CONFIG_SYSFS_DEPRECATED - class symlinks
[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 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         remove_class_attrs(cls);
167         subsystem_unregister(&cls->subsys);
168 }
169
170 static void class_create_release(struct class *cls)
171 {
172         pr_debug("%s called for %s\n", __FUNCTION__, cls->name);
173         kfree(cls);
174 }
175
176 static void class_device_create_release(struct class_device *class_dev)
177 {
178         pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id);
179         kfree(class_dev);
180 }
181
182 /* needed to allow these devices to have parent class devices */
183 static int class_device_create_uevent(struct class_device *class_dev,
184                                        char **envp, int num_envp,
185                                        char *buffer, int buffer_size)
186 {
187         pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id);
188         return 0;
189 }
190
191 /**
192  * class_create - create a struct class structure
193  * @owner: pointer to the module that is to "own" this struct class
194  * @name: pointer to a string for the name of this class.
195  *
196  * This is used to create a struct class pointer that can then be used
197  * in calls to class_device_create().
198  *
199  * Note, the pointer created here is to be destroyed when finished by
200  * making a call to class_destroy().
201  */
202 struct class *class_create(struct module *owner, const char *name)
203 {
204         struct class *cls;
205         int retval;
206
207         cls = kzalloc(sizeof(*cls), GFP_KERNEL);
208         if (!cls) {
209                 retval = -ENOMEM;
210                 goto error;
211         }
212
213         cls->name = name;
214         cls->owner = owner;
215         cls->class_release = class_create_release;
216         cls->release = class_device_create_release;
217
218         retval = class_register(cls);
219         if (retval)
220                 goto error;
221
222         return cls;
223
224 error:
225         kfree(cls);
226         return ERR_PTR(retval);
227 }
228
229 /**
230  * class_destroy - destroys a struct class structure
231  * @cls: pointer to the struct class that is to be destroyed
232  *
233  * Note, the pointer to be destroyed must have been created with a call
234  * to class_create().
235  */
236 void class_destroy(struct class *cls)
237 {
238         if ((cls == NULL) || (IS_ERR(cls)))
239                 return;
240
241         class_unregister(cls);
242 }
243
244 /* Class Device Stuff */
245
246 int class_device_create_file(struct class_device * class_dev,
247                              const struct class_device_attribute * attr)
248 {
249         int error = -EINVAL;
250         if (class_dev)
251                 error = sysfs_create_file(&class_dev->kobj, &attr->attr);
252         return error;
253 }
254
255 void class_device_remove_file(struct class_device * class_dev,
256                               const struct class_device_attribute * attr)
257 {
258         if (class_dev)
259                 sysfs_remove_file(&class_dev->kobj, &attr->attr);
260 }
261
262 int class_device_create_bin_file(struct class_device *class_dev,
263                                  struct bin_attribute *attr)
264 {
265         int error = -EINVAL;
266         if (class_dev)
267                 error = sysfs_create_bin_file(&class_dev->kobj, attr);
268         return error;
269 }
270
271 void class_device_remove_bin_file(struct class_device *class_dev,
272                                   struct bin_attribute *attr)
273 {
274         if (class_dev)
275                 sysfs_remove_bin_file(&class_dev->kobj, attr);
276 }
277
278 static ssize_t
279 class_device_attr_show(struct kobject * kobj, struct attribute * attr,
280                        char * buf)
281 {
282         struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
283         struct class_device * cd = to_class_dev(kobj);
284         ssize_t ret = 0;
285
286         if (class_dev_attr->show)
287                 ret = class_dev_attr->show(cd, buf);
288         return ret;
289 }
290
291 static ssize_t
292 class_device_attr_store(struct kobject * kobj, struct attribute * attr,
293                         const char * buf, size_t count)
294 {
295         struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
296         struct class_device * cd = to_class_dev(kobj);
297         ssize_t ret = 0;
298
299         if (class_dev_attr->store)
300                 ret = class_dev_attr->store(cd, buf, count);
301         return ret;
302 }
303
304 static struct sysfs_ops class_dev_sysfs_ops = {
305         .show   = class_device_attr_show,
306         .store  = class_device_attr_store,
307 };
308
309 static void class_dev_release(struct kobject * kobj)
310 {
311         struct class_device *cd = to_class_dev(kobj);
312         struct class * cls = cd->class;
313
314         pr_debug("device class '%s': release.\n", cd->class_id);
315
