summaryrefslogtreecommitdiff
path: root/drivers/input/touchscreen/melfas_mip4.c
blob: d4c0a0475b198932496db16905d43ffe02d1f3fd (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
/*
 * MELFAS MIP4 Touchscreen
 *
 * Copyright (C) 2016 MELFAS Inc.
 *
 * Author : Sangwon Jee <jeesw@melfas.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 */

#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <asm/unaligned.h>

#define MIP4_DEVICE_NAME	"mip4_ts"

/*****************************************************************
 * Protocol
 * Version : MIP 4.0 Rev 4.6
 *****************************************************************/

/* Address */
#define MIP4_R0_BOOT				0x00
#define MIP4_R1_BOOT_MODE			0x01
#define MIP4_R1_BOOT_BUF_ADDR			0x10
#define MIP4_R1_BOOT_STATUS			0x20
#define MIP4_R1_BOOT_CMD			0x30
#define MIP4_R1_BOOT_TARGET_ADDR		0x40
#define MIP4_R1_BOOT_SIZE			0x44

#define MIP4_R0_INFO				0x01
#define MIP4_R1_INFO_PRODUCT_NAME		0x00
#define MIP4_R1_INFO_RESOLUTION_X		0x10
#define MIP4_R1_INFO_RESOLUTION_Y		0x12
#define MIP4_R1_INFO_NODE_NUM_X			0x14
#define MIP4_R1_INFO_NODE_NUM_Y			0x15
#define MIP4_R1_INFO_KEY_NUM			0x16
#define MIP4_R1_INFO_PRESSURE_NUM		0x17
#define MIP4_R1_INFO_LENGTH_X			0x18
#define MIP4_R1_INFO_LENGTH_Y			0x1A
#define MIP4_R1_INFO_PPM_X			0x1C
#define MIP4_R1_INFO_PPM_Y			0x1D
#define MIP4_R1_INFO_VERSION_BOOT		0x20
#define MIP4_R1_INFO_VERSION_CORE		0x22
#define MIP4_R1_INFO_VERSION_APP		0x24
#define MIP4_R1_INFO_VERSION_PARAM		0x26
#define MIP4_R1_INFO_SECT_BOOT_START		0x30
#define MIP4_R1_INFO_SECT_BOOT_END		0x31
#define MIP4_R1_INFO_SECT_CORE_START		0x32
#define MIP4_R1_INFO_SECT_CORE_END		0x33
#define MIP4_R1_INFO_SECT_APP_START		0x34
#define MIP4_R1_INFO_SECT_APP_END		0x35
#define MIP4_R1_INFO_SECT_PARAM_START		0x36
#define MIP4_R1_INFO_SECT_PARAM_END		0x37
#define MIP4_R1_INFO_BUILD_DATE			0x40
#define MIP4_R1_INFO_BUILD_TIME			0x44
#define MIP4_R1_INFO_CHECKSUM_PRECALC		0x48
#define MIP4_R1_INFO_CHECKSUM_REALTIME		0x4A
#define MIP4_R1_INFO_PROTOCOL_NAME		0x50
#define MIP4_R1_INFO_PROTOCOL_VERSION		0x58
#define MIP4_R1_INFO_IC_ID			0x70
#define MIP4_R1_INFO_IC_NAME			0x71
#define MIP4_R1_INFO_IC_VENDOR_ID		0x75
#define MIP4_R1_INFO_IC_HW_CATEGORY		0x77
#define MIP4_R1_INFO_CONTACT_THD_SCR		0x78
#define MIP4_R1_INFO_CONTACT_THD_KEY		0x7A

#define MIP4_R0_EVENT				0x02
#define MIP4_R1_EVENT_SUPPORTED_FUNC		0x00
#define MIP4_R1_EVENT_FORMAT			0x04
#define MIP4_R1_EVENT_SIZE			0x06
#define MIP4_R1_EVENT_PACKET_INFO		0x10
#define MIP4_R1_EVENT_PACKET_DATA		0x11

#define MIP4_R0_CTRL				0x06
#define MIP4_R1_CTRL_READY_STATUS		0x00
#define MIP4_R1_CTRL_EVENT_READY		0x01
#define MIP4_R1_CTRL_MODE			0x10
#define MIP4_R1_CTRL_EVENT_TRIGGER_TYPE		0x11
#define MIP4_R1_CTRL_RECALIBRATE		0x12
#define MIP4_R1_CTRL_POWER_STATE		0x13
#define MIP4_R1_CTRL_GESTURE_TYPE		0x14
#define MIP4_R1_CTRL_DISABLE_ESD_ALERT		0x18
#define MIP4_R1_CTRL_CHARGER_MODE		0x19
#define MIP4_R1_CTRL_HIGH_SENS_MODE		0x1A
#define MIP4_R1_CTRL_WINDOW_MODE		0x1B
#define MIP4_R1_CTRL_PALM_REJECTION		0x1C
#define MIP4_R1_CTRL_EDGE_CORRECTION		0x1D
#define MIP4_R1_CTRL_ENTER_GLOVE_MODE		0x1E
#define MIP4_R1_CTRL_I2C_ON_LPM			0x1F
#define MIP4_R1_CTRL_GESTURE_DEBUG		0x20
#define MIP4_R1_CTRL_PALM_EVENT			0x22
#define MIP4_R1_CTRL_PROXIMITY_SENSING		0x23

/* Value */
#define MIP4_BOOT_MODE_BOOT			0x01
#define MIP4_BOOT_MODE_APP			0x02

#define MIP4_BOOT_STATUS_BUSY			0x05
#define MIP4_BOOT_STATUS_ERROR			0x0E
#define MIP4_BOOT_STATUS_DONE			0xA0

#define MIP4_BOOT_CMD_MASS_ERASE		0x15
#define MIP4_BOOT_CMD_PROGRAM			0x54
#define MIP4_BOOT_CMD_ERASE			0x8F
#define MIP4_BOOT_CMD_WRITE			0xA5
#define MIP4_BOOT_CMD_READ			0xC2

