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);