316         kfree(cd->devt_attr);
317         cd->devt_attr = NULL;
318
319         if (cd->release)
320                 cd->release(cd);
321         else if (cls->release)
322                 cls->release(cd);
323         else {
324                 printk(KERN_ERR "Class Device '%s' does not have a release() function, "
325                         "it is broken and must be fixed.\n",
326                         cd->class_id);
327                 WARN_ON(1);
328         }
329 }
330
331 static struct kobj_type ktype_class_device = {
332         .sysfs_ops      = &class_dev_sysfs_ops,
333         .release        = class_dev_release,
334 };
335
336 static int class_uevent_filter(struct kset *kset, struct kobject *kobj)
337 {
338         struct kobj_type *ktype = get_ktype(kobj);
339
340         if (ktype == &ktype_class_device) {
341                 struct class_device *class_dev = to_class_dev(kobj);
342                 if (class_dev->class)
343                         return 1;
344         }
345         return 0;
346 }
347
348 static const char *class_uevent_name(struct kset *kset, struct kobject *kobj)
349 {
350         struct class_device *class_dev = to_class_dev(kobj);
351
352         return class_dev->class->name;
353 }
354
355 #ifdef CONFIG_SYSFS_DEPRECATED
356 char *make_class_name(const char *name, struct kobject *kobj)
357 {
358         char *class_name;
359         int size;
360
361         size = strlen(name) + strlen(kobject_name(kobj)) + 2;
362
363         class_name = kmalloc(size, GFP_KERNEL);
364         if (!class_name)
365                 return ERR_PTR(-ENOMEM);
366
367         strcpy(class_name, name);
368         strcat(class_name, ":");
369         strcat(class_name, kobject_name(kobj));
370         return class_name;
371 }
372
373 static int deprecated_class_uevent(char **envp, int num_envp, int *cur_index,
374                                    char *buffer, int buffer_size,
375                                    int *cur_len,
376                                    struct class_device *class_dev)
377 {
378         struct device *dev = class_dev->dev;
379         char *path;
380
381         if (!dev)
382                 return 0;
383
384         /* add device, backing this class device (deprecated) */
385         path = kobject_get_path(&dev->kobj, GFP_KERNEL);
386
387         add_uevent_var(envp, num_envp, cur_index, buffer, buffer_size,
388                        cur_len, "PHYSDEVPATH=%s", path);
389         kfree(path);
390
391         if (dev->bus)
392                 add_uevent_var(envp, num_envp, cur_index,
393                                buffer, buffer_size, cur_len,
394                                "PHYSDEVBUS=%s", dev->bus->name);
395
396         if (dev->driver)
397                 add_uevent_var(envp, num_envp, cur_index,
398                                buffer, buffer_size, cur_len,
399                                "PHYSDEVDRIVER=%s", dev->driver->name);
400         return 0;
401 }
402
403 static int make_deprecated_class_device_links(struct class_device *class_dev)
404 {
405         char *class_name;
406         int error;
407
408         if (!class_dev->dev)
409                 return 0;
410
411         class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
412         error = sysfs_create_link(&class_dev->dev->kobj, &class_dev->kobj,
413                                   class_name);
414         kfree(class_name);
415         return error;
416 }
417
418 static void remove_deprecated_class_device_links(struct class_device *class_dev)
419 {
420         char *class_name;
421
422         if (!class_dev->dev)
423                 return;
424
425         class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
426         sysfs_remove_link(&class_dev->dev->kobj, class_name);
427         kfree(class_name);
428 }
429 #else
430 static inline int deprecated_class_uevent(char **envp, int num_envp,
431                                           int *cur_index, char *buffer,
432                                           int buffer_size, int *cur_len,
433                                           struct class_device *class_dev)
434 { return 0; }
435 static inline int make_deprecated_class_device_links(struct class_device *cd)
436 { return 0; }
437 static void remove_deprecated_class_device_links(struct class_device *cd)
438 { }
439 #endif
440
441 static int class_uevent(struct kset *kset, struct kobject *kobj, char **envp,
442                          int num_envp, char *buffer, int buffer_size)
443 {
444         struct class_device *class_dev = to_class_dev(kobj);
445         int i = 0;
446         int length = 0;
447         int retval = 0;
448
449         pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id);
450
451         deprecated_class_uevent(envp, num_envp, &i, buffer, buffer_size,
452                                 &length, class_dev);
453
454         if (MAJOR(class_dev->devt)) {
455                 add_uevent_var(envp, num_envp, &i,
456                                buffer, buffer_size, &length,
