summaryrefslogtreecommitdiff
path: root/drivers/input/mouse/alps.c
blob: 7b99fc7c9438dbcbcc115248403e4b9704611f29 (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
/*
 * ALPS touchpad PS/2 mouse driver
 *
 * Copyright (c) 2003 Neil Brown <neilb@cse.unsw.edu.au>
 * Copyright (c) 2003-2005 Peter Osterlund <petero2@telia.com>
 * Copyright (c) 2004 Dmitry Torokhov <dtor@mail.ru>
 * Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>
 * Copyright (c) 2009 Sebastian Kapfer <sebastian_kapfer@gmx.net>
 *
 * ALPS detection, tap switching and status querying info is taken from
 * tpconfig utility (by C. Scott Ananian and Bruce Kall).
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/slab.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/serio.h>
#include <linux/libps2.h>

#include "psmouse.h"
#include "alps.h"

/*
 * Definitions for ALPS version 3 and 4 command mode protocol
 */
#define ALPS_CMD_NIBBLE_10	0x01f2

#define ALPS_REG_BASE_RUSHMORE	0xc2c0
#define ALPS_REG_BASE_PINNACLE	0x0000

static const struct alps_nibble_commands alps_v3_nibble_commands[] = {
	{ PSMOUSE_CMD_SETPOLL,		0x00 }, /* 0 */
	{ PSMOUSE_CMD_RESET_DIS,	0x00 }, /* 1 */
	{ PSMOUSE_CMD_SETSCALE21,	0x00 }, /* 2 */
	{ PSMOUSE_CMD_SETRATE,		0x0a }, /* 3 */
	{ PSMOUSE_CMD_SETRATE,		0x14 }, /* 4 */
	{ PSMOUSE_CMD_SETRATE,		0x28 }, /* 5 */
	{ PSMOUSE_CMD_SETRATE,		0x3c }, /* 6 */
	{ PSMOUSE_CMD_SETRATE,		0x50 }, /* 7 */
	{ PSMOUSE_CMD_SETRATE,		0x64 }, /* 8 */
	{ PSMOUSE_CMD_SETRATE,		0xc8 }, /* 9 */
	{ ALPS_CMD_NIBBLE_10,		0x00 }, /* a */
	{ PSMOUSE_CMD_SETRES,		0x00 }, /* b */
	{ PSMOUSE_CMD_SETRES,		0x01 }, /* c */
	{ PSMOUSE_CMD_SETRES,		0x02 }, /* d */
	{ PSMOUSE_CMD_SETRES,		0x03 }, /* e */
	{ PSMOUSE_CMD_SETSCALE11,	0x00 }, /* f */
};

static const struct alps_nibble_commands alps_v4_nibble_commands[] = {
	{ PSMOUSE_CMD_ENABLE,		0x00 }, /* 0 */
	{ PSMOUSE_CMD_RESET_DIS,	0x00 }, /* 1 */
	{ PSMOUSE_CMD_SETSCALE21,	0x00 }, /* 2 */
	{ PSMOUSE_CMD_SETRATE,		0x0a }, /* 3 */
	{ PSMOUSE_CMD_SETRATE,		0x14 }, /* 4 */
	{ PSMOUSE_CMD_SETRATE,		0x28 }, /* 5 */
	{ PSMOUSE_CMD_SETRATE,		0x3c }, /* 6 */
	{ PSMOUSE_CMD_SETRATE,		0x50 }, /* 7 */
	{ PSMOUSE_CMD_SETRATE,		0x64 }, /* 8 */
	{ PSMOUSE_CMD_SETRATE,		0xc8 }, /* 9 */
	{ ALPS_CMD_NIBBLE_10,		0x00 }, /* a */
	{ PSMOUSE_CMD_SETRES,		0x00 }, /* b */
	{ PSMOUSE_CMD_SETRES,		0x01 }, /* c */
	{ PSMOUSE_CMD_SETRES,		0x02 }, /* d */
	{ PSMOUSE_CMD_SETRES,		0x03 }, /* e */
	{ PSMOUSE_CMD_SETSCALE11,	0x00 }, /* f */
};


#define ALPS_DUALPOINT		0x02	/* touchpad has trackstick */
#define ALPS_PASS		0x04	/* device has a pass-through port */

#define ALPS_WHEEL		0x08	/* hardware wheel present */
#define ALPS_FW_BK_1		0x10	/* front & back buttons present */
#define ALPS_FW_BK_2		0x20	/* front & back buttons present */
#define ALPS_FOUR_BUTTONS	0x40	/* 4 direction button present */
#define ALPS_PS2_INTERLEAVED	0x80	/* 3-byte PS/2 packet interleaved with
					   6-byte ALPS packet */

static const struct alps_model_info alps_model_data[] = {
	{ { 0x32, 0x02, 0x14 },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT },	/* Toshiba Salellite Pro M10 */
	{ { 0x33, 0x02, 0x0a },	0x00, ALPS_PROTO_V1, 0x88, 0xf8, 0 },				/* UMAX-530T */
	{ { 0x53, 0x02, 0x0a },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, 0 },
	{ { 0x53, 0x02, 0x14 },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, 0 },
	{ { 0x60, 0x03, 0xc8 }, 0x00, ALPS_PROTO_V2, 0xf8, 0xf8, 0 },				/* HP ze1115 */
	{ { 0x63, 0x02, 0x0a },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, 0 },
	{ { 0x63, 0x02, 0x14 },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, 0 },
	{ { 0x63, 0x02, 0x28 },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 },		/* Fujitsu Siemens S6010 */
	{ { 0x63, 0x02, 0x3c },	0x00, ALPS_PROTO_V2, 0x8f, 0x8f, ALPS_WHEEL },			/* Toshiba Satellite S2400-103 */
	{ { 0x63, 0x02, 0x50 },	0x00, ALPS_PROTO_V2, 0xef, 0xef, ALPS_FW_BK_1 },		/* NEC Versa L320 */
	{ { 0x63, 0x02, 0x64 },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, 0 },
	{ { 0x63, 0x03, 0xc8 }, 0x00, ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT },	/* Dell Latitude D800 */
	{ { 0x73, 0x00, 0x0a },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_DUALPOINT },		/* ThinkPad R61 8918-5QG */
	{ { 0x73, 0x02, 0x0a },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, 0 },
	{ { 0x73, 0x02, 0x14 },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 },		/* Ahtec Laptop */
	{ { 0x20, 0x02, 0x0e },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT },	/* XXX */
	{ { 0x22, 0x02, 0x0a },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT },
	{ { 0x22, 0x02, 0x14 }, 0x00, ALPS_PROTO_V2, 0xff, 0xff, ALPS_PASS | ALPS_DUALPOINT },	/* Dell Latitude D600 */
	/* Dell Latitude E5500, E6400, E6500, Precision M4400 */
	{ { 0x62, 0x02, 0x14 }, 0x00, ALPS_PROTO_V2, 0xcf, 0xcf,
		ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED },
	{ { 0x73, 0x02, 0x50 }, 0x00, ALPS_PROTO_V2, 0xcf, 0xcf, ALPS_FOUR_BUTTONS },		/* Dell Vostro 1400 */
	{ { 0x52, 0x01, 0x14 }, 0x00, ALPS_PROTO_V2, 0xff, 0xff,
		ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED },				/* Toshiba Tecra A11-11L */
	{ { 0x73, 0x02, 0x64 },	0x8a, ALPS_PROTO_V4, 0x8f, 0x8f, 0 },
};

static void alps_set_abs_params_st(struct alps_data *priv,
				   struct input_dev *dev1);
static void alps_set_abs_params_mt(struct alps_data *priv,
				   struct input_dev *dev1);

