driver core fixes: make_class_name() retval checks
[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         if (cls->virtual_dir)
167                 kobject_unregister(cls->virtual_dir);
168         remove_class_attrs(cls);
169         subsystem_unregister(&cls->subsys);
170 }
171
172 static void class_create_release(struct class *cls)
173 {
174         pr_debug("%s called for %s\n", __FUNCTION__, cls->name);
175         kfree(cls);
176 }
177
178 static void class_device_create_release(struct class_device *class_dev)
179 {
180         pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id);
181         kfree(class_dev);
182 }
183
184 /* needed to allow these devices to have parent class devices */
185 static int class_device_create_uevent(struct class_device *class_dev,
186                                        char **envp, int num_envp,
187                                        char *buffer, int buffer_size)
188 {
189         pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id);
190         return 0;
191 }
192
193 /**
194  * class_create - create a struct class structure
195  * @owner: pointer to the module that is to "own" this struct class
196  * @name: pointer to a string for the name of this class.
197  *
198  * This is used to create a struct class pointer that can then be used
199  * in calls to class_device_create().
200  *
201  * Note, the pointer created here is to be destroyed when finished by
202  * making a call to class_destroy().
203  */
204 struct class *class_create(struct module *owner, const char *name)
205 {
206         struct class *cls;
207         int retval;
208
209         cls = kzalloc(sizeof(*cls), GFP_KERNEL);
210         if (!cls) {
211                 retval = -ENOMEM;
212                 goto error;
213         }
214
215         cls->name = name;
216         cls->owner = owner;
217         cls->class_release = class_create_release;
218         cls->release = class_device_create_release;
219
220         retval = class_register(cls);
221         if (retval)
222                 goto error;
223
224         return cls;
225
226 error:
227         kfree(cls);
228         return ERR_PTR(retval);
229 }
230
231 /**
232  * class_destroy - destroys a struct class structure
233  * @cls: pointer to the struct class that is to be destroyed
234  *
235  * Note, the pointer to be destroyed must have been created with a call
236  * to class_create().
237  */
238 void class_destroy(struct class *cls)
239 {
240         if ((cls == NULL) || (IS_ERR(cls)))
241                 return;
242
243         class_unregister(cls);
244 }
245
246 /* Class Device Stuff */
247
248 int class_device_create_file(struct class_device * class_dev,
249                              const struct class_device_attribute * attr)
250 {
251         int error = -EINVAL;
252         if (class_dev)
253                 error = sysfs_create_file(&class_dev->kobj, &attr->attr);
254         return error;
255 }
256
257 void class_device_remove_file(struct class_device * class_dev,
258                               const struct class_device_attribute * attr)
259 {
260         if (class_dev)
261                 sysfs_remove_file(&class_dev->kobj, &attr->attr);
262 }
263
264 int class_device_create_bin_file(struct class_device *class_dev,
265                                  struct bin_attribute *attr)
266 {
267         int error = -EINVAL;
268         if (class_dev)
269                 error = sysfs_create_bin_file(&class_dev->kobj, attr);
270         return error;
271 }
272
273 void class_device_remove_bin_file(struct class_device *class_dev,
274                                   struct bin_attribute *attr)
275 {
276         if (class_dev)
277                 sysfs_remove_bin_file(&class_dev->kobj, attr);
278 }
279
280 static ssize_t
281 class_device_attr_show(struct kobject * kobj, struct attribute * attr,
282                        char * buf)
283 {
284         struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
285         struct class_device * cd = to_class_dev(kobj);
286         ssize_t ret = 0;
287
288         if (class_dev_attr->show)
289                 ret = class_dev_attr->show(cd, buf);
290         return ret;
291 }
292
293 static ssize_t
294 class_device_attr_store(struct kobject * kobj, struct attribute * attr,
295                         const char * buf, size_t count)
296 {
297         struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
298         struct class_device * cd = to_class_dev(kobj);
299         ssize_t ret = 0;
300
301         if (class_dev_attr->store)
302                 ret = class_dev_attr->store(cd, buf, count);
303         return ret;
304 }
305
306 static struct sysfs_ops class_dev_sysfs_ops = {
307         .show   = class_device_attr_show,
308         .store  = class_device_attr_store,
309 };
310
311 static void class_dev_release(struct kobject * kobj)
312 {
313         struct class_device *cd = to_class_dev(kobj);
314         struct class * cls = cd->class;
315
316         pr_debug("device class '%s': release.\n", cd->class_id);
