aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/input/touchscreen/s6sy761.c
blob: 675efa93d4448b556b27bc2e1e0b682273b1d0c3 (plain) (blame)
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
// SPDX-License-Identifier: GPL-2.0
// Samsung S6SY761 Touchscreen device driver
//
// Copyright (c) 2017 Samsung Electronics Co., Ltd.
// Copyright (c) 2017 Andi Shyti <andi.shyti@samsung.com>

#include <asm/unaligned.h>
#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/module.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>

/* commands */
#define S6SY761_SENSE_ON		0x10
#define S6SY761_SENSE_OFF		0x11
#define S6SY761_TOUCH_FUNCTION		0x30 /* R/W for get/set */
#define S6SY761_FIRMWARE_INTEGRITY	0x21
#define S6SY761_PANEL_INFO		0x23
#define S6SY761_DEVICE_ID		0x52
#define S6SY761_BOOT_STATUS		0x55
#define S6SY761_READ_ONE_EVENT		0x60
#define S6SY761_READ_ALL_EVENT		0x61
#define S6SY761_CLEAR_EVENT_STACK	0x62
#define S6SY761_APPLICATION_MODE	0xe4

/* events */
#define S6SY761_EVENT_INFO		0x02
#define S6SY761_EVENT_VENDOR_INFO	0x07

/* info */
#define S6SY761_INFO_BOOT_COMPLETE	0x00

/* firmware status */
#define S6SY761_FW_OK			0x80

/*
 * the functionalities are put as a reference
 * as in the device I am using none of them
 * works therefore not used in this driver yet.
 */
/* touchscreen functionalities */
#define S6SY761_MASK_TOUCH		BIT(0)
#define S6SY761_MASK_HOVER		BIT(1)
#define S6SY761_MASK_COVER		BIT(2)
#define S6SY761_MASK_GLOVE		BIT(3)
#define S6SY761_MASK_STYLUS		BIT(4)
#define S6SY761_MASK_PALM		BIT(5)
#define S6SY761_MASK_WET		BIT(6)
#define S6SY761_MASK_PROXIMITY		BIT(7)

/* boot status (BS) */
#define S6SY761_BS_BOOT_LOADER		0x10
#define S6SY761_BS_APPLICATION		0x20

/* event id */
#define S6SY761_EVENT_ID_COORDINATE	0x00
#define S6SY761_EVENT_ID_STATUS		0x01

/* event register masks */
#define S6SY761_MASK_TOUCH_STATE	0xc0 /* byte 0 */
#define S6SY761_MASK_TID		0x3c
#define S6SY761_MASK_EID		0x03
#define S6SY761_MASK_X			0xf0 /* byte 3 */
#define S6SY761_MASK_Y			0x0f
#define S6SY761_MASK_Z			0x3f /* byte 6 */
#define S6SY761_MASK_LEFT_EVENTS	0x3f /* byte 7 */
#define S6SY761_MASK_TOUCH_TYPE		0xc0 /* MSB in byte 6, LSB in byte 7 */

/* event touch state values */
#define S6SY761_TS_NONE			0x00
#define S6SY761_TS_PRESS		0x01
#define S6SY761_TS_MOVE			0x02
#define S6SY761_TS_RELEASE		0x03

/* application modes */
#define S6SY761_APP_NORMAL		0x0
#define S6SY761_APP_LOW_POWER		0x1
#define S6SY761_APP_TEST		0x2
#define S6SY761_APP_FLASH		0x3
#define S6SY761_APP_SLEEP		0x4

#define S6SY761_EVENT_SIZE		8
#define S6SY761_EVENT_COUNT		32
#define S6SY761_DEVID_SIZE		3
#define S6SY761_PANEL_ID_SIZE		11
#define S6SY761_TS_STATUS_SIZE		5
#define S6SY761_MAX_FINGERS		10

