/
rc-main.c
2088 lines (1779 loc) · 53.2 KB
/
rc-main.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// SPDX-License-Identifier: GPL-2.0
// rc-main.c - Remote Controller core module
//
// Copyright (C) 2009-2010 by Mauro Carvalho Chehab
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <media/rc-core.h>
#include <linux/bsearch.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/input.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/idr.h>
#include <linux/device.h>
#include <linux/module.h>
#include "rc-core-priv.h"
/* Sizes are in bytes, 256 bytes allows for 32 entries on x64 */
#define IR_TAB_MIN_SIZE 256
#define IR_TAB_MAX_SIZE 8192
static const struct {
const char *name;
unsigned int repeat_period;
unsigned int scancode_bits;
} protocols[] = {
[RC_PROTO_UNKNOWN] = { .name = "unknown", .repeat_period = 125 },
[RC_PROTO_OTHER] = { .name = "other", .repeat_period = 125 },
[RC_PROTO_RC5] = { .name = "rc-5",
.scancode_bits = 0x1f7f, .repeat_period = 114 },
[RC_PROTO_RC5X_20] = { .name = "rc-5x-20",
.scancode_bits = 0x1f7f3f, .repeat_period = 114 },
[RC_PROTO_RC5_SZ] = { .name = "rc-5-sz",
.scancode_bits = 0x2fff, .repeat_period = 114 },
[RC_PROTO_JVC] = { .name = "jvc",
.scancode_bits = 0xffff, .repeat_period = 125 },
[RC_PROTO_SONY12] = { .name = "sony-12",
.scancode_bits = 0x1f007f, .repeat_period = 100 },
[RC_PROTO_SONY15] = { .name = "sony-15",
.scancode_bits = 0xff007f, .repeat_period = 100 },
[RC_PROTO_SONY20] = { .name = "sony-20",
.scancode_bits = 0x1fff7f, .repeat_period = 100 },
[RC_PROTO_NEC] = { .name = "nec",
.scancode_bits = 0xffff, .repeat_period = 110 },
[RC_PROTO_NECX] = { .name = "nec-x",
.scancode_bits = 0xffffff, .repeat_period = 110 },
[RC_PROTO_NEC32] = { .name = "nec-32",
.scancode_bits = 0xffffffff, .repeat_period = 110 },
[RC_PROTO_SANYO] = { .name = "sanyo",
.scancode_bits = 0x1fffff, .repeat_period = 125 },
[RC_PROTO_MCIR2_KBD] = { .name = "mcir2-kbd",
.scancode_bits = 0xffffff, .repeat_period = 100 },
[RC_PROTO_MCIR2_MSE] = { .name = "mcir2-mse",
.scancode_bits = 0x1fffff, .repeat_period = 100 },
[RC_PROTO_RC6_0] = { .name = "rc-6-0",
.scancode_bits = 0xffff, .repeat_period = 114 },
[RC_PROTO_RC6_6A_20] = { .name = "rc-6-6a-20",
.scancode_bits = 0xfffff, .repeat_period = 114 },
[RC_PROTO_RC6_6A_24] = { .name = "rc-6-6a-24",
.scancode_bits = 0xffffff, .repeat_period = 114 },
[RC_PROTO_RC6_6A_32] = { .name = "rc-6-6a-32",
.scancode_bits = 0xffffffff, .repeat_period = 114 },
[RC_PROTO_RC6_MCE] = { .name = "rc-6-mce",
.scancode_bits = 0xffff7fff, .repeat_period = 114 },
[RC_PROTO_SHARP] = { .name = "sharp",
.scancode_bits = 0x1fff, .repeat_period = 125 },
[RC_PROTO_XMP] = { .name = "xmp", .repeat_period = 125 },
[RC_PROTO_CEC] = { .name = "cec", .repeat_period = 0 },
[RC_PROTO_IMON] = { .name = "imon",
.scancode_bits = 0x7fffffff, .repeat_period = 114 },
[RC_PROTO_RCMM12] = { .name = "rc-mm-12",
