summaryrefslogtreecommitdiffstats
path: root/drivers/input/mouse/synaptics.c
blob: f2cceb6493a0aea304c838043735ac3889041438 (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
/*
 * Synaptics TouchPad PS/2 mouse driver
 *
 *   2003 Dmitry Torokhov <dtor@mail.ru>
 *     Added support for pass-through port. Special thanks to Peter Berg Larsen
 *     for explaining various Synaptics quirks.
 *
 *   2003 Peter Osterlund <petero2@telia.com>
 *     Ported to 2.5 input device infrastructure.
 *
 *   Copyright (C) 2001 Stefan Gmeiner <riddlebox@freesurf.ch>
 *     start merging tpconfig and gpm code to a xfree-input module
 *     adding some changes and extensions (ex. 3rd and 4th button)
 *
 *   Copyright (c) 1997 C. Scott Ananian <cananian@alumni.priceton.edu>
 *   Copyright (c) 1998-2000 Bruce Kalk <kall@compass.com>
 *     code for the special synaptics commands (from the tpconfig-source)
 *
 * 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.
 *
 * Trademarks are the property of their respective owners.
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/dmi.h>
#include <linux/input/mt.h>
#include <linux/serio.h>
#include <linux/libps2.h>
#include <linux/slab.h>
#include "psmouse.h"
#include "synaptics.h"

/*
 * The x/y limits are taken from the Synaptics TouchPad interfacing Guide,
 * section 2.3.2, which says that they should be valid regardless of the
 * actual size of the sensor.
 * Note that newer firmware allows querying device for maximum useable
 * coordinates.
 */
#define XMIN 0
#define XMAX 6143
#define YMIN 0
#define YMAX 6143
#define XMIN_NOMINAL 1472
#define XMAX_NOMINAL 5472
#define YMIN_NOMINAL 1408
#define YMAX_NOMINAL 4448

/* Size in bits of absolute position values reported by the hardware */
#define ABS_POS_BITS 13

/*
 * These values should represent the absolute maximum value that will
 * be reported for a positive position value. Some Synaptics firmware
 * uses this value to indicate a finger near the edge of the touchpad
 * whose precise position cannot be determined.
 *
 * At least one touchpad is known to report positions in excess of this
 * value which are actually negative values truncated to the 13-bit
 * reporting range. These values have never been observed to be lower
 * than 8184 (i.e. -8), so we treat all values greater than 8176 as
 * negative and any other value as positive.
 */
#define X_MAX_POSITIVE 8176
#define Y_MAX_POSITIVE 8176

/* maximum ABS_MT_POSITION displacement (in mm) */
#define DMAX 10

/*****************************************************************************
 *	Stuff we need even when we do not want native Synaptics support
 ****************************************************************************/

/*
 * Set the synaptics touchpad mode byte by special commands
 */
static int synaptics_mode_cmd(struct psmouse *psmouse, unsigned char mode)
{
	unsigned char param[1];

	if (psmouse_sliced_command(psmouse, mode))
		return -1;
	param[0] = SYN_PS_SET_MODE2;
	if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_SETRATE))
		return -1;
	return 0;
}

int synaptics_detect(struct psmouse *psmouse, bool set_properties)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	unsigned char param[4];

	param[0] = 0;

	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
	ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);

	if (param[1] != 0x47)
		return -ENODEV;

	if (set_properties) {
		psmouse->vendor = "Synaptics";
		psmouse->name = "TouchPad";
	}

	return 0;
}

void synaptics_reset(struct psmouse *psmouse)
{
	/* reset touchpad back to relative mode, gestures enabled */
	synaptics_mode_cmd(psmouse, 0);
}

#ifdef CONFIG_MOUSE_PS2_SYNAPTICS

static bool cr48_profile_sensor;

struct min_max_quirk {
	const char * const *pnp_ids;
	int x_min, x_max, y_min, y_max;
};

static const struct min_max_quirk min_max_pnpid_table[] = {
	{
		(const char * const []){"LEN0033", NULL},
		1024, 5052, 2258, 4832
	},
	{
		(const char * const []){"LEN0035", "LEN0042", NULL},
		1232, 5710, 1156, 4696
	},
	{
		(const char * const []){"LEN0034", "LEN0036", "LEN0037",
					"LEN0039", "LEN2002", "LEN2004",
					NULL},
		1024, 5112, 2024, 4832
	},
	{
		(const char * const []){"LEN2001", NULL},
		1024, 5022, 2508, 4832
	},
	{
		(const char * const []){"LEN2006", NULL},
		1264, 5675, 1171, 4688
	},
	{ }
};

/* This list has been kindly provided by Synaptics. */
static const char * const topbuttonpad_pnp_ids[] = {
	"LEN0017",
	"LEN0018",
	"LEN0019",
	"LEN0023",
	"LEN002A",
	"LEN002B",
	"LEN002C",
	"LEN002D",
	"LEN002E",
	"LEN0033", /* Helix */
	"LEN0034", /* T431s, L440, L540, T540, W540, X1 Carbon 2nd */
	"LEN0035", /* X240 */
	"LEN0036", /* T440 */
	"LEN0037", /* X1 Carbon 2nd */
	"LEN0038",
	"LEN0039", /* T440s */
	"LEN0041",
	"LEN0042", /* Yoga */
	"LEN0045",
	"LEN0046",
	"LEN0047",
	"LEN0048",
	"LEN0049",
	"LEN2000",
	"LEN2001", /* Edge E431 */
	"LEN2002", /* Edge E531 */
	"LEN2003",
	"LEN2004", /* L440 */
	"LEN2005",
	"LEN2006",
	"LEN2007",
	"LEN2008",
	"LEN2009",
	"LEN200A",
	"LEN200B",
	NULL
};

/*****************************************************************************
 *	Synaptics communications functions
 ****************************************************************************/

/*
 * Synaptics touchpads report the y coordinate from bottom to top, which is
 * opposite from what userspace expects.
 * This function is used to invert y before reporting.
 */
static int synaptics_invert_y(int y)
{
	return YMAX_NOMINAL + YMIN_NOMINAL - y;
}