457                                "MAJOR=%u", MAJOR(class_dev->devt));
458
459                 add_uevent_var(envp, num_envp, &i,
460                                buffer, buffer_size, &length,
461                                "MINOR=%u", MINOR(class_dev->devt));
462         }
463
464         /* terminate, set to next free slot, shrink available space */
465         envp[i] = NULL;
466         envp = &envp[i];
467         num_envp -= i;
468         buffer = &buffer[length];
469         buffer_size -= length;
470
471         if (class_dev->uevent) {
472                 /* have the class device specific function add its stuff */
473                 retval = class_dev->uevent(class_dev, envp, num_envp,
474                                             buffer, buffer_size);
475                 if (retval)
476                         pr_debug("class_dev->uevent() returned %d\n", retval);
477         } else if (class_dev->class->uevent) {
478                 /* have the class specific function add its stuff */
479                 retval = class_dev->class->uevent(class_dev, envp, num_envp,
480                                                    buffer, buffer_size);
481                 if (retval)
482                         pr_debug("class->uevent() returned %d\n", retval);
483         }
484
485         return retval;
486 }
487
488 static struct kset_uevent_ops class_uevent_ops = {
489         .filter =       class_uevent_filter,
490         .name =         class_uevent_name,
491         .uevent =       class_uevent,
492 };
493
494 static decl_subsys(class_obj, &ktype_class_device, &class_uevent_ops);
495
496
497 static int class_device_add_attrs(struct class_device * cd)
498 {
499         int i;
500         int error = 0;
501         struct class * cls = cd->class;
502
503         if (cls->class_dev_attrs) {
504                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) {
505                         error = class_device_create_file(cd,
506                                                          &cls->class_dev_attrs[i]);
507                         if (error)
508                                 goto Err;
509                 }
510         }
511  Done:
512         return error;
513  Err:
514         while (--i >= 0)
515                 class_device_remove_file(cd,&cls->class_dev_attrs[i]);
516         goto Done;
517 }
518
519 static void class_device_remove_attrs(struct class_device * cd)
520 {
521         int i;
522         struct class * cls = cd->class;
523
524         if (cls->class_dev_attrs) {
525                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++)
526                         class_device_remove_file(cd,&cls->class_dev_attrs[i]);
527         }
528 }
529
530 static int class_device_add_groups(struct class_device * cd)
531 {
532         int i;
533         int error = 0;
534
535         if (cd->groups) {
536                 for (i = 0; cd->groups[i]; i++) {
537                         error = sysfs_create_group(&cd->kobj, cd->groups[i]);
538                         if (error) {
539                                 while (--i >= 0)
540                                         sysfs_remove_group(&cd->kobj, cd->groups[i]);
541                                 goto out;
542                         }
543                 }
544         }
545 out:
546         return error;
547 }
548
549 static void class_device_remove_groups(struct class_device * cd)
550 {
551         int i;
552         if (cd->groups) {
553                 for (i = 0; cd->groups[i]; i++) {
554                         sysfs_remove_group(&cd->kobj, cd->groups[i]);
555                 }
556         }
557 }
558
559 static ssize_t show_dev(struct class_device *class_dev, char *buf)
560 {
561         return print_dev_t(buf, class_dev->devt);
562 }
563
564 static ssize_t store_uevent(struct class_device *class_dev,
565                             const char *buf, size_t count)
566 {
567         kobject_uevent(&class_dev->kobj, KOBJ_ADD);
568         return count;
569 }
570
571 void class_device_initialize(struct class_device *class_dev)
572 {
573         kobj_set_kset_s(class_dev, class_obj_subsys);
574         kobject_init(&class_dev->kobj);
575         INIT_LIST_HEAD(&class_dev->node);
576 }
577
578 int class_device_add(struct class_device *class_dev)
579 {
580         struct class *parent_class = NULL;
581         struct class_device *parent_class_dev = NULL;
582         struct class_interface *class_intf;
583         int error = -EINVAL;
584
585         class_dev = class_device_get(class_dev);
586         if (!class_dev)
587                 return -EINVAL;
588
589         if (!strlen(class_dev->class_id))
590                 goto out1;
591
592         parent_class = class_get(class_dev->class);
593         if (!parent_class)
594                 goto out1;
595
596         parent_class_dev = class_device_get(class_dev->parent);
597
598         pr_debug("CLASS: registering class device: ID = '%s'\n",
