summaryrefslogtreecommitdiffstats
path: root/drivers/input/keyboard/applespi.c
blob: cf25177b4830167eb0241f10cc452c842a519a2c (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
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
// SPDX-License-Identifier: GPL-2.0
/*
 * MacBook (Pro) SPI keyboard and touchpad driver
 *
 * Copyright (c) 2015-2018 Federico Lorenzi
 * Copyright (c) 2017-2018 Ronald Tschalär
 */

/*
 * The keyboard and touchpad controller on the MacBookAir6, MacBookPro12,
 * MacBook8 and newer can be driven either by USB or SPI. However the USB
 * pins are only connected on the MacBookAir6 and 7 and the MacBookPro12.
 * All others need this driver. The interface is selected using ACPI methods:
 *
 * * UIEN ("USB Interface Enable"): If invoked with argument 1, disables SPI
 *   and enables USB. If invoked with argument 0, disables USB.
 * * UIST ("USB Interface Status"): Returns 1 if USB is enabled, 0 otherwise.
 * * SIEN ("SPI Interface Enable"): If invoked with argument 1, disables USB
 *   and enables SPI. If invoked with argument 0, disables SPI.
 * * SIST ("SPI Interface Status"): Returns 1 if SPI is enabled, 0 otherwise.
 * * ISOL: Resets the four GPIO pins used for SPI. Intended to be invoked with
 *   argument 1, then once more with argument 0.
 *
 * UIEN and UIST are only provided on models where the USB pins are connected.
 *
 * SPI-based Protocol
 * ------------------
 *
 * The device and driver exchange messages (struct message); each message is
 * encapsulated in one or more packets (struct spi_packet). There are two types
 * of exchanges: reads, and writes. A read is signaled by a GPE, upon which one
 * message can be read from the device. A write exchange consists of writing a
 * command message, immediately reading a short status packet, and then, upon
 * receiving a GPE, reading the response message. Write exchanges cannot be
 * interleaved, i.e. a new write exchange must not be started till the previous
 * write exchange is complete. Whether a received message is part of a read or
 * write exchange is indicated in the encapsulating packet's flags field.
 *
 * A single message may be too large to fit in a single packet (which has a
 * fixed, 256-byte size). In that case it will be split over multiple,
 * consecutive packets.
 */

#include <linux/acpi.h>
#include <linux/crc16.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/efi.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/ktime.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/spi/spi.h>
#include <linux/wait.h>
#include <linux/workqueue.h>

#include <asm/barrier.h>
#include <asm/unaligned.h>

#define CREATE_TRACE_POINTS
#include "applespi.h"
#include "applespi_trace.h"

#define APPLESPI_PACKET_SIZE	256
#define APPLESPI_STATUS_SIZE	4

#define PACKET_TYPE_READ	0x20
#define PACKET_TYPE_WRITE	0x40
#define PACKET_DEV_KEYB		0x01
#define PACKET_DEV_TPAD		0x02
#define PACKET_DEV_INFO		0xd0

#define MAX_ROLLOVER		6

#define MAX_FINGERS		11
#define MAX_FINGER_ORIENTATION	16384
#define MAX_PKTS_PER_MSG	2

#define KBD_BL_LEVEL_MIN	32U
#define KBD_BL_LEVEL_MAX	255U
#define KBD_BL_LEVEL_SCALE	1000000U
#define KBD_BL_LEVEL_ADJ	\
	((KBD_BL_LEVEL_MAX - KBD_BL_LEVEL_MIN) * KBD_BL_LEVEL_SCALE / 255U)

#define EFI_BL_LEVEL_NAME	L"KeyboardBacklightLevel"
#define EFI_BL_LEVEL_GUID	EFI_GUID(0xa076d2af, 0x9678, 0x4386, 0x8b, 0x58, 0x1f, 0xc8, 0xef, 0x04, 0x16, 0x19)

#define APPLE_FLAG_FKEY		0x01

#define SPI_RW_CHG_DELAY_US	100	/* from experimentation, in µs */

#define SYNAPTICS_VENDOR_ID	0x06cb

static unsigned int fnmode = 1;
module_param(fnmode, uint, 0644);
MODULE_PARM_DESC(fnmode, "Mode of Fn key on Apple keyboards (0 = disabled, [1] = fkeyslast, 2 = fkeysfirst)");

static unsigned int fnremap;
module_param(fnremap, uint, 0644);
MODULE_PARM_DESC(fnremap, "Remap Fn key ([0] = no-remap; 1 = left-ctrl, 2 = left-shift, 3 = left-alt, 4 = left-meta, 6 = right-shift, 7 = right-alt, 8 = right-meta)");

static bool iso_layout;
module_param(iso_layout, bool, 0644);
MODULE_PARM_DESC(iso_layout, "Enable/Disable hardcoded ISO-layout of the keyboard. ([0] = disabled, 1 = enabled)");

static char touchpad_dimensions[40];
module_param_string(touchpad_dimensions, touchpad_dimensions,
		    sizeof(touchpad_dimensions), 0444);
MODULE_PARM_DESC(touchpad_dimensions, "The pixel dimensions of the touchpad, as XxY+W+H .");

/**
 * struct keyboard_protocol - keyboard message.
 * message.type = 0x0110, message.length = 0x000a
 *
 * @unknown1:		unknown
 * @modifiers:		bit-set of modifier/control keys pressed
 * @unknown2:		unknown
 * @keys_pressed:	the (non-modifier) keys currently pressed
 * @fn_pressed:		whether the fn key is currently pressed
 * @crc16:		crc over the whole message struct (message header +
 *			this struct) minus this @crc16 field
 */
struct keyboard_protocol {
	u8			unknown1;
	u8			modifiers;
	u8			unknown2;
	u8			keys_pressed[MAX_ROLLOVER];
	u8			fn_pressed;
	__le16			crc16;
};

/**
 * struct tp_finger - single trackpad finger structure, le16-aligned
 *
 * @origin:		zero when switching track finger
 * @abs_x:		absolute x coordinate
 * @abs_y:		absolute y coordinate
 * @rel_x:		relative x coordinate
 * @rel_y:		relative y coordinate
 * @tool_major:		tool area, major axis
 * @tool_minor:		tool area, minor axis
 * @orientation:	16384 when point, else 15 bit angle
 * @touch_major:	touch area, major axis
 * @touch_minor:	touch area, minor axis
 * @unused:		zeros
 * @pressure:		pressure on forcetouch touchpad
 * @multi:		one finger: varies, more fingers: constant
 * @crc16:		on last finger: crc over the whole message struct
 *			(i.e. message header + this struct) minus the last
 *			@crc16 field; unknown on all other fingers.
 */
struct tp_finger {
	__le16 origin;
	__le16 abs_x;
	__le16 abs_y;
	__le16 rel_x;
	__le16 rel_y;
	__le16 tool_major;
	__le16 tool_minor;
	__le16 orientation;
	__le16 touch_major;
	__le16 touch_minor;
	__le16 unused[2];
	__le16 pressure;
	__le16 multi;
	__le16 crc16;
};

/**
 * struct touchpad_protocol - touchpad message.
 * message.type = 0x0210
 *
 * @unknown1:		unknown
 * @clicked:		1 if a button-click was detected, 0 otherwise
 * @unknown2:		unknown
 * @number_of_fingers:	the number of fingers being reported in @fingers
 * @clicked2:		same as @clicked
 * @unknown3:		unknown
 * @fingers:		the data for each finger
 */
struct touchpad_protocol {
	u8			unknown1[1];
	u8			clicked;
	u8			unknown2[28];
	u8			number_of_fingers;
	u8			clicked2;
	u8			unknown3[16];
	struct tp_finger	fingers[];
};

/**
 * struct command_protocol_tp_info - get touchpad info.
 * message.type = 0x1020, message.length = 0x0000
 *
 * @crc16:		crc over the whole message struct (message header +
 *			this struct) minus this @crc16 field
 */
struct command_protocol_tp_info {
	__le16			crc16;
};

/**
 * struct touchpad_info_protocol - touchpad info response.
 * message.type = 0x1020, message.length = 0x006e
 *
 * @unknown1:		unknown
 * @model_flags:	flags (vary by model number, but significance otherwise
 *			unknown)
 * @model_no:		the touchpad model number
 * @unknown2:		unknown
 * @crc16:		crc over the whole message struct (message header +
 *			this struct) minus this @crc16 field
 */
struct touchpad_info_protocol {
	u8			unknown1[105];
	u8			model_flags;
	u8			model_no;
	u8			unknown2[3];
	__le16			crc16;
};

