parport_pc: it887x fix
[linux-2.6] / 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 ktype_class = {
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, &ktype_class, 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(subsys_get(&cls->subsys), struct class, subsys);
97         return NULL;
98 }
99
100 static void class_put(struct class * cls)
101 {
102         if (cls)
103                 subsys_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         subsys_set_kset(cls, 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                                        char **envp, int num_envp,
184                                        char *buffer, int buffer_size)
185 {
186         pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id);
187         return 0;
188 }
189
190 /**
191  * class_create - create a struct class structure
192  * @owner: pointer to the module that is to "own" this struct class
193  * @name: pointer to a string for the name of this class.
194  *
195  * This is used to create a struct class pointer that can then be used
196  * in calls to class_device_create().
197  *
198  * Note, the pointer created here is to be destroyed when finished by
199  * making a call to class_destroy().
200  */
201 struct class *class_create(struct module *owner, const char *name)
202 {
203         struct class *cls;
204         int retval;
205
206         cls = kzalloc(sizeof(*cls), GFP_KERNEL);
207         if (!cls) {
208                 retval = -ENOMEM;
209                 goto error;
210         }
211
212         cls->name = name;
213         cls->owner = owner;
214         cls->class_release = class_create_release;
215         cls->release = class_device_create_release;
216
217         retval = class_register(cls);
218         if (retval)
219                 goto error;
220
221         return cls;
222
223 error:
224         kfree(cls);
225         return ERR_PTR(retval);
226 }
227
228 /**
229  * class_destroy - destroys a struct class structure
230  * @cls: pointer to the struct class that is to be destroyed
231  *
232  * Note, the pointer to be destroyed must have been created with a call
233  * to class_create().
234  */
235 void class_destroy(struct class *cls)
236 {
237         if ((cls == NULL) || (IS_ERR(cls)))
238                 return;
239
240         class_unregister(cls);
241 }
242
243 /* Class Device Stuff */
244
245 int class_device_create_file(struct class_device * class_dev,
246                              const struct class_device_attribute * attr)
247 {
248         int error = -EINVAL;
249         if (class_dev)
250                 error = sysfs_create_file(&class_dev->kobj, &attr->attr);
251         return error;
252 }
253
254 void class_device_remove_file(struct class_device * class_dev,
255                               const struct class_device_attribute * attr)
256 {
257         if (class_dev)
258                 sysfs_remove_file(&class_dev->kobj, &attr->attr);
259 }
260
261 int class_device_create_bin_file(struct class_device *class_dev,
262                                  struct bin_attribute *attr)
263 {
264         int error = -EINVAL;
265         if (class_dev)
266                 error = sysfs_create_bin_file(&class_dev->kobj, attr);
267         return error;
268 }
269
270 void class_device_remove_bin_file(struct class_device *class_dev,
271                                   struct bin_attribute *attr)
272 {
273         if (class_dev)
274                 sysfs_remove_bin_file(&class_dev->kobj, attr);
275 }
276
277 static ssize_t
278 class_device_attr_show(struct kobject * kobj, struct attribute * attr,
279                        char * buf)
280 {
281         struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
282         struct class_device * cd = to_class_dev(kobj);
283         ssize_t ret = 0;
284
285         if (class_dev_attr->show)
286                 ret = class_dev_attr->show(cd, buf);
287         return ret;
288 }
289
290 static ssize_t
291 class_device_attr_store(struct kobject * kobj, struct attribute * attr,
292                         const char * buf, size_t count)
293 {
294         struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
295         struct class_device * cd = to_class_dev(kobj);
296         ssize_t ret = 0;
297
298         if (class_dev_attr->store)
299                 ret = class_dev_attr->store(cd, buf, count);
300         return ret;
301 }
302
303 static struct sysfs_ops class_dev_sysfs_ops = {
304         .show   = class_device_attr_show,
