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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
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
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, "%pOF\n", of_node);
117}
118static DEVICE_ATTR_RO(devspec);
119#endif
120
121
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
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
352
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
381
382
383
384
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->speed == USB_SPEED_SUPER_PLUS) &&
659 udev->lpm_capable == 1)
660 rc = sysfs_merge_group(&dev->kobj,
661 &usb3_hardware_lpm_attr_group);
662 }
663
664 return rc;
665}
666
667static void remove_power_attributes(struct device *dev)
668{
669 sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
670 sysfs_unmerge_group(&dev->kobj, &power_attr_group);
671}
672
673#else
674
675#define add_persist_attributes(dev) 0
676#define remove_persist_attributes(dev) do {} while (0)
677
678#define add_power_attributes(dev) 0
679#define remove_power_attributes(dev) do {} while (0)
680
681#endif
682
683
684
685#define usb_descriptor_attr_le16(field, format_string) \
686static ssize_t \
687field##_show(struct device *dev, struct device_attribute *attr, \
688 char *buf) \
689{ \
690 struct usb_device *udev; \
691 \
692 udev = to_usb_device(dev); \
693 return sprintf(buf, format_string, \
694 le16_to_cpu(udev->descriptor.field)); \
695} \
696static DEVICE_ATTR_RO(field)
697
698usb_descriptor_attr_le16(idVendor, "%04x\n");
699usb_descriptor_attr_le16(idProduct, "%04x\n");
700usb_descriptor_attr_le16(bcdDevice, "%04x\n");
701
702#define usb_descriptor_attr(field, format_string) \
703static ssize_t \
704field##_show(struct device *dev, struct device_attribute *attr, \
705 char *buf) \
706{ \
707 struct usb_device *udev; \
708 \
709 udev = to_usb_device(dev); \
710 return sprintf(buf, format_string, udev->descriptor.field); \
711} \
712static DEVICE_ATTR_RO(field)
713
714usb_descriptor_attr(bDeviceClass, "%02x\n");
715usb_descriptor_attr(bDeviceSubClass, "%02x\n");
716usb_descriptor_attr(bDeviceProtocol, "%02x\n");
717usb_descriptor_attr(bNumConfigurations, "%d\n");
718usb_descriptor_attr(bMaxPacketSize0, "%d\n");
719
720
721
722static ssize_t authorized_show(struct device *dev,
723 struct device_attribute *attr, char *buf)
724{
725 struct usb_device *usb_dev = to_usb_device(dev);
726 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
727}
728
729
730
731
732
733
734static ssize_t authorized_store(struct device *dev,
735 struct device_attribute *attr, const char *buf,
736 size_t size)
737{
738 ssize_t result;
739 struct usb_device *usb_dev = to_usb_device(dev);
740 unsigned val;
741 result = sscanf(buf, "%u\n", &val);
742 if (result != 1)
743 result = -EINVAL;
744 else if (val == 0)
745 result = usb_deauthorize_device(usb_dev);
746 else
747 result = usb_authorize_device(usb_dev);
748 return result < 0 ? result : size;
749}
750static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, S_IRUGO | S_IWUSR,
751 authorized_show, authorized_store);
752
753