.scancode_bits = 0x00000fff, .repeat_period = 114 },
[RC_PROTO_RCMM24] = { .name = "rc-mm-24",
.scancode_bits = 0x00ffffff, .repeat_period = 114 },
[RC_PROTO_RCMM32] = { .name = "rc-mm-32",
.scancode_bits = 0xffffffff, .repeat_period = 114 },
[RC_PROTO_XBOX_DVD] = { .name = "xbox-dvd", .repeat_period = 64 },
};
/* Used to keep track of known keymaps */
static LIST_HEAD(rc_map_list);
static DEFINE_SPINLOCK(rc_map_lock);
static struct led_trigger *led_feedback;
/* Used to keep track of rc devices */
static DEFINE_IDA(rc_ida);
static struct rc_map_list *seek_rc_map(const char *name)
{
struct rc_map_list *map = NULL;
spin_lock(&rc_map_lock);
list_for_each_entry(map, &rc_map_list, list) {
if (!strcmp(name, map->map.name)) {
spin_unlock(&rc_map_lock);
return map;
}
}
spin_unlock(&rc_map_lock);
return NULL;
}
struct rc_map *rc_map_get(const char *name)
{
struct rc_map_list *map;
map = seek_rc_map(name);
#ifdef CONFIG_MODULES
if (!map) {
int rc = request_module("%s", name);
if (rc < 0) {
pr_err("Couldn't load IR keymap %s\n", name);
return NULL;
}
msleep(20); /* Give some time for IR to register */
map = seek_rc_map(name);
}
#endif
if (!map) {
pr_err("IR keymap %s not found\n", name);
return NULL;
}
printk(KERN_INFO "Registered IR keymap %s\n", map->map.name);
return &map->map;
}
EXPORT_SYMBOL_GPL(rc_map_get);
int rc_map_register(struct rc_map_list *map)
{
spin_lock(&rc_map_lock);
list_add_tail(&map->list, &rc_map_list);
spin_unlock(&rc_map_lock);
return 0;
}
EXPORT_SYMBOL_GPL(rc_map_register);
void rc_map_unregister(struct rc_map_list *map)
{
spin_lock(&rc_map_lock);
list_del(&map->list);
spin_unlock(&rc_map_lock);
}
EXPORT_SYMBOL_GPL(rc_map_unregister);
static struct rc_map_table empty[] = {
{ 0x2a, KEY_COFFEE },
};
static struct rc_map_list empty_map = {
.map = {
.scan = empty,
.size = ARRAY_SIZE(empty),
.rc_proto = RC_PROTO_UNKNOWN, /* Legacy IR type */
.name = RC_MAP_EMPTY,
}
};
/**
* scancode_to_u64() - converts scancode in &struct input_keymap_entry
* @ke: keymap entry containing scancode to be converted.
* @scancode: pointer to the location where converted scancode should
* be stored.
*
* This function is a version of input_scancode_to_scalar specialized for
* rc-core.
*/
static int scancode_to_u64(const struct input_keymap_entry *ke, u64 *scancode)
{
switch (ke->len) {
case 1:
*scancode = *((u8 *)ke->scancode);
break;
case 2:
*scancode = *((u16 *)ke->scancode);
break;
case 4:
*scancode = *((u32 *)ke->scancode);
break;
case 8:
*scancode = *((u64 *)ke->scancode);
break;
default:
return -EINVAL;
}
return 0;
}
/**
* ir_create_table() - initializes a scancode table
* @dev: the rc_dev device
* @rc_map: the rc_map to initialize
* @name: name to assign to the table
* @rc_proto: ir type to assign to the new table
* @size: initial size of the table
*
* This routine will initialize the rc_map and will allocate
* memory to hold at least the specified number of elements.
