remove "struct subsystem" as it is no longer needed
[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 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         kfree(cd->devt_attr);
316         cd->devt_attr = NULL;
317
318         if (cd->release)
319                 cd->release(cd);
320         else if (cls->release)
321                 cls->release(cd);
322         else {
323                 printk(KERN_ERR "Class Device '%s' does not have a release() function, "
324                         "it is broken and must be fixed.\n",
325                         cd->class_id);
326                 WARN_ON(1);
327         }
328 }
329
330 static struct kobj_type ktype_class_device = {
331         .sysfs_ops      = &class_dev_sysfs_ops,
332         .release        = class_dev_release,
333 };
334
335 static int class_uevent_filter(struct kset *kset, struct kobject *kobj)
336 {
337         struct kobj_type *ktype = get_ktype(kobj);
338
339         if (ktype == &ktype_class_device) {
340                 struct class_device *class_dev = to_class_dev(kobj);
341                 if (class_dev->class)
342                         return 1;
343         }
344         return 0;
345 }
346
347 static const char *class_uevent_name(struct kset *kset, struct kobject *kobj)
348 {
349         struct class_device *class_dev = to_class_dev(kobj);
350
351         return class_dev->class->name;
352 }
353
354 #ifdef CONFIG_SYSFS_DEPRECATED
355 char *make_class_name(const char *name, struct kobject *kobj)
356 {
357         char *class_name;
358         int size;
359
360         size = strlen(name) + strlen(kobject_name(kobj)) + 2;
361
362         class_name = kmalloc(size, GFP_KERNEL);
363         if (!class_name)
364                 return NULL;
365
366         strcpy(class_name, name);
367         strcat(class_name, ":");
368         strcat(class_name, kobject_name(kobj));
369         return class_name;
370 }
371
372 static int deprecated_class_uevent(char **envp, int num_envp, int *cur_index,
373                                    char *buffer, int buffer_size,
374                                    int *cur_len,
375                                    struct class_device *class_dev)
376 {
377         struct device *dev = class_dev->dev;
378         char *path;
379
380         if (!dev)
381                 return 0;
382
383         /* add device, backing this class device (deprecated) */
384         path = kobject_get_path(&dev->kobj, GFP_KERNEL);
385
386         add_uevent_var(envp, num_envp, cur_index, buffer, buffer_size,
387                        cur_len, "PHYSDEVPATH=%s", path);
388         kfree(path);
389
390         if (dev->bus)
391                 add_uevent_var(envp, num_envp, cur_index,
392                                buffer, buffer_size, cur_len,
393                                "PHYSDEVBUS=%s", dev->bus->name);
394
395         if (dev->driver)
396                 add_uevent_var(envp, num_envp, cur_index,
397                                buffer, buffer_size, cur_len,
398                                "PHYSDEVDRIVER=%s", dev->driver->name);
399         return 0;
400 }
401
402 static int make_deprecated_class_device_links(struct class_device *class_dev)
403 {
404         char *class_name;
405         int error;
406
407         if (!class_dev->dev)
408                 return 0;
409
410         class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
411         if (class_name)
412                 error = sysfs_create_link(&class_dev->dev->kobj,
413                                           &class_dev->kobj, class_name);
414         else
415                 error = -ENOMEM;
416         kfree(class_name);
417         return error;
418 }
419
420 static void remove_deprecated_class_device_links(struct class_device *class_dev)
421 {
422         char *class_name;
423
424         if (!class_dev->dev)
425                 return;
426
427         class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
428         if (class_name)
429                 sysfs_remove_link(&class_dev->dev->kobj, class_name);
430         kfree(class_name);
431 }
432 #else
433 static inline int deprecated_class_uevent(char **envp, int num_envp,
434                                           int *cur_index, char *buffer,
435                                           int buffer_size, int *cur_len,
436                                           struct class_device *class_dev)
437 { return 0; }
438 static inline int make_deprecated_class_device_links(struct class_device *cd)
439 { return 0; }
440 static void remove_deprecated_class_device_links(struct class_device *cd)
441 { }
442 #endif
443
444 static int class_uevent(struct kset *kset, struct kobject *kobj, char **envp,
445                          int num_envp, char *buffer, int buffer_size)
446 {
