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14#include <linux/kernel.h>
15#include <linux/export.h>
16#include <linux/module.h>
17#include <linux/err.h>
18#include <linux/device.h>
19#include <linux/slab.h>
20#include <linux/of.h>
21#include <linux/phy/phy.h>
22#include <linux/idr.h>
23#include <linux/pm_runtime.h>
24#include <linux/regulator/consumer.h>
25
26static struct class *phy_class;
27static DEFINE_MUTEX(phy_provider_mutex);
28static LIST_HEAD(phy_provider_list);
29static LIST_HEAD(phys);
30static DEFINE_IDA(phy_ida);
31
32static void devm_phy_release(struct device *dev, void *res)
33{
34 struct phy *phy = *(struct phy **)res;
35
36 phy_put(phy);
37}
38
39static void devm_phy_provider_release(struct device *dev, void *res)
40{
41 struct phy_provider *phy_provider = *(struct phy_provider **)res;
42
43 of_phy_provider_unregister(phy_provider);
44}
45
46static void devm_phy_consume(struct device *dev, void *res)
47{
48 struct phy *phy = *(struct phy **)res;
49
50 phy_destroy(phy);
51}
52
53static int devm_phy_match(struct device *dev, void *res, void *match_data)
54{
55 struct phy **phy = res;
56
57 return *phy == match_data;
58}
59
60
61
62
63
64
65
66
67
68int phy_create_lookup(struct phy *phy, const char *con_id, const char *dev_id)
69{
70 struct phy_lookup *pl;
71
72 if (!phy || !dev_id || !con_id)
73 return -EINVAL;
74
75 pl = kzalloc(sizeof(*pl), GFP_KERNEL);
76 if (!pl)
77 return -ENOMEM;
78
79 pl->dev_id = dev_id;
80 pl->con_id = con_id;
81 pl->phy = phy;
82
83 mutex_lock(&phy_provider_mutex);
84 list_add_tail(&pl->node, &phys);
85 mutex_unlock(&phy_provider_mutex);
86
87 return 0;
88}
89EXPORT_SYMBOL_GPL(phy_create_lookup);
90
91
92
93
94
95
96
97
98
99
100void phy_remove_lookup(struct phy *phy, const char *con_id, const char *dev_id)
101{
102 struct phy_lookup *pl;
103
104 if (!phy || !dev_id || !con_id)
105 return;
106
107 mutex_lock(&phy_provider_mutex);
108 list_for_each_entry(pl, &phys, node)
109 if (pl->phy == phy && !strcmp(pl->dev_id, dev_id) &&
110 !strcmp(pl->con_id, con_id)) {
111 list_del(&pl->node);
112 kfree(pl);
113 break;
114 }
115 mutex_unlock(&phy_provider_mutex);
116}
117EXPORT_SYMBOL_GPL(phy_remove_lookup);
118
119static struct phy *phy_find(struct device *dev, const char *con_id)
120{
121 const char *dev_id = dev_name(dev);
122 struct phy_lookup *p, *pl = NULL;
123
124 mutex_lock(&phy_provider_mutex);
125 list_for_each_entry(p, &phys, node)
126 if (!strcmp(p->dev_id, dev_id) && !strcmp(p->con_id, con_id)) {
127 pl = p;
128 break;
129 }
130 mutex_unlock(&phy_provider_mutex);
131
132 return pl ? pl->phy : ERR_PTR(-ENODEV);
133}
134
135static struct phy_provider *of_phy_provider_lookup(struct device_node *node)
136{
137 struct phy_provider *phy_provider;
138 struct device_node *child;
139
140 list_for_each_entry(phy_provider, &phy_provider_list, list) {
141 if (phy_provider->dev->of_node == node)
142 return phy_provider;
143
144 for_each_child_of_node(phy_provider->children, child)
145 if (child == node)
146 return phy_provider;
147 }
148
149 return ERR_PTR(-EPROBE_DEFER);
150}
151
152int phy_pm_runtime_get(struct phy *phy)
153{
154 int ret;
155
156 if (!pm_runtime_enabled(&phy->dev))
157 return -ENOTSUPP;
158
159 ret = pm_runtime_get(&phy->dev);
