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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
14#include "base.h"
15
16struct swnode {
17 struct kobject kobj;
18 struct fwnode_handle fwnode;
19 const struct software_node *node;
20 int id;
21
22
23 struct ida child_ids;
24 struct list_head entry;
25 struct list_head children;
26 struct swnode *parent;
27
28 unsigned int allocated:1;
29 unsigned int managed:1;
30};
31
32static DEFINE_IDA(swnode_root_ids);
33static struct kset *swnode_kset;
34
35#define kobj_to_swnode(_kobj_) container_of(_kobj_, struct swnode, kobj)
36
37static const struct fwnode_operations software_node_ops;
38
39bool is_software_node(const struct fwnode_handle *fwnode)
40{
41 return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &software_node_ops;
42}
43EXPORT_SYMBOL_GPL(is_software_node);
44
45#define to_swnode(__fwnode) \
46 ({ \
47 typeof(__fwnode) __to_swnode_fwnode = __fwnode; \
48 \
49 is_software_node(__to_swnode_fwnode) ? \
50 container_of(__to_swnode_fwnode, \
51 struct swnode, fwnode) : NULL; \
52 })
53
54static inline struct swnode *dev_to_swnode(struct device *dev)
55{
56 struct fwnode_handle *fwnode = dev_fwnode(dev);
57
58 if (!fwnode)
59 return NULL;
60
61 if (!is_software_node(fwnode))
62 fwnode = fwnode->secondary;
63
64 return to_swnode(fwnode);
65}
66
67static struct swnode *
68software_node_to_swnode(const struct software_node *node)
69{
70 struct swnode *swnode = NULL;
71 struct kobject *k;
72
73 if (!node)
74 return NULL;
75
76 spin_lock(&swnode_kset->list_lock);
77
78 list_for_each_entry(k, &swnode_kset->list, entry) {
79 swnode = kobj_to_swnode(k);
80 if (swnode->node == node)
81 break;
82 swnode = NULL;
83 }
84
85 spin_unlock(&swnode_kset->list_lock);
86
87 return swnode;
88}
89
90const struct software_node *to_software_node(const struct fwnode_handle *fwnode)
91{
92 const struct swnode *swnode = to_swnode(fwnode);
93
94 return swnode ? swnode->node : NULL;
95}
96EXPORT_SYMBOL_GPL(to_software_node);
97
98struct fwnode_handle *software_node_fwnode(const struct software_node *node)
99{
100 struct swnode *swnode = software_node_to_swnode(node);
101
102 return swnode ? &swnode->fwnode : NULL;
103}
104EXPORT_SYMBOL_GPL(software_node_fwnode);
105
106
107
108
109static const struct property_entry *
110property_entry_get(const struct property_entry *prop, const char *name)
111{
112 if (!prop)
113 return NULL;
114
115 for (; prop->name; prop++)
116 if (!strcmp(name, prop->name))
117 return prop;
118
119 return NULL;
120}
121
122static const void *property_get_pointer(const struct property_entry *prop)
123{
124 if (!prop->length)
125 return NULL;
126
127 return prop->is_inline ? &prop->value : prop->pointer;
128}
129
130static const void *property_entry_find(const struct property_entry *props,
131 const char *propname, size_t length)
132{
133 const struct property_entry *prop;
134 const void *pointer;
135
136 prop = property_entry_get(props, propname);
137 if (!prop)
138 return ERR_PTR(-EINVAL);
139 pointer = property_get_pointer(prop);
140 if (!pointer)
141 return ERR_PTR(-ENODATA);
142 if (length > prop->length)
143 return ERR_PTR(-EOVERFLOW);
144 return pointer;
145}
146
147static int
148property_entry_count_elems_of_size(const struct property_entry *props,
149 const char *propname, size_t length)
150{
151 const struct property_entry *prop;
152
153 prop = property_entry_get(props, propname);
154 if (!prop)
155 return -EINVAL;
156
157 return prop->length / length;
158}
159
160static int property_entry_read_int_array(const struct property_entry *props,
161 const char *name,
162 unsigned int elem_size, void *val,
163 size_t nval)
164{
165 const void *pointer;
166 size_t length;
167