754static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
755 const char *buf, size_t count)
756{
757 struct usb_device *udev = to_usb_device(dev);
758 int rc = 0;
759
760 usb_lock_device(udev);
761 if (udev->state != USB_STATE_NOTATTACHED) {
762
763
764 usb_set_configuration(udev, -1);
765 rc = usb_remove_device(udev);
766 }
767 if (rc == 0)
768 rc = count;
769 usb_unlock_device(udev);
770 return rc;
771}
772static DEVICE_ATTR_IGNORE_LOCKDEP(remove, S_IWUSR, NULL, remove_store);
773
774
775static struct attribute *dev_attrs[] = {
776
777 &dev_attr_configuration.attr,
778 &dev_attr_bNumInterfaces.attr,
779 &dev_attr_bConfigurationValue.attr,
780 &dev_attr_bmAttributes.attr,
781 &dev_attr_bMaxPower.attr,
782
783 &dev_attr_urbnum.attr,
784 &dev_attr_idVendor.attr,
785 &dev_attr_idProduct.attr,
786 &dev_attr_bcdDevice.attr,
787 &dev_attr_bDeviceClass.attr,
788 &dev_attr_bDeviceSubClass.attr,
789 &dev_attr_bDeviceProtocol.attr,
790 &dev_attr_bNumConfigurations.attr,
791 &dev_attr_bMaxPacketSize0.attr,
792 &dev_attr_speed.attr,
793 &dev_attr_busnum.attr,
794 &dev_attr_devnum.attr,
795 &dev_attr_devpath.attr,
796 &dev_attr_version.attr,
797 &dev_attr_maxchild.attr,
798 &dev_attr_quirks.attr,
799 &dev_attr_avoid_reset_quirk.attr,
800 &dev_attr_authorized.attr,
801 &dev_attr_remove.attr,
802 &dev_attr_removable.attr,
803 &dev_attr_ltm_capable.attr,
804#ifdef CONFIG_OF
805 &dev_attr_devspec.attr,
806#endif
807 NULL,
808};
809static struct attribute_group dev_attr_grp = {
810 .attrs = dev_attrs,
811};
812
813
814
815
816static struct attribute *dev_string_attrs[] = {
817 &dev_attr_manufacturer.attr,
818 &dev_attr_product.attr,
819 &dev_attr_serial.attr,
820 NULL
821};
822
823static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
824 struct attribute *a, int n)
825{
826 struct device *dev = container_of(kobj, struct device, kobj);
827 struct usb_device *udev = to_usb_device(dev);
828
829 if (a == &dev_attr_manufacturer.attr) {
830 if (udev->manufacturer == NULL)
831 return 0;
832 } else if (a == &dev_attr_product.attr) {
833 if (udev->product == NULL)
834 return 0;
835 } else if (a == &dev_attr_serial.attr) {
836 if (udev->serial == NULL)
837 return 0;
838 }
839 return a->mode;
840}
841
842static struct attribute_group dev_string_attr_grp = {
843 .attrs = dev_string_attrs,
844 .is_visible = dev_string_attrs_are_visible,
845};
846
847const struct attribute_group *usb_device_groups[] = {
848 &dev_attr_grp,
849 &dev_string_attr_grp,
850 NULL
851};
852
853
854
855static ssize_t
856read_descriptors(struct file *filp, struct kobject *kobj,
857 struct bin_attribute *attr,
858 char *buf, loff_t off, size_t count)
859{
860 struct device *dev = container_of(kobj, struct device, kobj);
861 struct usb_device *udev = to_usb_device(dev);
862 size_t nleft = count;
863 size_t srclen, n;
864 int cfgno;
865 void *src;
866
867
868
869
870
871 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
872 nleft > 0; ++cfgno) {
873 if (cfgno < 0) {
874 src = &udev->descriptor;
875 srclen = sizeof(struct usb_device_descriptor);
876 } else {
877 src = udev->rawdescriptors[cfgno];
878 srclen = __le16_to_cpu(udev->config[cfgno].desc.
