aboutsummaryrefslogtreecommitdiff
path: root/drivers/input/touchscreen/cy8ctmg110_ts.c
blob: 4eb7df0b7f875e317bc933cee87713d0dd6af462 (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
/*
 * Driver for cypress touch screen controller
 *
 * Copyright (c) 2009 Aava Mobile
 *
 * Some cleanups by Alan Cox <alan@linux.intel.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.
 *
 * 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 program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/input/cy8ctmg110_pdata.h>

#define CY8CTMG110_DRIVER_NAME      "cy8ctmg110"

/* Touch coordinates */
#define CY8CTMG110_X_MIN		0
#define CY8CTMG110_Y_MIN		0
#define CY8CTMG110_X_MAX		759
#define CY8CTMG110_Y_MAX		465


/* cy8ctmg110 register definitions */
#define CY8CTMG110_TOUCH_WAKEUP_TIME	0
#define CY8CTMG110_TOUCH_SLEEP_TIME	2
#define CY8CTMG110_TOUCH_X1		3
#define CY8CTMG110_TOUCH_Y1		5
#define CY8CTMG110_TOUCH_X2		7
#define CY8CTMG110_TOUCH_Y2		9
#define CY8CTMG110_FINGERS		11
#define CY8CTMG110_GESTURE		12
#define CY8CTMG110_REG_MAX		13


/*
 * The touch driver structure.
 */
struct cy8ctmg110 {
	struct input_dev *input;
	char phys[32];
	struct i2c_client *client;
	int reset_pin;
	int irq_pin;
};

/*
 * cy8ctmg110_power is the routine that is called when touch hardware
 * will powered off or on.
 */
static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
{
	if (ts->reset_pin)
		gpio_direction_output(ts->reset_pin, 1 - poweron);
}

static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
		unsigned char len, unsigned char *value)
{
	struct i2c_client *client = tsc->client;
	unsigned int ret;
	unsigned char i2c_data[6];

	BUG_ON(len > 5);

	i2c_data[0] = reg;
	memcpy(i2c_data + 1, value, len);

	ret = i2c_master_send(client, i2c_data, len + 1);
	if (ret != 1) {
		dev_err(&client->dev, "i2c write data cmd failed\n");
		return ret;
	}

	return 0;
}

static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
		unsigned char *data, unsigned char len, unsigned char cmd)
{
	struct i2c_client *client = tsc->client;
	unsigned int ret;
	struct i2c_msg msg[2] = {
		/* first write slave position to i2c devices */
		{ client->addr, 0, 1, &cmd },
		/* Second read data from position */
		{ client->addr, I2C_M_RD, len, data }
	};

	ret = i2c_transfer(client->adapter, msg, 2);
	if (ret < 0)
		return ret;

	return 0;
}

static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
{
	struct input_dev *input = tsc->input;
	unsigned char reg_p[CY8CTMG110_REG_MAX];
	int x, y;

	memset(reg_p, 0, CY8CTMG110_REG_MAX);

	/* Reading coordinates */
	if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
		return -EIO;

	y = reg_p[2] << 8 | reg_p[3];
	x = reg_p[0] << 8 | reg_p[1];

	/* Number of touch */
	if (reg_p[8] == 0) {
		input_report_key(input, BTN_TOUCH, 0);
	} else  {
		input_report_key(input, BTN_TOUCH, 1);
		input_report_abs(input, ABS_X, x);
		input_report_abs(input, ABS_Y, y);
	}

	input_sync(input);

	return 0;
}

static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
{
	unsigned char reg_p[3];

	if (sleep) {
		reg_p[0] = 0x00;
		reg_p[1] = 0xff;
		reg_p[2] = 5;
	} else {
		reg_p[0] = 0x10;
		reg_p[1] = 0xff;
		reg_p[2] = 0;
	}

	return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
}

static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
{
	struct cy8ctmg110 *tsc = dev_id;

	cy8ctmg110_touch_pos(tsc);

	return IRQ_HANDLED;
}

static int __devinit cy8ctmg110_probe(struct i2c_client *client,
					const struct i2c_device_id *id)
{
	const struct cy8ctmg110_pdata *pdata = client->dev.platform_data;
	struct cy8ctmg110 *ts;
	struct input_dev *input_dev;
	int err;

	/* No pdata no way forward */
	if (pdata == NULL) {
		dev_err(&client->dev, "no pdata\n");
		return -ENODEV;
	}

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

	ts = kzalloc(sizeof(struct cy8ctmg110), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!ts || !input_dev) {
		err = -ENOMEM;
		goto err_free_mem;
	}

	ts->client = client;
	ts->input = input_dev;

	snprintf(ts->phys, sizeof(ts->phys),
		 "%s/input0", dev_name(&client->dev));

	input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
	input_dev->phys = ts->phys;
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = &client->dev;