168 if (!val)
169 return property_entry_count_elems_of_size(props, name,
170 elem_size);
171
172 if (!is_power_of_2(elem_size) || elem_size > sizeof(u64))
173 return -ENXIO;
174
175 length = nval * elem_size;
176
177 pointer = property_entry_find(props, name, length);
178 if (IS_ERR(pointer))
179 return PTR_ERR(pointer);
180
181 memcpy(val, pointer, length);
182 return 0;
183}
184
185static int property_entry_read_string_array(const struct property_entry *props,
186 const char *propname,
187 const char **strings, size_t nval)
188{
189 const void *pointer;
190 size_t length;
191 int array_len;
192
193
194 array_len = property_entry_count_elems_of_size(props, propname,
195 sizeof(const char *));
196 if (array_len < 0)
197 return array_len;
198
199
200 if (!strings)
201 return array_len;
202
203 array_len = min_t(size_t, nval, array_len);
204 length = array_len * sizeof(*strings);
205
206 pointer = property_entry_find(props, propname, length);
207 if (IS_ERR(pointer))
208 return PTR_ERR(pointer);
209
210 memcpy(strings, pointer, length);
211
212 return array_len;
213}
214
215static void property_entry_free_data(const struct property_entry *p)
216{
217 const char * const *src_str;
218 size_t i, nval;
219
220 if (p->type == DEV_PROP_STRING) {
221 src_str = property_get_pointer(p);
222 nval = p->length / sizeof(*src_str);
223 for (i = 0; i < nval; i++)
224 kfree(src_str[i]);
225 }
226
227 if (!p->is_inline)
228 kfree(p->pointer);
229
230 kfree(p->name);
231}
232
233static bool property_copy_string_array(const char **dst_ptr,
234 const char * const *src_ptr,
235 size_t nval)
236{
237 int i;
238
239 for (i = 0; i < nval; i++) {
240 dst_ptr[i] = kstrdup(src_ptr[i], GFP_KERNEL);
241 if (!dst_ptr[i] && src_ptr[i]) {
242 while (--i >= 0)
243 kfree(dst_ptr[i]);
244 return false;
245 }
246 }
247
248 return true;
249}
250
251static int property_entry_copy_data(struct property_entry *dst,
252 const struct property_entry *src)
253{
254 const void *pointer = property_get_pointer(src);
255 void *dst_ptr;
256 size_t nval;
257
258
259
260
261
262 if (!src->is_inline && !src->length)
263 return -ENODATA;
264
265
266
267
268
269 if (src->type == DEV_PROP_REF && src->is_inline)
270 return -EINVAL;
271
272 if (src->length <= sizeof(dst->value)) {
273 dst_ptr = &dst->value;
274 dst->is_inline = true;
275 } else {
276 dst_ptr = kmalloc(src->length, GFP_KERNEL);
277 if (!dst_ptr)
278 return -ENOMEM;
279 dst->pointer = dst_ptr;
280 }
281
282 if (src->type == DEV_PROP_STRING) {
283 nval = src->length / sizeof(const char *);
284 if (!property_copy_string_array(dst_ptr, pointer, nval)) {
285 if (!dst->is_inline)
286 kfree(dst->pointer);
287 return -ENOMEM;
288 }
289 } else {
290 memcpy(dst_ptr, pointer, src->length);
291 }
292
293 dst->length = src->length;
294 dst->type = src->type;
295 dst->name = kstrdup(src->name, GFP_KERNEL);
296 if (!dst->name) {
297 property_entry_free_data(dst);
298 return -ENOMEM;
299 }
300
301 return 0;
302}
303
304
305
306
307
308
309
310
311struct property_entry *
312property_entries_dup(const struct property_entry *properties)
313{
314 struct property_entry *p;
315 int i, n = 0;
316 int ret;
317
318 if (!properties)
319 return NULL;
320
321 while (properties[n].name)
322 n++;
323
324 p = kcalloc(n + 1, sizeof(*p), GFP_KERNEL);
325 if (!p)
326 return ERR_PTR(-ENOMEM);
327
328 for (i = 0; i < n; i++) {
329 ret = property_entry_copy_data(&p[i], &properties[i]);
330 if (ret) {
331 while (--i >= 0)
332 property_entry_free_data(&p[i]);
333 kfree(p);
334 return ERR_PTR(ret);
335 }
336 }
337
338 return p;
339}
340EXPORT_SYMBOL_GPL(property_entries_dup);
341
342
343
344
345
346
347
348
349void property_entries_free(const struct property_entry *properties)