/**
 * struct command_protocol_mt_init - initialize multitouch.
 * message.type = 0x0252, message.length = 0x0002
 *
 * @cmd:		value: 0x0102
 * @crc16:		crc over the whole message struct (message header +
 *			this struct) minus this @crc16 field
 */
struct command_protocol_mt_init {
	__le16			cmd;
	__le16			crc16;
};

/**
 * struct command_protocol_capsl - toggle caps-lock led
 * message.type = 0x0151, message.length = 0x0002
 *
 * @unknown:		value: 0x01 (length?)
 * @led:		0 off, 2 on
 * @crc16:		crc over the whole message struct (message header +
 *			this struct) minus this @crc16 field
 */
struct command_protocol_capsl {
	u8			unknown;
	u8			led;
	__le16			crc16;
};

/**
 * struct command_protocol_bl - set keyboard backlight brightness
 * message.type = 0xB051, message.length = 0x0006
 *
 * @const1:		value: 0x01B0
 * @level:		the brightness level to set
 * @const2:		value: 0x0001 (backlight off), 0x01F4 (backlight on)
 * @crc16:		crc over the whole message struct (message header +
 *			this struct) minus this @crc16 field
 */
struct command_protocol_bl {
	__le16			const1;
	__le16			level;
	__le16			const2;
	__le16			crc16;
};

/**
 * struct message - a complete spi message.
 *
 * Each message begins with fixed header, followed by a message-type specific
 * payload, and ends with a 16-bit crc. Because of the varying lengths of the
 * payload, the crc is defined at the end of each payload struct, rather than
 * in this struct.
 *
 * @type:	the message type
 * @zero:	always 0
 * @counter:	incremented on each message, rolls over after 255; there is a
 *		separate counter for each message type.
 * @rsp_buf_len:response buffer length (the exact nature of this field is quite
 *		speculative). On a request/write this is often the same as
 *		@length, though in some cases it has been seen to be much larger
 *		(e.g. 0x400); on a response/read this the same as on the
 *		request; for reads that are not responses it is 0.
 * @length:	length of the remainder of the data in the whole message
 *		structure (after re-assembly in case of being split over
 *		multiple spi-packets), minus the trailing crc. The total size
 *		of the message struct is therefore @length + 10.
 *
 * @keyboard:		Keyboard message
 * @touchpad:		Touchpad message
 * @tp_info:		Touchpad info (response)
 * @tp_info_command:	Touchpad info (CRC)
 * @init_mt_command:	Initialise Multitouch
 * @capsl_command:	Toggle caps-lock LED
 * @bl_command:		Keyboard brightness
 * @data:		Buffer data
 */
struct message {
	__le16		type;
	u8		zero;
	u8		counter;
	__le16		rsp_buf_len;
	__le16		length;
	union {
		struct keyboard_protocol	keyboard;
		struct touchpad_protocol	touchpad;
		struct touchpad_info_protocol	tp_info;
		struct command_protocol_tp_info	tp_info_command;
		struct command_protocol_mt_init	init_mt_command;
		struct command_protocol_capsl	capsl_command;
		struct command_protocol_bl	bl_command;
		DECLARE_FLEX_ARRAY(u8, 		data);
	};
};

/* type + zero + counter + rsp_buf_len + length */
#define MSG_HEADER_SIZE		8

/**
 * struct spi_packet - a complete spi packet; always 256 bytes. This carries
 * the (parts of the) message in the data. But note that this does not
 * necessarily contain a complete message, as in some cases (e.g. many
 * fingers pressed) the message is split over multiple packets (see the
 * @offset, @remaining, and @length fields). In general the data parts in
 * spi_packet's are concatenated until @remaining is 0, and the result is an
 * message.
 *
 * @flags:	0x40 = write (to device), 0x20 = read (from device); note that
 *		the response to a write still has 0x40.
 * @device:	1 = keyboard, 2 = touchpad
 * @offset:	specifies the offset of this packet's data in the complete
 *		message; i.e. > 0 indicates this is a continuation packet (in
 *		the second packet for a message split over multiple packets
 *		this would then be the same as the @length in the first packet)
 * @remaining:	number of message bytes remaining in subsequents packets (in
 *		the first packet of a message split over two packets this would
 *		then be the same as the @length in the second packet)
 * @length:	length of the valid data in the @data in this packet
 * @data:	all or part of a message
 * @crc16:	crc over this whole structure minus this @crc16 field. This
 *		covers just this packet, even on multi-packet messages (in
 *		contrast to the crc in the message).
 */
struct spi_packet {
	u8			flags;
	u8			device;
	__le16			offset;
	__le16			remaining;
	__le16			length;
	u8			data[246];
	__le16			crc16;
};

struct spi_settings {
	u64	spi_cs_delay;		/* cs-to-clk delay in us */
	u64	reset_a2r_usec;		/* active-to-receive delay? */
	u64	reset_rec_usec;		/* ? (cur val: 10) */
};

/* this mimics struct drm_rect */
struct applespi_tp_info {
	int	x_min;
	int	y_min;
	int	x_max;
	int	y_max;
};

struct applespi_data {
	struct spi_device		*spi;
	struct spi_settings		spi_settings;
	struct input_dev		*keyboard_input_dev;
	struct input_dev		*touchpad_input_dev;

	u8				*tx_buffer;
	u8				*tx_status;
	u8				*rx_buffer;

	u8				*msg_buf;
	unsigned int			saved_msg_len;

	struct applespi_tp_info		tp_info;

	u8				last_keys_pressed[MAX_ROLLOVER];
	u8				last_keys_fn_pressed[MAX_ROLLOVER];
	u8				last_fn_pressed;
	struct input_mt_pos		pos[MAX_FINGERS];
	int				slots[MAX_FINGERS];
	int				gpe;
	acpi_handle			sien;
	acpi_handle			sist;

	struct spi_transfer		dl_t;
	struct spi_transfer		rd_t;
	struct spi_message		rd_m;

	struct spi_transfer		ww_t;
	struct spi_transfer		wd_t;
	struct spi_transfer		wr_t;
	struct spi_transfer		st_t;
	struct spi_message		wr_m;

	bool				want_tp_info_cmd;
	bool				want_mt_init_cmd;
	bool				want_cl_led_on;
	bool				have_cl_led_on;
	unsigned int			want_bl_level;
	unsigned int			have_bl_level;
	unsigned int			cmd_msg_cntr;
	/* lock to protect the above parameters and flags below */
	spinlock_t			cmd_msg_lock;
	ktime_t				cmd_msg_queued;
	enum applespi_evt_type		cmd_evt_type;

	struct led_classdev		backlight_info;

	bool				suspended;
	bool				drain;
	wait_queue_head_t		drain_complete;
	bool				read_active;
	bool				write_active;

	struct work_struct		work;
	struct touchpad_info_protocol	rcvd_tp_info;

	struct dentry			*debugfs_root;
	bool				debug_tp_dim;
	char				tp_dim_val[40];
	int				tp_dim_min_x;
	int				tp_dim_max_x;
	int				tp_dim_min_y;
	int				tp_dim_max_y;
};

static const unsigned char applespi_scancodes[] = {
	0, 0, 0, 0,
	KEY_A, KEY_B, KEY_C, KEY_D, KEY_E, KEY_F, KEY_G, KEY_H, KEY_I, KEY_J,
	KEY_K, KEY_L, KEY_M, KEY_N, KEY_O, KEY_P, KEY_Q, KEY_R, KEY_S, KEY_T,
	KEY_U, KEY_V, KEY_W, KEY_X, KEY_Y, KEY_Z,
	KEY_1, KEY_2, KEY_3, KEY_4, KEY_5, KEY_6, KEY_7, KEY_8, KEY_9, KEY_0,
	KEY_ENTER, KEY_ESC, KEY_BACKSPACE, KEY_TAB, KEY_SPACE, KEY_MINUS,
	KEY_EQUAL, KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, 0,
	KEY_SEMICOLON, KEY_APOSTROPHE, KEY_GRAVE, KEY_COMMA, KEY_DOT, KEY_SLASH,
	KEY_CAPSLOCK,
	KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7, KEY_F8, KEY_F9,
	KEY_F10, KEY_F11, KEY_F12, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	KEY_RIGHT, KEY_LEFT, KEY_DOWN, KEY_UP,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_102ND,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_RO, 0, KEY_YEN, 0, 0, 0, 0, 0,
	0, KEY_KATAKANAHIRAGANA, KEY_MUHENKAN
};

