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1/*
2 * MicroTouch (3M) serial touchscreen driver
3 *
4 * Copyright (c) 2004 Vojtech Pavlik
5 */
6
7/*
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published by
10 * the Free Software Foundation.
11 */
12
13/*
14 * 2005/02/19 Dan Streetman <ddstreet@ieee.org>
15 * Copied elo.c and edited for MicroTouch protocol
16 */
17
18#include <linux/errno.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/slab.h>
22#include <linux/input.h>
23#include <linux/serio.h>
24
25#define DRIVER_DESC "MicroTouch serial touchscreen driver"
26
27MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
28MODULE_DESCRIPTION(DRIVER_DESC);
29MODULE_LICENSE("GPL");
30
31/*
32 * Definitions & global arrays.
33 */
34
35#define MTOUCH_FORMAT_TABLET_STATUS_BIT 0x80
36#define MTOUCH_FORMAT_TABLET_TOUCH_BIT 0x40
37#define MTOUCH_FORMAT_TABLET_LENGTH 5
38#define MTOUCH_RESPONSE_BEGIN_BYTE 0x01
39#define MTOUCH_RESPONSE_END_BYTE 0x0d
40
41/* todo: check specs for max length of all responses */
42#define MTOUCH_MAX_LENGTH 16
43
44#define MTOUCH_MIN_XC 0
45#define MTOUCH_MAX_XC 0x3fff
46#define MTOUCH_MIN_YC 0
47#define MTOUCH_MAX_YC 0x3fff
48
49#define MTOUCH_GET_XC(data) (((data[2])<<7) | data[1])
50#define MTOUCH_GET_YC(data) (((data[4])<<7) | data[3])
51#define MTOUCH_GET_TOUCHED(data) (MTOUCH_FORMAT_TABLET_TOUCH_BIT & data[0])
52
53/*
54 * Per-touchscreen data.
55 */
56
57struct mtouch {
58 struct input_dev *dev;
59 struct serio *serio;
60 int idx;
61 unsigned char data[MTOUCH_MAX_LENGTH];
62 char phys[32];
63};
64
65static void mtouch_process_format_tablet(struct mtouch *mtouch)
66{
67 struct input_dev *dev = mtouch->dev;
68
69 if (MTOUCH_FORMAT_TABLET_LENGTH == ++mtouch->idx) {
70 input_report_abs(dev, ABS_X, MTOUCH_GET_XC(mtouch->data));
71 input_report_abs(dev, ABS_Y, MTOUCH_MAX_YC - MTOUCH_GET_YC(mtouch->data));
72 input_report_key(dev, BTN_TOUCH, MTOUCH_GET_TOUCHED(mtouch->data));
73 input_sync(dev);
74
75 mtouch->idx = 0;
76 }
77}
78
79static void mtouch_process_response(struct mtouch *mtouch)
80{
81 if (MTOUCH_RESPONSE_END_BYTE == mtouch->data[mtouch->idx++]) {
82 /* FIXME - process response */
83 mtouch->idx = 0;
84 } else if (MTOUCH_MAX_LENGTH == mtouch->idx) {
85 printk(KERN_ERR "mtouch.c: too many response bytes\n");
86 mtouch->idx = 0;
87 }
88}
89
90static irqreturn_t mtouch_interrupt(struct serio *serio,
91 unsigned char data, unsigned int flags)
92{
93 struct mtouch* mtouch = serio_get_drvdata(serio);
94
95 mtouch->data[mtouch->idx] = data;
96
97 if (MTOUCH_FORMAT_TABLET_STATUS_BIT & mtouch->data[0])
98 mtouch_process_format_tablet(mtouch);
99 else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0])
100 mtouch_process_response(mtouch);
101 else
102 printk(KERN_DEBUG "mtouch.c: unknown/unsynchronized data from device, byte %x\n",mtouch->data[0]);
103
104 return IRQ_HANDLED;
105}
106
107/*
108 * mtouch_disconnect() is the opposite of mtouch_connect()
109 */
110
111static void mtouch_disconnect(struct serio *serio)
112{
113 struct mtouch* mtouch = serio_get_drvdata(serio);
114
115 input_get_device(mtouch->dev);
116 input_unregister_device(mtouch->dev);
117 serio_close(serio);
118 serio_set_drvdata(serio, NULL);
119 input_put_device(mtouch->dev);
120 kfree(mtouch);
121}
122
123/*
124 * mtouch_connect() is the routine that is called when someone adds a
125 * new serio device that supports MicroTouch (Format Tablet) protocol and registers it as
126 * an input device.
