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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, 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_IGNORE_LOCKDEP(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
233static ssize_t
234show_removable(struct device *dev, struct device_attribute *attr, char *buf)
235{
236 struct usb_device *udev;
237 char *state;
238
239 udev = to_usb_device(dev);
240
241 switch (udev->removable) {
242 case USB_DEVICE_REMOVABLE:
243 state = "removable";
244 break;
245 case USB_DEVICE_FIXED:
246 state = "fixed";
247 break;
248 default:
249 state = "unknown";
250 }
251
252 return sprintf(buf, "%s\n", state);
253}
254static DEVICE_ATTR(removable, S_IRUGO, show_removable, NULL);
255
256#ifdef CONFIG_PM
257
258static ssize_t
259show_persist(struct device *dev, struct device_attribute *attr, char *buf)
260{
261 struct usb_device *udev = to_usb_device(dev);
262
263 return sprintf(buf, "%d\n", udev->persist_enabled);
264}
265
266static ssize_t
267set_persist(struct device *dev, struct device_attribute *attr,
268 const char *buf, size_t count)
269{
270 struct usb_device *udev = to_usb_device(dev);
271 int value;
272
273 /* Hubs are always enabled for USB_PERSIST */
274 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
275 return -EPERM;
276
277 if (sscanf(buf, "%d", &value) != 1)
278 return -EINVAL;
279
280 usb_lock_device(udev);
281 udev->persist_enabled = !!value;
282 usb_unlock_device(udev);
283 return count;
284}
285
286static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
287
288static int add_persist_attributes(struct device *dev)
289{
290 int rc = 0;
291
292 if (is_usb_device(dev)) {
293 struct usb_device *udev = to_usb_device(dev);
294
295 /* Hubs are automatically enabled for USB_PERSIST,
296 * no point in creating the attribute file.
297 */
298 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
299 rc = sysfs_add_file_to_group(&dev->kobj,
300 &dev_attr_persist.attr,
301 power_group_name);
302 }
303 return rc;
304}
305
306static void remove_persist_attributes(struct device *dev)
307{
308 sysfs_remove_file_from_group(&dev->kobj,
309 &dev_attr_persist.attr,
310 power_group_name);
311}
312#else
313
314#define add_persist_attributes(dev) 0
315#define remove_persist_attributes(dev) do {} while (0)
316
317#endif /* CONFIG_PM */
318
319#ifdef CONFIG_USB_SUSPEND
320
321static ssize_t
322show_connected_duration(struct device *dev, struct device_attribute *attr,
323 char *buf)
324{
325 struct usb_device *udev = to_usb_device(dev);
326
327 return sprintf(buf, "%u\n",
328 jiffies_to_msecs(jiffies - udev->connect_time));
329}
330
331static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
332
333/*
334 * If the device is resumed, the last time the device was suspended has
335 * been pre-subtracted from active_duration. We add the current time to
336 * get the duration that the device was actually active.
337 *
338 * If the device is suspended, the active_duration is up-to-date.
339 */
340static ssize_t
341show_active_duration(struct device *dev, struct device_attribute *attr,
342 char *buf)
343{
344 struct usb_device *udev = to_usb_device(dev);
345 int duration;
346
347 if (udev->state != USB_STATE_SUSPENDED)
348 duration = jiffies_to_msecs(jiffies + udev->active_duration);
349 else
350 duration = jiffies_to_msecs(udev->active_duration);
351 return sprintf(buf, "%u\n", duration);
352}
353
354static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
355
356static ssize_t
357show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
358{
359 return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000);
360}
361
362static ssize_t
363set_autosuspend(struct device *dev, struct device_attribute *attr,
364 const char *buf, size_t count)
365{
366 int value;
367
368 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
369 value <= -INT_MAX/1000)
