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