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9#include <linux/device.h>
10#include <linux/kernel.h>
11#include <linux/property.h>
12#include <linux/slab.h>
13
14struct swnode {
15 struct kobject kobj;
16 struct fwnode_handle fwnode;
17 const struct software_node *node;
18 int id;
19
20
21 struct ida child_ids;
22 struct list_head entry;
23 struct list_head children;
24 struct swnode *parent;
25
26 unsigned int allocated:1;
27 unsigned int managed:1;
28};
29
30static DEFINE_IDA(swnode_root_ids);
31static struct kset *swnode_kset;
32
33#define kobj_to_swnode(_kobj_) container_of(_kobj_, struct swnode, kobj)
34
35static const struct fwnode_operations software_node_ops;
36
37bool is_software_node(const struct fwnode_handle *fwnode)
38{
39 return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &software_node_ops;
40}
41EXPORT_SYMBOL_GPL(is_software_node);
42
43#define to_swnode(__fwnode) \
44 ({ \
45 typeof(__fwnode) __to_swnode_fwnode = __fwnode; \
46 \
47 is_software_node(__to_swnode_fwnode) ? \
48 container_of(__to_swnode_fwnode, \
49 struct swnode, fwnode) : NULL; \
50 })
51
52static inline struct swnode *dev_to_swnode(struct device *dev)
53{
54 struct fwnode_handle *fwnode = dev_fwnode(dev);
55
56 if (!fwnode)
57 return NULL;
58
59 if (!is_software_node(fwnode))
60 fwnode = fwnode->secondary;
61
62 return to_swnode(fwnode);
63}
64
65static struct swnode *
66software_node_to_swnode(const struct software_node *node)
67{
68 struct swnode *swnode = NULL;
69 struct kobject *k;
70
71 if (!node)
72 return NULL;
73
74 spin_lock(&swnode_kset->list_lock);
75
76 list_for_each_entry(k, &swnode_kset->list, entry) {
77 swnode = kobj_to_swnode(k);
78 if (swnode->node == node)
79 break;
80 swnode = NULL;
81 }
82
83 spin_unlock(&swnode_kset->list_lock);
84
85 return swnode;
86}
87
88const struct software_node *to_software_node(const struct fwnode_handle *fwnode)
89{
90 const struct swnode *swnode = to_swnode(fwnode);
91
92 return swnode ? swnode->node : NULL;
93}
94EXPORT_SYMBOL_GPL(to_software_node);
95
96struct fwnode_handle *software_node_fwnode(const struct software_node *node)
97{
98 struct swnode *swnode = software_node_to_swnode(node);
99
100 return swnode ? &swnode->fwnode : NULL;
101}
102EXPORT_SYMBOL_GPL(software_node_fwnode);
103
104
105
106
107static const struct property_entry *
108property_entry_get(const struct property_entry *prop, const char *name)
109{
110 if (!prop)
111 return NULL;
112
113 for (; prop->name; prop++)
114 if (!strcmp(name, prop->name))
115 return prop;
116
117 return NULL;
118}
119
120static const void *property_get_pointer(const struct property_entry *prop)
121{
122 if (!prop->length)
123 return NULL;
124
125 return prop->is_inline ? &prop->value : prop->pointer;
126}
127
128static const void *property_entry_find(const struct property_entry *props,
129 const char *propname, size_t length)
130{
131 const struct property_entry *prop;
132 const void *pointer;
133
134 prop = property_entry_get(props, propname);
135 if (!prop)
136 return ERR_PTR(-EINVAL);
137 pointer = property_get_pointer(prop);
138 if (!pointer)
139 return ERR_PTR(-ENODATA);
140 if (length > prop->length)
141 return ERR_PTR(-EOVERFLOW);
142 return pointer;
143}
144
145static int
146property_entry_count_elems_of_size(const struct property_entry *props,
147 const char *propname, size_t length)
148{
149 const struct property_entry *prop;
150
151 prop = property_entry_get(props, propname);
152 if (!prop)
153 return -EINVAL;
154
155 return prop->length / length;
156}
157
158static int property_entry_read_int_array(const struct property_entry *props,
159 const char *name,
160 unsigned int elem_size, void *val,
161 size_t nval)
162{