317
318         kfree(cd->devt_attr);
319         cd->devt_attr = NULL;
320
321         if (cd->release)
322                 cd->release(cd);
323         else if (cls->release)
324                 cls->release(cd);
325         else {
326                 printk(KERN_ERR "Class Device '%s' does not have a release() function, "
327                         "it is broken and must be fixed.\n",
328                         cd->class_id);
329                 WARN_ON(1);
330         }
331 }
332
333 static struct kobj_type ktype_class_device = {
334         .sysfs_ops      = &class_dev_sysfs_ops,
335         .release        = class_dev_release,
336 };
337
338 static int class_uevent_filter(struct kset *kset, struct kobject *kobj)
339 {
340         struct kobj_type *ktype = get_ktype(kobj);
341
342         if (ktype == &ktype_class_device) {
343                 struct class_device *class_dev = to_class_dev(kobj);
344                 if (class_dev->class)
345                         return 1;
346         }
347         return 0;
348 }
349
350 static const char *class_uevent_name(struct kset *kset, struct kobject *kobj)
351 {
352         struct class_device *class_dev = to_class_dev(kobj);
353
354         return class_dev->class->name;
355 }
356
357 #ifdef CONFIG_SYSFS_DEPRECATED
358 char *make_class_name(const char *name, struct kobject *kobj)
359 {
360         char *class_name;
361         int size;
362
363         size = strlen(name) + strlen(kobject_name(kobj)) + 2;
364
365         class_name = kmalloc(size, GFP_KERNEL);
366         if (!class_name)
367                 return NULL;
368
369         strcpy(class_name, name);
370         strcat(class_name, ":");
371         strcat(class_name, kobject_name(kobj));
372         return class_name;
373 }
374
375 static int deprecated_class_uevent(char **envp, int num_envp, int *cur_index,
376                                    char *buffer, int buffer_size,
377                                    int *cur_len,
378                                    struct class_device *class_dev)
379 {
380         struct device *dev = class_dev->dev;
381         char *path;
382
383         if (!dev)
384                 return 0;
385
386         /* add device, backing this class device (deprecated) */
387         path = kobject_get_path(&dev->kobj, GFP_KERNEL);
388
389         add_uevent_var(envp, num_envp, cur_index, buffer, buffer_size,
390                        cur_len, "PHYSDEVPATH=%s", path);
391         kfree(path);
392
393         if (dev->bus)
394                 add_uevent_var(envp, num_envp, cur_index,
395                                buffer, buffer_size, cur_len,
396                                "PHYSDEVBUS=%s", dev->bus->name);
397
398         if (dev->driver)
399                 add_uevent_var(envp, num_envp, cur_index,
400                                buffer, buffer_size, cur_len,
401                                "PHYSDEVDRIVER=%s", dev->driver->name);
402         return 0;
403 }
404
405 static int make_deprecated_class_device_links(struct class_device *class_dev)
406 {
407         char *class_name;
408         int error;
409
410         if (!class_dev->dev)
411                 return 0;
412
413         class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
414         if (class_name)
415                 error = sysfs_create_link(&class_dev->dev->kobj,
416                                           &class_dev->kobj, class_name);
417         else
418                 error = -ENOMEM;
419         kfree(class_name);
420         return error;
421 }
422
423 static void remove_deprecated_class_device_links(struct class_device *class_dev)
424 {
425         char *class_name;
426
427         if (!class_dev->dev)
428                 return;
429
430         class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
431         if (class_name)
432                 sysfs_remove_link(&class_dev->dev->kobj, class_name);
433         kfree(class_name);
434 }
435 #else
436 static inline int deprecated_class_uevent(char **envp, int num_envp,
437                                           int *cur_index, char *buffer,
438                                           int buffer_size, int *cur_len,
439                                           struct class_device *class_dev)
440 { return 0; }
441 static inline int make_deprecated_class_device_links(struct class_device *cd)
442 { return 0; }
443 static void remove_deprecated_class_device_links(struct class_device *cd)
444 { }
445 #endif
446
447 static int class_uevent(struct kset *kset, struct kobject *kobj, char **envp,
448                          int num_envp, char *buffer, int buffer_size)
449 {
450         struct class_device *class_dev = to_class_dev(kobj);
451         int i = 0;
452         int length = 0;
453         int retval = 0;
454
455         pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id);
456
457         deprecated_class_uevent(envp, num_envp, &i, buffer, buffer_size,
458                                 &length, class_dev);
459
460         if (MAJOR(class_dev->devt)) {
