1 /*
2 * $Id: sermouse.c,v 1.17 2002/03/13 10:03:43 vojtech 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
25 *
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 <linux/delay.h>
32 #include <linux/module.h>
33 #include <linux/slab.h>
34 #include <linux/interrupt.h>
35 #include <linux/input.h>
36 #include <linux/config.h>
37 #include <linux/serio.h>
38 #include <linux/init.h>
39
40 #define DRIVER_DESC "Serial mouse driver"
41
42 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
43 MODULE_DESCRIPTION(DRIVER_DESC);
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(jiffies, sermouse->last + HZ/10)) sermouse->count = 0;
215 sermouse->last = jiffies;
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_driver *drv)
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 sprintf(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 sermouse->dev.dev = &serio->dev;
284
285 if (serio_open(serio, drv)) {
286 kfree(sermouse);
287 return;
288 }
289
290 input_register_device(&sermouse->dev);
291
292 printk(KERN_INFO "input: %s on %s\n", sermouse_protocols[sermouse->type], serio->phys);
293 }
294
295 static struct serio_driver sermouse_drv = {
296 .driver = {
297 .name = "sermouse",
298 },
299 .description = DRIVER_DESC,
300 .interrupt = sermouse_interrupt,
301 .connect = sermouse_connect,
302 .disconnect = sermouse_disconnect,
303 };
304
305 int __init sermouse_init(void)
306 {
307 serio_register_driver(&sermouse_drv);
308 return 0;
309 }
310
311 void __exit sermouse_exit(void)
312 {
313 serio_unregister_driver(&sermouse_drv);
314 }
315
316 module_init(sermouse_init);
317 module_exit(sermouse_exit);
318
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