summaryrefslogtreecommitdiff
path: root/drivers/media/rc/rc-main.c
blob: 17950e29d4e3ec72a18e4ad2bee2286c99ab99e3 (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
/* rc-main.c - Remote Controller core module
 *
 * Copyright (C) 2009-2010 by Mauro Carvalho Chehab
 *
 * This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 */

#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
#define RC_DEV_MAX	256

static const struct {
	const char *name;
	unsigned int repeat_period;
	unsigned int scancode_bits;
} protocols[] = {
	[RC_PROTO_UNKNOWN] = { .name = "unknown", .repeat_period = 250 },
	[RC_PROTO_OTHER] = { .name = "other", .repeat_period = 250 },
	[RC_PROTO_RC5] = { .name = "rc-5",
		.scancode_bits = 0x1f7f, .repeat_period = 164 },
	[RC_PROTO_RC5X_20] = { .name = "rc-5x-20",
		.scancode_bits = 0x1f7f3f, .repeat_period = 164 },
	[RC_PROTO_RC5_SZ] = { .name = "rc-5-sz",
		.scancode_bits = 0x2fff, .repeat_period = 164 },
	[RC_PROTO_JVC] = { .name = "jvc",
		.scancode_bits = 0xffff, .repeat_period = 250 },
	[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 = 160 },
	[RC_PROTO_NECX] = { .name = "nec-x",
		.scancode_bits = 0xffffff, .repeat_period = 160 },
	[RC_PROTO_NEC32] = { .name = "nec-32",
		.scancode_bits = 0xffffffff, .repeat_period = 160 },
	[RC_PROTO_SANYO] = { .name = "sanyo",
		.scancode_bits = 0x1fffff, .repeat_period = 250 },
	[RC_PROTO_MCIR2_KBD] = { .name = "mcir2-kbd",
		.scancode_bits = 0xffff, .repeat_period = 150 },
	[RC_PROTO_MCIR2_MSE] = { .name = "mcir2-mse",
		.scancode_bits = 0x1fffff, .repeat_period = 150 },
	[RC_PROTO_RC6_0] = { .name = "rc-6-0",
		.scancode_bits = 0xffff, .repeat_period = 164 },
	[RC_PROTO_RC6_6A_20] = { .name = "rc-6-6a-20",
		.scancode_bits = 0xfffff, .repeat_period = 164 },
	[RC_PROTO_RC6_6A_24] = { .name = "rc-6-6a-24",
		.scancode_bits = 0xffffff, .repeat_period = 164 },
	[RC_PROTO_RC6_6A_32] = { .name = "rc-6-6a-32",
		.scancode_bits = 0xffffffff, .repeat_period = 164 },
	[RC_PROTO_RC6_MCE] = { .name = "rc-6-mce",
		.scancode_bits = 0xffff7fff, .repeat_period = 164 },
	[RC_PROTO_SHARP] = { .name = "sharp",
		.scancode_bits = 0x1fff, .repeat_period = 250 },
	[RC_PROTO_XMP] = { .name = "xmp", .repeat_period = 250 },
	[RC_PROTO_CEC] = { .name = "cec", .repeat_period = 550 },
};

/* 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,
	}
};

/**
 * ir_create_table() - initializes a scancode table
 * @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
 * @return:	zero on success or a negative error code
 *
 * This routine will initialize the rc_map and will allocate
 * memory to hold at least the specified number of elements.
 */
static int ir_create_table(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;
	}

	IR_dprintk(1, "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
 * @rc_map:	the rc_map to resize
 * @gfp_flags:	gfp flags to use when allocating memory
 * @return:	zero on success or a negative error code
 *
 * This routine will shrink the rc_map if it has lots of
 * unused entries and grow it if it is full.
 */
static int ir_resize_table(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;
		IR_dprintk(1, "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;
		IR_dprintk(1, "Shrinking table to %u bytes\n", newalloc);
	}

	if (newalloc == oldalloc)
		return 0;

	newscan = kmalloc(newalloc, gfp_flags);
	if (!newscan) {
		IR_dprintk(1, "Failed to kmalloc %u bytes\n", newalloc);
		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
 * @keycode:	the desired keycode
 * @return:	previous keycode assigned to the mapping
 *
 * This routine is used to update scancode->keycode mapping at given
 * position.
 */
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) {
		IR_dprintk(1, "#%d: Deleting scan 0x%04x\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 {
		IR_dprintk(1, "#%d: %s scan 0x%04x 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(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
 * @return:	index of the mapping containing scancode in question
 *		or -1U in case of failure.
 *
 * 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.
 */
static unsigned int ir_establish_scancode(struct rc_dev *dev,
					  struct rc_map *rc_map,
					  unsigned int 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(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
 * @scancode:	the desired scancode
 * @keycode:	result
 * @return:	-EINVAL if the keycode could not be inserted, otherwise zero.
 *
 * This routine is used to handle evdev EVIOCSKEY ioctl.
 */
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;
	unsigned int 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 = input_scancode_to_scalar(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
 * @to:		the struct rc_map to copy entries to
 * @from:	the struct rc_map to copy entries from
 * @return:	-ENOMEM if all keycodes could not be inserted, otherwise zero.
 *
 * This routine is used to handle table initialization.
 */
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(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 unsigned int *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
 * @return:	index in the table, -1U if not found
 *
 * This routine performs binary search in RC keykeymap table for
 * given scancode.
 */
static unsigned int ir_lookup_by_scancode(const struct rc_map *rc_map,
					  unsigned int 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
 * @scancode:	the desired scancode
 * @keycode:	used to return the keycode, if found, or KEY_RESERVED
 * @return:	always returns zero.
 *
 * This routine is used to handle evdev EVIOCGKEY ioctl.
 */
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;
	unsigned int scancode;
	int retval;