#define S6SY761_DEV_NAME	"s6sy761"

enum s6sy761_regulators {
	S6SY761_REGULATOR_VDD,
	S6SY761_REGULATOR_AVDD,
};

struct s6sy761_data {
	struct i2c_client *client;
	struct regulator_bulk_data regulators[2];
	struct input_dev *input;
	struct touchscreen_properties prop;

	u8 data[S6SY761_EVENT_SIZE * S6SY761_EVENT_COUNT];

	u16 devid;
	u8 tx_channel;
};

/*
 * We can't simply use i2c_smbus_read_i2c_block_data because we
 * need to read more than 255 bytes
 */
static int s6sy761_read_events(struct s6sy761_data *sdata, u16 n_events)
{
	u8 cmd = S6SY761_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	= (n_events * S6SY761_EVENT_SIZE),
			.buf	= sdata->data + S6SY761_EVENT_SIZE,
		},
	};
	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 s6sy761_report_coordinates(struct s6sy761_data *sdata,
				       u8 *event, u8 tid)
{
	u8 major = event[4];
	u8 minor = event[5];
	u8 z = event[6] & S6SY761_MASK_Z;
	u16 x = (event[1] << 3) | ((event[3] & S6SY761_MASK_X) >> 4);
	u16 y = (event[2] << 3) | (event[3] & S6SY761_MASK_Y);

	input_mt_slot(sdata->input, tid);

	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, major);
	input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, minor);
	input_report_abs(sdata->input, ABS_MT_PRESSURE, z);

	input_sync(sdata->input);
}

static void s6sy761_report_release(struct s6sy761_data *sdata,
				   u8 *event, u8 tid)
{
	input_mt_slot(sdata->input, tid);
	input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, false);

	input_sync(sdata->input);
}

static void s6sy761_handle_coordinates(struct s6sy761_data *sdata, u8 *event)
{
	u8 tid;
	u8 touch_state;

	if (unlikely(!(event[0] & S6SY761_MASK_TID)))
		return;

	tid = ((event[0] & S6SY761_MASK_TID) >> 2) - 1;
	touch_state = (event[0] & S6SY761_MASK_TOUCH_STATE) >> 6;

	switch (touch_state) {

	case S6SY761_TS_NONE:
		break;
	case S6SY761_TS_RELEASE:
		s6sy761_report_release(sdata, event, tid);
		break;
	case S6SY761_TS_PRESS:
	case S6SY761_TS_MOVE:
		s6sy761_report_coordinates(sdata, event, tid);
		break;
	}
}

static void s6sy761_handle_events(struct s6sy761_data *sdata, u8 n_events)
{
	int i;

	for (i = 0; i < n_events; i++) {
		u8 *event = &sdata->data[i * S6SY761_EVENT_SIZE];
		u8 event_id = event[0] & S6SY761_MASK_EID;

		if (!event[0])
			return;

		switch (event_id) {

		case S6SY761_EVENT_ID_COORDINATE:
			s6sy761_handle_coordinates(sdata, event);
			break;

		case S6SY761_EVENT_ID_STATUS:
			break;

		default:
			break;
		}
	}
}

static irqreturn_t s6sy761_irq_handler(int irq, void *dev)
{
	struct s6sy761_data *sdata = dev;
	int ret;
	u8 n_events;

	ret = i2c_smbus_read_i2c_block_data(sdata->client,
					    S6SY761_READ_ONE_EVENT,
					    S6SY761_EVENT_SIZE,
					    sdata->data);
	if (ret < 0) {
		dev_err(&sdata->client->dev, "failed to read events\n");
		return IRQ_HANDLED;
	}

	if (!sdata->data[0])
		return IRQ_HANDLED;

	n_events = sdata->data[7] & S6SY761_MASK_LEFT_EVENTS;
	if (unlikely(n_events > S6SY761_EVENT_COUNT - 1))
		return IRQ_HANDLED;

	if (n_events) {
		ret = s6sy761_read_events(sdata, n_events);
		if (ret < 0) {
			dev_err(&sdata->client->dev, "failed to read events\n");
			return IRQ_HANDLED;
		}
	}

	s6sy761_handle_events(sdata, n_events +  1);

