udev = to_usb_device(dev);
240 int val, rc;
241
242 if (sscanf(buf, "%d", &val) != 1 || val < 0 || val > 1)
243 return -EINVAL;
244 rc = usb_lock_device_interruptible(udev);
245 if (rc < 0)
246 return -EINTR;
247 if (val)
248 udev->quirks |= USB_QUIRK_RESET;
249 else
250 udev->quirks &= ~USB_QUIRK_RESET;
251 usb_unlock_device(udev);
252 return count;
253}
254static DEVICE_ATTR_RW(avoid_reset_quirk);
255
256static ssize_t urbnum_show(struct device *dev, struct device_attribute *attr,
257 char *buf)
258{
259 struct usb_device *udev;
260
261 udev = to_usb_device(dev);
262 return sprintf(buf, "%d\n", atomic_read(&udev->urbnum));
263}
264static DEVICE_ATTR_RO(urbnum);
265
266static ssize_t removable_show(struct device *dev, struct device_attribute *attr,
267 char *buf)
268{
269 struct usb_device *udev;
270 char *state;
271
272 udev = to_usb_device(dev);
273
274 switch (udev->removable) {
275 case USB_DEVICE_REMOVABLE:
276 state = "removable";
277 break;
278 case USB_DEVICE_FIXED:
279 state = "fixed";
280 break;
281 default:
282 state = "unknown";
283 }
284
285 return sprintf(buf, "%s\n", state);
286}
287static DEVICE_ATTR_RO(removable);
288
289static ssize_t ltm_capable_show(struct device *dev,
290 struct device_attribute *attr, char *buf)
291{
292 if (usb_device_supports_ltm(to_usb_device(dev)))
293 return sprintf(buf, "%s\n", "yes");
294 return sprintf(buf, "%s\n", "no");
295}
296static DEVICE_ATTR_RO(ltm_capable);
297
298#ifdef CONFIG_PM
299
300static ssize_t persist_show(struct device *dev, struct device_attribute *attr,
301 char *buf)
302{
303 struct usb_device *udev = to_usb_device(dev);
304
305 return sprintf(buf, "%d\n", udev->persist_enabled);
306}
307
308static ssize_t persist_store(struct device *dev, struct device_attribute *attr,
309 const char *buf, size_t count)
310{
311 struct usb_device *udev = to_usb_device(dev);
312 int value, rc;
313
314 /* Hubs are always enabled for USB_PERSIST */
315 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
316 return -EPERM;
317
318 if (sscanf(buf, "%d", &value) != 1)
319 return -EINVAL;
320
321 rc = usb_lock_device_interruptible(udev);
322 if (rc < 0)
323 return -EINTR;
324 udev->persist_enabled = !!value;
325 usb_unlock_device(udev);
326 return count;
327}
328static DEVICE_ATTR_RW(persist);
329
330static int add_persist_attributes(struct device *dev)
331{
332 int rc = 0;
333
334 if (is_usb_device(dev)) {
335 struct usb_device *udev = to_usb_device(dev);
336
337 /* Hubs are automatically enabled for USB_PERSIST,
338 * no point in creating the attribute file.
339 */
340 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
341 rc = sysfs_add_file_to_group(&dev->kobj,
342 &dev_attr_persist.attr,
343 power_group_name);
344 }
345 return rc;
346}
347
348static void remove_persist_attributes(struct device *dev)
349{
350 sysfs_remove_file_from_group(&dev->kobj,
351 &dev_attr_persist.attr,
352 power_group_name);
353}
354
355static ssize_t connected_duration_show(struct device *dev,
356 struct device_attribute *attr, char *buf)
357{
358 struct usb_device *udev = to_usb_device(dev);
359
360 return sprintf(buf, "%u\n",
361 jiffies_to_msecs(jiffies - udev->connect_time));
362}
363static DEVICE_ATTR_RO(connected_duration);
364
365/*
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.
369 *
370 * If the device is suspended, the active_duration is up-to-date.
371 */
372static ssize_t active_duration_show(struct device *dev,
373 struct device_attribute *attr, char *buf)
374{
375 struct usb_device *udev = to_usb_device(dev);
376 int duration;
377
378 if (udev->state != USB_STATE_SUSPENDED)
379 duration = jiffies_to_msecs(jiffies + udev->active_duration);
380 else
381 duration = jiffies_to_msecs(udev->active_duration);
382 return sprintf(buf, "%u\n", duration);
383}
384static DEVICE_ATTR_RO(active_duration);
385
386static ssize_t autosuspend_show(struct device *dev,
387 struct device_attribute *attr, char *buf)
388{
389 return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000);
390}
391
392static ssize_t autosuspend_store(struct device *dev,
393 struct device_attribute *attr, const char *buf,
394 size_t count)
395{
396 int value;
397
398 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
399 value <= -INT_MAX/1000)
400 return -EINVAL;
401
402 pm_runtime_set_autosuspend_delay(dev, value * 1000);
403 return count;
404}
405static DEVICE_ATTR_RW(autosuspend);
406
407static const char on_string[] = "on";
408static const char auto_string[] = "auto";
409
410static void warn_level(void)
411{
412 static int level_warned;
413
414 if (!level_warned) {
415 level_warned = 1;
416 printk(KERN_WARNING "WARNING! power/level is deprecated; "
417 "use power/control instead\n");
418 }
419}
420
421static ssize_t level_show(struct device *dev, struct device_attribute *attr,
422 char *buf)
423{
424 struct usb_device *udev = to_usb_device(dev);
425 const char *p = auto_string;
426
427 warn_level();
428 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
429 p = on_string;
430 return sprintf(buf, "%s\n", p);
431}
432
433static ssize_t level_store(struct device *dev, struct device_attribute *attr,
434 const char *buf, size_t count)
435{
436 struct usb_device *udev = to_usb_device(dev);
437 int len = count;
438 char *cp;
439 int rc = count;
440 int rv;
441
442 warn_level();
443 cp = memchr(buf, '\n', count);
444 if (cp)
445 len = cp - buf;
446
447 rv = usb_lock_device_interruptible(udev);
448 if (rv < 0)
449 return -EINTR;
450
451 if (len == sizeof on_string - 1 &&
452 strncmp(buf, on_string, len) == 0)
453 usb_disable_autosuspend(udev);
454
455 else if (len == sizeof auto_string - 1 &&
456 strncmp(buf, auto_string, len) == 0)
457 usb_enable_autosuspend(udev);
458
459 else
460 rc = -EINVAL;
461
462 usb_unlock_device(udev);
463 return rc;
464}
465static DEVICE_ATTR_RW(level);
466
467static ssize_t usb2_hardware_lpm_show(struct device *dev,
468 struct device_attribute *attr, char *buf)
469{
470 struct usb_device *udev = to_usb_device(dev);
471 const char *p;
472
473 if (udev->usb2_hw_lpm_allowed == 1)
474 p = "enabled";
475 else
476 p = "disabled";
477
478 return sprintf(buf, "%s\n", p);
479}
480
481static ssize_t usb2_hardware_lpm_store(struct device *dev,
482 struct device_attribute *attr,
483 const char *buf, size_t count)
484{
485 struct usb_device *udev = to_usb_device(dev);
486 bool value;
487 int ret;
488
489 ret = usb_lock_device_interruptible(udev);
490 if (ret < 0)
491 return -EINTR;
492
493 ret = strtobool(buf, &value);
494
495 if (!ret) {
496 udev->usb2_hw_lpm_allowed = value;
497 ret = usb_set_usb2_hardware_lpm(udev, value);
498 }
499
500 usb_unlock_device(udev);
501
502 if (!ret)
503 return count;
504
505 return ret;
506}
507static DEVICE_ATTR_RW(usb2_hardware_lpm);
508
509static ssize_t usb2_lpm_l1_timeout_show(struct device *dev,
510 struct device_attribute *attr,
511 char *buf)
512{
513 struct usb_device *udev = to_usb_device(dev);
514 return sprintf(buf, "%d\n", udev->l1_params.timeout);
515}
516
517static ssize_t usb2_lpm_l1_timeout_store(struct device *dev,
518 struct device_attribute *attr,
519 const char *buf, size_t count)
520{
521 struct usb_device *udev = to_usb_device(dev);
522 u16 timeout;
523
524 if (kstrtou16(buf, 0, &timeout))
525 return -EINVAL;
526
527 udev->l1_params.timeout = timeout;
528
529 return count;
530}
531static DEVICE_ATTR_RW(usb2_lpm_l1_timeout);
