Class: add support for class interfaces for devices
[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  * @cs: 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 static int class_uevent(struct kset *kset, struct kobject *kobj, char **envp,
356                          int num_envp, char *buffer, int buffer_size)
357 {
358         struct class_device *class_dev = to_class_dev(kobj);
359         int i = 0;
360         int length = 0;
361         int retval = 0;
362
363         pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id);
364
365         if (class_dev->dev) {
366                 /* add device, backing this class device (deprecated) */
367                 struct device *dev = class_dev->dev;
368                 char *path = kobject_get_path(&dev->kobj, GFP_KERNEL);
369
370                 add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
371                                &length, "PHYSDEVPATH=%s", path);
372                 kfree(path);
373
374                 if (dev->bus)
375                         add_uevent_var(envp, num_envp, &i,
376                                        buffer, buffer_size, &length,
377                                        "PHYSDEVBUS=%s", dev->bus->name);
378
379                 if (dev->driver)
380                         add_uevent_var(envp, num_envp, &i,
381                                        buffer, buffer_size, &length,
382                                        "PHYSDEVDRIVER=%s", dev->driver->name);
383         }
384
385         if (MAJOR(class_dev->devt)) {
386                 add_uevent_var(envp, num_envp, &i,
387                                buffer, buffer_size, &length,
388                                "MAJOR=%u", MAJOR(class_dev->devt));
389
390                 add_uevent_var(envp, num_envp, &i,
391                                buffer, buffer_size, &length,
392                                "MINOR=%u", MINOR(class_dev->devt));
393         }
394
395         /* terminate, set to next free slot, shrink available space */
396         envp[i] = NULL;
397         envp = &envp[i];
398         num_envp -= i;
399         buffer = &buffer[length];
400         buffer_size -= length;
401
402         if (class_dev->uevent) {
403                 /* have the class device specific function add its stuff */
404                 retval = class_dev->uevent(class_dev, envp, num_envp,
405                                             buffer, buffer_size);
406                 if (retval)
407                         pr_debug("class_dev->uevent() returned %d\n", retval);
408         } else if (class_dev->class->uevent) {
409                 /* have the class specific function add its stuff */
410                 retval = class_dev->class->uevent(class_dev, envp, num_envp,
411                                                    buffer, buffer_size);
412                 if (retval)
413                         pr_debug("class->uevent() returned %d\n", retval);
414         }
415
416         return retval;
417 }
418
419 static struct kset_uevent_ops class_uevent_ops = {
420         .filter =       class_uevent_filter,
421         .name =         class_uevent_name,
422         .uevent =       class_uevent,
423 };
424
425 static decl_subsys(class_obj, &ktype_class_device, &class_uevent_ops);
426
427
428 static int class_device_add_attrs(struct class_device * cd)
429 {
430         int i;
431         int error = 0;
432         struct class * cls = cd->class;
433
434         if (cls->class_dev_attrs) {
435                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) {
436                         error = class_device_create_file(cd,
437                                                          &cls->class_dev_attrs[i]);
438                         if (error)
439                                 goto Err;
440                 }
441         }
442  Done:
443         return error;
444  Err:
445         while (--i >= 0)
446                 class_device_remove_file(cd,&cls->class_dev_attrs[i]);
447         goto Done;
448 }
449
450 static void class_device_remove_attrs(struct class_device * cd)
451 {
452         int i;
453         struct class * cls = cd->class;
454
455         if (cls->class_dev_attrs) {
456                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++)
