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22#include <linux/module.h>
23#include <linux/pwm.h>
24#include <linux/radix-tree.h>
25#include <linux/list.h>
26#include <linux/mutex.h>
27#include <linux/err.h>
28#include <linux/slab.h>
29#include <linux/device.h>
30#include <linux/debugfs.h>
31#include <linux/seq_file.h>
32
33#include <dt-bindings/pwm/pwm.h>
34
35#define MAX_PWMS 1024
36
37static DEFINE_MUTEX(pwm_lookup_lock);
38static LIST_HEAD(pwm_lookup_list);
39static DEFINE_MUTEX(pwm_lock);
40static LIST_HEAD(pwm_chips);
41static DECLARE_BITMAP(allocated_pwms, MAX_PWMS);
42static RADIX_TREE(pwm_tree, GFP_KERNEL);
43
44static struct pwm_device *pwm_to_device(unsigned int pwm)
45{
46 return radix_tree_lookup(&pwm_tree, pwm);
47}
48
49static int alloc_pwms(int pwm, unsigned int count)
50{
51 unsigned int from = 0;
52 unsigned int start;
53
54 if (pwm >= MAX_PWMS)
55 return -EINVAL;
56
57 if (pwm >= 0)
58 from = pwm;
59
60 start = bitmap_find_next_zero_area(allocated_pwms, MAX_PWMS, from,
61 count, 0);
62
63 if (pwm >= 0 && start != pwm)
64 return -EEXIST;
65
66 if (start + count > MAX_PWMS)
67 return -ENOSPC;
68
69 return start;
70}
71
72static void free_pwms(struct pwm_chip *chip)
73{
74 unsigned int i;
75
76 for (i = 0; i < chip->npwm; i++) {
77 struct pwm_device *pwm = &chip->pwms[i];
78
79 radix_tree_delete(&pwm_tree, pwm->pwm);
80 }
81
82 bitmap_clear(allocated_pwms, chip->base, chip->npwm);
83
84 kfree(chip->pwms);
85 chip->pwms = NULL;
86}
87
88static struct pwm_chip *pwmchip_find_by_name(const char *name)
89{
90 struct pwm_chip *chip;
91
92 if (!name)
93 return NULL;
94
95 mutex_lock(&pwm_lock);
96
97 list_for_each_entry(chip, &pwm_chips, list) {
98 const char *chip_name = dev_name(chip->dev);
99
100 if (chip_name && strcmp(chip_name, name) == 0) {
101 mutex_unlock(&pwm_lock);
102 return chip;
103 }
104 }
105
106 mutex_unlock(&pwm_lock);
107
108 return NULL;
109}
110
111static int pwm_device_request(struct pwm_device *pwm, const char *label)
112{
113 int err;
114
115 if (test_bit(PWMF_REQUESTED, &pwm->flags))
116 return -EBUSY;
117
118 if (!try_module_get(pwm->chip->ops->owner))
119 return -ENODEV;
120
121 if (pwm->chip->ops->request) {
122 err = pwm->chip->ops->request(pwm->chip, pwm);
123 if (err) {
124 module_put(pwm->chip->ops->owner);
125 return err;
126 }
127 }
128
129 set_bit(PWMF_REQUESTED, &pwm->flags);
130 pwm->label = label;
131
132 return 0;
133}
134
135struct pwm_device *
136of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args)
137{
138 struct pwm_device *pwm;
139
140 if (pc->of_pwm_n_cells < 3)
141 return ERR_PTR(-EINVAL);
142
143 if (args->args[0] >= pc->npwm)
144 return ERR_PTR(-EINVAL);
145
146 pwm = pwm_request_from_chip(pc, args->args[0], NULL);
147 if (IS_ERR(pwm))
148 return pwm;
149
150 pwm->args.period = args->args[1];
151
152 if (args->args[2] & PWM_POLARITY_INVERTED)
153 pwm->args.polarity = PWM_POLARITY_INVERSED;
154 else
155 pwm->args.polarity = PWM_POLARITY_NORMAL;
156
157 return pwm;
158}
159EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags);
160
161static struct pwm_device *