350{
351 const struct property_entry *p;
352
353 if (!properties)
354 return;
355
356 for (p = properties; p->name; p++)
357 property_entry_free_data(p);
358
359 kfree(properties);
360}
361EXPORT_SYMBOL_GPL(property_entries_free);
362
363
364
365
366static struct fwnode_handle *software_node_get(struct fwnode_handle *fwnode)
367{
368 struct swnode *swnode = to_swnode(fwnode);
369
370 kobject_get(&swnode->kobj);
371
372 return &swnode->fwnode;
373}
374
375static void software_node_put(struct fwnode_handle *fwnode)
376{
377 struct swnode *swnode = to_swnode(fwnode);
378
379 kobject_put(&swnode->kobj);
380}
381
382static bool software_node_property_present(const struct fwnode_handle *fwnode,
383 const char *propname)
384{
385 struct swnode *swnode = to_swnode(fwnode);
386
387 return !!property_entry_get(swnode->node->properties, propname);
388}
389
390static int software_node_read_int_array(const struct fwnode_handle *fwnode,
391 const char *propname,
392 unsigned int elem_size, void *val,
393 size_t nval)
394{
395 struct swnode *swnode = to_swnode(fwnode);
396
397 return property_entry_read_int_array(swnode->node->properties, propname,
398 elem_size, val, nval);
399}
400
401static int software_node_read_string_array(const struct fwnode_handle *fwnode,
402 const char *propname,
403 const char **val, size_t nval)
404{
405 struct swnode *swnode = to_swnode(fwnode);
406
407 return property_entry_read_string_array(swnode->node->properties,
408 propname, val, nval);
409}
410
411static const char *
412software_node_get_name(const struct fwnode_handle *fwnode)
413{
414 const struct swnode *swnode = to_swnode(fwnode);
415
416 if (!swnode)
417 return "(null)";
418
419 return kobject_name(&swnode->kobj);
420}
421
422static const char *
423software_node_get_name_prefix(const struct fwnode_handle *fwnode)
424{
425 struct fwnode_handle *parent;
426 const char *prefix;
427
428 parent = fwnode_get_parent(fwnode);
429 if (!parent)
430 return "";
431
432
433 while (is_software_node(parent))
434 parent = fwnode_get_next_parent(parent);
435
436 prefix = fwnode_get_name_prefix(parent);
437 fwnode_handle_put(parent);
438
439
440 return prefix ?: "/";
441}
442
443static struct fwnode_handle *
444software_node_get_parent(const struct fwnode_handle *fwnode)
445{
446 struct swnode *swnode = to_swnode(fwnode);
447
448 if (!swnode || !swnode->parent)
449 return NULL;
450
451 return fwnode_handle_get(&swnode->parent->fwnode);
452}
453
454static struct fwnode_handle *
455software_node_get_next_child(const struct fwnode_handle *fwnode,
456 struct fwnode_handle *child)
457{
458 struct swnode *p = to_swnode(fwnode);
459 struct swnode *c = to_swnode(child);
460
461 if (!p || list_empty(&p->children) ||
462 (c && list_is_last(&c->entry, &p->children))) {
463 fwnode_handle_put(child);
464 return NULL;
465 }
466
467 if (c)
468 c = list_next_entry(c, entry);
469 else
470 c = list_first_entry(&p->children, struct swnode, entry);
471
472 fwnode_handle_put(child);
473 return fwnode_handle_get(&c->fwnode);
474}
475
476static struct fwnode_handle *
477software_node_get_named_child_node(const struct fwnode_handle *fwnode,
478 const char *childname)
479{
480 struct swnode *swnode = to_swnode(fwnode);
481 struct swnode *child;
482
483 if (!swnode || list_empty(&swnode->children))
484 return NULL;
485
486 list_for_each_entry(child, &swnode->children, entry) {
487 if (!strcmp(childname, kobject_name(&child->kobj))) {
488 kobject_get(&child->kobj);
489 return &child->fwnode;
490 }
491 }
492 return NULL;
493}
494
495static int
496software_node_get_reference_args(const struct fwnode_handle *fwnode,
497 const char *propname, const char *nargs_prop,
498 unsigned int nargs, unsigned int index,
