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494 giacomo 1
/*
2
 * $Id: sermouse.c,v 1.1 2004-03-08 18:47:40 giacomo Exp $
3
 *
4
 *  Copyright (c) 1999-2001 Vojtech Pavlik
5
 */
6
 
7
/*
8
 *  Serial mouse driver for Linux
9
 */
10
 
11
/*
12
 * This program is free software; you can redistribute it and/or modify
13
 * it under the terms of the GNU General Public License as published by
14
 * the Free Software Foundation; either version 2 of the License, or
15
 * (at your option) any later version.
16
 *
17
 * This program is distributed in the hope that it will be useful,
18
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20
 * GNU General Public License for more details.
21
 *
22
 * You should have received a copy of the GNU General Public License
23
 * along with this program; if not, write to the Free Software
24
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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 *
26
 * Should you need to contact me, the author, you can do so either by
27
 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
28
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
29
 */
30
 
31
#include <linuxcomp.h>
32
 
33
#include <linux/delay.h>
34
#include <linux/module.h>
35
#include <linux/slab.h>
36
#include <linux/interrupt.h>
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#include <linux/input.h>
38
#include <linux/config.h>
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#include <linux/serio.h>
40
#include <linux/init.h>
41
 
42
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
43
MODULE_DESCRIPTION("Serial mouse driver");
44
MODULE_LICENSE("GPL");
45
 
46
static char *sermouse_protocols[] = { "None", "Mouse Systems Mouse", "Sun Mouse", "Microsoft Mouse",
47
                                        "Logitech M+ Mouse", "Microsoft MZ Mouse", "Logitech MZ+ Mouse",
48
                                        "Logitech MZ++ Mouse"};
49
 
50
struct sermouse {
51
        struct input_dev dev;
52
        signed char buf[8];
53
        unsigned char count;
54
        unsigned char type;
55
        unsigned long last;
56
        char phys[32];
57
};
58
 
59
/*
60
 * sermouse_process_msc() analyzes the incoming MSC/Sun bytestream and
61
 * applies some prediction to the data, resulting in 96 updates per
62
 * second, which is as good as a PS/2 or USB mouse.
63
 */
64
 
65
static void sermouse_process_msc(struct sermouse *sermouse, signed char data, struct pt_regs *regs)
66
{
67
        struct input_dev *dev = &sermouse->dev;
68
        signed char *buf = sermouse->buf;
69
 
70
        input_regs(dev, regs);
71
 
72
        switch (sermouse->count) {
73
 
74
                case 0:
75
                        if ((data & 0xf8) != 0x80) return;
76
                        input_report_key(dev, BTN_LEFT,   !(data & 4));
77
                        input_report_key(dev, BTN_RIGHT,  !(data & 1));
78
                        input_report_key(dev, BTN_MIDDLE, !(data & 2));
79
                        break;
80
 
81
                case 1:
82
                case 3:
83
                        input_report_rel(dev, REL_X, data / 2);
84
                        input_report_rel(dev, REL_Y, -buf[1]);
85
                        buf[0] = data - data / 2;
86
                        break;
87
 
88
                case 2:
89
                case 4:
90
                        input_report_rel(dev, REL_X, buf[0]);
91
                        input_report_rel(dev, REL_Y, buf[1] - data);
92
                        buf[1] = data / 2;
93
                        break;
94
        }
95
 
96
        input_sync(dev);
97
 
98
        if (++sermouse->count == (5 - ((sermouse->type == SERIO_SUN) << 1)))
99
                sermouse->count = 0;
100
}
101
 
102
/*
103
 * sermouse_process_ms() anlyzes the incoming MS(Z/+/++) bytestream and
104
 * generates events. With prediction it gets 80 updates/sec, assuming
105
 * standard 3-byte packets and 1200 bps.
106
 */
107
 
108
static void sermouse_process_ms(struct sermouse *sermouse, signed char data, struct pt_regs *regs)
109
{
110
        struct input_dev *dev = &sermouse->dev;
111
        signed char *buf = sermouse->buf;
112
 