160 if (ret < 0 && ret != -EINPROGRESS)
161 pm_runtime_put_noidle(&phy->dev);
162
163 return ret;
164}
165EXPORT_SYMBOL_GPL(phy_pm_runtime_get);
166
167int phy_pm_runtime_get_sync(struct phy *phy)
168{
169 int ret;
170
171 if (!pm_runtime_enabled(&phy->dev))
172 return -ENOTSUPP;
173
174 ret = pm_runtime_get_sync(&phy->dev);
175 if (ret < 0)
176 pm_runtime_put_sync(&phy->dev);
177
178 return ret;
179}
180EXPORT_SYMBOL_GPL(phy_pm_runtime_get_sync);
181
182int phy_pm_runtime_put(struct phy *phy)
183{
184 if (!pm_runtime_enabled(&phy->dev))
185 return -ENOTSUPP;
186
187 return pm_runtime_put(&phy->dev);
188}
189EXPORT_SYMBOL_GPL(phy_pm_runtime_put);
190
191int phy_pm_runtime_put_sync(struct phy *phy)
192{
193 if (!pm_runtime_enabled(&phy->dev))
194 return -ENOTSUPP;
195
196 return pm_runtime_put_sync(&phy->dev);
197}
198EXPORT_SYMBOL_GPL(phy_pm_runtime_put_sync);
199
200void phy_pm_runtime_allow(struct phy *phy)
201{
202 if (!pm_runtime_enabled(&phy->dev))
203 return;
204
205 pm_runtime_allow(&phy->dev);
206}
207EXPORT_SYMBOL_GPL(phy_pm_runtime_allow);
208
209void phy_pm_runtime_forbid(struct phy *phy)
210{
211 if (!pm_runtime_enabled(&phy->dev))
212 return;
213
214 pm_runtime_forbid(&phy->dev);
215}
216EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid);
217
218int phy_init(struct phy *phy)
219{
220 int ret;
221
222 if (!phy)
223 return 0;
224
225 ret = phy_pm_runtime_get_sync(phy);
226 if (ret < 0 && ret != -ENOTSUPP)
227 return ret;
228 ret = 0;
229
230 mutex_lock(&phy->mutex);
231 if (phy->init_count == 0 && phy->ops->init) {
232 ret = phy->ops->init(phy);
233 if (ret < 0) {
234 dev_err(&phy->dev, "phy init failed --> %d\n", ret);
235 goto out;
236 }
237 }
238 ++phy->init_count;
239
240out:
241 mutex_unlock(&phy->mutex);
242 phy_pm_runtime_put(phy);
243 return ret;
244}
245EXPORT_SYMBOL_GPL(phy_init);
246
247int phy_exit(struct phy *phy)
248{
249 int ret;
250
251 if (!phy)
252 return 0;
253
254 ret = phy_pm_runtime_get_sync(phy);
255 if (ret < 0 && ret != -ENOTSUPP)
256 return ret;
257 ret = 0;
258
259 mutex_lock(&phy->mutex);
260 if (phy->init_count == 1 && phy->ops->exit) {
261 ret = phy->ops->exit(phy);
262 if (ret < 0) {
263 dev_err(&phy->dev, "phy exit failed --> %d\n", ret);
264 goto out;
265 }
266 }
267 --phy->init_count;
268
269out:
270 mutex_unlock(&phy->mutex);
271 phy_pm_runtime_put(phy);
272 return ret;
273}
274EXPORT_SYMBOL_GPL(phy_exit);
275
276int phy_power_on(struct phy *phy)
277{
278 int ret = 0;
279
280 if (!phy)
281 goto out;
282
283 if (phy->pwr) {
284 ret = regulator_enable(phy->pwr);
285 if (ret)
286 goto out;
287 }
288
289 ret = phy_pm_runtime_get_sync(phy);
290 if (ret < 0 && ret != -ENOTSUPP)
291 goto err_pm_sync;
292
293 ret = 0;
294
295 mutex_lock(&phy->mutex);
296 if (phy->power_count == 0 && phy->ops->power_on) {
297 ret = phy->ops->power_on(phy);
298 if (ret < 0) {
299 dev_err(&phy->dev, "phy poweron failed --> %d\n", ret);
300 goto err_pwr_on;
301 }
302 }
303 ++phy->power_count;
304 mutex_unlock(&phy->mutex);
305 return 0;
306
307err_pwr_on:
308 mutex_unlock(&phy->mutex);
309 phy_pm_runtime_put_sync(phy);
310err_pm_sync:
311 if (phy->pwr)
312 regulator_disable(phy->pwr);
313out:
314 return ret;
315}
316EXPORT_SYMBOL_GPL(phy_power_on);
