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1/*
2 * Touchwindow 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/*
18 * 2005/02/19 Rick Koch:
19 * The Touchwindow I used is made by Edmark Corp. and
20 * constantly outputs a stream of 0's unless it is touched.
21 * It then outputs 3 bytes: X, Y, and a copy of Y.
22 */
23
24#include <linux/errno.h>
25#include <linux/kernel.h>
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/input.h>
29#include <linux/serio.h>
30#include <linux/init.h>
31
32#define DRIVER_DESC "Touchwindow serial touchscreen driver"
33
34MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
35MODULE_DESCRIPTION(DRIVER_DESC);
36MODULE_LICENSE("GPL");
37
38/*
39 * Definitions & global arrays.
40 */
41
42#define TW_LENGTH 3
43
44#define TW_MIN_XC 0
45#define TW_MAX_XC 0xff
46#define TW_MIN_YC 0
47#define TW_MAX_YC 0xff
48
49/*
50 * Per-touchscreen data.
51 */
52
53struct tw {
54 struct input_dev *dev;
55 struct serio *serio;
56 int idx;
57 int touched;
58 unsigned char data[TW_LENGTH];
59 char phys[32];
60};
61
62static irqreturn_t tw_interrupt(struct serio *serio,
63 unsigned char data, unsigned int flags)
64{
65 struct tw *tw = serio_get_drvdata(serio);
66 struct input_dev *dev = tw->dev;
67
68 if (data) { /* touch */
69 tw->touched = 1;
70 tw->data[tw->idx++] = data;
71 /* verify length and that the two Y's are the same */
72 if (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) {
73 input_report_abs(dev, ABS_X, tw->data[0]);
74 input_report_abs(dev, ABS_Y, tw->data[1]);
75 input_report_key(dev, BTN_TOUCH, 1);
76 input_sync(dev);
77 tw->idx = 0;
78 }
79 } else if (tw->touched) { /* untouch */
80 input_report_key(dev, BTN_TOUCH, 0);
81 input_sync(dev);
82 tw->idx = 0;
83 tw->touched = 0;
84 }
85
86 return IRQ_HANDLED;
87}
88
89/*
90 * tw_disconnect() is the opposite of tw_connect()
91 */
92
93static void tw_disconnect(struct serio *serio)
94{
95 struct tw *tw = serio_get_drvdata(serio);
96
97 input_get_device(tw->dev);
98 input_unregister_device(tw->dev);
99 serio_close(serio);
100 serio_set_drvdata(serio, NULL);
101 input_put_device(tw->dev);
102 kfree(tw);
103}
104
105/*
106 * tw_connect() is the routine that is called when someone adds a
107 * new serio device that supports the Touchwin protocol and registers it as
108 * an input device.
109 */
110
111static int tw_connect(struct serio *serio, struct serio_driver *drv)
112{
113 struct tw *tw;
114 struct input_dev *input_dev;
115 int err;
116
117 tw = kzalloc(sizeof(struct tw), GFP_KERNEL);
118 input_dev = input_allocate_device();
119 if (!tw || !input_dev) {
120 err = -ENOMEM;
121 goto fail1;
122 }
123
124 tw->serio = serio;
125 tw->dev = input_dev;
126 snprintf(tw->phys, sizeof(tw->phys), "%s/input0", serio->phys);
127
128 input_dev->name = "Touchwindow Serial TouchScreen";
129 input_dev->phys = tw->phys;
130 input_dev->id.bustype = BUS_RS232;
131 input_dev->id.vendor = SERIO_TOUCHWIN;
132 input_dev->id.product = 0;
133 input_dev->id.version = 0x0100;
134 input_dev->dev.parent = &serio->dev;
135 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
136 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
137 input_set_abs_params(tw->dev, ABS_X, TW_MIN_XC, TW_MAX_XC, 0, 0);
138 input_set_abs_params(tw->dev, ABS_Y, TW_MIN_YC, TW_MAX_YC, 0, 0);
139
140 serio_set_drvdata(serio, tw);
141
142 err = serio_open(serio, drv);
143 if (err)
144 goto fail2;
145
146 err = input_register_device(tw->dev);
147 if (err)
148 goto fail3;
149
150 return 0;
151
152 fail3: serio_close(serio);
153 fail2: serio_set_drvdata(serio, NULL);
154 fail1: input_free_device(input_dev);
155 kfree(tw);
156 return err;
157}
158
159/*
160 * The serio driver structure.
161 */
162
163static struct serio_device_id tw_serio_ids[] = {
164 {
165 .type = SERIO_RS232,
166 .proto = SERIO_TOUCHWIN,
167 .id = SERIO_ANY,
168 .extra = SERIO_ANY,
169 },
170 { 0 }
171};
172
173MODULE_DEVICE_TABLE(serio, tw_serio_ids);
174
175static struct serio_driver tw_drv = {
176 .driver = {
177 .name = "touchwin",
178 },
179 .description = DRIVER_DESC,
180 .id_table = tw_serio_ids,
181 .interrupt = tw_interrupt,
182 .connect = tw_connect,
183 .disconnect = tw_disconnect,
184};
185
186/*
187 * The functions for inserting/removing us as a module.