879 wTotalLength);
880 }
881 if (off < srclen) {
882 n = min(nleft, srclen - (size_t) off);
883 memcpy(buf, src + off, n);
884 nleft -= n;
885 buf += n;
886 off = 0;
887 } else {
888 off -= srclen;
889 }
890 }
891 return count - nleft;
892}
893
894static struct bin_attribute dev_bin_attr_descriptors = {
895 .attr = {.name = "descriptors", .mode = 0444},
896 .read = read_descriptors,
897 .size = 18 + 65535,
898};
899
900int usb_create_sysfs_dev_files(struct usb_device *udev)
901{
902 struct device *dev = &udev->dev;
903 int retval;
904
905 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
906 if (retval)
907 goto error;
908
909 retval = add_persist_attributes(dev);
910 if (retval)
911 goto error;
912
913 retval = add_power_attributes(dev);
914 if (retval)
915 goto error;
916 return retval;
917error:
918 usb_remove_sysfs_dev_files(udev);
919 return retval;
920}
921
922void usb_remove_sysfs_dev_files(struct usb_device *udev)
923{
924 struct device *dev = &udev->dev;
925
926 remove_power_attributes(dev);
927 remove_persist_attributes(dev);
928 device_remove_bin_file(dev, &dev_bin_attr_descriptors);
929}
930
931
932#define usb_intf_assoc_attr(field, format_string) \
933static ssize_t \
934iad_##field##_show(struct device *dev, struct device_attribute *attr, \
935 char *buf) \
936{ \
937 struct usb_interface *intf = to_usb_interface(dev); \
938 \
939 return sprintf(buf, format_string, \
940 intf->intf_assoc->field); \
941} \
942static DEVICE_ATTR_RO(iad_##field)
943
944usb_intf_assoc_attr(bFirstInterface, "%02x\n");
945usb_intf_assoc_attr(bInterfaceCount, "%02d\n");
946usb_intf_assoc_attr(bFunctionClass, "%02x\n");
947usb_intf_assoc_attr(bFunctionSubClass, "%02x\n");
948usb_intf_assoc_attr(bFunctionProtocol, "%02x\n");
949
950
951#define usb_intf_attr(field, format_string) \
952static ssize_t \
953field##_show(struct device *dev, struct device_attribute *attr, \
954 char *buf) \
955{ \
956 struct usb_interface *intf = to_usb_interface(dev); \
957 \
958 return sprintf(buf, format_string, \
959 intf->cur_altsetting->desc.field); \
960} \
961static DEVICE_ATTR_RO(field)
962
963usb_intf_attr(bInterfaceNumber, "%02x\n");
964usb_intf_attr(bAlternateSetting, "%2d\n");
965usb_intf_attr(bNumEndpoints, "%02x\n");
966usb_intf_attr(bInterfaceClass, "%02x\n");
967usb_intf_attr(bInterfaceSubClass, "%02x\n");
968usb_intf_attr(bInterfaceProtocol, "%02x\n");
969
970static ssize_t interface_show(struct device *dev, struct device_attribute *attr,
971 char *buf)
972{
973 struct usb_interface *intf;
974 char *string;
975
976 intf = to_usb_interface(dev);
977 string = READ_ONCE(intf->cur_altsetting->string);
978 if (!string)
979 return 0;
980 return sprintf(buf, "%s\n", string);
981}
982static DEVICE_ATTR_RO(interface);
983
984static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
985 char *buf)
986{
987 struct usb_interface *intf;
988 struct usb_device *udev;
989 struct usb_host_interface *alt;
990
991 intf = to_usb_interface(dev);
992 udev = interface_to_usbdev(intf);
993 alt = READ_ONCE(intf->cur_altsetting);
994
995 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
996 "ic%02Xisc%02Xip%02Xin%02X\n",
997 le16_to_cpu(udev->descriptor.idVendor),
998 le16_to_cpu(udev->descriptor.idProduct),
999 le16_to_cpu(udev->descriptor.bcdDevice),
1000 udev->descriptor.bDeviceClass,
1001 udev->descriptor.bDeviceSubClass,
1002 udev->descriptor.bDeviceProtocol,
1003 alt->desc.bInterfaceClass,
1004 alt->desc.bInterfaceSubClass,
1005 alt->desc.bInterfaceProtocol,
