summaryrefslogtreecommitdiffstats
path: root/drivers/input/touchscreen/edt-ft5x06.c
blob: 8cf8d8d5d4ef4f82b45cc5ecbb959c92be95b699 (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
/*
 * Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
 * Daniel Wagener <daniel.wagener@kernelconcepts.de> (M09 firmware support)
 * Lothar Waßmann <LW@KARO-electronics.de> (DT support)
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*
 * This is a driver for the EDT "Polytouch" family of touch controllers
 * based on the FocalTech FT5x06 line of chips.
 *
 * Development of this driver has been sponsored by Glyn:
 *    http://www.glyn.com/Products/Displays
 */

#include <linux/module.h>
#include <linux/ratelimit.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/i2c.h>
#include <linux/uaccess.h>
#include <linux/delay.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/of_device.h>

#define WORK_REGISTER_THRESHOLD		0x00
#define WORK_REGISTER_REPORT_RATE	0x08
#define WORK_REGISTER_GAIN		0x30
#define WORK_REGISTER_OFFSET		0x31
#define WORK_REGISTER_NUM_X		0x33
#define WORK_REGISTER_NUM_Y		0x34

#define M09_REGISTER_THRESHOLD		0x80
#define M09_REGISTER_GAIN		0x92
#define M09_REGISTER_OFFSET		0x93
#define M09_REGISTER_NUM_X		0x94
#define M09_REGISTER_NUM_Y		0x95

#define NO_REGISTER			0xff

#define WORK_REGISTER_OPMODE		0x3c
#define FACTORY_REGISTER_OPMODE		0x01

#define TOUCH_EVENT_DOWN		0x00
#define TOUCH_EVENT_UP			0x01
#define TOUCH_EVENT_ON			0x02
#define TOUCH_EVENT_RESERVED		0x03

#define EDT_NAME_LEN			23
#define EDT_SWITCH_MODE_RETRIES		10
#define EDT_SWITCH_MODE_DELAY		5 /* msec */
#define EDT_RAW_DATA_RETRIES		100
#define EDT_RAW_DATA_DELAY		1000 /* usec */

enum edt_ver {
	M06,
	M09,
};

struct edt_reg_addr {
	int reg_threshold;
	int reg_report_rate;
	int reg_gain;
	int reg_offset;
	int reg_num_x;
	int reg_num_y;
};

struct edt_ft5x06_ts_data {
	struct i2c_client *client;
	struct input_dev *input;
	struct touchscreen_properties prop;
	u16 num_x;
	u16 num_y;

	struct gpio_desc *reset_gpio;
	struct gpio_desc *wake_gpio;

#if defined(CONFIG_DEBUG_FS)
	struct dentry *debug_dir;
	u8 *raw_buffer;
	size_t raw_bufsize;
#endif

	struct mutex mutex;
	bool factory_mode;
	int threshold;
	int gain;
	int offset;
	int report_rate;
	int max_support_points;

	char name[EDT_NAME_LEN];

	struct edt_reg_addr reg_addr;
	enum edt_ver version;
};

struct edt_i2c_chip_data {
	int  max_support_points;
};

static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
				   u16 wr_len, u8 *wr_buf,
				   u16 rd_len, u8 *rd_buf)
{
	struct i2c_msg wrmsg[2];
	int i = 0;
	int ret;

	if (wr_len) {
		wrmsg[i].addr  = client->addr;
		wrmsg[i].flags = 0;
		wrmsg[i].len = wr_len;
		wrmsg[i].buf = wr_buf;
		i++;
	}
	if (rd_len) {
		wrmsg[i].addr  = client->addr;
		wrmsg[i].flags = I2C_M_RD;
		wrmsg[i].len = rd_len;
		wrmsg[i].buf = rd_buf;
		i++;
	}

	ret = i2c_transfer(client->adapter, wrmsg, i);
	if (ret < 0)
		return ret;
	if (ret != i)
		return -EIO;

	return 0;
}

static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
				    u8 *buf, int buflen)
{
	int i;
	u8 crc = 0;

	for (i = 0; i < buflen - 1; i++)
		crc ^= buf[i];