599                  class_dev->class_id);
600
601         /* first, register with generic layer. */
602         error = kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
603         if (error)
604                 goto out2;
605
606         if (parent_class_dev)
607                 class_dev->kobj.parent = &parent_class_dev->kobj;
608         else
609                 class_dev->kobj.parent = &parent_class->subsys.kset.kobj;
610
611         error = kobject_add(&class_dev->kobj);
612         if (error)
613                 goto out2;
614
615         /* add the needed attributes to this device */
616         error = sysfs_create_link(&class_dev->kobj,
617                                   &parent_class->subsys.kset.kobj, "subsystem");
618         if (error)
619                 goto out3;
620         class_dev->uevent_attr.attr.name = "uevent";
621         class_dev->uevent_attr.attr.mode = S_IWUSR;
622         class_dev->uevent_attr.attr.owner = parent_class->owner;
623         class_dev->uevent_attr.store = store_uevent;
624         error = class_device_create_file(class_dev, &class_dev->uevent_attr);
625         if (error)
626                 goto out3;
627
628         if (MAJOR(class_dev->devt)) {
629                 struct class_device_attribute *attr;
630                 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
631                 if (!attr) {
632                         error = -ENOMEM;
633                         goto out4;
634                 }
635                 attr->attr.name = "dev";
636                 attr->attr.mode = S_IRUGO;
637                 attr->attr.owner = parent_class->owner;
638                 attr->show = show_dev;
639                 error = class_device_create_file(class_dev, attr);
640                 if (error) {
641                         kfree(attr);
642                         goto out4;
643                 }
644
645                 class_dev->devt_attr = attr;
646         }
647
648         error = class_device_add_attrs(class_dev);
649         if (error)
650                 goto out5;
651
652         if (class_dev->dev) {
653                 error = sysfs_create_link(&class_dev->kobj,
654                                           &class_dev->dev->kobj, "device");
655                 if (error)
656                         goto out6;
657         }
658
659         error = class_device_add_groups(class_dev);
660         if (error)
661                 goto out7;
662
663         error = make_deprecated_class_device_links(class_dev);
664         if (error)
665                 goto out8;
666
667         kobject_uevent(&class_dev->kobj, KOBJ_ADD);
668
669         /* notify any interfaces this device is now here */
670         down(&parent_class->sem);
671         list_add_tail(&class_dev->node, &parent_class->children);
672         list_for_each_entry(class_intf, &parent_class->interfaces, node) {
673                 if (class_intf->add)
674                         class_intf->add(class_dev, class_intf);
675         }
676         up(&parent_class->sem);
677
678         goto out1;
679
680  out8:
681         class_device_remove_groups(class_dev);
682  out7:
683         if (class_dev->dev)
684                 sysfs_remove_link(&class_dev->kobj, "device");
685  out6:
686         class_device_remove_attrs(class_dev);
687  out5:
688         if (class_dev->devt_attr)
689                 class_device_remove_file(class_dev, class_dev->devt_attr);
690  out4:
691         class_device_remove_file(class_dev, &class_dev->uevent_attr);
692  out3:
693         kobject_del(&class_dev->kobj);
694  out2:
695         if(parent_class_dev)
696                 class_device_put(parent_class_dev);
697         class_put(parent_class);
698  out1:
699         class_device_put(class_dev);
700         return error;
701 }
702
703 int class_device_register(struct class_device *class_dev)
704 {
705         class_device_initialize(class_dev);
706         return class_device_add(class_dev);
707 }
708
709 /**
710  * class_device_create - creates a class device and registers it with sysfs
711  * @cls: pointer to the struct class that this device should be registered to.
712  * @parent: pointer to the parent struct class_device of this new device, if any.
713  * @devt: the dev_t for the char device to be added.
714  * @device: a pointer to a struct device that is assiociated with this class device.
715  * @fmt: string for the class device's name
716  *
717  * This function can be used by char device classes.  A struct
718  * class_device will be created in sysfs, registered to the specified
719  * class.
720  * A "dev" file will be created, showing the dev_t for the device, if
721  * the dev_t is not 0,0.
722  * If a pointer to a parent struct class_device is passed in, the newly
723  * created struct class_device will be a child of that device in sysfs.
724  * The pointer to the struct class_device will be returned from the
725  * call.  Any further sysfs files that might be required can be created
726  * using this pointer.
