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13
14#define pr_fmt(fmt) "pinctrl core: " fmt
15
16#include <linux/kernel.h>
17#include <linux/kref.h>
18#include <linux/export.h>
19#include <linux/init.h>
20#include <linux/device.h>
21#include <linux/slab.h>
22#include <linux/err.h>
23#include <linux/list.h>
24#include <linux/sysfs.h>
25#include <linux/debugfs.h>
26#include <linux/seq_file.h>
27#include <linux/pinctrl/consumer.h>
28#include <linux/pinctrl/pinctrl.h>
29#include <linux/pinctrl/machine.h>
30
31#ifdef CONFIG_GPIOLIB
32#include <asm-generic/gpio.h>
33#endif
34
35#include "core.h"
36#include "devicetree.h"
37#include "pinmux.h"
38#include "pinconf.h"
39
40
41static bool pinctrl_dummy_state;
42
43
44static DEFINE_MUTEX(pinctrl_list_mutex);
45
46
47DEFINE_MUTEX(pinctrl_maps_mutex);
48
49
50static DEFINE_MUTEX(pinctrldev_list_mutex);
51
52
53static LIST_HEAD(pinctrldev_list);
54
55
56static LIST_HEAD(pinctrl_list);
57
58
59LIST_HEAD(pinctrl_maps);
60
61
62
63
64
65
66
67
68
69
70void pinctrl_provide_dummies(void)
71{
72 pinctrl_dummy_state = true;
73}
74
75const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev)
76{
77
78 return pctldev->desc->name;
79}
80EXPORT_SYMBOL_GPL(pinctrl_dev_get_name);
81
82const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev)
83{
84 return dev_name(pctldev->dev);
85}
86EXPORT_SYMBOL_GPL(pinctrl_dev_get_devname);
87
88void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev)
89{
90 return pctldev->driver_data;
91}
92EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata);
93
94
95
96
97
98
99
100
101struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname)
102{
103 struct pinctrl_dev *pctldev = NULL;
104
105 if (!devname)
106 return NULL;
107
108 mutex_lock(&pinctrldev_list_mutex);
109
110 list_for_each_entry(pctldev, &pinctrldev_list, node) {
111 if (!strcmp(dev_name(pctldev->dev), devname)) {
112
113 mutex_unlock(&pinctrldev_list_mutex);
114 return pctldev;
115 }
116 }
117
118 mutex_unlock(&pinctrldev_list_mutex);
119
120 return NULL;
121}
122
123struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np)
124{
125 struct pinctrl_dev *pctldev;
126
127 mutex_lock(&pinctrldev_list_mutex);
128
129 list_for_each_entry(pctldev, &pinctrldev_list, node)
130 if (pctldev->dev->of_node == np) {
131 mutex_unlock(&pinctrldev_list_mutex);
132 return pctldev;
133 }
134
135 mutex_unlock(&pinctrldev_list_mutex);
136
137 return NULL;
138}
139
140
141
142
143
144
145int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name)
146{
147 unsigned i, pin;
148
149
150 for (i = 0; i < pctldev->desc->npins; i++) {
151 struct pin_desc *desc;
152
153 pin = pctldev->desc->pins[i].number;
154 desc = pin_desc_get(pctldev, pin);
155
156 if (desc && !strcmp(name, desc->name))
157 return pin;
158 }
159
160 return -EINVAL;
161}
162
163
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165
166
167
168const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin)
169{
170 const struct pin_desc *desc;
171
172 desc = pin_desc_get(pctldev, pin);
173 if (!desc) {
174 dev_err(pctldev->dev, "failed to get pin(%d) name\n",
175 pin);
176 return NULL;
177 }
178
179 return desc->name;
180}
181
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188
189
190bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
191{
192 struct pin_desc *pindesc;
193
194 if (pin < 0)
195 return false;
196
197 mutex_lock(&pctldev->mutex);
198 pindesc = pin_desc_get(pctldev, pin);
199 mutex_unlock(&pctldev->mutex);
200
201 return pindesc != NULL;
202}
203EXPORT_SYMBOL_GPL(pin_is_valid);
204
205
206static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev,
207 const struct pinctrl_pin_desc *pins,
208 unsigned num_pins)
209{
210 int i;
211
212 for (i = 0; i < num_pins; i++) {
213 struct pin_desc *pindesc;
214
215 pindesc = radix_tree_lookup(&pctldev->pin_desc_tree,
216 pins[i].number);
217 if (pindesc) {
218 radix_tree_delete(&pctldev->pin_desc_tree,
219 pins[i].number);
220 if (pindesc->dynamic_name)
221 kfree(pindesc->name);
222 }
223 kfree(pindesc);
224 }
225}
226
227static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
228 const struct pinctrl_pin_desc *pin)
229{
230 struct pin_desc *pindesc;
231
232 pindesc = pin_desc_get(pctldev, pin->number);
233 if (pindesc) {
234 dev_err(pctldev->dev, "pin %d already registered\n",
235 pin->number);
236 return -EINVAL;
237 }
238
239 pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL);
240 if (!pindesc)
241 return -ENOMEM;
242
243
244 pindesc->pctldev = pctldev;
245
246
247 if (pin->name) {
248 pindesc->name = pin->name;
249 } else {
250 pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", pin->number);
251 if (!pindesc->name) {
252 kfree(pindesc);
253 return -ENOMEM;
254 }
255 pindesc->dynamic_name = true;
256 }
257
258 pindesc->drv_data = pin->drv_data;
259
260 radix_tree_insert(&pctldev->pin_desc_tree, pin->number, pindesc);
261 pr_debug("registered pin %d (%s) on %s\n",
262 pin->number, pindesc->name, pctldev->desc->name);
263 return 0;
264}
265
266static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
267 struct pinctrl_pin_desc const *pins,
268 unsigned num_descs)
269{
270 unsigned i;
271 int ret = 0;
272
273 for (i = 0; i < num_descs; i++) {
274 ret = pinctrl_register_one_pin(pctldev, &pins[i]);
275 if (ret)
276 return ret;
277 }
278
279 return 0;
280}
281
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293
294
295static inline int gpio_to_pin(struct pinctrl_gpio_range *range,
296 unsigned int gpio)
297{
298 unsigned int offset = gpio - range->base;
299 if (range->pins)
300 return range->pins[offset];
301 else
302 return range->pin_base + offset;
303}
304
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310
311
312
313static struct pinctrl_gpio_range *
314pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio)
315{
316 struct pinctrl_gpio_range *range = NULL;
317
318 mutex_lock(&pctldev->mutex);
319
320 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
321
322 if (gpio >= range->base &&
323 gpio < range->base + range->npins) {