499 struct fwnode_reference_args *args)
500{
501 struct swnode *swnode = to_swnode(fwnode);
502 const struct software_node_ref_args *ref_array;
503 const struct software_node_ref_args *ref;
504 const struct property_entry *prop;
505 struct fwnode_handle *refnode;
506 u32 nargs_prop_val;
507 int error;
508 int i;
509
510 if (!swnode)
511 return -ENOENT;
512
513 prop = property_entry_get(swnode->node->properties, propname);
514 if (!prop)
515 return -ENOENT;
516
517 if (prop->type != DEV_PROP_REF)
518 return -EINVAL;
519
520
521
522
523
524 if (prop->is_inline)
525 return -EINVAL;
526
527 if (index * sizeof(*ref) >= prop->length)
528 return -ENOENT;
529
530 ref_array = prop->pointer;
531 ref = &ref_array[index];
532
533 refnode = software_node_fwnode(ref->node);
534 if (!refnode)
535 return -ENOENT;
536
537 if (nargs_prop) {
538 error = property_entry_read_int_array(swnode->node->properties,
539 nargs_prop, sizeof(u32),
540 &nargs_prop_val, 1);
541 if (error)
542 return error;
543
544 nargs = nargs_prop_val;
545 }
546
547 if (nargs > NR_FWNODE_REFERENCE_ARGS)
548 return -EINVAL;
549
550 args->fwnode = software_node_get(refnode);
551 args->nargs = nargs;
552
553 for (i = 0; i < nargs; i++)
554 args->args[i] = ref->args[i];
555
556 return 0;
557}
558
559static struct fwnode_handle *
560swnode_graph_find_next_port(const struct fwnode_handle *parent,
561 struct fwnode_handle *port)
562{
563 struct fwnode_handle *old = port;
564
565 while ((port = software_node_get_next_child(parent, old))) {
566
567
568
569
570 if (!strncmp(to_swnode(port)->node->name, "port@",
571 strlen("port@")))
572 return port;
573 old = port;
574 }
575
576 return NULL;
577}
578
579static struct fwnode_handle *
580software_node_graph_get_next_endpoint(const struct fwnode_handle *fwnode,
581 struct fwnode_handle *endpoint)
582{
583 struct swnode *swnode = to_swnode(fwnode);
584 struct fwnode_handle *parent;
585 struct fwnode_handle *port;
586
587 if (!swnode)
588 return NULL;
589
590 if (endpoint) {
591 port = software_node_get_parent(endpoint);
592 parent = software_node_get_parent(port);
593 } else {
594 parent = software_node_get_named_child_node(fwnode, "ports");
595 if (!parent)
596 parent = software_node_get(&swnode->fwnode);
597
598 port = swnode_graph_find_next_port(parent, NULL);
599 }
600
601 for (; port; port = swnode_graph_find_next_port(parent, port)) {
602 endpoint = software_node_get_next_child(port, endpoint);
603 if (endpoint) {
604 fwnode_handle_put(port);
605 break;
606 }
607 }
608
609 fwnode_handle_put(parent);
610
611 return endpoint;
612}
613
614static struct fwnode_handle *
615software_node_graph_get_remote_endpoint(const struct fwnode_handle *fwnode)
616{
617 struct swnode *swnode = to_swnode(fwnode);
618 const struct software_node_ref_args *ref;
619 const struct property_entry *prop;
620
621 if (!swnode)
622 return NULL;
623
624 prop = property_entry_get(swnode->node->properties, "remote-endpoint");
625 if (!prop || prop->type != DEV_PROP_REF || prop->is_inline)
626 return NULL;
627
628 ref = prop->pointer;
629
630 return software_node_get(software_node_fwnode(ref[0].node));
631}
632
633static struct fwnode_handle *
634software_node_graph_get_port_parent(struct fwnode_handle *fwnode)
635{
636 struct swnode *swnode = to_swnode(fwnode);
637
638 swnode = swnode->parent;
639 if (swnode && !strcmp(swnode->node->name, "ports"))
640 swnode = swnode->parent;
641
642 return swnode ? software_node_get(&swnode->fwnode) : NULL;
643}
644
645static int
646software_node_graph_parse_endpoint(const struct fwnode_handle *fwnode,
647 struct fwnode_endpoint *endpoint)
648{
649 struct swnode *swnode = to_swnode(fwnode);
650 const char *parent_name = swnode->parent->node->name;