370 return -EINVAL;
371
372 pm_runtime_set_autosuspend_delay(dev, value * 1000);
373 return count;
374}
375
376static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
377 show_autosuspend, set_autosuspend);
378
379static const char on_string[] = "on";
380static const char auto_string[] = "auto";
381
382static void warn_level(void) {
383 static int level_warned;
384
385 if (!level_warned) {
386 level_warned = 1;
387 printk(KERN_WARNING "WARNING! power/level is deprecated; "
388 "use power/control instead\n");
389 }
390}
391
392static ssize_t
393show_level(struct device *dev, struct device_attribute *attr, char *buf)
394{
395 struct usb_device *udev = to_usb_device(dev);
396 const char *p = auto_string;
397
398 warn_level();
399 if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
400 p = on_string;
401 return sprintf(buf, "%s\n", p);
402}
403
404static ssize_t
405set_level(struct device *dev, struct device_attribute *attr,
406 const char *buf, size_t count)
407{
408 struct usb_device *udev = to_usb_device(dev);
409 int len = count;
410 char *cp;
411 int rc = count;
412
413 warn_level();
414 cp = memchr(buf, '\n', count);
415 if (cp)
416 len = cp - buf;
417
418 usb_lock_device(udev);
419
420 if (len == sizeof on_string - 1 &&
421 strncmp(buf, on_string, len) == 0)
422 usb_disable_autosuspend(udev);
423
424 else if (len == sizeof auto_string - 1 &&
425 strncmp(buf, auto_string, len) == 0)
426 usb_enable_autosuspend(udev);
427
428 else
429 rc = -EINVAL;
430
431 usb_unlock_device(udev);
432 return rc;
433}
434
435static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
436
437static ssize_t
438show_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr,
439 char *buf)
440{
441 struct usb_device *udev = to_usb_device(dev);
442 const char *p;
443
444 if (udev->usb2_hw_lpm_enabled == 1)
445 p = "enabled";
446 else
447 p = "disabled";
448
449 return sprintf(buf, "%s\n", p);
450}
451
452static ssize_t
453set_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr,
454 const char *buf, size_t count)
455{
456 struct usb_device *udev = to_usb_device(dev);
457 bool value;
458 int ret;
459
460 usb_lock_device(udev);
461
462 ret = strtobool(buf, &value);
463
464 if (!ret)
465 ret = usb_set_usb2_hardware_lpm(udev, value);
466
467 usb_unlock_device(udev);
468
469 if (!ret)
470 return count;
471
472 return ret;
473}
474
475static DEVICE_ATTR(usb2_hardware_lpm, S_IRUGO | S_IWUSR, show_usb2_hardware_lpm,
476 set_usb2_hardware_lpm);
477
478static struct attribute *usb2_hardware_lpm_attr[] = {
479 &dev_attr_usb2_hardware_lpm.attr,
480 NULL,
481};
482static struct attribute_group usb2_hardware_lpm_attr_group = {
483 .name = power_group_name,
484 .attrs = usb2_hardware_lpm_attr,
485};
486
487static struct attribute *power_attrs[] = {
488 &dev_attr_autosuspend.attr,
489 &dev_attr_level.attr,
490 &dev_attr_connected_duration.attr,
491 &dev_attr_active_duration.attr,
492 NULL,
493};
494static struct attribute_group power_attr_group = {
495 .name = power_group_name,
496 .attrs = power_attrs,
497};
498
499static int add_power_attributes(struct device *dev)
500{
501 int rc = 0;
502
503 if (is_usb_device(dev)) {
504 struct usb_device *udev = to_usb_device(dev);
505 rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
506 if (udev->usb2_hw_lpm_capable == 1)
507 rc = sysfs_merge_group(&dev->kobj,
508 &usb2_hardware_lpm_attr_group);
509 }
510
511 return rc;
512}
513
514static void remove_power_attributes(struct device *dev)
515{
516 sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
517 sysfs_unmerge_group(&dev->kobj, &power_attr_group);
518}
519
520#else
521
522#define add_power_attributes(dev) 0
523#define remove_power_attributes(dev) do {} while (0)
524
525#endif /* CONFIG_USB_SUSPEND */
526
527
528/* Descriptor fields */
529#define usb_descriptor_attr_le16(field, format_string) \
530static ssize_t \
