aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/input/touchscreen/inexio.c
blob: 192ade0a0fb9cf7424a79069a3def4f103b31e08 (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
/*
 * iNexio serial touchscreen driver
 *
 * Copyright (c) 2008 Richard Lemon
 * Based on the mtouch driver (c) Vojtech Pavlik and Dan Streetman
 *
 */

/*
 * 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.
 */

/*
 * 2008/06/19 Richard Lemon <richard@codelemon.com>
 *   Copied mtouch.c and edited for iNexio protocol
 */

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/init.h>

#define DRIVER_DESC	"iNexio serial touchscreen driver"

MODULE_AUTHOR("Richard Lemon <richard@codelemon.com>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/*
 * Definitions & global arrays.
 */

#define INEXIO_FORMAT_TOUCH_BIT 0x01
#define INEXIO_FORMAT_LENGTH 5
#define INEXIO_RESPONSE_BEGIN_BYTE 0x80

/* todo: check specs for max length of all responses */
#define INEXIO_MAX_LENGTH 16

#define INEXIO_MIN_XC 0
#define INEXIO_MAX_XC 0x3fff
#define INEXIO_MIN_YC 0
#define INEXIO_MAX_YC 0x3fff

#define INEXIO_GET_XC(data) (((data[1])<<7) | data[2])
#define INEXIO_GET_YC(data) (((data[3])<<7) | data[4])
#define INEXIO_GET_TOUCHED(data) (INEXIO_FORMAT_TOUCH_BIT & data[0])

/*
 * Per-touchscreen data.
 */

struct inexio {
	struct input_dev *dev;
	struct serio *serio;
	int idx;
	unsigned char data[INEXIO_MAX_LENGTH];
	char phys[32];
};

static void inexio_process_data(struct inexio *pinexio)
{
	struct input_dev *dev = pinexio->dev;

	if (INEXIO_FORMAT_LENGTH == ++pinexio->idx) {
		input_report_abs(dev, ABS_X, INEXIO_GET_XC(pinexio->data));
		input_report_abs(dev, ABS_Y, INEXIO_GET_YC(pinexio->data));
		input_report_key(dev, BTN_TOUCH, INEXIO_GET_TOUCHED(pinexio->data));
		input_sync(dev);

		pinexio->idx = 0;
	}
}

static irqreturn_t inexio_interrupt(struct serio *serio,
		unsigned char data, unsigned int flags)
{
	struct inexio* pinexio = serio_get_drvdata(serio);

	pinexio->data[pinexio->idx] = data;

	if (INEXIO_RESPONSE_BEGIN_BYTE&pinexio->data[0])
		inexio_process_data(pinexio);
	else
		printk(KERN_DEBUG "inexio.c: unknown/unsynchronized data from device, byte %x\n",pinexio->data[0]);

	return IRQ_HANDLED;
}

/*
 * inexio_disconnect() is the opposite of inexio_connect()
 */

static void inexio_disconnect(struct serio *serio)
{
	struct inexio* pinexio = serio_get_drvdata(serio);

	input_get_device(pinexio->dev);
	input_unregister_device(pinexio->dev);
	serio_close(serio);
	serio_set_drvdata(serio, NULL);
	input_put_device(pinexio->dev);
	kfree(pinexio);
}

/*
 * inexio_connect() is the routine that is called when someone adds a
 * new serio device that supports iNexio protocol and registers it as
 * an input device. This is usually accomplished using inputattach.
 */

static int inexio_connect(struct serio *serio, struct serio_driver *drv)
{
	struct inexio *pinexio;
	struct input_dev *input_dev;
	int err;

	pinexio = kzalloc(sizeof(struct inexio), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!pinexio || !input_dev) {
		err = -ENOMEM;
		goto fail1;
	}

	pinexio->serio = serio;
	pinexio->dev = input_dev;
	snprintf(pinexio->phys, sizeof(pinexio->phys), "%s/input0", serio->phys);

	input_dev->name = "iNexio Serial TouchScreen";
	input_dev->phys = pinexio->phys;
	input_dev->id.bustype = BUS_RS232;
	input_dev->id.vendor = SERIO_INEXIO;
	input_dev->id.product = 0;
	input_dev->id.version = 0x0001;
	input_dev->dev.parent = &serio->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(pinexio->dev, ABS_X, INEXIO_MIN_XC, INEXIO_MAX_XC, 0, 0);
	input_set_abs_params(pinexio->dev, ABS_Y, INEXIO_MIN_YC, INEXIO_MAX_YC, 0, 0);

	serio_set_drvdata(serio, pinexio);

	err = serio_open(serio, drv);
	if (err)
		goto fail2;

	err = input_register_device(pinexio->dev);
	if (err)
		goto fail3;

	return 0;

 fail3:	serio_close(serio);
 fail2:	serio_set_drvdata(serio, NULL);
 fail1:	input_free_device(input_dev);
	kfree(pinexio);
	return err;
}

/*
 * The serio driver structure.
 */

static struct serio_device_id inexio_serio_ids[] = {
	{
		.type	= SERIO_RS232,
		.proto	= SERIO_INEXIO,
		.id	= SERIO_ANY,
		.extra	= SERIO_ANY,
	},
	{ 0 }
};

MODULE_DEVICE_TABLE(serio, inexio_serio_ids);

static struct serio_driver inexio_drv = {
	.driver		= {
		.name	= "inexio",
	},
	.description	= DRIVER_DESC,
	.id_table	= inexio_serio_ids,
	.interrupt	= inexio_interrupt,
	.connect	= inexio_connect,
	.disconnect	= inexio_disconnect,
};

/*
 * The functions for inserting/removing us as a module.
 */

static int __init inexio_init(void)
{
	return serio_register_driver(&inexio_drv);
}

static void __exit inexio_exit(void)
{
	serio_unregister_driver(&inexio_drv);
}

module_init(inexio_init);
module_exit(inexio_exit);