summaryrefslogtreecommitdiffstats
path: root/drivers/input/touchscreen/goodix.c
blob: 02c75ea385e08e5d5c14322a42ac0f6a98ae3035 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Driver for Goodix Touchscreens
 *
 *  Copyright (c) 2014 Red Hat Inc.
 *  Copyright (c) 2015 K. Merker <merker@debian.org>
 *
 *  This code is based on gt9xx.c authored by andrew@goodix.com:
 *
 *  2010 - 2012 Goodix Technology.
 */


#include <linux/kernel.h>
#include <linux/dmi.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/input/touchscreen.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/of.h>
#include <asm/unaligned.h>

#define GOODIX_GPIO_INT_NAME		"irq"
#define GOODIX_GPIO_RST_NAME		"reset"

#define GOODIX_MAX_HEIGHT		4096
#define GOODIX_MAX_WIDTH		4096
#define GOODIX_INT_TRIGGER		1
#define GOODIX_CONTACT_SIZE		8
#define GOODIX_MAX_CONTACT_SIZE		9
#define GOODIX_MAX_CONTACTS		10
#define GOODIX_MAX_KEYS			7

#define GOODIX_CONFIG_MIN_LENGTH	186
#define GOODIX_CONFIG_911_LENGTH	186
#define GOODIX_CONFIG_967_LENGTH	228
#define GOODIX_CONFIG_GT9X_LENGTH	240
#define GOODIX_CONFIG_MAX_LENGTH	240

/* Register defines */
#define GOODIX_REG_COMMAND		0x8040
#define GOODIX_CMD_SCREEN_OFF		0x05

#define GOODIX_READ_COOR_ADDR		0x814E
#define GOODIX_GT1X_REG_CONFIG_DATA	0x8050
#define GOODIX_GT9X_REG_CONFIG_DATA	0x8047
#define GOODIX_REG_ID			0x8140

#define GOODIX_BUFFER_STATUS_READY	BIT(7)
#define GOODIX_HAVE_KEY			BIT(4)
#define GOODIX_BUFFER_STATUS_TIMEOUT	20

#define RESOLUTION_LOC		1
#define MAX_CONTACTS_LOC	5
#define TRIGGER_LOC		6

/* Our special handling for GPIO accesses through ACPI is x86 specific */
#if defined CONFIG_X86 && defined CONFIG_ACPI
#define ACPI_GPIO_SUPPORT
#endif

struct goodix_ts_data;

enum goodix_irq_pin_access_method {
	IRQ_PIN_ACCESS_NONE,
	IRQ_PIN_ACCESS_GPIO,
	IRQ_PIN_ACCESS_ACPI_GPIO,
	IRQ_PIN_ACCESS_ACPI_METHOD,
};

struct goodix_chip_data {
	u16 config_addr;
	int config_len;
	int (*check_config)(struct goodix_ts_data *ts, const u8 *cfg, int len);
	void (*calc_config_checksum)(struct goodix_ts_data *ts);
};

struct goodix_chip_id {
	const char *id;
	const struct goodix_chip_data *data;
};

#define GOODIX_ID_MAX_LEN	4

struct goodix_ts_data {
	struct i2c_client *client;
	struct input_dev *input_dev;
	const struct goodix_chip_data *chip;
	struct touchscreen_properties prop;
	unsigned int max_touch_num;
	unsigned int int_trigger_type;
	struct regulator *avdd28;
	struct regulator *vddio;
	struct gpio_desc *gpiod_int;
	struct gpio_desc *gpiod_rst;
	int gpio_count;
	int gpio_int_idx;
	char id[GOODIX_ID_MAX_LEN + 1];
	u16 version;
	const char *cfg_name;
	bool reset_controller_at_probe;
	bool load_cfg_from_disk;
	struct completion firmware_loading_complete;
	unsigned long irq_flags;
	enum goodix_irq_pin_access_method irq_pin_access_method;
	unsigned int contact_size;
	u8 config[GOODIX_CONFIG_MAX_LENGTH];
	unsigned short keymap[GOODIX_MAX_KEYS];
};

static int goodix_check_cfg_8(struct goodix_ts_data *ts,
			      const u8 *cfg, int len);
static int goodix_check_cfg_16(struct goodix_ts_data *ts,
			       const u8 *cfg, int len);
static void goodix_calc_cfg_checksum_8(struct goodix_ts_data *ts);
static void goodix_calc_cfg_checksum_16(struct goodix_ts_data *ts);

static const struct goodix_chip_data gt1x_chip_data = {
	.config_addr		= GOODIX_GT1X_REG_CONFIG_DATA,
	.config_len		= GOODIX_CONFIG_GT9X_LENGTH,
	.check_config		= goodix_check_cfg_16,
	.calc_config_checksum	= goodix_calc_cfg_checksum_16,
};

static const struct goodix_chip_data gt911_chip_data = {
	.config_addr		= GOODIX_GT9X_REG_CONFIG_DATA,
	.config_len		= GOODIX_CONFIG_911_LENGTH,
	.check_config		= goodix_check_cfg_8,
	.calc_config_checksum	= goodix_calc_cfg_checksum_8,
};

static const struct goodix_chip_data gt967_chip_data = {
	.config_addr		= GOODIX_GT9X_REG_CONFIG_DATA,
	.config_len		= GOODIX_CONFIG_967_LENGTH,
	.check_config		= goodix_check_cfg_8,
	.calc_config_checksum	= goodix_calc_cfg_checksum_8,
};

static const struct goodix_chip_data gt9x_chip_data = {
	.config_addr		= GOODIX_GT9X_REG_CONFIG_DATA,
	.config_len		= GOODIX_CONFIG_GT9X_LENGTH,
	.check_config		= goodix_check_cfg_8,
	.calc_config_checksum	= goodix_calc_cfg_checksum_8,
};

static const struct goodix_chip_id goodix_chip_ids[] = {
	{ .id = "1151", .data = &gt1x_chip_data },
	{ .id = "5663", .data = &gt1x_chip_data },
	{ .id = "5688", .data = &gt1x_chip_data },
	{ .id = "917S", .data = &gt1x_chip_data },