/*
 * XXX - this entry is suspicious. First byte has zero lower nibble,
 * which is what a normal mouse would report. Also, the value 0x0e
 * isn't valid per PS/2 spec.
 */

/* Packet formats are described in Documentation/input/alps.txt */

static bool alps_is_valid_first_byte(struct alps_data *priv,
				     unsigned char data)
{
	return (data & priv->mask0) == priv->byte0;
}

static void alps_report_buttons(struct psmouse *psmouse,
				struct input_dev *dev1, struct input_dev *dev2,
				int left, int right, int middle)
{
	struct input_dev *dev;

	/*
	 * If shared button has already been reported on the
	 * other device (dev2) then this event should be also
	 * sent through that device.
	 */
	dev = test_bit(BTN_LEFT, dev2->key) ? dev2 : dev1;
	input_report_key(dev, BTN_LEFT, left);

	dev = test_bit(BTN_RIGHT, dev2->key) ? dev2 : dev1;
	input_report_key(dev, BTN_RIGHT, right);

	dev = test_bit(BTN_MIDDLE, dev2->key) ? dev2 : dev1;
	input_report_key(dev, BTN_MIDDLE, middle);

	/*
	 * Sync the _other_ device now, we'll do the first
	 * device later once we report the rest of the events.
	 */
	input_sync(dev2);
}

static void alps_process_packet_v1_v2(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;
	unsigned char *packet = psmouse->packet;
	struct input_dev *dev = psmouse->dev;
	struct input_dev *dev2 = priv->dev2;
	int x, y, z, ges, fin, left, right, middle;
	int back = 0, forward = 0;

	if (priv->proto_version == ALPS_PROTO_V1) {
		left = packet[2] & 0x10;
		right = packet[2] & 0x08;
		middle = 0;
		x = packet[1] | ((packet[0] & 0x07) << 7);
		y = packet[4] | ((packet[3] & 0x07) << 7);
		z = packet[5];
	} else {
		left = packet[3] & 1;
		right = packet[3] & 2;
		middle = packet[3] & 4;
		x = packet[1] | ((packet[2] & 0x78) << (7 - 3));
		y = packet[4] | ((packet[3] & 0x70) << (7 - 4));
		z = packet[5];
	}

	if (priv->flags & ALPS_FW_BK_1) {
		back = packet[0] & 0x10;
		forward = packet[2] & 4;
	}

	if (priv->flags & ALPS_FW_BK_2) {
		back = packet[3] & 4;
		forward = packet[2] & 4;
		if ((middle = forward && back))
			forward = back = 0;
	}

	ges = packet[2] & 1;
	fin = packet[2] & 2;

	if ((priv->flags & ALPS_DUALPOINT) && z == 127) {
		input_report_rel(dev2, REL_X,  (x > 383 ? (x - 768) : x));
		input_report_rel(dev2, REL_Y, -(y > 255 ? (y - 512) : y));

		alps_report_buttons(psmouse, dev2, dev, left, right, middle);

		input_sync(dev2);
		return;
	}

	alps_report_buttons(psmouse, dev, dev2, left, right, middle);

	/* Convert hardware tap to a reasonable Z value */
	if (ges && !fin)
		z = 40;

	/*
	 * A "tap and drag" operation is reported by the hardware as a transition
	 * from (!fin && ges) to (fin && ges). This should be translated to the
	 * sequence Z>0, Z==0, Z>0, so the Z==0 event has to be generated manually.
	 */
	if (ges && fin && !priv->prev_fin) {
		input_report_abs(dev, ABS_X, x);
		input_report_abs(dev, ABS_Y, y);
		input_report_abs(dev, ABS_PRESSURE, 0);
		input_report_key(dev, BTN_TOOL_FINGER, 0);
		input_sync(dev);
	}
	priv->prev_fin = fin;

	if (z > 30)
		input_report_key(dev, BTN_TOUCH, 1);
	if (z < 25)
		input_report_key(dev, BTN_TOUCH, 0);

	if (z > 0) {
		input_report_abs(dev, ABS_X, x);
		input_report_abs(dev, ABS_Y, y);
	}

	input_report_abs(dev, ABS_PRESSURE, z);
	input_report_key(dev, BTN_TOOL_FINGER, z > 0);

	if (priv->flags & ALPS_WHEEL)
		input_report_rel(dev, REL_WHEEL, ((packet[2] << 1) & 0x08) - ((packet[0] >> 4) & 0x07));

	if (priv->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
		input_report_key(dev, BTN_FORWARD, forward);
		input_report_key(dev, BTN_BACK, back);
	}

	if (priv->flags & ALPS_FOUR_BUTTONS) {
		input_report_key(dev, BTN_0, packet[2] & 4);
		input_report_key(dev, BTN_1, packet[0] & 0x10);
		input_report_key(dev, BTN_2, packet[3] & 4);
		input_report_key(dev, BTN_3, packet[0] & 0x20);
	}

	input_sync(dev);
}

/*
 * Process bitmap data from v3 and v4 protocols. Returns the number of
 * fingers detected. A return value of 0 means at least one of the
 * bitmaps was empty.
 *
 * The bitmaps don't have enough data to track fingers, so this function
 * only generates points representing a bounding box of all contacts.
 * These points are returned in x1, y1, x2, and y2 when the return value
 * is greater than 0.
 */
static int alps_process_bitmap(struct alps_data *priv,
			       unsigned int x_map, unsigned int y_map,
			       int *x1, int *y1, int *x2, int *y2)
{
	struct alps_bitmap_point {
		int start_bit;
		int num_bits;
	};

	int fingers_x = 0, fingers_y = 0, fingers;
	int i, bit, prev_bit;
	struct alps_bitmap_point x_low = {0,}, x_high = {0,};
	struct alps_bitmap_point y_low = {0,}, y_high = {0,};
	struct alps_bitmap_point *point;

	if (!x_map || !y_map)
		return 0;

	*x1 = *y1 = *x2 = *y2 = 0;

	prev_bit = 0;
	point = &x_low;
	for (i = 0; x_map != 0; i++, x_map >>= 1) {
		bit = x_map & 1;
		if (bit) {
			if (!prev_bit) {
				point->start_bit = i;
				fingers_x++;
			}
			point->num_bits++;
		} else {
			if (prev_bit)
				point = &x_high;
			else
				point->num_bits = 0;
		}
		prev_bit = bit;
	}

	/*
	 * y bitmap is reversed for what we need (lower positions are in
	 * higher bits), so we process from the top end.
	 */
	y_map = y_map << (sizeof(y_map) * BITS_PER_BYTE - priv->y_bits);
	prev_bit = 0;
	point = &y_low;
	for (i = 0; y_map != 0; i++, y_map <<= 1) {
		bit = y_map & (1 << (sizeof(y_map) * BITS_PER_BYTE - 1));
		if (bit) {
			if (!prev_bit) {
				point->start_bit = i;
				fingers_y++;
			}
			point->num_bits++;
		} else {
			if (prev_bit)
				point = &y_high;
			else
				point->num_bits = 0;
		}
		prev_bit = bit;
	}

	/*
	 * Fingers can overlap, so we use the maximum count of fingers
	 * on either axis as the finger count.
	 */
	fingers = max(fingers_x, fingers_y);

