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9#include <linux/acpi.h>
10#include <linux/module.h>
11#include <linux/pwm.h>
12#include <linux/radix-tree.h>
13#include <linux/list.h>
14#include <linux/mutex.h>
15#include <linux/err.h>
16#include <linux/slab.h>
17#include <linux/device.h>
18#include <linux/debugfs.h>
19#include <linux/seq_file.h>
20
21#include <dt-bindings/pwm/pwm.h>
22
23#define MAX_PWMS 1024
24
25static DEFINE_MUTEX(pwm_lookup_lock);
26static LIST_HEAD(pwm_lookup_list);
27static DEFINE_MUTEX(pwm_lock);
28static LIST_HEAD(pwm_chips);
29static DECLARE_BITMAP(allocated_pwms, MAX_PWMS);
30static RADIX_TREE(pwm_tree, GFP_KERNEL);
31
32static struct pwm_device *pwm_to_device(unsigned int pwm)
33{
34 return radix_tree_lookup(&pwm_tree, pwm);
35}
36
37static int alloc_pwms(int pwm, unsigned int count)
38{
39 unsigned int from = 0;
40 unsigned int start;
41
42 if (pwm >= MAX_PWMS)
43 return -EINVAL;
44
45 if (pwm >= 0)
46 from = pwm;
47
48 start = bitmap_find_next_zero_area(allocated_pwms, MAX_PWMS, from,
49 count, 0);
50
51 if (pwm >= 0 && start != pwm)
52 return -EEXIST;
53
54 if (start + count > MAX_PWMS)
55 return -ENOSPC;
56
57 return start;
58}
59
60static void free_pwms(struct pwm_chip *chip)
61{
62 unsigned int i;
63
64 for (i = 0; i < chip->npwm; i++) {
65 struct pwm_device *pwm = &chip->pwms[i];
66
67 radix_tree_delete(&pwm_tree, pwm->pwm);
68 }
69
70 bitmap_clear(allocated_pwms, chip->base, chip->npwm);
71
72 kfree(chip->pwms);
73 chip->pwms = NULL;
74}
75
76static struct pwm_chip *pwmchip_find_by_name(const char *name)
77{
78 struct pwm_chip *chip;
79
80 if (!name)
81 return NULL;
82
83 mutex_lock(&pwm_lock);
84
85 list_for_each_entry(chip, &pwm_chips, list) {
86 const char *chip_name = dev_name(chip->dev);
87
88 if (chip_name && strcmp(chip_name, name) == 0) {
89 mutex_unlock(&pwm_lock);
90 return chip;
91 }
92 }
93
94 mutex_unlock(&pwm_lock);
95
96 return NULL;
97}
98
99static int pwm_device_request(struct pwm_device *pwm, const char *label)
100{
101 int err;
102
103 if (test_bit(PWMF_REQUESTED, &pwm->flags))
104 return -EBUSY;
105
106 if (!try_module_get(pwm->chip->ops->owner))
107 return -ENODEV;
108
109 if (pwm->chip->ops->request) {
110 err = pwm->chip->ops->request(pwm->chip, pwm);
111 if (err) {
112 module_put(pwm->chip->ops->owner);
113 return err;
114 }
115 }
116
117 set_bit(PWMF_REQUESTED, &pwm->flags);
118 pwm->label = label;
119
120 return 0;
121}
122
123struct pwm_device *
124of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args)
125{
126 struct pwm_device *pwm;
127
128
129 if (pc->of_pwm_n_cells < 3)
130 return ERR_PTR(-EINVAL);
131
132
133 if (args->args_count < 2)
134 return ERR_PTR(-EINVAL);
135
136 if (args->args[0] >= pc->npwm)
137 return ERR_PTR(-EINVAL);
138
139 pwm = pwm_request_from_chip(pc, args->args[0], NULL);
140 if (IS_ERR(pwm))
141 return pwm;
142
143 pwm->args.period = args->args[1];
144 pwm->args.polarity = PWM_POLARITY_NORMAL;
145
146 if (args->args_count > 2 && args->args[2] & PWM_POLARITY_INVERTED)
147 pwm->args.polarity = PWM_POLARITY_INVERSED;
148
149 return pwm;
150}
151EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags);
152
153static struct pwm_device *
154of_pwm_simple_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