	spin_lock_irqsave(&rc_map->lock, flags);

	if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
		index = ke->index;
	} else {
		retval = input_scancode_to_scalar(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
 * @return:	the corresponding keycode, or KEY_RESERVED
 *
 * 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.
 */
u32 rc_g_keycode_from_table(struct rc_dev *dev, u32 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)
		IR_dprintk(1, "%s: scancode 0x%04x 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;

	IR_dprintk(1, "keyup key 0x%04x\n", dev->last_keycode);
	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
 * @cookie:	a pointer to the struct rc_dev for the device
 *
 * 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);
}

/**
 * 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 = protocols[dev->last_protocol].repeat_period;

	spin_lock_irqsave(&dev->keylock, flags);

	if (!dev->keypressed)
		goto out;

	input_event(dev->input_dev, EV_MSC, MSC_SCAN, dev->last_scancode);
	input_sync(dev->input_dev);

	dev->keyup_jiffies = jiffies + msecs_to_jiffies(timeout);
	mod_timer(&dev->timer_keyup, dev->keyup_jiffies);

out:
	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,
			  u32 scancode, u32 keycode, u8 toggle)
{
	bool new_event = (!dev->keypressed		 ||
			  dev->last_protocol != protocol ||
			  dev->last_scancode != scancode ||
			  dev->last_toggle   != toggle);

	if (new_event && dev->keypressed)
		ir_do_keyup(dev, false);

	input_event(dev->input_dev, EV_MSC, MSC_SCAN, scancode);

	if (new_event && keycode != KEY_RESERVED) {
		/* Register a keypress */
		dev->keypressed = true;
		dev->last_protocol = protocol;
		dev->last_scancode = scancode;
		dev->last_toggle = toggle;
		dev->last_keycode = keycode;

		IR_dprintk(1, "%s: key down event, key 0x%04x, protocol 0x%04x, scancode 0x%08x\n",
			   dev->device_name, keycode, protocol, scancode);
		input_report_key(dev->input_dev, keycode, 1);

		led_trigger_event(led_feedback, LED_FULL);
	}

	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, u32 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 +
			msecs_to_jiffies(protocols[protocol].repeat_period);
		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,
			  u32 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_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;

	switch (protocol) {
	case RC_PROTO_NECX:
		if ((((s >> 16) ^ ~(s >> 8)) & 0xff) == 0)
			return -EINVAL;
		break;
	case RC_PROTO_NEC32:
		if ((((s >> 24) ^ ~(s >> 16)) & 0xff) == 0)
			return -EINVAL;
		break;
	case RC_PROTO_RC6_MCE:
		if ((s & 0xffff0000) != 0x800f0000)
			return -EINVAL;
		break;
	case RC_PROTO_RC6_6A_32:
		if ((s & 0xffff0000) == 0x800f0000)
			return -EINVAL;
		break;
	default:
		break;
	}

	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->users++ && rdev->open != NULL)
		rval = rdev->open(rdev);

	if (rval)
		rdev->users--;

	mutex_unlock(&rdev->lock);

	return rval;
}
EXPORT_SYMBOL_GPL(rc_open);

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)
{
	if (rdev) {
		mutex_lock(&rdev->lock);

		if (!--rdev->users && rdev->close != NULL)
			rdev->close(rdev);

		mutex_unlock(&rdev->lock);
	}
}
EXPORT_SYMBOL_GPL(rc_close);

static void ir_close(struct input_dev *idev)
{
	struct rc_dev *rdev = input_get_drvdata(idev);
	rc_close(rdev);
}

/* class for /sys/class/rc */
static char *rc_devnode(struct device *dev, umode_t *mode)
{
	return kasprintf(GFP_KERNEL, "rc/%s", dev_name(dev));
}

static struct class rc_class = {
	.name		= "rc",
	.devnode	= rc_devnode,
};