	if (crc != buf[buflen-1]) {
		dev_err_ratelimited(&tsdata->client->dev,
				    "crc error: 0x%02x expected, got 0x%02x\n",
				    crc, buf[buflen-1]);
		return false;
	}

	return true;
}

static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
{
	struct edt_ft5x06_ts_data *tsdata = dev_id;
	struct device *dev = &tsdata->client->dev;
	u8 cmd;
	u8 rdbuf[63];
	int i, type, x, y, id;
	int offset, tplen, datalen, crclen;
	int error;

	switch (tsdata->version) {
	case M06:
		cmd = 0xf9; /* tell the controller to send touch data */
		offset = 5; /* where the actual touch data starts */
		tplen = 4;  /* data comes in so called frames */
		crclen = 1; /* length of the crc data */
		break;

	case M09:
		cmd = 0x0;
		offset = 3;
		tplen = 6;
		crclen = 0;
		break;

	default:
		goto out;
	}

	memset(rdbuf, 0, sizeof(rdbuf));
	datalen = tplen * tsdata->max_support_points + offset + crclen;

	error = edt_ft5x06_ts_readwrite(tsdata->client,
					sizeof(cmd), &cmd,
					datalen, rdbuf);
	if (error) {
		dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
				    error);
		goto out;
	}

	/* M09 does not send header or CRC */
	if (tsdata->version == M06) {
		if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa ||
			rdbuf[2] != datalen) {
			dev_err_ratelimited(dev,
					"Unexpected header: %02x%02x%02x!\n",
					rdbuf[0], rdbuf[1], rdbuf[2]);
			goto out;
		}

		if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, datalen))
			goto out;
	}

	for (i = 0; i < tsdata->max_support_points; i++) {
		u8 *buf = &rdbuf[i * tplen + offset];
		bool down;

		type = buf[0] >> 6;
		/* ignore Reserved events */
		if (type == TOUCH_EVENT_RESERVED)
			continue;

		/* M06 sometimes sends bogus coordinates in TOUCH_DOWN */
		if (tsdata->version == M06 && type == TOUCH_EVENT_DOWN)
			continue;

		x = ((buf[0] << 8) | buf[1]) & 0x0fff;
		y = ((buf[2] << 8) | buf[3]) & 0x0fff;
		id = (buf[2] >> 4) & 0x0f;
		down = type != TOUCH_EVENT_UP;

		input_mt_slot(tsdata->input, id);
		input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER, down);

		if (!down)
			continue;

		touchscreen_report_pos(tsdata->input, &tsdata->prop, x, y,
				       true);
	}

	input_mt_report_pointer_emulation(tsdata->input, true);
	input_sync(tsdata->input);

out:
	return IRQ_HANDLED;
}

static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
				     u8 addr, u8 value)
{
	u8 wrbuf[4];

	switch (tsdata->version) {
	case M06:
		wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
		wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
		wrbuf[2] = value;
		wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
		return edt_ft5x06_ts_readwrite(tsdata->client, 4,
					wrbuf, 0, NULL);
	case M09:
		wrbuf[0] = addr;
		wrbuf[1] = value;

		return edt_ft5x06_ts_readwrite(tsdata->client, 2,
					wrbuf, 0, NULL);

	default:
		return -EINVAL;
	}
}

static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
				    u8 addr)
{
	u8 wrbuf[2], rdbuf[2];
	int error;

	switch (tsdata->version) {
	case M06:
		wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
		wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
		wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;

		error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2,
						rdbuf);
		if (error)
			return error;

		if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
			dev_err(&tsdata->client->dev,
				"crc error: 0x%02x expected, got 0x%02x\n",
				wrbuf[0] ^ wrbuf[1] ^ rdbuf[0],
				rdbuf[1]);
			return -EIO;
		}
		break;

	case M09:
		wrbuf[0] = addr;
		error = edt_ft5x06_ts_readwrite(tsdata->client, 1,
						wrbuf, 1, rdbuf);
		if (error)
			return error;
		break;

	default:
		return -EINVAL;
	}

	return rdbuf[0];
}

struct edt_ft5x06_attribute {
	struct device_attribute dattr;
	size_t field_offset;
	u8 limit_low;
	u8 limit_high;
	u8 addr_m06;
	u8 addr_m09;
};