155{
156 struct pwm_device *pwm;
157
158
159 if (pc->of_pwm_n_cells < 2)
160 return ERR_PTR(-EINVAL);
161
162
163 if (args->args_count != pc->of_pwm_n_cells)
164 return ERR_PTR(-EINVAL);
165
166 if (args->args[0] >= pc->npwm)
167 return ERR_PTR(-EINVAL);
168
169 pwm = pwm_request_from_chip(pc, args->args[0], NULL);
170 if (IS_ERR(pwm))
171 return pwm;
172
173 pwm->args.period = args->args[1];
174
175 return pwm;
176}
177
178static void of_pwmchip_add(struct pwm_chip *chip)
179{
180 if (!chip->dev || !chip->dev->of_node)
181 return;
182
183 if (!chip->of_xlate) {
184 chip->of_xlate = of_pwm_simple_xlate;
185 chip->of_pwm_n_cells = 2;
186 }
187
188 of_node_get(chip->dev->of_node);
189}
190
191static void of_pwmchip_remove(struct pwm_chip *chip)
192{
193 if (chip->dev)
194 of_node_put(chip->dev->of_node);
195}
196
197
198
199
200
201
202
203
204int pwm_set_chip_data(struct pwm_device *pwm, void *data)
205{
206 if (!pwm)
207 return -EINVAL;
208
209 pwm->chip_data = data;
210
211 return 0;
212}
213EXPORT_SYMBOL_GPL(pwm_set_chip_data);
214
215
216
217
218
219
220
221void *pwm_get_chip_data(struct pwm_device *pwm)
222{
223 return pwm ? pwm->chip_data : NULL;
224}
225EXPORT_SYMBOL_GPL(pwm_get_chip_data);
226
227static bool pwm_ops_check(const struct pwm_ops *ops)
228{
229
230 if (ops->config && ops->enable && ops->disable)
231 return true;
232
233
234 if (ops->apply)
235 return true;
236
237 return false;
238}
239
240
241
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243
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245
246
247
248
249
250
251int pwmchip_add_with_polarity(struct pwm_chip *chip,
252 enum pwm_polarity polarity)
253{
254 struct pwm_device *pwm;
255 unsigned int i;
256 int ret;
257
258 if (!chip || !chip->dev || !chip->ops || !chip->npwm)
259 return -EINVAL;
260
261 if (!pwm_ops_check(chip->ops))
262 return -EINVAL;
263
264 mutex_lock(&pwm_lock);
265
266 ret = alloc_pwms(chip->base, chip->npwm);
267 if (ret < 0)
268 goto out;
269
270 chip->pwms = kcalloc(chip->npwm, sizeof(*pwm), GFP_KERNEL);
271 if (!chip->pwms) {
272 ret = -ENOMEM;
273 goto out;
274 }
275
276 chip->base = ret;
277
278 for (i = 0; i < chip->npwm; i++) {
279 pwm = &chip->pwms[i];
280
281 pwm->chip = chip;
282 pwm->pwm = chip->base + i;
283 pwm->hwpwm = i;
284 pwm->state.polarity = polarity;
285
286 if (chip->ops->get_state)
287 chip->ops->get_state(chip, pwm, &pwm->state);
288
289 radix_tree_insert(&pwm_tree, pwm->pwm, pwm);
290 }
291
292 bitmap_set(allocated_pwms, chip->base, chip->npwm);
293
294 INIT_LIST_HEAD(&chip->list);
295 list_add(&chip->list, &pwm_chips);
296
297 ret = 0;
298
299 if (IS_ENABLED(CONFIG_OF))
300 of_pwmchip_add(chip);
301
302out:
303 mutex_unlock(&pwm_lock);
304
305 if (!ret)
306 pwmchip_sysfs_export(chip);
307
308 return ret;
309}
310EXPORT_SYMBOL_GPL(pwmchip_add_with_polarity);
311
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319
320
321int pwmchip_add(struct pwm_chip *chip)
322{
323 return pwmchip_add_with_polarity(chip, PWM_POLARITY_NORMAL);
324}
325EXPORT_SYMBOL_GPL(pwmchip_add);
326
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328
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330
331
332
333
334
335