*
* return: zero on success or a negative error code
*/
static int ir_create_table(struct rc_dev *dev, struct rc_map *rc_map,
const char *name, u64 rc_proto, size_t size)
{
rc_map->name = kstrdup(name, GFP_KERNEL);
if (!rc_map->name)
return -ENOMEM;
rc_map->rc_proto = rc_proto;
rc_map->alloc = roundup_pow_of_two(size * sizeof(struct rc_map_table));
rc_map->size = rc_map->alloc / sizeof(struct rc_map_table);
rc_map->scan = kmalloc(rc_map->alloc, GFP_KERNEL);
if (!rc_map->scan) {
kfree(rc_map->name);
rc_map->name = NULL;
return -ENOMEM;
}
dev_dbg(&dev->dev, "Allocated space for %u keycode entries (%u bytes)\n",
rc_map->size, rc_map->alloc);
return 0;
}
/**
* ir_free_table() - frees memory allocated by a scancode table
* @rc_map: the table whose mappings need to be freed
*
* This routine will free memory alloctaed for key mappings used by given
* scancode table.
*/
static void ir_free_table(struct rc_map *rc_map)
{
rc_map->size = 0;
kfree(rc_map->name);
rc_map->name = NULL;
kfree(rc_map->scan);
rc_map->scan = NULL;
}
/**
* ir_resize_table() - resizes a scancode table if necessary
* @dev: the rc_dev device
* @rc_map: the rc_map to resize
* @gfp_flags: gfp flags to use when allocating memory
*
* This routine will shrink the rc_map if it has lots of
* unused entries and grow it if it is full.
*
* return: zero on success or a negative error code
*/
static int ir_resize_table(struct rc_dev *dev, struct rc_map *rc_map,
gfp_t gfp_flags)
{
unsigned int oldalloc = rc_map->alloc;
unsigned int newalloc = oldalloc;
struct rc_map_table *oldscan = rc_map->scan;
struct rc_map_table *newscan;
if (rc_map->size == rc_map->len) {
/* All entries in use -> grow keytable */
if (rc_map->alloc >= IR_TAB_MAX_SIZE)
return -ENOMEM;
newalloc *= 2;
dev_dbg(&dev->dev, "Growing table to %u bytes\n", newalloc);
}
if ((rc_map->len * 3 < rc_map->size) && (oldalloc > IR_TAB_MIN_SIZE)) {
/* Less than 1/3 of entries in use -> shrink keytable */
newalloc /= 2;
dev_dbg(&dev->dev, "Shrinking table to %u bytes\n", newalloc);
}
if (newalloc == oldalloc)
return 0;
newscan = kmalloc(newalloc, gfp_flags);
if (!newscan)
return -ENOMEM;
memcpy(newscan, rc_map->scan, rc_map->len * sizeof(struct rc_map_table));
rc_map->scan = newscan;
rc_map->alloc = newalloc;
rc_map->size = rc_map->alloc / sizeof(struct rc_map_table);
kfree(oldscan);
return 0;
}
/**
* ir_update_mapping() - set a keycode in the scancode->keycode table
* @dev: the struct rc_dev device descriptor
* @rc_map: scancode table to be adjusted
* @index: index of the mapping that needs to be updated
* @new_keycode: the desired keycode
*
* This routine is used to update scancode->keycode mapping at given
* position.
*
* return: previous keycode assigned to the mapping
*
*/
static unsigned int ir_update_mapping(struct rc_dev *dev,
struct rc_map *rc_map,
unsigned int index,
unsigned int new_keycode)
{
int old_keycode = rc_map->scan[index].keycode;
int i;
/* Did the user wish to remove the mapping? */
if (new_keycode == KEY_RESERVED || new_keycode == KEY_UNKNOWN) {
dev_dbg(&dev->dev, "#%d: Deleting scan 0x%04llx\n",
index, rc_map->scan[index].scancode);
rc_map->len--;
memmove(&rc_map->scan[index], &rc_map->scan[index+ 1],
(rc_map->len - index) * sizeof(struct rc_map_table));
} else {
dev_dbg(&dev->dev, "#%d: %s scan 0x%04llx with key 0x%04x\n",
index,
old_keycode == KEY_RESERVED ? "New" : "Replacing",
rc_map->scan[index].scancode, new_keycode);
rc_map->scan[index].keycode = new_keycode;
__set_bit(new_keycode, dev->input_dev->keybit);
}
if (old_keycode != KEY_RESERVED) {
/* A previous mapping was updated... */
__clear_bit(old_keycode, dev->input_dev->keybit);
/* ... but another scancode might use the same keycode */
for (i = 0; i < rc_map->len; i++) {
if (rc_map->scan[i].keycode == old_keycode) {
__set_bit(old_keycode, dev->input_dev->keybit);
break;
}
}
/* Possibly shrink the keytable, failure is not a problem */
ir_resize_table(dev, rc_map, GFP_ATOMIC);
}
return old_keycode;
}
/**
* ir_establish_scancode() - set a keycode in the scancode->keycode table
* @dev: the struct rc_dev device descriptor
* @rc_map: scancode table to be searched
* @scancode: the desired scancode
* @resize: controls whether we allowed to resize the table to
* accommodate not yet present scancodes
*
* This routine is used to locate given scancode in rc_map.