#define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09,			\
		_limit_low, _limit_high)				\
	struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = {	\
		.dattr = __ATTR(_field, _mode,				\
				edt_ft5x06_setting_show,		\
				edt_ft5x06_setting_store),		\
		.field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \
		.addr_m06 = _addr_m06,					\
		.addr_m09 = _addr_m09,					\
		.limit_low = _limit_low,				\
		.limit_high = _limit_high,				\
	}

static ssize_t edt_ft5x06_setting_show(struct device *dev,
				       struct device_attribute *dattr,
				       char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
	struct edt_ft5x06_attribute *attr =
			container_of(dattr, struct edt_ft5x06_attribute, dattr);
	u8 *field = (u8 *)tsdata + attr->field_offset;
	int val;
	size_t count = 0;
	int error = 0;
	u8 addr;

	mutex_lock(&tsdata->mutex);

	if (tsdata->factory_mode) {
		error = -EIO;
		goto out;
	}

	switch (tsdata->version) {
	case M06:
		addr = attr->addr_m06;
		break;

	case M09:
		addr = attr->addr_m09;
		break;

	default:
		error = -ENODEV;
		goto out;
	}

	if (addr != NO_REGISTER) {
		val = edt_ft5x06_register_read(tsdata, addr);
		if (val < 0) {
			error = val;
			dev_err(&tsdata->client->dev,
				"Failed to fetch attribute %s, error %d\n",
				dattr->attr.name, error);
			goto out;
		}
	} else {
		val = *field;
	}

	if (val != *field) {
		dev_warn(&tsdata->client->dev,
			 "%s: read (%d) and stored value (%d) differ\n",
			 dattr->attr.name, val, *field);
		*field = val;
	}

	count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
out:
	mutex_unlock(&tsdata->mutex);
	return error ?: count;
}

static ssize_t edt_ft5x06_setting_store(struct device *dev,
					struct device_attribute *dattr,
					const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
	struct edt_ft5x06_attribute *attr =
			container_of(dattr, struct edt_ft5x06_attribute, dattr);
	u8 *field = (u8 *)tsdata + attr->field_offset;
	unsigned int val;
	int error;
	u8 addr;

	mutex_lock(&tsdata->mutex);

	if (tsdata->factory_mode) {
		error = -EIO;
		goto out;
	}

	error = kstrtouint(buf, 0, &val);
	if (error)
		goto out;

	if (val < attr->limit_low || val > attr->limit_high) {
		error = -ERANGE;
		goto out;
	}

	switch (tsdata->version) {
	case M06:
		addr = attr->addr_m06;
		break;

	case M09:
		addr = attr->addr_m09;
		break;

	default:
		error = -ENODEV;
		goto out;
	}

	if (addr != NO_REGISTER) {
		error = edt_ft5x06_register_write(tsdata, addr, val);
		if (error) {
			dev_err(&tsdata->client->dev,
				"Failed to update attribute %s, error: %d\n",
				dattr->attr.name, error);
			goto out;
		}
	}
	*field = val;

out:
	mutex_unlock(&tsdata->mutex);
	return error ?: count;
}

static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
		M09_REGISTER_GAIN, 0, 31);
static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
		M09_REGISTER_OFFSET, 0, 31);
static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
		M09_REGISTER_THRESHOLD, 20, 80);
static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
		NO_REGISTER, 3, 14);

static struct attribute *edt_ft5x06_attrs[] = {
	&edt_ft5x06_attr_gain.dattr.attr,
	&edt_ft5x06_attr_offset.dattr.attr,
	&edt_ft5x06_attr_threshold.dattr.attr,
	&edt_ft5x06_attr_report_rate.dattr.attr,
	NULL
};

static const struct attribute_group edt_ft5x06_attr_group = {
	.attrs = edt_ft5x06_attrs,
};