651 int ret;
652
653 if (strlen("port@") >= strlen(parent_name) ||
654 strncmp(parent_name, "port@", strlen("port@")))
655 return -EINVAL;
656
657
658 ret = kstrtou32(parent_name + strlen("port@"), 10, &endpoint->port);
659 if (ret)
660 return ret;
661
662 endpoint->id = swnode->id;
663 endpoint->local_fwnode = fwnode;
664
665 return 0;
666}
667
668static const struct fwnode_operations software_node_ops = {
669 .get = software_node_get,
670 .put = software_node_put,
671 .property_present = software_node_property_present,
672 .property_read_int_array = software_node_read_int_array,
673 .property_read_string_array = software_node_read_string_array,
674 .get_name = software_node_get_name,
675 .get_name_prefix = software_node_get_name_prefix,
676 .get_parent = software_node_get_parent,
677 .get_next_child_node = software_node_get_next_child,
678 .get_named_child_node = software_node_get_named_child_node,
679 .get_reference_args = software_node_get_reference_args,
680 .graph_get_next_endpoint = software_node_graph_get_next_endpoint,
681 .graph_get_remote_endpoint = software_node_graph_get_remote_endpoint,
682 .graph_get_port_parent = software_node_graph_get_port_parent,
683 .graph_parse_endpoint = software_node_graph_parse_endpoint,
684};
685
686
687
688
689
690
691
692
693
694
695
696
697
698const struct software_node *
699software_node_find_by_name(const struct software_node *parent, const char *name)
700{
701 struct swnode *swnode = NULL;
702 struct kobject *k;
703
704 if (!name)
705 return NULL;
706
707 spin_lock(&swnode_kset->list_lock);
708
709 list_for_each_entry(k, &swnode_kset->list, entry) {
710 swnode = kobj_to_swnode(k);
711 if (parent == swnode->node->parent && swnode->node->name &&
712 !strcmp(name, swnode->node->name)) {
713 kobject_get(&swnode->kobj);
714 break;
715 }
716 swnode = NULL;
717 }
718
719 spin_unlock(&swnode_kset->list_lock);
720
721 return swnode ? swnode->node : NULL;
722}
723EXPORT_SYMBOL_GPL(software_node_find_by_name);
724
725static struct software_node *software_node_alloc(const struct property_entry *properties)
726{
727 struct property_entry *props;
728 struct software_node *node;
729
730 props = property_entries_dup(properties);
731 if (IS_ERR(props))
732 return ERR_CAST(props);
733
734 node = kzalloc(sizeof(*node), GFP_KERNEL);
735 if (!node) {
736 property_entries_free(props);
737 return ERR_PTR(-ENOMEM);
738 }
739
740 node->properties = props;
741
742 return node;
743}
744
745static void software_node_free(const struct software_node *node)
746{
747 property_entries_free(node->properties);
748 kfree(node);
749}
750
751static void software_node_release(struct kobject *kobj)
752{
753 struct swnode *swnode = kobj_to_swnode(kobj);
754
755 if (swnode->parent) {
756 ida_simple_remove(&swnode->parent->child_ids, swnode->id);
757 list_del(&swnode->entry);
758 } else {
759 ida_simple_remove(&swnode_root_ids, swnode->id);
760 }
761
762 if (swnode->allocated)
763 software_node_free(swnode->node);
764
765 ida_destroy(&swnode->child_ids);
766 kfree(swnode);
767}
768
769static struct kobj_type software_node_type = {
770 .release = software_node_release,
771 .sysfs_ops = &kobj_sysfs_ops,
772};
773
774static struct fwnode_handle *
775swnode_register(const struct software_node *node, struct swnode *parent,
776 unsigned int allocated)
777{
778 struct swnode *swnode;
779 int ret;
780
781 swnode = kzalloc(sizeof(*swnode), GFP_KERNEL);
782 if (!swnode)
783 return ERR_PTR(-ENOMEM);
784
785 ret = ida_simple_get(parent ? &parent->child_ids : &swnode_root_ids,
786 0, 0, GFP_KERNEL);
787 if (ret < 0) {
788 kfree(swnode);
789 return ERR_PTR(ret);
790 }
791
792 swnode->id = ret;
793 swnode->node = node;
