1 /*
2 * $Id: grip.c,v 1.21 2002/01/22 20:27:57 vojtech Exp $
3 *
4 * Copyright (c) 1998-2001 Vojtech Pavlik
5 */
6
7 /*
8 * Gravis/Kensington GrIP protocol joystick and gamepad 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/kernel.h>
32 #include <linux/module.h>
33 #include <linux/init.h>
34 #include <linux/slab.h>
35 #include <linux/gameport.h>
36 #include <linux/input.h>
37
38 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
39 MODULE_DESCRIPTION("Gravis GrIP protocol joystick driver");
40 MODULE_LICENSE("GPL");
41
42 #define GRIP_MODE_GPP 1
43 #define GRIP_MODE_BD 2
44 #define GRIP_MODE_XT 3
45 #define GRIP_MODE_DC 4
46
47 #define GRIP_LENGTH_GPP 24
48 #define GRIP_STROBE_GPP 200 /* 200 us */
49 #define GRIP_LENGTH_XT 4
50 #define GRIP_STROBE_XT 64 /* 64 us */
51 #define GRIP_MAX_CHUNKS_XT 10
52 #define GRIP_MAX_BITS_XT 30
53
54 #define GRIP_REFRESH_TIME HZ/50 /* 20 ms */
55
56 struct grip {
57 struct gameport *gameport;
58 struct timer_list timer;
59 struct input_dev dev[2];
60 unsigned char mode[2];
61 int used;
62 int reads;
63 int bads;
64 char phys[2][32];
65 };
66
67 static int grip_btn_gpp[] = { BTN_START, BTN_SELECT, BTN_TR2, BTN_Y, 0, BTN_TL2, BTN_A, BTN_B, BTN_X, 0, BTN_TL, BTN_TR, -1 };
68 static int grip_btn_bd[] = { BTN_THUMB, BTN_THUMB2, BTN_TRIGGER, BTN_TOP, BTN_BASE, -1 };
69 static int grip_btn_xt[] = { BTN_TRIGGER, BTN_THUMB, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_SELECT, BTN_START, BTN_MODE, -1 };
70 static int grip_btn_dc[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_BASE5, -1 };
71
72 static int grip_abs_gpp[] = { ABS_X, ABS_Y, -1 };
73 static int grip_abs_bd[] = { ABS_X, ABS_Y, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };
74 static int grip_abs_xt[] = { ABS_X, ABS_Y, ABS_BRAKE, ABS_GAS, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, -1 };
75 static int grip_abs_dc[] = { ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };
76
77 static char *grip_name[] = { NULL, "Gravis GamePad Pro", "Gravis Blackhawk Digital",
78 "Gravis Xterminator Digital", "Gravis Xterminator DualControl" };
79 static int *grip_abs[] = { NULL, grip_abs_gpp, grip_abs_bd, grip_abs_xt, grip_abs_dc };
80 static int *grip_btn[] = { NULL, grip_btn_gpp, grip_btn_bd, grip_btn_xt, grip_btn_dc };
81 static char grip_anx[] = { 0, 0, 3, 5, 5 };
82 static char grip_cen[] = { 0, 0, 2, 2, 4 };
83
84 /*
85 * grip_gpp_read_packet() reads a Gravis GamePad Pro packet.
86 */
87
88 static int grip_gpp_read_packet(struct gameport *gameport, int shift, unsigned int *data)
89 {
90 unsigned long flags;
91 unsigned char u, v;
92 unsigned int t;
93 int i;
94
95 int strobe = gameport_time(gameport, GRIP_STROBE_GPP);
96
97 data[0] = 0;
98 t = strobe;
99 i = 0;
100
101 local_irq_save(flags);
102
103 v = gameport_read(gameport) >> shift;
104
105 do {
106 t--;
107 u = v; v = (gameport_read(gameport) >> shift) & 3;
108 if (~v & u & 1) {
109 data[0] |= (v >> 1) << i++;
110 t = strobe;
111 }
112 } while (i < GRIP_LENGTH_GPP && t > 0);
113
114 local_irq_restore(flags);
115
116 if (i < GRIP_LENGTH_GPP) return -1;
117
118 for (i = 0; i < GRIP_LENGTH_GPP && (data[0] & 0xfe4210) ^ 0x7c0000; i++)
119 data[0] = data[0] >> 1 | (data[0] & 1) << (GRIP_LENGTH_GPP - 1);
120
121 return -(i == GRIP_LENGTH_GPP);
122 }
123
124 /*
125 * grip_xt_read_packet() reads a Gravis Xterminator packet.