/*
 * Send a command to the synpatics touchpad by special commands
 */
static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c, unsigned char *param)
{
	if (psmouse_sliced_command(psmouse, c))
		return -1;
	if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO))
		return -1;
	return 0;
}

/*
 * Read the model-id bytes from the touchpad
 * see also SYN_MODEL_* macros
 */
static int synaptics_model_id(struct psmouse *psmouse)
{
	struct synaptics_data *priv = psmouse->private;
	unsigned char mi[3];

	if (synaptics_send_cmd(psmouse, SYN_QUE_MODEL, mi))
		return -1;
	priv->model_id = (mi[0]<<16) | (mi[1]<<8) | mi[2];
	return 0;
}

/*
 * Read the board id from the touchpad
 * The board id is encoded in the "QUERY MODES" response
 */
static int synaptics_board_id(struct psmouse *psmouse)
{
	struct synaptics_data *priv = psmouse->private;
	unsigned char bid[3];

	if (synaptics_send_cmd(psmouse, SYN_QUE_MODES, bid))
		return -1;
	priv->board_id = ((bid[0] & 0xfc) << 6) | bid[1];
	return 0;
}

/*
 * Read the firmware id from the touchpad
 */
static int synaptics_firmware_id(struct psmouse *psmouse)
{
	struct synaptics_data *priv = psmouse->private;
	unsigned char fwid[3];

	if (synaptics_send_cmd(psmouse, SYN_QUE_FIRMWARE_ID, fwid))
		return -1;
	priv->firmware_id = (fwid[0] << 16) | (fwid[1] << 8) | fwid[2];
	return 0;
}

/*
 * Read the capability-bits from the touchpad
 * see also the SYN_CAP_* macros
 */
static int synaptics_capability(struct psmouse *psmouse)
{
	struct synaptics_data *priv = psmouse->private;
	unsigned char cap[3];

	if (synaptics_send_cmd(psmouse, SYN_QUE_CAPABILITIES, cap))
		return -1;
	priv->capabilities = (cap[0] << 16) | (cap[1] << 8) | cap[2];
	priv->ext_cap = priv->ext_cap_0c = 0;

	/*
	 * Older firmwares had submodel ID fixed to 0x47
	 */
	if (SYN_ID_FULL(priv->identity) < 0x705 &&
	    SYN_CAP_SUBMODEL_ID(priv->capabilities) != 0x47) {
		return -1;
	}

	/*
	 * Unless capExtended is set the rest of the flags should be ignored
	 */
	if (!SYN_CAP_EXTENDED(priv->capabilities))
		priv->capabilities = 0;

	if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 1) {
		if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_CAPAB, cap)) {
			psmouse_warn(psmouse,
				     "device claims to have extended capabilities, but I'm not able to read them.\n");
		} else {
			priv->ext_cap = (cap[0] << 16) | (cap[1] << 8) | cap[2];

			/*
			 * if nExtBtn is greater than 8 it should be considered
			 * invalid and treated as 0
			 */
			if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) > 8)
				priv->ext_cap &= 0xff0fff;
		}
	}

	if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 4) {
		if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_CAPAB_0C, cap)) {
			psmouse_warn(psmouse,
				     "device claims to have extended capability 0x0c, but I'm not able to read it.\n");
		} else {
			priv->ext_cap_0c = (cap[0] << 16) | (cap[1] << 8) | cap[2];
		}
	}

	return 0;
}

/*
 * Identify Touchpad
 * See also the SYN_ID_* macros
 */
static int synaptics_identify(struct psmouse *psmouse)
{
	struct synaptics_data *priv = psmouse->private;
	unsigned char id[3];

	if (synaptics_send_cmd(psmouse, SYN_QUE_IDENTIFY, id))
		return -1;
	priv->identity = (id[0]<<16) | (id[1]<<8) | id[2];
	if (SYN_ID_IS_SYNAPTICS(priv->identity))
		return 0;
	return -1;
}

/*
 * Read touchpad resolution and maximum reported coordinates
 * Resolution is left zero if touchpad does not support the query
 */

static int synaptics_resolution(struct psmouse *psmouse)
{
	struct synaptics_data *priv = psmouse->private;
	unsigned char resp[3];
	int i;

	if (SYN_ID_MAJOR(priv->identity) < 4)
		return 0;

	if (synaptics_send_cmd(psmouse, SYN_QUE_RESOLUTION, resp) == 0) {
		if (resp[0] != 0 && (resp[1] & 0x80) && resp[2] != 0) {
			priv->x_res = resp[0]; /* x resolution in units/mm */
			priv->y_res = resp[2]; /* y resolution in units/mm */
		}
	}

	for (i = 0; min_max_pnpid_table[i].pnp_ids; i++) {
		if (psmouse_matches_pnp_id(psmouse,
					   min_max_pnpid_table[i].pnp_ids)) {
			priv->x_min = min_max_pnpid_table[i].x_min;
			priv->x_max = min_max_pnpid_table[i].x_max;
			priv->y_min = min_max_pnpid_table[i].y_min;
			priv->y_max = min_max_pnpid_table[i].y_max;
			return 0;
		}
	}

	if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 5 &&
	    SYN_CAP_MAX_DIMENSIONS(priv->ext_cap_0c)) {
		if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_MAX_COORDS, resp)) {
			psmouse_warn(psmouse,
				     "device claims to have max coordinates query, but I'm not able to read it.\n");
		} else {
			priv->x_max = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
			priv->y_max = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
		}
	}

	if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 7 &&
	    SYN_CAP_MIN_DIMENSIONS(priv->ext_cap_0c)) {
		if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_MIN_COORDS, resp)) {
			psmouse_warn(psmouse,
				     "device claims to have min coordinates query, but I'm not able to read it.\n");
		} else {
			priv->x_min = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
			priv->y_min = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
		}
	}