127 */
128
129static int mtouch_connect(struct serio *serio, struct serio_driver *drv)
130{
131 struct mtouch *mtouch;
132 struct input_dev *input_dev;
133 int err;
134
135 mtouch = kzalloc(sizeof(struct mtouch), GFP_KERNEL);
136 input_dev = input_allocate_device();
137 if (!mtouch || !input_dev) {
138 err = -ENOMEM;
139 goto fail1;
140 }
141
142 mtouch->serio = serio;
143 mtouch->dev = input_dev;
144 snprintf(mtouch->phys, sizeof(mtouch->phys), "%s/input0", serio->phys);
145
146 input_dev->name = "MicroTouch Serial TouchScreen";
147 input_dev->phys = mtouch->phys;
148 input_dev->id.bustype = BUS_RS232;
149 input_dev->id.vendor = SERIO_MICROTOUCH;
150 input_dev->id.product = 0;
151 input_dev->id.version = 0x0100;
152 input_dev->dev.parent = &serio->dev;
153 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
154 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
155 input_set_abs_params(mtouch->dev, ABS_X, MTOUCH_MIN_XC, MTOUCH_MAX_XC, 0, 0);
156 input_set_abs_params(mtouch->dev, ABS_Y, MTOUCH_MIN_YC, MTOUCH_MAX_YC, 0, 0);
157
158 serio_set_drvdata(serio, mtouch);
159
160 err = serio_open(serio, drv);
161 if (err)
162 goto fail2;
163
164 err = input_register_device(mtouch->dev);
165 if (err)
166 goto fail3;
167
168 return 0;
169
170 fail3: serio_close(serio);
171 fail2: serio_set_drvdata(serio, NULL);
172 fail1: input_free_device(input_dev);
173 kfree(mtouch);
174 return err;
175}
176
177/*
178 * The serio driver structure.
179 */
180
181static struct serio_device_id mtouch_serio_ids[] = {
182 {
183 .type = SERIO_RS232,
184 .proto = SERIO_MICROTOUCH,
185 .id = SERIO_ANY,
186 .extra = SERIO_ANY,
187 },
188 { 0 }
189};
190
191MODULE_DEVICE_TABLE(serio, mtouch_serio_ids);
192
193static struct serio_driver mtouch_drv = {
194 .driver = {
195 .name = "mtouch",
196 },
197 .description = DRIVER_DESC,
198 .id_table = mtouch_serio_ids,
199 .interrupt = mtouch_interrupt,
200 .connect = mtouch_connect,
201 .disconnect = mtouch_disconnect,
202};
203
204module_serio_driver(mtouch_drv);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * MicroTouch (3M) serial touchscreen driver
4 *
5 * Copyright (c) 2004 Vojtech Pavlik
6 */
7
8
9/*
10 * 2005/02/19 Dan Streetman <ddstreet@ieee.org>
11 * Copied elo.c and edited for MicroTouch protocol
12 */
13
14#include <linux/errno.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/slab.h>
18#include <linux/input.h>
19#include <linux/serio.h>
20
21#define DRIVER_DESC "MicroTouch serial touchscreen driver"
22
23MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
24MODULE_DESCRIPTION(DRIVER_DESC);
25MODULE_LICENSE("GPL");
26
27/*
28 * Definitions & global arrays.
29 */
30
31#define MTOUCH_FORMAT_TABLET_STATUS_BIT 0x80
32#define MTOUCH_FORMAT_TABLET_TOUCH_BIT 0x40
33#define MTOUCH_FORMAT_TABLET_LENGTH 5
34#define MTOUCH_RESPONSE_BEGIN_BYTE 0x01
35#define MTOUCH_RESPONSE_END_BYTE 0x0d
36
37/* todo: check specs for max length of all responses */
38#define MTOUCH_MAX_LENGTH 16
39
40#define MTOUCH_MIN_XC 0
41#define MTOUCH_MAX_XC 0x3fff
42#define MTOUCH_MIN_YC 0
43#define MTOUCH_MAX_YC 0x3fff
44
45#define MTOUCH_GET_XC(data) (((data[2])<<7) | data[1])
46#define MTOUCH_GET_YC(data) (((data[4])<<7) | data[3])
47#define MTOUCH_GET_TOUCHED(data) (MTOUCH_FORMAT_TABLET_TOUCH_BIT & data[0])
48
49/*
50 * Per-touchscreen data.