163 const void *pointer;
164 size_t length;
165
166 if (!val)
167 return property_entry_count_elems_of_size(props, name,
168 elem_size);
169
170 if (!is_power_of_2(elem_size) || elem_size > sizeof(u64))
171 return -ENXIO;
172
173 length = nval * elem_size;
174
175 pointer = property_entry_find(props, name, length);
176 if (IS_ERR(pointer))
177 return PTR_ERR(pointer);
178
179 memcpy(val, pointer, length);
180 return 0;
181}
182
183static int property_entry_read_string_array(const struct property_entry *props,
184 const char *propname,
185 const char **strings, size_t nval)
186{
187 const void *pointer;
188 size_t length;
189 int array_len;
190
191
192 array_len = property_entry_count_elems_of_size(props, propname,
193 sizeof(const char *));
194 if (array_len < 0)
195 return array_len;
196
197
198 if (!strings)
199 return array_len;
200
201 array_len = min_t(size_t, nval, array_len);
202 length = array_len * sizeof(*strings);
203
204 pointer = property_entry_find(props, propname, length);
205 if (IS_ERR(pointer))
206 return PTR_ERR(pointer);
207
208 memcpy(strings, pointer, length);
209
210 return array_len;
211}
212
213static void property_entry_free_data(const struct property_entry *p)
214{
215 const char * const *src_str;
216 size_t i, nval;
217
218 if (p->type == DEV_PROP_STRING) {
219 src_str = property_get_pointer(p);
220 nval = p->length / sizeof(*src_str);
221 for (i = 0; i < nval; i++)
222 kfree(src_str[i]);
223 }
224
225 if (!p->is_inline)
226 kfree(p->pointer);
227
228 kfree(p->name);
229}
230
231static bool property_copy_string_array(const char **dst_ptr,
232 const char * const *src_ptr,
233 size_t nval)
234{
235 int i;
236
237 for (i = 0; i < nval; i++) {
238 dst_ptr[i] = kstrdup(src_ptr[i], GFP_KERNEL);
239 if (!dst_ptr[i] && src_ptr[i]) {
240 while (--i >= 0)
241 kfree(dst_ptr[i]);
242 return false;
243 }
244 }
245
246 return true;
247}
248
249static int property_entry_copy_data(struct property_entry *dst,
250 const struct property_entry *src)
251{
252 const void *pointer = property_get_pointer(src);
253 void *dst_ptr;
254 size_t nval;
255
256
257
258
259
260 if (!src->is_inline && !src->length)
261 return -ENODATA;
262
263
264
265
266
267 if (src->type == DEV_PROP_REF && src->is_inline)
268 return -EINVAL;
269
270 if (src->length <= sizeof(dst->value)) {
271 dst_ptr = &dst->value;
272 dst->is_inline = true;
273 } else {
274 dst_ptr = kmalloc(src->length, GFP_KERNEL);
275 if (!dst_ptr)
276 return -ENOMEM;
277 dst->pointer = dst_ptr;
278 }
279
280 if (src->type == DEV_PROP_STRING) {
281 nval = src->length / sizeof(const char *);
282 if (!property_copy_string_array(dst_ptr, pointer, nval)) {
283 if (!dst->is_inline)
284 kfree(dst->pointer);
285 return -ENOMEM;
286 }
287 } else {
288 memcpy(dst_ptr, pointer, src->length);
289 }
290
291 dst->length = src->length;
292 dst->type = src->type;
293 dst->name = kstrdup(src->name, GFP_KERNEL);
294 if (!dst->name) {
295 property_entry_free_data(dst);
296 return -ENOMEM;
297 }
298
299 return 0;
300}
301
302
303
304
305
306
307
308
309struct property_entry *
310property_entries_dup(const struct property_entry *properties)
311{
312 struct property_entry *p;
313 int i, n = 0;
314 int ret;
315
316 if (!properties)
317 return NULL;
318
319 while (properties[n].name)
320 n++;
321
322 p = kcalloc(n + 1, sizeof(*p), GFP_KERNEL);
323 if (!p)
324 return ERR_PTR(-ENOMEM);
325
326 for (i = 0; i < n; i++) {
327 ret = property_entry_copy_data(&p[i], &properties[i]);
328 if (ret) {
329 while (--i >= 0)
330 property_entry_free_data(&p[i]);
331 kfree(p);
332 return ERR_PTR(ret);
333 }
334 }
335
336 return p;
337}
338EXPORT_SYMBOL_GPL(property_entries_dup);
339
340
341
342
343
344
345
346
