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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 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 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 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 = udev->bos;
903 struct usb_bos_descriptor *desc;
904 size_t desclen, n = 0;
905
906 if (bos) {
907 desc = bos->desc;
908 desclen = le16_to_cpu(desc->wTotalLength);
909 if (off < desclen) {
910 n = min(count, desclen - (size_t) off);
911 memcpy(buf, (void *) desc + off, n);
912 }
913 }
914 return n;
915}
916static BIN_ATTR_RO(bos_descriptors, 65535); /* max-size BOS */
917
918/* When modifying this list, be sure to modify dev_bin_attrs_are_visible()
919 * accordingly.
920 */
921static struct bin_attribute *dev_bin_attrs[] = {
922 &bin_attr_descriptors,
923 &bin_attr_bos_descriptors,
924 NULL
925};
926
927static umode_t dev_bin_attrs_are_visible(struct kobject *kobj,
928 const struct bin_attribute *a, int n)
929{
930 struct device *dev = kobj_to_dev(kobj);
931 struct usb_device *udev = to_usb_device(dev);
932
933 /*
934 * There's no need to check if the descriptors attribute should
935 * be visible because all devices have a device descriptor. The
936 * bos_descriptors attribute should be visible if and only if
937 * the device has a BOS, so check if it exists here.
938 */
939 if (a == &bin_attr_bos_descriptors) {
940 if (udev->bos == NULL)
941 return 0;
942 }
943 return a->attr.mode;
944}
945
946static const struct attribute_group dev_bin_attr_grp = {
947 .bin_attrs = dev_bin_attrs,
948 .is_bin_visible = dev_bin_attrs_are_visible,
949};
950
951const struct attribute_group *usb_device_groups[] = {
952 &dev_attr_grp,
953 &dev_string_attr_grp,
954 &dev_bin_attr_grp,
955 NULL
956};
957
958/*
959 * Show & store the current value of authorized_default
960 */
961static ssize_t authorized_default_show(struct device *dev,
962 struct device_attribute *attr, char *buf)
963{
964 struct usb_device *rh_usb_dev = to_usb_device(dev);
965 struct usb_bus *usb_bus = rh_usb_dev->bus;
966 struct usb_hcd *hcd;
967
968 hcd = bus_to_hcd(usb_bus);
969 return sysfs_emit(buf, "%u\n", hcd->dev_policy);
970}
971
972static ssize_t authorized_default_store(struct device *dev,
973 struct device_attribute *attr,
974 const char *buf, size_t size)
975{
976 ssize_t result;
977 unsigned int val;
978 struct usb_device *rh_usb_dev = to_usb_device(dev);
979 struct usb_bus *usb_bus = rh_usb_dev->bus;
980 struct usb_hcd *hcd;
981
982 hcd = bus_to_hcd(usb_bus);
983 result = sscanf(buf, "%u\n", &val);
984 if (result == 1) {
985 hcd->dev_policy = val <= USB_DEVICE_AUTHORIZE_INTERNAL ?
986 val : USB_DEVICE_AUTHORIZE_ALL;
987 result = size;
988 } else {
989 result = -EINVAL;
990 }
991 return result;
992}
993static DEVICE_ATTR_RW(authorized_default);
994
995/*
996 * interface_authorized_default_show - show default authorization status
997 * for USB interfaces
998 *
999 * note: interface_authorized_default is the default value
1000 * for initializing the authorized attribute of interfaces
1001 */
1002static ssize_t interface_authorized_default_show(struct device *dev,
1003 struct device_attribute *attr, char *buf)
1004{
1005 struct usb_device *usb_dev = to_usb_device(dev);
1006 struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
1007
1008 return sysfs_emit(buf, "%u\n", !!HCD_INTF_AUTHORIZED(hcd));
1009}
1010
1011/*
1012 * interface_authorized_default_store - store default authorization status
1013 * for USB interfaces
1014 *
1015 * note: interface_authorized_default is the default value
1016 * for initializing the authorized attribute of interfaces
1017 */
1018static ssize_t interface_authorized_default_store(struct device *dev,
1019 struct device_attribute *attr, const char *buf, size_t count)
1020{
1021 struct usb_device *usb_dev = to_usb_device(dev);
1022 struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
1023 int rc = count;
1024 bool val;
1025
1026 if (kstrtobool(buf, &val) != 0)
1027 return -EINVAL;
1028
1029 if (val)
1030 set_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
1031 else
1032 clear_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
1033
1034 return rc;
1035}
1036static DEVICE_ATTR_RW(interface_authorized_default);
1037
1038/* Group all the USB bus attributes */
1039static struct attribute *usb_bus_attrs[] = {
1040 &dev_attr_authorized_default.attr,
1041 &dev_attr_interface_authorized_default.attr,
1042 NULL,
1043};
1044
1045static const struct attribute_group usb_bus_attr_group = {
1046 .name = NULL, /* we want them in the same directory */
1047 .attrs = usb_bus_attrs,
1048};
1049
1050
1051static int add_default_authorized_attributes(struct device *dev)
1052{
1053 int rc = 0;
1054
1055 if (is_usb_device(dev))
1056 rc = sysfs_create_group(&dev->kobj, &usb_bus_attr_group);
1057
1058 return rc;
1059}
1060
1061static void remove_default_authorized_attributes(struct device *dev)
1062{
1063 if (is_usb_device(dev)) {
1064 sysfs_remove_group(&dev->kobj, &usb_bus_attr_group);
1065 }
1066}
1067
1068int usb_create_sysfs_dev_files(struct usb_device *udev)
1069{
1070 struct device *dev = &udev->dev;
1071 int retval;
1072
1073 retval = add_persist_attributes(dev);
1074 if (retval)
1075 goto error;
1076
1077 retval = add_power_attributes(dev);
1078 if (retval)
1079 goto error;
1080
1081 if (is_root_hub(udev)) {
1082 retval = add_default_authorized_attributes(dev);
1083 if (retval)
1084 goto error;
1085 }
1086 return retval;
1087
1088error:
1089 usb_remove_sysfs_dev_files(udev);
1090 return retval;
1091}
1092
1093void usb_remove_sysfs_dev_files(struct usb_device *udev)
1094{
1095 struct device *dev = &udev->dev;
1096
1097 if (is_root_hub(udev))
1098 remove_default_authorized_attributes(dev);
1099
1100 remove_power_attributes(dev);
1101 remove_persist_attributes(dev);
1102}
1103
1104/* Interface Association Descriptor fields */
1105#define usb_intf_assoc_attr(field, format_string) \
1106static ssize_t \
1107iad_##field##_show(struct device *dev, struct device_attribute *attr, \
1108 char *buf) \
1109{ \
1110 struct usb_interface *intf = to_usb_interface(dev); \
1111 \
1112 return sysfs_emit(buf, format_string, \
1113 intf->intf_assoc->field); \
1114} \
1115static DEVICE_ATTR_RO(iad_##field)
1116
1117usb_intf_assoc_attr(bFirstInterface, "%02x\n");
1118usb_intf_assoc_attr(bInterfaceCount, "%02d\n");
1119usb_intf_assoc_attr(bFunctionClass, "%02x\n");
1120usb_intf_assoc_attr(bFunctionSubClass, "%02x\n");
1121usb_intf_assoc_attr(bFunctionProtocol, "%02x\n");
1122
1123/* Interface fields */
1124#define usb_intf_attr(field, format_string) \
1125static ssize_t \
1126field##_show(struct device *dev, struct device_attribute *attr, \
1127 char *buf) \
1128{ \
1129 struct usb_interface *intf = to_usb_interface(dev); \
1130 \
1131 return sysfs_emit(buf, format_string, \
1132 intf->cur_altsetting->desc.field); \
1133} \
1134static DEVICE_ATTR_RO(field)
1135
1136usb_intf_attr(bInterfaceNumber, "%02x\n");
1137usb_intf_attr(bAlternateSetting, "%2d\n");
1138usb_intf_attr(bNumEndpoints, "%02x\n");
1139usb_intf_attr(bInterfaceClass, "%02x\n");
