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1/*
2 * drivers/usb/core/sysfs.c
3 *
4 * (C) Copyright 2002 David Brownell
5 * (C) Copyright 2002,2004 Greg Kroah-Hartman
6 * (C) Copyright 2002,2004 IBM Corp.
7 *
8 * All of the sysfs file attributes for usb devices and interfaces.
9 *
10 */
11
12
13#include <linux/kernel.h>
14#include <linux/string.h>
15#include <linux/usb.h>
16#include <linux/usb/quirks.h>
17#include "usb.h"
18
19/* Active configuration fields */
20#define usb_actconfig_show(field, format_string) \
21static ssize_t field##_show(struct device *dev, \
22 struct device_attribute *attr, char *buf) \
23{ \
24 struct usb_device *udev; \
25 struct usb_host_config *actconfig; \
26 ssize_t rc; \
27 \
28 udev = to_usb_device(dev); \
29 rc = usb_lock_device_interruptible(udev); \
30 if (rc < 0) \
31 return -EINTR; \
32 actconfig = udev->actconfig; \
33 if (actconfig) \
34 rc = sprintf(buf, format_string, \
35 actconfig->desc.field); \
36 usb_unlock_device(udev); \
37 return rc; \
38} \
39
40#define usb_actconfig_attr(field, format_string) \
41 usb_actconfig_show(field, format_string) \
42 static DEVICE_ATTR_RO(field)
43
44usb_actconfig_attr(bNumInterfaces, "%2d\n");
45usb_actconfig_attr(bmAttributes, "%2x\n");
46
47static ssize_t bMaxPower_show(struct device *dev,
48 struct device_attribute *attr, char *buf)
49{
50 struct usb_device *udev;
51 struct usb_host_config *actconfig;
52 ssize_t rc;
53
54 udev = to_usb_device(dev);
55 rc = usb_lock_device_interruptible(udev);
56 if (rc < 0)
57 return -EINTR;
58 actconfig = udev->actconfig;
59 if (actconfig)
60 rc = sprintf(buf, "%dmA\n", usb_get_max_power(udev, actconfig));
61 usb_unlock_device(udev);
62 return rc;
63}
64static DEVICE_ATTR_RO(bMaxPower);
65
66static ssize_t configuration_show(struct device *dev,
67 struct device_attribute *attr, char *buf)
68{
69 struct usb_device *udev;
70 struct usb_host_config *actconfig;
71 ssize_t rc;
72
73 udev = to_usb_device(dev);
74 rc = usb_lock_device_interruptible(udev);
75 if (rc < 0)
76 return -EINTR;
77 actconfig = udev->actconfig;
78 if (actconfig && actconfig->string)
79 rc = sprintf(buf, "%s\n", actconfig->string);
80 usb_unlock_device(udev);
81 return rc;
82}
83static DEVICE_ATTR_RO(configuration);
84
85/* configuration value is always present, and r/w */
86usb_actconfig_show(bConfigurationValue, "%u\n");
87
88static ssize_t bConfigurationValue_store(struct device *dev,
89 struct device_attribute *attr,
90 const char *buf, size_t count)
91{
92 struct usb_device *udev = to_usb_device(dev);
93 int config, value, rc;
94
95 if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
96 return -EINVAL;
97 rc = usb_lock_device_interruptible(udev);
98 if (rc < 0)
99 return -EINTR;
100 value = usb_set_configuration(udev, config);
101 usb_unlock_device(udev);
102 return (value < 0) ? value : count;
103}
104static DEVICE_ATTR_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,
105 bConfigurationValue_show, bConfigurationValue_store);
106
107/* String fields */
108#define usb_string_attr(name) \
109static ssize_t name##_show(struct device *dev, \
110 struct device_attribute *attr, char *buf) \
111{ \
112 struct usb_device *udev; \
113 int retval; \
114 \
115 udev = to_usb_device(dev); \
116 retval = usb_lock_device_interruptible(udev); \
117 if (retval < 0) \
118 return -EINTR; \
119 retval = sprintf(buf, "%s\n", udev->name); \
120 usb_unlock_device(udev); \
121 return retval; \
122} \
123static DEVICE_ATTR_RO(name)
124
125usb_string_attr(product);
126usb_string_attr(manufacturer);
127usb_string_attr(serial);
128
129static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
130 char *buf)
131{
132 struct usb_device *udev;
133 char *speed;
134
135 udev = to_usb_device(dev);
136
137 switch (udev->speed) {
138 case USB_SPEED_LOW:
139 speed = "1.5";
140 break;
141 case USB_SPEED_UNKNOWN:
142 case USB_SPEED_FULL:
143 speed = "12";
144 break;
145 case USB_SPEED_HIGH:
146 speed = "480";
147 break;
148 case USB_SPEED_WIRELESS:
149 speed = "480";
150 break;
151 case USB_SPEED_SUPER:
152 speed = "5000";
153 break;
154 case USB_SPEED_SUPER_PLUS:
155 speed = "10000";
156 break;
157 default:
158 speed = "unknown";
159 }
160 return sprintf(buf, "%s\n", speed);
161}
162static DEVICE_ATTR_RO(speed);
163
164static ssize_t busnum_show(struct device *dev, struct device_attribute *attr,
165 char *buf)
166{
167 struct usb_device *udev;
168
169 udev = to_usb_device(dev);
170 return sprintf(buf, "%d\n", udev->bus->busnum);
171}
172static DEVICE_ATTR_RO(busnum);
173
174static ssize_t devnum_show(struct device *dev, struct device_attribute *attr,
175 char *buf)
176{
177 struct usb_device *udev;
178
179 udev = to_usb_device(dev);
180 return sprintf(buf, "%d\n", udev->devnum);
181}
182static DEVICE_ATTR_RO(devnum);
183
184static ssize_t devpath_show(struct device *dev, struct device_attribute *attr,
185 char *buf)
186{
187 struct usb_device *udev;
188
189 udev = to_usb_device(dev);
190 return sprintf(buf, "%s\n", udev->devpath);
191}
192static DEVICE_ATTR_RO(devpath);
193
194static ssize_t version_show(struct device *dev, struct device_attribute *attr,
195 char *buf)
196{
197 struct usb_device *udev;
198 u16 bcdUSB;
199
200 udev = to_usb_device(dev);
201 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
202 return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
203}
204static DEVICE_ATTR_RO(version);
205
206static ssize_t maxchild_show(struct device *dev, struct device_attribute *attr,
207 char *buf)
208{
209 struct usb_device *udev;
210
211 udev = to_usb_device(dev);
212 return sprintf(buf, "%d\n", udev->maxchild);
213}
214static DEVICE_ATTR_RO(maxchild);
215
216static ssize_t quirks_show(struct device *dev, struct device_attribute *attr,
217 char *buf)
218{
219 struct usb_device *udev;
220
221 udev = to_usb_device(dev);
222 return sprintf(buf, "0x%x\n", udev->quirks);
223}
224static DEVICE_ATTR_RO(quirks);
225
226static ssize_t avoid_reset_quirk_show(struct device *dev,
227 struct device_attribute *attr, char *buf)
228{
229 struct usb_device *udev;
230
231 udev = to_usb_device(dev);
232 return sprintf(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET));
233}
234
235static ssize_t avoid_reset_quirk_store(struct device *dev,
236 struct device_attribute *attr,
237 const char *buf, size_t count)
238{
239 struct usb_device *udev = to_usb_device(dev);
240 int val, rc;
241
242 if (sscanf(buf, "%d", &val) != 1 || val < 0 || val > 1)
243 return -EINVAL;
244 rc = usb_lock_device_interruptible(udev);
245 if (rc < 0)
246 return -EINTR;
247 if (val)
248 udev->quirks |= USB_QUIRK_RESET;
249 else
250 udev->quirks &= ~USB_QUIRK_RESET;
251 usb_unlock_device(udev);
252 return count;
253}
254static DEVICE_ATTR_RW(avoid_reset_quirk);
255
256static ssize_t urbnum_show(struct device *dev, struct device_attribute *attr,
257 char *buf)
258{
259 struct usb_device *udev;
260
261 udev = to_usb_device(dev);
262 return sprintf(buf, "%d\n", atomic_read(&udev->urbnum));
263}
264static DEVICE_ATTR_RO(urbnum);
265
266static ssize_t removable_show(struct device *dev, struct device_attribute *attr,
267 char *buf)
268{
269 struct usb_device *udev;
270 char *state;
271
272 udev = to_usb_device(dev);
273
274 switch (udev->removable) {
275 case USB_DEVICE_REMOVABLE:
276 state = "removable";
277 break;
278 case USB_DEVICE_FIXED:
279 state = "fixed";
280 break;
281 default:
282 state = "unknown";
283 }
284
285 return sprintf(buf, "%s\n", state);
286}
287static DEVICE_ATTR_RO(removable);
288
289static ssize_t ltm_capable_show(struct device *dev,
290 struct device_attribute *attr, char *buf)
291{
292 if (usb_device_supports_ltm(to_usb_device(dev)))
293 return sprintf(buf, "%s\n", "yes");
294 return sprintf(buf, "%s\n", "no");
295}
296static DEVICE_ATTR_RO(ltm_capable);
297
298#ifdef CONFIG_PM
299
300static ssize_t persist_show(struct device *dev, struct device_attribute *attr,
301 char *buf)
302{
303 struct usb_device *udev = to_usb_device(dev);
304
305 return sprintf(buf, "%d\n", udev->persist_enabled);
306}
307
308static ssize_t persist_store(struct device *dev, struct device_attribute *attr,
309 const char *buf, size_t count)
310{
311 struct usb_device *udev = to_usb_device(dev);
312 int value, rc;
313
314 /* Hubs are always enabled for USB_PERSIST */
315 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
316 return -EPERM;
317
318 if (sscanf(buf, "%d", &value) != 1)
319 return -EINVAL;
320
321 rc = usb_lock_device_interruptible(udev);
322 if (rc < 0)
323 return -EINTR;
324 udev->persist_enabled = !!value;
325 usb_unlock_device(udev);
326 return count;
327}
328static DEVICE_ATTR_RW(persist);
329
330static int add_persist_attributes(struct device *dev)
331{
332 int rc = 0;
333
334 if (is_usb_device(dev)) {
335 struct usb_device *udev = to_usb_device(dev);
336
337 /* Hubs are automatically enabled for USB_PERSIST,
338 * no point in creating the attribute file.
