Merge branch 'for-linus' of git://repo.or.cz/cris-mirror
[linux-2.6] / drivers / usb / core / sysfs.c
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)            \
21 static 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)            \
37 usb_actconfig_show(field, multiplier, format_string)                    \
38 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
39
40 usb_actconfig_attr(bNumInterfaces, 1, "%2d\n")
41 usb_actconfig_attr(bmAttributes, 1, "%2x\n")
42 usb_actconfig_attr(bMaxPower, 2, "%3dmA\n")
43
44 static 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 }
56 static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL);
57
58 /* configuration value is always present, and r/w */
59 usb_actconfig_show(bConfigurationValue, 1, "%u\n");
60
61 static ssize_t
62 set_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
76 static DEVICE_ATTR(bConfigurationValue, S_IRUGO | S_IWUSR,
77                 show_bConfigurationValue, set_bConfigurationValue);
78
79 /* String fields */
80 #define usb_string_attr(name)                                           \
81 static ssize_t  show_##name(struct device *dev,                         \
82                 struct device_attribute *attr, char *buf)               \
83 {                                                                       \
84         struct usb_device *udev;                                        \
85                                                                         \
86         udev = to_usb_device(dev);                                      \
87         return sprintf(buf, "%s\n", udev->name);                        \
88 }                                                                       \
89 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
90
91 usb_string_attr(product);
92 usb_string_attr(manufacturer);
93 usb_string_attr(serial);
94
95 static ssize_t
96 show_speed(struct device *dev, struct device_attribute *attr, char *buf)
97 {
98         struct usb_device *udev;
99         char *speed;
100
101         udev = to_usb_device(dev);
102
103         switch (udev->speed) {
104         case USB_SPEED_LOW:
105                 speed = "1.5";
106                 break;
107         case USB_SPEED_UNKNOWN:
108         case USB_SPEED_FULL:
109                 speed = "12";
110                 break;
111         case USB_SPEED_HIGH:
112                 speed = "480";
113                 break;
114         default:
115                 speed = "unknown";
116         }
117         return sprintf(buf, "%s\n", speed);
118 }
119 static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL);
120
121 static ssize_t
122 show_busnum(struct device *dev, struct device_attribute *attr, char *buf)
123 {
124         struct usb_device *udev;
125
126         udev = to_usb_device(dev);
127         return sprintf(buf, "%d\n", udev->bus->busnum);
128 }
129 static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL);
130
131 static ssize_t
132 show_devnum(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->devnum);
138 }
139 static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL);
140
141 static ssize_t
142 show_version(struct device *dev, struct device_attribute *attr, char *buf)
143 {
144         struct usb_device *udev;
145         u16 bcdUSB;
146
147         udev = to_usb_device(dev);
148         bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
149         return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
150 }
151 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
152
153 static ssize_t
154 show_maxchild(struct device *dev, struct device_attribute *attr, char *buf)
155 {
156         struct usb_device *udev;
157
158         udev = to_usb_device(dev);
159         return sprintf(buf, "%d\n", udev->maxchild);
160 }
161 static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL);
162
163 static ssize_t
164 show_quirks(struct device *dev, struct device_attribute *attr, char *buf)
165 {
166         struct usb_device *udev;
167
168         udev = to_usb_device(dev);
169         return sprintf(buf, "0x%x\n", udev->quirks);
170 }
171 static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);
172
173 static ssize_t
174 show_urbnum(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", atomic_read(&udev->urbnum));
180 }
181 static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL);
182
183
184 #ifdef  CONFIG_PM
185
186 static const char power_group[] = "power";
187
188 static ssize_t
189 show_persist(struct device *dev, struct device_attribute *attr, char *buf)
190 {
191         struct usb_device *udev = to_usb_device(dev);
192
193         return sprintf(buf, "%d\n", udev->persist_enabled);
194 }
195
196 static ssize_t
197 set_persist(struct device *dev, struct device_attribute *attr,
198                 const char *buf, size_t count)
199 {
200         struct usb_device *udev = to_usb_device(dev);
201         int value;
202
203         /* Hubs are always enabled for USB_PERSIST */
204         if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
205                 return -EPERM;
206
207         if (sscanf(buf, "%d", &value) != 1)
208                 return -EINVAL;
209         usb_pm_lock(udev);
210         udev->persist_enabled = !!value;
211         usb_pm_unlock(udev);
212         return count;
213 }
214
215 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
216
217 static int add_persist_attributes(struct device *dev)
218 {
219         int rc = 0;
220
221         if (is_usb_device(dev)) {
222                 struct usb_device *udev = to_usb_device(dev);
223
224                 /* Hubs are automatically enabled for USB_PERSIST,
225                  * no point in creating the attribute file.
