summaryrefslogtreecommitdiffstats
path: root/drivers/input/mouse/cyapa_gen3.c
blob: 1a9d12ae75384aca5f36e5ca171105675388e4f6 (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
/*
 * Cypress APA trackpad with I2C interface
 *
 * Author: Dudley Du <dudl@cypress.com>
 * Further cleanup and restructuring by:
 *   Daniel Kurtz <djkurtz@chromium.org>
 *   Benson Leung <bleung@chromium.org>
 *
 * Copyright (C) 2011-2015 Cypress Semiconductor, Inc.
 * Copyright (C) 2011-2012 Google, Inc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive for
 * more details.
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <asm/unaligned.h>
#include "cyapa.h"


#define GEN3_MAX_FINGERS 5
#define GEN3_FINGER_NUM(x) (((x) >> 4) & 0x07)

#define BLK_HEAD_BYTES 32

/* Macro for register map group offset. */
#define PRODUCT_ID_SIZE  16
#define QUERY_DATA_SIZE  27
#define REG_PROTOCOL_GEN_QUERY_OFFSET  20

#define REG_OFFSET_DATA_BASE     0x0000
#define REG_OFFSET_COMMAND_BASE  0x0028
#define REG_OFFSET_QUERY_BASE    0x002a

#define CYAPA_OFFSET_SOFT_RESET  REG_OFFSET_COMMAND_BASE
#define OP_RECALIBRATION_MASK    0x80
#define OP_REPORT_BASELINE_MASK  0x40
#define REG_OFFSET_MAX_BASELINE  0x0026
#define REG_OFFSET_MIN_BASELINE  0x0027

#define REG_OFFSET_POWER_MODE (REG_OFFSET_COMMAND_BASE + 1)
#define SET_POWER_MODE_DELAY   10000  /* Unit: us */
#define SET_POWER_MODE_TRIES   5

#define GEN3_BL_CMD_CHECKSUM_SEED 0xff
#define GEN3_BL_CMD_INITIATE_BL   0x38
#define GEN3_BL_CMD_WRITE_BLOCK   0x39
#define GEN3_BL_CMD_VERIFY_BLOCK  0x3a
#define GEN3_BL_CMD_TERMINATE_BL  0x3b
#define GEN3_BL_CMD_LAUNCH_APP    0xa5

/*
 * CYAPA trackpad device states.
 * Used in register 0x00, bit1-0, DeviceStatus field.
 * Other values indicate device is in an abnormal state and must be reset.
 */
#define CYAPA_DEV_NORMAL  0x03
#define CYAPA_DEV_BUSY    0x01

#define CYAPA_FW_BLOCK_SIZE	64
#define CYAPA_FW_READ_SIZE	16
#define CYAPA_FW_HDR_START	0x0780
#define CYAPA_FW_HDR_BLOCK_COUNT  2
#define CYAPA_FW_HDR_BLOCK_START  (CYAPA_FW_HDR_START / CYAPA_FW_BLOCK_SIZE)
#define CYAPA_FW_HDR_SIZE	  (CYAPA_FW_HDR_BLOCK_COUNT * \
					CYAPA_FW_BLOCK_SIZE)
#define CYAPA_FW_DATA_START	0x0800
#define CYAPA_FW_DATA_BLOCK_COUNT  480
#define CYAPA_FW_DATA_BLOCK_START  (CYAPA_FW_DATA_START / CYAPA_FW_BLOCK_SIZE)
#define CYAPA_FW_DATA_SIZE	(CYAPA_FW_DATA_BLOCK_COUNT * \
				 CYAPA_FW_BLOCK_SIZE)
#define CYAPA_FW_SIZE		(CYAPA_FW_HDR_SIZE + CYAPA_FW_DATA_SIZE)
#define CYAPA_CMD_LEN		16

#define GEN3_BL_IDLE_FW_MAJ_VER_OFFSET 0x0b
#define GEN3_BL_IDLE_FW_MIN_VER_OFFSET (GEN3_BL_IDLE_FW_MAJ_VER_OFFSET + 1)


struct cyapa_touch {
	/*
	 * high bits or x/y position value
	 * bit 7 - 4: high 4 bits of x position value
	 * bit 3 - 0: high 4 bits of y position value
	 */
	u8 xy_hi;
	u8 x_lo;  /* low 8 bits of x position value. */
	u8 y_lo;  /* low 8 bits of y position value. */
	u8 pressure;
	/* id range is 1 - 15.  It is incremented with every new touch. */
	u8 id;
} __packed;

struct cyapa_reg_data {
	/*
	 * bit 0 - 1: device status
	 * bit 3 - 2: power mode
	 * bit 6 - 4: reserved
	 * bit 7: interrupt valid bit
	 */
	u8 device_status;
	/*
	 * bit 7 - 4: number of fingers currently touching pad
	 * bit 3: valid data check bit
	 * bit 2: middle mechanism button state if exists
	 * bit 1: right mechanism button state if exists
	 * bit 0: left mechanism button state if exists
	 */
	u8 finger_btn;
	/* CYAPA reports up to 5 touches per packet. */
	struct cyapa_touch touches[5];
} __packed;

struct gen3_write_block_cmd {
	u8 checksum_seed;  /* Always be 0xff */
	u8 cmd_code;       /* command code: 0x39 */
	u8 key[8];         /* 8-byte security key */
	__be16 block_num;
	u8 block_data[CYAPA_FW_BLOCK_SIZE];
	u8 block_checksum;  /* Calculated using bytes 12 - 75 */
	u8 cmd_checksum;    /* Calculated using bytes 0-76 */
} __packed;

static const u8 security_key[] = {
		0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };
static const u8 bl_activate[] = { 0x00, 0xff, 0x38, 0x00, 0x01, 0x02, 0x03,
		0x04, 0x05, 0x06, 0x07 };
static const u8 bl_deactivate[] = { 0x00, 0xff, 0x3b, 0x00, 0x01, 0x02, 0x03,
		0x04, 0x05, 0x06, 0x07 };
static const u8 bl_exit[] = { 0x00, 0xff, 0xa5, 0x00, 0x01, 0x02, 0x03, 0x04,
		0x05, 0x06, 0x07 };