162of_pwm_simple_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
163{
164 struct pwm_device *pwm;
165
166 if (pc->of_pwm_n_cells < 2)
167 return ERR_PTR(-EINVAL);
168
169 if (args->args[0] >= pc->npwm)
170 return ERR_PTR(-EINVAL);
171
172 pwm = pwm_request_from_chip(pc, args->args[0], NULL);
173 if (IS_ERR(pwm))
174 return pwm;
175
176 pwm->args.period = args->args[1];
177
178 return pwm;
179}
180
181static void of_pwmchip_add(struct pwm_chip *chip)
182{
183 if (!chip->dev || !chip->dev->of_node)
184 return;
185
186 if (!chip->of_xlate) {
187 chip->of_xlate = of_pwm_simple_xlate;
188 chip->of_pwm_n_cells = 2;
189 }
190
191 of_node_get(chip->dev->of_node);
192}
193
194static void of_pwmchip_remove(struct pwm_chip *chip)
195{
196 if (chip->dev)
197 of_node_put(chip->dev->of_node);
198}
199
200
201
202
203
204
205
206
207int pwm_set_chip_data(struct pwm_device *pwm, void *data)
208{
209 if (!pwm)
210 return -EINVAL;
211
212 pwm->chip_data = data;
213
214 return 0;
215}
216EXPORT_SYMBOL_GPL(pwm_set_chip_data);
217
218
219
220
221
222
223
224void *pwm_get_chip_data(struct pwm_device *pwm)
225{
226 return pwm ? pwm->chip_data : NULL;
227}
228EXPORT_SYMBOL_GPL(pwm_get_chip_data);
229
230static bool pwm_ops_check(const struct pwm_ops *ops)
231{
232
233 if (ops->config && ops->enable && ops->disable)
234 return true;
235
236
237 if (ops->apply)
238 return true;
239
240 return false;
241}
242
243
244
245
246
247
248
249
250
251
252
253
254int pwmchip_add_with_polarity(struct pwm_chip *chip,
255 enum pwm_polarity polarity)
256{
257 struct pwm_device *pwm;
258 unsigned int i;
259 int ret;
260
261 if (!chip || !chip->dev || !chip->ops || !chip->npwm)
262 return -EINVAL;
263
264 if (!pwm_ops_check(chip->ops))
265 return -EINVAL;
266
267 mutex_lock(&pwm_lock);
268
269 ret = alloc_pwms(chip->base, chip->npwm);
270 if (ret < 0)
271 goto out;
272
273 chip->pwms = kcalloc(chip->npwm, sizeof(*pwm), GFP_KERNEL);
274 if (!chip->pwms) {
275 ret = -ENOMEM;
276 goto out;
277 }
278
279 chip->base = ret;
280
281 for (i = 0; i < chip->npwm; i++) {
282 pwm = &chip->pwms[i];
283
284 pwm->chip = chip;
285 pwm->pwm = chip->base + i;
286 pwm->hwpwm = i;
287 pwm->state.polarity = polarity;
288
289 if (chip->ops->get_state)
290 chip->ops->get_state(chip, pwm, &pwm->state);
291
292 radix_tree_insert(&pwm_tree, pwm->pwm, pwm);
293 }
294
295 bitmap_set(allocated_pwms, chip->base, chip->npwm);
296
297 INIT_LIST_HEAD(&chip->list);
298 list_add(&chip->list, &pwm_chips);
299
300 ret = 0;
301
302 if (IS_ENABLED(CONFIG_OF))
303 of_pwmchip_add(chip);
304
305 pwmchip_sysfs_export(chip);
306
307out:
308 mutex_unlock(&pwm_lock);
309 return ret;
310}
311EXPORT_SYMBOL_GPL(pwmchip_add_with_polarity);
312
313
314
315
316
317
318
319
320
321
322int pwmchip_add(struct pwm_chip *chip)
323{
324 return pwmchip_add_with_polarity(chip, PWM_POLARITY_NORMAL);
325}
326EXPORT_SYMBOL_GPL(pwmchip_add);
327
328
329
330
331
332
333
334
335
336
337int pwmchip_remove(struct pwm_chip *chip)
338{
339 unsigned int i;
340 int ret = 0;
341
342 mutex_lock(&pwm_lock);
343
344 for (i = 0; i < chip->npwm; i++) {
345 struct pwm_device *pwm = &chip->pwms[i];
