b65c1eaf3aba1e658ae712c3bb5d68a775d0d50f
[linux-2.6.git] / 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         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 }                                                                       \
93 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
94
95 usb_string_attr(product);
96 usb_string_attr(manufacturer);
97 usb_string_attr(serial);
98
99 static ssize_t
100 show_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 }
129 static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL);
130
131 static ssize_t
132 show_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 }
139 static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL);
140
141 static ssize_t
142 show_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 }
149 static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL);
150
151 static ssize_t
152 show_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 }
159 static DEVICE_ATTR(devpath, S_IRUGO, show_devpath, NULL);
160
161 static ssize_t
162 show_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 }
171 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
172
173 static ssize_t
174 show_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 }
181 static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL);
182
183 static ssize_t
184 show_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 }
191 static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);
192
193 static ssize_t
194 show_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
202 static ssize_t
203 set_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
220 static DEVICE_ATTR(avoid_reset_quirk, S_IRUGO | S_IWUSR,
221                 show_avoid_reset_quirk, set_avoid_reset_quirk);
222
223 static ssize_t
224 show_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 }
231 static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL);
232
233
234 #ifdef  CONFIG_PM
235
236 static const char power_group[] = "power";
237
238 static ssize_t
239 show_persist(struct device *dev, struct device_attribute *attr, char *buf)
240 {
241         struct usb_device *udev = to_usb_device(dev);
242
243         return sprintf(buf, "%d\n", udev->persist_enabled);
244 }
245
246 static ssize_t
247 set_persist(struct device *dev, struct device_attribute *attr,
248                 const char *buf, size_t count)
249 {
250         struct usb_device *udev = to_usb_device(dev);
251         int value;
252
253         /* Hubs are always enabled for USB_PERSIST */
254         if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
255                 return -EPERM;
256
257         if (sscanf(buf, "%d", &value) != 1)
258                 return -EINVAL;
259
260         usb_lock_device(udev);
261         udev->persist_enabled = !!value;
262         usb_unlock_device(udev);
263         return count;
264 }
265
266 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
267
268 static int add_persist_attributes(struct device *dev)
269 {
270         int rc = 0;
271
272         if (is_usb_device(dev)) {
273                 struct usb_device *udev = to_usb_device(dev);
274
275                 /* Hubs are automatically enabled for USB_PERSIST,
276                  * no point in creating the attribute file.
277                  */
278                 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
279                         rc = sysfs_add_file_to_group(&dev->kobj,
280                                         &dev_attr_persist.attr,
281                                         power_group);
282         }
283         return rc;
284 }
285
286 static void remove_persist_attributes(struct device *dev)
287 {
288         sysfs_remove_file_from_group(&dev->kobj,
289                         &dev_attr_persist.attr,
290                         power_group);
291 }
292 #else
293
294 #define add_persist_attributes(dev)     0
295 #define remove_persist_attributes(dev)  do {} while (0)
296
297 #endif  /* CONFIG_PM */
298
299 #ifdef  CONFIG_USB_SUSPEND
300
301 static ssize_t
302 show_connected_duration(struct device *dev, struct device_attribute *attr,
303                 char *buf)
304 {
305         struct usb_device *udev = to_usb_device(dev);
306
307         return sprintf(buf, "%u\n",
308                         jiffies_to_msecs(jiffies - udev->connect_time));
309 }
310
311 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
312
313 /*
314  * If the device is resumed, the last time the device was suspended has
315  * been pre-subtracted from active_duration.  We add the current time to
316  * get the duration that the device was actually active.
317  *
318  * If the device is suspended, the active_duration is up-to-date.