794 swnode->parent = parent;
795 swnode->kobj.kset = swnode_kset;
796 fwnode_init(&swnode->fwnode, &software_node_ops);
797
798 ida_init(&swnode->child_ids);
799 INIT_LIST_HEAD(&swnode->entry);
800 INIT_LIST_HEAD(&swnode->children);
801
802 if (node->name)
803 ret = kobject_init_and_add(&swnode->kobj, &software_node_type,
804 parent ? &parent->kobj : NULL,
805 "%s", node->name);
806 else
807 ret = kobject_init_and_add(&swnode->kobj, &software_node_type,
808 parent ? &parent->kobj : NULL,
809 "node%d", swnode->id);
810 if (ret) {
811 kobject_put(&swnode->kobj);
812 return ERR_PTR(ret);
813 }
814
815
816
817
818
819 swnode->allocated = allocated;
820
821 if (parent)
822 list_add_tail(&swnode->entry, &parent->children);
823
824 kobject_uevent(&swnode->kobj, KOBJ_ADD);
825 return &swnode->fwnode;
826}
827
828
829
830
831
832
833
834
835
836
837
838int software_node_register_nodes(const struct software_node *nodes)
839{
840 int ret;
841 int i;
842
843 for (i = 0; nodes[i].name; i++) {
844 const struct software_node *parent = nodes[i].parent;
845
846 if (parent && !software_node_to_swnode(parent)) {
847 ret = -EINVAL;
848 goto err_unregister_nodes;
849 }
850
851 ret = software_node_register(&nodes[i]);
852 if (ret)
853 goto err_unregister_nodes;
854 }
855
856 return 0;
857
858err_unregister_nodes:
859 software_node_unregister_nodes(nodes);
860 return ret;
861}
862EXPORT_SYMBOL_GPL(software_node_register_nodes);
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877void software_node_unregister_nodes(const struct software_node *nodes)
878{
879 unsigned int i = 0;
880
881 while (nodes[i].name)
882 i++;
883
884 while (i--)
885 software_node_unregister(&nodes[i]);
886}
887EXPORT_SYMBOL_GPL(software_node_unregister_nodes);
888
889
890
891
892
893
894
895
896
897
898
899int software_node_register_node_group(const struct software_node **node_group)
900{
901 unsigned int i;
902 int ret;
903
904 if (!node_group)
905 return 0;
906
907 for (i = 0; node_group[i]; i++) {
908 ret = software_node_register(node_group[i]);
909 if (ret) {
910 software_node_unregister_node_group(node_group);
911 return ret;
912 }
913 }
914
915 return 0;
916}
917EXPORT_SYMBOL_GPL(software_node_register_node_group);
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932void software_node_unregister_node_group(
933 const struct software_node **node_group)
934{
935 unsigned int i = 0;
936
937 if (!node_group)
938 return;
939
940 while (node_group[i])
941 i++;
942
943 while (i--)
944 software_node_unregister(node_group[i]);
945}
946EXPORT_SYMBOL_GPL(software_node_unregister_node_group);
947
948
949
950
951
952int software_node_register(const struct software_node *node)
953{
954 struct swnode *parent = software_node_to_swnode(node->parent);
955
956 if (software_node_to_swnode(node))
957 return -EEXIST;
958
959 if (node->parent && !parent)
960 return -EINVAL;
961
962 return PTR_ERR_OR_ZERO(swnode_register(node, parent, 0));
963}
964EXPORT_SYMBOL_GPL(software_node_register);
965
966
967
968
969
970void software_node_unregister(const struct software_node *node)
971{
972 struct swnode *swnode;
973
974 swnode = software_node_to_swnode(node);
975 if (swnode)
976 fwnode_remove_software_node(&swnode->fwnode);
977}
978EXPORT_SYMBOL_GPL(software_node_unregister);
979
980struct fwnode_handle *
981fwnode_create_software_node(const struct property_entry *properties,
982 const struct fwnode_handle *parent)
983{
984 struct fwnode_handle *fwnode;
985 struct software_node *node;
986 struct swnode *p;
987
988 if (IS_ERR(parent))
989 return ERR_CAST(parent);
990
991 p = to_swnode(parent);
992 if (parent && !p)
993 return ERR_PTR(-EINVAL);
994
995 node = software_node_alloc(properties);
996 if (IS_ERR(node))
