USB: Export if an interface driver supports autosuspend.
[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 "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 #ifdef  CONFIG_PM
184
185 static const char power_group[] = "power";
186
187 static ssize_t
188 show_persist(struct device *dev, struct device_attribute *attr, char *buf)
189 {
190         struct usb_device *udev = to_usb_device(dev);
191
192         return sprintf(buf, "%d\n", udev->persist_enabled);
193 }
194
195 static ssize_t
196 set_persist(struct device *dev, struct device_attribute *attr,
197                 const char *buf, size_t count)
198 {
199         struct usb_device *udev = to_usb_device(dev);
200         int value;
201
202         /* Hubs are always enabled for USB_PERSIST */
203         if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
204                 return -EPERM;
205
206         if (sscanf(buf, "%d", &value) != 1)
207                 return -EINVAL;
208         usb_pm_lock(udev);
209         udev->persist_enabled = !!value;
210         usb_pm_unlock(udev);
211         return count;
212 }
213
214 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist);
215
216 static int add_persist_attributes(struct device *dev)
217 {
218         int rc = 0;
219
220         if (is_usb_device(dev)) {
221                 struct usb_device *udev = to_usb_device(dev);
222
223                 /* Hubs are automatically enabled for USB_PERSIST,
224                  * no point in creating the attribute file.
225                  */
226                 if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
227                         rc = sysfs_add_file_to_group(&dev->kobj,
228                                         &dev_attr_persist.attr,
229                                         power_group);
230         }
231         return rc;
232 }
233
234 static void remove_persist_attributes(struct device *dev)
235 {
236         sysfs_remove_file_from_group(&dev->kobj,
237                         &dev_attr_persist.attr,
238                         power_group);
239 }
240 #else
241
242 #define add_persist_attributes(dev)     0
243 #define remove_persist_attributes(dev)  do {} while (0)
244
245 #endif  /* CONFIG_PM */
246
247 #ifdef  CONFIG_USB_SUSPEND
248
249 static ssize_t
250 show_connected_duration(struct device *dev, struct device_attribute *attr,
251                 char *buf)
252 {
253         struct usb_device *udev = to_usb_device(dev);
254
255         return sprintf(buf, "%u\n",
256                         jiffies_to_msecs(jiffies - udev->connect_time));
257 }
258
259 static DEVICE_ATTR(connected_duration, S_IRUGO, show_connected_duration, NULL);
260
261 /*
262  * If the device is resumed, the last time the device was suspended has
263  * been pre-subtracted from active_duration.  We add the current time to
264  * get the duration that the device was actually active.
265  *
266  * If the device is suspended, the active_duration is up-to-date.
267  */
268 static ssize_t
269 show_active_duration(struct device *dev, struct device_attribute *attr,
270                 char *buf)
271 {
272         struct usb_device *udev = to_usb_device(dev);
273         int duration;
274
275         if (udev->state != USB_STATE_SUSPENDED)
276                 duration = jiffies_to_msecs(jiffies + udev->active_duration);
277         else
278                 duration = jiffies_to_msecs(udev->active_duration);
279         return sprintf(buf, "%u\n", duration);
280 }
281
282 static DEVICE_ATTR(active_duration, S_IRUGO, show_active_duration, NULL);
283
284 static ssize_t
285 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
286 {
287         struct usb_device *udev = to_usb_device(dev);
288
289         return sprintf(buf, "%d\n", udev->autosuspend_delay / HZ);
290 }
291
292 static ssize_t
293 set_autosuspend(struct device *dev, struct device_attribute *attr,
294                 const char *buf, size_t count)
295 {
296         struct usb_device *udev = to_usb_device(dev);
297         int value;
298
299         if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/HZ ||
300                         value <= - INT_MAX/HZ)
301                 return -EINVAL;
302         value *= HZ;
303
304         udev->autosuspend_delay = value;
305         if (value >= 0)
306                 usb_try_autosuspend_device(udev);
307         else {
308                 if (usb_autoresume_device(udev) == 0)
309                         usb_autosuspend_device(udev);
310         }
311         return count;
312 }
313
314 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
315                 show_autosuspend, set_autosuspend);
316
