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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, multiplier, format_string) \
21static ssize_t show_##field(struct device *dev, \
22 struct device_attribute *attr, char *buf) \
23{ \
24 struct usb_device *udev; \
25 struct usb_host_config *actconfig; \
26 \
27 udev = to_usb_device(dev); \
28 actconfig = udev->actconfig; \
29 if (actconfig) \
30 return sprintf(buf, format_string, \
31 actconfig->desc.field * multiplier); \
32 else \
33 return 0; \
34} \
35
36#define usb_actconfig_attr(field, multiplier, format_string) \
37usb_actconfig_show(field, multiplier, format_string) \
38static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
39
40usb_actconfig_attr(bNumInterfaces, 1, "%2d\n")
41usb_actconfig_attr(bmAttributes, 1, "%2x\n")
42usb_actconfig_attr(bMaxPower, 2, "%3dmA\n")
43
44static ssize_t show_configuration_string(struct device *dev,
45 struct device_attribute *attr, char *buf)
46{
47 struct usb_device *udev;
48 struct usb_host_config *actconfig;
49
50 udev = to_usb_device(dev);
51 actconfig = udev->actconfig;
52 if ((!actconfig) || (!actconfig->string))
53 return 0;
54 return sprintf(buf, "%s\n", actconfig->string);
55}
56static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL);
57
58/* configuration value is always present, and r/w */
59usb_actconfig_show(bConfigurationValue, 1, "%u\n");
60
61static ssize_t
62set_bConfigurationValue(struct device *dev, struct device_attribute *attr,
63 const char *buf, size_t count)
64{
65 struct usb_device *udev = to_usb_device(dev);
66 int config, value;
67
68 if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
69 return -EINVAL;
70 usb_lock_device(udev);
71 value = usb_set_configuration(udev, config);
72 usb_unlock_device(udev);
73 return (value < 0) ? value : count;
74}
75
76static DEVICE_ATTR(bConfigurationValue, S_IRUGO | S_IWUSR,
77 show_bConfigurationValue, set_bConfigurationValue);
78
79/* String fields */
80#define usb_string_attr(name) \
81static ssize_t show_##name(struct device *dev, \
82 struct device_attribute *attr, char *buf) \
83{ \
84 struct usb_device *udev; \
85 int retval; \
86 \
87 udev = to_usb_device(dev); \
88 usb_lock_device(udev); \
89 retval = sprintf(buf, "%s\n", udev->name); \
90 usb_unlock_device(udev); \
91 return retval; \
92} \
93static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
94
95usb_string_attr(product);
96usb_string_attr(manufacturer);
97usb_string_attr(serial);
98
99static ssize_t
100show_speed(struct device *dev, struct device_attribute *attr, char *buf)
101{
102 struct usb_device *udev;
103 char *speed;
104
105 udev = to_usb_device(dev);
106
107 switch (udev->speed) {
108 case USB_SPEED_LOW:
109 speed = "1.5";
110 break;
111 case USB_SPEED_UNKNOWN:
112 case USB_SPEED_FULL:
113 speed = "12";
114 break;
115 case USB_SPEED_HIGH:
116 speed = "480";
117 break;
118 case USB_SPEED_WIRELESS:
119 speed = "480";
120 break;
121 case USB_SPEED_SUPER:
122 speed = "5000";
123 break;
124 default:
125 speed = "unknown";
126 }
127 return sprintf(buf, "%s\n", speed);
128}
129static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL);
130
131static ssize_t
132show_busnum(struct device *dev, struct device_attribute *attr, char *buf)
133{
134 struct usb_device *udev;
135
136 udev = to_usb_device(dev);
137 return sprintf(buf, "%d\n", udev->bus->busnum);
138}
139static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL);
140
141static ssize_t
142show_devnum(struct device *dev, struct device_attribute *attr, char *buf)
143{
144 struct usb_device *udev;
145
146 udev = to_usb_device(dev);
147 return sprintf(buf, "%d\n", udev->devnum);
148}
149static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL);
150
151static ssize_t
152show_devpath(struct device *dev, struct device_attribute *attr, char *buf)
153{
154 struct usb_device *udev;
155
156 udev = to_usb_device(dev);
157 return sprintf(buf, "%s\n", udev->devpath);
158}
159static DEVICE_ATTR(devpath, S_IRUGO, show_devpath, NULL);
160
161static ssize_t
162show_version(struct device *dev, struct device_attribute *attr, char *buf)
163{
164 struct usb_device *udev;
165 u16 bcdUSB;