#ifdef CONFIG_DEBUG_FS
static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
{
	struct i2c_client *client = tsdata->client;
	int retries = EDT_SWITCH_MODE_RETRIES;
	int ret;
	int error;

	disable_irq(client->irq);

	if (!tsdata->raw_buffer) {
		tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
				      sizeof(u16);
		tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
		if (!tsdata->raw_buffer) {
			error = -ENOMEM;
			goto err_out;
		}
	}

	/* mode register is 0x3c when in the work mode */
	if (tsdata->version == M09)
		goto m09_out;

	error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
	if (error) {
		dev_err(&client->dev,
			"failed to switch to factory mode, error %d\n", error);
		goto err_out;
	}

	tsdata->factory_mode = true;
	do {
		mdelay(EDT_SWITCH_MODE_DELAY);
		/* mode register is 0x01 when in factory mode */
		ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
		if (ret == 0x03)
			break;
	} while (--retries > 0);

	if (retries == 0) {
		dev_err(&client->dev, "not in factory mode after %dms.\n",
			EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
		error = -EIO;
		goto err_out;
	}

	return 0;

err_out:
	kfree(tsdata->raw_buffer);
	tsdata->raw_buffer = NULL;
	tsdata->factory_mode = false;
	enable_irq(client->irq);

	return error;

m09_out:
	dev_err(&client->dev, "No factory mode support for M09\n");
	return -EINVAL;

}

static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
{
	struct i2c_client *client = tsdata->client;
	int retries = EDT_SWITCH_MODE_RETRIES;
	struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
	int ret;
	int error;

	/* mode register is 0x01 when in the factory mode */
	error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1);
	if (error) {
		dev_err(&client->dev,
			"failed to switch to work mode, error: %d\n", error);
		return error;
	}

	tsdata->factory_mode = false;

	do {
		mdelay(EDT_SWITCH_MODE_DELAY);
		/* mode register is 0x01 when in factory mode */
		ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
		if (ret == 0x01)
			break;
	} while (--retries > 0);

	if (retries == 0) {
		dev_err(&client->dev, "not in work mode after %dms.\n",
			EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
		tsdata->factory_mode = true;
		return -EIO;
	}

	kfree(tsdata->raw_buffer);
	tsdata->raw_buffer = NULL;

	/* restore parameters */
	edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold,
				  tsdata->threshold);
	edt_ft5x06_register_write(tsdata, reg_addr->reg_gain,
				  tsdata->gain);
	edt_ft5x06_register_write(tsdata, reg_addr->reg_offset,
				  tsdata->offset);
	if (reg_addr->reg_report_rate)
		edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate,
				  tsdata->report_rate);

	enable_irq(client->irq);

	return 0;
}

static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
{
	struct edt_ft5x06_ts_data *tsdata = data;

	*mode = tsdata->factory_mode;

	return 0;
};

static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
{
	struct edt_ft5x06_ts_data *tsdata = data;
	int retval = 0;

	if (mode > 1)
		return -ERANGE;

	mutex_lock(&tsdata->mutex);

	if (mode != tsdata->factory_mode) {
		retval = mode ? edt_ft5x06_factory_mode(tsdata) :
				edt_ft5x06_work_mode(tsdata);
	}

	mutex_unlock(&tsdata->mutex);

	return retval;
};

DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
			edt_ft5x06_debugfs_mode_set, "%llu\n");

static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
				char __user *buf, size_t count, loff_t *off)
{
	struct edt_ft5x06_ts_data *tsdata = file->private_data;
	struct i2c_client *client = tsdata->client;
	int retries  = EDT_RAW_DATA_RETRIES;
	int val, i, error;
	size_t read = 0;
	int colbytes;
	char wrbuf[3];
	u8 *rdbuf;

	if (*off < 0 || *off >= tsdata->raw_bufsize)
		return 0;

	mutex_lock(&tsdata->mutex);

	if (!tsdata->factory_mode || !tsdata->raw_buffer) {
		error = -EIO;
		goto out;
	}

	error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
	if (error) {
		dev_dbg(&client->dev,
			"failed to write 0x08 register, error %d\n", error);
		goto out;
	}