532
533static ssize_t usb2_lpm_besl_show(struct device *dev,
534 struct device_attribute *attr, char *buf)
535{
536 struct usb_device *udev = to_usb_device(dev);
537 return sprintf(buf, "%d\n", udev->l1_params.besl);
538}
539
540static ssize_t usb2_lpm_besl_store(struct device *dev,
541 struct device_attribute *attr,
542 const char *buf, size_t count)
543{
544 struct usb_device *udev = to_usb_device(dev);
545 u8 besl;
546
547 if (kstrtou8(buf, 0, &besl) || besl > 15)
548 return -EINVAL;
549
550 udev->l1_params.besl = besl;
551
552 return count;
553}
554static DEVICE_ATTR_RW(usb2_lpm_besl);
555
556static ssize_t usb3_hardware_lpm_u1_show(struct device *dev,
557 struct device_attribute *attr, char *buf)
558{
559 struct usb_device *udev = to_usb_device(dev);
560 const char *p;
561 int rc;
562
563 rc = usb_lock_device_interruptible(udev);
564 if (rc < 0)
565 return -EINTR;
566
567 if (udev->usb3_lpm_u1_enabled)
568 p = "enabled";
569 else
570 p = "disabled";
571
572 usb_unlock_device(udev);
573
574 return sprintf(buf, "%s\n", p);
575}
576static DEVICE_ATTR_RO(usb3_hardware_lpm_u1);
577
578static ssize_t usb3_hardware_lpm_u2_show(struct device *dev,
579 struct device_attribute *attr, char *buf)
580{
581 struct usb_device *udev = to_usb_device(dev);
582 const char *p;
583 int rc;
584
585 rc = usb_lock_device_interruptible(udev);
586 if (rc < 0)
587 return -EINTR;
588
589 if (udev->usb3_lpm_u2_enabled)
590 p = "enabled";
591 else
592 p = "disabled";
593
594 usb_unlock_device(udev);
595
596 return sprintf(buf, "%s\n", p);
597}
598static DEVICE_ATTR_RO(usb3_hardware_lpm_u2);
599
600static 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,
604 NULL,
605};
606static struct attribute_group usb2_hardware_lpm_attr_group = {
607 .name = power_group_name,
608 .attrs = usb2_hardware_lpm_attr,
609};
610
611static struct attribute *usb3_hardware_lpm_attr[] = {
612 &dev_attr_usb3_hardware_lpm_u1.attr,
613 &dev_attr_usb3_hardware_lpm_u2.attr,
614 NULL,
615};
616static struct attribute_group usb3_hardware_lpm_attr_group = {
617 .name = power_group_name,
618 .attrs = usb3_hardware_lpm_attr,
619};
620
621static 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,
626 NULL,
627};
628static struct attribute_group power_attr_group = {
629 .name = power_group_name,
630 .attrs = power_attrs,
631};
632
633static int add_power_attributes(struct device *dev)
634{
635 int rc = 0;
636
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);
647 }
648
649 return rc;
650}
651
652static void remove_power_attributes(struct device *dev)
653{
654 sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
655 sysfs_unmerge_group(&dev->kobj, &power_attr_group);
656}
657
658#else
659
660#define add_persist_attributes(dev) 0
661#define remove_persist_attributes(dev) do {} while (0)
662
663#define add_power_attributes(dev) 0
664#define remove_power_attributes(dev) do {} while (0)
665
666#endif /* CONFIG_PM */
667
668
669/* Descriptor fields */
670#define usb_descriptor_attr_le16(field, format_string) \
671static ssize_t \
672field##_show(struct device *dev, struct device_attribute *attr, \
673 char *buf) \
674{ \
675 struct usb_device *udev; \
676 \
677 udev = to_usb_device(dev); \
678 return sprintf(buf, format_string, \
679 le16_to_cpu(udev->descriptor.field)); \
680} \
681static DEVICE_ATTR_RO(field)
682
683usb_descriptor_attr_le16(idVendor, "%04x\n");
684usb_descriptor_attr_le16(idProduct, "%04x\n");
685usb_descriptor_attr_le16(bcdDevice, "%04x\n");
686
687#define usb_descriptor_attr(field, format_string) \
688static ssize_t \
689field##_show(struct device *dev, struct device_attribute *attr, \
690 char *buf) \
691{ \
692 struct usb_device *udev; \
693 \
694 udev = to_usb_device(dev); \
695 return sprintf(buf, format_string, udev->descriptor.field); \
696} \
697static DEVICE_ATTR_RO(field)
698
699usb_descriptor_attr(bDeviceClass, "%02x\n");
700usb_descriptor_attr(bDeviceSubClass, "%02x\n");
701usb_descriptor_attr(bDeviceProtocol, "%02x\n");
702usb_descriptor_attr(bNumConfigurations, "%d\n");
703usb_descriptor_attr(bMaxPacketSize0, "%d\n");
704
705
706/* show if the device is authorized (1) or not (0) */
707static ssize_t authorized_show(struct device *dev,
708 struct device_attribute *attr, char *buf)
709{
710 struct usb_device *usb_dev = to_usb_device(dev);
711 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
712}
713
714/*
715 * Authorize a device to be used in the system
716 *
717 * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
718 */
719static ssize_t authorized_store(struct device *dev,
720 struct device_attribute *attr, const char *buf,
721 size_t size)
722{
723 ssize_t result;
724 struct usb_device *usb_dev = to_usb_device(dev);
725 unsigned val;
726 result = sscanf(buf, "%u\n", &val);
727 if (result != 1)
728 result = -EINVAL;
729 else if (val == 0)
730 result = usb_deauthorize_device(usb_dev);
731 else
732 result = usb_authorize_device(usb_dev);
733 return result < 0 ? result : size;
734}
735static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, S_IRUGO | S_IWUSR,
736 authorized_show, authorized_store);
737
738/* "Safely remove a device" */
739static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
740 const char *buf, size_t count)
741{
742 struct usb_device *udev = to_usb_device(dev);
743 int rc = 0;
744
745 usb_lock_device(udev);
746 if (udev->state != USB_STATE_NOTATTACHED) {
747
748 /* To avoid races, first unconfigure and then remove */
749 usb_set_configuration(udev, -1);
750 rc = usb_remove_device(udev);
751 }
752 if (rc == 0)
753 rc = count;
754 usb_unlock_device(udev);
755 return rc;
756}
757static DEVICE_ATTR_IGNORE_LOCKDEP(remove, S_IWUSR, NULL, remove_store);
758
759
760static 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,
789 NULL,
790};
791static struct attribute_group dev_attr_grp = {
792 .attrs = dev_attrs,
793};
794
795/* When modifying this list, be sure to modify dev_string_attrs_are_visible()
796 * accordingly.
797 */
798static struct attribute *dev_string_attrs[] = {
799 &dev_attr_manufacturer.attr,
800 &dev_attr_product.attr,
801 &dev_attr_serial.attr,
802 NULL
803};
804
805static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
806 struct attribute *a, int n)
807{
808 struct device *dev = container_of(kobj, struct device, kobj);
809 struct usb_device *udev = to_usb_device(dev);
810
811 if (a == &dev_attr_manufacturer.attr) {
812 if (udev->manufacturer == NULL)
813 return 0;
814 } else if (a == &dev_attr_product.attr) {
815 if (udev->product == NULL)
816 return 0;
817 } else if (a == &dev_attr_serial.attr) {
818 if (udev->serial == NULL)
819 return 0;
820 }
821 return a->mode;
822}
823
824static struct attribute_group dev_string_attr_grp = {
825 .attrs = dev_string_attrs,
826 .is_visible = dev_string_attrs_are_visible,
827};
828
829const struct attribute_group *usb_device_groups[] = {
830 &dev_attr_grp,
831 &dev_string_attr_grp,
832 NULL
833};
834
835/* Binary descriptors */
836
837static ssize_t
838read_descriptors(struct file *filp, struct kobject *kobj,
839 struct bin_attribute *attr,
840 char *buf, loff_t off, size_t count)
841{
842 struct device *dev = container_of(kobj, struct device, kobj);
843 struct usb_device *udev = to_usb_device(dev);
844 size_t nleft = count;
845 size_t srclen, n;
846 int cfgno;
847 void *src;
848
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).