347void property_entries_free(const struct property_entry *properties)
348{
349 const struct property_entry *p;
350
351 if (!properties)
352 return;
353
354 for (p = properties; p->name; p++)
355 property_entry_free_data(p);
356
357 kfree(properties);
358}
359EXPORT_SYMBOL_GPL(property_entries_free);
360
361
362
363
364static struct fwnode_handle *software_node_get(struct fwnode_handle *fwnode)
365{
366 struct swnode *swnode = to_swnode(fwnode);
367
368 kobject_get(&swnode->kobj);
369
370 return &swnode->fwnode;
371}
372
373static void software_node_put(struct fwnode_handle *fwnode)
374{
375 struct swnode *swnode = to_swnode(fwnode);
376
377 kobject_put(&swnode->kobj);
378}
379
380static bool software_node_property_present(const struct fwnode_handle *fwnode,
381 const char *propname)
382{
383 struct swnode *swnode = to_swnode(fwnode);
384
385 return !!property_entry_get(swnode->node->properties, propname);
386}
387
388static int software_node_read_int_array(const struct fwnode_handle *fwnode,
389 const char *propname,
390 unsigned int elem_size, void *val,
391 size_t nval)
392{
393 struct swnode *swnode = to_swnode(fwnode);
394
395 return property_entry_read_int_array(swnode->node->properties, propname,
396 elem_size, val, nval);
397}
398
399static int software_node_read_string_array(const struct fwnode_handle *fwnode,
400 const char *propname,
401 const char **val, size_t nval)
402{
403 struct swnode *swnode = to_swnode(fwnode);
404
405 return property_entry_read_string_array(swnode->node->properties,
406 propname, val, nval);
407}
408
409static const char *
410software_node_get_name(const struct fwnode_handle *fwnode)
411{
412 const struct swnode *swnode = to_swnode(fwnode);
413
414 if (!swnode)
415 return "(null)";
416
417 return kobject_name(&swnode->kobj);
418}
419
420static const char *
421software_node_get_name_prefix(const struct fwnode_handle *fwnode)
422{
423 struct fwnode_handle *parent;
424 const char *prefix;
425
426 parent = fwnode_get_parent(fwnode);
427 if (!parent)
428 return "";
429
430
431 while (is_software_node(parent))
432 parent = fwnode_get_next_parent(parent);
433
434 prefix = fwnode_get_name_prefix(parent);
435 fwnode_handle_put(parent);
436
437
438 return prefix ?: "/";
439}
440
441static struct fwnode_handle *
442software_node_get_parent(const struct fwnode_handle *fwnode)
443{
444 struct swnode *swnode = to_swnode(fwnode);
445
446 if (!swnode || !swnode->parent)
447 return NULL;
448
449 return fwnode_handle_get(&swnode->parent->fwnode);
450}
451
452static struct fwnode_handle *
453software_node_get_next_child(const struct fwnode_handle *fwnode,
454 struct fwnode_handle *child)
455{
456 struct swnode *p = to_swnode(fwnode);
457 struct swnode *c = to_swnode(child);
458
459 if (!p || list_empty(&p->children) ||
460 (c && list_is_last(&c->entry, &p->children))) {
461 fwnode_handle_put(child);
462 return NULL;
463 }
464
465 if (c)
466 c = list_next_entry(c, entry);
467 else
468 c = list_first_entry(&p->children, struct swnode, entry);
469
470 fwnode_handle_put(child);
471 return fwnode_handle_get(&c->fwnode);
472}
473
474static struct fwnode_handle *
475software_node_get_named_child_node(const struct fwnode_handle *fwnode,
476 const char *childname)
477{
478 struct swnode *swnode = to_swnode(fwnode);
479 struct swnode *child;
480
481 if (!swnode || list_empty(&swnode->children))
482 return NULL;
483
484 list_for_each_entry(child, &swnode->children, entry) {
485 if (!strcmp(childname, kobject_name(&child->kobj))) {
486 kobject_get(&child->kobj);
487 return &child->fwnode;
488 }
489 }
490 return NULL;
491}
492
493static int
494software_node_get_reference_args(const struct fwnode_handle *fwnode,
495 const char *propname, const char *nargs_prop,