	do {
		usleep_range(EDT_RAW_DATA_DELAY, EDT_RAW_DATA_DELAY + 100);
		val = edt_ft5x06_register_read(tsdata, 0x08);
		if (val < 1)
			break;
	} while (--retries > 0);

	if (val < 0) {
		error = val;
		dev_dbg(&client->dev,
			"failed to read 0x08 register, error %d\n", error);
		goto out;
	}

	if (retries == 0) {
		dev_dbg(&client->dev,
			"timed out waiting for register to settle\n");
		error = -ETIMEDOUT;
		goto out;
	}

	rdbuf = tsdata->raw_buffer;
	colbytes = tsdata->num_y * sizeof(u16);

	wrbuf[0] = 0xf5;
	wrbuf[1] = 0x0e;
	for (i = 0; i < tsdata->num_x; i++) {
		wrbuf[2] = i;  /* column index */
		error = edt_ft5x06_ts_readwrite(tsdata->client,
						sizeof(wrbuf), wrbuf,
						colbytes, rdbuf);
		if (error)
			goto out;

		rdbuf += colbytes;
	}

	read = min_t(size_t, count, tsdata->raw_bufsize - *off);
	if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
		error = -EFAULT;
		goto out;
	}

	*off += read;
out:
	mutex_unlock(&tsdata->mutex);
	return error ?: read;
};

static const struct file_operations debugfs_raw_data_fops = {
	.open = simple_open,
	.read = edt_ft5x06_debugfs_raw_data_read,
};

static void
edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
			      const char *debugfs_name)
{
	tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
	if (!tsdata->debug_dir)
		return;

	debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
	debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);

	debugfs_create_file("mode", S_IRUSR | S_IWUSR,
			    tsdata->debug_dir, tsdata, &debugfs_mode_fops);
	debugfs_create_file("raw_data", S_IRUSR,
			    tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
}

static void
edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
{
	debugfs_remove_recursive(tsdata->debug_dir);
	kfree(tsdata->raw_buffer);
}

#else

static inline void
edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
			      const char *debugfs_name)
{
}

static inline void
edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
{
}

#endif /* CONFIG_DEBUGFS */

static int edt_ft5x06_ts_identify(struct i2c_client *client,
					struct edt_ft5x06_ts_data *tsdata,
					char *fw_version)
{
	u8 rdbuf[EDT_NAME_LEN];
	char *p;
	int error;
	char *model_name = tsdata->name;

	/* see what we find if we assume it is a M06 *
	 * if we get less than EDT_NAME_LEN, we don't want
	 * to have garbage in there
	 */
	memset(rdbuf, 0, sizeof(rdbuf));
	error = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
					EDT_NAME_LEN - 1, rdbuf);
	if (error)
		return error;

	/* if we find something consistent, stay with that assumption
	 * at least M09 won't send 3 bytes here
	 */
	if (!(strncasecmp(rdbuf + 1, "EP0", 3))) {
		tsdata->version = M06;

		/* remove last '$' end marker */
		rdbuf[EDT_NAME_LEN - 1] = '\0';
		if (rdbuf[EDT_NAME_LEN - 2] == '$')
			rdbuf[EDT_NAME_LEN - 2] = '\0';

		/* look for Model/Version separator */
		p = strchr(rdbuf, '*');
		if (p)
			*p++ = '\0';
		strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
		strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
	} else {
		/* since there are only two versions around (M06, M09) */
		tsdata->version = M09;

		error = edt_ft5x06_ts_readwrite(client, 1, "\xA6",
						2, rdbuf);
		if (error)
			return error;

		strlcpy(fw_version, rdbuf, 2);

		error = edt_ft5x06_ts_readwrite(client, 1, "\xA8",
						1, rdbuf);
		if (error)
			return error;

		snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
			rdbuf[0] >> 4, rdbuf[0] & 0x0F);
	}

	return 0;
}

static void edt_ft5x06_ts_get_defaults(struct device *dev,
				       struct edt_ft5x06_ts_data *tsdata)
{
	struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
	u32 val;
	int error;

	error = device_property_read_u32(dev, "threshold", &val);
	if (!error) {
		edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold, val);
		tsdata->threshold = val;
	}

