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15#include <linux/kobject.h>
16#include <linux/string.h>
17#include <linux/module.h>
18#include <linux/stat.h>
19#include <linux/slab.h>
20
21
22
23
24
25
26
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28
29
30static int populate_dir(struct kobject *kobj)
31{
32 struct kobj_type *t = get_ktype(kobj);
33 struct attribute *attr;
34 int error = 0;
35 int i;
36
37 if (t && t->default_attrs) {
38 for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) {
39 error = sysfs_create_file(kobj, attr);
40 if (error)
41 break;
42 }
43 }
44 return error;
45}
46
47static int create_dir(struct kobject *kobj)
48{
49 int error = 0;
50 if (kobject_name(kobj)) {
51 error = sysfs_create_dir(kobj);
52 if (!error) {
53 error = populate_dir(kobj);
54 if (error)
55 sysfs_remove_dir(kobj);
56 }
57 }
58 return error;
59}
60
61static int get_kobj_path_length(struct kobject *kobj)
62{
63 int length = 1;
64 struct kobject *parent = kobj;
65
66
67
68
69
70 do {
71 if (kobject_name(parent) == NULL)
72 return 0;
73 length += strlen(kobject_name(parent)) + 1;
74 parent = parent->parent;
75 } while (parent);
76 return length;
77}
78
79static void fill_kobj_path(struct kobject *kobj, char *path, int length)
80{
81 struct kobject *parent;
82
83 --length;
84 for (parent = kobj; parent; parent = parent->parent) {
85 int cur = strlen(kobject_name(parent));
86
87 length -= cur;
88 strncpy(path + length, kobject_name(parent), cur);
89 *(path + --length) = '/';
90 }
91
92 pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj),
93 kobj, __func__, path);
94}
95
96
97
98
99
100
101
102
103
104char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
105{
106 char *path;
107 int len;
108
109 len = get_kobj_path_length(kobj);
110 if (len == 0)
111 return NULL;
112 path = kzalloc(len, gfp_mask);
113 if (!path)
114 return NULL;
115 fill_kobj_path(kobj, path, len);
116
117 return path;
118}
119EXPORT_SYMBOL_GPL(kobject_get_path);
120
121
122static void kobj_kset_join(struct kobject *kobj)
123{
124 if (!kobj->kset)
125 return;
126
127 kset_get(kobj->kset);
128 spin_lock(&kobj->kset->list_lock);
129 list_add_tail(&kobj->entry, &kobj->kset->list);
130 spin_unlock(&kobj->kset->list_lock);
131}
132
133
134static void kobj_kset_leave(struct kobject *kobj)
135{
136 if (!kobj->kset)
137 return;
138
139 spin_lock(&kobj->kset->list_lock);
140 list_del_init(&kobj->entry);
141 spin_unlock(&kobj->kset->list_lock);
142 kset_put(kobj->kset);
143}
144
145static void kobject_init_internal(struct kobject *kobj)
146{
147 if (!kobj)
148 return;
149 kref_init(&kobj->kref);
150 INIT_LIST_HEAD(&kobj->entry);
151 kobj->state_in_sysfs = 0;
152 kobj->state_add_uevent_sent = 0;
153 kobj->state_remove_uevent_sent = 0;
154 kobj->state_initialized = 1;
155}
156
157
158static int kobject_add_internal(struct kobject *kobj)
159{
160 int error = 0;
161 struct kobject *parent;
162
163 if (!kobj)
164 return -ENOENT;
165
166 if (!kobj->name || !kobj->name[0]) {
167 WARN(1, "kobject: (%p): attempted to be registered with empty "
168 "name!\n", kobj);
169 return -EINVAL;
170 }
171
172 parent = kobject_get(kobj->parent);
173
174
175 if (kobj->kset) {
176 if (!parent)
177 parent = kobject_get(&kobj->kset->kobj);
178 kobj_kset_join(kobj);
179 kobj->parent = parent;
180 }
181
182 pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
183 kobject_name(kobj), kobj, __func__,
184 parent ? kobject_name(parent) : "<NULL>",
185 kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>");
186
187 error = create_dir(kobj);
188 if (error) {
189 kobj_kset_leave(kobj);
190 kobject_put(parent);
191 kobj->parent = NULL;
192
193
194 if (error == -EEXIST)
195 printk(KERN_ERR "%s failed for %s with "
196 "-EEXIST, don't try to register things with "
197 "the same name in the same directory.\n",
198 __func__, kobject_name(kobj));
199 else
200 printk(KERN_ERR "%s failed for %s (%d)\n",
201 __func__, kobject_name(kobj), error);