#define MIP4_EVENT_INPUT_TYPE_KEY		0
#define MIP4_EVENT_INPUT_TYPE_SCREEN		1
#define MIP4_EVENT_INPUT_TYPE_PROXIMITY		2

#define I2C_RETRY_COUNT				3	/* 2~ */

#define MIP4_BUF_SIZE				128
#define MIP4_MAX_FINGERS			10
#define MIP4_MAX_KEYS				4

#define MIP4_TOUCH_MAJOR_MIN			0
#define MIP4_TOUCH_MAJOR_MAX			255
#define MIP4_TOUCH_MINOR_MIN			0
#define MIP4_TOUCH_MINOR_MAX			255
#define MIP4_PRESSURE_MIN			0
#define MIP4_PRESSURE_MAX			255

#define MIP4_FW_NAME			"/*(DEBLOBBED)*/"
#define MIP4_FW_UPDATE_DEBUG		0	/* 0 (default) or 1 */

struct mip4_fw_version {
	u16 boot;
	u16 core;
	u16 app;
	u16 param;
};

struct mip4_ts {
	struct i2c_client *client;
	struct input_dev *input;
	struct gpio_desc *gpio_ce;

	char phys[32];
	char product_name[16];

	unsigned int max_x;
	unsigned int max_y;
	u8 node_x;
	u8 node_y;
	u8 node_key;
	unsigned int ppm_x;
	unsigned int ppm_y;

	struct mip4_fw_version fw_version;

	unsigned int event_size;
	unsigned int event_format;

	unsigned int key_num;
	unsigned short key_code[MIP4_MAX_KEYS];

	bool wake_irq_enabled;

	u8 buf[MIP4_BUF_SIZE];
};

static int mip4_i2c_xfer(struct mip4_ts *ts,
			 char *write_buf, unsigned int write_len,
			 char *read_buf, unsigned int read_len)
{
	struct i2c_msg msg[] = {
		{
			.addr = ts->client->addr,
			.flags = 0,
			.buf = write_buf,
			.len = write_len,
		}, {
			.addr = ts->client->addr,
			.flags = I2C_M_RD,
			.buf = read_buf,
			.len = read_len,
		},
	};
	int retry = I2C_RETRY_COUNT;
	int res;
	int error;

	do {
		res = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
		if (res == ARRAY_SIZE(msg))
			return 0;

		error = res < 0 ? res : -EIO;
		dev_err(&ts->client->dev,
			"%s - i2c_transfer failed: %d (%d)\n",
			__func__, error, res);
	} while (--retry);

	return error;
}

static void mip4_parse_fw_version(const u8 *buf, struct mip4_fw_version *v)
{
	v->boot  = get_unaligned_le16(buf + 0);
	v->core  = get_unaligned_le16(buf + 2);
	v->app   = get_unaligned_le16(buf + 4);
	v->param = get_unaligned_le16(buf + 6);
}

/*
 * Read chip firmware version
 */
static int mip4_get_fw_version(struct mip4_ts *ts)
{
	u8 cmd[] = { MIP4_R0_INFO, MIP4_R1_INFO_VERSION_BOOT };
	u8 buf[sizeof(ts->fw_version)];
	int error;

	error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, sizeof(buf));
	if (error) {
		memset(&ts->fw_version, 0xff, sizeof(ts->fw_version));
		return error;
	}

	mip4_parse_fw_version(buf, &ts->fw_version);

	return 0;
}

/*
 * Fetch device characteristics
 */
static int mip4_query_device(struct mip4_ts *ts)
{
	int error;
	u8 cmd[2];
	u8 buf[14];

	/* Product name */
	cmd[0] = MIP4_R0_INFO;
	cmd[1] = MIP4_R1_INFO_PRODUCT_NAME;
	error = mip4_i2c_xfer(ts, cmd, sizeof(cmd),
			      ts->product_name, sizeof(ts->product_name));
	if (error)
		dev_warn(&ts->client->dev,
			 "Failed to retrieve product name: %d\n", error);
	else
		dev_dbg(&ts->client->dev, "product name: %.*s\n",
			(int)sizeof(ts->product_name), ts->product_name);

	/* Firmware version */
	error = mip4_get_fw_version(ts);
	if (error)
		dev_warn(&ts->client->dev,
			"Failed to retrieve FW version: %d\n", error);
	else
		dev_dbg(&ts->client->dev, "F/W Version: %04X %04X %04X %04X\n",
			 ts->fw_version.boot, ts->fw_version.core,
			 ts->fw_version.app, ts->fw_version.param);

	/* Resolution */
	cmd[0] = MIP4_R0_INFO;
	cmd[1] = MIP4_R1_INFO_RESOLUTION_X;
	error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 14);
	if (error) {
		dev_warn(&ts->client->dev,
			 "Failed to retrieve touchscreen parameters: %d\n",
			 error);
	} else {
		ts->max_x = get_unaligned_le16(&buf[0]);
		ts->max_y = get_unaligned_le16(&buf[2]);
		dev_dbg(&ts->client->dev, "max_x: %d, max_y: %d\n",
			ts->max_x, ts->max_y);

		ts->node_x = buf[4];
		ts->node_y = buf[5];
		ts->node_key = buf[6];
		dev_dbg(&ts->client->dev,
			"node_x: %d, node_y: %d, node_key: %d\n",
			ts->node_x, ts->node_y, ts->node_key);

		ts->ppm_x = buf[12];
		ts->ppm_y = buf[13];
		dev_dbg(&ts->client->dev, "ppm_x: %d, ppm_y: %d\n",
			ts->ppm_x, ts->ppm_y);

		/* Key ts */
		if (ts->node_key > 0)
			ts->key_num = ts->node_key;
	}

	/* Protocol */
	cmd[0] = MIP4_R0_EVENT;
	cmd[1] = MIP4_R1_EVENT_SUPPORTED_FUNC;
	error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 7);
	if (error) {
		dev_warn(&ts->client->dev,
			"Failed to retrieve device type: %d\n", error);
		ts->event_format = 0xff;
	} else {
		ts->event_format = get_unaligned_le16(&buf[4]);
		ts->event_size = buf[6];
		dev_dbg(&ts->client->dev, "event_format: %d, event_size: %d\n",
			ts->event_format, ts->event_size);

		if (ts->event_format == 2 || ts->event_format > 3)
			dev_warn(&ts->client->dev,
				 "Unknown event format %d\n", ts->event_format);
	}

	return 0;
}

static int mip4_power_on(struct mip4_ts *ts)
{
	if (ts->gpio_ce) {
		gpiod_set_value_cansleep(ts->gpio_ce, 1);

