blob: 4000e52054075acb33b2dae5dcf2fe5d34eb1ce8 [file] [log] [blame]
Rick Koch4003dff2006-08-05 00:32:24 -04001/*
2 * Touchright serial touchscreen driver
3 *
4 * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
5 *
6 * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c)
7 * Copyright (c) 2004 Vojtech Pavlik
8 * and Dan Streetman <ddstreet@ieee.org>
9 */
10
11/*
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.
15 */
16
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>
Rick Koch4003dff2006-08-05 00:32:24 -040023
24#define DRIVER_DESC "Touchright serial touchscreen driver"
25
26MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
27MODULE_DESCRIPTION(DRIVER_DESC);
28MODULE_LICENSE("GPL");
29
30/*
31 * Definitions & global arrays.
32 */
33
34#define TR_FORMAT_TOUCH_BIT 0x01
35#define TR_FORMAT_STATUS_BYTE 0x40
36#define TR_FORMAT_STATUS_MASK ~TR_FORMAT_TOUCH_BIT
37
38#define TR_LENGTH 5
39
40#define TR_MIN_XC 0
41#define TR_MAX_XC 0x1ff
42#define TR_MIN_YC 0
43#define TR_MAX_YC 0x1ff
44
45/*
46 * Per-touchscreen data.
47 */
48
49struct tr {
50 struct input_dev *dev;
51 struct serio *serio;
52 int idx;
53 unsigned char data[TR_LENGTH];
54 char phys[32];
55};
56
57static irqreturn_t tr_interrupt(struct serio *serio,
David Howells7d12e782006-10-05 14:55:46 +010058 unsigned char data, unsigned int flags)
Rick Koch4003dff2006-08-05 00:32:24 -040059{
60 struct tr *tr = serio_get_drvdata(serio);
61 struct input_dev *dev = tr->dev;
62
63 tr->data[tr->idx] = data;
64
65 if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) {
66 if (++tr->idx == TR_LENGTH) {
Rick Koch4003dff2006-08-05 00:32:24 -040067 input_report_abs(dev, ABS_X,
68 (tr->data[1] << 5) | (tr->data[2] >> 1));
69 input_report_abs(dev, ABS_Y,
70 (tr->data[3] << 5) | (tr->data[4] >> 1));
71 input_report_key(dev, BTN_TOUCH,
72 tr->data[0] & TR_FORMAT_TOUCH_BIT);
73 input_sync(dev);
74 tr->idx = 0;
75 }
76 }
77
78 return IRQ_HANDLED;
79}
80
81/*
82 * tr_disconnect() is the opposite of tr_connect()
83 */
84
85static void tr_disconnect(struct serio *serio)
86{
87 struct tr *tr = serio_get_drvdata(serio);
88
89 input_get_device(tr->dev);
90 input_unregister_device(tr->dev);
91 serio_close(serio);
92 serio_set_drvdata(serio, NULL);
93 input_put_device(tr->dev);
94 kfree(tr);
95}
96
97/*
98 * tr_connect() is the routine that is called when someone adds a
99 * new serio device that supports the Touchright protocol and registers it as
100 * an input device.
101 */
102
103static int tr_connect(struct serio *serio, struct serio_driver *drv)
104{
105 struct tr *tr;
106 struct input_dev *input_dev;
107 int err;
108
109 tr = kzalloc(sizeof(struct tr), GFP_KERNEL);
110 input_dev = input_allocate_device();
111 if (!tr || !input_dev) {
112 err = -ENOMEM;
113 goto fail1;
114 }
115
116 tr->serio = serio;
117 tr->dev = input_dev;
118 snprintf(tr->phys, sizeof(tr->phys), "%s/input0", serio->phys);
119
Rick Koch4003dff2006-08-05 00:32:24 -0400120 input_dev->name = "Touchright Serial TouchScreen";
121 input_dev->phys = tr->phys;
122 input_dev->id.bustype = BUS_RS232;
123 input_dev->id.vendor = SERIO_TOUCHRIGHT;
124 input_dev->id.product = 0;
125 input_dev->id.version = 0x0100;
Dmitry Torokhova5394fb02007-04-12 01:35:14 -0400126 input_dev->dev.parent = &serio->dev;
Jiri Slaby7b19ada2007-10-18 23:40:32 -0700127 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
128 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
Rick Koch4003dff2006-08-05 00:32:24 -0400129 input_set_abs_params(tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, 0, 0);
130 input_set_abs_params(tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, 0, 0);
131
132 serio_set_drvdata(serio, tr);
133
134 err = serio_open(serio, drv);
135 if (err)
136 goto fail2;
137
138 err = input_register_device(tr->dev);
139 if (err)
140 goto fail3;
141
142 return 0;
143
144 fail3: serio_close(serio);
145 fail2: serio_set_drvdata(serio, NULL);
146 fail1: input_free_device(input_dev);
147 kfree(tr);
148 return err;
149}
150
151/*
152 * The serio driver structure.
153 */
154
155static struct serio_device_id tr_serio_ids[] = {
156 {
157 .type = SERIO_RS232,
158 .proto = SERIO_TOUCHRIGHT,
159 .id = SERIO_ANY,
160 .extra = SERIO_ANY,
161 },
162 { 0 }
163};
164
165MODULE_DEVICE_TABLE(serio, tr_serio_ids);
166
167static struct serio_driver tr_drv = {
168 .driver = {
169 .name = "touchright",
170 },
171 .description = DRIVER_DESC,
172 .id_table = tr_serio_ids,
173 .interrupt = tr_interrupt,
174 .connect = tr_connect,
175 .disconnect = tr_disconnect,
176};
177
Axel Lin65ac9f72012-04-03 23:50:17 -0700178module_serio_driver(tr_drv);