Driver core: remove class_device_*_bin_file
[linux-2.6.git] / drivers / base / class.c
1 /*
2  * class.c - basic device class management
3  *
4  * Copyright (c) 2002-3 Patrick Mochel
5  * Copyright (c) 2002-3 Open Source Development Labs
6  * Copyright (c) 2003-2004 Greg Kroah-Hartman
7  * Copyright (c) 2003-2004 IBM Corp.
8  *
9  * This file is released under the GPLv2
10  *
11  */
12
13 #include <linux/device.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/string.h>
17 #include <linux/kdev_t.h>
18 #include <linux/err.h>
19 #include <linux/slab.h>
20 #include "base.h"
21
22 #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)
23 #define to_class(obj) container_of(obj, struct class, subsys.kobj)
24
25 static ssize_t
26 class_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
27 {
28         struct class_attribute * class_attr = to_class_attr(attr);
29         struct class * dc = to_class(kobj);
30         ssize_t ret = -EIO;
31
32         if (class_attr->show)
33                 ret = class_attr->show(dc, buf);
34         return ret;
35 }
36
37 static ssize_t
38 class_attr_store(struct kobject * kobj, struct attribute * attr,
39                  const char * buf, size_t count)
40 {
41         struct class_attribute * class_attr = to_class_attr(attr);
42         struct class * dc = to_class(kobj);
43         ssize_t ret = -EIO;
44
45         if (class_attr->store)
46                 ret = class_attr->store(dc, buf, count);
47         return ret;
48 }
49
50 static void class_release(struct kobject * kobj)
51 {
52         struct class *class = to_class(kobj);
53
54         pr_debug("class '%s': release.\n", class->name);
55
56         if (class->class_release)
57                 class->class_release(class);
58         else
59                 pr_debug("class '%s' does not have a release() function, "
60                          "be careful\n", class->name);
61 }
62
63 static struct sysfs_ops class_sysfs_ops = {
64         .show   = class_attr_show,
65         .store  = class_attr_store,
66 };
67
68 static struct kobj_type class_ktype = {
69         .sysfs_ops      = &class_sysfs_ops,
70         .release        = class_release,
71 };
72
73 /* Hotplug events for classes go to the class_obj subsys */
74 static decl_subsys(class, &class_ktype, NULL);
75
76
77 int class_create_file(struct class * cls, const struct class_attribute * attr)
78 {
79         int error;
80         if (cls) {
81                 error = sysfs_create_file(&cls->subsys.kobj, &attr->attr);
82         } else
83                 error = -EINVAL;
84         return error;
85 }
86
87 void class_remove_file(struct class * cls, const struct class_attribute * attr)
88 {
89         if (cls)
90                 sysfs_remove_file(&cls->subsys.kobj, &attr->attr);
91 }
92
93 static struct class *class_get(struct class *cls)
94 {
95         if (cls)
96                 return container_of(kset_get(&cls->subsys), struct class, subsys);
97         return NULL;
98 }
99
100 static void class_put(struct class * cls)
101 {
102         if (cls)
103                 kset_put(&cls->subsys);
104 }
105
106
107 static int add_class_attrs(struct class * cls)
108 {
109         int i;
110         int error = 0;
111
112         if (cls->class_attrs) {
113                 for (i = 0; attr_name(cls->class_attrs[i]); i++) {
114                         error = class_create_file(cls,&cls->class_attrs[i]);
115                         if (error)
116                                 goto Err;
117                 }