* If scancode is not yet present the routine will allocate a new slot
* for it.
*
* return: index of the mapping containing scancode in question
* or -1U in case of failure.
*/
static unsigned int ir_establish_scancode(struct rc_dev *dev,
struct rc_map *rc_map,
u64 scancode, bool resize)
{
unsigned int i;
/*
* Unfortunately, some hardware-based IR decoders don't provide
* all bits for the complete IR code. In general, they provide only
* the command part of the IR code. Yet, as it is possible to replace
* the provided IR with another one, it is needed to allow loading
* IR tables from other remotes. So, we support specifying a mask to
* indicate the valid bits of the scancodes.
*/
if (dev->scancode_mask)
scancode &= dev->scancode_mask;
/* First check if we already have a mapping for this ir command */
for (i = 0; i < rc_map->len; i++) {
if (rc_map->scan[i].scancode == scancode)
return i;
/* Keytable is sorted from lowest to highest scancode */
if (rc_map->scan[i].scancode >= scancode)
break;
}
/* No previous mapping found, we might need to grow the table */
if (rc_map->size == rc_map->len) {
if (!resize || ir_resize_table(dev, rc_map, GFP_ATOMIC))
return -1U;
}
/* i is the proper index to insert our new keycode */
if (i < rc_map->len)
memmove(&rc_map->scan[i + 1], &rc_map->scan[i],
(rc_map->len - i) * sizeof(struct rc_map_table));
rc_map->scan[i].scancode = scancode;
rc_map->scan[i].keycode = KEY_RESERVED;
rc_map->len++;
return i;
}
/**
* ir_setkeycode() - set a keycode in the scancode->keycode table
* @idev: the struct input_dev device descriptor
* @ke: Input keymap entry
* @old_keycode: result
*
* This routine is used to handle evdev EVIOCSKEY ioctl.
*
* return: -EINVAL if the keycode could not be inserted, otherwise zero.
*/
static int ir_setkeycode(struct input_dev *idev,
const struct input_keymap_entry *ke,
unsigned int *old_keycode)
{
struct rc_dev *rdev = input_get_drvdata(idev);
struct rc_map *rc_map = &rdev->rc_map;
unsigned int index;
u64 scancode;
int retval = 0;
unsigned long flags;
spin_lock_irqsave(&rc_map->lock, flags);
if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
index = ke->index;
if (index >= rc_map->len) {
retval = -EINVAL;
goto out;
}
} else {
retval = scancode_to_u64(ke, &scancode);
if (retval)
goto out;
index = ir_establish_scancode(rdev, rc_map, scancode, true);
if (index >= rc_map->len) {
retval = -ENOMEM;
goto out;
}
}
*old_keycode = ir_update_mapping(rdev, rc_map, index, ke->keycode);
out:
spin_unlock_irqrestore(&rc_map->lock, flags);
return retval;
}
/**
* ir_setkeytable() - sets several entries in the scancode->keycode table
* @dev: the struct rc_dev device descriptor
* @from: the struct rc_map to copy entries from
*
* This routine is used to handle table initialization.
*
* return: -ENOMEM if all keycodes could not be inserted, otherwise zero.