852 */
853 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
854 nleft > 0; ++cfgno) {
855 if (cfgno < 0) {
856 src = &udev->descriptor;
857 srclen = sizeof(struct usb_device_descriptor);
858 } else {
859 src = udev->rawdescriptors[cfgno];
860 srclen = __le16_to_cpu(udev->config[cfgno].desc.
861 wTotalLength);
862 }
863 if (off < srclen) {
864 n = min(nleft, srclen - (size_t) off);
865 memcpy(buf, src + off, n);
866 nleft -= n;
867 buf += n;
868 off = 0;
869 } else {
870 off -= srclen;
871 }
872 }
873 return count - nleft;
874}
875
876static 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 */
880};
881
882int usb_create_sysfs_dev_files(struct usb_device *udev)
883{
884 struct device *dev = &udev->dev;
885 int retval;
886
887 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
888 if (retval)
889 goto error;
890
891 retval = add_persist_attributes(dev);
892 if (retval)
893 goto error;
894
895 retval = add_power_attributes(dev);
896 if (retval)
897 goto error;
898 return retval;
899error:
900 usb_remove_sysfs_dev_files(udev);
901 return retval;
902}
903
904void usb_remove_sysfs_dev_files(struct usb_device *udev)
905{
906 struct device *dev = &udev->dev;
907
908 remove_power_attributes(dev);
909 remove_persist_attributes(dev);
910 device_remove_bin_file(dev, &dev_bin_attr_descriptors);
911}
912
913/* Interface Association Descriptor fields */
914#define usb_intf_assoc_attr(field, format_string) \
915static ssize_t \
916iad_##field##_show(struct device *dev, struct device_attribute *attr, \
917 char *buf) \
918{ \
919 struct usb_interface *intf = to_usb_interface(dev); \
920 \
921 return sprintf(buf, format_string, \
922 intf->intf_assoc->field); \
923} \
924static DEVICE_ATTR_RO(iad_##field)
925
926usb_intf_assoc_attr(bFirstInterface, "%02x\n");
927usb_intf_assoc_attr(bInterfaceCount, "%02d\n");
928usb_intf_assoc_attr(bFunctionClass, "%02x\n");
929usb_intf_assoc_attr(bFunctionSubClass, "%02x\n");
930usb_intf_assoc_attr(bFunctionProtocol, "%02x\n");
931
932/* Interface fields */
933#define usb_intf_attr(field, format_string) \
934static ssize_t \
935field##_show(struct device *dev, struct device_attribute *attr, \
936 char *buf) \
937{ \
938 struct usb_interface *intf = to_usb_interface(dev); \
939 \
940 return sprintf(buf, format_string, \
941 intf->cur_altsetting->desc.field); \
942} \
943static DEVICE_ATTR_RO(field)
944
945usb_intf_attr(bInterfaceNumber, "%02x\n");
946usb_intf_attr(bAlternateSetting, "%2d\n");
947usb_intf_attr(bNumEndpoints, "%02x\n");
948usb_intf_attr(bInterfaceClass, "%02x\n");
949usb_intf_attr(bInterfaceSubClass, "%02x\n");
950usb_intf_attr(bInterfaceProtocol, "%02x\n");
951
952static ssize_t interface_show(struct device *dev, struct device_attribute *attr,
953 char *buf)
954{
955 struct usb_interface *intf;
956 char *string;
957
958 intf = to_usb_interface(dev);
959 string = ACCESS_ONCE(intf->cur_altsetting->string);
960 if (!string)
961 return 0;
962 return sprintf(buf, "%s\n", string);
963}
964static DEVICE_ATTR_RO(interface);
965
966static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
967 char *buf)
968{
969 struct usb_interface *intf;
970 struct usb_device *udev;
971 struct usb_host_interface *alt;
972
973 intf = to_usb_interface(dev);
974 udev = interface_to_usbdev(intf);
975 alt = ACCESS_ONCE(intf->cur_altsetting);
976
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);
989}
990static DEVICE_ATTR_RO(modalias);
991
992static ssize_t supports_autosuspend_show(struct device *dev,
993 struct device_attribute *attr,
994 char *buf)
995{
996 int s;
997
998 s = device_lock_interruptible(dev);
999 if (s < 0)
1000 return -EINTR;
1001 /* Devices will be autosuspended even when an interface isn't claimed */
1002 s = (!dev->driver || to_usb_driver(dev->driver)->supports_autosuspend);
1003 device_unlock(dev);
1004
1005 return sprintf(buf, "%u\n", s);
1006}
1007static DEVICE_ATTR_RO(supports_autosuspend);
1008
1009/*
1010 * interface_authorized_show - show authorization status of an USB interface
1011 * 1 is authorized, 0 is deauthorized
1012 */
1013static ssize_t interface_authorized_show(struct device *dev,
1014 struct device_attribute *attr, char *buf)
1015{
1016 struct usb_interface *intf = to_usb_interface(dev);
1017
1018 return sprintf(buf, "%u\n", intf->authorized);
1019}
1020
1021/*
1022 * interface_authorized_store - authorize or deauthorize an USB interface
1023 */
1024static ssize_t interface_authorized_store(struct device *dev,
1025 struct device_attribute *attr, const char *buf, size_t count)
1026{
1027 struct usb_interface *intf = to_usb_interface(dev);
1028 bool val;
1029
1030 if (strtobool(buf, &val) != 0)
1031 return -EINVAL;
1032
1033 if (val)
1034 usb_authorize_interface(intf);
1035 else
1036 usb_deauthorize_interface(intf);
1037
1038 return count;
1039}
1040static struct device_attribute dev_attr_interface_authorized =
1041 __ATTR(authorized, S_IRUGO | S_IWUSR,
1042 interface_authorized_show, interface_authorized_store);
1043
1044static 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,
1054 NULL,
1055};
1056static struct attribute_group intf_attr_grp = {
1057 .attrs = intf_attrs,
1058};
1059
1060static 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,
1066 NULL,
1067};
1068
1069static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
1070 struct attribute *a, int n)
1071{
1072 struct device *dev = container_of(kobj, struct device, kobj);
1073 struct usb_interface *intf = to_usb_interface(dev);
1074
1075 if (intf->intf_assoc == NULL)
1076 return 0;
1077 return a->mode;
1078}
1079
1080static struct attribute_group intf_assoc_attr_grp = {
1081 .attrs = intf_assoc_attrs,
1082 .is_visible = intf_assoc_attrs_are_visible,
1083};
1084
1085const struct attribute_group *usb_interface_groups[] = {
1086 &intf_attr_grp,
1087 &intf_assoc_attr_grp,
1088 NULL
1089};
1090
1091void usb_create_sysfs_intf_files(struct usb_interface *intf)
1092{
1093 struct usb_device *udev = interface_to_usbdev(intf);
1094 struct usb_host_interface *alt = intf->cur_altsetting;
1095
1096 if (intf->sysfs_files_created || intf->unregistering)
1097 return;
1098
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;
1104}
1105
1106void usb_remove_sysfs_intf_files(struct usb_interface *intf)
1107{
1108 if (!intf->sysfs_files_created)
1109 return;
1110
1111 device_remove_file(&intf->dev, &dev_attr_interface);
1112 intf->sysfs_files_created = 0;
1113}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * drivers/usb/core/sysfs.c
4 *
5 * (C) Copyright 2002 David Brownell
6 * (C) Copyright 2002,2004 Greg Kroah-Hartman
7 * (C) Copyright 2002,2004 IBM Corp.
8 *
9 * All of the sysfs file attributes for usb devices and interfaces.
10 *
11 * Released under the GPLv2 only.
