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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_SUPER:
165 speed = "5000";
166 break;
167 case USB_SPEED_SUPER_PLUS:
168 if (udev->ssp_rate == USB_SSP_GEN_2x2)
169 speed = "20000";
170 else
171 speed = "10000";
172 break;
173 default:
174 speed = "unknown";
175 }
176 return sysfs_emit(buf, "%s\n", speed);
177}
178static DEVICE_ATTR_RO(speed);
179
180static ssize_t rx_lanes_show(struct device *dev, struct device_attribute *attr,
181 char *buf)
182{
183 struct usb_device *udev;
184
185 udev = to_usb_device(dev);
186 return sysfs_emit(buf, "%d\n", udev->rx_lanes);
187}
188static DEVICE_ATTR_RO(rx_lanes);
189
190static ssize_t tx_lanes_show(struct device *dev, struct device_attribute *attr,
191 char *buf)
192{
193 struct usb_device *udev;
194
195 udev = to_usb_device(dev);
196 return sysfs_emit(buf, "%d\n", udev->tx_lanes);
197}
198static DEVICE_ATTR_RO(tx_lanes);
199
200static ssize_t busnum_show(struct device *dev, struct device_attribute *attr,
201 char *buf)
202{
203 struct usb_device *udev;
204
205 udev = to_usb_device(dev);
206 return sysfs_emit(buf, "%d\n", udev->bus->busnum);
207}
208static DEVICE_ATTR_RO(busnum);
209
210static ssize_t devnum_show(struct device *dev, struct device_attribute *attr,
211 char *buf)
212{
213 struct usb_device *udev;
214
215 udev = to_usb_device(dev);
216 return sysfs_emit(buf, "%d\n", udev->devnum);
217}
218static DEVICE_ATTR_RO(devnum);
219
220static ssize_t devpath_show(struct device *dev, struct device_attribute *attr,
221 char *buf)
222{
223 struct usb_device *udev;
224
225 udev = to_usb_device(dev);
226 return sysfs_emit(buf, "%s\n", udev->devpath);
227}
228static DEVICE_ATTR_RO(devpath);
229
230static ssize_t version_show(struct device *dev, struct device_attribute *attr,
231 char *buf)
232{
233 struct usb_device *udev;
234 u16 bcdUSB;
235
236 udev = to_usb_device(dev);
237 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
238 return sysfs_emit(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
239}
240static DEVICE_ATTR_RO(version);
241
242static ssize_t maxchild_show(struct device *dev, struct device_attribute *attr,
243 char *buf)
244{
245 struct usb_device *udev;
246
247 udev = to_usb_device(dev);
248 return sysfs_emit(buf, "%d\n", udev->maxchild);
249}
250static DEVICE_ATTR_RO(maxchild);
251
252static ssize_t quirks_show(struct device *dev, struct device_attribute *attr,
253 char *buf)
254{
255 struct usb_device *udev;
256
257 udev = to_usb_device(dev);
258 return sysfs_emit(buf, "0x%x\n", udev->quirks);
259}
260static DEVICE_ATTR_RO(quirks);
261
262static ssize_t avoid_reset_quirk_show(struct device *dev,
263 struct device_attribute *attr, char *buf)
264{
265 struct usb_device *udev;
266
267 udev = to_usb_device(dev);
268 return sysfs_emit(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET));
269}
270
271static ssize_t avoid_reset_quirk_store(struct device *dev,
272 struct device_attribute *attr,
273 const char *buf, size_t count)
274{
275 struct usb_device *udev = to_usb_device(dev);
276 int val, rc;
277
278 if (sscanf(buf, "%d", &val) != 1 || val < 0 || val > 1)
279 return -EINVAL;
280 rc = usb_lock_device_interruptible(udev);
281 if (rc < 0)
282 return -EINTR;
283 if (val)
284 udev->quirks |= USB_QUIRK_RESET;
285 else
286 udev->quirks &= ~USB_QUIRK_RESET;
287 usb_unlock_device(udev);
288 return count;
289}
290static DEVICE_ATTR_RW(avoid_reset_quirk);
291
292static ssize_t urbnum_show(struct device *dev, struct device_attribute *attr,
293 char *buf)
294{
295 struct usb_device *udev;
296
297 udev = to_usb_device(dev);
298 return sysfs_emit(buf, "%d\n", atomic_read(&udev->urbnum));
299}
300static DEVICE_ATTR_RO(urbnum);
301
302static ssize_t ltm_capable_show(struct device *dev,
303 struct device_attribute *attr, char *buf)
304{
305 if (usb_device_supports_ltm(to_usb_device(dev)))
306 return sysfs_emit(buf, "%s\n", "yes");
307 return sysfs_emit(buf, "%s\n", "no");
308}
309static DEVICE_ATTR_RO(ltm_capable);
310
311#ifdef CONFIG_PM
312
313static ssize_t persist_show(struct device *dev, struct device_attribute *attr,
314 char *buf)
315{
316 struct usb_device *udev = to_usb_device(dev);
317
318 return sysfs_emit(buf, "%d\n", udev->persist_enabled);
319}
320
321static ssize_t persist_store(struct device *dev, struct device_attribute *attr,
322 const char *buf, size_t count)
323{
324 struct usb_device *udev = to_usb_device(dev);
325 int value, rc;
326
327 /* Hubs are always enabled for USB_PERSIST */
328 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
329 return -EPERM;
330
331 if (sscanf(buf, "%d", &value) != 1)
332 return -EINVAL;
333
334 rc = usb_lock_device_interruptible(udev);
335 if (rc < 0)
336 return -EINTR;
337 udev->persist_enabled = !!value;
338 usb_unlock_device(udev);
339 return count;
340}
341static DEVICE_ATTR_RW(persist);
342
343static int add_persist_attributes(struct device *dev)
344{
345 int rc = 0;
346
347 if (is_usb_device(dev)) {
348 struct usb_device *udev = to_usb_device(dev);
349
350 /* Hubs are automatically enabled for USB_PERSIST,
351 * no point in creating the attribute file.
352 */
353 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
354 rc = sysfs_add_file_to_group(&dev->kobj,
355 &dev_attr_persist.attr,
356 power_group_name);
357 }
358 return rc;
359}
360
361static void remove_persist_attributes(struct device *dev)
362{
363 sysfs_remove_file_from_group(&dev->kobj,
364 &dev_attr_persist.attr,
365 power_group_name);
366}
367
368static ssize_t connected_duration_show(struct device *dev,
369 struct device_attribute *attr, char *buf)
370{
371 struct usb_device *udev = to_usb_device(dev);
372
373 return sysfs_emit(buf, "%u\n",
374 jiffies_to_msecs(jiffies - udev->connect_time));
375}
376static DEVICE_ATTR_RO(connected_duration);
377
378/*
379 * If the device is resumed, the last time the device was suspended has
380 * been pre-subtracted from active_duration. We add the current time to
381 * get the duration that the device was actually active.
382 *
383 * If the device is suspended, the active_duration is up-to-date.