126 */
127
128 static int grip_xt_read_packet(struct gameport *gameport, int shift, unsigned int *data)
129 {
130 unsigned int i, j, buf, crc;
131 unsigned char u, v, w;
132 unsigned long flags;
133 unsigned int t;
134 char status;
135
136 int strobe = gameport_time(gameport, GRIP_STROBE_XT);
137
138 data[0] = data[1] = data[2] = data[3] = 0;
139 status = buf = i = j = 0;
140 t = strobe;
141
142 local_irq_save(flags);
143
144 v = w = (gameport_read(gameport) >> shift) & 3;
145
146 do {
147 t--;
148 u = (gameport_read(gameport) >> shift) & 3;
149
150 if (u ^ v) {
151
152 if ((u ^ v) & 1) {
153 buf = (buf << 1) | (u >> 1);
154 t = strobe;
155 i++;
156 } else
157
158 if ((((u ^ v) & (v ^ w)) >> 1) & ~(u | v | w) & 1) {
159 if (i == 20) {
160 crc = buf ^ (buf >> 7) ^ (buf >> 14);
161 if (!((crc ^ (0x25cb9e70 >> ((crc >> 2) & 0x1c))) & 0xf)) {
162 data[buf >> 18] = buf >> 4;
163 status |= 1 << (buf >> 18);
164 }
165 j++;
166 }
167 t = strobe;
168 buf = 0;
169 i = 0;
170 }
171 w = v;
172 v = u;
173 }
174
175 } while (status != 0xf && i < GRIP_MAX_BITS_XT && j < GRIP_MAX_CHUNKS_XT && t > 0);
176
177 local_irq_restore(flags);
178
179 return -(status != 0xf);
180 }
181
182 /*
183 * grip_timer() repeatedly polls the joysticks and generates events.
184 */
185
186 static void grip_timer(unsigned long private)
187 {
188 struct grip *grip = (void*) private;
189 unsigned int data[GRIP_LENGTH_XT];
190 struct input_dev *dev;
191 int i, j;
192
193 for (i = 0; i < 2; i++) {
194
195 dev = grip->dev + i;
196 grip->reads++;
197
198 switch (grip->mode[i]) {
199
200 case GRIP_MODE_GPP:
201
202 if (grip_gpp_read_packet(grip->gameport, (i << 1) + 4, data)) {
203 grip->bads++;
204 break;
205 }
206
207 input_report_abs(dev, ABS_X, ((*data >> 15) & 1) - ((*data >> 16) & 1));
208 input_report_abs(dev, ABS_Y, ((*data >> 13) & 1) - ((*data >> 12) & 1));
209
210 for (j = 0; j < 12; j++)
211 if (grip_btn_gpp[j])
212 input_report_key(dev, grip_btn_gpp[j], (*data >> j) & 1);
213
214 break;
215
216 case GRIP_MODE_BD:
217
218 if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) {
219 grip->bads++;
220 break;
221 }
222
223 input_report_abs(dev, ABS_X, (data[0] >> 2) & 0x3f);
224 input_report_abs(dev, ABS_Y, 63 - ((data[0] >> 8) & 0x3f));
225 input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f);
226
227 input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2] & 1));
228 input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1));
229
230 for (j = 0; j < 5; j++)
231 input_report_key(dev, grip_btn_bd[j], (data[3] >> (j + 4)) & 1);
232
233 break;
234
235 case GRIP_MODE_XT:
236
237 if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) {
238 grip->bads++;
239 break;
240 }
241
242 input_report_abs(dev, ABS_X, (data[0] >> 2) & 0x3f);
243 input_report_abs(dev, ABS_Y, 63 - ((data[0] >> 8) & 0x3f));
244 input_report_abs(dev, ABS_BRAKE, (data[1] >> 2) & 0x3f);
245 input_report_abs(dev, ABS_GAS, (data[1] >> 8) & 0x3f);
246 input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f);
247
248 input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2] & 1));
249 input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1));
250 input_report_abs(dev, ABS_HAT1X, ((data[2] >> 5) & 1) - ((data[2] >> 4) & 1));
251 input_report_abs(dev, ABS_HAT1Y, ((data[2] >> 6) & 1) - ((data[2] >> 7) & 1));
252
253 for (j = 0; j < 11; j++)
254 input_report_key(dev, grip_btn_xt[j], (data[3] >> (j + 3)) & 1);
255 break;
256
257 case GRIP_MODE_DC:
258
259 if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) {
260 grip->bads++;
261 break;
262 }
263
264 input_report_abs(dev, ABS_X, (data[0] >> 2) & 0x3f);
265 input_report_abs(dev, ABS_Y, (data[0] >> 8) & 0x3f);
266 input_report_abs(dev, ABS_RX, (data[1] >> 2) & 0x3f);
267 input_report_abs(dev, ABS_RY, (data[1] >> 8) & 0x3f);
268 input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f);
269