	return IRQ_HANDLED;
}

static int s6sy761_input_open(struct input_dev *dev)
{
	struct s6sy761_data *sdata = input_get_drvdata(dev);

	return i2c_smbus_write_byte(sdata->client, S6SY761_SENSE_ON);
}

static void s6sy761_input_close(struct input_dev *dev)
{
	struct s6sy761_data *sdata = input_get_drvdata(dev);
	int ret;

	ret = i2c_smbus_write_byte(sdata->client, S6SY761_SENSE_OFF);
	if (ret)
		dev_err(&sdata->client->dev, "failed to turn off sensing\n");
}

static ssize_t s6sy761_sysfs_devid(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct s6sy761_data *sdata = dev_get_drvdata(dev);

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

static DEVICE_ATTR(devid, 0444, s6sy761_sysfs_devid, NULL);

static struct attribute *s6sy761_sysfs_attrs[] = {
	&dev_attr_devid.attr,
	NULL
};

static struct attribute_group s6sy761_attribute_group = {
	.attrs = s6sy761_sysfs_attrs
};

static int s6sy761_power_on(struct s6sy761_data *sdata)
{
	u8 buffer[S6SY761_EVENT_SIZE];
	u8 event;
	int ret;

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

	msleep(140);

	/* double check whether the touch is functional */
	ret = i2c_smbus_read_i2c_block_data(sdata->client,
					    S6SY761_READ_ONE_EVENT,
					    S6SY761_EVENT_SIZE,
					    buffer);
	if (ret < 0)
		return ret;

	event = (buffer[0] >> 2) & 0xf;

	if ((event != S6SY761_EVENT_INFO &&
	     event != S6SY761_EVENT_VENDOR_INFO) ||
	    buffer[1] != S6SY761_INFO_BOOT_COMPLETE) {
		return -ENODEV;
	}

	ret = i2c_smbus_read_byte_data(sdata->client, S6SY761_BOOT_STATUS);
	if (ret < 0)
		return ret;

	/* for some reasons the device might be stuck in the bootloader */
	if (ret != S6SY761_BS_APPLICATION)
		return -ENODEV;

	/* enable touch functionality */
	ret = i2c_smbus_write_word_data(sdata->client,
					S6SY761_TOUCH_FUNCTION,
					S6SY761_MASK_TOUCH);
	if (ret)
		return ret;

	return 0;
}

static int s6sy761_hw_init(struct s6sy761_data *sdata,
			   unsigned int *max_x, unsigned int *max_y)
{
	u8 buffer[S6SY761_PANEL_ID_SIZE]; /* larger read size */
	int ret;

	ret = s6sy761_power_on(sdata);
	if (ret)
		return ret;

	ret = i2c_smbus_read_i2c_block_data(sdata->client,
					    S6SY761_DEVICE_ID,
					    S6SY761_DEVID_SIZE,
					    buffer);
	if (ret < 0)
		return ret;

	sdata->devid = get_unaligned_be16(buffer + 1);

	ret = i2c_smbus_read_i2c_block_data(sdata->client,
					    S6SY761_PANEL_INFO,
					    S6SY761_PANEL_ID_SIZE,
					    buffer);
	if (ret < 0)
		return ret;

	*max_x = get_unaligned_be16(buffer);
	*max_y = get_unaligned_be16(buffer + 2);

	/* if no tx channels defined, at least keep one */
	sdata->tx_channel = max_t(u8, buffer[8], 1);

	ret = i2c_smbus_read_byte_data(sdata->client,
				       S6SY761_FIRMWARE_INTEGRITY);
	if (ret < 0)
		return ret;
	else if (ret != S6SY761_FW_OK)
		return -ENODEV;

	return 0;
}

static void s6sy761_power_off(void *data)
{
	struct s6sy761_data *sdata = data;

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

static int s6sy761_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct s6sy761_data *sdata;
	unsigned int max_x, max_y;
	int err;