/*
 * This must have exactly as many entries as there are bits in
 * struct keyboard_protocol.modifiers .
 */
static const unsigned char applespi_controlcodes[] = {
	KEY_LEFTCTRL,
	KEY_LEFTSHIFT,
	KEY_LEFTALT,
	KEY_LEFTMETA,
	0,
	KEY_RIGHTSHIFT,
	KEY_RIGHTALT,
	KEY_RIGHTMETA
};

struct applespi_key_translation {
	u16 from;
	u16 to;
	u8 flags;
};

static const struct applespi_key_translation applespi_fn_codes[] = {
	{ KEY_BACKSPACE, KEY_DELETE },
	{ KEY_ENTER,	KEY_INSERT },
	{ KEY_F1,	KEY_BRIGHTNESSDOWN,	APPLE_FLAG_FKEY },
	{ KEY_F2,	KEY_BRIGHTNESSUP,	APPLE_FLAG_FKEY },
	{ KEY_F3,	KEY_SCALE,		APPLE_FLAG_FKEY },
	{ KEY_F4,	KEY_DASHBOARD,		APPLE_FLAG_FKEY },
	{ KEY_F5,	KEY_KBDILLUMDOWN,	APPLE_FLAG_FKEY },
	{ KEY_F6,	KEY_KBDILLUMUP,		APPLE_FLAG_FKEY },
	{ KEY_F7,	KEY_PREVIOUSSONG,	APPLE_FLAG_FKEY },
	{ KEY_F8,	KEY_PLAYPAUSE,		APPLE_FLAG_FKEY },
	{ KEY_F9,	KEY_NEXTSONG,		APPLE_FLAG_FKEY },
	{ KEY_F10,	KEY_MUTE,		APPLE_FLAG_FKEY },
	{ KEY_F11,	KEY_VOLUMEDOWN,		APPLE_FLAG_FKEY },
	{ KEY_F12,	KEY_VOLUMEUP,		APPLE_FLAG_FKEY },
	{ KEY_RIGHT,	KEY_END },
	{ KEY_LEFT,	KEY_HOME },
	{ KEY_DOWN,	KEY_PAGEDOWN },
	{ KEY_UP,	KEY_PAGEUP },
	{ }
};

static const struct applespi_key_translation apple_iso_keyboard[] = {
	{ KEY_GRAVE,	KEY_102ND },
	{ KEY_102ND,	KEY_GRAVE },
	{ }
};

struct applespi_tp_model_info {
	u16			model;
	struct applespi_tp_info	tp_info;
};

static const struct applespi_tp_model_info applespi_tp_models[] = {
	{
		.model = 0x04,	/* MB8 MB9 MB10 */
		.tp_info = { -5087, -182, 5579, 6089 },
	},
	{
		.model = 0x05,	/* MBP13,1 MBP13,2 MBP14,1 MBP14,2 */
		.tp_info = { -6243, -170, 6749, 7685 },
	},
	{
		.model = 0x06,	/* MBP13,3 MBP14,3 */
		.tp_info = { -7456, -163, 7976, 9283 },
	},
	{}
};

typedef void (*applespi_trace_fun)(enum applespi_evt_type,
				   enum applespi_pkt_type, u8 *, size_t);

static applespi_trace_fun applespi_get_trace_fun(enum applespi_evt_type type)
{
	switch (type) {
	case ET_CMD_TP_INI:
		return trace_applespi_tp_ini_cmd;
	case ET_CMD_BL:
		return trace_applespi_backlight_cmd;
	case ET_CMD_CL:
		return trace_applespi_caps_lock_cmd;
	case ET_RD_KEYB:
		return trace_applespi_keyboard_data;
	case ET_RD_TPAD:
		return trace_applespi_touchpad_data;
	case ET_RD_UNKN:
		return trace_applespi_unknown_data;
	default:
		WARN_ONCE(1, "Unknown msg type %d", type);
		return trace_applespi_unknown_data;
	}
}

static void applespi_setup_read_txfrs(struct applespi_data *applespi)
{
	struct spi_message *msg = &applespi->rd_m;
	struct spi_transfer *dl_t = &applespi->dl_t;
	struct spi_transfer *rd_t = &applespi->rd_t;

	memset(dl_t, 0, sizeof(*dl_t));
	memset(rd_t, 0, sizeof(*rd_t));

	dl_t->delay.value = applespi->spi_settings.spi_cs_delay;
	dl_t->delay.unit = SPI_DELAY_UNIT_USECS;

	rd_t->rx_buf = applespi->rx_buffer;
	rd_t->len = APPLESPI_PACKET_SIZE;

	spi_message_init(msg);
	spi_message_add_tail(dl_t, msg);
	spi_message_add_tail(rd_t, msg);
}

static void applespi_setup_write_txfrs(struct applespi_data *applespi)
{
	struct spi_message *msg = &applespi->wr_m;
	struct spi_transfer *wt_t = &applespi->ww_t;
	struct spi_transfer *dl_t = &applespi->wd_t;
	struct spi_transfer *wr_t = &applespi->wr_t;
	struct spi_transfer *st_t = &applespi->st_t;

	memset(wt_t, 0, sizeof(*wt_t));
	memset(dl_t, 0, sizeof(*dl_t));
	memset(wr_t, 0, sizeof(*wr_t));
	memset(st_t, 0, sizeof(*st_t));

	/*
	 * All we need here is a delay at the beginning of the message before
	 * asserting cs. But the current spi API doesn't support this, so we
	 * end up with an extra unnecessary (but harmless) cs assertion and
	 * deassertion.
	 */
	wt_t->delay.value = SPI_RW_CHG_DELAY_US;
	wt_t->delay.unit = SPI_DELAY_UNIT_USECS;
	wt_t->cs_change = 1;

	dl_t->delay.value = applespi->spi_settings.spi_cs_delay;
	dl_t->delay.unit = SPI_DELAY_UNIT_USECS;

	wr_t->tx_buf = applespi->tx_buffer;
	wr_t->len = APPLESPI_PACKET_SIZE;
	wr_t->delay.value = SPI_RW_CHG_DELAY_US;
	wr_t->delay.unit = SPI_DELAY_UNIT_USECS;

	st_t->rx_buf = applespi->tx_status;
	st_t->len = APPLESPI_STATUS_SIZE;

	spi_message_init(msg);
	spi_message_add_tail(wt_t, msg);
	spi_message_add_tail(dl_t, msg);
	spi_message_add_tail(wr_t, msg);
	spi_message_add_tail(st_t, msg);
}

static int applespi_async(struct applespi_data *applespi,
			  struct spi_message *message, void (*complete)(void *))
{
	message->complete = complete;
	message->context = applespi;

	return spi_async(applespi->spi, message);
}

static inline bool applespi_check_write_status(struct applespi_data *applespi,
					       int sts)
{
	static u8 status_ok[] = { 0xac, 0x27, 0x68, 0xd5 };

	if (sts < 0) {
		dev_warn(&applespi->spi->dev, "Error writing to device: %d\n",
			 sts);
		return false;
	}

	if (memcmp(applespi->tx_status, status_ok, APPLESPI_STATUS_SIZE)) {
		dev_warn(&applespi->spi->dev, "Error writing to device: %*ph\n",
			 APPLESPI_STATUS_SIZE, applespi->tx_status);
		return false;
	}

	return true;
}

static int applespi_get_spi_settings(struct applespi_data *applespi)
{
	struct acpi_device *adev = ACPI_COMPANION(&applespi->spi->dev);
	const union acpi_object *o;
	struct spi_settings *settings = &applespi->spi_settings;

	if (!acpi_dev_get_property(adev, "spiCSDelay", ACPI_TYPE_BUFFER, &o))
		settings->spi_cs_delay = *(u64 *)o->buffer.pointer;
	else
		dev_warn(&applespi->spi->dev,
			 "Property spiCSDelay not found\n");

	if (!acpi_dev_get_property(adev, "resetA2RUsec", ACPI_TYPE_BUFFER, &o))
		settings->reset_a2r_usec = *(u64 *)o->buffer.pointer;
	else
		dev_warn(&applespi->spi->dev,
			 "Property resetA2RUsec not found\n");

	if (!acpi_dev_get_property(adev, "resetRecUsec", ACPI_TYPE_BUFFER, &o))
		settings->reset_rec_usec = *(u64 *)o->buffer.pointer;
	else
		dev_warn(&applespi->spi->dev,
			 "Property resetRecUsec not found\n");

	dev_dbg(&applespi->spi->dev,
		"SPI settings: spi_cs_delay=%llu reset_a2r_usec=%llu reset_rec_usec=%llu\n",
		settings->spi_cs_delay, settings->reset_a2r_usec,
		settings->reset_rec_usec);

	return 0;
}

static int applespi_setup_spi(struct applespi_data *applespi)
{
	int sts;

	sts = applespi_get_spi_settings(applespi);
	if (sts)
		return sts;

	spin_lock_init(&applespi->cmd_msg_lock);
	init_waitqueue_head(&applespi->drain_complete);

	return 0;
}

static int applespi_enable_spi(struct applespi_data *applespi)
{
	acpi_status acpi_sts;
	unsigned long long spi_status;