336int pwmchip_remove(struct pwm_chip *chip)
337{
338 unsigned int i;
339 int ret = 0;
340
341 pwmchip_sysfs_unexport(chip);
342
343 mutex_lock(&pwm_lock);
344
345 for (i = 0; i < chip->npwm; i++) {
346 struct pwm_device *pwm = &chip->pwms[i];
347
348 if (test_bit(PWMF_REQUESTED, &pwm->flags)) {
349 ret = -EBUSY;
350 goto out;
351 }
352 }
353
354 list_del_init(&chip->list);
355
356 if (IS_ENABLED(CONFIG_OF))
357 of_pwmchip_remove(chip);
358
359 free_pwms(chip);
360
361out:
362 mutex_unlock(&pwm_lock);
363 return ret;
364}
365EXPORT_SYMBOL_GPL(pwmchip_remove);
366
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370
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373
374
375
376
377struct pwm_device *pwm_request(int pwm, const char *label)
378{
379 struct pwm_device *dev;
380 int err;
381
382 if (pwm < 0 || pwm >= MAX_PWMS)
383 return ERR_PTR(-EINVAL);
384
385 mutex_lock(&pwm_lock);
386
387 dev = pwm_to_device(pwm);
388 if (!dev) {
389 dev = ERR_PTR(-EPROBE_DEFER);
390 goto out;
391 }
392
393 err = pwm_device_request(dev, label);
394 if (err < 0)
395 dev = ERR_PTR(err);
396
397out:
398 mutex_unlock(&pwm_lock);
399
400 return dev;
401}
402EXPORT_SYMBOL_GPL(pwm_request);
403
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411
412
413
414struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
415 unsigned int index,
416 const char *label)
417{
418 struct pwm_device *pwm;
419 int err;
420
421 if (!chip || index >= chip->npwm)
422 return ERR_PTR(-EINVAL);
423
424 mutex_lock(&pwm_lock);
425 pwm = &chip->pwms[index];
426
427 err = pwm_device_request(pwm, label);
428 if (err < 0)
429 pwm = ERR_PTR(err);
430
431 mutex_unlock(&pwm_lock);
432 return pwm;
433}
434EXPORT_SYMBOL_GPL(pwm_request_from_chip);
435
436
437
438
439
440
441
442void pwm_free(struct pwm_device *pwm)
443{
444 pwm_put(pwm);
445}
446EXPORT_SYMBOL_GPL(pwm_free);
447
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453
454
455int pwm_apply_state(struct pwm_device *pwm, struct pwm_state *state)
456{
457 int err;
458
459 if (!pwm || !state || !state->period ||
460 state->duty_cycle > state->period)
461 return -EINVAL;
462
463 if (state->period == pwm->state.period &&
464 state->duty_cycle == pwm->state.duty_cycle &&
465 state->polarity == pwm->state.polarity &&
466 state->enabled == pwm->state.enabled)
467 return 0;
468
469 if (pwm->chip->ops->apply) {
470 err = pwm->chip->ops->apply(pwm->chip, pwm, state);
471 if (err)
472 return err;
473
474 pwm->state = *state;
475 } else {
476
477
478
479 if (state->polarity != pwm->state.polarity) {
480 if (!pwm->chip->ops->set_polarity)
481 return -ENOTSUPP;
482
483
484
485
486
487
488 if (pwm->state.enabled) {
489 pwm->chip->ops->disable(pwm->chip, pwm);
490 pwm->state.enabled = false;
491 }
492
493 err = pwm->chip->ops->set_polarity(pwm->chip, pwm,
494 state->polarity);
495 if (err)
496 return err;
497
498 pwm->state.polarity = state->polarity;
499 }
500
501 if (state->period != pwm->state.period ||
502 state->duty_cycle != pwm->state.duty_cycle) {
503 err = pwm->chip->ops->config(pwm->chip, pwm,
504 state->duty_cycle,
505 state->period);
506 if (err)
507 return err;
508
509 pwm->state.duty_cycle = state->duty_cycle;
510 pwm->state.period = state->period;
511 }