 /* for byte read/write command */
#define CMD_RESET      0
#define CMD_POWER_MODE 1
#define CMD_DEV_STATUS 2
#define CMD_REPORT_MAX_BASELINE 3
#define CMD_REPORT_MIN_BASELINE 4
#define SMBUS_BYTE_CMD(cmd) (((cmd) & 0x3f) << 1)
#define CYAPA_SMBUS_RESET         SMBUS_BYTE_CMD(CMD_RESET)
#define CYAPA_SMBUS_POWER_MODE    SMBUS_BYTE_CMD(CMD_POWER_MODE)
#define CYAPA_SMBUS_DEV_STATUS    SMBUS_BYTE_CMD(CMD_DEV_STATUS)
#define CYAPA_SMBUS_MAX_BASELINE  SMBUS_BYTE_CMD(CMD_REPORT_MAX_BASELINE)
#define CYAPA_SMBUS_MIN_BASELINE  SMBUS_BYTE_CMD(CMD_REPORT_MIN_BASELINE)

 /* for group registers read/write command */
#define REG_GROUP_DATA 0
#define REG_GROUP_CMD 2
#define REG_GROUP_QUERY 3
#define SMBUS_GROUP_CMD(grp) (0x80 | (((grp) & 0x07) << 3))
#define CYAPA_SMBUS_GROUP_DATA	 SMBUS_GROUP_CMD(REG_GROUP_DATA)
#define CYAPA_SMBUS_GROUP_CMD	 SMBUS_GROUP_CMD(REG_GROUP_CMD)
#define CYAPA_SMBUS_GROUP_QUERY	 SMBUS_GROUP_CMD(REG_GROUP_QUERY)

 /* for register block read/write command */
#define CMD_BL_STATUS 0
#define CMD_BL_HEAD 1
#define CMD_BL_CMD 2
#define CMD_BL_DATA 3
#define CMD_BL_ALL 4
#define CMD_BLK_PRODUCT_ID 5
#define CMD_BLK_HEAD 6
#define SMBUS_BLOCK_CMD(cmd) (0xc0 | (((cmd) & 0x1f) << 1))

/* register block read/write command in bootloader mode */
#define CYAPA_SMBUS_BL_STATUS  SMBUS_BLOCK_CMD(CMD_BL_STATUS)
#define CYAPA_SMBUS_BL_HEAD    SMBUS_BLOCK_CMD(CMD_BL_HEAD)
#define CYAPA_SMBUS_BL_CMD     SMBUS_BLOCK_CMD(CMD_BL_CMD)
#define CYAPA_SMBUS_BL_DATA    SMBUS_BLOCK_CMD(CMD_BL_DATA)
#define CYAPA_SMBUS_BL_ALL     SMBUS_BLOCK_CMD(CMD_BL_ALL)

/* register block read/write command in operational mode */
#define CYAPA_SMBUS_BLK_PRODUCT_ID SMBUS_BLOCK_CMD(CMD_BLK_PRODUCT_ID)
#define CYAPA_SMBUS_BLK_HEAD SMBUS_BLOCK_CMD(CMD_BLK_HEAD)

 /* for byte read/write command */
#define CMD_RESET 0
#define CMD_POWER_MODE 1
#define CMD_DEV_STATUS 2
#define CMD_REPORT_MAX_BASELINE 3
#define CMD_REPORT_MIN_BASELINE 4
#define SMBUS_BYTE_CMD(cmd) (((cmd) & 0x3f) << 1)
#define CYAPA_SMBUS_RESET         SMBUS_BYTE_CMD(CMD_RESET)
#define CYAPA_SMBUS_POWER_MODE    SMBUS_BYTE_CMD(CMD_POWER_MODE)
#define CYAPA_SMBUS_DEV_STATUS    SMBUS_BYTE_CMD(CMD_DEV_STATUS)
#define CYAPA_SMBUS_MAX_BASELINE  SMBUS_BYTE_CMD(CMD_REPORT_MAX_BASELINE)
#define CYAPA_SMBUS_MIN_BASELINE  SMBUS_BYTE_CMD(CMD_REPORT_MIN_BASELINE)

 /* for group registers read/write command */
#define REG_GROUP_DATA  0
#define REG_GROUP_CMD   2
#define REG_GROUP_QUERY 3
#define SMBUS_GROUP_CMD(grp) (0x80 | (((grp) & 0x07) << 3))
#define CYAPA_SMBUS_GROUP_DATA  SMBUS_GROUP_CMD(REG_GROUP_DATA)
#define CYAPA_SMBUS_GROUP_CMD   SMBUS_GROUP_CMD(REG_GROUP_CMD)
#define CYAPA_SMBUS_GROUP_QUERY SMBUS_GROUP_CMD(REG_GROUP_QUERY)

 /* for register block read/write command */
#define CMD_BL_STATUS		0
#define CMD_BL_HEAD		1
#define CMD_BL_CMD		2
#define CMD_BL_DATA		3
#define CMD_BL_ALL		4
#define CMD_BLK_PRODUCT_ID	5
#define CMD_BLK_HEAD		6
#define SMBUS_BLOCK_CMD(cmd) (0xc0 | (((cmd) & 0x1f) << 1))

/* register block read/write command in bootloader mode */
#define CYAPA_SMBUS_BL_STATUS SMBUS_BLOCK_CMD(CMD_BL_STATUS)
#define CYAPA_SMBUS_BL_HEAD   SMBUS_BLOCK_CMD(CMD_BL_HEAD)
#define CYAPA_SMBUS_BL_CMD    SMBUS_BLOCK_CMD(CMD_BL_CMD)
#define CYAPA_SMBUS_BL_DATA   SMBUS_BLOCK_CMD(CMD_BL_DATA)
#define CYAPA_SMBUS_BL_ALL    SMBUS_BLOCK_CMD(CMD_BL_ALL)

/* register block read/write command in operational mode */
#define CYAPA_SMBUS_BLK_PRODUCT_ID SMBUS_BLOCK_CMD(CMD_BLK_PRODUCT_ID)
#define CYAPA_SMBUS_BLK_HEAD       SMBUS_BLOCK_CMD(CMD_BLK_HEAD)

struct cyapa_cmd_len {
	u8 cmd;
	u8 len;
};

