Pull altix into release branch
[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 extern struct subsystem devices_subsys;
23
24 #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)
25 #define to_class(obj) container_of(obj, struct class, subsys.kset.kobj)
26
27 static ssize_t
28 class_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
29 {
30         struct class_attribute * class_attr = to_class_attr(attr);
31         struct class * dc = to_class(kobj);
32         ssize_t ret = -EIO;
33
34         if (class_attr->show)
35                 ret = class_attr->show(dc, buf);
36         return ret;
37 }
38
39 static ssize_t
40 class_attr_store(struct kobject * kobj, struct attribute * attr,
41                  const char * buf, size_t count)
42 {
43         struct class_attribute * class_attr = to_class_attr(attr);
44         struct class * dc = to_class(kobj);
45         ssize_t ret = -EIO;
46
47         if (class_attr->store)
48                 ret = class_attr->store(dc, buf, count);
49         return ret;
50 }
51
52 static void class_release(struct kobject * kobj)
53 {
54         struct class *class = to_class(kobj);
55
56         pr_debug("class '%s': release.\n", class->name);
57
58         if (class->class_release)
59                 class->class_release(class);
60         else
61                 pr_debug("class '%s' does not have a release() function, "
62                          "be careful\n", class->name);
63 }
64
65 static struct sysfs_ops class_sysfs_ops = {
66         .show   = class_attr_show,
67         .store  = class_attr_store,
68 };
69
70 static struct kobj_type ktype_class = {
71         .sysfs_ops      = &class_sysfs_ops,
72         .release        = class_release,
73 };
74
75 /* Hotplug events for classes go to the class_obj subsys */
76 static decl_subsys(class, &ktype_class, NULL);
77
78
79 int class_create_file(struct class * cls, const struct class_attribute * attr)
80 {
81         int error;
82         if (cls) {
83                 error = sysfs_create_file(&cls->subsys.kset.kobj, &attr->attr);
84         } else
85                 error = -EINVAL;
86         return error;
87 }
88
89 void class_remove_file(struct class * cls, const struct class_attribute * attr)
90 {
91         if (cls)
92                 sysfs_remove_file(&cls->subsys.kset.kobj, &attr->attr);
93 }
94
95 static struct class *class_get(struct class *cls)
96 {
97         if (cls)
98                 return container_of(subsys_get(&cls->subsys), struct class, subsys);
99         return NULL;
100 }
101
102 static void class_put(struct class * cls)
103 {
104         if (cls)
105                 subsys_put(&cls->subsys);
106 }
107
108
109 static int add_class_attrs(struct class * cls)
110 {
111         int i;
112         int error = 0;
113
114         if (cls->class_attrs) {
115                 for (i = 0; attr_name(cls->class_attrs[i]); i++) {
116                         error = class_create_file(cls,&cls->class_attrs[i]);
117                         if (error)
118                                 goto Err;
119                 }
120         }
121  Done:
122         return error;
123  Err:
124         while (--i >= 0)
125                 class_remove_file(cls,&cls->class_attrs[i]);
126         goto Done;
127 }
128
129 static void remove_class_attrs(struct class * cls)
130 {
131         int i;
132
133         if (cls->class_attrs) {
134                 for (i = 0; attr_name(cls->class_attrs[i]); i++)
135                         class_remove_file(cls,&cls->class_attrs[i]);
136         }
137 }
138
139 int class_register(struct class * cls)
140 {
141         int error;
142
143         pr_debug("device class '%s': registering\n", cls->name);
144
145         INIT_LIST_HEAD(&cls->children);
146         INIT_LIST_HEAD(&cls->devices);
147         INIT_LIST_HEAD(&cls->interfaces);
148         init_MUTEX(&cls->sem);
149         error = kobject_set_name(&cls->subsys.kset.kobj, "%s", cls->name);
150         if (error)
151                 return error;
152
153         subsys_set_kset(cls, class_subsys);
154
155         error = subsystem_register(&cls->subsys);
156         if (!error) {
157                 error = add_class_attrs(class_get(cls));
158                 class_put(cls);
159         }
160         return error;
161 }
162
163 void class_unregister(struct class * cls)
164 {
165         pr_debug("device class '%s': unregistering\n", cls->name);
166         kobject_unregister(cls->virtual_dir);
167         remove_class_attrs(cls);
168         subsystem_unregister(&cls->subsys);
169 }
170
171 static void class_create_release(struct class *cls)
172 {
173         pr_debug("%s called for %s\n", __FUNCTION__, cls->name);
174         kfree(cls);
175 }
176
177 static void class_device_create_release(struct class_device *class_dev)
178 {
179         pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id);
180         kfree(class_dev);
181 }
182
183 /* needed to allow these devices to have parent class devices */
184 static int class_device_create_uevent(struct class_device *class_dev,
185                                        char **envp, int num_envp,
186                                        char *buffer, int buffer_size)
187 {
188         pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id);
189         return 0;
190 }
191
192 /**
193  * class_create - create a struct class structure
194  * @owner: pointer to the module that is to "own" this struct class
195  * @name: pointer to a string for the name of this class.