/*
 * These are the protocol textual descriptions that are
 * used by the sysfs protocols file. Note that the order
 * of the entries is relevant.
 */
static const struct {
	u64	type;
	const char	*name;
	const char	*module_name;
} proto_names[] = {
	{ RC_PROTO_BIT_NONE,	"none",		NULL			},
	{ RC_PROTO_BIT_OTHER,	"other",	NULL			},
	{ RC_PROTO_BIT_UNKNOWN,	"unknown",	NULL			},
	{ RC_PROTO_BIT_RC5 |
	  RC_PROTO_BIT_RC5X_20,	"rc-5",		"ir-rc5-decoder"	},
	{ RC_PROTO_BIT_NEC |
	  RC_PROTO_BIT_NECX |
	  RC_PROTO_BIT_NEC32,	"nec",		"ir-nec-decoder"	},
	{ RC_PROTO_BIT_RC6_0 |
	  RC_PROTO_BIT_RC6_6A_20 |
	  RC_PROTO_BIT_RC6_6A_24 |
	  RC_PROTO_BIT_RC6_6A_32 |
	  RC_PROTO_BIT_RC6_MCE,	"rc-6",		"ir-rc6-decoder"	},
	{ RC_PROTO_BIT_JVC,	"jvc",		"ir-jvc-decoder"	},
	{ RC_PROTO_BIT_SONY12 |
	  RC_PROTO_BIT_SONY15 |
	  RC_PROTO_BIT_SONY20,	"sony",		"ir-sony-decoder"	},
	{ RC_PROTO_BIT_RC5_SZ,	"rc-5-sz",	"ir-rc5-decoder"	},
	{ RC_PROTO_BIT_SANYO,	"sanyo",	"ir-sanyo-decoder"	},
	{ RC_PROTO_BIT_SHARP,	"sharp",	"ir-sharp-decoder"	},
	{ RC_PROTO_BIT_MCIR2_KBD |
	  RC_PROTO_BIT_MCIR2_MSE, "mce_kbd",	"ir-mce_kbd-decoder"	},
	{ RC_PROTO_BIT_XMP,	"xmp",		"ir-xmp-decoder"	},
	{ RC_PROTO_BIT_CEC,	"cec",		NULL			},
};

/**
 * struct rc_filter_attribute - Device attribute relating to a filter type.
 * @attr:	Device attribute.
 * @type:	Filter type.
 * @mask:	false for filter value, true for filter mask.
 */
struct rc_filter_attribute {
	struct device_attribute		attr;
	enum rc_filter_type		type;
	bool				mask;
};
#define to_rc_filter_attr(a) container_of(a, struct rc_filter_attribute, attr)

#define RC_FILTER_ATTR(_name, _mode, _show, _store, _type, _mask)	\
	struct rc_filter_attribute dev_attr_##_name = {			\
		.attr = __ATTR(_name, _mode, _show, _store),		\
		.type = (_type),					\
		.mask = (_mask),					\
	}

static bool lirc_is_present(void)
{
#if defined(CONFIG_LIRC_MODULE)
	struct module *lirc;

	mutex_lock(&module_mutex);
	lirc = find_module("lirc_dev");
	mutex_unlock(&module_mutex);

	return lirc ? true : false;
#elif defined(CONFIG_LIRC)
	return true;
#else
	return false;
#endif
}

/**
 * show_protocols() - shows the current IR protocol(s)
 * @device:	the device descriptor
 * @mattr:	the device attribute struct
 * @buf:	a pointer to the output buffer
 *
 * This routine is a callback routine for input read the IR protocol type(s).
 * it is trigged by reading /sys/class/rc/rc?/protocols.
 * It returns the protocol names of supported protocols.
 * Enabled protocols are printed in brackets.
 *
 * dev->lock is taken to guard against races between
 * store_protocols and show_protocols.
 */
static ssize_t show_protocols(struct device *device,
			      struct device_attribute *mattr, char *buf)
{
	struct rc_dev *dev = to_rc_dev(device);
	u64 allowed, enabled;
	char *tmp = buf;
	int i;

	mutex_lock(&dev->lock);

	enabled = dev->enabled_protocols;
	allowed = dev->allowed_protocols;
	if (dev->raw && !allowed)
		allowed = ir_raw_get_allowed_protocols();

	mutex_unlock(&dev->lock);

	IR_dprintk(1, "%s: allowed - 0x%llx, enabled - 0x%llx\n",
		   __func__, (long long)allowed, (long long)enabled);

	for (i = 0; i < ARRAY_SIZE(proto_names); i++) {
		if (allowed & enabled & proto_names[i].type)
			tmp += sprintf(tmp, "[%s] ", proto_names[i].name);
		else if (allowed & proto_names[i].type)
			tmp += sprintf(tmp, "%s ", proto_names[i].name);

		if (allowed & proto_names[i].type)
			allowed &= ~proto_names[i].type;
	}

	if (dev->driver_type == RC_DRIVER_IR_RAW && lirc_is_present())
		tmp += sprintf(tmp, "[lirc] ");

	if (tmp != buf)
		tmp--;
	*tmp = '\n';

	return tmp + 1 - buf;
}

/**
 * parse_protocol_change() - parses a protocol change request
 * @protocols:	pointer to the bitmask of current protocols
 * @buf:	pointer to the buffer with a list of changes
 *
 * Writing "+proto" will add a protocol to the protocol mask.
 * Writing "-proto" will remove a protocol from protocol mask.
 * Writing "proto" will enable only "proto".
 * Writing "none" will disable all protocols.
 * Returns the number of changes performed or a negative error code.
 */
static int parse_protocol_change(u64 *protocols, const char *buf)
{
	const char *tmp;
	unsigned count = 0;
	bool enable, disable;
	u64 mask;
	int i;

	while ((tmp = strsep((char **)&buf, " \n")) != NULL) {
		if (!*tmp)
			break;