447         struct class_device *class_dev = to_class_dev(kobj);
448         int i = 0;
449         int length = 0;
450         int retval = 0;
451
452         pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id);
453
454         deprecated_class_uevent(envp, num_envp, &i, buffer, buffer_size,
455                                 &length, class_dev);
456
457         if (MAJOR(class_dev->devt)) {
458                 add_uevent_var(envp, num_envp, &i,
459                                buffer, buffer_size, &length,
460                                "MAJOR=%u", MAJOR(class_dev->devt));
461
462                 add_uevent_var(envp, num_envp, &i,
463                                buffer, buffer_size, &length,
464                                "MINOR=%u", MINOR(class_dev->devt));
465         }
466
467         /* terminate, set to next free slot, shrink available space */
468         envp[i] = NULL;
469         envp = &envp[i];
470         num_envp -= i;
471         buffer = &buffer[length];
472         buffer_size -= length;
473
474         if (class_dev->uevent) {
475                 /* have the class device specific function add its stuff */
476                 retval = class_dev->uevent(class_dev, envp, num_envp,
477                                             buffer, buffer_size);
478                 if (retval)
479                         pr_debug("class_dev->uevent() returned %d\n", retval);
480         } else if (class_dev->class->uevent) {
481                 /* have the class specific function add its stuff */
482                 retval = class_dev->class->uevent(class_dev, envp, num_envp,
483                                                    buffer, buffer_size);
484                 if (retval)
485                         pr_debug("class->uevent() returned %d\n", retval);
486         }
487
488         return retval;
489 }
490
491 static struct kset_uevent_ops class_uevent_ops = {
492         .filter =       class_uevent_filter,
493         .name =         class_uevent_name,
494         .uevent =       class_uevent,
495 };
496
497 static decl_subsys(class_obj, &ktype_class_device, &class_uevent_ops);
498
499
500 static int class_device_add_attrs(struct class_device * cd)
501 {
502         int i;
503         int error = 0;
504         struct class * cls = cd->class;
505
506         if (cls->class_dev_attrs) {
507                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) {
508                         error = class_device_create_file(cd,
509                                                          &cls->class_dev_attrs[i]);
510                         if (error)
511                                 goto Err;
512                 }
513         }
514  Done:
515         return error;
516  Err:
517         while (--i >= 0)
518                 class_device_remove_file(cd,&cls->class_dev_attrs[i]);
519         goto Done;
520 }
521
522 static void class_device_remove_attrs(struct class_device * cd)
523 {
524         int i;
525         struct class * cls = cd->class;
526
527         if (cls->class_dev_attrs) {
528                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++)
529                         class_device_remove_file(cd,&cls->class_dev_attrs[i]);
530         }
531 }
532
533 static int class_device_add_groups(struct class_device * cd)
534 {
535         int i;
536         int error = 0;
537
538         if (cd->groups) {
539                 for (i = 0; cd->groups[i]; i++) {
540                         error = sysfs_create_group(&cd->kobj, cd->groups[i]);
541                         if (error) {
542                                 while (--i >= 0)
543                                         sysfs_remove_group(&cd->kobj, cd->groups[i]);
544                                 goto out;
545                         }
546                 }
547         }
548 out:
549         return error;
550 }
551
552 static void class_device_remove_groups(struct class_device * cd)
553 {
554         int i;
555         if (cd->groups) {
556                 for (i = 0; cd->groups[i]; i++) {
557                         sysfs_remove_group(&cd->kobj, cd->groups[i]);
558                 }
559         }
560 }
561
562 static ssize_t show_dev(struct class_device *class_dev, char *buf)
563 {
564         return print_dev_t(buf, class_dev->devt);
565 }
566
567 static ssize_t store_uevent(struct class_device *class_dev,
568                             const char *buf, size_t count)
569 {
570         kobject_uevent(&class_dev->kobj, KOBJ_ADD);
571         return count;
572 }
573
574 void class_device_initialize(struct class_device *class_dev)
575 {
576         kobj_set_kset_s(class_dev, class_obj_subsys);
577         kobject_init(&class_dev->kobj);
578         INIT_LIST_HEAD(&class_dev->node);
579 }
580
581 int class_device_add(struct class_device *class_dev)