997 return ERR_CAST(node);
998
999 node->parent = p ? p->node : NULL;
1000
1001 fwnode = swnode_register(node, p, 1);
1002 if (IS_ERR(fwnode))
1003 software_node_free(node);
1004
1005 return fwnode;
1006}
1007EXPORT_SYMBOL_GPL(fwnode_create_software_node);
1008
1009void fwnode_remove_software_node(struct fwnode_handle *fwnode)
1010{
1011 struct swnode *swnode = to_swnode(fwnode);
1012
1013 if (!swnode)
1014 return;
1015
1016 kobject_put(&swnode->kobj);
1017}
1018EXPORT_SYMBOL_GPL(fwnode_remove_software_node);
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029int device_add_software_node(struct device *dev, const struct software_node *node)
1030{
1031 struct swnode *swnode;
1032 int ret;
1033
1034
1035 if (dev_to_swnode(dev))
1036 return -EBUSY;
1037
1038 swnode = software_node_to_swnode(node);
1039 if (swnode) {
1040 kobject_get(&swnode->kobj);
1041 } else {
1042 ret = software_node_register(node);
1043 if (ret)
1044 return ret;
1045
1046 swnode = software_node_to_swnode(node);
1047 }
1048
1049 set_secondary_fwnode(dev, &swnode->fwnode);
1050
1051
1052
1053
1054
1055
1056
1057 if (device_is_registered(dev))
1058 software_node_notify(dev);
1059
1060 return 0;
1061}
1062EXPORT_SYMBOL_GPL(device_add_software_node);
1063
1064
1065
1066
1067
1068
1069
1070void device_remove_software_node(struct device *dev)
1071{
1072 struct swnode *swnode;
1073
1074 swnode = dev_to_swnode(dev);
1075 if (!swnode)
1076 return;
1077
1078 if (device_is_registered(dev))
1079 software_node_notify_remove(dev);
1080
1081 set_secondary_fwnode(dev, NULL);
1082 kobject_put(&swnode->kobj);
1083}
1084EXPORT_SYMBOL_GPL(device_remove_software_node);
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102int device_create_managed_software_node(struct device *dev,
1103 const struct property_entry *properties,
1104 const struct software_node *parent)
1105{
1106 struct fwnode_handle *p = software_node_fwnode(parent);
1107 struct fwnode_handle *fwnode;
1108
1109 if (parent && !p)
1110 return -EINVAL;
1111
1112 fwnode = fwnode_create_software_node(properties, p);
1113 if (IS_ERR(fwnode))
1114 return PTR_ERR(fwnode);
1115
1116 to_swnode(fwnode)->managed = true;
1117 set_secondary_fwnode(dev, fwnode);
1118
1119 if (device_is_registered(dev))
1120 software_node_notify(dev);
1121
1122 return 0;
1123}
1124EXPORT_SYMBOL_GPL(device_create_managed_software_node);
1125
1126void software_node_notify(struct device *dev)
1127{
1128 struct swnode *swnode;
1129 int ret;
1130
1131 swnode = dev_to_swnode(dev);
1132 if (!swnode)
1133 return;
1134
1135 ret = sysfs_create_link(&dev->kobj, &swnode->kobj, "software_node");
1136 if (ret)
1137 return;
1138
1139 ret = sysfs_create_link(&swnode->kobj, &dev->kobj, dev_name(dev));
1140 if (ret) {
1141 sysfs_remove_link(&dev->kobj, "software_node");
1142 return;
1143 }
1144
1145 kobject_get(&swnode->kobj);
1146}
1147
1148void software_node_notify_remove(struct device *dev)
1149{
1150 struct swnode *swnode;
1151
1152 swnode = dev_to_swnode(dev);
1153 if (!swnode)
1154 return;
1155
1156 sysfs_remove_link(&swnode->kobj, dev_name(dev));
1157 sysfs_remove_link(&dev->kobj, "software_node");
1158 kobject_put(&swnode->kobj);
1159
1160 if (swnode->managed) {
1161 set_secondary_fwnode(dev, NULL);
1162 kobject_put(&swnode->kobj);
1163 }
1164}
1165
1166static int __init software_node_init(void)
1167{
1168 swnode_kset = kset_create_and_add("software_nodes", NULL, kernel_kobj);
1169 if (!swnode_kset)
1170 return -ENOMEM;
1171 return 0;
1172}
1173postcore_initcall(software_node_init);
1174
1175static void __exit software_node_exit(void)
1176{
1177 ida_destroy(&swnode_root_ids);
1178 kset_unregister(swnode_kset);
1179}
1180__exitcall(software_node_exit);
1181