324 mutex_unlock(&pctldev->mutex);
325 return range;
326 }
327 }
328 mutex_unlock(&pctldev->mutex);
329 return NULL;
330}
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343
344
345#ifdef CONFIG_GPIOLIB
346static bool pinctrl_ready_for_gpio_range(unsigned gpio)
347{
348 struct pinctrl_dev *pctldev;
349 struct pinctrl_gpio_range *range = NULL;
350 struct gpio_chip *chip = gpio_to_chip(gpio);
351
352 if (WARN(!chip, "no gpio_chip for gpio%i?", gpio))
353 return false;
354
355 mutex_lock(&pinctrldev_list_mutex);
356
357
358 list_for_each_entry(pctldev, &pinctrldev_list, node) {
359
360 mutex_lock(&pctldev->mutex);
361 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
362
363 if (range->base + range->npins - 1 < chip->base ||
364 range->base > chip->base + chip->ngpio - 1)
365 continue;
366 mutex_unlock(&pctldev->mutex);
367 mutex_unlock(&pinctrldev_list_mutex);
368 return true;
369 }
370 mutex_unlock(&pctldev->mutex);
371 }
372
373 mutex_unlock(&pinctrldev_list_mutex);
374
375 return false;
376}
377#else
378static bool pinctrl_ready_for_gpio_range(unsigned gpio) { return true; }
379#endif
380
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390
391
392static int pinctrl_get_device_gpio_range(unsigned gpio,
393 struct pinctrl_dev **outdev,
394 struct pinctrl_gpio_range **outrange)
395{
396 struct pinctrl_dev *pctldev = NULL;
397
398 mutex_lock(&pinctrldev_list_mutex);
399
400
401 list_for_each_entry(pctldev, &pinctrldev_list, node) {
402 struct pinctrl_gpio_range *range;
403
404 range = pinctrl_match_gpio_range(pctldev, gpio);
405 if (range) {
406 *outdev = pctldev;
407 *outrange = range;
408 mutex_unlock(&pinctrldev_list_mutex);
409 return 0;
410 }
411 }
412
413 mutex_unlock(&pinctrldev_list_mutex);
414
415 return -EPROBE_DEFER;
416}
417
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423
424
425
426void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
427 struct pinctrl_gpio_range *range)
428{
429 mutex_lock(&pctldev->mutex);
430 list_add_tail(&range->node, &pctldev->gpio_ranges);
431 mutex_unlock(&pctldev->mutex);
432}
433EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
434
435void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
436 struct pinctrl_gpio_range *ranges,
437 unsigned nranges)
438{
439 int i;
440
441 for (i = 0; i < nranges; i++)
442 pinctrl_add_gpio_range(pctldev, &ranges[i]);
443}
444EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges);
445
446struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
447 struct pinctrl_gpio_range *range)
448{
449 struct pinctrl_dev *pctldev;
450
451 pctldev = get_pinctrl_dev_from_devname(devname);
452
453
454
455
456
457
458 if (!pctldev) {
459 return ERR_PTR(-EPROBE_DEFER);
460 }
461 pinctrl_add_gpio_range(pctldev, range);
462
463 return pctldev;
464}
465EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range);
466
467int pinctrl_get_group_pins(struct pinctrl_dev *pctldev, const char *pin_group,
468 const unsigned **pins, unsigned *num_pins)
469{
470 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
471 int gs;
472
473 if (!pctlops->get_group_pins)
474 return -EINVAL;
475
476 gs = pinctrl_get_group_selector(pctldev, pin_group);
477 if (gs < 0)
478 return gs;
479
480 return pctlops->get_group_pins(pctldev, gs, pins, num_pins);
481}
482EXPORT_SYMBOL_GPL(pinctrl_get_group_pins);
483
484struct pinctrl_gpio_range *
485pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev,
486 unsigned int pin)
487{
488 struct pinctrl_gpio_range *range;
489
490
491 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
492
493 if (range->pins) {
494 int a;
495 for (a = 0; a < range->npins; a++) {
496 if (range->pins[a] == pin)
497 return range;
498 }
499 } else if (pin >= range->pin_base &&
500 pin < range->pin_base + range->npins)
501 return range;
502 }
503
504 return NULL;
505}
506EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin_nolock);
507
508
509
510
511
512
513struct pinctrl_gpio_range *
514pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
515 unsigned int pin)
516{
517 struct pinctrl_gpio_range *range;
518
519 mutex_lock(&pctldev->mutex);
520 range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin);
521 mutex_unlock(&pctldev->mutex);
522
523 return range;
524}
525EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin);
526
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530
531
532void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
533 struct pinctrl_gpio_range *range)
534{
535 mutex_lock(&pctldev->mutex);
536 list_del(&range->node);
537 mutex_unlock(&pctldev->mutex);
538}
539EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range);
540
541#ifdef CONFIG_GENERIC_PINCTRL_GROUPS
542
543
544
545
546
547int pinctrl_generic_get_group_count(struct pinctrl_dev *pctldev)
548{
549 return pctldev->num_groups;
550}
551EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_count);
552
553
554
555
556
557
558const char *pinctrl_generic_get_group_name(struct pinctrl_dev *pctldev,
559 unsigned int selector)
560{
561 struct group_desc *group;
562
563 group = radix_tree_lookup(&pctldev->pin_group_tree,
564 selector);
565 if (!group)
566 return NULL;
567
568 return group->name;
569}
570EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_name);
571
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576
577
578
579int pinctrl_generic_get_group_pins(struct pinctrl_dev *pctldev,
580 unsigned int selector,
581 const unsigned int **pins,
582 unsigned int *num_pins)
583{
584 struct group_desc *group;
585
586 group = radix_tree_lookup(&pctldev->pin_group_tree,
587 selector);
588 if (!group) {
589 dev_err(pctldev->dev, "%s could not find pingroup%i\n",
590 __func__, selector);
591 return -EINVAL;
592 }
593
594 *pins = group->pins;
595 *num_pins = group->num_pins;
596
597 return 0;
598}
599EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_pins);
600
601
602
603
604
605
606struct group_desc *pinctrl_generic_get_group(struct pinctrl_dev *pctldev,
607 unsigned int selector)
608{
609 struct group_desc *group;
610