339 */
340 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
341 rc = sysfs_add_file_to_group(&dev->kobj,
342 &dev_attr_persist.attr,
343 power_group_name);
344 }
345 return rc;
346}
347
348static void remove_persist_attributes(struct device *dev)
349{
350 sysfs_remove_file_from_group(&dev->kobj,
351 &dev_attr_persist.attr,
352 power_group_name);
353}
354
355static ssize_t connected_duration_show(struct device *dev,
356 struct device_attribute *attr, char *buf)
357{
358 struct usb_device *udev = to_usb_device(dev);
359
360 return sprintf(buf, "%u\n",
361 jiffies_to_msecs(jiffies - udev->connect_time));
362}
363static DEVICE_ATTR_RO(connected_duration);
364
365/*
366 * If the device is resumed, the last time the device was suspended has
367 * been pre-subtracted from active_duration. We add the current time to
368 * get the duration that the device was actually active.
369 *
370 * If the device is suspended, the active_duration is up-to-date.
371 */
372static ssize_t active_duration_show(struct device *dev,
373 struct device_attribute *attr, char *buf)
374{
375 struct usb_device *udev = to_usb_device(dev);
376 int duration;
377
378 if (udev->state != USB_STATE_SUSPENDED)
379 duration = jiffies_to_msecs(jiffies + udev->active_duration);
380 else
381 duration = jiffies_to_msecs(udev->active_duration);
382 return sprintf(buf, "%u\n", duration);
383}
384static DEVICE_ATTR_RO(active_duration);
385
386static ssize_t autosuspend_show(struct device *dev,
387 struct device_attribute *attr, char *buf)
388{
389 return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000);
390}
391
392static ssize_t autosuspend_store(struct device *dev,
393 struct device_attribute *attr, const char *buf,
394 size_t count)
395{
396 int value;
397
398 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
399 value <= -INT_MAX/1000)
400 return -EINVAL;
401
402 pm_runtime_set_autosuspend_delay(dev, value * 1000);
403 return count;
404}
405static DEVICE_ATTR_RW(autosuspend);
406
407static const char on_string[] = "on";
408static const char auto_string[] = "auto";
409
410static void warn_level(void)
411{
412 static int level_warned;
413
414 if (!level_warned) {
415 level_warned = 1;
416 printk(KERN_WARNING "WARNING! power/level is deprecated; "
417 "use power/control instead\n");
418 }
419}
420
421static ssize_t level_show(struct device *dev, struct device_attribute *attr,
422 char *buf)
423{
424 struct usb_device *udev = to_usb_device(dev);
425 const char *p = auto_string;
426
427 warn_level();
428 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
429 p = on_string;
430 return sprintf(buf, "%s\n", p);
431}
432
433static ssize_t level_store(struct device *dev, struct device_attribute *attr,
434 const char *buf, size_t count)
435{
436 struct usb_device *udev = to_usb_device(dev);
437 int len = count;
438 char *cp;
439 int rc = count;
440 int rv;
441
442 warn_level();
443 cp = memchr(buf, '\n', count);
444 if (cp)
445 len = cp - buf;
446
447 rv = usb_lock_device_interruptible(udev);
448 if (rv < 0)
449 return -EINTR;
450
451 if (len == sizeof on_string - 1 &&
452 strncmp(buf, on_string, len) == 0)
453 usb_disable_autosuspend(udev);
454
455 else if (len == sizeof auto_string - 1 &&
456 strncmp(buf, auto_string, len) == 0)
457 usb_enable_autosuspend(udev);
458
459 else
460 rc = -EINVAL;
461
462 usb_unlock_device(udev);
463 return rc;
464}
465static DEVICE_ATTR_RW(level);
466
467static ssize_t usb2_hardware_lpm_show(struct device *dev,
468 struct device_attribute *attr, char *buf)
469{
470 struct usb_device *udev = to_usb_device(dev);
471 const char *p;
472
473 if (udev->usb2_hw_lpm_allowed == 1)
474 p = "enabled";
475 else
476 p = "disabled";
477
478 return sprintf(buf, "%s\n", p);
479}
480
481static ssize_t usb2_hardware_lpm_store(struct device *dev,
482 struct device_attribute *attr,
483 const char *buf, size_t count)
484{
485 struct usb_device *udev = to_usb_device(dev);
486 bool value;
487 int ret;
488
489 ret = usb_lock_device_interruptible(udev);
490 if (ret < 0)
491 return -EINTR;
492
493 ret = strtobool(buf, &value);
494
495 if (!ret) {
496 udev->usb2_hw_lpm_allowed = value;
497 ret = usb_set_usb2_hardware_lpm(udev, value);
498 }
499
500 usb_unlock_device(udev);
501
502 if (!ret)
503 return count;
504
505 return ret;
506}
507static DEVICE_ATTR_RW(usb2_hardware_lpm);
508
509static ssize_t usb2_lpm_l1_timeout_show(struct device *dev,
510 struct device_attribute *attr,
511 char *buf)
512{
513 struct usb_device *udev = to_usb_device(dev);
514 return sprintf(buf, "%d\n", udev->l1_params.timeout);
515}
516
517static ssize_t usb2_lpm_l1_timeout_store(struct device *dev,
518 struct device_attribute *attr,
519 const char *buf, size_t count)
520{
521 struct usb_device *udev = to_usb_device(dev);
522 u16 timeout;
523
524 if (kstrtou16(buf, 0, &timeout))
525 return -EINVAL;
526
527 udev->l1_params.timeout = timeout;
528
529 return count;
530}
531static DEVICE_ATTR_RW(usb2_lpm_l1_timeout);
532
533static ssize_t usb2_lpm_besl_show(struct device *dev,
534 struct device_attribute *attr, char *buf)
535{
536 struct usb_device *udev = to_usb_device(dev);
537 return sprintf(buf, "%d\n", udev->l1_params.besl);
538}
539
540static ssize_t usb2_lpm_besl_store(struct device *dev,
541 struct device_attribute *attr,
542 const char *buf, size_t count)
543{
544 struct usb_device *udev = to_usb_device(dev);
545 u8 besl;
546
547 if (kstrtou8(buf, 0, &besl) || besl > 15)
548 return -EINVAL;
549
550 udev->l1_params.besl = besl;
551
552 return count;
553}
554static DEVICE_ATTR_RW(usb2_lpm_besl);
555
556static ssize_t usb3_hardware_lpm_u1_show(struct device *dev,
557 struct device_attribute *attr, char *buf)
558{
559 struct usb_device *udev = to_usb_device(dev);
560 const char *p;
561 int rc;
562
563 rc = usb_lock_device_interruptible(udev);
564 if (rc < 0)
565 return -EINTR;
566
567 if (udev->usb3_lpm_u1_enabled)
568 p = "enabled";
569 else
570 p = "disabled";
571
572 usb_unlock_device(udev);
573
574 return sprintf(buf, "%s\n", p);
575}
576static DEVICE_ATTR_RO(usb3_hardware_lpm_u1);
577
578static ssize_t usb3_hardware_lpm_u2_show(struct device *dev,
579 struct device_attribute *attr, char *buf)
580{