		if (*tmp == '+') {
			enable = true;
			disable = false;
			tmp++;
		} else if (*tmp == '-') {
			enable = false;
			disable = true;
			tmp++;
		} else {
			enable = false;
			disable = false;
		}

		for (i = 0; i < ARRAY_SIZE(proto_names); i++) {
			if (!strcasecmp(tmp, proto_names[i].name)) {
				mask = proto_names[i].type;
				break;
			}
		}

		if (i == ARRAY_SIZE(proto_names)) {
			if (!strcasecmp(tmp, "lirc"))
				mask = 0;
			else {
				IR_dprintk(1, "Unknown protocol: '%s'\n", tmp);
				return -EINVAL;
			}
		}

		count++;

		if (enable)
			*protocols |= mask;
		else if (disable)
			*protocols &= ~mask;
		else
			*protocols = mask;
	}

	if (!count) {
		IR_dprintk(1, "Protocol not specified\n");
		return -EINVAL;
	}

	return count;
}

static void ir_raw_load_modules(u64 *protocols)
{
	u64 available;
	int i, ret;

	for (i = 0; i < ARRAY_SIZE(proto_names); i++) {
		if (proto_names[i].type == RC_PROTO_BIT_NONE ||
		    proto_names[i].type & (RC_PROTO_BIT_OTHER |
					   RC_PROTO_BIT_UNKNOWN))
			continue;

		available = ir_raw_get_allowed_protocols();
		if (!(*protocols & proto_names[i].type & ~available))
			continue;

		if (!proto_names[i].module_name) {
			pr_err("Can't enable IR protocol %s\n",
			       proto_names[i].name);
			*protocols &= ~proto_names[i].type;
			continue;
		}

		ret = request_module("%s", proto_names[i].module_name);
		if (ret < 0) {
			pr_err("Couldn't load IR protocol module %s\n",
			       proto_names[i].module_name);
			*protocols &= ~proto_names[i].type;
			continue;
		}
		msleep(20);
		available = ir_raw_get_allowed_protocols();
		if (!(*protocols & proto_names[i].type & ~available))
			continue;

		pr_err("Loaded IR protocol module %s, but protocol %s still not available\n",
		       proto_names[i].module_name,
		       proto_names[i].name);
		*protocols &= ~proto_names[i].type;
	}
}

/**
 * store_protocols() - changes the current/wakeup IR protocol(s)
 * @device:	the device descriptor
 * @mattr:	the device attribute struct
 * @buf:	a pointer to the input buffer
 * @len:	length of the input buffer
 *
 * This routine is for changing the IR protocol type.
 * It is trigged by writing to /sys/class/rc/rc?/[wakeup_]protocols.
 * See parse_protocol_change() for the valid commands.
 * Returns @len on success or a negative error code.
 *
 * dev->lock is taken to guard against races between
 * store_protocols and show_protocols.
 */
static ssize_t store_protocols(struct device *device,
			       struct device_attribute *mattr,
			       const char *buf, size_t len)
{
	struct rc_dev *dev = to_rc_dev(device);
	u64 *current_protocols;
	struct rc_scancode_filter *filter;
	u64 old_protocols, new_protocols;
	ssize_t rc;

	IR_dprintk(1, "Normal protocol change requested\n");
	current_protocols = &dev->enabled_protocols;
	filter = &dev->scancode_filter;

	if (!dev->change_protocol) {
		IR_dprintk(1, "Protocol switching not supported\n");
		return -EINVAL;
	}

	mutex_lock(&dev->lock);

	old_protocols = *current_protocols;
	new_protocols = old_protocols;
	rc = parse_protocol_change(&new_protocols, buf);
	if (rc < 0)
		goto out;

	rc = dev->change_protocol(dev, &new_protocols);
	if (rc < 0) {
		IR_dprintk(1, "Error setting protocols to 0x%llx\n",
			   (long long)new_protocols);
		goto out;
	}

	if (dev->driver_type == RC_DRIVER_IR_RAW)
		ir_raw_load_modules(&new_protocols);

	if (new_protocols != old_protocols) {
		*current_protocols = new_protocols;
		IR_dprintk(1, "Protocols changed to 0x%llx\n",
			   (long long)new_protocols);
	}

	/*
	 * If a protocol change was attempted the filter may need updating, even
	 * if the actual protocol mask hasn't changed (since the driver may have
	 * cleared the filter).
	 * Try setting the same filter with the new protocol (if any).
	 * Fall back to clearing the filter.
	 */
	if (dev->s_filter && filter->mask) {
		if (new_protocols)
			rc = dev->s_filter(dev, filter);
		else
			rc = -1;

		if (rc < 0) {
			filter->data = 0;
			filter->mask = 0;
			dev->s_filter(dev, filter);
		}
	}

	rc = len;

