1 /*
2 * Copyright (c) 1998-2001 Vojtech Pavlik
3 */
4
5 /*
6 * Gravis/Kensington GrIP protocol joystick and gamepad driver for Linux
7 */
8
9 /*
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 * Should you need to contact me, the author, you can do so either by
25 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
26 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
27 */
28
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/slab.h>
33 #include <linux/gameport.h>
34 #include <linux/input.h>
35 #include <linux/jiffies.h>
36
37 #define DRIVER_DESC "Gravis GrIP protocol joystick driver"
38
39 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
40 MODULE_DESCRIPTION(DRIVER_DESC);
41 MODULE_LICENSE("GPL");
42
43 #define GRIP_MODE_GPP 1
44 #define GRIP_MODE_BD 2
45 #define GRIP_MODE_XT 3
46 #define GRIP_MODE_DC 4
47
48 #define GRIP_LENGTH_GPP 24
49 #define GRIP_STROBE_GPP 200 /* 200 us */
50 #define GRIP_LENGTH_XT 4
51 #define GRIP_STROBE_XT 64 /* 64 us */
52 #define GRIP_MAX_CHUNKS_XT 10
53 #define GRIP_MAX_BITS_XT 30
54
55 struct grip {
56 struct gameport *gameport;
57 struct input_dev *dev[2];
58 unsigned char mode[2];
59 int reads;
60 int bads;
61 char phys[2][32];
62 };
63
64 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 };
65 static int grip_btn_bd[] = { BTN_THUMB, BTN_THUMB2, BTN_TRIGGER, BTN_TOP, BTN_BASE, -1 };
66 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 };
67 static int grip_btn_dc[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_BASE5, -1 };
68
69 static int grip_abs_gpp[] = { ABS_X, ABS_Y, -1 };
70 static int grip_abs_bd[] = { ABS_X, ABS_Y, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };
71 static int grip_abs_xt[] = { ABS_X, ABS_Y, ABS_BRAKE, ABS_GAS, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, -1 };
72 static int grip_abs_dc[] = { ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };
73
74 static char *grip_name[] = { NULL, "Gravis GamePad Pro", "Gravis Blackhawk Digital",
75 "Gravis Xterminator Digital", "Gravis Xterminator DualControl" };
76 static int *grip_abs[] = { NULL, grip_abs_gpp, grip_abs_bd, grip_abs_xt, grip_abs_dc };
77 static int *grip_btn[] = { NULL, grip_btn_gpp, grip_btn_bd, grip_btn_xt, grip_btn_dc };
78 static char grip_anx[] = { 0, 0, 3, 5, 5 };
79 static char grip_cen[] = { 0, 0, 2, 2, 4 };
80
81 /*
82 * grip_gpp_read_packet() reads a Gravis GamePad Pro packet.
83 */
84
85 static int grip_gpp_read_packet(struct gameport *gameport, int shift, unsigned int *data)
86 {
87 unsigned long flags;
88 unsigned char u, v;
89 unsigned int t;
90 int i;
91
92 int strobe = gameport_time(gameport, GRIP_STROBE_GPP);
93
94 data[0] = 0;
95 t = strobe;
96 i = 0;
97
98 local_irq_save(flags);
99
100 v = gameport_read(gameport) >> shift;
101
102 do {
103 t--;
104 u = v; v = (gameport_read(gameport) >> shift) & 3;
105 if (~v & u & 1) {
106 data[0] |= (v >> 1) << i++;
107 t = strobe;
108 }
109 } while (i < GRIP_LENGTH_GPP && t > 0);
110
111 local_irq_restore(flags);
112
113 if (i < GRIP_LENGTH_GPP) return -1;
114
115 for (i = 0; i < GRIP_LENGTH_GPP && (data[0] & 0xfe4210) ^ 0x7c0000; i++)
116 data[0] = data[0] >> 1 | (data[0] & 1) << (GRIP_LENGTH_GPP - 1);
117
118 return -(i == GRIP_LENGTH_GPP);
119 }
120
121 /*
122 * grip_xt_read_packet() reads a Gravis Xterminator packet.
123 */
124
125 static int grip_xt_read_packet(struct gameport *gameport, int shift, unsigned int *data)
126 {
127 unsigned int i, j, buf, crc;
128 unsigned char u, v, w;
129 unsigned long flags;
130 unsigned int t;
131 char status;
132
133 int strobe = gameport_time(gameport, GRIP_STROBE_XT);
134
135 data[0] = data[1] = data[2] = data[3] = 0;
136 status = buf = i = j = 0;
137 t = strobe;
138
139 local_irq_save(flags);
140
141 v = w = (gameport_read(gameport) >> shift) & 3;
142
143 do {
144 t--;
145 u = (gameport_read(gameport) >> shift) & 3;
146
147 if (u ^ v) {
148
149 if ((u ^ v) & 1) {
150 buf = (buf << 1) | (u >> 1);
151 t = strobe;
152 i++;
153 } else
154
155 if ((((u ^ v) & (v ^ w)) >> 1) & ~(u | v | w) & 1) {
156 if (i == 20) {
157 crc = buf ^ (buf >> 7) ^ (buf >> 14);
158 if (!((crc ^ (0x25cb9e70 >> ((crc >> 2) & 0x1c))) & 0xf)) {
159 data[buf >> 18] = buf >> 4;
160 status |= 1 << (buf >> 18);
161 }
162 j++;
163 }
164 t = strobe;
165 buf = 0;
166 i = 0;
167 }
168 w = v;
169 v = u;
170 }
171
172 } while (status != 0xf && i < GRIP_MAX_BITS_XT && j < GRIP_MAX_CHUNKS_XT && t > 0);
173
174 local_irq_restore(flags);
175
176 return -(status != 0xf);
177 }
178
179 /*
180 * grip_timer() repeatedly polls the joysticks and generates events.