581 struct usb_device *udev = to_usb_device(dev);
582 const char *p;
583 int rc;
584
585 rc = usb_lock_device_interruptible(udev);
586 if (rc < 0)
587 return -EINTR;
588
589 if (udev->usb3_lpm_u2_enabled)
590 p = "enabled";
591 else
592 p = "disabled";
593
594 usb_unlock_device(udev);
595
596 return sprintf(buf, "%s\n", p);
597}
598static DEVICE_ATTR_RO(usb3_hardware_lpm_u2);
599
600static struct attribute *usb2_hardware_lpm_attr[] = {
601 &dev_attr_usb2_hardware_lpm.attr,
602 &dev_attr_usb2_lpm_l1_timeout.attr,
603 &dev_attr_usb2_lpm_besl.attr,
604 NULL,
605};
606static struct attribute_group usb2_hardware_lpm_attr_group = {
607 .name = power_group_name,
608 .attrs = usb2_hardware_lpm_attr,
609};
610
611static struct attribute *usb3_hardware_lpm_attr[] = {
612 &dev_attr_usb3_hardware_lpm_u1.attr,
613 &dev_attr_usb3_hardware_lpm_u2.attr,
614 NULL,
615};
616static struct attribute_group usb3_hardware_lpm_attr_group = {
617 .name = power_group_name,
618 .attrs = usb3_hardware_lpm_attr,
619};
620
621static struct attribute *power_attrs[] = {
622 &dev_attr_autosuspend.attr,
623 &dev_attr_level.attr,
624 &dev_attr_connected_duration.attr,
625 &dev_attr_active_duration.attr,
626 NULL,
627};
628static struct attribute_group power_attr_group = {
629 .name = power_group_name,
630 .attrs = power_attrs,
631};
632
633static int add_power_attributes(struct device *dev)
634{
635 int rc = 0;
636
637 if (is_usb_device(dev)) {
638 struct usb_device *udev = to_usb_device(dev);
639 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
640 if (udev->usb2_hw_lpm_capable == 1)
641 rc = sysfs_merge_group(&dev->kobj,
642 &usb2_hardware_lpm_attr_group);
643 if (udev->speed == USB_SPEED_SUPER &&
644 udev->lpm_capable == 1)
645 rc = sysfs_merge_group(&dev->kobj,
646 &usb3_hardware_lpm_attr_group);
647 }
648
649 return rc;
650}
651
652static void remove_power_attributes(struct device *dev)
653{
654 sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
655 sysfs_unmerge_group(&dev->kobj, &power_attr_group);
656}
657
658#else
659
660#define add_persist_attributes(dev) 0
661#define remove_persist_attributes(dev) do {} while (0)
662
663#define add_power_attributes(dev) 0
664#define remove_power_attributes(dev) do {} while (0)
665
666#endif /* CONFIG_PM */
667
668
669/* Descriptor fields */
670#define usb_descriptor_attr_le16(field, format_string) \
671static ssize_t \
672field##_show(struct device *dev, struct device_attribute *attr, \
673 char *buf) \
674{ \
675 struct usb_device *udev; \
676 \
677 udev = to_usb_device(dev); \
678 return sprintf(buf, format_string, \
679 le16_to_cpu(udev->descriptor.field)); \
680} \
681static DEVICE_ATTR_RO(field)
682
683usb_descriptor_attr_le16(idVendor, "%04x\n");
684usb_descriptor_attr_le16(idProduct, "%04x\n");
685usb_descriptor_attr_le16(bcdDevice, "%04x\n");
686
687#define usb_descriptor_attr(field, format_string) \
688static ssize_t \
689field##_show(struct device *dev, struct device_attribute *attr, \
690 char *buf) \
691{ \
692 struct usb_device *udev; \
693 \
694 udev = to_usb_device(dev); \
695 return sprintf(buf, format_string, udev->descriptor.field); \
696} \
697static DEVICE_ATTR_RO(field)
698
699usb_descriptor_attr(bDeviceClass, "%02x\n");
700usb_descriptor_attr(bDeviceSubClass, "%02x\n");
701usb_descriptor_attr(bDeviceProtocol, "%02x\n");
702usb_descriptor_attr(bNumConfigurations, "%d\n");
703usb_descriptor_attr(bMaxPacketSize0, "%d\n");
704
705
706/* show if the device is authorized (1) or not (0) */
707static ssize_t authorized_show(struct device *dev,
708 struct device_attribute *attr, char *buf)
709{
710 struct usb_device *usb_dev = to_usb_device(dev);
711 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
712}
713
714/*
715 * Authorize a device to be used in the system
716 *
717 * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
718 */
719static ssize_t authorized_store(struct device *dev,
720 struct device_attribute *attr, const char *buf,
721 size_t size)
722{
723 ssize_t result;
724 struct usb_device *usb_dev = to_usb_device(dev);
725 unsigned val;
726 result = sscanf(buf, "%u\n", &val);
727 if (result != 1)
728 result = -EINVAL;
729 else if (val == 0)
730 result = usb_deauthorize_device(usb_dev);
731 else
732 result = usb_authorize_device(usb_dev);
733 return result < 0 ? result : size;
734}
735static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, S_IRUGO | S_IWUSR,
736 authorized_show, authorized_store);
737
738/* "Safely remove a device" */
739static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
740 const char *buf, size_t count)
741{
742 struct usb_device *udev = to_usb_device(dev);
743 int rc = 0;
744
745 usb_lock_device(udev);
746 if (udev->state != USB_STATE_NOTATTACHED) {
747
748 /* To avoid races, first unconfigure and then remove */
749 usb_set_configuration(udev, -1);
750 rc = usb_remove_device(udev);
751 }
752 if (rc == 0)
753 rc = count;
754 usb_unlock_device(udev);
755 return rc;
756}
757static DEVICE_ATTR_IGNORE_LOCKDEP(remove, S_IWUSR, NULL, remove_store);
758
759
760static struct attribute *dev_attrs[] = {
761 /* current configuration's attributes */
762 &dev_attr_configuration.attr,
763 &dev_attr_bNumInterfaces.attr,
764 &dev_attr_bConfigurationValue.attr,
765 &dev_attr_bmAttributes.attr,
766 &dev_attr_bMaxPower.attr,
767 /* device attributes */
768 &dev_attr_urbnum.attr,
769 &dev_attr_idVendor.attr,
770 &dev_attr_idProduct.attr,
771 &dev_attr_bcdDevice.attr,
772 &dev_attr_bDeviceClass.attr,
773 &dev_attr_bDeviceSubClass.attr,
774 &dev_attr_bDeviceProtocol.attr,
775 &dev_attr_bNumConfigurations.attr,
776 &dev_attr_bMaxPacketSize0.attr,
777 &dev_attr_speed.attr,
778 &dev_attr_busnum.attr,
779 &dev_attr_devnum.attr,
780 &dev_attr_devpath.attr,
781 &dev_attr_version.attr,
782 &dev_attr_maxchild.attr,
783 &dev_attr_quirks.attr,
784 &dev_attr_avoid_reset_quirk.attr,
785 &dev_attr_authorized.attr,
786 &dev_attr_remove.attr,
787 &dev_attr_removable.attr,
788 &dev_attr_ltm_capable.attr,
789 NULL,
790};
791static struct attribute_group dev_attr_grp = {
792 .attrs = dev_attrs,
793};
794
795/* When modifying this list, be sure to modify dev_string_attrs_are_visible()
796 * accordingly.
