summaryrefslogtreecommitdiffstats
path: root/drivers/input/touchscreen/sx8654.c
blob: aecb9ad2e7016885cda6ee2a7c08af1e461c9980 (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
/*
 * Driver for Semtech SX8654 I2C touchscreen controller.
 *
 * Copyright (c) 2015 Armadeus Systems
 *	Sébastien Szymanski <sebastien.szymanski@armadeus.com>
 *
 * Using code from:
 *  - sx865x.c
 *	Copyright (c) 2013 U-MoBo Srl
 *	Pierluigi Passaro <p.passaro@u-mobo.com>
 *  - sx8650.c
 *      Copyright (c) 2009 Wayne Roberts
 *  - tsc2007.c
 *      Copyright (c) 2008 Kwangwoo Lee
 *  - ads7846.c
 *      Copyright (c) 2005 David Brownell
 *      Copyright (c) 2006 Nokia Corporation
 *  - corgi_ts.c
 *      Copyright (C) 2004-2005 Richard Purdie
 *  - omap_ts.[hc], ads7846.h, ts_osk.c
 *      Copyright (C) 2002 MontaVista Software
 *      Copyright (C) 2004 Texas Instruments
 *      Copyright (C) 2005 Dirk Behme
 *
 *  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.
 */

#include <linux/input.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/irq.h>

/* register addresses */
#define I2C_REG_TOUCH0			0x00
#define I2C_REG_TOUCH1			0x01
#define I2C_REG_CHANMASK		0x04
#define I2C_REG_IRQMASK			0x22
#define I2C_REG_IRQSRC			0x23
#define I2C_REG_SOFTRESET		0x3f

/* commands */
#define CMD_READ_REGISTER		0x40
#define CMD_MANUAL			0xc0
#define CMD_PENTRG			0xe0

/* value for I2C_REG_SOFTRESET */
#define SOFTRESET_VALUE			0xde

/* bits for I2C_REG_IRQSRC */
#define IRQ_PENTOUCH_TOUCHCONVDONE	0x08
#define IRQ_PENRELEASE			0x04

/* bits for RegTouch1 */
#define CONDIRQ				0x20
#define FILT_7SA			0x03

/* bits for I2C_REG_CHANMASK */
#define CONV_X				0x80
#define CONV_Y				0x40

/* coordinates rate: higher nibble of CTRL0 register */
#define RATE_MANUAL			0x00
#define RATE_5000CPS			0xf0

/* power delay: lower nibble of CTRL0 register */
#define POWDLY_1_1MS			0x0b

#define MAX_12BIT			((1 << 12) - 1)

struct sx8654 {
	struct input_dev *input;
	struct i2c_client *client;
};

static irqreturn_t sx8654_irq(int irq, void *handle)
{
	struct sx8654 *sx8654 = handle;
	int irqsrc;
	u8 data[4];
	unsigned int x, y;
	int retval;

	irqsrc = i2c_smbus_read_byte_data(sx8654->client,
					  CMD_READ_REGISTER | I2C_REG_IRQSRC);
	dev_dbg(&sx8654->client->dev, "irqsrc = 0x%x", irqsrc);

	if (irqsrc < 0)
		goto out;

	if (irqsrc & IRQ_PENRELEASE) {
		dev_dbg(&sx8654->client->dev, "pen release interrupt");

		input_report_key(sx8654->input, BTN_TOUCH, 0);
		input_sync(sx8654->input);
	}

	if (irqsrc & IRQ_PENTOUCH_TOUCHCONVDONE) {
		dev_dbg(&sx8654->client->dev, "pen touch interrupt");

		retval = i2c_master_recv(sx8654->client, data, sizeof(data));
		if (retval != sizeof(data))
			goto out;

		/* invalid data */
		if (unlikely(data[0] & 0x80 || data[2] & 0x80))
			goto out;

		x = ((data[0] & 0xf) << 8) | (data[1]);
		y = ((data[2] & 0xf) << 8) | (data[3]);

		input_report_abs(sx8654->input, ABS_X, x);
		input_report_abs(sx8654->input, ABS_Y, y);
		input_report_key(sx8654->input, BTN_TOUCH, 1);
		input_sync(sx8654->input);

		dev_dbg(&sx8654->client->dev, "point(%4d,%4d)\n", x, y);
	}

out:
	return IRQ_HANDLED;
}

static int sx8654_open(struct input_dev *dev)
{
	struct sx8654 *sx8654 = input_get_drvdata(dev);
	struct i2c_client *client = sx8654->client;
	int error;