		/* Booting delay : 200~300ms */
		usleep_range(200 * 1000, 300 * 1000);
	}

	return 0;
}

static void mip4_power_off(struct mip4_ts *ts)
{
	if (ts->gpio_ce)
		gpiod_set_value_cansleep(ts->gpio_ce, 0);
}

/*
 * Clear touch input event status
 */
static void mip4_clear_input(struct mip4_ts *ts)
{
	int i;

	/* Screen */
	for (i = 0; i < MIP4_MAX_FINGERS; i++) {
		input_mt_slot(ts->input, i);
		input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, 0);
	}

	/* Keys */
	for (i = 0; i < ts->key_num; i++)
		input_report_key(ts->input, ts->key_code[i], 0);

	input_sync(ts->input);
}

static int mip4_enable(struct mip4_ts *ts)
{
	int error;

	error = mip4_power_on(ts);
	if (error)
		return error;

	enable_irq(ts->client->irq);

	return 0;
}

static void mip4_disable(struct mip4_ts *ts)
{
	disable_irq(ts->client->irq);

	mip4_power_off(ts);

	mip4_clear_input(ts);
}

/*****************************************************************
 * Input handling
 *****************************************************************/

static void mip4_report_keys(struct mip4_ts *ts, u8 *packet)
{
	u8 key;
	bool down;

	switch (ts->event_format) {
	case 0:
	case 1:
		key = packet[0] & 0x0F;
		down = packet[0] & 0x80;
		break;

	case 3:
	default:
		key = packet[0] & 0x0F;
		down = packet[1] & 0x01;
		break;
	}

	/* Report key event */
	if (key >= 1 && key <= ts->key_num) {
		unsigned short keycode = ts->key_code[key - 1];

		dev_dbg(&ts->client->dev,
			"Key - ID: %d, keycode: %d, state: %d\n",
			key, keycode, down);

		input_event(ts->input, EV_MSC, MSC_SCAN, keycode);
		input_report_key(ts->input, keycode, down);

	} else {
		dev_err(&ts->client->dev, "Unknown key: %d\n", key);
	}
}

static void mip4_report_touch(struct mip4_ts *ts, u8 *packet)
{
	int id;
	bool hover;
	bool palm;
	bool state;
	u16 x, y;
	u8 pressure_stage = 0;
	u8 pressure;
	u8 size;
	u8 touch_major;
	u8 touch_minor;

	switch (ts->event_format) {
	case 0:
	case 1:
		/* Touch only */
		state = packet[0] & BIT(7);
		hover = packet[0] & BIT(5);
		palm = packet[0] & BIT(4);
		id = (packet[0] & 0x0F) - 1;
		x = ((packet[1] & 0x0F) << 8) | packet[2];
		y = (((packet[1] >> 4) & 0x0F) << 8) |
			packet[3];
		pressure = packet[4];
		size = packet[5];
		if (ts->event_format == 0) {
			touch_major = packet[5];
			touch_minor = packet[5];
		} else {
			touch_major = packet[6];
			touch_minor = packet[7];
		}
		break;

	case 3:
	default:
		/* Touch + Force(Pressure) */
		id = (packet[0] & 0x0F) - 1;
		hover = packet[1] & BIT(2);
		palm = packet[1] & BIT(1);
		state = packet[1] & BIT(0);
		x = ((packet[2] & 0x0F) << 8) | packet[3];
		y = (((packet[2] >> 4) & 0x0F) << 8) |
			packet[4];
		size = packet[6];
		pressure_stage = (packet[7] & 0xF0) >> 4;
		pressure = ((packet[7] & 0x0F) << 8) |
			packet[8];
		touch_major = packet[9];
		touch_minor = packet[10];
		break;
	}

	dev_dbg(&ts->client->dev,
		"Screen - Slot: %d State: %d X: %04d Y: %04d Z: %d\n",
		id, state, x, y, pressure);

	if (unlikely(id < 0 || id >= MIP4_MAX_FINGERS)) {
		dev_err(&ts->client->dev, "Screen - invalid slot ID: %d\n", id);
	} else if (state) {
		/* Press or Move event */
		input_mt_slot(ts->input, id);
		input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true);
		input_report_abs(ts->input, ABS_MT_POSITION_X, x);
		input_report_abs(ts->input, ABS_MT_POSITION_Y, y);
		input_report_abs(ts->input, ABS_MT_PRESSURE, pressure);
		input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, touch_major);
		input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, touch_minor);
	} else {
		/* Release event */
		input_mt_slot(ts->input, id);
		input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, 0);
	}

	input_mt_sync_frame(ts->input);
}

static int mip4_handle_packet(struct mip4_ts *ts, u8 *packet)
{
	u8 type;

	switch (ts->event_format) {
	case 0:
	case 1:
		type = (packet[0] & 0x40) >> 6;
		break;

	case 3:
		type = (packet[0] & 0xF0) >> 4;
		break;

	default:
		/* Should not happen unless we have corrupted firmware */
		return -EINVAL;
	}

	dev_dbg(&ts->client->dev, "Type: %d\n", type);

	/* Report input event */
	switch (type) {
	case MIP4_EVENT_INPUT_TYPE_KEY:
		mip4_report_keys(ts, packet);
		break;

	case MIP4_EVENT_INPUT_TYPE_SCREEN:
		mip4_report_touch(ts, packet);
		break;

	default:
		dev_err(&ts->client->dev, "Unknown event type: %d\n", type);
		break;
	}

	return 0;
}

static irqreturn_t mip4_interrupt(int irq, void *dev_id)
{
	struct mip4_ts *ts = dev_id;
	struct i2c_client *client = ts->client;
	unsigned int i;
	int error;
	u8 cmd[2];
	u8 size;
	bool alert;