	return 0;
}

static int synaptics_query_hardware(struct psmouse *psmouse)
{
	if (synaptics_identify(psmouse))
		return -1;
	if (synaptics_model_id(psmouse))
		return -1;
	if (synaptics_firmware_id(psmouse))
		return -1;
	if (synaptics_board_id(psmouse))
		return -1;
	if (synaptics_capability(psmouse))
		return -1;
	if (synaptics_resolution(psmouse))
		return -1;

	return 0;
}

static int synaptics_set_advanced_gesture_mode(struct psmouse *psmouse)
{
	static unsigned char param = 0xc8;
	struct synaptics_data *priv = psmouse->private;

	if (!(SYN_CAP_ADV_GESTURE(priv->ext_cap_0c) ||
	      SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)))
		return 0;

	if (psmouse_sliced_command(psmouse, SYN_QUE_MODEL))
		return -1;

	if (ps2_command(&psmouse->ps2dev, &param, PSMOUSE_CMD_SETRATE))
		return -1;

	/* Advanced gesture mode also sends multi finger data */
	priv->capabilities |= BIT(1);

	return 0;
}

static int synaptics_set_mode(struct psmouse *psmouse)
{
	struct synaptics_data *priv = psmouse->private;

	priv->mode = 0;
	if (priv->absolute_mode)
		priv->mode |= SYN_BIT_ABSOLUTE_MODE;
	if (priv->disable_gesture)
		priv->mode |= SYN_BIT_DISABLE_GESTURE;
	if (psmouse->rate >= 80)
		priv->mode |= SYN_BIT_HIGH_RATE;
	if (SYN_CAP_EXTENDED(priv->capabilities))
		priv->mode |= SYN_BIT_W_MODE;

	if (synaptics_mode_cmd(psmouse, priv->mode))
		return -1;

	if (priv->absolute_mode &&
	    synaptics_set_advanced_gesture_mode(psmouse)) {
		psmouse_err(psmouse, "Advanced gesture mode init failed.\n");
		return -1;
	}

	return 0;
}

static void synaptics_set_rate(struct psmouse *psmouse, unsigned int rate)
{
	struct synaptics_data *priv = psmouse->private;

	if (rate >= 80) {
		priv->mode |= SYN_BIT_HIGH_RATE;
		psmouse->rate = 80;
	} else {
		priv->mode &= ~SYN_BIT_HIGH_RATE;
		psmouse->rate = 40;
	}

	synaptics_mode_cmd(psmouse, priv->mode);
}

/*****************************************************************************
 *	Synaptics pass-through PS/2 port support
 ****************************************************************************/
static int synaptics_pt_write(struct serio *serio, unsigned char c)
{
	struct psmouse *parent = serio_get_drvdata(serio->parent);
	char rate_param = SYN_PS_CLIENT_CMD; /* indicates that we want pass-through port */

	if (psmouse_sliced_command(parent, c))
		return -1;
	if (ps2_command(&parent->ps2dev, &rate_param, PSMOUSE_CMD_SETRATE))
		return -1;
	return 0;
}

static int synaptics_pt_start(struct serio *serio)
{
	struct psmouse *parent = serio_get_drvdata(serio->parent);
	struct synaptics_data *priv = parent->private;

	serio_pause_rx(parent->ps2dev.serio);
	priv->pt_port = serio;
	serio_continue_rx(parent->ps2dev.serio);

	return 0;
}

static void synaptics_pt_stop(struct serio *serio)
{
	struct psmouse *parent = serio_get_drvdata(serio->parent);
	struct synaptics_data *priv = parent->private;

	serio_pause_rx(parent->ps2dev.serio);
	priv->pt_port = NULL;
	serio_continue_rx(parent->ps2dev.serio);
}

static int synaptics_is_pt_packet(unsigned char *buf)
{
	return (buf[0] & 0xFC) == 0x84 && (buf[3] & 0xCC) == 0xC4;
}

static void synaptics_pass_pt_packet(struct serio *ptport, unsigned char *packet)
{
	struct psmouse *child = serio_get_drvdata(ptport);

	if (child && child->state == PSMOUSE_ACTIVATED) {
		serio_interrupt(ptport, packet[1], 0);
		serio_interrupt(ptport, packet[4], 0);
		serio_interrupt(ptport, packet[5], 0);
		if (child->pktsize == 4)
			serio_interrupt(ptport, packet[2], 0);
	} else
		serio_interrupt(ptport, packet[1], 0);
}

static void synaptics_pt_activate(struct psmouse *psmouse)
{
	struct synaptics_data *priv = psmouse->private;
	struct psmouse *child = serio_get_drvdata(priv->pt_port);

	/* adjust the touchpad to child's choice of protocol */
	if (child) {
		if (child->pktsize == 4)
			priv->mode |= SYN_BIT_FOUR_BYTE_CLIENT;
		else
			priv->mode &= ~SYN_BIT_FOUR_BYTE_CLIENT;

		if (synaptics_mode_cmd(psmouse, priv->mode))
			psmouse_warn(psmouse,
				     "failed to switch guest protocol\n");
	}
}

static void synaptics_pt_create(struct psmouse *psmouse)
{
	struct serio *serio;

	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
	if (!serio) {
		psmouse_err(psmouse,
			    "not enough memory for pass-through port\n");
		return;
	}

	serio->id.type = SERIO_PS_PSTHRU;
	strlcpy(serio->name, "Synaptics pass-through", sizeof(serio->name));
	strlcpy(serio->phys, "synaptics-pt/serio0", sizeof(serio->name));
	serio->write = synaptics_pt_write;
	serio->start = synaptics_pt_start;
	serio->stop = synaptics_pt_stop;
	serio->parent = psmouse->ps2dev.serio;

	psmouse->pt_activate = synaptics_pt_activate;

	psmouse_info(psmouse, "serio: %s port at %s\n",
		     serio->name, psmouse->phys);
	serio_register_port(serio);
}

