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