	/* Read packet info */
	cmd[0] = MIP4_R0_EVENT;
	cmd[1] = MIP4_R1_EVENT_PACKET_INFO;
	error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), ts->buf, 1);
	if (error) {
		dev_err(&client->dev,
			"Failed to read packet info: %d\n", error);
		goto out;
	}

	size = ts->buf[0] & 0x7F;
	alert = ts->buf[0] & BIT(7);
	dev_dbg(&client->dev, "packet size: %d, alert: %d\n", size, alert);

	/* Check size */
	if (!size) {
		dev_err(&client->dev, "Empty packet\n");
		goto out;
	}

	/* Read packet data */
	cmd[0] = MIP4_R0_EVENT;
	cmd[1] = MIP4_R1_EVENT_PACKET_DATA;
	error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), ts->buf, size);
	if (error) {
		dev_err(&client->dev,
			"Failed to read packet data: %d\n", error);
		goto out;
	}

	if (alert) {
		dev_dbg(&client->dev, "Alert: %d\n", ts->buf[0]);
	} else {
		for (i = 0; i < size; i += ts->event_size) {
			error = mip4_handle_packet(ts, &ts->buf[i]);
			if (error)
				break;
		}

		input_sync(ts->input);
	}

out:
	return IRQ_HANDLED;
}

static int mip4_input_open(struct input_dev *dev)
{
	struct mip4_ts *ts = input_get_drvdata(dev);

	return mip4_enable(ts);
}

static void mip4_input_close(struct input_dev *dev)
{
	struct mip4_ts *ts = input_get_drvdata(dev);

	mip4_disable(ts);
}

/*****************************************************************
 * Firmware update
 *****************************************************************/

/* Firmware Info */
#define MIP4_BL_PAGE_SIZE		512	/* 512 */
#define MIP4_BL_PACKET_SIZE		512	/* 512, 256, 128, 64, ... */

/*
 * Firmware binary tail info
 */

struct mip4_bin_tail {
	u8 tail_mark[4];
	u8 chip_name[4];

	__le32 bin_start_addr;
	__le32 bin_length;

	__le16 ver_boot;
	__le16 ver_core;
	__le16 ver_app;
	__le16 ver_param;

	u8 boot_start;
	u8 boot_end;
	u8 core_start;
	u8 core_end;
	u8 app_start;
	u8 app_end;
	u8 param_start;
	u8 param_end;

	u8 checksum_type;
	u8 hw_category;

	__le16 param_id;
	__le32 param_length;
	__le32 build_date;
	__le32 build_time;

	__le32 reserved1;
	__le32 reserved2;
	__le16 reserved3;
	__le16 tail_size;
	__le32 crc;
} __packed;

#define MIP4_BIN_TAIL_MARK	"MBT\001"
#define MIP4_BIN_TAIL_SIZE	(sizeof(struct mip4_bin_tail))

/*
* Bootloader - Read status
*/
static int mip4_bl_read_status(struct mip4_ts *ts)
{
	u8 cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_STATUS };
	u8 result;
	struct i2c_msg msg[] = {
		{
			.addr = ts->client->addr,
			.flags = 0,
			.buf = cmd,
			.len = sizeof(cmd),
		}, {
			.addr = ts->client->addr,
			.flags = I2C_M_RD,
			.buf = &result,
			.len = sizeof(result),
		},
	};
	int ret;
	int error;
	int retry = 1000;

	do {
		ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
		if (ret != ARRAY_SIZE(msg)) {
			error = ret < 0 ? ret : -EIO;
			dev_err(&ts->client->dev,
				"Failed to read bootloader status: %d\n",
				error);
			return error;
		}

		switch (result) {
		case MIP4_BOOT_STATUS_DONE:
			dev_dbg(&ts->client->dev, "%s - done\n", __func__);
			return 0;

		case MIP4_BOOT_STATUS_ERROR:
			dev_err(&ts->client->dev, "Bootloader failure\n");
			return -EIO;

		case MIP4_BOOT_STATUS_BUSY:
			dev_dbg(&ts->client->dev, "%s - Busy\n", __func__);
			error = -EBUSY;
			break;

		default:
			dev_err(&ts->client->dev,
				"Unexpected bootloader status: %#02x\n",
				result);
			error = -EINVAL;
			break;
		}

		usleep_range(1000, 2000);
	} while (--retry);

	return error;
}

/*
* Bootloader - Change mode
*/
static int mip4_bl_change_mode(struct mip4_ts *ts, u8 mode)
{
	u8 mode_chg_cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_MODE, mode };
	u8 mode_read_cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_MODE };
	u8 result;
	struct i2c_msg msg[] = {
		{
			.addr = ts->client->addr,
			.flags = 0,
			.buf = mode_read_cmd,
			.len = sizeof(mode_read_cmd),
		}, {
			.addr = ts->client->addr,
			.flags = I2C_M_RD,
			.buf = &result,
			.len = sizeof(result),
		},
	};
	int retry = 10;
	int ret;
	int error;

	do {
		/* Send mode change command */
		ret = i2c_master_send(ts->client,
				      mode_chg_cmd, sizeof(mode_chg_cmd));
		if (ret != sizeof(mode_chg_cmd)) {
			error = ret < 0 ? ret : -EIO;
			dev_err(&ts->client->dev,
				"Failed to send %d mode change: %d (%d)\n",
				mode, error, ret);
			return error;
		}

		dev_dbg(&ts->client->dev,
			"Sent mode change request (mode: %d)\n", mode);

		/* Wait */
		msleep(1000);

		/* Verify target mode */
		ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
		if (ret != ARRAY_SIZE(msg)) {
			error = ret < 0 ? ret : -EIO;
			dev_err(&ts->client->dev,
				"Failed to read device mode: %d\n", error);
			return error;
		}

		dev_dbg(&ts->client->dev,
			"Current device mode: %d, want: %d\n", result, mode);

		if (result == mode)
			return 0;

