2 * Copyright (c) 2000-2001 Vojtech Pavlik
6 * Gunze AHL-51S touchscreen driver for Linux
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 * Should you need to contact me, the author, you can do so either by
25 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
26 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
29 #include <linux/errno.h>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/slab.h>
33 #include <linux/input.h>
34 #include <linux/serio.h>
35 #include <linux/init.h>
37 #define DRIVER_DESC "Gunze AHL-51S touchscreen driver"
39 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
40 MODULE_DESCRIPTION(DRIVER_DESC);
41 MODULE_LICENSE("GPL");
44 * Definitions & global arrays.
47 #define GUNZE_MAX_LENGTH 10
50 * Per-touchscreen data.
54 struct input_dev *dev;
57 unsigned char data[GUNZE_MAX_LENGTH];
61 static void gunze_process_packet(struct gunze* gunze)
63 struct input_dev *dev = gunze->dev;
65 if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||
66 (gunze->data[0] != 'T' && gunze->data[0] != 'R')) {
67 printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);
71 input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
72 input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
73 input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
77 static irqreturn_t gunze_interrupt(struct serio *serio,
78 unsigned char data, unsigned int flags)
80 struct gunze* gunze = serio_get_drvdata(serio);
83 gunze_process_packet(gunze);
86 if (gunze->idx < GUNZE_MAX_LENGTH)
87 gunze->data[gunze->idx++] = data;
93 * gunze_disconnect() is the opposite of gunze_connect()
96 static void gunze_disconnect(struct serio *serio)
98 struct gunze *gunze = serio_get_drvdata(serio);
100 input_get_device(gunze->dev);
101 input_unregister_device(gunze->dev);
103 serio_set_drvdata(serio, NULL);
104 input_put_device(gunze->dev);
109 * gunze_connect() is the routine that is called when someone adds a
110 * new serio device that supports Gunze protocol and registers it as
114 static int gunze_connect(struct serio *serio, struct serio_driver *drv)
117 struct input_dev *input_dev;
120 gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
121 input_dev = input_allocate_device();
122 if (!gunze || !input_dev) {
127 gunze->serio = serio;
128 gunze->dev = input_dev;
129 snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
131 input_dev->name = "Gunze AHL-51S TouchScreen";
132 input_dev->phys = gunze->phys;
133 input_dev->id.bustype = BUS_RS232;
134 input_dev->id.vendor = SERIO_GUNZE;
135 input_dev->id.product = 0x0051;
136 input_dev->id.version = 0x0100;
137 input_dev->dev.parent = &serio->dev;
138 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
139 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
140 input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0);
141 input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);
143 serio_set_drvdata(serio, gunze);
145 err = serio_open(serio, drv);
149 err = input_register_device(gunze->dev);
155 fail3: serio_close(serio);
156 fail2: serio_set_drvdata(serio, NULL);
157 fail1: input_free_device(input_dev);
163 * The serio driver structure.
166 static struct serio_device_id gunze_serio_ids[] = {
169 .proto = SERIO_GUNZE,
176 MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
178 static struct serio_driver gunze_drv = {
182 .description = DRIVER_DESC,
183 .id_table = gunze_serio_ids,
184 .interrupt = gunze_interrupt,
185 .connect = gunze_connect,
186 .disconnect = gunze_disconnect,
190 * The functions for inserting/removing us as a module.
193 static int __init gunze_init(void)
195 return serio_register_driver(&gunze_drv);
198 static void __exit gunze_exit(void)
200 serio_unregister_driver(&gunze_drv);
203 module_init(gunze_init);
204 module_exit(gunze_exit);