797 */
798static struct attribute *dev_string_attrs[] = {
799 &dev_attr_manufacturer.attr,
800 &dev_attr_product.attr,
801 &dev_attr_serial.attr,
802 NULL
803};
804
805static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
806 struct attribute *a, int n)
807{
808 struct device *dev = container_of(kobj, struct device, kobj);
809 struct usb_device *udev = to_usb_device(dev);
810
811 if (a == &dev_attr_manufacturer.attr) {
812 if (udev->manufacturer == NULL)
813 return 0;
814 } else if (a == &dev_attr_product.attr) {
815 if (udev->product == NULL)
816 return 0;
817 } else if (a == &dev_attr_serial.attr) {
818 if (udev->serial == NULL)
819 return 0;
820 }
821 return a->mode;
822}
823
824static struct attribute_group dev_string_attr_grp = {
825 .attrs = dev_string_attrs,
826 .is_visible = dev_string_attrs_are_visible,
827};
828
829const struct attribute_group *usb_device_groups[] = {
830 &dev_attr_grp,
831 &dev_string_attr_grp,
832 NULL
833};
834
835/* Binary descriptors */
836
837static ssize_t
838read_descriptors(struct file *filp, struct kobject *kobj,
839 struct bin_attribute *attr,
840 char *buf, loff_t off, size_t count)
841{
842 struct device *dev = container_of(kobj, struct device, kobj);
843 struct usb_device *udev = to_usb_device(dev);
844 size_t nleft = count;
845 size_t srclen, n;
846 int cfgno;
847 void *src;
848
849 /* The binary attribute begins with the device descriptor.
850 * Following that are the raw descriptor entries for all the
851 * configurations (config plus subsidiary descriptors).
852 */
853 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
854 nleft > 0; ++cfgno) {
855 if (cfgno < 0) {
856 src = &udev->descriptor;
857 srclen = sizeof(struct usb_device_descriptor);
858 } else {
859 src = udev->rawdescriptors[cfgno];
860 srclen = __le16_to_cpu(udev->config[cfgno].desc.
861 wTotalLength);
862 }
863 if (off < srclen) {
864 n = min(nleft, srclen - (size_t) off);
865 memcpy(buf, src + off, n);
866 nleft -= n;
867 buf += n;
868 off = 0;
869 } else {
870 off -= srclen;
871 }
872 }
873 return count - nleft;
874}
875
876static struct bin_attribute dev_bin_attr_descriptors = {
877 .attr = {.name = "descriptors", .mode = 0444},
878 .read = read_descriptors,
879 .size = 18 + 65535, /* dev descr + max-size raw descriptor */
880};
881
882int usb_create_sysfs_dev_files(struct usb_device *udev)
883{
884 struct device *dev = &udev->dev;
885 int retval;
886
887 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
888 if (retval)
889 goto error;
890
891 retval = add_persist_attributes(dev);
892 if (retval)
893 goto error;
894
895 retval = add_power_attributes(dev);
896 if (retval)
897 goto error;
898 return retval;
899error:
900 usb_remove_sysfs_dev_files(udev);
901 return retval;
902}
903
904void usb_remove_sysfs_dev_files(struct usb_device *udev)
905{
906 struct device *dev = &udev->dev;
907
908 remove_power_attributes(dev);
909 remove_persist_attributes(dev);
910 device_remove_bin_file(dev, &dev_bin_attr_descriptors);
911}
912
913/* Interface Association Descriptor fields */
914#define usb_intf_assoc_attr(field, format_string) \
915static ssize_t \
916iad_##field##_show(struct device *dev, struct device_attribute *attr, \
917 char *buf) \
918{ \
919 struct usb_interface *intf = to_usb_interface(dev); \
920 \
921 return sprintf(buf, format_string, \
922 intf->intf_assoc->field); \
923} \
924static DEVICE_ATTR_RO(iad_##field)
925
926usb_intf_assoc_attr(bFirstInterface, "%02x\n");
927usb_intf_assoc_attr(bInterfaceCount, "%02d\n");
928usb_intf_assoc_attr(bFunctionClass, "%02x\n");
929usb_intf_assoc_attr(bFunctionSubClass, "%02x\n");
930usb_intf_assoc_attr(bFunctionProtocol, "%02x\n");
931
932/* Interface fields */
933#define usb_intf_attr(field, format_string) \
934static ssize_t \
935field##_show(struct device *dev, struct device_attribute *attr, \
936 char *buf) \
937{ \
938 struct usb_interface *intf = to_usb_interface(dev); \
939 \
940 return sprintf(buf, format_string, \
941 intf->cur_altsetting->desc.field); \
942} \
943static DEVICE_ATTR_RO(field)
944
945usb_intf_attr(bInterfaceNumber, "%02x\n");
946usb_intf_attr(bAlternateSetting, "%2d\n");
947usb_intf_attr(bNumEndpoints, "%02x\n");
948usb_intf_attr(bInterfaceClass, "%02x\n");
949usb_intf_attr(bInterfaceSubClass, "%02x\n");
950usb_intf_attr(bInterfaceProtocol, "%02x\n");
951
952static ssize_t interface_show(struct device *dev, struct device_attribute *attr,
953 char *buf)
954{
955 struct usb_interface *intf;
956 char *string;
957
958 intf = to_usb_interface(dev);
959 string = ACCESS_ONCE(intf->cur_altsetting->string);
960 if (!string)
961 return 0;
962 return sprintf(buf, "%s\n", string);
963}
964static DEVICE_ATTR_RO(interface);
965
966static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
967 char *buf)
968{
969 struct usb_interface *intf;
970 struct usb_device *udev;
971 struct usb_host_interface *alt;
972
973 intf = to_usb_interface(dev);
974 udev = interface_to_usbdev(intf);
975 alt = ACCESS_ONCE(intf->cur_altsetting);
976
977 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
978 "ic%02Xisc%02Xip%02Xin%02X\n",
979 le16_to_cpu(udev->descriptor.idVendor),
980 le16_to_cpu(udev->descriptor.idProduct),
981 le16_to_cpu(udev->descriptor.bcdDevice),
982 udev->descriptor.bDeviceClass,
983 udev->descriptor.bDeviceSubClass,
984 udev->descriptor.bDeviceProtocol,
985 alt->desc.bInterfaceClass,
986 alt->desc.bInterfaceSubClass,
987 alt->desc.bInterfaceProtocol,
988 alt->desc.bInterfaceNumber);
989}
990static DEVICE_ATTR_RO(modalias);
991
992static ssize_t supports_autosuspend_show(struct device *dev,
993 struct device_attribute *attr,
994 char *buf)
995{
996 int s;
997
998 s = device_lock_interruptible(dev);
999 if (s < 0)
1000 return -EINTR;
1001 /* Devices will be autosuspended even when an interface isn't claimed */
1002 s = (!dev->driver || to_usb_driver(dev->driver)->supports_autosuspend);
1003 device_unlock(dev);
1004
1005 return sprintf(buf, "%u\n", s);
1006}
1007static DEVICE_ATTR_RO(supports_autosuspend);
1008
1009/*
1010 * interface_authorized_show - show authorization status of an USB interface
1011 * 1 is authorized, 0 is deauthorized
1012 */
1013static ssize_t interface_authorized_show(struct device *dev,
1014 struct device_attribute *attr, char *buf)
1015{
1016 struct usb_interface *intf = to_usb_interface(dev);
1017
1018 return sprintf(buf, "%u\n", intf->authorized);
1019}
1020
1021/*
1022 * interface_authorized_store - authorize or deauthorize an USB interface
1023 */
1024static ssize_t interface_authorized_store(struct device *dev,
1025 struct device_attribute *attr, const char *buf, size_t count)
1026{
1027 struct usb_interface *intf = to_usb_interface(dev);
1028 bool val;
1029
1030 if (strtobool(buf, &val) != 0)
1031 return -EINVAL;
1032
1033 if (val)
1034 usb_authorize_interface(intf);
1035 else
1036 usb_deauthorize_interface(intf);
1037
1038 return count;
1039}
1040static struct device_attribute dev_attr_interface_authorized =
1041 __ATTR(authorized, S_IRUGO | S_IWUSR,
1042 interface_authorized_show, interface_authorized_store);
1043
1044static struct attribute *intf_attrs[] = {
1045 &dev_attr_bInterfaceNumber.attr,
1046 &dev_attr_bAlternateSetting.attr,
1047 &dev_attr_bNumEndpoints.attr,
1048 &dev_attr_bInterfaceClass.attr,
1049 &dev_attr_bInterfaceSubClass.attr,
1050 &dev_attr_bInterfaceProtocol.attr,
1051 &dev_attr_modalias.attr,
1052 &dev_attr_supports_autosuspend.attr,
1053 &dev_attr_interface_authorized.attr,
1054 NULL,
1055};
1056static struct attribute_group intf_attr_grp = {
1057 .attrs = intf_attrs,
1058};
1059
1060static struct attribute *intf_assoc_attrs[] = {
1061 &dev_attr_iad_bFirstInterface.attr,
1062 &dev_attr_iad_bInterfaceCount.attr,
1063 &dev_attr_iad_bFunctionClass.attr,
1064 &dev_attr_iad_bFunctionSubClass.attr,
1065 &dev_attr_iad_bFunctionProtocol.attr,
1066 NULL,
1067};
1068
1069static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
1070 struct attribute *a, int n)
1071{
1072 struct device *dev = container_of(kobj, struct device, kobj);
1073 struct usb_interface *intf = to_usb_interface(dev);
1074
1075 if (intf->intf_assoc == NULL)
1076 return 0;
1077 return a->mode;
1078}
1079
1080static struct attribute_group intf_assoc_attr_grp = {
1081 .attrs = intf_assoc_attrs,
1082 .is_visible = intf_assoc_attrs_are_visible,
1083};
1084
1085const struct attribute_group *usb_interface_groups[] = {
1086 &intf_attr_grp,
1087 &intf_assoc_attr_grp,
1088 NULL
1089};
1090
1091void usb_create_sysfs_intf_files(struct usb_interface *intf)
1092{
1093 struct usb_device *udev = interface_to_usbdev(intf);
1094 struct usb_host_interface *alt = intf->cur_altsetting;
1095
1096 if (intf->sysfs_files_created || intf->unregistering)
1097 return;
1098
1099 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
1100 alt->string = usb_cache_string(udev, alt->desc.iInterface);
1101 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface))
1102 ; /* We don't actually care if the function fails. */
1103 intf->sysfs_files_created = 1;
1104}
1105
1106void usb_remove_sysfs_intf_files(struct usb_interface *intf)
1107{
1108 if (!intf->sysfs_files_created)
1109 return;
1110
1111 device_remove_file(&intf->dev, &dev_attr_interface);
1112 intf->sysfs_files_created = 0;
1113}
1/*
2 * drivers/usb/core/sysfs.c
3 *
4 * (C) Copyright 2002 David Brownell
5 * (C) Copyright 2002,2004 Greg Kroah-Hartman
6 * (C) Copyright 2002,2004 IBM Corp.