	/*
	 * If total fingers is > 1 but either axis reports only a single
	 * contact, we have overlapping or adjacent fingers. For the
	 * purposes of creating a bounding box, divide the single contact
	 * (roughly) equally between the two points.
	 */
	if (fingers > 1) {
		if (fingers_x == 1) {
			i = x_low.num_bits / 2;
			x_low.num_bits = x_low.num_bits - i;
			x_high.start_bit = x_low.start_bit + i;
			x_high.num_bits = max(i, 1);
		} else if (fingers_y == 1) {
			i = y_low.num_bits / 2;
			y_low.num_bits = y_low.num_bits - i;
			y_high.start_bit = y_low.start_bit + i;
			y_high.num_bits = max(i, 1);
		}
	}

	*x1 = (priv->x_max * (2 * x_low.start_bit + x_low.num_bits - 1)) /
	      (2 * (priv->x_bits - 1));
	*y1 = (priv->y_max * (2 * y_low.start_bit + y_low.num_bits - 1)) /
	      (2 * (priv->y_bits - 1));

	if (fingers > 1) {
		*x2 = (priv->x_max *
		       (2 * x_high.start_bit + x_high.num_bits - 1)) /
		      (2 * (priv->x_bits - 1));
		*y2 = (priv->y_max *
		       (2 * y_high.start_bit + y_high.num_bits - 1)) /
		      (2 * (priv->y_bits - 1));
	}

	return fingers;
}

static void alps_set_slot(struct input_dev *dev, int slot, bool active,
			  int x, int y)
{
	input_mt_slot(dev, slot);
	input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
	if (active) {
		input_report_abs(dev, ABS_MT_POSITION_X, x);
		input_report_abs(dev, ABS_MT_POSITION_Y, y);
	}
}

static void alps_report_semi_mt_data(struct input_dev *dev, int num_fingers,
				     int x1, int y1, int x2, int y2)
{
	alps_set_slot(dev, 0, num_fingers != 0, x1, y1);
	alps_set_slot(dev, 1, num_fingers == 2, x2, y2);
}

static void alps_process_trackstick_packet_v3(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;
	unsigned char *packet = psmouse->packet;
	struct input_dev *dev = priv->dev2;
	int x, y, z, left, right, middle;

	/* Sanity check packet */
	if (!(packet[0] & 0x40)) {
		psmouse_dbg(psmouse, "Bad trackstick packet, discarding\n");
		return;
	}

	/*
	 * There's a special packet that seems to indicate the end
	 * of a stream of trackstick data. Filter these out.
	 */
	if (packet[1] == 0x7f && packet[2] == 0x7f && packet[4] == 0x7f)
		return;

	x = (s8)(((packet[0] & 0x20) << 2) | (packet[1] & 0x7f));
	y = (s8)(((packet[0] & 0x10) << 3) | (packet[2] & 0x7f));
	z = (packet[4] & 0x7c) >> 2;

	/*
	 * The x and y values tend to be quite large, and when used
	 * alone the trackstick is difficult to use. Scale them down
	 * to compensate.
	 */
	x /= 8;
	y /= 8;

	input_report_rel(dev, REL_X, x);
	input_report_rel(dev, REL_Y, -y);

	/*
	 * Most ALPS models report the trackstick buttons in the touchpad
	 * packets, but a few report them here. No reliable way has been
	 * found to differentiate between the models upfront, so we enable
	 * the quirk in response to seeing a button press in the trackstick
	 * packet.
	 */
	left = packet[3] & 0x01;
	right = packet[3] & 0x02;
	middle = packet[3] & 0x04;

	if (!(priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS) &&
	    (left || right || middle))
		priv->quirks |= ALPS_QUIRK_TRACKSTICK_BUTTONS;

	if (priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS) {
		input_report_key(dev, BTN_LEFT, left);
		input_report_key(dev, BTN_RIGHT, right);
		input_report_key(dev, BTN_MIDDLE, middle);
	}

	input_sync(dev);
	return;
}

static void alps_decode_buttons_v3(struct alps_fields *f, unsigned char *p)
{
	f->left = !!(p[3] & 0x01);
	f->right = !!(p[3] & 0x02);
	f->middle = !!(p[3] & 0x04);

	f->ts_left = !!(p[3] & 0x10);
	f->ts_right = !!(p[3] & 0x20);
	f->ts_middle = !!(p[3] & 0x40);
}

static void alps_decode_pinnacle(struct alps_fields *f, unsigned char *p)
{
	f->first_mp = !!(p[4] & 0x40);
	f->is_mp = !!(p[0] & 0x40);

	f->fingers = (p[5] & 0x3) + 1;
	f->x_map = ((p[4] & 0x7e) << 8) |
		   ((p[1] & 0x7f) << 2) |
		   ((p[0] & 0x30) >> 4);
	f->y_map = ((p[3] & 0x70) << 4) |
		   ((p[2] & 0x7f) << 1) |
		   (p[4] & 0x01);

	f->x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) |
	       ((p[0] & 0x30) >> 4);
	f->y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f);
	f->z = p[5] & 0x7f;

	alps_decode_buttons_v3(f, p);
}

static void alps_decode_rushmore(struct alps_fields *f, unsigned char *p)
{
	alps_decode_pinnacle(f, p);

	f->x_map |= (p[5] & 0x10) << 11;
	f->y_map |= (p[5] & 0x20) << 6;
}

static void alps_process_touchpad_packet_v3(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;
	unsigned char *packet = psmouse->packet;
	struct input_dev *dev = psmouse->dev;
	struct input_dev *dev2 = priv->dev2;
	int x1 = 0, y1 = 0, x2 = 0, y2 = 0;
	int fingers = 0, bmap_fingers;
	struct alps_fields f;

	priv->decode_fields(&f, packet);

	/*
	 * There's no single feature of touchpad position and bitmap packets
	 * that can be used to distinguish between them. We rely on the fact
	 * that a bitmap packet should always follow a position packet with
	 * bit 6 of packet[4] set.
	 */
	if (priv->multi_packet) {
		/*
		 * Sometimes a position packet will indicate a multi-packet
		 * sequence, but then what follows is another position
		 * packet. Check for this, and when it happens process the
		 * position packet as usual.
		 */
		if (f.is_mp) {
			fingers = f.fingers;
			bmap_fingers = alps_process_bitmap(priv,
							   f.x_map, f.y_map,
							   &x1, &y1, &x2, &y2);

			/*
			 * We shouldn't report more than one finger if
			 * we don't have two coordinates.
			 */
			if (fingers > 1 && bmap_fingers < 2)
				fingers = bmap_fingers;

			/* Now process position packet */
			priv->decode_fields(&f, priv->multi_data);
		} else {
			priv->multi_packet = 0;
		}
	}

	/*
	 * Bit 6 of byte 0 is not usually set in position packets. The only
	 * times it seems to be set is in situations where the data is
	 * suspect anyway, e.g. a palm resting flat on the touchpad. Given
	 * this combined with the fact that this bit is useful for filtering
	 * out misidentified bitmap packets, we reject anything with this
	 * bit set.
	 */
	if (f.is_mp)
		return;

	if (!priv->multi_packet && f.first_mp) {
		priv->multi_packet = 1;
		memcpy(priv->multi_data, packet, sizeof(priv->multi_data));
		return;
	}

	priv->multi_packet = 0;

	/*
	 * Sometimes the hardware sends a single packet with z = 0
	 * in the middle of a stream. Real releases generate packets
	 * with x, y, and z all zero, so these seem to be flukes.
	 * Ignore them.
	 */
	if (f.x && f.y && !f.z)
		return;