727  *
728  * Note: the struct class passed to this function must have previously
729  * been created with a call to class_create().
730  */
731 struct class_device *class_device_create(struct class *cls,
732                                          struct class_device *parent,
733                                          dev_t devt,
734                                          struct device *device,
735                                          const char *fmt, ...)
736 {
737         va_list args;
738         struct class_device *class_dev = NULL;
739         int retval = -ENODEV;
740
741         if (cls == NULL || IS_ERR(cls))
742                 goto error;
743
744         class_dev = kzalloc(sizeof(*class_dev), GFP_KERNEL);
745         if (!class_dev) {
746                 retval = -ENOMEM;
747                 goto error;
748         }
749
750         class_dev->devt = devt;
751         class_dev->dev = device;
752         class_dev->class = cls;
753         class_dev->parent = parent;
754         class_dev->release = class_device_create_release;
755         class_dev->uevent = class_device_create_uevent;
756
757         va_start(args, fmt);
758         vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args);
759         va_end(args);
760         retval = class_device_register(class_dev);
761         if (retval)
762                 goto error;
763
764         return class_dev;
765
766 error:
767         kfree(class_dev);
768         return ERR_PTR(retval);
769 }
770
771 void class_device_del(struct class_device *class_dev)
772 {
773         struct class *parent_class = class_dev->class;
774         struct class_device *parent_device = class_dev->parent;
775         struct class_interface *class_intf;
776
777         if (parent_class) {
778                 down(&parent_class->sem);
779                 list_del_init(&class_dev->node);
780                 list_for_each_entry(class_intf, &parent_class->interfaces, node)
781                         if (class_intf->remove)
782                                 class_intf->remove(class_dev, class_intf);
783                 up(&parent_class->sem);
784         }
785
786         if (class_dev->dev) {
787                 remove_deprecated_class_device_links(class_dev);
788                 sysfs_remove_link(&class_dev->kobj, "device");
789         }
790         sysfs_remove_link(&class_dev->kobj, "subsystem");
791         class_device_remove_file(class_dev, &class_dev->uevent_attr);
792         if (class_dev->devt_attr)
793                 class_device_remove_file(class_dev, class_dev->devt_attr);
794         class_device_remove_attrs(class_dev);
795         class_device_remove_groups(class_dev);
796
797         kobject_uevent(&class_dev->kobj, KOBJ_REMOVE);
798         kobject_del(&class_dev->kobj);
799
800         class_device_put(parent_device);
801         class_put(parent_class);
802 }
803
804 void class_device_unregister(struct class_device *class_dev)
805 {
806         pr_debug("CLASS: Unregistering class device. ID = '%s'\n",
807                  class_dev->class_id);
808         class_device_del(class_dev);
809         class_device_put(class_dev);
810 }
811
812 /**
813  * class_device_destroy - removes a class device that was created with class_device_create()
814  * @cls: the pointer to the struct class that this device was registered * with.
815  * @devt: the dev_t of the device that was previously registered.
816  *
817  * This call unregisters and cleans up a class device that was created with a
818  * call to class_device_create()
819  */
820 void class_device_destroy(struct class *cls, dev_t devt)
821 {
822         struct class_device *class_dev = NULL;
823         struct class_device *class_dev_tmp;
824
825         down(&cls->sem);
826         list_for_each_entry(class_dev_tmp, &cls->children, node) {
827                 if (class_dev_tmp->devt == devt) {
828                         class_dev = class_dev_tmp;
829                         break;
830                 }
831         }
832         up(&cls->sem);
833
834         if (class_dev)
835                 class_device_unregister(class_dev);
836 }
837
838 int class_device_rename(struct class_device *class_dev, char *new_name)
839 {
840         int error = 0;
841         char *old_class_name = NULL, *new_class_name = NULL;
842
843         class_dev = class_device_get(class_dev);
844         if (!class_dev)
845                 return -EINVAL;
846
847         pr_debug("CLASS: renaming '%s' to '%s'\n", class_dev->class_id,
848                  new_name);
849