317 static const char on_string[] = "on";
318 static const char auto_string[] = "auto";
319 static const char suspend_string[] = "suspend";
320
321 static ssize_t
322 show_level(struct device *dev, struct device_attribute *attr, char *buf)
323 {
324         struct usb_device *udev = to_usb_device(dev);
325         const char *p = auto_string;
326
327         if (udev->state == USB_STATE_SUSPENDED) {
328                 if (udev->autoresume_disabled)
329                         p = suspend_string;
330         } else {
331                 if (udev->autosuspend_disabled)
332                         p = on_string;
333         }
334         return sprintf(buf, "%s\n", p);
335 }
336
337 static ssize_t
338 set_level(struct device *dev, struct device_attribute *attr,
339                 const char *buf, size_t count)
340 {
341         struct usb_device *udev = to_usb_device(dev);
342         int len = count;
343         char *cp;
344         int rc = 0;
345         int old_autosuspend_disabled, old_autoresume_disabled;
346
347         cp = memchr(buf, '\n', count);
348         if (cp)
349                 len = cp - buf;
350
351         usb_lock_device(udev);
352         old_autosuspend_disabled = udev->autosuspend_disabled;
353         old_autoresume_disabled = udev->autoresume_disabled;
354
355         /* Setting the flags without calling usb_pm_lock is a subject to
356          * races, but who cares...
357          */
358         if (len == sizeof on_string - 1 &&
359                         strncmp(buf, on_string, len) == 0) {
360                 udev->autosuspend_disabled = 1;
361                 udev->autoresume_disabled = 0;
362                 rc = usb_external_resume_device(udev);
363
364         } else if (len == sizeof auto_string - 1 &&
365                         strncmp(buf, auto_string, len) == 0) {
366                 udev->autosuspend_disabled = 0;
367                 udev->autoresume_disabled = 0;
368                 rc = usb_external_resume_device(udev);
369
370         } else if (len == sizeof suspend_string - 1 &&
371                         strncmp(buf, suspend_string, len) == 0) {
372                 udev->autosuspend_disabled = 0;
373                 udev->autoresume_disabled = 1;
374                 rc = usb_external_suspend_device(udev, PMSG_SUSPEND);
375
376         } else
377                 rc = -EINVAL;
378
379         if (rc) {
380                 udev->autosuspend_disabled = old_autosuspend_disabled;
381                 udev->autoresume_disabled = old_autoresume_disabled;
382         }
383         usb_unlock_device(udev);
384         return (rc < 0 ? rc : count);
385 }
386
387 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
388
389 static int add_power_attributes(struct device *dev)
390 {
391         int rc = 0;
392
393         if (is_usb_device(dev)) {
394                 rc = sysfs_add_file_to_group(&dev->kobj,
395                                 &dev_attr_autosuspend.attr,
396                                 power_group);
397                 if (rc == 0)
398                         rc = sysfs_add_file_to_group(&dev->kobj,
399                                         &dev_attr_level.attr,
400                                         power_group);
401                 if (rc == 0)
402                         rc = sysfs_add_file_to_group(&dev->kobj,
403                                         &dev_attr_connected_duration.attr,
404                                         power_group);
405                 if (rc == 0)
406                         rc = sysfs_add_file_to_group(&dev->kobj,
407                                         &dev_attr_active_duration.attr,
408                                         power_group);
409         }
410         return rc;
411 }
412
413 static void remove_power_attributes(struct device *dev)
414 {
415         sysfs_remove_file_from_group(&dev->kobj,
416                         &dev_attr_active_duration.attr,
417                         power_group);
418         sysfs_remove_file_from_group(&dev->kobj,
419                         &dev_attr_connected_duration.attr,
420                         power_group);
421         sysfs_remove_file_from_group(&dev->kobj,
422                         &dev_attr_level.attr,
423                         power_group);
424         sysfs_remove_file_from_group(&dev->kobj,
425                         &dev_attr_autosuspend.attr,
426                         power_group);
427 }
428
429 #else
430
431 #define add_power_attributes(dev)       0
432 #define remove_power_attributes(dev)    do {} while (0)
433
434 #endif  /* CONFIG_USB_SUSPEND */
435
436
437 /* Descriptor fields */