	/* enable pen trigger mode */
	error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0,
					  RATE_5000CPS | POWDLY_1_1MS);
	if (error) {
		dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
		return error;
	}

	error = i2c_smbus_write_byte(client, CMD_PENTRG);
	if (error) {
		dev_err(&client->dev, "writing command CMD_PENTRG failed");
		return error;
	}

	enable_irq(client->irq);

	return 0;
}

static void sx8654_close(struct input_dev *dev)
{
	struct sx8654 *sx8654 = input_get_drvdata(dev);
	struct i2c_client *client = sx8654->client;
	int error;

	disable_irq(client->irq);

	/* enable manual mode mode */
	error = i2c_smbus_write_byte(client, CMD_MANUAL);
	if (error) {
		dev_err(&client->dev, "writing command CMD_MANUAL failed");
		return;
	}

	error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, 0);
	if (error) {
		dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
		return;
	}
}

static int sx8654_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct sx8654 *sx8654;
	struct input_dev *input;
	int error;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_READ_WORD_DATA))
		return -ENXIO;

	sx8654 = devm_kzalloc(&client->dev, sizeof(*sx8654), GFP_KERNEL);
	if (!sx8654)
		return -ENOMEM;

	input = devm_input_allocate_device(&client->dev);
	if (!sx8654)
		return -ENOMEM;

	input->name = "SX8654 I2C Touchscreen";
	input->id.bustype = BUS_I2C;
	input->dev.parent = &client->dev;
	input->open = sx8654_open;
	input->close = sx8654_close;

	__set_bit(INPUT_PROP_DIRECT, input->propbit);
	input_set_capability(input, EV_KEY, BTN_TOUCH);
	input_set_abs_params(input, ABS_X, 0, MAX_12BIT, 0, 0);
	input_set_abs_params(input, ABS_Y, 0, MAX_12BIT, 0, 0);

	sx8654->client = client;
	sx8654->input = input;

	input_set_drvdata(sx8654->input, sx8654);

	error = i2c_smbus_write_byte_data(client, I2C_REG_SOFTRESET,
					  SOFTRESET_VALUE);
	if (error) {
		dev_err(&client->dev, "writing softreset value failed");
		return error;
	}

	error = i2c_smbus_write_byte_data(client, I2C_REG_CHANMASK,
					  CONV_X | CONV_Y);
	if (error) {
		dev_err(&client->dev, "writing to I2C_REG_CHANMASK failed");
		return error;
	}

	error = i2c_smbus_write_byte_data(client, I2C_REG_IRQMASK,
					  IRQ_PENTOUCH_TOUCHCONVDONE |
						IRQ_PENRELEASE);
	if (error) {
		dev_err(&client->dev, "writing to I2C_REG_IRQMASK failed");
		return error;
	}

	error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH1,
					  CONDIRQ | FILT_7SA);
	if (error) {
		dev_err(&client->dev, "writing to I2C_REG_TOUCH1 failed");
		return error;
	}

	error = devm_request_threaded_irq(&client->dev, client->irq,
					  NULL, sx8654_irq,
					  IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
					  client->name, sx8654);
	if (error) {
		dev_err(&client->dev,
			"Failed to enable IRQ %d, error: %d\n",
			client->irq, error);
		return error;
	}

	/* Disable the IRQ, we'll enable it in sx8654_open() */
	disable_irq(client->irq);

	error = input_register_device(sx8654->input);
	if (error)
		return error;

	i2c_set_clientdata(client, sx8654);
	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id sx8654_of_match[] = {
	{ .compatible = "semtech,sx8654", },
	{ },
};
MODULE_DEVICE_TABLE(of, sx8654_of_match);
#endif

static const struct i2c_device_id sx8654_id_table[] = {
	{ "semtech_sx8654", 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, sx8654_id_table);

static struct i2c_driver sx8654_driver = {
	.driver = {
		.name = "sx8654",
		.of_match_table = of_match_ptr(sx8654_of_match),
	},
	.id_table = sx8654_id_table,
	.probe = sx8654_probe,
};
module_i2c_driver(sx8654_driver);

MODULE_AUTHOR("Sébastien Szymanski <sebastien.szymanski@armadeus.com>");
MODULE_DESCRIPTION("Semtech SX8654 I2C Touchscreen Driver");
MODULE_LICENSE("GPL");