461                 add_uevent_var(envp, num_envp, &i,
462                                buffer, buffer_size, &length,
463                                "MAJOR=%u", MAJOR(class_dev->devt));
464
465                 add_uevent_var(envp, num_envp, &i,
466                                buffer, buffer_size, &length,
467                                "MINOR=%u", MINOR(class_dev->devt));
468         }
469
470         /* terminate, set to next free slot, shrink available space */
471         envp[i] = NULL;
472         envp = &envp[i];
473         num_envp -= i;
474         buffer = &buffer[length];
475         buffer_size -= length;
476
477         if (class_dev->uevent) {
478                 /* have the class device specific function add its stuff */
479                 retval = class_dev->uevent(class_dev, envp, num_envp,
480                                             buffer, buffer_size);
481                 if (retval)
482                         pr_debug("class_dev->uevent() returned %d\n", retval);
483         } else if (class_dev->class->uevent) {
484                 /* have the class specific function add its stuff */
485                 retval = class_dev->class->uevent(class_dev, envp, num_envp,
486                                                    buffer, buffer_size);
487                 if (retval)
488                         pr_debug("class->uevent() returned %d\n", retval);
489         }
490
491         return retval;
492 }
493
494 static struct kset_uevent_ops class_uevent_ops = {
495         .filter =       class_uevent_filter,
496         .name =         class_uevent_name,
497         .uevent =       class_uevent,
498 };
499
500 static decl_subsys(class_obj, &ktype_class_device, &class_uevent_ops);
501
502
503 static int class_device_add_attrs(struct class_device * cd)
504 {
505         int i;
506         int error = 0;
507         struct class * cls = cd->class;
508
509         if (cls->class_dev_attrs) {
510                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) {
511                         error = class_device_create_file(cd,
512                                                          &cls->class_dev_attrs[i]);
513                         if (error)
514                                 goto Err;
515                 }
516         }
517  Done:
518         return error;
519  Err:
520         while (--i >= 0)
521                 class_device_remove_file(cd,&cls->class_dev_attrs[i]);
522         goto Done;
523 }
524
525 static void class_device_remove_attrs(struct class_device * cd)
526 {
527         int i;
528         struct class * cls = cd->class;
529
530         if (cls->class_dev_attrs) {
531                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++)
532                         class_device_remove_file(cd,&cls->class_dev_attrs[i]);
533         }
534 }
535
536 static int class_device_add_groups(struct class_device * cd)
537 {
538         int i;
539         int error = 0;
540
541         if (cd->groups) {
542                 for (i = 0; cd->groups[i]; i++) {
543                         error = sysfs_create_group(&cd->kobj, cd->groups[i]);
544                         if (error) {
545                                 while (--i >= 0)
546                                         sysfs_remove_group(&cd->kobj, cd->groups[i]);
547                                 goto out;
548                         }
549                 }
550         }
551 out:
552         return error;
553 }
554
555 static void class_device_remove_groups(struct class_device * cd)
556 {
557         int i;
558         if (cd->groups) {
559                 for (i = 0; cd->groups[i]; i++) {
560                         sysfs_remove_group(&cd->kobj, cd->groups[i]);
561                 }
562         }
563 }
564
565 static ssize_t show_dev(struct class_device *class_dev, char *buf)
566 {
567         return print_dev_t(buf, class_dev->devt);
568 }
569
570 static ssize_t store_uevent(struct class_device *class_dev,
571                             const char *buf, size_t count)
572 {
573         kobject_uevent(&class_dev->kobj, KOBJ_ADD);
574         return count;
575 }
576
577 void class_device_initialize(struct class_device *class_dev)
578 {
579         kobj_set_kset_s(class_dev, class_obj_subsys);
580         kobject_init(&class_dev->kobj);
581         INIT_LIST_HEAD(&class_dev->node);
582 }
583
584 int class_device_add(struct class_device *class_dev)
585 {
586         struct class *parent_class = NULL;
587         struct class_device *parent_class_dev = NULL;
588         struct class_interface *class_intf;
589         int error = -EINVAL;
590
591         class_dev = class_device_get(class_dev);
592         if (!class_dev)
593                 return -EINVAL;
594
595         if (!strlen(class_dev->class_id))
596                 goto out1;
597
598         parent_class = class_get(class_dev->class);
599         if (!parent_class)
600                 goto out1;
601
602         parent_class_dev = class_device_get(class_dev->parent);
603
604         pr_debug("CLASS: registering class device: ID = '%s'\n",
