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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 bool val;
277 int rc;
278
279 if (kstrtobool(buf, &val) != 0)
280 return -EINVAL;
281 rc = usb_lock_device_interruptible(udev);
282 if (rc < 0)
283 return -EINTR;
284 if (val)
285 udev->quirks |= USB_QUIRK_RESET;
286 else
287 udev->quirks &= ~USB_QUIRK_RESET;
288 usb_unlock_device(udev);
289 return count;
290}
291static DEVICE_ATTR_RW(avoid_reset_quirk);
292
293static ssize_t urbnum_show(struct device *dev, struct device_attribute *attr,
294 char *buf)
295{
296 struct usb_device *udev;
297
298 udev = to_usb_device(dev);
299 return sysfs_emit(buf, "%d\n", atomic_read(&udev->urbnum));
300}
301static DEVICE_ATTR_RO(urbnum);
302
303static ssize_t ltm_capable_show(struct device *dev,
304 struct device_attribute *attr, char *buf)
305{
306 if (usb_device_supports_ltm(to_usb_device(dev)))
307 return sysfs_emit(buf, "%s\n", "yes");
308 return sysfs_emit(buf, "%s\n", "no");
309}
310static DEVICE_ATTR_RO(ltm_capable);
311
312#ifdef CONFIG_PM
313
314static ssize_t persist_show(struct device *dev, struct device_attribute *attr,
315 char *buf)
316{
317 struct usb_device *udev = to_usb_device(dev);
318
319 return sysfs_emit(buf, "%d\n", udev->persist_enabled);
320}
321
322static ssize_t persist_store(struct device *dev, struct device_attribute *attr,
323 const char *buf, size_t count)
324{
325 struct usb_device *udev = to_usb_device(dev);
326 bool value;
327 int rc;
328
329 /* Hubs are always enabled for USB_PERSIST */
330 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
331 return -EPERM;
332
333 if (kstrtobool(buf, &value) != 0)
334 return -EINVAL;
335
336 rc = usb_lock_device_interruptible(udev);
337 if (rc < 0)
338 return -EINTR;
339 udev->persist_enabled = !!value;
340 usb_unlock_device(udev);
341 return count;
342}
343static DEVICE_ATTR_RW(persist);
344
345static int add_persist_attributes(struct device *dev)
346{
347 int rc = 0;
348
349 if (is_usb_device(dev)) {
350 struct usb_device *udev = to_usb_device(dev);
351
352 /* Hubs are automatically enabled for USB_PERSIST,
353 * no point in creating the attribute file.
354 */
355 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
356 rc = sysfs_add_file_to_group(&dev->kobj,
357 &dev_attr_persist.attr,
358 power_group_name);
359 }
360 return rc;
361}
362
363static void remove_persist_attributes(struct device *dev)
364{
365 sysfs_remove_file_from_group(&dev->kobj,
366 &dev_attr_persist.attr,
367 power_group_name);
368}
369
370static ssize_t connected_duration_show(struct device *dev,
371 struct device_attribute *attr, char *buf)
372{
373 struct usb_device *udev = to_usb_device(dev);
374
375 return sysfs_emit(buf, "%u\n",
376 jiffies_to_msecs(jiffies - udev->connect_time));
377}
378static DEVICE_ATTR_RO(connected_duration);
379
380/*
381 * If the device is resumed, the last time the device was suspended has
382 * been pre-subtracted from active_duration. We add the current time to
383 * get the duration that the device was actually active.
384 *
385 * If the device is suspended, the active_duration is up-to-date.