out:
	mutex_unlock(&dev->lock);
	return rc;
}

/**
 * show_filter() - shows the current scancode filter value or mask
 * @device:	the device descriptor
 * @attr:	the device attribute struct
 * @buf:	a pointer to the output buffer
 *
 * This routine is a callback routine to read a scancode filter value or mask.
 * It is trigged by reading /sys/class/rc/rc?/[wakeup_]filter[_mask].
 * It prints the current scancode filter value or mask of the appropriate filter
 * type in hexadecimal into @buf and returns the size of the buffer.
 *
 * Bits of the filter value corresponding to set bits in the filter mask are
 * compared against input scancodes and non-matching scancodes are discarded.
 *
 * dev->lock is taken to guard against races between
 * store_filter and show_filter.
 */
static ssize_t show_filter(struct device *device,
			   struct device_attribute *attr,
			   char *buf)
{
	struct rc_dev *dev = to_rc_dev(device);
	struct rc_filter_attribute *fattr = to_rc_filter_attr(attr);
	struct rc_scancode_filter *filter;
	u32 val;

	mutex_lock(&dev->lock);

	if (fattr->type == RC_FILTER_NORMAL)
		filter = &dev->scancode_filter;
	else
		filter = &dev->scancode_wakeup_filter;

	if (fattr->mask)
		val = filter->mask;
	else
		val = filter->data;
	mutex_unlock(&dev->lock);

	return sprintf(buf, "%#x\n", val);
}

/**
 * store_filter() - changes the scancode filter value
 * @device:	the device descriptor
 * @attr:	the device attribute struct
 * @buf:	a pointer to the input buffer
 * @len:	length of the input buffer
 *
 * This routine is for changing a scancode filter value or mask.
 * It is trigged by writing to /sys/class/rc/rc?/[wakeup_]filter[_mask].
 * Returns -EINVAL if an invalid filter value for the current protocol was
 * specified or if scancode filtering is not supported by the driver, otherwise
 * returns @len.
 *
 * Bits of the filter value corresponding to set bits in the filter mask are
 * compared against input scancodes and non-matching scancodes are discarded.
 *
 * dev->lock is taken to guard against races between
 * store_filter and show_filter.
 */
static ssize_t store_filter(struct device *device,
			    struct device_attribute *attr,
			    const char *buf, size_t len)
{
	struct rc_dev *dev = to_rc_dev(device);
	struct rc_filter_attribute *fattr = to_rc_filter_attr(attr);
	struct rc_scancode_filter new_filter, *filter;
	int ret;
	unsigned long val;
	int (*set_filter)(struct rc_dev *dev, struct rc_scancode_filter *filter);

	ret = kstrtoul(buf, 0, &val);
	if (ret < 0)
		return ret;

	if (fattr->type == RC_FILTER_NORMAL) {
		set_filter = dev->s_filter;
		filter = &dev->scancode_filter;
	} else {
		set_filter = dev->s_wakeup_filter;
		filter = &dev->scancode_wakeup_filter;
	}

	if (!set_filter)
		return -EINVAL;

	mutex_lock(&dev->lock);

	new_filter = *filter;
	if (fattr->mask)
		new_filter.mask = val;
	else
		new_filter.data = val;

	if (fattr->type == RC_FILTER_WAKEUP) {
		/*
		 * Refuse to set a filter unless a protocol is enabled
		 * and the filter is valid for that protocol
		 */
		if (dev->wakeup_protocol != RC_PROTO_UNKNOWN)
			ret = rc_validate_filter(dev, &new_filter);
		else
			ret = -EINVAL;

		if (ret != 0)
			goto unlock;
	}

	if (fattr->type == RC_FILTER_NORMAL && !dev->enabled_protocols &&
	    val) {
		/* refuse to set a filter unless a protocol is enabled */
		ret = -EINVAL;
		goto unlock;
	}

	ret = set_filter(dev, &new_filter);
	if (ret < 0)
		goto unlock;

	*filter = new_filter;

unlock:
	mutex_unlock(&dev->lock);
	return (ret < 0) ? ret : len;
}

/**
 * show_wakeup_protocols() - shows the wakeup IR protocol
 * @device:	the device descriptor
 * @mattr:	the device attribute struct
 * @buf:	a pointer to the output buffer
 *
 * This routine is a callback routine for input read the IR protocol type(s).
 * it is trigged by reading /sys/class/rc/rc?/wakeup_protocols.
 * It returns the protocol names of supported protocols.
 * The enabled protocols are printed in brackets.
 *
 * dev->lock is taken to guard against races between
 * store_wakeup_protocols and show_wakeup_protocols.
 */
static ssize_t show_wakeup_protocols(struct device *device,
				     struct device_attribute *mattr,
				     char *buf)
{
	struct rc_dev *dev = to_rc_dev(device);
	u64 allowed;
	enum rc_proto enabled;
	char *tmp = buf;
	int i;

	mutex_lock(&dev->lock);

	allowed = dev->allowed_wakeup_protocols;
	enabled = dev->wakeup_protocol;

	mutex_unlock(&dev->lock);

