Merge branches 'release' and 'ppc-workaround' into release
[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 "usb.h"
17
18 /* Active configuration fields */
19 #define usb_actconfig_show(field, multiplier, format_string)            \
20 static ssize_t  show_##field(struct device *dev,                        \
21                 struct device_attribute *attr, char *buf)               \
22 {                                                                       \
23         struct usb_device *udev;                                        \
24         struct usb_host_config *actconfig;                              \
25                                                                         \
26         udev = to_usb_device(dev);                                      \
27         actconfig = udev->actconfig;                                    \
28         if (actconfig)                                                  \
29                 return sprintf(buf, format_string,                      \
30                                 actconfig->desc.field * multiplier);    \
31         else                                                            \
32                 return 0;                                               \
33 }                                                                       \
34
35 #define usb_actconfig_attr(field, multiplier, format_string)            \
36 usb_actconfig_show(field, multiplier, format_string)                    \
37 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
38
39 usb_actconfig_attr(bNumInterfaces, 1, "%2d\n")
40 usb_actconfig_attr(bmAttributes, 1, "%2x\n")
41 usb_actconfig_attr(bMaxPower, 2, "%3dmA\n")
42
43 static ssize_t show_configuration_string(struct device *dev,
44                 struct device_attribute *attr, char *buf)
45 {
46         struct usb_device *udev;
47         struct usb_host_config *actconfig;
48
49         udev = to_usb_device(dev);
50         actconfig = udev->actconfig;
51         if ((!actconfig) || (!actconfig->string))
52                 return 0;
53         return sprintf(buf, "%s\n", actconfig->string);
54 }
55 static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL);
56
57 /* configuration value is always present, and r/w */
58 usb_actconfig_show(bConfigurationValue, 1, "%u\n");
59
60 static ssize_t
61 set_bConfigurationValue(struct device *dev, struct device_attribute *attr,
62                 const char *buf, size_t count)
63 {
64         struct usb_device       *udev = to_usb_device(dev);
65         int                     config, value;
66
67         if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
68                 return -EINVAL;
69         usb_lock_device(udev);
70         value = usb_set_configuration(udev, config);
71         usb_unlock_device(udev);
72         return (value < 0) ? value : count;
73 }
74
75 static DEVICE_ATTR(bConfigurationValue, S_IRUGO | S_IWUSR,
76                 show_bConfigurationValue, set_bConfigurationValue);
77
78 /* String fields */
79 #define usb_string_attr(name)                                           \
80 static ssize_t  show_##name(struct device *dev,                         \
81                 struct device_attribute *attr, char *buf)               \
82 {                                                                       \
83         struct usb_device *udev;                                        \
84                                                                         \
85         udev = to_usb_device(dev);                                      \
86         return sprintf(buf, "%s\n", udev->name);                        \
87 }                                                                       \
88 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
89
90 usb_string_attr(product);
91 usb_string_attr(manufacturer);
92 usb_string_attr(serial);
93
94 static ssize_t
95 show_speed(struct device *dev, struct device_attribute *attr, char *buf)
96 {
97         struct usb_device *udev;
98         char *speed;
99
100         udev = to_usb_device(dev);
101
102         switch (udev->speed) {
103         case USB_SPEED_LOW:
104                 speed = "1.5";
105                 break;
106         case USB_SPEED_UNKNOWN:
107         case USB_SPEED_FULL:
108                 speed = "12";
109                 break;
110         case USB_SPEED_HIGH:
111                 speed = "480";
112                 break;
113         default:
114                 speed = "unknown";
115         }
116         return sprintf(buf, "%s\n", speed);
117 }
118 static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL);
119
120 static ssize_t
121 show_busnum(struct device *dev, struct device_attribute *attr, char *buf)
122 {
123         struct usb_device *udev;
124
125         udev = to_usb_device(dev);
126         return sprintf(buf, "%d\n", udev->bus->busnum);
127 }
128 static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL);
129
130 static ssize_t
131 show_devnum(struct device *dev, struct device_attribute *attr, char *buf)
132 {
133         struct usb_device *udev;
134
135         udev = to_usb_device(dev);
136         return sprintf(buf, "%d\n", udev->devnum);
137 }
138 static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL);