	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

	input_set_abs_params(input_dev, ABS_X,
			CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 0, 0);
	input_set_abs_params(input_dev, ABS_Y,
			CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 0, 0);

	if (ts->reset_pin) {
		err = gpio_request(ts->reset_pin, NULL);
		if (err) {
			dev_err(&client->dev,
				"Unable to request GPIO pin %d.\n",
				ts->reset_pin);
			goto err_free_mem;
		}
	}

	cy8ctmg110_power(ts, true);
	cy8ctmg110_set_sleepmode(ts, false);

	err = gpio_request(ts->irq_pin, "touch_irq_key");
	if (err < 0) {
		dev_err(&client->dev,
			"Failed to request GPIO %d, error %d\n",
			ts->irq_pin, err);
		goto err_shutoff_device;
	}

	err = gpio_direction_input(ts->irq_pin);
	if (err < 0) {
		dev_err(&client->dev,
			"Failed to configure input direction for GPIO %d, error %d\n",
			ts->irq_pin, err);
		goto err_free_irq_gpio;
	}

	client->irq = gpio_to_irq(ts->irq_pin);
	if (client->irq < 0) {
		err = client->irq;
		dev_err(&client->dev,
			"Unable to get irq number for GPIO %d, error %d\n",
			ts->irq_pin, err);
		goto err_free_irq_gpio;
	}

	err = request_threaded_irq(client->irq, NULL, cy8ctmg110_irq_thread,
				   IRQF_TRIGGER_RISING, "touch_reset_key", ts);
	if (err < 0) {
		dev_err(&client->dev,
			"irq %d busy? error %d\n", client->irq, err);
		goto err_free_irq_gpio;
	}

	err = input_register_device(input_dev);
	if (err)
		goto err_free_irq;

	i2c_set_clientdata(client, ts);
	device_init_wakeup(&client->dev, 1);
	return 0;

err_free_irq:
	free_irq(client->irq, ts);
err_free_irq_gpio:
	gpio_free(ts->irq_pin);
err_shutoff_device:
	cy8ctmg110_set_sleepmode(ts, true);
	cy8ctmg110_power(ts, false);
	if (ts->reset_pin)
		gpio_free(ts->reset_pin);
err_free_mem:
	input_free_device(input_dev);
	kfree(ts);
	return err;
}

#ifdef CONFIG_PM
static int cy8ctmg110_suspend(struct i2c_client *client, pm_message_t mesg)
{
	struct cy8ctmg110 *ts = i2c_get_clientdata(client);

	if (device_may_wakeup(&client->dev))
		enable_irq_wake(client->irq);
	else {
		cy8ctmg110_set_sleepmode(ts, true);
		cy8ctmg110_power(ts, false);
	}
	return 0;
}

static int cy8ctmg110_resume(struct i2c_client *client)
{
	struct cy8ctmg110 *ts = i2c_get_clientdata(client);

	if (device_may_wakeup(&client->dev))
		disable_irq_wake(client->irq);
	else {
		cy8ctmg110_power(ts, true);
		cy8ctmg110_set_sleepmode(ts, false);
	}
	return 0;
}
#endif

static int __devexit cy8ctmg110_remove(struct i2c_client *client)
{
	struct cy8ctmg110 *ts = i2c_get_clientdata(client);

	cy8ctmg110_set_sleepmode(ts, true);
	cy8ctmg110_power(ts, false);

	free_irq(client->irq, ts);
	input_unregister_device(ts->input);
	gpio_free(ts->irq_pin);
	if (ts->reset_pin)
		gpio_free(ts->reset_pin);
	kfree(ts);

	return 0;
}

static struct i2c_device_id cy8ctmg110_idtable[] = {
	{ CY8CTMG110_DRIVER_NAME, 1 },
	{ }
};

MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);

static struct i2c_driver cy8ctmg110_driver = {
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= CY8CTMG110_DRIVER_NAME,
	},
	.id_table	= cy8ctmg110_idtable,
	.probe		= cy8ctmg110_probe,
	.remove		= __devexit_p(cy8ctmg110_remove),
#ifdef CONFIG_PM
	.suspend	= cy8ctmg110_suspend,
	.resume		= cy8ctmg110_resume,
#endif
};

static int __init cy8ctmg110_init(void)
{
	return i2c_add_driver(&cy8ctmg110_driver);
}

static void __exit cy8ctmg110_exit(void)
{
	i2c_del_driver(&cy8ctmg110_driver);
}

module_init(cy8ctmg110_init);
module_exit(cy8ctmg110_exit);

MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
MODULE_LICENSE("GPL v2");