305         .store  = class_device_attr_store,
306 };
307
308 static void class_dev_release(struct kobject * kobj)
309 {
310         struct class_device *cd = to_class_dev(kobj);
311         struct class * cls = cd->class;
312
313         pr_debug("device class '%s': release.\n", cd->class_id);
314
315         if (cd->release)
316                 cd->release(cd);
317         else if (cls->release)
318                 cls->release(cd);
319         else {
320                 printk(KERN_ERR "Class Device '%s' does not have a release() function, "
321                         "it is broken and must be fixed.\n",
322                         cd->class_id);
323                 WARN_ON(1);
324         }
325 }
326
327 static struct kobj_type ktype_class_device = {
328         .sysfs_ops      = &class_dev_sysfs_ops,
329         .release        = class_dev_release,
330 };
331
332 static int class_uevent_filter(struct kset *kset, struct kobject *kobj)
333 {
334         struct kobj_type *ktype = get_ktype(kobj);
335
336         if (ktype == &ktype_class_device) {
337                 struct class_device *class_dev = to_class_dev(kobj);
338                 if (class_dev->class)
339                         return 1;
340         }
341         return 0;
342 }
343
344 static const char *class_uevent_name(struct kset *kset, struct kobject *kobj)
345 {
346         struct class_device *class_dev = to_class_dev(kobj);
347
348         return class_dev->class->name;
349 }
350
351 #ifdef CONFIG_SYSFS_DEPRECATED
352 char *make_class_name(const char *name, struct kobject *kobj)
353 {
354         char *class_name;
355         int size;
356
357         size = strlen(name) + strlen(kobject_name(kobj)) + 2;
358
359         class_name = kmalloc(size, GFP_KERNEL);
360         if (!class_name)
361                 return NULL;
362
363         strcpy(class_name, name);
364         strcat(class_name, ":");
365         strcat(class_name, kobject_name(kobj));
366         return class_name;
367 }
368
369 static int make_deprecated_class_device_links(struct class_device *class_dev)
370 {
371         char *class_name;
372         int error;
373
374         if (!class_dev->dev)
375                 return 0;
376
377         class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
378         if (class_name)
379                 error = sysfs_create_link(&class_dev->dev->kobj,
380                                           &class_dev->kobj, class_name);
381         else
382                 error = -ENOMEM;
383         kfree(class_name);
384         return error;
385 }
386
387 static void remove_deprecated_class_device_links(struct class_device *class_dev)
388 {
389         char *class_name;
390
391         if (!class_dev->dev)
392                 return;
393
394         class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
395         if (class_name)
396                 sysfs_remove_link(&class_dev->dev->kobj, class_name);
397         kfree(class_name);
398 }
399 #else
400 static inline int make_deprecated_class_device_links(struct class_device *cd)
401 { return 0; }
402 static void remove_deprecated_class_device_links(struct class_device *cd)
403 { }
404 #endif
405
406 static int class_uevent(struct kset *kset, struct kobject *kobj, char **envp,
407                          int num_envp, char *buffer, int buffer_size)
408 {
409         struct class_device *class_dev = to_class_dev(kobj);
410         struct device *dev = class_dev->dev;
411         int i = 0;
412         int length = 0;
413         int retval = 0;
414
415         pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id);
416
417         if (MAJOR(class_dev->devt)) {
418                 add_uevent_var(envp, num_envp, &i,
419                                buffer, buffer_size, &length,
420                                "MAJOR=%u", MAJOR(class_dev->devt));
421
422                 add_uevent_var(envp, num_envp, &i,
423                                buffer, buffer_size, &length,
424                                "MINOR=%u", MINOR(class_dev->devt));
425         }
426
427         if (dev) {
428                 const char *path = kobject_get_path(&dev->kobj, GFP_KERNEL);
429                 if (path) {
430                         add_uevent_var(envp, num_envp, &i,
431                                        buffer, buffer_size, &length,
432                                        "PHYSDEVPATH=%s", path);
433                         kfree(path);
434                 }
435