605                  class_dev->class_id);
606
607         /* first, register with generic layer. */
608         error = kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
609         if (error)
610                 goto out2;
611
612         if (parent_class_dev)
613                 class_dev->kobj.parent = &parent_class_dev->kobj;
614         else
615                 class_dev->kobj.parent = &parent_class->subsys.kset.kobj;
616
617         error = kobject_add(&class_dev->kobj);
618         if (error)
619                 goto out2;
620
621         /* add the needed attributes to this device */
622         error = sysfs_create_link(&class_dev->kobj,
623                                   &parent_class->subsys.kset.kobj, "subsystem");
624         if (error)
625                 goto out3;
626         class_dev->uevent_attr.attr.name = "uevent";
627         class_dev->uevent_attr.attr.mode = S_IWUSR;
628         class_dev->uevent_attr.attr.owner = parent_class->owner;
629         class_dev->uevent_attr.store = store_uevent;
630         error = class_device_create_file(class_dev, &class_dev->uevent_attr);
631         if (error)
632                 goto out3;
633
634         if (MAJOR(class_dev->devt)) {
635                 struct class_device_attribute *attr;
636                 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
637                 if (!attr) {
638                         error = -ENOMEM;
639                         goto out4;
640                 }
641                 attr->attr.name = "dev";
642                 attr->attr.mode = S_IRUGO;
643                 attr->attr.owner = parent_class->owner;
644                 attr->show = show_dev;
645                 error = class_device_create_file(class_dev, attr);
646                 if (error) {
647                         kfree(attr);
648                         goto out4;
649                 }
650
651                 class_dev->devt_attr = attr;
652         }
653
654         error = class_device_add_attrs(class_dev);
655         if (error)
656                 goto out5;
657
658         if (class_dev->dev) {
659                 error = sysfs_create_link(&class_dev->kobj,
660                                           &class_dev->dev->kobj, "device");
661                 if (error)
662                         goto out6;
663         }
664
665         error = class_device_add_groups(class_dev);
666         if (error)
667                 goto out7;
668
669         error = make_deprecated_class_device_links(class_dev);
670         if (error)
671                 goto out8;
672
673         kobject_uevent(&class_dev->kobj, KOBJ_ADD);
674
675         /* notify any interfaces this device is now here */
676         down(&parent_class->sem);
677         list_add_tail(&class_dev->node, &parent_class->children);
678         list_for_each_entry(class_intf, &parent_class->interfaces, node) {
679                 if (class_intf->add)
680                         class_intf->add(class_dev, class_intf);
681         }
682         up(&parent_class->sem);
683
684         goto out1;
685
686  out8:
687         class_device_remove_groups(class_dev);
688  out7:
689         if (class_dev->dev)
690                 sysfs_remove_link(&class_dev->kobj, "device");
691  out6:
692         class_device_remove_attrs(class_dev);
693  out5:
694         if (class_dev->devt_attr)
695                 class_device_remove_file(class_dev, class_dev->devt_attr);
696  out4:
697         class_device_remove_file(class_dev, &class_dev->uevent_attr);
698  out3:
699         kobject_del(&class_dev->kobj);
700  out2:
701         if(parent_class_dev)
702                 class_device_put(parent_class_dev);
703         class_put(parent_class);
704  out1:
705         class_device_put(class_dev);
706         return error;
707 }
708
709 int class_device_register(struct class_device *class_dev)
710 {
711         class_device_initialize(class_dev);
712         return class_device_add(class_dev);
713 }
714
715 /**
716  * class_device_create - creates a class device and registers it with sysfs
717  * @cls: pointer to the struct class that this device should be registered to.
718  * @parent: pointer to the parent struct class_device of this new device, if any.
719  * @devt: the dev_t for the char device to be added.
720  * @device: a pointer to a struct device that is assiociated with this class device.
721  * @fmt: string for the class device's name
722  *
723  * This function can be used by char device classes.  A struct
724  * class_device will be created in sysfs, registered to the specified
725  * class.
726  * A "dev" file will be created, showing the dev_t for the device, if
727  * the dev_t is not 0,0.
728  * If a pointer to a parent struct class_device is passed in, the newly
729  * created struct class_device will be a child of that device in sysfs.
730  * The pointer to the struct class_device will be returned from the
731  * call.  Any further sysfs files that might be required can be created
732  * using this pointer.