	/* check if SPI is already enabled, so we can skip the delay below */
	acpi_sts = acpi_evaluate_integer(applespi->sist, NULL, NULL,
					 &spi_status);
	if (ACPI_SUCCESS(acpi_sts) && spi_status)
		return 0;

	/* SIEN(1) will enable SPI communication */
	acpi_sts = acpi_execute_simple_method(applespi->sien, NULL, 1);
	if (ACPI_FAILURE(acpi_sts)) {
		dev_err(&applespi->spi->dev, "SIEN failed: %s\n",
			acpi_format_exception(acpi_sts));
		return -ENODEV;
	}

	/*
	 * Allow the SPI interface to come up before returning. Without this
	 * delay, the SPI commands to enable multitouch mode may not reach
	 * the trackpad controller, causing pointer movement to break upon
	 * resume from sleep.
	 */
	msleep(50);

	return 0;
}

static int applespi_send_cmd_msg(struct applespi_data *applespi);

static void applespi_msg_complete(struct applespi_data *applespi,
				  bool is_write_msg, bool is_read_compl)
{
	unsigned long flags;

	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);

	if (is_read_compl)
		applespi->read_active = false;
	if (is_write_msg)
		applespi->write_active = false;

	if (applespi->drain && !applespi->write_active)
		wake_up_all(&applespi->drain_complete);

	if (is_write_msg) {
		applespi->cmd_msg_queued = 0;
		applespi_send_cmd_msg(applespi);
	}

	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);
}

static void applespi_async_write_complete(void *context)
{
	struct applespi_data *applespi = context;
	enum applespi_evt_type evt_type = applespi->cmd_evt_type;

	applespi_get_trace_fun(evt_type)(evt_type, PT_WRITE,
					 applespi->tx_buffer,
					 APPLESPI_PACKET_SIZE);
	applespi_get_trace_fun(evt_type)(evt_type, PT_STATUS,
					 applespi->tx_status,
					 APPLESPI_STATUS_SIZE);

	udelay(SPI_RW_CHG_DELAY_US);

	if (!applespi_check_write_status(applespi, applespi->wr_m.status)) {
		/*
		 * If we got an error, we presumably won't get the expected
		 * response message either.
		 */
		applespi_msg_complete(applespi, true, false);
	}
}

static int applespi_send_cmd_msg(struct applespi_data *applespi)
{
	u16 crc;
	int sts;
	struct spi_packet *packet = (struct spi_packet *)applespi->tx_buffer;
	struct message *message = (struct message *)packet->data;
	u16 msg_len;
	u8 device;

	/* check if draining */
	if (applespi->drain)
		return 0;

	/* check whether send is in progress */
	if (applespi->cmd_msg_queued) {
		if (ktime_ms_delta(ktime_get(), applespi->cmd_msg_queued) < 1000)
			return 0;

		dev_warn(&applespi->spi->dev, "Command %d timed out\n",
			 applespi->cmd_evt_type);

		applespi->cmd_msg_queued = 0;
		applespi->write_active = false;
	}

	/* set up packet */
	memset(packet, 0, APPLESPI_PACKET_SIZE);

	/* are we processing init commands? */
	if (applespi->want_tp_info_cmd) {
		applespi->want_tp_info_cmd = false;
		applespi->want_mt_init_cmd = true;
		applespi->cmd_evt_type = ET_CMD_TP_INI;

		/* build init command */
		device = PACKET_DEV_INFO;

		message->type = cpu_to_le16(0x1020);
		msg_len = sizeof(message->tp_info_command);

		message->zero = 0x02;
		message->rsp_buf_len = cpu_to_le16(0x0200);

	} else if (applespi->want_mt_init_cmd) {
		applespi->want_mt_init_cmd = false;
		applespi->cmd_evt_type = ET_CMD_TP_INI;

		/* build init command */
		device = PACKET_DEV_TPAD;

		message->type = cpu_to_le16(0x0252);
		msg_len = sizeof(message->init_mt_command);

		message->init_mt_command.cmd = cpu_to_le16(0x0102);

	/* do we need caps-lock command? */
	} else if (applespi->want_cl_led_on != applespi->have_cl_led_on) {
		applespi->have_cl_led_on = applespi->want_cl_led_on;
		applespi->cmd_evt_type = ET_CMD_CL;

		/* build led command */
		device = PACKET_DEV_KEYB;

		message->type = cpu_to_le16(0x0151);
		msg_len = sizeof(message->capsl_command);

		message->capsl_command.unknown = 0x01;
		message->capsl_command.led = applespi->have_cl_led_on ? 2 : 0;

	/* do we need backlight command? */
	} else if (applespi->want_bl_level != applespi->have_bl_level) {
		applespi->have_bl_level = applespi->want_bl_level;
		applespi->cmd_evt_type = ET_CMD_BL;

		/* build command buffer */
		device = PACKET_DEV_KEYB;

		message->type = cpu_to_le16(0xB051);
		msg_len = sizeof(message->bl_command);

		message->bl_command.const1 = cpu_to_le16(0x01B0);
		message->bl_command.level =
				cpu_to_le16(applespi->have_bl_level);

		if (applespi->have_bl_level > 0)
			message->bl_command.const2 = cpu_to_le16(0x01F4);
		else
			message->bl_command.const2 = cpu_to_le16(0x0001);

	/* everything's up-to-date */
	} else {
		return 0;
	}

	/* finalize packet */
	packet->flags = PACKET_TYPE_WRITE;
	packet->device = device;
	packet->length = cpu_to_le16(MSG_HEADER_SIZE + msg_len);

	message->counter = applespi->cmd_msg_cntr++ % (U8_MAX + 1);

	message->length = cpu_to_le16(msg_len - 2);
	if (!message->rsp_buf_len)
		message->rsp_buf_len = message->length;

	crc = crc16(0, (u8 *)message, le16_to_cpu(packet->length) - 2);
	put_unaligned_le16(crc, &message->data[msg_len - 2]);

	crc = crc16(0, (u8 *)packet, sizeof(*packet) - 2);
	packet->crc16 = cpu_to_le16(crc);

	/* send command */
	sts = applespi_async(applespi, &applespi->wr_m,
			     applespi_async_write_complete);
	if (sts) {
		dev_warn(&applespi->spi->dev,
			 "Error queueing async write to device: %d\n", sts);
		return sts;
	}

	applespi->cmd_msg_queued = ktime_get_coarse();
	applespi->write_active = true;

	return 0;
}

static void applespi_init(struct applespi_data *applespi, bool is_resume)
{
	unsigned long flags;

	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);

	if (is_resume)
		applespi->want_mt_init_cmd = true;
	else
		applespi->want_tp_info_cmd = true;
	applespi_send_cmd_msg(applespi);

	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);
}

static int applespi_set_capsl_led(struct applespi_data *applespi,
				  bool capslock_on)
{
	unsigned long flags;
	int sts;

	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);

	applespi->want_cl_led_on = capslock_on;
	sts = applespi_send_cmd_msg(applespi);

	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);

	return sts;
}

static void applespi_set_bl_level(struct led_classdev *led_cdev,
				  enum led_brightness value)
{
	struct applespi_data *applespi =
		container_of(led_cdev, struct applespi_data, backlight_info);
	unsigned long flags;

	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);

	if (value == 0) {
		applespi->want_bl_level = value;
	} else {
		/*
		 * The backlight does not turn on till level 32, so we scale
		 * the range here so that from a user's perspective it turns
		 * on at 1.
		 */
		applespi->want_bl_level =
			((value * KBD_BL_LEVEL_ADJ) / KBD_BL_LEVEL_SCALE +
			 KBD_BL_LEVEL_MIN);
	}

	applespi_send_cmd_msg(applespi);