496 unsigned int nargs, unsigned int index,
497 struct fwnode_reference_args *args)
498{
499 struct swnode *swnode = to_swnode(fwnode);
500 const struct software_node_ref_args *ref_array;
501 const struct software_node_ref_args *ref;
502 const struct property_entry *prop;
503 struct fwnode_handle *refnode;
504 u32 nargs_prop_val;
505 int error;
506 int i;
507
508 if (!swnode)
509 return -ENOENT;
510
511 prop = property_entry_get(swnode->node->properties, propname);
512 if (!prop)
513 return -ENOENT;
514
515 if (prop->type != DEV_PROP_REF)
516 return -EINVAL;
517
518
519
520
521
522 if (prop->is_inline)
523 return -EINVAL;
524
525 if (index * sizeof(*ref) >= prop->length)
526 return -ENOENT;
527
528 ref_array = prop->pointer;
529 ref = &ref_array[index];
530
531 refnode = software_node_fwnode(ref->node);
532 if (!refnode)
533 return -ENOENT;
534
535 if (nargs_prop) {
536 error = property_entry_read_int_array(swnode->node->properties,
537 nargs_prop, sizeof(u32),
538 &nargs_prop_val, 1);
539 if (error)
540 return error;
541
542 nargs = nargs_prop_val;
543 }
544
545 if (nargs > NR_FWNODE_REFERENCE_ARGS)
546 return -EINVAL;
547
548 args->fwnode = software_node_get(refnode);
549 args->nargs = nargs;
550
551 for (i = 0; i < nargs; i++)
552 args->args[i] = ref->args[i];
553
554 return 0;
555}
556
557static struct fwnode_handle *
558swnode_graph_find_next_port(const struct fwnode_handle *parent,
559 struct fwnode_handle *port)
560{
561 struct fwnode_handle *old = port;
562
563 while ((port = software_node_get_next_child(parent, old))) {
564
565
566
567
568 if (!strncmp(to_swnode(port)->node->name, "port@",
569 strlen("port@")))
570 return port;
571 old = port;
572 }
573
574 return NULL;
575}
576
577static struct fwnode_handle *
578software_node_graph_get_next_endpoint(const struct fwnode_handle *fwnode,
579 struct fwnode_handle *endpoint)
580{
581 struct swnode *swnode = to_swnode(fwnode);
582 struct fwnode_handle *parent;
583 struct fwnode_handle *port;
584
585 if (!swnode)
586 return NULL;
587
588 if (endpoint) {
589 port = software_node_get_parent(endpoint);
590 parent = software_node_get_parent(port);
591 } else {
592 parent = software_node_get_named_child_node(fwnode, "ports");
593 if (!parent)
594 parent = software_node_get(&swnode->fwnode);
595
596 port = swnode_graph_find_next_port(parent, NULL);
597 }
598
599 for (; port; port = swnode_graph_find_next_port(parent, port)) {
600 endpoint = software_node_get_next_child(port, endpoint);
601 if (endpoint) {
602 fwnode_handle_put(port);
603 break;
604 }
605 }
606
607 fwnode_handle_put(parent);
608
609 return endpoint;
610}
611
612static struct fwnode_handle *
613software_node_graph_get_remote_endpoint(const struct fwnode_handle *fwnode)
614{
615 struct swnode *swnode = to_swnode(fwnode);
616 const struct software_node_ref_args *ref;
617 const struct property_entry *prop;
618
619 if (!swnode)
620 return NULL;
621
622 prop = property_entry_get(swnode->node->properties, "remote-endpoint");
623 if (!prop || prop->type != DEV_PROP_REF || prop->is_inline)
624 return NULL;
625
626 ref = prop->pointer;
627
628 return software_node_get(software_node_fwnode(ref[0].node));
629}
630
631static struct fwnode_handle *
632software_node_graph_get_port_parent(struct fwnode_handle *fwnode)
633{
634 struct swnode *swnode = to_swnode(fwnode);
635
636 swnode = swnode->parent;
637 if (swnode && !strcmp(swnode->node->name, "ports"))
638 swnode = swnode->parent;
639
640 return swnode ? software_node_get(&swnode->fwnode) : NULL;
641}
642
643static int
644software_node_graph_parse_endpoint(const struct fwnode_handle *fwnode,
645 struct fwnode_endpoint *endpoint)
646{
647 struct swnode *swnode = to_swnode(fwnode);