12 */
13
14
15#include <linux/kernel.h>
16#include <linux/kstrtox.h>
17#include <linux/string.h>
18#include <linux/usb.h>
19#include <linux/usb/hcd.h>
20#include <linux/usb/quirks.h>
21#include <linux/of.h>
22#include "usb.h"
23
24/* Active configuration fields */
25#define usb_actconfig_show(field, format_string) \
26static ssize_t field##_show(struct device *dev, \
27 struct device_attribute *attr, char *buf) \
28{ \
29 struct usb_device *udev; \
30 struct usb_host_config *actconfig; \
31 ssize_t rc; \
32 \
33 udev = to_usb_device(dev); \
34 rc = usb_lock_device_interruptible(udev); \
35 if (rc < 0) \
36 return -EINTR; \
37 actconfig = udev->actconfig; \
38 if (actconfig) \
39 rc = sysfs_emit(buf, format_string, \
40 actconfig->desc.field); \
41 usb_unlock_device(udev); \
42 return rc; \
43} \
44
45#define usb_actconfig_attr(field, format_string) \
46 usb_actconfig_show(field, format_string) \
47 static DEVICE_ATTR_RO(field)
48
49usb_actconfig_attr(bNumInterfaces, "%2d\n");
50usb_actconfig_attr(bmAttributes, "%2x\n");
51
52static ssize_t bMaxPower_show(struct device *dev,
53 struct device_attribute *attr, char *buf)
54{
55 struct usb_device *udev;
56 struct usb_host_config *actconfig;
57 ssize_t rc;
58
59 udev = to_usb_device(dev);
60 rc = usb_lock_device_interruptible(udev);
61 if (rc < 0)
62 return -EINTR;
63 actconfig = udev->actconfig;
64 if (actconfig)
65 rc = sysfs_emit(buf, "%dmA\n", usb_get_max_power(udev, actconfig));
66 usb_unlock_device(udev);
67 return rc;
68}
69static DEVICE_ATTR_RO(bMaxPower);
70
71static ssize_t configuration_show(struct device *dev,
72 struct device_attribute *attr, char *buf)
73{
74 struct usb_device *udev;
75 struct usb_host_config *actconfig;
76 ssize_t rc;
77
78 udev = to_usb_device(dev);
79 rc = usb_lock_device_interruptible(udev);
80 if (rc < 0)
81 return -EINTR;
82 actconfig = udev->actconfig;
83 if (actconfig && actconfig->string)
84 rc = sysfs_emit(buf, "%s\n", actconfig->string);
85 usb_unlock_device(udev);
86 return rc;
87}
88static DEVICE_ATTR_RO(configuration);
89
90/* configuration value is always present, and r/w */
91usb_actconfig_show(bConfigurationValue, "%u\n");
92
93static ssize_t bConfigurationValue_store(struct device *dev,
94 struct device_attribute *attr,
95 const char *buf, size_t count)
96{
97 struct usb_device *udev = to_usb_device(dev);
98 int config, value, rc;
99
100 if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
101 return -EINVAL;
102 rc = usb_lock_device_interruptible(udev);
103 if (rc < 0)
104 return -EINTR;
105 value = usb_set_configuration(udev, config);
106 usb_unlock_device(udev);
107 return (value < 0) ? value : count;
108}
109static DEVICE_ATTR_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,
110 bConfigurationValue_show, bConfigurationValue_store);
111
112#ifdef CONFIG_OF
113static ssize_t devspec_show(struct device *dev, struct device_attribute *attr,
114 char *buf)
115{
116 struct device_node *of_node = dev->of_node;
117
118 return sysfs_emit(buf, "%pOF\n", of_node);
119}
120static DEVICE_ATTR_RO(devspec);
121#endif
122
123/* String fields */
124#define usb_string_attr(name) \
125static ssize_t name##_show(struct device *dev, \
126 struct device_attribute *attr, char *buf) \
127{ \
128 struct usb_device *udev; \
129 int retval; \
130 \
131 udev = to_usb_device(dev); \
132 retval = usb_lock_device_interruptible(udev); \
133 if (retval < 0) \
134 return -EINTR; \
135 retval = sysfs_emit(buf, "%s\n", udev->name); \
136 usb_unlock_device(udev); \
137 return retval; \
138} \
139static DEVICE_ATTR_RO(name)
140
141usb_string_attr(product);
142usb_string_attr(manufacturer);
143usb_string_attr(serial);
144
145static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
146 char *buf)
147{
148 struct usb_device *udev;
149 char *speed;
150
151 udev = to_usb_device(dev);
152
153 switch (udev->speed) {
154 case USB_SPEED_LOW:
155 speed = "1.5";
156 break;
157 case USB_SPEED_UNKNOWN:
158 case USB_SPEED_FULL:
159 speed = "12";
160 break;
161 case USB_SPEED_HIGH:
162 speed = "480";
163 break;
164 case USB_SPEED_WIRELESS:
165 speed = "480";
166 break;
167 case USB_SPEED_SUPER:
168 speed = "5000";
169 break;
170 case USB_SPEED_SUPER_PLUS:
171 if (udev->ssp_rate == USB_SSP_GEN_2x2)
172 speed = "20000";
173 else
174 speed = "10000";
175 break;
176 default:
177 speed = "unknown";
178 }
179 return sysfs_emit(buf, "%s\n", speed);
180}
181static DEVICE_ATTR_RO(speed);
182
183static ssize_t rx_lanes_show(struct device *dev, struct device_attribute *attr,
184 char *buf)
185{
186 struct usb_device *udev;
187
188 udev = to_usb_device(dev);
189 return sysfs_emit(buf, "%d\n", udev->rx_lanes);
190}
191static DEVICE_ATTR_RO(rx_lanes);
192
193static ssize_t tx_lanes_show(struct device *dev, struct device_attribute *attr,
194 char *buf)
195{
196 struct usb_device *udev;
197
198 udev = to_usb_device(dev);
199 return sysfs_emit(buf, "%d\n", udev->tx_lanes);
200}
201static DEVICE_ATTR_RO(tx_lanes);
202
203static ssize_t busnum_show(struct device *dev, struct device_attribute *attr,
204 char *buf)
205{
206 struct usb_device *udev;
207
208 udev = to_usb_device(dev);
209 return sysfs_emit(buf, "%d\n", udev->bus->busnum);
210}
211static DEVICE_ATTR_RO(busnum);
212
213static ssize_t devnum_show(struct device *dev, struct device_attribute *attr,
214 char *buf)
215{
216 struct usb_device *udev;
217
218 udev = to_usb_device(dev);
219 return sysfs_emit(buf, "%d\n", udev->devnum);
220}
221static DEVICE_ATTR_RO(devnum);
222
223static ssize_t devpath_show(struct device *dev, struct device_attribute *attr,
224 char *buf)
225{
226 struct usb_device *udev;
227
228 udev = to_usb_device(dev);
229 return sysfs_emit(buf, "%s\n", udev->devpath);
230}
231static DEVICE_ATTR_RO(devpath);
232
233static ssize_t version_show(struct device *dev, struct device_attribute *attr,
234 char *buf)
235{
236 struct usb_device *udev;
237 u16 bcdUSB;
238
239 udev = to_usb_device(dev);
240 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
241 return sysfs_emit(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
242}
243static DEVICE_ATTR_RO(version);
244
245static ssize_t maxchild_show(struct device *dev, struct device_attribute *attr,
246 char *buf)
247{
248 struct usb_device *udev;
249
250 udev = to_usb_device(dev);
251 return sysfs_emit(buf, "%d\n", udev->maxchild);
252}
253static DEVICE_ATTR_RO(maxchild);
254
255static ssize_t quirks_show(struct device *dev, struct device_attribute *attr,
256 char *buf)
257{
258 struct usb_device *udev;
259
260 udev = to_usb_device(dev);
261 return sysfs_emit(buf, "0x%x\n", udev->quirks);
262}
263static DEVICE_ATTR_RO(quirks);
264
265static ssize_t avoid_reset_quirk_show(struct device *dev,
266 struct device_attribute *attr, char *buf)
267{
268 struct usb_device *udev;
269
270 udev = to_usb_device(dev);
271 return sysfs_emit(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET));
272}
273
274static ssize_t avoid_reset_quirk_store(struct device *dev,
275 struct device_attribute *attr,
276 const char *buf, size_t count)
277{
278 struct usb_device *udev = to_usb_device(dev);
279 int val, rc;
280
281 if (sscanf(buf, "%d", &val) != 1 || val < 0 || val > 1)
282 return -EINVAL;
283 rc = usb_lock_device_interruptible(udev);
284 if (rc < 0)
