2 * $Id: gunze.c,v 1.12 2001/09/25 10:12:07 vojtech Exp $
4 * Copyright (c) 2000-2001 Vojtech Pavlik
8 * Gunze AHL-51S touchscreen driver for Linux
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 * Should you need to contact me, the author, you can do so either by
27 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
28 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
31 #include <linux/errno.h>
32 #include <linux/kernel.h>
33 #include <linux/module.h>
34 #include <linux/slab.h>
35 #include <linux/input.h>
36 #include <linux/serio.h>
37 #include <linux/init.h>
39 #define DRIVER_DESC "Gunze AHL-51S touchscreen driver"
41 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
42 MODULE_DESCRIPTION(DRIVER_DESC);
43 MODULE_LICENSE("GPL");
46 * Definitions & global arrays.
49 #define GUNZE_MAX_LENGTH 10
52 * Per-touchscreen data.
56 struct input_dev *dev;
59 unsigned char data[GUNZE_MAX_LENGTH];
63 static void gunze_process_packet(struct gunze* gunze)
65 struct input_dev *dev = gunze->dev;
67 if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||
68 (gunze->data[0] != 'T' && gunze->data[0] != 'R')) {
69 printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);
73 input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
74 input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
75 input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
79 static irqreturn_t gunze_interrupt(struct serio *serio,
80 unsigned char data, unsigned int flags)
82 struct gunze* gunze = serio_get_drvdata(serio);
85 gunze_process_packet(gunze);
88 if (gunze->idx < GUNZE_MAX_LENGTH)
89 gunze->data[gunze->idx++] = data;
95 * gunze_disconnect() is the opposite of gunze_connect()
98 static void gunze_disconnect(struct serio *serio)
100 struct gunze *gunze = serio_get_drvdata(serio);
102 input_get_device(gunze->dev);
103 input_unregister_device(gunze->dev);
105 serio_set_drvdata(serio, NULL);
106 input_put_device(gunze->dev);
111 * gunze_connect() is the routine that is called when someone adds a
112 * new serio device that supports Gunze protocol and registers it as
116 static int gunze_connect(struct serio *serio, struct serio_driver *drv)
119 struct input_dev *input_dev;
122 gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
123 input_dev = input_allocate_device();
124 if (!gunze || !input_dev) {
129 gunze->serio = serio;
130 gunze->dev = input_dev;
131 snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
133 input_dev->name = "Gunze AHL-51S TouchScreen";
134 input_dev->phys = gunze->phys;
135 input_dev->id.bustype = BUS_RS232;
136 input_dev->id.vendor = SERIO_GUNZE;
137 input_dev->id.product = 0x0051;
138 input_dev->id.version = 0x0100;
139 input_dev->dev.parent = &serio->dev;
140 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
141 input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
142 input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0);
143 input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);
145 serio_set_drvdata(serio, gunze);
147 err = serio_open(serio, drv);
151 err = input_register_device(gunze->dev);
157 fail3: serio_close(serio);
158 fail2: serio_set_drvdata(serio, NULL);
159 fail1: input_free_device(input_dev);
165 * The serio driver structure.
168 static struct serio_device_id gunze_serio_ids[] = {
171 .proto = SERIO_GUNZE,
178 MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
180 static struct serio_driver gunze_drv = {
184 .description = DRIVER_DESC,
185 .id_table = gunze_serio_ids,
186 .interrupt = gunze_interrupt,
187 .connect = gunze_connect,
188 .disconnect = gunze_disconnect,
192 * The functions for inserting/removing us as a module.
195 static int __init gunze_init(void)
197 return serio_register_driver(&gunze_drv);
200 static void __exit gunze_exit(void)
202 serio_unregister_driver(&gunze_drv);
205 module_init(gunze_init);
206 module_exit(gunze_exit);