	} while (--retry);

	return -EIO;
}

/*
 * Bootloader - Start bootloader mode
 */
static int mip4_bl_enter(struct mip4_ts *ts)
{
	return mip4_bl_change_mode(ts, MIP4_BOOT_MODE_BOOT);
}

/*
 * Bootloader - Exit bootloader mode
 */
static int mip4_bl_exit(struct mip4_ts *ts)
{
	return mip4_bl_change_mode(ts, MIP4_BOOT_MODE_APP);
}

static int mip4_bl_get_address(struct mip4_ts *ts, u16 *buf_addr)
{
	u8 cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_BUF_ADDR };
	u8 result[sizeof(u16)];
	struct i2c_msg msg[] = {
		{
			.addr = ts->client->addr,
			.flags = 0,
			.buf = cmd,
			.len = sizeof(cmd),
		}, {
			.addr = ts->client->addr,
			.flags = I2C_M_RD,
			.buf = result,
			.len = sizeof(result),
		},
	};
	int ret;
	int error;

	ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
	if (ret != ARRAY_SIZE(msg)) {
		error = ret < 0 ? ret : -EIO;
		dev_err(&ts->client->dev,
			"Failed to retrieve bootloader buffer address: %d\n",
			error);
		return error;
	}

	*buf_addr = get_unaligned_le16(result);
	dev_dbg(&ts->client->dev,
		"Bootloader buffer address %#04x\n", *buf_addr);

	return 0;
}

static int mip4_bl_program_page(struct mip4_ts *ts, int offset,
				const u8 *data, int length, u16 buf_addr)
{
	u8 cmd[6];
	u8 *data_buf;
	u16 buf_offset;
	int ret;
	int error;

	dev_dbg(&ts->client->dev, "Writing page @%#06x (%d)\n",
		offset, length);

	if (length > MIP4_BL_PAGE_SIZE || length % MIP4_BL_PACKET_SIZE) {
		dev_err(&ts->client->dev,
			"Invalid page length: %d\n", length);
		return -EINVAL;
	}

	data_buf = kmalloc(2 + MIP4_BL_PACKET_SIZE, GFP_KERNEL);
	if (!data_buf)
		return -ENOMEM;

	/* Addr */
	cmd[0] = MIP4_R0_BOOT;
	cmd[1] = MIP4_R1_BOOT_TARGET_ADDR;
	put_unaligned_le32(offset, &cmd[2]);
	ret = i2c_master_send(ts->client, cmd, 6);
	if (ret != 6) {
		error = ret < 0 ? ret : -EIO;
		dev_err(&ts->client->dev,
			"Failed to send write page address: %d\n", error);
		goto out;
	}

	/* Size */
	cmd[0] = MIP4_R0_BOOT;
	cmd[1] = MIP4_R1_BOOT_SIZE;
	put_unaligned_le32(length, &cmd[2]);
	ret = i2c_master_send(ts->client, cmd, 6);
	if (ret != 6) {
		error = ret < 0 ? ret : -EIO;
		dev_err(&ts->client->dev,
			"Failed to send write page size: %d\n", error);
		goto out;
	}

	/* Data */
	for (buf_offset = 0;
	     buf_offset < length;
	     buf_offset += MIP4_BL_PACKET_SIZE) {
		dev_dbg(&ts->client->dev,
			"writing chunk at %#04x (size %d)\n",
			buf_offset, MIP4_BL_PACKET_SIZE);
		put_unaligned_be16(buf_addr + buf_offset, data_buf);
		memcpy(&data_buf[2], &data[buf_offset], MIP4_BL_PACKET_SIZE);
		ret = i2c_master_send(ts->client,
				      data_buf, 2 + MIP4_BL_PACKET_SIZE);
		if (ret != 2 + MIP4_BL_PACKET_SIZE) {
			error = ret < 0 ? ret : -EIO;
			dev_err(&ts->client->dev,
				"Failed to read chunk at %#04x (size %d): %d\n",
				buf_offset, MIP4_BL_PACKET_SIZE, error);
			goto out;
		}
	}

	/* Command */
	cmd[0] = MIP4_R0_BOOT;
	cmd[1] = MIP4_R1_BOOT_CMD;
	cmd[2] = MIP4_BOOT_CMD_PROGRAM;
	ret = i2c_master_send(ts->client, cmd, 3);
	if (ret != 3) {
		error = ret < 0 ? ret : -EIO;
		dev_err(&ts->client->dev,
			"Failed to send 'write' command: %d\n", error);
		goto out;
	}

	/* Status */
	error = mip4_bl_read_status(ts);

out:
	kfree(data_buf);
	return error ? error : 0;
}

static int mip4_bl_verify_page(struct mip4_ts *ts, int offset,
			       const u8 *data, int length, int buf_addr)
{
	u8 cmd[8];
	u8 *read_buf;
	int buf_offset;
	struct i2c_msg msg[] = {
		{
			.addr = ts->client->addr,
			.flags = 0,
			.buf = cmd,
			.len = 2,
		}, {
			.addr = ts->client->addr,
			.flags = I2C_M_RD,
			.len = MIP4_BL_PACKET_SIZE,
		},
	};
	int ret;
	int error;

	dev_dbg(&ts->client->dev, "Validating page @%#06x (%d)\n",
		offset, length);

	/* Addr */
	cmd[0] = MIP4_R0_BOOT;
	cmd[1] = MIP4_R1_BOOT_TARGET_ADDR;
	put_unaligned_le32(offset, &cmd[2]);
	ret = i2c_master_send(ts->client, cmd, 6);
	if (ret != 6) {
		error = ret < 0 ? ret : -EIO;
		dev_err(&ts->client->dev,
			"Failed to send read page address: %d\n", error);
		return error;
	}

	/* Size */
	cmd[0] = MIP4_R0_BOOT;
	cmd[1] = MIP4_R1_BOOT_SIZE;
	put_unaligned_le32(length, &cmd[2]);
	ret = i2c_master_send(ts->client, cmd, 6);
	if (ret != 6) {
		error = ret < 0 ? ret : -EIO;
		dev_err(&ts->client->dev,
			"Failed to send read page size: %d\n", error);
		return error;
	}