386 */
387static ssize_t active_duration_show(struct device *dev,
388 struct device_attribute *attr, char *buf)
389{
390 struct usb_device *udev = to_usb_device(dev);
391 int duration;
392
393 if (udev->state != USB_STATE_SUSPENDED)
394 duration = jiffies_to_msecs(jiffies + udev->active_duration);
395 else
396 duration = jiffies_to_msecs(udev->active_duration);
397 return sysfs_emit(buf, "%u\n", duration);
398}
399static DEVICE_ATTR_RO(active_duration);
400
401static ssize_t autosuspend_show(struct device *dev,
402 struct device_attribute *attr, char *buf)
403{
404 return sysfs_emit(buf, "%d\n", dev->power.autosuspend_delay / 1000);
405}
406
407static ssize_t autosuspend_store(struct device *dev,
408 struct device_attribute *attr, const char *buf,
409 size_t count)
410{
411 int value;
412
413 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
414 value <= -INT_MAX/1000)
415 return -EINVAL;
416
417 pm_runtime_set_autosuspend_delay(dev, value * 1000);
418 return count;
419}
420static DEVICE_ATTR_RW(autosuspend);
421
422static const char on_string[] = "on";
423static const char auto_string[] = "auto";
424
425static void warn_level(void)
426{
427 static int level_warned;
428
429 if (!level_warned) {
430 level_warned = 1;
431 printk(KERN_WARNING "WARNING! power/level is deprecated; "
432 "use power/control instead\n");
433 }
434}
435
436static ssize_t level_show(struct device *dev, struct device_attribute *attr,
437 char *buf)
438{
439 struct usb_device *udev = to_usb_device(dev);
440 const char *p = auto_string;
441
442 warn_level();
443 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
444 p = on_string;
445 return sysfs_emit(buf, "%s\n", p);
446}
447
448static ssize_t level_store(struct device *dev, struct device_attribute *attr,
449 const char *buf, size_t count)
450{
451 struct usb_device *udev = to_usb_device(dev);
452 int len = count;
453 char *cp;
454 int rc = count;
455 int rv;
456
457 warn_level();
458 cp = memchr(buf, '\n', count);
459 if (cp)
460 len = cp - buf;
461
462 rv = usb_lock_device_interruptible(udev);
463 if (rv < 0)
464 return -EINTR;
465
466 if (len == sizeof on_string - 1 &&
467 strncmp(buf, on_string, len) == 0)
468 usb_disable_autosuspend(udev);
469
470 else if (len == sizeof auto_string - 1 &&
471 strncmp(buf, auto_string, len) == 0)
472 usb_enable_autosuspend(udev);
473
474 else
475 rc = -EINVAL;
476
477 usb_unlock_device(udev);
478 return rc;
479}
480static DEVICE_ATTR_RW(level);
481
482static ssize_t usb2_hardware_lpm_show(struct device *dev,
483 struct device_attribute *attr, char *buf)
484{
485 struct usb_device *udev = to_usb_device(dev);
486 const char *p;
487
488 if (udev->usb2_hw_lpm_allowed == 1)
489 p = "enabled";
490 else
491 p = "disabled";
492
493 return sysfs_emit(buf, "%s\n", p);
494}
495
496static ssize_t usb2_hardware_lpm_store(struct device *dev,
497 struct device_attribute *attr,
498 const char *buf, size_t count)
499{
500 struct usb_device *udev = to_usb_device(dev);
501 bool value;
502 int ret;
503
504 ret = usb_lock_device_interruptible(udev);
505 if (ret < 0)
506 return -EINTR;
507
508 ret = kstrtobool(buf, &value);
509
510 if (!ret) {
511 udev->usb2_hw_lpm_allowed = value;
512 if (value)
513 ret = usb_enable_usb2_hardware_lpm(udev);
