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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
141 if (pc->of_pwm_n_cells < 3)
142 return ERR_PTR(-EINVAL);
143
144
145 if (args->args_count < 2)
146 return ERR_PTR(-EINVAL);
147
148 if (args->args[0] >= pc->npwm)
149 return ERR_PTR(-EINVAL);
150
151 pwm = pwm_request_from_chip(pc, args->args[0], NULL);
152 if (IS_ERR(pwm))
153 return pwm;
154
155 pwm->args.period = args->args[1];
156 pwm->args.polarity = PWM_POLARITY_NORMAL;
157
158 if (args->args_count > 2 && args->args[2] & PWM_POLARITY_INVERTED)
159 pwm->args.polarity = PWM_POLARITY_INVERSED;
160
161 return pwm;
162}
163EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags);
164
165static struct pwm_device *
166of_pwm_simple_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
167{
168 struct pwm_device *pwm;
169
170
171 if (pc->of_pwm_n_cells < 2)
172 return ERR_PTR(-EINVAL);
173
174
175 if (args->args_count != pc->of_pwm_n_cells)
176 return ERR_PTR(-EINVAL);
177
178 if (args->args[0] >= pc->npwm)
179 return ERR_PTR(-EINVAL);
180
181 pwm = pwm_request_from_chip(pc, args->args[0], NULL);
182 if (IS_ERR(pwm))
183 return pwm;
184
185 pwm->args.period = args->args[1];
186
187 return pwm;
188}
189
190static void of_pwmchip_add(struct pwm_chip *chip)
191{
192 if (!chip->dev || !chip->dev->of_node)
193 return;
194
195 if (!chip->of_xlate) {
196 chip->of_xlate = of_pwm_simple_xlate;
197 chip->of_pwm_n_cells = 2;
198 }
199
200 of_node_get(chip->dev->of_node);
201}
202
203static void of_pwmchip_remove(struct pwm_chip *chip)
204{
205 if (chip->dev)
206 of_node_put(chip->dev->of_node);
207}
208
209
210
211
212
213
214
215
216int pwm_set_chip_data(struct pwm_device *pwm, void *data)
217{
218 if (!pwm)
219 return -EINVAL;
220
221 pwm->chip_data = data;
222
223 return 0;
224}
225EXPORT_SYMBOL_GPL(pwm_set_chip_data);
226
227
228
229
230
231
232
233void *pwm_get_chip_data(struct pwm_device *pwm)
234{
235 return pwm ? pwm->chip_data : NULL;
236}
237EXPORT_SYMBOL_GPL(pwm_get_chip_data);
238
239static bool pwm_ops_check(const struct pwm_ops *ops)
240{
241
242 if (ops->config && ops->enable && ops->disable)
243 return true;
244
245
246 if (ops->apply)
247 return true;
248
249 return false;
250}
251
252
253
254
255
256
257
258
259
260
261
262
263int pwmchip_add_with_polarity(struct pwm_chip *chip,
264 enum pwm_polarity polarity)
265{
266 struct pwm_device *pwm;
267 unsigned int i;
268 int ret;
269
270 if (!chip || !chip->dev || !chip->ops || !chip->npwm)
271 return -EINVAL;
272
273 if (!pwm_ops_check(chip->ops))
274 return -EINVAL;
275
276 mutex_lock(&pwm_lock);
277
278 ret = alloc_pwms(chip->base, chip->npwm);
279 if (ret < 0)
280 goto out;
281
282 chip->pwms = kcalloc(chip->npwm, sizeof(*pwm), GFP_KERNEL);
283 if (!chip->pwms) {
284 ret = -ENOMEM;
285 goto out;
286 }
287
288 chip->base = ret;
289
290 for (i = 0; i < chip->npwm; i++) {
291 pwm = &chip->pwms[i];
292
293 pwm->chip = chip;
294 pwm->pwm = chip->base + i;
295 pwm->hwpwm = i;
296 pwm->state.polarity = polarity;
297
298 if (chip->ops->get_state)
299 chip->ops->get_state(chip, pwm, &pwm->state);
300
301 radix_tree_insert(&pwm_tree, pwm->pwm, pwm);
302 }
303
304 bitmap_set(allocated_pwms, chip->base, chip->npwm);
305
306 INIT_LIST_HEAD(&chip->list);
307 list_add(&chip->list, &pwm_chips);
308