	IR_dprintk(1, "%s: allowed - 0x%llx, enabled - %d\n",
		   __func__, (long long)allowed, enabled);

	for (i = 0; i < ARRAY_SIZE(protocols); i++) {
		if (allowed & (1ULL << i)) {
			if (i == enabled)
				tmp += sprintf(tmp, "[%s] ", protocols[i].name);
			else
				tmp += sprintf(tmp, "%s ", protocols[i].name);
		}
	}

	if (tmp != buf)
		tmp--;
	*tmp = '\n';

	return tmp + 1 - buf;
}

/**
 * store_wakeup_protocols() - changes the wakeup IR protocol(s)
 * @device:	the device descriptor
 * @mattr:	the device attribute struct
 * @buf:	a pointer to the input buffer
 * @len:	length of the input buffer
 *
 * This routine is for changing the IR protocol type.
 * It is trigged by writing to /sys/class/rc/rc?/wakeup_protocols.
 * Returns @len on success or a negative error code.
 *
 * dev->lock is taken to guard against races between
 * store_wakeup_protocols and show_wakeup_protocols.
 */
static ssize_t store_wakeup_protocols(struct device *device,
				      struct device_attribute *mattr,
				      const char *buf, size_t len)
{
	struct rc_dev *dev = to_rc_dev(device);
	enum rc_proto protocol;
	ssize_t rc;
	u64 allowed;
	int i;

	mutex_lock(&dev->lock);

	allowed = dev->allowed_wakeup_protocols;

	if (sysfs_streq(buf, "none")) {
		protocol = RC_PROTO_UNKNOWN;
	} else {
		for (i = 0; i < ARRAY_SIZE(protocols); i++) {
			if ((allowed & (1ULL << i)) &&
			    sysfs_streq(buf, protocols[i].name)) {
				protocol = i;
				break;
			}
		}

		if (i == ARRAY_SIZE(protocols)) {
			rc = -EINVAL;
			goto out;
		}

		if (dev->encode_wakeup) {
			u64 mask = 1ULL << protocol;

			ir_raw_load_modules(&mask);
			if (!mask) {
				rc = -EINVAL;
				goto out;
			}
		}
	}

	if (dev->wakeup_protocol != protocol) {
		dev->wakeup_protocol = protocol;
		IR_dprintk(1, "Wakeup protocol changed to %d\n", protocol);

		if (protocol == RC_PROTO_RC6_MCE)
			dev->scancode_wakeup_filter.data = 0x800f0000;
		else
			dev->scancode_wakeup_filter.data = 0;
		dev->scancode_wakeup_filter.mask = 0;

		rc = dev->s_wakeup_filter(dev, &dev->scancode_wakeup_filter);
		if (rc == 0)
			rc = len;
	} else {
		rc = len;
	}

out:
	mutex_unlock(&dev->lock);
	return rc;
}

static void rc_dev_release(struct device *device)
{
	struct rc_dev *dev = to_rc_dev(device);

	kfree(dev);
}

#define ADD_HOTPLUG_VAR(fmt, val...)					\
	do {								\
		int err = add_uevent_var(env, fmt, val);		\
		if (err)						\
			return err;					\
	} while (0)

static int rc_dev_uevent(struct device *device, struct kobj_uevent_env *env)
{
	struct rc_dev *dev = to_rc_dev(device);

	if (dev->rc_map.name)
		ADD_HOTPLUG_VAR("NAME=%s", dev->rc_map.name);
	if (dev->driver_name)
		ADD_HOTPLUG_VAR("DRV_NAME=%s", dev->driver_name);
	if (dev->device_name)
		ADD_HOTPLUG_VAR("DEV_NAME=%s", dev->device_name);

	return 0;
}

/*
 * Static device attribute struct with the sysfs attributes for IR's
 */
static struct device_attribute dev_attr_ro_protocols =
__ATTR(protocols, 0444, show_protocols, NULL);
static struct device_attribute dev_attr_rw_protocols =
__ATTR(protocols, 0644, show_protocols, store_protocols);
static DEVICE_ATTR(wakeup_protocols, 0644, show_wakeup_protocols,
		   store_wakeup_protocols);
static RC_FILTER_ATTR(filter, S_IRUGO|S_IWUSR,
		      show_filter, store_filter, RC_FILTER_NORMAL, false);
static RC_FILTER_ATTR(filter_mask, S_IRUGO|S_IWUSR,
		      show_filter, store_filter, RC_FILTER_NORMAL, true);
static RC_FILTER_ATTR(wakeup_filter, S_IRUGO|S_IWUSR,
		      show_filter, store_filter, RC_FILTER_WAKEUP, false);
static RC_FILTER_ATTR(wakeup_filter_mask, S_IRUGO|S_IWUSR,
		      show_filter, store_filter, RC_FILTER_WAKEUP, true);

static struct attribute *rc_dev_rw_protocol_attrs[] = {
	&dev_attr_rw_protocols.attr,
	NULL,
};

static const struct attribute_group rc_dev_rw_protocol_attr_grp = {
	.attrs	= rc_dev_rw_protocol_attrs,
};

static struct attribute *rc_dev_ro_protocol_attrs[] = {
	&dev_attr_ro_protocols.attr,
	NULL,
};

static const struct attribute_group rc_dev_ro_protocol_attr_grp = {
	.attrs	= rc_dev_ro_protocol_attrs,
};

static struct attribute *rc_dev_filter_attrs[] = {
	&dev_attr_filter.attr.attr,
	&dev_attr_filter_mask.attr.attr,
	NULL,
};

static const struct attribute_group rc_dev_filter_attr_grp = {
	.attrs	= rc_dev_filter_attrs,
};

static struct attribute *rc_dev_wakeup_filter_attrs[] = {
	&dev_attr_wakeup_filter.attr.attr,
	&dev_attr_wakeup_filter_mask.attr.attr,
	&dev_attr_wakeup_protocols.attr,
	NULL,
};

static const struct attribute_group rc_dev_wakeup_filter_attr_grp = {
	.attrs	= rc_dev_wakeup_filter_attrs,
};

static const struct device_type rc_dev_type = {
	.release	= rc_dev_release,
	.uevent		= rc_dev_uevent,
};

struct rc_dev *rc_allocate_device(enum rc_driver_type type)
{
	struct rc_dev *dev;