	/*
	 * If we don't have MT data or the bitmaps were empty, we have
	 * to rely on ST data.
	 */
	if (!fingers) {
		x1 = f.x;
		y1 = f.y;
		fingers = f.z > 0 ? 1 : 0;
	}

	if (f.z >= 64)
		input_report_key(dev, BTN_TOUCH, 1);
	else
		input_report_key(dev, BTN_TOUCH, 0);

	alps_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);

	input_mt_report_finger_count(dev, fingers);

	input_report_key(dev, BTN_LEFT, f.left);
	input_report_key(dev, BTN_RIGHT, f.right);
	input_report_key(dev, BTN_MIDDLE, f.middle);

	if (f.z > 0) {
		input_report_abs(dev, ABS_X, f.x);
		input_report_abs(dev, ABS_Y, f.y);
	}
	input_report_abs(dev, ABS_PRESSURE, f.z);

	input_sync(dev);

	if (!(priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS)) {
		input_report_key(dev2, BTN_LEFT, f.ts_left);
		input_report_key(dev2, BTN_RIGHT, f.ts_right);
		input_report_key(dev2, BTN_MIDDLE, f.ts_middle);
		input_sync(dev2);
	}
}

static void alps_process_packet_v3(struct psmouse *psmouse)
{
	unsigned char *packet = psmouse->packet;

	/*
	 * v3 protocol packets come in three types, two representing
	 * touchpad data and one representing trackstick data.
	 * Trackstick packets seem to be distinguished by always
	 * having 0x3f in the last byte. This value has never been
	 * observed in the last byte of either of the other types
	 * of packets.
	 */
	if (packet[5] == 0x3f) {
		alps_process_trackstick_packet_v3(psmouse);
		return;
	}

	alps_process_touchpad_packet_v3(psmouse);
}

static void alps_process_packet_v4(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;
	unsigned char *packet = psmouse->packet;
	struct input_dev *dev = psmouse->dev;
	int offset;
	int x, y, z;
	int left, right;
	int x1, y1, x2, y2;
	int fingers = 0;
	unsigned int x_bitmap, y_bitmap;

	/*
	 * v4 has a 6-byte encoding for bitmap data, but this data is
	 * broken up between 3 normal packets. Use priv->multi_packet to
	 * track our position in the bitmap packet.
	 */
	if (packet[6] & 0x40) {
		/* sync, reset position */
		priv->multi_packet = 0;
	}

	if (WARN_ON_ONCE(priv->multi_packet > 2))
		return;

	offset = 2 * priv->multi_packet;
	priv->multi_data[offset] = packet[6];
	priv->multi_data[offset + 1] = packet[7];

	if (++priv->multi_packet > 2) {
		priv->multi_packet = 0;

		x_bitmap = ((priv->multi_data[2] & 0x1f) << 10) |
			   ((priv->multi_data[3] & 0x60) << 3) |
			   ((priv->multi_data[0] & 0x3f) << 2) |
			   ((priv->multi_data[1] & 0x60) >> 5);
		y_bitmap = ((priv->multi_data[5] & 0x01) << 10) |
			   ((priv->multi_data[3] & 0x1f) << 5) |
			    (priv->multi_data[1] & 0x1f);

		fingers = alps_process_bitmap(priv, x_bitmap, y_bitmap,
					      &x1, &y1, &x2, &y2);

		/* Store MT data.*/
		priv->fingers = fingers;
		priv->x1 = x1;
		priv->x2 = x2;
		priv->y1 = y1;
		priv->y2 = y2;
	}

	left = packet[4] & 0x01;
	right = packet[4] & 0x02;

	x = ((packet[1] & 0x7f) << 4) | ((packet[3] & 0x30) >> 2) |
	    ((packet[0] & 0x30) >> 4);
	y = ((packet[2] & 0x7f) << 4) | (packet[3] & 0x0f);
	z = packet[5] & 0x7f;

	/*
	 * If there were no contacts in the bitmap, use ST
	 * points in MT reports.
	 * If there were two contacts or more, report MT data.
	 */
	if (priv->fingers < 2) {
		x1 = x;
		y1 = y;
		fingers = z > 0 ? 1 : 0;
	} else {
		fingers = priv->fingers;
		x1 = priv->x1;
		x2 = priv->x2;
		y1 = priv->y1;
		y2 = priv->y2;
	}

	if (z >= 64)
		input_report_key(dev, BTN_TOUCH, 1);
	else
		input_report_key(dev, BTN_TOUCH, 0);

	alps_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);

	input_mt_report_finger_count(dev, fingers);

	input_report_key(dev, BTN_LEFT, left);
	input_report_key(dev, BTN_RIGHT, right);

	if (z > 0) {
		input_report_abs(dev, ABS_X, x);
		input_report_abs(dev, ABS_Y, y);
	}
	input_report_abs(dev, ABS_PRESSURE, z);

	input_sync(dev);
}

static void alps_report_bare_ps2_packet(struct psmouse *psmouse,
					unsigned char packet[],
					bool report_buttons)
{
	struct alps_data *priv = psmouse->private;
	struct input_dev *dev2 = priv->dev2;

	if (report_buttons)
		alps_report_buttons(psmouse, dev2, psmouse->dev,
				packet[0] & 1, packet[0] & 2, packet[0] & 4);

	input_report_rel(dev2, REL_X,
		packet[1] ? packet[1] - ((packet[0] << 4) & 0x100) : 0);
	input_report_rel(dev2, REL_Y,
		packet[2] ? ((packet[0] << 3) & 0x100) - packet[2] : 0);

	input_sync(dev2);
}

static psmouse_ret_t alps_handle_interleaved_ps2(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;

	if (psmouse->pktcnt < 6)
		return PSMOUSE_GOOD_DATA;

	if (psmouse->pktcnt == 6) {
		/*
		 * Start a timer to flush the packet if it ends up last
		 * 6-byte packet in the stream. Timer needs to fire
		 * psmouse core times out itself. 20 ms should be enough
		 * to decide if we are getting more data or not.
		 */
		mod_timer(&priv->timer, jiffies + msecs_to_jiffies(20));
		return PSMOUSE_GOOD_DATA;
	}

	del_timer(&priv->timer);

	if (psmouse->packet[6] & 0x80) {

		/*
		 * Highest bit is set - that means we either had
		 * complete ALPS packet and this is start of the
		 * next packet or we got garbage.
		 */

		if (((psmouse->packet[3] |
		      psmouse->packet[4] |
		      psmouse->packet[5]) & 0x80) ||
		    (!alps_is_valid_first_byte(priv, psmouse->packet[6]))) {
			psmouse_dbg(psmouse,
				    "refusing packet %4ph (suspected interleaved ps/2)\n",
				    psmouse->packet + 3);
			return PSMOUSE_BAD_DATA;
		}

		priv->process_packet(psmouse);

		/* Continue with the next packet */
		psmouse->packet[0] = psmouse->packet[6];
		psmouse->pktcnt = 1;

	} else {

		/*
		 * High bit is 0 - that means that we indeed got a PS/2
		 * packet in the middle of ALPS packet.
		 *
		 * There is also possibility that we got 6-byte ALPS
		 * packet followed  by 3-byte packet from trackpoint. We
		 * can not distinguish between these 2 scenarios but
		 * because the latter is unlikely to happen in course of
		 * normal operation (user would need to press all
		 * buttons on the pad and start moving trackpoint
		 * without touching the pad surface) we assume former.
		 * Even if we are wrong the wost thing that would happen
		 * the cursor would jump but we should not get protocol
		 * de-synchronization.
		 */

		alps_report_bare_ps2_packet(psmouse, &psmouse->packet[3],
					    false);