319  */
320 static ssize_t
321 show_active_duration(struct device *dev, struct device_attribute *attr,
322                 char *buf)
323 {
324         struct usb_device *udev = to_usb_device(dev);
325         int duration;
326
327         if (udev->state != USB_STATE_SUSPENDED)
328                 duration = jiffies_to_msecs(jiffies + udev->active_duration);
329         else
330                 duration = jiffies_to_msecs(udev->active_duration);
331         return sprintf(buf, "%u\n", duration);
332 }
333
334 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
335
336 static ssize_t
337 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
338 {
339         struct usb_device *udev = to_usb_device(dev);
340
341         return sprintf(buf, "%d\n", udev->autosuspend_delay / HZ);
342 }
343
344 static ssize_t
345 set_autosuspend(struct device *dev, struct device_attribute *attr,
346                 const char *buf, size_t count)
347 {
348         struct usb_device *udev = to_usb_device(dev);
349         int value, old_delay;
350         int rc;
351
352         if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/HZ ||
353                         value <= - INT_MAX/HZ)
354                 return -EINVAL;
355         value *= HZ;
356
357         usb_lock_device(udev);
358         old_delay = udev->autosuspend_delay;
359         udev->autosuspend_delay = value;
360
361         if (old_delay < 0) {    /* Autosuspend wasn't allowed */
362                 if (value >= 0)
363                         usb_autosuspend_device(udev);
364         } else {                /* Autosuspend was allowed */
365                 if (value < 0) {
366                         rc = usb_autoresume_device(udev);
367                         if (rc < 0) {
368                                 count = rc;
369                                 udev->autosuspend_delay = old_delay;
370                         }
371                 } else {
372                         usb_try_autosuspend_device(udev);
373                 }
374         }
375
376         usb_unlock_device(udev);
377         return count;
378 }
379
380 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
381                 show_autosuspend, set_autosuspend);
382
383 static const char on_string[] = "on";
384 static const char auto_string[] = "auto";
385
386 static ssize_t
387 show_level(struct device *dev, struct device_attribute *attr, char *buf)
388 {
389         struct usb_device *udev = to_usb_device(dev);
390         const char *p = auto_string;
391
392         if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
393                 p = on_string;
394         return sprintf(buf, "%s\n", p);
395 }
396
397 static ssize_t
398 set_level(struct device *dev, struct device_attribute *attr,
399                 const char *buf, size_t count)
400 {
401         struct usb_device *udev = to_usb_device(dev);
402         int len = count;
403         char *cp;
404         int rc = count;
405
406         cp = memchr(buf, '\n', count);
407         if (cp)
408                 len = cp - buf;
409
410         usb_lock_device(udev);
411
412         if (len == sizeof on_string - 1 &&
413                         strncmp(buf, on_string, len) == 0)
414                 usb_disable_autosuspend(udev);
415
416         else if (len == sizeof auto_string - 1 &&
417                         strncmp(buf, auto_string, len) == 0)
418                 usb_enable_autosuspend(udev);
419
420         else
421                 rc = -EINVAL;
422
423         usb_unlock_device(udev);
424         return rc;
425 }
426
427 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
428
429 static int add_power_attributes(struct device *dev)
430 {
431         int rc = 0;
432
433         if (is_usb_device(dev)) {
434                 rc = sysfs_add_file_to_group(&dev->kobj,
435                                 &dev_attr_autosuspend.attr,
436                                 power_group);
437                 if (rc == 0)
438                         rc = sysfs_add_file_to_group(&dev->kobj,
439                                         &dev_attr_level.attr,
440                                         power_group);
441                 if (rc == 0)
442                         rc = sysfs_add_file_to_group(&dev->kobj,
443                                         &dev_attr_connected_duration.attr,
444                                         power_group);
445                 if (rc == 0)
446                         rc = sysfs_add_file_to_group(&dev->kobj,