384 */
385static ssize_t active_duration_show(struct device *dev,
386 struct device_attribute *attr, char *buf)
387{
388 struct usb_device *udev = to_usb_device(dev);
389 int duration;
390
391 if (udev->state != USB_STATE_SUSPENDED)
392 duration = jiffies_to_msecs(jiffies + udev->active_duration);
393 else
394 duration = jiffies_to_msecs(udev->active_duration);
395 return sysfs_emit(buf, "%u\n", duration);
396}
397static DEVICE_ATTR_RO(active_duration);
398
399static ssize_t autosuspend_show(struct device *dev,
400 struct device_attribute *attr, char *buf)
401{
402 return sysfs_emit(buf, "%d\n", dev->power.autosuspend_delay / 1000);
403}
404
405static ssize_t autosuspend_store(struct device *dev,
406 struct device_attribute *attr, const char *buf,
407 size_t count)
408{
409 int value;
410
411 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
412 value <= -INT_MAX/1000)
413 return -EINVAL;
414
415 pm_runtime_set_autosuspend_delay(dev, value * 1000);
416 return count;
417}
418static DEVICE_ATTR_RW(autosuspend);
419
420static const char on_string[] = "on";
421static const char auto_string[] = "auto";
422
423static void warn_level(void)
424{
425 static int level_warned;
426
427 if (!level_warned) {
428 level_warned = 1;
429 printk(KERN_WARNING "WARNING! power/level is deprecated; "
430 "use power/control instead\n");
431 }
432}
433
434static ssize_t level_show(struct device *dev, struct device_attribute *attr,
435 char *buf)
436{
437 struct usb_device *udev = to_usb_device(dev);
438 const char *p = auto_string;
439
440 warn_level();
441 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
442 p = on_string;
443 return sysfs_emit(buf, "%s\n", p);
444}
445
446static ssize_t level_store(struct device *dev, struct device_attribute *attr,
447 const char *buf, size_t count)
448{
449 struct usb_device *udev = to_usb_device(dev);
450 int len = count;
451 char *cp;
452 int rc = count;
453 int rv;
454
455 warn_level();
456 cp = memchr(buf, '\n', count);
457 if (cp)
458 len = cp - buf;
459
460 rv = usb_lock_device_interruptible(udev);
461 if (rv < 0)
462 return -EINTR;
463
464 if (len == sizeof on_string - 1 &&
465 strncmp(buf, on_string, len) == 0)
466 usb_disable_autosuspend(udev);
467
468 else if (len == sizeof auto_string - 1 &&
469 strncmp(buf, auto_string, len) == 0)
470 usb_enable_autosuspend(udev);
471
472 else
473 rc = -EINVAL;
474
475 usb_unlock_device(udev);
476 return rc;
477}
478static DEVICE_ATTR_RW(level);
479
480static ssize_t usb2_hardware_lpm_show(struct device *dev,
481 struct device_attribute *attr, char *buf)
482{
483 struct usb_device *udev = to_usb_device(dev);
484 const char *p;
485
486 if (udev->usb2_hw_lpm_allowed == 1)
487 p = "enabled";
488 else
489 p = "disabled";
490
491 return sysfs_emit(buf, "%s\n", p);
492}
493
494static ssize_t usb2_hardware_lpm_store(struct device *dev,
495 struct device_attribute *attr,
496 const char *buf, size_t count)
497{
498 struct usb_device *udev = to_usb_device(dev);
499 bool value;
500 int ret;
501
502 ret = usb_lock_device_interruptible(udev);
503 if (ret < 0)
504 return -EINTR;
505
506 ret = kstrtobool(buf, &value);
507
508 if (!ret) {
509 udev->usb2_hw_lpm_allowed = value;
510 if (value)
511 ret = usb_enable_usb2_hardware_lpm(udev);
512 else
513 ret = usb_disable_usb2_hardware_lpm(udev);
514 }
515
516 usb_unlock_device(udev);
517
518 if (!ret)
519 return count;
520
521 return ret;
522}
523static DEVICE_ATTR_RW(usb2_hardware_lpm);
524
525static ssize_t usb2_lpm_l1_timeout_show(struct device *dev,
526 struct device_attribute *attr,
527 char *buf)
528{
529 struct usb_device *udev = to_usb_device(dev);
530 return sysfs_emit(buf, "%d\n", udev->l1_params.timeout);
531}
532
533static ssize_t usb2_lpm_l1_timeout_store(struct device *dev,
534 struct device_attribute *attr,
535 const char *buf, size_t count)
536{
537 struct usb_device *udev = to_usb_device(dev);
538 u16 timeout;
539
540 if (kstrtou16(buf, 0, &timeout))
541 return -EINVAL;
542
543 udev->l1_params.timeout = timeout;
544
545 return count;
546}
547static DEVICE_ATTR_RW(usb2_lpm_l1_timeout);
548
549static ssize_t usb2_lpm_besl_show(struct device *dev,
550 struct device_attribute *attr, char *buf)
551{
552 struct usb_device *udev = to_usb_device(dev);
553 return sysfs_emit(buf, "%d\n", udev->l1_params.besl);
554}
555
556static ssize_t usb2_lpm_besl_store(struct device *dev,
557 struct device_attribute *attr,
558 const char *buf, size_t count)
559{
560 struct usb_device *udev = to_usb_device(dev);
561 u8 besl;
562
563 if (kstrtou8(buf, 0, &besl) || besl > 15)
564 return -EINVAL;
565
566 udev->l1_params.besl = besl;
567
568 return count;
569}
570static DEVICE_ATTR_RW(usb2_lpm_besl);
571
572static ssize_t usb3_hardware_lpm_u1_show(struct device *dev,
573 struct device_attribute *attr, char *buf)
574{
575 struct usb_device *udev = to_usb_device(dev);
576 const char *p;
577 int rc;
578
579 rc = usb_lock_device_interruptible(udev);
580 if (rc < 0)
581 return -EINTR;
582
583 if (udev->usb3_lpm_u1_enabled)
584 p = "enabled";
585 else
586 p = "disabled";
587
588 usb_unlock_device(udev);
589
590 return sysfs_emit(buf, "%s\n", p);
591}
592static DEVICE_ATTR_RO(usb3_hardware_lpm_u1);
593
594static ssize_t usb3_hardware_lpm_u2_show(struct device *dev,
595 struct device_attribute *attr, char *buf)
596{
597 struct usb_device *udev = to_usb_device(dev);
598 const char *p;
599 int rc;
600
601 rc = usb_lock_device_interruptible(udev);
602 if (rc < 0)
603 return -EINTR;
604
605 if (udev->usb3_lpm_u2_enabled)
606 p = "enabled";
607 else
608 p = "disabled";
609
610 usb_unlock_device(udev);
611
612 return sysfs_emit(buf, "%s\n", p);
613}
614static DEVICE_ATTR_RO(usb3_hardware_lpm_u2);
615
616static struct attribute *usb2_hardware_lpm_attr[] = {
617 &dev_attr_usb2_hardware_lpm.attr,
618 &dev_attr_usb2_lpm_l1_timeout.attr,
619 &dev_attr_usb2_lpm_besl.attr,
620 NULL,
621};
622static const struct attribute_group usb2_hardware_lpm_attr_group = {
623 .name = power_group_name,
624 .attrs = usb2_hardware_lpm_attr,
625};
626
627static struct attribute *usb3_hardware_lpm_attr[] = {
628 &dev_attr_usb3_hardware_lpm_u1.attr,
629 &dev_attr_usb3_hardware_lpm_u2.attr,
630 NULL,
631};
632static const struct attribute_group usb3_hardware_lpm_attr_group = {
633 .name = power_group_name,
634 .attrs = usb3_hardware_lpm_attr,
635};
636
637static struct attribute *power_attrs[] = {
638 &dev_attr_autosuspend.attr,
639 &dev_attr_level.attr,
640 &dev_attr_connected_duration.attr,
641 &dev_attr_active_duration.attr,
642 NULL,
643};
644static const struct attribute_group power_attr_group = {
645 .name = power_group_name,
646 .attrs = power_attrs,