438 #define usb_descriptor_attr_le16(field, format_string)                  \
439 static ssize_t                                                          \
440 show_##field(struct device *dev, struct device_attribute *attr, \
441                 char *buf)                                              \
442 {                                                                       \
443         struct usb_device *udev;                                        \
444                                                                         \
445         udev = to_usb_device(dev);                                      \
446         return sprintf(buf, format_string,                              \
447                         le16_to_cpu(udev->descriptor.field));           \
448 }                                                                       \
449 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
450
451 usb_descriptor_attr_le16(idVendor, "%04x\n")
452 usb_descriptor_attr_le16(idProduct, "%04x\n")
453 usb_descriptor_attr_le16(bcdDevice, "%04x\n")
454
455 #define usb_descriptor_attr(field, format_string)                       \
456 static ssize_t                                                          \
457 show_##field(struct device *dev, struct device_attribute *attr, \
458                 char *buf)                                              \
459 {                                                                       \
460         struct usb_device *udev;                                        \
461                                                                         \
462         udev = to_usb_device(dev);                                      \
463         return sprintf(buf, format_string, udev->descriptor.field);     \
464 }                                                                       \
465 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
466
467 usb_descriptor_attr(bDeviceClass, "%02x\n")
468 usb_descriptor_attr(bDeviceSubClass, "%02x\n")
469 usb_descriptor_attr(bDeviceProtocol, "%02x\n")
470 usb_descriptor_attr(bNumConfigurations, "%d\n")
471 usb_descriptor_attr(bMaxPacketSize0, "%d\n")
472
473
474
475 /* show if the device is authorized (1) or not (0) */
476 static ssize_t usb_dev_authorized_show(struct device *dev,
477                                        struct device_attribute *attr,
478                                        char *buf)
479 {
480         struct usb_device *usb_dev = to_usb_device(dev);
481         return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
482 }
483
484
485 /*
486  * Authorize a device to be used in the system
487  *
488  * Writing a 0 deauthorizes the device, writing a 1 authorizes it.
489  */
490 static ssize_t usb_dev_authorized_store(struct device *dev,
491                                         struct device_attribute *attr,
492                                         const char *buf, size_t size)
493 {
494         ssize_t result;
495         struct usb_device *usb_dev = to_usb_device(dev);
496         unsigned val;
497         result = sscanf(buf, "%u\n", &val);
498         if (result != 1)
499                 result = -EINVAL;
500         else if (val == 0)
501                 result = usb_deauthorize_device(usb_dev);
502         else
503                 result = usb_authorize_device(usb_dev);
504         return result < 0? result : size;
505 }
506
507 static DEVICE_ATTR(authorized, 0644,
508             usb_dev_authorized_show, usb_dev_authorized_store);
509
510
511 static struct attribute *dev_attrs[] = {
512         /* current configuration's attributes */
513         &dev_attr_configuration.attr,
514         &dev_attr_bNumInterfaces.attr,
515         &dev_attr_bConfigurationValue.attr,
516         &dev_attr_bmAttributes.attr,
517         &dev_attr_bMaxPower.attr,
518         &dev_attr_urbnum.attr,
519         /* device attributes */
520         &dev_attr_idVendor.attr,
521         &dev_attr_idProduct.attr,
522         &dev_attr_bcdDevice.attr,
523         &dev_attr_bDeviceClass.attr,
524         &dev_attr_bDeviceSubClass.attr,
525         &dev_attr_bDeviceProtocol.attr,
526         &dev_attr_bNumConfigurations.attr,
527         &dev_attr_bMaxPacketSize0.attr,
528         &dev_attr_speed.attr,
529         &dev_attr_busnum.attr,
530         &dev_attr_devnum.attr,
531         &dev_attr_version.attr,
532         &dev_attr_maxchild.attr,
533         &dev_attr_quirks.attr,
534         &dev_attr_authorized.attr,
535         NULL,
536 };
537 static struct attribute_group dev_attr_grp = {
538         .attrs = dev_attrs,
539 };
540
541 /* When modifying this list, be sure to modify dev_string_attrs_are_visible()
542  * accordingly.