447                                         &dev_attr_active_duration.attr,
448                                         power_group);
449         }
450         return rc;
451 }
452
453 static void remove_power_attributes(struct device *dev)
454 {
455         sysfs_remove_file_from_group(&dev->kobj,
456                         &dev_attr_active_duration.attr,
457                         power_group);
458         sysfs_remove_file_from_group(&dev->kobj,
459                         &dev_attr_connected_duration.attr,
460                         power_group);
461         sysfs_remove_file_from_group(&dev->kobj,
462                         &dev_attr_level.attr,
463                         power_group);
464         sysfs_remove_file_from_group(&dev->kobj,
465                         &dev_attr_autosuspend.attr,
466                         power_group);
467 }
468
469 #else
470
471 #define add_power_attributes(dev)       0
472 #define remove_power_attributes(dev)    do {} while (0)
473
474 #endif  /* CONFIG_USB_SUSPEND */
475
476
477 /* Descriptor fields */
478 #define usb_descriptor_attr_le16(field, format_string)                  \
479 static ssize_t                                                          \
480 show_##field(struct device *dev, struct device_attribute *attr, \
481                 char *buf)                                              \
482 {                                                                       \
483         struct usb_device *udev;                                        \
484                                                                         \
485         udev = to_usb_device(dev);                                      \
486         return sprintf(buf, format_string,                              \
487                         le16_to_cpu(udev->descriptor.field));           \
488 }                                                                       \
489 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
490
491 usb_descriptor_attr_le16(idVendor, "%04x\n")
492 usb_descriptor_attr_le16(idProduct, "%04x\n")
493 usb_descriptor_attr_le16(bcdDevice, "%04x\n")
494
495 #define usb_descriptor_attr(field, format_string)                       \
496 static ssize_t                                                          \
497 show_##field(struct device *dev, struct device_attribute *attr, \
498                 char *buf)                                              \
499 {                                                                       \
500         struct usb_device *udev;                                        \
501                                                                         \
502         udev = to_usb_device(dev);                                      \
503         return sprintf(buf, format_string, udev->descriptor.field);     \
504 }                                                                       \
505 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
506
507 usb_descriptor_attr(bDeviceClass, "%02x\n")
508 usb_descriptor_attr(bDeviceSubClass, "%02x\n")
509 usb_descriptor_attr(bDeviceProtocol, "%02x\n")
510 usb_descriptor_attr(bNumConfigurations, "%d\n")
511 usb_descriptor_attr(bMaxPacketSize0, "%d\n")
512
513
514
515 /* show if the device is authorized (1) or not (0) */
516 static ssize_t usb_dev_authorized_show(struct device *dev,
517                                        struct device_attribute *attr,
518                                        char *buf)
519 {
520         struct usb_device *usb_dev = to_usb_device(dev);
521         return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
522 }
523
524
525 /*
526  * Authorize a device to be used in the system
527  *
528  * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
529  */
530 static ssize_t usb_dev_authorized_store(struct device *dev,
531                                         struct device_attribute *attr,
532                                         const char *buf, size_t size)
533 {
534         ssize_t result;
535         struct usb_device *usb_dev = to_usb_device(dev);
536         unsigned val;
537         result = sscanf(buf, "%u\n", &val);
538         if (result != 1)
539                 result = -EINVAL;
540         else if (val == 0)
541                 result = usb_deauthorize_device(usb_dev);
542         else
543                 result = usb_authorize_device(usb_dev);
544         return result < 0? result : size;
545 }
546
547 static DEVICE_ATTR(authorized, 0644,