647};
648
649static int add_power_attributes(struct device *dev)
650{
651 int rc = 0;
652
653 if (is_usb_device(dev)) {
654 struct usb_device *udev = to_usb_device(dev);
655 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
656 if (udev->usb2_hw_lpm_capable == 1)
657 rc = sysfs_merge_group(&dev->kobj,
658 &usb2_hardware_lpm_attr_group);
659 if ((udev->speed == USB_SPEED_SUPER ||
660 udev->speed == USB_SPEED_SUPER_PLUS) &&
661 udev->lpm_capable == 1)
662 rc = sysfs_merge_group(&dev->kobj,
663 &usb3_hardware_lpm_attr_group);
664 }
665
666 return rc;
667}
668
669static void remove_power_attributes(struct device *dev)
670{
671 sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
672 sysfs_unmerge_group(&dev->kobj, &power_attr_group);
673}
674
675#else
676
677#define add_persist_attributes(dev) 0
678#define remove_persist_attributes(dev) do {} while (0)
679
680#define add_power_attributes(dev) 0
681#define remove_power_attributes(dev) do {} while (0)
682
683#endif /* CONFIG_PM */
684
685
686/* Descriptor fields */
687#define usb_descriptor_attr_le16(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 sysfs_emit(buf, format_string, \
696 le16_to_cpu(udev->descriptor.field)); \
697} \
698static DEVICE_ATTR_RO(field)
699
700usb_descriptor_attr_le16(idVendor, "%04x\n");
701usb_descriptor_attr_le16(idProduct, "%04x\n");
702usb_descriptor_attr_le16(bcdDevice, "%04x\n");
703
704#define usb_descriptor_attr(field, format_string) \
705static ssize_t \
706field##_show(struct device *dev, struct device_attribute *attr, \
707 char *buf) \
708{ \
709 struct usb_device *udev; \
710 \
711 udev = to_usb_device(dev); \
712 return sysfs_emit(buf, format_string, udev->descriptor.field); \
713} \
714static DEVICE_ATTR_RO(field)
715
716usb_descriptor_attr(bDeviceClass, "%02x\n");
717usb_descriptor_attr(bDeviceSubClass, "%02x\n");
718usb_descriptor_attr(bDeviceProtocol, "%02x\n");
719usb_descriptor_attr(bNumConfigurations, "%d\n");
720usb_descriptor_attr(bMaxPacketSize0, "%d\n");
721
722
723/* show if the device is authorized (1) or not (0) */
724static ssize_t authorized_show(struct device *dev,
725 struct device_attribute *attr, char *buf)
726{
727 struct usb_device *usb_dev = to_usb_device(dev);
728 return sysfs_emit(buf, "%u\n", usb_dev->authorized);
729}
730
731/*
732 * Authorize a device to be used in the system
733 *
734 * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
735 */
736static ssize_t authorized_store(struct device *dev,
737 struct device_attribute *attr, const char *buf,
738 size_t size)
739{
740 ssize_t result;
741 struct usb_device *usb_dev = to_usb_device(dev);
742 unsigned val;
743 result = sscanf(buf, "%u\n", &val);
744 if (result != 1)
745 result = -EINVAL;
746 else if (val == 0)
747 result = usb_deauthorize_device(usb_dev);
748 else
749 result = usb_authorize_device(usb_dev);
750 return result < 0 ? result : size;
751}
752static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, S_IRUGO | S_IWUSR,
753 authorized_show, authorized_store);
754
755/* "Safely remove a device" */
756static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
757 const char *buf, size_t count)
758{
759 struct usb_device *udev = to_usb_device(dev);
760 int rc = 0;
761
762 usb_lock_device(udev);
763 if (udev->state != USB_STATE_NOTATTACHED) {
764
765 /* To avoid races, first unconfigure and then remove */
766 usb_set_configuration(udev, -1);
767 rc = usb_remove_device(udev);
768 }
769 if (rc == 0)
770 rc = count;
771 usb_unlock_device(udev);
772 return rc;
773}
774static DEVICE_ATTR_IGNORE_LOCKDEP(remove, S_IWUSR, NULL, remove_store);
775
776
777static struct attribute *dev_attrs[] = {
778 /* current configuration's attributes */
779 &dev_attr_configuration.attr,
780 &dev_attr_bNumInterfaces.attr,
781 &dev_attr_bConfigurationValue.attr,
782 &dev_attr_bmAttributes.attr,
783 &dev_attr_bMaxPower.attr,
784 /* device attributes */
785 &dev_attr_urbnum.attr,
786 &dev_attr_idVendor.attr,
787 &dev_attr_idProduct.attr,
788 &dev_attr_bcdDevice.attr,
789 &dev_attr_bDeviceClass.attr,
790 &dev_attr_bDeviceSubClass.attr,
791 &dev_attr_bDeviceProtocol.attr,
792 &dev_attr_bNumConfigurations.attr,
793 &dev_attr_bMaxPacketSize0.attr,
794 &dev_attr_speed.attr,
795 &dev_attr_rx_lanes.attr,
796 &dev_attr_tx_lanes.attr,
797 &dev_attr_busnum.attr,
798 &dev_attr_devnum.attr,
799 &dev_attr_devpath.attr,
800 &dev_attr_version.attr,
801 &dev_attr_maxchild.attr,
802 &dev_attr_quirks.attr,
803 &dev_attr_avoid_reset_quirk.attr,
804 &dev_attr_authorized.attr,
805 &dev_attr_remove.attr,
806 &dev_attr_ltm_capable.attr,
807#ifdef CONFIG_OF
808 &dev_attr_devspec.attr,
809#endif
810 NULL,
811};
812static const struct attribute_group dev_attr_grp = {
813 .attrs = dev_attrs,
814};
815
816/* When modifying this list, be sure to modify dev_string_attrs_are_visible()
817 * accordingly.
818 */
819static struct attribute *dev_string_attrs[] = {
820 &dev_attr_manufacturer.attr,
821 &dev_attr_product.attr,
822 &dev_attr_serial.attr,
823 NULL
824};
825
826static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
827 struct attribute *a, int n)
828{
829 struct device *dev = kobj_to_dev(kobj);
830 struct usb_device *udev = to_usb_device(dev);
831
832 if (a == &dev_attr_manufacturer.attr) {
833 if (udev->manufacturer == NULL)
834 return 0;
835 } else if (a == &dev_attr_product.attr) {
836 if (udev->product == NULL)
837 return 0;
838 } else if (a == &dev_attr_serial.attr) {
839 if (udev->serial == NULL)
840 return 0;
841 }
842 return a->mode;
843}
844
845static const struct attribute_group dev_string_attr_grp = {
846 .attrs = dev_string_attrs,
847 .is_visible = dev_string_attrs_are_visible,
848};
849
850const struct attribute_group *usb_device_groups[] = {
851 &dev_attr_grp,
852 &dev_string_attr_grp,
853 NULL
854};
855
856/* Binary descriptors */
857
858static ssize_t
859read_descriptors(struct file *filp, struct kobject *kobj,
860 struct bin_attribute *attr,
861 char *buf, loff_t off, size_t count)
862{
863 struct device *dev = kobj_to_dev(kobj);
864 struct usb_device *udev = to_usb_device(dev);
865 size_t nleft = count;
866 size_t srclen, n;
867 int cfgno;
868 void *src;
869
870 /* The binary attribute begins with the device descriptor.
871 * Following that are the raw descriptor entries for all the
872 * configurations (config plus subsidiary descriptors).
873 */
874 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
875 nleft > 0; ++cfgno) {
876 if (cfgno < 0) {
877 src = &udev->descriptor;
878 srclen = sizeof(struct usb_device_descriptor);
879 } else {
880 src = udev->rawdescriptors[cfgno];
881 srclen = __le16_to_cpu(udev->config[cfgno].desc.