436                 if (dev->bus)
437                         add_uevent_var(envp, num_envp, &i,
438                                        buffer, buffer_size, &length,
439                                        "PHYSDEVBUS=%s", dev->bus->name);
440
441                 if (dev->driver)
442                         add_uevent_var(envp, num_envp, &i,
443                                        buffer, buffer_size, &length,
444                                        "PHYSDEVDRIVER=%s", dev->driver->name);
445         }
446
447         /* terminate, set to next free slot, shrink available space */
448         envp[i] = NULL;
449         envp = &envp[i];
450         num_envp -= i;
451         buffer = &buffer[length];
452         buffer_size -= length;
453
454         if (class_dev->uevent) {
455                 /* have the class device specific function add its stuff */
456                 retval = class_dev->uevent(class_dev, envp, num_envp,
457                                             buffer, buffer_size);
458                 if (retval)
459                         pr_debug("class_dev->uevent() returned %d\n", retval);
460         } else if (class_dev->class->uevent) {
461                 /* have the class specific function add its stuff */
462                 retval = class_dev->class->uevent(class_dev, envp, num_envp,
463                                                    buffer, buffer_size);
464                 if (retval)
465                         pr_debug("class->uevent() returned %d\n", retval);
466         }
467
468         return retval;
469 }
470
471 static struct kset_uevent_ops class_uevent_ops = {
472         .filter =       class_uevent_filter,
473         .name =         class_uevent_name,
474         .uevent =       class_uevent,
475 };
476
477 static decl_subsys(class_obj, &ktype_class_device, &class_uevent_ops);
478
479
480 static int class_device_add_attrs(struct class_device * cd)
481 {
482         int i;
483         int error = 0;
484         struct class * cls = cd->class;
485
486         if (cls->class_dev_attrs) {
487                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) {
488                         error = class_device_create_file(cd,
489                                                          &cls->class_dev_attrs[i]);
490                         if (error)
491                                 goto Err;
492                 }
493         }
494  Done:
495         return error;
496  Err:
497         while (--i >= 0)
498                 class_device_remove_file(cd,&cls->class_dev_attrs[i]);
499         goto Done;
500 }
501
502 static void class_device_remove_attrs(struct class_device * cd)
503 {
504         int i;
505         struct class * cls = cd->class;
506
507         if (cls->class_dev_attrs) {
508                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++)
509                         class_device_remove_file(cd,&cls->class_dev_attrs[i]);
510         }
511 }
512
513 static int class_device_add_groups(struct class_device * cd)
514 {
515         int i;
516         int error = 0;
517
518         if (cd->groups) {
519                 for (i = 0; cd->groups[i]; i++) {
520                         error = sysfs_create_group(&cd->kobj, cd->groups[i]);
521                         if (error) {
522                                 while (--i >= 0)
523                                         sysfs_remove_group(&cd->kobj, cd->groups[i]);
524                                 goto out;
525                         }
526                 }
527         }
528 out:
529         return error;
530 }
531
532 static void class_device_remove_groups(struct class_device * cd)
533 {
534         int i;
535         if (cd->groups) {
536                 for (i = 0; cd->groups[i]; i++) {
537                         sysfs_remove_group(&cd->kobj, cd->groups[i]);
538                 }
539         }
540 }
541
542 static ssize_t show_dev(struct class_device *class_dev, char *buf)
543 {
544         return print_dev_t(buf, class_dev->devt);
545 }
546
547 static struct class_device_attribute class_devt_attr =
548         __ATTR(dev, S_IRUGO, show_dev, NULL);
549
550 static ssize_t store_uevent(struct class_device *class_dev,
551                             const char *buf, size_t count)
552 {
553         kobject_uevent(&class_dev->kobj, KOBJ_ADD);
554         return count;
555 }
556
557 static struct class_device_attribute class_uevent_attr =
558         __ATTR(uevent, S_IWUSR, NULL, store_uevent);
559