7 *
8 * All of the sysfs file attributes for usb devices and interfaces.
9 *
10 */
11
12
13#include <linux/kernel.h>
14#include <linux/string.h>
15#include <linux/usb.h>
16#include <linux/usb/quirks.h>
17#include "usb.h"
18
19/* Active configuration fields */
20#define usb_actconfig_show(field, format_string) \
21static ssize_t field##_show(struct device *dev, \
22 struct device_attribute *attr, char *buf) \
23{ \
24 struct usb_device *udev; \
25 struct usb_host_config *actconfig; \
26 ssize_t rc = 0; \
27 \
28 udev = to_usb_device(dev); \
29 usb_lock_device(udev); \
30 actconfig = udev->actconfig; \
31 if (actconfig) \
32 rc = sprintf(buf, format_string, \
33 actconfig->desc.field); \
34 usb_unlock_device(udev); \
35 return rc; \
36} \
37
38#define usb_actconfig_attr(field, format_string) \
39 usb_actconfig_show(field, format_string) \
40 static DEVICE_ATTR_RO(field)
41
42usb_actconfig_attr(bNumInterfaces, "%2d\n");
43usb_actconfig_attr(bmAttributes, "%2x\n");
44
45static ssize_t bMaxPower_show(struct device *dev,
46 struct device_attribute *attr, char *buf)
47{
48 struct usb_device *udev;
49 struct usb_host_config *actconfig;
50 ssize_t rc = 0;
51
52 udev = to_usb_device(dev);
53 usb_lock_device(udev);
54 actconfig = udev->actconfig;
55 if (actconfig)
56 rc = sprintf(buf, "%dmA\n", usb_get_max_power(udev, actconfig));
57 usb_unlock_device(udev);
58 return rc;
59}
60static DEVICE_ATTR_RO(bMaxPower);
61
62static ssize_t configuration_show(struct device *dev,
63 struct device_attribute *attr, char *buf)
64{
65 struct usb_device *udev;
66 struct usb_host_config *actconfig;
67 ssize_t rc = 0;
68
69 udev = to_usb_device(dev);
70 usb_lock_device(udev);
71 actconfig = udev->actconfig;
72 if (actconfig && actconfig->string)
73 rc = sprintf(buf, "%s\n", actconfig->string);
74 usb_unlock_device(udev);
75 return rc;
76}
77static DEVICE_ATTR_RO(configuration);
78
79/* configuration value is always present, and r/w */
80usb_actconfig_show(bConfigurationValue, "%u\n");
81
82static ssize_t bConfigurationValue_store(struct device *dev,
83 struct device_attribute *attr,
84 const char *buf, size_t count)
85{
86 struct usb_device *udev = to_usb_device(dev);
87 int config, value;
88
89 if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
90 return -EINVAL;
91 usb_lock_device(udev);
92 value = usb_set_configuration(udev, config);
93 usb_unlock_device(udev);
94 return (value < 0) ? value : count;
95}
96static DEVICE_ATTR_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,
97 bConfigurationValue_show, bConfigurationValue_store);
98
99/* String fields */
100#define usb_string_attr(name) \
101static ssize_t name##_show(struct device *dev, \
102 struct device_attribute *attr, char *buf) \
103{ \
104 struct usb_device *udev; \
105 int retval; \
106 \
107 udev = to_usb_device(dev); \
108 usb_lock_device(udev); \
109 retval = sprintf(buf, "%s\n", udev->name); \
110 usb_unlock_device(udev); \
111 return retval; \
112} \
113static DEVICE_ATTR_RO(name)
114
115usb_string_attr(product);
116usb_string_attr(manufacturer);
117usb_string_attr(serial);
118
119static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
120 char *buf)
121{
122 struct usb_device *udev;
123 char *speed;
124
125 udev = to_usb_device(dev);
126
127 switch (udev->speed) {
128 case USB_SPEED_LOW:
129 speed = "1.5";
130 break;
131 case USB_SPEED_UNKNOWN:
132 case USB_SPEED_FULL:
133 speed = "12";
134 break;
135 case USB_SPEED_HIGH:
136 speed = "480";
137 break;
138 case USB_SPEED_WIRELESS:
139 speed = "480";
140 break;
141 case USB_SPEED_SUPER:
142 speed = "5000";
143 break;
144 default:
145 speed = "unknown";
146 }
147 return sprintf(buf, "%s\n", speed);
148}
149static DEVICE_ATTR_RO(speed);
150
151static ssize_t busnum_show(struct device *dev, struct device_attribute *attr,
152 char *buf)
153{
154 struct usb_device *udev;
155
156 udev = to_usb_device(dev);
157 return sprintf(buf, "%d\n", udev->bus->busnum);
158}
159static DEVICE_ATTR_RO(busnum);
160
161static ssize_t devnum_show(struct device *dev, struct device_attribute *attr,
162 char *buf)
163{
164 struct usb_device *udev;
165
166 udev = to_usb_device(dev);
167 return sprintf(buf, "%d\n", udev->devnum);
168}
169static DEVICE_ATTR_RO(devnum);
170
171static ssize_t devpath_show(struct device *dev, struct device_attribute *attr,
172 char *buf)
173{
174 struct usb_device *udev;
175
176 udev = to_usb_device(dev);
177 return sprintf(buf, "%s\n", udev->devpath);
178}
179static DEVICE_ATTR_RO(devpath);
180
181static ssize_t version_show(struct device *dev, struct device_attribute *attr,
182 char *buf)
183{
184 struct usb_device *udev;
185 u16 bcdUSB;
186
187 udev = to_usb_device(dev);
188 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
189 return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
190}
191static DEVICE_ATTR_RO(version);
192
193static ssize_t maxchild_show(struct device *dev, struct device_attribute *attr,
194 char *buf)
195{
196 struct usb_device *udev;
197
198 udev = to_usb_device(dev);
199 return sprintf(buf, "%d\n", udev->maxchild);
200}
201static DEVICE_ATTR_RO(maxchild);
202
203static ssize_t quirks_show(struct device *dev, struct device_attribute *attr,
204 char *buf)
205{
206 struct usb_device *udev;
207
208 udev = to_usb_device(dev);
209 return sprintf(buf, "0x%x\n", udev->quirks);
210}
211static DEVICE_ATTR_RO(quirks);
212
213static ssize_t avoid_reset_quirk_show(struct device *dev,
214 struct device_attribute *attr, char *buf)
215{
216 struct usb_device *udev;
217
218 udev = to_usb_device(dev);
219 return sprintf(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET));
220}
221
222static ssize_t avoid_reset_quirk_store(struct device *dev,
223 struct device_attribute *attr,
224 const char *buf, size_t count)
225{
226 struct usb_device *udev = to_usb_device(dev);
227 int val;
228
229 if (sscanf(buf, "%d", &val) != 1 || val < 0 || val > 1)
230 return -EINVAL;
231 usb_lock_device(udev);
232 if (val)
233 udev->quirks |= USB_QUIRK_RESET;
234 else
235 udev->quirks &= ~USB_QUIRK_RESET;
236 usb_unlock_device(udev);
237 return count;
238}
239static DEVICE_ATTR_RW(avoid_reset_quirk);
240
241static ssize_t urbnum_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", atomic_read(&udev->urbnum));
248}
249static DEVICE_ATTR_RO(urbnum);
250
251static ssize_t removable_show(struct device *dev, struct device_attribute *attr,
252 char *buf)
253{
254 struct usb_device *udev;
255 char *state;
256
257 udev = to_usb_device(dev);
258
259 switch (udev->removable) {
260 case USB_DEVICE_REMOVABLE:
261 state = "removable";
262 break;
263 case USB_DEVICE_FIXED:
264 state = "fixed";
265 break;
266 default:
267 state = "unknown";
268 }
269
270 return sprintf(buf, "%s\n", state);
271}
272static DEVICE_ATTR_RO(removable);
273
274static ssize_t ltm_capable_show(struct device *dev,