188 */
189
190static int __init tw_init(void)
191{
192 return serio_register_driver(&tw_drv);
193}
194
195static void __exit tw_exit(void)
196{
197 serio_unregister_driver(&tw_drv);
198}
199
200module_init(tw_init);
201module_exit(tw_exit);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Touchwindow serial touchscreen driver
4 *
5 * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
6 *
7 * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c)
8 * Copyright (c) 2004 Vojtech Pavlik
9 * and Dan Streetman <ddstreet@ieee.org>
10 */
11
12
13/*
14 * 2005/02/19 Rick Koch:
15 * The Touchwindow I used is made by Edmark Corp. and
16 * constantly outputs a stream of 0's unless it is touched.
17 * It then outputs 3 bytes: X, Y, and a copy of Y.
18 */
19
20#include <linux/errno.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/slab.h>
24#include <linux/input.h>
25#include <linux/serio.h>
26
27#define DRIVER_DESC "Touchwindow serial touchscreen driver"
28
29MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
30MODULE_DESCRIPTION(DRIVER_DESC);
31MODULE_LICENSE("GPL");
32
33/*
34 * Definitions & global arrays.
35 */
36
37#define TW_LENGTH 3
38
39#define TW_MIN_XC 0
40#define TW_MAX_XC 0xff
41#define TW_MIN_YC 0
42#define TW_MAX_YC 0xff
43
44/*
45 * Per-touchscreen data.
46 */
47
48struct tw {
49 struct input_dev *dev;
50 struct serio *serio;
51 int idx;
52 int touched;
53 unsigned char data[TW_LENGTH];
54 char phys[32];
55};
56
57static irqreturn_t tw_interrupt(struct serio *serio,
58 unsigned char data, unsigned int flags)
59{
60 struct tw *tw = serio_get_drvdata(serio);
61 struct input_dev *dev = tw->dev;
62
63 if (data) { /* touch */
64 tw->touched = 1;
65 tw->data[tw->idx++] = data;
66 /* verify length and that the two Y's are the same */
67 if (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) {
68 input_report_abs(dev, ABS_X, tw->data[0]);
69 input_report_abs(dev, ABS_Y, tw->data[1]);
70 input_report_key(dev, BTN_TOUCH, 1);
71 input_sync(dev);
72 tw->idx = 0;
73 }
74 } else if (tw->touched) { /* untouch */
75 input_report_key(dev, BTN_TOUCH, 0);
76 input_sync(dev);
77 tw->idx = 0;
78 tw->touched = 0;
79 }
80
81 return IRQ_HANDLED;
82}
83
84/*
85 * tw_disconnect() is the opposite of tw_connect()
86 */
87
88static void tw_disconnect(struct serio *serio)
89{
90 struct tw *tw = serio_get_drvdata(serio);
91
92 input_get_device(tw->dev);
93 input_unregister_device(tw->dev);
94 serio_close(serio);
95 serio_set_drvdata(serio, NULL);
96 input_put_device(tw->dev);
97 kfree(tw);
98}
99
100/*
101 * tw_connect() is the routine that is called when someone adds a
102 * new serio device that supports the Touchwin protocol and registers it as
103 * an input device.
104 */
105
106static int tw_connect(struct serio *serio, struct serio_driver *drv)
107{
108 struct tw *tw;
109 struct input_dev *input_dev;
110 int err;
111
112 tw = kzalloc(sizeof(*tw), GFP_KERNEL);
113 input_dev = input_allocate_device();
114 if (!tw || !input_dev) {
115 err = -ENOMEM;
116 goto fail1;
117 }
118
119 tw->serio = serio;
120 tw->dev = input_dev;
121 snprintf(tw->phys, sizeof(tw->phys), "%s/input0", serio->phys);
122
123 input_dev->name = "Touchwindow Serial TouchScreen";
124 input_dev->phys = tw->phys;
125 input_dev->id.bustype = BUS_RS232;
126 input_dev->id.vendor = SERIO_TOUCHWIN;
127 input_dev->id.product = 0;
128 input_dev->id.version = 0x0100;
129 input_dev->dev.parent = &serio->dev;
130 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
131 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
132 input_set_abs_params(tw->dev, ABS_X, TW_MIN_XC, TW_MAX_XC, 0, 0);
133 input_set_abs_params(tw->dev, ABS_Y, TW_MIN_YC, TW_MAX_YC, 0, 0);
134
135 serio_set_drvdata(serio, tw);
136
137 err = serio_open(serio, drv);
138 if (err)
139 goto fail2;
140
141 err = input_register_device(tw->dev);
142 if (err)
143 goto fail3;
144
145 return 0;
146
147 fail3: serio_close(serio);
148 fail2: serio_set_drvdata(serio, NULL);
149 fail1: input_free_device(input_dev);
150 kfree(tw);
151 return err;
152}
153
154/*
155 * The serio driver structure.
156 */
157
158static const struct serio_device_id tw_serio_ids[] = {
159 {
160 .type = SERIO_RS232,
161 .proto = SERIO_TOUCHWIN,
162 .id = SERIO_ANY,
163 .extra = SERIO_ANY,
164 },
165 { 0 }
166};
167
168MODULE_DEVICE_TABLE(serio, tw_serio_ids);
169
170static struct serio_driver tw_drv = {
171 .driver = {
172 .name = "touchwin",
173 },
174 .description = DRIVER_DESC,
175 .id_table = tw_serio_ids,
176 .interrupt = tw_interrupt,
177 .connect = tw_connect,
178 .disconnect = tw_disconnect,
179};
180
181module_serio_driver(tw_drv);