166
167 udev = to_usb_device(dev);
168 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
169 return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
170}
171static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
172
173static ssize_t
174show_maxchild(struct device *dev, struct device_attribute *attr, char *buf)
175{
176 struct usb_device *udev;
177
178 udev = to_usb_device(dev);
179 return sprintf(buf, "%d\n", udev->maxchild);
180}
181static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL);
182
183static ssize_t
184show_quirks(struct device *dev, struct device_attribute *attr, char *buf)
185{
186 struct usb_device *udev;
187
188 udev = to_usb_device(dev);
189 return sprintf(buf, "0x%x\n", udev->quirks);
190}
191static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);
192
193static ssize_t
194show_avoid_reset_quirk(struct device *dev, struct device_attribute *attr, char *buf)
195{
196 struct usb_device *udev;
197
198 udev = to_usb_device(dev);
199 return sprintf(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET_MORPHS));
200}
201
202static ssize_t
203set_avoid_reset_quirk(struct device *dev, struct device_attribute *attr,
204 const char *buf, size_t count)
205{
206 struct usb_device *udev = to_usb_device(dev);
207 int config;
208
209 if (sscanf(buf, "%d", &config) != 1 || config < 0 || config > 1)
210 return -EINVAL;
211 usb_lock_device(udev);
212 if (config)
213 udev->quirks |= USB_QUIRK_RESET_MORPHS;
214 else
215 udev->quirks &= ~USB_QUIRK_RESET_MORPHS;
216 usb_unlock_device(udev);
217 return count;
218}
219
220static DEVICE_ATTR(avoid_reset_quirk, S_IRUGO | S_IWUSR,
221 show_avoid_reset_quirk, set_avoid_reset_quirk);
222
223static ssize_t
224show_urbnum(struct device *dev, struct device_attribute *attr, char *buf)
225{
226 struct usb_device *udev;
227
228 udev = to_usb_device(dev);
229 return sprintf(buf, "%d\n", atomic_read(&udev->urbnum));
230}
231static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL);
232
233
234#ifdef CONFIG_PM
235
236static ssize_t
237show_persist(struct device *dev, struct device_attribute *attr, char *buf)
238{
239 struct usb_device *udev = to_usb_device(dev);
240
241 return sprintf(buf, "%d\n", udev->persist_enabled);
242}
243
244static ssize_t
245set_persist(struct device *dev, struct device_attribute *attr,
246 const char *buf, size_t count)
247{
248 struct usb_device *udev = to_usb_device(dev);
249 int value;
250
251 /* Hubs are always enabled for USB_PERSIST */
252 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
253 return -EPERM;
254
255 if (sscanf(buf, "%d", &value) != 1)
256 return -EINVAL;
257
258 usb_lock_device(udev);
259 udev->persist_enabled = !!value;
260 usb_unlock_device(udev);
261 return count;
262}
263
264static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
265
266static int add_persist_attributes(struct device *dev)
267{
268 int rc = 0;
269
270 if (is_usb_device(dev)) {
271 struct usb_device *udev = to_usb_device(dev);
272
273 /* Hubs are automatically enabled for USB_PERSIST,
274 * no point in creating the attribute file.
275 */
276 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
277 rc = sysfs_add_file_to_group(&dev->kobj,
278 &dev_attr_persist.attr,
279 power_group_name);
280 }
281 return rc;
282}
283
284static void remove_persist_attributes(struct device *dev)
285{
286 sysfs_remove_file_from_group(&dev->kobj,
287 &dev_attr_persist.attr,
288 power_group_name);
289}
290#else
291
292#define add_persist_attributes(dev) 0
293#define remove_persist_attributes(dev) do {} while (0)
294
295#endif /* CONFIG_PM */
296
297#ifdef CONFIG_USB_SUSPEND
298
299static ssize_t
300show_connected_duration(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, "%u\n",
306 jiffies_to_msecs(jiffies - udev->connect_time));
307}
308
309static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
310
311/*
312 * If the device is resumed, the last time the device was suspended has
313 * been pre-subtracted from active_duration. We add the current time to
314 * get the duration that the device was actually active.
315 *
316 * If the device is suspended, the active_duration is up-to-date.
