summaryrefslogtreecommitdiffstats
path: root/drivers/input/touchscreen/stmfts.c
blob: 8c6c6178ec12fd26ed9832311419da243ed4c154 (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
/*
 * Copyright (c) 2017 Samsung Electronics Co., Ltd.
 * Author: Andi Shyti <andi.shyti@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * STMicroelectronics FTS Touchscreen device driver
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>

/* I2C commands */
#define STMFTS_READ_INFO			0x80
#define STMFTS_READ_STATUS			0x84
#define STMFTS_READ_ONE_EVENT			0x85
#define STMFTS_READ_ALL_EVENT			0x86
#define STMFTS_LATEST_EVENT			0x87
#define STMFTS_SLEEP_IN				0x90
#define STMFTS_SLEEP_OUT			0x91
#define STMFTS_MS_MT_SENSE_OFF			0x92
#define STMFTS_MS_MT_SENSE_ON			0x93
#define STMFTS_SS_HOVER_SENSE_OFF		0x94
#define STMFTS_SS_HOVER_SENSE_ON		0x95
#define STMFTS_MS_KEY_SENSE_OFF			0x9a
#define STMFTS_MS_KEY_SENSE_ON			0x9b
#define STMFTS_SYSTEM_RESET			0xa0
#define STMFTS_CLEAR_EVENT_STACK		0xa1
#define STMFTS_FULL_FORCE_CALIBRATION		0xa2
#define STMFTS_MS_CX_TUNING			0xa3
#define STMFTS_SS_CX_TUNING			0xa4

/* events */
#define STMFTS_EV_NO_EVENT			0x00
#define STMFTS_EV_MULTI_TOUCH_DETECTED		0x02
#define STMFTS_EV_MULTI_TOUCH_ENTER		0x03
#define STMFTS_EV_MULTI_TOUCH_LEAVE		0x04
#define STMFTS_EV_MULTI_TOUCH_MOTION		0x05
#define STMFTS_EV_HOVER_ENTER			0x07
#define STMFTS_EV_HOVER_LEAVE			0x08
#define STMFTS_EV_HOVER_MOTION			0x09
#define STMFTS_EV_KEY_STATUS			0x0e
#define STMFTS_EV_ERROR				0x0f
#define STMFTS_EV_CONTROLLER_READY		0x10
#define STMFTS_EV_SLEEP_OUT_CONTROLLER_READY	0x11
#define STMFTS_EV_STATUS			0x16
#define STMFTS_EV_DEBUG				0xdb

/* multi touch related event masks */
#define STMFTS_MASK_EVENT_ID			0x0f
#define STMFTS_MASK_TOUCH_ID			0xf0
#define STMFTS_MASK_LEFT_EVENT			0x0f
#define STMFTS_MASK_X_MSB			0x0f
#define STMFTS_MASK_Y_LSB			0xf0

/* key related event masks */
#define STMFTS_MASK_KEY_NO_TOUCH		0x00
#define STMFTS_MASK_KEY_MENU			0x01
#define STMFTS_MASK_KEY_BACK			0x02

#define STMFTS_EVENT_SIZE	8
#define STMFTS_STACK_DEPTH	32
#define STMFTS_DATA_MAX_SIZE	(STMFTS_EVENT_SIZE * STMFTS_STACK_DEPTH)
#define STMFTS_MAX_FINGERS	10
#define STMFTS_DEV_NAME		"stmfts"

enum stmfts_regulators {
	STMFTS_REGULATOR_VDD,
	STMFTS_REGULATOR_AVDD,
};

struct stmfts_data {
	struct i2c_client *client;
	struct input_dev *input;
	struct led_classdev led_cdev;
	struct mutex mutex;

	struct touchscreen_properties prop;

	struct regulator_bulk_data regulators[2];

	/*
	 * Presence of ledvdd will be used also to check
	 * whether the LED is supported.
	 */
	struct regulator *ledvdd;

	u16 chip_id;
	u8 chip_ver;
	u16 fw_ver;
	u8 config_id;
	u8 config_ver;

	u8 data[STMFTS_DATA_MAX_SIZE];

	struct completion cmd_done;

	bool use_key;
	bool led_status;
	bool hover_enabled;
	bool running;
};

static void stmfts_brightness_set(struct led_classdev *led_cdev,
					enum led_brightness value)
{
	struct stmfts_data *sdata = container_of(led_cdev,
					struct stmfts_data, led_cdev);
	int err;

	if (value == sdata->led_status || !sdata->ledvdd)
		return;