317
318int phy_power_off(struct phy *phy)
319{
320 int ret;
321
322 if (!phy)
323 return 0;
324
325 mutex_lock(&phy->mutex);
326 if (phy->power_count == 1 && phy->ops->power_off) {
327 ret = phy->ops->power_off(phy);
328 if (ret < 0) {
329 dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret);
330 mutex_unlock(&phy->mutex);
331 return ret;
332 }
333 }
334 --phy->power_count;
335 mutex_unlock(&phy->mutex);
336 phy_pm_runtime_put(phy);
337
338 if (phy->pwr)
339 regulator_disable(phy->pwr);
340
341 return 0;
342}
343EXPORT_SYMBOL_GPL(phy_power_off);
344
345int phy_set_mode(struct phy *phy, enum phy_mode mode)
346{
347 int ret;
348
349 if (!phy || !phy->ops->set_mode)
350 return 0;
351
352 mutex_lock(&phy->mutex);
353 ret = phy->ops->set_mode(phy, mode);
354 mutex_unlock(&phy->mutex);
355
356 return ret;
357}
358EXPORT_SYMBOL_GPL(phy_set_mode);
359
360int phy_reset(struct phy *phy)
361{
362 int ret;
363
364 if (!phy || !phy->ops->reset)
365 return 0;
366
367 mutex_lock(&phy->mutex);
368 ret = phy->ops->reset(phy);
369 mutex_unlock(&phy->mutex);
370
371 return ret;
372}
373EXPORT_SYMBOL_GPL(phy_reset);
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383
384
385
386static struct phy *_of_phy_get(struct device_node *np, int index)
387{
388 int ret;
389 struct phy_provider *phy_provider;
390 struct phy *phy = NULL;
391 struct of_phandle_args args;
392
393 ret = of_parse_phandle_with_args(np, "phys", "#phy-cells",
394 index, &args);
395 if (ret)
396 return ERR_PTR(-ENODEV);
397
398 mutex_lock(&phy_provider_mutex);
399 phy_provider = of_phy_provider_lookup(args.np);
400 if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
401 phy = ERR_PTR(-EPROBE_DEFER);
402 goto out_unlock;
403 }
404
405 if (!of_device_is_available(args.np)) {
406 dev_warn(phy_provider->dev, "Requested PHY is disabled\n");
407 phy = ERR_PTR(-ENODEV);
408 goto out_put_module;
409 }
410
411 phy = phy_provider->of_xlate(phy_provider->dev, &args);
412
413out_put_module:
414 module_put(phy_provider->owner);
415
416out_unlock:
417 mutex_unlock(&phy_provider_mutex);
418 of_node_put(args.np);
419
420 return phy;
421}
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424
425
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427
428
429
430
431
432struct phy *of_phy_get(struct device_node *np, const char *con_id)
433{
434 struct phy *phy = NULL;
435 int index = 0;
436
437 if (con_id)
438 index = of_property_match_string(np, "phy-names", con_id);
439
440 phy = _of_phy_get(np, index);
441 if (IS_ERR(phy))
442 return phy;
443
444 if (!try_module_get(phy->ops->owner))
445 return ERR_PTR(-EPROBE_DEFER);
446
447 get_device(&phy->dev);
448
449 return phy;
450}
451EXPORT_SYMBOL_GPL(of_phy_get);
452
453
454
455
456
457
458
459void phy_put(struct phy *phy)
460{
461 if (!phy || IS_ERR(phy))
462 return;
463
464 module_put(phy->ops->owner);
465 put_device(&phy->dev);
466}
467EXPORT_SYMBOL_GPL(phy_put);
468
469
470
471
472
473
474
475
476
477void devm_phy_put(struct device *dev, struct phy *phy)
478{
479 int r;
480
481 if (!phy)
482 return;
483
484 r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
485 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
486}
487EXPORT_SYMBOL_GPL(devm_phy_put);
488
