Linux preempt-rt

Check our new training course

Real-Time Linux with PREEMPT_RT

Check our new training course
with Creative Commons CC-BY-SA
lecture and lab materials

Bootlin logo

Elixir Cross Referencer

   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
// 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 = "9286", .data = &gt1x_chip_data },

	{ .id = "911", .data = &gt911_chip_data },
	{ .id = "9271", .data = &gt911_chip_data },
	{ .id = "9110", .data = &gt911_chip_data },
	{ .id = "9111", .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,
};

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
 * @len: config data length
 */
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
 * @len: config data length
 */
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(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
 *
 * @cfg: firmware config
 * @ctx: 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,gt9286" },
	{ .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");