275 struct device_attribute *attr, char *buf)
276{
277 if (usb_device_supports_ltm(to_usb_device(dev)))
278 return sprintf(buf, "%s\n", "yes");
279 return sprintf(buf, "%s\n", "no");
280}
281static DEVICE_ATTR_RO(ltm_capable);
282
283#ifdef CONFIG_PM
284
285static ssize_t persist_show(struct device *dev, struct device_attribute *attr,
286 char *buf)
287{
288 struct usb_device *udev = to_usb_device(dev);
289
290 return sprintf(buf, "%d\n", udev->persist_enabled);
291}
292
293static ssize_t persist_store(struct device *dev, struct device_attribute *attr,
294 const char *buf, size_t count)
295{
296 struct usb_device *udev = to_usb_device(dev);
297 int value;
298
299 /* Hubs are always enabled for USB_PERSIST */
300 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
301 return -EPERM;
302
303 if (sscanf(buf, "%d", &value) != 1)
304 return -EINVAL;
305
306 usb_lock_device(udev);
307 udev->persist_enabled = !!value;
308 usb_unlock_device(udev);
309 return count;
310}
311static DEVICE_ATTR_RW(persist);
312
313static int add_persist_attributes(struct device *dev)
314{
315 int rc = 0;
316
317 if (is_usb_device(dev)) {
318 struct usb_device *udev = to_usb_device(dev);
319
320 /* Hubs are automatically enabled for USB_PERSIST,
321 * no point in creating the attribute file.
322 */
323 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
324 rc = sysfs_add_file_to_group(&dev->kobj,
325 &dev_attr_persist.attr,
326 power_group_name);
327 }
328 return rc;
329}
330
331static void remove_persist_attributes(struct device *dev)
332{
333 sysfs_remove_file_from_group(&dev->kobj,
334 &dev_attr_persist.attr,
335 power_group_name);
336}
337#else
338
339#define add_persist_attributes(dev) 0
340#define remove_persist_attributes(dev) do {} while (0)
341
342#endif /* CONFIG_PM */
343
344#ifdef CONFIG_PM_RUNTIME
345
346static ssize_t connected_duration_show(struct device *dev,
347 struct device_attribute *attr, char *buf)
348{
349 struct usb_device *udev = to_usb_device(dev);
350
351 return sprintf(buf, "%u\n",
352 jiffies_to_msecs(jiffies - udev->connect_time));
353}
354static DEVICE_ATTR_RO(connected_duration);
355
356/*
357 * If the device is resumed, the last time the device was suspended has
358 * been pre-subtracted from active_duration. We add the current time to
359 * get the duration that the device was actually active.
360 *
361 * If the device is suspended, the active_duration is up-to-date.
362 */
363static ssize_t active_duration_show(struct device *dev,
364 struct device_attribute *attr, char *buf)
365{
366 struct usb_device *udev = to_usb_device(dev);
367 int duration;
368
369 if (udev->state != USB_STATE_SUSPENDED)
370 duration = jiffies_to_msecs(jiffies + udev->active_duration);
371 else
372 duration = jiffies_to_msecs(udev->active_duration);
373 return sprintf(buf, "%u\n", duration);
374}
375static DEVICE_ATTR_RO(active_duration);
376
377static ssize_t autosuspend_show(struct device *dev,
378 struct device_attribute *attr, char *buf)
379{
380 return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000);
381}
382
383static ssize_t autosuspend_store(struct device *dev,
384 struct device_attribute *attr, const char *buf,
385 size_t count)
386{
387 int value;
388
389 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
390 value <= -INT_MAX/1000)
391 return -EINVAL;
392
393 pm_runtime_set_autosuspend_delay(dev, value * 1000);
394 return count;
395}
396static DEVICE_ATTR_RW(autosuspend);
397
398static const char on_string[] = "on";
399static const char auto_string[] = "auto";
400
401static void warn_level(void)
402{
403 static int level_warned;
404
405 if (!level_warned) {
406 level_warned = 1;
407 printk(KERN_WARNING "WARNING! power/level is deprecated; "
408 "use power/control instead\n");
409 }
410}
411
412static ssize_t level_show(struct device *dev, struct device_attribute *attr,
413 char *buf)
414{
415 struct usb_device *udev = to_usb_device(dev);
416 const char *p = auto_string;
417
418 warn_level();
419 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
420 p = on_string;
421 return sprintf(buf, "%s\n", p);
422}
423
424static ssize_t level_store(struct device *dev, struct device_attribute *attr,
425 const char *buf, size_t count)
426{
427 struct usb_device *udev = to_usb_device(dev);
428 int len = count;
429 char *cp;
430 int rc = count;
431
432 warn_level();
433 cp = memchr(buf, '\n', count);
434 if (cp)
435 len = cp - buf;
436
437 usb_lock_device(udev);
438
439 if (len == sizeof on_string - 1 &&
440 strncmp(buf, on_string, len) == 0)
441 usb_disable_autosuspend(udev);
442
443 else if (len == sizeof auto_string - 1 &&
444 strncmp(buf, auto_string, len) == 0)
445 usb_enable_autosuspend(udev);
446
447 else
448 rc = -EINVAL;
449
450 usb_unlock_device(udev);
451 return rc;
452}
453static DEVICE_ATTR_RW(level);
454
455static ssize_t usb2_hardware_lpm_show(struct device *dev,
456 struct device_attribute *attr, char *buf)
457{
458 struct usb_device *udev = to_usb_device(dev);
459 const char *p;
460
461 if (udev->usb2_hw_lpm_allowed == 1)
462 p = "enabled";
463 else
464 p = "disabled";
465
466 return sprintf(buf, "%s\n", p);
467}
468
469static ssize_t usb2_hardware_lpm_store(struct device *dev,
470 struct device_attribute *attr,
471 const char *buf, size_t count)
472{
473 struct usb_device *udev = to_usb_device(dev);
474 bool value;
475 int ret;
476
477 usb_lock_device(udev);
478
479 ret = strtobool(buf, &value);
480
481 if (!ret) {
482 udev->usb2_hw_lpm_allowed = value;
483 ret = usb_set_usb2_hardware_lpm(udev, value);
484 }
485
486 usb_unlock_device(udev);
487
488 if (!ret)
489 return count;
490
491 return ret;
492}
493static DEVICE_ATTR_RW(usb2_hardware_lpm);
494
495static ssize_t usb2_lpm_l1_timeout_show(struct device *dev,
496 struct device_attribute *attr,
497 char *buf)
498{
499 struct usb_device *udev = to_usb_device(dev);
500 return sprintf(buf, "%d\n", udev->l1_params.timeout);
501}
502
503static ssize_t usb2_lpm_l1_timeout_store(struct device *dev,
504 struct device_attribute *attr,
505 const char *buf, size_t count)
506{
507 struct usb_device *udev = to_usb_device(dev);
508 u16 timeout;
509
510 if (kstrtou16(buf, 0, &timeout))
511 return -EINVAL;
512
513 udev->l1_params.timeout = timeout;
514
515 return count;
516}
517static DEVICE_ATTR_RW(usb2_lpm_l1_timeout);
518
519static ssize_t usb2_lpm_besl_show(struct device *dev,
520 struct device_attribute *attr, char *buf)
521{
522 struct usb_device *udev = to_usb_device(dev);
523 return sprintf(buf, "%d\n", udev->l1_params.besl);
524}
525
526static ssize_t usb2_lpm_besl_store(struct device *dev,
527 struct device_attribute *attr,
528 const char *buf, size_t count)
529{
530 struct usb_device *udev = to_usb_device(dev);
531 u8 besl;
532
533 if (kstrtou8(buf, 0, &besl) || besl > 15)