1140usb_intf_attr(bInterfaceSubClass, "%02x\n");
1141usb_intf_attr(bInterfaceProtocol, "%02x\n");
1142
1143static ssize_t interface_show(struct device *dev, struct device_attribute *attr,
1144 char *buf)
1145{
1146 struct usb_interface *intf;
1147 char *string;
1148
1149 intf = to_usb_interface(dev);
1150 string = READ_ONCE(intf->cur_altsetting->string);
1151 if (!string)
1152 return 0;
1153 return sysfs_emit(buf, "%s\n", string);
1154}
1155static DEVICE_ATTR_RO(interface);
1156
1157static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
1158 char *buf)
1159{
1160 struct usb_interface *intf;
1161 struct usb_device *udev;
1162 struct usb_host_interface *alt;
1163
1164 intf = to_usb_interface(dev);
1165 udev = interface_to_usbdev(intf);
1166 alt = READ_ONCE(intf->cur_altsetting);
1167
1168 return sysfs_emit(buf,
1169 "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
1170 "ic%02Xisc%02Xip%02Xin%02X\n",
1171 le16_to_cpu(udev->descriptor.idVendor),
1172 le16_to_cpu(udev->descriptor.idProduct),
1173 le16_to_cpu(udev->descriptor.bcdDevice),
1174 udev->descriptor.bDeviceClass,
1175 udev->descriptor.bDeviceSubClass,
1176 udev->descriptor.bDeviceProtocol,
1177 alt->desc.bInterfaceClass,
1178 alt->desc.bInterfaceSubClass,
1179 alt->desc.bInterfaceProtocol,
1180 alt->desc.bInterfaceNumber);
1181}
1182static DEVICE_ATTR_RO(modalias);
1183
1184static ssize_t supports_autosuspend_show(struct device *dev,
1185 struct device_attribute *attr,
1186 char *buf)
1187{
1188 int s;
1189
1190 s = device_lock_interruptible(dev);
1191 if (s < 0)
1192 return -EINTR;
1193 /* Devices will be autosuspended even when an interface isn't claimed */
1194 s = (!dev->driver || to_usb_driver(dev->driver)->supports_autosuspend);
1195 device_unlock(dev);
1196
1197 return sysfs_emit(buf, "%u\n", s);
1198}
1199static DEVICE_ATTR_RO(supports_autosuspend);
1200
1201/*
1202 * interface_authorized_show - show authorization status of an USB interface
1203 * 1 is authorized, 0 is deauthorized
1204 */
1205static ssize_t interface_authorized_show(struct device *dev,
1206 struct device_attribute *attr, char *buf)
1207{
1208 struct usb_interface *intf = to_usb_interface(dev);
1209
1210 return sysfs_emit(buf, "%u\n", intf->authorized);
1211}
1212
1213/*
1214 * interface_authorized_store - authorize or deauthorize an USB interface
1215 */
1216static ssize_t interface_authorized_store(struct device *dev,
1217 struct device_attribute *attr, const char *buf, size_t count)
1218{
1219 struct usb_interface *intf = to_usb_interface(dev);
1220 bool val;
1221 struct kernfs_node *kn;
1222
1223 if (kstrtobool(buf, &val) != 0)
1224 return -EINVAL;
1225
1226 if (val) {
1227 usb_authorize_interface(intf);
1228 } else {
1229 /*
1230 * Prevent deadlock if another process is concurrently
1231 * trying to unregister intf.
1232 */
1233 kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
1234 if (kn) {
1235 usb_deauthorize_interface(intf);
1236 sysfs_unbreak_active_protection(kn);
1237 }
1238 }
1239
1240 return count;
1241}
1242static struct device_attribute dev_attr_interface_authorized =
1243 __ATTR(authorized, S_IRUGO | S_IWUSR,
1244 interface_authorized_show, interface_authorized_store);
1245
1246static struct attribute *intf_attrs[] = {
1247 &dev_attr_bInterfaceNumber.attr,
1248 &dev_attr_bAlternateSetting.attr,
1249 &dev_attr_bNumEndpoints.attr,
1250 &dev_attr_bInterfaceClass.attr,
1251 &dev_attr_bInterfaceSubClass.attr,
1252 &dev_attr_bInterfaceProtocol.attr,
1253 &dev_attr_modalias.attr,
1254 &dev_attr_supports_autosuspend.attr,
1255 &dev_attr_interface_authorized.attr,
1256 NULL,
1257};
1258static const struct attribute_group intf_attr_grp = {
1259 .attrs = intf_attrs,
1260};
1261
1262static struct attribute *intf_assoc_attrs[] = {
1263 &dev_attr_iad_bFirstInterface.attr,
1264 &dev_attr_iad_bInterfaceCount.attr,
1265 &dev_attr_iad_bFunctionClass.attr,
1266 &dev_attr_iad_bFunctionSubClass.attr,
1267 &dev_attr_iad_bFunctionProtocol.attr,
1268 NULL,
1269};
1270
1271static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
1272 struct attribute *a, int n)
1273{
1274 struct device *dev = kobj_to_dev(kobj);
1275 struct usb_interface *intf = to_usb_interface(dev);
1276
1277 if (intf->intf_assoc == NULL)
1278 return 0;
1279 return a->mode;
1280}
1281
1282static const struct attribute_group intf_assoc_attr_grp = {
1283 .attrs = intf_assoc_attrs,
1284 .is_visible = intf_assoc_attrs_are_visible,
1285};
1286
1287static ssize_t wireless_status_show(struct device *dev,
1288 struct device_attribute *attr, char *buf)
1289{
1290 struct usb_interface *intf;
1291
1292 intf = to_usb_interface(dev);
1293 if (intf->wireless_status == USB_WIRELESS_STATUS_DISCONNECTED)
1294 return sysfs_emit(buf, "%s\n", "disconnected");
1295 return sysfs_emit(buf, "%s\n", "connected");
1296}
1297static DEVICE_ATTR_RO(wireless_status);
1298
1299static struct attribute *intf_wireless_status_attrs[] = {
1300 &dev_attr_wireless_status.attr,
1301 NULL
1302};
1303
1304static umode_t intf_wireless_status_attr_is_visible(struct kobject *kobj,
1305 struct attribute *a, int n)
1306{
1307 struct device *dev = kobj_to_dev(kobj);
1308 struct usb_interface *intf = to_usb_interface(dev);
1309
1310 if (a != &dev_attr_wireless_status.attr ||
1311 intf->wireless_status != USB_WIRELESS_STATUS_NA)
1312 return a->mode;
1313 return 0;
1314}
1315
1316static const struct attribute_group intf_wireless_status_attr_grp = {
1317 .attrs = intf_wireless_status_attrs,
1318 .is_visible = intf_wireless_status_attr_is_visible,
1319};
1320
1321int usb_update_wireless_status_attr(struct usb_interface *intf)
1322{
1323 struct device *dev = &intf->dev;
1324 int ret;
1325
1326 ret = sysfs_update_group(&dev->kobj, &intf_wireless_status_attr_grp);
1327 if (ret < 0)
1328 return ret;
1329
1330 sysfs_notify(&dev->kobj, NULL, "wireless_status");
1331 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
1332
1333 return 0;
1334}
1335
1336const struct attribute_group *usb_interface_groups[] = {
1337 &intf_attr_grp,
1338 &intf_assoc_attr_grp,
1339 &intf_wireless_status_attr_grp,
1340 NULL
1341};
1342
1343void usb_create_sysfs_intf_files(struct usb_interface *intf)
1344{
1345 struct usb_device *udev = interface_to_usbdev(intf);
1346 struct usb_host_interface *alt = intf->cur_altsetting;
1347
1348 if (intf->sysfs_files_created || intf->unregistering)
1349 return;
1350
1351 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
1352 alt->string = usb_cache_string(udev, alt->desc.iInterface);
1353 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface)) {
1354 /* This is not a serious error */
1355 dev_dbg(&intf->dev, "interface string descriptor file not created\n");
1356 }
1357 intf->sysfs_files_created = 1;
1358}
1359
1360void usb_remove_sysfs_intf_files(struct usb_interface *intf)
1361{
1362 if (!intf->sysfs_files_created)
1363 return;
1364
1365 device_remove_file(&intf->dev, &dev_attr_interface);
1366 intf->sysfs_files_created = 0;
1367}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * drivers/usb/core/sysfs.c
4 *
5 * (C) Copyright 2002 David Brownell
6 * (C) Copyright 2002,2004 Greg Kroah-Hartman
7 * (C) Copyright 2002,2004 IBM Corp.