611 group = radix_tree_lookup(&pctldev->pin_group_tree,
612 selector);
613 if (!group)
614 return NULL;
615
616 return group;
617}
618EXPORT_SYMBOL_GPL(pinctrl_generic_get_group);
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628
629
630int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name,
631 int *pins, int num_pins, void *data)
632{
633 struct group_desc *group;
634
635 group = devm_kzalloc(pctldev->dev, sizeof(*group), GFP_KERNEL);
636 if (!group)
637 return -ENOMEM;
638
639 group->name = name;
640 group->pins = pins;
641 group->num_pins = num_pins;
642 group->data = data;
643
644 radix_tree_insert(&pctldev->pin_group_tree, pctldev->num_groups,
645 group);
646
647 pctldev->num_groups++;
648
649 return 0;
650}
651EXPORT_SYMBOL_GPL(pinctrl_generic_add_group);
652
653
654
655
656
657
658
659
660int pinctrl_generic_remove_group(struct pinctrl_dev *pctldev,
661 unsigned int selector)
662{
663 struct group_desc *group;
664
665 group = radix_tree_lookup(&pctldev->pin_group_tree,
666 selector);
667 if (!group)
668 return -ENOENT;
669
670 radix_tree_delete(&pctldev->pin_group_tree, selector);
671 devm_kfree(pctldev->dev, group);
672
673 pctldev->num_groups--;
674
675 return 0;
676}
677EXPORT_SYMBOL_GPL(pinctrl_generic_remove_group);
678
679
680
681
682
683
684
685
686static void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev)
687{
688 struct radix_tree_iter iter;
689 void **slot;
690
691 radix_tree_for_each_slot(slot, &pctldev->pin_group_tree, &iter, 0)
692 radix_tree_delete(&pctldev->pin_group_tree, iter.index);
693
694 pctldev->num_groups = 0;
695}
696
697#else
698static inline void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev)
699{
700}
701#endif
702
703
704
705
706
707
708int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
709 const char *pin_group)
710{
711 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
712 unsigned ngroups = pctlops->get_groups_count(pctldev);
713 unsigned group_selector = 0;
714
715 while (group_selector < ngroups) {
716 const char *gname = pctlops->get_group_name(pctldev,
717 group_selector);
718 if (!strcmp(gname, pin_group)) {
719 dev_dbg(pctldev->dev,
720 "found group selector %u for %s\n",
721 group_selector,
722 pin_group);
723 return group_selector;
724 }
725
726 group_selector++;
727 }
728
729 dev_err(pctldev->dev, "does not have pin group %s\n",
730 pin_group);
731
732 return -EINVAL;
733}
734
735
736
737
738
739
740
741
742
743int pinctrl_request_gpio(unsigned gpio)
744{
745 struct pinctrl_dev *pctldev;
746 struct pinctrl_gpio_range *range;
747 int ret;
748 int pin;
749
750 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
751 if (ret) {
752 if (pinctrl_ready_for_gpio_range(gpio))
753 ret = 0;
754 return ret;
755 }
756
757 mutex_lock(&pctldev->mutex);
758
759
760 pin = gpio_to_pin(range, gpio);
761
762 ret = pinmux_request_gpio(pctldev, range, pin, gpio);
763
764 mutex_unlock(&pctldev->mutex);
765
766 return ret;
767}
768EXPORT_SYMBOL_GPL(pinctrl_request_gpio);
769
770
771
772
773
774
775
776
777
778void pinctrl_free_gpio(unsigned gpio)
779{
780 struct pinctrl_dev *pctldev;
781 struct pinctrl_gpio_range *range;
782 int ret;
783 int pin;
784
785 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
786 if (ret) {
787 return;
788 }
789 mutex_lock(&pctldev->mutex);
790
791
792 pin = gpio_to_pin(range, gpio);
793
794 pinmux_free_gpio(pctldev, pin, range);
795
796 mutex_unlock(&pctldev->mutex);
797}
798EXPORT_SYMBOL_GPL(pinctrl_free_gpio);
799
800static int pinctrl_gpio_direction(unsigned gpio, bool input)
801{
802 struct pinctrl_dev *pctldev;
803 struct pinctrl_gpio_range *range;
804 int ret;
805 int pin;
806
807 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
808 if (ret) {
809 return ret;
810 }
811
812 mutex_lock(&pctldev->mutex);
813
814
815 pin = gpio_to_pin(range, gpio);
816 ret = pinmux_gpio_direction(pctldev, range, pin, input);
817
818 mutex_unlock(&pctldev->mutex);
819
820 return ret;
821}
822
823
824
825
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827
828
829
830
831int pinctrl_gpio_direction_input(unsigned gpio)
832{
833 return pinctrl_gpio_direction(gpio, true);
834}
835EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
836
837
838
839
840
841
842
843
844
845int pinctrl_gpio_direction_output(unsigned gpio)
846{
847 return pinctrl_gpio_direction(gpio, false);
848}
849EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
850
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858
859
860int pinctrl_gpio_set_config(unsigned gpio, unsigned long config)
861{
862 unsigned long configs[] = { config };
863 struct pinctrl_gpio_range *range;
864 struct pinctrl_dev *pctldev;
865 int ret, pin;
866
867 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
868 if (ret)
869 return ret;
870
871 mutex_lock(&pctldev->mutex);
872 pin = gpio_to_pin(range, gpio);
873 ret = pinconf_set_config(pctldev, pin, configs, ARRAY_SIZE(configs));
874 mutex_unlock(&pctldev->mutex);
875
876 return ret;
877}
878EXPORT_SYMBOL_GPL(pinctrl_gpio_set_config);
879
880static struct pinctrl_state *find_state(struct pinctrl *p,
881 const char *name)
882{
883 struct pinctrl_state *state;
884
885 list_for_each_entry(state, &p->states, node)
886 if (!strcmp(state->name, name))
887 return state;
888
889 return NULL;
890}
891
892static struct pinctrl_state *create_state(struct pinctrl *p,
893 const char *name)
894{
895 struct pinctrl_state *state;
896
897 state = kzalloc(sizeof(*state), GFP_KERNEL);
898 if (!state)
899 return ERR_PTR(-ENOMEM);
900
901 state->name = name;
902 INIT_LIST_HEAD(&state->settings);
903
904 list_add_tail(&state->node, &p->states);
905
906 return state;
907}
908
909static int add_setting(struct pinctrl *p, struct pinctrl_dev *pctldev,
910 struct pinctrl_map const *map)
911{
912 struct pinctrl_state *state;
913 struct pinctrl_setting *setting;
914 int ret;
915
916 state = find_state(p, map->name);
917 if (!state)
918 state = create_state(p, map->name);
919 if (IS_ERR(state))
920 return PTR_ERR(state);
921
922 if (map->type == PIN_MAP_TYPE_DUMMY_STATE)