548             usb_dev_authorized_show, usb_dev_authorized_store);
549
550 /* "Safely remove a device" */
551 static ssize_t usb_remove_store(struct device *dev,
552                 struct device_attribute *attr,
553                 const char *buf, size_t count)
554 {
555         struct usb_device *udev = to_usb_device(dev);
556         int rc = 0;
557
558         usb_lock_device(udev);
559         if (udev->state != USB_STATE_NOTATTACHED) {
560
561                 /* To avoid races, first unconfigure and then remove */
562                 usb_set_configuration(udev, -1);
563                 rc = usb_remove_device(udev);
564         }
565         if (rc == 0)
566                 rc = count;
567         usb_unlock_device(udev);
568         return rc;
569 }
570 static DEVICE_ATTR(remove, 0200, NULL, usb_remove_store);
571
572
573 static struct attribute *dev_attrs[] = {
574         /* current configuration's attributes */
575         &dev_attr_configuration.attr,
576         &dev_attr_bNumInterfaces.attr,
577         &dev_attr_bConfigurationValue.attr,
578         &dev_attr_bmAttributes.attr,
579         &dev_attr_bMaxPower.attr,
580         /* device attributes */
581         &dev_attr_urbnum.attr,
582         &dev_attr_idVendor.attr,
583         &dev_attr_idProduct.attr,
584         &dev_attr_bcdDevice.attr,
585         &dev_attr_bDeviceClass.attr,
586         &dev_attr_bDeviceSubClass.attr,
587         &dev_attr_bDeviceProtocol.attr,
588         &dev_attr_bNumConfigurations.attr,
589         &dev_attr_bMaxPacketSize0.attr,
590         &dev_attr_speed.attr,
591         &dev_attr_busnum.attr,
592         &dev_attr_devnum.attr,
593         &dev_attr_devpath.attr,
594         &dev_attr_version.attr,
595         &dev_attr_maxchild.attr,
596         &dev_attr_quirks.attr,
597         &dev_attr_avoid_reset_quirk.attr,
598         &dev_attr_authorized.attr,
599         &dev_attr_remove.attr,
600         NULL,
601 };
602 static struct attribute_group dev_attr_grp = {
603         .attrs = dev_attrs,
604 };
605
606 /* When modifying this list, be sure to modify dev_string_attrs_are_visible()
607  * accordingly.
608  */
609 static struct attribute *dev_string_attrs[] = {
610         &dev_attr_manufacturer.attr,
611         &dev_attr_product.attr,
612         &dev_attr_serial.attr,
613         NULL
614 };
615
616 static mode_t dev_string_attrs_are_visible(struct kobject *kobj,
617                 struct attribute *a, int n)
618 {
619         struct device *dev = container_of(kobj, struct device, kobj);
620         struct usb_device *udev = to_usb_device(dev);
621
622         if (a == &dev_attr_manufacturer.attr) {
623                 if (udev->manufacturer == NULL)
624                         return 0;
625         } else if (a == &dev_attr_product.attr) {
626                 if (udev->product == NULL)
627                         return 0;
628         } else if (a == &dev_attr_serial.attr) {
629                 if (udev->serial == NULL)
630                         return 0;
631         }
632         return a->mode;
633 }
634
635 static struct attribute_group dev_string_attr_grp = {
636         .attrs =        dev_string_attrs,
637         .is_visible =   dev_string_attrs_are_visible,
638 };
639
640 const struct attribute_group *usb_device_groups[] = {
641         &dev_attr_grp,
642         &dev_string_attr_grp,
643         NULL
644 };
645
646 /* Binary descriptors */
647
648 static ssize_t
649 read_descriptors(struct kobject *kobj, struct bin_attribute *attr,
650                 char *buf, loff_t off, size_t count)
651 {
652         struct device *dev = container_of(kobj, struct device, kobj);
653         struct usb_device *udev = to_usb_device(dev);
654         size_t nleft = count;
655         size_t srclen, n;
656         int cfgno;
657         void *src;
658
659         /* The binary attribute begins with the device descriptor.
660          * Following that are the raw descriptor entries for all the
661          * configurations (config plus subsidiary descriptors).
662          */
663         for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
664                         nleft > 0; ++cfgno) {
665                 if (cfgno < 0) {
666                         src = &udev->descriptor;
667                         srclen = sizeof(struct usb_device_descriptor);
668                 } else {
669                         src = udev->rawdescriptors[cfgno];
670                         srclen = __le16_to_cpu(udev->config[cfgno].desc.