/* maps generic CYAPA_CMD_* code to the I2C equivalent */
static const struct cyapa_cmd_len cyapa_i2c_cmds[] = {
	{ CYAPA_OFFSET_SOFT_RESET, 1 },		/* CYAPA_CMD_SOFT_RESET */
	{ REG_OFFSET_COMMAND_BASE + 1, 1 },	/* CYAPA_CMD_POWER_MODE */
	{ REG_OFFSET_DATA_BASE, 1 },		/* CYAPA_CMD_DEV_STATUS */
	{ REG_OFFSET_DATA_BASE, sizeof(struct cyapa_reg_data) },
						/* CYAPA_CMD_GROUP_DATA */
	{ REG_OFFSET_COMMAND_BASE, 0 },		/* CYAPA_CMD_GROUP_CMD */
	{ REG_OFFSET_QUERY_BASE, QUERY_DATA_SIZE }, /* CYAPA_CMD_GROUP_QUERY */
	{ BL_HEAD_OFFSET, 3 },			/* CYAPA_CMD_BL_STATUS */
	{ BL_HEAD_OFFSET, 16 },			/* CYAPA_CMD_BL_HEAD */
	{ BL_HEAD_OFFSET, 16 },			/* CYAPA_CMD_BL_CMD */
	{ BL_DATA_OFFSET, 16 },			/* CYAPA_CMD_BL_DATA */
	{ BL_HEAD_OFFSET, 32 },			/* CYAPA_CMD_BL_ALL */
	{ REG_OFFSET_QUERY_BASE, PRODUCT_ID_SIZE },
						/* CYAPA_CMD_BLK_PRODUCT_ID */
	{ REG_OFFSET_DATA_BASE, 32 },		/* CYAPA_CMD_BLK_HEAD */
	{ REG_OFFSET_MAX_BASELINE, 1 },		/* CYAPA_CMD_MAX_BASELINE */
	{ REG_OFFSET_MIN_BASELINE, 1 },		/* CYAPA_CMD_MIN_BASELINE */
};

static const struct cyapa_cmd_len cyapa_smbus_cmds[] = {
	{ CYAPA_SMBUS_RESET, 1 },		/* CYAPA_CMD_SOFT_RESET */
	{ CYAPA_SMBUS_POWER_MODE, 1 },		/* CYAPA_CMD_POWER_MODE */
	{ CYAPA_SMBUS_DEV_STATUS, 1 },		/* CYAPA_CMD_DEV_STATUS */
	{ CYAPA_SMBUS_GROUP_DATA, sizeof(struct cyapa_reg_data) },
						/* CYAPA_CMD_GROUP_DATA */
	{ CYAPA_SMBUS_GROUP_CMD, 2 },		/* CYAPA_CMD_GROUP_CMD */
	{ CYAPA_SMBUS_GROUP_QUERY, QUERY_DATA_SIZE },
						/* CYAPA_CMD_GROUP_QUERY */
	{ CYAPA_SMBUS_BL_STATUS, 3 },		/* CYAPA_CMD_BL_STATUS */
	{ CYAPA_SMBUS_BL_HEAD, 16 },		/* CYAPA_CMD_BL_HEAD */
	{ CYAPA_SMBUS_BL_CMD, 16 },		/* CYAPA_CMD_BL_CMD */
	{ CYAPA_SMBUS_BL_DATA, 16 },		/* CYAPA_CMD_BL_DATA */
	{ CYAPA_SMBUS_BL_ALL, 32 },		/* CYAPA_CMD_BL_ALL */
	{ CYAPA_SMBUS_BLK_PRODUCT_ID, PRODUCT_ID_SIZE },
						/* CYAPA_CMD_BLK_PRODUCT_ID */
	{ CYAPA_SMBUS_BLK_HEAD, 16 },		/* CYAPA_CMD_BLK_HEAD */
	{ CYAPA_SMBUS_MAX_BASELINE, 1 },	/* CYAPA_CMD_MAX_BASELINE */
	{ CYAPA_SMBUS_MIN_BASELINE, 1 },	/* CYAPA_CMD_MIN_BASELINE */
};


/*
 * cyapa_smbus_read_block - perform smbus block read command
 * @cyapa  - private data structure of the driver
 * @cmd    - the properly encoded smbus command
 * @len    - expected length of smbus command result
 * @values - buffer to store smbus command result
 *
 * Returns negative errno, else the number of bytes written.
 *
 * Note:
 * In trackpad device, the memory block allocated for I2C register map
 * is 256 bytes, so the max read block for I2C bus is 256 bytes.
 */
ssize_t cyapa_smbus_read_block(struct cyapa *cyapa, u8 cmd, size_t len,
				      u8 *values)
{
	ssize_t ret;
	u8 index;
	u8 smbus_cmd;
	u8 *buf;
	struct i2c_client *client = cyapa->client;

	if (!(SMBUS_BYTE_BLOCK_CMD_MASK & cmd))
		return -EINVAL;

	if (SMBUS_GROUP_BLOCK_CMD_MASK & cmd) {
		/* read specific block registers command. */
		smbus_cmd = SMBUS_ENCODE_RW(cmd, SMBUS_READ);
		ret = i2c_smbus_read_block_data(client, smbus_cmd, values);
		goto out;
	}

	ret = 0;
	for (index = 0; index * I2C_SMBUS_BLOCK_MAX < len; index++) {
		smbus_cmd = SMBUS_ENCODE_IDX(cmd, index);
		smbus_cmd = SMBUS_ENCODE_RW(smbus_cmd, SMBUS_READ);
		buf = values + I2C_SMBUS_BLOCK_MAX * index;
		ret = i2c_smbus_read_block_data(client, smbus_cmd, buf);
		if (ret < 0)
			goto out;
	}

out:
	return ret > 0 ? len : ret;
}

static s32 cyapa_read_byte(struct cyapa *cyapa, u8 cmd_idx)
{
	u8 cmd;

	if (cyapa->smbus) {
		cmd = cyapa_smbus_cmds[cmd_idx].cmd;
		cmd = SMBUS_ENCODE_RW(cmd, SMBUS_READ);
	} else {
		cmd = cyapa_i2c_cmds[cmd_idx].cmd;
	}
	return i2c_smbus_read_byte_data(cyapa->client, cmd);
}

static s32 cyapa_write_byte(struct cyapa *cyapa, u8 cmd_idx, u8 value)
{
	u8 cmd;

	if (cyapa->smbus) {
		cmd = cyapa_smbus_cmds[cmd_idx].cmd;
		cmd = SMBUS_ENCODE_RW(cmd, SMBUS_WRITE);
	} else {
		cmd = cyapa_i2c_cmds[cmd_idx].cmd;
	}
	return i2c_smbus_write_byte_data(cyapa->client, cmd, value);
}