8 *
9 * All of the sysfs file attributes for usb devices and interfaces.
10 *
11 * Released under the GPLv2 only.
12 */
13
14
15#include <linux/kernel.h>
16#include <linux/kstrtox.h>
17#include <linux/string.h>
18#include <linux/usb.h>
19#include <linux/usb/hcd.h>
20#include <linux/usb/quirks.h>
21#include <linux/of.h>
22#include "usb.h"
23
24/* Active configuration fields */
25#define usb_actconfig_show(field, format_string) \
26static ssize_t field##_show(struct device *dev, \
27 struct device_attribute *attr, char *buf) \
28{ \
29 struct usb_device *udev; \
30 struct usb_host_config *actconfig; \
31 ssize_t rc; \
32 \
33 udev = to_usb_device(dev); \
34 rc = usb_lock_device_interruptible(udev); \
35 if (rc < 0) \
36 return -EINTR; \
37 actconfig = udev->actconfig; \
38 if (actconfig) \
39 rc = sysfs_emit(buf, format_string, \
40 actconfig->desc.field); \
41 usb_unlock_device(udev); \
42 return rc; \
43} \
44
45#define usb_actconfig_attr(field, format_string) \
46 usb_actconfig_show(field, format_string) \
47 static DEVICE_ATTR_RO(field)
48
49usb_actconfig_attr(bNumInterfaces, "%2d\n");
50usb_actconfig_attr(bmAttributes, "%2x\n");
51
52static ssize_t bMaxPower_show(struct device *dev,
53 struct device_attribute *attr, char *buf)
54{
55 struct usb_device *udev;
56 struct usb_host_config *actconfig;
57 ssize_t rc;
58
59 udev = to_usb_device(dev);
60 rc = usb_lock_device_interruptible(udev);
61 if (rc < 0)
62 return -EINTR;
63 actconfig = udev->actconfig;
64 if (actconfig)
65 rc = sysfs_emit(buf, "%dmA\n", usb_get_max_power(udev, actconfig));
66 usb_unlock_device(udev);
67 return rc;
68}
69static DEVICE_ATTR_RO(bMaxPower);
70
71static ssize_t configuration_show(struct device *dev,
72 struct device_attribute *attr, char *buf)
73{
74 struct usb_device *udev;
75 struct usb_host_config *actconfig;
76 ssize_t rc;
77
78 udev = to_usb_device(dev);
79 rc = usb_lock_device_interruptible(udev);
80 if (rc < 0)
81 return -EINTR;
82 actconfig = udev->actconfig;
83 if (actconfig && actconfig->string)
84 rc = sysfs_emit(buf, "%s\n", actconfig->string);
85 usb_unlock_device(udev);
86 return rc;
87}
88static DEVICE_ATTR_RO(configuration);
89
90/* configuration value is always present, and r/w */
91usb_actconfig_show(bConfigurationValue, "%u\n");
92
93static ssize_t bConfigurationValue_store(struct device *dev,
94 struct device_attribute *attr,
95 const char *buf, size_t count)
96{
97 struct usb_device *udev = to_usb_device(dev);
98 int config, value, rc;
99
100 if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
101 return -EINVAL;
102 rc = usb_lock_device_interruptible(udev);
103 if (rc < 0)
104 return -EINTR;
105 value = usb_set_configuration(udev, config);
106 usb_unlock_device(udev);
107 return (value < 0) ? value : count;
108}
109static DEVICE_ATTR_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,
110 bConfigurationValue_show, bConfigurationValue_store);
111
112#ifdef CONFIG_OF
113static ssize_t devspec_show(struct device *dev, struct device_attribute *attr,
114 char *buf)
115{
116 struct device_node *of_node = dev->of_node;
117
118 return sysfs_emit(buf, "%pOF\n", of_node);
119}
120static DEVICE_ATTR_RO(devspec);
121#endif
122
123/* String fields */
124#define usb_string_attr(name) \
125static ssize_t name##_show(struct device *dev, \
126 struct device_attribute *attr, char *buf) \
127{ \
128 struct usb_device *udev; \
129 int retval; \
130 \
131 udev = to_usb_device(dev); \
132 retval = usb_lock_device_interruptible(udev); \
133 if (retval < 0) \
134 return -EINTR; \
135 retval = sysfs_emit(buf, "%s\n", udev->name); \
136 usb_unlock_device(udev); \
137 return retval; \
138} \
139static DEVICE_ATTR_RO(name)
140
141usb_string_attr(product);
142usb_string_attr(manufacturer);
143usb_string_attr(serial);
144
145static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
146 char *buf)
147{
148 struct usb_device *udev;
149 char *speed;
150
151 udev = to_usb_device(dev);
152
153 switch (udev->speed) {
154 case USB_SPEED_LOW:
155 speed = "1.5";
156 break;
157 case USB_SPEED_UNKNOWN:
158 case USB_SPEED_FULL:
159 speed = "12";
160 break;
161 case USB_SPEED_HIGH:
162 speed = "480";
163 break;
164 case USB_SPEED_WIRELESS:
165 speed = "480";
166 break;
167 case USB_SPEED_SUPER:
168 speed = "5000";
169 break;
170 case USB_SPEED_SUPER_PLUS:
171 if (udev->ssp_rate == USB_SSP_GEN_2x2)
172 speed = "20000";
173 else
174 speed = "10000";
175 break;
176 default:
177 speed = "unknown";
178 }
179 return sysfs_emit(buf, "%s\n", speed);
180}
181static DEVICE_ATTR_RO(speed);
182
183static ssize_t rx_lanes_show(struct device *dev, struct device_attribute *attr,
184 char *buf)
185{
186 struct usb_device *udev;
187
188 udev = to_usb_device(dev);
189 return sysfs_emit(buf, "%d\n", udev->rx_lanes);
190}
191static DEVICE_ATTR_RO(rx_lanes);
192
193static ssize_t tx_lanes_show(struct device *dev, struct device_attribute *attr,
194 char *buf)
195{
196 struct usb_device *udev;
197
198 udev = to_usb_device(dev);
199 return sysfs_emit(buf, "%d\n", udev->tx_lanes);
200}
201static DEVICE_ATTR_RO(tx_lanes);
202