514 else
515 ret = usb_disable_usb2_hardware_lpm(udev);
516 }
517
518 usb_unlock_device(udev);
519
520 if (!ret)
521 return count;
522
523 return ret;
524}
525static DEVICE_ATTR_RW(usb2_hardware_lpm);
526
527static ssize_t usb2_lpm_l1_timeout_show(struct device *dev,
528 struct device_attribute *attr,
529 char *buf)
530{
531 struct usb_device *udev = to_usb_device(dev);
532 return sysfs_emit(buf, "%d\n", udev->l1_params.timeout);
533}
534
535static ssize_t usb2_lpm_l1_timeout_store(struct device *dev,
536 struct device_attribute *attr,
537 const char *buf, size_t count)
538{
539 struct usb_device *udev = to_usb_device(dev);
540 u16 timeout;
541
542 if (kstrtou16(buf, 0, &timeout))
543 return -EINVAL;
544
545 udev->l1_params.timeout = timeout;
546
547 return count;
548}
549static DEVICE_ATTR_RW(usb2_lpm_l1_timeout);
550
551static ssize_t usb2_lpm_besl_show(struct device *dev,
552 struct device_attribute *attr, char *buf)
553{
554 struct usb_device *udev = to_usb_device(dev);
555 return sysfs_emit(buf, "%d\n", udev->l1_params.besl);
556}
557
558static ssize_t usb2_lpm_besl_store(struct device *dev,
559 struct device_attribute *attr,
560 const char *buf, size_t count)
561{
562 struct usb_device *udev = to_usb_device(dev);
563 u8 besl;
564
565 if (kstrtou8(buf, 0, &besl) || besl > 15)
566 return -EINVAL;
567
568 udev->l1_params.besl = besl;
569
570 return count;
571}
572static DEVICE_ATTR_RW(usb2_lpm_besl);
573
574static ssize_t usb3_hardware_lpm_u1_show(struct device *dev,
575 struct device_attribute *attr, char *buf)
576{
577 struct usb_device *udev = to_usb_device(dev);
578 const char *p;
579 int rc;
580
581 rc = usb_lock_device_interruptible(udev);
582 if (rc < 0)
583 return -EINTR;
584
585 if (udev->usb3_lpm_u1_enabled)
586 p = "enabled";
587 else
588 p = "disabled";
589
590 usb_unlock_device(udev);
591
592 return sysfs_emit(buf, "%s\n", p);
593}
594static DEVICE_ATTR_RO(usb3_hardware_lpm_u1);
595
596static ssize_t usb3_hardware_lpm_u2_show(struct device *dev,
597 struct device_attribute *attr, char *buf)
598{
599 struct usb_device *udev = to_usb_device(dev);
600 const char *p;
601 int rc;
602
603 rc = usb_lock_device_interruptible(udev);
604 if (rc < 0)
605 return -EINTR;
606
607 if (udev->usb3_lpm_u2_enabled)
608 p = "enabled";
609 else
610 p = "disabled";
611
612 usb_unlock_device(udev);
613
614 return sysfs_emit(buf, "%s\n", p);
615}
616static DEVICE_ATTR_RO(usb3_hardware_lpm_u2);
617
618static struct attribute *usb2_hardware_lpm_attr[] = {
619 &dev_attr_usb2_hardware_lpm.attr,
620 &dev_attr_usb2_lpm_l1_timeout.attr,
621 &dev_attr_usb2_lpm_besl.attr,
622 NULL,
623};
624static const struct attribute_group usb2_hardware_lpm_attr_group = {
625 .name = power_group_name,
626 .attrs = usb2_hardware_lpm_attr,
627};
628
629static struct attribute *usb3_hardware_lpm_attr[] = {
630 &dev_attr_usb3_hardware_lpm_u1.attr,
631 &dev_attr_usb3_hardware_lpm_u2.attr,
632 NULL,
633};
634static const struct attribute_group usb3_hardware_lpm_attr_group = {
635 .name = power_group_name,
636 .attrs = usb3_hardware_lpm_attr,
637};
638
639static struct attribute *power_attrs[] = {
640 &dev_attr_autosuspend.attr,
641 &dev_attr_level.attr,
642 &dev_attr_connected_duration.attr,