309 ret = 0;
310
311 if (IS_ENABLED(CONFIG_OF))
312 of_pwmchip_add(chip);
313
314 pwmchip_sysfs_export(chip);
315
316out:
317 mutex_unlock(&pwm_lock);
318 return ret;
319}
320EXPORT_SYMBOL_GPL(pwmchip_add_with_polarity);
321
322
323
324
325
326
327
328
329
330
331int pwmchip_add(struct pwm_chip *chip)
332{
333 return pwmchip_add_with_polarity(chip, PWM_POLARITY_NORMAL);
334}
335EXPORT_SYMBOL_GPL(pwmchip_add);
336
337
338
339
340
341
342
343
344
345
346int pwmchip_remove(struct pwm_chip *chip)
347{
348 unsigned int i;
349 int ret = 0;
350
351 pwmchip_sysfs_unexport_children(chip);
352
353 mutex_lock(&pwm_lock);
354
355 for (i = 0; i < chip->npwm; i++) {
356 struct pwm_device *pwm = &chip->pwms[i];
357
358 if (test_bit(PWMF_REQUESTED, &pwm->flags)) {
359 ret = -EBUSY;
360 goto out;
361 }
362 }
363
364 list_del_init(&chip->list);
365
366 if (IS_ENABLED(CONFIG_OF))
367 of_pwmchip_remove(chip);
368
369 free_pwms(chip);
370
371 pwmchip_sysfs_unexport(chip);
372
373out:
374 mutex_unlock(&pwm_lock);
375 return ret;
376}
377EXPORT_SYMBOL_GPL(pwmchip_remove);
378
379
380
381
382
383
384
385
386
387
388
389struct pwm_device *pwm_request(int pwm, const char *label)
390{
391 struct pwm_device *dev;
392 int err;
393
394 if (pwm < 0 || pwm >= MAX_PWMS)
395 return ERR_PTR(-EINVAL);
396
397 mutex_lock(&pwm_lock);
398
399 dev = pwm_to_device(pwm);
400 if (!dev) {
401 dev = ERR_PTR(-EPROBE_DEFER);
402 goto out;
403 }
404
405 err = pwm_device_request(dev, label);
406 if (err < 0)
407 dev = ERR_PTR(err);
408
409out:
410 mutex_unlock(&pwm_lock);
411
412 return dev;
413}
414EXPORT_SYMBOL_GPL(pwm_request);
415
416
417
418
419
420
421
422
423
424
425
426struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
427 unsigned int index,
428 const char *label)
429{
430 struct pwm_device *pwm;
431 int err;
432
433 if (!chip || index >= chip->npwm)
434 return ERR_PTR(-EINVAL);
435
436 mutex_lock(&pwm_lock);
437 pwm = &chip->pwms[index];
438
439 err = pwm_device_request(pwm, label);
440 if (err < 0)
441 pwm = ERR_PTR(err);
442
443 mutex_unlock(&pwm_lock);
444 return pwm;
445}
446EXPORT_SYMBOL_GPL(pwm_request_from_chip);
447
448
449
450
451
452
453
454void pwm_free(struct pwm_device *pwm)
455{
456 pwm_put(pwm);
457}
458EXPORT_SYMBOL_GPL(pwm_free);
459
460
461
462
463
464
465
466
467int pwm_apply_state(struct pwm_device *pwm, struct pwm_state *state)
468{
469 int err;
470
471 if (!pwm || !state || !state->period ||
472 state->duty_cycle > state->period)
473 return -EINVAL;
474
475 if (!memcmp(state, &pwm->state, sizeof(*state)))
476 return 0;
477
478 if (pwm->chip->ops->apply) {
479 err = pwm->chip->ops->apply(pwm->chip, pwm, state);
480 if (err)
481 return err;
482
483 pwm->state = *state;
484 } else {
485
486
487
488 if (state->polarity != pwm->state.polarity) {
489 if (!pwm->chip->ops->set_polarity)
490 return -ENOTSUPP;
491
492
493
494
495
496
497 if (pwm->state.enabled) {
498 pwm->chip->ops->disable(pwm->chip, pwm);
499 pwm->state.enabled = false;
500 }
501
502 err = pwm->chip->ops->set_polarity(pwm->chip, pwm,
503 state->polarity);
504 if (err)
505 return err;
506
507 pwm->state.polarity = state->polarity;
508 }
509
510 if (state->period != pwm->state.period ||
511 state->duty_cycle != pwm->state.duty_cycle) {
512 err = pwm->chip->ops->config(pwm->chip, pwm,
513 state->duty_cycle,