203static ssize_t busnum_show(struct device *dev, struct device_attribute *attr,
204 char *buf)
205{
206 struct usb_device *udev;
207
208 udev = to_usb_device(dev);
209 return sysfs_emit(buf, "%d\n", udev->bus->busnum);
210}
211static DEVICE_ATTR_RO(busnum);
212
213static ssize_t devnum_show(struct device *dev, struct device_attribute *attr,
214 char *buf)
215{
216 struct usb_device *udev;
217
218 udev = to_usb_device(dev);
219 return sysfs_emit(buf, "%d\n", udev->devnum);
220}
221static DEVICE_ATTR_RO(devnum);
222
223static ssize_t devpath_show(struct device *dev, struct device_attribute *attr,
224 char *buf)
225{
226 struct usb_device *udev;
227
228 udev = to_usb_device(dev);
229 return sysfs_emit(buf, "%s\n", udev->devpath);
230}
231static DEVICE_ATTR_RO(devpath);
232
233static ssize_t version_show(struct device *dev, struct device_attribute *attr,
234 char *buf)
235{
236 struct usb_device *udev;
237 u16 bcdUSB;
238
239 udev = to_usb_device(dev);
240 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
241 return sysfs_emit(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
242}
243static DEVICE_ATTR_RO(version);
244
245static ssize_t maxchild_show(struct device *dev, struct device_attribute *attr,
246 char *buf)
247{
248 struct usb_device *udev;
249
250 udev = to_usb_device(dev);
251 return sysfs_emit(buf, "%d\n", udev->maxchild);
252}
253static DEVICE_ATTR_RO(maxchild);
254
255static ssize_t quirks_show(struct device *dev, struct device_attribute *attr,
256 char *buf)
257{
258 struct usb_device *udev;
259
260 udev = to_usb_device(dev);
261 return sysfs_emit(buf, "0x%x\n", udev->quirks);
262}
263static DEVICE_ATTR_RO(quirks);
264
265static ssize_t avoid_reset_quirk_show(struct device *dev,
266 struct device_attribute *attr, char *buf)
267{
268 struct usb_device *udev;
269
270 udev = to_usb_device(dev);
271 return sysfs_emit(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET));
272}
273
274static ssize_t avoid_reset_quirk_store(struct device *dev,
275 struct device_attribute *attr,
276 const char *buf, size_t count)
277{
278 struct usb_device *udev = to_usb_device(dev);
279 int val, rc;
280
281 if (sscanf(buf, "%d", &val) != 1 || val < 0 || val > 1)
282 return -EINVAL;
283 rc = usb_lock_device_interruptible(udev);
284 if (rc < 0)
285 return -EINTR;
286 if (val)
287 udev->quirks |= USB_QUIRK_RESET;
288 else
289 udev->quirks &= ~USB_QUIRK_RESET;
290 usb_unlock_device(udev);
291 return count;
292}
293static DEVICE_ATTR_RW(avoid_reset_quirk);
294
295static ssize_t urbnum_show(struct device *dev, struct device_attribute *attr,
296 char *buf)
297{
298 struct usb_device *udev;
299
300 udev = to_usb_device(dev);
301 return sysfs_emit(buf, "%d\n", atomic_read(&udev->urbnum));
302}
303static DEVICE_ATTR_RO(urbnum);
304
305static ssize_t ltm_capable_show(struct device *dev,
306 struct device_attribute *attr, char *buf)
307{
308 if (usb_device_supports_ltm(to_usb_device(dev)))
309 return sysfs_emit(buf, "%s\n", "yes");
310 return sysfs_emit(buf, "%s\n", "no");
311}
312static DEVICE_ATTR_RO(ltm_capable);
313
314#ifdef CONFIG_PM
315
316static ssize_t persist_show(struct device *dev, struct device_attribute *attr,
317 char *buf)
318{
319 struct usb_device *udev = to_usb_device(dev);
320
321 return sysfs_emit(buf, "%d\n", udev->persist_enabled);
322}
323
324static ssize_t persist_store(struct device *dev, struct device_attribute *attr,
325 const char *buf, size_t count)
326{
327 struct usb_device *udev = to_usb_device(dev);
328 int value, rc;
329
330 /* Hubs are always enabled for USB_PERSIST */
331 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
332 return -EPERM;
333
334 if (sscanf(buf, "%d", &value) != 1)
335 return -EINVAL;
336
337 rc = usb_lock_device_interruptible(udev);
338 if (rc < 0)
339 return -EINTR;
340 udev->persist_enabled = !!value;
341 usb_unlock_device(udev);
342 return count;
343}
344static DEVICE_ATTR_RW(persist);
345
346static int add_persist_attributes(struct device *dev)
347{
348 int rc = 0;
349
350 if (is_usb_device(dev)) {
351 struct usb_device *udev = to_usb_device(dev);
352
353 /* Hubs are automatically enabled for USB_PERSIST,
354 * no point in creating the attribute file.
355 */
356 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
357 rc = sysfs_add_file_to_group(&dev->kobj,
358 &dev_attr_persist.attr,
359 power_group_name);
360 }
361 return rc;
362}
363
364static void remove_persist_attributes(struct device *dev)
365{
366 sysfs_remove_file_from_group(&dev->kobj,
367 &dev_attr_persist.attr,
368 power_group_name);
369}
370
371static ssize_t connected_duration_show(struct device *dev,
372 struct device_attribute *attr, char *buf)
373{
374 struct usb_device *udev = to_usb_device(dev);
375
376 return sysfs_emit(buf, "%u\n",
377 jiffies_to_msecs(jiffies - udev->connect_time));
378}
379static DEVICE_ATTR_RO(connected_duration);
380
381/*
382 * If the device is resumed, the last time the device was suspended has
383 * been pre-subtracted from active_duration. We add the current time to
384 * get the duration that the device was actually active.
385 *
386 * If the device is suspended, the active_duration is up-to-date.