531show_##field(struct device *dev, struct device_attribute *attr, \
532 char *buf) \
533{ \
534 struct usb_device *udev; \
535 \
536 udev = to_usb_device(dev); \
537 return sprintf(buf, format_string, \
538 le16_to_cpu(udev->descriptor.field)); \
539} \
540static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
541
542usb_descriptor_attr_le16(idVendor, "%04x\n")
543usb_descriptor_attr_le16(idProduct, "%04x\n")
544usb_descriptor_attr_le16(bcdDevice, "%04x\n")
545
546#define usb_descriptor_attr(field, format_string) \
547static ssize_t \
548show_##field(struct device *dev, struct device_attribute *attr, \
549 char *buf) \
550{ \
551 struct usb_device *udev; \
552 \
553 udev = to_usb_device(dev); \
554 return sprintf(buf, format_string, udev->descriptor.field); \
555} \
556static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
557
558usb_descriptor_attr(bDeviceClass, "%02x\n")
559usb_descriptor_attr(bDeviceSubClass, "%02x\n")
560usb_descriptor_attr(bDeviceProtocol, "%02x\n")
561usb_descriptor_attr(bNumConfigurations, "%d\n")
562usb_descriptor_attr(bMaxPacketSize0, "%d\n")
563
564
565
566/* show if the device is authorized (1) or not (0) */
567static ssize_t usb_dev_authorized_show(struct device *dev,
568 struct device_attribute *attr,
569 char *buf)
570{
571 struct usb_device *usb_dev = to_usb_device(dev);
572 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
573}
574
575
576/*
577 * Authorize a device to be used in the system
578 *
579 * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
580 */
581static ssize_t usb_dev_authorized_store(struct device *dev,
582 struct device_attribute *attr,
583 const char *buf, size_t size)
584{
585 ssize_t result;
586 struct usb_device *usb_dev = to_usb_device(dev);
587 unsigned val;
588 result = sscanf(buf, "%u\n", &val);
589 if (result != 1)
590 result = -EINVAL;
591 else if (val == 0)
592 result = usb_deauthorize_device(usb_dev);
593 else
594 result = usb_authorize_device(usb_dev);
595 return result < 0? result : size;
596}
597
598static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, 0644,
599 usb_dev_authorized_show, usb_dev_authorized_store);
600
601/* "Safely remove a device" */
602static ssize_t usb_remove_store(struct device *dev,
603 struct device_attribute *attr,
604 const char *buf, size_t count)
605{
606 struct usb_device *udev = to_usb_device(dev);
607 int rc = 0;
608
609 usb_lock_device(udev);
610 if (udev->state != USB_STATE_NOTATTACHED) {
611
612 /* To avoid races, first unconfigure and then remove */
613 usb_set_configuration(udev, -1);
614 rc = usb_remove_device(udev);
615 }
616 if (rc == 0)
617 rc = count;
618 usb_unlock_device(udev);
619 return rc;
620}
621static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0200, NULL, usb_remove_store);
622
623
624static struct attribute *dev_attrs[] = {
625 /* current configuration's attributes */
626 &dev_attr_configuration.attr,
627 &dev_attr_bNumInterfaces.attr,
628 &dev_attr_bConfigurationValue.attr,
629 &dev_attr_bmAttributes.attr,
630 &dev_attr_bMaxPower.attr,
631 /* device attributes */
632 &dev_attr_urbnum.attr,
633 &dev_attr_idVendor.attr,
634 &dev_attr_idProduct.attr,
635 &dev_attr_bcdDevice.attr,
636 &dev_attr_bDeviceClass.attr,
637 &dev_attr_bDeviceSubClass.attr,
638 &dev_attr_bDeviceProtocol.attr,
639 &dev_attr_bNumConfigurations.attr,
640 &dev_attr_bMaxPacketSize0.attr,
641 &dev_attr_speed.attr,
642 &dev_attr_busnum.attr,
643 &dev_attr_devnum.attr,
644 &dev_attr_devpath.attr,
645 &dev_attr_version.attr,
646 &dev_attr_maxchild.attr,
647 &dev_attr_quirks.attr,
648 &dev_attr_avoid_reset_quirk.attr,
649 &dev_attr_authorized.attr,
650 &dev_attr_remove.attr,
651 &dev_attr_removable.attr,
652 NULL,
653};
654static struct attribute_group dev_attr_grp = {
655 .attrs = dev_attrs,
656};
657
658/* When modifying this list, be sure to modify dev_string_attrs_are_visible()
659 * accordingly.