512
513 if (state->enabled != pwm->state.enabled) {
514 if (state->enabled) {
515 err = pwm->chip->ops->enable(pwm->chip, pwm);
516 if (err)
517 return err;
518 } else {
519 pwm->chip->ops->disable(pwm->chip, pwm);
520 }
521
522 pwm->state.enabled = state->enabled;
523 }
524 }
525
526 return 0;
527}
528EXPORT_SYMBOL_GPL(pwm_apply_state);
529
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537
538int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result,
539 unsigned long timeout)
540{
541 int err;
542
543 if (!pwm || !pwm->chip->ops)
544 return -EINVAL;
545
546 if (!pwm->chip->ops->capture)
547 return -ENOSYS;
548
549 mutex_lock(&pwm_lock);
550 err = pwm->chip->ops->capture(pwm->chip, pwm, result, timeout);
551 mutex_unlock(&pwm_lock);
552
553 return err;
554}
555EXPORT_SYMBOL_GPL(pwm_capture);
556
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564
565int pwm_adjust_config(struct pwm_device *pwm)
566{
567 struct pwm_state state;
568 struct pwm_args pargs;
569
570 pwm_get_args(pwm, &pargs);
571 pwm_get_state(pwm, &state);
572
573
574
575
576
577
578
579
580
581 if (!state.period) {
582 state.duty_cycle = 0;
583 state.period = pargs.period;
584 state.polarity = pargs.polarity;
585
586 return pwm_apply_state(pwm, &state);
587 }
588
589
590
591
592
593 if (pargs.period != state.period) {
594 u64 dutycycle = (u64)state.duty_cycle * pargs.period;
595
596 do_div(dutycycle, state.period);
597 state.duty_cycle = dutycycle;
598 state.period = pargs.period;
599 }
600
601
602
603
604 if (pargs.polarity != state.polarity) {
605 state.polarity = pargs.polarity;
606 state.duty_cycle = state.period - state.duty_cycle;
607 }
608
609 return pwm_apply_state(pwm, &state);
610}
611EXPORT_SYMBOL_GPL(pwm_adjust_config);
612
613static struct pwm_chip *of_node_to_pwmchip(struct device_node *np)
614{
615 struct pwm_chip *chip;
616
617 mutex_lock(&pwm_lock);
618
619 list_for_each_entry(chip, &pwm_chips, list)
620 if (chip->dev && chip->dev->of_node == np) {
621 mutex_unlock(&pwm_lock);
622 return chip;
623 }
624
625 mutex_unlock(&pwm_lock);
626
627 return ERR_PTR(-EPROBE_DEFER);
628}
629
630static struct device_link *pwm_device_link_add(struct device *dev,
631 struct pwm_device *pwm)
632{
633 struct device_link *dl;
634
635 if (!dev) {
636
637
638
639
640
641 dev_warn(pwm->chip->dev,
642 "No consumer device specified to create a link to\n");
643 return NULL;
644 }
645
646 dl = device_link_add(dev, pwm->chip->dev, DL_FLAG_AUTOREMOVE_CONSUMER);
647 if (!dl) {
648 dev_err(dev, "failed to create device link to %s\n",
649 dev_name(pwm->chip->dev));
650 return ERR_PTR(-EINVAL);
651 }
652
653 return dl;
654}
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675
676struct pwm_device *of_pwm_get(struct device *dev, struct device_node *np,
677 const char *con_id)
678{
679 struct pwm_device *pwm = NULL;
680 struct of_phandle_args args;
681 struct device_link *dl;
682 struct pwm_chip *pc;
683 int index = 0;
684 int err;
685
686 if (con_id) {
687 index = of_property_match_string(np, "pwm-names", con_id);
688 if (index < 0)
689 return ERR_PTR(index);
690 }
691
692 err = of_parse_phandle_with_args(np, "pwms", "#pwm-cells", index,
693 &args);
694 if (err) {
695 pr_err("%s(): can't parse \"pwms\" property\n", __func__);