648 const char *parent_name = swnode->parent->node->name;
649 int ret;
650
651 if (strlen("port@") >= strlen(parent_name) ||
652 strncmp(parent_name, "port@", strlen("port@")))
653 return -EINVAL;
654
655
656 ret = kstrtou32(parent_name + strlen("port@"), 10, &endpoint->port);
657 if (ret)
658 return ret;
659
660 endpoint->id = swnode->id;
661 endpoint->local_fwnode = fwnode;
662
663 return 0;
664}
665
666static const struct fwnode_operations software_node_ops = {
667 .get = software_node_get,
668 .put = software_node_put,
669 .property_present = software_node_property_present,
670 .property_read_int_array = software_node_read_int_array,
671 .property_read_string_array = software_node_read_string_array,
672 .get_name = software_node_get_name,
673 .get_name_prefix = software_node_get_name_prefix,
674 .get_parent = software_node_get_parent,
675 .get_next_child_node = software_node_get_next_child,
676 .get_named_child_node = software_node_get_named_child_node,
677 .get_reference_args = software_node_get_reference_args,
678 .graph_get_next_endpoint = software_node_graph_get_next_endpoint,
679 .graph_get_remote_endpoint = software_node_graph_get_remote_endpoint,
680 .graph_get_port_parent = software_node_graph_get_port_parent,
681 .graph_parse_endpoint = software_node_graph_parse_endpoint,
682};
683
684
685
686
687
688
689
690
691
692
693
694
695
696const struct software_node *
697software_node_find_by_name(const struct software_node *parent, const char *name)
698{
699 struct swnode *swnode = NULL;
700 struct kobject *k;
701
702 if (!name)
703 return NULL;
704
705 spin_lock(&swnode_kset->list_lock);
706
707 list_for_each_entry(k, &swnode_kset->list, entry) {
708 swnode = kobj_to_swnode(k);
709 if (parent == swnode->node->parent && swnode->node->name &&
710 !strcmp(name, swnode->node->name)) {
711 kobject_get(&swnode->kobj);
712 break;
713 }
714 swnode = NULL;
715 }
716
717 spin_unlock(&swnode_kset->list_lock);
718
719 return swnode ? swnode->node : NULL;
720}
721EXPORT_SYMBOL_GPL(software_node_find_by_name);
722
723static struct software_node *software_node_alloc(const struct property_entry *properties)
724{
725 struct property_entry *props;
726 struct software_node *node;
727
728 props = property_entries_dup(properties);
729 if (IS_ERR(props))
730 return ERR_CAST(props);
731
732 node = kzalloc(sizeof(*node), GFP_KERNEL);
733 if (!node) {
734 property_entries_free(props);
735 return ERR_PTR(-ENOMEM);
736 }
737
738 node->properties = props;
739
740 return node;
741}
742
743static void software_node_free(const struct software_node *node)
744{
745 property_entries_free(node->properties);
746 kfree(node);
747}
748
749static void software_node_release(struct kobject *kobj)
750{
751 struct swnode *swnode = kobj_to_swnode(kobj);
752
753 if (swnode->parent) {
754 ida_simple_remove(&swnode->parent->child_ids, swnode->id);
755 list_del(&swnode->entry);
756 } else {
757 ida_simple_remove(&swnode_root_ids, swnode->id);
758 }
759
760 if (swnode->allocated)
761 software_node_free(swnode->node);
762
763 ida_destroy(&swnode->child_ids);
764 kfree(swnode);
765}
766
767static struct kobj_type software_node_type = {
768 .release = software_node_release,
769 .sysfs_ops = &kobj_sysfs_ops,
770};
771
772static struct fwnode_handle *
773swnode_register(const struct software_node *node, struct swnode *parent,
774 unsigned int allocated)
775{
776 struct swnode *swnode;
777 int ret;
778
779 swnode = kzalloc(sizeof(*swnode), GFP_KERNEL);
780 if (!swnode)
781 return ERR_PTR(-ENOMEM);
782
783 ret = ida_simple_get(parent ? &parent->child_ids : &swnode_root_ids,
784 0, 0, GFP_KERNEL);
785 if (ret < 0) {
786 kfree(swnode);
787 return ERR_PTR(ret);