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490
491
492
493
494
495
496
497
498
499struct phy *of_phy_simple_xlate(struct device *dev, struct of_phandle_args
500 *args)
501{
502 struct phy *phy;
503 struct class_dev_iter iter;
504
505 class_dev_iter_init(&iter, phy_class, NULL, NULL);
506 while ((dev = class_dev_iter_next(&iter))) {
507 phy = to_phy(dev);
508 if (args->np != phy->dev.of_node)
509 continue;
510
511 class_dev_iter_exit(&iter);
512 return phy;
513 }
514
515 class_dev_iter_exit(&iter);
516 return ERR_PTR(-ENODEV);
517}
518EXPORT_SYMBOL_GPL(of_phy_simple_xlate);
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528
529
530struct phy *phy_get(struct device *dev, const char *string)
531{
532 int index = 0;
533 struct phy *phy;
534
535 if (string == NULL) {
536 dev_WARN(dev, "missing string\n");
537 return ERR_PTR(-EINVAL);
538 }
539
540 if (dev->of_node) {
541 index = of_property_match_string(dev->of_node, "phy-names",
542 string);
543 phy = _of_phy_get(dev->of_node, index);
544 } else {
545 phy = phy_find(dev, string);
546 }
547 if (IS_ERR(phy))
548 return phy;
549
550 if (!try_module_get(phy->ops->owner))
551 return ERR_PTR(-EPROBE_DEFER);
552
553 get_device(&phy->dev);
554
555 return phy;
556}
557EXPORT_SYMBOL_GPL(phy_get);
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568
569struct phy *phy_optional_get(struct device *dev, const char *string)
570{
571 struct phy *phy = phy_get(dev, string);
572
573 if (IS_ERR(phy) && (PTR_ERR(phy) == -ENODEV))
574 phy = NULL;
575
576 return phy;
577}
578EXPORT_SYMBOL_GPL(phy_optional_get);
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589
590struct phy *devm_phy_get(struct device *dev, const char *string)
591{
592 struct phy **ptr, *phy;
593
594 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
595 if (!ptr)
596 return ERR_PTR(-ENOMEM);
597
598 phy = phy_get(dev, string);
599 if (!IS_ERR(phy)) {
600 *ptr = phy;
601 devres_add(dev, ptr);
602 } else {
603 devres_free(ptr);
604 }
605
606 return phy;
607}
608EXPORT_SYMBOL_GPL(devm_phy_get);
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621
622
623struct phy *devm_phy_optional_get(struct device *dev, const char *string)
624{
625 struct phy *phy = devm_phy_get(dev, string);
626
627 if (IS_ERR(phy) && (PTR_ERR(phy) == -ENODEV))
628 phy = NULL;
629
630 return phy;
631}
632EXPORT_SYMBOL_GPL(devm_phy_optional_get);
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642
643
644struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
645 const char *con_id)
646{
647 struct phy **ptr, *phy;
648
649 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
650 if (!ptr)
651 return ERR_PTR(-ENOMEM);
652
653 phy = of_phy_get(np, con_id);
654 if (!IS_ERR(phy)) {
655 *ptr = phy;
656 devres_add(dev, ptr);
657 } else {
658 devres_free(ptr);
659 }
660
661 return phy;
662}
663EXPORT_SYMBOL_GPL(devm_of_phy_get);
664
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676
677struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
678 int index)
679{
680 struct phy **ptr, *phy;
681
682 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
683 if (!ptr)
684 return ERR_PTR(-ENOMEM);
685
686 phy = _of_phy_get(np, index);
687 if (IS_ERR(phy)) {
688 devres_free(ptr);
689 return phy;