696 return ERR_PTR(err);
697 }
698
699 pc = of_node_to_pwmchip(args.np);
700 if (IS_ERR(pc)) {
701 if (PTR_ERR(pc) != -EPROBE_DEFER)
702 pr_err("%s(): PWM chip not found\n", __func__);
703
704 pwm = ERR_CAST(pc);
705 goto put;
706 }
707
708 pwm = pc->of_xlate(pc, &args);
709 if (IS_ERR(pwm))
710 goto put;
711
712 dl = pwm_device_link_add(dev, pwm);
713 if (IS_ERR(dl)) {
714
715 pwm_free(pwm);
716 pwm = ERR_CAST(dl);
717 goto put;
718 }
719
720
721
722
723
724
725 if (!con_id) {
726 err = of_property_read_string_index(np, "pwm-names", index,
727 &con_id);
728 if (err < 0)
729 con_id = np->name;
730 }
731
732 pwm->label = con_id;
733
734put:
735 of_node_put(args.np);
736
737 return pwm;
738}
739EXPORT_SYMBOL_GPL(of_pwm_get);
740
741#if IS_ENABLED(CONFIG_ACPI)
742static struct pwm_chip *device_to_pwmchip(struct device *dev)
743{
744 struct pwm_chip *chip;
745
746 mutex_lock(&pwm_lock);
747
748 list_for_each_entry(chip, &pwm_chips, list) {
749 struct acpi_device *adev = ACPI_COMPANION(chip->dev);
750
751 if ((chip->dev == dev) || (adev && &adev->dev == dev)) {
752 mutex_unlock(&pwm_lock);
753 return chip;
754 }
755 }
756
757 mutex_unlock(&pwm_lock);
758
759 return ERR_PTR(-EPROBE_DEFER);
760}
761#endif
762
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779
780static struct pwm_device *acpi_pwm_get(struct fwnode_handle *fwnode)
781{
782 struct pwm_device *pwm = ERR_PTR(-ENODEV);
783#if IS_ENABLED(CONFIG_ACPI)
784 struct fwnode_reference_args args;
785 struct acpi_device *acpi;
786 struct pwm_chip *chip;
787 int ret;
788
789 memset(&args, 0, sizeof(args));
790
791 ret = __acpi_node_get_property_reference(fwnode, "pwms", 0, 3, &args);
792 if (ret < 0)
793 return ERR_PTR(ret);
794
795 acpi = to_acpi_device_node(args.fwnode);
796 if (!acpi)
797 return ERR_PTR(-EINVAL);
798
799 if (args.nargs < 2)
800 return ERR_PTR(-EPROTO);
801
802 chip = device_to_pwmchip(&acpi->dev);
803 if (IS_ERR(chip))
804 return ERR_CAST(chip);
805
806 pwm = pwm_request_from_chip(chip, args.args[0], NULL);
807 if (IS_ERR(pwm))
808 return pwm;
809
810 pwm->args.period = args.args[1];
811 pwm->args.polarity = PWM_POLARITY_NORMAL;
812
813 if (args.nargs > 2 && args.args[2] & PWM_POLARITY_INVERTED)
814 pwm->args.polarity = PWM_POLARITY_INVERSED;
815#endif
816
817 return pwm;
818}
819
820
821
822
823
824
825void pwm_add_table(struct pwm_lookup *table, size_t num)
826{
827 mutex_lock(&pwm_lookup_lock);
828
829 while (num--) {
830 list_add_tail(&table->list, &pwm_lookup_list);
831 table++;
832 }
833
834 mutex_unlock(&pwm_lookup_lock);
835}
836
837
838
839
840
841
842void pwm_remove_table(struct pwm_lookup *table, size_t num)
843{
844 mutex_lock(&pwm_lookup_lock);
845
846 while (num--) {
847 list_del(&table->list);
848 table++;
849 }
850
851 mutex_unlock(&pwm_lookup_lock);
852}
853
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868
869struct pwm_device *pwm_get(struct device *dev, const char *con_id)
870{
871 const char *dev_id = dev ? dev_name(dev) : NULL;
872 struct pwm_device *pwm;
873 struct pwm_chip *chip;
874 struct device_link *dl;
875 unsigned int best = 0;
876 struct pwm_lookup *p, *chosen = NULL;
877 unsigned int match;
878 int err;
879
880