139
140 static ssize_t
141 show_version(struct device *dev, struct device_attribute *attr, char *buf)
142 {
143         struct usb_device *udev;
144         u16 bcdUSB;
145
146         udev = to_usb_device(dev);
147         bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
148         return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
149 }
150 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
151
152 static ssize_t
153 show_maxchild(struct device *dev, struct device_attribute *attr, char *buf)
154 {
155         struct usb_device *udev;
156
157         udev = to_usb_device(dev);
158         return sprintf(buf, "%d\n", udev->maxchild);
159 }
160 static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL);
161
162 static ssize_t
163 show_quirks(struct device *dev, struct device_attribute *attr, char *buf)
164 {
165         struct usb_device *udev;
166
167         udev = to_usb_device(dev);
168         return sprintf(buf, "0x%x\n", udev->quirks);
169 }
170 static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);
171
172 static ssize_t
173 show_urbnum(struct device *dev, struct device_attribute *attr, char *buf)
174 {
175         struct usb_device *udev;
176
177         udev = to_usb_device(dev);
178         return sprintf(buf, "%d\n", atomic_read(&udev->urbnum));
179 }
180 static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL);
181
182
183 #if defined(CONFIG_USB_PERSIST) || defined(CONFIG_USB_SUSPEND)
184 static const char power_group[] = "power";
185 #endif
186
187 #ifdef  CONFIG_USB_PERSIST
188
189 static ssize_t
190 show_persist(struct device *dev, struct device_attribute *attr, char *buf)
191 {
192         struct usb_device *udev = to_usb_device(dev);
193
194         return sprintf(buf, "%d\n", udev->persist_enabled);
195 }
196
197 static ssize_t
198 set_persist(struct device *dev, struct device_attribute *attr,
199                 const char *buf, size_t count)
200 {
201         struct usb_device *udev = to_usb_device(dev);
202         int value;
203
204         /* Hubs are always enabled for USB_PERSIST */
205         if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
206                 return -EPERM;
207
208         if (sscanf(buf, "%d", &value) != 1)
209                 return -EINVAL;
210         usb_pm_lock(udev);
211         udev->persist_enabled = !!value;
212         usb_pm_unlock(udev);
213         return count;
214 }
215
216 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
217
218 static int add_persist_attributes(struct device *dev)
219 {
220         int rc = 0;
221
222         if (is_usb_device(dev)) {
223                 struct usb_device *udev = to_usb_device(dev);
224
225                 /* Hubs are automatically enabled for USB_PERSIST */
226                 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
227                         udev->persist_enabled = 1;
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
242 #else
243
244 #define add_persist_attributes(dev)     0
245 #define remove_persist_attributes(dev)  do {} while (0)
246
247 #endif  /* CONFIG_USB_PERSIST */
248
249 #ifdef  CONFIG_USB_SUSPEND
250
251 static ssize_t
252 show_connected_duration(struct device *dev, struct device_attribute *attr,
253                 char *buf)
254 {
255         struct usb_device *udev = to_usb_device(dev);
256
257         return sprintf(buf, "%u\n",
258                         jiffies_to_msecs(jiffies - udev->connect_time));
259 }
260
261 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
262
263 /*
264  * If the device is resumed, the last time the device was suspended has
265  * been pre-subtracted from active_duration.  We add the current time to
266  * get the duration that the device was actually active.
267  *
268  * If the device is suspended, the active_duration is up-to-date.
269  */
270 static ssize_t
271 show_active_duration(struct device *dev, struct device_attribute *attr,
272                 char *buf)
273 {
274         struct usb_device *udev = to_usb_device(dev);
275         int duration;
276
277         if (udev->state != USB_STATE_SUSPENDED)
278                 duration = jiffies_to_msecs(jiffies + udev->active_duration);
279         else
280                 duration = jiffies_to_msecs(udev->active_duration);
281         return sprintf(buf, "%u\n", duration);
282 }
283
284 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
285
286 static ssize_t
287 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
288 {
289         struct usb_device *udev = to_usb_device(dev);
290
291         return sprintf(buf, "%d\n", udev->autosuspend_delay / HZ);
292 }
293
294 static ssize_t
295 set_autosuspend(struct device *dev, struct device_attribute *attr,
296                 const char *buf, size_t count)
297 {
298         struct usb_device *udev = to_usb_device(dev);
299         int value;
300
301         if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/HZ ||
302                         value <= - INT_MAX/HZ)
303                 return -EINVAL;
304         value *= HZ;
305
306         udev->autosuspend_delay = value;
307         if (value >= 0)
308                 usb_try_autosuspend_device(udev);
309         else {
310                 if (usb_autoresume_device(udev) == 0)