226                  */
227                 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
228                         rc = sysfs_add_file_to_group(&dev->kobj,
229                                         &dev_attr_persist.attr,
230                                         power_group);
231         }
232         return rc;
233 }
234
235 static void remove_persist_attributes(struct device *dev)
236 {
237         sysfs_remove_file_from_group(&dev->kobj,
238                         &dev_attr_persist.attr,
239                         power_group);
240 }
241 #else
242
243 #define add_persist_attributes(dev)     0
244 #define remove_persist_attributes(dev)  do {} while (0)
245
246 #endif  /* CONFIG_PM */
247
248 #ifdef  CONFIG_USB_SUSPEND
249
250 static ssize_t
251 show_connected_duration(struct device *dev, struct device_attribute *attr,
252                 char *buf)
253 {
254         struct usb_device *udev = to_usb_device(dev);
255
256         return sprintf(buf, "%u\n",
257                         jiffies_to_msecs(jiffies - udev->connect_time));
258 }
259
260 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
261
262 /*
263  * If the device is resumed, the last time the device was suspended has
264  * been pre-subtracted from active_duration.  We add the current time to
265  * get the duration that the device was actually active.
266  *
267  * If the device is suspended, the active_duration is up-to-date.
268  */
269 static ssize_t
270 show_active_duration(struct device *dev, struct device_attribute *attr,
271                 char *buf)
272 {
273         struct usb_device *udev = to_usb_device(dev);
274         int duration;
275
276         if (udev->state != USB_STATE_SUSPENDED)
277                 duration = jiffies_to_msecs(jiffies + udev->active_duration);
278         else
279                 duration = jiffies_to_msecs(udev->active_duration);
280         return sprintf(buf, "%u\n", duration);
281 }
282
283 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
284
285 static ssize_t
286 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
287 {
288         struct usb_device *udev = to_usb_device(dev);
289
290         return sprintf(buf, "%d\n", udev->autosuspend_delay / HZ);
291 }
292
293 static ssize_t
294 set_autosuspend(struct device *dev, struct device_attribute *attr,
295                 const char *buf, size_t count)
296 {
297         struct usb_device *udev = to_usb_device(dev);
298         int value;
299
300         if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/HZ ||
301                         value <= - INT_MAX/HZ)
302                 return -EINVAL;
303         value *= HZ;
304
305         udev->autosuspend_delay = value;
306         if (value >= 0)
307                 usb_try_autosuspend_device(udev);
308         else {
309                 if (usb_autoresume_device(udev) == 0)
310                         usb_autosuspend_device(udev);
311         }
312         return count;
313 }
314
315 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
316                 show_autosuspend, set_autosuspend);
317
318 static const char on_string[] = "on";
319 static const char auto_string[] = "auto";
320 static const char suspend_string[] = "suspend";
321
322 static ssize_t
323 show_level(struct device *dev, struct device_attribute *attr, char *buf)
324 {
325         struct usb_device *udev = to_usb_device(dev);
326         const char *p = auto_string;
327
328         if (udev->state == USB_STATE_SUSPENDED) {
329                 if (udev->autoresume_disabled)
330                         p = suspend_string;
331         } else {
332                 if (udev->autosuspend_disabled)
333                         p = on_string;
334         }
335         return sprintf(buf, "%s\n", p);
336 }
337
338 static ssize_t
339 set_level(struct device *dev, struct device_attribute *attr,
340                 const char *buf, size_t count)
341 {
342         struct usb_device *udev = to_usb_device(dev);
343         int len = count;
344         char *cp;
345         int rc = 0;
346         int old_autosuspend_disabled, old_autoresume_disabled;
347
348         cp = memchr(buf, '\n', count);
349         if (cp)
350                 len = cp - buf;
351
352         usb_lock_device(udev);
353         old_autosuspend_disabled = udev->autosuspend_disabled;
354         old_autoresume_disabled = udev->autoresume_disabled;
355
356         /* Setting the flags without calling usb_pm_lock is a subject to
357          * races, but who cares...