		/*
		 * Continue with the standard ALPS protocol handling,
		 * but make sure we won't process it as an interleaved
		 * packet again, which may happen if all buttons are
		 * pressed. To avoid this let's reset the 4th bit which
		 * is normally 1.
		 */
		psmouse->packet[3] = psmouse->packet[6] & 0xf7;
		psmouse->pktcnt = 4;
	}

	return PSMOUSE_GOOD_DATA;
}

static void alps_flush_packet(unsigned long data)
{
	struct psmouse *psmouse = (struct psmouse *)data;
	struct alps_data *priv = psmouse->private;

	serio_pause_rx(psmouse->ps2dev.serio);

	if (psmouse->pktcnt == psmouse->pktsize) {

		/*
		 * We did not any more data in reasonable amount of time.
		 * Validate the last 3 bytes and process as a standard
		 * ALPS packet.
		 */
		if ((psmouse->packet[3] |
		     psmouse->packet[4] |
		     psmouse->packet[5]) & 0x80) {
			psmouse_dbg(psmouse,
				    "refusing packet %3ph (suspected interleaved ps/2)\n",
				    psmouse->packet + 3);
		} else {
			priv->process_packet(psmouse);
		}
		psmouse->pktcnt = 0;
	}

	serio_continue_rx(psmouse->ps2dev.serio);
}

static psmouse_ret_t alps_process_byte(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;

	if ((psmouse->packet[0] & 0xc8) == 0x08) { /* PS/2 packet */
		if (psmouse->pktcnt == 3) {
			alps_report_bare_ps2_packet(psmouse, psmouse->packet,
						    true);
			return PSMOUSE_FULL_PACKET;
		}
		return PSMOUSE_GOOD_DATA;
	}

	/* Check for PS/2 packet stuffed in the middle of ALPS packet. */

	if ((priv->flags & ALPS_PS2_INTERLEAVED) &&
	    psmouse->pktcnt >= 4 && (psmouse->packet[3] & 0x0f) == 0x0f) {
		return alps_handle_interleaved_ps2(psmouse);
	}

	if (!alps_is_valid_first_byte(priv, psmouse->packet[0])) {
		psmouse_dbg(psmouse,
			    "refusing packet[0] = %x (mask0 = %x, byte0 = %x)\n",
			    psmouse->packet[0], priv->mask0, priv->byte0);
		return PSMOUSE_BAD_DATA;
	}

	/* Bytes 2 - pktsize should have 0 in the highest bit */
	if (psmouse->pktcnt >= 2 && psmouse->pktcnt <= psmouse->pktsize &&
	    (psmouse->packet[psmouse->pktcnt - 1] & 0x80)) {
		psmouse_dbg(psmouse, "refusing packet[%i] = %x\n",
			    psmouse->pktcnt - 1,
			    psmouse->packet[psmouse->pktcnt - 1]);
		return PSMOUSE_BAD_DATA;
	}

	if (psmouse->pktcnt == psmouse->pktsize) {
		priv->process_packet(psmouse);
		return PSMOUSE_FULL_PACKET;
	}

	return PSMOUSE_GOOD_DATA;
}

static int alps_command_mode_send_nibble(struct psmouse *psmouse, int nibble)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	struct alps_data *priv = psmouse->private;
	int command;
	unsigned char *param;
	unsigned char dummy[4];

	BUG_ON(nibble > 0xf);

	command = priv->nibble_commands[nibble].command;
	param = (command & 0x0f00) ?
		dummy : (unsigned char *)&priv->nibble_commands[nibble].data;

	if (ps2_command(ps2dev, param, command))
		return -1;

	return 0;
}

static int alps_command_mode_set_addr(struct psmouse *psmouse, int addr)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	struct alps_data *priv = psmouse->private;
	int i, nibble;

	if (ps2_command(ps2dev, NULL, priv->addr_command))
		return -1;

	for (i = 12; i >= 0; i -= 4) {
		nibble = (addr >> i) & 0xf;
		if (alps_command_mode_send_nibble(psmouse, nibble))
			return -1;
	}

	return 0;
}

static int __alps_command_mode_read_reg(struct psmouse *psmouse, int addr)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	unsigned char param[4];

	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
		return -1;

	/*
	 * The address being read is returned in the first two bytes
	 * of the result. Check that this address matches the expected
	 * address.
	 */
	if (addr != ((param[0] << 8) | param[1]))
		return -1;

	return param[2];
}

static int alps_command_mode_read_reg(struct psmouse *psmouse, int addr)
{
	if (alps_command_mode_set_addr(psmouse, addr))
		return -1;
	return __alps_command_mode_read_reg(psmouse, addr);
}

static int __alps_command_mode_write_reg(struct psmouse *psmouse, u8 value)
{
	if (alps_command_mode_send_nibble(psmouse, (value >> 4) & 0xf))
		return -1;
	if (alps_command_mode_send_nibble(psmouse, value & 0xf))
		return -1;
	return 0;
}

static int alps_command_mode_write_reg(struct psmouse *psmouse, int addr,
				       u8 value)
{
	if (alps_command_mode_set_addr(psmouse, addr))
		return -1;
	return __alps_command_mode_write_reg(psmouse, value);
}

static int alps_rpt_cmd(struct psmouse *psmouse, int init_command,
			int repeated_command, unsigned char *param)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;

	param[0] = 0;
	if (init_command && ps2_command(ps2dev, param, init_command))
		return -EIO;

	if (ps2_command(ps2dev,  NULL, repeated_command) ||
	    ps2_command(ps2dev,  NULL, repeated_command) ||
	    ps2_command(ps2dev,  NULL, repeated_command))
		return -EIO;

	param[0] = param[1] = param[2] = 0xff;
	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
		return -EIO;

	psmouse_dbg(psmouse, "%2.2X report: %2.2x %2.2x %2.2x\n",
		    repeated_command, param[0], param[1], param[2]);
	return 0;
}

static int alps_enter_command_mode(struct psmouse *psmouse,
				   unsigned char *resp)
{
	unsigned char param[4];

	if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_RESET_WRAP, param)) {
		psmouse_err(psmouse, "failed to enter command mode\n");
		return -1;
	}

	if (param[0] != 0x88 || (param[1] != 0x07 && param[1] != 0x08)) {
		psmouse_dbg(psmouse,
			    "unknown response while entering command mode\n");
		return -1;
	}

	if (resp)
		*resp = param[2];
	return 0;
}

static inline int alps_exit_command_mode(struct psmouse *psmouse)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM))
		return -1;
	return 0;
}

/*
 * For DualPoint devices select the device that should respond to
 * subsequent commands. It looks like glidepad is behind stickpointer,
 * I'd thought it would be other way around...
 */
static int alps_passthrough_mode_v2(struct psmouse *psmouse, bool enable)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	int cmd = enable ? PSMOUSE_CMD_SETSCALE21 : PSMOUSE_CMD_SETSCALE11;

	if (ps2_command(ps2dev, NULL, cmd) ||
	    ps2_command(ps2dev, NULL, cmd) ||
	    ps2_command(ps2dev, NULL, cmd) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE))
		return -1;

	/* we may get 3 more bytes, just ignore them */
	ps2_drain(ps2dev, 3, 100);

	return 0;
}

static int alps_absolute_mode_v1_v2(struct psmouse *psmouse)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;

	/* Try ALPS magic knock - 4 disable before enable */
	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE))
		return -1;