ssize_t cyapa_i2c_reg_read_block(struct cyapa *cyapa, u8 reg, size_t len,
					u8 *values)
{
	return i2c_smbus_read_i2c_block_data(cyapa->client, reg, len, values);
}

static ssize_t cyapa_i2c_reg_write_block(struct cyapa *cyapa, u8 reg,
					 size_t len, const u8 *values)
{
	return i2c_smbus_write_i2c_block_data(cyapa->client, reg, len, values);
}

ssize_t cyapa_read_block(struct cyapa *cyapa, u8 cmd_idx, u8 *values)
{
	u8 cmd;
	size_t len;

	if (cyapa->smbus) {
		cmd = cyapa_smbus_cmds[cmd_idx].cmd;
		len = cyapa_smbus_cmds[cmd_idx].len;
		return cyapa_smbus_read_block(cyapa, cmd, len, values);
	}
	cmd = cyapa_i2c_cmds[cmd_idx].cmd;
	len = cyapa_i2c_cmds[cmd_idx].len;
	return cyapa_i2c_reg_read_block(cyapa, cmd, len, values);
}

/*
 * Determine the Gen3 trackpad device's current operating state.
 *
 */
static int cyapa_gen3_state_parse(struct cyapa *cyapa, u8 *reg_data, int len)
{
	cyapa->state = CYAPA_STATE_NO_DEVICE;

	/* Parse based on Gen3 characteristic registers and bits */
	if (reg_data[REG_BL_FILE] == BL_FILE &&
		reg_data[REG_BL_ERROR] == BL_ERROR_NO_ERR_IDLE &&
		(reg_data[REG_BL_STATUS] ==
			(BL_STATUS_RUNNING | BL_STATUS_CSUM_VALID) ||
			reg_data[REG_BL_STATUS] == BL_STATUS_RUNNING)) {
		/*
		 * Normal state after power on or reset,
		 * REG_BL_STATUS == 0x11, firmware image checksum is valid.
		 * REG_BL_STATUS == 0x10, firmware image checksum is invalid.
		 */
		cyapa->gen = CYAPA_GEN3;
		cyapa->state = CYAPA_STATE_BL_IDLE;
	} else if (reg_data[REG_BL_FILE] == BL_FILE &&
		(reg_data[REG_BL_STATUS] & BL_STATUS_RUNNING) ==
			BL_STATUS_RUNNING) {
		cyapa->gen = CYAPA_GEN3;
		if (reg_data[REG_BL_STATUS] & BL_STATUS_BUSY) {
			cyapa->state = CYAPA_STATE_BL_BUSY;
		} else {
			if ((reg_data[REG_BL_ERROR] & BL_ERROR_BOOTLOADING) ==
					BL_ERROR_BOOTLOADING)
				cyapa->state = CYAPA_STATE_BL_ACTIVE;
			else
				cyapa->state = CYAPA_STATE_BL_IDLE;
		}
	} else if ((reg_data[REG_OP_STATUS] & OP_STATUS_SRC) &&
			(reg_data[REG_OP_DATA1] & OP_DATA_VALID)) {
		/*
		 * Normal state when running in operational mode,
		 * may also not in full power state or
		 * busying in command process.
		 */
		if (GEN3_FINGER_NUM(reg_data[REG_OP_DATA1]) <=
				GEN3_MAX_FINGERS) {
			/* Finger number data is valid. */
			cyapa->gen = CYAPA_GEN3;
			cyapa->state = CYAPA_STATE_OP;
		}
	} else if (reg_data[REG_OP_STATUS] == 0x0C &&
			reg_data[REG_OP_DATA1] == 0x08) {
		/* Op state when first two registers overwritten with 0x00 */
		cyapa->gen = CYAPA_GEN3;
		cyapa->state = CYAPA_STATE_OP;
	} else if (reg_data[REG_BL_STATUS] &
			(BL_STATUS_RUNNING | BL_STATUS_BUSY)) {
		cyapa->gen = CYAPA_GEN3;
		cyapa->state = CYAPA_STATE_BL_BUSY;
	}

	if (cyapa->gen == CYAPA_GEN3 && (cyapa->state == CYAPA_STATE_OP ||
		cyapa->state == CYAPA_STATE_BL_IDLE ||
		cyapa->state == CYAPA_STATE_BL_ACTIVE ||
		cyapa->state == CYAPA_STATE_BL_BUSY))
		return 0;

	return -EAGAIN;
}

/*
 * Enter bootloader by soft resetting the device.
 *
 * If device is already in the bootloader, the function just returns.
 * Otherwise, reset the device; after reset, device enters bootloader idle
 * state immediately.
 *
 * Returns:
 *   0        on success
 *   -EAGAIN  device was reset, but is not now in bootloader idle state
 *   < 0      if the device never responds within the timeout
 */
static int cyapa_gen3_bl_enter(struct cyapa *cyapa)
{
	int error;
	int waiting_time;

	error = cyapa_poll_state(cyapa, 500);
	if (error)
		return error;
	if (cyapa->state == CYAPA_STATE_BL_IDLE) {
		/* Already in BL_IDLE. Skipping reset. */
		return 0;
	}

	if (cyapa->state != CYAPA_STATE_OP)
		return -EAGAIN;

	cyapa->operational = false;
	cyapa->state = CYAPA_STATE_NO_DEVICE;
	error = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET, 0x01);
	if (error)
		return -EIO;

	usleep_range(25000, 50000);
	waiting_time = 2000;  /* For some shipset, max waiting time is 1~2s. */
	do {
		error = cyapa_poll_state(cyapa, 500);
		if (error) {
			if (error == -ETIMEDOUT) {
				waiting_time -= 500;
				continue;
			}
			return error;
		}

		if ((cyapa->state == CYAPA_STATE_BL_IDLE) &&
			!(cyapa->status[REG_BL_STATUS] & BL_STATUS_WATCHDOG))
			break;

		msleep(100);
		waiting_time -= 100;
	} while (waiting_time > 0);

	if ((cyapa->state != CYAPA_STATE_BL_IDLE) ||
		(cyapa->status[REG_BL_STATUS] & BL_STATUS_WATCHDOG))
		return -EAGAIN;

	return 0;
}

static int cyapa_gen3_bl_activate(struct cyapa *cyapa)
{
	int error;

	error = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_activate),
					bl_activate);
	if (error)
		return error;

