1 /*
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>
23 #include <linux/init.h>
24
25 #define DRIVER_DESC "Touchright serial touchscreen driver"
26
27 MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
28 MODULE_DESCRIPTION(DRIVER_DESC);
29 MODULE_LICENSE("GPL");
30
31 /*
32 * Definitions & global arrays.
33 */
34
35 #define TR_FORMAT_TOUCH_BIT 0x01
36 #define TR_FORMAT_STATUS_BYTE 0x40
37 #define TR_FORMAT_STATUS_MASK ~TR_FORMAT_TOUCH_BIT
38
39 #define TR_LENGTH 5
40
41 #define TR_MIN_XC 0
42 #define TR_MAX_XC 0x1ff
43 #define TR_MIN_YC 0
44 #define TR_MAX_YC 0x1ff
45
46 /*
47 * Per-touchscreen data.
48 */
49
50 struct tr {
51 struct input_dev *dev;
52 struct serio *serio;
53 int idx;
54 unsigned char data[TR_LENGTH];
55 char phys[32];
56 };
57
58 static irqreturn_t tr_interrupt(struct serio *serio,
59 unsigned char data, unsigned int flags)
60 {
61 struct tr *tr = serio_get_drvdata(serio);
62 struct input_dev *dev = tr->dev;
63
64 tr->data[tr->idx] = data;
65
66 if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) {
67 if (++tr->idx == TR_LENGTH) {
68 input_report_abs(dev, ABS_X,
69 (tr->data[1] << 5) | (tr->data[2] >> 1));
70 input_report_abs(dev, ABS_Y,
71 (tr->data[3] << 5) | (tr->data[4] >> 1));
72 input_report_key(dev, BTN_TOUCH,
73 tr->data[0] & TR_FORMAT_TOUCH_BIT);
74 input_sync(dev);
75 tr->idx = 0;
76 }
77 }
78
79 return IRQ_HANDLED;
80 }
81
82 /*
83 * tr_disconnect() is the opposite of tr_connect()
84 */
85
86 static void tr_disconnect(struct serio *serio)
87 {
88 struct tr *tr = serio_get_drvdata(serio);
89
90 input_get_device(tr->dev);
91 input_unregister_device(tr->dev);
92 serio_close(serio);
93 serio_set_drvdata(serio, NULL);
94 input_put_device(tr->dev);
95 kfree(tr);
96 }
97
98 /*
99 * tr_connect() is the routine that is called when someone adds a
100 * new serio device that supports the Touchright protocol and registers it as
101 * an input device.
102 */
103
104 static int tr_connect(struct serio *serio, struct serio_driver *drv)
105 {
106 struct tr *tr;
107 struct input_dev *input_dev;
108 int err;
109
110 tr = kzalloc(sizeof(struct tr), GFP_KERNEL);
111 input_dev = input_allocate_device();
112 if (!tr || !input_dev) {
113 err = -ENOMEM;
114 goto fail1;
115 }
116
117 tr->serio = serio;
118 tr->dev = input_dev;
119 snprintf(tr->phys, sizeof(tr->phys), "%s/input0", serio->phys);
120
121 input_dev->name = "Touchright Serial TouchScreen";
122 input_dev->phys = tr->phys;
123 input_dev->id.bustype = BUS_RS232;
124 input_dev->id.vendor = SERIO_TOUCHRIGHT;
125 input_dev->id.product = 0;
126 input_dev->id.version = 0x0100;
127 input_dev->dev.parent = &serio->dev;
128 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
129 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
130 input_set_abs_params(tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, 0, 0);
131 input_set_abs_params(tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, 0, 0);
132
133 serio_set_drvdata(serio, tr);
134
135 err = serio_open(serio, drv);
136 if (err)
137 goto fail2;
138
139 err = input_register_device(tr->dev);
140 if (err)
141 goto fail3;
142
143 return 0;
144
145 fail3: serio_close(serio);
146 fail2: serio_set_drvdata(serio, NULL);
147 fail1: input_free_device(input_dev);
148 kfree(tr);
149 return err;
150 }
151
152 /*
153 * The serio driver structure.
154 */
155
156 static struct serio_device_id tr_serio_ids[] = {
157 {
158 .type = SERIO_RS232,
159 .proto = SERIO_TOUCHRIGHT,
160 .id = SERIO_ANY,
161 .extra = SERIO_ANY,
162 },
163 { 0 }
164 };
165
166 MODULE_DEVICE_TABLE(serio, tr_serio_ids);
167
168 static struct serio_driver tr_drv = {
169 .driver = {
170 .name = "touchright",
171 },
172 .description = DRIVER_DESC,
173 .id_table = tr_serio_ids,
174 .interrupt = tr_interrupt,
175 .connect = tr_connect,
176 .disconnect = tr_disconnect,
177 };
178
179 /*
180 * The functions for inserting/removing us as a module.
181 */
182
183 static int __init tr_init(void)
184 {
185 return serio_register_driver(&tr_drv);
186 }
187
188 static void __exit tr_exit(void)
189 {
190 serio_unregister_driver(&tr_drv);
191 }
192
193 module_init(tr_init);
194 module_exit(tr_exit);
195
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