	if (!value) {
		regulator_disable(sdata->ledvdd);
	} else {
		err = regulator_enable(sdata->ledvdd);
		if (err)
			dev_warn(&sdata->client->dev,
				 "failed to disable ledvdd regulator: %d\n",
				 err);
	}

	sdata->led_status = value;
}

static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev)
{
	struct stmfts_data *sdata = container_of(led_cdev,
						struct stmfts_data, led_cdev);

	return !!regulator_is_enabled(sdata->ledvdd);
}

/*
 * We can't simply use i2c_smbus_read_i2c_block_data because we
 * need to read more than 255 bytes (
 */
static int stmfts_read_events(struct stmfts_data *sdata)
{
	u8 cmd = STMFTS_READ_ALL_EVENT;
	struct i2c_msg msgs[2] = {
		{
			.addr	= sdata->client->addr,
			.len	= 1,
			.buf	= &cmd,
		},
		{
			.addr	= sdata->client->addr,
			.flags	= I2C_M_RD,
			.len	= STMFTS_DATA_MAX_SIZE,
			.buf	= sdata->data,
		},
	};
	int ret;

	ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs));
	if (ret < 0)
		return ret;

	return ret == ARRAY_SIZE(msgs) ? 0 : -EIO;
}

static void stmfts_report_contact_event(struct stmfts_data *sdata,
					const u8 event[])
{
	u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
	u16 x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8);
	u16 y = (event[2] >> 4) | (event[3] << 4);
	u8 maj = event[4];
	u8 min = event[5];
	u8 orientation = event[6];
	u8 area = event[7];

	input_mt_slot(sdata->input, slot_id);

	input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true);
	input_report_abs(sdata->input, ABS_MT_POSITION_X, x);
	input_report_abs(sdata->input, ABS_MT_POSITION_Y, y);
	input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj);
	input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min);
	input_report_abs(sdata->input, ABS_MT_PRESSURE, area);
	input_report_abs(sdata->input, ABS_MT_ORIENTATION, orientation);

	input_sync(sdata->input);
}

static void stmfts_report_contact_release(struct stmfts_data *sdata,
					  const u8 event[])
{
	u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;

	input_mt_slot(sdata->input, slot_id);
	input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, false);

	input_sync(sdata->input);
}

static void stmfts_report_hover_event(struct stmfts_data *sdata,
				      const u8 event[])
{
	u16 x = (event[2] << 4) | (event[4] >> 4);
	u16 y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB);
	u8 z = event[5];

	input_report_abs(sdata->input, ABS_X, x);
	input_report_abs(sdata->input, ABS_Y, y);
	input_report_abs(sdata->input, ABS_DISTANCE, z);

	input_sync(sdata->input);
}

static void stmfts_report_key_event(struct stmfts_data *sdata, const u8 event[])
{
	switch (event[2]) {
	case 0:
		input_report_key(sdata->input, KEY_BACK, 0);
		input_report_key(sdata->input, KEY_MENU, 0);
		break;

	case STMFTS_MASK_KEY_BACK:
		input_report_key(sdata->input, KEY_BACK, 1);
		break;

	case STMFTS_MASK_KEY_MENU:
		input_report_key(sdata->input, KEY_MENU, 1);
		break;

	default:
		dev_warn(&sdata->client->dev,
			 "unknown key event: %#02x\n", event[2]);
		break;
	}

	input_sync(sdata->input);
}

static void stmfts_parse_events(struct stmfts_data *sdata)
{
	int i;

	for (i = 0; i < STMFTS_STACK_DEPTH; i++) {
		u8 *event = &sdata->data[i * STMFTS_EVENT_SIZE];

		switch (event[0]) {

		case STMFTS_EV_CONTROLLER_READY:
		case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY:
		case STMFTS_EV_STATUS:
			complete(&sdata->cmd_done);
			/* fall through */

		case STMFTS_EV_NO_EVENT:
		case STMFTS_EV_DEBUG:
			return;
		}

		switch (event[0] & STMFTS_MASK_EVENT_ID) {

		case STMFTS_EV_MULTI_TOUCH_ENTER:
		case STMFTS_EV_MULTI_TOUCH_MOTION:
			stmfts_report_contact_event(sdata, event);
			break;

		case STMFTS_EV_MULTI_TOUCH_LEAVE:
			stmfts_report_contact_release(sdata, event);
			break;

		case STMFTS_EV_HOVER_ENTER:
		case STMFTS_EV_HOVER_LEAVE:
		case STMFTS_EV_HOVER_MOTION:
			stmfts_report_hover_event(sdata, event);
			break;