881 if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node)
882 return of_pwm_get(dev, dev->of_node, con_id);
883
884
885 if (dev && is_acpi_node(dev->fwnode)) {
886 pwm = acpi_pwm_get(dev->fwnode);
887 if (!IS_ERR(pwm) || PTR_ERR(pwm) != -ENOENT)
888 return pwm;
889 }
890
891
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910
911 mutex_lock(&pwm_lookup_lock);
912
913 list_for_each_entry(p, &pwm_lookup_list, list) {
914 match = 0;
915
916 if (p->dev_id) {
917 if (!dev_id || strcmp(p->dev_id, dev_id))
918 continue;
919
920 match += 2;
921 }
922
923 if (p->con_id) {
924 if (!con_id || strcmp(p->con_id, con_id))
925 continue;
926
927 match += 1;
928 }
929
930 if (match > best) {
931 chosen = p;
932
933 if (match != 3)
934 best = match;
935 else
936 break;
937 }
938 }
939
940 mutex_unlock(&pwm_lookup_lock);
941
942 if (!chosen)
943 return ERR_PTR(-ENODEV);
944
945 chip = pwmchip_find_by_name(chosen->provider);
946
947
948
949
950
951
952
953 if (!chip && chosen->module) {
954 err = request_module(chosen->module);
955 if (err == 0)
956 chip = pwmchip_find_by_name(chosen->provider);
957 }
958
959 if (!chip)
960 return ERR_PTR(-EPROBE_DEFER);
961
962 pwm = pwm_request_from_chip(chip, chosen->index, con_id ?: dev_id);
963 if (IS_ERR(pwm))
964 return pwm;
965
966 dl = pwm_device_link_add(dev, pwm);
967 if (IS_ERR(dl)) {
968 pwm_free(pwm);
969 return ERR_CAST(dl);
970 }
971
972 pwm->args.period = chosen->period;
973 pwm->args.polarity = chosen->polarity;
974
975 return pwm;
976}
977EXPORT_SYMBOL_GPL(pwm_get);
978
979
980
981
982
983void pwm_put(struct pwm_device *pwm)
984{
985 if (!pwm)
986 return;
987
988 mutex_lock(&pwm_lock);
989
990 if (!test_and_clear_bit(PWMF_REQUESTED, &pwm->flags)) {
991 pr_warn("PWM device already freed\n");
992 goto out;
993 }
994
995 if (pwm->chip->ops->free)
996 pwm->chip->ops->free(pwm->chip, pwm);
997
998 pwm_set_chip_data(pwm, NULL);
999 pwm->label = NULL;
1000
1001 module_put(pwm->chip->ops->owner);
1002out:
1003 mutex_unlock(&pwm_lock);
1004}
1005EXPORT_SYMBOL_GPL(pwm_put);
1006
1007static void devm_pwm_release(struct device *dev, void *res)
1008{
1009 pwm_put(*(struct pwm_device **)res);
1010}
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id)
1024{
1025 struct pwm_device **ptr, *pwm;
1026
1027 ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
1028 if (!ptr)
1029 return ERR_PTR(-ENOMEM);
1030
1031 pwm = pwm_get(dev, con_id);
1032 if (!IS_ERR(pwm)) {
1033 *ptr = pwm;
1034 devres_add(dev, ptr);
1035 } else {
1036 devres_free(ptr);
1037 }
1038
1039 return pwm;
1040}
1041EXPORT_SYMBOL_GPL(devm_pwm_get);
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
1056 const char *con_id)
1057{
1058 struct pwm_device **ptr, *pwm;
1059
1060 ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
1061 if (!ptr)
1062 return ERR_PTR(-ENOMEM);
1063
1064 pwm = of_pwm_get(dev, np, con_id);
1065 if (!IS_ERR(pwm)) {
1066 *ptr = pwm;
1067 devres_add(dev, ptr);
1068 } else {
1069 devres_free(ptr);
1070 }
1071
1072 return pwm;
1073}
1074EXPORT_SYMBOL_GPL(devm_of_pwm_get);
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088struct pwm_device *devm_fwnode_pwm_get(struct device *dev,
1089 struct fwnode_handle *fwnode,
1090 const char *con_id)
1091{
1092 struct pwm_device **ptr, *pwm = ERR_PTR(-ENODEV);