285 return -EINTR;
286 if (val)
287 udev->quirks |= USB_QUIRK_RESET;
288 else
289 udev->quirks &= ~USB_QUIRK_RESET;
290 usb_unlock_device(udev);
291 return count;
292}
293static DEVICE_ATTR_RW(avoid_reset_quirk);
294
295static ssize_t urbnum_show(struct device *dev, struct device_attribute *attr,
296 char *buf)
297{
298 struct usb_device *udev;
299
300 udev = to_usb_device(dev);
301 return sysfs_emit(buf, "%d\n", atomic_read(&udev->urbnum));
302}
303static DEVICE_ATTR_RO(urbnum);
304
305static ssize_t ltm_capable_show(struct device *dev,
306 struct device_attribute *attr, char *buf)
307{
308 if (usb_device_supports_ltm(to_usb_device(dev)))
309 return sysfs_emit(buf, "%s\n", "yes");
310 return sysfs_emit(buf, "%s\n", "no");
311}
312static DEVICE_ATTR_RO(ltm_capable);
313
314#ifdef CONFIG_PM
315
316static ssize_t persist_show(struct device *dev, struct device_attribute *attr,
317 char *buf)
318{
319 struct usb_device *udev = to_usb_device(dev);
320
321 return sysfs_emit(buf, "%d\n", udev->persist_enabled);
322}
323
324static ssize_t persist_store(struct device *dev, struct device_attribute *attr,
325 const char *buf, size_t count)
326{
327 struct usb_device *udev = to_usb_device(dev);
328 int value, rc;
329
330 /* Hubs are always enabled for USB_PERSIST */
331 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
332 return -EPERM;
333
334 if (sscanf(buf, "%d", &value) != 1)
335 return -EINVAL;
336
337 rc = usb_lock_device_interruptible(udev);
338 if (rc < 0)
339 return -EINTR;
340 udev->persist_enabled = !!value;
341 usb_unlock_device(udev);
342 return count;
343}
344static DEVICE_ATTR_RW(persist);
345
346static int add_persist_attributes(struct device *dev)
347{
348 int rc = 0;
349
350 if (is_usb_device(dev)) {
351 struct usb_device *udev = to_usb_device(dev);
352
353 /* Hubs are automatically enabled for USB_PERSIST,
354 * no point in creating the attribute file.
355 */
356 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
357 rc = sysfs_add_file_to_group(&dev->kobj,
358 &dev_attr_persist.attr,
359 power_group_name);
360 }
361 return rc;
362}
363
364static void remove_persist_attributes(struct device *dev)
365{
366 sysfs_remove_file_from_group(&dev->kobj,
367 &dev_attr_persist.attr,
368 power_group_name);
369}
370
371static ssize_t connected_duration_show(struct device *dev,
372 struct device_attribute *attr, char *buf)
373{
374 struct usb_device *udev = to_usb_device(dev);
375
376 return sysfs_emit(buf, "%u\n",
377 jiffies_to_msecs(jiffies - udev->connect_time));
378}
379static DEVICE_ATTR_RO(connected_duration);
380
381/*
382 * If the device is resumed, the last time the device was suspended has
383 * been pre-subtracted from active_duration. We add the current time to
384 * get the duration that the device was actually active.
385 *
386 * If the device is suspended, the active_duration is up-to-date.
387 */
388static ssize_t active_duration_show(struct device *dev,
389 struct device_attribute *attr, char *buf)
390{
391 struct usb_device *udev = to_usb_device(dev);
392 int duration;
393
394 if (udev->state != USB_STATE_SUSPENDED)
395 duration = jiffies_to_msecs(jiffies + udev->active_duration);
396 else
397 duration = jiffies_to_msecs(udev->active_duration);
398 return sysfs_emit(buf, "%u\n", duration);
399}
400static DEVICE_ATTR_RO(active_duration);
401
402static ssize_t autosuspend_show(struct device *dev,
403 struct device_attribute *attr, char *buf)
404{
405 return sysfs_emit(buf, "%d\n", dev->power.autosuspend_delay / 1000);
406}
407
408static ssize_t autosuspend_store(struct device *dev,
409 struct device_attribute *attr, const char *buf,
410 size_t count)
411{
412 int value;
413
414 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
415 value <= -INT_MAX/1000)
416 return -EINVAL;
417
418 pm_runtime_set_autosuspend_delay(dev, value * 1000);
419 return count;
420}
421static DEVICE_ATTR_RW(autosuspend);
422
423static const char on_string[] = "on";
424static const char auto_string[] = "auto";
425
426static void warn_level(void)
427{
428 static int level_warned;
429
430 if (!level_warned) {
431 level_warned = 1;
432 printk(KERN_WARNING "WARNING! power/level is deprecated; "
433 "use power/control instead\n");
434 }
435}
436
437static ssize_t level_show(struct device *dev, struct device_attribute *attr,
438 char *buf)
439{
440 struct usb_device *udev = to_usb_device(dev);
441 const char *p = auto_string;
442
443 warn_level();
444 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
445 p = on_string;
446 return sysfs_emit(buf, "%s\n", p);
447}
448
449static ssize_t level_store(struct device *dev, struct device_attribute *attr,
450 const char *buf, size_t count)
451{
452 struct usb_device *udev = to_usb_device(dev);
453 int len = count;
454 char *cp;
455 int rc = count;
456 int rv;
457
458 warn_level();
459 cp = memchr(buf, '\n', count);
460 if (cp)
461 len = cp - buf;
462
463 rv = usb_lock_device_interruptible(udev);
464 if (rv < 0)
465 return -EINTR;
466
467 if (len == sizeof on_string - 1 &&
468 strncmp(buf, on_string, len) == 0)
469 usb_disable_autosuspend(udev);
470
471 else if (len == sizeof auto_string - 1 &&
472 strncmp(buf, auto_string, len) == 0)
473 usb_enable_autosuspend(udev);
474
475 else
476 rc = -EINVAL;
477
478 usb_unlock_device(udev);
479 return rc;
480}
481static DEVICE_ATTR_RW(level);
482
483static ssize_t usb2_hardware_lpm_show(struct device *dev,
484 struct device_attribute *attr, char *buf)
485{
486 struct usb_device *udev = to_usb_device(dev);
487 const char *p;
488
489 if (udev->usb2_hw_lpm_allowed == 1)
490 p = "enabled";
491 else
492 p = "disabled";
493
494 return sysfs_emit(buf, "%s\n", p);
495}
496
497static ssize_t usb2_hardware_lpm_store(struct device *dev,
498 struct device_attribute *attr,
499 const char *buf, size_t count)
500{
501 struct usb_device *udev = to_usb_device(dev);
502 bool value;
503 int ret;
504
505 ret = usb_lock_device_interruptible(udev);
506 if (ret < 0)
507 return -EINTR;
508
509 ret = kstrtobool(buf, &value);
510
511 if (!ret) {
512 udev->usb2_hw_lpm_allowed = value;
513 if (value)
514 ret = usb_enable_usb2_hardware_lpm(udev);
515 else
516 ret = usb_disable_usb2_hardware_lpm(udev);
517 }
518
519 usb_unlock_device(udev);
520
521 if (!ret)
522 return count;
523
524 return ret;
525}
526static DEVICE_ATTR_RW(usb2_hardware_lpm);
527
528static ssize_t usb2_lpm_l1_timeout_show(struct device *dev,
529 struct device_attribute *attr,
530 char *buf)
531{
532 struct usb_device *udev = to_usb_device(dev);
533 return sysfs_emit(buf, "%d\n", udev->l1_params.timeout);
534}
535
536static ssize_t usb2_lpm_l1_timeout_store(struct device *dev,
537 struct device_attribute *attr,
538 const char *buf, size_t count)
539{
540 struct usb_device *udev = to_usb_device(dev);
541 u16 timeout;
542
543 if (kstrtou16(buf, 0, &timeout))
544 return -EINVAL;
545
546 udev->l1_params.timeout = timeout;
547
548 return count;
549}
550static DEVICE_ATTR_RW(usb2_lpm_l1_timeout);
551
552static ssize_t usb2_lpm_besl_show(struct device *dev,
553 struct device_attribute *attr, char *buf)
554{
555 struct usb_device *udev = to_usb_device(dev);
556 return sysfs_emit(buf, "%d\n", udev->l1_params.besl);
557}
558
559static ssize_t usb2_lpm_besl_store(struct device *dev,
560 struct device_attribute *attr,