317 */
318static ssize_t
319show_active_duration(struct device *dev, struct device_attribute *attr,
320 char *buf)
321{
322 struct usb_device *udev = to_usb_device(dev);
323 int duration;
324
325 if (udev->state != USB_STATE_SUSPENDED)
326 duration = jiffies_to_msecs(jiffies + udev->active_duration);
327 else
328 duration = jiffies_to_msecs(udev->active_duration);
329 return sprintf(buf, "%u\n", duration);
330}
331
332static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
333
334static ssize_t
335show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
336{
337 return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000);
338}
339
340static ssize_t
341set_autosuspend(struct device *dev, struct device_attribute *attr,
342 const char *buf, size_t count)
343{
344 int value;
345
346 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
347 value <= -INT_MAX/1000)
348 return -EINVAL;
349
350 pm_runtime_set_autosuspend_delay(dev, value * 1000);
351 return count;
352}
353
354static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
355 show_autosuspend, set_autosuspend);
356
357static const char on_string[] = "on";
358static const char auto_string[] = "auto";
359
360static void warn_level(void) {
361 static int level_warned;
362
363 if (!level_warned) {
364 level_warned = 1;
365 printk(KERN_WARNING "WARNING! power/level is deprecated; "
366 "use power/control instead\n");
367 }
368}
369
370static ssize_t
371show_level(struct device *dev, struct device_attribute *attr, char *buf)
372{
373 struct usb_device *udev = to_usb_device(dev);
374 const char *p = auto_string;
375
376 warn_level();
377 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
378 p = on_string;
379 return sprintf(buf, "%s\n", p);
380}
381
382static ssize_t
383set_level(struct device *dev, struct device_attribute *attr,
384 const char *buf, size_t count)
385{
386 struct usb_device *udev = to_usb_device(dev);
387 int len = count;
388 char *cp;
389 int rc = count;
390
391 warn_level();
392 cp = memchr(buf, '\n', count);
393 if (cp)
394 len = cp - buf;
395
396 usb_lock_device(udev);
397
398 if (len == sizeof on_string - 1 &&
399 strncmp(buf, on_string, len) == 0)
400 usb_disable_autosuspend(udev);
401
402 else if (len == sizeof auto_string - 1 &&
403 strncmp(buf, auto_string, len) == 0)
404 usb_enable_autosuspend(udev);
405
406 else
407 rc = -EINVAL;
408
409 usb_unlock_device(udev);
410 return rc;
411}
412
413static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
414
415static struct attribute *power_attrs[] = {
416 &dev_attr_autosuspend.attr,
417 &dev_attr_level.attr,
418 &dev_attr_connected_duration.attr,
419 &dev_attr_active_duration.attr,
420 NULL,
421};
422static struct attribute_group power_attr_group = {
423 .name = power_group_name,
424 .attrs = power_attrs,
425};
426
427static int add_power_attributes(struct device *dev)
428{
429 int rc = 0;
430
431 if (is_usb_device(dev))
432 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
433 return rc;
434}
435
436static void remove_power_attributes(struct device *dev)
437{
438 sysfs_unmerge_group(&dev->kobj, &power_attr_group);
439}
440
441#else
442
443#define add_power_attributes(dev) 0
444#define remove_power_attributes(dev) do {} while (0)
445
446#endif /* CONFIG_USB_SUSPEND */
447
448
449/* Descriptor fields */
450#define usb_descriptor_attr_le16(field, format_string) \
451static ssize_t \
452show_##field(struct device *dev, struct device_attribute *attr, \
453 char *buf) \
454{ \
455 struct usb_device *udev; \
456 \
457 udev = to_usb_device(dev); \
458 return sprintf(buf, format_string, \
