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