561 const char *buf, size_t count)
562{
563 struct usb_device *udev = to_usb_device(dev);
564 u8 besl;
565
566 if (kstrtou8(buf, 0, &besl) || besl > 15)
567 return -EINVAL;
568
569 udev->l1_params.besl = besl;
570
571 return count;
572}
573static DEVICE_ATTR_RW(usb2_lpm_besl);
574
575static ssize_t usb3_hardware_lpm_u1_show(struct device *dev,
576 struct device_attribute *attr, char *buf)
577{
578 struct usb_device *udev = to_usb_device(dev);
579 const char *p;
580 int rc;
581
582 rc = usb_lock_device_interruptible(udev);
583 if (rc < 0)
584 return -EINTR;
585
586 if (udev->usb3_lpm_u1_enabled)
587 p = "enabled";
588 else
589 p = "disabled";
590
591 usb_unlock_device(udev);
592
593 return sysfs_emit(buf, "%s\n", p);
594}
595static DEVICE_ATTR_RO(usb3_hardware_lpm_u1);
596
597static ssize_t usb3_hardware_lpm_u2_show(struct device *dev,
598 struct device_attribute *attr, char *buf)
599{
600 struct usb_device *udev = to_usb_device(dev);
601 const char *p;
602 int rc;
603
604 rc = usb_lock_device_interruptible(udev);
605 if (rc < 0)
606 return -EINTR;
607
608 if (udev->usb3_lpm_u2_enabled)
609 p = "enabled";
610 else
611 p = "disabled";
612
613 usb_unlock_device(udev);
614
615 return sysfs_emit(buf, "%s\n", p);
616}
617static DEVICE_ATTR_RO(usb3_hardware_lpm_u2);
618
619static struct attribute *usb2_hardware_lpm_attr[] = {
620 &dev_attr_usb2_hardware_lpm.attr,
621 &dev_attr_usb2_lpm_l1_timeout.attr,
622 &dev_attr_usb2_lpm_besl.attr,
623 NULL,
624};
625static const struct attribute_group usb2_hardware_lpm_attr_group = {
626 .name = power_group_name,
627 .attrs = usb2_hardware_lpm_attr,
628};
629
630static struct attribute *usb3_hardware_lpm_attr[] = {
631 &dev_attr_usb3_hardware_lpm_u1.attr,
632 &dev_attr_usb3_hardware_lpm_u2.attr,
633 NULL,
634};
635static const struct attribute_group usb3_hardware_lpm_attr_group = {
636 .name = power_group_name,
637 .attrs = usb3_hardware_lpm_attr,
638};
639
640static struct attribute *power_attrs[] = {
641 &dev_attr_autosuspend.attr,
642 &dev_attr_level.attr,
643 &dev_attr_connected_duration.attr,
644 &dev_attr_active_duration.attr,
645 NULL,
646};
647static const struct attribute_group power_attr_group = {
648 .name = power_group_name,
649 .attrs = power_attrs,
650};
651
652static int add_power_attributes(struct device *dev)
653{
654 int rc = 0;
655
656 if (is_usb_device(dev)) {
657 struct usb_device *udev = to_usb_device(dev);
658 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
659 if (udev->usb2_hw_lpm_capable == 1)
660 rc = sysfs_merge_group(&dev->kobj,
661 &usb2_hardware_lpm_attr_group);
662 if ((udev->speed == USB_SPEED_SUPER ||
663 udev->speed == USB_SPEED_SUPER_PLUS) &&
664 udev->lpm_capable == 1)
665 rc = sysfs_merge_group(&dev->kobj,
666 &usb3_hardware_lpm_attr_group);
667 }
668
669 return rc;
670}
671
672static void remove_power_attributes(struct device *dev)
673{
674 sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
675 sysfs_unmerge_group(&dev->kobj, &power_attr_group);
676}
677
678#else
679
680#define add_persist_attributes(dev) 0
681#define remove_persist_attributes(dev) do {} while (0)
682
683#define add_power_attributes(dev) 0
684#define remove_power_attributes(dev) do {} while (0)
685
686#endif /* CONFIG_PM */
687
688
689/* Descriptor fields */
690#define usb_descriptor_attr_le16(field, format_string) \
691static ssize_t \
692field##_show(struct device *dev, struct device_attribute *attr, \
693 char *buf) \
694{ \
695 struct usb_device *udev; \
696 \
697 udev = to_usb_device(dev); \
698 return sysfs_emit(buf, format_string, \
699 le16_to_cpu(udev->descriptor.field)); \
700} \
701static DEVICE_ATTR_RO(field)
702
703usb_descriptor_attr_le16(idVendor, "%04x\n");
704usb_descriptor_attr_le16(idProduct, "%04x\n");
705usb_descriptor_attr_le16(bcdDevice, "%04x\n");
706
707#define usb_descriptor_attr(field, format_string) \
708static ssize_t \
709field##_show(struct device *dev, struct device_attribute *attr, \
710 char *buf) \
711{ \
712 struct usb_device *udev; \
713 \
714 udev = to_usb_device(dev); \
715 return sysfs_emit(buf, format_string, udev->descriptor.field); \
716} \
717static DEVICE_ATTR_RO(field)
718
719usb_descriptor_attr(bDeviceClass, "%02x\n");
720usb_descriptor_attr(bDeviceSubClass, "%02x\n");
721usb_descriptor_attr(bDeviceProtocol, "%02x\n");
722usb_descriptor_attr(bNumConfigurations, "%d\n");
723usb_descriptor_attr(bMaxPacketSize0, "%d\n");
724
725
726/* show if the device is authorized (1) or not (0) */
727static ssize_t authorized_show(struct device *dev,
728 struct device_attribute *attr, char *buf)
729{
730 struct usb_device *usb_dev = to_usb_device(dev);
731 return sysfs_emit(buf, "%u\n", usb_dev->authorized);
732}
733
734/*
735 * Authorize a device to be used in the system
736 *
737 * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
738 */
739static ssize_t authorized_store(struct device *dev,
740 struct device_attribute *attr, const char *buf,
741 size_t size)
742{
743 ssize_t result;
744 struct usb_device *usb_dev = to_usb_device(dev);
745 unsigned val;
746 result = sscanf(buf, "%u\n", &val);
747 if (result != 1)
748 result = -EINVAL;
749 else if (val == 0)
750 result = usb_deauthorize_device(usb_dev);
751 else
752 result = usb_authorize_device(usb_dev);
753 return result < 0 ? result : size;
754}
755static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, S_IRUGO | S_IWUSR,
756 authorized_show, authorized_store);
757
758/* "Safely remove a device" */
759static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
760 const char *buf, size_t count)
761{
762 struct usb_device *udev = to_usb_device(dev);
763 int rc = 0;
764
765 usb_lock_device(udev);
766 if (udev->state != USB_STATE_NOTATTACHED) {
767
768 /* To avoid races, first unconfigure and then remove */
769 usb_set_configuration(udev, -1);
770 rc = usb_remove_device(udev);
771 }
772 if (rc == 0)
773 rc = count;
774 usb_unlock_device(udev);
775 return rc;
776}
777static DEVICE_ATTR_IGNORE_LOCKDEP(remove, S_IWUSR, NULL, remove_store);
778
779
780static struct attribute *dev_attrs[] = {
781 /* current configuration's attributes */
782 &dev_attr_configuration.attr,
783 &dev_attr_bNumInterfaces.attr,
784 &dev_attr_bConfigurationValue.attr,
785 &dev_attr_bmAttributes.attr,
786 &dev_attr_bMaxPower.attr,
787 /* device attributes */
788 &dev_attr_urbnum.attr,
789 &dev_attr_idVendor.attr,
790 &dev_attr_idProduct.attr,
791 &dev_attr_bcdDevice.attr,
792 &dev_attr_bDeviceClass.attr,
793 &dev_attr_bDeviceSubClass.attr,
794 &dev_attr_bDeviceProtocol.attr,
795 &dev_attr_bNumConfigurations.attr,
796 &dev_attr_bMaxPacketSize0.attr,
797 &dev_attr_speed.attr,
798 &dev_attr_rx_lanes.attr,
799 &dev_attr_tx_lanes.attr,
800 &dev_attr_busnum.attr,
801 &dev_attr_devnum.attr,
802 &dev_attr_devpath.attr,
803 &dev_attr_version.attr,
804 &dev_attr_maxchild.attr,
805 &dev_attr_quirks.attr,
806 &dev_attr_avoid_reset_quirk.attr,
807 &dev_attr_authorized.attr,
808 &dev_attr_remove.attr,
809 &dev_attr_ltm_capable.attr,
810#ifdef CONFIG_OF
811 &dev_attr_devspec.attr,
812#endif
813 NULL,
814};
815static const struct attribute_group dev_attr_grp = {
816 .attrs = dev_attrs,
817};
818
819/* When modifying this list, be sure to modify dev_string_attrs_are_visible()
820 * accordingly.