560 void class_device_initialize(struct class_device *class_dev)
561 {
562         kobj_set_kset_s(class_dev, class_obj_subsys);
563         kobject_init(&class_dev->kobj);
564         INIT_LIST_HEAD(&class_dev->node);
565 }
566
567 int class_device_add(struct class_device *class_dev)
568 {
569         struct class *parent_class = NULL;
570         struct class_device *parent_class_dev = NULL;
571         struct class_interface *class_intf;
572         int error = -EINVAL;
573
574         class_dev = class_device_get(class_dev);
575         if (!class_dev)
576                 return -EINVAL;
577
578         if (!strlen(class_dev->class_id))
579                 goto out1;
580
581         parent_class = class_get(class_dev->class);
582         if (!parent_class)
583                 goto out1;
584
585         parent_class_dev = class_device_get(class_dev->parent);
586
587         pr_debug("CLASS: registering class device: ID = '%s'\n",
588                  class_dev->class_id);
589
590         /* first, register with generic layer. */
591         error = kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
592         if (error)
593                 goto out2;
594
595         if (parent_class_dev)
596                 class_dev->kobj.parent = &parent_class_dev->kobj;
597         else
598                 class_dev->kobj.parent = &parent_class->subsys.kobj;
599
600         error = kobject_add(&class_dev->kobj);
601         if (error)
602                 goto out2;
603
604         /* add the needed attributes to this device */
605         error = sysfs_create_link(&class_dev->kobj,
606                                   &parent_class->subsys.kobj, "subsystem");
607         if (error)
608                 goto out3;
609
610         error = class_device_create_file(class_dev, &class_uevent_attr);
611         if (error)
612                 goto out3;
613
614         if (MAJOR(class_dev->devt)) {
615                 error = class_device_create_file(class_dev, &class_devt_attr);
616                 if (error)
617                         goto out4;
618         }
619
620         error = class_device_add_attrs(class_dev);
621         if (error)
622                 goto out5;
623
624         if (class_dev->dev) {
625                 error = sysfs_create_link(&class_dev->kobj,
626                                           &class_dev->dev->kobj, "device");
627                 if (error)
628                         goto out6;
629         }
630
631         error = class_device_add_groups(class_dev);
632         if (error)
633                 goto out7;
634
635         error = make_deprecated_class_device_links(class_dev);
636         if (error)
637                 goto out8;
638
639         kobject_uevent(&class_dev->kobj, KOBJ_ADD);
640
641         /* notify any interfaces this device is now here */
642         down(&parent_class->sem);
643         list_add_tail(&class_dev->node, &parent_class->children);
644         list_for_each_entry(class_intf, &parent_class->interfaces, node) {
645                 if (class_intf->add)
646                         class_intf->add(class_dev, class_intf);
647         }
648         up(&parent_class->sem);
649
650         goto out1;
651
652  out8:
653         class_device_remove_groups(class_dev);
654  out7:
655         if (class_dev->dev)
656                 sysfs_remove_link(&class_dev->kobj, "device");
657  out6:
658         class_device_remove_attrs(class_dev);
659  out5:
660         if (MAJOR(class_dev->devt))
661                 class_device_remove_file(class_dev, &class_devt_attr);
662  out4:
663         class_device_remove_file(class_dev, &class_uevent_attr);
664  out3:
665         kobject_del(&class_dev->kobj);
666  out2:
667         if(parent_class_dev)
668                 class_device_put(parent_class_dev);
669         class_put(parent_class);
670  out1:
671         class_device_put(class_dev);
672         return error;
673 }
674
675 int class_device_register(struct class_device *class_dev)
676 {
677         class_device_initialize(class_dev);
678         return class_device_add(class_dev);
679 }
680
681 /**
682  * class_device_create - creates a class device and registers it with sysfs
683  * @cls: pointer to the struct class that this device should be registered to.
684  * @parent: pointer to the parent struct class_device of this new device, if any.
685  * @devt: the dev_t for the char device to be added.
686  * @device: a pointer to a struct device that is assiociated with this class device.