113
        if (data & 0x40) sermouse->count = 0;
114
 
115
        input_regs(dev, regs);
116
 
117
        switch (sermouse->count) {
118
 
119
                case 0:
120
                        buf[1] = data;
121
                        input_report_key(dev, BTN_LEFT,   (data >> 5) & 1);
122
                        input_report_key(dev, BTN_RIGHT,  (data >> 4) & 1);
123
                        break;
124
 
125
                case 1:
126
                        buf[2] = data;
127
                        data = (signed char) (((buf[1] << 6) & 0xc0) | (data & 0x3f));
128
                        input_report_rel(dev, REL_X, data / 2);
129
                        input_report_rel(dev, REL_Y, buf[4]);
130
                        buf[3] = data - data / 2;
131
                        break;
132
 
133
                case 2:
134
                        /* Guessing the state of the middle button on 3-button MS-protocol mice - ugly. */
135
                        if ((sermouse->type == SERIO_MS) && !data && !buf[2] && !((buf[0] & 0xf0) ^ buf[1]))
136
                                input_report_key(dev, BTN_MIDDLE, !test_bit(BTN_MIDDLE, dev->key));
137
                        buf[0] = buf[1];
138
 
139
                        data = (signed char) (((buf[1] << 4) & 0xc0) | (data & 0x3f));
140
                        input_report_rel(dev, REL_X, buf[3]);
141
                        input_report_rel(dev, REL_Y, data - buf[4]);
142
                        buf[4] = data / 2;
143
                        break;
144
 
145
                case 3:
146
 
147
                        switch (sermouse->type) {
148
 
149
                                case SERIO_MS:
150
                                         sermouse->type = SERIO_MP;
151
 
152
                                case SERIO_MP:
153
                                        if ((data >> 2) & 3) break;     /* M++ Wireless Extension packet. */
154
                                        input_report_key(dev, BTN_MIDDLE, (data >> 5) & 1);
155
                                        input_report_key(dev, BTN_SIDE,   (data >> 4) & 1);
156
                                        break;
157
 
158
                                case SERIO_MZP:
159
                                case SERIO_MZPP:
160
                                        input_report_key(dev, BTN_SIDE,   (data >> 5) & 1);
161
 
162
                                case SERIO_MZ:
163
                                        input_report_key(dev, BTN_MIDDLE, (data >> 4) & 1);
164
                                        input_report_rel(dev, REL_WHEEL,  (data & 8) - (data & 7));
165
                                        break;
166
                        }
167
 
168
                        break;
169
 
170
                case 4:
171
                case 6: /* MZ++ packet type. We can get these bytes for M++ too but we ignore them later. */
172
                        buf[1] = (data >> 2) & 0x0f;
173
                        break;
174
 
175
                case 5:
176
                case 7: /* Ignore anything besides MZ++ */
177
                        if (sermouse->type != SERIO_MZPP) break;
178
 
179
                        switch (buf[1]) {
180
 
181
                                case 1: /* Extra mouse info */
182
 
183
                                        input_report_key(dev, BTN_SIDE, (data >> 4) & 1);
184
                                        input_report_key(dev, BTN_EXTRA, (data >> 5) & 1);
185
                                        input_report_rel(dev, data & 0x80 ? REL_HWHEEL : REL_WHEEL, (data & 7) - (data & 8));
186
 
187
                                        break;
188
 
189
                                default: /* We don't decode anything else yet. */
190
 
191
                                        printk(KERN_WARNING
192
                                                "sermouse.c: Received MZ++ packet %x, don't know how to handle.\n", buf[1]);
193
                                        break;
194
                        }
195
 
196
                        break;
197
        }
198
 
199
        input_sync(dev);
200
 
201
        sermouse->count++;
202
}
203
 
204
/*
205
 * sermouse_interrupt() handles incoming characters, either gathering them into
206
 * packets or passing them to the command routine as command output.
207
 */
208
 
209
static irqreturn_t sermouse_interrupt(struct serio *serio,
210
                unsigned char data, unsigned int flags, struct pt_regs *regs)
211
{
212
        struct sermouse *sermouse = serio->private;
213
 