	error = device_property_read_u32(dev, "gain", &val);
	if (!error) {
		edt_ft5x06_register_write(tsdata, reg_addr->reg_gain, val);
		tsdata->gain = val;
	}

	error = device_property_read_u32(dev, "offset", &val);
	if (!error) {
		edt_ft5x06_register_write(tsdata, reg_addr->reg_offset, val);
		tsdata->offset = val;
	}
}

static void
edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
{
	struct edt_reg_addr *reg_addr = &tsdata->reg_addr;

	tsdata->threshold = edt_ft5x06_register_read(tsdata,
						     reg_addr->reg_threshold);
	tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain);
	tsdata->offset = edt_ft5x06_register_read(tsdata, reg_addr->reg_offset);
	if (reg_addr->reg_report_rate != NO_REGISTER)
		tsdata->report_rate = edt_ft5x06_register_read(tsdata,
						reg_addr->reg_report_rate);
	tsdata->num_x = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_x);
	tsdata->num_y = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_y);
}

static void
edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
{
	struct edt_reg_addr *reg_addr = &tsdata->reg_addr;

	switch (tsdata->version) {
	case M06:
		reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
		reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
		reg_addr->reg_gain = WORK_REGISTER_GAIN;
		reg_addr->reg_offset = WORK_REGISTER_OFFSET;
		reg_addr->reg_num_x = WORK_REGISTER_NUM_X;
		reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
		break;

	case M09:
		reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
		reg_addr->reg_gain = M09_REGISTER_GAIN;
		reg_addr->reg_offset = M09_REGISTER_OFFSET;
		reg_addr->reg_num_x = M09_REGISTER_NUM_X;
		reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
		break;
	}
}

static int edt_ft5x06_ts_probe(struct i2c_client *client,
					 const struct i2c_device_id *id)
{
	const struct edt_i2c_chip_data *chip_data;
	struct edt_ft5x06_ts_data *tsdata;
	struct input_dev *input;
	unsigned long irq_flags;
	int error;
	char fw_version[EDT_NAME_LEN];

	dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");

	tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
	if (!tsdata) {
		dev_err(&client->dev, "failed to allocate driver data.\n");
		return -ENOMEM;
	}

	chip_data = of_device_get_match_data(&client->dev);
	if (!chip_data)
		chip_data = (const struct edt_i2c_chip_data *)id->driver_data;
	if (!chip_data || !chip_data->max_support_points) {
		dev_err(&client->dev, "invalid or missing chip data\n");
		return -EINVAL;
	}

	tsdata->max_support_points = chip_data->max_support_points;

	tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
						     "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(tsdata->reset_gpio)) {
		error = PTR_ERR(tsdata->reset_gpio);
		dev_err(&client->dev,
			"Failed to request GPIO reset pin, error %d\n", error);
		return error;
	}

	tsdata->wake_gpio = devm_gpiod_get_optional(&client->dev,
						    "wake", GPIOD_OUT_LOW);
	if (IS_ERR(tsdata->wake_gpio)) {
		error = PTR_ERR(tsdata->wake_gpio);
		dev_err(&client->dev,
			"Failed to request GPIO wake pin, error %d\n", error);
		return error;
	}

	if (tsdata->wake_gpio) {
		usleep_range(5000, 6000);
		gpiod_set_value_cansleep(tsdata->wake_gpio, 1);
	}

	if (tsdata->reset_gpio) {
		usleep_range(5000, 6000);
		gpiod_set_value_cansleep(tsdata->reset_gpio, 0);
		msleep(300);
	}