		case STMFTS_EV_KEY_STATUS:
			stmfts_report_key_event(sdata, event);
			break;

		case STMFTS_EV_ERROR:
			dev_warn(&sdata->client->dev,
					"error code: 0x%x%x%x%x%x%x",
					event[6], event[5], event[4],
					event[3], event[2], event[1]);
			break;

		default:
			dev_err(&sdata->client->dev,
				"unknown event %#02x\n", event[0]);
		}
	}
}

static irqreturn_t stmfts_irq_handler(int irq, void *dev)
{
	struct stmfts_data *sdata = dev;
	int err;

	mutex_lock(&sdata->mutex);

	err = stmfts_read_events(sdata);
	if (unlikely(err))
		dev_err(&sdata->client->dev,
			"failed to read events: %d\n", err);
	else
		stmfts_parse_events(sdata);

	mutex_unlock(&sdata->mutex);
	return IRQ_HANDLED;
}

static int stmfts_command(struct stmfts_data *sdata, const u8 cmd)
{
	int err;

	reinit_completion(&sdata->cmd_done);

	err = i2c_smbus_write_byte(sdata->client, cmd);
	if (err)
		return err;

	if (!wait_for_completion_timeout(&sdata->cmd_done,
					 msecs_to_jiffies(1000)))
		return -ETIMEDOUT;

	return 0;
}

static int stmfts_input_open(struct input_dev *dev)
{
	struct stmfts_data *sdata = input_get_drvdata(dev);
	int err;

	err = pm_runtime_get_sync(&sdata->client->dev);
	if (err < 0)
		return err;

	err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON);
	if (err)
		return err;

	mutex_lock(&sdata->mutex);
	sdata->running = true;

	if (sdata->hover_enabled) {
		err = i2c_smbus_write_byte(sdata->client,
					   STMFTS_SS_HOVER_SENSE_ON);
		if (err)
			dev_warn(&sdata->client->dev,
				 "failed to enable hover\n");
	}
	mutex_unlock(&sdata->mutex);

	if (sdata->use_key) {
		err = i2c_smbus_write_byte(sdata->client,
					   STMFTS_MS_KEY_SENSE_ON);
		if (err)
			/* I can still use only the touch screen */
			dev_warn(&sdata->client->dev,
				 "failed to enable touchkey\n");
	}

	return 0;
}

static void stmfts_input_close(struct input_dev *dev)
{
	struct stmfts_data *sdata = input_get_drvdata(dev);
	int err;

	err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF);
	if (err)
		dev_warn(&sdata->client->dev,
			 "failed to disable touchscreen: %d\n", err);

	mutex_lock(&sdata->mutex);

	sdata->running = false;

	if (sdata->hover_enabled) {
		err = i2c_smbus_write_byte(sdata->client,
					   STMFTS_SS_HOVER_SENSE_OFF);
		if (err)
			dev_warn(&sdata->client->dev,
				 "failed to disable hover: %d\n", err);
	}
	mutex_unlock(&sdata->mutex);

	if (sdata->use_key) {
		err = i2c_smbus_write_byte(sdata->client,
					   STMFTS_MS_KEY_SENSE_OFF);
		if (err)
			dev_warn(&sdata->client->dev,
				 "failed to disable touchkey: %d\n", err);
	}

	pm_runtime_put_sync(&sdata->client->dev);
}

static ssize_t stmfts_sysfs_chip_id(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct stmfts_data *sdata = dev_get_drvdata(dev);

	return sprintf(buf, "%#x\n", sdata->chip_id);
}

static ssize_t stmfts_sysfs_chip_version(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct stmfts_data *sdata = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", sdata->chip_ver);
}

static ssize_t stmfts_sysfs_fw_ver(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct stmfts_data *sdata = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", sdata->fw_ver);
}

static ssize_t stmfts_sysfs_config_id(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct stmfts_data *sdata = dev_get_drvdata(dev);

	return sprintf(buf, "%#x\n", sdata->config_id);
}

static ssize_t stmfts_sysfs_config_version(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct stmfts_data *sdata = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", sdata->config_ver);
}

static ssize_t stmfts_sysfs_read_status(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct stmfts_data *sdata = dev_get_drvdata(dev);
	u8 status[4];
	int err;

	err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_STATUS,
					    sizeof(status), status);
	if (err)
		return err;

	return sprintf(buf, "%#02x\n", status[0]);
}

static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct stmfts_data *sdata = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", sdata->hover_enabled);
}

static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t len)
{
	struct stmfts_data *sdata = dev_get_drvdata(dev);
	unsigned long value;
	int err = 0;