687  * @fmt: string for the class device's name
688  *
689  * This function can be used by char device classes.  A struct
690  * class_device will be created in sysfs, registered to the specified
691  * class.
692  * A "dev" file will be created, showing the dev_t for the device, if
693  * the dev_t is not 0,0.
694  * If a pointer to a parent struct class_device is passed in, the newly
695  * created struct class_device will be a child of that device in sysfs.
696  * The pointer to the struct class_device will be returned from the
697  * call.  Any further sysfs files that might be required can be created
698  * using this pointer.
699  *
700  * Note: the struct class passed to this function must have previously
701  * been created with a call to class_create().
702  */
703 struct class_device *class_device_create(struct class *cls,
704                                          struct class_device *parent,
705                                          dev_t devt,
706                                          struct device *device,
707                                          const char *fmt, ...)
708 {
709         va_list args;
710         struct class_device *class_dev = NULL;
711         int retval = -ENODEV;
712
713         if (cls == NULL || IS_ERR(cls))
714                 goto error;
715
716         class_dev = kzalloc(sizeof(*class_dev), GFP_KERNEL);
717         if (!class_dev) {
718                 retval = -ENOMEM;
719                 goto error;
720         }
721
722         class_dev->devt = devt;
723         class_dev->dev = device;
724         class_dev->class = cls;
725         class_dev->parent = parent;
726         class_dev->release = class_device_create_release;
727         class_dev->uevent = class_device_create_uevent;
728
729         va_start(args, fmt);
730         vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args);
731         va_end(args);
732         retval = class_device_register(class_dev);
733         if (retval)
734                 goto error;
735
736         return class_dev;
737
738 error:
739         kfree(class_dev);
740         return ERR_PTR(retval);
741 }
742
743 void class_device_del(struct class_device *class_dev)
744 {
745         struct class *parent_class = class_dev->class;
746         struct class_device *parent_device = class_dev->parent;
747         struct class_interface *class_intf;
748
749         if (parent_class) {
750                 down(&parent_class->sem);
751                 list_del_init(&class_dev->node);
752                 list_for_each_entry(class_intf, &parent_class->interfaces, node)
753                         if (class_intf->remove)
754                                 class_intf->remove(class_dev, class_intf);
755                 up(&parent_class->sem);
756         }
757
758         if (class_dev->dev) {
759                 remove_deprecated_class_device_links(class_dev);
760                 sysfs_remove_link(&class_dev->kobj, "device");
761         }
762         sysfs_remove_link(&class_dev->kobj, "subsystem");
763         class_device_remove_file(class_dev, &class_uevent_attr);
764         if (MAJOR(class_dev->devt))
765                 class_device_remove_file(class_dev, &class_devt_attr);
766         class_device_remove_attrs(class_dev);
767         class_device_remove_groups(class_dev);
768
769         kobject_uevent(&class_dev->kobj, KOBJ_REMOVE);
770         kobject_del(&class_dev->kobj);
771
772         class_device_put(parent_device);
773         class_put(parent_class);
774 }
775
776 void class_device_unregister(struct class_device *class_dev)
777 {
778         pr_debug("CLASS: Unregistering class device. ID = '%s'\n",
779                  class_dev->class_id);
780         class_device_del(class_dev);
781         class_device_put(class_dev);
782 }
783
784 /**
785  * class_device_destroy - removes a class device that was created with class_device_create()
786  * @cls: the pointer to the struct class that this device was registered * with.
787  * @devt: the dev_t of the device that was previously registered.