/*****************************************************************************
 *	Functions to interpret the absolute mode packets
 ****************************************************************************/

static void synaptics_parse_agm(const unsigned char buf[],
				struct synaptics_data *priv,
				struct synaptics_hw_state *hw)
{
	struct synaptics_hw_state *agm = &priv->agm;
	int agm_packet_type;

	agm_packet_type = (buf[5] & 0x30) >> 4;
	switch (agm_packet_type) {
	case 1:
		/* Gesture packet: (x, y, z) half resolution */
		agm->w = hw->w;
		agm->x = (((buf[4] & 0x0f) << 8) | buf[1]) << 1;
		agm->y = (((buf[4] & 0xf0) << 4) | buf[2]) << 1;
		agm->z = ((buf[3] & 0x30) | (buf[5] & 0x0f)) << 1;
		break;

	case 2:
		/* AGM-CONTACT packet: we are only interested in the count */
		priv->agm_count = buf[1];
		break;

	default:
		break;
	}
}

static bool is_forcepad;

static int synaptics_parse_hw_state(const unsigned char buf[],
				    struct synaptics_data *priv,
				    struct synaptics_hw_state *hw)
{
	memset(hw, 0, sizeof(struct synaptics_hw_state));

	if (SYN_MODEL_NEWABS(priv->model_id)) {
		hw->w = (((buf[0] & 0x30) >> 2) |
			 ((buf[0] & 0x04) >> 1) |
			 ((buf[3] & 0x04) >> 2));

		if ((SYN_CAP_ADV_GESTURE(priv->ext_cap_0c) ||
			SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)) &&
		    hw->w == 2) {
			synaptics_parse_agm(buf, priv, hw);
			return 1;
		}

		hw->x = (((buf[3] & 0x10) << 8) |
			 ((buf[1] & 0x0f) << 8) |
			 buf[4]);
		hw->y = (((buf[3] & 0x20) << 7) |
			 ((buf[1] & 0xf0) << 4) |
			 buf[5]);
		hw->z = buf[2];

		hw->left  = (buf[0] & 0x01) ? 1 : 0;
		hw->right = (buf[0] & 0x02) ? 1 : 0;

		if (is_forcepad) {
			/*
			 * ForcePads, like Clickpads, use middle button
			 * bits to report primary button clicks.
			 * Unfortunately they report primary button not
			 * only when user presses on the pad above certain
			 * threshold, but also when there are more than one
			 * finger on the touchpad, which interferes with
			 * out multi-finger gestures.
			 */
			if (hw->z == 0) {
				/* No contacts */
				priv->press = priv->report_press = false;
			} else if (hw->w >= 4 && ((buf[0] ^ buf[3]) & 0x01)) {
				/*
				 * Single-finger touch with pressure above
				 * the threshold. If pressure stays long
				 * enough, we'll start reporting primary
				 * button. We rely on the device continuing
				 * sending data even if finger does not
				 * move.
				 */
				if  (!priv->press) {
					priv->press_start = jiffies;
					priv->press = true;
				} else if (time_after(jiffies,
						priv->press_start +
							msecs_to_jiffies(50))) {
					priv->report_press = true;
				}
			} else {
				priv->press = false;
			}

			hw->left = priv->report_press;

		} else if (SYN_CAP_CLICKPAD(priv->ext_cap_0c)) {
			/*
			 * Clickpad's button is transmitted as middle button,
			 * however, since it is primary button, we will report
			 * it as BTN_LEFT.
			 */
			hw->left = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;

		} else if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities)) {
			hw->middle = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
			if (hw->w == 2)
				hw->scroll = (signed char)(buf[1]);
		}

		if (SYN_CAP_FOUR_BUTTON(priv->capabilities)) {
			hw->up   = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
			hw->down = ((buf[0] ^ buf[3]) & 0x02) ? 1 : 0;
		}

		if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) &&
		    ((buf[0] ^ buf[3]) & 0x02)) {
			switch (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) & ~0x01) {
			default:
				/*
				 * if nExtBtn is greater than 8 it should be
				 * considered invalid and treated as 0
				 */
				break;
			case 8:
				hw->ext_buttons |= ((buf[5] & 0x08)) ? 0x80 : 0;
				hw->ext_buttons |= ((buf[4] & 0x08)) ? 0x40 : 0;
			case 6:
				hw->ext_buttons |= ((buf[5] & 0x04)) ? 0x20 : 0;
				hw->ext_buttons |= ((buf[4] & 0x04)) ? 0x10 : 0;
			case 4:
				hw->ext_buttons |= ((buf[5] & 0x02)) ? 0x08 : 0;
				hw->ext_buttons |= ((buf[4] & 0x02)) ? 0x04 : 0;
			case 2:
				hw->ext_buttons |= ((buf[5] & 0x01)) ? 0x02 : 0;
				hw->ext_buttons |= ((buf[4] & 0x01)) ? 0x01 : 0;
			}
		}
	} else {
		hw->x = (((buf[1] & 0x1f) << 8) | buf[2]);
		hw->y = (((buf[4] & 0x1f) << 8) | buf[5]);

		hw->z = (((buf[0] & 0x30) << 2) | (buf[3] & 0x3F));
		hw->w = (((buf[1] & 0x80) >> 4) | ((buf[0] & 0x04) >> 1));

		hw->left  = (buf[0] & 0x01) ? 1 : 0;
		hw->right = (buf[0] & 0x02) ? 1 : 0;
	}

	/*
	 * Convert wrap-around values to negative. (X|Y)_MAX_POSITIVE
	 * is used by some firmware to indicate a finger at the edge of
	 * the touchpad whose precise position cannot be determined, so
	 * convert these values to the maximum axis value.
	 */
	if (hw->x > X_MAX_POSITIVE)
		hw->x -= 1 << ABS_POS_BITS;
	else if (hw->x == X_MAX_POSITIVE)
		hw->x = XMAX;

	if (hw->y > Y_MAX_POSITIVE)
		hw->y -= 1 << ABS_POS_BITS;
	else if (hw->y == Y_MAX_POSITIVE)
		hw->y = YMAX;

