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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#include <linux/init.h>
25
26#define DRIVER_DESC "MicroTouch serial touchscreen driver"
27
28MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
29MODULE_DESCRIPTION(DRIVER_DESC);
30MODULE_LICENSE("GPL");
31
32/*
33 * Definitions & global arrays.
34 */
35
36#define MTOUCH_FORMAT_TABLET_STATUS_BIT 0x80
37#define MTOUCH_FORMAT_TABLET_TOUCH_BIT 0x40
38#define MTOUCH_FORMAT_TABLET_LENGTH 5
39#define MTOUCH_RESPONSE_BEGIN_BYTE 0x01
40#define MTOUCH_RESPONSE_END_BYTE 0x0d
41
42/* todo: check specs for max length of all responses */
43#define MTOUCH_MAX_LENGTH 16
44
45#define MTOUCH_MIN_XC 0
46#define MTOUCH_MAX_XC 0x3fff
47#define MTOUCH_MIN_YC 0
48#define MTOUCH_MAX_YC 0x3fff
49
50#define MTOUCH_GET_XC(data) (((data[2])<<7) | data[1])
51#define MTOUCH_GET_YC(data) (((data[4])<<7) | data[3])
52#define MTOUCH_GET_TOUCHED(data) (MTOUCH_FORMAT_TABLET_TOUCH_BIT & data[0])
53
54/*
55 * Per-touchscreen data.
56 */
57
58struct mtouch {
59 struct input_dev *dev;
60 struct serio *serio;
61 int idx;
62 unsigned char data[MTOUCH_MAX_LENGTH];
63 char phys[32];
64};
65
66static void mtouch_process_format_tablet(struct mtouch *mtouch)
67{
68 struct input_dev *dev = mtouch->dev;
69
70 if (MTOUCH_FORMAT_TABLET_LENGTH == ++mtouch->idx) {
71 input_report_abs(dev, ABS_X, MTOUCH_GET_XC(mtouch->data));
72 input_report_abs(dev, ABS_Y, MTOUCH_MAX_YC - MTOUCH_GET_YC(mtouch->data));
73 input_report_key(dev, BTN_TOUCH, MTOUCH_GET_TOUCHED(mtouch->data));
74 input_sync(dev);
75
76 mtouch->idx = 0;
77 }
78}
79
80static void mtouch_process_response(struct mtouch *mtouch)
81{
82 if (MTOUCH_RESPONSE_END_BYTE == mtouch->data[mtouch->idx++]) {
83 /* FIXME - process response */
84 mtouch->idx = 0;
85 } else if (MTOUCH_MAX_LENGTH == mtouch->idx) {
86 printk(KERN_ERR "mtouch.c: too many response bytes\n");
87 mtouch->idx = 0;
88 }
89}
90
91static irqreturn_t mtouch_interrupt(struct serio *serio,
92 unsigned char data, unsigned int flags)
93{
94 struct mtouch* mtouch = serio_get_drvdata(serio);
95
96 mtouch->data[mtouch->idx] = data;
97
98 if (MTOUCH_FORMAT_TABLET_STATUS_BIT & mtouch->data[0])
99 mtouch_process_format_tablet(mtouch);
100 else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0])
101 mtouch_process_response(mtouch);
102 else
103 printk(KERN_DEBUG "mtouch.c: unknown/unsynchronized data from device, byte %x\n",mtouch->data[0]);
104
105 return IRQ_HANDLED;
106}
107
108/*
109 * mtouch_disconnect() is the opposite of mtouch_connect()
110 */
111
112static void mtouch_disconnect(struct serio *serio)
113{
114 struct mtouch* mtouch = serio_get_drvdata(serio);
115
116 input_get_device(mtouch->dev);
117 input_unregister_device(mtouch->dev);
118 serio_close(serio);
119 serio_set_drvdata(serio, NULL);
120 input_put_device(mtouch->dev);
121 kfree(mtouch);
122}
123
124/*
125 * mtouch_connect() is the routine that is called when someone adds a
126 * new serio device that supports MicroTouch (Format Tablet) protocol and registers it as
127 * an input device.
128 */
129
130static int mtouch_connect(struct serio *serio, struct serio_driver *drv)
131{
132 struct mtouch *mtouch;
133 struct input_dev *input_dev;
134 int err;
135
136 mtouch = kzalloc(sizeof(struct mtouch), GFP_KERNEL);
137 input_dev = input_allocate_device();
138 if (!mtouch || !input_dev) {
139 err = -ENOMEM;
140 goto fail1;
141 }
142
143 mtouch->serio = serio;
144 mtouch->dev = input_dev;
145 snprintf(mtouch->phys, sizeof(mtouch->phys), "%s/input0", serio->phys);
146
147 input_dev->name = "MicroTouch Serial TouchScreen";
148 input_dev->phys = mtouch->phys;
149 input_dev->id.bustype = BUS_RS232;
150 input_dev->id.vendor = SERIO_MICROTOUCH;
151 input_dev->id.product = 0;
152 input_dev->id.version = 0x0100;
153 input_dev->dev.parent = &serio->dev;
154 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
155 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
156 input_set_abs_params(mtouch->dev, ABS_X, MTOUCH_MIN_XC, MTOUCH_MAX_XC, 0, 0);
157 input_set_abs_params(mtouch->dev, ABS_Y, MTOUCH_MIN_YC, MTOUCH_MAX_YC, 0, 0);
158
159 serio_set_drvdata(serio, mtouch);
160
161 err = serio_open(serio, drv);
162 if (err)
163 goto fail2;
164
165 err = input_register_device(mtouch->dev);
166 if (err)
167 goto fail3;
168
169 return 0;
170
171 fail3: serio_close(serio);
172 fail2: serio_set_drvdata(serio, NULL);
173 fail1: input_free_device(input_dev);
174 kfree(mtouch);
175 return err;
176}
177
178/*
179 * The serio driver structure.
180 */
181
182static struct serio_device_id mtouch_serio_ids[] = {
183 {
184 .type = SERIO_RS232,
185 .proto = SERIO_MICROTOUCH,
186 .id = SERIO_ANY,
187 .extra = SERIO_ANY,
188 },
189 { 0 }
190};
191
192MODULE_DEVICE_TABLE(serio, mtouch_serio_ids);
193
194static struct serio_driver mtouch_drv = {
195 .driver = {
196 .name = "mtouch",
197 },
198 .description = DRIVER_DESC,
199 .id_table = mtouch_serio_ids,
200 .interrupt = mtouch_interrupt,
201 .connect = mtouch_connect,
202 .disconnect = mtouch_disconnect,
203};
204
205/*
206 * The functions for inserting/removing us as a module.
207 */
208
209static int __init mtouch_init(void)
210{
211 return serio_register_driver(&mtouch_drv);
212}
213
214static void __exit mtouch_exit(void)
215{
216 serio_unregister_driver(&mtouch_drv);
217}
218
219module_init(mtouch_init);
220module_exit(mtouch_exit);
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);