923 return 0;
924
925 setting = kzalloc(sizeof(*setting), GFP_KERNEL);
926 if (!setting)
927 return -ENOMEM;
928
929 setting->type = map->type;
930
931 if (pctldev)
932 setting->pctldev = pctldev;
933 else
934 setting->pctldev =
935 get_pinctrl_dev_from_devname(map->ctrl_dev_name);
936 if (!setting->pctldev) {
937 kfree(setting);
938
939 if (!strcmp(map->ctrl_dev_name, map->dev_name))
940 return -ENODEV;
941
942
943
944
945 dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe",
946 map->ctrl_dev_name);
947 return -EPROBE_DEFER;
948 }
949
950 setting->dev_name = map->dev_name;
951
952 switch (map->type) {
953 case PIN_MAP_TYPE_MUX_GROUP:
954 ret = pinmux_map_to_setting(map, setting);
955 break;
956 case PIN_MAP_TYPE_CONFIGS_PIN:
957 case PIN_MAP_TYPE_CONFIGS_GROUP:
958 ret = pinconf_map_to_setting(map, setting);
959 break;
960 default:
961 ret = -EINVAL;
962 break;
963 }
964 if (ret < 0) {
965 kfree(setting);
966 return ret;
967 }
968
969 list_add_tail(&setting->node, &state->settings);
970
971 return 0;
972}
973
974static struct pinctrl *find_pinctrl(struct device *dev)
975{
976 struct pinctrl *p;
977
978 mutex_lock(&pinctrl_list_mutex);
979 list_for_each_entry(p, &pinctrl_list, node)
980 if (p->dev == dev) {
981 mutex_unlock(&pinctrl_list_mutex);
982 return p;
983 }
984
985 mutex_unlock(&pinctrl_list_mutex);
986 return NULL;
987}
988
989static void pinctrl_free(struct pinctrl *p, bool inlist);
990
991static struct pinctrl *create_pinctrl(struct device *dev,
992 struct pinctrl_dev *pctldev)
993{
994 struct pinctrl *p;
995 const char *devname;
996 struct pinctrl_maps *maps_node;
997 int i;
998 struct pinctrl_map const *map;
999 int ret;
1000
1001
1002
1003
1004
1005
1006 p = kzalloc(sizeof(*p), GFP_KERNEL);
1007 if (!p)
1008 return ERR_PTR(-ENOMEM);
1009 p->dev = dev;
1010 INIT_LIST_HEAD(&p->states);
1011 INIT_LIST_HEAD(&p->dt_maps);
1012
1013 ret = pinctrl_dt_to_map(p, pctldev);
1014 if (ret < 0) {
1015 kfree(p);
1016 return ERR_PTR(ret);
1017 }
1018
1019 devname = dev_name(dev);
1020
1021 mutex_lock(&pinctrl_maps_mutex);
1022
1023 for_each_maps(maps_node, i, map) {
1024
1025 if (strcmp(map->dev_name, devname))
1026 continue;
1027
1028
1029
1030
1031
1032
1033
1034 if (pctldev &&
1035 strcmp(dev_name(pctldev->dev), map->ctrl_dev_name))
1036 continue;
1037
1038 ret = add_setting(p, pctldev, map);
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052 if (ret == -EPROBE_DEFER) {
1053 pinctrl_free(p, false);
1054 mutex_unlock(&pinctrl_maps_mutex);
1055 return ERR_PTR(ret);
1056 }
1057 }
1058 mutex_unlock(&pinctrl_maps_mutex);
1059
1060 if (ret < 0) {
1061
1062 pinctrl_free(p, false);
1063 return ERR_PTR(ret);
1064 }
1065
1066 kref_init(&p->users);
1067
1068
1069 mutex_lock(&pinctrl_list_mutex);
1070 list_add_tail(&p->node, &pinctrl_list);
1071 mutex_unlock(&pinctrl_list_mutex);
1072
1073 return p;
1074}
1075
1076
1077
1078
1079
1080struct pinctrl *pinctrl_get(struct device *dev)
1081{
1082 struct pinctrl *p;
1083
1084 if (WARN_ON(!dev))
1085 return ERR_PTR(-EINVAL);
1086
1087
1088
1089
1090
1091
1092 p = find_pinctrl(dev);
1093 if (p) {
1094 dev_dbg(dev, "obtain a copy of previously claimed pinctrl\n");
1095 kref_get(&p->users);
1096 return p;
1097 }
1098
1099 return create_pinctrl(dev, NULL);
1100}
1101EXPORT_SYMBOL_GPL(pinctrl_get);
1102
1103static void pinctrl_free_setting(bool disable_setting,
1104 struct pinctrl_setting *setting)
1105{
1106 switch (setting->type) {
1107 case PIN_MAP_TYPE_MUX_GROUP:
1108 if (disable_setting)
1109 pinmux_disable_setting(setting);
1110 pinmux_free_setting(setting);
1111 break;
1112 case PIN_MAP_TYPE_CONFIGS_PIN:
1113 case PIN_MAP_TYPE_CONFIGS_GROUP:
1114 pinconf_free_setting(setting);
1115 break;
1116 default:
1117 break;
1118 }
1119}
1120
1121static void pinctrl_free(struct pinctrl *p, bool inlist)
1122{
1123 struct pinctrl_state *state, *n1;
1124 struct pinctrl_setting *setting, *n2;
1125
1126 mutex_lock(&pinctrl_list_mutex);
1127 list_for_each_entry_safe(state, n1, &p->states, node) {
1128 list_for_each_entry_safe(setting, n2, &state->settings, node) {
1129 pinctrl_free_setting(state == p->state, setting);
1130 list_del(&setting->node);
1131 kfree(setting);
1132 }
1133 list_del(&state->node);
1134 kfree(state);
1135 }
1136
1137 pinctrl_dt_free_maps(p);
1138
1139 if (inlist)
1140 list_del(&p->node);
1141 kfree(p);
1142 mutex_unlock(&pinctrl_list_mutex);
1143}
1144
1145
1146
1147
1148
1149static void pinctrl_release(struct kref *kref)
1150{
1151 struct pinctrl *p = container_of(kref, struct pinctrl, users);
1152
1153 pinctrl_free(p, true);
1154}
1155
1156
1157
1158
1159
1160void pinctrl_put(struct pinctrl *p)
1161{
1162 kref_put(&p->users, pinctrl_release);
1163}
1164EXPORT_SYMBOL_GPL(pinctrl_put);
1165
1166
1167
1168
1169
1170
1171struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p,
1172 const char *name)
1173{
1174 struct pinctrl_state *state;
1175
1176 state = find_state(p, name);
1177 if (!state) {
1178 if (pinctrl_dummy_state) {
1179
1180 dev_dbg(p->dev, "using pinctrl dummy state (%s)\n",
1181 name);
1182 state = create_state(p, name);
1183 } else
1184 state = ERR_PTR(-ENODEV);
1185 }
1186
1187 return state;
1188}
1189EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
1190
1191
1192
1193
1194
1195
1196int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
1197{
1198 struct pinctrl_setting *setting, *setting2;
1199 struct pinctrl_state *old_state = p->state;
1200 int ret;
1201
1202 if (p->state == state)
1203 return 0;
1204
1205 if (p->state) {
1206
1207
1208
1209
1210
1211
1212 list_for_each_entry(setting, &p->state->settings, node) {
1213 if (setting->type != PIN_MAP_TYPE_MUX_GROUP)
1214 continue;
1215 pinmux_disable_setting(setting);
1216 }
1217 }
1218
1219 p->state = NULL;
1220
1221
1222 list_for_each_entry(setting, &state->settings, node) {
1223 switch (setting->type) {
1224 case PIN_MAP_TYPE_MUX_GROUP:
1225 ret = pinmux_enable_setting(setting);
1226 break;
1227 case PIN_MAP_TYPE_CONFIGS_PIN:
1228 case PIN_MAP_TYPE_CONFIGS_GROUP:
1229 ret = pinconf_apply_setting(setting);
1230 break;
1231 default:
1232 ret = -EINVAL;
1233 break;
1234 }
1235
1236 if (ret < 0) {
1237 goto unapply_new_state;
1238 }
1239 }
1240
1241 p->state = state;
1242
1243 return 0;
1244
1245unapply_new_state:
1246 dev_err(p->dev, "Error applying setting, reverse things back\n");
1247
1248 list_for_each_entry(setting2, &state->settings, node) {
1249 if (&setting2->node == &setting->node)
1250 break;
1251
1252
1253
1254
1255
1256
1257
1258 if (setting2->type == PIN_MAP_TYPE_MUX_GROUP)
1259 pinmux_disable_setting(setting2);
1260 }
1261
1262
1263 if (old_state)
1264 pinctrl_select_state(p, old_state);
1265
1266 return ret;
1267}
1268EXPORT_SYMBOL_GPL(pinctrl_select_state);
1269
1270static void devm_pinctrl_release(struct device *dev, void *res)
1271{
1272 pinctrl_put(*(struct pinctrl **)res);
1273}
1274
1275
1276
1277
1278
1279
1280
1281
1282struct pinctrl *devm_pinctrl_get(struct device *dev)
1283{
1284 struct pinctrl **ptr, *p;
1285
1286 ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL);
1287 if (!ptr)
1288 return ERR_PTR(-ENOMEM);
1289
1290 p = pinctrl_get(dev);
1291 if (!IS_ERR(p)) {
1292 *ptr = p;
1293 devres_add(dev, ptr);
1294 } else {
1295 devres_free(ptr);
1296 }
1297
1298 return p;
1299}
1300EXPORT_SYMBOL_GPL(devm_pinctrl_get);
1301
1302static int devm_pinctrl_match(struct device *dev, void *res, void *data)
1303{
1304 struct pinctrl **p = res;
1305
1306 return *p == data;
1307}
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317void devm_pinctrl_put(struct pinctrl *p)
1318{
1319 WARN_ON(devres_release(p->dev, devm_pinctrl_release,
1320 devm_pinctrl_match, p));
1321}
1322EXPORT_SYMBOL_GPL(devm_pinctrl_put);
1323
1324int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps,
1325 bool dup)
1326{
1327 int i, ret;
1328 struct pinctrl_maps *maps_node;
1329
1330 pr_debug("add %u pinctrl maps\n", num_maps);
1331
1332
1333 for (i = 0; i < num_maps; i++) {
1334 if (!maps[i].dev_name) {
1335 pr_err("failed to register map %s (%d): no device given\n",
1336 maps[i].name, i);
1337 return -EINVAL;
1338 }
1339
1340 if (!maps[i].name) {
1341 pr_err("failed to register map %d: no map name given\n",
1342 i);
1343 return -EINVAL;
1344 }
1345
1346 if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE &&
1347 !maps[i].ctrl_dev_name) {
1348 pr_err("failed to register map %s (%d): no pin control device given\n",
1349 maps[i].name, i);
1350 return -EINVAL;
1351 }
1352
1353 switch (maps[i].type) {
1354 case PIN_MAP_TYPE_DUMMY_STATE:
1355 break;
1356 case PIN_MAP_TYPE_MUX_GROUP:
1357 ret = pinmux_validate_map(&maps[i], i);
1358 if (ret < 0)
1359 return ret;
1360 break;
1361 case PIN_MAP_TYPE_CONFIGS_PIN:
1362 case PIN_MAP_TYPE_CONFIGS_GROUP:
1363 ret = pinconf_validate_map(&maps[i], i);
1364 if (ret < 0)
1365 return ret;
1366 break;
1367 default:
1368 pr_err("failed to register map %s (%d): invalid type given\n",
1369 maps[i].name, i);
1370 return -EINVAL;
1371 }
1372 }
1373
1374 maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL);
1375 if (!maps_node)
1376 return -ENOMEM;
1377
1378 maps_node->num_maps = num_maps;
1379 if (dup) {
1380 maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps,
1381 GFP_KERNEL);
1382 if (!maps_node->maps) {
1383 pr_err("failed to duplicate mapping table\n");
1384 kfree(maps_node);
1385 return -ENOMEM;
1386 }
1387 } else {
1388 maps_node->maps = maps;
1389 }
1390
1391 mutex_lock(&pinctrl_maps_mutex);
1392 list_add_tail(&maps_node->node, &pinctrl_maps);
1393 mutex_unlock(&pinctrl_maps_mutex);
1394
1395 return 0;
1396}
1397
1398
1399
1400
1401
1402
1403
1404
1405int pinctrl_register_mappings(struct pinctrl_map const *maps,
1406 unsigned num_maps)
1407{
1408 return pinctrl_register_map(maps, num_maps, true);
1409}
1410
1411void pinctrl_unregister_map(struct pinctrl_map const *map)
1412{
1413 struct pinctrl_maps *maps_node;
1414
1415 mutex_lock(&pinctrl_maps_mutex);
1416 list_for_each_entry(maps_node, &pinctrl_maps, node) {
1417 if (maps_node->maps == map) {
1418 list_del(&maps_node->node);
1419 kfree(maps_node);
1420 mutex_unlock(&pinctrl_maps_mutex);
1421 return;
1422 }
1423 }
1424 mutex_unlock(&pinctrl_maps_mutex);
1425}
1426
1427
1428
1429
1430
1431int pinctrl_force_sleep(struct pinctrl_dev *pctldev)
1432{
1433 if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_sleep))
1434 return pinctrl_select_state(pctldev->p, pctldev->hog_sleep);
1435 return 0;
1436}
1437EXPORT_SYMBOL_GPL(pinctrl_force_sleep);
1438
1439
1440
1441
1442
1443int pinctrl_force_default(struct pinctrl_dev *pctldev)
1444{
1445 if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_default))
1446 return pinctrl_select_state(pctldev->p, pctldev->hog_default);
1447 return 0;
1448}
1449EXPORT_SYMBOL_GPL(pinctrl_force_default);
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459int pinctrl_init_done(struct device *dev)
1460{
1461 struct dev_pin_info *pins = dev->pins;
1462 int ret;
1463
1464 if (!pins)
1465 return 0;
1466
1467 if (IS_ERR(pins->init_state))
1468 return 0;
1469
1470 if (pins->p->state != pins->init_state)
1471 return 0;
1472
1473 if (IS_ERR(pins->default_state))
1474 return 0;
1475
1476 ret = pinctrl_select_state(pins->p, pins->default_state);
1477 if (ret)
1478 dev_err(dev, "failed to activate default pinctrl state\n");
1479
1480 return ret;
1481}
1482
1483#ifdef CONFIG_PM
1484
1485
1486
1487
1488
1489
1490static int pinctrl_pm_select_state(struct device *dev,
1491 struct pinctrl_state *state)
1492{
1493 struct dev_pin_info *pins = dev->pins;
1494 int ret;
1495
1496 if (IS_ERR(state))
1497 return 0;
1498 ret = pinctrl_select_state(pins->p, state);
1499 if (ret)
1500 dev_err(dev, "failed to activate pinctrl state %s\n",
1501 state->name);
1502 return ret;
1503}
1504
1505
1506
1507
1508
1509int pinctrl_pm_select_default_state(struct device *dev)
1510{
1511 if (!dev->pins)
1512 return 0;
1513
1514 return pinctrl_pm_select_state(dev, dev->pins->default_state);
1515}
1516EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state);
1517
1518
1519
1520
1521