534 return -EINVAL;
535
536 udev->l1_params.besl = besl;
537
538 return count;
539}
540static DEVICE_ATTR_RW(usb2_lpm_besl);
541
542static struct attribute *usb2_hardware_lpm_attr[] = {
543 &dev_attr_usb2_hardware_lpm.attr,
544 &dev_attr_usb2_lpm_l1_timeout.attr,
545 &dev_attr_usb2_lpm_besl.attr,
546 NULL,
547};
548static struct attribute_group usb2_hardware_lpm_attr_group = {
549 .name = power_group_name,
550 .attrs = usb2_hardware_lpm_attr,
551};
552
553static struct attribute *power_attrs[] = {
554 &dev_attr_autosuspend.attr,
555 &dev_attr_level.attr,
556 &dev_attr_connected_duration.attr,
557 &dev_attr_active_duration.attr,
558 NULL,
559};
560static struct attribute_group power_attr_group = {
561 .name = power_group_name,
562 .attrs = power_attrs,
563};
564
565static int add_power_attributes(struct device *dev)
566{
567 int rc = 0;
568
569 if (is_usb_device(dev)) {
570 struct usb_device *udev = to_usb_device(dev);
571 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
572 if (udev->usb2_hw_lpm_capable == 1)
573 rc = sysfs_merge_group(&dev->kobj,
574 &usb2_hardware_lpm_attr_group);
575 }
576
577 return rc;
578}
579
580static void remove_power_attributes(struct device *dev)
581{
582 sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
583 sysfs_unmerge_group(&dev->kobj, &power_attr_group);
584}
585
586#else
587
588#define add_power_attributes(dev) 0
589#define remove_power_attributes(dev) do {} while (0)
590
591#endif /* CONFIG_PM_RUNTIME */
592
593
594/* Descriptor fields */
595#define usb_descriptor_attr_le16(field, format_string) \
596static ssize_t \
597field##_show(struct device *dev, struct device_attribute *attr, \
598 char *buf) \
599{ \
600 struct usb_device *udev; \
601 \
602 udev = to_usb_device(dev); \
603 return sprintf(buf, format_string, \
604 le16_to_cpu(udev->descriptor.field)); \
605} \
606static DEVICE_ATTR_RO(field)
607
608usb_descriptor_attr_le16(idVendor, "%04x\n");
609usb_descriptor_attr_le16(idProduct, "%04x\n");
610usb_descriptor_attr_le16(bcdDevice, "%04x\n");
611
612#define usb_descriptor_attr(field, format_string) \
613static ssize_t \
614field##_show(struct device *dev, struct device_attribute *attr, \
615 char *buf) \
616{ \
617 struct usb_device *udev; \
618 \
619 udev = to_usb_device(dev); \
620 return sprintf(buf, format_string, udev->descriptor.field); \
621} \
622static DEVICE_ATTR_RO(field)
623
624usb_descriptor_attr(bDeviceClass, "%02x\n");
625usb_descriptor_attr(bDeviceSubClass, "%02x\n");
626usb_descriptor_attr(bDeviceProtocol, "%02x\n");
627usb_descriptor_attr(bNumConfigurations, "%d\n");
628usb_descriptor_attr(bMaxPacketSize0, "%d\n");
629
630
631/* show if the device is authorized (1) or not (0) */
632static ssize_t authorized_show(struct device *dev,
633 struct device_attribute *attr, char *buf)
634{
635 struct usb_device *usb_dev = to_usb_device(dev);
636 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
637}
638
639/*
640 * Authorize a device to be used in the system
641 *
642 * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
643 */
644static ssize_t authorized_store(struct device *dev,
645 struct device_attribute *attr, const char *buf,
646 size_t size)
647{
648 ssize_t result;
649 struct usb_device *usb_dev = to_usb_device(dev);
650 unsigned val;
651 result = sscanf(buf, "%u\n", &val);
652 if (result != 1)
653 result = -EINVAL;
654 else if (val == 0)
655 result = usb_deauthorize_device(usb_dev);
656 else
657 result = usb_authorize_device(usb_dev);
658 return result < 0 ? result : size;
659}
660static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, S_IRUGO | S_IWUSR,
661 authorized_show, authorized_store);
662
663/* "Safely remove a device" */
664static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
665 const char *buf, size_t count)
666{
667 struct usb_device *udev = to_usb_device(dev);
668 int rc = 0;
669
670 usb_lock_device(udev);
671 if (udev->state != USB_STATE_NOTATTACHED) {
672
673 /* To avoid races, first unconfigure and then remove */
674 usb_set_configuration(udev, -1);
675 rc = usb_remove_device(udev);
676 }
677 if (rc == 0)
678 rc = count;
679 usb_unlock_device(udev);
680 return rc;
681}
682static DEVICE_ATTR_IGNORE_LOCKDEP(remove, S_IWUSR, NULL, remove_store);
683
684
685static struct attribute *dev_attrs[] = {
686 /* current configuration's attributes */
687 &dev_attr_configuration.attr,
688 &dev_attr_bNumInterfaces.attr,
689 &dev_attr_bConfigurationValue.attr,
690 &dev_attr_bmAttributes.attr,
691 &dev_attr_bMaxPower.attr,
692 /* device attributes */
693 &dev_attr_urbnum.attr,
694 &dev_attr_idVendor.attr,
695 &dev_attr_idProduct.attr,
696 &dev_attr_bcdDevice.attr,
697 &dev_attr_bDeviceClass.attr,
698 &dev_attr_bDeviceSubClass.attr,
699 &dev_attr_bDeviceProtocol.attr,
700 &dev_attr_bNumConfigurations.attr,
701 &dev_attr_bMaxPacketSize0.attr,
702 &dev_attr_speed.attr,
703 &dev_attr_busnum.attr,
704 &dev_attr_devnum.attr,
705 &dev_attr_devpath.attr,
706 &dev_attr_version.attr,
707 &dev_attr_maxchild.attr,
708 &dev_attr_quirks.attr,
709 &dev_attr_avoid_reset_quirk.attr,
710 &dev_attr_authorized.attr,
711 &dev_attr_remove.attr,
712 &dev_attr_removable.attr,
713 &dev_attr_ltm_capable.attr,
714 NULL,
715};
716static struct attribute_group dev_attr_grp = {
717 .attrs = dev_attrs,
718};
719
720/* When modifying this list, be sure to modify dev_string_attrs_are_visible()
721 * accordingly.
722 */
723static struct attribute *dev_string_attrs[] = {
724 &dev_attr_manufacturer.attr,
725 &dev_attr_product.attr,
726 &dev_attr_serial.attr,
727 NULL
728};
729
730static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
731 struct attribute *a, int n)
732{
733 struct device *dev = container_of(kobj, struct device, kobj);
734 struct usb_device *udev = to_usb_device(dev);
735
736 if (a == &dev_attr_manufacturer.attr) {
737 if (udev->manufacturer == NULL)
738 return 0;
739 } else if (a == &dev_attr_product.attr) {
740 if (udev->product == NULL)
741 return 0;
742 } else if (a == &dev_attr_serial.attr) {
743 if (udev->serial == NULL)
744 return 0;
745 }
746 return a->mode;
747}
748
749static struct attribute_group dev_string_attr_grp = {
750 .attrs = dev_string_attrs,
751 .is_visible = dev_string_attrs_are_visible,
752};
753
754const struct attribute_group *usb_device_groups[] = {
755 &dev_attr_grp,
756 &dev_string_attr_grp,
757 NULL
758};
759
760/* Binary descriptors */
761
762static ssize_t
763read_descriptors(struct file *filp, struct kobject *kobj,
764 struct bin_attribute *attr,
765 char *buf, loff_t off, size_t count)
766{
767 struct device *dev = container_of(kobj, struct device, kobj);
768 struct usb_device *udev = to_usb_device(dev);
769 size_t nleft = count;
770 size_t srclen, n;
771 int cfgno;
772 void *src;
773
774 /* The binary attribute begins with the device descriptor.