643 &dev_attr_active_duration.attr,
644 NULL,
645};
646static const struct attribute_group power_attr_group = {
647 .name = power_group_name,
648 .attrs = power_attrs,
649};
650
651static int add_power_attributes(struct device *dev)
652{
653 int rc = 0;
654
655 if (is_usb_device(dev)) {
656 struct usb_device *udev = to_usb_device(dev);
657 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
658 if (udev->usb2_hw_lpm_capable == 1)
659 rc = sysfs_merge_group(&dev->kobj,
660 &usb2_hardware_lpm_attr_group);
661 if ((udev->speed == USB_SPEED_SUPER ||
662 udev->speed == USB_SPEED_SUPER_PLUS) &&
663 udev->lpm_capable == 1)
664 rc = sysfs_merge_group(&dev->kobj,
665 &usb3_hardware_lpm_attr_group);
666 }
667
668 return rc;
669}
670
671static void remove_power_attributes(struct device *dev)
672{
673 sysfs_unmerge_group(&dev->kobj, &usb3_hardware_lpm_attr_group);
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 bool val;
746
747 if (kstrtobool(buf, &val) != 0)
748 result = -EINVAL;
749 else if (val)
750 result = usb_authorize_device(usb_dev);
751 else
752 result = usb_deauthorize_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
853/* Binary descriptors */
854
855static ssize_t
856descriptors_read(struct file *filp, struct kobject *kobj,
857 const struct bin_attribute *attr,
858 char *buf, loff_t off, size_t count)
859{
860 struct device *dev = kobj_to_dev(kobj);
861 struct usb_device *udev = to_usb_device(dev);
862 size_t nleft = count;
863 size_t srclen, n;
864 int cfgno;
865 void *src;
866
867 /* The binary attribute begins with the device descriptor.
868 * Following that are the raw descriptor entries for all the
869 * configurations (config plus subsidiary descriptors).
870 */
871 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
872 nleft > 0; ++cfgno) {
873 if (cfgno < 0) {
874 src = &udev->descriptor;
875 srclen = sizeof(struct usb_device_descriptor);
876 } else {
877 src = udev->rawdescriptors[cfgno];
878 srclen = le16_to_cpu(udev->config[cfgno].desc.
879 wTotalLength);
880 }
881 if (off < srclen) {
882 n = min(nleft, srclen - (size_t) off);
883 memcpy(buf, src + off, n);
884 nleft -= n;
885 buf += n;
886 off = 0;
887 } else {
888 off -= srclen;
889 }
890 }
891 return count - nleft;
892}
893static const BIN_ATTR_RO(descriptors, 18 + 65535); /* dev descr + max-size raw descriptor */
894
895static ssize_t
896bos_descriptors_read(struct file *filp, struct kobject *kobj,
897 const struct bin_attribute *attr,
898 char *buf, loff_t off, size_t count)
899{
900 struct device *dev = kobj_to_dev(kobj);
901 struct usb_device *udev = to_usb_device(dev);
902 struct usb_host_bos *bos;
903 struct usb_bos_descriptor *desc;
904 size_t desclen, n = 0;
905 int rc;
906
907 rc = usb_lock_device_interruptible(udev);
908 if (rc < 0)
909 return -EINTR;
910 bos = udev->bos;
911 if (bos) {
912 desc = bos->desc;
913 desclen = le16_to_cpu(desc->wTotalLength);
914 if (off < desclen) {
915 n = min(count, desclen - (size_t) off);
916 memcpy(buf, (void *) desc + off, n);
917 }
918 }
919 usb_unlock_device(udev);
920 return n;
921}
922static const BIN_ATTR_RO(bos_descriptors, 65535); /* max-size BOS */
923
924/* When modifying this list, be sure to modify dev_bin_attrs_are_visible()
925 * accordingly.