202 dump_stack();
203 } else
204 kobj->state_in_sysfs = 1;
205
206 return error;
207}
208
209
210
211
212
213
214
215int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
216 va_list vargs)
217{
218 const char *old_name = kobj->name;
219 char *s;
220
221 if (kobj->name && !fmt)
222 return 0;
223
224 kobj->name = kvasprintf(GFP_KERNEL, fmt, vargs);
225 if (!kobj->name)
226 return -ENOMEM;
227
228
229 while ((s = strchr(kobj->name, '/')))
230 s[0] = '!';
231
232 kfree(old_name);
233 return 0;
234}
235
236
237
238
239
240
241
242
243
244
245int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
246{
247 va_list vargs;
248 int retval;
249
250 va_start(vargs, fmt);
251 retval = kobject_set_name_vargs(kobj, fmt, vargs);
252 va_end(vargs);
253
254 return retval;
255}
256EXPORT_SYMBOL(kobject_set_name);
257
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264
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267
268
269
270void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
271{
272 char *err_str;
273
274 if (!kobj) {
275 err_str = "invalid kobject pointer!";
276 goto error;
277 }
278 if (!ktype) {
279 err_str = "must have a ktype to be initialized properly!\n";
280 goto error;
281 }
282 if (kobj->state_initialized) {
283
284 printk(KERN_ERR "kobject (%p): tried to init an initialized "
285 "object, something is seriously wrong.\n", kobj);
286 dump_stack();
287 }
288
289 kobject_init_internal(kobj);
290 kobj->ktype = ktype;
291 return;
292
293error:
294 printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str);
295 dump_stack();
296}
297EXPORT_SYMBOL(kobject_init);
298
299static int kobject_add_varg(struct kobject *kobj, struct kobject *parent,
300 const char *fmt, va_list vargs)
301{
302 int retval;
303
304 retval = kobject_set_name_vargs(kobj, fmt, vargs);
305 if (retval) {
306 printk(KERN_ERR "kobject: can not set name properly!\n");
307 return retval;
308 }
309 kobj->parent = parent;
310 return kobject_add_internal(kobj);
311}
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338int kobject_add(struct kobject *kobj, struct kobject *parent,
339 const char *fmt, ...)
340{
341 va_list args;
342 int retval;
343
344 if (!kobj)
345 return -EINVAL;
346
347 if (!kobj->state_initialized) {
348 printk(KERN_ERR "kobject '%s' (%p): tried to add an "
349 "uninitialized object, something is seriously wrong.\n",
350 kobject_name(kobj), kobj);
351 dump_stack();
352 return -EINVAL;
353 }
354 va_start(args, fmt);
355 retval = kobject_add_varg(kobj, parent, fmt, args);
356 va_end(args);
357
358 return retval;
359}
360EXPORT_SYMBOL(kobject_add);
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371
372
373int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
374 struct kobject *parent, const char *fmt, ...)
375{
376 va_list args;
377 int retval;
378
379 kobject_init(kobj, ktype);
380
381 va_start(args, fmt);
382 retval = kobject_add_varg(kobj, parent, fmt, args);
383 va_end(args);
384
385 return retval;
386}
387EXPORT_SYMBOL_GPL(kobject_init_and_add);
388
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396
397
398
399int kobject_rename(struct kobject *kobj, const char *new_name)
400{
401 int error = 0;
402 const char *devpath = NULL;
403 const char *dup_name = NULL, *name;
404 char *devpath_string = NULL;
405 char *envp[2];
406
407 kobj = kobject_get(kobj);
408 if (!kobj)
409 return -EINVAL;
410 if (!kobj->parent)
411 return -EINVAL;
412
413 devpath = kobject_get_path(kobj, GFP_KERNEL);
414 if (!devpath) {
415 error = -ENOMEM;
416 goto out;
417 }
418 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
419 if (!devpath_string) {
420 error = -ENOMEM;
421 goto out;
422 }
423 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
424 envp[0] = devpath_string;
425 envp[1] = NULL;
426
427 name = dup_name = kstrdup(new_name, GFP_KERNEL);
428 if (!name) {
429 error = -ENOMEM;
430 goto out;
431 }
432
433 error = sysfs_rename_dir(kobj, new_name);
434 if (error)
435 goto out;