	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;

	sdata->regulators[S6SY761_REGULATOR_VDD].supply = "vdd";
	sdata->regulators[S6SY761_REGULATOR_AVDD].supply = "avdd";
	err = devm_regulator_bulk_get(&client->dev,
				      ARRAY_SIZE(sdata->regulators),
				      sdata->regulators);
	if (err)
		return err;

	err = devm_add_action_or_reset(&client->dev, s6sy761_power_off, sdata);
	if (err)
		return err;

	err = s6sy761_hw_init(sdata, &max_x, &max_y);
	if (err)
		return err;

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

	sdata->input->name = S6SY761_DEV_NAME;
	sdata->input->id.bustype = BUS_I2C;
	sdata->input->open = s6sy761_input_open;
	sdata->input->close = s6sy761_input_close;

	input_set_abs_params(sdata->input, ABS_MT_POSITION_X, 0, max_x, 0, 0);
	input_set_abs_params(sdata->input, ABS_MT_POSITION_Y, 0, max_y, 0, 0);
	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_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_PRESSURE, 0, 255, 0, 0);

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

	if (!input_abs_get_max(sdata->input, ABS_X) ||
	    !input_abs_get_max(sdata->input, ABS_Y)) {
		dev_warn(&client->dev, "the axis have not been set\n");
	}

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

	input_set_drvdata(sdata->input, sdata);

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

	err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
					s6sy761_irq_handler,
					IRQF_TRIGGER_LOW | IRQF_ONESHOT,
					"s6sy761_irq", sdata);
	if (err)
		return err;

	err = devm_device_add_group(&client->dev, &s6sy761_attribute_group);
	if (err)
		return err;

	pm_runtime_enable(&client->dev);

	return 0;
}

static int s6sy761_remove(struct i2c_client *client)
{
	pm_runtime_disable(&client->dev);

	return 0;
}

static int __maybe_unused s6sy761_runtime_suspend(struct device *dev)
{
	struct s6sy761_data *sdata = dev_get_drvdata(dev);

	return i2c_smbus_write_byte_data(sdata->client,
				S6SY761_APPLICATION_MODE, S6SY761_APP_SLEEP);
}

static int __maybe_unused s6sy761_runtime_resume(struct device *dev)
{
	struct s6sy761_data *sdata = dev_get_drvdata(dev);

	return i2c_smbus_write_byte_data(sdata->client,
				S6SY761_APPLICATION_MODE, S6SY761_APP_NORMAL);
}

static int __maybe_unused s6sy761_suspend(struct device *dev)
{
	struct s6sy761_data *sdata = dev_get_drvdata(dev);

	s6sy761_power_off(sdata);

	return 0;
}

static int __maybe_unused s6sy761_resume(struct device *dev)
{
	struct s6sy761_data *sdata = dev_get_drvdata(dev);

	enable_irq(sdata->client->irq);

	return s6sy761_power_on(sdata);
}

static const struct dev_pm_ops s6sy761_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(s6sy761_suspend, s6sy761_resume)
	SET_RUNTIME_PM_OPS(s6sy761_runtime_suspend,
				s6sy761_runtime_resume, NULL)
};

#ifdef CONFIG_OF
static const struct of_device_id s6sy761_of_match[] = {
	{ .compatible = "samsung,s6sy761", },
	{ },
};
MODULE_DEVICE_TABLE(of, s6sy761_of_match);
#endif

static const struct i2c_device_id s6sy761_id[] = {
	{ "s6sy761", 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, s6sy761_id);

static struct i2c_driver s6sy761_driver = {
	.driver = {
		.name = S6SY761_DEV_NAME,
		.of_match_table = of_match_ptr(s6sy761_of_match),
		.pm = &s6sy761_pm_ops,
	},
	.probe = s6sy761_probe,
	.remove = s6sy761_remove,
	.id_table = s6sy761_id,
};

module_i2c_driver(s6sy761_driver);

MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>");
MODULE_DESCRIPTION("Samsung S6SY761 Touch Screen");
MODULE_LICENSE("GPL v2");