543  */
544 static struct attribute *dev_string_attrs[] = {
545         &dev_attr_manufacturer.attr,
546         &dev_attr_product.attr,
547         &dev_attr_serial.attr,
548         NULL
549 };
550
551 static mode_t dev_string_attrs_are_visible(struct kobject *kobj,
552                 struct attribute *a, int n)
553 {
554         struct usb_device *udev = to_usb_device(
555                         container_of(kobj, struct device, kobj));
556
557         if (a == &dev_attr_manufacturer.attr) {
558                 if (udev->manufacturer == NULL)
559                         return 0;
560         } else if (a == &dev_attr_product.attr) {
561                 if (udev->product == NULL)
562                         return 0;
563         } else if (a == &dev_attr_serial.attr) {
564                 if (udev->serial == NULL)
565                         return 0;
566         }
567         return a->mode;
568 }
569
570 static struct attribute_group dev_string_attr_grp = {
571         .attrs =        dev_string_attrs,
572         .is_visible =   dev_string_attrs_are_visible,
573 };
574
575 struct attribute_group *usb_device_groups[] = {
576         &dev_attr_grp,
577         &dev_string_attr_grp,
578         NULL
579 };
580
581 /* Binary descriptors */
582
583 static ssize_t
584 read_descriptors(struct kobject *kobj, struct bin_attribute *attr,
585                 char *buf, loff_t off, size_t count)
586 {
587         struct usb_device *udev = to_usb_device(
588                         container_of(kobj, struct device, kobj));
589         size_t nleft = count;
590         size_t srclen, n;
591         int cfgno;
592         void *src;
593
594         /* The binary attribute begins with the device descriptor.
595          * Following that are the raw descriptor entries for all the
596          * configurations (config plus subsidiary descriptors).
597          */
598         for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
599                         nleft > 0; ++cfgno) {
600                 if (cfgno < 0) {
601                         src = &udev->descriptor;
602                         srclen = sizeof(struct usb_device_descriptor);
603                 } else {
604                         src = udev->rawdescriptors[cfgno];
605                         srclen = __le16_to_cpu(udev->config[cfgno].desc.
606                                         wTotalLength);
607                 }
608                 if (off < srclen) {
609                         n = min(nleft, srclen - (size_t) off);
610                         memcpy(buf, src + off, n);
611                         nleft -= n;
612                         buf += n;
613                         off = 0;
614                 } else {
615                         off -= srclen;
616                 }
617         }
618         return count - nleft;
619 }
620
621 static struct bin_attribute dev_bin_attr_descriptors = {
622         .attr = {.name = "descriptors", .mode = 0444},
623         .read = read_descriptors,
624         .size = 18 + 65535,     /* dev descr + max-size raw descriptor */
625 };
626
627 int usb_create_sysfs_dev_files(struct usb_device *udev)
628 {
629         struct device *dev = &udev->dev;
630         int retval;
631
632         /* Unforunately these attributes cannot be created before
633          * the uevent is broadcast.