358          */
359         if (len == sizeof on_string - 1 &&
360                         strncmp(buf, on_string, len) == 0) {
361                 udev->autosuspend_disabled = 1;
362                 udev->autoresume_disabled = 0;
363                 rc = usb_external_resume_device(udev, PMSG_USER_RESUME);
364
365         } else if (len == sizeof auto_string - 1 &&
366                         strncmp(buf, auto_string, len) == 0) {
367                 udev->autosuspend_disabled = 0;
368                 udev->autoresume_disabled = 0;
369                 rc = usb_external_resume_device(udev, PMSG_USER_RESUME);
370
371         } else if (len == sizeof suspend_string - 1 &&
372                         strncmp(buf, suspend_string, len) == 0) {
373                 udev->autosuspend_disabled = 0;
374                 udev->autoresume_disabled = 1;
375                 rc = usb_external_suspend_device(udev, PMSG_USER_SUSPEND);
376
377         } else
378                 rc = -EINVAL;
379
380         if (rc) {
381                 udev->autosuspend_disabled = old_autosuspend_disabled;
382                 udev->autoresume_disabled = old_autoresume_disabled;
383         }
384         usb_unlock_device(udev);
385         return (rc < 0 ? rc : count);
386 }
387
388 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
389
390 static int add_power_attributes(struct device *dev)
391 {
392         int rc = 0;
393
394         if (is_usb_device(dev)) {
395                 rc = sysfs_add_file_to_group(&dev->kobj,
396                                 &dev_attr_autosuspend.attr,
397                                 power_group);
398                 if (rc == 0)
399                         rc = sysfs_add_file_to_group(&dev->kobj,
400                                         &dev_attr_level.attr,
401                                         power_group);
402                 if (rc == 0)
403                         rc = sysfs_add_file_to_group(&dev->kobj,
404                                         &dev_attr_connected_duration.attr,
405                                         power_group);
406                 if (rc == 0)
407                         rc = sysfs_add_file_to_group(&dev->kobj,
408                                         &dev_attr_active_duration.attr,
409                                         power_group);
410         }
411         return rc;
412 }
413
414 static void remove_power_attributes(struct device *dev)
415 {
416         sysfs_remove_file_from_group(&dev->kobj,
417                         &dev_attr_active_duration.attr,
418                         power_group);
419         sysfs_remove_file_from_group(&dev->kobj,
420                         &dev_attr_connected_duration.attr,
421                         power_group);
422         sysfs_remove_file_from_group(&dev->kobj,
423                         &dev_attr_level.attr,
424                         power_group);
425         sysfs_remove_file_from_group(&dev->kobj,
426                         &dev_attr_autosuspend.attr,
427                         power_group);
428 }
429
430 #else
431
432 #define add_power_attributes(dev)       0
433 #define remove_power_attributes(dev)    do {} while (0)
434
435 #endif  /* CONFIG_USB_SUSPEND */
436
437
438 /* Descriptor fields */
439 #define usb_descriptor_attr_le16(field, format_string)                  \
440 static ssize_t                                                          \
441 show_##field(struct device *dev, struct device_attribute *attr, \
442                 char *buf)                                              \
443 {                                                                       \
444         struct usb_device *udev;                                        \
445                                                                         \
446         udev = to_usb_device(dev);                                      \
447         return sprintf(buf, format_string,                              \
448                         le16_to_cpu(udev->descriptor.field));           \
449 }                                                                       \
450 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
451
452 usb_descriptor_attr_le16(idVendor, "%04x\n")
453 usb_descriptor_attr_le16(idProduct, "%04x\n")
454 usb_descriptor_attr_le16(bcdDevice, "%04x\n")
455
456 #define usb_descriptor_attr(field, format_string)                       \
457 static ssize_t                                                          \
458 show_##field(struct device *dev, struct device_attribute *attr, \
459                 char *buf)                                              \
460 {                                                                       \
461         struct usb_device *udev;                                        \
462                                                                         \