196  *
197  * This is used to create a struct class pointer that can then be used
198  * in calls to class_device_create().
199  *
200  * Note, the pointer created here is to be destroyed when finished by
201  * making a call to class_destroy().
202  */
203 struct class *class_create(struct module *owner, const char *name)
204 {
205         struct class *cls;
206         int retval;
207
208         cls = kzalloc(sizeof(*cls), GFP_KERNEL);
209         if (!cls) {
210                 retval = -ENOMEM;
211                 goto error;
212         }
213
214         cls->name = name;
215         cls->owner = owner;
216         cls->class_release = class_create_release;
217         cls->release = class_device_create_release;
218
219         retval = class_register(cls);
220         if (retval)
221                 goto error;
222
223         return cls;
224
225 error:
226         kfree(cls);
227         return ERR_PTR(retval);
228 }
229
230 /**
231  * class_destroy - destroys a struct class structure
232  * @cls: pointer to the struct class that is to be destroyed
233  *
234  * Note, the pointer to be destroyed must have been created with a call
235  * to class_create().
236  */
237 void class_destroy(struct class *cls)
238 {
239         if ((cls == NULL) || (IS_ERR(cls)))
240                 return;
241
242         class_unregister(cls);
243 }
244
245 /* Class Device Stuff */
246
247 int class_device_create_file(struct class_device * class_dev,
248                              const struct class_device_attribute * attr)
249 {
250         int error = -EINVAL;
251         if (class_dev)
252                 error = sysfs_create_file(&class_dev->kobj, &attr->attr);
253         return error;
254 }
255
256 void class_device_remove_file(struct class_device * class_dev,
257                               const struct class_device_attribute * attr)
258 {
259         if (class_dev)
260                 sysfs_remove_file(&class_dev->kobj, &attr->attr);
261 }
262
263 int class_device_create_bin_file(struct class_device *class_dev,
264                                  struct bin_attribute *attr)
265 {
266         int error = -EINVAL;
267         if (class_dev)
268                 error = sysfs_create_bin_file(&class_dev->kobj, attr);
269         return error;
270 }
271
272 void class_device_remove_bin_file(struct class_device *class_dev,
273                                   struct bin_attribute *attr)
274 {
275         if (class_dev)
276                 sysfs_remove_bin_file(&class_dev->kobj, attr);
277 }
278
279 static ssize_t
280 class_device_attr_show(struct kobject * kobj, struct attribute * attr,
281                        char * buf)
282 {
283         struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
284         struct class_device * cd = to_class_dev(kobj);
285         ssize_t ret = 0;
286
287         if (class_dev_attr->show)
288                 ret = class_dev_attr->show(cd, buf);
289         return ret;
290 }
291
292 static ssize_t
293 class_device_attr_store(struct kobject * kobj, struct attribute * attr,
294                         const char * buf, size_t count)
295 {
296         struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
297         struct class_device * cd = to_class_dev(kobj);
298         ssize_t ret = 0;
299
300         if (class_dev_attr->store)
301                 ret = class_dev_attr->store(cd, buf, count);
302         return ret;
303 }
304
305 static struct sysfs_ops class_dev_sysfs_ops = {
306         .show   = class_device_attr_show,
307         .store  = class_device_attr_store,
308 };
309
310 static void class_dev_release(struct kobject * kobj)
311 {
312         struct class_device *cd = to_class_dev(kobj);
313         struct class * cls = cd->class;
314
315         pr_debug("device class '%s': release.\n", cd->class_id);
316
317         kfree(cd->devt_attr);
318         cd->devt_attr = NULL;
319
320         if (cd->release)
321                 cd->release(cd);
322         else if (cls->release)
323                 cls->release(cd);
324         else {
325                 printk(KERN_ERR "Class Device '%s' does not have a release() function, "
326                         "it is broken and must be fixed.\n",
327                         cd->class_id);
328                 WARN_ON(1);
329         }
330 }
331
332 static struct kobj_type ktype_class_device = {
333         .sysfs_ops      = &class_dev_sysfs_ops,
334         .release        = class_dev_release,
335 };
336
337 static int class_uevent_filter(struct kset *kset, struct kobject *kobj)