387 */
388static ssize_t active_duration_show(struct device *dev,
389 struct device_attribute *attr, char *buf)
390{
391 struct usb_device *udev = to_usb_device(dev);
392 int duration;
393
394 if (udev->state != USB_STATE_SUSPENDED)
395 duration = jiffies_to_msecs(jiffies + udev->active_duration);
396 else
397 duration = jiffies_to_msecs(udev->active_duration);
398 return sysfs_emit(buf, "%u\n", duration);
399}
400static DEVICE_ATTR_RO(active_duration);
401
402static ssize_t autosuspend_show(struct device *dev,
403 struct device_attribute *attr, char *buf)
404{
405 return sysfs_emit(buf, "%d\n", dev->power.autosuspend_delay / 1000);
406}
407
408static ssize_t autosuspend_store(struct device *dev,
409 struct device_attribute *attr, const char *buf,
410 size_t count)
411{
412 int value;
413
414 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
415 value <= -INT_MAX/1000)
416 return -EINVAL;
417
418 pm_runtime_set_autosuspend_delay(dev, value * 1000);
419 return count;
420}
421static DEVICE_ATTR_RW(autosuspend);
422
423static const char on_string[] = "on";
424static const char auto_string[] = "auto";
425
426static void warn_level(void)
427{
428 static int level_warned;
429
430 if (!level_warned) {
431 level_warned = 1;
432 printk(KERN_WARNING "WARNING! power/level is deprecated; "
433 "use power/control instead\n");
434 }
435}
436
437static ssize_t level_show(struct device *dev, struct device_attribute *attr,
438 char *buf)
439{
440 struct usb_device *udev = to_usb_device(dev);
441 const char *p = auto_string;
442
443 warn_level();
444 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
445 p = on_string;
446 return sysfs_emit(buf, "%s\n", p);
447}
448
449static ssize_t level_store(struct device *dev, struct device_attribute *attr,
450 const char *buf, size_t count)
451{
452 struct usb_device *udev = to_usb_device(dev);
453 int len = count;
454 char *cp;
455 int rc = count;
456 int rv;
457
458 warn_level();
459 cp = memchr(buf, '\n', count);
460 if (cp)
461 len = cp - buf;
462
463 rv = usb_lock_device_interruptible(udev);
464 if (rv < 0)
465 return -EINTR;
466
467 if (len == sizeof on_string - 1 &&
468 strncmp(buf, on_string, len) == 0)
469 usb_disable_autosuspend(udev);
470
471 else if (len == sizeof auto_string - 1 &&
472 strncmp(buf, auto_string, len) == 0)
473 usb_enable_autosuspend(udev);
474
475 else
476 rc = -EINVAL;
477
478 usb_unlock_device(udev);
479 return rc;
480}
481static DEVICE_ATTR_RW(level);
482
483static ssize_t usb2_hardware_lpm_show(struct device *dev,
484 struct device_attribute *attr, char *buf)
485{
486 struct usb_device *udev = to_usb_device(dev);
487 const char *p;
488
489 if (udev->usb2_hw_lpm_allowed == 1)
490 p = "enabled";
491 else
492 p = "disabled";
493
494 return sysfs_emit(buf, "%s\n", p);
495}
496
497static ssize_t usb2_hardware_lpm_store(struct device *dev,
498 struct device_attribute *attr,
499 const char *buf, size_t count)
500{
501 struct usb_device *udev = to_usb_device(dev);
502 bool value;
503 int ret;
504
505 ret = usb_lock_device_interruptible(udev);
506 if (ret < 0)
507 return -EINTR;
508
509 ret = kstrtobool(buf, &value);
510
511 if (!ret) {
512 udev->usb2_hw_lpm_allowed = value;
513 if (value)
514 ret = usb_enable_usb2_hardware_lpm(udev);
515 else
516 ret = usb_disable_usb2_hardware_lpm(udev);
517 }
518
519 usb_unlock_device(udev);
520
521 if (!ret)
522 return count;
523
524 return ret;
525}
526static DEVICE_ATTR_RW(usb2_hardware_lpm);
527
528static ssize_t usb2_lpm_l1_timeout_show(struct device *dev,
529 struct device_attribute *attr,
530 char *buf)
531{
532 struct usb_device *udev = to_usb_device(dev);
533 return sysfs_emit(buf, "%d\n", udev->l1_params.timeout);
534}
535
536static ssize_t usb2_lpm_l1_timeout_store(struct device *dev,
537 struct device_attribute *attr,
538 const char *buf, size_t count)
539{
540 struct usb_device *udev = to_usb_device(dev);
541 u16 timeout;
542
543 if (kstrtou16(buf, 0, &timeout))
544 return -EINVAL;
545
546 udev->l1_params.timeout = timeout;
547
548 return count;
549}
550static DEVICE_ATTR_RW(usb2_lpm_l1_timeout);
551
552static ssize_t usb2_lpm_besl_show(struct device *dev,
553 struct device_attribute *attr, char *buf)
554{
555 struct usb_device *udev = to_usb_device(dev);
556 return sysfs_emit(buf, "%d\n", udev->l1_params.besl);
557}
558
559static ssize_t usb2_lpm_besl_store(struct device *dev,
560 struct device_attribute *attr,
561 const char *buf, size_t count)
562{
563 struct usb_device *udev = to_usb_device(dev);
564 u8 besl;
565
566 if (kstrtou8(buf, 0, &besl) || besl > 15)
567 return -EINVAL;
568
569 udev->l1_params.besl = besl;
570
571 return count;
572}
573static DEVICE_ATTR_RW(usb2_lpm_besl);
574
575static ssize_t usb3_hardware_lpm_u1_show(struct device *dev,
576 struct device_attribute *attr, char *buf)
577{
578 struct usb_device *udev = to_usb_device(dev);
579 const char *p;
580 int rc;
581
582 rc = usb_lock_device_interruptible(udev);
583 if (rc < 0)
584 return -EINTR;
585
586 if (udev->usb3_lpm_u1_enabled)
587 p = "enabled";
588 else
589 p = "disabled";
590
591 usb_unlock_device(udev);
592
593 return sysfs_emit(buf, "%s\n", p);
594}
595static DEVICE_ATTR_RO(usb3_hardware_lpm_u1);
596
597static ssize_t usb3_hardware_lpm_u2_show(struct device *dev,
598 struct device_attribute *attr, char *buf)
599{
600 struct usb_device *udev = to_usb_device(dev);
601 const char *p;
602 int rc;
603
604 rc = usb_lock_device_interruptible(udev);
605 if (rc < 0)
606 return -EINTR;
607
608 if (udev->usb3_lpm_u2_enabled)
609 p = "enabled";
610 else
611 p = "disabled";
612
613 usb_unlock_device(udev);
614
615 return sysfs_emit(buf, "%s\n", p);
616}
617static DEVICE_ATTR_RO(usb3_hardware_lpm_u2);
618
619static struct attribute *usb2_hardware_lpm_attr[] = {
620 &dev_attr_usb2_hardware_lpm.attr,
621 &dev_attr_usb2_lpm_l1_timeout.attr,