463         udev = to_usb_device(dev);                                      \
464         return sprintf(buf, format_string, udev->descriptor.field);     \
465 }                                                                       \
466 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
467
468 usb_descriptor_attr(bDeviceClass, "%02x\n")
469 usb_descriptor_attr(bDeviceSubClass, "%02x\n")
470 usb_descriptor_attr(bDeviceProtocol, "%02x\n")
471 usb_descriptor_attr(bNumConfigurations, "%d\n")
472 usb_descriptor_attr(bMaxPacketSize0, "%d\n")
473
474
475
476 /* show if the device is authorized (1) or not (0) */
477 static ssize_t usb_dev_authorized_show(struct device *dev,
478                                        struct device_attribute *attr,
479                                        char *buf)
480 {
481         struct usb_device *usb_dev = to_usb_device(dev);
482         return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
483 }
484
485
486 /*
487  * Authorize a device to be used in the system
488  *
489  * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
490  */
491 static ssize_t usb_dev_authorized_store(struct device *dev,
492                                         struct device_attribute *attr,
493                                         const char *buf, size_t size)
494 {
495         ssize_t result;
496         struct usb_device *usb_dev = to_usb_device(dev);
497         unsigned val;
498         result = sscanf(buf, "%u\n", &val);
499         if (result != 1)
500                 result = -EINVAL;
501         else if (val == 0)
502                 result = usb_deauthorize_device(usb_dev);
503         else
504                 result = usb_authorize_device(usb_dev);
505         return result < 0? result : size;
506 }
507
508 static DEVICE_ATTR(authorized, 0644,
509             usb_dev_authorized_show, usb_dev_authorized_store);
510
511
512 static struct attribute *dev_attrs[] = {
513         /* current configuration's attributes */
514         &dev_attr_configuration.attr,
515         &dev_attr_bNumInterfaces.attr,
516         &dev_attr_bConfigurationValue.attr,
517         &dev_attr_bmAttributes.attr,
518         &dev_attr_bMaxPower.attr,
519         &dev_attr_urbnum.attr,
520         /* device attributes */
521         &dev_attr_idVendor.attr,
522         &dev_attr_idProduct.attr,
523         &dev_attr_bcdDevice.attr,
524         &dev_attr_bDeviceClass.attr,
525         &dev_attr_bDeviceSubClass.attr,
526         &dev_attr_bDeviceProtocol.attr,
527         &dev_attr_bNumConfigurations.attr,
528         &dev_attr_bMaxPacketSize0.attr,
529         &dev_attr_speed.attr,
530         &dev_attr_busnum.attr,
531         &dev_attr_devnum.attr,
532         &dev_attr_version.attr,
533         &dev_attr_maxchild.attr,
534         &dev_attr_quirks.attr,
535         &dev_attr_authorized.attr,
536         NULL,
537 };
538 static struct attribute_group dev_attr_grp = {
539         .attrs = dev_attrs,
540 };
541
542 /* When modifying this list, be sure to modify dev_string_attrs_are_visible()
543  * accordingly.
544  */
545 static struct attribute *dev_string_attrs[] = {
546         &dev_attr_manufacturer.attr,
547         &dev_attr_product.attr,
548         &dev_attr_serial.attr,
549         NULL
550 };
551
552 static mode_t dev_string_attrs_are_visible(struct kobject *kobj,
553                 struct attribute *a, int n)
554 {
555         struct usb_device *udev = to_usb_device(
556                         container_of(kobj, struct device, kobj));
557
558         if (a == &dev_attr_manufacturer.attr) {
559                 if (udev->manufacturer == NULL)
560                         return 0;
561         } else if (a == &dev_attr_product.attr) {
562                 if (udev->product == NULL)
563                         return 0;
564         } else if (a == &dev_attr_serial.attr) {
565                 if (udev->serial == NULL)
566                         return 0;
567         }
568         return a->mode;
569 }
570
571 static struct attribute_group dev_string_attr_grp = {
572         .attrs =        dev_string_attrs,
573         .is_visible =   dev_string_attrs_are_visible,
574 };
575
576 struct attribute_group *usb_device_groups[] = {
577         &dev_attr_grp,
578         &dev_string_attr_grp,
579         NULL
580 };
581
582 /* Binary descriptors */
583
584 static ssize_t
585 read_descriptors(struct kobject *kobj, struct bin_attribute *attr,
586                 char *buf, loff_t off, size_t count)
587 {
588         struct usb_device *udev = to_usb_device(
589                         container_of(kobj, struct device, kobj));
590         size_t nleft = count;
591         size_t srclen, n;
592         int cfgno;
593         void *src;
594
595         /* The binary attribute begins with the device descriptor.