775 * Following that are the raw descriptor entries for all the
776 * configurations (config plus subsidiary descriptors).
777 */
778 usb_lock_device(udev);
779 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
780 nleft > 0; ++cfgno) {
781 if (cfgno < 0) {
782 src = &udev->descriptor;
783 srclen = sizeof(struct usb_device_descriptor);
784 } else {
785 src = udev->rawdescriptors[cfgno];
786 srclen = __le16_to_cpu(udev->config[cfgno].desc.
787 wTotalLength);
788 }
789 if (off < srclen) {
790 n = min(nleft, srclen - (size_t) off);
791 memcpy(buf, src + off, n);
792 nleft -= n;
793 buf += n;
794 off = 0;
795 } else {
796 off -= srclen;
797 }
798 }
799 usb_unlock_device(udev);
800 return count - nleft;
801}
802
803static struct bin_attribute dev_bin_attr_descriptors = {
804 .attr = {.name = "descriptors", .mode = 0444},
805 .read = read_descriptors,
806 .size = 18 + 65535, /* dev descr + max-size raw descriptor */
807};
808
809int usb_create_sysfs_dev_files(struct usb_device *udev)
810{
811 struct device *dev = &udev->dev;
812 int retval;
813
814 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
815 if (retval)
816 goto error;
817
818 retval = add_persist_attributes(dev);
819 if (retval)
820 goto error;
821
822 retval = add_power_attributes(dev);
823 if (retval)
824 goto error;
825 return retval;
826error:
827 usb_remove_sysfs_dev_files(udev);
828 return retval;
829}
830
831void usb_remove_sysfs_dev_files(struct usb_device *udev)
832{
833 struct device *dev = &udev->dev;
834
835 remove_power_attributes(dev);
836 remove_persist_attributes(dev);
837 device_remove_bin_file(dev, &dev_bin_attr_descriptors);
838}
839
840/* Interface Association Descriptor fields */
841#define usb_intf_assoc_attr(field, format_string) \
842static ssize_t \
843iad_##field##_show(struct device *dev, struct device_attribute *attr, \
844 char *buf) \
845{ \
846 struct usb_interface *intf = to_usb_interface(dev); \
847 \
848 return sprintf(buf, format_string, \
849 intf->intf_assoc->field); \
850} \
851static DEVICE_ATTR_RO(iad_##field)
852
853usb_intf_assoc_attr(bFirstInterface, "%02x\n");
854usb_intf_assoc_attr(bInterfaceCount, "%02d\n");
855usb_intf_assoc_attr(bFunctionClass, "%02x\n");
856usb_intf_assoc_attr(bFunctionSubClass, "%02x\n");
857usb_intf_assoc_attr(bFunctionProtocol, "%02x\n");
858
859/* Interface fields */
860#define usb_intf_attr(field, format_string) \
861static ssize_t \
862field##_show(struct device *dev, struct device_attribute *attr, \
863 char *buf) \
864{ \
865 struct usb_interface *intf = to_usb_interface(dev); \
866 \
867 return sprintf(buf, format_string, \
868 intf->cur_altsetting->desc.field); \
869} \
870static DEVICE_ATTR_RO(field)
871
872usb_intf_attr(bInterfaceNumber, "%02x\n");
873usb_intf_attr(bAlternateSetting, "%2d\n");
874usb_intf_attr(bNumEndpoints, "%02x\n");
875usb_intf_attr(bInterfaceClass, "%02x\n");
876usb_intf_attr(bInterfaceSubClass, "%02x\n");
877usb_intf_attr(bInterfaceProtocol, "%02x\n");
878
879static ssize_t interface_show(struct device *dev, struct device_attribute *attr,
880 char *buf)
881{
882 struct usb_interface *intf;
883 char *string;
884
885 intf = to_usb_interface(dev);
886 string = ACCESS_ONCE(intf->cur_altsetting->string);
887 if (!string)
888 return 0;
889 return sprintf(buf, "%s\n", string);
890}
891static DEVICE_ATTR_RO(interface);
892
893static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
894 char *buf)
895{
896 struct usb_interface *intf;
897 struct usb_device *udev;
898 struct usb_host_interface *alt;
899
900 intf = to_usb_interface(dev);
901 udev = interface_to_usbdev(intf);
902 alt = ACCESS_ONCE(intf->cur_altsetting);
903
904 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
905 "ic%02Xisc%02Xip%02Xin%02X\n",
906 le16_to_cpu(udev->descriptor.idVendor),
907 le16_to_cpu(udev->descriptor.idProduct),
908 le16_to_cpu(udev->descriptor.bcdDevice),
909 udev->descriptor.bDeviceClass,
910 udev->descriptor.bDeviceSubClass,
911 udev->descriptor.bDeviceProtocol,
912 alt->desc.bInterfaceClass,
913 alt->desc.bInterfaceSubClass,
914 alt->desc.bInterfaceProtocol,
915 alt->desc.bInterfaceNumber);
916}
917static DEVICE_ATTR_RO(modalias);
918
919static ssize_t supports_autosuspend_show(struct device *dev,
920 struct device_attribute *attr,
921 char *buf)
922{
923 int s;
924
925 device_lock(dev);
926 /* Devices will be autosuspended even when an interface isn't claimed */
927 s = (!dev->driver || to_usb_driver(dev->driver)->supports_autosuspend);
928 device_unlock(dev);
929
930 return sprintf(buf, "%u\n", s);
931}
932static DEVICE_ATTR_RO(supports_autosuspend);
933
934static struct attribute *intf_attrs[] = {
935 &dev_attr_bInterfaceNumber.attr,
936 &dev_attr_bAlternateSetting.attr,
937 &dev_attr_bNumEndpoints.attr,
938 &dev_attr_bInterfaceClass.attr,
939 &dev_attr_bInterfaceSubClass.attr,
940 &dev_attr_bInterfaceProtocol.attr,
941 &dev_attr_modalias.attr,
942 &dev_attr_supports_autosuspend.attr,
943 NULL,
944};
945static struct attribute_group intf_attr_grp = {
946 .attrs = intf_attrs,
947};
948
949static struct attribute *intf_assoc_attrs[] = {
950 &dev_attr_iad_bFirstInterface.attr,
951 &dev_attr_iad_bInterfaceCount.attr,
952 &dev_attr_iad_bFunctionClass.attr,
953 &dev_attr_iad_bFunctionSubClass.attr,
954 &dev_attr_iad_bFunctionProtocol.attr,
955 NULL,
956};
957
958static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
959 struct attribute *a, int n)
960{
961 struct device *dev = container_of(kobj, struct device, kobj);
962 struct usb_interface *intf = to_usb_interface(dev);
963
964 if (intf->intf_assoc == NULL)
965 return 0;
966 return a->mode;
967}
968
969static struct attribute_group intf_assoc_attr_grp = {
970 .attrs = intf_assoc_attrs,
971 .is_visible = intf_assoc_attrs_are_visible,
972};
973
974const struct attribute_group *usb_interface_groups[] = {
975 &intf_attr_grp,
976 &intf_assoc_attr_grp,
977 NULL
978};
979
980void usb_create_sysfs_intf_files(struct usb_interface *intf)
981{
982 struct usb_device *udev = interface_to_usbdev(intf);
983 struct usb_host_interface *alt = intf->cur_altsetting;
984
985 if (intf->sysfs_files_created || intf->unregistering)
986 return;
987
988 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
989 alt->string = usb_cache_string(udev, alt->desc.iInterface);
990 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface))
991 ; /* We don't actually care if the function fails. */
992 intf->sysfs_files_created = 1;
993}
994
995void usb_remove_sysfs_intf_files(struct usb_interface *intf)
996{
997 if (!intf->sysfs_files_created)
998 return;
999
1000 device_remove_file(&intf->dev, &dev_attr_interface);
1001 intf->sysfs_files_created = 0;
1002}