926 */
927static const struct bin_attribute *const dev_bin_attrs[] = {
928 &bin_attr_descriptors,
929 &bin_attr_bos_descriptors,
930 NULL
931};
932
933static umode_t dev_bin_attrs_are_visible(struct kobject *kobj,
934 const struct bin_attribute *a, int n)
935{
936 struct device *dev = kobj_to_dev(kobj);
937 struct usb_device *udev = to_usb_device(dev);
938
939 /*
940 * There's no need to check if the descriptors attribute should
941 * be visible because all devices have a device descriptor. The
942 * bos_descriptors attribute should be visible if and only if
943 * the device has a BOS, so check if it exists here.
944 */
945 if (a == &bin_attr_bos_descriptors) {
946 if (udev->bos == NULL)
947 return 0;
948 }
949 return a->attr.mode;
950}
951
952static const struct attribute_group dev_bin_attr_grp = {
953 .bin_attrs = dev_bin_attrs,
954 .is_bin_visible = dev_bin_attrs_are_visible,
955};
956
957const struct attribute_group *usb_device_groups[] = {
958 &dev_attr_grp,
959 &dev_string_attr_grp,
960 &dev_bin_attr_grp,
961 NULL
962};
963
964/*
965 * Show & store the current value of authorized_default
966 */
967static ssize_t authorized_default_show(struct device *dev,
968 struct device_attribute *attr, char *buf)
969{
970 struct usb_device *rh_usb_dev = to_usb_device(dev);
971 struct usb_bus *usb_bus = rh_usb_dev->bus;
972 struct usb_hcd *hcd;
973
974 hcd = bus_to_hcd(usb_bus);
975 return sysfs_emit(buf, "%u\n", hcd->dev_policy);
976}
977
978static ssize_t authorized_default_store(struct device *dev,
979 struct device_attribute *attr,
980 const char *buf, size_t size)
981{
982 ssize_t result;
983 unsigned int val;
984 struct usb_device *rh_usb_dev = to_usb_device(dev);
985 struct usb_bus *usb_bus = rh_usb_dev->bus;
986 struct usb_hcd *hcd;
987
988 hcd = bus_to_hcd(usb_bus);
989 result = sscanf(buf, "%u\n", &val);
990 if (result == 1) {
991 hcd->dev_policy = val <= USB_DEVICE_AUTHORIZE_INTERNAL ?
992 val : USB_DEVICE_AUTHORIZE_ALL;
993 result = size;
994 } else {
995 result = -EINVAL;
996 }
997 return result;
998}
999static DEVICE_ATTR_RW(authorized_default);
1000
1001/*
1002 * interface_authorized_default_show - show default authorization status
1003 * for USB interfaces
1004 *
1005 * note: interface_authorized_default is the default value
1006 * for initializing the authorized attribute of interfaces
1007 */
1008static ssize_t interface_authorized_default_show(struct device *dev,
1009 struct device_attribute *attr, char *buf)
1010{
1011 struct usb_device *usb_dev = to_usb_device(dev);
1012 struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
1013
1014 return sysfs_emit(buf, "%u\n", !!HCD_INTF_AUTHORIZED(hcd));
1015}
1016
1017/*
1018 * interface_authorized_default_store - store default authorization status
1019 * for USB interfaces
1020 *
1021 * note: interface_authorized_default is the default value
1022 * for initializing the authorized attribute of interfaces
1023 */
1024static ssize_t interface_authorized_default_store(struct device *dev,
1025 struct device_attribute *attr, const char *buf, size_t count)