118         }
119  Done:
120         return error;
121  Err:
122         while (--i >= 0)
123                 class_remove_file(cls,&cls->class_attrs[i]);
124         goto Done;
125 }
126
127 static void remove_class_attrs(struct class * cls)
128 {
129         int i;
130
131         if (cls->class_attrs) {
132                 for (i = 0; attr_name(cls->class_attrs[i]); i++)
133                         class_remove_file(cls,&cls->class_attrs[i]);
134         }
135 }
136
137 int class_register(struct class * cls)
138 {
139         int error;
140
141         pr_debug("device class '%s': registering\n", cls->name);
142
143         INIT_LIST_HEAD(&cls->children);
144         INIT_LIST_HEAD(&cls->devices);
145         INIT_LIST_HEAD(&cls->interfaces);
146         kset_init(&cls->class_dirs);
147         init_MUTEX(&cls->sem);
148         error = kobject_set_name(&cls->subsys.kobj, "%s", cls->name);
149         if (error)
150                 return error;
151
152         cls->subsys.kobj.kset = &class_subsys;
153
154         error = subsystem_register(&cls->subsys);
155         if (!error) {
156                 error = add_class_attrs(class_get(cls));
157                 class_put(cls);
158         }
159         return error;
160 }
161
162 void class_unregister(struct class * cls)
163 {
164         pr_debug("device class '%s': unregistering\n", cls->name);
165         remove_class_attrs(cls);
166         subsystem_unregister(&cls->subsys);
167 }
168
169 static void class_create_release(struct class *cls)
170 {
171         pr_debug("%s called for %s\n", __FUNCTION__, cls->name);
172         kfree(cls);
173 }
174
175 static void class_device_create_release(struct class_device *class_dev)
176 {
177         pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id);
178         kfree(class_dev);
179 }
180
181 /* needed to allow these devices to have parent class devices */
182 static int class_device_create_uevent(struct class_device *class_dev,
183                                       struct kobj_uevent_env *env)
184 {
185         pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id);
186         return 0;
187 }
188
189 /**
190  * class_create - create a struct class structure
191  * @owner: pointer to the module that is to "own" this struct class
192  * @name: pointer to a string for the name of this class.
193  *
194  * This is used to create a struct class pointer that can then be used
195  * in calls to class_device_create().
196  *
197  * Note, the pointer created here is to be destroyed when finished by
198  * making a call to class_destroy().
199  */
200 struct class *class_create(struct module *owner, const char *name)
201 {
202         struct class *cls;
203         int retval;
204
205         cls = kzalloc(sizeof(*cls), GFP_KERNEL);
206         if (!cls) {
207                 retval = -ENOMEM;
208                 goto error;
209         }
210
211         cls->name = name;
212         cls->owner = owner;
213         cls->class_release = class_create_release;
214         cls->release = class_device_create_release;
215
216         retval = class_register(cls);
217         if (retval)
218                 goto error;
219
220         return cls;
221
222 error:
223         kfree(cls);
224         return ERR_PTR(retval);
225 }
226
227 /**
228  * class_destroy - destroys a struct class structure
229  * @cls: pointer to the struct class that is to be destroyed
230  *
231  * Note, the pointer to be destroyed must have been created with a call
232  * to class_create().