	/* Command */
	cmd[0] = MIP4_R0_BOOT;
	cmd[1] = MIP4_R1_BOOT_CMD;
	cmd[2] = MIP4_BOOT_CMD_READ;
	ret = i2c_master_send(ts->client, cmd, 3);
	if (ret != 3) {
		error = ret < 0 ? ret : -EIO;
		dev_err(&ts->client->dev,
			"Failed to send 'read' command: %d\n", error);
		return error;
	}

	/* Status */
	error = mip4_bl_read_status(ts);
	if (error)
		return error;

	/* Read */
	msg[1].buf = read_buf = kmalloc(MIP4_BL_PACKET_SIZE, GFP_KERNEL);
	if (!read_buf)
		return -ENOMEM;

	for (buf_offset = 0;
	     buf_offset < length;
	     buf_offset += MIP4_BL_PACKET_SIZE) {
		dev_dbg(&ts->client->dev,
			"reading chunk at %#04x (size %d)\n",
			buf_offset, MIP4_BL_PACKET_SIZE);
		put_unaligned_be16(buf_addr + buf_offset, cmd);
		ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
		if (ret != ARRAY_SIZE(msg)) {
			error = ret < 0 ? ret : -EIO;
			dev_err(&ts->client->dev,
				"Failed to read chunk at %#04x (size %d): %d\n",
				buf_offset, MIP4_BL_PACKET_SIZE, error);
			break;
		}

		if (memcmp(&data[buf_offset], read_buf, MIP4_BL_PACKET_SIZE)) {
			dev_err(&ts->client->dev,
				"Failed to validate chunk at %#04x (size %d)\n",
				buf_offset, MIP4_BL_PACKET_SIZE);
#if MIP4_FW_UPDATE_DEBUG
			print_hex_dump(KERN_DEBUG,
				       MIP4_DEVICE_NAME " F/W File: ",
				       DUMP_PREFIX_OFFSET, 16, 1,
				       data + offset, MIP4_BL_PACKET_SIZE,
				       false);
			print_hex_dump(KERN_DEBUG,
				       MIP4_DEVICE_NAME " F/W Chip: ",
				       DUMP_PREFIX_OFFSET, 16, 1,
				       read_buf, MIP4_BL_PAGE_SIZE, false);
#endif
			error = -EINVAL;
			break;
		}
	}

	kfree(read_buf);
	return error ? error : 0;
}

/*
 * Flash chip firmware
 */
static int mip4_flash_fw(struct mip4_ts *ts,
			 const u8 *fw_data, u32 fw_size, u32 fw_offset)
{
	struct i2c_client *client = ts->client;
	int offset;
	u16 buf_addr;
	int error, error2;

	/* Enter bootloader mode */
	dev_dbg(&client->dev, "Entering bootloader mode\n");

	error = mip4_bl_enter(ts);
	if (error) {
		dev_err(&client->dev,
			"Failed to enter bootloader mode: %d\n",
			error);
		return error;
	}

	/* Read info */
	error = mip4_bl_get_address(ts, &buf_addr);
	if (error)
		goto exit_bl;

	/* Program & Verify */
	dev_dbg(&client->dev,
		"Program & Verify, page size: %d, packet size: %d\n",
		MIP4_BL_PAGE_SIZE, MIP4_BL_PACKET_SIZE);

	for (offset = fw_offset;
	     offset < fw_offset + fw_size;
	     offset += MIP4_BL_PAGE_SIZE) {
		/* Program */
		error = mip4_bl_program_page(ts, offset, fw_data + offset,
					     MIP4_BL_PAGE_SIZE, buf_addr);
		if (error)
			break;

		/* Verify */
		error = mip4_bl_verify_page(ts, offset, fw_data + offset,
					    MIP4_BL_PAGE_SIZE, buf_addr);
		if (error)
			break;
	}

exit_bl:
	/* Exit bootloader mode */
	dev_dbg(&client->dev, "Exiting bootloader mode\n");

	error2 = mip4_bl_exit(ts);
	if (error2) {
		dev_err(&client->dev,
			"Failed to exit bootloader mode: %d\n", error2);
		if (!error)
			error = error2;
	}

	/* Reset chip */
	mip4_power_off(ts);
	mip4_power_on(ts);

	mip4_query_device(ts);

	/* Refresh device parameters */
	input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->max_x, 0, 0);
	input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0);
	input_set_abs_params(ts->input, ABS_X, 0, ts->max_x, 0, 0);
	input_set_abs_params(ts->input, ABS_Y, 0, ts->max_y, 0, 0);
	input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->ppm_x);
	input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->ppm_y);
	input_abs_set_res(ts->input, ABS_X, ts->ppm_x);
	input_abs_set_res(ts->input, ABS_Y, ts->ppm_y);

	return error ? error : 0;
}

static int mip4_parse_firmware(struct mip4_ts *ts, const struct firmware *fw,
			       u32 *fw_offset_start, u32 *fw_size,
			       const struct mip4_bin_tail **pfw_info)
{
	const struct mip4_bin_tail *fw_info;
	struct mip4_fw_version fw_version;
	u16 tail_size;

	if (fw->size < MIP4_BIN_TAIL_SIZE) {
		dev_err(&ts->client->dev,
			"Invalid firmware, size mismatch (tail %zd vs %zd)\n",
			MIP4_BIN_TAIL_SIZE, fw->size);
		return -EINVAL;
	}

	fw_info = (const void *)&fw->data[fw->size - MIP4_BIN_TAIL_SIZE];

#if MIP4_FW_UPDATE_DEBUG
	print_hex_dump(KERN_ERR, MIP4_DEVICE_NAME " Bin Info: ",
		       DUMP_PREFIX_OFFSET, 16, 1, *fw_info, tail_size, false);
#endif

	tail_size = get_unaligned_le16(&fw_info->tail_size);
	if (tail_size != MIP4_BIN_TAIL_SIZE) {
		dev_err(&ts->client->dev,
			"wrong tail size: %d (expected %zd)\n",
			tail_size, MIP4_BIN_TAIL_SIZE);
		return -EINVAL;
	}