	/*
	 * Switch mouse to poll (remote) mode so motion data will not
	 * get in our way
	 */
	return ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETPOLL);
}

static int alps_get_status(struct psmouse *psmouse, char *param)
{
	/* Get status: 0xF5 0xF5 0xF5 0xE9 */
	if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_DISABLE, param))
		return -1;

	return 0;
}

/*
 * Turn touchpad tapping on or off. The sequences are:
 * 0xE9 0xF5 0xF5 0xF3 0x0A to enable,
 * 0xE9 0xF5 0xF5 0xE8 0x00 to disable.
 * My guess that 0xE9 (GetInfo) is here as a sync point.
 * For models that also have stickpointer (DualPoints) its tapping
 * is controlled separately (0xE6 0xE6 0xE6 0xF3 0x14|0x0A) but
 * we don't fiddle with it.
 */
static int alps_tap_mode(struct psmouse *psmouse, int enable)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	int cmd = enable ? PSMOUSE_CMD_SETRATE : PSMOUSE_CMD_SETRES;
	unsigned char tap_arg = enable ? 0x0A : 0x00;
	unsigned char param[4];

	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
	    ps2_command(ps2dev, &tap_arg, cmd))
		return -1;

	if (alps_get_status(psmouse, param))
		return -1;

	return 0;
}

/*
 * alps_poll() - poll the touchpad for current motion packet.
 * Used in resync.
 */
static int alps_poll(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;
	unsigned char buf[sizeof(psmouse->packet)];
	bool poll_failed;

	if (priv->flags & ALPS_PASS)
		alps_passthrough_mode_v2(psmouse, true);

	poll_failed = ps2_command(&psmouse->ps2dev, buf,
				  PSMOUSE_CMD_POLL | (psmouse->pktsize << 8)) < 0;

	if (priv->flags & ALPS_PASS)
		alps_passthrough_mode_v2(psmouse, false);

	if (poll_failed || (buf[0] & priv->mask0) != priv->byte0)
		return -1;

	if ((psmouse->badbyte & 0xc8) == 0x08) {
/*
 * Poll the track stick ...
 */
		if (ps2_command(&psmouse->ps2dev, buf, PSMOUSE_CMD_POLL | (3 << 8)))
			return -1;
	}

	memcpy(psmouse->packet, buf, sizeof(buf));
	return 0;
}

static int alps_hw_init_v1_v2(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;

	if ((priv->flags & ALPS_PASS) &&
	    alps_passthrough_mode_v2(psmouse, true)) {
		return -1;
	}

	if (alps_tap_mode(psmouse, true)) {
		psmouse_warn(psmouse, "Failed to enable hardware tapping\n");
		return -1;
	}

	if (alps_absolute_mode_v1_v2(psmouse)) {
		psmouse_err(psmouse, "Failed to enable absolute mode\n");
		return -1;
	}

	if ((priv->flags & ALPS_PASS) &&
	    alps_passthrough_mode_v2(psmouse, false)) {
		return -1;
	}

	/* ALPS needs stream mode, otherwise it won't report any data */
	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)) {
		psmouse_err(psmouse, "Failed to enable stream mode\n");
		return -1;
	}

	return 0;
}

/*
 * Enable or disable passthrough mode to the trackstick.
 */
static int alps_passthrough_mode_v3(struct psmouse *psmouse,
				    int reg_base, bool enable)
{
	int reg_val, ret = -1;

	if (alps_enter_command_mode(psmouse, NULL))
		return -1;

	reg_val = alps_command_mode_read_reg(psmouse, reg_base + 0x0008);
	if (reg_val == -1)
		goto error;

	if (enable)
		reg_val |= 0x01;
	else
		reg_val &= ~0x01;

	ret = __alps_command_mode_write_reg(psmouse, reg_val);

error:
	if (alps_exit_command_mode(psmouse))
		ret = -1;
	return ret;
}

/* Must be in command mode when calling this function */
static int alps_absolute_mode_v3(struct psmouse *psmouse)
{
	int reg_val;

	reg_val = alps_command_mode_read_reg(psmouse, 0x0004);
	if (reg_val == -1)
		return -1;

	reg_val |= 0x06;
	if (__alps_command_mode_write_reg(psmouse, reg_val))
		return -1;

	return 0;
}

static int alps_probe_trackstick_v3(struct psmouse *psmouse, int reg_base)
{
	int ret = -EIO, reg_val;

	if (alps_enter_command_mode(psmouse, NULL))
		goto error;

	reg_val = alps_command_mode_read_reg(psmouse, reg_base + 0x08);
	if (reg_val == -1)
		goto error;

	/* bit 7: trackstick is present */
	ret = reg_val & 0x80 ? 0 : -ENODEV;

error:
	alps_exit_command_mode(psmouse);
	return ret;
}

static int alps_setup_trackstick_v3(struct psmouse *psmouse, int reg_base)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	int ret = 0;
	unsigned char param[4];

	if (alps_passthrough_mode_v3(psmouse, reg_base, true))
		return -EIO;

	/*
	 * E7 report for the trackstick
	 *
	 * There have been reports of failures to seem to trace back
	 * to the above trackstick check failing. When these occur
	 * this E7 report fails, so when that happens we continue
	 * with the assumption that there isn't a trackstick after
	 * all.
	 */
	if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_SETSCALE21, param)) {
		psmouse_warn(psmouse, "trackstick E7 report failed\n");
		ret = -ENODEV;
	} else {
		psmouse_dbg(psmouse,
			    "trackstick E7 report: %2.2x %2.2x %2.2x\n",
			    param[0], param[1], param[2]);

		/*
		 * Not sure what this does, but it is absolutely
		 * essential. Without it, the touchpad does not
		 * work at all and the trackstick just emits normal
		 * PS/2 packets.
		 */
		if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
		    alps_command_mode_send_nibble(psmouse, 0x9) ||
		    alps_command_mode_send_nibble(psmouse, 0x4)) {
			psmouse_err(psmouse,
				    "Error sending magic E6 sequence\n");
			ret = -EIO;
			goto error;
		}

		/*
		 * This ensures the trackstick packets are in the format
		 * supported by this driver. If bit 1 isn't set the packet
		 * format is different.
		 */
		if (alps_enter_command_mode(psmouse, NULL) ||
		    alps_command_mode_write_reg(psmouse,
						reg_base + 0x08, 0x82) ||
		    alps_exit_command_mode(psmouse))
			ret = -EIO;
	}

error:
	if (alps_passthrough_mode_v3(psmouse, reg_base, false))
		ret = -EIO;

	return ret;
}

static int alps_hw_init_v3(struct psmouse *psmouse)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	int reg_val;
	unsigned char param[4];

	reg_val = alps_probe_trackstick_v3(psmouse, ALPS_REG_BASE_PINNACLE);
	if (reg_val == -EIO)
		goto error;
	if (reg_val == 0 &&
	    alps_setup_trackstick_v3(psmouse, ALPS_REG_BASE_PINNACLE) == -EIO)
		goto error;

	if (alps_enter_command_mode(psmouse, NULL) ||
	    alps_absolute_mode_v3(psmouse)) {
		psmouse_err(psmouse, "Failed to enter absolute mode\n");
		goto error;
	}

	reg_val = alps_command_mode_read_reg(psmouse, 0x0006);
	if (reg_val == -1)
		goto error;
	if (__alps_command_mode_write_reg(psmouse, reg_val | 0x01))
		goto error;

	reg_val = alps_command_mode_read_reg(psmouse, 0x0007);
	if (reg_val == -1)
		goto error;
	if (__alps_command_mode_write_reg(psmouse, reg_val | 0x01))
		goto error;

	if (alps_command_mode_read_reg(psmouse, 0x0144) == -1)
		goto error;
	if (__alps_command_mode_write_reg(psmouse, 0x04))
		goto error;

	if (alps_command_mode_read_reg(psmouse, 0x0159) == -1)
		goto error;
	if (__alps_command_mode_write_reg(psmouse, 0x03))
		goto error;

	if (alps_command_mode_read_reg(psmouse, 0x0163) == -1)
		goto error;
	if (alps_command_mode_write_reg(psmouse, 0x0163, 0x03))
		goto error;

	if (alps_command_mode_read_reg(psmouse, 0x0162) == -1)
		goto error;
	if (alps_command_mode_write_reg(psmouse, 0x0162, 0x04))
		goto error;

	alps_exit_command_mode(psmouse);