690 }
691
692 if (!try_module_get(phy->ops->owner)) {
693 devres_free(ptr);
694 return ERR_PTR(-EPROBE_DEFER);
695 }
696
697 get_device(&phy->dev);
698
699 *ptr = phy;
700 devres_add(dev, ptr);
701
702 return phy;
703}
704EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index);
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712
713
714struct phy *phy_create(struct device *dev, struct device_node *node,
715 const struct phy_ops *ops)
716{
717 int ret;
718 int id;
719 struct phy *phy;
720
721 if (WARN_ON(!dev))
722 return ERR_PTR(-EINVAL);
723
724 phy = kzalloc(sizeof(*phy), GFP_KERNEL);
725 if (!phy)
726 return ERR_PTR(-ENOMEM);
727
728 id = ida_simple_get(&phy_ida, 0, 0, GFP_KERNEL);
729 if (id < 0) {
730 dev_err(dev, "unable to get id\n");
731 ret = id;
732 goto free_phy;
733 }
734
735 device_initialize(&phy->dev);
736 mutex_init(&phy->mutex);
737
738 phy->dev.class = phy_class;
739 phy->dev.parent = dev;
740 phy->dev.of_node = node ?: dev->of_node;
741 phy->id = id;
742 phy->ops = ops;
743
744 ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id);
745 if (ret)
746 goto put_dev;
747
748
749 phy->pwr = regulator_get_optional(&phy->dev, "phy");
750 if (IS_ERR(phy->pwr)) {
751 ret = PTR_ERR(phy->pwr);
752 if (ret == -EPROBE_DEFER)
753 goto put_dev;
754
755 phy->pwr = NULL;
756 }
757
758 ret = device_add(&phy->dev);
759 if (ret)
760 goto put_dev;
761
762 if (pm_runtime_enabled(dev)) {
763 pm_runtime_enable(&phy->dev);
764 pm_runtime_no_callbacks(&phy->dev);
765 }
766
767 return phy;
768
769put_dev:
770 put_device(&phy->dev);
771 return ERR_PTR(ret);
772
773free_phy:
774 kfree(phy);
775 return ERR_PTR(ret);
776}
777EXPORT_SYMBOL_GPL(phy_create);
778
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784
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786
787
788
789
790struct phy *devm_phy_create(struct device *dev, struct device_node *node,
791 const struct phy_ops *ops)
792{
793 struct phy **ptr, *phy;
794
795 ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL);
796 if (!ptr)
797 return ERR_PTR(-ENOMEM);
798
799 phy = phy_create(dev, node, ops);
800 if (!IS_ERR(phy)) {
801 *ptr = phy;
802 devres_add(dev, ptr);
803 } else {
804 devres_free(ptr);
805 }
806
807 return phy;
808}
809EXPORT_SYMBOL_GPL(devm_phy_create);
810
811
812
813
814
815
816
817void phy_destroy(struct phy *phy)
818{
819 pm_runtime_disable(&phy->dev);
820 device_unregister(&phy->dev);
821}
822EXPORT_SYMBOL_GPL(phy_destroy);
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824
825
826
827
828
829
830
831
832void devm_phy_destroy(struct device *dev, struct phy *phy)
833{
834 int r;
835
836 r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy);
837 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
838}
839EXPORT_SYMBOL_GPL(devm_phy_destroy);
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859struct phy_provider *__of_phy_provider_register(struct device *dev,
860 struct device_node *children, struct module *owner,
861 struct phy * (*of_xlate)(struct device *dev,
862 struct of_phandle_args *args))
863{
864 struct phy_provider *phy_provider;
865
866
867
868
869
870
871 if (children) {
872 struct device_node *parent = of_node_get(children), *next;
873
874 while (parent) {