596          * Following that are the raw descriptor entries for all the
597          * configurations (config plus subsidiary descriptors).
598          */
599         for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
600                         nleft > 0; ++cfgno) {
601                 if (cfgno < 0) {
602                         src = &udev->descriptor;
603                         srclen = sizeof(struct usb_device_descriptor);
604                 } else {
605                         src = udev->rawdescriptors[cfgno];
606                         srclen = __le16_to_cpu(udev->config[cfgno].desc.
607                                         wTotalLength);
608                 }
609                 if (off < srclen) {
610                         n = min(nleft, srclen - (size_t) off);
611                         memcpy(buf, src + off, n);
612                         nleft -= n;
613                         buf += n;
614                         off = 0;
615                 } else {
616                         off -= srclen;
617                 }
618         }
619         return count - nleft;
620 }
621
622 static struct bin_attribute dev_bin_attr_descriptors = {
623         .attr = {.name = "descriptors", .mode = 0444},
624         .read = read_descriptors,
625         .size = 18 + 65535,     /* dev descr + max-size raw descriptor */
626 };
627
628 int usb_create_sysfs_dev_files(struct usb_device *udev)
629 {
630         struct device *dev = &udev->dev;
631         int retval;
632
633         retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
634         if (retval)
635                 goto error;
636
637         retval = add_persist_attributes(dev);
638         if (retval)
639                 goto error;
640
641         retval = add_power_attributes(dev);
642         if (retval)
643                 goto error;
644         return retval;
645 error:
646         usb_remove_sysfs_dev_files(udev);
647         return retval;
648 }
649
650 void usb_remove_sysfs_dev_files(struct usb_device *udev)
651 {
652         struct device *dev = &udev->dev;
653
654         remove_power_attributes(dev);
655         remove_persist_attributes(dev);
656         device_remove_bin_file(dev, &dev_bin_attr_descriptors);
657 }
658
659 /* Interface Accociation Descriptor fields */
660 #define usb_intf_assoc_attr(field, format_string)                       \
661 static ssize_t                                                          \
662 show_iad_##field(struct device *dev, struct device_attribute *attr,     \
663                 char *buf)                                              \
664 {                                                                       \
665         struct usb_interface *intf = to_usb_interface(dev);             \
666                                                                         \
667         return sprintf(buf, format_string,                              \
668                         intf->intf_assoc->field);                       \
669 }                                                                       \
670 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
671
672 usb_intf_assoc_attr(bFirstInterface, "%02x\n")
673 usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
674 usb_intf_assoc_attr(bFunctionClass, "%02x\n")
675 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
676 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
677
678 /* Interface fields */
679 #define usb_intf_attr(field, format_string)                             \
680 static ssize_t                                                          \
681 show_##field(struct device *dev, struct device_attribute *attr, \
682                 char *buf)                                              \
683 {                                                                       \
684         struct usb_interface *intf = to_usb_interface(dev);             \
685                                                                         \
686         return sprintf(buf, format_string,                              \
687                         intf->cur_altsetting->desc.field);              \
688 }                                                                       \
689 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
690
691 usb_intf_attr(bInterfaceNumber, "%02x\n")
692 usb_intf_attr(bAlternateSetting, "%2d\n")
693 usb_intf_attr(bNumEndpoints, "%02x\n")
694 usb_intf_attr(bInterfaceClass, "%02x\n")
695 usb_intf_attr(bInterfaceSubClass, "%02x\n")
696 usb_intf_attr(bInterfaceProtocol, "%02x\n")
697
698 static ssize_t show_interface_string(struct device *dev,
699                 struct device_attribute *attr, char *buf)
700 {
701         struct usb_interface *intf;
702         char *string;
703