270 input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2] & 1));
271 input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1));
272
273 for (j = 0; j < 9; j++)
274 input_report_key(dev, grip_btn_dc[j], (data[3] >> (j + 3)) & 1);
275 break;
276
277
278 }
279
280 input_sync(dev);
281 }
282
283 mod_timer(&grip->timer, jiffies + GRIP_REFRESH_TIME);
284 }
285
286 static int grip_open(struct input_dev *dev)
287 {
288 struct grip *grip = dev->private;
289 if (!grip->used++)
290 mod_timer(&grip->timer, jiffies + GRIP_REFRESH_TIME);
291 return 0;
292 }
293
294 static void grip_close(struct input_dev *dev)
295 {
296 struct grip *grip = dev->private;
297 if (!--grip->used)
298 del_timer(&grip->timer);
299 }
300
301 static void grip_connect(struct gameport *gameport, struct gameport_dev *dev)
302 {
303 struct grip *grip;
304 unsigned int data[GRIP_LENGTH_XT];
305 int i, j, t;
306
307 if (!(grip = kmalloc(sizeof(struct grip), GFP_KERNEL)))
308 return;
309 memset(grip, 0, sizeof(struct grip));
310
311 gameport->private = grip;
312
313 grip->gameport = gameport;
314 init_timer(&grip->timer);
315 grip->timer.data = (long) grip;
316 grip->timer.function = grip_timer;
317
318 if (gameport_open(gameport, dev, GAMEPORT_MODE_RAW))
319 goto fail1;
320
321 for (i = 0; i < 2; i++) {
322 if (!grip_gpp_read_packet(gameport, (i << 1) + 4, data)) {
323 grip->mode[i] = GRIP_MODE_GPP;
324 continue;
325 }
326 if (!grip_xt_read_packet(gameport, (i << 1) + 4, data)) {
327 if (!(data[3] & 7)) {
328 grip->mode[i] = GRIP_MODE_BD;
329 continue;
330 }
331 if (!(data[2] & 0xf0)) {
332 grip->mode[i] = GRIP_MODE_XT;
333 continue;
334 }
335 grip->mode[i] = GRIP_MODE_DC;
336 continue;
337 }
338 }
339
340 if (!grip->mode[0] && !grip->mode[1])
341 goto fail2;
342
343 for (i = 0; i < 2; i++)
344 if (grip->mode[i]) {
345
346 sprintf(grip->phys[i], "%s/input%d", gameport->phys, i);
347
348 grip->dev[i].private = grip;
349
350 grip->dev[i].open = grip_open;
351 grip->dev[i].close = grip_close;
352
353 grip->dev[i].name = grip_name[grip->mode[i]];
354 grip->dev[i].phys = grip->phys[i];
355 grip->dev[i].id.bustype = BUS_GAMEPORT;
356 grip->dev[i].id.vendor = GAMEPORT_ID_VENDOR_GRAVIS;
357 grip->dev[i].id.product = grip->mode[i];
358 grip->dev[i].id.version = 0x0100;
359
360 grip->dev[i].evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
361
362 for (j = 0; (t = grip_abs[grip->mode[i]][j]) >= 0; j++) {
363
364 set_bit(t, grip->dev[i].absbit);
365
366 if (j < grip_cen[grip->mode[i]]) {
367 grip->dev[i].absmin[t] = 14;
368 grip->dev[i].absmax[t] = 52;
369 grip->dev[i].absfuzz[t] = 1;
370 grip->dev[i].absflat[t] = 2;
371 continue;
372 }
373
374 if (j < grip_anx[grip->mode[i]]) {
375 grip->dev[i].absmin[t] = 3;
376 grip->dev[i].absmax[t] = 57;
377 grip->dev[i].absfuzz[t] = 1;
378 continue;
379 }
380
381 grip->dev[i].absmin[t] = -1;
382 grip->dev[i].absmax[t] = 1;
383 }
384
385 for (j = 0; (t = grip_btn[grip->mode[i]][j]) >= 0; j++)
386 if (t > 0)
387 set_bit(t, grip->dev[i].keybit);
388
389 input_register_device(grip->dev + i);
390
391 printk(KERN_INFO "input: %s on %s\n",
392 grip_name[grip->mode[i]], gameport->phys);
393 }
394
395 return;
396 fail2: gameport_close(gameport);
397 fail1: kfree(grip);
398 }
399
400 static void grip_disconnect(struct gameport *gameport)
401 {
402 int i;
403
404 struct grip *grip = gameport->private;
405 for (i = 0; i < 2; i++)
406 if (grip->mode[i])
407 input_unregister_device(grip->dev + i);
408 gameport_close(gameport);
409 kfree(grip);
410 }
411
412 static struct gameport_dev grip_dev = {
413 .connect = grip_connect,
414 .disconnect = grip_disconnect,
415 };
416
417 int __init grip_init(void)
418 {
419 gameport_register_device(&grip_dev);
420 return 0;
421 }
422
423 void __exit grip_exit(void)
424 {
425 gameport_unregister_device(&grip_dev);
426 }
427
428 module_init(grip_init);
429 module_exit(grip_exit);
430
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