	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);
}

static int applespi_event(struct input_dev *dev, unsigned int type,
			  unsigned int code, int value)
{
	struct applespi_data *applespi = input_get_drvdata(dev);

	switch (type) {
	case EV_LED:
		applespi_set_capsl_led(applespi, !!test_bit(LED_CAPSL, dev->led));
		return 0;
	}

	return -EINVAL;
}

/* lifted from the BCM5974 driver and renamed from raw2int */
/* convert 16-bit little endian to signed integer */
static inline int le16_to_int(__le16 x)
{
	return (signed short)le16_to_cpu(x);
}

static void applespi_debug_update_dimensions(struct applespi_data *applespi,
					     const struct tp_finger *f)
{
	applespi->tp_dim_min_x = min(applespi->tp_dim_min_x,
				     le16_to_int(f->abs_x));
	applespi->tp_dim_max_x = max(applespi->tp_dim_max_x,
				     le16_to_int(f->abs_x));
	applespi->tp_dim_min_y = min(applespi->tp_dim_min_y,
				     le16_to_int(f->abs_y));
	applespi->tp_dim_max_y = max(applespi->tp_dim_max_y,
				     le16_to_int(f->abs_y));
}

static int applespi_tp_dim_open(struct inode *inode, struct file *file)
{
	struct applespi_data *applespi = inode->i_private;

	file->private_data = applespi;

	snprintf(applespi->tp_dim_val, sizeof(applespi->tp_dim_val),
		 "0x%.4x %dx%d+%u+%u\n",
		 applespi->touchpad_input_dev->id.product,
		 applespi->tp_dim_min_x, applespi->tp_dim_min_y,
		 applespi->tp_dim_max_x - applespi->tp_dim_min_x,
		 applespi->tp_dim_max_y - applespi->tp_dim_min_y);

	return nonseekable_open(inode, file);
}

static ssize_t applespi_tp_dim_read(struct file *file, char __user *buf,
				    size_t len, loff_t *off)
{
	struct applespi_data *applespi = file->private_data;

	return simple_read_from_buffer(buf, len, off, applespi->tp_dim_val,
				       strlen(applespi->tp_dim_val));
}

static const struct file_operations applespi_tp_dim_fops = {
	.owner = THIS_MODULE,
	.open = applespi_tp_dim_open,
	.read = applespi_tp_dim_read,
	.llseek = no_llseek,
};

static void report_finger_data(struct input_dev *input, int slot,
			       const struct input_mt_pos *pos,
			       const struct tp_finger *f)
{
	input_mt_slot(input, slot);
	input_mt_report_slot_state(input, MT_TOOL_FINGER, true);

	input_report_abs(input, ABS_MT_TOUCH_MAJOR,
			 le16_to_int(f->touch_major) << 1);
	input_report_abs(input, ABS_MT_TOUCH_MINOR,
			 le16_to_int(f->touch_minor) << 1);
	input_report_abs(input, ABS_MT_WIDTH_MAJOR,
			 le16_to_int(f->tool_major) << 1);
	input_report_abs(input, ABS_MT_WIDTH_MINOR,
			 le16_to_int(f->tool_minor) << 1);
	input_report_abs(input, ABS_MT_ORIENTATION,
			 MAX_FINGER_ORIENTATION - le16_to_int(f->orientation));
	input_report_abs(input, ABS_MT_POSITION_X, pos->x);
	input_report_abs(input, ABS_MT_POSITION_Y, pos->y);
}

static void report_tp_state(struct applespi_data *applespi,
			    struct touchpad_protocol *t)
{
	const struct tp_finger *f;
	struct input_dev *input;
	const struct applespi_tp_info *tp_info = &applespi->tp_info;
	int i, n;

	/* touchpad_input_dev is set async in worker */
	input = smp_load_acquire(&applespi->touchpad_input_dev);
	if (!input)
		return;	/* touchpad isn't initialized yet */

	n = 0;

	for (i = 0; i < t->number_of_fingers; i++) {
		f = &t->fingers[i];
		if (le16_to_int(f->touch_major) == 0)
			continue;
		applespi->pos[n].x = le16_to_int(f->abs_x);
		applespi->pos[n].y = tp_info->y_min + tp_info->y_max -
				     le16_to_int(f->abs_y);
		n++;

		if (applespi->debug_tp_dim)
			applespi_debug_update_dimensions(applespi, f);
	}

	input_mt_assign_slots(input, applespi->slots, applespi->pos, n, 0);

	for (i = 0; i < n; i++)
		report_finger_data(input, applespi->slots[i],
				   &applespi->pos[i], &t->fingers[i]);

	input_mt_sync_frame(input);
	input_report_key(input, BTN_LEFT, t->clicked);

	input_sync(input);
}

static const struct applespi_key_translation *
applespi_find_translation(const struct applespi_key_translation *table, u16 key)
{
	const struct applespi_key_translation *trans;

	for (trans = table; trans->from; trans++)
		if (trans->from == key)
			return trans;

	return NULL;
}

static unsigned int applespi_translate_fn_key(unsigned int key, int fn_pressed)
{
	const struct applespi_key_translation *trans;
	int do_translate;

	trans = applespi_find_translation(applespi_fn_codes, key);
	if (trans) {
		if (trans->flags & APPLE_FLAG_FKEY)
			do_translate = (fnmode == 2 && fn_pressed) ||
				       (fnmode == 1 && !fn_pressed);
		else
			do_translate = fn_pressed;

		if (do_translate)
			key = trans->to;
	}

	return key;
}

static unsigned int applespi_translate_iso_layout(unsigned int key)
{
	const struct applespi_key_translation *trans;

	trans = applespi_find_translation(apple_iso_keyboard, key);
	if (trans)
		key = trans->to;

	return key;
}

static unsigned int applespi_code_to_key(u8 code, int fn_pressed)
{
	unsigned int key = applespi_scancodes[code];

	if (fnmode)
		key = applespi_translate_fn_key(key, fn_pressed);
	if (iso_layout)
		key = applespi_translate_iso_layout(key);
	return key;
}

static void
applespi_remap_fn_key(struct keyboard_protocol *keyboard_protocol)
{
	unsigned char tmp;
	u8 bit = BIT((fnremap - 1) & 0x07);

	if (!fnremap || fnremap > ARRAY_SIZE(applespi_controlcodes) ||
	    !applespi_controlcodes[fnremap - 1])
		return;

	tmp = keyboard_protocol->fn_pressed;
	keyboard_protocol->fn_pressed = !!(keyboard_protocol->modifiers & bit);
	if (tmp)
		keyboard_protocol->modifiers |= bit;
	else
		keyboard_protocol->modifiers &= ~bit;
}

static void
applespi_handle_keyboard_event(struct applespi_data *applespi,
			       struct keyboard_protocol *keyboard_protocol)
{
	unsigned int key;
	int i;

	compiletime_assert(ARRAY_SIZE(applespi_controlcodes) ==
			   sizeof_field(struct keyboard_protocol, modifiers) * 8,
			   "applespi_controlcodes has wrong number of entries");

	/* check for rollover overflow, which is signalled by all keys == 1 */
	if (!memchr_inv(keyboard_protocol->keys_pressed, 1, MAX_ROLLOVER))
		return;

	/* remap fn key if desired */
	applespi_remap_fn_key(keyboard_protocol);

	/* check released keys */
	for (i = 0; i < MAX_ROLLOVER; i++) {
		if (memchr(keyboard_protocol->keys_pressed,
			   applespi->last_keys_pressed[i], MAX_ROLLOVER))
			continue;	/* key is still pressed */

		key = applespi_code_to_key(applespi->last_keys_pressed[i],
					   applespi->last_keys_fn_pressed[i]);
		input_report_key(applespi->keyboard_input_dev, key, 0);
		applespi->last_keys_fn_pressed[i] = 0;
	}

	/* check pressed keys */
	for (i = 0; i < MAX_ROLLOVER; i++) {
		if (keyboard_protocol->keys_pressed[i] <
				ARRAY_SIZE(applespi_scancodes) &&
		    keyboard_protocol->keys_pressed[i] > 0) {
			key = applespi_code_to_key(
					keyboard_protocol->keys_pressed[i],
					keyboard_protocol->fn_pressed);
			input_report_key(applespi->keyboard_input_dev, key, 1);
			applespi->last_keys_fn_pressed[i] =
					keyboard_protocol->fn_pressed;
		}
	}

	/* check control keys */
	for (i = 0; i < ARRAY_SIZE(applespi_controlcodes); i++) {
		if (keyboard_protocol->modifiers & BIT(i))
			input_report_key(applespi->keyboard_input_dev,
					 applespi_controlcodes[i], 1);
		else
			input_report_key(applespi->keyboard_input_dev,
					 applespi_controlcodes[i], 0);
	}

	/* check function key */
	if (keyboard_protocol->fn_pressed && !applespi->last_fn_pressed)
		input_report_key(applespi->keyboard_input_dev, KEY_FN, 1);
	else if (!keyboard_protocol->fn_pressed && applespi->last_fn_pressed)
		input_report_key(applespi->keyboard_input_dev, KEY_FN, 0);
	applespi->last_fn_pressed = keyboard_protocol->fn_pressed;

	/* done */
	input_sync(applespi->keyboard_input_dev);
	memcpy(&applespi->last_keys_pressed, keyboard_protocol->keys_pressed,
	       sizeof(applespi->last_keys_pressed));
}

static const struct applespi_tp_info *applespi_find_touchpad_info(u8 model)
{
	const struct applespi_tp_model_info *info;

	for (info = applespi_tp_models; info->model; info++) {
		if (info->model == model)
			return &info->tp_info;
	}

	return NULL;
}

static int
applespi_register_touchpad_device(struct applespi_data *applespi,
				  struct touchpad_info_protocol *rcvd_tp_info)
{
	const struct applespi_tp_info *tp_info;
	struct input_dev *touchpad_input_dev;
	int sts;