704         intf = to_usb_interface(dev);
705         string = intf->cur_altsetting->string;
706         barrier();              /* The altsetting might change! */
707
708         if (!string)
709                 return 0;
710         return sprintf(buf, "%s\n", string);
711 }
712 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
713
714 static ssize_t show_modalias(struct device *dev,
715                 struct device_attribute *attr, char *buf)
716 {
717         struct usb_interface *intf;
718         struct usb_device *udev;
719         struct usb_host_interface *alt;
720
721         intf = to_usb_interface(dev);
722         udev = interface_to_usbdev(intf);
723         alt = intf->cur_altsetting;
724
725         return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
726                         "ic%02Xisc%02Xip%02X\n",
727                         le16_to_cpu(udev->descriptor.idVendor),
728                         le16_to_cpu(udev->descriptor.idProduct),
729                         le16_to_cpu(udev->descriptor.bcdDevice),
730                         udev->descriptor.bDeviceClass,
731                         udev->descriptor.bDeviceSubClass,
732                         udev->descriptor.bDeviceProtocol,
733                         alt->desc.bInterfaceClass,
734                         alt->desc.bInterfaceSubClass,
735                         alt->desc.bInterfaceProtocol);
736 }
737 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
738
739 static ssize_t show_supports_autosuspend(struct device *dev,
740                 struct device_attribute *attr, char *buf)
741 {
742         struct usb_interface *intf;
743         struct usb_device *udev;
744         int ret;
745
746         intf = to_usb_interface(dev);
747         udev = interface_to_usbdev(intf);
748
749         usb_lock_device(udev);
750         /* Devices will be autosuspended even when an interface isn't claimed */
751         if (!intf->dev.driver ||
752                         to_usb_driver(intf->dev.driver)->supports_autosuspend)
753                 ret = sprintf(buf, "%u\n", 1);
754         else
755                 ret = sprintf(buf, "%u\n", 0);
756         usb_unlock_device(udev);
757
758         return ret;
759 }
760 static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
761
762 static struct attribute *intf_attrs[] = {
763         &dev_attr_bInterfaceNumber.attr,
764         &dev_attr_bAlternateSetting.attr,
765         &dev_attr_bNumEndpoints.attr,
766         &dev_attr_bInterfaceClass.attr,
767         &dev_attr_bInterfaceSubClass.attr,
768         &dev_attr_bInterfaceProtocol.attr,
769         &dev_attr_modalias.attr,
770         &dev_attr_supports_autosuspend.attr,
771         NULL,
772 };
773 static struct attribute_group intf_attr_grp = {
774         .attrs = intf_attrs,
775 };
776
777 static struct attribute *intf_assoc_attrs[] = {
778         &dev_attr_iad_bFirstInterface.attr,
779         &dev_attr_iad_bInterfaceCount.attr,
780         &dev_attr_iad_bFunctionClass.attr,
781         &dev_attr_iad_bFunctionSubClass.attr,
782         &dev_attr_iad_bFunctionProtocol.attr,
783         NULL,
784 };
785
786 static mode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
787                 struct attribute *a, int n)
788 {
789         struct usb_interface *intf = to_usb_interface(
790                         container_of(kobj, struct device, kobj));
791
792         if (intf->intf_assoc == NULL)
793                 return 0;
794         return a->mode;
795 }
796
797 static struct attribute_group intf_assoc_attr_grp = {
798         .attrs =        intf_assoc_attrs,
799         .is_visible =   intf_assoc_attrs_are_visible,
800 };
801
802 struct attribute_group *usb_interface_groups[] = {
803         &intf_attr_grp,
804         &intf_assoc_attr_grp,
805         NULL
806 };
807
808 int usb_create_sysfs_intf_files(struct usb_interface *intf)
809 {
810         struct usb_device *udev = interface_to_usbdev(intf);
811         struct usb_host_interface *alt = intf->cur_altsetting;
812         int retval;
813
814         if (intf->sysfs_files_created || intf->unregistering)
815                 return 0;
816
817         if (alt->string == NULL &&
818                         !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
819                 alt->string = usb_cache_string(udev, alt->desc.iInterface);
820         if (alt->string)
821                 retval = device_create_file(&intf->dev, &dev_attr_interface);
822         intf->sysfs_files_created = 1;
823         return 0;
824 }
825
826 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
827 {
828         if (!intf->sysfs_files_created)
829                 return;
830
831         device_remove_file(&intf->dev, &dev_attr_interface);
832         intf->sysfs_files_created = 0;
833 }