338 {
339         struct kobj_type *ktype = get_ktype(kobj);
340
341         if (ktype == &ktype_class_device) {
342                 struct class_device *class_dev = to_class_dev(kobj);
343                 if (class_dev->class)
344                         return 1;
345         }
346         return 0;
347 }
348
349 static const char *class_uevent_name(struct kset *kset, struct kobject *kobj)
350 {
351         struct class_device *class_dev = to_class_dev(kobj);
352
353         return class_dev->class->name;
354 }
355
356 #ifdef CONFIG_SYSFS_DEPRECATED
357 char *make_class_name(const char *name, struct kobject *kobj)
358 {
359         char *class_name;
360         int size;
361
362         size = strlen(name) + strlen(kobject_name(kobj)) + 2;
363
364         class_name = kmalloc(size, GFP_KERNEL);
365         if (!class_name)
366                 return NULL;
367
368         strcpy(class_name, name);
369         strcat(class_name, ":");
370         strcat(class_name, kobject_name(kobj));
371         return class_name;
372 }
373
374 static int deprecated_class_uevent(char **envp, int num_envp, int *cur_index,
375                                    char *buffer, int buffer_size,
376                                    int *cur_len,
377                                    struct class_device *class_dev)
378 {
379         struct device *dev = class_dev->dev;
380         char *path;
381
382         if (!dev)
383                 return 0;
384
385         /* add device, backing this class device (deprecated) */
386         path = kobject_get_path(&dev->kobj, GFP_KERNEL);
387
388         add_uevent_var(envp, num_envp, cur_index, buffer, buffer_size,
389                        cur_len, "PHYSDEVPATH=%s", path);
390         kfree(path);
391
392         if (dev->bus)
393                 add_uevent_var(envp, num_envp, cur_index,
394                                buffer, buffer_size, cur_len,
395                                "PHYSDEVBUS=%s", dev->bus->name);
396
397         if (dev->driver)
398                 add_uevent_var(envp, num_envp, cur_index,
399                                buffer, buffer_size, cur_len,
400                                "PHYSDEVDRIVER=%s", dev->driver->name);
401         return 0;
402 }
403
404 static int make_deprecated_class_device_links(struct class_device *class_dev)
405 {
406         char *class_name;
407         int error;
408
409         if (!class_dev->dev)
410                 return 0;
411
412         class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
413         if (class_name)
414                 error = sysfs_create_link(&class_dev->dev->kobj,
415                                           &class_dev->kobj, class_name);
416         else
417                 error = -ENOMEM;
418         kfree(class_name);
419         return error;
420 }
421
422 static void remove_deprecated_class_device_links(struct class_device *class_dev)
423 {
424         char *class_name;
425
426         if (!class_dev->dev)
427                 return;
428
429         class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
430         if (class_name)
431                 sysfs_remove_link(&class_dev->dev->kobj, class_name);
432         kfree(class_name);
433 }
434 #else
435 static inline int deprecated_class_uevent(char **envp, int num_envp,
436                                           int *cur_index, char *buffer,
437                                           int buffer_size, int *cur_len,
438                                           struct class_device *class_dev)
439 { return 0; }
440 static inline int make_deprecated_class_device_links(struct class_device *cd)
441 { return 0; }
442 static void remove_deprecated_class_device_links(struct class_device *cd)
443 { }
444 #endif
445
446 static int class_uevent(struct kset *kset, struct kobject *kobj, char **envp,
447                          int num_envp, char *buffer, int buffer_size)
448 {
449         struct class_device *class_dev = to_class_dev(kobj);
450         int i = 0;
451         int length = 0;
452         int retval = 0;
453
454         pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id);
455
456         deprecated_class_uevent(envp, num_envp, &i, buffer, buffer_size,
457                                 &length, class_dev);
458
459         if (MAJOR(class_dev->devt)) {
460                 add_uevent_var(envp, num_envp, &i,
461                                buffer, buffer_size, &length,
462                                "MAJOR=%u", MAJOR(class_dev->devt));