733  *
734  * Note: the struct class passed to this function must have previously
735  * been created with a call to class_create().
736  */
737 struct class_device *class_device_create(struct class *cls,
738                                          struct class_device *parent,
739                                          dev_t devt,
740                                          struct device *device,
741                                          const char *fmt, ...)
742 {
743         va_list args;
744         struct class_device *class_dev = NULL;
745         int retval = -ENODEV;
746
747         if (cls == NULL || IS_ERR(cls))
748                 goto error;
749
750         class_dev = kzalloc(sizeof(*class_dev), GFP_KERNEL);
751         if (!class_dev) {
752                 retval = -ENOMEM;
753                 goto error;
754         }
755
756         class_dev->devt = devt;
757         class_dev->dev = device;
758         class_dev->class = cls;
759         class_dev->parent = parent;
760         class_dev->release = class_device_create_release;
761         class_dev->uevent = class_device_create_uevent;
762
763         va_start(args, fmt);
764         vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args);
765         va_end(args);
766         retval = class_device_register(class_dev);
767         if (retval)
768                 goto error;
769
770         return class_dev;
771
772 error:
773         kfree(class_dev);
774         return ERR_PTR(retval);
775 }
776
777 void class_device_del(struct class_device *class_dev)
778 {
779         struct class *parent_class = class_dev->class;
780         struct class_device *parent_device = class_dev->parent;
781         struct class_interface *class_intf;
782
783         if (parent_class) {
784                 down(&parent_class->sem);
785                 list_del_init(&class_dev->node);
786                 list_for_each_entry(class_intf, &parent_class->interfaces, node)
787                         if (class_intf->remove)
788                                 class_intf->remove(class_dev, class_intf);
789                 up(&parent_class->sem);
790         }
791
792         if (class_dev->dev) {
793                 remove_deprecated_class_device_links(class_dev);
794                 sysfs_remove_link(&class_dev->kobj, "device");
795         }
796         sysfs_remove_link(&class_dev->kobj, "subsystem");
797         class_device_remove_file(class_dev, &class_dev->uevent_attr);
798         if (class_dev->devt_attr)
799                 class_device_remove_file(class_dev, class_dev->devt_attr);
800         class_device_remove_attrs(class_dev);
801         class_device_remove_groups(class_dev);
802
803         kobject_uevent(&class_dev->kobj, KOBJ_REMOVE);
804         kobject_del(&class_dev->kobj);
805
806         class_device_put(parent_device);
807         class_put(parent_class);
808 }
809
810 void class_device_unregister(struct class_device *class_dev)
811 {
812         pr_debug("CLASS: Unregistering class device. ID = '%s'\n",
813                  class_dev->class_id);
814         class_device_del(class_dev);
815         class_device_put(class_dev);
816 }
817
818 /**
819  * class_device_destroy - removes a class device that was created with class_device_create()
820  * @cls: the pointer to the struct class that this device was registered * with.
821  * @devt: the dev_t of the device that was previously registered.
822  *
823  * This call unregisters and cleans up a class device that was created with a
824  * call to class_device_create()
825  */
826 void class_device_destroy(struct class *cls, dev_t devt)
827 {
828         struct class_device *class_dev = NULL;
829         struct class_device *class_dev_tmp;
830
831         down(&cls->sem);
832         list_for_each_entry(class_dev_tmp, &cls->children, node) {
833                 if (class_dev_tmp->devt == devt) {
834                         class_dev = class_dev_tmp;
835                         break;
836                 }
837         }
838         up(&cls->sem);
839
840         if (class_dev)
841                 class_device_unregister(class_dev);
842 }
843
844 int class_device_rename(struct class_device *class_dev, char *new_name)
845 {
846         int error = 0;
847         char *old_class_name = NULL, *new_class_name = NULL;
848
849         class_dev = class_device_get(class_dev);
850         if (!class_dev)
851                 return -EINVAL;
852
853         pr_debug("CLASS: renaming '%s' to '%s'\n", class_dev->class_id,
854                  new_name);
855
856 #ifdef CONFIG_SYSFS_DEPRECATED
857         if (class_dev->dev)