	{ .id = "911", .data = &gt911_chip_data },
	{ .id = "9271", .data = &gt911_chip_data },
	{ .id = "9110", .data = &gt911_chip_data },
	{ .id = "927", .data = &gt911_chip_data },
	{ .id = "928", .data = &gt911_chip_data },

	{ .id = "912", .data = &gt967_chip_data },
	{ .id = "9147", .data = &gt967_chip_data },
	{ .id = "967", .data = &gt967_chip_data },
	{ }
};

static const unsigned long goodix_irq_flags[] = {
	IRQ_TYPE_EDGE_RISING,
	IRQ_TYPE_EDGE_FALLING,
	IRQ_TYPE_LEVEL_LOW,
	IRQ_TYPE_LEVEL_HIGH,
};

/*
 * Those tablets have their coordinates origin at the bottom right
 * of the tablet, as if rotated 180 degrees
 */
static const struct dmi_system_id rotated_screen[] = {
#if defined(CONFIG_DMI) && defined(CONFIG_X86)
	{
		.ident = "Teclast X89",
		.matches = {
			/* tPAD is too generic, also match on bios date */
			DMI_MATCH(DMI_BOARD_VENDOR, "TECLAST"),
			DMI_MATCH(DMI_BOARD_NAME, "tPAD"),
			DMI_MATCH(DMI_BIOS_DATE, "12/19/2014"),
		},
	},
	{
		.ident = "WinBook TW100",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
			DMI_MATCH(DMI_PRODUCT_NAME, "TW100")
		}
	},
	{
		.ident = "WinBook TW700",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
			DMI_MATCH(DMI_PRODUCT_NAME, "TW700")
		},
	},
#endif
	{}
};

static const struct dmi_system_id nine_bytes_report[] = {
#if defined(CONFIG_DMI) && defined(CONFIG_X86)
	{
		.ident = "Lenovo YogaBook",
		/* YB1-X91L/F and YB1-X90L/F */
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "Lenovo YB1-X9")
		}
	},
#endif
	{}
};

/*
 * Those tablets have their x coordinate inverted
 */
static const struct dmi_system_id inverted_x_screen[] = {
#if defined(CONFIG_DMI) && defined(CONFIG_X86)
	{
		.ident = "Cube I15-TC",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Cube"),
			DMI_MATCH(DMI_PRODUCT_NAME, "I15-TC")
		},
	},
#endif
	{}
};

/**
 * goodix_i2c_read - read data from a register of the i2c slave device.
 *
 * @client: i2c device.
 * @reg: the register to read from.
 * @buf: raw write data buffer.
 * @len: length of the buffer to write
 */
static int goodix_i2c_read(struct i2c_client *client,
			   u16 reg, u8 *buf, int len)
{
	struct i2c_msg msgs[2];
	__be16 wbuf = cpu_to_be16(reg);
	int ret;

	msgs[0].flags = 0;
	msgs[0].addr  = client->addr;
	msgs[0].len   = 2;
	msgs[0].buf   = (u8 *)&wbuf;

	msgs[1].flags = I2C_M_RD;
	msgs[1].addr  = client->addr;
	msgs[1].len   = len;
	msgs[1].buf   = buf;

	ret = i2c_transfer(client->adapter, msgs, 2);
	return ret < 0 ? ret : (ret != ARRAY_SIZE(msgs) ? -EIO : 0);
}

/**
 * goodix_i2c_write - write data to a register of the i2c slave device.
 *
 * @client: i2c device.
 * @reg: the register to write to.
 * @buf: raw data buffer to write.
 * @len: length of the buffer to write
 */
static int goodix_i2c_write(struct i2c_client *client, u16 reg, const u8 *buf,
			    unsigned len)
{
	u8 *addr_buf;
	struct i2c_msg msg;
	int ret;

	addr_buf = kmalloc(len + 2, GFP_KERNEL);
	if (!addr_buf)
		return -ENOMEM;

	addr_buf[0] = reg >> 8;
	addr_buf[1] = reg & 0xFF;
	memcpy(&addr_buf[2], buf, len);

	msg.flags = 0;
	msg.addr = client->addr;
	msg.buf = addr_buf;
	msg.len = len + 2;

	ret = i2c_transfer(client->adapter, &msg, 1);
	kfree(addr_buf);
	return ret < 0 ? ret : (ret != 1 ? -EIO : 0);
}

static int goodix_i2c_write_u8(struct i2c_client *client, u16 reg, u8 value)
{
	return goodix_i2c_write(client, reg, &value, sizeof(value));
}

static const struct goodix_chip_data *goodix_get_chip_data(const char *id)
{
	unsigned int i;

	for (i = 0; goodix_chip_ids[i].id; i++) {
		if (!strcmp(goodix_chip_ids[i].id, id))
			return goodix_chip_ids[i].data;
	}

	return &gt9x_chip_data;
}

static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data)
{
	unsigned long max_timeout;
	int touch_num;
	int error;
	u16 addr = GOODIX_READ_COOR_ADDR;
	/*
	 * We are going to read 1-byte header,
	 * ts->contact_size * max(1, touch_num) bytes of coordinates
	 * and 1-byte footer which contains the touch-key code.
	 */
	const int header_contact_keycode_size = 1 + ts->contact_size + 1;