882 wTotalLength);
883 }
884 if (off < srclen) {
885 n = min(nleft, srclen - (size_t) off);
886 memcpy(buf, src + off, n);
887 nleft -= n;
888 buf += n;
889 off = 0;
890 } else {
891 off -= srclen;
892 }
893 }
894 return count - nleft;
895}
896
897static struct bin_attribute dev_bin_attr_descriptors = {
898 .attr = {.name = "descriptors", .mode = 0444},
899 .read = read_descriptors,
900 .size = 18 + 65535, /* dev descr + max-size raw descriptor */
901};
902
903/*
904 * Show & store the current value of authorized_default
905 */
906static ssize_t authorized_default_show(struct device *dev,
907 struct device_attribute *attr, char *buf)
908{
909 struct usb_device *rh_usb_dev = to_usb_device(dev);
910 struct usb_bus *usb_bus = rh_usb_dev->bus;
911 struct usb_hcd *hcd;
912
913 hcd = bus_to_hcd(usb_bus);
914 return sysfs_emit(buf, "%u\n", hcd->dev_policy);
915}
916
917static ssize_t authorized_default_store(struct device *dev,
918 struct device_attribute *attr,
919 const char *buf, size_t size)
920{
921 ssize_t result;
922 unsigned int val;
923 struct usb_device *rh_usb_dev = to_usb_device(dev);
924 struct usb_bus *usb_bus = rh_usb_dev->bus;
925 struct usb_hcd *hcd;
926
927 hcd = bus_to_hcd(usb_bus);
928 result = sscanf(buf, "%u\n", &val);
929 if (result == 1) {
930 hcd->dev_policy = val <= USB_DEVICE_AUTHORIZE_INTERNAL ?
931 val : USB_DEVICE_AUTHORIZE_ALL;
932 result = size;
933 } else {
934 result = -EINVAL;
935 }
936 return result;
937}
938static DEVICE_ATTR_RW(authorized_default);
939
940/*
941 * interface_authorized_default_show - show default authorization status
942 * for USB interfaces
943 *
944 * note: interface_authorized_default is the default value
945 * for initializing the authorized attribute of interfaces
946 */
947static ssize_t interface_authorized_default_show(struct device *dev,
948 struct device_attribute *attr, char *buf)
949{
950 struct usb_device *usb_dev = to_usb_device(dev);
951 struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
952
953 return sysfs_emit(buf, "%u\n", !!HCD_INTF_AUTHORIZED(hcd));
954}
955
956/*
957 * interface_authorized_default_store - store default authorization status
958 * for USB interfaces
959 *
960 * note: interface_authorized_default is the default value
961 * for initializing the authorized attribute of interfaces
962 */
963static ssize_t interface_authorized_default_store(struct device *dev,
964 struct device_attribute *attr, const char *buf, size_t count)
965{
966 struct usb_device *usb_dev = to_usb_device(dev);
967 struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
968 int rc = count;
969 bool val;
970
971 if (kstrtobool(buf, &val) != 0)
972 return -EINVAL;
973
974 if (val)
975 set_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
976 else
977 clear_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
978
979 return rc;
980}
981static DEVICE_ATTR_RW(interface_authorized_default);
982
983/* Group all the USB bus attributes */
984static struct attribute *usb_bus_attrs[] = {
985 &dev_attr_authorized_default.attr,
986 &dev_attr_interface_authorized_default.attr,
987 NULL,
988};
989
990static const struct attribute_group usb_bus_attr_group = {
991 .name = NULL, /* we want them in the same directory */
992 .attrs = usb_bus_attrs,
993};
994
995
996static int add_default_authorized_attributes(struct device *dev)
997{
998 int rc = 0;
999
1000 if (is_usb_device(dev))
1001 rc = sysfs_create_group(&dev->kobj, &usb_bus_attr_group);
1002
1003 return rc;
1004}
1005
1006static void remove_default_authorized_attributes(struct device *dev)
1007{
1008 if (is_usb_device(dev)) {
1009 sysfs_remove_group(&dev->kobj, &usb_bus_attr_group);
1010 }
1011}
1012
1013int usb_create_sysfs_dev_files(struct usb_device *udev)
1014{
1015 struct device *dev = &udev->dev;
1016 int retval;
1017
1018 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
1019 if (retval)
1020 goto error;
1021
1022 retval = add_persist_attributes(dev);
1023 if (retval)
1024 goto error;
1025
1026 retval = add_power_attributes(dev);
1027 if (retval)
1028 goto error;
1029
1030 if (is_root_hub(udev)) {
1031 retval = add_default_authorized_attributes(dev);
1032 if (retval)
1033 goto error;
1034 }
1035 return retval;
1036
1037error:
1038 usb_remove_sysfs_dev_files(udev);
1039 return retval;
1040}
1041
1042void usb_remove_sysfs_dev_files(struct usb_device *udev)
1043{
1044 struct device *dev = &udev->dev;
1045
1046 if (is_root_hub(udev))
1047 remove_default_authorized_attributes(dev);
1048
1049 remove_power_attributes(dev);
1050 remove_persist_attributes(dev);
1051 device_remove_bin_file(dev, &dev_bin_attr_descriptors);
1052}
1053
1054/* Interface Association Descriptor fields */
1055#define usb_intf_assoc_attr(field, format_string) \
1056static ssize_t \
1057iad_##field##_show(struct device *dev, struct device_attribute *attr, \
1058 char *buf) \
1059{ \
1060 struct usb_interface *intf = to_usb_interface(dev); \
1061 \
1062 return sysfs_emit(buf, format_string, \
1063 intf->intf_assoc->field); \
1064} \
1065static DEVICE_ATTR_RO(iad_##field)
1066
1067usb_intf_assoc_attr(bFirstInterface, "%02x\n");
1068usb_intf_assoc_attr(bInterfaceCount, "%02d\n");
1069usb_intf_assoc_attr(bFunctionClass, "%02x\n");
1070usb_intf_assoc_attr(bFunctionSubClass, "%02x\n");
1071usb_intf_assoc_attr(bFunctionProtocol, "%02x\n");
1072
1073/* Interface fields */
1074#define usb_intf_attr(field, format_string) \
1075static ssize_t \
1076field##_show(struct device *dev, struct device_attribute *attr, \
1077 char *buf) \
1078{ \
1079 struct usb_interface *intf = to_usb_interface(dev); \
1080 \
1081 return sysfs_emit(buf, format_string, \
1082 intf->cur_altsetting->desc.field); \
1083} \
1084static DEVICE_ATTR_RO(field)
1085
1086usb_intf_attr(bInterfaceNumber, "%02x\n");
1087usb_intf_attr(bAlternateSetting, "%2d\n");
1088usb_intf_attr(bNumEndpoints, "%02x\n");
1089usb_intf_attr(bInterfaceClass, "%02x\n");
1090usb_intf_attr(bInterfaceSubClass, "%02x\n");
1091usb_intf_attr(bInterfaceProtocol, "%02x\n");
1092
1093static ssize_t interface_show(struct device *dev, struct device_attribute *attr,
1094 char *buf)
1095{
1096 struct usb_interface *intf;
1097 char *string;
1098
1099 intf = to_usb_interface(dev);
1100 string = READ_ONCE(intf->cur_altsetting->string);
1101 if (!string)
1102 return 0;
1103 return sysfs_emit(buf, "%s\n", string);
1104}
1105static DEVICE_ATTR_RO(interface);
1106
1107static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
1108 char *buf)
1109{
1110 struct usb_interface *intf;
1111 struct usb_device *udev;
1112 struct usb_host_interface *alt;
1113
1114 intf = to_usb_interface(dev);
1115 udev = interface_to_usbdev(intf);
1116 alt = READ_ONCE(intf->cur_altsetting);
1117
1118 return sysfs_emit(buf,
1119 "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
1120 "ic%02Xisc%02Xip%02Xin%02X\n",
1121 le16_to_cpu(udev->descriptor.idVendor),
1122 le16_to_cpu(udev->descriptor.idProduct),
1123 le16_to_cpu(udev->descriptor.bcdDevice),
1124 udev->descriptor.bDeviceClass,
1125 udev->descriptor.bDeviceSubClass,
1126 udev->descriptor.bDeviceProtocol,
1127 alt->desc.bInterfaceClass,
1128 alt->desc.bInterfaceSubClass,
1129 alt->desc.bInterfaceProtocol,
1130 alt->desc.bInterfaceNumber);
1131}
1132static DEVICE_ATTR_RO(modalias);
1133
1134static ssize_t supports_autosuspend_show(struct device *dev,
1135 struct device_attribute *attr,