	/* Check bin format */
	if (memcmp(fw_info->tail_mark, MIP4_BIN_TAIL_MARK,
		   sizeof(fw_info->tail_mark))) {
		dev_err(&ts->client->dev,
			"unable to locate tail marker (%*ph vs %*ph)\n",
			(int)sizeof(fw_info->tail_mark), fw_info->tail_mark,
			(int)sizeof(fw_info->tail_mark), MIP4_BIN_TAIL_MARK);
		return -EINVAL;
	}

	*fw_offset_start = get_unaligned_le32(&fw_info->bin_start_addr);
	*fw_size = get_unaligned_le32(&fw_info->bin_length);

	dev_dbg(&ts->client->dev,
		"F/W Data offset: %#08x, size: %d\n",
		*fw_offset_start, *fw_size);

	if (*fw_size % MIP4_BL_PAGE_SIZE) {
		dev_err(&ts->client->dev,
			"encoded fw length %d is not multiple of pages (%d)\n",
			*fw_size, MIP4_BL_PAGE_SIZE);
		return -EINVAL;
	}

	if (fw->size != *fw_offset_start + *fw_size) {
		dev_err(&ts->client->dev,
			"Wrong firmware size, expected %d bytes, got %zd\n",
			*fw_offset_start + *fw_size, fw->size);
		return -EINVAL;
	}

	mip4_parse_fw_version((const u8 *)&fw_info->ver_boot, &fw_version);

	dev_dbg(&ts->client->dev,
		"F/W file version %04X %04X %04X %04X\n",
		fw_version.boot, fw_version.core,
		fw_version.app, fw_version.param);

	dev_dbg(&ts->client->dev, "F/W chip version: %04X %04X %04X %04X\n",
		 ts->fw_version.boot, ts->fw_version.core,
		 ts->fw_version.app, ts->fw_version.param);

	/* Check F/W type */
	if (fw_version.boot != 0xEEEE && fw_version.boot != 0xFFFF &&
	    fw_version.core == 0xEEEE &&
	    fw_version.app == 0xEEEE &&
	    fw_version.param == 0xEEEE) {
		dev_dbg(&ts->client->dev, "F/W type: Bootloader\n");
	} else if (fw_version.boot == 0xEEEE &&
		   fw_version.core != 0xEEEE && fw_version.core != 0xFFFF &&
		   fw_version.app != 0xEEEE && fw_version.app != 0xFFFF &&
		   fw_version.param != 0xEEEE && fw_version.param != 0xFFFF) {
		dev_dbg(&ts->client->dev, "F/W type: Main\n");
	} else {
		dev_err(&ts->client->dev, "Wrong firmware type\n");
		return -EINVAL;
	}

	return 0;
}

static int mip4_execute_fw_update(struct mip4_ts *ts, const struct firmware *fw)
{
	const struct mip4_bin_tail *fw_info;
	u32 fw_start_offset;
	u32 fw_size;
	int retires = 3;
	int error;

	error = mip4_parse_firmware(ts, fw,
				    &fw_start_offset, &fw_size, &fw_info);
	if (error)
		return error;

	if (ts->input->users) {
		disable_irq(ts->client->irq);
	} else {
		error = mip4_power_on(ts);
		if (error)
			return error;
	}

	/* Update firmware */
	do {
		error = mip4_flash_fw(ts, fw->data, fw_size, fw_start_offset);
		if (!error)
			break;
	} while (--retires);

	if (error)
		dev_err(&ts->client->dev,
			"Failed to flash firmware: %d\n", error);

	/* Enable IRQ */
	if (ts->input->users)
		enable_irq(ts->client->irq);
	else
		mip4_power_off(ts);

	return error ? error : 0;
}

static ssize_t mip4_sysfs_fw_update(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct mip4_ts *ts = i2c_get_clientdata(client);
	const struct firmware *fw;
	int error;

	error = reject_firmware(&fw, MIP4_FW_NAME, dev);
	if (error) {
		dev_err(&ts->client->dev,
			"Failed to retrieve firmware %s: %d\n",
			MIP4_FW_NAME, error);
		return error;
	}

	/*
	 * Take input mutex to prevent racing with itself and also with
	 * userspace opening and closing the device and also suspend/resume
	 * transitions.
	 */
	mutex_lock(&ts->input->mutex);

	error = mip4_execute_fw_update(ts, fw);

	mutex_unlock(&ts->input->mutex);

	release_firmware(fw);

	if (error) {
		dev_err(&ts->client->dev,
			"Firmware update failed: %d\n", error);
		return error;
	}

	return count;
}

static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mip4_sysfs_fw_update);

static ssize_t mip4_sysfs_read_fw_version(struct device *dev,
					  struct device_attribute *attr,
					  char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct mip4_ts *ts = i2c_get_clientdata(client);
	size_t count;

	/* Take lock to prevent racing with firmware update */
	mutex_lock(&ts->input->mutex);

	count = snprintf(buf, PAGE_SIZE, "%04X %04X %04X %04X\n",
			 ts->fw_version.boot, ts->fw_version.core,
			 ts->fw_version.app, ts->fw_version.param);

	mutex_unlock(&ts->input->mutex);

	return count;
}

static DEVICE_ATTR(fw_version, S_IRUGO, mip4_sysfs_read_fw_version, NULL);

static ssize_t mip4_sysfs_read_hw_version(struct device *dev,
					  struct device_attribute *attr,
					  char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct mip4_ts *ts = i2c_get_clientdata(client);
	size_t count;

	/* Take lock to prevent racing with firmware update */
	mutex_lock(&ts->input->mutex);