671                                         wTotalLength);
672                 }
673                 if (off < srclen) {
674                         n = min(nleft, srclen - (size_t) off);
675                         memcpy(buf, src + off, n);
676                         nleft -= n;
677                         buf += n;
678                         off = 0;
679                 } else {
680                         off -= srclen;
681                 }
682         }
683         return count - nleft;
684 }
685
686 static struct bin_attribute dev_bin_attr_descriptors = {
687         .attr = {.name = "descriptors", .mode = 0444},
688         .read = read_descriptors,
689         .size = 18 + 65535,     /* dev descr + max-size raw descriptor */
690 };
691
692 int usb_create_sysfs_dev_files(struct usb_device *udev)
693 {
694         struct device *dev = &udev->dev;
695         int retval;
696
697         retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
698         if (retval)
699                 goto error;
700
701         retval = add_persist_attributes(dev);
702         if (retval)
703                 goto error;
704
705         retval = add_power_attributes(dev);
706         if (retval)
707                 goto error;
708         return retval;
709 error:
710         usb_remove_sysfs_dev_files(udev);
711         return retval;
712 }
713
714 void usb_remove_sysfs_dev_files(struct usb_device *udev)
715 {
716         struct device *dev = &udev->dev;
717
718         remove_power_attributes(dev);
719         remove_persist_attributes(dev);
720         device_remove_bin_file(dev, &dev_bin_attr_descriptors);
721 }
722
723 /* Interface Accociation Descriptor fields */
724 #define usb_intf_assoc_attr(field, format_string)                       \
725 static ssize_t                                                          \
726 show_iad_##field(struct device *dev, struct device_attribute *attr,     \
727                 char *buf)                                              \
728 {                                                                       \
729         struct usb_interface *intf = to_usb_interface(dev);             \
730                                                                         \
731         return sprintf(buf, format_string,                              \
732                         intf->intf_assoc->field);                       \
733 }                                                                       \
734 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
735
736 usb_intf_assoc_attr(bFirstInterface, "%02x\n")
737 usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
738 usb_intf_assoc_attr(bFunctionClass, "%02x\n")
739 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
740 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
741
742 /* Interface fields */
743 #define usb_intf_attr(field, format_string)                             \
744 static ssize_t                                                          \
745 show_##field(struct device *dev, struct device_attribute *attr, \
746                 char *buf)                                              \
747 {                                                                       \
748         struct usb_interface *intf = to_usb_interface(dev);             \
749                                                                         \
750         return sprintf(buf, format_string,                              \
751                         intf->cur_altsetting->desc.field);              \
752 }                                                                       \
753 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
754
755 usb_intf_attr(bInterfaceNumber, "%02x\n")
756 usb_intf_attr(bAlternateSetting, "%2d\n")
757 usb_intf_attr(bNumEndpoints, "%02x\n")
758 usb_intf_attr(bInterfaceClass, "%02x\n")
759 usb_intf_attr(bInterfaceSubClass, "%02x\n")
760 usb_intf_attr(bInterfaceProtocol, "%02x\n")
761
762 static ssize_t show_interface_string(struct device *dev,
763                 struct device_attribute *attr, char *buf)
764 {
765         struct usb_interface *intf;
766         char *string;
767
768         intf = to_usb_interface(dev);
769         string = intf->cur_altsetting->string;
770         barrier();              /* The altsetting might change! */
771
772         if (!string)
773                 return 0;
774         return sprintf(buf, "%s\n", string);
775 }
776 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