1136 char *buf)
1137{
1138 int s;
1139
1140 s = device_lock_interruptible(dev);
1141 if (s < 0)
1142 return -EINTR;
1143 /* Devices will be autosuspended even when an interface isn't claimed */
1144 s = (!dev->driver || to_usb_driver(dev->driver)->supports_autosuspend);
1145 device_unlock(dev);
1146
1147 return sysfs_emit(buf, "%u\n", s);
1148}
1149static DEVICE_ATTR_RO(supports_autosuspend);
1150
1151/*
1152 * interface_authorized_show - show authorization status of an USB interface
1153 * 1 is authorized, 0 is deauthorized
1154 */
1155static ssize_t interface_authorized_show(struct device *dev,
1156 struct device_attribute *attr, char *buf)
1157{
1158 struct usb_interface *intf = to_usb_interface(dev);
1159
1160 return sysfs_emit(buf, "%u\n", intf->authorized);
1161}
1162
1163/*
1164 * interface_authorized_store - authorize or deauthorize an USB interface
1165 */
1166static ssize_t interface_authorized_store(struct device *dev,
1167 struct device_attribute *attr, const char *buf, size_t count)
1168{
1169 struct usb_interface *intf = to_usb_interface(dev);
1170 bool val;
1171
1172 if (kstrtobool(buf, &val) != 0)
1173 return -EINVAL;
1174
1175 if (val)
1176 usb_authorize_interface(intf);
1177 else
1178 usb_deauthorize_interface(intf);
1179
1180 return count;
1181}
1182static struct device_attribute dev_attr_interface_authorized =
1183 __ATTR(authorized, S_IRUGO | S_IWUSR,
1184 interface_authorized_show, interface_authorized_store);
1185
1186static struct attribute *intf_attrs[] = {
1187 &dev_attr_bInterfaceNumber.attr,
1188 &dev_attr_bAlternateSetting.attr,
1189 &dev_attr_bNumEndpoints.attr,
1190 &dev_attr_bInterfaceClass.attr,
1191 &dev_attr_bInterfaceSubClass.attr,
1192 &dev_attr_bInterfaceProtocol.attr,
1193 &dev_attr_modalias.attr,
1194 &dev_attr_supports_autosuspend.attr,
1195 &dev_attr_interface_authorized.attr,
1196 NULL,
1197};
1198static const struct attribute_group intf_attr_grp = {
1199 .attrs = intf_attrs,
1200};
1201
1202static struct attribute *intf_assoc_attrs[] = {
1203 &dev_attr_iad_bFirstInterface.attr,
1204 &dev_attr_iad_bInterfaceCount.attr,
1205 &dev_attr_iad_bFunctionClass.attr,
1206 &dev_attr_iad_bFunctionSubClass.attr,
1207 &dev_attr_iad_bFunctionProtocol.attr,
1208 NULL,
1209};
1210
1211static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
1212 struct attribute *a, int n)
1213{
1214 struct device *dev = kobj_to_dev(kobj);
1215 struct usb_interface *intf = to_usb_interface(dev);
1216
1217 if (intf->intf_assoc == NULL)
1218 return 0;
1219 return a->mode;
1220}
1221
1222static const struct attribute_group intf_assoc_attr_grp = {
1223 .attrs = intf_assoc_attrs,
1224 .is_visible = intf_assoc_attrs_are_visible,
1225};
1226
1227static ssize_t wireless_status_show(struct device *dev,
1228 struct device_attribute *attr, char *buf)
1229{
1230 struct usb_interface *intf;
1231
1232 intf = to_usb_interface(dev);
1233 if (intf->wireless_status == USB_WIRELESS_STATUS_DISCONNECTED)
1234 return sysfs_emit(buf, "%s\n", "disconnected");
1235 return sysfs_emit(buf, "%s\n", "connected");
1236}
1237static DEVICE_ATTR_RO(wireless_status);
1238
1239static struct attribute *intf_wireless_status_attrs[] = {
1240 &dev_attr_wireless_status.attr,
1241 NULL
1242};
1243
1244static umode_t intf_wireless_status_attr_is_visible(struct kobject *kobj,
1245 struct attribute *a, int n)
1246{
1247 struct device *dev = kobj_to_dev(kobj);
1248 struct usb_interface *intf = to_usb_interface(dev);
1249
1250 if (a != &dev_attr_wireless_status.attr ||
1251 intf->wireless_status != USB_WIRELESS_STATUS_NA)
1252 return a->mode;
1253 return 0;
1254}
1255
1256static const struct attribute_group intf_wireless_status_attr_grp = {
1257 .attrs = intf_wireless_status_attrs,
1258 .is_visible = intf_wireless_status_attr_is_visible,
1259};
1260
1261int usb_update_wireless_status_attr(struct usb_interface *intf)
1262{
1263 struct device *dev = &intf->dev;
1264 int ret;
1265
1266 ret = sysfs_update_group(&dev->kobj, &intf_wireless_status_attr_grp);
1267 if (ret < 0)
1268 return ret;
1269
1270 sysfs_notify(&dev->kobj, NULL, "wireless_status");
1271 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
1272
1273 return 0;
1274}
1275
1276const struct attribute_group *usb_interface_groups[] = {
1277 &intf_attr_grp,
1278 &intf_assoc_attr_grp,
1279 &intf_wireless_status_attr_grp,
1280 NULL
1281};
1282
1283void usb_create_sysfs_intf_files(struct usb_interface *intf)
1284{
1285 struct usb_device *udev = interface_to_usbdev(intf);
1286 struct usb_host_interface *alt = intf->cur_altsetting;
1287
1288 if (intf->sysfs_files_created || intf->unregistering)
1289 return;
1290
1291 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
1292 alt->string = usb_cache_string(udev, alt->desc.iInterface);
1293 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface)) {
1294 /* This is not a serious error */
1295 dev_dbg(&intf->dev, "interface string descriptor file not created\n");
1296 }
1297 intf->sysfs_files_created = 1;
1298}
1299
1300void usb_remove_sysfs_intf_files(struct usb_interface *intf)
1301{
1302 if (!intf->sysfs_files_created)
1303 return;
1304
1305 device_remove_file(&intf->dev, &dev_attr_interface);
1306 intf->sysfs_files_created = 0;
1307}
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, 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/* configuration value is always present, and r/w */
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_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,
77 show_bConfigurationValue, set_bConfigurationValue);
78
79/* String fields */
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 int retval; \
86 \
87 udev = to_usb_device(dev); \
88 usb_lock_device(udev); \
89 retval = sprintf(buf, "%s\n", udev->name); \
90 usb_unlock_device(udev); \
91 return retval; \
92} \
93static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
94
95usb_string_attr(product);
96usb_string_attr(manufacturer);
97usb_string_attr(serial);
98
99static ssize_t
100show_speed(struct device *dev, struct device_attribute *attr, char *buf)
101{
102 struct usb_device *udev;
103 char *speed;
104
105 udev = to_usb_device(dev);
106
107 switch (udev->speed) {
108 case USB_SPEED_LOW:
109 speed = "1.5";
110 break;
111 case USB_SPEED_UNKNOWN:
112 case USB_SPEED_FULL:
113 speed = "12";
114 break;
115 case USB_SPEED_HIGH:
116 speed = "480";
117 break;
118 case USB_SPEED_WIRELESS:
119 speed = "480";
120 break;
121 case USB_SPEED_SUPER:
122 speed = "5000";
123 break;
124 default:
125 speed = "unknown";
126 }
127 return sprintf(buf, "%s\n", speed);
128}
129static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL);
130
131static ssize_t
132show_busnum(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->bus->busnum);
138}
139static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL);
140
141static ssize_t
142show_devnum(struct device *dev, struct device_attribute *attr, char *buf)
143{
144 struct usb_device *udev;
145
146 udev = to_usb_device(dev);
147 return sprintf(buf, "%d\n", udev->devnum);
148}
149static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL);
150
151static ssize_t
152show_devpath(struct device *dev, struct device_attribute *attr, char *buf)
153{
154 struct usb_device *udev;
155
156 udev = to_usb_device(dev);
157 return sprintf(buf, "%s\n", udev->devpath);
158}
159static DEVICE_ATTR(devpath, S_IRUGO, show_devpath, NULL);