875 if (parent == dev->of_node)
876 break;
877
878 next = of_get_parent(parent);
879 of_node_put(parent);
880 parent = next;
881 }
882
883 if (!parent)
884 return ERR_PTR(-EINVAL);
885
886 of_node_put(parent);
887 } else {
888 children = dev->of_node;
889 }
890
891 phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
892 if (!phy_provider)
893 return ERR_PTR(-ENOMEM);
894
895 phy_provider->dev = dev;
896 phy_provider->children = of_node_get(children);
897 phy_provider->owner = owner;
898 phy_provider->of_xlate = of_xlate;
899
900 mutex_lock(&phy_provider_mutex);
901 list_add_tail(&phy_provider->list, &phy_provider_list);
902 mutex_unlock(&phy_provider_mutex);
903
904 return phy_provider;
905}
906EXPORT_SYMBOL_GPL(__of_phy_provider_register);
907
908
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913
914
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916
917
918
919
920
921struct phy_provider *__devm_of_phy_provider_register(struct device *dev,
922 struct device_node *children, struct module *owner,
923 struct phy * (*of_xlate)(struct device *dev,
924 struct of_phandle_args *args))
925{
926 struct phy_provider **ptr, *phy_provider;
927
928 ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL);
929 if (!ptr)
930 return ERR_PTR(-ENOMEM);
931
932 phy_provider = __of_phy_provider_register(dev, children, owner,
933 of_xlate);
934 if (!IS_ERR(phy_provider)) {
935 *ptr = phy_provider;
936 devres_add(dev, ptr);
937 } else {
938 devres_free(ptr);
939 }
940
941 return phy_provider;
942}
943EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register);
944
945
946
947
948
949
950
951void of_phy_provider_unregister(struct phy_provider *phy_provider)
952{
953 if (IS_ERR(phy_provider))
954 return;
955
956 mutex_lock(&phy_provider_mutex);
957 list_del(&phy_provider->list);
958 of_node_put(phy_provider->children);
959 kfree(phy_provider);
960 mutex_unlock(&phy_provider_mutex);
961}
962EXPORT_SYMBOL_GPL(of_phy_provider_unregister);
963
964
965
966
967
968
969
970
971void devm_of_phy_provider_unregister(struct device *dev,
972 struct phy_provider *phy_provider) {
973 int r;
974
975 r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match,
976 phy_provider);
977 dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n");
978}
979EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
980
981
982
983
984
985
986
987
988static void phy_release(struct device *dev)
989{
990 struct phy *phy;
991
992 phy = to_phy(dev);
993 dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
994 regulator_put(phy->pwr);
995 ida_simple_remove(&phy_ida, phy->id);
996 kfree(phy);
997}
998
999static int __init phy_core_init(void)
1000{
1001 phy_class = class_create(THIS_MODULE, "phy");
1002 if (IS_ERR(phy_class)) {
1003 pr_err("failed to create phy class --> %ld\n",
1004 PTR_ERR(phy_class));
1005 return PTR_ERR(phy_class);
1006 }
1007
1008 phy_class->dev_release = phy_release;
1009
1010 return 0;
1011}
1012module_init(phy_core_init);
1013
1014static void __exit phy_core_exit(void)
1015{
1016 class_destroy(phy_class);
1017}
1018module_exit(phy_core_exit);
1019
1020MODULE_DESCRIPTION("Generic PHY Framework");
1021MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
1022MODULE_LICENSE("GPL v2");
1023