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

	mutex_init(&tsdata->mutex);
	tsdata->client = client;
	tsdata->input = input;
	tsdata->factory_mode = false;

	error = edt_ft5x06_ts_identify(client, tsdata, fw_version);
	if (error) {
		dev_err(&client->dev, "touchscreen probe failed\n");
		return error;
	}

	edt_ft5x06_ts_set_regs(tsdata);
	edt_ft5x06_ts_get_defaults(&client->dev, tsdata);
	edt_ft5x06_ts_get_parameters(tsdata);

	dev_dbg(&client->dev,
		"Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
		tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);

	input->name = tsdata->name;
	input->id.bustype = BUS_I2C;
	input->dev.parent = &client->dev;

	input_set_abs_params(input, ABS_MT_POSITION_X,
			     0, tsdata->num_x * 64 - 1, 0, 0);
	input_set_abs_params(input, ABS_MT_POSITION_Y,
			     0, tsdata->num_y * 64 - 1, 0, 0);

	touchscreen_parse_properties(input, true, &tsdata->prop);

	error = input_mt_init_slots(input, tsdata->max_support_points,
				INPUT_MT_DIRECT);
	if (error) {
		dev_err(&client->dev, "Unable to init MT slots.\n");
		return error;
	}

	i2c_set_clientdata(client, tsdata);

	irq_flags = irq_get_trigger_type(client->irq);
	if (irq_flags == IRQF_TRIGGER_NONE)
		irq_flags = IRQF_TRIGGER_FALLING;
	irq_flags |= IRQF_ONESHOT;

	error = devm_request_threaded_irq(&client->dev, client->irq,
					NULL, edt_ft5x06_ts_isr, irq_flags,
					client->name, tsdata);
	if (error) {
		dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
		return error;
	}

	error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group);
	if (error)
		return error;

	error = input_register_device(input);
	if (error)
		goto err_remove_attrs;

	edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
	device_init_wakeup(&client->dev, 1);

	dev_dbg(&client->dev,
		"EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
		client->irq,
		tsdata->wake_gpio ? desc_to_gpio(tsdata->wake_gpio) : -1,
		tsdata->reset_gpio ? desc_to_gpio(tsdata->reset_gpio) : -1);

	return 0;

err_remove_attrs:
	sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
	return error;
}

static int edt_ft5x06_ts_remove(struct i2c_client *client)
{
	struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);

	edt_ft5x06_ts_teardown_debugfs(tsdata);
	sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);

	return 0;
}

static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

	if (device_may_wakeup(dev))
		enable_irq_wake(client->irq);

	return 0;
}

static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

	if (device_may_wakeup(dev))
		disable_irq_wake(client->irq);

	return 0;
}

static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
			 edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);

static const struct edt_i2c_chip_data edt_ft5x06_data = {
	.max_support_points = 5,
};

static const struct edt_i2c_chip_data edt_ft5506_data = {
	.max_support_points = 10,
};

static const struct edt_i2c_chip_data edt_ft6236_data = {
	.max_support_points = 2,
};

static const struct i2c_device_id edt_ft5x06_ts_id[] = {
	{ .name = "edt-ft5x06", .driver_data = (long)&edt_ft5x06_data },
	{ .name = "edt-ft5506", .driver_data = (long)&edt_ft5506_data },
	/* Note no edt- prefix for compatibility with the ft6236.c driver */
	{ .name = "ft6236", .driver_data = (long)&edt_ft6236_data },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);

#ifdef CONFIG_OF
static const struct of_device_id edt_ft5x06_of_match[] = {
	{ .compatible = "edt,edt-ft5206", .data = &edt_ft5x06_data },
	{ .compatible = "edt,edt-ft5306", .data = &edt_ft5x06_data },
	{ .compatible = "edt,edt-ft5406", .data = &edt_ft5x06_data },
	{ .compatible = "edt,edt-ft5506", .data = &edt_ft5506_data },
	/* Note focaltech vendor prefix for compatibility with ft6236.c */
	{ .compatible = "focaltech,ft6236", .data = &edt_ft6236_data },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
#endif

static struct i2c_driver edt_ft5x06_ts_driver = {
	.driver = {
		.name = "edt_ft5x06",
		.of_match_table = of_match_ptr(edt_ft5x06_of_match),
		.pm = &edt_ft5x06_ts_pm_ops,
	},
	.id_table = edt_ft5x06_ts_id,
	.probe    = edt_ft5x06_ts_probe,
	.remove   = edt_ft5x06_ts_remove,
};

module_i2c_driver(edt_ft5x06_ts_driver);

MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
MODULE_LICENSE("GPL");