160
161static ssize_t
162show_version(struct device *dev, struct device_attribute *attr, char *buf)
163{
164 struct usb_device *udev;
165 u16 bcdUSB;
166
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);
170}
171static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
172
173static ssize_t
174show_maxchild(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", udev->maxchild);
180}
181static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL);
182
183static ssize_t
184show_quirks(struct device *dev, struct device_attribute *attr, char *buf)
185{
186 struct usb_device *udev;
187
188 udev = to_usb_device(dev);
189 return sprintf(buf, "0x%x\n", udev->quirks);
190}
191static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);
192
193static ssize_t
194show_avoid_reset_quirk(struct device *dev, struct device_attribute *attr, char *buf)
195{
196 struct usb_device *udev;
197
198 udev = to_usb_device(dev);
199 return sprintf(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET_MORPHS));
200}
201
202static ssize_t
203set_avoid_reset_quirk(struct device *dev, struct device_attribute *attr,
204 const char *buf, size_t count)
205{
206 struct usb_device *udev = to_usb_device(dev);
207 int config;
208
209 if (sscanf(buf, "%d", &config) != 1 || config < 0 || config > 1)
210 return -EINVAL;
211 usb_lock_device(udev);
212 if (config)
213 udev->quirks |= USB_QUIRK_RESET_MORPHS;
214 else
215 udev->quirks &= ~USB_QUIRK_RESET_MORPHS;
216 usb_unlock_device(udev);
217 return count;
218}
219
220static DEVICE_ATTR(avoid_reset_quirk, S_IRUGO | S_IWUSR,
221 show_avoid_reset_quirk, set_avoid_reset_quirk);
222
223static ssize_t
224show_urbnum(struct device *dev, struct device_attribute *attr, char *buf)
225{
226 struct usb_device *udev;
227
228 udev = to_usb_device(dev);
229 return sprintf(buf, "%d\n", atomic_read(&udev->urbnum));
230}
231static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL);
232
233static ssize_t
234show_removable(struct device *dev, struct device_attribute *attr, char *buf)
235{
236 struct usb_device *udev;
237 char *state;
238
239 udev = to_usb_device(dev);
240
241 switch (udev->removable) {
242 case USB_DEVICE_REMOVABLE:
243 state = "removable";
244 break;
245 case USB_DEVICE_FIXED:
246 state = "fixed";
247 break;
248 default:
249 state = "unknown";
250 }
251
252 return sprintf(buf, "%s\n", state);
253}
254static DEVICE_ATTR(removable, S_IRUGO, show_removable, NULL);
255
256#ifdef CONFIG_PM
257
258static ssize_t
259show_persist(struct device *dev, struct device_attribute *attr, char *buf)
260{
261 struct usb_device *udev = to_usb_device(dev);
262
263 return sprintf(buf, "%d\n", udev->persist_enabled);
264}
265
266static ssize_t
267set_persist(struct device *dev, struct device_attribute *attr,
268 const char *buf, size_t count)
269{
270 struct usb_device *udev = to_usb_device(dev);
271 int value;
272
273 /* Hubs are always enabled for USB_PERSIST */
274 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
275 return -EPERM;
276
277 if (sscanf(buf, "%d", &value) != 1)
278 return -EINVAL;
279
280 usb_lock_device(udev);
281 udev->persist_enabled = !!value;
282 usb_unlock_device(udev);
283 return count;
284}
285
286static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
287
288static int add_persist_attributes(struct device *dev)
289{
290 int rc = 0;
291
292 if (is_usb_device(dev)) {
293 struct usb_device *udev = to_usb_device(dev);
294
295 /* Hubs are automatically enabled for USB_PERSIST,
296 * no point in creating the attribute file.
297 */
298 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
299 rc = sysfs_add_file_to_group(&dev->kobj,
300 &dev_attr_persist.attr,
301 power_group_name);
302 }
303 return rc;
304}
305
306static void remove_persist_attributes(struct device *dev)
307{
308 sysfs_remove_file_from_group(&dev->kobj,
309 &dev_attr_persist.attr,
310 power_group_name);
311}
312#else
313
314#define add_persist_attributes(dev) 0
315#define remove_persist_attributes(dev) do {} while (0)
316
317#endif /* CONFIG_PM */
318
319#ifdef CONFIG_USB_SUSPEND
320
321static ssize_t
322show_connected_duration(struct device *dev, struct device_attribute *attr,
323 char *buf)
324{
325 struct usb_device *udev = to_usb_device(dev);
326
327 return sprintf(buf, "%u\n",
328 jiffies_to_msecs(jiffies - udev->connect_time));
329}
330
331static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
332
333/*
334 * If the device is resumed, the last time the device was suspended has
335 * been pre-subtracted from active_duration. We add the current time to
336 * get the duration that the device was actually active.
337 *
338 * If the device is suspended, the active_duration is up-to-date.
339 */
340static ssize_t
341show_active_duration(struct device *dev, struct device_attribute *attr,
342 char *buf)
343{
344 struct usb_device *udev = to_usb_device(dev);
345 int duration;
346
347 if (udev->state != USB_STATE_SUSPENDED)
348 duration = jiffies_to_msecs(jiffies + udev->active_duration);
349 else
350 duration = jiffies_to_msecs(udev->active_duration);
351 return sprintf(buf, "%u\n", duration);
352}
353
354static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
355
356static ssize_t
357show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
358{
359 return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000);
360}
361
362static ssize_t
363set_autosuspend(struct device *dev, struct device_attribute *attr,
364 const char *buf, size_t count)
365{
366 int value;
367
368 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
369 value <= -INT_MAX/1000)
370 return -EINVAL;
371
372 pm_runtime_set_autosuspend_delay(dev, value * 1000);
373 return count;
374}
375
376static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
377 show_autosuspend, set_autosuspend);
378
379static const char on_string[] = "on";
380static const char auto_string[] = "auto";
381
382static void warn_level(void) {
383 static int level_warned;
384
385 if (!level_warned) {
386 level_warned = 1;
387 printk(KERN_WARNING "WARNING! power/level is deprecated; "
388 "use power/control instead\n");
389 }
390}
391
392static ssize_t
393show_level(struct device *dev, struct device_attribute *attr, char *buf)
394{
395 struct usb_device *udev = to_usb_device(dev);
396 const char *p = auto_string;
397
398 warn_level();
399 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
400 p = on_string;
401 return sprintf(buf, "%s\n", p);
402}
403
404static ssize_t
405set_level(struct device *dev, struct device_attribute *attr,
406 const char *buf, size_t count)
407{
408 struct usb_device *udev = to_usb_device(dev);
409 int len = count;
410 char *cp;
411 int rc = count;
412
413 warn_level();
414 cp = memchr(buf, '\n', count);
415 if (cp)
416 len = cp - buf;
417
418 usb_lock_device(udev);
419
420 if (len == sizeof on_string - 1 &&
421 strncmp(buf, on_string, len) == 0)
422 usb_disable_autosuspend(udev);
423
424 else if (len == sizeof auto_string - 1 &&
425 strncmp(buf, auto_string, len) == 0)
426 usb_enable_autosuspend(udev);
427
428 else
429 rc = -EINVAL;
430
431 usb_unlock_device(udev);
432 return rc;
433}
434
435static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
436
437static ssize_t
438show_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr,
439 char *buf)
440{
441 struct usb_device *udev = to_usb_device(dev);
442 const char *p;
443