582 {
583         struct class *parent_class = NULL;
584         struct class_device *parent_class_dev = NULL;
585         struct class_interface *class_intf;
586         int error = -EINVAL;
587
588         class_dev = class_device_get(class_dev);
589         if (!class_dev)
590                 return -EINVAL;
591
592         if (!strlen(class_dev->class_id))
593                 goto out1;
594
595         parent_class = class_get(class_dev->class);
596         if (!parent_class)
597                 goto out1;
598
599         parent_class_dev = class_device_get(class_dev->parent);
600
601         pr_debug("CLASS: registering class device: ID = '%s'\n",
602                  class_dev->class_id);
603
604         /* first, register with generic layer. */
605         error = kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
606         if (error)
607                 goto out2;
608
609         if (parent_class_dev)
610                 class_dev->kobj.parent = &parent_class_dev->kobj;
611         else
612                 class_dev->kobj.parent = &parent_class->subsys.kobj;
613
614         error = kobject_add(&class_dev->kobj);
615         if (error)
616                 goto out2;
617
618         /* add the needed attributes to this device */
619         error = sysfs_create_link(&class_dev->kobj,
620                                   &parent_class->subsys.kobj, "subsystem");
621         if (error)
622                 goto out3;
623         class_dev->uevent_attr.attr.name = "uevent";
624         class_dev->uevent_attr.attr.mode = S_IWUSR;
625         class_dev->uevent_attr.attr.owner = parent_class->owner;
626         class_dev->uevent_attr.store = store_uevent;
627         error = class_device_create_file(class_dev, &class_dev->uevent_attr);
628         if (error)
629                 goto out3;
630
631         if (MAJOR(class_dev->devt)) {
632                 struct class_device_attribute *attr;
633                 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
634                 if (!attr) {
635                         error = -ENOMEM;
636                         goto out4;
637                 }
638                 attr->attr.name = "dev";
639                 attr->attr.mode = S_IRUGO;
640                 attr->attr.owner = parent_class->owner;
641                 attr->show = show_dev;
642                 error = class_device_create_file(class_dev, attr);
643                 if (error) {
644                         kfree(attr);
645                         goto out4;
646                 }
647
648                 class_dev->devt_attr = attr;
649         }
650
651         error = class_device_add_attrs(class_dev);
652         if (error)
653                 goto out5;
654
655         if (class_dev->dev) {
656                 error = sysfs_create_link(&class_dev->kobj,
657                                           &class_dev->dev->kobj, "device");
658                 if (error)
659                         goto out6;
660         }
661
662         error = class_device_add_groups(class_dev);
663         if (error)
664                 goto out7;
665
666         error = make_deprecated_class_device_links(class_dev);
667         if (error)
668                 goto out8;
669
670         kobject_uevent(&class_dev->kobj, KOBJ_ADD);
671
672         /* notify any interfaces this device is now here */
673         down(&parent_class->sem);
674         list_add_tail(&class_dev->node, &parent_class->children);
675         list_for_each_entry(class_intf, &parent_class->interfaces, node) {
676                 if (class_intf->add)
677                         class_intf->add(class_dev, class_intf);
678         }
679         up(&parent_class->sem);
680
681         goto out1;
682
683  out8:
684         class_device_remove_groups(class_dev);
685  out7:
686         if (class_dev->dev)
687                 sysfs_remove_link(&class_dev->kobj, "device");
688  out6:
689         class_device_remove_attrs(class_dev);
690  out5:
691         if (class_dev->devt_attr)
692                 class_device_remove_file(class_dev, class_dev->devt_attr);
693  out4:
694         class_device_remove_file(class_dev, &class_dev->uevent_attr);
695  out3:
696         kobject_del(&class_dev->kobj);
697  out2:
698         if(parent_class_dev)
699                 class_device_put(parent_class_dev);
700         class_put(parent_class);
701  out1:
702         class_device_put(class_dev);
703         return error;
704 }
705
706 int class_device_register(struct class_device *class_dev)
707 {
708         class_device_initialize(class_dev);
709         return class_device_add(class_dev);
710 }
711
712 /**
713  * class_device_create - creates a class device and registers it with sysfs
714  * @cls: pointer to the struct class that this device should be registered to.
