1/*
2 *  Copyright (c) 2000-2001 Vojtech Pavlik
3 */
4
5/*
6 * Gunze AHL-51S touchscreen driver for Linux
7 */
8
9/*
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.
14 *
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.
19 *
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
23 *
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
27 */
28
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
36#define DRIVER_DESC	"Gunze AHL-51S touchscreen driver"
37
38MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
39MODULE_DESCRIPTION(DRIVER_DESC);
40MODULE_LICENSE("GPL");
41
42/*
43 * Definitions & global arrays.
44 */
45
46#define	GUNZE_MAX_LENGTH	10
47
48/*
49 * Per-touchscreen data.
50 */
51
52struct gunze {
53	struct input_dev *dev;
54	struct serio *serio;
55	int idx;
56	unsigned char data[GUNZE_MAX_LENGTH];
57	char phys[32];
58};
59
60static void gunze_process_packet(struct gunze* gunze)
61{
62	struct input_dev *dev = gunze->dev;
63
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);
67		return;
68	}
69
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');
73	input_sync(dev);
74}
75
76static irqreturn_t gunze_interrupt(struct serio *serio,
77		unsigned char data, unsigned int flags)
78{
79	struct gunze* gunze = serio_get_drvdata(serio);
80
81	if (data == '\r') {
82		gunze_process_packet(gunze);
83		gunze->idx = 0;
84	} else {
85		if (gunze->idx < GUNZE_MAX_LENGTH)
86			gunze->data[gunze->idx++] = data;
87	}
88	return IRQ_HANDLED;
89}
90
91/*
92 * gunze_disconnect() is the opposite of gunze_connect()
93 */
94
95static void gunze_disconnect(struct serio *serio)
96{
97	struct gunze *gunze = serio_get_drvdata(serio);
98
99	input_get_device(gunze->dev);
100	input_unregister_device(gunze->dev);
101	serio_close(serio);
102	serio_set_drvdata(serio, NULL);
103	input_put_device(gunze->dev);
104	kfree(gunze);
105}
106
107/*
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
110 * an input device.
111 */
112
113static int gunze_connect(struct serio *serio, struct serio_driver *drv)
114{
115	struct gunze *gunze;
116	struct input_dev *input_dev;
117	int err;
118
119	gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
120	input_dev = input_allocate_device();
121	if (!gunze || !input_dev) {
122		err = -ENOMEM;
123		goto fail1;
124	}
125
126	gunze->serio = serio;
127	gunze->dev = input_dev;
128	snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
129
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);
141
142	serio_set_drvdata(serio, gunze);
143
144	err = serio_open(serio, drv);
145	if (err)
146		goto fail2;
147
148	err = input_register_device(gunze->dev);
149	if (err)
150		goto fail3;
151
152	return 0;
153
154 fail3:	serio_close(serio);
155 fail2:	serio_set_drvdata(serio, NULL);
156 fail1:	input_free_device(input_dev);
157	kfree(gunze);
158	return err;
159}
160
161/*
162 * The serio driver structure.
163 */
164
165static struct serio_device_id gunze_serio_ids[] = {
166	{
167		.type	= SERIO_RS232,
168		.proto	= SERIO_GUNZE,
169		.id	= SERIO_ANY,
170		.extra	= SERIO_ANY,
171	},
172	{ 0 }
173};
174
175MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
176
177static struct serio_driver gunze_drv = {
178	.driver		= {
179		.name	= "gunze",
180	},
181	.description	= DRIVER_DESC,
182	.id_table	= gunze_serio_ids,
183	.interrupt	= gunze_interrupt,
184	.connect	= gunze_connect,
185	.disconnect	= gunze_disconnect,
186};
187
188module_serio_driver(gunze_drv);
189