444 if (udev->usb2_hw_lpm_enabled == 1)
445 p = "enabled";
446 else
447 p = "disabled";
448
449 return sprintf(buf, "%s\n", p);
450}
451
452static ssize_t
453set_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr,
454 const char *buf, size_t count)
455{
456 struct usb_device *udev = to_usb_device(dev);
457 bool value;
458 int ret;
459
460 usb_lock_device(udev);
461
462 ret = strtobool(buf, &value);
463
464 if (!ret)
465 ret = usb_set_usb2_hardware_lpm(udev, value);
466
467 usb_unlock_device(udev);
468
469 if (!ret)
470 return count;
471
472 return ret;
473}
474
475static DEVICE_ATTR(usb2_hardware_lpm, S_IRUGO | S_IWUSR, show_usb2_hardware_lpm,
476 set_usb2_hardware_lpm);
477
478static struct attribute *usb2_hardware_lpm_attr[] = {
479 &dev_attr_usb2_hardware_lpm.attr,
480 NULL,
481};
482static struct attribute_group usb2_hardware_lpm_attr_group = {
483 .name = power_group_name,
484 .attrs = usb2_hardware_lpm_attr,
485};
486
487static struct attribute *power_attrs[] = {
488 &dev_attr_autosuspend.attr,
489 &dev_attr_level.attr,
490 &dev_attr_connected_duration.attr,
491 &dev_attr_active_duration.attr,
492 NULL,
493};
494static struct attribute_group power_attr_group = {
495 .name = power_group_name,
496 .attrs = power_attrs,
497};
498
499static int add_power_attributes(struct device *dev)
500{
501 int rc = 0;
502
503 if (is_usb_device(dev)) {
504 struct usb_device *udev = to_usb_device(dev);
505 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
506 if (udev->usb2_hw_lpm_capable == 1)
507 rc = sysfs_merge_group(&dev->kobj,
508 &usb2_hardware_lpm_attr_group);
509 }
510
511 return rc;
512}
513
514static void remove_power_attributes(struct device *dev)
515{
516 sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
517 sysfs_unmerge_group(&dev->kobj, &power_attr_group);
518}
519
520#else
521
522#define add_power_attributes(dev) 0
523#define remove_power_attributes(dev) do {} while (0)
524
525#endif /* CONFIG_USB_SUSPEND */
526
527
528/* Descriptor fields */
529#define usb_descriptor_attr_le16(field, format_string) \
530static ssize_t \
531show_##field(struct device *dev, struct device_attribute *attr, \
532 char *buf) \
533{ \
534 struct usb_device *udev; \
535 \
536 udev = to_usb_device(dev); \
537 return sprintf(buf, format_string, \
538 le16_to_cpu(udev->descriptor.field)); \
539} \
540static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
541
542usb_descriptor_attr_le16(idVendor, "%04x\n")
543usb_descriptor_attr_le16(idProduct, "%04x\n")
544usb_descriptor_attr_le16(bcdDevice, "%04x\n")
545
546#define usb_descriptor_attr(field, format_string) \
547static ssize_t \
548show_##field(struct device *dev, struct device_attribute *attr, \
549 char *buf) \
550{ \
551 struct usb_device *udev; \
552 \
553 udev = to_usb_device(dev); \
554 return sprintf(buf, format_string, udev->descriptor.field); \
555} \
556static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
557
558usb_descriptor_attr(bDeviceClass, "%02x\n")
559usb_descriptor_attr(bDeviceSubClass, "%02x\n")
560usb_descriptor_attr(bDeviceProtocol, "%02x\n")
561usb_descriptor_attr(bNumConfigurations, "%d\n")
562usb_descriptor_attr(bMaxPacketSize0, "%d\n")
563
564
565
566/* show if the device is authorized (1) or not (0) */
567static ssize_t usb_dev_authorized_show(struct device *dev,
568 struct device_attribute *attr,
569 char *buf)
570{
571 struct usb_device *usb_dev = to_usb_device(dev);
572 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
573}
574
575
576/*
577 * Authorize a device to be used in the system
578 *
579 * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
580 */
581static ssize_t usb_dev_authorized_store(struct device *dev,
582 struct device_attribute *attr,
583 const char *buf, size_t size)
584{
585 ssize_t result;
586 struct usb_device *usb_dev = to_usb_device(dev);
587 unsigned val;
588 result = sscanf(buf, "%u\n", &val);
589 if (result != 1)
590 result = -EINVAL;
591 else if (val == 0)
592 result = usb_deauthorize_device(usb_dev);
593 else
594 result = usb_authorize_device(usb_dev);
595 return result < 0? result : size;
596}
597
598static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, 0644,
599 usb_dev_authorized_show, usb_dev_authorized_store);
600
601/* "Safely remove a device" */
602static ssize_t usb_remove_store(struct device *dev,
603 struct device_attribute *attr,
604 const char *buf, size_t count)
605{
606 struct usb_device *udev = to_usb_device(dev);
607 int rc = 0;
608
609 usb_lock_device(udev);
610 if (udev->state != USB_STATE_NOTATTACHED) {
611
612 /* To avoid races, first unconfigure and then remove */
613 usb_set_configuration(udev, -1);
614 rc = usb_remove_device(udev);
615 }
616 if (rc == 0)
617 rc = count;
618 usb_unlock_device(udev);
619 return rc;
620}
621static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0200, NULL, usb_remove_store);
622
623
624static struct attribute *dev_attrs[] = {
625 /* current configuration's attributes */
626 &dev_attr_configuration.attr,
627 &dev_attr_bNumInterfaces.attr,
628 &dev_attr_bConfigurationValue.attr,
629 &dev_attr_bmAttributes.attr,
630 &dev_attr_bMaxPower.attr,
631 /* device attributes */
632 &dev_attr_urbnum.attr,
633 &dev_attr_idVendor.attr,
634 &dev_attr_idProduct.attr,
635 &dev_attr_bcdDevice.attr,
636 &dev_attr_bDeviceClass.attr,
637 &dev_attr_bDeviceSubClass.attr,
638 &dev_attr_bDeviceProtocol.attr,
639 &dev_attr_bNumConfigurations.attr,
640 &dev_attr_bMaxPacketSize0.attr,
641 &dev_attr_speed.attr,
642 &dev_attr_busnum.attr,
643 &dev_attr_devnum.attr,
644 &dev_attr_devpath.attr,
645 &dev_attr_version.attr,
646 &dev_attr_maxchild.attr,
647 &dev_attr_quirks.attr,
648 &dev_attr_avoid_reset_quirk.attr,
649 &dev_attr_authorized.attr,
650 &dev_attr_remove.attr,
651 &dev_attr_removable.attr,
652 NULL,
653};
654static struct attribute_group dev_attr_grp = {
655 .attrs = dev_attrs,
656};
657
658/* When modifying this list, be sure to modify dev_string_attrs_are_visible()
659 * accordingly.
660 */
661static struct attribute *dev_string_attrs[] = {
662 &dev_attr_manufacturer.attr,
663 &dev_attr_product.attr,
664 &dev_attr_serial.attr,
665 NULL
666};
667
668static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
669 struct attribute *a, int n)
670{
671 struct device *dev = container_of(kobj, struct device, kobj);
672 struct usb_device *udev = to_usb_device(dev);
673
674 if (a == &dev_attr_manufacturer.attr) {
675 if (udev->manufacturer == NULL)
676 return 0;
677 } else if (a == &dev_attr_product.attr) {
678 if (udev->product == NULL)
679 return 0;
680 } else if (a == &dev_attr_serial.attr) {
681 if (udev->serial == NULL)
682 return 0;
683 }
684 return a->mode;
685}
686
687static struct attribute_group dev_string_attr_grp = {
688 .attrs = dev_string_attrs,
689 .is_visible = dev_string_attrs_are_visible,
690};
691
692const struct attribute_group *usb_device_groups[] = {
693 &dev_attr_grp,
694 &dev_string_attr_grp,
695 NULL
696};
697
698/* Binary descriptors */
699
700static ssize_t
701read_descriptors(struct file *filp, struct kobject *kobj,
702 struct bin_attribute *attr,
703 char *buf, loff_t off, size_t count)
704{
705 struct device *dev = container_of(kobj, struct device, kobj);
706 struct usb_device *udev = to_usb_device(dev);
707 size_t nleft = count;
708 size_t srclen, n;
709 int cfgno;
710 void *src;
711
712 /* The binary attribute begins with the device descriptor.