715  * @parent: pointer to the parent struct class_device of this new device, if any.
716  * @devt: the dev_t for the char device to be added.
717  * @device: a pointer to a struct device that is assiociated with this class device.
718  * @fmt: string for the class device's name
719  *
720  * This function can be used by char device classes.  A struct
721  * class_device will be created in sysfs, registered to the specified
722  * class.
723  * A "dev" file will be created, showing the dev_t for the device, if
724  * the dev_t is not 0,0.
725  * If a pointer to a parent struct class_device is passed in, the newly
726  * created struct class_device will be a child of that device in sysfs.
727  * The pointer to the struct class_device will be returned from the
728  * call.  Any further sysfs files that might be required can be created
729  * using this pointer.
730  *
731  * Note: the struct class passed to this function must have previously
732  * been created with a call to class_create().
733  */
734 struct class_device *class_device_create(struct class *cls,
735                                          struct class_device *parent,
736                                          dev_t devt,
737                                          struct device *device,
738                                          const char *fmt, ...)
739 {
740         va_list args;
741         struct class_device *class_dev = NULL;
742         int retval = -ENODEV;
743
744         if (cls == NULL || IS_ERR(cls))
745                 goto error;
746
747         class_dev = kzalloc(sizeof(*class_dev), GFP_KERNEL);
748         if (!class_dev) {
749                 retval = -ENOMEM;
750                 goto error;
751         }
752
753         class_dev->devt = devt;
754         class_dev->dev = device;
755         class_dev->class = cls;
756         class_dev->parent = parent;
757         class_dev->release = class_device_create_release;
758         class_dev->uevent = class_device_create_uevent;
759
760         va_start(args, fmt);
761         vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args);
762         va_end(args);
763         retval = class_device_register(class_dev);
764         if (retval)
765                 goto error;
766
767         return class_dev;
768
769 error:
770         kfree(class_dev);
771         return ERR_PTR(retval);
772 }
773
774 void class_device_del(struct class_device *class_dev)
775 {
776         struct class *parent_class = class_dev->class;
777         struct class_device *parent_device = class_dev->parent;
778         struct class_interface *class_intf;
779
780         if (parent_class) {
781                 down(&parent_class->sem);
782                 list_del_init(&class_dev->node);
783                 list_for_each_entry(class_intf, &parent_class->interfaces, node)
784                         if (class_intf->remove)
785                                 class_intf->remove(class_dev, class_intf);
786                 up(&parent_class->sem);
787         }
788
789         if (class_dev->dev) {
790                 remove_deprecated_class_device_links(class_dev);
791                 sysfs_remove_link(&class_dev->kobj, "device");
792         }
793         sysfs_remove_link(&class_dev->kobj, "subsystem");
794         class_device_remove_file(class_dev, &class_dev->uevent_attr);
795         if (class_dev->devt_attr)
796                 class_device_remove_file(class_dev, class_dev->devt_attr);
797         class_device_remove_attrs(class_dev);
798         class_device_remove_groups(class_dev);
799
800         kobject_uevent(&class_dev->kobj, KOBJ_REMOVE);
801         kobject_del(&class_dev->kobj);
802
803         class_device_put(parent_device);
804         class_put(parent_class);
805 }
806
807 void class_device_unregister(struct class_device *class_dev)
808 {
809         pr_debug("CLASS: Unregistering class device. ID = '%s'\n",
810                  class_dev->class_id);
811         class_device_del(class_dev);
812         class_device_put(class_dev);
813 }
814
815 /**
816  * class_device_destroy - removes a class device that was created with class_device_create()
817  * @cls: the pointer to the struct class that this device was registered * with.
818  * @devt: the dev_t of the device that was previously registered.