1522int pinctrl_pm_select_sleep_state(struct device *dev)
1523{
1524 if (!dev->pins)
1525 return 0;
1526
1527 return pinctrl_pm_select_state(dev, dev->pins->sleep_state);
1528}
1529EXPORT_SYMBOL_GPL(pinctrl_pm_select_sleep_state);
1530
1531
1532
1533
1534
1535int pinctrl_pm_select_idle_state(struct device *dev)
1536{
1537 if (!dev->pins)
1538 return 0;
1539
1540 return pinctrl_pm_select_state(dev, dev->pins->idle_state);
1541}
1542EXPORT_SYMBOL_GPL(pinctrl_pm_select_idle_state);
1543#endif
1544
1545#ifdef CONFIG_DEBUG_FS
1546
1547static int pinctrl_pins_show(struct seq_file *s, void *what)
1548{
1549 struct pinctrl_dev *pctldev = s->private;
1550 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1551 unsigned i, pin;
1552
1553 seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);
1554
1555 mutex_lock(&pctldev->mutex);
1556
1557
1558 for (i = 0; i < pctldev->desc->npins; i++) {
1559 struct pin_desc *desc;
1560
1561 pin = pctldev->desc->pins[i].number;
1562 desc = pin_desc_get(pctldev, pin);
1563
1564 if (!desc)
1565 continue;
1566
1567 seq_printf(s, "pin %d (%s) ", pin, desc->name);
1568
1569
1570 if (ops->pin_dbg_show)
1571 ops->pin_dbg_show(pctldev, s, pin);
1572
1573 seq_puts(s, "\n");
1574 }
1575
1576 mutex_unlock(&pctldev->mutex);
1577
1578 return 0;
1579}
1580
1581static int pinctrl_groups_show(struct seq_file *s, void *what)
1582{
1583 struct pinctrl_dev *pctldev = s->private;
1584 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1585 unsigned ngroups, selector = 0;
1586
1587 mutex_lock(&pctldev->mutex);
1588
1589 ngroups = ops->get_groups_count(pctldev);
1590
1591 seq_puts(s, "registered pin groups:\n");
1592 while (selector < ngroups) {
1593 const unsigned *pins = NULL;
1594 unsigned num_pins = 0;
1595 const char *gname = ops->get_group_name(pctldev, selector);
1596 const char *pname;
1597 int ret = 0;
1598 int i;
1599
1600 if (ops->get_group_pins)
1601 ret = ops->get_group_pins(pctldev, selector,
1602 &pins, &num_pins);
1603 if (ret)
1604 seq_printf(s, "%s [ERROR GETTING PINS]\n",
1605 gname);
1606 else {
1607 seq_printf(s, "group: %s\n", gname);
1608 for (i = 0; i < num_pins; i++) {
1609 pname = pin_get_name(pctldev, pins[i]);
1610 if (WARN_ON(!pname)) {
1611 mutex_unlock(&pctldev->mutex);
1612 return -EINVAL;
1613 }
1614 seq_printf(s, "pin %d (%s)\n", pins[i], pname);
1615 }
1616 seq_puts(s, "\n");
1617 }
1618 selector++;
1619 }
1620
1621 mutex_unlock(&pctldev->mutex);
1622
1623 return 0;
1624}
1625
1626static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
1627{
1628 struct pinctrl_dev *pctldev = s->private;
1629 struct pinctrl_gpio_range *range = NULL;
1630
1631 seq_puts(s, "GPIO ranges handled:\n");
1632
1633 mutex_lock(&pctldev->mutex);
1634
1635
1636 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
1637 if (range->pins) {
1638 int a;
1639 seq_printf(s, "%u: %s GPIOS [%u - %u] PINS {",
1640 range->id, range->name,
1641 range->base, (range->base + range->npins - 1));
1642 for (a = 0; a < range->npins - 1; a++)
1643 seq_printf(s, "%u, ", range->pins[a]);
1644 seq_printf(s, "%u}\n", range->pins[a]);
1645 }
1646 else
1647 seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
1648 range->id, range->name,
1649 range->base, (range->base + range->npins - 1),
1650 range->pin_base,
1651 (range->pin_base + range->npins - 1));
1652 }
1653
1654 mutex_unlock(&pctldev->mutex);
1655
1656 return 0;
1657}
1658
1659static int pinctrl_devices_show(struct seq_file *s, void *what)
1660{
1661 struct pinctrl_dev *pctldev;
1662
1663 seq_puts(s, "name [pinmux] [pinconf]\n");
1664
1665 mutex_lock(&pinctrldev_list_mutex);
1666
1667 list_for_each_entry(pctldev, &pinctrldev_list, node) {
1668 seq_printf(s, "%s ", pctldev->desc->name);
1669 if (pctldev->desc->pmxops)
1670 seq_puts(s, "yes ");
1671 else
1672 seq_puts(s, "no ");
1673 if (pctldev->desc->confops)
1674 seq_puts(s, "yes");
1675 else
1676 seq_puts(s, "no");
1677 seq_puts(s, "\n");
1678 }
1679
1680 mutex_unlock(&pinctrldev_list_mutex);
1681
1682 return 0;
1683}
1684
1685static inline const char *map_type(enum pinctrl_map_type type)
1686{
1687 static const char * const names[] = {
1688 "INVALID",
1689 "DUMMY_STATE",
1690 "MUX_GROUP",
1691 "CONFIGS_PIN",
1692 "CONFIGS_GROUP",
1693 };
1694
1695 if (type >= ARRAY_SIZE(names))
1696 return "UNKNOWN";
1697
1698 return names[type];
1699}
1700
1701static int pinctrl_maps_show(struct seq_file *s, void *what)
1702{
1703 struct pinctrl_maps *maps_node;
1704 int i;
1705 struct pinctrl_map const *map;
1706
1707 seq_puts(s, "Pinctrl maps:\n");
1708
1709 mutex_lock(&pinctrl_maps_mutex);
1710 for_each_maps(maps_node, i, map) {
1711 seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n",
1712 map->dev_name, map->name, map_type(map->type),
1713 map->type);
1714
1715 if (map->type != PIN_MAP_TYPE_DUMMY_STATE)
1716 seq_printf(s, "controlling device %s\n",
1717 map->ctrl_dev_name);
1718
1719 switch (map->type) {
1720 case PIN_MAP_TYPE_MUX_GROUP:
1721 pinmux_show_map(s, map);
1722 break;
1723 case PIN_MAP_TYPE_CONFIGS_PIN:
1724 case PIN_MAP_TYPE_CONFIGS_GROUP:
1725 pinconf_show_map(s, map);
1726 break;
1727 default:
1728 break;
1729 }
1730
1731 seq_putc(s, '\n');
1732 }
1733 mutex_unlock(&pinctrl_maps_mutex);
1734
1735 return 0;
1736}
1737
1738static int pinctrl_show(struct seq_file *s, void *what)
1739{
1740 struct pinctrl *p;
1741 struct pinctrl_state *state;
1742 struct pinctrl_setting *setting;
1743
1744 seq_puts(s, "Requested pin control handlers their pinmux maps:\n");
1745
1746 mutex_lock(&pinctrl_list_mutex);
1747
1748 list_for_each_entry(p, &pinctrl_list, node) {
1749 seq_printf(s, "device: %s current state: %s\n",
1750 dev_name(p->dev),
1751 p->state ? p->state->name : "none");
1752
1753 list_for_each_entry(state, &p->states, node) {
1754 seq_printf(s, " state: %s\n", state->name);
1755
1756 list_for_each_entry(setting, &state->settings, node) {
1757 struct pinctrl_dev *pctldev = setting->pctldev;
1758
1759 seq_printf(s, " type: %s controller %s ",
1760 map_type(setting->type),
1761 pinctrl_dev_get_name(pctldev));
1762