*/
static int ir_setkeytable(struct rc_dev *dev, const struct rc_map *from)
{
struct rc_map *rc_map = &dev->rc_map;
unsigned int i, index;
int rc;
rc = ir_create_table(dev, rc_map, from->name, from->rc_proto,
from->size);
if (rc)
return rc;
for (i = 0; i < from->size; i++) {
index = ir_establish_scancode(dev, rc_map,
from->scan[i].scancode, false);
if (index >= rc_map->len) {
rc = -ENOMEM;
break;
}
ir_update_mapping(dev, rc_map, index,
from->scan[i].keycode);
}
if (rc)
ir_free_table(rc_map);
return rc;
}
static int rc_map_cmp(const void *key, const void *elt)
{
const u64 *scancode = key;
const struct rc_map_table *e = elt;
if (*scancode < e->scancode)
return -1;
else if (*scancode > e->scancode)
return 1;
return 0;
}
/**
* ir_lookup_by_scancode() - locate mapping by scancode
* @rc_map: the struct rc_map to search
* @scancode: scancode to look for in the table
*
* This routine performs binary search in RC keykeymap table for
* given scancode.
*
* return: index in the table, -1U if not found
*/
static unsigned int ir_lookup_by_scancode(const struct rc_map *rc_map,
u64 scancode)
{
struct rc_map_table *res;
res = bsearch(&scancode, rc_map->scan, rc_map->len,
sizeof(struct rc_map_table), rc_map_cmp);
if (!res)
return -1U;
else
return res - rc_map->scan;
}
/**
* ir_getkeycode() - get a keycode from the scancode->keycode table
* @idev: the struct input_dev device descriptor
* @ke: Input keymap entry
*
* This routine is used to handle evdev EVIOCGKEY ioctl.
*
* return: always returns zero.
*/
static int ir_getkeycode(struct input_dev *idev,
struct input_keymap_entry *ke)
{
struct rc_dev *rdev = input_get_drvdata(idev);
struct rc_map *rc_map = &rdev->rc_map;
struct rc_map_table *entry;
unsigned long flags;
unsigned int index;
u64 scancode;
int retval;
spin_lock_irqsave(&rc_map->lock, flags);
if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
index = ke->index;
} else {
retval = scancode_to_u64(ke, &scancode);
if (retval)
goto out;
index = ir_lookup_by_scancode(rc_map, scancode);
}
if (index < rc_map->len) {
entry = &rc_map->scan[index];
ke->index = index;
ke->keycode = entry->keycode;
ke->len = sizeof(entry->scancode);
memcpy(ke->scancode, &entry->scancode, sizeof(entry->scancode));
} else if (!(ke->flags & INPUT_KEYMAP_BY_INDEX)) {
/*
* We do not really know the valid range of scancodes
* so let's respond with KEY_RESERVED to anything we
* do not have mapping for [yet].
*/
ke->index = index;
ke->keycode = KEY_RESERVED;
} else {
retval = -EINVAL;
goto out;
}
retval = 0;
out:
spin_unlock_irqrestore(&rc_map->lock, flags);
return retval;
}
/**
* rc_g_keycode_from_table() - gets the keycode that corresponds to a scancode
* @dev: the struct rc_dev descriptor of the device
* @scancode: the scancode to look for
*
* This routine is used by drivers which need to convert a scancode to a
* keycode. Normally it should not be used since drivers should have no
* interest in keycodes.
*
* return: the corresponding keycode, or KEY_RESERVED
*/
u32 rc_g_keycode_from_table(struct rc_dev *dev, u64 scancode)
{
struct rc_map *rc_map = &dev->rc_map;
unsigned int keycode;
unsigned int index;
unsigned long flags;
spin_lock_irqsave(&rc_map->lock, flags);
index = ir_lookup_by_scancode(rc_map, scancode);
keycode = index < rc_map->len ?
rc_map->scan[index].keycode : KEY_RESERVED;
spin_unlock_irqrestore(&rc_map->lock, flags);
if (keycode != KEY_RESERVED)
dev_dbg(&dev->dev, "%s: scancode 0x%04llx keycode 0x%02x\n",
dev->device_name, scancode, keycode);
return keycode;
}
EXPORT_SYMBOL_GPL(rc_g_keycode_from_table);
/**
* ir_do_keyup() - internal function to signal the release of a keypress
* @dev: the struct rc_dev descriptor of the device
* @sync: whether or not to call input_sync
*
* This function is used internally to release a keypress, it must be
* called with keylock held.