	/*
	 * The 'buffer status' bit, which indicates that the data is valid, is
	 * not set as soon as the interrupt is raised, but slightly after.
	 * This takes around 10 ms to happen, so we poll for 20 ms.
	 */
	max_timeout = jiffies + msecs_to_jiffies(GOODIX_BUFFER_STATUS_TIMEOUT);
	do {
		error = goodix_i2c_read(ts->client, addr, data,
					header_contact_keycode_size);
		if (error) {
			dev_err(&ts->client->dev, "I2C transfer error: %d\n",
					error);
			return error;
		}

		if (data[0] & GOODIX_BUFFER_STATUS_READY) {
			touch_num = data[0] & 0x0f;
			if (touch_num > ts->max_touch_num)
				return -EPROTO;

			if (touch_num > 1) {
				addr += header_contact_keycode_size;
				data += header_contact_keycode_size;
				error = goodix_i2c_read(ts->client,
						addr, data,
						ts->contact_size *
							(touch_num - 1));
				if (error)
					return error;
			}

			return touch_num;
		}

		usleep_range(1000, 2000); /* Poll every 1 - 2 ms */
	} while (time_before(jiffies, max_timeout));

	/*
	 * The Goodix panel will send spurious interrupts after a
	 * 'finger up' event, which will always cause a timeout.
	 */
	return -ENOMSG;
}

static void goodix_ts_report_touch_8b(struct goodix_ts_data *ts, u8 *coor_data)
{
	int id = coor_data[0] & 0x0F;
	int input_x = get_unaligned_le16(&coor_data[1]);
	int input_y = get_unaligned_le16(&coor_data[3]);
	int input_w = get_unaligned_le16(&coor_data[5]);

	input_mt_slot(ts->input_dev, id);
	input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
	touchscreen_report_pos(ts->input_dev, &ts->prop,
			       input_x, input_y, true);
	input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w);
	input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w);
}

static void goodix_ts_report_touch_9b(struct goodix_ts_data *ts, u8 *coor_data)
{
	int id = coor_data[1] & 0x0F;
	int input_x = get_unaligned_le16(&coor_data[3]);
	int input_y = get_unaligned_le16(&coor_data[5]);
	int input_w = get_unaligned_le16(&coor_data[7]);

	input_mt_slot(ts->input_dev, id);
	input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
	touchscreen_report_pos(ts->input_dev, &ts->prop,
			       input_x, input_y, true);
	input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w);
	input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w);
}

static void goodix_ts_report_key(struct goodix_ts_data *ts, u8 *data)
{
	int touch_num;
	u8 key_value;
	int i;

	if (data[0] & GOODIX_HAVE_KEY) {
		touch_num = data[0] & 0x0f;
		key_value = data[1 + ts->contact_size * touch_num];
		for (i = 0; i < GOODIX_MAX_KEYS; i++)
			if (key_value & BIT(i))
				input_report_key(ts->input_dev,
						 ts->keymap[i], 1);
	} else {
		for (i = 0; i < GOODIX_MAX_KEYS; i++)
			input_report_key(ts->input_dev, ts->keymap[i], 0);
	}
}

/**
 * goodix_process_events - Process incoming events
 *
 * @ts: our goodix_ts_data pointer
 *
 * Called when the IRQ is triggered. Read the current device state, and push
 * the input events to the user space.
 */
static void goodix_process_events(struct goodix_ts_data *ts)
{
	u8  point_data[2 + GOODIX_MAX_CONTACT_SIZE * GOODIX_MAX_CONTACTS];
	int touch_num;
	int i;

	touch_num = goodix_ts_read_input_report(ts, point_data);
	if (touch_num < 0)
		return;

	goodix_ts_report_key(ts, point_data);

	for (i = 0; i < touch_num; i++)
		if (ts->contact_size == 9)
			goodix_ts_report_touch_9b(ts,
				&point_data[1 + ts->contact_size * i]);
		else
			goodix_ts_report_touch_8b(ts,
				&point_data[1 + ts->contact_size * i]);

	input_mt_sync_frame(ts->input_dev);
	input_sync(ts->input_dev);
}

/**
 * goodix_ts_irq_handler - The IRQ handler
 *
 * @irq: interrupt number.
 * @dev_id: private data pointer.
 */
static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id)
{
	struct goodix_ts_data *ts = dev_id;

	goodix_process_events(ts);

	if (goodix_i2c_write_u8(ts->client, GOODIX_READ_COOR_ADDR, 0) < 0)
		dev_err(&ts->client->dev, "I2C write end_cmd error\n");

	return IRQ_HANDLED;
}

static void goodix_free_irq(struct goodix_ts_data *ts)
{
	devm_free_irq(&ts->client->dev, ts->client->irq, ts);
}

static int goodix_request_irq(struct goodix_ts_data *ts)
{
	return devm_request_threaded_irq(&ts->client->dev, ts->client->irq,
					 NULL, goodix_ts_irq_handler,
					 ts->irq_flags, ts->client->name, ts);
}

static int goodix_check_cfg_8(struct goodix_ts_data *ts, const u8 *cfg, int len)
{
	int i, raw_cfg_len = len - 2;
	u8 check_sum = 0;

	for (i = 0; i < raw_cfg_len; i++)
		check_sum += cfg[i];
	check_sum = (~check_sum) + 1;
	if (check_sum != cfg[raw_cfg_len]) {
		dev_err(&ts->client->dev,
			"The checksum of the config fw is not correct");
		return -EINVAL;
	}

	if (cfg[raw_cfg_len + 1] != 1) {
		dev_err(&ts->client->dev,
			"Config fw must have Config_Fresh register set");
		return -EINVAL;
	}

	return 0;
}

static void goodix_calc_cfg_checksum_8(struct goodix_ts_data *ts)
{
	int i, raw_cfg_len = ts->chip->config_len - 2;
	u8 check_sum = 0;

	for (i = 0; i < raw_cfg_len; i++)
		check_sum += ts->config[i];
	check_sum = (~check_sum) + 1;

	ts->config[raw_cfg_len] = check_sum;
	ts->config[raw_cfg_len + 1] = 1; /* Set "config_fresh" bit */
}