457                         class_device_remove_file(cd,&cls->class_dev_attrs[i]);
458         }
459 }
460
461 static int class_device_add_groups(struct class_device * cd)
462 {
463         int i;
464         int error = 0;
465
466         if (cd->groups) {
467                 for (i = 0; cd->groups[i]; i++) {
468                         error = sysfs_create_group(&cd->kobj, cd->groups[i]);
469                         if (error) {
470                                 while (--i >= 0)
471                                         sysfs_remove_group(&cd->kobj, cd->groups[i]);
472                                 goto out;
473                         }
474                 }
475         }
476 out:
477         return error;
478 }
479
480 static void class_device_remove_groups(struct class_device * cd)
481 {
482         int i;
483         if (cd->groups) {
484                 for (i = 0; cd->groups[i]; i++) {
485                         sysfs_remove_group(&cd->kobj, cd->groups[i]);
486                 }
487         }
488 }
489
490 static ssize_t show_dev(struct class_device *class_dev, char *buf)
491 {
492         return print_dev_t(buf, class_dev->devt);
493 }
494
495 static ssize_t store_uevent(struct class_device *class_dev,
496                             const char *buf, size_t count)
497 {
498         kobject_uevent(&class_dev->kobj, KOBJ_ADD);
499         return count;
500 }
501
502 void class_device_initialize(struct class_device *class_dev)
503 {
504         kobj_set_kset_s(class_dev, class_obj_subsys);
505         kobject_init(&class_dev->kobj);
506         INIT_LIST_HEAD(&class_dev->node);
507 }
508
509 char *make_class_name(const char *name, struct kobject *kobj)
510 {
511         char *class_name;
512         int size;
513
514         size = strlen(name) + strlen(kobject_name(kobj)) + 2;
515
516         class_name = kmalloc(size, GFP_KERNEL);
517         if (!class_name)
518                 return ERR_PTR(-ENOMEM);
519
520         strcpy(class_name, name);
521         strcat(class_name, ":");
522         strcat(class_name, kobject_name(kobj));
523         return class_name;
524 }
525
526 int class_device_add(struct class_device *class_dev)
527 {
528         struct class *parent_class = NULL;
529         struct class_device *parent_class_dev = NULL;
530         struct class_interface *class_intf;
531         char *class_name = NULL;
532         int error = -EINVAL;
533
534         class_dev = class_device_get(class_dev);
535         if (!class_dev)
536                 return -EINVAL;
537
538         if (!strlen(class_dev->class_id))
539                 goto out1;
540
541         parent_class = class_get(class_dev->class);
542         if (!parent_class)
543                 goto out1;
544
545         parent_class_dev = class_device_get(class_dev->parent);
546
547         pr_debug("CLASS: registering class device: ID = '%s'\n",
548                  class_dev->class_id);
549
550         /* first, register with generic layer. */
551         error = kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
552         if (error)
553                 goto out2;
554
555         if (parent_class_dev)
556                 class_dev->kobj.parent = &parent_class_dev->kobj;
557         else
558                 class_dev->kobj.parent = &parent_class->subsys.kset.kobj;
559
560         error = kobject_add(&class_dev->kobj);
561         if (error)
562                 goto out2;
563
564         /* add the needed attributes to this device */
565         sysfs_create_link(&class_dev->kobj, &parent_class->subsys.kset.kobj, "subsystem");
566         class_dev->uevent_attr.attr.name = "uevent";
567         class_dev->uevent_attr.attr.mode = S_IWUSR;
568         class_dev->uevent_attr.attr.owner = parent_class->owner;
569         class_dev->uevent_attr.store = store_uevent;
570         error = class_device_create_file(class_dev, &class_dev->uevent_attr);
571         if (error)
572                 goto out3;
573
574         if (MAJOR(class_dev->devt)) {
575                 struct class_device_attribute *attr;
576                 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
577                 if (!attr) {
578                         error = -ENOMEM;
579                         goto out4;
580                 }