788 }
789
790 swnode->id = ret;
791 swnode->node = node;
792 swnode->parent = parent;
793 swnode->kobj.kset = swnode_kset;
794 fwnode_init(&swnode->fwnode, &software_node_ops);
795
796 ida_init(&swnode->child_ids);
797 INIT_LIST_HEAD(&swnode->entry);
798 INIT_LIST_HEAD(&swnode->children);
799
800 if (node->name)
801 ret = kobject_init_and_add(&swnode->kobj, &software_node_type,
802 parent ? &parent->kobj : NULL,
803 "%s", node->name);
804 else
805 ret = kobject_init_and_add(&swnode->kobj, &software_node_type,
806 parent ? &parent->kobj : NULL,
807 "node%d", swnode->id);
808 if (ret) {
809 kobject_put(&swnode->kobj);
810 return ERR_PTR(ret);
811 }
812
813
814
815
816
817 swnode->allocated = allocated;
818
819 if (parent)
820 list_add_tail(&swnode->entry, &parent->children);
821
822 kobject_uevent(&swnode->kobj, KOBJ_ADD);
823 return &swnode->fwnode;
824}
825
826
827
828
829
830
831
832
833
834
835
836int software_node_register_nodes(const struct software_node *nodes)
837{
838 int ret;
839 int i;
840
841 for (i = 0; nodes[i].name; i++) {
842 const struct software_node *parent = nodes[i].parent;
843
844 if (parent && !software_node_to_swnode(parent)) {
845 ret = -EINVAL;
846 goto err_unregister_nodes;
847 }
848
849 ret = software_node_register(&nodes[i]);
850 if (ret)
851 goto err_unregister_nodes;
852 }
853
854 return 0;
855
856err_unregister_nodes:
857 software_node_unregister_nodes(nodes);
858 return ret;
859}
860EXPORT_SYMBOL_GPL(software_node_register_nodes);
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875void software_node_unregister_nodes(const struct software_node *nodes)
876{
877 unsigned int i = 0;
878
879 while (nodes[i].name)
880 i++;
881
882 while (i--)
883 software_node_unregister(&nodes[i]);
884}
885EXPORT_SYMBOL_GPL(software_node_unregister_nodes);
886
887
888
889
890
891
892
893
894
895
896
897int software_node_register_node_group(const struct software_node **node_group)
898{
899 unsigned int i;
900 int ret;
901
902 if (!node_group)
903 return 0;
904
905 for (i = 0; node_group[i]; i++) {
906 ret = software_node_register(node_group[i]);
907 if (ret) {
908 software_node_unregister_node_group(node_group);
909 return ret;
910 }
911 }
912
913 return 0;
914}
915EXPORT_SYMBOL_GPL(software_node_register_node_group);
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930void software_node_unregister_node_group(
931 const struct software_node **node_group)
932{
933 unsigned int i = 0;
934
935 if (!node_group)
936 return;
937
938 while (node_group[i])
939 i++;
940
941 while (i--)
942 software_node_unregister(node_group[i]);
943}
944EXPORT_SYMBOL_GPL(software_node_unregister_node_group);
945
946
947
948
949
950int software_node_register(const struct software_node *node)
951{
952 struct swnode *parent = software_node_to_swnode(node->parent);
953
954 if (software_node_to_swnode(node))
955 return -EEXIST;
956
957 if (node->parent && !parent)
958 return -EINVAL;
959
960 return PTR_ERR_OR_ZERO(swnode_register(node, parent, 0));
961}
962EXPORT_SYMBOL_GPL(software_node_register);
963
964
965
966
967
968void software_node_unregister(const struct software_node *node)
969{
970 struct swnode *swnode;
971
972 swnode = software_node_to_swnode(node);
973 if (swnode)
974 fwnode_remove_software_node(&swnode->fwnode);
975}
976EXPORT_SYMBOL_GPL(software_node_unregister);
977
978struct fwnode_handle *
979fwnode_create_software_node(const struct property_entry *properties,
980 const struct fwnode_handle *parent)
981{
982 struct fwnode_handle *fwnode;
983 struct software_node *node;
984 struct swnode *p;
985
986 if (IS_ERR(parent))
987 return ERR_CAST(parent);
988
989 p = to_swnode(parent);
990 if (parent && !p)
991 return ERR_PTR(-EINVAL);
