summaryrefslogtreecommitdiffstats
path: root/drivers/input/touchscreen/pixcir_i2c_ts.c
blob: 6cc6b36663ffb188ff97b20714d0d4de39dbb833 (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
/*
 * Driver for Pixcir I2C touchscreen controllers.
 *
 * Copyright (C) 2010-2011 Pixcir, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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 library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/pixcir_ts.h>

struct pixcir_i2c_ts_data {
	struct i2c_client *client;
	struct input_dev *input;
	const struct pixcir_ts_platform_data *chip;
	bool exiting;
};

static void pixcir_ts_poscheck(struct pixcir_i2c_ts_data *data)
{
	struct pixcir_i2c_ts_data *tsdata = data;
	u8 rdbuf[10], wrbuf[1] = { 0 };
	u8 touch;
	int ret;

	ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
	if (ret != sizeof(wrbuf)) {
		dev_err(&tsdata->client->dev,
			"%s: i2c_master_send failed(), ret=%d\n",
			__func__, ret);
		return;
	}

	ret = i2c_master_recv(tsdata->client, rdbuf, sizeof(rdbuf));
	if (ret != sizeof(rdbuf)) {
		dev_err(&tsdata->client->dev,
			"%s: i2c_master_recv failed(), ret=%d\n",
			__func__, ret);
		return;
	}

	touch = rdbuf[0];
	if (touch) {
		u16 posx1 = (rdbuf[3] << 8) | rdbuf[2];
		u16 posy1 = (rdbuf[5] << 8) | rdbuf[4];
		u16 posx2 = (rdbuf[7] << 8) | rdbuf[6];
		u16 posy2 = (rdbuf[9] << 8) | rdbuf[8];

		input_report_key(tsdata->input, BTN_TOUCH, 1);
		input_report_abs(tsdata->input, ABS_X, posx1);
		input_report_abs(tsdata->input, ABS_Y, posy1);

		input_report_abs(tsdata->input, ABS_MT_POSITION_X, posx1);
		input_report_abs(tsdata->input, ABS_MT_POSITION_Y, posy1);
		input_mt_sync(tsdata->input);

		if (touch == 2) {
			input_report_abs(tsdata->input,
					 ABS_MT_POSITION_X, posx2);
			input_report_abs(tsdata->input,
					 ABS_MT_POSITION_Y, posy2);
			input_mt_sync(tsdata->input);
		}
	} else {
		input_report_key(tsdata->input, BTN_TOUCH, 0);
	}

	input_sync(tsdata->input);
}

static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
{
	struct pixcir_i2c_ts_data *tsdata = dev_id;

	while (!tsdata->exiting) {
		pixcir_ts_poscheck(tsdata);

		if (tsdata->chip->attb_read_val())
			break;

		msleep(20);
	}

	return IRQ_HANDLED;
}

#ifdef CONFIG_PM_SLEEP
static int pixcir_i2c_ts_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

	if (device_may_wakeup(&client->dev))
		enable_irq_wake(client->irq);

	return 0;
}

static int pixcir_i2c_ts_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

	if (device_may_wakeup(&client->dev))
		disable_irq_wake(client->irq);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
			 pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);

static int pixcir_i2c_ts_probe(struct i2c_client *client,
					 const struct i2c_device_id *id)
{
	const struct pixcir_ts_platform_data *pdata = client->dev.platform_data;
	struct pixcir_i2c_ts_data *tsdata;
	struct input_dev *input;
	int error;

	if (!pdata) {
		dev_err(&client->dev, "platform data not defined\n");
		return -EINVAL;
	}

	tsdata = kzalloc(sizeof(*tsdata), GFP_KERNEL);
	input = input_allocate_device();
	if (!tsdata || !input) {
		dev_err(&client->dev, "Failed to allocate driver data!\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	tsdata->client = client;
	tsdata->input = input;
	tsdata->chip = pdata;

	input->name = client->name;
	input->id.bustype = BUS_I2C;
	input->dev.parent = &client->dev;

	__set_bit(EV_KEY, input->evbit);
	__set_bit(EV_ABS, input->evbit);
	__set_bit(BTN_TOUCH, input->keybit);
	input_set_abs_params(input, ABS_X, 0, pdata->x_max, 0, 0);
	input_set_abs_params(input, ABS_Y, 0, pdata->y_max, 0, 0);
	input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);

	input_set_drvdata(input, tsdata);

	error = request_threaded_irq(client->irq, NULL, pixcir_ts_isr,
				     IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
				     client->name, tsdata);
	if (error) {
		dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
		goto err_free_mem;
	}

	error = input_register_device(input);
	if (error)
		goto err_free_irq;

	i2c_set_clientdata(client, tsdata);
	device_init_wakeup(&client->dev, 1);

	return 0;

err_free_irq:
	free_irq(client->irq, tsdata);
err_free_mem:
	input_free_device(input);
	kfree(tsdata);
	return error;
}

static int pixcir_i2c_ts_remove(struct i2c_client *client)
{
	struct pixcir_i2c_ts_data *tsdata = i2c_get_clientdata(client);

	device_init_wakeup(&client->dev, 0);

	tsdata->exiting = true;
	mb();
	free_irq(client->irq, tsdata);

	input_unregister_device(tsdata->input);
	kfree(tsdata);

	return 0;
}

static const struct i2c_device_id pixcir_i2c_ts_id[] = {
	{ "pixcir_ts", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);

static struct i2c_driver pixcir_i2c_ts_driver = {
	.driver = {
		.owner	= THIS_MODULE,
		.name	= "pixcir_ts",
		.pm	= &pixcir_dev_pm_ops,
	},
	.probe		= pixcir_i2c_ts_probe,
	.remove		= pixcir_i2c_ts_remove,
	.id_table	= pixcir_i2c_ts_id,
};

module_i2c_driver(pixcir_i2c_ts_driver);

MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
MODULE_LICENSE("GPL");