	/* set up touchpad dimensions */
	tp_info = applespi_find_touchpad_info(rcvd_tp_info->model_no);
	if (!tp_info) {
		dev_warn(&applespi->spi->dev,
			 "Unknown touchpad model %x - falling back to MB8 touchpad\n",
			 rcvd_tp_info->model_no);
		tp_info = &applespi_tp_models[0].tp_info;
	}

	applespi->tp_info = *tp_info;

	if (touchpad_dimensions[0]) {
		int x, y, w, h;

		sts = sscanf(touchpad_dimensions, "%dx%d+%u+%u", &x, &y, &w, &h);
		if (sts == 4) {
			dev_info(&applespi->spi->dev,
				 "Overriding touchpad dimensions from module param\n");
			applespi->tp_info.x_min = x;
			applespi->tp_info.y_min = y;
			applespi->tp_info.x_max = x + w;
			applespi->tp_info.y_max = y + h;
		} else {
			dev_warn(&applespi->spi->dev,
				 "Invalid touchpad dimensions '%s': must be in the form XxY+W+H\n",
				 touchpad_dimensions);
			touchpad_dimensions[0] = '\0';
		}
	}
	if (!touchpad_dimensions[0]) {
		snprintf(touchpad_dimensions, sizeof(touchpad_dimensions),
			 "%dx%d+%u+%u",
			 applespi->tp_info.x_min,
			 applespi->tp_info.y_min,
			 applespi->tp_info.x_max - applespi->tp_info.x_min,
			 applespi->tp_info.y_max - applespi->tp_info.y_min);
	}

	/* create touchpad input device */
	touchpad_input_dev = devm_input_allocate_device(&applespi->spi->dev);
	if (!touchpad_input_dev) {
		dev_err(&applespi->spi->dev,
			"Failed to allocate touchpad input device\n");
		return -ENOMEM;
	}

	touchpad_input_dev->name = "Apple SPI Touchpad";
	touchpad_input_dev->phys = "applespi/input1";
	touchpad_input_dev->dev.parent = &applespi->spi->dev;
	touchpad_input_dev->id.bustype = BUS_SPI;
	touchpad_input_dev->id.vendor = SYNAPTICS_VENDOR_ID;
	touchpad_input_dev->id.product =
			rcvd_tp_info->model_no << 8 | rcvd_tp_info->model_flags;

	/* basic properties */
	input_set_capability(touchpad_input_dev, EV_REL, REL_X);
	input_set_capability(touchpad_input_dev, EV_REL, REL_Y);

	__set_bit(INPUT_PROP_POINTER, touchpad_input_dev->propbit);
	__set_bit(INPUT_PROP_BUTTONPAD, touchpad_input_dev->propbit);

	/* finger touch area */
	input_set_abs_params(touchpad_input_dev, ABS_MT_TOUCH_MAJOR,
			     0, 5000, 0, 0);
	input_set_abs_params(touchpad_input_dev, ABS_MT_TOUCH_MINOR,
			     0, 5000, 0, 0);

	/* finger approach area */
	input_set_abs_params(touchpad_input_dev, ABS_MT_WIDTH_MAJOR,
			     0, 5000, 0, 0);
	input_set_abs_params(touchpad_input_dev, ABS_MT_WIDTH_MINOR,
			     0, 5000, 0, 0);

	/* finger orientation */
	input_set_abs_params(touchpad_input_dev, ABS_MT_ORIENTATION,
			     -MAX_FINGER_ORIENTATION, MAX_FINGER_ORIENTATION,
			     0, 0);

	/* finger position */
	input_set_abs_params(touchpad_input_dev, ABS_MT_POSITION_X,
			     applespi->tp_info.x_min, applespi->tp_info.x_max,
			     0, 0);
	input_set_abs_params(touchpad_input_dev, ABS_MT_POSITION_Y,
			     applespi->tp_info.y_min, applespi->tp_info.y_max,
			     0, 0);

	/* touchpad button */
	input_set_capability(touchpad_input_dev, EV_KEY, BTN_LEFT);

	/* multitouch */
	sts = input_mt_init_slots(touchpad_input_dev, MAX_FINGERS,
				  INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
					INPUT_MT_TRACK);
	if (sts) {
		dev_err(&applespi->spi->dev,
			"failed to initialize slots: %d", sts);
		return sts;
	}

	/* register input device */
	sts = input_register_device(touchpad_input_dev);
	if (sts) {
		dev_err(&applespi->spi->dev,
			"Unable to register touchpad input device (%d)\n", sts);
		return sts;
	}

	/* touchpad_input_dev is read async in spi callback */
	smp_store_release(&applespi->touchpad_input_dev, touchpad_input_dev);

	return 0;
}

static void applespi_worker(struct work_struct *work)
{
	struct applespi_data *applespi =
		container_of(work, struct applespi_data, work);

	applespi_register_touchpad_device(applespi, &applespi->rcvd_tp_info);
}

static void applespi_handle_cmd_response(struct applespi_data *applespi,
					 struct spi_packet *packet,
					 struct message *message)
{
	if (packet->device == PACKET_DEV_INFO &&
	    le16_to_cpu(message->type) == 0x1020) {
		/*
		 * We're not allowed to sleep here, but registering an input
		 * device can sleep.
		 */
		applespi->rcvd_tp_info = message->tp_info;
		schedule_work(&applespi->work);
		return;
	}

	if (le16_to_cpu(message->length) != 0x0000) {
		dev_warn_ratelimited(&applespi->spi->dev,
				     "Received unexpected write response: length=%x\n",
				     le16_to_cpu(message->length));
		return;
	}

	if (packet->device == PACKET_DEV_TPAD &&
	    le16_to_cpu(message->type) == 0x0252 &&
	    le16_to_cpu(message->rsp_buf_len) == 0x0002)
		dev_info(&applespi->spi->dev, "modeswitch done.\n");
}

static bool applespi_verify_crc(struct applespi_data *applespi, u8 *buffer,
				size_t buflen)
{
	u16 crc;

	crc = crc16(0, buffer, buflen);
	if (crc) {
		dev_warn_ratelimited(&applespi->spi->dev,
				     "Received corrupted packet (crc mismatch)\n");
		trace_applespi_bad_crc(ET_RD_CRC, READ, buffer, buflen);

		return false;
	}

	return true;
}

static void applespi_debug_print_read_packet(struct applespi_data *applespi,
					     struct spi_packet *packet)
{
	unsigned int evt_type;

	if (packet->flags == PACKET_TYPE_READ &&
	    packet->device == PACKET_DEV_KEYB)
		evt_type = ET_RD_KEYB;
	else if (packet->flags == PACKET_TYPE_READ &&
		 packet->device == PACKET_DEV_TPAD)
		evt_type = ET_RD_TPAD;
	else if (packet->flags == PACKET_TYPE_WRITE)
		evt_type = applespi->cmd_evt_type;
	else
		evt_type = ET_RD_UNKN;

	applespi_get_trace_fun(evt_type)(evt_type, PT_READ, applespi->rx_buffer,
					 APPLESPI_PACKET_SIZE);
}

static void applespi_got_data(struct applespi_data *applespi)
{
	struct spi_packet *packet;
	struct message *message;
	unsigned int msg_len;
	unsigned int off;
	unsigned int rem;
	unsigned int len;

	/* process packet header */
	if (!applespi_verify_crc(applespi, applespi->rx_buffer,
				 APPLESPI_PACKET_SIZE)) {
		unsigned long flags;

		spin_lock_irqsave(&applespi->cmd_msg_lock, flags);

		if (applespi->drain) {
			applespi->read_active = false;
			applespi->write_active = false;

			wake_up_all(&applespi->drain_complete);
		}

		spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);

		return;
	}

	packet = (struct spi_packet *)applespi->rx_buffer;

	applespi_debug_print_read_packet(applespi, packet);

	off = le16_to_cpu(packet->offset);
	rem = le16_to_cpu(packet->remaining);
	len = le16_to_cpu(packet->length);

	if (len > sizeof(packet->data)) {
		dev_warn_ratelimited(&applespi->spi->dev,
				     "Received corrupted packet (invalid packet length %u)\n",
				     len);
		goto msg_complete;
	}