static int goodix_check_cfg_16(struct goodix_ts_data *ts, const u8 *cfg,
			       int len)
{
	int i, raw_cfg_len = len - 3;
	u16 check_sum = 0;

	for (i = 0; i < raw_cfg_len; i += 2)
		check_sum += get_unaligned_be16(&cfg[i]);
	check_sum = (~check_sum) + 1;
	if (check_sum != get_unaligned_be16(&cfg[raw_cfg_len])) {
		dev_err(&ts->client->dev,
			"The checksum of the config fw is not correct");
		return -EINVAL;
	}

	if (cfg[raw_cfg_len + 2] != 1) {
		dev_err(&ts->client->dev,
			"Config fw must have Config_Fresh register set");
		return -EINVAL;
	}

	return 0;
}

static void goodix_calc_cfg_checksum_16(struct goodix_ts_data *ts)
{
	int i, raw_cfg_len = ts->chip->config_len - 3;
	u16 check_sum = 0;

	for (i = 0; i < raw_cfg_len; i += 2)
		check_sum += get_unaligned_be16(&ts->config[i]);
	check_sum = (~check_sum) + 1;

	put_unaligned_be16(check_sum, &ts->config[raw_cfg_len]);
	ts->config[raw_cfg_len + 2] = 1; /* Set "config_fresh" bit */
}

/**
 * goodix_check_cfg - Checks if config fw is valid
 *
 * @ts: goodix_ts_data pointer
 * @cfg: firmware config data
 */
static int goodix_check_cfg(struct goodix_ts_data *ts, const u8 *cfg, int len)
{
	if (len < GOODIX_CONFIG_MIN_LENGTH ||
	    len > GOODIX_CONFIG_MAX_LENGTH) {
		dev_err(&ts->client->dev,
			"The length of the config fw is not correct");
		return -EINVAL;
	}

	return ts->chip->check_config(ts, cfg, len);
}

/**
 * goodix_send_cfg - Write fw config to device
 *
 * @ts: goodix_ts_data pointer
 * @cfg: config firmware to write to device
 */
static int goodix_send_cfg(struct goodix_ts_data *ts, const u8 *cfg, int len)
{
	int error;

	error = goodix_check_cfg(ts, cfg, len);
	if (error)
		return error;

	error = goodix_i2c_write(ts->client, ts->chip->config_addr, cfg, len);
	if (error) {
		dev_err(&ts->client->dev, "Failed to write config data: %d",
			error);
		return error;
	}
	dev_dbg(&ts->client->dev, "Config sent successfully.");

	/* Let the firmware reconfigure itself, so sleep for 10ms */
	usleep_range(10000, 11000);

	return 0;
}

#ifdef ACPI_GPIO_SUPPORT
static int goodix_pin_acpi_direction_input(struct goodix_ts_data *ts)
{
	acpi_handle handle = ACPI_HANDLE(&ts->client->dev);
	acpi_status status;

	status = acpi_evaluate_object(handle, "INTI", NULL, NULL);
	return ACPI_SUCCESS(status) ? 0 : -EIO;
}

static int goodix_pin_acpi_output_method(struct goodix_ts_data *ts, int value)
{
	acpi_handle handle = ACPI_HANDLE(&ts->client->dev);
	acpi_status status;

	status = acpi_execute_simple_method(handle, "INTO", value);
	return ACPI_SUCCESS(status) ? 0 : -EIO;
}
#else
static int goodix_pin_acpi_direction_input(struct goodix_ts_data *ts)
{
	dev_err(&ts->client->dev,
		"%s called on device without ACPI support\n", __func__);
	return -EINVAL;
}

static int goodix_pin_acpi_output_method(struct goodix_ts_data *ts, int value)
{
	dev_err(&ts->client->dev,
		"%s called on device without ACPI support\n", __func__);
	return -EINVAL;
}
#endif

static int goodix_irq_direction_output(struct goodix_ts_data *ts, int value)
{
	switch (ts->irq_pin_access_method) {
	case IRQ_PIN_ACCESS_NONE:
		dev_err(&ts->client->dev,
			"%s called without an irq_pin_access_method set\n",
			__func__);
		return -EINVAL;
	case IRQ_PIN_ACCESS_GPIO:
		return gpiod_direction_output(ts->gpiod_int, value);
	case IRQ_PIN_ACCESS_ACPI_GPIO:
		/*
		 * The IRQ pin triggers on a falling edge, so its gets marked
		 * as active-low, use output_raw to avoid the value inversion.
		 */
		return gpiod_direction_output_raw(ts->gpiod_int, value);
	case IRQ_PIN_ACCESS_ACPI_METHOD:
		return goodix_pin_acpi_output_method(ts, value);
	}

	return -EINVAL; /* Never reached */
}

static int goodix_irq_direction_input(struct goodix_ts_data *ts)
{
	switch (ts->irq_pin_access_method) {
	case IRQ_PIN_ACCESS_NONE:
		dev_err(&ts->client->dev,
			"%s called without an irq_pin_access_method set\n",
			__func__);
		return -EINVAL;
	case IRQ_PIN_ACCESS_GPIO:
		return gpiod_direction_input(ts->gpiod_int);
	case IRQ_PIN_ACCESS_ACPI_GPIO:
		return gpiod_direction_input(ts->gpiod_int);
	case IRQ_PIN_ACCESS_ACPI_METHOD:
		return goodix_pin_acpi_direction_input(ts);
	}

	return -EINVAL; /* Never reached */
}

static int goodix_int_sync(struct goodix_ts_data *ts)
{
	int error;

	error = goodix_irq_direction_output(ts, 0);
	if (error)
		return error;

	msleep(50);				/* T5: 50ms */

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

	return 0;
}

/**
 * goodix_reset - Reset device during power on
 *
 * @ts: goodix_ts_data pointer
 */
static int goodix_reset(struct goodix_ts_data *ts)
{
	int error;