788  *
789  * This call unregisters and cleans up a class device that was created with a
790  * call to class_device_create()
791  */
792 void class_device_destroy(struct class *cls, dev_t devt)
793 {
794         struct class_device *class_dev = NULL;
795         struct class_device *class_dev_tmp;
796
797         down(&cls->sem);
798         list_for_each_entry(class_dev_tmp, &cls->children, node) {
799                 if (class_dev_tmp->devt == devt) {
800                         class_dev = class_dev_tmp;
801                         break;
802                 }
803         }
804         up(&cls->sem);
805
806         if (class_dev)
807                 class_device_unregister(class_dev);
808 }
809
810 struct class_device * class_device_get(struct class_device *class_dev)
811 {
812         if (class_dev)
813                 return to_class_dev(kobject_get(&class_dev->kobj));
814         return NULL;
815 }
816
817 void class_device_put(struct class_device *class_dev)
818 {
819         if (class_dev)
820                 kobject_put(&class_dev->kobj);
821 }
822
823
824 int class_interface_register(struct class_interface *class_intf)
825 {
826         struct class *parent;
827         struct class_device *class_dev;
828         struct device *dev;
829
830         if (!class_intf || !class_intf->class)
831                 return -ENODEV;
832
833         parent = class_get(class_intf->class);
834         if (!parent)
835                 return -EINVAL;
836
837         down(&parent->sem);
838         list_add_tail(&class_intf->node, &parent->interfaces);
839         if (class_intf->add) {
840                 list_for_each_entry(class_dev, &parent->children, node)
841                         class_intf->add(class_dev, class_intf);
842         }
843         if (class_intf->add_dev) {
844                 list_for_each_entry(dev, &parent->devices, node)
845                         class_intf->add_dev(dev, class_intf);
846         }
847         up(&parent->sem);
848
849         return 0;
850 }
851
852 void class_interface_unregister(struct class_interface *class_intf)
853 {
854         struct class * parent = class_intf->class;
855         struct class_device *class_dev;
856         struct device *dev;
857
858         if (!parent)
859                 return;
860
861         down(&parent->sem);
862         list_del_init(&class_intf->node);
863         if (class_intf->remove) {
864                 list_for_each_entry(class_dev, &parent->children, node)
865                         class_intf->remove(class_dev, class_intf);
866         }
867         if (class_intf->remove_dev) {
868                 list_for_each_entry(dev, &parent->devices, node)
869                         class_intf->remove_dev(dev, class_intf);
870         }
871         up(&parent->sem);
872
873         class_put(parent);
874 }
875
876 int __init classes_init(void)
877 {
878         int retval;
879
880         retval = subsystem_register(&class_subsys);
881         if (retval)
882                 return retval;
883
884         /* ick, this is ugly, the things we go through to keep from showing up
885          * in sysfs... */
886         subsystem_init(&class_obj_subsys);
887         if (!class_obj_subsys.kobj.parent)
888                 class_obj_subsys.kobj.parent = &class_obj_subsys.kobj;
889         return 0;
890 }
891
892 EXPORT_SYMBOL_GPL(class_create_file);
893 EXPORT_SYMBOL_GPL(class_remove_file);
894 EXPORT_SYMBOL_GPL(class_register);
895 EXPORT_SYMBOL_GPL(class_unregister);
896 EXPORT_SYMBOL_GPL(class_create);
897 EXPORT_SYMBOL_GPL(class_destroy);
898
899 EXPORT_SYMBOL_GPL(class_device_register);
900 EXPORT_SYMBOL_GPL(class_device_unregister);
901 EXPORT_SYMBOL_GPL(class_device_initialize);
902 EXPORT_SYMBOL_GPL(class_device_add);
903 EXPORT_SYMBOL_GPL(class_device_del);
904 EXPORT_SYMBOL_GPL(class_device_get);
905 EXPORT_SYMBOL_GPL(class_device_put);
906 EXPORT_SYMBOL_GPL(class_device_create);
907 EXPORT_SYMBOL_GPL(class_device_destroy);
908 EXPORT_SYMBOL_GPL(class_device_create_file);
909 EXPORT_SYMBOL_GPL(class_device_remove_file);
910 EXPORT_SYMBOL_GPL(class_device_create_bin_file);
911 EXPORT_SYMBOL_GPL(class_device_remove_bin_file);
912
913 EXPORT_SYMBOL_GPL(class_interface_register);
914 EXPORT_SYMBOL_GPL(class_interface_unregister);