	/* Set rate and enable data reporting */
	param[0] = 0x64;
	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
		psmouse_err(psmouse, "Failed to enable data reporting\n");
		return -1;
	}

	return 0;

error:
	/*
	 * Leaving the touchpad in command mode will essentially render
	 * it unusable until the machine reboots, so exit it here just
	 * to be safe
	 */
	alps_exit_command_mode(psmouse);
	return -1;
}

static int alps_hw_init_rushmore_v3(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	int reg_val, ret = -1;

	if (priv->flags & ALPS_DUALPOINT) {
		reg_val = alps_setup_trackstick_v3(psmouse,
						   ALPS_REG_BASE_RUSHMORE);
		if (reg_val == -EIO)
			goto error;
		if (reg_val == -ENODEV)
			priv->flags &= ~ALPS_DUALPOINT;
	}

	if (alps_enter_command_mode(psmouse, NULL) ||
	    alps_command_mode_read_reg(psmouse, 0xc2d9) == -1 ||
	    alps_command_mode_write_reg(psmouse, 0xc2cb, 0x00))
		goto error;

	reg_val = alps_command_mode_read_reg(psmouse, 0xc2c6);
	if (reg_val == -1)
		goto error;
	if (__alps_command_mode_write_reg(psmouse, reg_val & 0xfd))
		goto error;

	if (alps_command_mode_write_reg(psmouse, 0xc2c9, 0x64))
		goto error;

	/* enter absolute mode */
	reg_val = alps_command_mode_read_reg(psmouse, 0xc2c4);
	if (reg_val == -1)
		goto error;
	if (__alps_command_mode_write_reg(psmouse, reg_val | 0x02))
		goto error;

	alps_exit_command_mode(psmouse);
	return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);

error:
	alps_exit_command_mode(psmouse);
	return ret;
}

/* Must be in command mode when calling this function */
static int alps_absolute_mode_v4(struct psmouse *psmouse)
{
	int reg_val;

	reg_val = alps_command_mode_read_reg(psmouse, 0x0004);
	if (reg_val == -1)
		return -1;

	reg_val |= 0x02;
	if (__alps_command_mode_write_reg(psmouse, reg_val))
		return -1;

	return 0;
}

static int alps_hw_init_v4(struct psmouse *psmouse)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	unsigned char param[4];

	if (alps_enter_command_mode(psmouse, NULL))
		goto error;

	if (alps_absolute_mode_v4(psmouse)) {
		psmouse_err(psmouse, "Failed to enter absolute mode\n");
		goto error;
	}

	if (alps_command_mode_write_reg(psmouse, 0x0007, 0x8c))
		goto error;

	if (alps_command_mode_write_reg(psmouse, 0x0149, 0x03))
		goto error;

	if (alps_command_mode_write_reg(psmouse, 0x0160, 0x03))
		goto error;

	if (alps_command_mode_write_reg(psmouse, 0x017f, 0x15))
		goto error;

	if (alps_command_mode_write_reg(psmouse, 0x0151, 0x01))
		goto error;

	if (alps_command_mode_write_reg(psmouse, 0x0168, 0x03))
		goto error;

	if (alps_command_mode_write_reg(psmouse, 0x014a, 0x03))
		goto error;

	if (alps_command_mode_write_reg(psmouse, 0x0161, 0x03))
		goto error;

	alps_exit_command_mode(psmouse);

	/*
	 * This sequence changes the output from a 9-byte to an
	 * 8-byte format. All the same data seems to be present,
	 * just in a more compact format.
	 */
	param[0] = 0xc8;
	param[1] = 0x64;
	param[2] = 0x50;
	if (ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
	    ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE) ||
	    ps2_command(ps2dev, &param[2], PSMOUSE_CMD_SETRATE) ||
	    ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
		return -1;

	/* Set rate and enable data reporting */
	param[0] = 0x64;
	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE) ||
	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
		psmouse_err(psmouse, "Failed to enable data reporting\n");
		return -1;
	}

	return 0;

error:
	/*
	 * Leaving the touchpad in command mode will essentially render
	 * it unusable until the machine reboots, so exit it here just
	 * to be safe
	 */
	alps_exit_command_mode(psmouse);
	return -1;
}

static void alps_set_defaults(struct alps_data *priv)
{
	priv->byte0 = 0x8f;
	priv->mask0 = 0x8f;
	priv->flags = ALPS_DUALPOINT;

	priv->x_max = 2000;
	priv->y_max = 1400;
	priv->x_bits = 15;
	priv->y_bits = 11;

	switch (priv->proto_version) {
	case ALPS_PROTO_V1:
	case ALPS_PROTO_V2:
		priv->hw_init = alps_hw_init_v1_v2;
		priv->process_packet = alps_process_packet_v1_v2;
		priv->set_abs_params = alps_set_abs_params_st;
		break;
	case ALPS_PROTO_V3:
		priv->hw_init = alps_hw_init_v3;
		priv->process_packet = alps_process_packet_v3;
		priv->set_abs_params = alps_set_abs_params_mt;
		priv->decode_fields = alps_decode_pinnacle;
		priv->nibble_commands = alps_v3_nibble_commands;
		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
		break;
	case ALPS_PROTO_V4:
		priv->hw_init = alps_hw_init_v4;
		priv->process_packet = alps_process_packet_v4;
		priv->set_abs_params = alps_set_abs_params_mt;
		priv->nibble_commands = alps_v4_nibble_commands;
		priv->addr_command = PSMOUSE_CMD_DISABLE;
		break;
	}
}

static int alps_match_table(struct psmouse *psmouse, struct alps_data *priv,
			    unsigned char *e7, unsigned char *ec)
{
	const struct alps_model_info *model;
	int i;

	for (i = 0; i < ARRAY_SIZE(alps_model_data); i++) {
		model = &alps_model_data[i];

		if (!memcmp(e7, model->signature, sizeof(model->signature)) &&
		    (!model->command_mode_resp ||
		     model->command_mode_resp == ec[2])) {

			priv->proto_version = model->proto_version;
			alps_set_defaults(priv);

			priv->flags = model->flags;
			priv->byte0 = model->byte0;
			priv->mask0 = model->mask0;

			return 0;
		}
	}

	return -EINVAL;
}

static int alps_identify(struct psmouse *psmouse, struct alps_data *priv)
{
	unsigned char e6[4], e7[4], ec[4];

	/*
	 * First try "E6 report".
	 * ALPS should return 0,0,10 or 0,0,100 if no buttons are pressed.
	 * The bits 0-2 of the first byte will be 1s if some buttons are
	 * pressed.
	 */
	if (alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
			 PSMOUSE_CMD_SETSCALE11, e6))
		return -EIO;

	if ((e6[0] & 0xf8) != 0 || e6[1] != 0 || (e6[2] != 10 && e6[2] != 100))
		return -EINVAL;