	/* Wait for bootloader to activate; takes between 2 and 12 seconds */
	msleep(2000);
	error = cyapa_poll_state(cyapa, 11000);
	if (error)
		return error;
	if (cyapa->state != CYAPA_STATE_BL_ACTIVE)
		return -EAGAIN;

	return 0;
}

static int cyapa_gen3_bl_deactivate(struct cyapa *cyapa)
{
	int error;

	error = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_deactivate),
					bl_deactivate);
	if (error)
		return error;

	/* Wait for bootloader to switch to idle state; should take < 100ms */
	msleep(100);
	error = cyapa_poll_state(cyapa, 500);
	if (error)
		return error;
	if (cyapa->state != CYAPA_STATE_BL_IDLE)
		return -EAGAIN;
	return 0;
}

/*
 * Exit bootloader
 *
 * Send bl_exit command, then wait 50 - 100 ms to let device transition to
 * operational mode.  If this is the first time the device's firmware is
 * running, it can take up to 2 seconds to calibrate its sensors.  So, poll
 * the device's new state for up to 2 seconds.
 *
 * Returns:
 *   -EIO    failure while reading from device
 *   -EAGAIN device is stuck in bootloader, b/c it has invalid firmware
 *   0       device is supported and in operational mode
 */
static int cyapa_gen3_bl_exit(struct cyapa *cyapa)
{
	int error;

	error = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_exit), bl_exit);
	if (error)
		return error;

	/*
	 * Wait for bootloader to exit, and operation mode to start.
	 * Normally, this takes at least 50 ms.
	 */
	usleep_range(50000, 100000);
	/*
	 * In addition, when a device boots for the first time after being
	 * updated to new firmware, it must first calibrate its sensors, which
	 * can take up to an additional 2 seconds. If the device power is
	 * running low, this may take even longer.
	 */
	error = cyapa_poll_state(cyapa, 4000);
	if (error < 0)
		return error;
	if (cyapa->state != CYAPA_STATE_OP)
		return -EAGAIN;

	return 0;
}

static u16 cyapa_gen3_csum(const u8 *buf, size_t count)
{
	int i;
	u16 csum = 0;

	for (i = 0; i < count; i++)
		csum += buf[i];

	return csum;
}

/*
 * Verify the integrity of a CYAPA firmware image file.
 *
 * The firmware image file is 30848 bytes, composed of 482 64-byte blocks.
 *
 * The first 2 blocks are the firmware header.
 * The next 480 blocks are the firmware image.
 *
 * The first two bytes of the header hold the header checksum, computed by
 * summing the other 126 bytes of the header.
 * The last two bytes of the header hold the firmware image checksum, computed
 * by summing the 30720 bytes of the image modulo 0xffff.
 *
 * Both checksums are stored little-endian.
 */
static int cyapa_gen3_check_fw(struct cyapa *cyapa, const struct firmware *fw)
{
	struct device *dev = &cyapa->client->dev;
	u16 csum;
	u16 csum_expected;

	/* Firmware must match exact 30848 bytes = 482 64-byte blocks. */
	if (fw->size != CYAPA_FW_SIZE) {
		dev_err(dev, "invalid firmware size = %zu, expected %u.\n",
			fw->size, CYAPA_FW_SIZE);
		return -EINVAL;
	}

	/* Verify header block */
	csum_expected = (fw->data[0] << 8) | fw->data[1];
	csum = cyapa_gen3_csum(&fw->data[2], CYAPA_FW_HDR_SIZE - 2);
	if (csum != csum_expected) {
		dev_err(dev, "%s %04x, expected: %04x\n",
			"invalid firmware header checksum = ",
			csum, csum_expected);
		return -EINVAL;
	}

	/* Verify firmware image */
	csum_expected = (fw->data[CYAPA_FW_HDR_SIZE - 2] << 8) |
			 fw->data[CYAPA_FW_HDR_SIZE - 1];
	csum = cyapa_gen3_csum(&fw->data[CYAPA_FW_HDR_SIZE],
			CYAPA_FW_DATA_SIZE);
	if (csum != csum_expected) {
		dev_err(dev, "%s %04x, expected: %04x\n",
			"invalid firmware header checksum = ",
			csum, csum_expected);
		return -EINVAL;
	}
	return 0;
}

/*
 * Write a |len| byte long buffer |buf| to the device, by chopping it up into a
 * sequence of smaller |CYAPA_CMD_LEN|-length write commands.
 *
 * The data bytes for a write command are prepended with the 1-byte offset
 * of the data relative to the start of |buf|.
 */
static int cyapa_gen3_write_buffer(struct cyapa *cyapa,
		const u8 *buf, size_t len)
{
	int error;
	size_t i;
	unsigned char cmd[CYAPA_CMD_LEN + 1];
	size_t cmd_len;

	for (i = 0; i < len; i += CYAPA_CMD_LEN) {
		const u8 *payload = &buf[i];

		cmd_len = (len - i >= CYAPA_CMD_LEN) ? CYAPA_CMD_LEN : len - i;
		cmd[0] = i;
		memcpy(&cmd[1], payload, cmd_len);

		error = cyapa_i2c_reg_write_block(cyapa, 0, cmd_len + 1, cmd);
		if (error)
			return error;
	}
	return 0;
}

/*
 * A firmware block write command writes 64 bytes of data to a single flash
 * page in the device.  The 78-byte block write command has the format:
 *   <0xff> <CMD> <Key> <Start> <Data> <Data-Checksum> <CMD Checksum>
 *
 *  <0xff>  - every command starts with 0xff
 *  <CMD>   - the write command value is 0x39
 *  <Key>   - write commands include an 8-byte key: { 00 01 02 03 04 05 06 07 }
 *  <Block> - Memory Block number (address / 64) (16-bit, big-endian)
 *  <Data>  - 64 bytes of firmware image data
 *  <Data Checksum> - sum of 64 <Data> bytes, modulo 0xff
 *  <CMD Checksum> - sum of 77 bytes, from 0xff to <Data Checksum>
 *
 * Each write command is split into 5 i2c write transactions of up to 16 bytes.
 * Each transaction starts with an i2c register offset: (00, 10, 20, 30, 40).
 */
static int cyapa_gen3_write_fw_block(struct cyapa *cyapa,
		u16 block, const u8 *data)
{
	int ret;
	struct gen3_write_block_cmd write_block_cmd;
	u8 status[BL_STATUS_SIZE];
	int tries;
	u8 bl_status, bl_error;