713 * Following that are the raw descriptor entries for all the
714 * configurations (config plus subsidiary descriptors).
715 */
716 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
717 nleft > 0; ++cfgno) {
718 if (cfgno < 0) {
719 src = &udev->descriptor;
720 srclen = sizeof(struct usb_device_descriptor);
721 } else {
722 src = udev->rawdescriptors[cfgno];
723 srclen = __le16_to_cpu(udev->config[cfgno].desc.
724 wTotalLength);
725 }
726 if (off < srclen) {
727 n = min(nleft, srclen - (size_t) off);
728 memcpy(buf, src + off, n);
729 nleft -= n;
730 buf += n;
731 off = 0;
732 } else {
733 off -= srclen;
734 }
735 }
736 return count - nleft;
737}
738
739static struct bin_attribute dev_bin_attr_descriptors = {
740 .attr = {.name = "descriptors", .mode = 0444},
741 .read = read_descriptors,
742 .size = 18 + 65535, /* dev descr + max-size raw descriptor */
743};
744
745int usb_create_sysfs_dev_files(struct usb_device *udev)
746{
747 struct device *dev = &udev->dev;
748 int retval;
749
750 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
751 if (retval)
752 goto error;
753
754 retval = add_persist_attributes(dev);
755 if (retval)
756 goto error;
757
758 retval = add_power_attributes(dev);
759 if (retval)
760 goto error;
761 return retval;
762error:
763 usb_remove_sysfs_dev_files(udev);
764 return retval;
765}
766
767void usb_remove_sysfs_dev_files(struct usb_device *udev)
768{
769 struct device *dev = &udev->dev;
770
771 remove_power_attributes(dev);
772 remove_persist_attributes(dev);
773 device_remove_bin_file(dev, &dev_bin_attr_descriptors);
774}
775
776/* Interface Accociation Descriptor fields */
777#define usb_intf_assoc_attr(field, format_string) \
778static ssize_t \
779show_iad_##field(struct device *dev, struct device_attribute *attr, \
780 char *buf) \
781{ \
782 struct usb_interface *intf = to_usb_interface(dev); \
783 \
784 return sprintf(buf, format_string, \
785 intf->intf_assoc->field); \
786} \
787static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
788
789usb_intf_assoc_attr(bFirstInterface, "%02x\n")
790usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
791usb_intf_assoc_attr(bFunctionClass, "%02x\n")
792usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
793usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
794
795/* Interface fields */
796#define usb_intf_attr(field, format_string) \
797static ssize_t \
798show_##field(struct device *dev, struct device_attribute *attr, \
799 char *buf) \
800{ \
801 struct usb_interface *intf = to_usb_interface(dev); \
802 \
803 return sprintf(buf, format_string, \
804 intf->cur_altsetting->desc.field); \
805} \
806static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
807
808usb_intf_attr(bInterfaceNumber, "%02x\n")
809usb_intf_attr(bAlternateSetting, "%2d\n")
810usb_intf_attr(bNumEndpoints, "%02x\n")
811usb_intf_attr(bInterfaceClass, "%02x\n")
812usb_intf_attr(bInterfaceSubClass, "%02x\n")
813usb_intf_attr(bInterfaceProtocol, "%02x\n")
814
815static ssize_t show_interface_string(struct device *dev,
816 struct device_attribute *attr, char *buf)
817{
818 struct usb_interface *intf;
819 char *string;
820
821 intf = to_usb_interface(dev);
822 string = intf->cur_altsetting->string;
823 barrier(); /* The altsetting might change! */
824
825 if (!string)
826 return 0;
827 return sprintf(buf, "%s\n", string);
828}
829static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
830
831static ssize_t show_modalias(struct device *dev,
832 struct device_attribute *attr, char *buf)
833{
834 struct usb_interface *intf;
835 struct usb_device *udev;
836 struct usb_host_interface *alt;
837
838 intf = to_usb_interface(dev);
839 udev = interface_to_usbdev(intf);
840 alt = intf->cur_altsetting;
841
842 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
843 "ic%02Xisc%02Xip%02X\n",
844 le16_to_cpu(udev->descriptor.idVendor),
845 le16_to_cpu(udev->descriptor.idProduct),
846 le16_to_cpu(udev->descriptor.bcdDevice),
847 udev->descriptor.bDeviceClass,
848 udev->descriptor.bDeviceSubClass,
849 udev->descriptor.bDeviceProtocol,
850 alt->desc.bInterfaceClass,
851 alt->desc.bInterfaceSubClass,
852 alt->desc.bInterfaceProtocol);
853}
854static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
855
856static ssize_t show_supports_autosuspend(struct device *dev,
857 struct device_attribute *attr, char *buf)
858{
859 struct usb_interface *intf;
860 struct usb_device *udev;
861 int ret;
862
863 intf = to_usb_interface(dev);
864 udev = interface_to_usbdev(intf);
865
866 usb_lock_device(udev);
867 /* Devices will be autosuspended even when an interface isn't claimed */
868 if (!intf->dev.driver ||
869 to_usb_driver(intf->dev.driver)->supports_autosuspend)
870 ret = sprintf(buf, "%u\n", 1);
871 else
872 ret = sprintf(buf, "%u\n", 0);
873 usb_unlock_device(udev);
874
875 return ret;
876}
877static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
878
879static struct attribute *intf_attrs[] = {
880 &dev_attr_bInterfaceNumber.attr,
881 &dev_attr_bAlternateSetting.attr,
882 &dev_attr_bNumEndpoints.attr,
883 &dev_attr_bInterfaceClass.attr,
884 &dev_attr_bInterfaceSubClass.attr,
885 &dev_attr_bInterfaceProtocol.attr,
886 &dev_attr_modalias.attr,
887 &dev_attr_supports_autosuspend.attr,
888 NULL,
889};
890static struct attribute_group intf_attr_grp = {
891 .attrs = intf_attrs,
892};
893
894static struct attribute *intf_assoc_attrs[] = {
895 &dev_attr_iad_bFirstInterface.attr,
896 &dev_attr_iad_bInterfaceCount.attr,
897 &dev_attr_iad_bFunctionClass.attr,
898 &dev_attr_iad_bFunctionSubClass.attr,
899 &dev_attr_iad_bFunctionProtocol.attr,
900 NULL,
901};
902
903static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
904 struct attribute *a, int n)
905{
906 struct device *dev = container_of(kobj, struct device, kobj);
907 struct usb_interface *intf = to_usb_interface(dev);
908
909 if (intf->intf_assoc == NULL)
910 return 0;
911 return a->mode;
912}
913
914static struct attribute_group intf_assoc_attr_grp = {
915 .attrs = intf_assoc_attrs,
916 .is_visible = intf_assoc_attrs_are_visible,
917};
918
919const struct attribute_group *usb_interface_groups[] = {
920 &intf_attr_grp,
921 &intf_assoc_attr_grp,
922 NULL
923};
924
925void usb_create_sysfs_intf_files(struct usb_interface *intf)
926{
927 struct usb_device *udev = interface_to_usbdev(intf);
928 struct usb_host_interface *alt = intf->cur_altsetting;
929
930 if (intf->sysfs_files_created || intf->unregistering)
931 return;
932
933 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
934 alt->string = usb_cache_string(udev, alt->desc.iInterface);
935 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface))
936 ; /* We don't actually care if the function fails. */
937 intf->sysfs_files_created = 1;
938}
939
940void usb_remove_sysfs_intf_files(struct usb_interface *intf)
941{
942 if (!intf->sysfs_files_created)
943 return;
944
945 device_remove_file(&intf->dev, &dev_attr_interface);
946 intf->sysfs_files_created = 0;
947}