214
        if (time_after(jiffies26, sermouse->last + HZ/10)) sermouse->count = 0;
215
        sermouse->last = jiffies26;
216
 
217
        if (sermouse->type > SERIO_SUN)
218
                sermouse_process_ms(sermouse, data, regs);
219
        else
220
                sermouse_process_msc(sermouse, data, regs);
221
        return IRQ_HANDLED;
222
}
223
 
224
/*
225
 * sermouse_disconnect() cleans up after we don't want talk
226
 * to the mouse anymore.
227
 */
228
 
229
static void sermouse_disconnect(struct serio *serio)
230
{
231
        struct sermouse *sermouse = serio->private;
232
        input_unregister_device(&sermouse->dev);
233
        serio_close(serio);
234
        kfree(sermouse);
235
}
236
 
237
/*
238
 * sermouse_connect() is a callback form the serio module when
239
 * an unhandled serio port is found.
240
 */
241
 
242
static void sermouse_connect(struct serio *serio, struct serio_dev *dev)
243
{
244
        struct sermouse *sermouse;
245
        unsigned char c;
246
 
247
        if ((serio->type & SERIO_TYPE) != SERIO_RS232)
248
                return;
249
 
250
        if (!(serio->type & SERIO_PROTO) || ((serio->type & SERIO_PROTO) > SERIO_MZPP))
251
                return;
252
 
253
        if (!(sermouse = kmalloc(sizeof(struct sermouse), GFP_KERNEL)))
254
                return;
255
 
256
        memset(sermouse, 0, sizeof(struct sermouse));
257
 
258
        init_input_dev(&sermouse->dev);
259
        sermouse->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
260
        sermouse->dev.keybit[LONG(BTN_MOUSE)] = BIT(BTN_LEFT) | BIT(BTN_RIGHT);
261
        sermouse->dev.relbit[0] = BIT(REL_X) | BIT(REL_Y);
262
        sermouse->dev.private = sermouse;
263
 
264
        serio->private = sermouse;
265
 
266
        sermouse->type = serio->type & SERIO_PROTO;
267
        c = (serio->type & SERIO_EXTRA) >> 16;
268
 
269
        if (c & 0x01) set_bit(BTN_MIDDLE, sermouse->dev.keybit);
270
        if (c & 0x02) set_bit(BTN_SIDE, sermouse->dev.keybit);
271
        if (c & 0x04) set_bit(BTN_EXTRA, sermouse->dev.keybit);
272
        if (c & 0x10) set_bit(REL_WHEEL, sermouse->dev.relbit);
273
        if (c & 0x20) set_bit(REL_HWHEEL, sermouse->dev.relbit);
274
 
275
        sprintf26(sermouse->phys, "%s/input0", serio->phys);
276
 
277
        sermouse->dev.name = sermouse_protocols[sermouse->type];
278
        sermouse->dev.phys = sermouse->phys;
279
        sermouse->dev.id.bustype = BUS_RS232;
280
        sermouse->dev.id.vendor = sermouse->type;
281
        sermouse->dev.id.product = c;
282
        sermouse->dev.id.version = 0x0100;
283
 
284
        if (serio_open(serio, dev)) {
285
                kfree(sermouse);
286
                return;
287
        }
288
 
289
        input_register_device(&sermouse->dev);
290
 
291
        printk(KERN_INFO "input: %s on %s\n", sermouse_protocols[sermouse->type], serio->phys);
292
}
293
 
294
static struct serio_dev sermouse_dev = {
295
        .interrupt =    sermouse_interrupt,
296
        .connect =      sermouse_connect,
297
        .disconnect =   sermouse_disconnect
298
};
299
 
300
int __init sermouse_init(void)
301
{
302
        serio_register_device(&sermouse_dev);
303
        return 0;
304
}
305
 
306
void __exit sermouse_exit(void)
307
{
308
        serio_unregister_device(&sermouse_dev);
309
}
310
 
311
module_init(sermouse_init);
312
module_exit(sermouse_exit);