622 &dev_attr_usb2_lpm_besl.attr,
623 NULL,
624};
625static const struct attribute_group usb2_hardware_lpm_attr_group = {
626 .name = power_group_name,
627 .attrs = usb2_hardware_lpm_attr,
628};
629
630static struct attribute *usb3_hardware_lpm_attr[] = {
631 &dev_attr_usb3_hardware_lpm_u1.attr,
632 &dev_attr_usb3_hardware_lpm_u2.attr,
633 NULL,
634};
635static const struct attribute_group usb3_hardware_lpm_attr_group = {
636 .name = power_group_name,
637 .attrs = usb3_hardware_lpm_attr,
638};
639
640static struct attribute *power_attrs[] = {
641 &dev_attr_autosuspend.attr,
642 &dev_attr_level.attr,
643 &dev_attr_connected_duration.attr,
644 &dev_attr_active_duration.attr,
645 NULL,
646};
647static const struct attribute_group power_attr_group = {
648 .name = power_group_name,
649 .attrs = power_attrs,
650};
651
652static int add_power_attributes(struct device *dev)
653{
654 int rc = 0;
655
656 if (is_usb_device(dev)) {
657 struct usb_device *udev = to_usb_device(dev);
658 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
659 if (udev->usb2_hw_lpm_capable == 1)
660 rc = sysfs_merge_group(&dev->kobj,
661 &usb2_hardware_lpm_attr_group);
662 if ((udev->speed == USB_SPEED_SUPER ||
663 udev->speed == USB_SPEED_SUPER_PLUS) &&
664 udev->lpm_capable == 1)
665 rc = sysfs_merge_group(&dev->kobj,
666 &usb3_hardware_lpm_attr_group);
667 }
668
669 return rc;
670}
671
672static void remove_power_attributes(struct device *dev)
673{
674 sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
675 sysfs_unmerge_group(&dev->kobj, &power_attr_group);
676}
677
678#else
679
680#define add_persist_attributes(dev) 0
681#define remove_persist_attributes(dev) do {} while (0)
682
683#define add_power_attributes(dev) 0
684#define remove_power_attributes(dev) do {} while (0)
685
686#endif /* CONFIG_PM */
687
688
689/* Descriptor fields */
690#define usb_descriptor_attr_le16(field, format_string) \
691static ssize_t \
692field##_show(struct device *dev, struct device_attribute *attr, \
693 char *buf) \
694{ \
695 struct usb_device *udev; \
696 \
697 udev = to_usb_device(dev); \
698 return sysfs_emit(buf, format_string, \
699 le16_to_cpu(udev->descriptor.field)); \
700} \
701static DEVICE_ATTR_RO(field)
702
703usb_descriptor_attr_le16(idVendor, "%04x\n");
704usb_descriptor_attr_le16(idProduct, "%04x\n");
705usb_descriptor_attr_le16(bcdDevice, "%04x\n");
706
707#define usb_descriptor_attr(field, format_string) \
708static ssize_t \
709field##_show(struct device *dev, struct device_attribute *attr, \
710 char *buf) \
711{ \
712 struct usb_device *udev; \
713 \
714 udev = to_usb_device(dev); \
715 return sysfs_emit(buf, format_string, udev->descriptor.field); \
716} \
717static DEVICE_ATTR_RO(field)
718
719usb_descriptor_attr(bDeviceClass, "%02x\n");
720usb_descriptor_attr(bDeviceSubClass, "%02x\n");
721usb_descriptor_attr(bDeviceProtocol, "%02x\n");
722usb_descriptor_attr(bNumConfigurations, "%d\n");
723usb_descriptor_attr(bMaxPacketSize0, "%d\n");
724
725
726/* show if the device is authorized (1) or not (0) */
727static ssize_t authorized_show(struct device *dev,
728 struct device_attribute *attr, char *buf)
729{
730 struct usb_device *usb_dev = to_usb_device(dev);
731 return sysfs_emit(buf, "%u\n", usb_dev->authorized);
732}
733
734/*
735 * Authorize a device to be used in the system
736 *
737 * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
738 */
739static ssize_t authorized_store(struct device *dev,
740 struct device_attribute *attr, const char *buf,
741 size_t size)
742{
743 ssize_t result;
744 struct usb_device *usb_dev = to_usb_device(dev);
745 unsigned val;
746 result = sscanf(buf, "%u\n", &val);
747 if (result != 1)
748 result = -EINVAL;
749 else if (val == 0)
750 result = usb_deauthorize_device(usb_dev);
751 else
752 result = usb_authorize_device(usb_dev);
753 return result < 0 ? result : size;
754}
755static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, S_IRUGO | S_IWUSR,
756 authorized_show, authorized_store);
757
758/* "Safely remove a device" */
759static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
760 const char *buf, size_t count)
761{
762 struct usb_device *udev = to_usb_device(dev);
763 int rc = 0;
764
765 usb_lock_device(udev);
766 if (udev->state != USB_STATE_NOTATTACHED) {
767
768 /* To avoid races, first unconfigure and then remove */
769 usb_set_configuration(udev, -1);
770 rc = usb_remove_device(udev);
771 }
772 if (rc == 0)
773 rc = count;
774 usb_unlock_device(udev);
775 return rc;
776}
777static DEVICE_ATTR_IGNORE_LOCKDEP(remove, S_IWUSR, NULL, remove_store);
778
779
780static struct attribute *dev_attrs[] = {
781 /* current configuration's attributes */
782 &dev_attr_configuration.attr,
783 &dev_attr_bNumInterfaces.attr,
784 &dev_attr_bConfigurationValue.attr,
785 &dev_attr_bmAttributes.attr,
786 &dev_attr_bMaxPower.attr,
787 /* device attributes */
788 &dev_attr_urbnum.attr,
789 &dev_attr_idVendor.attr,
790 &dev_attr_idProduct.attr,
791 &dev_attr_bcdDevice.attr,
792 &dev_attr_bDeviceClass.attr,
793 &dev_attr_bDeviceSubClass.attr,
794 &dev_attr_bDeviceProtocol.attr,
795 &dev_attr_bNumConfigurations.attr,
796 &dev_attr_bMaxPacketSize0.attr,
797 &dev_attr_speed.attr,
798 &dev_attr_rx_lanes.attr,
799 &dev_attr_tx_lanes.attr,
800 &dev_attr_busnum.attr,
801 &dev_attr_devnum.attr,
802 &dev_attr_devpath.attr,
803 &dev_attr_version.attr,
804 &dev_attr_maxchild.attr,
805 &dev_attr_quirks.attr,
806 &dev_attr_avoid_reset_quirk.attr,
807 &dev_attr_authorized.attr,
808 &dev_attr_remove.attr,
809 &dev_attr_ltm_capable.attr,
810#ifdef CONFIG_OF
811 &dev_attr_devspec.attr,
812#endif
813 NULL,
814};
815static const struct attribute_group dev_attr_grp = {
816 .attrs = dev_attrs,
817};
818
819/* When modifying this list, be sure to modify dev_string_attrs_are_visible()
820 * accordingly.