346
347 if (test_bit(PWMF_REQUESTED, &pwm->flags)) {
348 ret = -EBUSY;
349 goto out;
350 }
351 }
352
353 list_del_init(&chip->list);
354
355 if (IS_ENABLED(CONFIG_OF))
356 of_pwmchip_remove(chip);
357
358 free_pwms(chip);
359
360 pwmchip_sysfs_unexport(chip);
361
362out:
363 mutex_unlock(&pwm_lock);
364 return ret;
365}
366EXPORT_SYMBOL_GPL(pwmchip_remove);
367
368
369
370
371
372
373
374
375
376
377
378struct pwm_device *pwm_request(int pwm, const char *label)
379{
380 struct pwm_device *dev;
381 int err;
382
383 if (pwm < 0 || pwm >= MAX_PWMS)
384 return ERR_PTR(-EINVAL);
385
386 mutex_lock(&pwm_lock);
387
388 dev = pwm_to_device(pwm);
389 if (!dev) {
390 dev = ERR_PTR(-EPROBE_DEFER);
391 goto out;
392 }
393
394 err = pwm_device_request(dev, label);
395 if (err < 0)
396 dev = ERR_PTR(err);
397
398out:
399 mutex_unlock(&pwm_lock);
400
401 return dev;
402}
403EXPORT_SYMBOL_GPL(pwm_request);
404
405
406
407
408
409
410
411
412
413
414
415struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
416 unsigned int index,
417 const char *label)
418{
419 struct pwm_device *pwm;
420 int err;
421
422 if (!chip || index >= chip->npwm)
423 return ERR_PTR(-EINVAL);
424
425 mutex_lock(&pwm_lock);
426 pwm = &chip->pwms[index];
427
428 err = pwm_device_request(pwm, label);
429 if (err < 0)
430 pwm = ERR_PTR(err);
431
432 mutex_unlock(&pwm_lock);
433 return pwm;
434}
435EXPORT_SYMBOL_GPL(pwm_request_from_chip);
436
437
438
439
440
441
442
443void pwm_free(struct pwm_device *pwm)
444{
445 pwm_put(pwm);
446}
447EXPORT_SYMBOL_GPL(pwm_free);
448
449
450
451
452
453
454
455
456int pwm_apply_state(struct pwm_device *pwm, struct pwm_state *state)
457{
458 int err;
459
460 if (!pwm || !state || !state->period ||
461 state->duty_cycle > state->period)
462 return -EINVAL;
463
464 if (!memcmp(state, &pwm->state, sizeof(*state)))
465 return 0;
466
467 if (pwm->chip->ops->apply) {
468 err = pwm->chip->ops->apply(pwm->chip, pwm, state);
469 if (err)
470 return err;
471
472 pwm->state = *state;
473 } else {
474
475
476
477 if (state->polarity != pwm->state.polarity) {
478 if (!pwm->chip->ops->set_polarity)
479 return -ENOTSUPP;
480
481
482
483
484
485
486 if (pwm->state.enabled) {
487 pwm->chip->ops->disable(pwm->chip, pwm);
488 pwm->state.enabled = false;
489 }
490
491 err = pwm->chip->ops->set_polarity(pwm->chip, pwm,
492 state->polarity);
493 if (err)
494 return err;
495
496 pwm->state.polarity = state->polarity;
497 }
498
499 if (state->period != pwm->state.period ||
500 state->duty_cycle != pwm->state.duty_cycle) {
501 err = pwm->chip->ops->config(pwm->chip, pwm,
502 state->duty_cycle,
503 state->period);
504 if (err)
505 return err;
506
507 pwm->state.duty_cycle = state->duty_cycle;
508 pwm->state.period = state->period;
509 }
510
511 if (state->enabled != pwm->state.enabled) {
512 if (state->enabled) {
513 err = pwm->chip->ops->enable(pwm->chip, pwm);
514 if (err)
515 return err;
516 } else {
517 pwm->chip->ops->disable(pwm->chip, pwm);
518 }
519
520 pwm->state.enabled = state->enabled;
521 }
522 }
523
524 return 0;
525}
526EXPORT_SYMBOL_GPL(pwm_apply_state);
527