	/* Set write command and security key bytes. */
	write_block_cmd.checksum_seed = GEN3_BL_CMD_CHECKSUM_SEED;
	write_block_cmd.cmd_code = GEN3_BL_CMD_WRITE_BLOCK;
	memcpy(write_block_cmd.key, security_key, sizeof(security_key));
	put_unaligned_be16(block, &write_block_cmd.block_num);
	memcpy(write_block_cmd.block_data, data, CYAPA_FW_BLOCK_SIZE);
	write_block_cmd.block_checksum = cyapa_gen3_csum(
			write_block_cmd.block_data, CYAPA_FW_BLOCK_SIZE);
	write_block_cmd.cmd_checksum = cyapa_gen3_csum((u8 *)&write_block_cmd,
			sizeof(write_block_cmd) - 1);

	ret = cyapa_gen3_write_buffer(cyapa, (u8 *)&write_block_cmd,
			sizeof(write_block_cmd));
	if (ret)
		return ret;

	/* Wait for write to finish */
	tries = 11;  /* Programming for one block can take about 100ms. */
	do {
		usleep_range(10000, 20000);

		/* Check block write command result status. */
		ret = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET,
					       BL_STATUS_SIZE, status);
		if (ret != BL_STATUS_SIZE)
			return (ret < 0) ? ret : -EIO;
	} while ((status[REG_BL_STATUS] & BL_STATUS_BUSY) && --tries);

	/* Ignore WATCHDOG bit and reserved bits. */
	bl_status = status[REG_BL_STATUS] & ~BL_STATUS_REV_MASK;
	bl_error = status[REG_BL_ERROR] & ~BL_ERROR_RESERVED;

	if (bl_status & BL_STATUS_BUSY)
		ret = -ETIMEDOUT;
	else if (bl_status != BL_STATUS_RUNNING ||
		bl_error != BL_ERROR_BOOTLOADING)
		ret = -EIO;
	else
		ret = 0;

	return ret;
}

static int cyapa_gen3_write_blocks(struct cyapa *cyapa,
		size_t start_block, size_t block_count,
		const u8 *image_data)
{
	int error;
	int i;

	for (i = 0; i < block_count; i++) {
		size_t block = start_block + i;
		size_t addr = i * CYAPA_FW_BLOCK_SIZE;
		const u8 *data = &image_data[addr];

		error = cyapa_gen3_write_fw_block(cyapa, block, data);
		if (error)
			return error;
	}
	return 0;
}

static int cyapa_gen3_do_fw_update(struct cyapa *cyapa,
		const struct firmware *fw)
{
	struct device *dev = &cyapa->client->dev;
	int error;

	/* First write data, starting at byte 128 of fw->data */
	error = cyapa_gen3_write_blocks(cyapa,
		CYAPA_FW_DATA_BLOCK_START, CYAPA_FW_DATA_BLOCK_COUNT,
		&fw->data[CYAPA_FW_HDR_BLOCK_COUNT * CYAPA_FW_BLOCK_SIZE]);
	if (error) {
		dev_err(dev, "FW update aborted, write image: %d\n", error);
		return error;
	}

	/* Then write checksum */
	error = cyapa_gen3_write_blocks(cyapa,
		CYAPA_FW_HDR_BLOCK_START, CYAPA_FW_HDR_BLOCK_COUNT,
		&fw->data[0]);
	if (error) {
		dev_err(dev, "FW update aborted, write checksum: %d\n", error);
		return error;
	}

	return 0;
}

static ssize_t cyapa_gen3_do_calibrate(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf, size_t count)
{
	struct cyapa *cyapa = dev_get_drvdata(dev);
	int tries;
	int ret;

	ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
	if (ret < 0) {
		dev_err(dev, "Error reading dev status: %d\n", ret);
		goto out;
	}
	if ((ret & CYAPA_DEV_NORMAL) != CYAPA_DEV_NORMAL) {
		dev_warn(dev, "Trackpad device is busy, device state: 0x%02x\n",
			 ret);
		ret = -EAGAIN;
		goto out;
	}

	ret = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET,
			       OP_RECALIBRATION_MASK);
	if (ret < 0) {
		dev_err(dev, "Failed to send calibrate command: %d\n",
			ret);
		goto out;
	}

	tries = 20;  /* max recalibration timeout 2s. */
	do {
		/*
		 * For this recalibration, the max time will not exceed 2s.
		 * The average time is approximately 500 - 700 ms, and we
		 * will check the status every 100 - 200ms.
		 */
		usleep_range(100000, 200000);

		ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
		if (ret < 0) {
			dev_err(dev, "Error reading dev status: %d\n",
				ret);
			goto out;
		}
		if ((ret & CYAPA_DEV_NORMAL) == CYAPA_DEV_NORMAL)
			break;
	} while (--tries);

	if (tries == 0) {
		dev_err(dev, "Failed to calibrate. Timeout.\n");
		ret = -ETIMEDOUT;
		goto out;
	}
	dev_dbg(dev, "Calibration successful.\n");

out:
	return ret < 0 ? ret : count;
}

static ssize_t cyapa_gen3_show_baseline(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct cyapa *cyapa = dev_get_drvdata(dev);
	int max_baseline, min_baseline;
	int tries;
	int ret;

	ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
	if (ret < 0) {
		dev_err(dev, "Error reading dev status. err = %d\n", ret);
		goto out;
	}
	if ((ret & CYAPA_DEV_NORMAL) != CYAPA_DEV_NORMAL) {
		dev_warn(dev, "Trackpad device is busy. device state = 0x%x\n",
			 ret);
		ret = -EAGAIN;
		goto out;
	}

	ret = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET,
			       OP_REPORT_BASELINE_MASK);
	if (ret < 0) {
		dev_err(dev, "Failed to send report baseline command. %d\n",
			ret);
		goto out;
	}

	tries = 3;  /* Try for 30 to 60 ms */
	do {
		usleep_range(10000, 20000);

		ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
		if (ret < 0) {
			dev_err(dev, "Error reading dev status. err = %d\n",
				ret);
			goto out;
		}
		if ((ret & CYAPA_DEV_NORMAL) == CYAPA_DEV_NORMAL)
			break;
	} while (--tries);

	if (tries == 0) {
		dev_err(dev, "Device timed out going to Normal state.\n");
		ret = -ETIMEDOUT;
		goto out;
	}

	ret = cyapa_read_byte(cyapa, CYAPA_CMD_MAX_BASELINE);
	if (ret < 0) {
		dev_err(dev, "Failed to read max baseline. err = %d\n", ret);
		goto out;
	}
	max_baseline = ret;

	ret = cyapa_read_byte(cyapa, CYAPA_CMD_MIN_BASELINE);
	if (ret < 0) {
		dev_err(dev, "Failed to read min baseline. err = %d\n", ret);
		goto out;
	}
	min_baseline = ret;

	dev_dbg(dev, "Baseline report successful. Max: %d Min: %d\n",
		max_baseline, min_baseline);
	ret = scnprintf(buf, PAGE_SIZE, "%d %d\n", max_baseline, min_baseline);

out:
	return ret;
}

/*
 * cyapa_get_wait_time_for_pwr_cmd
 *
 * Compute the amount of time we need to wait after updating the touchpad
 * power mode. The touchpad needs to consume the incoming power mode set
 * command at the current clock rate.
 */

static u16 cyapa_get_wait_time_for_pwr_cmd(u8 pwr_mode)
{
	switch (pwr_mode) {
	case PWR_MODE_FULL_ACTIVE: return 20;
	case PWR_MODE_BTN_ONLY: return 20;
	case PWR_MODE_OFF: return 20;
	default: return cyapa_pwr_cmd_to_sleep_time(pwr_mode) + 50;
	}
}

/*
 * Set device power mode
 *
 * Write to the field to configure power state. Power states include :
 *   Full : Max scans and report rate.
 *   Idle : Report rate set by user specified time.
 *   ButtonOnly : No scans for fingers. When the button is triggered,
 *     a slave interrupt is asserted to notify host to wake up.
 *   Off : Only awake for i2c commands from host. No function for button
 *     or touch sensors.
 *
 * The power_mode command should conform to the following :
 *   Full : 0x3f
 *   Idle : Configurable from 20 to 1000ms. See note below for
 *     cyapa_sleep_time_to_pwr_cmd and cyapa_pwr_cmd_to_sleep_time
 *   ButtonOnly : 0x01
 *   Off : 0x00
 *
 * Device power mode can only be set when device is in operational mode.
 */
static int cyapa_gen3_set_power_mode(struct cyapa *cyapa, u8 power_mode,
		u16 always_unused, bool is_suspend_unused)
{
	int ret;
	u8 power;
	int tries;
	u16 sleep_time;

	if (cyapa->state != CYAPA_STATE_OP)
		return 0;

	tries = SET_POWER_MODE_TRIES;
	while (tries--) {
		ret = cyapa_read_byte(cyapa, CYAPA_CMD_POWER_MODE);
		if (ret >= 0)
			break;
		usleep_range(SET_POWER_MODE_DELAY, 2 * SET_POWER_MODE_DELAY);
	}
	if (ret < 0)
		return ret;

	/*
	 * Return early if the power mode to set is the same as the current
	 * one.
	 */
	if ((ret & PWR_MODE_MASK) == power_mode)
		return 0;

	sleep_time = cyapa_get_wait_time_for_pwr_cmd(ret & PWR_MODE_MASK);
	power = ret;
	power &= ~PWR_MODE_MASK;
	power |= power_mode & PWR_MODE_MASK;
	tries = SET_POWER_MODE_TRIES;
	while (tries--) {
		ret = cyapa_write_byte(cyapa, CYAPA_CMD_POWER_MODE, power);
		if (!ret)
			break;
		usleep_range(SET_POWER_MODE_DELAY, 2 * SET_POWER_MODE_DELAY);
	}

	/*
	 * Wait for the newly set power command to go in at the previous
	 * clock speed (scanrate) used by the touchpad firmware. Not
	 * doing so before issuing the next command may result in errors
	 * depending on the command's content.
	 */
	msleep(sleep_time);
	return ret;
}

static int cyapa_gen3_set_proximity(struct cyapa *cyapa, bool enable)
{
	return -EOPNOTSUPP;
}

static int cyapa_gen3_get_query_data(struct cyapa *cyapa)
{
	u8 query_data[QUERY_DATA_SIZE];
	int ret;

	if (cyapa->state != CYAPA_STATE_OP)
		return -EBUSY;

	ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_QUERY, query_data);
	if (ret != QUERY_DATA_SIZE)
		return (ret < 0) ? ret : -EIO;

	memcpy(&cyapa->product_id[0], &query_data[0], 5);
	cyapa->product_id[5] = '-';
	memcpy(&cyapa->product_id[6], &query_data[5], 6);
	cyapa->product_id[12] = '-';
	memcpy(&cyapa->product_id[13], &query_data[11], 2);
	cyapa->product_id[15] = '\0';

	cyapa->fw_maj_ver = query_data[15];
	cyapa->fw_min_ver = query_data[16];

	cyapa->btn_capability = query_data[19] & CAPABILITY_BTN_MASK;

	cyapa->gen = query_data[20] & 0x0f;

	cyapa->max_abs_x = ((query_data[21] & 0xf0) << 4) | query_data[22];
	cyapa->max_abs_y = ((query_data[21] & 0x0f) << 8) | query_data[23];

	cyapa->physical_size_x =
		((query_data[24] & 0xf0) << 4) | query_data[25];
	cyapa->physical_size_y =
		((query_data[24] & 0x0f) << 8) | query_data[26];

	cyapa->max_z = 255;

	return 0;
}

static int cyapa_gen3_bl_query_data(struct cyapa *cyapa)
{
	u8 bl_data[CYAPA_CMD_LEN];
	int ret;

	ret = cyapa_i2c_reg_read_block(cyapa, 0, CYAPA_CMD_LEN, bl_data);
	if (ret != CYAPA_CMD_LEN)
		return (ret < 0) ? ret : -EIO;