660 */
661static struct attribute *dev_string_attrs[] = {
662 &dev_attr_manufacturer.attr,
663 &dev_attr_product.attr,
664 &dev_attr_serial.attr,
665 NULL
666};
667
668static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
669 struct attribute *a, int n)
670{
671 struct device *dev = container_of(kobj, struct device, kobj);
672 struct usb_device *udev = to_usb_device(dev);
673
674 if (a == &dev_attr_manufacturer.attr) {
675 if (udev->manufacturer == NULL)
676 return 0;
677 } else if (a == &dev_attr_product.attr) {
678 if (udev->product == NULL)
679 return 0;
680 } else if (a == &dev_attr_serial.attr) {
681 if (udev->serial == NULL)
682 return 0;
683 }
684 return a->mode;
685}
686
687static struct attribute_group dev_string_attr_grp = {
688 .attrs = dev_string_attrs,
689 .is_visible = dev_string_attrs_are_visible,
690};
691
692const struct attribute_group *usb_device_groups[] = {
693 &dev_attr_grp,
694 &dev_string_attr_grp,
695 NULL
696};
697
698/* Binary descriptors */
699
700static ssize_t
701read_descriptors(struct file *filp, struct kobject *kobj,
702 struct bin_attribute *attr,
703 char *buf, loff_t off, size_t count)
704{
705 struct device *dev = container_of(kobj, struct device, kobj);
706 struct usb_device *udev = to_usb_device(dev);
707 size_t nleft = count;
708 size_t srclen, n;
709 int cfgno;
710 void *src;
711
712 /* The binary attribute begins with the device descriptor.
713 * Following that are the raw descriptor entries for all the
714 * configurations (config plus subsidiary descriptors).
715 */
716 for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
717 nleft > 0; ++cfgno) {
718 if (cfgno < 0) {
719 src = &udev->descriptor;
720 srclen = sizeof(struct usb_device_descriptor);
721 } else {
722 src = udev->rawdescriptors[cfgno];
723 srclen = __le16_to_cpu(udev->config[cfgno].desc.
724 wTotalLength);
725 }
726 if (off < srclen) {
727 n = min(nleft, srclen - (size_t) off);
728 memcpy(buf, src + off, n);
729 nleft -= n;
730 buf += n;
731 off = 0;
732 } else {
733 off -= srclen;
734 }
735 }
736 return count - nleft;
737}
738
739static struct bin_attribute dev_bin_attr_descriptors = {
740 .attr = {.name = "descriptors", .mode = 0444},
741 .read = read_descriptors,
742 .size = 18 + 65535, /* dev descr + max-size raw descriptor */
743};
744
745int usb_create_sysfs_dev_files(struct usb_device *udev)
746{
747 struct device *dev = &udev->dev;
748 int retval;
749
750 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
751 if (retval)
752 goto error;
753
754 retval = add_persist_attributes(dev);
755 if (retval)
756 goto error;
757
758 retval = add_power_attributes(dev);
759 if (retval)
760 goto error;
761 return retval;
762error:
763 usb_remove_sysfs_dev_files(udev);
764 return retval;
765}
766
767void usb_remove_sysfs_dev_files(struct usb_device *udev)
768{
769 struct device *dev = &udev->dev;
770
771 remove_power_attributes(dev);
772 remove_persist_attributes(dev);
773 device_remove_bin_file(dev, &dev_bin_attr_descriptors);
774}
775
776/* Interface Accociation Descriptor fields */
777#define usb_intf_assoc_attr(field, format_string) \
778static ssize_t \
779show_iad_##field(struct device *dev, struct device_attribute *attr, \
780 char *buf) \
781{ \
782 struct usb_interface *intf = to_usb_interface(dev); \
783 \
784 return sprintf(buf, format_string, \
785 intf->intf_assoc->field); \
786} \
787static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
788
789usb_intf_assoc_attr(bFirstInterface, "%02x\n")
790usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
791usb_intf_assoc_attr(bFunctionClass, "%02x\n")
792usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
793usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
794
795/* Interface fields */
796#define usb_intf_attr(field, format_string) \
797static ssize_t \
798show_##field(struct device *dev, struct device_attribute *attr, \
799 char *buf) \
800{ \
801 struct usb_interface *intf = to_usb_interface(dev); \
802 \
803 return sprintf(buf, format_string, \
804 intf->cur_altsetting->desc.field); \
805} \
806static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
807
808usb_intf_attr(bInterfaceNumber, "%02x\n")
809usb_intf_attr(bAlternateSetting, "%2d\n")