	return 0;
}

static void synaptics_report_semi_mt_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, synaptics_invert_y(y));
	}
}

static void synaptics_report_semi_mt_data(struct input_dev *dev,
					  const struct synaptics_hw_state *a,
					  const struct synaptics_hw_state *b,
					  int num_fingers)
{
	if (num_fingers >= 2) {
		synaptics_report_semi_mt_slot(dev, 0, true, min(a->x, b->x),
					      min(a->y, b->y));
		synaptics_report_semi_mt_slot(dev, 1, true, max(a->x, b->x),
					      max(a->y, b->y));
	} else if (num_fingers == 1) {
		synaptics_report_semi_mt_slot(dev, 0, true, a->x, a->y);
		synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
	} else {
		synaptics_report_semi_mt_slot(dev, 0, false, 0, 0);
		synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
	}
}

static void synaptics_report_buttons(struct psmouse *psmouse,
				     const struct synaptics_hw_state *hw)
{
	struct input_dev *dev = psmouse->dev;
	struct synaptics_data *priv = psmouse->private;
	int i;

	input_report_key(dev, BTN_LEFT, hw->left);
	input_report_key(dev, BTN_RIGHT, hw->right);

	if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
		input_report_key(dev, BTN_MIDDLE, hw->middle);

	if (SYN_CAP_FOUR_BUTTON(priv->capabilities)) {
		input_report_key(dev, BTN_FORWARD, hw->up);
		input_report_key(dev, BTN_BACK, hw->down);
	}

	for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
		input_report_key(dev, BTN_0 + i, hw->ext_buttons & (1 << i));
}

static void synaptics_report_mt_data(struct psmouse *psmouse,
				     const struct synaptics_hw_state *sgm,
				     int num_fingers)
{
	struct input_dev *dev = psmouse->dev;
	struct synaptics_data *priv = psmouse->private;
	const struct synaptics_hw_state *hw[2] = { sgm, &priv->agm };
	struct input_mt_pos pos[2];
	int slot[2], nsemi, i;

	nsemi = clamp_val(num_fingers, 0, 2);

	for (i = 0; i < nsemi; i++) {
		pos[i].x = hw[i]->x;
		pos[i].y = synaptics_invert_y(hw[i]->y);
	}

	input_mt_assign_slots(dev, slot, pos, nsemi, DMAX * priv->x_res);

	for (i = 0; i < nsemi; i++) {
		input_mt_slot(dev, slot[i]);
		input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
		input_report_abs(dev, ABS_MT_POSITION_X, pos[i].x);
		input_report_abs(dev, ABS_MT_POSITION_Y, pos[i].y);
		input_report_abs(dev, ABS_MT_PRESSURE, hw[i]->z);
	}

	input_mt_drop_unused(dev);

	/* Don't use active slot count to generate BTN_TOOL events. */
	input_mt_report_pointer_emulation(dev, false);

	/* Send the number of fingers reported by touchpad itself. */
	input_mt_report_finger_count(dev, num_fingers);

	synaptics_report_buttons(psmouse, sgm);

	input_sync(dev);
}

static void synaptics_image_sensor_process(struct psmouse *psmouse,
					   struct synaptics_hw_state *sgm)
{
	struct synaptics_data *priv = psmouse->private;
	int num_fingers;

	/*
	 * Update mt_state using the new finger count and current mt_state.
	 */
	if (sgm->z == 0)
		num_fingers = 0;
	else if (sgm->w >= 4)
		num_fingers = 1;
	else if (sgm->w == 0)
		num_fingers = 2;
	else if (sgm->w == 1)
		num_fingers = priv->agm_count ? priv->agm_count : 3;
	else
		num_fingers = 4;

	/* Send resulting input events to user space */
	synaptics_report_mt_data(psmouse, sgm, num_fingers);
}

/*
 *  called for each full received packet from the touchpad
 */
static void synaptics_process_packet(struct psmouse *psmouse)
{
	struct input_dev *dev = psmouse->dev;
	struct synaptics_data *priv = psmouse->private;
	struct synaptics_hw_state hw;
	int num_fingers;
	int finger_width;

	if (synaptics_parse_hw_state(psmouse->packet, priv, &hw))
		return;

	if (SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)) {
		synaptics_image_sensor_process(psmouse, &hw);
		return;
	}

	if (hw.scroll) {
		priv->scroll += hw.scroll;

		while (priv->scroll >= 4) {
			input_report_key(dev, BTN_BACK, !hw.down);
			input_sync(dev);
			input_report_key(dev, BTN_BACK, hw.down);
			input_sync(dev);
			priv->scroll -= 4;
		}
		while (priv->scroll <= -4) {
			input_report_key(dev, BTN_FORWARD, !hw.up);
			input_sync(dev);
			input_report_key(dev, BTN_FORWARD, hw.up);
			input_sync(dev);
			priv->scroll += 4;
		}
		return;
	}

	if (hw.z > 0 && hw.x > 1) {
		num_fingers = 1;
		finger_width = 5;
		if (SYN_CAP_EXTENDED(priv->capabilities)) {
			switch (hw.w) {
			case 0 ... 1:
				if (SYN_CAP_MULTIFINGER(priv->capabilities))
					num_fingers = hw.w + 2;
				break;
			case 2:
				if (SYN_MODEL_PEN(priv->model_id))
					;   /* Nothing, treat a pen as a single finger */
				break;
			case 4 ... 15:
				if (SYN_CAP_PALMDETECT(priv->capabilities))
					finger_width = hw.w;
				break;
			}
		}
	} else {
		num_fingers = 0;
		finger_width = 0;
	}

	if (cr48_profile_sensor) {
		synaptics_report_mt_data(psmouse, &hw, num_fingers);
		return;
	}

	if (SYN_CAP_ADV_GESTURE(priv->ext_cap_0c))
		synaptics_report_semi_mt_data(dev, &hw, &priv->agm,
					      num_fingers);