	/*
	 * product_name shows the name or version of the hardware
	 * paired with current firmware in the chip.
	 */
	count = snprintf(buf, PAGE_SIZE, "%.*s\n",
		(int)sizeof(ts->product_name), ts->product_name);

	mutex_unlock(&ts->input->mutex);

	return count;
}

static DEVICE_ATTR(hw_version, S_IRUGO, mip4_sysfs_read_hw_version, NULL);

static struct attribute *mip4_attrs[] = {
	&dev_attr_fw_version.attr,
	&dev_attr_hw_version.attr,
	&dev_attr_update_fw.attr,
	NULL,
};

static const struct attribute_group mip4_attr_group = {
	.attrs = mip4_attrs,
};

static void mip4_sysfs_remove(void *_data)
{
	struct mip4_ts *ts = _data;

	sysfs_remove_group(&ts->client->dev.kobj, &mip4_attr_group);
}

static int mip4_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
	struct mip4_ts *ts;
	struct input_dev *input;
	int error;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		dev_err(&client->dev, "Not supported I2C adapter\n");
		return -ENXIO;
	}

	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
	if (!ts)
		return -ENOMEM;

	input = devm_input_allocate_device(&client->dev);
	if (!input)
		return -ENOMEM;

	ts->client = client;
	ts->input = input;

	snprintf(ts->phys, sizeof(ts->phys),
		 "%s/input0", dev_name(&client->dev));

	ts->gpio_ce = devm_gpiod_get_optional(&client->dev,
					      "ce", GPIOD_OUT_LOW);
	if (IS_ERR(ts->gpio_ce)) {
		error = PTR_ERR(ts->gpio_ce);
		if (error != EPROBE_DEFER)
			dev_err(&client->dev,
				"Failed to get gpio: %d\n", error);
		return error;
	}

	error = mip4_power_on(ts);
	if (error)
		return error;
	error = mip4_query_device(ts);
	mip4_power_off(ts);
	if (error)
		return error;

	input->name = "MELFAS MIP4 Touchscreen";
	input->phys = ts->phys;

	input->id.bustype = BUS_I2C;
	input->id.vendor = 0x13c5;

	input->open = mip4_input_open;
	input->close = mip4_input_close;

	input_set_drvdata(input, ts);

	input->keycode = ts->key_code;
	input->keycodesize = sizeof(*ts->key_code);
	input->keycodemax = ts->key_num;

	input_set_abs_params(input, ABS_MT_POSITION_X, 0, ts->max_x, 0, 0);
	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0);
	input_set_abs_params(input, ABS_MT_PRESSURE,
			     MIP4_PRESSURE_MIN, MIP4_PRESSURE_MAX, 0, 0);
	input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
			     MIP4_TOUCH_MAJOR_MIN, MIP4_TOUCH_MAJOR_MAX, 0, 0);
	input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
			     MIP4_TOUCH_MINOR_MIN, MIP4_TOUCH_MINOR_MAX, 0, 0);
	input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->ppm_x);
	input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->ppm_y);

	error = input_mt_init_slots(input, MIP4_MAX_FINGERS, INPUT_MT_DIRECT);
	if (error)
		return error;

	i2c_set_clientdata(client, ts);

	error = devm_request_threaded_irq(&client->dev, client->irq,
					  NULL, mip4_interrupt,
					  IRQF_ONESHOT, MIP4_DEVICE_NAME, ts);
	if (error) {
		dev_err(&client->dev,
			"Failed to request interrupt %d: %d\n",
			client->irq, error);
		return error;
	}

	disable_irq(client->irq);

	error = input_register_device(input);
	if (error) {
		dev_err(&client->dev,
			"Failed to register input device: %d\n", error);
		return error;
	}

	error = sysfs_create_group(&client->dev.kobj, &mip4_attr_group);
	if (error) {
		dev_err(&client->dev,
			"Failed to create sysfs attribute group: %d\n", error);
		return error;
	}

	error = devm_add_action(&client->dev, mip4_sysfs_remove, ts);
	if (error) {
		mip4_sysfs_remove(ts);
		dev_err(&client->dev,
			"Failed to install sysfs remoce action: %d\n", error);
		return error;
	}

	return 0;
}

static int __maybe_unused mip4_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct mip4_ts *ts = i2c_get_clientdata(client);
	struct input_dev *input = ts->input;

	mutex_lock(&input->mutex);

	if (device_may_wakeup(dev))
		ts->wake_irq_enabled = enable_irq_wake(client->irq) == 0;
	else if (input->users)
		mip4_disable(ts);

	mutex_unlock(&input->mutex);

	return 0;
}

static int __maybe_unused mip4_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct mip4_ts *ts = i2c_get_clientdata(client);
	struct input_dev *input = ts->input;

	mutex_lock(&input->mutex);

	if (ts->wake_irq_enabled)
		disable_irq_wake(client->irq);
	else if (input->users)
		mip4_enable(ts);

	mutex_unlock(&input->mutex);

	return 0;
}

static SIMPLE_DEV_PM_OPS(mip4_pm_ops, mip4_suspend, mip4_resume);

#ifdef CONFIG_OF
static const struct of_device_id mip4_of_match[] = {
	{ .compatible = "melfas,"MIP4_DEVICE_NAME, },
	{ },
};
MODULE_DEVICE_TABLE(of, mip4_of_match);
#endif

#ifdef CONFIG_ACPI
static const struct acpi_device_id mip4_acpi_match[] = {
	{ "MLFS0000", 0},
	{ },
};
MODULE_DEVICE_TABLE(acpi, mip4_acpi_match);
#endif

static const struct i2c_device_id mip4_i2c_ids[] = {
	{ MIP4_DEVICE_NAME, 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, mip4_i2c_ids);

static struct i2c_driver mip4_driver = {
	.id_table = mip4_i2c_ids,
	.probe = mip4_probe,
	.driver = {
		.name = MIP4_DEVICE_NAME,
		.of_match_table = of_match_ptr(mip4_of_match),
		.acpi_match_table = ACPI_PTR(mip4_acpi_match),
		.pm = &mip4_pm_ops,
	},
};
module_i2c_driver(mip4_driver);

MODULE_DESCRIPTION("MELFAS MIP4 Touchscreen");
MODULE_VERSION("2016.03.12");
MODULE_AUTHOR("Sangwon Jee <jeesw@melfas.com>");
MODULE_LICENSE("GPL");