992
993 node = software_node_alloc(properties);
994 if (IS_ERR(node))
995 return ERR_CAST(node);
996
997 node->parent = p ? p->node : NULL;
998
999 fwnode = swnode_register(node, p, 1);
1000 if (IS_ERR(fwnode))
1001 software_node_free(node);
1002
1003 return fwnode;
1004}
1005EXPORT_SYMBOL_GPL(fwnode_create_software_node);
1006
1007void fwnode_remove_software_node(struct fwnode_handle *fwnode)
1008{
1009 struct swnode *swnode = to_swnode(fwnode);
1010
1011 if (!swnode)
1012 return;
1013
1014 kobject_put(&swnode->kobj);
1015}
1016EXPORT_SYMBOL_GPL(fwnode_remove_software_node);
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027int device_add_software_node(struct device *dev, const struct software_node *node)
1028{
1029 struct swnode *swnode;
1030 int ret;
1031
1032
1033 if (dev_to_swnode(dev))
1034 return -EBUSY;
1035
1036 swnode = software_node_to_swnode(node);
1037 if (swnode) {
1038 kobject_get(&swnode->kobj);
1039 } else {
1040 ret = software_node_register(node);
1041 if (ret)
1042 return ret;
1043
1044 swnode = software_node_to_swnode(node);
1045 }
1046
1047 set_secondary_fwnode(dev, &swnode->fwnode);
1048
1049
1050
1051
1052
1053
1054
1055 if (device_is_registered(dev))
1056 software_node_notify(dev, KOBJ_ADD);
1057
1058 return 0;
1059}
1060EXPORT_SYMBOL_GPL(device_add_software_node);
1061
1062
1063
1064
1065
1066
1067
1068void device_remove_software_node(struct device *dev)
1069{
1070 struct swnode *swnode;
1071
1072 swnode = dev_to_swnode(dev);
1073 if (!swnode)
1074 return;
1075
1076 if (device_is_registered(dev))
1077 software_node_notify(dev, KOBJ_REMOVE);
1078 set_secondary_fwnode(dev, NULL);
1079 kobject_put(&swnode->kobj);
1080}
1081EXPORT_SYMBOL_GPL(device_remove_software_node);
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099int device_create_managed_software_node(struct device *dev,
1100 const struct property_entry *properties,
1101 const struct software_node *parent)
1102{
1103 struct fwnode_handle *p = software_node_fwnode(parent);
1104 struct fwnode_handle *fwnode;
1105
1106 if (parent && !p)
1107 return -EINVAL;
1108
1109 fwnode = fwnode_create_software_node(properties, p);
1110 if (IS_ERR(fwnode))
1111 return PTR_ERR(fwnode);
1112
1113 to_swnode(fwnode)->managed = true;
1114 set_secondary_fwnode(dev, fwnode);
1115
1116 return 0;
1117}
1118EXPORT_SYMBOL_GPL(device_create_managed_software_node);
1119
1120int software_node_notify(struct device *dev, unsigned long action)
1121{
1122 struct swnode *swnode;
1123 int ret;
1124
1125 swnode = dev_to_swnode(dev);
1126 if (!swnode)
1127 return 0;
1128
1129 switch (action) {
1130 case KOBJ_ADD:
1131 ret = sysfs_create_link(&dev->kobj, &swnode->kobj, "software_node");
1132 if (ret)
1133 break;
1134
1135 ret = sysfs_create_link(&swnode->kobj, &dev->kobj,
1136 dev_name(dev));
1137 if (ret) {
1138 sysfs_remove_link(&dev->kobj, "software_node");
1139 break;
1140 }
1141 kobject_get(&swnode->kobj);
1142 break;
1143 case KOBJ_REMOVE:
1144 sysfs_remove_link(&swnode->kobj, dev_name(dev));
1145 sysfs_remove_link(&dev->kobj, "software_node");
1146 kobject_put(&swnode->kobj);
1147
1148 if (swnode->managed) {
1149 set_secondary_fwnode(dev, NULL);
1150 kobject_put(&swnode->kobj);
1151 }
1152 break;
1153 default:
1154 break;
1155 }
1156
1157 return 0;
1158}
1159
1160static int __init software_node_init(void)
1161{
1162 swnode_kset = kset_create_and_add("software_nodes", NULL, kernel_kobj);
1163 if (!swnode_kset)
1164 return -ENOMEM;
1165 return 0;
1166}
1167postcore_initcall(software_node_init);
1168
1169static void __exit software_node_exit(void)
1170{
1171 ida_destroy(&swnode_root_ids);
1172 kset_unregister(swnode_kset);
1173}
1174__exitcall(software_node_exit);
1175