*/
static void ir_do_keyup(struct rc_dev *dev, bool sync)
{
if (!dev->keypressed)
return;
dev_dbg(&dev->dev, "keyup key 0x%04x\n", dev->last_keycode);
del_timer(&dev->timer_repeat);
input_report_key(dev->input_dev, dev->last_keycode, 0);
led_trigger_event(led_feedback, LED_OFF);
if (sync)
input_sync(dev->input_dev);
dev->keypressed = false;
}
/**
* rc_keyup() - signals the release of a keypress
* @dev: the struct rc_dev descriptor of the device
*
* This routine is used to signal that a key has been released on the
* remote control.
*/
void rc_keyup(struct rc_dev *dev)
{
unsigned long flags;
spin_lock_irqsave(&dev->keylock, flags);
ir_do_keyup(dev, true);
spin_unlock_irqrestore(&dev->keylock, flags);
}
EXPORT_SYMBOL_GPL(rc_keyup);
/**
* ir_timer_keyup() - generates a keyup event after a timeout
*
* @t: a pointer to the struct timer_list
*
* This routine will generate a keyup event some time after a keydown event
* is generated when no further activity has been detected.
*/
static void ir_timer_keyup(struct timer_list *t)
{
struct rc_dev *dev = from_timer(dev, t, timer_keyup);
unsigned long flags;
/*
* ir->keyup_jiffies is used to prevent a race condition if a
* hardware interrupt occurs at this point and the keyup timer
* event is moved further into the future as a result.
*
* The timer will then be reactivated and this function called
* again in the future. We need to exit gracefully in that case
* to allow the input subsystem to do its auto-repeat magic or
* a keyup event might follow immediately after the keydown.
*/
spin_lock_irqsave(&dev->keylock, flags);
if (time_is_before_eq_jiffies(dev->keyup_jiffies))
ir_do_keyup(dev, true);
spin_unlock_irqrestore(&dev->keylock, flags);
}
/**
* ir_timer_repeat() - generates a repeat event after a timeout
*
* @t: a pointer to the struct timer_list
*
* This routine will generate a soft repeat event every REP_PERIOD
* milliseconds.
*/
static void ir_timer_repeat(struct timer_list *t)
{
struct rc_dev *dev = from_timer(dev, t, timer_repeat);
struct input_dev *input = dev->input_dev;
unsigned long flags;
spin_lock_irqsave(&dev->keylock, flags);
if (dev->keypressed) {
input_event(input, EV_KEY, dev->last_keycode, 2);
input_sync(input);
if (input->rep[REP_PERIOD])
mod_timer(&dev->timer_repeat, jiffies +
msecs_to_jiffies(input->rep[REP_PERIOD]));
}
spin_unlock_irqrestore(&dev->keylock, flags);
}
static unsigned int repeat_period(int protocol)
{
if (protocol >= ARRAY_SIZE(protocols))
return 100;
return protocols[protocol].repeat_period;
}
/**
* rc_repeat() - signals that a key is still pressed
* @dev: the struct rc_dev descriptor of the device
*
* This routine is used by IR decoders when a repeat message which does
* not include the necessary bits to reproduce the scancode has been
* received.