581                 attr->attr.name = "dev";
582                 attr->attr.mode = S_IRUGO;
583                 attr->attr.owner = parent_class->owner;
584                 attr->show = show_dev;
585                 error = class_device_create_file(class_dev, attr);
586                 if (error) {
587                         kfree(attr);
588                         goto out4;
589                 }
590
591                 class_dev->devt_attr = attr;
592         }
593
594         error = class_device_add_attrs(class_dev);
595         if (error)
596                 goto out5;
597
598         if (class_dev->dev) {
599                 class_name = make_class_name(class_dev->class->name,
600                                              &class_dev->kobj);
601                 error = sysfs_create_link(&class_dev->kobj,
602                                           &class_dev->dev->kobj, "device");
603                 if (error)
604                         goto out6;
605                 error = sysfs_create_link(&class_dev->dev->kobj, &class_dev->kobj,
606                                           class_name);
607                 if (error)
608                         goto out7;
609         }
610
611         error = class_device_add_groups(class_dev);
612         if (error)
613                 goto out8;
614
615         kobject_uevent(&class_dev->kobj, KOBJ_ADD);
616
617         /* notify any interfaces this device is now here */
618         down(&parent_class->sem);
619         list_add_tail(&class_dev->node, &parent_class->children);
620         list_for_each_entry(class_intf, &parent_class->interfaces, node) {
621                 if (class_intf->add)
622                         class_intf->add(class_dev, class_intf);
623         }
624         up(&parent_class->sem);
625
626         goto out1;
627
628  out8:
629         if (class_dev->dev)
630                 sysfs_remove_link(&class_dev->kobj, class_name);
631  out7:
632         if (class_dev->dev)
633                 sysfs_remove_link(&class_dev->kobj, "device");
634  out6:
635         class_device_remove_attrs(class_dev);
636  out5:
637         if (class_dev->devt_attr)
638                 class_device_remove_file(class_dev, class_dev->devt_attr);
639  out4:
640         class_device_remove_file(class_dev, &class_dev->uevent_attr);
641  out3:
642         kobject_del(&class_dev->kobj);
643  out2:
644         if(parent_class_dev)
645                 class_device_put(parent_class_dev);
646         class_put(parent_class);
647  out1:
648         class_device_put(class_dev);
649         kfree(class_name);
650         return error;
651 }
652
653 int class_device_register(struct class_device *class_dev)
654 {
655         class_device_initialize(class_dev);
656         return class_device_add(class_dev);
657 }
658
659 /**
660  * class_device_create - creates a class device and registers it with sysfs
661  * @cs: pointer to the struct class that this device should be registered to.
662  * @parent: pointer to the parent struct class_device of this new device, if any.
663  * @dev: the dev_t for the char device to be added.
664  * @device: a pointer to a struct device that is assiociated with this class device.
665  * @fmt: string for the class device's name
666  *
667  * This function can be used by char device classes.  A struct
668  * class_device will be created in sysfs, registered to the specified
669  * class.
670  * A "dev" file will be created, showing the dev_t for the device, if
671  * the dev_t is not 0,0.
672  * If a pointer to a parent struct class_device is passed in, the newly
673  * created struct class_device will be a child of that device in sysfs.
674  * The pointer to the struct class_device will be returned from the
675  * call.  Any further sysfs files that might be required can be created
676  * using this pointer.
677  *
678  * Note: the struct class passed to this function must have previously
679  * been created with a call to class_create().
680  */
681 struct class_device *class_device_create(struct class *cls,
682                                          struct class_device *parent,
683                                          dev_t devt,
684                                          struct device *device,
685                                          const char *fmt, ...)