	/* begin select I2C slave addr */
	error = gpiod_direction_output(ts->gpiod_rst, 0);
	if (error)
		return error;

	msleep(20);				/* T2: > 10ms */

	/* HIGH: 0x28/0x29, LOW: 0xBA/0xBB */
	error = goodix_irq_direction_output(ts, ts->client->addr == 0x14);
	if (error)
		return error;

	usleep_range(100, 2000);		/* T3: > 100us */

	error = gpiod_direction_output(ts->gpiod_rst, 1);
	if (error)
		return error;

	usleep_range(6000, 10000);		/* T4: > 5ms */

	/* end select I2C slave addr */
	error = gpiod_direction_input(ts->gpiod_rst);
	if (error)
		return error;

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

	return 0;
}

#ifdef ACPI_GPIO_SUPPORT
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>

static const struct x86_cpu_id baytrail_cpu_ids[] = {
	{ X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT, X86_FEATURE_ANY, },
	{}
};

static inline bool is_byt(void)
{
	const struct x86_cpu_id *id = x86_match_cpu(baytrail_cpu_ids);

	return !!id;
}

static const struct acpi_gpio_params first_gpio = { 0, 0, false };
static const struct acpi_gpio_params second_gpio = { 1, 0, false };

static const struct acpi_gpio_mapping acpi_goodix_int_first_gpios[] = {
	{ GOODIX_GPIO_INT_NAME "-gpios", &first_gpio, 1 },
	{ GOODIX_GPIO_RST_NAME "-gpios", &second_gpio, 1 },
	{ },
};

static const struct acpi_gpio_mapping acpi_goodix_int_last_gpios[] = {
	{ GOODIX_GPIO_RST_NAME "-gpios", &first_gpio, 1 },
	{ GOODIX_GPIO_INT_NAME "-gpios", &second_gpio, 1 },
	{ },
};

static const struct acpi_gpio_mapping acpi_goodix_reset_only_gpios[] = {
	{ GOODIX_GPIO_RST_NAME "-gpios", &first_gpio, 1 },
	{ },
};

static int goodix_resource(struct acpi_resource *ares, void *data)
{
	struct goodix_ts_data *ts = data;
	struct device *dev = &ts->client->dev;
	struct acpi_resource_gpio *gpio;

	switch (ares->type) {
	case ACPI_RESOURCE_TYPE_GPIO:
		gpio = &ares->data.gpio;
		if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) {
			if (ts->gpio_int_idx == -1) {
				ts->gpio_int_idx = ts->gpio_count;
			} else {
				dev_err(dev, "More then one GpioInt resource, ignoring ACPI GPIO resources\n");
				ts->gpio_int_idx = -2;
			}
		}
		ts->gpio_count++;
		break;
	default:
		break;
	}

	return 0;
}

/*
 * This function gets called in case we fail to get the irq GPIO directly
 * because the ACPI tables lack GPIO-name to APCI _CRS index mappings
 * (no _DSD UUID daffd814-6eba-4d8c-8a91-bc9bbf4aa301 data).
 * In that case we add our own mapping and then goodix_get_gpio_config()
 * retries to get the GPIOs based on the added mapping.
 */
static int goodix_add_acpi_gpio_mappings(struct goodix_ts_data *ts)
{
	const struct acpi_gpio_mapping *gpio_mapping = NULL;
	struct device *dev = &ts->client->dev;
	LIST_HEAD(resources);
	int ret;

	ts->gpio_count = 0;
	ts->gpio_int_idx = -1;
	ret = acpi_dev_get_resources(ACPI_COMPANION(dev), &resources,
				     goodix_resource, ts);
	if (ret < 0) {
		dev_err(dev, "Error getting ACPI resources: %d\n", ret);
		return ret;
	}

	acpi_dev_free_resource_list(&resources);

	if (ts->gpio_count == 2 && ts->gpio_int_idx == 0) {
		ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO;
		gpio_mapping = acpi_goodix_int_first_gpios;
	} else if (ts->gpio_count == 2 && ts->gpio_int_idx == 1) {
		ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO;
		gpio_mapping = acpi_goodix_int_last_gpios;
	} else if (ts->gpio_count == 1 && ts->gpio_int_idx == -1 &&
		   acpi_has_method(ACPI_HANDLE(dev), "INTI") &&
		   acpi_has_method(ACPI_HANDLE(dev), "INTO")) {
		dev_info(dev, "Using ACPI INTI and INTO methods for IRQ pin access\n");
		ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_METHOD;
		gpio_mapping = acpi_goodix_reset_only_gpios;
	} else if (is_byt() && ts->gpio_count == 2 && ts->gpio_int_idx == -1) {
		dev_info(dev, "No ACPI GpioInt resource, assuming that the GPIO order is reset, int\n");
		ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO;
		gpio_mapping = acpi_goodix_int_last_gpios;
	} else {
		dev_warn(dev, "Unexpected ACPI resources: gpio_count %d, gpio_int_idx %d\n",
			 ts->gpio_count, ts->gpio_int_idx);
		return -EINVAL;
	}

	return devm_acpi_dev_add_driver_gpios(dev, gpio_mapping);
}
#else
static int goodix_add_acpi_gpio_mappings(struct goodix_ts_data *ts)
{
	return -EINVAL;
}
#endif /* CONFIG_X86 && CONFIG_ACPI */