459 le16_to_cpu(udev->descriptor.field)); \
460} \
461static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
462
463usb_descriptor_attr_le16(idVendor, "%04x\n")
464usb_descriptor_attr_le16(idProduct, "%04x\n")
465usb_descriptor_attr_le16(bcdDevice, "%04x\n")
466
467#define usb_descriptor_attr(field, format_string) \
468static ssize_t \
469show_##field(struct device *dev, struct device_attribute *attr, \
470 char *buf) \
471{ \
472 struct usb_device *udev; \
473 \
474 udev = to_usb_device(dev); \
475 return sprintf(buf, format_string, udev->descriptor.field); \
476} \
477static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
478
479usb_descriptor_attr(bDeviceClass, "%02x\n")
480usb_descriptor_attr(bDeviceSubClass, "%02x\n")
481usb_descriptor_attr(bDeviceProtocol, "%02x\n")
482usb_descriptor_attr(bNumConfigurations, "%d\n")
483usb_descriptor_attr(bMaxPacketSize0, "%d\n")
484
485
486
487/* show if the device is authorized (1) or not (0) */
488static ssize_t usb_dev_authorized_show(struct device *dev,
489 struct device_attribute *attr,
490 char *buf)
491{
492 struct usb_device *usb_dev = to_usb_device(dev);
493 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
494}
495
496
497/*
498 * Authorize a device to be used in the system
499 *
500 * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
501 */
502static ssize_t usb_dev_authorized_store(struct device *dev,
503 struct device_attribute *attr,
504 const char *buf, size_t size)
505{
506 ssize_t result;
507 struct usb_device *usb_dev = to_usb_device(dev);
508 unsigned val;
509 result = sscanf(buf, "%u\n", &val);
510 if (result != 1)
511 result = -EINVAL;
512 else if (val == 0)
513 result = usb_deauthorize_device(usb_dev);
514 else
515 result = usb_authorize_device(usb_dev);
516 return result < 0? result : size;
517}
518
519static DEVICE_ATTR(authorized, 0644,
520 usb_dev_authorized_show, usb_dev_authorized_store);
521
522/* "Safely remove a device" */
523static ssize_t usb_remove_store(struct device *dev,
524 struct device_attribute *attr,
525 const char *buf, size_t count)
526{
527 struct usb_device *udev = to_usb_device(dev);
528 int rc = 0;
529
530 usb_lock_device(udev);
531 if (udev->state != USB_STATE_NOTATTACHED) {
532
533 /* To avoid races, first unconfigure and then remove */
534 usb_set_configuration(udev, -1);
535 rc = usb_remove_device(udev);
536 }
537 if (rc == 0)
538 rc = count;
539 usb_unlock_device(udev);
540 return rc;
541}
542static DEVICE_ATTR(remove, 0200, NULL, usb_remove_store);
543
544
545static struct attribute *dev_attrs[] = {
546 /* current configuration's attributes */
547 &dev_attr_configuration.attr,
548 &dev_attr_bNumInterfaces.attr,
549 &dev_attr_bConfigurationValue.attr,
550 &dev_attr_bmAttributes.attr,
551 &dev_attr_bMaxPower.attr,
552 /* device attributes */
553 &dev_attr_urbnum.attr,
554 &dev_attr_idVendor.attr,
555 &dev_attr_idProduct.attr,
556 &dev_attr_bcdDevice.attr,
557 &dev_attr_bDeviceClass.attr,
558 &dev_attr_bDeviceSubClass.attr,
559 &dev_attr_bDeviceProtocol.attr,
560 &dev_attr_bNumConfigurations.attr,
561 &dev_attr_bMaxPacketSize0.attr,
562 &dev_attr_speed.attr,
563 &dev_attr_busnum.attr,
564 &dev_attr_devnum.attr,
565 &dev_attr_devpath.attr,
566 &dev_attr_version.attr,
567 &dev_attr_maxchild.attr,
568 &dev_attr_quirks.attr,
569 &dev_attr_avoid_reset_quirk.attr,
570 &dev_attr_authorized.attr,
571 &dev_attr_remove.attr,
572 NULL,
573};
574static struct attribute_group dev_attr_grp = {
575 .attrs = dev_attrs,
576};
577
578/* When modifying this list, be sure to modify dev_string_attrs_are_visible()
579 * accordingly.