311                         usb_autosuspend_device(udev);
312         }
313         return count;
314 }
315
316 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
317                 show_autosuspend, set_autosuspend);
318
319 static const char on_string[] = "on";
320 static const char auto_string[] = "auto";
321 static const char suspend_string[] = "suspend";
322
323 static ssize_t
324 show_level(struct device *dev, struct device_attribute *attr, char *buf)
325 {
326         struct usb_device *udev = to_usb_device(dev);
327         const char *p = auto_string;
328
329         if (udev->state == USB_STATE_SUSPENDED) {
330                 if (udev->autoresume_disabled)
331                         p = suspend_string;
332         } else {
333                 if (udev->autosuspend_disabled)
334                         p = on_string;
335         }
336         return sprintf(buf, "%s\n", p);
337 }
338
339 static ssize_t
340 set_level(struct device *dev, struct device_attribute *attr,
341                 const char *buf, size_t count)
342 {
343         struct usb_device *udev = to_usb_device(dev);
344         int len = count;
345         char *cp;
346         int rc = 0;
347         int old_autosuspend_disabled, old_autoresume_disabled;
348
349         cp = memchr(buf, '\n', count);
350         if (cp)
351                 len = cp - buf;
352
353         usb_lock_device(udev);
354         old_autosuspend_disabled = udev->autosuspend_disabled;
355         old_autoresume_disabled = udev->autoresume_disabled;
356
357         /* Setting the flags without calling usb_pm_lock is a subject to
358          * races, but who cares...
359          */
360         if (len == sizeof on_string - 1 &&
361                         strncmp(buf, on_string, len) == 0) {
362                 udev->autosuspend_disabled = 1;
363                 udev->autoresume_disabled = 0;
364                 rc = usb_external_resume_device(udev);
365
366         } else if (len == sizeof auto_string - 1 &&
367                         strncmp(buf, auto_string, len) == 0) {
368                 udev->autosuspend_disabled = 0;
369                 udev->autoresume_disabled = 0;
370                 rc = usb_external_resume_device(udev);
371
372         } else if (len == sizeof suspend_string - 1 &&
373                         strncmp(buf, suspend_string, len) == 0) {
374                 udev->autosuspend_disabled = 0;
375                 udev->autoresume_disabled = 1;
376                 rc = usb_external_suspend_device(udev, PMSG_SUSPEND);
377
378         } else
379                 rc = -EINVAL;
380
381         if (rc) {
382                 udev->autosuspend_disabled = old_autosuspend_disabled;
383                 udev->autoresume_disabled = old_autoresume_disabled;
384         }
385         usb_unlock_device(udev);
386         return (rc < 0 ? rc : count);
387 }
388
389 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
390
391 static int add_power_attributes(struct device *dev)
392 {
393         int rc = 0;
394
395         if (is_usb_device(dev)) {
396                 rc = sysfs_add_file_to_group(&dev->kobj,
397                                 &dev_attr_autosuspend.attr,
398                                 power_group);
399                 if (rc == 0)
400                         rc = sysfs_add_file_to_group(&dev->kobj,
401                                         &dev_attr_level.attr,
402                                         power_group);
403                 if (rc == 0)
404                         rc = sysfs_add_file_to_group(&dev->kobj,
405                                         &dev_attr_connected_duration.attr,
406                                         power_group);
407                 if (rc == 0)
408                         rc = sysfs_add_file_to_group(&dev->kobj,
409                                         &dev_attr_active_duration.attr,
410                                         power_group);
411         }
412         return rc;
413 }
414
415 static void remove_power_attributes(struct device *dev)
416 {
417         sysfs_remove_file_from_group(&dev->kobj,
418                         &dev_attr_active_duration.attr,
419                         power_group);
420         sysfs_remove_file_from_group(&dev->kobj,
421                         &dev_attr_connected_duration.attr,
422                         power_group);
423         sysfs_remove_file_from_group(&dev->kobj,
424                         &dev_attr_level.attr,
425                         power_group);
426         sysfs_remove_file_from_group(&dev->kobj,
427                         &dev_attr_autosuspend.attr,
428                         power_group);
429 }
430
431 #else
432
433 #define add_power_attributes(dev)       0
434 #define remove_power_attributes(dev)    do {} while (0)
435
436 #endif  /* CONFIG_USB_SUSPEND */
437
438
439 /* Descriptor fields */
440 #define usb_descriptor_attr_le16(field, format_string)                  \
441 static ssize_t                                                          \
442 show_##field(struct device *dev, struct device_attribute *attr, \
443                 char *buf)                                              \
444 {                                                                       \