/**
 * goodix_get_gpio_config - Get GPIO config from ACPI/DT
 *
 * @ts: goodix_ts_data pointer
 */
static int goodix_get_gpio_config(struct goodix_ts_data *ts)
{
	int error;
	struct device *dev;
	struct gpio_desc *gpiod;
	bool added_acpi_mappings = false;

	if (!ts->client)
		return -EINVAL;
	dev = &ts->client->dev;

	ts->avdd28 = devm_regulator_get(dev, "AVDD28");
	if (IS_ERR(ts->avdd28)) {
		error = PTR_ERR(ts->avdd28);
		if (error != -EPROBE_DEFER)
			dev_err(dev,
				"Failed to get AVDD28 regulator: %d\n", error);
		return error;
	}

	ts->vddio = devm_regulator_get(dev, "VDDIO");
	if (IS_ERR(ts->vddio)) {
		error = PTR_ERR(ts->vddio);
		if (error != -EPROBE_DEFER)
			dev_err(dev,
				"Failed to get VDDIO regulator: %d\n", error);
		return error;
	}

retry_get_irq_gpio:
	/* Get the interrupt GPIO pin number */
	gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_INT_NAME, GPIOD_IN);
	if (IS_ERR(gpiod)) {
		error = PTR_ERR(gpiod);
		if (error != -EPROBE_DEFER)
			dev_dbg(dev, "Failed to get %s GPIO: %d\n",
				GOODIX_GPIO_INT_NAME, error);
		return error;
	}
	if (!gpiod && has_acpi_companion(dev) && !added_acpi_mappings) {
		added_acpi_mappings = true;
		if (goodix_add_acpi_gpio_mappings(ts) == 0)
			goto retry_get_irq_gpio;
	}

	ts->gpiod_int = gpiod;

	/* Get the reset line GPIO pin number */
	gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_RST_NAME, GPIOD_IN);
	if (IS_ERR(gpiod)) {
		error = PTR_ERR(gpiod);
		if (error != -EPROBE_DEFER)
			dev_dbg(dev, "Failed to get %s GPIO: %d\n",
				GOODIX_GPIO_RST_NAME, error);
		return error;
	}

	ts->gpiod_rst = gpiod;

	switch (ts->irq_pin_access_method) {
	case IRQ_PIN_ACCESS_ACPI_GPIO:
		/*
		 * We end up here if goodix_add_acpi_gpio_mappings() has
		 * called devm_acpi_dev_add_driver_gpios() because the ACPI
		 * tables did not contain name to index mappings.
		 * Check that we successfully got both GPIOs after we've
		 * added our own acpi_gpio_mapping and if we did not get both
		 * GPIOs reset irq_pin_access_method to IRQ_PIN_ACCESS_NONE.
		 */
		if (!ts->gpiod_int || !ts->gpiod_rst)
			ts->irq_pin_access_method = IRQ_PIN_ACCESS_NONE;
		break;
	case IRQ_PIN_ACCESS_ACPI_METHOD:
		if (!ts->gpiod_rst)
			ts->irq_pin_access_method = IRQ_PIN_ACCESS_NONE;
		break;
	default:
		if (ts->gpiod_int && ts->gpiod_rst) {
			ts->reset_controller_at_probe = true;
			ts->load_cfg_from_disk = true;
			ts->irq_pin_access_method = IRQ_PIN_ACCESS_GPIO;
		}
	}

	return 0;
}

/**
 * goodix_read_config - Read the embedded configuration of the panel
 *
 * @ts: our goodix_ts_data pointer
 *
 * Must be called during probe
 */
static void goodix_read_config(struct goodix_ts_data *ts)
{
	int x_max, y_max;
	int error;

	error = goodix_i2c_read(ts->client, ts->chip->config_addr,
				ts->config, ts->chip->config_len);
	if (error) {
		dev_warn(&ts->client->dev, "Error reading config: %d\n",
			 error);
		ts->int_trigger_type = GOODIX_INT_TRIGGER;
		ts->max_touch_num = GOODIX_MAX_CONTACTS;
		return;
	}

	ts->int_trigger_type = ts->config[TRIGGER_LOC] & 0x03;
	ts->max_touch_num = ts->config[MAX_CONTACTS_LOC] & 0x0f;

	x_max = get_unaligned_le16(&ts->config[RESOLUTION_LOC]);
	y_max = get_unaligned_le16(&ts->config[RESOLUTION_LOC + 2]);
	if (x_max && y_max) {
		input_abs_set_max(ts->input_dev, ABS_MT_POSITION_X, x_max - 1);
		input_abs_set_max(ts->input_dev, ABS_MT_POSITION_Y, y_max - 1);
	}

	ts->chip->calc_config_checksum(ts);
}

/**
 * goodix_read_version - Read goodix touchscreen version
 *
 * @ts: our goodix_ts_data pointer
 */
static int goodix_read_version(struct goodix_ts_data *ts)
{
	int error;
	u8 buf[6];
	char id_str[GOODIX_ID_MAX_LEN + 1];

	error = goodix_i2c_read(ts->client, GOODIX_REG_ID, buf, sizeof(buf));
	if (error) {
		dev_err(&ts->client->dev, "read version failed: %d\n", error);
		return error;
	}

	memcpy(id_str, buf, GOODIX_ID_MAX_LEN);
	id_str[GOODIX_ID_MAX_LEN] = 0;
	strscpy(ts->id, id_str, GOODIX_ID_MAX_LEN + 1);

	ts->version = get_unaligned_le16(&buf[4]);

	dev_info(&ts->client->dev, "ID %s, version: %04x\n", ts->id,
		 ts->version);

	return 0;
}

/**
 * goodix_i2c_test - I2C test function to check if the device answers.
 *
 * @client: the i2c client
 */
static int goodix_i2c_test(struct i2c_client *client)
{
	int retry = 0;
	int error;
	u8 test;

	while (retry++ < 2) {
		error = goodix_i2c_read(client, GOODIX_REG_ID,
					&test, 1);
		if (!error)
			return 0;

		dev_err(&client->dev, "i2c test failed attempt %d: %d\n",
			retry, error);
		msleep(20);
	}