	/* Post events
	 * BTN_TOUCH has to be first as mousedev relies on it when doing
	 * absolute -> relative conversion
	 */
	if (hw.z > 30) input_report_key(dev, BTN_TOUCH, 1);
	if (hw.z < 25) input_report_key(dev, BTN_TOUCH, 0);

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

	if (SYN_CAP_PALMDETECT(priv->capabilities))
		input_report_abs(dev, ABS_TOOL_WIDTH, finger_width);

	input_report_key(dev, BTN_TOOL_FINGER, num_fingers == 1);
	if (SYN_CAP_MULTIFINGER(priv->capabilities)) {
		input_report_key(dev, BTN_TOOL_DOUBLETAP, num_fingers == 2);
		input_report_key(dev, BTN_TOOL_TRIPLETAP, num_fingers == 3);
	}

	synaptics_report_buttons(psmouse, &hw);

	input_sync(dev);
}

static int synaptics_validate_byte(struct psmouse *psmouse,
				   int idx, unsigned char pkt_type)
{
	static const unsigned char newabs_mask[]	= { 0xC8, 0x00, 0x00, 0xC8, 0x00 };
	static const unsigned char newabs_rel_mask[]	= { 0xC0, 0x00, 0x00, 0xC0, 0x00 };
	static const unsigned char newabs_rslt[]	= { 0x80, 0x00, 0x00, 0xC0, 0x00 };
	static const unsigned char oldabs_mask[]	= { 0xC0, 0x60, 0x00, 0xC0, 0x60 };
	static const unsigned char oldabs_rslt[]	= { 0xC0, 0x00, 0x00, 0x80, 0x00 };
	const char *packet = psmouse->packet;

	if (idx < 0 || idx > 4)
		return 0;

	switch (pkt_type) {

	case SYN_NEWABS:
	case SYN_NEWABS_RELAXED:
		return (packet[idx] & newabs_rel_mask[idx]) == newabs_rslt[idx];

	case SYN_NEWABS_STRICT:
		return (packet[idx] & newabs_mask[idx]) == newabs_rslt[idx];

	case SYN_OLDABS:
		return (packet[idx] & oldabs_mask[idx]) == oldabs_rslt[idx];

	default:
		psmouse_err(psmouse, "unknown packet type %d\n", pkt_type);
		return 0;
	}
}

static unsigned char synaptics_detect_pkt_type(struct psmouse *psmouse)
{
	int i;

	for (i = 0; i < 5; i++)
		if (!synaptics_validate_byte(psmouse, i, SYN_NEWABS_STRICT)) {
			psmouse_info(psmouse, "using relaxed packet validation\n");
			return SYN_NEWABS_RELAXED;
		}

	return SYN_NEWABS_STRICT;
}

static psmouse_ret_t synaptics_process_byte(struct psmouse *psmouse)
{
	struct synaptics_data *priv = psmouse->private;

	if (psmouse->pktcnt >= 6) { /* Full packet received */
		if (unlikely(priv->pkt_type == SYN_NEWABS))
			priv->pkt_type = synaptics_detect_pkt_type(psmouse);

		if (SYN_CAP_PASS_THROUGH(priv->capabilities) &&
		    synaptics_is_pt_packet(psmouse->packet)) {
			if (priv->pt_port)
				synaptics_pass_pt_packet(priv->pt_port, psmouse->packet);
		} else
			synaptics_process_packet(psmouse);

		return PSMOUSE_FULL_PACKET;
	}

	return synaptics_validate_byte(psmouse, psmouse->pktcnt - 1, priv->pkt_type) ?
		PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
}

/*****************************************************************************
 *	Driver initialization/cleanup functions
 ****************************************************************************/
static void set_abs_position_params(struct input_dev *dev,
				    struct synaptics_data *priv, int x_code,
				    int y_code)
{
	int x_min = priv->x_min ?: XMIN_NOMINAL;
	int x_max = priv->x_max ?: XMAX_NOMINAL;
	int y_min = priv->y_min ?: YMIN_NOMINAL;
	int y_max = priv->y_max ?: YMAX_NOMINAL;
	int fuzz = SYN_CAP_REDUCED_FILTERING(priv->ext_cap_0c) ?
			SYN_REDUCED_FILTER_FUZZ : 0;

	input_set_abs_params(dev, x_code, x_min, x_max, fuzz, 0);
	input_set_abs_params(dev, y_code, y_min, y_max, fuzz, 0);
	input_abs_set_res(dev, x_code, priv->x_res);
	input_abs_set_res(dev, y_code, priv->y_res);
}

static void set_input_params(struct psmouse *psmouse,
			     struct synaptics_data *priv)
{
	struct input_dev *dev = psmouse->dev;
	int i;

	/* Things that apply to both modes */
	__set_bit(INPUT_PROP_POINTER, dev->propbit);
	__set_bit(EV_KEY, dev->evbit);
	__set_bit(BTN_LEFT, dev->keybit);
	__set_bit(BTN_RIGHT, dev->keybit);

	if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
		__set_bit(BTN_MIDDLE, dev->keybit);

	if (!priv->absolute_mode) {
		/* Relative mode */
		__set_bit(EV_REL, dev->evbit);
		__set_bit(REL_X, dev->relbit);
		__set_bit(REL_Y, dev->relbit);
		return;
	}

	/* Absolute mode */
	__set_bit(EV_ABS, dev->evbit);
	set_abs_position_params(dev, priv, ABS_X, ABS_Y);
	input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);

	if (cr48_profile_sensor)
		input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);

	if (SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)) {
		set_abs_position_params(dev, priv, ABS_MT_POSITION_X,
					ABS_MT_POSITION_Y);
		/* Image sensors can report per-contact pressure */
		input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
		input_mt_init_slots(dev, 2, INPUT_MT_POINTER | INPUT_MT_TRACK);