1026{
1027 struct usb_device *usb_dev = to_usb_device(dev);
1028 struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
1029 int rc = count;
1030 bool val;
1031
1032 if (kstrtobool(buf, &val) != 0)
1033 return -EINVAL;
1034
1035 if (val)
1036 set_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
1037 else
1038 clear_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
1039
1040 return rc;
1041}
1042static DEVICE_ATTR_RW(interface_authorized_default);
1043
1044/* Group all the USB bus attributes */
1045static struct attribute *usb_bus_attrs[] = {
1046 &dev_attr_authorized_default.attr,
1047 &dev_attr_interface_authorized_default.attr,
1048 NULL,
1049};
1050
1051static const struct attribute_group usb_bus_attr_group = {
1052 .name = NULL, /* we want them in the same directory */
1053 .attrs = usb_bus_attrs,
1054};
1055
1056
1057static int add_default_authorized_attributes(struct device *dev)
1058{
1059 int rc = 0;
1060
1061 if (is_usb_device(dev))
1062 rc = sysfs_create_group(&dev->kobj, &usb_bus_attr_group);
1063
1064 return rc;
1065}
1066
1067static void remove_default_authorized_attributes(struct device *dev)
1068{
1069 if (is_usb_device(dev)) {
1070 sysfs_remove_group(&dev->kobj, &usb_bus_attr_group);
1071 }
1072}
1073
1074int usb_create_sysfs_dev_files(struct usb_device *udev)
1075{
1076 struct device *dev = &udev->dev;
1077 int retval;
1078
1079 retval = add_persist_attributes(dev);
1080 if (retval)
1081 goto error;
1082
1083 retval = add_power_attributes(dev);
1084 if (retval)
1085 goto error;
1086
1087 if (is_root_hub(udev)) {
1088 retval = add_default_authorized_attributes(dev);
1089 if (retval)
1090 goto error;
1091 }
1092 return retval;
1093
1094error:
1095 usb_remove_sysfs_dev_files(udev);
1096 return retval;
1097}
1098
1099void usb_remove_sysfs_dev_files(struct usb_device *udev)
1100{
1101 struct device *dev = &udev->dev;
1102
1103 if (is_root_hub(udev))
1104 remove_default_authorized_attributes(dev);
1105
1106 remove_power_attributes(dev);
1107 remove_persist_attributes(dev);
1108}
1109
1110/* Interface Association Descriptor fields */
1111#define usb_intf_assoc_attr(field, format_string) \
1112static ssize_t \
1113iad_##field##_show(struct device *dev, struct device_attribute *attr, \
1114 char *buf) \
1115{ \
1116 struct usb_interface *intf = to_usb_interface(dev); \
1117 \
1118 return sysfs_emit(buf, format_string, \
1119 intf->intf_assoc->field); \
1120} \
1121static DEVICE_ATTR_RO(iad_##field)
1122
1123usb_intf_assoc_attr(bFirstInterface, "%02x\n");
1124usb_intf_assoc_attr(bInterfaceCount, "%02d\n");
1125usb_intf_assoc_attr(bFunctionClass, "%02x\n");
1126usb_intf_assoc_attr(bFunctionSubClass, "%02x\n");
1127usb_intf_assoc_attr(bFunctionProtocol, "%02x\n");
1128
1129/* Interface fields */
1130#define usb_intf_attr(field, format_string) \
1131static ssize_t \
1132field##_show(struct device *dev, struct device_attribute *attr, \
1133 char *buf) \
1134{ \
1135 struct usb_interface *intf = to_usb_interface(dev); \
1136 \
1137 return sysfs_emit(buf, format_string, \
1138 intf->cur_altsetting->desc.field); \