233  */
234 void class_destroy(struct class *cls)
235 {
236         if ((cls == NULL) || (IS_ERR(cls)))
237                 return;
238
239         class_unregister(cls);
240 }
241
242 /* Class Device Stuff */
243
244 int class_device_create_file(struct class_device * class_dev,
245                              const struct class_device_attribute * attr)
246 {
247         int error = -EINVAL;
248         if (class_dev)
249                 error = sysfs_create_file(&class_dev->kobj, &attr->attr);
250         return error;
251 }
252
253 void class_device_remove_file(struct class_device * class_dev,
254                               const struct class_device_attribute * attr)
255 {
256         if (class_dev)
257                 sysfs_remove_file(&class_dev->kobj, &attr->attr);
258 }
259
260 static ssize_t
261 class_device_attr_show(struct kobject * kobj, struct attribute * attr,
262                        char * buf)
263 {
264         struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
265         struct class_device * cd = to_class_dev(kobj);
266         ssize_t ret = 0;
267
268         if (class_dev_attr->show)
269                 ret = class_dev_attr->show(cd, buf);
270         return ret;
271 }
272
273 static ssize_t
274 class_device_attr_store(struct kobject * kobj, struct attribute * attr,
275                         const char * buf, size_t count)
276 {
277         struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
278         struct class_device * cd = to_class_dev(kobj);
279         ssize_t ret = 0;
280
281         if (class_dev_attr->store)
282                 ret = class_dev_attr->store(cd, buf, count);
283         return ret;
284 }
285
286 static struct sysfs_ops class_dev_sysfs_ops = {
287         .show   = class_device_attr_show,
288         .store  = class_device_attr_store,
289 };
290
291 static void class_dev_release(struct kobject * kobj)
292 {
293         struct class_device *cd = to_class_dev(kobj);
294         struct class * cls = cd->class;
295
296         pr_debug("device class '%s': release.\n", cd->class_id);
297
298         if (cd->release)
299                 cd->release(cd);
300         else if (cls->release)
301                 cls->release(cd);
302         else {
303                 printk(KERN_ERR "Class Device '%s' does not have a release() function, "
304                         "it is broken and must be fixed.\n",
305                         cd->class_id);
306                 WARN_ON(1);
307         }
308 }
309
310 static struct kobj_type class_device_ktype = {
311         .sysfs_ops      = &class_dev_sysfs_ops,
312         .release        = class_dev_release,
313 };
314
315 static int class_uevent_filter(struct kset *kset, struct kobject *kobj)
316 {
317         struct kobj_type *ktype = get_ktype(kobj);
318
319         if (ktype == &class_device_ktype) {
320                 struct class_device *class_dev = to_class_dev(kobj);
321                 if (class_dev->class)
322                         return 1;
323         }
324         return 0;
325 }
326
327 static const char *class_uevent_name(struct kset *kset, struct kobject *kobj)
328 {
329         struct class_device *class_dev = to_class_dev(kobj);
330
331         return class_dev->class->name;
332 }
333
334 #ifdef CONFIG_SYSFS_DEPRECATED
335 char *make_class_name(const char *name, struct kobject *kobj)
336 {
337         char *class_name;
338         int size;
339
340         size = strlen(name) + strlen(kobject_name(kobj)) + 2;
341
342         class_name = kmalloc(size, GFP_KERNEL);
343         if (!class_name)
344                 return NULL;
345
346         strcpy(class_name, name);
347         strcat(class_name, ":");
348         strcat(class_name, kobject_name(kobj));
349         return class_name;
350 }
351
352 static int make_deprecated_class_device_links(struct class_device *class_dev)
353 {
354         char *class_name;
355         int error;
356
357         if (!class_dev->dev)
358                 return 0;
359
360         class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
361         if (class_name)
362                 error = sysfs_create_link(&class_dev->dev->kobj,
363                                           &class_dev->kobj, class_name);
364         else
365                 error = -ENOMEM;
366         kfree(class_name);
367         return error;
368 }
369
370 static void remove_deprecated_class_device_links(struct class_device *class_dev)
371 {
372         char *class_name;
373
374         if (!class_dev->dev)
375                 return;
376
377         class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
378         if (class_name)
379                 sysfs_remove_link(&class_dev->dev->kobj, class_name);