821 */
822static struct attribute *dev_string_attrs[] = {
823 &dev_attr_manufacturer.attr,
824 &dev_attr_product.attr,
825 &dev_attr_serial.attr,
826 NULL
827};
828
829static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
830 struct attribute *a, int n)
831{
832 struct device *dev = kobj_to_dev(kobj);
833 struct usb_device *udev = to_usb_device(dev);
834
835 if (a == &dev_attr_manufacturer.attr) {
836 if (udev->manufacturer == NULL)
837 return 0;
838 } else if (a == &dev_attr_product.attr) {
839 if (udev->product == NULL)
840 return 0;
841 } else if (a == &dev_attr_serial.attr) {
842 if (udev->serial == NULL)
843 return 0;
844 }
845 return a->mode;
846}
847
848static const struct attribute_group dev_string_attr_grp = {
849 .attrs = dev_string_attrs,
850 .is_visible = dev_string_attrs_are_visible,
851};
852
853const struct attribute_group *usb_device_groups[] = {
854 &dev_attr_grp,
855 &dev_string_attr_grp,
856 NULL
857};
858
859/* Binary descriptors */
860
861static ssize_t
862read_descriptors(struct file *filp, struct kobject *kobj,
863 struct bin_attribute *attr,
864 char *buf, loff_t off, size_t count)
865{
866 struct device *dev = kobj_to_dev(kobj);
867 struct usb_device *udev = to_usb_device(dev);
868 size_t nleft = count;
869 size_t srclen, n;
870 int cfgno;
871 void *src;
872 int retval;
873
874 retval = usb_lock_device_interruptible(udev);
875 if (retval < 0)
876 return -EINTR;
877 /* The binary attribute begins with the device descriptor.
878 * Following that are the raw descriptor entries for all the
879 * configurations (config plus subsidiary descriptors).
880 */
881 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
882 nleft > 0; ++cfgno) {
883 if (cfgno < 0) {
884 src = &udev->descriptor;
885 srclen = sizeof(struct usb_device_descriptor);
886 } else {
887 src = udev->rawdescriptors[cfgno];
888 srclen = __le16_to_cpu(udev->config[cfgno].desc.
889 wTotalLength);
890 }
891 if (off < srclen) {
892 n = min(nleft, srclen - (size_t) off);
893 memcpy(buf, src + off, n);
894 nleft -= n;
895 buf += n;
896 off = 0;
897 } else {
898 off -= srclen;
899 }
900 }
901 usb_unlock_device(udev);
902 return count - nleft;
903}
904
905static struct bin_attribute dev_bin_attr_descriptors = {
906 .attr = {.name = "descriptors", .mode = 0444},
907 .read = read_descriptors,
908 .size = 18 + 65535, /* dev descr + max-size raw descriptor */
909};
910
911/*
912 * Show & store the current value of authorized_default
913 */
914static ssize_t authorized_default_show(struct device *dev,
915 struct device_attribute *attr, char *buf)
916{
917 struct usb_device *rh_usb_dev = to_usb_device(dev);
918 struct usb_bus *usb_bus = rh_usb_dev->bus;
919 struct usb_hcd *hcd;
920
921 hcd = bus_to_hcd(usb_bus);
922 return sysfs_emit(buf, "%u\n", hcd->dev_policy);
923}
924
925static ssize_t authorized_default_store(struct device *dev,
926 struct device_attribute *attr,
927 const char *buf, size_t size)
928{
929 ssize_t result;
930 unsigned int val;
931 struct usb_device *rh_usb_dev = to_usb_device(dev);
932 struct usb_bus *usb_bus = rh_usb_dev->bus;
933 struct usb_hcd *hcd;
934
935 hcd = bus_to_hcd(usb_bus);
936 result = sscanf(buf, "%u\n", &val);
937 if (result == 1) {
938 hcd->dev_policy = val <= USB_DEVICE_AUTHORIZE_INTERNAL ?
939 val : USB_DEVICE_AUTHORIZE_ALL;
940 result = size;
941 } else {
942 result = -EINVAL;
943 }
944 return result;
945}
946static DEVICE_ATTR_RW(authorized_default);
947
948/*
949 * interface_authorized_default_show - show default authorization status
950 * for USB interfaces
951 *
952 * note: interface_authorized_default is the default value
953 * for initializing the authorized attribute of interfaces
954 */
955static ssize_t interface_authorized_default_show(struct device *dev,
956 struct device_attribute *attr, char *buf)
957{
958 struct usb_device *usb_dev = to_usb_device(dev);
959 struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
960
961 return sysfs_emit(buf, "%u\n", !!HCD_INTF_AUTHORIZED(hcd));
962}
963
964/*
965 * interface_authorized_default_store - store default authorization status
966 * for USB interfaces
967 *
968 * note: interface_authorized_default is the default value
969 * for initializing the authorized attribute of interfaces
970 */
971static ssize_t interface_authorized_default_store(struct device *dev,
972 struct device_attribute *attr, const char *buf, size_t count)
973{
974 struct usb_device *usb_dev = to_usb_device(dev);
975 struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
976 int rc = count;
977 bool val;
978
979 if (kstrtobool(buf, &val) != 0)
980 return -EINVAL;
981
982 if (val)
983 set_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
984 else
985 clear_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
986
987 return rc;
988}
989static DEVICE_ATTR_RW(interface_authorized_default);
990
991/* Group all the USB bus attributes */
992static struct attribute *usb_bus_attrs[] = {
993 &dev_attr_authorized_default.attr,
994 &dev_attr_interface_authorized_default.attr,
995 NULL,
996};
997
998static const struct attribute_group usb_bus_attr_group = {
999 .name = NULL, /* we want them in the same directory */
1000 .attrs = usb_bus_attrs,
1001};
1002
1003
1004static int add_default_authorized_attributes(struct device *dev)
1005{
1006 int rc = 0;
1007
1008 if (is_usb_device(dev))
1009 rc = sysfs_create_group(&dev->kobj, &usb_bus_attr_group);
1010
1011 return rc;
1012}
1013
1014static void remove_default_authorized_attributes(struct device *dev)
1015{
1016 if (is_usb_device(dev)) {
1017 sysfs_remove_group(&dev->kobj, &usb_bus_attr_group);
1018 }
1019}
1020
1021int usb_create_sysfs_dev_files(struct usb_device *udev)
1022{
1023 struct device *dev = &udev->dev;
1024 int retval;
1025
1026 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
1027 if (retval)
1028 goto error;
1029
1030 retval = add_persist_attributes(dev);
1031 if (retval)
1032 goto error;
1033
1034 retval = add_power_attributes(dev);
1035 if (retval)
1036 goto error;
1037
1038 if (is_root_hub(udev)) {
1039 retval = add_default_authorized_attributes(dev);
1040 if (retval)
1041 goto error;
1042 }
1043 return retval;
1044
1045error:
1046 usb_remove_sysfs_dev_files(udev);
1047 return retval;
1048}
1049
1050void usb_remove_sysfs_dev_files(struct usb_device *udev)
1051{
1052 struct device *dev = &udev->dev;
1053
1054 if (is_root_hub(udev))
1055 remove_default_authorized_attributes(dev);
1056
1057 remove_power_attributes(dev);
1058 remove_persist_attributes(dev);