	if (kstrtoul(buf, 0, &value))
		return -EINVAL;

	mutex_lock(&sdata->mutex);

	if (value & sdata->hover_enabled)
		goto out;

	if (sdata->running)
		err = i2c_smbus_write_byte(sdata->client,
					   value ? STMFTS_SS_HOVER_SENSE_ON :
						   STMFTS_SS_HOVER_SENSE_OFF);

	if (!err)
		sdata->hover_enabled = !!value;

out:
	mutex_unlock(&sdata->mutex);

	return len;
}

static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL);
static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL);
static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL);
static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL);
static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL);
static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL);
static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read,
					stmfts_sysfs_hover_enable_write);

static struct attribute *stmfts_sysfs_attrs[] = {
	&dev_attr_chip_id.attr,
	&dev_attr_chip_version.attr,
	&dev_attr_fw_ver.attr,
	&dev_attr_config_id.attr,
	&dev_attr_config_version.attr,
	&dev_attr_status.attr,
	&dev_attr_hover_enable.attr,
	NULL
};

static struct attribute_group stmfts_attribute_group = {
	.attrs = stmfts_sysfs_attrs
};

static int stmfts_power_on(struct stmfts_data *sdata)
{
	int err;
	u8 reg[8];

	err = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators),
				    sdata->regulators);
	if (err)
		return err;

	/*
	 * The datasheet does not specify the power on time, but considering
	 * that the reset time is < 10ms, I sleep 20ms to be sure
	 */
	msleep(20);

	err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_INFO,
					    sizeof(reg), reg);
	if (err < 0)
		return err;
	if (err != sizeof(reg))
		return -EIO;

	sdata->chip_id = be16_to_cpup((__be16 *)&reg[6]);
	sdata->chip_ver = reg[0];
	sdata->fw_ver = be16_to_cpup((__be16 *)&reg[2]);
	sdata->config_id = reg[4];
	sdata->config_ver = reg[5];

	enable_irq(sdata->client->irq);

	msleep(50);

	err = stmfts_command(sdata, STMFTS_SYSTEM_RESET);
	if (err)
		return err;

	err = stmfts_command(sdata, STMFTS_SLEEP_OUT);
	if (err)
		return err;

	/* optional tuning */
	err = stmfts_command(sdata, STMFTS_MS_CX_TUNING);
	if (err)
		dev_warn(&sdata->client->dev,
			 "failed to perform mutual auto tune: %d\n", err);

	/* optional tuning */
	err = stmfts_command(sdata, STMFTS_SS_CX_TUNING);
	if (err)
		dev_warn(&sdata->client->dev,
			 "failed to perform self auto tune: %d\n", err);

	err = stmfts_command(sdata, STMFTS_FULL_FORCE_CALIBRATION);
	if (err)
		return err;

	/*
	 * At this point no one is using the touchscreen
	 * and I don't really care about the return value
	 */
	(void) i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);

	return 0;
}

static void stmfts_power_off(void *data)
{
	struct stmfts_data *sdata = data;

	disable_irq(sdata->client->irq);
	regulator_bulk_disable(ARRAY_SIZE(sdata->regulators),
						sdata->regulators);
}

/* This function is void because I don't want to prevent using the touch key
 * only because the LEDs don't get registered
 */
static int stmfts_enable_led(struct stmfts_data *sdata)
{
	int err;

	/* get the regulator for powering the leds on */
	sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd");
	if (IS_ERR(sdata->ledvdd))
		return PTR_ERR(sdata->ledvdd);

	sdata->led_cdev.name = STMFTS_DEV_NAME;
	sdata->led_cdev.max_brightness = LED_ON;
	sdata->led_cdev.brightness = LED_OFF;
	sdata->led_cdev.brightness_set = stmfts_brightness_set;
	sdata->led_cdev.brightness_get = stmfts_brightness_get;

	err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev);
	if (err) {
		devm_regulator_put(sdata->ledvdd);
		return err;
	}

	return 0;
}

static int stmfts_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	int err;
	struct stmfts_data *sdata;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
						I2C_FUNC_SMBUS_BYTE_DATA |
						I2C_FUNC_SMBUS_I2C_BLOCK))
		return -ENODEV;

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

	i2c_set_clientdata(client, sdata);

	sdata->client = client;
	mutex_init(&sdata->mutex);
	init_completion(&sdata->cmd_done);

	sdata->regulators[STMFTS_REGULATOR_VDD].supply = "vdd";
	sdata->regulators[STMFTS_REGULATOR_AVDD].supply = "avdd";
	err = devm_regulator_bulk_get(&client->dev,
				      ARRAY_SIZE(sdata->regulators),
				      sdata->regulators);
	if (err)
		return err;