528
529
530
531
532
533
534
535
536int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result,
537 unsigned long timeout)
538{
539 int err;
540
541 if (!pwm || !pwm->chip->ops)
542 return -EINVAL;
543
544 if (!pwm->chip->ops->capture)
545 return -ENOSYS;
546
547 mutex_lock(&pwm_lock);
548 err = pwm->chip->ops->capture(pwm->chip, pwm, result, timeout);
549 mutex_unlock(&pwm_lock);
550
551 return err;
552}
553EXPORT_SYMBOL_GPL(pwm_capture);
554
555
556
557
558
559
560
561
562
563int pwm_adjust_config(struct pwm_device *pwm)
564{
565 struct pwm_state state;
566 struct pwm_args pargs;
567
568 pwm_get_args(pwm, &pargs);
569 pwm_get_state(pwm, &state);
570
571
572
573
574
575
576
577
578
579 if (!state.period) {
580 state.duty_cycle = 0;
581 state.period = pargs.period;
582 state.polarity = pargs.polarity;
583
584 return pwm_apply_state(pwm, &state);
585 }
586
587
588
589
590
591 if (pargs.period != state.period) {
592 u64 dutycycle = (u64)state.duty_cycle * pargs.period;
593
594 do_div(dutycycle, state.period);
595 state.duty_cycle = dutycycle;
596 state.period = pargs.period;
597 }
598
599
600
601
602 if (pargs.polarity != state.polarity) {
603 state.polarity = pargs.polarity;
604 state.duty_cycle = state.period - state.duty_cycle;
605 }
606
607 return pwm_apply_state(pwm, &state);
608}
609EXPORT_SYMBOL_GPL(pwm_adjust_config);
610
611static struct pwm_chip *of_node_to_pwmchip(struct device_node *np)
612{
613 struct pwm_chip *chip;
614
615 mutex_lock(&pwm_lock);
616
617 list_for_each_entry(chip, &pwm_chips, list)
618 if (chip->dev && chip->dev->of_node == np) {
619 mutex_unlock(&pwm_lock);
620 return chip;
621 }
622
623 mutex_unlock(&pwm_lock);
624
625 return ERR_PTR(-EPROBE_DEFER);
626}
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id)
648{
649 struct pwm_device *pwm = NULL;
650 struct of_phandle_args args;
651 struct pwm_chip *pc;
652 int index = 0;
653 int err;
654
655 if (con_id) {
656 index = of_property_match_string(np, "pwm-names", con_id);
657 if (index < 0)
658 return ERR_PTR(index);
659 }
660
661 err = of_parse_phandle_with_args(np, "pwms", "#pwm-cells", index,
662 &args);
663 if (err) {
664 pr_debug("%s(): can't parse \"pwms\" property\n", __func__);
665 return ERR_PTR(err);
666 }
667
668 pc = of_node_to_pwmchip(args.np);
669 if (IS_ERR(pc)) {
670 pr_debug("%s(): PWM chip not found\n", __func__);
671 pwm = ERR_CAST(pc);
672 goto put;
673 }
674
675 if (args.args_count != pc->of_pwm_n_cells) {
676 pr_debug("%s: wrong #pwm-cells for %s\n", np->full_name,
677 args.np->full_name);
678 pwm = ERR_PTR(-EINVAL);
679 goto put;
680 }
681
682 pwm = pc->of_xlate(pc, &args);
683 if (IS_ERR(pwm))
684 goto put;
685
686
687
688
689
690
691 if (!con_id) {
692 err = of_property_read_string_index(np, "pwm-names", index,
693 &con_id);
694 if (err < 0)
695 con_id = np->name;
696 }
697
698 pwm->label = con_id;
699
700put:
701 of_node_put(args.np);
702
703 return pwm;
704}
705EXPORT_SYMBOL_GPL(of_pwm_get);
706
707
708
709
710
711
712void pwm_add_table(struct pwm_lookup *table, size_t num)
713{
714 mutex_lock(&pwm_lookup_lock);
715
716 while (num--) {