1763 switch (setting->type) {
1764 case PIN_MAP_TYPE_MUX_GROUP:
1765 pinmux_show_setting(s, setting);
1766 break;
1767 case PIN_MAP_TYPE_CONFIGS_PIN:
1768 case PIN_MAP_TYPE_CONFIGS_GROUP:
1769 pinconf_show_setting(s, setting);
1770 break;
1771 default:
1772 break;
1773 }
1774 }
1775 }
1776 }
1777
1778 mutex_unlock(&pinctrl_list_mutex);
1779
1780 return 0;
1781}
1782
1783static int pinctrl_pins_open(struct inode *inode, struct file *file)
1784{
1785 return single_open(file, pinctrl_pins_show, inode->i_private);
1786}
1787
1788static int pinctrl_groups_open(struct inode *inode, struct file *file)
1789{
1790 return single_open(file, pinctrl_groups_show, inode->i_private);
1791}
1792
1793static int pinctrl_gpioranges_open(struct inode *inode, struct file *file)
1794{
1795 return single_open(file, pinctrl_gpioranges_show, inode->i_private);
1796}
1797
1798static int pinctrl_devices_open(struct inode *inode, struct file *file)
1799{
1800 return single_open(file, pinctrl_devices_show, NULL);
1801}
1802
1803static int pinctrl_maps_open(struct inode *inode, struct file *file)
1804{
1805 return single_open(file, pinctrl_maps_show, NULL);
1806}
1807
1808static int pinctrl_open(struct inode *inode, struct file *file)
1809{
1810 return single_open(file, pinctrl_show, NULL);
1811}
1812
1813static const struct file_operations pinctrl_pins_ops = {
1814 .open = pinctrl_pins_open,
1815 .read = seq_read,
1816 .llseek = seq_lseek,
1817 .release = single_release,
1818};
1819
1820static const struct file_operations pinctrl_groups_ops = {
1821 .open = pinctrl_groups_open,
1822 .read = seq_read,
1823 .llseek = seq_lseek,
1824 .release = single_release,
1825};
1826
1827static const struct file_operations pinctrl_gpioranges_ops = {
1828 .open = pinctrl_gpioranges_open,
1829 .read = seq_read,
1830 .llseek = seq_lseek,
1831 .release = single_release,
1832};
1833
1834static const struct file_operations pinctrl_devices_ops = {
1835 .open = pinctrl_devices_open,
1836 .read = seq_read,
1837 .llseek = seq_lseek,
1838 .release = single_release,
1839};
1840
1841static const struct file_operations pinctrl_maps_ops = {
1842 .open = pinctrl_maps_open,
1843 .read = seq_read,
1844 .llseek = seq_lseek,
1845 .release = single_release,
1846};
1847
1848static const struct file_operations pinctrl_ops = {
1849 .open = pinctrl_open,
1850 .read = seq_read,
1851 .llseek = seq_lseek,
1852 .release = single_release,
1853};
1854
1855static struct dentry *debugfs_root;
1856
1857static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1858{
1859 struct dentry *device_root;
1860
1861 device_root = debugfs_create_dir(dev_name(pctldev->dev),
1862 debugfs_root);
1863 pctldev->device_root = device_root;
1864
1865 if (IS_ERR(device_root) || !device_root) {
1866 pr_warn("failed to create debugfs directory for %s\n",
1867 dev_name(pctldev->dev));
1868 return;
1869 }
1870 debugfs_create_file("pins", S_IFREG | S_IRUGO,
1871 device_root, pctldev, &pinctrl_pins_ops);
1872 debugfs_create_file("pingroups", S_IFREG | S_IRUGO,
1873 device_root, pctldev, &pinctrl_groups_ops);
1874 debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO,
1875 device_root, pctldev, &pinctrl_gpioranges_ops);
1876 if (pctldev->desc->pmxops)
1877 pinmux_init_device_debugfs(device_root, pctldev);
1878 if (pctldev->desc->confops)
1879 pinconf_init_device_debugfs(device_root, pctldev);
1880}
1881
1882static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1883{
1884 debugfs_remove_recursive(pctldev->device_root);
1885}
1886
1887static void pinctrl_init_debugfs(void)
1888{
1889 debugfs_root = debugfs_create_dir("pinctrl", NULL);
1890 if (IS_ERR(debugfs_root) || !debugfs_root) {
1891 pr_warn("failed to create debugfs directory\n");
1892 debugfs_root = NULL;
1893 return;
1894 }
1895
1896 debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO,
1897 debugfs_root, NULL, &pinctrl_devices_ops);
1898 debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO,
1899 debugfs_root, NULL, &pinctrl_maps_ops);
1900 debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO,
1901 debugfs_root, NULL, &pinctrl_ops);
1902}
1903
1904#else
1905
1906static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1907{
1908}
1909
1910static void pinctrl_init_debugfs(void)
1911{
1912}
1913
1914static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1915{
1916}
1917
1918#endif
1919
1920static int pinctrl_check_ops(struct pinctrl_dev *pctldev)
1921{
1922 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1923
1924 if (!ops ||
1925 !ops->get_groups_count ||
1926 !ops->get_group_name)
1927 return -EINVAL;
1928
1929 return 0;
1930}
1931
1932
1933
1934
1935
1936
1937
1938static struct pinctrl_dev *
1939pinctrl_init_controller(struct pinctrl_desc *pctldesc, struct device *dev,
1940 void *driver_data)
1941{
1942 struct pinctrl_dev *pctldev;
1943 int ret;
1944
1945 if (!pctldesc)
1946 return ERR_PTR(-EINVAL);
1947 if (!pctldesc->name)
1948 return ERR_PTR(-EINVAL);
1949
1950 pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL);
1951 if (!pctldev)
1952 return ERR_PTR(-ENOMEM);
1953
1954
1955 pctldev->owner = pctldesc->owner;
1956 pctldev->desc = pctldesc;
1957 pctldev->driver_data = driver_data;
1958 INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
1959#ifdef CONFIG_GENERIC_PINCTRL_GROUPS
1960 INIT_RADIX_TREE(&pctldev->pin_group_tree, GFP_KERNEL);
1961#endif
1962#ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS
1963 INIT_RADIX_TREE(&pctldev->pin_function_tree, GFP_KERNEL);
1964#endif
1965 INIT_LIST_HEAD(&pctldev->gpio_ranges);
1966 INIT_LIST_HEAD(&pctldev->node);
1967 pctldev->dev = dev;
1968 mutex_init(&pctldev->mutex);
1969
1970
1971 ret = pinctrl_check_ops(pctldev);
1972 if (ret) {
1973 dev_err(dev, "pinctrl ops lacks necessary functions\n");
1974 goto out_err;
1975 }
1976
1977
1978 if (pctldesc->pmxops) {
1979 ret = pinmux_check_ops(pctldev);
1980 if (ret)
1981 goto out_err;
1982 }
1983
1984
1985 if (pctldesc->confops) {
1986 ret = pinconf_check_ops(pctldev);
1987 if (ret)
1988 goto out_err;
1989 }
1990
1991