858                 old_class_name = make_class_name(class_dev->class->name,
859                                                  &class_dev->kobj);
860 #endif
861
862         strlcpy(class_dev->class_id, new_name, KOBJ_NAME_LEN);
863
864         error = kobject_rename(&class_dev->kobj, new_name);
865
866 #ifdef CONFIG_SYSFS_DEPRECATED
867         if (class_dev->dev) {
868                 new_class_name = make_class_name(class_dev->class->name,
869                                                  &class_dev->kobj);
870                 if (new_class_name)
871                         sysfs_create_link(&class_dev->dev->kobj,
872                                           &class_dev->kobj, new_class_name);
873                 if (old_class_name)
874                         sysfs_remove_link(&class_dev->dev->kobj,
875                                                 old_class_name);
876         }
877 #endif
878         class_device_put(class_dev);
879
880         kfree(old_class_name);
881         kfree(new_class_name);
882
883         return error;
884 }
885
886 struct class_device * class_device_get(struct class_device *class_dev)
887 {
888         if (class_dev)
889                 return to_class_dev(kobject_get(&class_dev->kobj));
890         return NULL;
891 }
892
893 void class_device_put(struct class_device *class_dev)
894 {
895         if (class_dev)
896                 kobject_put(&class_dev->kobj);
897 }
898
899
900 int class_interface_register(struct class_interface *class_intf)
901 {
902         struct class *parent;
903         struct class_device *class_dev;
904         struct device *dev;
905
906         if (!class_intf || !class_intf->class)
907                 return -ENODEV;
908
909         parent = class_get(class_intf->class);
910         if (!parent)
911                 return -EINVAL;
912
913         down(&parent->sem);
914         list_add_tail(&class_intf->node, &parent->interfaces);
915         if (class_intf->add) {
916                 list_for_each_entry(class_dev, &parent->children, node)
917                         class_intf->add(class_dev, class_intf);
918         }
919         if (class_intf->add_dev) {
920                 list_for_each_entry(dev, &parent->devices, node)
921                         class_intf->add_dev(dev, class_intf);
922         }
923         up(&parent->sem);
924
925         return 0;
926 }
927
928 void class_interface_unregister(struct class_interface *class_intf)
929 {
930         struct class * parent = class_intf->class;
931         struct class_device *class_dev;
932         struct device *dev;
933
934         if (!parent)
935                 return;
936
937         down(&parent->sem);
938         list_del_init(&class_intf->node);
939         if (class_intf->remove) {
940                 list_for_each_entry(class_dev, &parent->children, node)
941                         class_intf->remove(class_dev, class_intf);
942         }
943         if (class_intf->remove_dev) {
944                 list_for_each_entry(dev, &parent->devices, node)
945                         class_intf->remove_dev(dev, class_intf);
946         }
947         up(&parent->sem);
948
949         class_put(parent);
950 }
951
952 int __init classes_init(void)
953 {
954         int retval;
955
956         retval = subsystem_register(&class_subsys);
957         if (retval)
958                 return retval;
959
960         /* ick, this is ugly, the things we go through to keep from showing up
961          * in sysfs... */
962         subsystem_init(&class_obj_subsys);
963         if (!class_obj_subsys.kset.subsys)
964                         class_obj_subsys.kset.subsys = &class_obj_subsys;
965         return 0;
966 }
967
968 EXPORT_SYMBOL_GPL(class_create_file);
969 EXPORT_SYMBOL_GPL(class_remove_file);
970 EXPORT_SYMBOL_GPL(class_register);
971 EXPORT_SYMBOL_GPL(class_unregister);
972 EXPORT_SYMBOL_GPL(class_create);
973 EXPORT_SYMBOL_GPL(class_destroy);
974
975 EXPORT_SYMBOL_GPL(class_device_register);
976 EXPORT_SYMBOL_GPL(class_device_unregister);
977 EXPORT_SYMBOL_GPL(class_device_initialize);
978 EXPORT_SYMBOL_GPL(class_device_add);
979 EXPORT_SYMBOL_GPL(class_device_del);
980 EXPORT_SYMBOL_GPL(class_device_get);
981 EXPORT_SYMBOL_GPL(class_device_put);
982 EXPORT_SYMBOL_GPL(class_device_create);
983 EXPORT_SYMBOL_GPL(class_device_destroy);
984 EXPORT_SYMBOL_GPL(class_device_create_file);
985 EXPORT_SYMBOL_GPL(class_device_remove_file);
986 EXPORT_SYMBOL_GPL(class_device_create_bin_file);
987 EXPORT_SYMBOL_GPL(class_device_remove_bin_file);
988
989 EXPORT_SYMBOL_GPL(class_interface_register);
990 EXPORT_SYMBOL_GPL(class_interface_unregister);