634          */
635         retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
636         if (retval)
637                 goto error;
638
639         retval = add_persist_attributes(dev);
640         if (retval)
641                 goto error;
642
643         retval = add_power_attributes(dev);
644         if (retval)
645                 goto error;
646
647         retval = usb_create_ep_files(dev, &udev->ep0, udev);
648         if (retval)
649                 goto error;
650         return 0;
651 error:
652         usb_remove_sysfs_dev_files(udev);
653         return retval;
654 }
655
656 void usb_remove_sysfs_dev_files(struct usb_device *udev)
657 {
658         struct device *dev = &udev->dev;
659
660         usb_remove_ep_files(&udev->ep0);
661         remove_power_attributes(dev);
662         remove_persist_attributes(dev);
663         device_remove_bin_file(dev, &dev_bin_attr_descriptors);
664 }
665
666 /* Interface Accociation Descriptor fields */
667 #define usb_intf_assoc_attr(field, format_string)                       \
668 static ssize_t                                                          \
669 show_iad_##field(struct device *dev, struct device_attribute *attr,     \
670                 char *buf)                                              \
671 {                                                                       \
672         struct usb_interface *intf = to_usb_interface(dev);             \
673                                                                         \
674         return sprintf(buf, format_string,                              \
675                         intf->intf_assoc->field);                       \
676 }                                                                       \
677 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
678
679 usb_intf_assoc_attr(bFirstInterface, "%02x\n")
680 usb_intf_assoc_attr(bInterfaceCount, "%02d\n")
681 usb_intf_assoc_attr(bFunctionClass, "%02x\n")
682 usb_intf_assoc_attr(bFunctionSubClass, "%02x\n")
683 usb_intf_assoc_attr(bFunctionProtocol, "%02x\n")
684
685 /* Interface fields */
686 #define usb_intf_attr(field, format_string)                             \
687 static ssize_t                                                          \
688 show_##field(struct device *dev, struct device_attribute *attr, \
689                 char *buf)                                              \
690 {                                                                       \
691         struct usb_interface *intf = to_usb_interface(dev);             \
692                                                                         \
693         return sprintf(buf, format_string,                              \
694                         intf->cur_altsetting->desc.field);              \
695 }                                                                       \
696 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
697
698 usb_intf_attr(bInterfaceNumber, "%02x\n")
699 usb_intf_attr(bAlternateSetting, "%2d\n")
700 usb_intf_attr(bNumEndpoints, "%02x\n")
701 usb_intf_attr(bInterfaceClass, "%02x\n")
702 usb_intf_attr(bInterfaceSubClass, "%02x\n")
703 usb_intf_attr(bInterfaceProtocol, "%02x\n")
704
705 static ssize_t show_interface_string(struct device *dev,
706                 struct device_attribute *attr, char *buf)
707 {
708         struct usb_interface *intf;
709         char *string;
710
711         intf = to_usb_interface(dev);
712         string = intf->cur_altsetting->string;
713         barrier();              /* The altsetting might change! */
714
715         if (!string)
716                 return 0;
717         return sprintf(buf, "%s\n", string);
718 }
719 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
720
721 static ssize_t show_modalias(struct device *dev,
722                 struct device_attribute *attr, char *buf)
723 {
724         struct usb_interface *intf;
725         struct usb_device *udev;
726         struct usb_host_interface *alt;
727
728         intf = to_usb_interface(dev);
729         udev = interface_to_usbdev(intf);
730         alt = intf->cur_altsetting;
731
732         return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
733                         "ic%02Xisc%02Xip%02X\n",
734                         le16_to_cpu(udev->descriptor.idVendor),
735                         le16_to_cpu(udev->descriptor.idProduct),
736                         le16_to_cpu(udev->descriptor.bcdDevice),
737                         udev->descriptor.bDeviceClass,
738                         udev->descriptor.bDeviceSubClass,
739                         udev->descriptor.bDeviceProtocol,
