2 * Touchright serial touchscreen driver
4 * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
6 * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c)
7 * Copyright (c) 2004 Vojtech Pavlik
8 * and Dan Streetman <ddstreet@ieee.org>
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License version 2 as published
14 * by the Free Software Foundation.
17 #include <linux/errno.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/slab.h>
21 #include <linux/input.h>
22 #include <linux/serio.h>
23 #include <linux/init.h>
25 #define DRIVER_DESC "Touchright serial touchscreen driver"
27 MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
28 MODULE_DESCRIPTION(DRIVER_DESC);
29 MODULE_LICENSE("GPL");
32 * Definitions & global arrays.
35 #define TR_FORMAT_TOUCH_BIT 0x01
36 #define TR_FORMAT_STATUS_BYTE 0x40
37 #define TR_FORMAT_STATUS_MASK ~TR_FORMAT_TOUCH_BIT
42 #define TR_MAX_XC 0x1ff
44 #define TR_MAX_YC 0x1ff
47 * Per-touchscreen data.
51 struct input_dev *dev;
54 unsigned char data[TR_LENGTH];
58 static irqreturn_t tr_interrupt(struct serio *serio,
59 unsigned char data, unsigned int flags, struct pt_regs *regs)
61 struct tr *tr = serio_get_drvdata(serio);
62 struct input_dev *dev = tr->dev;
64 tr->data[tr->idx] = data;
66 if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) {
67 if (++tr->idx == TR_LENGTH) {
68 input_regs(dev, regs);
69 input_report_abs(dev, ABS_X,
70 (tr->data[1] << 5) | (tr->data[2] >> 1));
71 input_report_abs(dev, ABS_Y,
72 (tr->data[3] << 5) | (tr->data[4] >> 1));
73 input_report_key(dev, BTN_TOUCH,
74 tr->data[0] & TR_FORMAT_TOUCH_BIT);
84 * tr_disconnect() is the opposite of tr_connect()
87 static void tr_disconnect(struct serio *serio)
89 struct tr *tr = serio_get_drvdata(serio);
91 input_get_device(tr->dev);
92 input_unregister_device(tr->dev);
94 serio_set_drvdata(serio, NULL);
95 input_put_device(tr->dev);
100 * tr_connect() is the routine that is called when someone adds a
101 * new serio device that supports the Touchright protocol and registers it as
105 static int tr_connect(struct serio *serio, struct serio_driver *drv)
108 struct input_dev *input_dev;
111 tr = kzalloc(sizeof(struct tr), GFP_KERNEL);
112 input_dev = input_allocate_device();
113 if (!tr || !input_dev) {
120 snprintf(tr->phys, sizeof(tr->phys), "%s/input0", serio->phys);
122 input_dev->private = tr;
123 input_dev->name = "Touchright Serial TouchScreen";
124 input_dev->phys = tr->phys;
125 input_dev->id.bustype = BUS_RS232;
126 input_dev->id.vendor = SERIO_TOUCHRIGHT;
127 input_dev->id.product = 0;
128 input_dev->id.version = 0x0100;
129 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
130 input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
131 input_set_abs_params(tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, 0, 0);
132 input_set_abs_params(tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, 0, 0);
134 serio_set_drvdata(serio, tr);
136 err = serio_open(serio, drv);
140 err = input_register_device(tr->dev);
146 fail3: serio_close(serio);
147 fail2: serio_set_drvdata(serio, NULL);
148 fail1: input_free_device(input_dev);
154 * The serio driver structure.
157 static struct serio_device_id tr_serio_ids[] = {
160 .proto = SERIO_TOUCHRIGHT,
167 MODULE_DEVICE_TABLE(serio, tr_serio_ids);
169 static struct serio_driver tr_drv = {
171 .name = "touchright",
173 .description = DRIVER_DESC,
174 .id_table = tr_serio_ids,
175 .interrupt = tr_interrupt,
176 .connect = tr_connect,
177 .disconnect = tr_disconnect,
181 * The functions for inserting/removing us as a module.
184 static int __init tr_init(void)
186 serio_register_driver(&tr_drv);
190 static void __exit tr_exit(void)
192 serio_unregister_driver(&tr_drv);
195 module_init(tr_init);
196 module_exit(tr_exit);