1139} \
1140static DEVICE_ATTR_RO(field)
1141
1142usb_intf_attr(bInterfaceNumber, "%02x\n");
1143usb_intf_attr(bAlternateSetting, "%2d\n");
1144usb_intf_attr(bNumEndpoints, "%02x\n");
1145usb_intf_attr(bInterfaceClass, "%02x\n");
1146usb_intf_attr(bInterfaceSubClass, "%02x\n");
1147usb_intf_attr(bInterfaceProtocol, "%02x\n");
1148
1149static ssize_t interface_show(struct device *dev, struct device_attribute *attr,
1150 char *buf)
1151{
1152 struct usb_interface *intf;
1153 char *string;
1154
1155 intf = to_usb_interface(dev);
1156 string = READ_ONCE(intf->cur_altsetting->string);
1157 if (!string)
1158 return 0;
1159 return sysfs_emit(buf, "%s\n", string);
1160}
1161static DEVICE_ATTR_RO(interface);
1162
1163static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
1164 char *buf)
1165{
1166 struct usb_interface *intf;
1167 struct usb_device *udev;
1168 struct usb_host_interface *alt;
1169
1170 intf = to_usb_interface(dev);
1171 udev = interface_to_usbdev(intf);
1172 alt = READ_ONCE(intf->cur_altsetting);
1173
1174 return sysfs_emit(buf,
1175 "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
1176 "ic%02Xisc%02Xip%02Xin%02X\n",
1177 le16_to_cpu(udev->descriptor.idVendor),
1178 le16_to_cpu(udev->descriptor.idProduct),
1179 le16_to_cpu(udev->descriptor.bcdDevice),
1180 udev->descriptor.bDeviceClass,
1181 udev->descriptor.bDeviceSubClass,
1182 udev->descriptor.bDeviceProtocol,
1183 alt->desc.bInterfaceClass,
1184 alt->desc.bInterfaceSubClass,
1185 alt->desc.bInterfaceProtocol,
1186 alt->desc.bInterfaceNumber);
1187}
1188static DEVICE_ATTR_RO(modalias);
1189
1190static ssize_t supports_autosuspend_show(struct device *dev,
1191 struct device_attribute *attr,
1192 char *buf)
1193{
1194 int s;
1195
1196 s = device_lock_interruptible(dev);
1197 if (s < 0)
1198 return -EINTR;
1199 /* Devices will be autosuspended even when an interface isn't claimed */
1200 s = (!dev->driver || to_usb_driver(dev->driver)->supports_autosuspend);
1201 device_unlock(dev);
1202
1203 return sysfs_emit(buf, "%u\n", s);
1204}
1205static DEVICE_ATTR_RO(supports_autosuspend);
1206
1207/*
1208 * interface_authorized_show - show authorization status of an USB interface
1209 * 1 is authorized, 0 is deauthorized
1210 */
1211static ssize_t interface_authorized_show(struct device *dev,
1212 struct device_attribute *attr, char *buf)
1213{
1214 struct usb_interface *intf = to_usb_interface(dev);
1215
1216 return sysfs_emit(buf, "%u\n", intf->authorized);
1217}
1218
1219/*
1220 * interface_authorized_store - authorize or deauthorize an USB interface
1221 */
1222static ssize_t interface_authorized_store(struct device *dev,
1223 struct device_attribute *attr, const char *buf, size_t count)
1224{
1225 struct usb_interface *intf = to_usb_interface(dev);
1226 bool val;
1227 struct kernfs_node *kn;
1228
1229 if (kstrtobool(buf, &val) != 0)
1230 return -EINVAL;
1231
1232 if (val) {
1233 usb_authorize_interface(intf);
1234 } else {
1235 /*
1236 * Prevent deadlock if another process is concurrently
1237 * trying to unregister intf.