821 */
822static struct attribute *dev_string_attrs[] = {
823 &dev_attr_manufacturer.attr,
824 &dev_attr_product.attr,
825 &dev_attr_serial.attr,
826 NULL
827};
828
829static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
830 struct attribute *a, int n)
831{
832 struct device *dev = kobj_to_dev(kobj);
833 struct usb_device *udev = to_usb_device(dev);
834
835 if (a == &dev_attr_manufacturer.attr) {
836 if (udev->manufacturer == NULL)
837 return 0;
838 } else if (a == &dev_attr_product.attr) {
839 if (udev->product == NULL)
840 return 0;
841 } else if (a == &dev_attr_serial.attr) {
842 if (udev->serial == NULL)
843 return 0;
844 }
845 return a->mode;
846}
847
848static const struct attribute_group dev_string_attr_grp = {
849 .attrs = dev_string_attrs,
850 .is_visible = dev_string_attrs_are_visible,
851};
852
853const struct attribute_group *usb_device_groups[] = {
854 &dev_attr_grp,
855 &dev_string_attr_grp,
856 NULL
857};
858
859/* Binary descriptors */
860
861static ssize_t
862read_descriptors(struct file *filp, struct kobject *kobj,
863 struct bin_attribute *attr,
864 char *buf, loff_t off, size_t count)
865{
866 struct device *dev = kobj_to_dev(kobj);
867 struct usb_device *udev = to_usb_device(dev);
868 size_t nleft = count;
869 size_t srclen, n;
870 int cfgno;
871 void *src;
872 int retval;
873
874 retval = usb_lock_device_interruptible(udev);
875 if (retval < 0)
876 return -EINTR;
877 /* The binary attribute begins with the device descriptor.
878 * Following that are the raw descriptor entries for all the
879 * configurations (config plus subsidiary descriptors).
880 */
881 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
882 nleft > 0; ++cfgno) {
883 if (cfgno < 0) {
884 src = &udev->descriptor;
885 srclen = sizeof(struct usb_device_descriptor);
886 } else {
887 src = udev->rawdescriptors[cfgno];
888 srclen = __le16_to_cpu(udev->config[cfgno].desc.
889 wTotalLength);
890 }
891 if (off < srclen) {
892 n = min(nleft, srclen - (size_t) off);
893 memcpy(buf, src + off, n);
894 nleft -= n;
895 buf += n;
896 off = 0;
897 } else {
898 off -= srclen;
899 }
900 }
901 usb_unlock_device(udev);
902 return count - nleft;
903}
904
905static struct bin_attribute dev_bin_attr_descriptors = {
906 .attr = {.name = "descriptors", .mode = 0444},
907 .read = read_descriptors,
908 .size = 18 + 65535, /* dev descr + max-size raw descriptor */
909};
910
911/*
912 * Show & store the current value of authorized_default
913 */
914static ssize_t authorized_default_show(struct device *dev,
915 struct device_attribute *attr, char *buf)
916{
917 struct usb_device *rh_usb_dev = to_usb_device(dev);
918 struct usb_bus *usb_bus = rh_usb_dev->bus;
919 struct usb_hcd *hcd;
920
921 hcd = bus_to_hcd(usb_bus);
922 return sysfs_emit(buf, "%u\n", hcd->dev_policy);
923}
924
925static ssize_t authorized_default_store(struct device *dev,
926 struct device_attribute *attr,
927 const char *buf, size_t size)
928{
929 ssize_t result;
930 unsigned int val;
931 struct usb_device *rh_usb_dev = to_usb_device(dev);
932 struct usb_bus *usb_bus = rh_usb_dev->bus;
933 struct usb_hcd *hcd;
934
935 hcd = bus_to_hcd(usb_bus);
936 result = sscanf(buf, "%u\n", &val);
937 if (result == 1) {
938 hcd->dev_policy = val <= USB_DEVICE_AUTHORIZE_INTERNAL ?
939 val : USB_DEVICE_AUTHORIZE_ALL;
940 result = size;
941 } else {
942 result = -EINVAL;
943 }
944 return result;
945}
946static DEVICE_ATTR_RW(authorized_default);
947
948/*
949 * interface_authorized_default_show - show default authorization status
950 * for USB interfaces
951 *
952 * note: interface_authorized_default is the default value
953 * for initializing the authorized attribute of interfaces
954 */
955static ssize_t interface_authorized_default_show(struct device *dev,
956 struct device_attribute *attr, char *buf)
957{
958 struct usb_device *usb_dev = to_usb_device(dev);
959 struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
960
961 return sysfs_emit(buf, "%u\n", !!HCD_INTF_AUTHORIZED(hcd));
962}
963
964/*
965 * interface_authorized_default_store - store default authorization status
966 * for USB interfaces
967 *
968 * note: interface_authorized_default is the default value
969 * for initializing the authorized attribute of interfaces
970 */
971static ssize_t interface_authorized_default_store(struct device *dev,
972 struct device_attribute *attr, const char *buf, size_t count)
973{
974 struct usb_device *usb_dev = to_usb_device(dev);
975 struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
976 int rc = count;
977 bool val;
978
979 if (kstrtobool(buf, &val) != 0)
980 return -EINVAL;
981
982 if (val)
983 set_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
984 else
985 clear_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
986
987 return rc;
988}
989static DEVICE_ATTR_RW(interface_authorized_default);
990
991/* Group all the USB bus attributes */
992static struct attribute *usb_bus_attrs[] = {
993 &dev_attr_authorized_default.attr,
994 &dev_attr_interface_authorized_default.attr,
995 NULL,
996};
997
998static const struct attribute_group usb_bus_attr_group = {
999 .name = NULL, /* we want them in the same directory */
1000 .attrs = usb_bus_attrs,
1001};
1002
1003
1004static int add_default_authorized_attributes(struct device *dev)
1005{
1006 int rc = 0;
1007
1008 if (is_usb_device(dev))
1009 rc = sysfs_create_group(&dev->kobj, &usb_bus_attr_group);
1010
1011 return rc;
1012}
1013
1014static void remove_default_authorized_attributes(struct device *dev)
1015{
1016 if (is_usb_device(dev)) {
1017 sysfs_remove_group(&dev->kobj, &usb_bus_attr_group);
1018 }
1019}
1020
1021int usb_create_sysfs_dev_files(struct usb_device *udev)
1022{
1023 struct device *dev = &udev->dev;
1024 int retval;
1025
1026 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
1027 if (retval)
1028 goto error;
1029
1030 retval = add_persist_attributes(dev);
1031 if (retval)
1032 goto error;
1033
1034 retval = add_power_attributes(dev);
1035 if (retval)
1036 goto error;
1037
1038 if (is_root_hub(udev)) {
1039 retval = add_default_authorized_attributes(dev);
1040 if (retval)
1041 goto error;
1042 }
1043 return retval;
1044
1045error:
1046 usb_remove_sysfs_dev_files(udev);
1047 return retval;
1048}
1049
1050void usb_remove_sysfs_dev_files(struct usb_device *udev)
1051{
1052 struct device *dev = &udev->dev;
1053
1054 if (is_root_hub(udev))
1055 remove_default_authorized_attributes(dev);
1056
1057 remove_power_attributes(dev);
1058 remove_persist_attributes(dev);