580 */
581static struct attribute *dev_string_attrs[] = {
582 &dev_attr_manufacturer.attr,
583 &dev_attr_product.attr,
584 &dev_attr_serial.attr,
585 NULL
586};
587
588static mode_t dev_string_attrs_are_visible(struct kobject *kobj,
589 struct attribute *a, int n)
590{
591 struct device *dev = container_of(kobj, struct device, kobj);
592 struct usb_device *udev = to_usb_device(dev);
593
594 if (a == &dev_attr_manufacturer.attr) {
595 if (udev->manufacturer == NULL)
596 return 0;
597 } else if (a == &dev_attr_product.attr) {
598 if (udev->product == NULL)
599 return 0;
600 } else if (a == &dev_attr_serial.attr) {
601 if (udev->serial == NULL)
602 return 0;
603 }
604 return a->mode;
605}
606
607static struct attribute_group dev_string_attr_grp = {
608 .attrs = dev_string_attrs,
609 .is_visible = dev_string_attrs_are_visible,
610};
611
612const struct attribute_group *usb_device_groups[] = {
613 &dev_attr_grp,
614 &dev_string_attr_grp,
615 NULL
616};
617
618/* Binary descriptors */
619
620static ssize_t
621read_descriptors(struct file *filp, struct kobject *kobj,
622 struct bin_attribute *attr,
623 char *buf, loff_t off, size_t count)
624{
625 struct device *dev = container_of(kobj, struct device, kobj);
626 struct usb_device *udev = to_usb_device(dev);
627 size_t nleft = count;
628 size_t srclen, n;
629 int cfgno;
630 void *src;
631
632 /* The binary attribute begins with the device descriptor.
633 * Following that are the raw descriptor entries for all the
634 * configurations (config plus subsidiary descriptors).
635 */
636 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
637 nleft > 0; ++cfgno) {
638 if (cfgno < 0) {
639 src = &udev->descriptor;
640 srclen = sizeof(struct usb_device_descriptor);
641 } else {
642 src = udev->rawdescriptors[cfgno];
643 srclen = __le16_to_cpu(udev->config[cfgno].desc.
644 wTotalLength);
645 }
646 if (off < srclen) {
647 n = min(nleft, srclen - (size_t) off);
648 memcpy(buf, src + off, n);
649 nleft -= n;
650 buf += n;
651 off = 0;
652 } else {
653 off -= srclen;
654 }
655 }
656 return count - nleft;
657}
658
659static struct bin_attribute dev_bin_attr_descriptors = {
660 .attr = {.name = "descriptors", .mode = 0444},
661 .read = read_descriptors,
662 .size = 18 + 65535, /* dev descr + max-size raw descriptor */
663};
664
665int usb_create_sysfs_dev_files(struct usb_device *udev)
666{
667 struct device *dev = &udev->dev;
668 int retval;
669
670 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
671 if (retval)
672 goto error;
673
674 retval = add_persist_attributes(dev);
675 if (retval)
676 goto error;
677
678 retval = add_power_attributes(dev);
679 if (retval)
680 goto error;
681 return retval;
682error:
683 usb_remove_sysfs_dev_files(udev);
684 return retval;
685}
686
687void usb_remove_sysfs_dev_files(struct usb_device *udev)
688{
689 struct device *dev = &udev->dev;
690
691 remove_power_attributes(dev);
692 remove_persist_attributes(dev);
693 device_remove_bin_file(dev, &dev_bin_attr_descriptors);
694}
695
696/* Interface Accociation Descriptor fields */
697#define usb_intf_assoc_attr(field, format_string) \
698static ssize_t \
699show_iad_##field(struct device *dev, struct device_attribute *attr, \
700 char *buf) \
701{ \
702 struct usb_interface *intf = to_usb_interface(dev); \
703 \
704 return sprintf(buf, format_string, \
705 intf->intf_assoc->field); \
706} \
707static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
708
709usb_intf_assoc_attr(bFirstInterface, "%02x\n")
710usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
711usb_intf_assoc_attr(bFunctionClass, "%02x\n")
712usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
713usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
714
715/* Interface fields */
716#define usb_intf_attr(field, format_string) \
717static ssize_t \
718show_##field(struct device *dev, struct device_attribute *attr, \
719 char *buf) \
720{ \
721 struct usb_interface *intf = to_usb_interface(dev); \
722 \
723 return sprintf(buf, format_string, \
724 intf->cur_altsetting->desc.field); \
725} \
726static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
727
728usb_intf_attr(bInterfaceNumber, "%02x\n")