	/*
	 * This value will be updated again when entered application mode.
	 * If TP failed to enter application mode, this fw version values
	 * can be used as a reference.
	 * This firmware version valid when fw image checksum is valid.
	 */
	if (bl_data[REG_BL_STATUS] ==
			(BL_STATUS_RUNNING | BL_STATUS_CSUM_VALID)) {
		cyapa->fw_maj_ver = bl_data[GEN3_BL_IDLE_FW_MAJ_VER_OFFSET];
		cyapa->fw_min_ver = bl_data[GEN3_BL_IDLE_FW_MIN_VER_OFFSET];
	}

	return 0;
}

/*
 * Check if device is operational.
 *
 * An operational device is responding, has exited bootloader, and has
 * firmware supported by this driver.
 *
 * Returns:
 *   -EBUSY  no device or in bootloader
 *   -EIO    failure while reading from device
 *   -EAGAIN device is still in bootloader
 *           if ->state = CYAPA_STATE_BL_IDLE, device has invalid firmware
 *   -EINVAL device is in operational mode, but not supported by this driver
 *   0       device is supported
 */
static int cyapa_gen3_do_operational_check(struct cyapa *cyapa)
{
	struct device *dev = &cyapa->client->dev;
	int error;

	switch (cyapa->state) {
	case CYAPA_STATE_BL_ACTIVE:
		error = cyapa_gen3_bl_deactivate(cyapa);
		if (error) {
			dev_err(dev, "failed to bl_deactivate: %d\n", error);
			return error;
		}

	/* Fallthrough state */
	case CYAPA_STATE_BL_IDLE:
		/* Try to get firmware version in bootloader mode. */
		cyapa_gen3_bl_query_data(cyapa);

		error = cyapa_gen3_bl_exit(cyapa);
		if (error) {
			dev_err(dev, "failed to bl_exit: %d\n", error);
			return error;
		}

	/* Fallthrough state */
	case CYAPA_STATE_OP:
		/*
		 * Reading query data before going back to the full mode
		 * may cause problems, so we set the power mode first here.
		 */
		error = cyapa_gen3_set_power_mode(cyapa,
				PWR_MODE_FULL_ACTIVE, 0, false);
		if (error)
			dev_err(dev, "%s: set full power mode failed: %d\n",
				__func__, error);
		error = cyapa_gen3_get_query_data(cyapa);
		if (error < 0)
			return error;

		/* Only support firmware protocol gen3 */
		if (cyapa->gen != CYAPA_GEN3) {
			dev_err(dev, "unsupported protocol version (%d)",
				cyapa->gen);
			return -EINVAL;
		}

		/* Only support product ID starting with CYTRA */
		if (memcmp(cyapa->product_id, product_id,
				strlen(product_id)) != 0) {
			dev_err(dev, "unsupported product ID (%s)\n",
				cyapa->product_id);
			return -EINVAL;
		}

		return 0;

	default:
		return -EIO;
	}
	return 0;
}

/*
 * Return false, do not continue process
 * Return true, continue process.
 */
static bool cyapa_gen3_irq_cmd_handler(struct cyapa *cyapa)
{
	/* Not gen3 irq command response, skip for continue. */
	if (cyapa->gen != CYAPA_GEN3)
		return true;

	if (cyapa->operational)
		return true;

	/*
	 * Driver in detecting or other interface function processing,
	 * so, stop cyapa_gen3_irq_handler to continue process to
	 * avoid unwanted to error detecting and processing.
	 *
	 * And also, avoid the periodically asserted interrupts to be processed
	 * as touch inputs when gen3 failed to launch into application mode,
	 * which will cause gen3 stays in bootloader mode.
	 */
	return false;
}

static int cyapa_gen3_irq_handler(struct cyapa *cyapa)
{
	struct input_dev *input = cyapa->input;
	struct device *dev = &cyapa->client->dev;
	struct cyapa_reg_data data;
	int num_fingers;
	int ret;
	int i;

	ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_DATA, (u8 *)&data);
	if (ret != sizeof(data)) {
		dev_err(dev, "failed to read report data, (%d)\n", ret);
		return -EINVAL;
	}

	if ((data.device_status & OP_STATUS_SRC) != OP_STATUS_SRC ||
	    (data.device_status & OP_STATUS_DEV) != CYAPA_DEV_NORMAL ||
	    (data.finger_btn & OP_DATA_VALID) != OP_DATA_VALID) {
		dev_err(dev, "invalid device state bytes, %02x %02x\n",
			data.device_status, data.finger_btn);
		return -EINVAL;
	}

	num_fingers = (data.finger_btn >> 4) & 0x0f;
	for (i = 0; i < num_fingers; i++) {
		const struct cyapa_touch *touch = &data.touches[i];
		/* Note: touch->id range is 1 to 15; slots are 0 to 14. */
		int slot = touch->id - 1;

		input_mt_slot(input, slot);
		input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
		input_report_abs(input, ABS_MT_POSITION_X,
				 ((touch->xy_hi & 0xf0) << 4) | touch->x_lo);
		input_report_abs(input, ABS_MT_POSITION_Y,
				 ((touch->xy_hi & 0x0f) << 8) | touch->y_lo);
		input_report_abs(input, ABS_MT_PRESSURE, touch->pressure);
	}

	input_mt_sync_frame(input);

	if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK)
		input_report_key(input, BTN_LEFT,
				 !!(data.finger_btn & OP_DATA_LEFT_BTN));
	if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK)
		input_report_key(input, BTN_MIDDLE,
				 !!(data.finger_btn & OP_DATA_MIDDLE_BTN));
	if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK)
		input_report_key(input, BTN_RIGHT,
				 !!(data.finger_btn & OP_DATA_RIGHT_BTN));
	input_sync(input);

	return 0;
}

static int cyapa_gen3_initialize(struct cyapa *cyapa) { return 0; }
static int cyapa_gen3_bl_initiate(struct cyapa *cyapa,
		const struct firmware *fw) { return 0; }
static int cyapa_gen3_empty_output_data(struct cyapa *cyapa,
		u8 *buf, int *len, cb_sort func) { return 0; }

const struct cyapa_dev_ops cyapa_gen3_ops = {
	.check_fw = cyapa_gen3_check_fw,
	.bl_enter = cyapa_gen3_bl_enter,
	.bl_activate = cyapa_gen3_bl_activate,
	.update_fw = cyapa_gen3_do_fw_update,
	.bl_deactivate = cyapa_gen3_bl_deactivate,
	.bl_initiate = cyapa_gen3_bl_initiate,

	.show_baseline = cyapa_gen3_show_baseline,
	.calibrate_store = cyapa_gen3_do_calibrate,

	.initialize = cyapa_gen3_initialize,

	.state_parse = cyapa_gen3_state_parse,
	.operational_check = cyapa_gen3_do_operational_check,

	.irq_handler = cyapa_gen3_irq_handler,
	.irq_cmd_handler = cyapa_gen3_irq_cmd_handler,
	.sort_empty_output_data = cyapa_gen3_empty_output_data,
	.set_power_mode = cyapa_gen3_set_power_mode,

	.set_proximity = cyapa_gen3_set_proximity,
};