463
464                 add_uevent_var(envp, num_envp, &i,
465                                buffer, buffer_size, &length,
466                                "MINOR=%u", MINOR(class_dev->devt));
467         }
468
469         /* terminate, set to next free slot, shrink available space */
470         envp[i] = NULL;
471         envp = &envp[i];
472         num_envp -= i;
473         buffer = &buffer[length];
474         buffer_size -= length;
475
476         if (class_dev->uevent) {
477                 /* have the class device specific function add its stuff */
478                 retval = class_dev->uevent(class_dev, envp, num_envp,
479                                             buffer, buffer_size);
480                 if (retval)
481                         pr_debug("class_dev->uevent() returned %d\n", retval);
482         } else if (class_dev->class->uevent) {
483                 /* have the class specific function add its stuff */
484                 retval = class_dev->class->uevent(class_dev, envp, num_envp,
485                                                    buffer, buffer_size);
486                 if (retval)
487                         pr_debug("class->uevent() returned %d\n", retval);
488         }
489
490         return retval;
491 }
492
493 static struct kset_uevent_ops class_uevent_ops = {
494         .filter =       class_uevent_filter,
495         .name =         class_uevent_name,
496         .uevent =       class_uevent,
497 };
498
499 static decl_subsys(class_obj, &ktype_class_device, &class_uevent_ops);
500
501
502 static int class_device_add_attrs(struct class_device * cd)
503 {
504         int i;
505         int error = 0;
506         struct class * cls = cd->class;
507
508         if (cls->class_dev_attrs) {
509                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) {
510                         error = class_device_create_file(cd,
511                                                          &cls->class_dev_attrs[i]);
512                         if (error)
513                                 goto Err;
514                 }
515         }
516  Done:
517         return error;
518  Err:
519         while (--i >= 0)
520                 class_device_remove_file(cd,&cls->class_dev_attrs[i]);
521         goto Done;
522 }
523
524 static void class_device_remove_attrs(struct class_device * cd)
525 {
526         int i;
527         struct class * cls = cd->class;
528
529         if (cls->class_dev_attrs) {
530                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++)
531                         class_device_remove_file(cd,&cls->class_dev_attrs[i]);
532         }
533 }
534
535 static int class_device_add_groups(struct class_device * cd)
536 {
537         int i;
538         int error = 0;
539
540         if (cd->groups) {
541                 for (i = 0; cd->groups[i]; i++) {
542                         error = sysfs_create_group(&cd->kobj, cd->groups[i]);
543                         if (error) {
544                                 while (--i >= 0)
545                                         sysfs_remove_group(&cd->kobj, cd->groups[i]);
546                                 goto out;
547                         }
548                 }
549         }
550 out:
551         return error;
552 }
553
554 static void class_device_remove_groups(struct class_device * cd)
555 {
556         int i;
557         if (cd->groups) {
558                 for (i = 0; cd->groups[i]; i++) {
559                         sysfs_remove_group(&cd->kobj, cd->groups[i]);
560                 }
561         }
562 }
563
564 static ssize_t show_dev(struct class_device *class_dev, char *buf)
565 {
566         return print_dev_t(buf, class_dev->devt);
567 }
568
569 static ssize_t store_uevent(struct class_device *class_dev,
570                             const char *buf, size_t count)
571 {
572         kobject_uevent(&class_dev->kobj, KOBJ_ADD);
573         return count;
574 }
575
576 void class_device_initialize(struct class_device *class_dev)
577 {
578         kobj_set_kset_s(class_dev, class_obj_subsys);
579         kobject_init(&class_dev->kobj);
580         INIT_LIST_HEAD(&class_dev->node);
581 }
582
583 int class_device_add(struct class_device *class_dev)
584 {
585         struct class *parent_class = NULL;
586         struct class_device *parent_class_dev = NULL;
587         struct class_interface *class_intf;
588         int error = -EINVAL;
589
590         class_dev = class_device_get(class_dev);
591         if (!class_dev)