686 {
687         va_list args;
688         struct class_device *class_dev = NULL;
689         int retval = -ENODEV;
690
691         if (cls == NULL || IS_ERR(cls))
692                 goto error;
693
694         class_dev = kzalloc(sizeof(*class_dev), GFP_KERNEL);
695         if (!class_dev) {
696                 retval = -ENOMEM;
697                 goto error;
698         }
699
700         class_dev->devt = devt;
701         class_dev->dev = device;
702         class_dev->class = cls;
703         class_dev->parent = parent;
704         class_dev->release = class_device_create_release;
705         class_dev->uevent = class_device_create_uevent;
706
707         va_start(args, fmt);
708         vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args);
709         va_end(args);
710         retval = class_device_register(class_dev);
711         if (retval)
712                 goto error;
713
714         return class_dev;
715
716 error:
717         kfree(class_dev);
718         return ERR_PTR(retval);
719 }
720
721 void class_device_del(struct class_device *class_dev)
722 {
723         struct class *parent_class = class_dev->class;
724         struct class_device *parent_device = class_dev->parent;
725         struct class_interface *class_intf;
726         char *class_name = NULL;
727
728         if (parent_class) {
729                 down(&parent_class->sem);
730                 list_del_init(&class_dev->node);
731                 list_for_each_entry(class_intf, &parent_class->interfaces, node)
732                         if (class_intf->remove)
733                                 class_intf->remove(class_dev, class_intf);
734                 up(&parent_class->sem);
735         }
736
737         if (class_dev->dev) {
738                 class_name = make_class_name(class_dev->class->name,
739                                              &class_dev->kobj);
740                 sysfs_remove_link(&class_dev->kobj, "device");
741                 sysfs_remove_link(&class_dev->dev->kobj, class_name);
742         }
743         sysfs_remove_link(&class_dev->kobj, "subsystem");
744         class_device_remove_file(class_dev, &class_dev->uevent_attr);
745         if (class_dev->devt_attr)
746                 class_device_remove_file(class_dev, class_dev->devt_attr);
747         class_device_remove_attrs(class_dev);
748         class_device_remove_groups(class_dev);
749
750         kobject_uevent(&class_dev->kobj, KOBJ_REMOVE);
751         kobject_del(&class_dev->kobj);
752
753         class_device_put(parent_device);
754         class_put(parent_class);
755         kfree(class_name);
756 }
757
758 void class_device_unregister(struct class_device *class_dev)
759 {
760         pr_debug("CLASS: Unregistering class device. ID = '%s'\n",
761                  class_dev->class_id);
762         class_device_del(class_dev);
763         class_device_put(class_dev);
764 }
765
766 /**
767  * class_device_destroy - removes a class device that was created with class_device_create()
768  * @cls: the pointer to the struct class that this device was registered * with.
769  * @dev: the dev_t of the device that was previously registered.
770  *
771  * This call unregisters and cleans up a class device that was created with a
772  * call to class_device_create()
773  */
774 void class_device_destroy(struct class *cls, dev_t devt)
775 {
776         struct class_device *class_dev = NULL;
777         struct class_device *class_dev_tmp;
778
779         down(&cls->sem);
780         list_for_each_entry(class_dev_tmp, &cls->children, node) {
781                 if (class_dev_tmp->devt == devt) {
782                         class_dev = class_dev_tmp;
783                         break;
784                 }
785         }
786         up(&cls->sem);
787
788         if (class_dev)
789                 class_device_unregister(class_dev);
790 }
791
792 int class_device_rename(struct class_device *class_dev, char *new_name)
793 {
794         int error = 0;
795         char *old_class_name = NULL, *new_class_name = NULL;
796
797         class_dev = class_device_get(class_dev);
798         if (!class_dev)
799                 return -EINVAL;
800
801         pr_debug("CLASS: renaming '%s' to '%s'\n", class_dev->class_id,
802                  new_name);
803
804         if (class_dev->dev)
805                 old_class_name = make_class_name(class_dev->class->name,
806                                                  &class_dev->kobj);
807
808         strlcpy(class_dev->class_id, new_name, KOBJ_NAME_LEN);
809
810         error = kobject_rename(&class_dev->kobj, new_name);
811
812         if (class_dev->dev) {