	/* handle multi-packet messages */
	if (rem > 0 || off > 0) {
		if (off != applespi->saved_msg_len) {
			dev_warn_ratelimited(&applespi->spi->dev,
					     "Received unexpected offset (got %u, expected %u)\n",
					     off, applespi->saved_msg_len);
			goto msg_complete;
		}

		if (off + rem > MAX_PKTS_PER_MSG * APPLESPI_PACKET_SIZE) {
			dev_warn_ratelimited(&applespi->spi->dev,
					     "Received message too large (size %u)\n",
					     off + rem);
			goto msg_complete;
		}

		if (off + len > MAX_PKTS_PER_MSG * APPLESPI_PACKET_SIZE) {
			dev_warn_ratelimited(&applespi->spi->dev,
					     "Received message too large (size %u)\n",
					     off + len);
			goto msg_complete;
		}

		memcpy(applespi->msg_buf + off, &packet->data, len);
		applespi->saved_msg_len += len;

		if (rem > 0)
			return;

		message = (struct message *)applespi->msg_buf;
		msg_len = applespi->saved_msg_len;
	} else {
		message = (struct message *)&packet->data;
		msg_len = len;
	}

	/* got complete message - verify */
	if (!applespi_verify_crc(applespi, (u8 *)message, msg_len))
		goto msg_complete;

	if (le16_to_cpu(message->length) != msg_len - MSG_HEADER_SIZE - 2) {
		dev_warn_ratelimited(&applespi->spi->dev,
				     "Received corrupted packet (invalid message length %u - expected %u)\n",
				     le16_to_cpu(message->length),
				     msg_len - MSG_HEADER_SIZE - 2);
		goto msg_complete;
	}

	/* handle message */
	if (packet->flags == PACKET_TYPE_READ &&
	    packet->device == PACKET_DEV_KEYB) {
		applespi_handle_keyboard_event(applespi, &message->keyboard);

	} else if (packet->flags == PACKET_TYPE_READ &&
		   packet->device == PACKET_DEV_TPAD) {
		struct touchpad_protocol *tp;
		size_t tp_len;

		tp = &message->touchpad;
		tp_len = struct_size(tp, fingers, tp->number_of_fingers);

		if (le16_to_cpu(message->length) + 2 != tp_len) {
			dev_warn_ratelimited(&applespi->spi->dev,
					     "Received corrupted packet (invalid message length %u - num-fingers %u, tp-len %zu)\n",
					     le16_to_cpu(message->length),
					     tp->number_of_fingers, tp_len);
			goto msg_complete;
		}

		if (tp->number_of_fingers > MAX_FINGERS) {
			dev_warn_ratelimited(&applespi->spi->dev,
					     "Number of reported fingers (%u) exceeds max (%u))\n",
					     tp->number_of_fingers,
					     MAX_FINGERS);
			tp->number_of_fingers = MAX_FINGERS;
		}

		report_tp_state(applespi, tp);

	} else if (packet->flags == PACKET_TYPE_WRITE) {
		applespi_handle_cmd_response(applespi, packet, message);
	}

msg_complete:
	applespi->saved_msg_len = 0;

	applespi_msg_complete(applespi, packet->flags == PACKET_TYPE_WRITE,
			      true);
}

static void applespi_async_read_complete(void *context)
{
	struct applespi_data *applespi = context;

	if (applespi->rd_m.status < 0) {
		dev_warn(&applespi->spi->dev, "Error reading from device: %d\n",
			 applespi->rd_m.status);
		/*
		 * We don't actually know if this was a pure read, or a response
		 * to a write. But this is a rare error condition that should
		 * never occur, so clearing both flags to avoid deadlock.
		 */
		applespi_msg_complete(applespi, true, true);
	} else {
		applespi_got_data(applespi);
	}

	acpi_finish_gpe(NULL, applespi->gpe);
}

static u32 applespi_notify(acpi_handle gpe_device, u32 gpe, void *context)
{
	struct applespi_data *applespi = context;
	int sts;
	unsigned long flags;

	trace_applespi_irq_received(ET_RD_IRQ, PT_READ);

	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);

	if (!applespi->suspended) {
		sts = applespi_async(applespi, &applespi->rd_m,
				     applespi_async_read_complete);
		if (sts)
			dev_warn(&applespi->spi->dev,
				 "Error queueing async read to device: %d\n",
				 sts);
		else
			applespi->read_active = true;
	}

	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);

	return ACPI_INTERRUPT_HANDLED;
}

static int applespi_get_saved_bl_level(struct applespi_data *applespi)
{
	efi_status_t sts = EFI_NOT_FOUND;
	u16 efi_data = 0;
	unsigned long efi_data_len = sizeof(efi_data);

	if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
		sts = efi.get_variable(EFI_BL_LEVEL_NAME, &EFI_BL_LEVEL_GUID,
				       NULL, &efi_data_len, &efi_data);
	if (sts != EFI_SUCCESS && sts != EFI_NOT_FOUND)
		dev_warn(&applespi->spi->dev,
			 "Error getting backlight level from EFI vars: 0x%lx\n",
			 sts);

	return sts != EFI_SUCCESS ? -ENODEV : efi_data;
}

static void applespi_save_bl_level(struct applespi_data *applespi,
				   unsigned int level)
{
	efi_status_t sts = EFI_UNSUPPORTED;
	u32 efi_attr;
	u16 efi_data;

	efi_data = (u16)level;
	efi_attr = EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS |
		   EFI_VARIABLE_RUNTIME_ACCESS;

	if (efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE))
		sts = efi.set_variable(EFI_BL_LEVEL_NAME, &EFI_BL_LEVEL_GUID,
				       efi_attr, sizeof(efi_data), &efi_data);
	if (sts != EFI_SUCCESS)
		dev_warn(&applespi->spi->dev,
			 "Error saving backlight level to EFI vars: 0x%lx\n", sts);
}

static int applespi_probe(struct spi_device *spi)
{
	struct applespi_data *applespi;
	acpi_handle spi_handle = ACPI_HANDLE(&spi->dev);
	acpi_status acpi_sts;
	int sts, i;
	unsigned long long gpe, usb_status;

	/* check if the USB interface is present and enabled already */
	acpi_sts = acpi_evaluate_integer(spi_handle, "UIST", NULL, &usb_status);
	if (ACPI_SUCCESS(acpi_sts) && usb_status) {
		/* let the USB driver take over instead */
		dev_info(&spi->dev, "USB interface already enabled\n");
		return -ENODEV;
	}

	/* allocate driver data */
	applespi = devm_kzalloc(&spi->dev, sizeof(*applespi), GFP_KERNEL);
	if (!applespi)
		return -ENOMEM;

	applespi->spi = spi;

	INIT_WORK(&applespi->work, applespi_worker);

	/* store the driver data */
	spi_set_drvdata(spi, applespi);

	/* create our buffers */
	applespi->tx_buffer = devm_kmalloc(&spi->dev, APPLESPI_PACKET_SIZE,
					   GFP_KERNEL);
	applespi->tx_status = devm_kmalloc(&spi->dev, APPLESPI_STATUS_SIZE,
					   GFP_KERNEL);
	applespi->rx_buffer = devm_kmalloc(&spi->dev, APPLESPI_PACKET_SIZE,
					   GFP_KERNEL);
	applespi->msg_buf = devm_kmalloc_array(&spi->dev, MAX_PKTS_PER_MSG,
					       APPLESPI_PACKET_SIZE,
					       GFP_KERNEL);

	if (!applespi->tx_buffer || !applespi->tx_status ||
	    !applespi->rx_buffer || !applespi->msg_buf)
		return -ENOMEM;

	/* set up our spi messages */
	applespi_setup_read_txfrs(applespi);
	applespi_setup_write_txfrs(applespi);

	/* cache ACPI method handles */
	acpi_sts = acpi_get_handle(spi_handle, "SIEN", &applespi->sien);
	if (ACPI_FAILURE(acpi_sts)) {
		dev_err(&applespi->spi->dev,
			"Failed to get SIEN ACPI method handle: %s\n",
			acpi_format_exception(acpi_sts));
		return -ENODEV;
	}

	acpi_sts = acpi_get_handle(spi_handle, "SIST", &applespi->sist);
	if (ACPI_FAILURE(acpi_sts)) {
		dev_err(&applespi->spi->dev,
			"Failed to get SIST ACPI method handle: %s\n",
			acpi_format_exception(acpi_sts));
		return -ENODEV;
	}

	/* switch on the SPI interface */
	sts = applespi_setup_spi(applespi);
	if (sts)
		return sts;

	sts = applespi_enable_spi(applespi);
	if (sts)
		return sts;