514 state->period);
515 if (err)
516 return err;
517
518 pwm->state.duty_cycle = state->duty_cycle;
519 pwm->state.period = state->period;
520 }
521
522 if (state->enabled != pwm->state.enabled) {
523 if (state->enabled) {
524 err = pwm->chip->ops->enable(pwm->chip, pwm);
525 if (err)
526 return err;
527 } else {
528 pwm->chip->ops->disable(pwm->chip, pwm);
529 }
530
531 pwm->state.enabled = state->enabled;
532 }
533 }
534
535 return 0;
536}
537EXPORT_SYMBOL_GPL(pwm_apply_state);
538
539
540
541
542
543
544
545
546
547int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result,
548 unsigned long timeout)
549{
550 int err;
551
552 if (!pwm || !pwm->chip->ops)
553 return -EINVAL;
554
555 if (!pwm->chip->ops->capture)
556 return -ENOSYS;
557
558 mutex_lock(&pwm_lock);
559 err = pwm->chip->ops->capture(pwm->chip, pwm, result, timeout);
560 mutex_unlock(&pwm_lock);
561
562 return err;
563}
564EXPORT_SYMBOL_GPL(pwm_capture);
565
566
567
568
569
570
571
572
573
574int pwm_adjust_config(struct pwm_device *pwm)
575{
576 struct pwm_state state;
577 struct pwm_args pargs;
578
579 pwm_get_args(pwm, &pargs);
580 pwm_get_state(pwm, &state);
581
582
583
584
585
586
587
588
589
590 if (!state.period) {
591 state.duty_cycle = 0;
592 state.period = pargs.period;
593 state.polarity = pargs.polarity;
594
595 return pwm_apply_state(pwm, &state);
596 }
597
598
599
600
601
602 if (pargs.period != state.period) {
603 u64 dutycycle = (u64)state.duty_cycle * pargs.period;
604
605 do_div(dutycycle, state.period);
606 state.duty_cycle = dutycycle;
607 state.period = pargs.period;
608 }
609
610
611
612
613 if (pargs.polarity != state.polarity) {
614 state.polarity = pargs.polarity;
615 state.duty_cycle = state.period - state.duty_cycle;
616 }
617
618 return pwm_apply_state(pwm, &state);
619}
620EXPORT_SYMBOL_GPL(pwm_adjust_config);
621
622static struct pwm_chip *of_node_to_pwmchip(struct device_node *np)
623{
624 struct pwm_chip *chip;
625
626 mutex_lock(&pwm_lock);
627
628 list_for_each_entry(chip, &pwm_chips, list)
629 if (chip->dev && chip->dev->of_node == np) {
630 mutex_unlock(&pwm_lock);
631 return chip;
632 }
633
634 mutex_unlock(&pwm_lock);
635
636 return ERR_PTR(-EPROBE_DEFER);
637}
638
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643
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645
646
647
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649
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652
653
654
655
656
657
658struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id)
659{
660 struct pwm_device *pwm = NULL;
661 struct of_phandle_args args;
662 struct pwm_chip *pc;
663 int index = 0;
664 int err;
665
666 if (con_id) {
667 index = of_property_match_string(np, "pwm-names", con_id);
668 if (index < 0)
669 return ERR_PTR(index);
670 }
671
672 err = of_parse_phandle_with_args(np, "pwms", "#pwm-cells", index,
673 &args);
674 if (err) {
675 pr_err("%s(): can't parse \"pwms\" property\n", __func__);
676 return ERR_PTR(err);
677 }
678
679 pc = of_node_to_pwmchip(args.np);
680 if (IS_ERR(pc)) {
681 pr_err("%s(): PWM chip not found\n", __func__);
682 pwm = ERR_CAST(pc);
683 goto put;
684 }
685
686 pwm = pc->of_xlate(pc, &args);
687 if (IS_ERR(pwm))
688 goto put;
689
690
691
692
693
694
695 if (!con_id) {
696 err = of_property_read_string_index(np, "pwm-names", index,