	/*
	 * Now get the "E7" and "EC" reports.  These will uniquely identify
	 * most ALPS touchpads.
	 */
	if (alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
			 PSMOUSE_CMD_SETSCALE21, e7) ||
	    alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
			 PSMOUSE_CMD_RESET_WRAP, ec) ||
	    alps_exit_command_mode(psmouse))
		return -EIO;

	if (alps_match_table(psmouse, priv, e7, ec) == 0) {
		return 0;
	} else if (ec[0] == 0x88 && ec[1] == 0x08) {
		priv->proto_version = ALPS_PROTO_V3;
		alps_set_defaults(priv);

		priv->hw_init = alps_hw_init_rushmore_v3;
		priv->decode_fields = alps_decode_rushmore;
		priv->x_bits = 16;
		priv->y_bits = 12;

		/* hack to make addr_command, nibble_command available */
		psmouse->private = priv;

		if (alps_probe_trackstick_v3(psmouse, ALPS_REG_BASE_RUSHMORE))
			priv->flags &= ~ALPS_DUALPOINT;

		return 0;
	} else if (ec[0] == 0x88 && ec[1] == 0x07 &&
		   ec[2] >= 0x90 && ec[2] <= 0x9d) {
		priv->proto_version = ALPS_PROTO_V3;
		alps_set_defaults(priv);

		return 0;
	}

	psmouse_info(psmouse,
		"Unknown ALPS touchpad: E7=%2.2x %2.2x %2.2x, EC=%2.2x %2.2x %2.2x\n",
		e7[0], e7[1], e7[2], ec[0], ec[1], ec[2]);

	return -EINVAL;
}

static int alps_reconnect(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;

	psmouse_reset(psmouse);

	if (alps_identify(psmouse, priv) < 0)
		return -1;

	return priv->hw_init(psmouse);
}

static void alps_disconnect(struct psmouse *psmouse)
{
	struct alps_data *priv = psmouse->private;

	psmouse_reset(psmouse);
	del_timer_sync(&priv->timer);
	input_unregister_device(priv->dev2);
	kfree(priv);
}

static void alps_set_abs_params_st(struct alps_data *priv,
				   struct input_dev *dev1)
{
	input_set_abs_params(dev1, ABS_X, 0, 1023, 0, 0);
	input_set_abs_params(dev1, ABS_Y, 0, 767, 0, 0);
}

static void alps_set_abs_params_mt(struct alps_data *priv,
				   struct input_dev *dev1)
{
	set_bit(INPUT_PROP_SEMI_MT, dev1->propbit);
	input_mt_init_slots(dev1, 2, 0);
	input_set_abs_params(dev1, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0);
	input_set_abs_params(dev1, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0);

	set_bit(BTN_TOOL_DOUBLETAP, dev1->keybit);
	set_bit(BTN_TOOL_TRIPLETAP, dev1->keybit);
	set_bit(BTN_TOOL_QUADTAP, dev1->keybit);

	input_set_abs_params(dev1, ABS_X, 0, priv->x_max, 0, 0);
	input_set_abs_params(dev1, ABS_Y, 0, priv->y_max, 0, 0);
}

int alps_init(struct psmouse *psmouse)
{
	struct alps_data *priv;
	struct input_dev *dev1 = psmouse->dev, *dev2;

	priv = kzalloc(sizeof(struct alps_data), GFP_KERNEL);
	dev2 = input_allocate_device();
	if (!priv || !dev2)
		goto init_fail;

	priv->dev2 = dev2;
	setup_timer(&priv->timer, alps_flush_packet, (unsigned long)psmouse);

	psmouse->private = priv;

	psmouse_reset(psmouse);

	if (alps_identify(psmouse, priv) < 0)
		goto init_fail;

	if (priv->hw_init(psmouse))
		goto init_fail;

	/*
	 * Undo part of setup done for us by psmouse core since touchpad
	 * is not a relative device.
	 */
	__clear_bit(EV_REL, dev1->evbit);
	__clear_bit(REL_X, dev1->relbit);
	__clear_bit(REL_Y, dev1->relbit);

	/*
	 * Now set up our capabilities.
	 */
	dev1->evbit[BIT_WORD(EV_KEY)] |= BIT_MASK(EV_KEY);
	dev1->keybit[BIT_WORD(BTN_TOUCH)] |= BIT_MASK(BTN_TOUCH);
	dev1->keybit[BIT_WORD(BTN_TOOL_FINGER)] |= BIT_MASK(BTN_TOOL_FINGER);
	dev1->keybit[BIT_WORD(BTN_LEFT)] |=
		BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);

	dev1->evbit[BIT_WORD(EV_ABS)] |= BIT_MASK(EV_ABS);

	priv->set_abs_params(priv, dev1);
	input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);

	if (priv->flags & ALPS_WHEEL) {
		dev1->evbit[BIT_WORD(EV_REL)] |= BIT_MASK(EV_REL);
		dev1->relbit[BIT_WORD(REL_WHEEL)] |= BIT_MASK(REL_WHEEL);
	}

	if (priv->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
		dev1->keybit[BIT_WORD(BTN_FORWARD)] |= BIT_MASK(BTN_FORWARD);
		dev1->keybit[BIT_WORD(BTN_BACK)] |= BIT_MASK(BTN_BACK);
	}

	if (priv->flags & ALPS_FOUR_BUTTONS) {
		dev1->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_0);
		dev1->keybit[BIT_WORD(BTN_1)] |= BIT_MASK(BTN_1);
		dev1->keybit[BIT_WORD(BTN_2)] |= BIT_MASK(BTN_2);
		dev1->keybit[BIT_WORD(BTN_3)] |= BIT_MASK(BTN_3);
	} else {
		dev1->keybit[BIT_WORD(BTN_MIDDLE)] |= BIT_MASK(BTN_MIDDLE);
	}

	snprintf(priv->phys, sizeof(priv->phys), "%s/input1", psmouse->ps2dev.serio->phys);
	dev2->phys = priv->phys;
	dev2->name = (priv->flags & ALPS_DUALPOINT) ?
		     "DualPoint Stick" : "PS/2 Mouse";
	dev2->id.bustype = BUS_I8042;
	dev2->id.vendor  = 0x0002;
	dev2->id.product = PSMOUSE_ALPS;
	dev2->id.version = 0x0000;
	dev2->dev.parent = &psmouse->ps2dev.serio->dev;

	dev2->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
	dev2->relbit[BIT_WORD(REL_X)] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
	dev2->keybit[BIT_WORD(BTN_LEFT)] =
		BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);

	if (input_register_device(priv->dev2))
		goto init_fail;

	psmouse->protocol_handler = alps_process_byte;
	psmouse->poll = alps_poll;
	psmouse->disconnect = alps_disconnect;
	psmouse->reconnect = alps_reconnect;
	psmouse->pktsize = priv->proto_version == ALPS_PROTO_V4 ? 8 : 6;

	/* We are having trouble resyncing ALPS touchpads so disable it for now */
	psmouse->resync_time = 0;

	return 0;

init_fail:
	psmouse_reset(psmouse);
	input_free_device(dev2);
	kfree(priv);
	psmouse->private = NULL;
	return -1;
}

int alps_detect(struct psmouse *psmouse, bool set_properties)
{
	struct alps_data dummy;

	if (alps_identify(psmouse, &dummy) < 0)
		return -1;

	if (set_properties) {
		psmouse->vendor = "ALPS";
		psmouse->name = dummy.flags & ALPS_DUALPOINT ?
				"DualPoint TouchPad" : "GlidePoint";
		psmouse->model = dummy.proto_version << 8;
	}
	return 0;
}