	/* setup the keyboard input dev */
	applespi->keyboard_input_dev = devm_input_allocate_device(&spi->dev);

	if (!applespi->keyboard_input_dev)
		return -ENOMEM;

	applespi->keyboard_input_dev->name = "Apple SPI Keyboard";
	applespi->keyboard_input_dev->phys = "applespi/input0";
	applespi->keyboard_input_dev->dev.parent = &spi->dev;
	applespi->keyboard_input_dev->id.bustype = BUS_SPI;

	applespi->keyboard_input_dev->evbit[0] =
			BIT_MASK(EV_KEY) | BIT_MASK(EV_LED) | BIT_MASK(EV_REP);
	applespi->keyboard_input_dev->ledbit[0] = BIT_MASK(LED_CAPSL);

	input_set_drvdata(applespi->keyboard_input_dev, applespi);
	applespi->keyboard_input_dev->event = applespi_event;

	for (i = 0; i < ARRAY_SIZE(applespi_scancodes); i++)
		if (applespi_scancodes[i])
			input_set_capability(applespi->keyboard_input_dev,
					     EV_KEY, applespi_scancodes[i]);

	for (i = 0; i < ARRAY_SIZE(applespi_controlcodes); i++)
		if (applespi_controlcodes[i])
			input_set_capability(applespi->keyboard_input_dev,
					     EV_KEY, applespi_controlcodes[i]);

	for (i = 0; i < ARRAY_SIZE(applespi_fn_codes); i++)
		if (applespi_fn_codes[i].to)
			input_set_capability(applespi->keyboard_input_dev,
					     EV_KEY, applespi_fn_codes[i].to);

	input_set_capability(applespi->keyboard_input_dev, EV_KEY, KEY_FN);

	sts = input_register_device(applespi->keyboard_input_dev);
	if (sts) {
		dev_err(&applespi->spi->dev,
			"Unable to register keyboard input device (%d)\n", sts);
		return -ENODEV;
	}

	/*
	 * The applespi device doesn't send interrupts normally (as is described
	 * in its DSDT), but rather seems to use ACPI GPEs.
	 */
	acpi_sts = acpi_evaluate_integer(spi_handle, "_GPE", NULL, &gpe);
	if (ACPI_FAILURE(acpi_sts)) {
		dev_err(&applespi->spi->dev,
			"Failed to obtain GPE for SPI slave device: %s\n",
			acpi_format_exception(acpi_sts));
		return -ENODEV;
	}
	applespi->gpe = (int)gpe;

	acpi_sts = acpi_install_gpe_handler(NULL, applespi->gpe,
					    ACPI_GPE_LEVEL_TRIGGERED,
					    applespi_notify, applespi);
	if (ACPI_FAILURE(acpi_sts)) {
		dev_err(&applespi->spi->dev,
			"Failed to install GPE handler for GPE %d: %s\n",
			applespi->gpe, acpi_format_exception(acpi_sts));
		return -ENODEV;
	}

	applespi->suspended = false;

	acpi_sts = acpi_enable_gpe(NULL, applespi->gpe);
	if (ACPI_FAILURE(acpi_sts)) {
		dev_err(&applespi->spi->dev,
			"Failed to enable GPE handler for GPE %d: %s\n",
			applespi->gpe, acpi_format_exception(acpi_sts));
		acpi_remove_gpe_handler(NULL, applespi->gpe, applespi_notify);
		return -ENODEV;
	}

	/* trigger touchpad setup */
	applespi_init(applespi, false);

	/*
	 * By default this device is not enabled for wakeup; but USB keyboards
	 * generally are, so the expectation is that by default the keyboard
	 * will wake the system.
	 */
	device_wakeup_enable(&spi->dev);

	/* set up keyboard-backlight */
	sts = applespi_get_saved_bl_level(applespi);
	if (sts >= 0)
		applespi_set_bl_level(&applespi->backlight_info, sts);

	applespi->backlight_info.name            = "spi::kbd_backlight";
	applespi->backlight_info.default_trigger = "kbd-backlight";
	applespi->backlight_info.brightness_set  = applespi_set_bl_level;

	sts = devm_led_classdev_register(&spi->dev, &applespi->backlight_info);
	if (sts)
		dev_warn(&applespi->spi->dev,
			 "Unable to register keyboard backlight class dev (%d)\n",
			 sts);

	/* set up debugfs entries for touchpad dimensions logging */
	applespi->debugfs_root = debugfs_create_dir("applespi", NULL);

	debugfs_create_bool("enable_tp_dim", 0600, applespi->debugfs_root,
			    &applespi->debug_tp_dim);

	debugfs_create_file("tp_dim", 0400, applespi->debugfs_root, applespi,
			    &applespi_tp_dim_fops);

	return 0;
}

static void applespi_drain_writes(struct applespi_data *applespi)
{
	unsigned long flags;

	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);

	applespi->drain = true;
	wait_event_lock_irq(applespi->drain_complete, !applespi->write_active,
			    applespi->cmd_msg_lock);

	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);
}

static void applespi_drain_reads(struct applespi_data *applespi)
{
	unsigned long flags;

	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);

	wait_event_lock_irq(applespi->drain_complete, !applespi->read_active,
			    applespi->cmd_msg_lock);

	applespi->suspended = true;

	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);
}

static void applespi_remove(struct spi_device *spi)
{
	struct applespi_data *applespi = spi_get_drvdata(spi);

	applespi_drain_writes(applespi);

	acpi_disable_gpe(NULL, applespi->gpe);
	acpi_remove_gpe_handler(NULL, applespi->gpe, applespi_notify);
	device_wakeup_disable(&spi->dev);

	applespi_drain_reads(applespi);

	debugfs_remove_recursive(applespi->debugfs_root);
}

static void applespi_shutdown(struct spi_device *spi)
{
	struct applespi_data *applespi = spi_get_drvdata(spi);

	applespi_save_bl_level(applespi, applespi->have_bl_level);
}

static int applespi_poweroff_late(struct device *dev)
{
	struct spi_device *spi = to_spi_device(dev);
	struct applespi_data *applespi = spi_get_drvdata(spi);

	applespi_save_bl_level(applespi, applespi->have_bl_level);

	return 0;
}

static int applespi_suspend(struct device *dev)
{
	struct spi_device *spi = to_spi_device(dev);
	struct applespi_data *applespi = spi_get_drvdata(spi);
	acpi_status acpi_sts;
	int sts;

	/* turn off caps-lock - it'll stay on otherwise */
	sts = applespi_set_capsl_led(applespi, false);
	if (sts)
		dev_warn(&applespi->spi->dev,
			 "Failed to turn off caps-lock led (%d)\n", sts);

	applespi_drain_writes(applespi);

	/* disable the interrupt */
	acpi_sts = acpi_disable_gpe(NULL, applespi->gpe);
	if (ACPI_FAILURE(acpi_sts))
		dev_err(&applespi->spi->dev,
			"Failed to disable GPE handler for GPE %d: %s\n",
			applespi->gpe, acpi_format_exception(acpi_sts));

	applespi_drain_reads(applespi);

	return 0;
}

static int applespi_resume(struct device *dev)
{
	struct spi_device *spi = to_spi_device(dev);
	struct applespi_data *applespi = spi_get_drvdata(spi);
	acpi_status acpi_sts;
	unsigned long flags;

	/* ensure our flags and state reflect a newly resumed device */
	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);

	applespi->drain = false;
	applespi->have_cl_led_on = false;
	applespi->have_bl_level = 0;
	applespi->cmd_msg_queued = 0;
	applespi->read_active = false;
	applespi->write_active = false;

	applespi->suspended = false;

	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);

	/* switch on the SPI interface */
	applespi_enable_spi(applespi);

	/* re-enable the interrupt */
	acpi_sts = acpi_enable_gpe(NULL, applespi->gpe);
	if (ACPI_FAILURE(acpi_sts))
		dev_err(&applespi->spi->dev,
			"Failed to re-enable GPE handler for GPE %d: %s\n",
			applespi->gpe, acpi_format_exception(acpi_sts));

	/* switch the touchpad into multitouch mode */
	applespi_init(applespi, true);

	return 0;
}

static const struct acpi_device_id applespi_acpi_match[] = {
	{ "APP000D", 0 },
	{ }
};
MODULE_DEVICE_TABLE(acpi, applespi_acpi_match);

static const struct dev_pm_ops applespi_pm_ops = {
	SYSTEM_SLEEP_PM_OPS(applespi_suspend, applespi_resume)
	.poweroff_late	= pm_sleep_ptr(applespi_poweroff_late),
};

static struct spi_driver applespi_driver = {
	.driver		= {
		.name			= "applespi",
		.acpi_match_table	= applespi_acpi_match,
		.pm			= pm_sleep_ptr(&applespi_pm_ops),
	},
	.probe		= applespi_probe,
	.remove		= applespi_remove,
	.shutdown	= applespi_shutdown,
};

module_spi_driver(applespi_driver)

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MacBook(Pro) SPI Keyboard/Touchpad driver");
MODULE_AUTHOR("Federico Lorenzi");
MODULE_AUTHOR("Ronald Tschalär");