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>
36 #define DRIVER_DESC "Gunze AHL-51S touchscreen driver"
38 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
39 MODULE_DESCRIPTION(DRIVER_DESC);
40 MODULE_LICENSE("GPL");
43 * Definitions & global arrays.
46 #define GUNZE_MAX_LENGTH 10
49 * Per-touchscreen data.
53 struct input_dev *dev;
56 unsigned char data[GUNZE_MAX_LENGTH];
60 static void gunze_process_packet(struct gunze* gunze)
62 struct input_dev *dev = gunze->dev;
64 if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||
65 (gunze->data[0] != 'T' && gunze->data[0] != 'R')) {
66 printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);
70 input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
71 input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
72 input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
76 static irqreturn_t gunze_interrupt(struct serio *serio,
77 unsigned char data, unsigned int flags)
79 struct gunze* gunze = serio_get_drvdata(serio);
82 gunze_process_packet(gunze);
85 if (gunze->idx < GUNZE_MAX_LENGTH)
86 gunze->data[gunze->idx++] = data;
92 * gunze_disconnect() is the opposite of gunze_connect()
95 static void gunze_disconnect(struct serio *serio)
97 struct gunze *gunze = serio_get_drvdata(serio);
99 input_get_device(gunze->dev);
100 input_unregister_device(gunze->dev);
102 serio_set_drvdata(serio, NULL);
103 input_put_device(gunze->dev);
108 * gunze_connect() is the routine that is called when someone adds a
109 * new serio device that supports Gunze protocol and registers it as
113 static int gunze_connect(struct serio *serio, struct serio_driver *drv)
116 struct input_dev *input_dev;
119 gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
120 input_dev = input_allocate_device();
121 if (!gunze || !input_dev) {
126 gunze->serio = serio;
127 gunze->dev = input_dev;
128 snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
130 input_dev->name = "Gunze AHL-51S TouchScreen";
131 input_dev->phys = gunze->phys;
132 input_dev->id.bustype = BUS_RS232;
133 input_dev->id.vendor = SERIO_GUNZE;
134 input_dev->id.product = 0x0051;
135 input_dev->id.version = 0x0100;
136 input_dev->dev.parent = &serio->dev;
137 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
138 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
139 input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0);
140 input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);
142 serio_set_drvdata(serio, gunze);
144 err = serio_open(serio, drv);
148 err = input_register_device(gunze->dev);
154 fail3: serio_close(serio);
155 fail2: serio_set_drvdata(serio, NULL);
156 fail1: input_free_device(input_dev);
162 * The serio driver structure.
165 static struct serio_device_id gunze_serio_ids[] = {
168 .proto = SERIO_GUNZE,
175 MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
177 static struct serio_driver gunze_drv = {
181 .description = DRIVER_DESC,
182 .id_table = gunze_serio_ids,
183 .interrupt = gunze_interrupt,
184 .connect = gunze_connect,
185 .disconnect = gunze_disconnect,
188 module_serio_driver(gunze_drv);