592                 return -EINVAL;
593
594         if (!strlen(class_dev->class_id))
595                 goto out1;
596
597         parent_class = class_get(class_dev->class);
598         if (!parent_class)
599                 goto out1;
600
601         parent_class_dev = class_device_get(class_dev->parent);
602
603         pr_debug("CLASS: registering class device: ID = '%s'\n",
604                  class_dev->class_id);
605
606         /* first, register with generic layer. */
607         error = kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
608         if (error)
609                 goto out2;
610
611         if (parent_class_dev)
612                 class_dev->kobj.parent = &parent_class_dev->kobj;
613         else
614                 class_dev->kobj.parent = &parent_class->subsys.kset.kobj;
615
616         error = kobject_add(&class_dev->kobj);
617         if (error)
618                 goto out2;
619
620         /* add the needed attributes to this device */
621         error = sysfs_create_link(&class_dev->kobj,
622                                   &parent_class->subsys.kset.kobj, "subsystem");
623         if (error)
624                 goto out3;
625         class_dev->uevent_attr.attr.name = "uevent";
626         class_dev->uevent_attr.attr.mode = S_IWUSR;
627         class_dev->uevent_attr.attr.owner = parent_class->owner;
628         class_dev->uevent_attr.store = store_uevent;
629         error = class_device_create_file(class_dev, &class_dev->uevent_attr);
630         if (error)
631                 goto out3;
632
633         if (MAJOR(class_dev->devt)) {
634                 struct class_device_attribute *attr;
635                 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
636                 if (!attr) {
637                         error = -ENOMEM;
638                         goto out4;
639                 }
640                 attr->attr.name = "dev";
641                 attr->attr.mode = S_IRUGO;
642                 attr->attr.owner = parent_class->owner;
643                 attr->show = show_dev;
644                 error = class_device_create_file(class_dev, attr);
645                 if (error) {
646                         kfree(attr);
647                         goto out4;
648                 }
649
650                 class_dev->devt_attr = attr;
651         }
652
653         error = class_device_add_attrs(class_dev);
654         if (error)
655                 goto out5;
656
657         if (class_dev->dev) {
658                 error = sysfs_create_link(&class_dev->kobj,
659                                           &class_dev->dev->kobj, "device");
660                 if (error)
661                         goto out6;
662         }
663
664         error = class_device_add_groups(class_dev);
665         if (error)
666                 goto out7;
667
668         error = make_deprecated_class_device_links(class_dev);
669         if (error)
670                 goto out8;
671
672         kobject_uevent(&class_dev->kobj, KOBJ_ADD);
673
674         /* notify any interfaces this device is now here */
675         down(&parent_class->sem);
676         list_add_tail(&class_dev->node, &parent_class->children);
677         list_for_each_entry(class_intf, &parent_class->interfaces, node) {
678                 if (class_intf->add)
679                         class_intf->add(class_dev, class_intf);
680         }
681         up(&parent_class->sem);
682
683         goto out1;
684
685  out8:
686         class_device_remove_groups(class_dev);
687  out7:
688         if (class_dev->dev)
689                 sysfs_remove_link(&class_dev->kobj, "device");
690  out6:
691         class_device_remove_attrs(class_dev);
692  out5:
693         if (class_dev->devt_attr)
694                 class_device_remove_file(class_dev, class_dev->devt_attr);
695  out4:
696         class_device_remove_file(class_dev, &class_dev->uevent_attr);
697  out3:
698         kobject_del(&class_dev->kobj);
699  out2:
700         if(parent_class_dev)
701                 class_device_put(parent_class_dev);
702         class_put(parent_class);
703  out1:
704         class_device_put(class_dev);
705         return error;
706 }
707
708 int class_device_register(struct class_device *class_dev)
709 {
710         class_device_initialize(class_dev);
711         return class_device_add(class_dev);
712 }
713
714 /**
715  * class_device_create - creates a class device and registers it with sysfs
716  * @cls: pointer to the struct class that this device should be registered to.