777
778 static ssize_t show_modalias(struct device *dev,
779                 struct device_attribute *attr, char *buf)
780 {
781         struct usb_interface *intf;
782         struct usb_device *udev;
783         struct usb_host_interface *alt;
784
785         intf = to_usb_interface(dev);
786         udev = interface_to_usbdev(intf);
787         alt = intf->cur_altsetting;
788
789         return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
790                         "ic%02Xisc%02Xip%02X\n",
791                         le16_to_cpu(udev->descriptor.idVendor),
792                         le16_to_cpu(udev->descriptor.idProduct),
793                         le16_to_cpu(udev->descriptor.bcdDevice),
794                         udev->descriptor.bDeviceClass,
795                         udev->descriptor.bDeviceSubClass,
796                         udev->descriptor.bDeviceProtocol,
797                         alt->desc.bInterfaceClass,
798                         alt->desc.bInterfaceSubClass,
799                         alt->desc.bInterfaceProtocol);
800 }
801 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
802
803 static ssize_t show_supports_autosuspend(struct device *dev,
804                 struct device_attribute *attr, char *buf)
805 {
806         struct usb_interface *intf;
807         struct usb_device *udev;
808         int ret;
809
810         intf = to_usb_interface(dev);
811         udev = interface_to_usbdev(intf);
812
813         usb_lock_device(udev);
814         /* Devices will be autosuspended even when an interface isn't claimed */
815         if (!intf->dev.driver ||
816                         to_usb_driver(intf->dev.driver)->supports_autosuspend)
817                 ret = sprintf(buf, "%u\n", 1);
818         else
819                 ret = sprintf(buf, "%u\n", 0);
820         usb_unlock_device(udev);
821
822         return ret;
823 }
824 static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
825
826 static struct attribute *intf_attrs[] = {
827         &dev_attr_bInterfaceNumber.attr,
828         &dev_attr_bAlternateSetting.attr,
829         &dev_attr_bNumEndpoints.attr,
830         &dev_attr_bInterfaceClass.attr,
831         &dev_attr_bInterfaceSubClass.attr,
832         &dev_attr_bInterfaceProtocol.attr,
833         &dev_attr_modalias.attr,
834         &dev_attr_supports_autosuspend.attr,
835         NULL,
836 };
837 static struct attribute_group intf_attr_grp = {
838         .attrs = intf_attrs,
839 };
840
841 static struct attribute *intf_assoc_attrs[] = {
842         &dev_attr_iad_bFirstInterface.attr,
843         &dev_attr_iad_bInterfaceCount.attr,
844         &dev_attr_iad_bFunctionClass.attr,
845         &dev_attr_iad_bFunctionSubClass.attr,
846         &dev_attr_iad_bFunctionProtocol.attr,
847         NULL,
848 };
849
850 static mode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
851                 struct attribute *a, int n)
852 {
853         struct device *dev = container_of(kobj, struct device, kobj);
854         struct usb_interface *intf = to_usb_interface(dev);
855
856         if (intf->intf_assoc == NULL)
857                 return 0;
858         return a->mode;
859 }
860
861 static struct attribute_group intf_assoc_attr_grp = {
862         .attrs =        intf_assoc_attrs,
863         .is_visible =   intf_assoc_attrs_are_visible,
864 };
865
866 const struct attribute_group *usb_interface_groups[] = {
867         &intf_attr_grp,
868         &intf_assoc_attr_grp,
869         NULL
870 };
871
872 int usb_create_sysfs_intf_files(struct usb_interface *intf)
873 {
874         struct usb_device *udev = interface_to_usbdev(intf);
875         struct usb_host_interface *alt = intf->cur_altsetting;
876         int retval;
877
878         if (intf->sysfs_files_created || intf->unregistering)
879                 return 0;
880
881         if (alt->string == NULL &&
882                         !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
883                 alt->string = usb_cache_string(udev, alt->desc.iInterface);
884         if (alt->string)
885                 retval = device_create_file(&intf->dev, &dev_attr_interface);
886         intf->sysfs_files_created = 1;
887         return 0;
888 }
889
890 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
891 {
892         if (!intf->sysfs_files_created)
893                 return;
894
895         device_remove_file(&intf->dev, &dev_attr_interface);
896         intf->sysfs_files_created = 0;
897 }