445         struct usb_device *udev;                                        \
446                                                                         \
447         udev = to_usb_device(dev);                                      \
448         return sprintf(buf, format_string,                              \
449                         le16_to_cpu(udev->descriptor.field));           \
450 }                                                                       \
451 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
452
453 usb_descriptor_attr_le16(idVendor, "%04x\n")
454 usb_descriptor_attr_le16(idProduct, "%04x\n")
455 usb_descriptor_attr_le16(bcdDevice, "%04x\n")
456
457 #define usb_descriptor_attr(field, format_string)                       \
458 static ssize_t                                                          \
459 show_##field(struct device *dev, struct device_attribute *attr, \
460                 char *buf)                                              \
461 {                                                                       \
462         struct usb_device *udev;                                        \
463                                                                         \
464         udev = to_usb_device(dev);                                      \
465         return sprintf(buf, format_string, udev->descriptor.field);     \
466 }                                                                       \
467 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
468
469 usb_descriptor_attr(bDeviceClass, "%02x\n")
470 usb_descriptor_attr(bDeviceSubClass, "%02x\n")
471 usb_descriptor_attr(bDeviceProtocol, "%02x\n")
472 usb_descriptor_attr(bNumConfigurations, "%d\n")
473 usb_descriptor_attr(bMaxPacketSize0, "%d\n")
474
475
476
477 /* show if the device is authorized (1) or not (0) */
478 static ssize_t usb_dev_authorized_show(struct device *dev,
479                                        struct device_attribute *attr,
480                                        char *buf)
481 {
482         struct usb_device *usb_dev = to_usb_device(dev);
483         return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
484 }
485
486
487 /*
488  * Authorize a device to be used in the system
489  *
490  * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
491  */
492 static ssize_t usb_dev_authorized_store(struct device *dev,
493                                         struct device_attribute *attr,
494                                         const char *buf, size_t size)
495 {
496         ssize_t result;
497         struct usb_device *usb_dev = to_usb_device(dev);
498         unsigned val;
499         result = sscanf(buf, "%u\n", &val);
500         if (result != 1)
501                 result = -EINVAL;
502         else if (val == 0)
503                 result = usb_deauthorize_device(usb_dev);
504         else
505                 result = usb_authorize_device(usb_dev);
506         return result < 0? result : size;
507 }
508
509 static DEVICE_ATTR(authorized, 0644,
510             usb_dev_authorized_show, usb_dev_authorized_store);
511
512
513 static struct attribute *dev_attrs[] = {
514         /* current configuration's attributes */
515         &dev_attr_configuration.attr,
516         &dev_attr_bNumInterfaces.attr,
517         &dev_attr_bConfigurationValue.attr,
518         &dev_attr_bmAttributes.attr,
519         &dev_attr_bMaxPower.attr,
520         &dev_attr_urbnum.attr,
521         /* device attributes */
522         &dev_attr_idVendor.attr,
523         &dev_attr_idProduct.attr,
524         &dev_attr_bcdDevice.attr,
525         &dev_attr_bDeviceClass.attr,
526         &dev_attr_bDeviceSubClass.attr,
527         &dev_attr_bDeviceProtocol.attr,
528         &dev_attr_bNumConfigurations.attr,
529         &dev_attr_bMaxPacketSize0.attr,
530         &dev_attr_speed.attr,
531         &dev_attr_busnum.attr,
532         &dev_attr_devnum.attr,
533         &dev_attr_version.attr,
534         &dev_attr_maxchild.attr,
535         &dev_attr_quirks.attr,
536         &dev_attr_authorized.attr,
537         NULL,
538 };
539 static struct attribute_group dev_attr_grp = {
540         .attrs = dev_attrs,
541 };
542
543 /* Binary descriptors */
544
545 static ssize_t
546 read_descriptors(struct kobject *kobj, struct bin_attribute *attr,
547                 char *buf, loff_t off, size_t count)
548 {
549         struct usb_device *udev = to_usb_device(
550                         container_of(kobj, struct device, kobj));
551         size_t nleft = count;
552         size_t srclen, n;
553
554         usb_lock_device(udev);
555
556         /* The binary attribute begins with the device descriptor */
557         srclen = sizeof(struct usb_device_descriptor);
558         if (off < srclen) {
559                 n = min_t(size_t, nleft, srclen - off);
560                 memcpy(buf, off + (char *) &udev->descriptor, n);
561                 nleft -= n;
562                 buf += n;
563                 off = 0;
564         } else {
565                 off -= srclen;
566         }
567
568         /* Then follows the raw descriptor entry for the current
569          * configuration (config plus subsidiary descriptors).
