gunze.c revision a5394fb075a80212765ee3cd4a7842bdccf5fc0a 
1/*
2 * $Id: gunze.c,v 1.12 2001/09/25 10:12:07 vojtech Exp $
3 *
4 *  Copyright (c) 2000-2001 Vojtech Pavlik
5 */
6
7/*
8 * Gunze AHL-51S touchscreen driver for Linux
9 */
10
11/*
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.
16 *
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.
21 *
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
25 *
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
29 */
30
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>
38
39#define DRIVER_DESC	"Gunze AHL-51S touchscreen driver"
40
41MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
42MODULE_DESCRIPTION(DRIVER_DESC);
43MODULE_LICENSE("GPL");
44
45/*
46 * Definitions & global arrays.
47 */
48
49#define	GUNZE_MAX_LENGTH	10
50
51/*
52 * Per-touchscreen data.
53 */
54
55struct gunze {
56	struct input_dev *dev;
57	struct serio *serio;
58	int idx;
59	unsigned char data[GUNZE_MAX_LENGTH];
60	char phys[32];
61};
62
63static void gunze_process_packet(struct gunze* gunze)
64{
65	struct input_dev *dev = gunze->dev;
66
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);
70		return;
71	}
72
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');
76	input_sync(dev);
77}
78
79static irqreturn_t gunze_interrupt(struct serio *serio,
80		unsigned char data, unsigned int flags)
81{
82	struct gunze* gunze = serio_get_drvdata(serio);
83
84	if (data == '\r') {
85		gunze_process_packet(gunze);
86		gunze->idx = 0;
87	} else {
88		if (gunze->idx < GUNZE_MAX_LENGTH)
89			gunze->data[gunze->idx++] = data;
90	}
91	return IRQ_HANDLED;
92}
93
94/*
95 * gunze_disconnect() is the opposite of gunze_connect()
96 */
97
98static void gunze_disconnect(struct serio *serio)
99{
100	struct gunze *gunze = serio_get_drvdata(serio);
101
102	input_get_device(gunze->dev);
103	input_unregister_device(gunze->dev);
104	serio_close(serio);
105	serio_set_drvdata(serio, NULL);
106	input_put_device(gunze->dev);
107	kfree(gunze);
108}
109
110/*
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
113 * an input device.
114 */
115
116static int gunze_connect(struct serio *serio, struct serio_driver *drv)
117{
118	struct gunze *gunze;
119	struct input_dev *input_dev;
120	int err;
121
122	gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
123	input_dev = input_allocate_device();
124	if (!gunze || !input_dev) {
125		err = -ENOMEM;
126		goto fail1;
127	}
128
129	gunze->serio = serio;
130	gunze->dev = input_dev;
131	snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
132
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);
144
145	serio_set_drvdata(serio, gunze);
146
147	err = serio_open(serio, drv);
148	if (err)
149		goto fail2;
150
151	err = input_register_device(gunze->dev);
152	if (err)
153		goto fail3;
154
155	return 0;
156
157 fail3:	serio_close(serio);
158 fail2:	serio_set_drvdata(serio, NULL);
159 fail1:	input_free_device(input_dev);
160	kfree(gunze);
161	return err;
162}
163
164/*
165 * The serio driver structure.
166 */
167
168static struct serio_device_id gunze_serio_ids[] = {
169	{
170		.type	= SERIO_RS232,
171		.proto	= SERIO_GUNZE,
172		.id	= SERIO_ANY,
173		.extra	= SERIO_ANY,
174	},
175	{ 0 }
176};
177
178MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
179
180static struct serio_driver gunze_drv = {
181	.driver		= {
182		.name	= "gunze",
183	},
184	.description	= DRIVER_DESC,
185	.id_table	= gunze_serio_ids,
186	.interrupt	= gunze_interrupt,
187	.connect	= gunze_connect,
188	.disconnect	= gunze_disconnect,
189};
190
191/*
192 * The functions for inserting/removing us as a module.
193 */
194
195static int __init gunze_init(void)
196{
197	return serio_register_driver(&gunze_drv);
198}
199
200static void __exit gunze_exit(void)
201{
202	serio_unregister_driver(&gunze_drv);
203}
204
205module_init(gunze_init);
206module_exit(gunze_exit);
207