697 &con_id);
698 if (err < 0)
699 con_id = np->name;
700 }
701
702 pwm->label = con_id;
703
704put:
705 of_node_put(args.np);
706
707 return pwm;
708}
709EXPORT_SYMBOL_GPL(of_pwm_get);
710
711
712
713
714
715
716void pwm_add_table(struct pwm_lookup *table, size_t num)
717{
718 mutex_lock(&pwm_lookup_lock);
719
720 while (num--) {
721 list_add_tail(&table->list, &pwm_lookup_list);
722 table++;
723 }
724
725 mutex_unlock(&pwm_lookup_lock);
726}
727
728
729
730
731
732
733void pwm_remove_table(struct pwm_lookup *table, size_t num)
734{
735 mutex_lock(&pwm_lookup_lock);
736
737 while (num--) {
738 list_del(&table->list);
739 table++;
740 }
741
742 mutex_unlock(&pwm_lookup_lock);
743}
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760struct pwm_device *pwm_get(struct device *dev, const char *con_id)
761{
762 const char *dev_id = dev ? dev_name(dev) : NULL;
763 struct pwm_device *pwm;
764 struct pwm_chip *chip;
765 unsigned int best = 0;
766 struct pwm_lookup *p, *chosen = NULL;
767 unsigned int match;
768 int err;
769
770
771 if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node)
772 return of_pwm_get(dev->of_node, con_id);
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794 mutex_lock(&pwm_lookup_lock);
795
796 list_for_each_entry(p, &pwm_lookup_list, list) {
797 match = 0;
798
799 if (p->dev_id) {
800 if (!dev_id || strcmp(p->dev_id, dev_id))
801 continue;
802
803 match += 2;
804 }
805
806 if (p->con_id) {
807 if (!con_id || strcmp(p->con_id, con_id))
808 continue;
809
810 match += 1;
811 }
812
813 if (match > best) {
814 chosen = p;
815
816 if (match != 3)
817 best = match;
818 else
819 break;
820 }
821 }
822
823 mutex_unlock(&pwm_lookup_lock);
824
825 if (!chosen)
826 return ERR_PTR(-ENODEV);
827
828 chip = pwmchip_find_by_name(chosen->provider);
829
830
831
832
833
834
835
836 if (!chip && chosen->module) {
837 err = request_module(chosen->module);
838 if (err == 0)
839 chip = pwmchip_find_by_name(chosen->provider);
840 }
841
842 if (!chip)
843 return ERR_PTR(-EPROBE_DEFER);
844
845 pwm = pwm_request_from_chip(chip, chosen->index, con_id ?: dev_id);
846 if (IS_ERR(pwm))
847 return pwm;
848
849 pwm->args.period = chosen->period;
850 pwm->args.polarity = chosen->polarity;
851
852 return pwm;
853}
854EXPORT_SYMBOL_GPL(pwm_get);
855
856
857
858
859
860void pwm_put(struct pwm_device *pwm)
861{
862 if (!pwm)
863 return;
864
865 mutex_lock(&pwm_lock);
866
867 if (!test_and_clear_bit(PWMF_REQUESTED, &pwm->flags)) {
868 pr_warn("PWM device already freed\n");
869 goto out;
870 }
871
872 if (pwm->chip->ops->free)
873 pwm->chip->ops->free(pwm->chip, pwm);
874
875 pwm->label = NULL;
876
877 module_put(pwm->chip->ops->owner);
878out:
879 mutex_unlock(&pwm_lock);
880}
881EXPORT_SYMBOL_GPL(pwm_put);
882
883static void devm_pwm_release(struct device *dev, void *res)
884{
885 pwm_put(*(struct pwm_device **)res);
886}
887
888
889
890
891
892
893
894
895
896
897
898
899struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id)
900{
901 struct pwm_device **ptr, *pwm;
902
903 ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
904 if (!ptr)
905 return ERR_PTR(-ENOMEM);
906
907 pwm = pwm_get(dev, con_id);
908 if (!IS_ERR(pwm)) {
909 *ptr = pwm;
910 devres_add(dev, ptr);
911 } else {
912 devres_free(ptr);
913 }
914
915 return pwm;