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return NULL;

	if (type != RC_DRIVER_IR_RAW_TX) {
		dev->input_dev = input_allocate_device();
		if (!dev->input_dev) {
			kfree(dev);
			return NULL;
		}

		dev->input_dev->getkeycode = ir_getkeycode;
		dev->input_dev->setkeycode = ir_setkeycode;
		input_set_drvdata(dev->input_dev, dev);

		timer_setup(&dev->timer_keyup, ir_timer_keyup, 0);

		spin_lock_init(&dev->rc_map.lock);
		spin_lock_init(&dev->keylock);
	}
	mutex_init(&dev->lock);

	dev->dev.type = &rc_dev_type;
	dev->dev.class = &rc_class;
	device_initialize(&dev->dev);

	dev->driver_type = type;

	__module_get(THIS_MODULE);
	return dev;
}
EXPORT_SYMBOL_GPL(rc_allocate_device);

void rc_free_device(struct rc_dev *dev)
{
	if (!dev)
		return;

	input_free_device(dev->input_dev);

	put_device(&dev->dev);

	/* kfree(dev) will be called by the callback function
	   rc_dev_release() */

	module_put(THIS_MODULE);
}
EXPORT_SYMBOL_GPL(rc_free_device);

static void devm_rc_alloc_release(struct device *dev, void *res)
{
	rc_free_device(*(struct rc_dev **)res);
}

struct rc_dev *devm_rc_allocate_device(struct device *dev,
				       enum rc_driver_type type)
{
	struct rc_dev **dr, *rc;

	dr = devres_alloc(devm_rc_alloc_release, sizeof(*dr), GFP_KERNEL);
	if (!dr)
		return NULL;

	rc = rc_allocate_device(type);
	if (!rc) {
		devres_free(dr);
		return NULL;
	}

	rc->dev.parent = dev;
	rc->managed_alloc = true;
	*dr = rc;
	devres_add(dev, dr);

	return rc;
}
EXPORT_SYMBOL_GPL(devm_rc_allocate_device);

static int rc_prepare_rx_device(struct rc_dev *dev)
{
	int rc;
	struct rc_map *rc_map;
	u64 rc_proto;

	if (!dev->map_name)
		return -EINVAL;

	rc_map = rc_map_get(dev->map_name);
	if (!rc_map)
		rc_map = rc_map_get(RC_MAP_EMPTY);
	if (!rc_map || !rc_map->scan || rc_map->size == 0)
		return -EINVAL;

	rc = ir_setkeytable(dev, rc_map);
	if (rc)
		return rc;

	rc_proto = BIT_ULL(rc_map->rc_proto);

	if (dev->driver_type == RC_DRIVER_SCANCODE && !dev->change_protocol)
		dev->enabled_protocols = dev->allowed_protocols;

	if (dev->change_protocol) {
		rc = dev->change_protocol(dev, &rc_proto);
		if (rc < 0)
			goto out_table;
		dev->enabled_protocols = rc_proto;
	}

	if (dev->driver_type == RC_DRIVER_IR_RAW)
		ir_raw_load_modules(&rc_proto);

	set_bit(EV_KEY, dev->input_dev->evbit);
	set_bit(EV_REP, dev->input_dev->evbit);
	set_bit(EV_MSC, dev->input_dev->evbit);
	set_bit(MSC_SCAN, dev->input_dev->mscbit);
	if (dev->open)
		dev->input_dev->open = ir_open;
	if (dev->close)
		dev->input_dev->close = ir_close;

	dev->input_dev->dev.parent = &dev->dev;
	memcpy(&dev->input_dev->id, &dev->input_id, sizeof(dev->input_id));
	dev->input_dev->phys = dev->input_phys;
	dev->input_dev->name = dev->device_name;

	return 0;

out_table:
	ir_free_table(&dev->rc_map);

	return rc;
}

static int rc_setup_rx_device(struct rc_dev *dev)
{
	int rc;

	/* rc_open will be called here */
	rc = input_register_device(dev->input_dev);
	if (rc)
		return rc;

	/*
	 * Default delay of 250ms is too short for some protocols, especially
	 * since the timeout is currently set to 250ms. Increase it to 500ms,
	 * to avoid wrong repetition of the keycodes. Note that this must be
	 * set after the call to input_register_device().
	 */
	dev->input_dev->rep[REP_DELAY] = 500;

