gunze.c
4.57 KB
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
/*
* Copyright (c) 2000-2001 Vojtech Pavlik
*/
/*
* Gunze AHL-51S touchscreen driver for Linux
*/
/*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
*/
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/serio.h>
#define DRIVER_DESC "Gunze AHL-51S touchscreen driver"
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
/*
* Definitions & global arrays.
*/
#define GUNZE_MAX_LENGTH 10
/*
* Per-touchscreen data.
*/
struct gunze {
struct input_dev *dev;
struct serio *serio;
int idx;
unsigned char data[GUNZE_MAX_LENGTH];
char phys[32];
};
static void gunze_process_packet(struct gunze* gunze)
{
struct input_dev *dev = gunze->dev;
if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||
(gunze->data[0] != 'T' && gunze->data[0] != 'R')) {
printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);
return;
}
input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
input_sync(dev);
}
static irqreturn_t gunze_interrupt(struct serio *serio,
unsigned char data, unsigned int flags)
{
struct gunze* gunze = serio_get_drvdata(serio);
if (data == '\r') {
gunze_process_packet(gunze);
gunze->idx = 0;
} else {
if (gunze->idx < GUNZE_MAX_LENGTH)
gunze->data[gunze->idx++] = data;
}
return IRQ_HANDLED;
}
/*
* gunze_disconnect() is the opposite of gunze_connect()
*/
static void gunze_disconnect(struct serio *serio)
{
struct gunze *gunze = serio_get_drvdata(serio);
input_get_device(gunze->dev);
input_unregister_device(gunze->dev);
serio_close(serio);
serio_set_drvdata(serio, NULL);
input_put_device(gunze->dev);
kfree(gunze);
}
/*
* gunze_connect() is the routine that is called when someone adds a
* new serio device that supports Gunze protocol and registers it as
* an input device.
*/
static int gunze_connect(struct serio *serio, struct serio_driver *drv)
{
struct gunze *gunze;
struct input_dev *input_dev;
int err;
gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
input_dev = input_allocate_device();
if (!gunze || !input_dev) {
err = -ENOMEM;
goto fail1;
}
gunze->serio = serio;
gunze->dev = input_dev;
snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
input_dev->name = "Gunze AHL-51S TouchScreen";
input_dev->phys = gunze->phys;
input_dev->id.bustype = BUS_RS232;
input_dev->id.vendor = SERIO_GUNZE;
input_dev->id.product = 0x0051;
input_dev->id.version = 0x0100;
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(input_dev, ABS_X, 24, 1000, 0, 0);
input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);
serio_set_drvdata(serio, gunze);
err = serio_open(serio, drv);
if (err)
goto fail2;
err = input_register_device(gunze->dev);
if (err)
goto fail3;
return 0;
fail3: serio_close(serio);
fail2: serio_set_drvdata(serio, NULL);
fail1: input_free_device(input_dev);
kfree(gunze);
return err;
}
/*
* The serio driver structure.
*/
static struct serio_device_id gunze_serio_ids[] = {
{
.type = SERIO_RS232,
.proto = SERIO_GUNZE,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{ 0 }
};
MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
static struct serio_driver gunze_drv = {
.driver = {
.name = "gunze",
},
.description = DRIVER_DESC,
.id_table = gunze_serio_ids,
.interrupt = gunze_interrupt,
.connect = gunze_connect,
.disconnect = gunze_disconnect,
};
module_serio_driver(gunze_drv);