		/* Image sensors can signal 4 and 5 finger clicks */
		__set_bit(BTN_TOOL_QUADTAP, dev->keybit);
		__set_bit(BTN_TOOL_QUINTTAP, dev->keybit);
	} else if (SYN_CAP_ADV_GESTURE(priv->ext_cap_0c)) {
		set_abs_position_params(dev, priv, ABS_MT_POSITION_X,
					ABS_MT_POSITION_Y);
		/*
		 * Profile sensor in CR-48 tracks contacts reasonably well,
		 * other non-image sensors with AGM use semi-mt.
		 */
		input_mt_init_slots(dev, 2,
				    INPUT_MT_POINTER |
				    (cr48_profile_sensor ?
					INPUT_MT_TRACK : INPUT_MT_SEMI_MT));
	}

	if (SYN_CAP_PALMDETECT(priv->capabilities))
		input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0);

	__set_bit(BTN_TOUCH, dev->keybit);
	__set_bit(BTN_TOOL_FINGER, dev->keybit);

	if (SYN_CAP_MULTIFINGER(priv->capabilities)) {
		__set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
		__set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
	}

	if (SYN_CAP_FOUR_BUTTON(priv->capabilities) ||
	    SYN_CAP_MIDDLE_BUTTON(priv->capabilities)) {
		__set_bit(BTN_FORWARD, dev->keybit);
		__set_bit(BTN_BACK, dev->keybit);
	}

	for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
		__set_bit(BTN_0 + i, dev->keybit);

	__clear_bit(EV_REL, dev->evbit);
	__clear_bit(REL_X, dev->relbit);
	__clear_bit(REL_Y, dev->relbit);

	if (SYN_CAP_CLICKPAD(priv->ext_cap_0c)) {
		__set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
		if (psmouse_matches_pnp_id(psmouse, topbuttonpad_pnp_ids))
			__set_bit(INPUT_PROP_TOPBUTTONPAD, dev->propbit);
		/* Clickpads report only left button */
		__clear_bit(BTN_RIGHT, dev->keybit);
		__clear_bit(BTN_MIDDLE, dev->keybit);
	}
}

static ssize_t synaptics_show_disable_gesture(struct psmouse *psmouse,
					      void *data, char *buf)
{
	struct synaptics_data *priv = psmouse->private;

	return sprintf(buf, "%c\n", priv->disable_gesture ? '1' : '0');
}

static ssize_t synaptics_set_disable_gesture(struct psmouse *psmouse,
					     void *data, const char *buf,
					     size_t len)
{
	struct synaptics_data *priv = psmouse->private;
	unsigned int value;
	int err;

	err = kstrtouint(buf, 10, &value);
	if (err)
		return err;

	if (value > 1)
		return -EINVAL;

	if (value == priv->disable_gesture)
		return len;

	priv->disable_gesture = value;
	if (value)
		priv->mode |= SYN_BIT_DISABLE_GESTURE;
	else
		priv->mode &= ~SYN_BIT_DISABLE_GESTURE;

	if (synaptics_mode_cmd(psmouse, priv->mode))
		return -EIO;

	return len;
}

PSMOUSE_DEFINE_ATTR(disable_gesture, S_IWUSR | S_IRUGO, NULL,
		    synaptics_show_disable_gesture,
		    synaptics_set_disable_gesture);

static void synaptics_disconnect(struct psmouse *psmouse)
{
	struct synaptics_data *priv = psmouse->private;

	if (!priv->absolute_mode && SYN_ID_DISGEST_SUPPORTED(priv->identity))
		device_remove_file(&psmouse->ps2dev.serio->dev,
				   &psmouse_attr_disable_gesture.dattr);

	synaptics_reset(psmouse);
	kfree(priv);
	psmouse->private = NULL;
}

static int synaptics_reconnect(struct psmouse *psmouse)
{
	struct synaptics_data *priv = psmouse->private;
	struct synaptics_data old_priv = *priv;
	unsigned char param[2];
	int retry = 0;
	int error;

	do {
		psmouse_reset(psmouse);
		if (retry) {
			/*
			 * On some boxes, right after resuming, the touchpad
			 * needs some time to finish initializing (I assume
			 * it needs time to calibrate) and start responding
			 * to Synaptics-specific queries, so let's wait a
			 * bit.
			 */
			ssleep(1);
		}
		ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETID);
		error = synaptics_detect(psmouse, 0);
	} while (error && ++retry < 3);

	if (error)
		return -1;

	if (retry > 1)
		psmouse_dbg(psmouse, "reconnected after %d tries\n", retry);

	if (synaptics_query_hardware(psmouse)) {
		psmouse_err(psmouse, "Unable to query device.\n");
		return -1;
	}

	if (synaptics_set_mode(psmouse)) {
		psmouse_err(psmouse, "Unable to initialize device.\n");
		return -1;
	}

	if (old_priv.identity != priv->identity ||
	    old_priv.model_id != priv->model_id ||
	    old_priv.capabilities != priv->capabilities ||
	    old_priv.ext_cap != priv->ext_cap) {
		psmouse_err(psmouse,
			    "hardware appears to be different: id(%ld-%ld), model(%ld-%ld), caps(%lx-%lx), ext(%lx-%lx).\n",
			    old_priv.identity, priv->identity,
			    old_priv.model_id, priv->model_id,
			    old_priv.capabilities, priv->capabilities,
			    old_priv.ext_cap, priv->ext_cap);
		return -1;
	}

	return 0;
}

static bool impaired_toshiba_kbc;

static const struct dmi_system_id toshiba_dmi_table[] __initconst = {
#if defined(CONFIG_DMI) && defined(CONFIG_X86)
	{
		/* Toshiba Satellite */
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
		},
	},
	{
		/* Toshiba Dynabook */
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
			DMI_MATCH(DMI_PRODUCT_NAME, "dynabook"),
		},
	},
	{
		/* Toshiba Portege M300 */
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
			DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE M300"),
		},

	},
	{
		/* Toshiba Portege M300 */
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Portable PC"),
			DMI_MATCH(DMI_PRODUCT_VERSION, "Version 1.0"),
		},