1059 device_remove_bin_file(dev, &dev_bin_attr_descriptors);
1060}
1061
1062/* Interface Association Descriptor fields */
1063#define usb_intf_assoc_attr(field, format_string) \
1064static ssize_t \
1065iad_##field##_show(struct device *dev, struct device_attribute *attr, \
1066 char *buf) \
1067{ \
1068 struct usb_interface *intf = to_usb_interface(dev); \
1069 \
1070 return sysfs_emit(buf, format_string, \
1071 intf->intf_assoc->field); \
1072} \
1073static DEVICE_ATTR_RO(iad_##field)
1074
1075usb_intf_assoc_attr(bFirstInterface, "%02x\n");
1076usb_intf_assoc_attr(bInterfaceCount, "%02d\n");
1077usb_intf_assoc_attr(bFunctionClass, "%02x\n");
1078usb_intf_assoc_attr(bFunctionSubClass, "%02x\n");
1079usb_intf_assoc_attr(bFunctionProtocol, "%02x\n");
1080
1081/* Interface fields */
1082#define usb_intf_attr(field, format_string) \
1083static ssize_t \
1084field##_show(struct device *dev, struct device_attribute *attr, \
1085 char *buf) \
1086{ \
1087 struct usb_interface *intf = to_usb_interface(dev); \
1088 \
1089 return sysfs_emit(buf, format_string, \
1090 intf->cur_altsetting->desc.field); \
1091} \
1092static DEVICE_ATTR_RO(field)
1093
1094usb_intf_attr(bInterfaceNumber, "%02x\n");
1095usb_intf_attr(bAlternateSetting, "%2d\n");
1096usb_intf_attr(bNumEndpoints, "%02x\n");
1097usb_intf_attr(bInterfaceClass, "%02x\n");
1098usb_intf_attr(bInterfaceSubClass, "%02x\n");
1099usb_intf_attr(bInterfaceProtocol, "%02x\n");
1100
1101static ssize_t interface_show(struct device *dev, struct device_attribute *attr,
1102 char *buf)
1103{
1104 struct usb_interface *intf;
1105 char *string;
1106
1107 intf = to_usb_interface(dev);
1108 string = READ_ONCE(intf->cur_altsetting->string);
1109 if (!string)
1110 return 0;
1111 return sysfs_emit(buf, "%s\n", string);
1112}
1113static DEVICE_ATTR_RO(interface);
1114
1115static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
1116 char *buf)
1117{
1118 struct usb_interface *intf;
1119 struct usb_device *udev;
1120 struct usb_host_interface *alt;
1121
1122 intf = to_usb_interface(dev);
1123 udev = interface_to_usbdev(intf);
1124 alt = READ_ONCE(intf->cur_altsetting);
1125
1126 return sysfs_emit(buf,
1127 "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
1128 "ic%02Xisc%02Xip%02Xin%02X\n",
1129 le16_to_cpu(udev->descriptor.idVendor),
1130 le16_to_cpu(udev->descriptor.idProduct),
1131 le16_to_cpu(udev->descriptor.bcdDevice),
1132 udev->descriptor.bDeviceClass,
1133 udev->descriptor.bDeviceSubClass,
1134 udev->descriptor.bDeviceProtocol,
1135 alt->desc.bInterfaceClass,
1136 alt->desc.bInterfaceSubClass,
1137 alt->desc.bInterfaceProtocol,
1138 alt->desc.bInterfaceNumber);
1139}
1140static DEVICE_ATTR_RO(modalias);
1141
1142static ssize_t supports_autosuspend_show(struct device *dev,
1143 struct device_attribute *attr,
1144 char *buf)
1145{
1146 int s;
1147
1148 s = device_lock_interruptible(dev);
1149 if (s < 0)
1150 return -EINTR;
1151 /* Devices will be autosuspended even when an interface isn't claimed */
1152 s = (!dev->driver || to_usb_driver(dev->driver)->supports_autosuspend);
1153 device_unlock(dev);
1154
1155 return sysfs_emit(buf, "%u\n", s);
1156}
1157static DEVICE_ATTR_RO(supports_autosuspend);
1158
1159/*
1160 * interface_authorized_show - show authorization status of an USB interface
1161 * 1 is authorized, 0 is deauthorized
1162 */
1163static ssize_t interface_authorized_show(struct device *dev,
1164 struct device_attribute *attr, char *buf)
1165{
1166 struct usb_interface *intf = to_usb_interface(dev);
1167
1168 return sysfs_emit(buf, "%u\n", intf->authorized);
1169}
1170
1171/*
1172 * interface_authorized_store - authorize or deauthorize an USB interface
1173 */
1174static ssize_t interface_authorized_store(struct device *dev,
1175 struct device_attribute *attr, const char *buf, size_t count)
1176{
1177 struct usb_interface *intf = to_usb_interface(dev);
1178 bool val;
1179
1180 if (kstrtobool(buf, &val) != 0)
1181 return -EINVAL;
1182
1183 if (val)
1184 usb_authorize_interface(intf);
1185 else
1186 usb_deauthorize_interface(intf);
1187
1188 return count;
1189}
1190static struct device_attribute dev_attr_interface_authorized =
1191 __ATTR(authorized, S_IRUGO | S_IWUSR,
1192 interface_authorized_show, interface_authorized_store);
1193
1194static struct attribute *intf_attrs[] = {
1195 &dev_attr_bInterfaceNumber.attr,
1196 &dev_attr_bAlternateSetting.attr,
1197 &dev_attr_bNumEndpoints.attr,
1198 &dev_attr_bInterfaceClass.attr,
1199 &dev_attr_bInterfaceSubClass.attr,
1200 &dev_attr_bInterfaceProtocol.attr,
1201 &dev_attr_modalias.attr,
1202 &dev_attr_supports_autosuspend.attr,
1203 &dev_attr_interface_authorized.attr,
1204 NULL,
1205};
1206static const struct attribute_group intf_attr_grp = {
1207 .attrs = intf_attrs,
1208};
1209
1210static struct attribute *intf_assoc_attrs[] = {
1211 &dev_attr_iad_bFirstInterface.attr,
1212 &dev_attr_iad_bInterfaceCount.attr,
1213 &dev_attr_iad_bFunctionClass.attr,
1214 &dev_attr_iad_bFunctionSubClass.attr,
1215 &dev_attr_iad_bFunctionProtocol.attr,
1216 NULL,
1217};
1218
1219static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
1220 struct attribute *a, int n)
1221{
1222 struct device *dev = kobj_to_dev(kobj);
1223 struct usb_interface *intf = to_usb_interface(dev);
1224
1225 if (intf->intf_assoc == NULL)
1226 return 0;
1227 return a->mode;
1228}
1229
1230static const struct attribute_group intf_assoc_attr_grp = {
1231 .attrs = intf_assoc_attrs,
1232 .is_visible = intf_assoc_attrs_are_visible,
1233};
1234
1235const struct attribute_group *usb_interface_groups[] = {
1236 &intf_attr_grp,
1237 &intf_assoc_attr_grp,
1238 NULL
1239};
1240
1241void usb_create_sysfs_intf_files(struct usb_interface *intf)
1242{
1243 struct usb_device *udev = interface_to_usbdev(intf);
1244 struct usb_host_interface *alt = intf->cur_altsetting;
1245
1246 if (intf->sysfs_files_created || intf->unregistering)
1247 return;
1248
1249 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
1250 alt->string = usb_cache_string(udev, alt->desc.iInterface);
1251 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface)) {
1252 /* This is not a serious error */
1253 dev_dbg(&intf->dev, "interface string descriptor file not created\n");
1254 }
1255 intf->sysfs_files_created = 1;
1256}
1257
1258void usb_remove_sysfs_intf_files(struct usb_interface *intf)
1259{
1260 if (!intf->sysfs_files_created)
1261 return;
1262
1263 device_remove_file(&intf->dev, &dev_attr_interface);
1264 intf->sysfs_files_created = 0;
1265}