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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
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
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
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
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
353
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
382
383
384
385
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
686
687
688
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
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
735
736
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
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
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
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
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
819
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
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
877
878
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,
908};
909
910
911
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
949
950
951
952
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
965
966
967
968
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
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,
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
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
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
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
1159
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
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
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}
1264
