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 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
40 MODULE_DESCRIPTION("Gunze AHL-51S touchscreen driver");
41 MODULE_LICENSE("GPL");
44 * Definitions & global arrays.
47 #define GUNZE_MAX_LENGTH 10
49 static char *gunze_name = "Gunze AHL-51S TouchScreen";
52 * Per-touchscreen data.
59 unsigned char data[GUNZE_MAX_LENGTH];
63 static void gunze_process_packet(struct gunze* gunze, struct pt_regs *regs)
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')) {
70 printk(KERN_WARNING "gunze.c: bad packet: >%s<\n", gunze->data);
74 input_regs(dev, regs);
75 input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10) * 4);
76 input_report_abs(dev, ABS_Y, 3072 - simple_strtoul(gunze->data + 6, NULL, 10) * 3);
77 input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
81 static irqreturn_t gunze_interrupt(struct serio *serio,
82 unsigned char data, unsigned int flags, struct pt_regs *regs)
84 struct gunze* gunze = serio->private;
87 gunze_process_packet(gunze, regs);
90 if (gunze->idx < GUNZE_MAX_LENGTH)
91 gunze->data[gunze->idx++] = data;
97 * gunze_disconnect() is the opposite of gunze_connect()
100 static void gunze_disconnect(struct serio *serio)
102 struct gunze* gunze = serio->private;
103 input_unregister_device(&gunze->dev);
109 * gunze_connect() is the routine that is called when someone adds a
110 * new serio device. It looks whether it was registered as a Gunze touchscreen
111 * and if yes, registers it as an input device.
114 static void gunze_connect(struct serio *serio, struct serio_dev *dev)
118 if (serio->type != (SERIO_RS232 | SERIO_GUNZE))
121 if (!(gunze = kmalloc(sizeof(struct gunze), GFP_KERNEL)))
124 memset(gunze, 0, sizeof(struct gunze));
126 init_input_dev(&gunze->dev);
127 gunze->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
128 gunze->dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
129 input_set_abs_params(&gunze->dev, ABS_X, 96, 4000, 0, 0);
130 input_set_abs_params(&gunze->dev, ABS_Y, 72, 3000, 0, 0);
132 gunze->serio = serio;
133 serio->private = gunze;
135 sprintf(gunze->phys, "%s/input0", serio->phys);
137 gunze->dev.private = gunze;
138 gunze->dev.name = gunze_name;
139 gunze->dev.phys = gunze->phys;
140 gunze->dev.id.bustype = BUS_RS232;
141 gunze->dev.id.vendor = SERIO_GUNZE;
142 gunze->dev.id.product = 0x0051;
143 gunze->dev.id.version = 0x0100;
145 if (serio_open(serio, dev)) {
150 input_register_device(&gunze->dev);
152 printk(KERN_INFO "input: %s on %s\n", gunze_name, serio->phys);
156 * The serio device structure.
159 static struct serio_dev gunze_dev = {
160 .interrupt = gunze_interrupt,
161 .connect = gunze_connect,
162 .disconnect = gunze_disconnect,
166 * The functions for inserting/removing us as a module.
169 int __init gunze_init(void)
171 serio_register_device(&gunze_dev);
175 void __exit gunze_exit(void)
177 serio_unregister_device(&gunze_dev);
180 module_init(gunze_init);
181 module_exit(gunze_exit);