380         kfree(class_name);
381 }
382 #else
383 static inline int make_deprecated_class_device_links(struct class_device *cd)
384 { return 0; }
385 static void remove_deprecated_class_device_links(struct class_device *cd)
386 { }
387 #endif
388
389 static int class_uevent(struct kset *kset, struct kobject *kobj,
390                         struct kobj_uevent_env *env)
391 {
392         struct class_device *class_dev = to_class_dev(kobj);
393         struct device *dev = class_dev->dev;
394         int retval = 0;
395
396         pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id);
397
398         if (MAJOR(class_dev->devt)) {
399                 add_uevent_var(env, "MAJOR=%u", MAJOR(class_dev->devt));
400
401                 add_uevent_var(env, "MINOR=%u", MINOR(class_dev->devt));
402         }
403
404         if (dev) {
405                 const char *path = kobject_get_path(&dev->kobj, GFP_KERNEL);
406                 if (path) {
407                         add_uevent_var(env, "PHYSDEVPATH=%s", path);
408                         kfree(path);
409                 }
410
411                 if (dev->bus)
412                         add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name);
413
414                 if (dev->driver)
415                         add_uevent_var(env, "PHYSDEVDRIVER=%s", dev->driver->name);
416         }
417
418         if (class_dev->uevent) {
419                 /* have the class device specific function add its stuff */
420                 retval = class_dev->uevent(class_dev, env);
421                 if (retval)
422                         pr_debug("class_dev->uevent() returned %d\n", retval);
423         } else if (class_dev->class->uevent) {
424                 /* have the class specific function add its stuff */
425                 retval = class_dev->class->uevent(class_dev, env);
426                 if (retval)
427                         pr_debug("class->uevent() returned %d\n", retval);
428         }
429
430         return retval;
431 }
432
433 static struct kset_uevent_ops class_uevent_ops = {
434         .filter =       class_uevent_filter,
435         .name =         class_uevent_name,
436         .uevent =       class_uevent,
437 };
438
439 static decl_subsys(class_obj, &class_device_ktype, &class_uevent_ops);
440
441
442 static int class_device_add_attrs(struct class_device * cd)
443 {
444         int i;
445         int error = 0;
446         struct class * cls = cd->class;
447
448         if (cls->class_dev_attrs) {
449                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) {
450                         error = class_device_create_file(cd,
451                                                          &cls->class_dev_attrs[i]);
452                         if (error)
453                                 goto Err;
454                 }
455         }
456  Done:
457         return error;
458  Err:
459         while (--i >= 0)
460                 class_device_remove_file(cd,&cls->class_dev_attrs[i]);
461         goto Done;
462 }
463
464 static void class_device_remove_attrs(struct class_device * cd)
465 {
466         int i;
467         struct class * cls = cd->class;
468
469         if (cls->class_dev_attrs) {
470                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++)
471                         class_device_remove_file(cd,&cls->class_dev_attrs[i]);
472         }
473 }
474
475 static int class_device_add_groups(struct class_device * cd)
476 {
477         int i;
478         int error = 0;
479
480         if (cd->groups) {
481                 for (i = 0; cd->groups[i]; i++) {
482                         error = sysfs_create_group(&cd->kobj, cd->groups[i]);
483                         if (error) {
484                                 while (--i >= 0)
485                                         sysfs_remove_group(&cd->kobj, cd->groups[i]);
486                                 goto out;
487                         }
488                 }
489         }
490 out:
491         return error;
492 }
493
494 static void class_device_remove_groups(struct class_device * cd)
495 {
496         int i;
497         if (cd->groups) {
498                 for (i = 0; cd->groups[i]; i++) {
499                         sysfs_remove_group(&cd->kobj, cd->groups[i]);
500                 }
501         }
502 }
503
504 static ssize_t show_dev(struct class_device *class_dev, char *buf)
505 {
506         return print_dev_t(buf, class_dev->devt);
507 }
508
509 static struct class_device_attribute class_devt_attr =
510         __ATTR(dev, S_IRUGO, show_dev, NULL);
511
512 static ssize_t store_uevent(struct class_device *class_dev,
513                             const char *buf, size_t count)