813                 new_class_name = make_class_name(class_dev->class->name,
814                                                  &class_dev->kobj);
815                 sysfs_create_link(&class_dev->dev->kobj, &class_dev->kobj,
816                                   new_class_name);
817                 sysfs_remove_link(&class_dev->dev->kobj, old_class_name);
818         }
819         class_device_put(class_dev);
820
821         kfree(old_class_name);
822         kfree(new_class_name);
823
824         return error;
825 }
826
827 struct class_device * class_device_get(struct class_device *class_dev)
828 {
829         if (class_dev)
830                 return to_class_dev(kobject_get(&class_dev->kobj));
831         return NULL;
832 }
833
834 void class_device_put(struct class_device *class_dev)
835 {
836         if (class_dev)
837                 kobject_put(&class_dev->kobj);
838 }
839
840
841 int class_interface_register(struct class_interface *class_intf)
842 {
843         struct class *parent;
844         struct class_device *class_dev;
845         struct device *dev;
846
847         if (!class_intf || !class_intf->class)
848                 return -ENODEV;
849
850         parent = class_get(class_intf->class);
851         if (!parent)
852                 return -EINVAL;
853
854         down(&parent->sem);
855         list_add_tail(&class_intf->node, &parent->interfaces);
856         if (class_intf->add) {
857                 list_for_each_entry(class_dev, &parent->children, node)
858                         class_intf->add(class_dev, class_intf);
859         }
860         if (class_intf->add_dev) {
861                 list_for_each_entry(dev, &parent->devices, node)
862                         class_intf->add_dev(dev, class_intf);
863         }
864         up(&parent->sem);
865
866         return 0;
867 }
868
869 void class_interface_unregister(struct class_interface *class_intf)
870 {
871         struct class * parent = class_intf->class;
872         struct class_device *class_dev;
873         struct device *dev;
874
875         if (!parent)
876                 return;
877
878         down(&parent->sem);
879         list_del_init(&class_intf->node);
880         if (class_intf->remove) {
881                 list_for_each_entry(class_dev, &parent->children, node)
882                         class_intf->remove(class_dev, class_intf);
883         }
884         if (class_intf->remove_dev) {
885                 list_for_each_entry(dev, &parent->devices, node)
886                         class_intf->remove_dev(dev, class_intf);
887         }
888         up(&parent->sem);
889
890         class_put(parent);
891 }
892
893 int virtual_device_parent(struct device *dev)
894 {
895         if (!dev->class)
896                 return -ENODEV;
897
898         if (!dev->class->virtual_dir) {
899                 static struct kobject *virtual_dir = NULL;
900
901                 if (!virtual_dir)
902                         virtual_dir = kobject_add_dir(&devices_subsys.kset.kobj, "virtual");
903                 dev->class->virtual_dir = kobject_add_dir(virtual_dir, dev->class->name);
904         }
905
906         dev->kobj.parent = dev->class->virtual_dir;
907         return 0;
908 }
909
910 int __init classes_init(void)
911 {
912         int retval;
913
914         retval = subsystem_register(&class_subsys);
915         if (retval)
916                 return retval;
917
918         /* ick, this is ugly, the things we go through to keep from showing up
919          * in sysfs... */
920         subsystem_init(&class_obj_subsys);
921         if (!class_obj_subsys.kset.subsys)
922                         class_obj_subsys.kset.subsys = &class_obj_subsys;
923         return 0;
924 }
925
926 EXPORT_SYMBOL_GPL(class_create_file);
927 EXPORT_SYMBOL_GPL(class_remove_file);
928 EXPORT_SYMBOL_GPL(class_register);
929 EXPORT_SYMBOL_GPL(class_unregister);
930 EXPORT_SYMBOL_GPL(class_create);
931 EXPORT_SYMBOL_GPL(class_destroy);
932
933 EXPORT_SYMBOL_GPL(class_device_register);
934 EXPORT_SYMBOL_GPL(class_device_unregister);
935 EXPORT_SYMBOL_GPL(class_device_initialize);
936 EXPORT_SYMBOL_GPL(class_device_add);
937 EXPORT_SYMBOL_GPL(class_device_del);
938 EXPORT_SYMBOL_GPL(class_device_get);
939 EXPORT_SYMBOL_GPL(class_device_put);
940 EXPORT_SYMBOL_GPL(class_device_create);
941 EXPORT_SYMBOL_GPL(class_device_destroy);
942 EXPORT_SYMBOL_GPL(class_device_create_file);
943 EXPORT_SYMBOL_GPL(class_device_remove_file);
944 EXPORT_SYMBOL_GPL(class_device_create_bin_file);
945 EXPORT_SYMBOL_GPL(class_device_remove_bin_file);
946
947 EXPORT_SYMBOL_GPL(class_interface_register);
948 EXPORT_SYMBOL_GPL(class_interface_unregister);