1093
1094 ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
1095 if (!ptr)
1096 return ERR_PTR(-ENOMEM);
1097
1098 if (is_of_node(fwnode))
1099 pwm = of_pwm_get(dev, to_of_node(fwnode), con_id);
1100 else if (is_acpi_node(fwnode))
1101 pwm = acpi_pwm_get(fwnode);
1102
1103 if (!IS_ERR(pwm)) {
1104 *ptr = pwm;
1105 devres_add(dev, ptr);
1106 } else {
1107 devres_free(ptr);
1108 }
1109
1110 return pwm;
1111}
1112EXPORT_SYMBOL_GPL(devm_fwnode_pwm_get);
1113
1114static int devm_pwm_match(struct device *dev, void *res, void *data)
1115{
1116 struct pwm_device **p = res;
1117
1118 if (WARN_ON(!p || !*p))
1119 return 0;
1120
1121 return *p == data;
1122}
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133void devm_pwm_put(struct device *dev, struct pwm_device *pwm)
1134{
1135 WARN_ON(devres_release(dev, devm_pwm_release, devm_pwm_match, pwm));
1136}
1137EXPORT_SYMBOL_GPL(devm_pwm_put);
1138
1139#ifdef CONFIG_DEBUG_FS
1140static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s)
1141{
1142 unsigned int i;
1143
1144 for (i = 0; i < chip->npwm; i++) {
1145 struct pwm_device *pwm = &chip->pwms[i];
1146 struct pwm_state state;
1147
1148 pwm_get_state(pwm, &state);
1149
1150 seq_printf(s, " pwm-%-3d (%-20.20s):", i, pwm->label);
1151
1152 if (test_bit(PWMF_REQUESTED, &pwm->flags))
1153 seq_puts(s, " requested");
1154
1155 if (state.enabled)
1156 seq_puts(s, " enabled");
1157
1158 seq_printf(s, " period: %u ns", state.period);
1159 seq_printf(s, " duty: %u ns", state.duty_cycle);
1160 seq_printf(s, " polarity: %s",
1161 state.polarity ? "inverse" : "normal");
1162
1163 seq_puts(s, "\n");
1164 }
1165}
1166
1167static void *pwm_seq_start(struct seq_file *s, loff_t *pos)
1168{
1169 mutex_lock(&pwm_lock);
1170 s->private = "";
1171
1172 return seq_list_start(&pwm_chips, *pos);
1173}
1174
1175static void *pwm_seq_next(struct seq_file *s, void *v, loff_t *pos)
1176{
1177 s->private = "\n";
1178
1179 return seq_list_next(v, &pwm_chips, pos);
1180}
1181
1182static void pwm_seq_stop(struct seq_file *s, void *v)
1183{
1184 mutex_unlock(&pwm_lock);
1185}
1186
1187static int pwm_seq_show(struct seq_file *s, void *v)
1188{
1189 struct pwm_chip *chip = list_entry(v, struct pwm_chip, list);
1190
1191 seq_printf(s, "%s%s/%s, %d PWM device%s\n", (char *)s->private,
1192 chip->dev->bus ? chip->dev->bus->name : "no-bus",
1193 dev_name(chip->dev), chip->npwm,
1194 (chip->npwm != 1) ? "s" : "");
1195
1196 pwm_dbg_show(chip, s);
1197
1198 return 0;
1199}
1200
1201static const struct seq_operations pwm_seq_ops = {
1202 .start = pwm_seq_start,
1203 .next = pwm_seq_next,
1204 .stop = pwm_seq_stop,
1205 .show = pwm_seq_show,
1206};
1207
1208static int pwm_seq_open(struct inode *inode, struct file *file)
1209{
1210 return seq_open(file, &pwm_seq_ops);
1211}
1212
1213static const struct file_operations pwm_debugfs_ops = {
1214 .owner = THIS_MODULE,
1215 .open = pwm_seq_open,
1216 .read = seq_read,
1217 .llseek = seq_lseek,
1218 .release = seq_release,
1219};
1220
1221static int __init pwm_debugfs_init(void)
1222{
1223 debugfs_create_file("pwm", S_IFREG | S_IRUGO, NULL, NULL,
1224 &pwm_debugfs_ops);
1225
1226 return 0;
1227}
1228subsys_initcall(pwm_debugfs_init);
1229#endif
1230