514 {
515         kobject_uevent(&class_dev->kobj, KOBJ_ADD);
516         return count;
517 }
518
519 static struct class_device_attribute class_uevent_attr =
520         __ATTR(uevent, S_IWUSR, NULL, store_uevent);
521
522 void class_device_initialize(struct class_device *class_dev)
523 {
524         kobj_set_kset_s(class_dev, class_obj_subsys);
525         kobject_init(&class_dev->kobj);
526         INIT_LIST_HEAD(&class_dev->node);
527 }
528
529 int class_device_add(struct class_device *class_dev)
530 {
531         struct class *parent_class = NULL;
532         struct class_device *parent_class_dev = NULL;
533         struct class_interface *class_intf;
534         int error = -EINVAL;
535
536         class_dev = class_device_get(class_dev);
537         if (!class_dev)
538                 return -EINVAL;
539
540         if (!strlen(class_dev->class_id))
541                 goto out1;
542
543         parent_class = class_get(class_dev->class);
544         if (!parent_class)
545                 goto out1;
546
547         parent_class_dev = class_device_get(class_dev->parent);
548
549         pr_debug("CLASS: registering class device: ID = '%s'\n",
550                  class_dev->class_id);
551
552         /* first, register with generic layer. */
553         error = kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
554         if (error)
555                 goto out2;
556
557         if (parent_class_dev)
558                 class_dev->kobj.parent = &parent_class_dev->kobj;
559         else
560                 class_dev->kobj.parent = &parent_class->subsys.kobj;
561
562         error = kobject_add(&class_dev->kobj);
563         if (error)
564                 goto out2;
565
566         /* add the needed attributes to this device */
567         error = sysfs_create_link(&class_dev->kobj,
568                                   &parent_class->subsys.kobj, "subsystem");
569         if (error)
570                 goto out3;
571
572         error = class_device_create_file(class_dev, &class_uevent_attr);
573         if (error)
574                 goto out3;
575
576         if (MAJOR(class_dev->devt)) {
577                 error = class_device_create_file(class_dev, &class_devt_attr);
578                 if (error)
579                         goto out4;
580         }
581
582         error = class_device_add_attrs(class_dev);
583         if (error)
584                 goto out5;
585
586         if (class_dev->dev) {
587                 error = sysfs_create_link(&class_dev->kobj,
588                                           &class_dev->dev->kobj, "device");
589                 if (error)
590                         goto out6;
591         }
592
593         error = class_device_add_groups(class_dev);
594         if (error)
595                 goto out7;
596
597         error = make_deprecated_class_device_links(class_dev);
598         if (error)
599                 goto out8;
600
601         kobject_uevent(&class_dev->kobj, KOBJ_ADD);
602
603         /* notify any interfaces this device is now here */
604         down(&parent_class->sem);
605         list_add_tail(&class_dev->node, &parent_class->children);
606         list_for_each_entry(class_intf, &parent_class->interfaces, node) {
607                 if (class_intf->add)
608                         class_intf->add(class_dev, class_intf);
609         }
610         up(&parent_class->sem);
611
612         goto out1;
613
614  out8:
615         class_device_remove_groups(class_dev);
616  out7:
617         if (class_dev->dev)
618                 sysfs_remove_link(&class_dev->kobj, "device");
619  out6:
620         class_device_remove_attrs(class_dev);
621  out5:
622         if (MAJOR(class_dev->devt))
623                 class_device_remove_file(class_dev, &class_devt_attr);
624  out4:
625         class_device_remove_file(class_dev, &class_uevent_attr);
626  out3:
627         kobject_del(&class_dev->kobj);
628  out2:
629         if(parent_class_dev)
630                 class_device_put(parent_class_dev);
631         class_put(parent_class);
632  out1:
633         class_device_put(class_dev);
634         return error;
635 }
636
637 int class_device_register(struct class_device *class_dev)
638 {
639         class_device_initialize(class_dev);
640         return class_device_add(class_dev);
641 }
642
643 /**
644  * class_device_create - creates a class device and registers it with sysfs
645  * @cls: pointer to the struct class that this device should be registered to.
646  * @parent: pointer to the parent struct class_device of this new device, if any.
647  * @devt: the dev_t for the char device to be added.
648  * @device: a pointer to a struct device that is assiociated with this class device.