*/
void rc_repeat(struct rc_dev *dev)
{
unsigned long flags;
unsigned int timeout = usecs_to_jiffies(dev->timeout) +
msecs_to_jiffies(repeat_period(dev->last_protocol));
struct lirc_scancode sc = {
.scancode = dev->last_scancode, .rc_proto = dev->last_protocol,
.keycode = dev->keypressed ? dev->last_keycode : KEY_RESERVED,
.flags = LIRC_SCANCODE_FLAG_REPEAT |
(dev->last_toggle ? LIRC_SCANCODE_FLAG_TOGGLE : 0)
};
if (dev->allowed_protocols != RC_PROTO_BIT_CEC)
lirc_scancode_event(dev, &sc);
spin_lock_irqsave(&dev->keylock, flags);
if (dev->last_scancode <= U32_MAX) {
input_event(dev->input_dev, EV_MSC, MSC_SCAN,
dev->last_scancode);
input_sync(dev->input_dev);
}
if (dev->keypressed) {
dev->keyup_jiffies = jiffies + timeout;
mod_timer(&dev->timer_keyup, dev->keyup_jiffies);
}
spin_unlock_irqrestore(&dev->keylock, flags);
}
EXPORT_SYMBOL_GPL(rc_repeat);
/**
* ir_do_keydown() - internal function to process a keypress
* @dev: the struct rc_dev descriptor of the device
* @protocol: the protocol of the keypress
* @scancode: the scancode of the keypress
* @keycode: the keycode of the keypress
* @toggle: the toggle value of the keypress
*
* This function is used internally to register a keypress, it must be
* called with keylock held.
*/
static void ir_do_keydown(struct rc_dev *dev, enum rc_proto protocol,
u64 scancode, u32 keycode, u8 toggle)
{
bool new_event = (!dev->keypressed ||
dev->last_protocol != protocol ||
dev->last_scancode != scancode ||
dev->last_toggle != toggle);
struct lirc_scancode sc = {
.scancode = scancode, .rc_proto = protocol,
.flags = toggle ? LIRC_SCANCODE_FLAG_TOGGLE : 0,
.keycode = keycode
};
if (dev->allowed_protocols != RC_PROTO_BIT_CEC)
lirc_scancode_event(dev, &sc);
if (new_event && dev->keypressed)
ir_do_keyup(dev, false);
if (scancode <= U32_MAX)
input_event(dev->input_dev, EV_MSC, MSC_SCAN, scancode);
dev->last_protocol = protocol;
dev->last_scancode = scancode;
dev->last_toggle = toggle;
dev->last_keycode = keycode;
if (new_event && keycode != KEY_RESERVED) {
/* Register a keypress */
dev->keypressed = true;
dev_dbg(&dev->dev, "%s: key down event, key 0x%04x, protocol 0x%04x, scancode 0x%08llx\n",
dev->device_name, keycode, protocol, scancode);
input_report_key(dev->input_dev, keycode, 1);
led_trigger_event(led_feedback, LED_FULL);
}
/*
* For CEC, start sending repeat messages as soon as the first
* repeated message is sent, as long as REP_DELAY = 0 and REP_PERIOD
* is non-zero. Otherwise, the input layer will generate repeat
* messages.
*/
if (!new_event && keycode != KEY_RESERVED &&
dev->allowed_protocols == RC_PROTO_BIT_CEC &&
!timer_pending(&dev->timer_repeat) &&
dev->input_dev->rep[REP_PERIOD] &&
!dev->input_dev->rep[REP_DELAY]) {
input_event(dev->input_dev, EV_KEY, keycode, 2);
mod_timer(&dev->timer_repeat, jiffies +
msecs_to_jiffies(dev->input_dev->rep[REP_PERIOD]));
}
input_sync(dev->input_dev);
}
/**
* rc_keydown() - generates input event for a key press
* @dev: the struct rc_dev descriptor of the device
* @protocol: the protocol for the keypress
* @scancode: the scancode for the keypress
* @toggle: the toggle value (protocol dependent, if the protocol doesn't
* support toggle values, this should be set to zero)
*
* This routine is used to signal that a key has been pressed on the
* remote control.