717 list_add_tail(&table->list, &pwm_lookup_list);
718 table++;
719 }
720
721 mutex_unlock(&pwm_lookup_lock);
722}
723
724
725
726
727
728
729void pwm_remove_table(struct pwm_lookup *table, size_t num)
730{
731 mutex_lock(&pwm_lookup_lock);
732
733 while (num--) {
734 list_del(&table->list);
735 table++;
736 }
737
738 mutex_unlock(&pwm_lookup_lock);
739}
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756struct pwm_device *pwm_get(struct device *dev, const char *con_id)
757{
758 struct pwm_device *pwm = ERR_PTR(-EPROBE_DEFER);
759 const char *dev_id = dev ? dev_name(dev) : NULL;
760 struct pwm_chip *chip = NULL;
761 unsigned int best = 0;
762 struct pwm_lookup *p, *chosen = NULL;
763 unsigned int match;
764
765
766 if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node)
767 return of_pwm_get(dev->of_node, con_id);
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789 mutex_lock(&pwm_lookup_lock);
790
791 list_for_each_entry(p, &pwm_lookup_list, list) {
792 match = 0;
793
794 if (p->dev_id) {
795 if (!dev_id || strcmp(p->dev_id, dev_id))
796 continue;
797
798 match += 2;
799 }
800
801 if (p->con_id) {
802 if (!con_id || strcmp(p->con_id, con_id))
803 continue;
804
805 match += 1;
806 }
807
808 if (match > best) {
809 chosen = p;
810
811 if (match != 3)
812 best = match;
813 else
814 break;
815 }
816 }
817
818 if (!chosen) {
819 pwm = ERR_PTR(-ENODEV);
820 goto out;
821 }
822
823 chip = pwmchip_find_by_name(chosen->provider);
824 if (!chip)
825 goto out;
826
827 pwm = pwm_request_from_chip(chip, chosen->index, con_id ?: dev_id);
828 if (IS_ERR(pwm))
829 goto out;
830
831 pwm->args.period = chosen->period;
832 pwm->args.polarity = chosen->polarity;
833
834out:
835 mutex_unlock(&pwm_lookup_lock);
836 return pwm;
837}
838EXPORT_SYMBOL_GPL(pwm_get);
839
840
841
842
843
844void pwm_put(struct pwm_device *pwm)
845{
846 if (!pwm)
847 return;
848
849 mutex_lock(&pwm_lock);
850
851 if (!test_and_clear_bit(PWMF_REQUESTED, &pwm->flags)) {
852 pr_warn("PWM device already freed\n");
853 goto out;
854 }
855
856 if (pwm->chip->ops->free)
857 pwm->chip->ops->free(pwm->chip, pwm);
858
859 pwm->label = NULL;
860
861 module_put(pwm->chip->ops->owner);
862out:
863 mutex_unlock(&pwm_lock);
864}
865EXPORT_SYMBOL_GPL(pwm_put);
866
867static void devm_pwm_release(struct device *dev, void *res)
868{
869 pwm_put(*(struct pwm_device **)res);
870}
871
872
873
874
875
876
877
878
879
880
881
882
883struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id)
884{
885 struct pwm_device **ptr, *pwm;
886
887 ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
888 if (!ptr)
889 return ERR_PTR(-ENOMEM);
890
891 pwm = pwm_get(dev, con_id);
892 if (!IS_ERR(pwm)) {
893 *ptr = pwm;
894 devres_add(dev, ptr);
895 } else {
896 devres_free(ptr);
897 }
898
899 return pwm;
900}
901EXPORT_SYMBOL_GPL(devm_pwm_get);
902
903
904
905
906
907
908
909
910
911
912
913
914
915struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
916 const char *con_id)
917{
918 struct pwm_device **ptr, *pwm;
919
920 ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
921 if (!ptr)
922 return ERR_PTR(-ENOMEM);
923