717  * @parent: pointer to the parent struct class_device of this new device, if any.
718  * @devt: the dev_t for the char device to be added.
719  * @device: a pointer to a struct device that is assiociated with this class device.
720  * @fmt: string for the class device's name
721  *
722  * This function can be used by char device classes.  A struct
723  * class_device will be created in sysfs, registered to the specified
724  * class.
725  * A "dev" file will be created, showing the dev_t for the device, if
726  * the dev_t is not 0,0.
727  * If a pointer to a parent struct class_device is passed in, the newly
728  * created struct class_device will be a child of that device in sysfs.
729  * The pointer to the struct class_device will be returned from the
730  * call.  Any further sysfs files that might be required can be created
731  * using this pointer.
732  *
733  * Note: the struct class passed to this function must have previously
734  * been created with a call to class_create().
735  */
736 struct class_device *class_device_create(struct class *cls,
737                                          struct class_device *parent,
738                                          dev_t devt,
739                                          struct device *device,
740                                          const char *fmt, ...)
741 {
742         va_list args;
743         struct class_device *class_dev = NULL;
744         int retval = -ENODEV;
745
746         if (cls == NULL || IS_ERR(cls))
747                 goto error;
748
749         class_dev = kzalloc(sizeof(*class_dev), GFP_KERNEL);
750         if (!class_dev) {
751                 retval = -ENOMEM;
752                 goto error;
753         }
754
755         class_dev->devt = devt;
756         class_dev->dev = device;
757         class_dev->class = cls;
758         class_dev->parent = parent;
759         class_dev->release = class_device_create_release;
760         class_dev->uevent = class_device_create_uevent;
761
762         va_start(args, fmt);
763         vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args);
764         va_end(args);
765         retval = class_device_register(class_dev);
766         if (retval)
767                 goto error;
768
769         return class_dev;
770
771 error:
772         kfree(class_dev);
773         return ERR_PTR(retval);
774 }
775
776 void class_device_del(struct class_device *class_dev)
777 {
778         struct class *parent_class = class_dev->class;
779         struct class_device *parent_device = class_dev->parent;
780         struct class_interface *class_intf;
781
782         if (parent_class) {
783                 down(&parent_class->sem);
784                 list_del_init(&class_dev->node);
785                 list_for_each_entry(class_intf, &parent_class->interfaces, node)
786                         if (class_intf->remove)
787                                 class_intf->remove(class_dev, class_intf);
788                 up(&parent_class->sem);
789         }
790
791         if (class_dev->dev) {
792                 remove_deprecated_class_device_links(class_dev);
793                 sysfs_remove_link(&class_dev->kobj, "device");
794         }
795         sysfs_remove_link(&class_dev->kobj, "subsystem");
796         class_device_remove_file(class_dev, &class_dev->uevent_attr);
797         if (class_dev->devt_attr)
798                 class_device_remove_file(class_dev, class_dev->devt_attr);
799         class_device_remove_attrs(class_dev);
800         class_device_remove_groups(class_dev);
801
802         kobject_uevent(&class_dev->kobj, KOBJ_REMOVE);
803         kobject_del(&class_dev->kobj);
804
805         class_device_put(parent_device);
806         class_put(parent_class);
807 }
808
809 void class_device_unregister(struct class_device *class_dev)
810 {
811         pr_debug("CLASS: Unregistering class device. ID = '%s'\n",
812                  class_dev->class_id);
813         class_device_del(class_dev);
814         class_device_put(class_dev);
815 }
816
817 /**
818  * class_device_destroy - removes a class device that was created with class_device_create()
819  * @cls: the pointer to the struct class that this device was registered * with.
820  * @devt: the dev_t of the device that was previously registered.