436
437
438 dup_name = kobj->name;
439 kobj->name = name;
440
441
442
443
444 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
445
446out:
447 kfree(dup_name);
448 kfree(devpath_string);
449 kfree(devpath);
450 kobject_put(kobj);
451
452 return error;
453}
454EXPORT_SYMBOL_GPL(kobject_rename);
455
456
457
458
459
460
461int kobject_move(struct kobject *kobj, struct kobject *new_parent)
462{
463 int error;
464 struct kobject *old_parent;
465 const char *devpath = NULL;
466 char *devpath_string = NULL;
467 char *envp[2];
468
469 kobj = kobject_get(kobj);
470 if (!kobj)
471 return -EINVAL;
472 new_parent = kobject_get(new_parent);
473 if (!new_parent) {
474 if (kobj->kset)
475 new_parent = kobject_get(&kobj->kset->kobj);
476 }
477
478 devpath = kobject_get_path(kobj, GFP_KERNEL);
479 if (!devpath) {
480 error = -ENOMEM;
481 goto out;
482 }
483 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
484 if (!devpath_string) {
485 error = -ENOMEM;
486 goto out;
487 }
488 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
489 envp[0] = devpath_string;
490 envp[1] = NULL;
491 error = sysfs_move_dir(kobj, new_parent);
492 if (error)
493 goto out;
494 old_parent = kobj->parent;
495 kobj->parent = new_parent;
496 new_parent = NULL;
497 kobject_put(old_parent);
498 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
499out:
500 kobject_put(new_parent);
501 kobject_put(kobj);
502 kfree(devpath_string);
503 kfree(devpath);
504 return error;
505}
506
507
508
509
510
511void kobject_del(struct kobject *kobj)
512{
513 if (!kobj)
514 return;
515
516 sysfs_remove_dir(kobj);
517 kobj->state_in_sysfs = 0;
518 kobj_kset_leave(kobj);
519 kobject_put(kobj->parent);
520 kobj->parent = NULL;
521}
522
523
524
525
526
527struct kobject *kobject_get(struct kobject *kobj)
528{
529 if (kobj)
530 kref_get(&kobj->kref);
531 return kobj;
532}
533
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535
536
537
538static void kobject_cleanup(struct kobject *kobj)
539{
540 struct kobj_type *t = get_ktype(kobj);
541 const char *name = kobj->name;
542
543 pr_debug("kobject: '%s' (%p): %s\n",
544 kobject_name(kobj), kobj, __func__);
545
546 if (t && !t->release)
547 pr_debug("kobject: '%s' (%p): does not have a release() "
548 "function, it is broken and must be fixed.\n",
549 kobject_name(kobj), kobj);
550
551
552 if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
553 pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
554 kobject_name(kobj), kobj);
555 kobject_uevent(kobj, KOBJ_REMOVE);
556 }
557
558
559 if (kobj->state_in_sysfs) {
560 pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
561 kobject_name(kobj), kobj);
562 kobject_del(kobj);
563 }
564
565 if (t && t->release) {
566 pr_debug("kobject: '%s' (%p): calling ktype release\n",
567 kobject_name(kobj), kobj);
568 t->release(kobj);
569 }
570
571
572 if (name) {
573 pr_debug("kobject: '%s': free name\n", name);
574 kfree(name);
575 }
576}
577
578static void kobject_release(struct kref *kref)
579{
580 kobject_cleanup(container_of(kref, struct kobject, kref));
581}
582
583
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585
586
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588
589void kobject_put(struct kobject *kobj)
590{
591 if (kobj) {
592 if (!kobj->state_initialized)
593 WARN(1, KERN_WARNING "kobject: '%s' (%p): is not "
594 "initialized, yet kobject_put() is being "
595 "called.\n", kobject_name(kobj), kobj);
596 kref_put(&kobj->kref, kobject_release);
597 }
598}
599
600static void dynamic_kobj_release(struct kobject *kobj)
601{
602 pr_debug("kobject: (%p): %s\n", kobj, __func__);
603 kfree(kobj);
604}
605
606static struct kobj_type dynamic_kobj_ktype = {
607 .release = dynamic_kobj_release,
608 .sysfs_ops = &kobj_sysfs_ops,
609};
610
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619
620
621
622struct kobject *kobject_create(void)
623{
624 struct kobject *kobj;
625
626 kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