1238 */
1239 kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
1240 if (kn) {
1241 usb_deauthorize_interface(intf);
1242 sysfs_unbreak_active_protection(kn);
1243 }
1244 }
1245
1246 return count;
1247}
1248static struct device_attribute dev_attr_interface_authorized =
1249 __ATTR(authorized, S_IRUGO | S_IWUSR,
1250 interface_authorized_show, interface_authorized_store);
1251
1252static struct attribute *intf_attrs[] = {
1253 &dev_attr_bInterfaceNumber.attr,
1254 &dev_attr_bAlternateSetting.attr,
1255 &dev_attr_bNumEndpoints.attr,
1256 &dev_attr_bInterfaceClass.attr,
1257 &dev_attr_bInterfaceSubClass.attr,
1258 &dev_attr_bInterfaceProtocol.attr,
1259 &dev_attr_modalias.attr,
1260 &dev_attr_supports_autosuspend.attr,
1261 &dev_attr_interface_authorized.attr,
1262 NULL,
1263};
1264static const struct attribute_group intf_attr_grp = {
1265 .attrs = intf_attrs,
1266};
1267
1268static struct attribute *intf_assoc_attrs[] = {
1269 &dev_attr_iad_bFirstInterface.attr,
1270 &dev_attr_iad_bInterfaceCount.attr,
1271 &dev_attr_iad_bFunctionClass.attr,
1272 &dev_attr_iad_bFunctionSubClass.attr,
1273 &dev_attr_iad_bFunctionProtocol.attr,
1274 NULL,
1275};
1276
1277static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
1278 struct attribute *a, int n)
1279{
1280 struct device *dev = kobj_to_dev(kobj);
1281 struct usb_interface *intf = to_usb_interface(dev);
1282
1283 if (intf->intf_assoc == NULL)
1284 return 0;
1285 return a->mode;
1286}
1287
1288static const struct attribute_group intf_assoc_attr_grp = {
1289 .attrs = intf_assoc_attrs,
1290 .is_visible = intf_assoc_attrs_are_visible,
1291};
1292
1293static ssize_t wireless_status_show(struct device *dev,
1294 struct device_attribute *attr, char *buf)
1295{
1296 struct usb_interface *intf;
1297
1298 intf = to_usb_interface(dev);
1299 if (intf->wireless_status == USB_WIRELESS_STATUS_DISCONNECTED)
1300 return sysfs_emit(buf, "%s\n", "disconnected");
1301 return sysfs_emit(buf, "%s\n", "connected");
1302}
1303static DEVICE_ATTR_RO(wireless_status);
1304
1305static struct attribute *intf_wireless_status_attrs[] = {
1306 &dev_attr_wireless_status.attr,
1307 NULL
1308};
1309
1310static umode_t intf_wireless_status_attr_is_visible(struct kobject *kobj,
1311 struct attribute *a, int n)
1312{
1313 struct device *dev = kobj_to_dev(kobj);
1314 struct usb_interface *intf = to_usb_interface(dev);
1315
1316 if (a != &dev_attr_wireless_status.attr ||
1317 intf->wireless_status != USB_WIRELESS_STATUS_NA)
1318 return a->mode;
1319 return 0;
1320}
1321
1322static const struct attribute_group intf_wireless_status_attr_grp = {
1323 .attrs = intf_wireless_status_attrs,
1324 .is_visible = intf_wireless_status_attr_is_visible,
1325};
1326
1327int usb_update_wireless_status_attr(struct usb_interface *intf)
1328{
1329 struct device *dev = &intf->dev;
1330 int ret;
1331
1332 ret = sysfs_update_group(&dev->kobj, &intf_wireless_status_attr_grp);
1333 if (ret < 0)
1334 return ret;
1335
1336 sysfs_notify(&dev->kobj, NULL, "wireless_status");
1337 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
1338
1339 return 0;
1340}
1341
1342const struct attribute_group *usb_interface_groups[] = {
1343 &intf_attr_grp,
1344 &intf_assoc_attr_grp,
1345 &intf_wireless_status_attr_grp,
1346 NULL
1347};
1348
1349void usb_create_sysfs_intf_files(struct usb_interface *intf)
1350{
1351 struct usb_device *udev = interface_to_usbdev(intf);
1352 struct usb_host_interface *alt = intf->cur_altsetting;
1353
1354 if (intf->sysfs_files_created || intf->unregistering)
1355 return;
1356
1357 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
1358 alt->string = usb_cache_string(udev, alt->desc.iInterface);
1359 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface)) {
1360 /* This is not a serious error */
1361 dev_dbg(&intf->dev, "interface string descriptor file not created\n");
1362 }
1363 intf->sysfs_files_created = 1;
1364}
1365
1366void usb_remove_sysfs_intf_files(struct usb_interface *intf)
1367{
1368 if (!intf->sysfs_files_created)
1369 return;
1370
1371 device_remove_file(&intf->dev, &dev_attr_interface);
1372 intf->sysfs_files_created = 0;
1373}