1006 alt->desc.bInterfaceNumber);
1007}
1008static DEVICE_ATTR_RO(modalias);
1009
1010static ssize_t supports_autosuspend_show(struct device *dev,
1011 struct device_attribute *attr,
1012 char *buf)
1013{
1014 int s;
1015
1016 s = device_lock_interruptible(dev);
1017 if (s < 0)
1018 return -EINTR;
1019
1020 s = (!dev->driver || to_usb_driver(dev->driver)->supports_autosuspend);
1021 device_unlock(dev);
1022
1023 return sprintf(buf, "%u\n", s);
1024}
1025static DEVICE_ATTR_RO(supports_autosuspend);
1026
1027
1028
1029
1030
1031static ssize_t interface_authorized_show(struct device *dev,
1032 struct device_attribute *attr, char *buf)
1033{
1034 struct usb_interface *intf = to_usb_interface(dev);
1035
1036 return sprintf(buf, "%u\n", intf->authorized);
1037}
1038
1039
1040
1041
1042static ssize_t interface_authorized_store(struct device *dev,
1043 struct device_attribute *attr, const char *buf, size_t count)
1044{
1045 struct usb_interface *intf = to_usb_interface(dev);
1046 bool val;
1047
1048 if (strtobool(buf, &val) != 0)
1049 return -EINVAL;
1050
1051 if (val)
1052 usb_authorize_interface(intf);
1053 else
1054 usb_deauthorize_interface(intf);
1055
1056 return count;
1057}
1058static struct device_attribute dev_attr_interface_authorized =
1059 __ATTR(authorized, S_IRUGO | S_IWUSR,
1060 interface_authorized_show, interface_authorized_store);
1061
1062static struct attribute *intf_attrs[] = {
1063 &dev_attr_bInterfaceNumber.attr,
1064 &dev_attr_bAlternateSetting.attr,
1065 &dev_attr_bNumEndpoints.attr,
1066 &dev_attr_bInterfaceClass.attr,
1067 &dev_attr_bInterfaceSubClass.attr,
1068 &dev_attr_bInterfaceProtocol.attr,
1069 &dev_attr_modalias.attr,
1070 &dev_attr_supports_autosuspend.attr,
1071 &dev_attr_interface_authorized.attr,
1072 NULL,
1073};
1074static struct attribute_group intf_attr_grp = {
1075 .attrs = intf_attrs,
1076};
1077
1078static struct attribute *intf_assoc_attrs[] = {
1079 &dev_attr_iad_bFirstInterface.attr,
1080 &dev_attr_iad_bInterfaceCount.attr,
1081 &dev_attr_iad_bFunctionClass.attr,
1082 &dev_attr_iad_bFunctionSubClass.attr,
1083 &dev_attr_iad_bFunctionProtocol.attr,
1084 NULL,
1085};
1086
1087static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
1088 struct attribute *a, int n)
1089{
1090 struct device *dev = container_of(kobj, struct device, kobj);
1091 struct usb_interface *intf = to_usb_interface(dev);
1092
1093 if (intf->intf_assoc == NULL)
1094 return 0;
1095 return a->mode;
1096}
1097
1098static struct attribute_group intf_assoc_attr_grp = {
1099 .attrs = intf_assoc_attrs,
1100 .is_visible = intf_assoc_attrs_are_visible,
1101};
1102
1103const struct attribute_group *usb_interface_groups[] = {
1104 &intf_attr_grp,
1105 &intf_assoc_attr_grp,
1106 NULL
1107};
1108
1109void usb_create_sysfs_intf_files(struct usb_interface *intf)
1110{
1111 struct usb_device *udev = interface_to_usbdev(intf);
1112 struct usb_host_interface *alt = intf->cur_altsetting;
1113
1114 if (intf->sysfs_files_created || intf->unregistering)
1115 return;
1116
1117 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
1118 alt->string = usb_cache_string(udev, alt->desc.iInterface);
1119 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface))
1120 ;
1121 intf->sysfs_files_created = 1;
1122}
1123
1124void usb_remove_sysfs_intf_files(struct usb_interface *intf)
1125{
1126 if (!intf->sysfs_files_created)
1127 return;
1128
1129 device_remove_file(&intf->dev, &dev_attr_interface);
1130 intf->sysfs_files_created = 0;
1131}
1132