916}
917EXPORT_SYMBOL_GPL(devm_pwm_get);
918
919
920
921
922
923
924
925
926
927
928
929
930
931struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
932 const char *con_id)
933{
934 struct pwm_device **ptr, *pwm;
935
936 ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
937 if (!ptr)
938 return ERR_PTR(-ENOMEM);
939
940 pwm = of_pwm_get(np, con_id);
941 if (!IS_ERR(pwm)) {
942 *ptr = pwm;
943 devres_add(dev, ptr);
944 } else {
945 devres_free(ptr);
946 }
947
948 return pwm;
949}
950EXPORT_SYMBOL_GPL(devm_of_pwm_get);
951
952static int devm_pwm_match(struct device *dev, void *res, void *data)
953{
954 struct pwm_device **p = res;
955
956 if (WARN_ON(!p || !*p))
957 return 0;
958
959 return *p == data;
960}
961
962
963
964
965
966
967
968
969
970
971void devm_pwm_put(struct device *dev, struct pwm_device *pwm)
972{
973 WARN_ON(devres_release(dev, devm_pwm_release, devm_pwm_match, pwm));
974}
975EXPORT_SYMBOL_GPL(devm_pwm_put);
976
977#ifdef CONFIG_DEBUG_FS
978static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s)
979{
980 unsigned int i;
981
982 for (i = 0; i < chip->npwm; i++) {
983 struct pwm_device *pwm = &chip->pwms[i];
984 struct pwm_state state;
985
986 pwm_get_state(pwm, &state);
987
988 seq_printf(s, " pwm-%-3d (%-20.20s):", i, pwm->label);
989
990 if (test_bit(PWMF_REQUESTED, &pwm->flags))
991 seq_puts(s, " requested");
992
993 if (state.enabled)
994 seq_puts(s, " enabled");
995
996 seq_printf(s, " period: %u ns", state.period);
997 seq_printf(s, " duty: %u ns", state.duty_cycle);
998 seq_printf(s, " polarity: %s",
999 state.polarity ? "inverse" : "normal");
1000
1001 seq_puts(s, "\n");
1002 }
1003}
1004
1005static void *pwm_seq_start(struct seq_file *s, loff_t *pos)
1006{
1007 mutex_lock(&pwm_lock);
1008 s->private = "";
1009
1010 return seq_list_start(&pwm_chips, *pos);
1011}
1012
1013static void *pwm_seq_next(struct seq_file *s, void *v, loff_t *pos)
1014{
1015 s->private = "\n";
1016
1017 return seq_list_next(v, &pwm_chips, pos);
1018}
1019
1020static void pwm_seq_stop(struct seq_file *s, void *v)
1021{
1022 mutex_unlock(&pwm_lock);
1023}
1024
1025static int pwm_seq_show(struct seq_file *s, void *v)
1026{
1027 struct pwm_chip *chip = list_entry(v, struct pwm_chip, list);
1028
1029 seq_printf(s, "%s%s/%s, %d PWM device%s\n", (char *)s->private,
1030 chip->dev->bus ? chip->dev->bus->name : "no-bus",
1031 dev_name(chip->dev), chip->npwm,
1032 (chip->npwm != 1) ? "s" : "");
1033
1034 if (chip->ops->dbg_show)
1035 chip->ops->dbg_show(chip, s);
1036 else
1037 pwm_dbg_show(chip, s);
1038
1039 return 0;
1040}
1041
1042static const struct seq_operations pwm_seq_ops = {
1043 .start = pwm_seq_start,
1044 .next = pwm_seq_next,
1045 .stop = pwm_seq_stop,
1046 .show = pwm_seq_show,
1047};
1048
1049static int pwm_seq_open(struct inode *inode, struct file *file)
1050{
1051 return seq_open(file, &pwm_seq_ops);
1052}
1053
1054static const struct file_operations pwm_debugfs_ops = {
1055 .owner = THIS_MODULE,
1056 .open = pwm_seq_open,
1057 .read = seq_read,
1058 .llseek = seq_lseek,
1059 .release = seq_release,
1060};
1061
1062static int __init pwm_debugfs_init(void)
1063{
1064 debugfs_create_file("pwm", S_IFREG | S_IRUGO, NULL, NULL,
1065 &pwm_debugfs_ops);
1066
1067 return 0;
1068}
1069subsys_initcall(pwm_debugfs_init);
1070#endif
1071