740                         alt->desc.bInterfaceClass,
741                         alt->desc.bInterfaceSubClass,
742                         alt->desc.bInterfaceProtocol);
743 }
744 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
745
746 static ssize_t show_supports_autosuspend(struct device *dev,
747                 struct device_attribute *attr, char *buf)
748 {
749         struct usb_interface *intf;
750         struct usb_device *udev;
751         int ret;
752
753         intf = to_usb_interface(dev);
754         udev = interface_to_usbdev(intf);
755
756         usb_lock_device(udev);
757         /* Devices will be autosuspended even when an interface isn't claimed */
758         if (!intf->dev.driver ||
759                         to_usb_driver(intf->dev.driver)->supports_autosuspend)
760                 ret = sprintf(buf, "%u\n", 1);
761         else
762                 ret = sprintf(buf, "%u\n", 0);
763         usb_unlock_device(udev);
764
765         return ret;
766 }
767 static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
768
769 static struct attribute *intf_attrs[] = {
770         &dev_attr_bInterfaceNumber.attr,
771         &dev_attr_bAlternateSetting.attr,
772         &dev_attr_bNumEndpoints.attr,
773         &dev_attr_bInterfaceClass.attr,
774         &dev_attr_bInterfaceSubClass.attr,
775         &dev_attr_bInterfaceProtocol.attr,
776         &dev_attr_modalias.attr,
777         &dev_attr_supports_autosuspend.attr,
778         NULL,
779 };
780 static struct attribute_group intf_attr_grp = {
781         .attrs = intf_attrs,
782 };
783
784 static struct attribute *intf_assoc_attrs[] = {
785         &dev_attr_iad_bFirstInterface.attr,
786         &dev_attr_iad_bInterfaceCount.attr,
787         &dev_attr_iad_bFunctionClass.attr,
788         &dev_attr_iad_bFunctionSubClass.attr,
789         &dev_attr_iad_bFunctionProtocol.attr,
790         NULL,
791 };
792
793 static mode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
794                 struct attribute *a, int n)
795 {
796         struct usb_interface *intf = to_usb_interface(
797                         container_of(kobj, struct device, kobj));
798
799         if (intf->intf_assoc == NULL)
800                 return 0;
801         return a->mode;
802 }
803
804 static struct attribute_group intf_assoc_attr_grp = {
805         .attrs =        intf_assoc_attrs,
806         .is_visible =   intf_assoc_attrs_are_visible,
807 };
808
809 struct attribute_group *usb_interface_groups[] = {
810         &intf_attr_grp,
811         &intf_assoc_attr_grp,
812         NULL
813 };
814
815 static inline void usb_create_intf_ep_files(struct usb_interface *intf,
816                 struct usb_device *udev)
817 {
818         struct usb_host_interface *iface_desc;
819         int i;
820
821         iface_desc = intf->cur_altsetting;
822         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
823                 usb_create_ep_files(&intf->dev, &iface_desc->endpoint[i],
824                                 udev);
825 }
826
827 static inline void usb_remove_intf_ep_files(struct usb_interface *intf)
828 {
829         struct usb_host_interface *iface_desc;
830         int i;
831
832         iface_desc = intf->cur_altsetting;
833         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
834                 usb_remove_ep_files(&iface_desc->endpoint[i]);
835 }
836
837 int usb_create_sysfs_intf_files(struct usb_interface *intf)
838 {
839         struct usb_device *udev = interface_to_usbdev(intf);
840         struct usb_host_interface *alt = intf->cur_altsetting;
841         int retval;
842
843         if (intf->sysfs_files_created)
844                 return 0;
845
846         /* The interface string may be present in some altsettings
847          * and missing in others.  Hence its attribute cannot be created
848          * before the uevent is broadcast.
849          */
850         if (alt->string == NULL)
851                 alt->string = usb_cache_string(udev, alt->desc.iInterface);
852         if (alt->string)
853                 retval = device_create_file(&intf->dev, &dev_attr_interface);
854         usb_create_intf_ep_files(intf, udev);
855         intf->sysfs_files_created = 1;
856         return 0;
857 }
858
859 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
860 {
861         struct device *dev = &intf->dev;
862
863         if (!intf->sysfs_files_created)
864                 return;
865         usb_remove_intf_ep_files(intf);
866         device_remove_file(dev, &dev_attr_interface);
867         intf->sysfs_files_created = 0;
868 }