924 pwm = of_pwm_get(np, con_id);
925 if (!IS_ERR(pwm)) {
926 *ptr = pwm;
927 devres_add(dev, ptr);
928 } else {
929 devres_free(ptr);
930 }
931
932 return pwm;
933}
934EXPORT_SYMBOL_GPL(devm_of_pwm_get);
935
936static int devm_pwm_match(struct device *dev, void *res, void *data)
937{
938 struct pwm_device **p = res;
939
940 if (WARN_ON(!p || !*p))
941 return 0;
942
943 return *p == data;
944}
945
946
947
948
949
950
951
952
953
954
955void devm_pwm_put(struct device *dev, struct pwm_device *pwm)
956{
957 WARN_ON(devres_release(dev, devm_pwm_release, devm_pwm_match, pwm));
958}
959EXPORT_SYMBOL_GPL(devm_pwm_put);
960
961
962
963
964
965
966
967bool pwm_can_sleep(struct pwm_device *pwm)
968{
969 return true;
970}
971EXPORT_SYMBOL_GPL(pwm_can_sleep);
972
973#ifdef CONFIG_DEBUG_FS
974static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s)
975{
976 unsigned int i;
977
978 for (i = 0; i < chip->npwm; i++) {
979 struct pwm_device *pwm = &chip->pwms[i];
980 struct pwm_state state;
981
982 pwm_get_state(pwm, &state);
983
984 seq_printf(s, " pwm-%-3d (%-20.20s):", i, pwm->label);
985
986 if (test_bit(PWMF_REQUESTED, &pwm->flags))
987 seq_puts(s, " requested");
988
989 if (state.enabled)
990 seq_puts(s, " enabled");
991
992 seq_printf(s, " period: %u ns", state.period);
993 seq_printf(s, " duty: %u ns", state.duty_cycle);
994 seq_printf(s, " polarity: %s",
995 state.polarity ? "inverse" : "normal");
996
997 seq_puts(s, "\n");
998 }
999}
1000
1001static void *pwm_seq_start(struct seq_file *s, loff_t *pos)
1002{
1003 mutex_lock(&pwm_lock);
1004 s->private = "";
1005
1006 return seq_list_start(&pwm_chips, *pos);
1007}
1008
1009static void *pwm_seq_next(struct seq_file *s, void *v, loff_t *pos)
1010{
1011 s->private = "\n";
1012
1013 return seq_list_next(v, &pwm_chips, pos);
1014}
1015
1016static void pwm_seq_stop(struct seq_file *s, void *v)
1017{
1018 mutex_unlock(&pwm_lock);
1019}
1020
1021static int pwm_seq_show(struct seq_file *s, void *v)
1022{
1023 struct pwm_chip *chip = list_entry(v, struct pwm_chip, list);
1024
1025 seq_printf(s, "%s%s/%s, %d PWM device%s\n", (char *)s->private,
1026 chip->dev->bus ? chip->dev->bus->name : "no-bus",
1027 dev_name(chip->dev), chip->npwm,
1028 (chip->npwm != 1) ? "s" : "");
1029
1030 if (chip->ops->dbg_show)
1031 chip->ops->dbg_show(chip, s);
1032 else
1033 pwm_dbg_show(chip, s);
1034
1035 return 0;
1036}
1037
1038static const struct seq_operations pwm_seq_ops = {
1039 .start = pwm_seq_start,
1040 .next = pwm_seq_next,
1041 .stop = pwm_seq_stop,
1042 .show = pwm_seq_show,
1043};
1044
1045static int pwm_seq_open(struct inode *inode, struct file *file)
1046{
1047 return seq_open(file, &pwm_seq_ops);
1048}
1049
1050static const struct file_operations pwm_debugfs_ops = {
1051 .owner = THIS_MODULE,
1052 .open = pwm_seq_open,
1053 .read = seq_read,
1054 .llseek = seq_lseek,
1055 .release = seq_release,
1056};
1057
1058static int __init pwm_debugfs_init(void)
1059{
1060 debugfs_create_file("pwm", S_IFREG | S_IRUGO, NULL, NULL,
1061 &pwm_debugfs_ops);
1062
1063 return 0;
1064}
1065subsys_initcall(pwm_debugfs_init);
1066#endif
1067