570          */
571         if (udev->actconfig) {
572                 int cfgno = udev->actconfig - udev->config;
573
574                 srclen = __le16_to_cpu(udev->actconfig->desc.wTotalLength);
575                 if (off < srclen) {
576                         n = min_t(size_t, nleft, srclen - off);
577                         memcpy(buf, off + udev->rawdescriptors[cfgno], n);
578                         nleft -= n;
579                 }
580         }
581         usb_unlock_device(udev);
582         return count - nleft;
583 }
584
585 static struct bin_attribute dev_bin_attr_descriptors = {
586         .attr = {.name = "descriptors", .mode = 0444},
587         .read = read_descriptors,
588         .size = 18 + 65535,     /* dev descr + max-size raw descriptor */
589 };
590
591 int usb_create_sysfs_dev_files(struct usb_device *udev)
592 {
593         struct device *dev = &udev->dev;
594         int retval;
595
596         retval = sysfs_create_group(&dev->kobj, &dev_attr_grp);
597         if (retval)
598                 return retval;
599
600         retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
601         if (retval)
602                 goto error;
603
604         retval = add_persist_attributes(dev);
605         if (retval)
606                 goto error;
607
608         retval = add_power_attributes(dev);
609         if (retval)
610                 goto error;
611
612         if (udev->manufacturer) {
613                 retval = device_create_file(dev, &dev_attr_manufacturer);
614                 if (retval)
615                         goto error;
616         }
617         if (udev->product) {
618                 retval = device_create_file(dev, &dev_attr_product);
619                 if (retval)
620                         goto error;
621         }
622         if (udev->serial) {
623                 retval = device_create_file(dev, &dev_attr_serial);
624                 if (retval)
625                         goto error;
626         }
627         retval = usb_create_ep_files(dev, &udev->ep0, udev);
628         if (retval)
629                 goto error;
630         return 0;
631 error:
632         usb_remove_sysfs_dev_files(udev);
633         return retval;
634 }
635
636 void usb_remove_sysfs_dev_files(struct usb_device *udev)
637 {
638         struct device *dev = &udev->dev;
639
640         usb_remove_ep_files(&udev->ep0);
641         device_remove_file(dev, &dev_attr_manufacturer);
642         device_remove_file(dev, &dev_attr_product);
643         device_remove_file(dev, &dev_attr_serial);
644         remove_power_attributes(dev);
645         remove_persist_attributes(dev);
646         device_remove_bin_file(dev, &dev_bin_attr_descriptors);
647         sysfs_remove_group(&dev->kobj, &dev_attr_grp);
648 }
649
650 /* Interface Accociation Descriptor fields */
651 #define usb_intf_assoc_attr(field, format_string)                       \
652 static ssize_t                                                          \
653 show_iad_##field(struct device *dev, struct device_attribute *attr,     \
654                 char *buf)                                              \
655 {                                                                       \
656         struct usb_interface *intf = to_usb_interface(dev);             \
657                                                                         \
658         return sprintf(buf, format_string,                              \
659                         intf->intf_assoc->field);                       \
660 }                                                                       \
661 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
662
663 usb_intf_assoc_attr(bFirstInterface, "%02x\n")
664 usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
665 usb_intf_assoc_attr(bFunctionClass, "%02x\n")
666 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
667 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
668
669 /* Interface fields */
670 #define usb_intf_attr(field, format_string)                             \
671 static ssize_t                                                          \
672 show_##field(struct device *dev, struct device_attribute *attr, \
673                 char *buf)                                              \
674 {                                                                       \
675         struct usb_interface *intf = to_usb_interface(dev);             \
676                                                                         \
677         return sprintf(buf, format_string,                              \
678                         intf->cur_altsetting->desc.field);              \
679 }                                                                       \
680 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
681
682 usb_intf_attr(bInterfaceNumber, "%02x\n")
683 usb_intf_attr(bAlternateSetting, "%2d\n")
684 usb_intf_attr(bNumEndpoints, "%02x\n")