649  * @fmt: string for the class device's name
650  *
651  * This function can be used by char device classes.  A struct
652  * class_device will be created in sysfs, registered to the specified
653  * class.
654  * A "dev" file will be created, showing the dev_t for the device, if
655  * the dev_t is not 0,0.
656  * If a pointer to a parent struct class_device is passed in, the newly
657  * created struct class_device will be a child of that device in sysfs.
658  * The pointer to the struct class_device will be returned from the
659  * call.  Any further sysfs files that might be required can be created
660  * using this pointer.
661  *
662  * Note: the struct class passed to this function must have previously
663  * been created with a call to class_create().
664  */
665 struct class_device *class_device_create(struct class *cls,
666                                          struct class_device *parent,
667                                          dev_t devt,
668                                          struct device *device,
669                                          const char *fmt, ...)
670 {
671         va_list args;
672         struct class_device *class_dev = NULL;
673         int retval = -ENODEV;
674
675         if (cls == NULL || IS_ERR(cls))
676                 goto error;
677
678         class_dev = kzalloc(sizeof(*class_dev), GFP_KERNEL);
679         if (!class_dev) {
680                 retval = -ENOMEM;
681                 goto error;
682         }
683
684         class_dev->devt = devt;
685         class_dev->dev = device;
686         class_dev->class = cls;
687         class_dev->parent = parent;
688         class_dev->release = class_device_create_release;
689         class_dev->uevent = class_device_create_uevent;
690
691         va_start(args, fmt);
692         vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args);
693         va_end(args);
694         retval = class_device_register(class_dev);
695         if (retval)
696                 goto error;
697
698         return class_dev;
699
700 error:
701         kfree(class_dev);
702         return ERR_PTR(retval);
703 }
704
705 void class_device_del(struct class_device *class_dev)
706 {
707         struct class *parent_class = class_dev->class;
708         struct class_device *parent_device = class_dev->parent;
709         struct class_interface *class_intf;
710
711         if (parent_class) {
712                 down(&parent_class->sem);
713                 list_del_init(&class_dev->node);
714                 list_for_each_entry(class_intf, &parent_class->interfaces, node)
715                         if (class_intf->remove)
716                                 class_intf->remove(class_dev, class_intf);
717                 up(&parent_class->sem);
718         }
719
720         if (class_dev->dev) {
721                 remove_deprecated_class_device_links(class_dev);
722                 sysfs_remove_link(&class_dev->kobj, "device");
723         }
724         sysfs_remove_link(&class_dev->kobj, "subsystem");
725         class_device_remove_file(class_dev, &class_uevent_attr);
726         if (MAJOR(class_dev->devt))
727                 class_device_remove_file(class_dev, &class_devt_attr);
728         class_device_remove_attrs(class_dev);
729         class_device_remove_groups(class_dev);
730
731         kobject_uevent(&class_dev->kobj, KOBJ_REMOVE);
732         kobject_del(&class_dev->kobj);
733
734         class_device_put(parent_device);
735         class_put(parent_class);
736 }
737
738 void class_device_unregister(struct class_device *class_dev)
739 {
740         pr_debug("CLASS: Unregistering class device. ID = '%s'\n",
741                  class_dev->class_id);
742         class_device_del(class_dev);
743         class_device_put(class_dev);
744 }
745
746 /**
747  * class_device_destroy - removes a class device that was created with class_device_create()
748  * @cls: the pointer to the struct class that this device was registered * with.
749  * @devt: the dev_t of the device that was previously registered.