729usb_intf_attr(bAlternateSetting, "%2d\n")
730usb_intf_attr(bNumEndpoints, "%02x\n")
731usb_intf_attr(bInterfaceClass, "%02x\n")
732usb_intf_attr(bInterfaceSubClass, "%02x\n")
733usb_intf_attr(bInterfaceProtocol, "%02x\n")
734
735static ssize_t show_interface_string(struct device *dev,
736 struct device_attribute *attr, char *buf)
737{
738 struct usb_interface *intf;
739 char *string;
740
741 intf = to_usb_interface(dev);
742 string = intf->cur_altsetting->string;
743 barrier(); /* The altsetting might change! */
744
745 if (!string)
746 return 0;
747 return sprintf(buf, "%s\n", string);
748}
749static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
750
751static ssize_t show_modalias(struct device *dev,
752 struct device_attribute *attr, char *buf)
753{
754 struct usb_interface *intf;
755 struct usb_device *udev;
756 struct usb_host_interface *alt;
757
758 intf = to_usb_interface(dev);
759 udev = interface_to_usbdev(intf);
760 alt = intf->cur_altsetting;
761
762 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
763 "ic%02Xisc%02Xip%02X\n",
764 le16_to_cpu(udev->descriptor.idVendor),
765 le16_to_cpu(udev->descriptor.idProduct),
766 le16_to_cpu(udev->descriptor.bcdDevice),
767 udev->descriptor.bDeviceClass,
768 udev->descriptor.bDeviceSubClass,
769 udev->descriptor.bDeviceProtocol,
770 alt->desc.bInterfaceClass,
771 alt->desc.bInterfaceSubClass,
772 alt->desc.bInterfaceProtocol);
773}
774static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
775
776static ssize_t show_supports_autosuspend(struct device *dev,
777 struct device_attribute *attr, char *buf)
778{
779 struct usb_interface *intf;
780 struct usb_device *udev;
781 int ret;
782
783 intf = to_usb_interface(dev);
784 udev = interface_to_usbdev(intf);
785
786 usb_lock_device(udev);
787 /* Devices will be autosuspended even when an interface isn't claimed */
788 if (!intf->dev.driver ||
789 to_usb_driver(intf->dev.driver)->supports_autosuspend)
790 ret = sprintf(buf, "%u\n", 1);
791 else
792 ret = sprintf(buf, "%u\n", 0);
793 usb_unlock_device(udev);
794
795 return ret;
796}
797static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
798
799static struct attribute *intf_attrs[] = {
800 &dev_attr_bInterfaceNumber.attr,
801 &dev_attr_bAlternateSetting.attr,
802 &dev_attr_bNumEndpoints.attr,
803 &dev_attr_bInterfaceClass.attr,
804 &dev_attr_bInterfaceSubClass.attr,
805 &dev_attr_bInterfaceProtocol.attr,
806 &dev_attr_modalias.attr,
807 &dev_attr_supports_autosuspend.attr,
808 NULL,
809};
810static struct attribute_group intf_attr_grp = {
811 .attrs = intf_attrs,
812};
813
814static struct attribute *intf_assoc_attrs[] = {
815 &dev_attr_iad_bFirstInterface.attr,
816 &dev_attr_iad_bInterfaceCount.attr,
817 &dev_attr_iad_bFunctionClass.attr,
818 &dev_attr_iad_bFunctionSubClass.attr,
819 &dev_attr_iad_bFunctionProtocol.attr,
820 NULL,
821};
822
823static mode_t intf_assoc_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_interface *intf = to_usb_interface(dev);
828
829 if (intf->intf_assoc == NULL)
830 return 0;
831 return a->mode;
832}
833
834static struct attribute_group intf_assoc_attr_grp = {
835 .attrs = intf_assoc_attrs,
836 .is_visible = intf_assoc_attrs_are_visible,
837};
838
839const struct attribute_group *usb_interface_groups[] = {
840 &intf_attr_grp,
841 &intf_assoc_attr_grp,
842 NULL
843};
844
845void usb_create_sysfs_intf_files(struct usb_interface *intf)
846{
847 struct usb_device *udev = interface_to_usbdev(intf);
848 struct usb_host_interface *alt = intf->cur_altsetting;
849
850 if (intf->sysfs_files_created || intf->unregistering)
851 return;
852
853 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
854 alt->string = usb_cache_string(udev, alt->desc.iInterface);
855 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface))
856 ; /* We don't actually care if the function fails. */
857 intf->sysfs_files_created = 1;
858}
859
860void usb_remove_sysfs_intf_files(struct usb_interface *intf)
861{
862 if (!intf->sysfs_files_created)
863 return;
864
865 device_remove_file(&intf->dev, &dev_attr_interface);
866 intf->sysfs_files_created = 0;
867}
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}