*/
void rc_keydown(struct rc_dev *dev, enum rc_proto protocol, u64 scancode,
u8 toggle)
{
unsigned long flags;
u32 keycode = rc_g_keycode_from_table(dev, scancode);
spin_lock_irqsave(&dev->keylock, flags);
ir_do_keydown(dev, protocol, scancode, keycode, toggle);
if (dev->keypressed) {
dev->keyup_jiffies = jiffies + usecs_to_jiffies(dev->timeout) +
msecs_to_jiffies(repeat_period(protocol));
mod_timer(&dev->timer_keyup, dev->keyup_jiffies);
}
spin_unlock_irqrestore(&dev->keylock, flags);
}
EXPORT_SYMBOL_GPL(rc_keydown);
/**
* rc_keydown_notimeout() - generates input event for a key press without
* an automatic keyup event at a later time
* @dev: the struct rc_dev descriptor of the device
* @protocol: the protocol for the keypress
* @scancode: the scancode for the keypress
* @toggle: the toggle value (protocol dependent, if the protocol doesn't
* support toggle values, this should be set to zero)
*
* This routine is used to signal that a key has been pressed on the
* remote control. The driver must manually call rc_keyup() at a later stage.
*/
void rc_keydown_notimeout(struct rc_dev *dev, enum rc_proto protocol,
u64 scancode, u8 toggle)
{
unsigned long flags;
u32 keycode = rc_g_keycode_from_table(dev, scancode);
spin_lock_irqsave(&dev->keylock, flags);
ir_do_keydown(dev, protocol, scancode, keycode, toggle);
spin_unlock_irqrestore(&dev->keylock, flags);
}
EXPORT_SYMBOL_GPL(rc_keydown_notimeout);
/**
* rc_validate_scancode() - checks that a scancode is valid for a protocol.
* For nec, it should do the opposite of ir_nec_bytes_to_scancode()
* @proto: protocol
* @scancode: scancode
*/
bool rc_validate_scancode(enum rc_proto proto, u32 scancode)
{
switch (proto) {
/*
* NECX has a 16-bit address; if the lower 8 bits match the upper
* 8 bits inverted, then the address would match regular nec.
*/
case RC_PROTO_NECX:
if ((((scancode >> 16) ^ ~(scancode >> 8)) & 0xff) == 0)
return false;
break;
/*
* NEC32 has a 16 bit address and 16 bit command. If the lower 8 bits
* of the command match the upper 8 bits inverted, then it would
* be either NEC or NECX.
*/
case RC_PROTO_NEC32:
if ((((scancode >> 8) ^ ~scancode) & 0xff) == 0)
return false;
break;
/*
* If the customer code (top 32-bit) is 0x800f, it is MCE else it
* is regular mode-6a 32 bit
*/
case RC_PROTO_RC6_MCE:
if ((scancode & 0xffff0000) != 0x800f0000)
return false;
break;
case RC_PROTO_RC6_6A_32:
if ((scancode & 0xffff0000) == 0x800f0000)
return false;
break;
default:
break;
}
return true;
}
/**
* rc_validate_filter() - checks that the scancode and mask are valid and
* provides sensible defaults
* @dev: the struct rc_dev descriptor of the device
* @filter: the scancode and mask
*
* return: 0 or -EINVAL if the filter is not valid
*/
static int rc_validate_filter(struct rc_dev *dev,
struct rc_scancode_filter *filter)
{
u32 mask, s = filter->data;
enum rc_proto protocol = dev->wakeup_protocol;
if (protocol >= ARRAY_SIZE(protocols))
return -EINVAL;
mask = protocols[protocol].scancode_bits;
if (!rc_validate_scancode(protocol, s))
return -EINVAL;
filter->data &= mask;
filter->mask &= mask;
/*
* If we have to raw encode the IR for wakeup, we cannot have a mask
*/
if (dev->encode_wakeup && filter->mask != 0 && filter->mask != mask)
return -EINVAL;
return 0;
}
int rc_open(struct rc_dev *rdev)
{
int rval = 0;
if (!rdev)
return -EINVAL;
mutex_lock(&rdev->lock);
if (!rdev->registered) {
rval = -ENODEV;
} else {
if (!rdev->users++ && rdev->open)
rval = rdev->open(rdev);
if (rval)
rdev->users--;
}
mutex_unlock(&rdev->lock);
return rval;
}
static int ir_open(struct input_dev *idev)
{
struct rc_dev *rdev = input_get_drvdata(idev);
return rc_open(rdev);
}
void rc_close(struct rc_dev *rdev)