summaryrefslogtreecommitdiffstats
path: root/drivers/input/touchscreen/goodix.c
blob: e36162b28c2aae268166c2e735e318b793b9dfa8 (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
/*
 *  Driver for Goodix Touchscreens
 *
 *  Copyright (c) 2014 Red Hat Inc.
 *
 *  This code is based on gt9xx.c authored by andrew@goodix.com:
 *
 *  2010 - 2012 Goodix Technology.
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; version 2 of the License.
 */

#include <linux/kernel.h>
#include <linux/dmi.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/of.h>
#include <asm/unaligned.h>

struct goodix_ts_data {
	struct i2c_client *client;
	struct input_dev *input_dev;
	int abs_x_max;
	int abs_y_max;
	unsigned int max_touch_num;
	unsigned int int_trigger_type;
	bool rotated_screen;
};

#define GOODIX_MAX_HEIGHT		4096
#define GOODIX_MAX_WIDTH		4096
#define GOODIX_INT_TRIGGER		1
#define GOODIX_CONTACT_SIZE		8
#define GOODIX_MAX_CONTACTS		10

#define GOODIX_CONFIG_MAX_LENGTH	240

/* Register defines */
#define GOODIX_READ_COOR_ADDR		0x814E
#define GOODIX_REG_CONFIG_DATA		0x8047
#define GOODIX_REG_ID			0x8140

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

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

/*
 * Those tablets have their coordinates origin at the bottom right
 * of the tablet, as if rotated 180 degrees
 */
static const struct dmi_system_id rotated_screen[] = {
#if defined(CONFIG_DMI) && defined(CONFIG_X86)
	{
		.ident = "WinBook TW100",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
			DMI_MATCH(DMI_PRODUCT_NAME, "TW100")
		}
	},
	{
		.ident = "WinBook TW700",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
			DMI_MATCH(DMI_PRODUCT_NAME, "TW700")
		},
	},
#endif
	{}
};

/**
 * 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];
	u16 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);
}

static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data)
{
	int touch_num;
	int error;

	error = goodix_i2c_read(ts->client, GOODIX_READ_COOR_ADDR, data,
				GOODIX_CONTACT_SIZE + 1);
	if (error) {
		dev_err(&ts->client->dev, "I2C transfer error: %d\n", error);
		return error;
	}

	if (!(data[0] & 0x80))
		return -EAGAIN;

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

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

	return touch_num;
}

static void goodix_ts_report_touch(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]);

	if (ts->rotated_screen) {
		input_x = ts->abs_x_max - input_x;
		input_y = ts->abs_y_max - input_y;
	}

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

/**
 * 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[1 + GOODIX_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;

	for (i = 0; i < touch_num; i++)
		goodix_ts_report_touch(ts,
				&point_data[1 + GOODIX_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)
{
	static const u8 end_cmd[] = {
		GOODIX_READ_COOR_ADDR >> 8,
		GOODIX_READ_COOR_ADDR & 0xff,
		0
	};
	struct goodix_ts_data *ts = dev_id;

	goodix_process_events(ts);

	if (i2c_master_send(ts->client, end_cmd, sizeof(end_cmd)) < 0)
		dev_err(&ts->client->dev, "I2C write end_cmd error\n");

	return IRQ_HANDLED;
}

/**
 * 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)
{
	u8 config[GOODIX_CONFIG_MAX_LENGTH];
	int error;

	error = goodix_i2c_read(ts->client, GOODIX_REG_CONFIG_DATA,
				config,
				GOODIX_CONFIG_MAX_LENGTH);
	if (error) {
		dev_warn(&ts->client->dev,
			 "Error reading config (%d), using defaults\n",
			 error);
		ts->abs_x_max = GOODIX_MAX_WIDTH;
		ts->abs_y_max = GOODIX_MAX_HEIGHT;
		ts->int_trigger_type = GOODIX_INT_TRIGGER;
		ts->max_touch_num = GOODIX_MAX_CONTACTS;
		return;
	}

	ts->abs_x_max = get_unaligned_le16(&config[RESOLUTION_LOC]);
	ts->abs_y_max = get_unaligned_le16(&config[RESOLUTION_LOC + 2]);
	ts->int_trigger_type = config[TRIGGER_LOC] & 0x03;
	ts->max_touch_num = config[MAX_CONTACTS_LOC] & 0x0f;
	if (!ts->abs_x_max || !ts->abs_y_max || !ts->max_touch_num) {
		dev_err(&ts->client->dev,
			"Invalid config, using defaults\n");
		ts->abs_x_max = GOODIX_MAX_WIDTH;
		ts->abs_y_max = GOODIX_MAX_HEIGHT;
		ts->max_touch_num = GOODIX_MAX_CONTACTS;
	}

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

/**
 * goodix_read_version - Read goodix touchscreen version
 *
 * @client: the i2c client
 * @version: output buffer containing the version on success
 * @id: output buffer containing the id on success
 */
static int goodix_read_version(struct i2c_client *client, u16 *version, u16 *id)
{
	int error;
	u8 buf[6];
	char id_str[5];

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

	memcpy(id_str, buf, 4);
	id_str[4] = 0;
	if (kstrtou16(id_str, 10, id))
		*id = 0x1001;

	*version = get_unaligned_le16(&buf[4]);

	dev_info(&client->dev, "ID %d, version: %04x\n", *id, *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_CONFIG_DATA,
					&test, 1);
		if (!error)
			return 0;

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

	return error;
}

/**
 * goodix_request_input_dev - Allocate, populate and register the input device
 *
 * @ts: our goodix_ts_data pointer
 * @version: device firmware version
 * @id: device ID
 *
 * Must be called during probe
 */
static int goodix_request_input_dev(struct goodix_ts_data *ts, u16 version,
				    u16 id)
{
	int error;

	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;
	}

	input_set_abs_params(ts->input_dev, ABS_MT_POSITION_X,
			     0, ts->abs_x_max, 0, 0);
	input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y,
			     0, ts->abs_y_max, 0, 0);
	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);

	input_mt_init_slots(ts->input_dev, ts->max_touch_num,
			    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);

	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;
	ts->input_dev->id.product = id;
	ts->input_dev->id.version = version;

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

	return 0;
}

static int goodix_ts_probe(struct i2c_client *client,
			   const struct i2c_device_id *id)
{
	struct goodix_ts_data *ts;
	unsigned long irq_flags;
	int error;
	u16 version_info, id_info;

	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);

	error = goodix_i2c_test(client);
	if (error) {
		dev_err(&client->dev, "I2C communication failure: %d\n", error);
		return error;
	}

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

	goodix_read_config(ts);

	error = goodix_request_input_dev(ts, version_info, id_info);
	if (error)
		return error;

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

	return 0;
}

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

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

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

static struct i2c_driver goodix_ts_driver = {
	.probe = goodix_ts_probe,
	.id_table = goodix_ts_id,
	.driver = {
		.name = "Goodix-TS",
		.owner = THIS_MODULE,
		.acpi_match_table = ACPI_PTR(goodix_acpi_match),
		.of_match_table = of_match_ptr(goodix_of_match),
	},
};
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");
OpenPOWER on IntegriCloud