	},
#endif
	{ }
};

static bool broken_olpc_ec;

static const struct dmi_system_id olpc_dmi_table[] __initconst = {
#if defined(CONFIG_DMI) && defined(CONFIG_OLPC)
	{
		/* OLPC XO-1 or XO-1.5 */
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "OLPC"),
			DMI_MATCH(DMI_PRODUCT_NAME, "XO"),
		},
	},
#endif
	{ }
};

static const struct dmi_system_id __initconst cr48_dmi_table[] = {
#if defined(CONFIG_DMI) && defined(CONFIG_X86)
	{
		/* Cr-48 Chromebook (Codename Mario) */
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "IEC"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
		},
	},
#endif
	{ }
};

static const struct dmi_system_id forcepad_dmi_table[] __initconst = {
#if defined(CONFIG_DMI) && defined(CONFIG_X86)
	{
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
			DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook Folio 1040 G1"),
		},
	},
#endif
	{ }
};

void __init synaptics_module_init(void)
{
	impaired_toshiba_kbc = dmi_check_system(toshiba_dmi_table);
	broken_olpc_ec = dmi_check_system(olpc_dmi_table);
	cr48_profile_sensor = dmi_check_system(cr48_dmi_table);

	/*
	 * Unfortunately ForcePad capability is not exported over PS/2,
	 * so we have to resort to checking DMI.
	 */
	is_forcepad = dmi_check_system(forcepad_dmi_table);
}

static int __synaptics_init(struct psmouse *psmouse, bool absolute_mode)
{
	struct synaptics_data *priv;
	int err = -1;

	/*
	 * The OLPC XO has issues with Synaptics' absolute mode; the constant
	 * packet spew overloads the EC such that key presses on the keyboard
	 * are missed.  Given that, don't even attempt to use Absolute mode.
	 * Relative mode seems to work just fine.
	 */
	if (absolute_mode && broken_olpc_ec) {
		psmouse_info(psmouse,
			     "OLPC XO detected, not enabling Synaptics protocol.\n");
		return -ENODEV;
	}

	psmouse->private = priv = kzalloc(sizeof(struct synaptics_data), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	psmouse_reset(psmouse);

	if (synaptics_query_hardware(psmouse)) {
		psmouse_err(psmouse, "Unable to query device.\n");
		goto init_fail;
	}

	priv->absolute_mode = absolute_mode;
	if (SYN_ID_DISGEST_SUPPORTED(priv->identity))
		priv->disable_gesture = true;

	if (synaptics_set_mode(psmouse)) {
		psmouse_err(psmouse, "Unable to initialize device.\n");
		goto init_fail;
	}

	priv->pkt_type = SYN_MODEL_NEWABS(priv->model_id) ? SYN_NEWABS : SYN_OLDABS;

	psmouse_info(psmouse,
		     "Touchpad model: %ld, fw: %ld.%ld, id: %#lx, caps: %#lx/%#lx/%#lx, board id: %lu, fw id: %lu\n",
		     SYN_ID_MODEL(priv->identity),
		     SYN_ID_MAJOR(priv->identity), SYN_ID_MINOR(priv->identity),
		     priv->model_id,
		     priv->capabilities, priv->ext_cap, priv->ext_cap_0c,
		     priv->board_id, priv->firmware_id);

	set_input_params(psmouse, priv);

	/*
	 * Encode touchpad model so that it can be used to set
	 * input device->id.version and be visible to userspace.
	 * Because version is __u16 we have to drop something.
	 * Hardware info bits seem to be good candidates as they
	 * are documented to be for Synaptics corp. internal use.
	 */
	psmouse->model = ((priv->model_id & 0x00ff0000) >> 8) |
			  (priv->model_id & 0x000000ff);

	if (absolute_mode) {
		psmouse->protocol_handler = synaptics_process_byte;
		psmouse->pktsize = 6;
	} else {
		/* Relative mode follows standard PS/2 mouse protocol */
		psmouse->protocol_handler = psmouse_process_byte;
		psmouse->pktsize = 3;
	}

	psmouse->set_rate = synaptics_set_rate;
	psmouse->disconnect = synaptics_disconnect;
	psmouse->reconnect = synaptics_reconnect;
	psmouse->cleanup = synaptics_reset;
	/* Synaptics can usually stay in sync without extra help */
	psmouse->resync_time = 0;

	if (SYN_CAP_PASS_THROUGH(priv->capabilities))
		synaptics_pt_create(psmouse);

	/*
	 * Toshiba's KBC seems to have trouble handling data from
	 * Synaptics at full rate.  Switch to a lower rate (roughly
	 * the same rate as a standard PS/2 mouse).
	 */
	if (psmouse->rate >= 80 && impaired_toshiba_kbc) {
		psmouse_info(psmouse,
			     "Toshiba %s detected, limiting rate to 40pps.\n",
			     dmi_get_system_info(DMI_PRODUCT_NAME));
		psmouse->rate = 40;
	}

	if (!priv->absolute_mode && SYN_ID_DISGEST_SUPPORTED(priv->identity)) {
		err = device_create_file(&psmouse->ps2dev.serio->dev,
					 &psmouse_attr_disable_gesture.dattr);
		if (err) {
			psmouse_err(psmouse,
				    "Failed to create disable_gesture attribute (%d)",
				    err);
			goto init_fail;
		}
	}

	return 0;

 init_fail:
	kfree(priv);
	return err;
}

int synaptics_init(struct psmouse *psmouse)
{
	return __synaptics_init(psmouse, true);
}

int synaptics_init_relative(struct psmouse *psmouse)
{
	return __synaptics_init(psmouse, false);
}

#else /* CONFIG_MOUSE_PS2_SYNAPTICS */

void __init synaptics_module_init(void)
{
}

int synaptics_init(struct psmouse *psmouse)
{
	return -ENOSYS;
}

#endif /* CONFIG_MOUSE_PS2_SYNAPTICS */