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

	sdata->input->name = STMFTS_DEV_NAME;
	sdata->input->id.bustype = BUS_I2C;
	sdata->input->open = stmfts_input_open;
	sdata->input->close = stmfts_input_close;

	input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_X);
	input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_Y);
	touchscreen_parse_properties(sdata->input, true, &sdata->prop);

	input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
	input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
	input_set_abs_params(sdata->input, ABS_MT_ORIENTATION, 0, 255, 0, 0);
	input_set_abs_params(sdata->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
	input_set_abs_params(sdata->input, ABS_DISTANCE, 0, 255, 0, 0);

	sdata->use_key = device_property_read_bool(&client->dev,
						   "touch-key-connected");
	if (sdata->use_key) {
		input_set_capability(sdata->input, EV_KEY, KEY_MENU);
		input_set_capability(sdata->input, EV_KEY, KEY_BACK);
	}

	err = input_mt_init_slots(sdata->input,
				  STMFTS_MAX_FINGERS, INPUT_MT_DIRECT);
	if (err)
		return err;

	input_set_drvdata(sdata->input, sdata);

	err = devm_request_threaded_irq(&client->dev, client->irq,
					NULL, stmfts_irq_handler,
					IRQF_ONESHOT,
					"stmfts_irq", sdata);
	if (err)
		return err;

	/* stmfts_power_on expects interrupt to be disabled */
	disable_irq(client->irq);

	dev_dbg(&client->dev, "initializing ST-Microelectronics FTS...\n");

	err = stmfts_power_on(sdata);
	if (err)
		return err;

	err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata);
	if (err)
		return err;

	err = input_register_device(sdata->input);
	if (err)
		return err;

	if (sdata->use_key) {
		err = stmfts_enable_led(sdata);
		if (err) {
			/*
			 * Even if the LEDs have failed to be initialized and
			 * used in the driver, I can still use the device even
			 * without LEDs. The ledvdd regulator pointer will be
			 * used as a flag.
			 */
			dev_warn(&client->dev, "unable to use touchkey leds\n");
			sdata->ledvdd = NULL;
		}
	}

	err = sysfs_create_group(&sdata->client->dev.kobj,
				 &stmfts_attribute_group);
	if (err)
		return err;

	pm_runtime_enable(&client->dev);

	return 0;
}

static int stmfts_remove(struct i2c_client *client)
{
	pm_runtime_disable(&client->dev);
	sysfs_remove_group(&client->dev.kobj, &stmfts_attribute_group);

	return 0;
}

static int __maybe_unused stmfts_runtime_suspend(struct device *dev)
{
	struct stmfts_data *sdata = dev_get_drvdata(dev);
	int ret;

	ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
	if (ret)
		dev_warn(dev, "failed to suspend device: %d\n", ret);

	return ret;
}

static int __maybe_unused stmfts_runtime_resume(struct device *dev)
{
	struct stmfts_data *sdata = dev_get_drvdata(dev);
	int ret;

	ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_OUT);
	if (ret)
		dev_err(dev, "failed to resume device: %d\n", ret);

	return ret;
}

static int __maybe_unused stmfts_suspend(struct device *dev)
{
	struct stmfts_data *sdata = dev_get_drvdata(dev);

	stmfts_power_off(sdata);

	return 0;
}

static int __maybe_unused stmfts_resume(struct device *dev)
{
	struct stmfts_data *sdata = dev_get_drvdata(dev);

	return stmfts_power_on(sdata);
}

static const struct dev_pm_ops stmfts_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume)
	SET_RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL)
};

#ifdef CONFIG_OF
static const struct of_device_id stmfts_of_match[] = {
	{ .compatible = "st,stmfts", },
	{ },
};
MODULE_DEVICE_TABLE(of, stmfts_of_match);
#endif

static const struct i2c_device_id stmfts_id[] = {
	{ "stmfts", 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, stmfts_id);

static struct i2c_driver stmfts_driver = {
	.driver = {
		.name = STMFTS_DEV_NAME,
		.of_match_table = of_match_ptr(stmfts_of_match),
		.pm = &stmfts_pm_ops,
	},
	.probe = stmfts_probe,
	.remove = stmfts_remove,
	.id_table = stmfts_id,
};

module_i2c_driver(stmfts_driver);

MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>");
MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen");
MODULE_LICENSE("GPL v2");