1992 dev_dbg(dev, "try to register %d pins ...\n", pctldesc->npins);
1993 ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins);
1994 if (ret) {
1995 dev_err(dev, "error during pin registration\n");
1996 pinctrl_free_pindescs(pctldev, pctldesc->pins,
1997 pctldesc->npins);
1998 goto out_err;
1999 }
2000
2001 return pctldev;
2002
2003out_err:
2004 mutex_destroy(&pctldev->mutex);
2005 kfree(pctldev);
2006 return ERR_PTR(ret);
2007}
2008
2009static int pinctrl_claim_hogs(struct pinctrl_dev *pctldev)
2010{
2011 pctldev->p = create_pinctrl(pctldev->dev, pctldev);
2012 if (PTR_ERR(pctldev->p) == -ENODEV) {
2013 dev_dbg(pctldev->dev, "no hogs found\n");
2014
2015 return 0;
2016 }
2017
2018 if (IS_ERR(pctldev->p)) {
2019 dev_err(pctldev->dev, "error claiming hogs: %li\n",
2020 PTR_ERR(pctldev->p));
2021
2022 return PTR_ERR(pctldev->p);
2023 }
2024
2025 kref_get(&pctldev->p->users);
2026 pctldev->hog_default =
2027 pinctrl_lookup_state(pctldev->p, PINCTRL_STATE_DEFAULT);
2028 if (IS_ERR(pctldev->hog_default)) {
2029 dev_dbg(pctldev->dev,
2030 "failed to lookup the default state\n");
2031 } else {
2032 if (pinctrl_select_state(pctldev->p,
2033 pctldev->hog_default))
2034 dev_err(pctldev->dev,
2035 "failed to select default state\n");
2036 }
2037
2038 pctldev->hog_sleep =
2039 pinctrl_lookup_state(pctldev->p,
2040 PINCTRL_STATE_SLEEP);
2041 if (IS_ERR(pctldev->hog_sleep))
2042 dev_dbg(pctldev->dev,
2043 "failed to lookup the sleep state\n");
2044
2045 return 0;
2046}
2047
2048int pinctrl_enable(struct pinctrl_dev *pctldev)
2049{
2050 int error;
2051
2052 error = pinctrl_claim_hogs(pctldev);
2053 if (error) {
2054 dev_err(pctldev->dev, "could not claim hogs: %i\n",
2055 error);
2056 mutex_destroy(&pctldev->mutex);
2057 kfree(pctldev);
2058
2059 return error;
2060 }
2061
2062 mutex_lock(&pinctrldev_list_mutex);
2063 list_add_tail(&pctldev->node, &pinctrldev_list);
2064 mutex_unlock(&pinctrldev_list_mutex);
2065
2066 pinctrl_init_device_debugfs(pctldev);
2067
2068 return 0;
2069}
2070EXPORT_SYMBOL_GPL(pinctrl_enable);
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
2084 struct device *dev, void *driver_data)
2085{
2086 struct pinctrl_dev *pctldev;
2087 int error;
2088
2089 pctldev = pinctrl_init_controller(pctldesc, dev, driver_data);
2090 if (IS_ERR(pctldev))
2091 return pctldev;
2092
2093 error = pinctrl_enable(pctldev);
2094 if (error)
2095 return ERR_PTR(error);
2096
2097 return pctldev;
2098
2099}
2100EXPORT_SYMBOL_GPL(pinctrl_register);
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112int pinctrl_register_and_init(struct pinctrl_desc *pctldesc,
2113 struct device *dev, void *driver_data,
2114 struct pinctrl_dev **pctldev)
2115{
2116 struct pinctrl_dev *p;
2117
2118 p = pinctrl_init_controller(pctldesc, dev, driver_data);
2119 if (IS_ERR(p))
2120 return PTR_ERR(p);
2121
2122
2123
2124
2125
2126
2127
2128 *pctldev = p;
2129
2130 return 0;
2131}
2132EXPORT_SYMBOL_GPL(pinctrl_register_and_init);
2133
2134
2135
2136
2137
2138
2139
2140void pinctrl_unregister(struct pinctrl_dev *pctldev)
2141{
2142 struct pinctrl_gpio_range *range, *n;
2143
2144 if (!pctldev)
2145 return;
2146
2147 mutex_lock(&pctldev->mutex);
2148 pinctrl_remove_device_debugfs(pctldev);
2149 mutex_unlock(&pctldev->mutex);
2150
2151 if (!IS_ERR_OR_NULL(pctldev->p))
2152 pinctrl_put(pctldev->p);
2153
2154 mutex_lock(&pinctrldev_list_mutex);
2155 mutex_lock(&pctldev->mutex);
2156
2157 list_del(&pctldev->node);
2158 pinmux_generic_free_functions(pctldev);
2159 pinctrl_generic_free_groups(pctldev);
2160
2161 pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
2162 pctldev->desc->npins);
2163
2164 list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node)
2165 list_del(&range->node);
2166
2167 mutex_unlock(&pctldev->mutex);
2168 mutex_destroy(&pctldev->mutex);
2169 kfree(pctldev);
2170 mutex_unlock(&pinctrldev_list_mutex);
2171}
2172EXPORT_SYMBOL_GPL(pinctrl_unregister);
2173
2174static void devm_pinctrl_dev_release(struct device *dev, void *res)
2175{
2176 struct pinctrl_dev *pctldev = *(struct pinctrl_dev **)res;
2177
2178 pinctrl_unregister(pctldev);
2179}
2180
2181static int devm_pinctrl_dev_match(struct device *dev, void *res, void *data)
2182{
2183 struct pctldev **r = res;
2184
2185 if (WARN_ON(!r || !*r))
2186 return 0;
2187
2188 return *r == data;
2189}
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202struct pinctrl_dev *devm_pinctrl_register(struct device *dev,
2203 struct pinctrl_desc *pctldesc,
2204 void *driver_data)
2205{
2206 struct pinctrl_dev **ptr, *pctldev;
2207
2208 ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL);
2209 if (!ptr)
2210 return ERR_PTR(-ENOMEM);
2211
2212 pctldev = pinctrl_register(pctldesc, dev, driver_data);
2213 if (IS_ERR(pctldev)) {
2214 devres_free(ptr);
2215 return pctldev;
2216 }
2217
2218 *ptr = pctldev;
2219 devres_add(dev, ptr);
2220
2221 return pctldev;
2222}
2223EXPORT_SYMBOL_GPL(devm_pinctrl_register);
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236int devm_pinctrl_register_and_init(struct device *dev,
2237 struct pinctrl_desc *pctldesc,
2238 void *driver_data,
2239 struct pinctrl_dev **pctldev)
2240{
2241 struct pinctrl_dev **ptr;
2242 int error;
2243
2244 ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL);
2245 if (!ptr)
2246 return -ENOMEM;
2247
2248 error = pinctrl_register_and_init(pctldesc, dev, driver_data, pctldev);
2249 if (error) {
2250 devres_free(ptr);
2251 return error;
2252 }
2253
2254 *ptr = *pctldev;
2255 devres_add(dev, ptr);
2256
2257 return 0;
2258}
2259EXPORT_SYMBOL_GPL(devm_pinctrl_register_and_init);
2260
2261
2262
2263
2264
2265
2266void devm_pinctrl_unregister(struct device *dev, struct pinctrl_dev *pctldev)
2267{
2268 WARN_ON(devres_release(dev, devm_pinctrl_dev_release,
2269 devm_pinctrl_dev_match, pctldev));
2270}
2271EXPORT_SYMBOL_GPL(devm_pinctrl_unregister);
2272
2273static int __init pinctrl_init(void)
2274{
2275 pr_info("initialized pinctrl subsystem\n");
2276 pinctrl_init_debugfs();
2277 return 0;
2278}
2279
2280
2281core_initcall(pinctrl_init);
2282