	return error;
}

/**
 * goodix_configure_dev - Finish device initialization
 *
 * @ts: our goodix_ts_data pointer
 *
 * Must be called from probe to finish initialization of the device.
 * Contains the common initialization code for both devices that
 * declare gpio pins and devices that do not. It is either called
 * directly from probe or from request_firmware_wait callback.
 */
static int goodix_configure_dev(struct goodix_ts_data *ts)
{
	int error;
	int i;

	ts->int_trigger_type = GOODIX_INT_TRIGGER;
	ts->max_touch_num = GOODIX_MAX_CONTACTS;

	ts->input_dev = devm_input_allocate_device(&ts->client->dev);
	if (!ts->input_dev) {
		dev_err(&ts->client->dev, "Failed to allocate input device.");
		return -ENOMEM;
	}

	ts->input_dev->name = "Goodix Capacitive TouchScreen";
	ts->input_dev->phys = "input/ts";
	ts->input_dev->id.bustype = BUS_I2C;
	ts->input_dev->id.vendor = 0x0416;
	if (kstrtou16(ts->id, 10, &ts->input_dev->id.product))
		ts->input_dev->id.product = 0x1001;
	ts->input_dev->id.version = ts->version;

	ts->input_dev->keycode = ts->keymap;
	ts->input_dev->keycodesize = sizeof(ts->keymap[0]);
	ts->input_dev->keycodemax = GOODIX_MAX_KEYS;

	/* Capacitive Windows/Home button on some devices */
	for (i = 0; i < GOODIX_MAX_KEYS; ++i) {
		if (i == 0)
			ts->keymap[i] = KEY_LEFTMETA;
		else
			ts->keymap[i] = KEY_F1 + (i - 1);

		input_set_capability(ts->input_dev, EV_KEY, ts->keymap[i]);
	}

	input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X);
	input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y);
	input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
	input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);

	/* Read configuration and apply touchscreen parameters */
	goodix_read_config(ts);

	/* Try overriding touchscreen parameters via device properties */
	touchscreen_parse_properties(ts->input_dev, true, &ts->prop);

	if (!ts->prop.max_x || !ts->prop.max_y || !ts->max_touch_num) {
		dev_err(&ts->client->dev,
			"Invalid config (%d, %d, %d), using defaults\n",
			ts->prop.max_x, ts->prop.max_y, ts->max_touch_num);
		ts->prop.max_x = GOODIX_MAX_WIDTH - 1;
		ts->prop.max_y = GOODIX_MAX_HEIGHT - 1;
		ts->max_touch_num = GOODIX_MAX_CONTACTS;
		input_abs_set_max(ts->input_dev,
				  ABS_MT_POSITION_X, ts->prop.max_x);
		input_abs_set_max(ts->input_dev,
				  ABS_MT_POSITION_Y, ts->prop.max_y);
	}

	if (dmi_check_system(rotated_screen)) {
		ts->prop.invert_x = true;
		ts->prop.invert_y = true;
		dev_dbg(&ts->client->dev,
			"Applying '180 degrees rotated screen' quirk\n");
	}

	if (dmi_check_system(nine_bytes_report)) {
		ts->contact_size = 9;

		dev_dbg(&ts->client->dev,
			"Non-standard 9-bytes report format quirk\n");
	}

	if (dmi_check_system(inverted_x_screen)) {
		ts->prop.invert_x = true;
		dev_dbg(&ts->client->dev,
			"Applying 'inverted x screen' quirk\n");
	}

	error = input_mt_init_slots(ts->input_dev, ts->max_touch_num,
				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
	if (error) {
		dev_err(&ts->client->dev,
			"Failed to initialize MT slots: %d", error);
		return error;
	}

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

	ts->irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT;
	error = goodix_request_irq(ts);
	if (error) {
		dev_err(&ts->client->dev, "request IRQ failed: %d\n", error);
		return error;
	}

	return 0;
}

/**
 * goodix_config_cb - Callback to finish device init
 *
 * @ts: our goodix_ts_data pointer
 *
 * request_firmware_wait callback that finishes
 * initialization of the device.
 */
static void goodix_config_cb(const struct firmware *cfg, void *ctx)
{
	struct goodix_ts_data *ts = ctx;
	int error;

	if (cfg) {
		/* send device configuration to the firmware */
		error = goodix_send_cfg(ts, cfg->data, cfg->size);
		if (error)
			goto err_release_cfg;
	}

	goodix_configure_dev(ts);

err_release_cfg:
	release_firmware(cfg);
	complete_all(&ts->firmware_loading_complete);
}

static void goodix_disable_regulators(void *arg)
{
	struct goodix_ts_data *ts = arg;

	regulator_disable(ts->vddio);
	regulator_disable(ts->avdd28);
}

static int goodix_ts_probe(struct i2c_client *client,
			   const struct i2c_device_id *id)
{
	struct goodix_ts_data *ts;
	int error;

	dev_dbg(&client->dev, "I2C Address: 0x%02x\n", client->addr);

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		dev_err(&client->dev, "I2C check functionality failed.\n");
		return -ENXIO;
	}

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

	ts->client = client;
	i2c_set_clientdata(client, ts);
	init_completion(&ts->firmware_loading_complete);
	ts->contact_size = GOODIX_CONTACT_SIZE;