750  *
751  * This call unregisters and cleans up a class device that was created with a
752  * call to class_device_create()
753  */
754 void class_device_destroy(struct class *cls, dev_t devt)
755 {
756         struct class_device *class_dev = NULL;
757         struct class_device *class_dev_tmp;
758
759         down(&cls->sem);
760         list_for_each_entry(class_dev_tmp, &cls->children, node) {
761                 if (class_dev_tmp->devt == devt) {
762                         class_dev = class_dev_tmp;
763                         break;
764                 }
765         }
766         up(&cls->sem);
767
768         if (class_dev)
769                 class_device_unregister(class_dev);
770 }
771
772 struct class_device * class_device_get(struct class_device *class_dev)
773 {
774         if (class_dev)
775                 return to_class_dev(kobject_get(&class_dev->kobj));
776         return NULL;
777 }
778
779 void class_device_put(struct class_device *class_dev)
780 {
781         if (class_dev)
782                 kobject_put(&class_dev->kobj);
783 }
784
785
786 int class_interface_register(struct class_interface *class_intf)
787 {
788         struct class *parent;
789         struct class_device *class_dev;
790         struct device *dev;
791
792         if (!class_intf || !class_intf->class)
793                 return -ENODEV;
794
795         parent = class_get(class_intf->class);
796         if (!parent)
797                 return -EINVAL;
798
799         down(&parent->sem);
800         list_add_tail(&class_intf->node, &parent->interfaces);
801         if (class_intf->add) {
802                 list_for_each_entry(class_dev, &parent->children, node)
803                         class_intf->add(class_dev, class_intf);
804         }
805         if (class_intf->add_dev) {
806                 list_for_each_entry(dev, &parent->devices, node)
807                         class_intf->add_dev(dev, class_intf);
808         }
809         up(&parent->sem);
810
811         return 0;
812 }
813
814 void class_interface_unregister(struct class_interface *class_intf)
815 {
816         struct class * parent = class_intf->class;
817         struct class_device *class_dev;
818         struct device *dev;
819
820         if (!parent)
821                 return;
822
823         down(&parent->sem);
824         list_del_init(&class_intf->node);
825         if (class_intf->remove) {
826                 list_for_each_entry(class_dev, &parent->children, node)
827                         class_intf->remove(class_dev, class_intf);
828         }
829         if (class_intf->remove_dev) {
830                 list_for_each_entry(dev, &parent->devices, node)
831                         class_intf->remove_dev(dev, class_intf);
832         }
833         up(&parent->sem);
834
835         class_put(parent);
836 }
837
838 int __init classes_init(void)
839 {
840         int retval;
841
842         retval = subsystem_register(&class_subsys);
843         if (retval)
844                 return retval;
845
846         /* ick, this is ugly, the things we go through to keep from showing up
847          * in sysfs... */
848         kset_init(&class_obj_subsys);
849         if (!class_obj_subsys.kobj.parent)
850                 class_obj_subsys.kobj.parent = &class_obj_subsys.kobj;
851         return 0;
852 }
853
854 EXPORT_SYMBOL_GPL(class_create_file);
855 EXPORT_SYMBOL_GPL(class_remove_file);
856 EXPORT_SYMBOL_GPL(class_register);
857 EXPORT_SYMBOL_GPL(class_unregister);
858 EXPORT_SYMBOL_GPL(class_create);
859 EXPORT_SYMBOL_GPL(class_destroy);
860
861 EXPORT_SYMBOL_GPL(class_device_register);
862 EXPORT_SYMBOL_GPL(class_device_unregister);
863 EXPORT_SYMBOL_GPL(class_device_initialize);
864 EXPORT_SYMBOL_GPL(class_device_add);
865 EXPORT_SYMBOL_GPL(class_device_del);
866 EXPORT_SYMBOL_GPL(class_device_get);
867 EXPORT_SYMBOL_GPL(class_device_put);
868 EXPORT_SYMBOL_GPL(class_device_create);
869 EXPORT_SYMBOL_GPL(class_device_destroy);
870 EXPORT_SYMBOL_GPL(class_device_create_file);
871 EXPORT_SYMBOL_GPL(class_device_remove_file);
872
873 EXPORT_SYMBOL_GPL(class_interface_register);
874 EXPORT_SYMBOL_GPL(class_interface_unregister);