821  *
822  * This call unregisters and cleans up a class device that was created with a
823  * call to class_device_create()
824  */
825 void class_device_destroy(struct class *cls, dev_t devt)
826 {
827         struct class_device *class_dev = NULL;
828         struct class_device *class_dev_tmp;
829
830         down(&cls->sem);
831         list_for_each_entry(class_dev_tmp, &cls->children, node) {
832                 if (class_dev_tmp->devt == devt) {
833                         class_dev = class_dev_tmp;
834                         break;
835                 }
836         }
837         up(&cls->sem);
838
839         if (class_dev)
840                 class_device_unregister(class_dev);
841 }
842
843 struct class_device * class_device_get(struct class_device *class_dev)
844 {
845         if (class_dev)
846                 return to_class_dev(kobject_get(&class_dev->kobj));
847         return NULL;
848 }
849
850 void class_device_put(struct class_device *class_dev)
851 {
852         if (class_dev)
853                 kobject_put(&class_dev->kobj);
854 }
855
856
857 int class_interface_register(struct class_interface *class_intf)
858 {
859         struct class *parent;
860         struct class_device *class_dev;
861         struct device *dev;
862
863         if (!class_intf || !class_intf->class)
864                 return -ENODEV;
865
866         parent = class_get(class_intf->class);
867         if (!parent)
868                 return -EINVAL;
869
870         down(&parent->sem);
871         list_add_tail(&class_intf->node, &parent->interfaces);
872         if (class_intf->add) {
873                 list_for_each_entry(class_dev, &parent->children, node)
874                         class_intf->add(class_dev, class_intf);
875         }
876         if (class_intf->add_dev) {
877                 list_for_each_entry(dev, &parent->devices, node)
878                         class_intf->add_dev(dev, class_intf);
879         }
880         up(&parent->sem);
881
882         return 0;
883 }
884
885 void class_interface_unregister(struct class_interface *class_intf)
886 {
887         struct class * parent = class_intf->class;
888         struct class_device *class_dev;
889         struct device *dev;
890
891         if (!parent)
892                 return;
893
894         down(&parent->sem);
895         list_del_init(&class_intf->node);
896         if (class_intf->remove) {
897                 list_for_each_entry(class_dev, &parent->children, node)
898                         class_intf->remove(class_dev, class_intf);
899         }
900         if (class_intf->remove_dev) {
901                 list_for_each_entry(dev, &parent->devices, node)
902                         class_intf->remove_dev(dev, class_intf);
903         }
904         up(&parent->sem);
905
906         class_put(parent);
907 }
908
909 int __init classes_init(void)
910 {
911         int retval;
912
913         retval = subsystem_register(&class_subsys);
914         if (retval)
915                 return retval;
916
917         /* ick, this is ugly, the things we go through to keep from showing up
918          * in sysfs... */
919         subsystem_init(&class_obj_subsys);
920         if (!class_obj_subsys.kset.subsys)
921                         class_obj_subsys.kset.subsys = &class_obj_subsys;
922         return 0;
923 }
924
925 EXPORT_SYMBOL_GPL(class_create_file);
926 EXPORT_SYMBOL_GPL(class_remove_file);
927 EXPORT_SYMBOL_GPL(class_register);
928 EXPORT_SYMBOL_GPL(class_unregister);
929 EXPORT_SYMBOL_GPL(class_create);
930 EXPORT_SYMBOL_GPL(class_destroy);
931
932 EXPORT_SYMBOL_GPL(class_device_register);
933 EXPORT_SYMBOL_GPL(class_device_unregister);
934 EXPORT_SYMBOL_GPL(class_device_initialize);
935 EXPORT_SYMBOL_GPL(class_device_add);
936 EXPORT_SYMBOL_GPL(class_device_del);
937 EXPORT_SYMBOL_GPL(class_device_get);
938 EXPORT_SYMBOL_GPL(class_device_put);
939 EXPORT_SYMBOL_GPL(class_device_create);
940 EXPORT_SYMBOL_GPL(class_device_destroy);
941 EXPORT_SYMBOL_GPL(class_device_create_file);
942 EXPORT_SYMBOL_GPL(class_device_remove_file);
943 EXPORT_SYMBOL_GPL(class_device_create_bin_file);
944 EXPORT_SYMBOL_GPL(class_device_remove_bin_file);
945
946 EXPORT_SYMBOL_GPL(class_interface_register);
947 EXPORT_SYMBOL_GPL(class_interface_unregister);