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

	/* power up the controller */
	error = regulator_enable(ts->avdd28);
	if (error) {
		dev_err(&client->dev,
			"Failed to enable AVDD28 regulator: %d\n",
			error);
		return error;
	}

	error = regulator_enable(ts->vddio);
	if (error) {
		dev_err(&client->dev,
			"Failed to enable VDDIO regulator: %d\n",
			error);
		regulator_disable(ts->avdd28);
		return error;
	}

	error = devm_add_action_or_reset(&client->dev,
					 goodix_disable_regulators, ts);
	if (error)
		return error;

reset:
	if (ts->reset_controller_at_probe) {
		/* reset the controller */
		error = goodix_reset(ts);
		if (error) {
			dev_err(&client->dev, "Controller reset failed.\n");
			return error;
		}
	}

	error = goodix_i2c_test(client);
	if (error) {
		if (!ts->reset_controller_at_probe &&
		    ts->irq_pin_access_method != IRQ_PIN_ACCESS_NONE) {
			/* Retry after a controller reset */
			ts->reset_controller_at_probe = true;
			goto reset;
		}
		dev_err(&client->dev, "I2C communication failure: %d\n", error);
		return error;
	}

	error = goodix_read_version(ts);
	if (error) {
		dev_err(&client->dev, "Read version failed.\n");
		return error;
	}

	ts->chip = goodix_get_chip_data(ts->id);

	if (ts->load_cfg_from_disk) {
		/* update device config */
		ts->cfg_name = devm_kasprintf(&client->dev, GFP_KERNEL,
					      "goodix_%s_cfg.bin", ts->id);
		if (!ts->cfg_name)
			return -ENOMEM;

		error = request_firmware_nowait(THIS_MODULE, true, ts->cfg_name,
						&client->dev, GFP_KERNEL, ts,
						goodix_config_cb);
		if (error) {
			dev_err(&client->dev,
				"Failed to invoke firmware loader: %d\n",
				error);
			return error;
		}

		return 0;
	} else {
		error = goodix_configure_dev(ts);
		if (error)
			return error;
	}

	return 0;
}

static int goodix_ts_remove(struct i2c_client *client)
{
	struct goodix_ts_data *ts = i2c_get_clientdata(client);

	if (ts->load_cfg_from_disk)
		wait_for_completion(&ts->firmware_loading_complete);

	return 0;
}

static int __maybe_unused goodix_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct goodix_ts_data *ts = i2c_get_clientdata(client);
	int error;

	if (ts->load_cfg_from_disk)
		wait_for_completion(&ts->firmware_loading_complete);

	/* We need gpio pins to suspend/resume */
	if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE) {
		disable_irq(client->irq);
		return 0;
	}

	/* Free IRQ as IRQ pin is used as output in the suspend sequence */
	goodix_free_irq(ts);

	/* Output LOW on the INT pin for 5 ms */
	error = goodix_irq_direction_output(ts, 0);
	if (error) {
		goodix_request_irq(ts);
		return error;
	}

	usleep_range(5000, 6000);

	error = goodix_i2c_write_u8(ts->client, GOODIX_REG_COMMAND,
				    GOODIX_CMD_SCREEN_OFF);
	if (error) {
		dev_err(&ts->client->dev, "Screen off command failed\n");
		goodix_irq_direction_input(ts);
		goodix_request_irq(ts);
		return -EAGAIN;
	}

	/*
	 * The datasheet specifies that the interval between sending screen-off
	 * command and wake-up should be longer than 58 ms. To avoid waking up
	 * sooner, delay 58ms here.
	 */
	msleep(58);
	return 0;
}

static int __maybe_unused goodix_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct goodix_ts_data *ts = i2c_get_clientdata(client);
	u8 config_ver;
	int error;

	if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE) {
		enable_irq(client->irq);
		return 0;
	}

	/*
	 * Exit sleep mode by outputting HIGH level to INT pin
	 * for 2ms~5ms.
	 */
	error = goodix_irq_direction_output(ts, 1);
	if (error)
		return error;

	usleep_range(2000, 5000);

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

	error = goodix_i2c_read(ts->client, ts->chip->config_addr,
				&config_ver, 1);
	if (error)
		dev_warn(dev, "Error reading config version: %d, resetting controller\n",
			 error);
	else if (config_ver != ts->config[0])
		dev_info(dev, "Config version mismatch %d != %d, resetting controller\n",
			 config_ver, ts->config[0]);

	if (error != 0 || config_ver != ts->config[0]) {
		error = goodix_reset(ts);
		if (error) {
			dev_err(dev, "Controller reset failed.\n");
			return error;
		}

		error = goodix_send_cfg(ts, ts->config, ts->chip->config_len);
		if (error)
			return error;
	}

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

	return 0;
}

static SIMPLE_DEV_PM_OPS(goodix_pm_ops, goodix_suspend, goodix_resume);

static const struct i2c_device_id goodix_ts_id[] = {
	{ "GDIX1001:00", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, goodix_ts_id);

#ifdef CONFIG_ACPI
static const struct acpi_device_id goodix_acpi_match[] = {
	{ "GDIX1001", 0 },
	{ "GDIX1002", 0 },
	{ }
};
MODULE_DEVICE_TABLE(acpi, goodix_acpi_match);
#endif

#ifdef CONFIG_OF
static const struct of_device_id goodix_of_match[] = {
	{ .compatible = "goodix,gt1151" },
	{ .compatible = "goodix,gt5663" },
	{ .compatible = "goodix,gt5688" },
	{ .compatible = "goodix,gt911" },
	{ .compatible = "goodix,gt9110" },
	{ .compatible = "goodix,gt912" },
	{ .compatible = "goodix,gt9147" },
	{ .compatible = "goodix,gt917s" },
	{ .compatible = "goodix,gt927" },
	{ .compatible = "goodix,gt9271" },
	{ .compatible = "goodix,gt928" },
	{ .compatible = "goodix,gt967" },
	{ }
};
MODULE_DEVICE_TABLE(of, goodix_of_match);
#endif

static struct i2c_driver goodix_ts_driver = {
	.probe = goodix_ts_probe,
	.remove = goodix_ts_remove,
	.id_table = goodix_ts_id,
	.driver = {
		.name = "Goodix-TS",
		.acpi_match_table = ACPI_PTR(goodix_acpi_match),
		.of_match_table = of_match_ptr(goodix_of_match),
		.pm = &goodix_pm_ops,
	},
};
module_i2c_driver(goodix_ts_driver);

MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");
MODULE_DESCRIPTION("Goodix touchscreen driver");
MODULE_LICENSE("GPL v2");