181 */
182
183 static void grip_poll(struct gameport *gameport)
184 {
185 struct grip *grip = gameport_get_drvdata(gameport);
186 unsigned int data[GRIP_LENGTH_XT];
187 struct input_dev *dev;
188 int i, j;
189
190 for (i = 0; i < 2; i++) {
191
192 dev = grip->dev[i];
193 if (!dev)
194 continue;
195
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
284 static int grip_open(struct input_dev *dev)
285 {
286 struct grip *grip = input_get_drvdata(dev);
287
288 gameport_start_polling(grip->gameport);
289 return 0;
290 }
291
292 static void grip_close(struct input_dev *dev)
293 {
294 struct grip *grip = input_get_drvdata(dev);
295
296 gameport_stop_polling(grip->gameport);
297 }
298
299 static int grip_connect(struct gameport *gameport, struct gameport_driver *drv)
300 {
301 struct grip *grip;
302 struct input_dev *input_dev;
303 unsigned int data[GRIP_LENGTH_XT];
304 int i, j, t;
305 int err;
306
307 if (!(grip = kzalloc(sizeof(struct grip), GFP_KERNEL)))
308 return -ENOMEM;
309
310 grip->gameport = gameport;
311
312 gameport_set_drvdata(gameport, grip);
313
314 err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
315 if (err)
316 goto fail1;
317
318 for (i = 0; i < 2; i++) {
319 if (!grip_gpp_read_packet(gameport, (i << 1) + 4, data)) {
320 grip->mode[i] = GRIP_MODE_GPP;
321 continue;
322 }
323 if (!grip_xt_read_packet(gameport, (i << 1) + 4, data)) {
324 if (!(data[3] & 7)) {
325 grip->mode[i] = GRIP_MODE_BD;
326 continue;
327 }
328 if (!(data[2] & 0xf0)) {
329 grip->mode[i] = GRIP_MODE_XT;
330 continue;
331 }
332 grip->mode[i] = GRIP_MODE_DC;
333 continue;
334 }
335 }
336
337 if (!grip->mode[0] && !grip->mode[1]) {
338 err = -ENODEV;
339 goto fail2;
340 }
341
342 gameport_set_poll_handler(gameport, grip_poll);
343 gameport_set_poll_interval(gameport, 20);
344
345 for (i = 0; i < 2; i++) {
346 if (!grip->mode[i])
347 continue;
348
349 grip->dev[i] = input_dev = input_allocate_device();
350 if (!input_dev) {
351 err = -ENOMEM;
352 goto fail3;
353 }
354
355 snprintf(grip->phys[i], sizeof(grip->phys[i]),
356 "%s/input%d", gameport->phys, i);
357
358 input_dev->name = grip_name[grip->mode[i]];
359 input_dev->phys = grip->phys[i];
360 input_dev->id.bustype = BUS_GAMEPORT;
361 input_dev->id.vendor = GAMEPORT_ID_VENDOR_GRAVIS;
362 input_dev->id.product = grip->mode[i];
363 input_dev->id.version = 0x0100;
364 input_dev->dev.parent = &gameport->dev;
365
366 input_set_drvdata(input_dev, grip);
367
368 input_dev->open = grip_open;
369 input_dev->close = grip_close;
370
371 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
372
373 for (j = 0; (t = grip_abs[grip->mode[i]][j]) >= 0; j++) {
374
375 if (j < grip_cen[grip->mode[i]])
376 input_set_abs_params(input_dev, t, 14, 52, 1, 2);
377 else if (j < grip_anx[grip->mode[i]])
378 input_set_abs_params(input_dev, t, 3, 57, 1, 0);
379 else
380 input_set_abs_params(input_dev, t, -1, 1, 0, 0);
381 }
382
383 for (j = 0; (t = grip_btn[grip->mode[i]][j]) >= 0; j++)
384 if (t > 0)
385 set_bit(t, input_dev->keybit);
386
387 err = input_register_device(grip->dev[i]);
388 if (err)
389 goto fail4;
390 }
391
392 return 0;
393
394 fail4: input_free_device(grip->dev[i]);
395 fail3: while (--i >= 0)
396 if (grip->dev[i])
397 input_unregister_device(grip->dev[i]);
398 fail2: gameport_close(gameport);
399 fail1: gameport_set_drvdata(gameport, NULL);
400 kfree(grip);
401 return err;
402 }
403
404 static void grip_disconnect(struct gameport *gameport)
405 {
406 struct grip *grip = gameport_get_drvdata(gameport);
407 int i;
408
409 for (i = 0; i < 2; i++)
410 if (grip->dev[i])
411 input_unregister_device(grip->dev[i]);
412 gameport_close(gameport);
413 gameport_set_drvdata(gameport, NULL);
414 kfree(grip);
415 }
416
417 static struct gameport_driver grip_drv = {
418 .driver = {
419 .name = "grip",
420 .owner = THIS_MODULE,
421 },
422 .description = DRIVER_DESC,
423 .connect = grip_connect,
424 .disconnect = grip_disconnect,
425 };
426
427 static int __init grip_init(void)
428 {
429 return gameport_register_driver(&grip_drv);
430 }
431
432 static void __exit grip_exit(void)
433 {
434 gameport_unregister_driver(&grip_drv);
435 }
436
437 module_init(grip_init);
438 module_exit(grip_exit);
439
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