1059 device_remove_bin_file(dev, &dev_bin_attr_descriptors);
1060}
1061
1062/* Interface Association Descriptor fields */
1063#define usb_intf_assoc_attr(field, format_string) \
1064static ssize_t \
1065iad_##field##_show(struct device *dev, struct device_attribute *attr, \
1066 char *buf) \
1067{ \
1068 struct usb_interface *intf = to_usb_interface(dev); \
1069 \
1070 return sysfs_emit(buf, format_string, \
1071 intf->intf_assoc->field); \
1072} \
1073static DEVICE_ATTR_RO(iad_##field)
1074
1075usb_intf_assoc_attr(bFirstInterface, "%02x\n");
1076usb_intf_assoc_attr(bInterfaceCount, "%02d\n");
1077usb_intf_assoc_attr(bFunctionClass, "%02x\n");
1078usb_intf_assoc_attr(bFunctionSubClass, "%02x\n");
1079usb_intf_assoc_attr(bFunctionProtocol, "%02x\n");
1080
1081/* Interface fields */
1082#define usb_intf_attr(field, format_string) \
1083static ssize_t \
1084field##_show(struct device *dev, struct device_attribute *attr, \
1085 char *buf) \
1086{ \
1087 struct usb_interface *intf = to_usb_interface(dev); \
1088 \
1089 return sysfs_emit(buf, format_string, \
1090 intf->cur_altsetting->desc.field); \
1091} \
1092static DEVICE_ATTR_RO(field)
1093
1094usb_intf_attr(bInterfaceNumber, "%02x\n");
1095usb_intf_attr(bAlternateSetting, "%2d\n");
1096usb_intf_attr(bNumEndpoints, "%02x\n");
1097usb_intf_attr(bInterfaceClass, "%02x\n");
1098usb_intf_attr(bInterfaceSubClass, "%02x\n");
1099usb_intf_attr(bInterfaceProtocol, "%02x\n");
1100
1101static ssize_t interface_show(struct device *dev, struct device_attribute *attr,
1102 char *buf)
1103{
1104 struct usb_interface *intf;
1105 char *string;
1106
1107 intf = to_usb_interface(dev);
1108 string = READ_ONCE(intf->cur_altsetting->string);
1109 if (!string)
1110 return 0;
1111 return sysfs_emit(buf, "%s\n", string);
1112}
1113static DEVICE_ATTR_RO(interface);
1114
1115static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
1116 char *buf)
1117{
1118 struct usb_interface *intf;
1119 struct usb_device *udev;
1120 struct usb_host_interface *alt;
1121
1122 intf = to_usb_interface(dev);
1123 udev = interface_to_usbdev(intf);
1124 alt = READ_ONCE(intf->cur_altsetting);
1125
1126 return sysfs_emit(buf,
1127 "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
1128 "ic%02Xisc%02Xip%02Xin%02X\n",
1129 le16_to_cpu(udev->descriptor.idVendor),
1130 le16_to_cpu(udev->descriptor.idProduct),
1131 le16_to_cpu(udev->descriptor.bcdDevice),
1132 udev->descriptor.bDeviceClass,
1133 udev->descriptor.bDeviceSubClass,
1134 udev->descriptor.bDeviceProtocol,
1135 alt->desc.bInterfaceClass,
1136 alt->desc.bInterfaceSubClass,
1137 alt->desc.bInterfaceProtocol,
1138 alt->desc.bInterfaceNumber);
1139}
1140static DEVICE_ATTR_RO(modalias);
1141
1142static ssize_t supports_autosuspend_show(struct device *dev,
1143 struct device_attribute *attr,
1144 char *buf)
1145{
1146 int s;
1147
1148 s = device_lock_interruptible(dev);
1149 if (s < 0)
1150 return -EINTR;
1151 /* Devices will be autosuspended even when an interface isn't claimed */
1152 s = (!dev->driver || to_usb_driver(dev->driver)->supports_autosuspend);
1153 device_unlock(dev);
1154
1155 return sysfs_emit(buf, "%u\n", s);
1156}
1157static DEVICE_ATTR_RO(supports_autosuspend);
1158
1159/*
1160 * interface_authorized_show - show authorization status of an USB interface
1161 * 1 is authorized, 0 is deauthorized
1162 */
1163static ssize_t interface_authorized_show(struct device *dev,
1164 struct device_attribute *attr, char *buf)
1165{
1166 struct usb_interface *intf = to_usb_interface(dev);
1167
1168 return sysfs_emit(buf, "%u\n", intf->authorized);
1169}
1170
1171/*
1172 * interface_authorized_store - authorize or deauthorize an USB interface
1173 */
1174static ssize_t interface_authorized_store(struct device *dev,
1175 struct device_attribute *attr, const char *buf, size_t count)
1176{
1177 struct usb_interface *intf = to_usb_interface(dev);
1178 bool val;
1179
1180 if (kstrtobool(buf, &val) != 0)
1181 return -EINVAL;
1182
1183 if (val)
1184 usb_authorize_interface(intf);
1185 else
1186 usb_deauthorize_interface(intf);
1187
1188 return count;
1189}
1190static struct device_attribute dev_attr_interface_authorized =
1191 __ATTR(authorized, S_IRUGO | S_IWUSR,
1192 interface_authorized_show, interface_authorized_store);
1193
1194static struct attribute *intf_attrs[] = {
1195 &dev_attr_bInterfaceNumber.attr,
1196 &dev_attr_bAlternateSetting.attr,
1197 &dev_attr_bNumEndpoints.attr,
1198 &dev_attr_bInterfaceClass.attr,
1199 &dev_attr_bInterfaceSubClass.attr,
1200 &dev_attr_bInterfaceProtocol.attr,
1201 &dev_attr_modalias.attr,
1202 &dev_attr_supports_autosuspend.attr,
1203 &dev_attr_interface_authorized.attr,
1204 NULL,
1205};
1206static const struct attribute_group intf_attr_grp = {
1207 .attrs = intf_attrs,
1208};
1209
1210static struct attribute *intf_assoc_attrs[] = {
1211 &dev_attr_iad_bFirstInterface.attr,
1212 &dev_attr_iad_bInterfaceCount.attr,
1213 &dev_attr_iad_bFunctionClass.attr,
1214 &dev_attr_iad_bFunctionSubClass.attr,
1215 &dev_attr_iad_bFunctionProtocol.attr,
1216 NULL,
1217};
1218
1219static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
1220 struct attribute *a, int n)
1221{
1222 struct device *dev = kobj_to_dev(kobj);
1223 struct usb_interface *intf = to_usb_interface(dev);
1224
1225 if (intf->intf_assoc == NULL)
1226 return 0;
1227 return a->mode;
1228}
1229
1230static const struct attribute_group intf_assoc_attr_grp = {
1231 .attrs = intf_assoc_attrs,
1232 .is_visible = intf_assoc_attrs_are_visible,
1233};
1234
1235const struct attribute_group *usb_interface_groups[] = {
1236 &intf_attr_grp,
1237 &intf_assoc_attr_grp,
1238 NULL
1239};
1240
1241void usb_create_sysfs_intf_files(struct usb_interface *intf)
1242{
1243 struct usb_device *udev = interface_to_usbdev(intf);
1244 struct usb_host_interface *alt = intf->cur_altsetting;
1245
1246 if (intf->sysfs_files_created || intf->unregistering)
1247 return;
1248
1249 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
1250 alt->string = usb_cache_string(udev, alt->desc.iInterface);
1251 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface)) {
1252 /* This is not a serious error */
1253 dev_dbg(&intf->dev, "interface string descriptor file not created\n");
1254 }
1255 intf->sysfs_files_created = 1;
1256}
1257
1258void usb_remove_sysfs_intf_files(struct usb_interface *intf)
1259{
1260 if (!intf->sysfs_files_created)
1261 return;
1262
1263 device_remove_file(&intf->dev, &dev_attr_interface);
1264 intf->sysfs_files_created = 0;
1265}