627 if (!kobj)
628 return NULL;
629
630 kobject_init(kobj, &dynamic_kobj_ktype);
631 return kobj;
632}
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645
646
647struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
648{
649 struct kobject *kobj;
650 int retval;
651
652 kobj = kobject_create();
653 if (!kobj)
654 return NULL;
655
656 retval = kobject_add(kobj, parent, "%s", name);
657 if (retval) {
658 printk(KERN_WARNING "%s: kobject_add error: %d\n",
659 __func__, retval);
660 kobject_put(kobj);
661 kobj = NULL;
662 }
663 return kobj;
664}
665EXPORT_SYMBOL_GPL(kobject_create_and_add);
666
667
668
669
670
671void kset_init(struct kset *k)
672{
673 kobject_init_internal(&k->kobj);
674 INIT_LIST_HEAD(&k->list);
675 spin_lock_init(&k->list_lock);
676}
677
678
679static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
680 char *buf)
681{
682 struct kobj_attribute *kattr;
683 ssize_t ret = -EIO;
684
685 kattr = container_of(attr, struct kobj_attribute, attr);
686 if (kattr->show)
687 ret = kattr->show(kobj, kattr, buf);
688 return ret;
689}
690
691static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
692 const char *buf, size_t count)
693{
694 struct kobj_attribute *kattr;
695 ssize_t ret = -EIO;
696
697 kattr = container_of(attr, struct kobj_attribute, attr);
698 if (kattr->store)
699 ret = kattr->store(kobj, kattr, buf, count);
700 return ret;
701}
702
703struct sysfs_ops kobj_sysfs_ops = {
704 .show = kobj_attr_show,
705 .store = kobj_attr_store,
706};
707
708
709
710
711
712int kset_register(struct kset *k)
713{
714 int err;
715
716 if (!k)
717 return -EINVAL;
718
719 kset_init(k);
720 err = kobject_add_internal(&k->kobj);
721 if (err)
722 return err;
723 kobject_uevent(&k->kobj, KOBJ_ADD);
724 return 0;
725}
726
727
728
729
730
731void kset_unregister(struct kset *k)
732{
733 if (!k)
734 return;
735 kobject_put(&k->kobj);
736}
737
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741
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743
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745
746
747struct kobject *kset_find_obj(struct kset *kset, const char *name)
748{
749 struct kobject *k;
750 struct kobject *ret = NULL;
751
752 spin_lock(&kset->list_lock);
753 list_for_each_entry(k, &kset->list, entry) {
754 if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
755 ret = kobject_get(k);
756 break;
757 }
758 }
759 spin_unlock(&kset->list_lock);
760 return ret;
761}
762
763static void kset_release(struct kobject *kobj)
764{
765 struct kset *kset = container_of(kobj, struct kset, kobj);
766 pr_debug("kobject: '%s' (%p): %s\n",
767 kobject_name(kobj), kobj, __func__);
768 kfree(kset);
769}
770
771static struct kobj_type kset_ktype = {
772 .sysfs_ops = &kobj_sysfs_ops,
773 .release = kset_release,
774};
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791static struct kset *kset_create(const char *name,
792 struct kset_uevent_ops *uevent_ops,
793 struct kobject *parent_kobj)
794{
795 struct kset *kset;
796
797 kset = kzalloc(sizeof(*kset), GFP_KERNEL);
798 if (!kset)
799 return NULL;
800 kobject_set_name(&kset->kobj, name);
801 kset->uevent_ops = uevent_ops;
802 kset->kobj.parent = parent_kobj;
803
804
805
806
807
808
809 kset->kobj.ktype = &kset_ktype;
810 kset->kobj.kset = NULL;
811
812 return kset;
813}
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828
829struct kset *kset_create_and_add(const char *name,
830 struct kset_uevent_ops *uevent_ops,
831 struct kobject *parent_kobj)
832{
833 struct kset *kset;
834 int error;
835
836 kset = kset_create(name, uevent_ops, parent_kobj);
837 if (!kset)
838 return NULL;
839 error = kset_register(kset);
840 if (error) {
841 kfree(kset);
842 return NULL;
843 }
844 return kset;
845}
846EXPORT_SYMBOL_GPL(kset_create_and_add);
847
848EXPORT_SYMBOL(kobject_get);
849EXPORT_SYMBOL(kobject_put);
850EXPORT_SYMBOL(kobject_del);
851
852EXPORT_SYMBOL(kset_register);
853EXPORT_SYMBOL(kset_unregister);
854