685 usb_intf_attr(bInterfaceClass, "%02x\n")
686 usb_intf_attr(bInterfaceSubClass, "%02x\n")
687 usb_intf_attr(bInterfaceProtocol, "%02x\n")
688
689 static ssize_t show_interface_string(struct device *dev,
690                 struct device_attribute *attr, char *buf)
691 {
692         struct usb_interface *intf;
693         struct usb_device *udev;
694         int len;
695
696         intf = to_usb_interface(dev);
697         udev = interface_to_usbdev(intf);
698         len = snprintf(buf, 256, "%s", intf->cur_altsetting->string);
699         if (len < 0)
700                 return 0;
701         buf[len] = '\n';
702         buf[len+1] = 0;
703         return len+1;
704 }
705 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
706
707 static ssize_t show_modalias(struct device *dev,
708                 struct device_attribute *attr, char *buf)
709 {
710         struct usb_interface *intf;
711         struct usb_device *udev;
712         struct usb_host_interface *alt;
713
714         intf = to_usb_interface(dev);
715         udev = interface_to_usbdev(intf);
716         alt = intf->cur_altsetting;
717
718         return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
719                         "ic%02Xisc%02Xip%02X\n",
720                         le16_to_cpu(udev->descriptor.idVendor),
721                         le16_to_cpu(udev->descriptor.idProduct),
722                         le16_to_cpu(udev->descriptor.bcdDevice),
723                         udev->descriptor.bDeviceClass,
724                         udev->descriptor.bDeviceSubClass,
725                         udev->descriptor.bDeviceProtocol,
726                         alt->desc.bInterfaceClass,
727                         alt->desc.bInterfaceSubClass,
728                         alt->desc.bInterfaceProtocol);
729 }
730 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
731
732 static struct attribute *intf_assoc_attrs[] = {
733         &dev_attr_iad_bFirstInterface.attr,
734         &dev_attr_iad_bInterfaceCount.attr,
735         &dev_attr_iad_bFunctionClass.attr,
736         &dev_attr_iad_bFunctionSubClass.attr,
737         &dev_attr_iad_bFunctionProtocol.attr,
738         NULL,
739 };
740 static struct attribute_group intf_assoc_attr_grp = {
741         .attrs = intf_assoc_attrs,
742 };
743
744 static struct attribute *intf_attrs[] = {
745         &dev_attr_bInterfaceNumber.attr,
746         &dev_attr_bAlternateSetting.attr,
747         &dev_attr_bNumEndpoints.attr,
748         &dev_attr_bInterfaceClass.attr,
749         &dev_attr_bInterfaceSubClass.attr,
750         &dev_attr_bInterfaceProtocol.attr,
751         &dev_attr_modalias.attr,
752         NULL,
753 };
754 static struct attribute_group intf_attr_grp = {
755         .attrs = intf_attrs,
756 };
757
758 static inline void usb_create_intf_ep_files(struct usb_interface *intf,
759                 struct usb_device *udev)
760 {
761         struct usb_host_interface *iface_desc;
762         int i;
763
764         iface_desc = intf->cur_altsetting;
765         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
766                 usb_create_ep_files(&intf->dev, &iface_desc->endpoint[i],
767                                 udev);
768 }
769
770 static inline void usb_remove_intf_ep_files(struct usb_interface *intf)
771 {
772         struct usb_host_interface *iface_desc;
773         int i;
774
775         iface_desc = intf->cur_altsetting;
776         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
777                 usb_remove_ep_files(&iface_desc->endpoint[i]);
778 }
779
780 int usb_create_sysfs_intf_files(struct usb_interface *intf)
781 {
782         struct device *dev = &intf->dev;
783         struct usb_device *udev = interface_to_usbdev(intf);
784         struct usb_host_interface *alt = intf->cur_altsetting;
785         int retval;
786
787         if (intf->sysfs_files_created)
788                 return 0;
789         retval = sysfs_create_group(&dev->kobj, &intf_attr_grp);
790         if (retval)
791                 return retval;
792
793         if (alt->string == NULL)
794                 alt->string = usb_cache_string(udev, alt->desc.iInterface);
795         if (alt->string)
796                 retval = device_create_file(dev, &dev_attr_interface);
797         if (intf->intf_assoc)
798                 retval = sysfs_create_group(&dev->kobj, &intf_assoc_attr_grp);
799         usb_create_intf_ep_files(intf, udev);
800         intf->sysfs_files_created = 1;
801         return 0;
802 }
803
804 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
805 {
806         struct device *dev = &intf->dev;
807
808         if (!intf->sysfs_files_created)
809                 return;
810         usb_remove_intf_ep_files(intf);
811         device_remove_file(dev, &dev_attr_interface);
812         sysfs_remove_group(&dev->kobj, &intf_attr_grp);
813         sysfs_remove_group(&intf->dev.kobj, &intf_assoc_attr_grp);
814         intf->sysfs_files_created = 0;
815 }