819  *
820  * This call unregisters and cleans up a class device that was created with a
821  * call to class_device_create()
822  */
823 void class_device_destroy(struct class *cls, dev_t devt)
824 {
825         struct class_device *class_dev = NULL;
826         struct class_device *class_dev_tmp;
827
828         down(&cls->sem);
829         list_for_each_entry(class_dev_tmp, &cls->children, node) {
830                 if (class_dev_tmp->devt == devt) {
831                         class_dev = class_dev_tmp;
832                         break;
833                 }
834         }
835         up(&cls->sem);
836
837         if (class_dev)
838                 class_device_unregister(class_dev);
839 }
840
841 struct class_device * class_device_get(struct class_device *class_dev)
842 {
843         if (class_dev)
844                 return to_class_dev(kobject_get(&class_dev->kobj));
845         return NULL;
846 }
847
848 void class_device_put(struct class_device *class_dev)
849 {
850         if (class_dev)
851                 kobject_put(&class_dev->kobj);
852 }
853
854
855 int class_interface_register(struct class_interface *class_intf)
856 {
857         struct class *parent;
858         struct class_device *class_dev;
859         struct device *dev;
860
861         if (!class_intf || !class_intf->class)
862                 return -ENODEV;
863
864         parent = class_get(class_intf->class);
865         if (!parent)
866                 return -EINVAL;
867
868         down(&parent->sem);
869         list_add_tail(&class_intf->node, &parent->interfaces);
870         if (class_intf->add) {
871                 list_for_each_entry(class_dev, &parent->children, node)
872                         class_intf->add(class_dev, class_intf);
873         }
874         if (class_intf->add_dev) {
875                 list_for_each_entry(dev, &parent->devices, node)
876                         class_intf->add_dev(dev, class_intf);
877         }
878         up(&parent->sem);
879
880         return 0;
881 }
882
883 void class_interface_unregister(struct class_interface *class_intf)
884 {
885         struct class * parent = class_intf->class;
886         struct class_device *class_dev;
887         struct device *dev;
888
889         if (!parent)
890                 return;
891
892         down(&parent->sem);
893         list_del_init(&class_intf->node);
894         if (class_intf->remove) {
895                 list_for_each_entry(class_dev, &parent->children, node)
896                         class_intf->remove(class_dev, class_intf);
897         }
898         if (class_intf->remove_dev) {
899                 list_for_each_entry(dev, &parent->devices, node)
900                         class_intf->remove_dev(dev, class_intf);
901         }
902         up(&parent->sem);
903
904         class_put(parent);
905 }
906
907 int __init classes_init(void)
908 {
909         int retval;
910
911         retval = subsystem_register(&class_subsys);
912         if (retval)
913                 return retval;
914
915         /* ick, this is ugly, the things we go through to keep from showing up
916          * in sysfs... */
917         subsystem_init(&class_obj_subsys);
918         if (!class_obj_subsys.kobj.parent)
919                 class_obj_subsys.kobj.parent = &class_obj_subsys.kobj;
920         return 0;
921 }
922
923 EXPORT_SYMBOL_GPL(class_create_file);
924 EXPORT_SYMBOL_GPL(class_remove_file);
925 EXPORT_SYMBOL_GPL(class_register);
926 EXPORT_SYMBOL_GPL(class_unregister);
927 EXPORT_SYMBOL_GPL(class_create);
928 EXPORT_SYMBOL_GPL(class_destroy);
929
930 EXPORT_SYMBOL_GPL(class_device_register);
931 EXPORT_SYMBOL_GPL(class_device_unregister);
932 EXPORT_SYMBOL_GPL(class_device_initialize);
933 EXPORT_SYMBOL_GPL(class_device_add);
934 EXPORT_SYMBOL_GPL(class_device_del);
935 EXPORT_SYMBOL_GPL(class_device_get);
936 EXPORT_SYMBOL_GPL(class_device_put);
937 EXPORT_SYMBOL_GPL(class_device_create);
938 EXPORT_SYMBOL_GPL(class_device_destroy);
939 EXPORT_SYMBOL_GPL(class_device_create_file);
940 EXPORT_SYMBOL_GPL(class_device_remove_file);
941 EXPORT_SYMBOL_GPL(class_device_create_bin_file);
942 EXPORT_SYMBOL_GPL(class_device_remove_bin_file);
943
944 EXPORT_SYMBOL_GPL(class_interface_register);
945 EXPORT_SYMBOL_GPL(class_interface_unregister);