	/*
	 * As a repeat event on protocols like RC-5 and NEC take as long as
	 * 110/114ms, using 33ms as a repeat period is not the right thing
	 * to do.
	 */
	dev->input_dev->rep[REP_PERIOD] = 125;

	return 0;
}

static void rc_free_rx_device(struct rc_dev *dev)
{
	if (!dev)
		return;

	if (dev->input_dev) {
		input_unregister_device(dev->input_dev);
		dev->input_dev = NULL;
	}

	ir_free_table(&dev->rc_map);
}

int rc_register_device(struct rc_dev *dev)
{
	const char *path;
	int attr = 0;
	int minor;
	int rc;

	if (!dev)
		return -EINVAL;

	minor = ida_simple_get(&rc_ida, 0, RC_DEV_MAX, GFP_KERNEL);
	if (minor < 0)
		return minor;

	dev->minor = minor;
	dev_set_name(&dev->dev, "rc%u", dev->minor);
	dev_set_drvdata(&dev->dev, dev);

	dev->dev.groups = dev->sysfs_groups;
	if (dev->driver_type == RC_DRIVER_SCANCODE && !dev->change_protocol)
		dev->sysfs_groups[attr++] = &rc_dev_ro_protocol_attr_grp;
	else if (dev->driver_type != RC_DRIVER_IR_RAW_TX)
		dev->sysfs_groups[attr++] = &rc_dev_rw_protocol_attr_grp;
	if (dev->s_filter)
		dev->sysfs_groups[attr++] = &rc_dev_filter_attr_grp;
	if (dev->s_wakeup_filter)
		dev->sysfs_groups[attr++] = &rc_dev_wakeup_filter_attr_grp;
	dev->sysfs_groups[attr++] = NULL;

	if (dev->driver_type == RC_DRIVER_IR_RAW ||
	    dev->driver_type == RC_DRIVER_IR_RAW_TX) {
		rc = ir_raw_event_prepare(dev);
		if (rc < 0)
			goto out_minor;
	}

	if (dev->driver_type != RC_DRIVER_IR_RAW_TX) {
		rc = rc_prepare_rx_device(dev);
		if (rc)
			goto out_raw;
	}

	rc = device_add(&dev->dev);
	if (rc)
		goto out_rx_free;

	path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
	dev_info(&dev->dev, "%s as %s\n",
		 dev->device_name ?: "Unspecified device", path ?: "N/A");
	kfree(path);

	if (dev->driver_type != RC_DRIVER_IR_RAW_TX) {
		rc = rc_setup_rx_device(dev);
		if (rc)
			goto out_dev;
	}

	if (dev->driver_type == RC_DRIVER_IR_RAW ||
	    dev->driver_type == RC_DRIVER_IR_RAW_TX) {
		rc = ir_raw_event_register(dev);
		if (rc < 0)
			goto out_rx;
	}

	IR_dprintk(1, "Registered rc%u (driver: %s)\n",
		   dev->minor,
		   dev->driver_name ? dev->driver_name : "unknown");

	return 0;

out_rx:
	rc_free_rx_device(dev);
out_dev:
	device_del(&dev->dev);
out_rx_free:
	ir_free_table(&dev->rc_map);
out_raw:
	ir_raw_event_free(dev);
out_minor:
	ida_simple_remove(&rc_ida, minor);
	return rc;
}
EXPORT_SYMBOL_GPL(rc_register_device);

static void devm_rc_release(struct device *dev, void *res)
{
	rc_unregister_device(*(struct rc_dev **)res);
}

int devm_rc_register_device(struct device *parent, struct rc_dev *dev)
{
	struct rc_dev **dr;
	int ret;

	dr = devres_alloc(devm_rc_release, sizeof(*dr), GFP_KERNEL);
	if (!dr)
		return -ENOMEM;

	ret = rc_register_device(dev);
	if (ret) {
		devres_free(dr);
		return ret;
	}

	*dr = dev;
	devres_add(parent, dr);

	return 0;
}
EXPORT_SYMBOL_GPL(devm_rc_register_device);

void rc_unregister_device(struct rc_dev *dev)
{
	if (!dev)
		return;

	del_timer_sync(&dev->timer_keyup);

	if (dev->driver_type == RC_DRIVER_IR_RAW)
		ir_raw_event_unregister(dev);

	rc_free_rx_device(dev);

	device_del(&dev->dev);

	ida_simple_remove(&rc_ida, dev->minor);

	if (!dev->managed_alloc)
		rc_free_device(dev);
}

EXPORT_SYMBOL_GPL(rc_unregister_device);

/*
 * Init/exit code for the module. Basically, creates/removes /sys/class/rc
 */

static int __init rc_core_init(void)
{
	int rc = class_register(&rc_class);
	if (rc) {
		pr_err("rc_core: unable to register rc class\n");
		return rc;
	}

	led_trigger_register_simple("rc-feedback", &led_feedback);
	rc_map_register(&empty_map);

	return 0;
}

static void __exit rc_core_exit(void)
{
	class_unregister(&rc_class);
	led_trigger_unregister_simple(led_feedback);
	rc_map_unregister(&empty_map);
}

subsys_initcall(rc_core_init);
module_exit(rc_core_exit);

int rc_core_debug;    /* ir_debug level (0,1,2) */
EXPORT_SYMBOL_GPL(rc_core_debug);
module_param_named(debug, rc_core_debug, int, 0644);

MODULE_AUTHOR("Mauro Carvalho Chehab");
MODULE_LICENSE("GPL");