51 */
52
53struct mtouch {
54 struct input_dev *dev;
55 struct serio *serio;
56 int idx;
57 unsigned char data[MTOUCH_MAX_LENGTH];
58 char phys[32];
59};
60
61static void mtouch_process_format_tablet(struct mtouch *mtouch)
62{
63 struct input_dev *dev = mtouch->dev;
64
65 if (MTOUCH_FORMAT_TABLET_LENGTH == ++mtouch->idx) {
66 input_report_abs(dev, ABS_X, MTOUCH_GET_XC(mtouch->data));
67 input_report_abs(dev, ABS_Y, MTOUCH_MAX_YC - MTOUCH_GET_YC(mtouch->data));
68 input_report_key(dev, BTN_TOUCH, MTOUCH_GET_TOUCHED(mtouch->data));
69 input_sync(dev);
70
71 mtouch->idx = 0;
72 }
73}
74
75static void mtouch_process_response(struct mtouch *mtouch)
76{
77 if (MTOUCH_RESPONSE_END_BYTE == mtouch->data[mtouch->idx++]) {
78 /* FIXME - process response */
79 mtouch->idx = 0;
80 } else if (MTOUCH_MAX_LENGTH == mtouch->idx) {
81 printk(KERN_ERR "mtouch.c: too many response bytes\n");
82 mtouch->idx = 0;
83 }
84}
85
86static irqreturn_t mtouch_interrupt(struct serio *serio,
87 unsigned char data, unsigned int flags)
88{
89 struct mtouch *mtouch = serio_get_drvdata(serio);
90
91 mtouch->data[mtouch->idx] = data;
92
93 if (MTOUCH_FORMAT_TABLET_STATUS_BIT & mtouch->data[0])
94 mtouch_process_format_tablet(mtouch);
95 else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0])
96 mtouch_process_response(mtouch);
97 else
98 printk(KERN_DEBUG "mtouch.c: unknown/unsynchronized data from device, byte %x\n",mtouch->data[0]);
99
100 return IRQ_HANDLED;
101}
102
103/*
104 * mtouch_disconnect() is the opposite of mtouch_connect()
105 */
106
107static void mtouch_disconnect(struct serio *serio)
108{
109 struct mtouch *mtouch = serio_get_drvdata(serio);
110
111 input_get_device(mtouch->dev);
112 input_unregister_device(mtouch->dev);
113 serio_close(serio);
114 serio_set_drvdata(serio, NULL);
115 input_put_device(mtouch->dev);
116 kfree(mtouch);
117}
118
119/*
120 * mtouch_connect() is the routine that is called when someone adds a
121 * new serio device that supports MicroTouch (Format Tablet) protocol and registers it as
122 * an input device.
123 */
124
125static int mtouch_connect(struct serio *serio, struct serio_driver *drv)
126{
127 struct mtouch *mtouch;
128 struct input_dev *input_dev;
129 int err;
130
131 mtouch = kzalloc(sizeof(struct mtouch), GFP_KERNEL);
132 input_dev = input_allocate_device();
133 if (!mtouch || !input_dev) {
134 err = -ENOMEM;
135 goto fail1;
136 }
137
138 mtouch->serio = serio;
139 mtouch->dev = input_dev;
140 snprintf(mtouch->phys, sizeof(mtouch->phys), "%s/input0", serio->phys);
141
142 input_dev->name = "MicroTouch Serial TouchScreen";
143 input_dev->phys = mtouch->phys;
144 input_dev->id.bustype = BUS_RS232;
145 input_dev->id.vendor = SERIO_MICROTOUCH;
146 input_dev->id.product = 0;
147 input_dev->id.version = 0x0100;
148 input_dev->dev.parent = &serio->dev;
149 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
150 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
151 input_set_abs_params(mtouch->dev, ABS_X, MTOUCH_MIN_XC, MTOUCH_MAX_XC, 0, 0);
152 input_set_abs_params(mtouch->dev, ABS_Y, MTOUCH_MIN_YC, MTOUCH_MAX_YC, 0, 0);
153
154 serio_set_drvdata(serio, mtouch);
155
156 err = serio_open(serio, drv);
157 if (err)
158 goto fail2;
159
160 err = input_register_device(mtouch->dev);
161 if (err)
162 goto fail3;
163
164 return 0;
165
166 fail3: serio_close(serio);
167 fail2: serio_set_drvdata(serio, NULL);
168 fail1: input_free_device(input_dev);
169 kfree(mtouch);
170 return err;
171}
172
173/*
174 * The serio driver structure.
175 */
176
177static const struct serio_device_id mtouch_serio_ids[] = {
178 {
179 .type = SERIO_RS232,
180 .proto = SERIO_MICROTOUCH,
181 .id = SERIO_ANY,
182 .extra = SERIO_ANY,
183 },
184 { 0 }
185};
186
187MODULE_DEVICE_TABLE(serio, mtouch_serio_ids);
188
189static struct serio_driver mtouch_drv = {
190 .driver = {
191 .name = "mtouch",
192 },
193 .description = DRIVER_DESC,
194 .id_table = mtouch_serio_ids,
195 .interrupt = mtouch_interrupt,
196 .connect = mtouch_connect,
197 .disconnect = mtouch_disconnect,
198};
199
200module_serio_driver(mtouch_drv);