850 #ifdef CONFIG_SYSFS_DEPRECATED
851         if (class_dev->dev)
852                 old_class_name = make_class_name(class_dev->class->name,
853                                                  &class_dev->kobj);
854 #endif
855
856         strlcpy(class_dev->class_id, new_name, KOBJ_NAME_LEN);
857
858         error = kobject_rename(&class_dev->kobj, new_name);
859
860 #ifdef CONFIG_SYSFS_DEPRECATED
861         if (class_dev->dev) {
862                 new_class_name = make_class_name(class_dev->class->name,
863                                                  &class_dev->kobj);
864                 sysfs_create_link(&class_dev->dev->kobj, &class_dev->kobj,
865                                   new_class_name);
866                 sysfs_remove_link(&class_dev->dev->kobj, old_class_name);
867         }
868 #endif
869         class_device_put(class_dev);
870
871         kfree(old_class_name);
872         kfree(new_class_name);
873
874         return error;
875 }
876
877 struct class_device * class_device_get(struct class_device *class_dev)
878 {
879         if (class_dev)
880                 return to_class_dev(kobject_get(&class_dev->kobj));
881         return NULL;
882 }
883
884 void class_device_put(struct class_device *class_dev)
885 {
886         if (class_dev)
887                 kobject_put(&class_dev->kobj);
888 }
889
890
891 int class_interface_register(struct class_interface *class_intf)
892 {
893         struct class *parent;
894         struct class_device *class_dev;
895         struct device *dev;
896
897         if (!class_intf || !class_intf->class)
898                 return -ENODEV;
899
900         parent = class_get(class_intf->class);
901         if (!parent)
902                 return -EINVAL;
903
904         down(&parent->sem);
905         list_add_tail(&class_intf->node, &parent->interfaces);
906         if (class_intf->add) {
907                 list_for_each_entry(class_dev, &parent->children, node)
908                         class_intf->add(class_dev, class_intf);
909         }
910         if (class_intf->add_dev) {
911                 list_for_each_entry(dev, &parent->devices, node)
912                         class_intf->add_dev(dev, class_intf);
913         }
914         up(&parent->sem);
915
916         return 0;
917 }
918
919 void class_interface_unregister(struct class_interface *class_intf)
920 {
921         struct class * parent = class_intf->class;
922         struct class_device *class_dev;
923         struct device *dev;
924
925         if (!parent)
926                 return;
927
928         down(&parent->sem);
929         list_del_init(&class_intf->node);
930         if (class_intf->remove) {
931                 list_for_each_entry(class_dev, &parent->children, node)
932                         class_intf->remove(class_dev, class_intf);
933         }
934         if (class_intf->remove_dev) {
935                 list_for_each_entry(dev, &parent->devices, node)
936                         class_intf->remove_dev(dev, class_intf);
937         }
938         up(&parent->sem);
939
940         class_put(parent);
941 }
942
943 int __init classes_init(void)
944 {
945         int retval;
946
947         retval = subsystem_register(&class_subsys);
948         if (retval)
949                 return retval;
950
951         /* ick, this is ugly, the things we go through to keep from showing up
952          * in sysfs... */
953         subsystem_init(&class_obj_subsys);
954         if (!class_obj_subsys.kset.subsys)
955                         class_obj_subsys.kset.subsys = &class_obj_subsys;
956         return 0;
957 }
958
959 EXPORT_SYMBOL_GPL(class_create_file);
960 EXPORT_SYMBOL_GPL(class_remove_file);
961 EXPORT_SYMBOL_GPL(class_register);
962 EXPORT_SYMBOL_GPL(class_unregister);
963 EXPORT_SYMBOL_GPL(class_create);
964 EXPORT_SYMBOL_GPL(class_destroy);
965
966 EXPORT_SYMBOL_GPL(class_device_register);
967 EXPORT_SYMBOL_GPL(class_device_unregister);
968 EXPORT_SYMBOL_GPL(class_device_initialize);
969 EXPORT_SYMBOL_GPL(class_device_add);
970 EXPORT_SYMBOL_GPL(class_device_del);
971 EXPORT_SYMBOL_GPL(class_device_get);
972 EXPORT_SYMBOL_GPL(class_device_put);
973 EXPORT_SYMBOL_GPL(class_device_create);
974 EXPORT_SYMBOL_GPL(class_device_destroy);
975 EXPORT_SYMBOL_GPL(class_device_create_file);
976 EXPORT_SYMBOL_GPL(class_device_remove_file);
977 EXPORT_SYMBOL_GPL(class_device_create_bin_file);
978 EXPORT_SYMBOL_GPL(class_device_remove_bin_file);
979
980 EXPORT_SYMBOL_GPL(class_interface_register);
981 EXPORT_SYMBOL_GPL(class_interface_unregister);