810usb_intf_attr(bNumEndpoints, "%02x\n")
811usb_intf_attr(bInterfaceClass, "%02x\n")
812usb_intf_attr(bInterfaceSubClass, "%02x\n")
813usb_intf_attr(bInterfaceProtocol, "%02x\n")
814
815static ssize_t show_interface_string(struct device *dev,
816 struct device_attribute *attr, char *buf)
817{
818 struct usb_interface *intf;
819 char *string;
820
821 intf = to_usb_interface(dev);
822 string = intf->cur_altsetting->string;
823 barrier(); /* The altsetting might change! */
824
825 if (!string)
826 return 0;
827 return sprintf(buf, "%s\n", string);
828}
829static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
830
831static ssize_t show_modalias(struct device *dev,
832 struct device_attribute *attr, char *buf)
833{
834 struct usb_interface *intf;
835 struct usb_device *udev;
836 struct usb_host_interface *alt;
837
838 intf = to_usb_interface(dev);
839 udev = interface_to_usbdev(intf);
840 alt = intf->cur_altsetting;
841
842 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
843 "ic%02Xisc%02Xip%02X\n",
844 le16_to_cpu(udev->descriptor.idVendor),
845 le16_to_cpu(udev->descriptor.idProduct),
846 le16_to_cpu(udev->descriptor.bcdDevice),
847 udev->descriptor.bDeviceClass,
848 udev->descriptor.bDeviceSubClass,
849 udev->descriptor.bDeviceProtocol,
850 alt->desc.bInterfaceClass,
851 alt->desc.bInterfaceSubClass,
852 alt->desc.bInterfaceProtocol);
853}
854static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
855
856static ssize_t show_supports_autosuspend(struct device *dev,
857 struct device_attribute *attr, char *buf)
858{
859 struct usb_interface *intf;
860 struct usb_device *udev;
861 int ret;
862
863 intf = to_usb_interface(dev);
864 udev = interface_to_usbdev(intf);
865
866 usb_lock_device(udev);
867 /* Devices will be autosuspended even when an interface isn't claimed */
868 if (!intf->dev.driver ||
869 to_usb_driver(intf->dev.driver)->supports_autosuspend)
870 ret = sprintf(buf, "%u\n", 1);
871 else
872 ret = sprintf(buf, "%u\n", 0);
873 usb_unlock_device(udev);
874
875 return ret;
876}
877static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
878
879static struct attribute *intf_attrs[] = {
880 &dev_attr_bInterfaceNumber.attr,
881 &dev_attr_bAlternateSetting.attr,
882 &dev_attr_bNumEndpoints.attr,
883 &dev_attr_bInterfaceClass.attr,
884 &dev_attr_bInterfaceSubClass.attr,
885 &dev_attr_bInterfaceProtocol.attr,
886 &dev_attr_modalias.attr,
887 &dev_attr_supports_autosuspend.attr,
888 NULL,
889};
890static struct attribute_group intf_attr_grp = {
891 .attrs = intf_attrs,
892};
893
894static struct attribute *intf_assoc_attrs[] = {
895 &dev_attr_iad_bFirstInterface.attr,
896 &dev_attr_iad_bInterfaceCount.attr,
897 &dev_attr_iad_bFunctionClass.attr,
898 &dev_attr_iad_bFunctionSubClass.attr,
899 &dev_attr_iad_bFunctionProtocol.attr,
900 NULL,
901};
902
903static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
904 struct attribute *a, int n)
905{
906 struct device *dev = container_of(kobj, struct device, kobj);
907 struct usb_interface *intf = to_usb_interface(dev);
908
909 if (intf->intf_assoc == NULL)
910 return 0;
911 return a->mode;
912}
913
914static struct attribute_group intf_assoc_attr_grp = {
915 .attrs = intf_assoc_attrs,
916 .is_visible = intf_assoc_attrs_are_visible,
917};
918
919const struct attribute_group *usb_interface_groups[] = {
920 &intf_attr_grp,
921 &intf_assoc_attr_grp,
922 NULL
923};
924
925void usb_create_sysfs_intf_files(struct usb_interface *intf)
926{
927 struct usb_device *udev = interface_to_usbdev(intf);
928 struct usb_host_interface *alt = intf->cur_altsetting;
929
930 if (intf->sysfs_files_created || intf->unregistering)
931 return;
932
933 if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
934 alt->string = usb_cache_string(udev, alt->desc.iInterface);
935 if (alt->string && device_create_file(&intf->dev, &dev_attr_interface))
936 ; /* We don't actually care if the function fails. */
937 intf->sysfs_files_created = 1;
938}
939
940void usb_remove_sysfs_intf_files(struct usb_interface *intf)
941{
942 if (!intf->sysfs_files_created)
943 return;
944
945 device_remove_file(&intf->dev, &dev_attr_interface);
946 intf->sysfs_files_created = 0;
947}