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Import 2.4.0-test2pre6
[davej-history.git] / drivers / char / joystick / joy-sidewinder.c
blobda11598f4a41d3ed90d3bd608c7affc7068c0aa3
1 /*
2 * joy-sidewinder.c Version 1.2
3 *
4 * Copyright (c) 1998-1999 Vojtech Pavlik
5 *
6 * Sponsored by SuSE
7 */
8
9 /*
10 * This is a module for the Linux joystick driver, supporting
11 * Microsoft SideWinder digital joystick family.
12 */
13
14 /*
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 *
29 * Should you need to contact me, the author, you can do so either by
30 * e-mail - mail your message to <vojtech@suse.cz>, or by paper mail:
31 * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
32 */
33
34 #include <asm/io.h>
35 #include <asm/system.h>
36 #include <linux/delay.h>
37 #include <linux/errno.h>
38 #include <linux/ioport.h>
39 #include <linux/joystick.h>
40 #include <linux/kernel.h>
41 #include <linux/module.h>
42 #include <linux/string.h>
43 #include <linux/init.h>
44
45 /*
46 * These are really magic values. Changing them can make a problem go away,
47 * as well as break everything.
48 */
49
50 #undef JS_SW_DEBUG
51
52 #define JS_SW_START 400 /* The time we wait for the first bit [400 us] */
53 #define JS_SW_STROBE 45 /* Max time per bit [45 us] */
54 #define JS_SW_TIMEOUT 4000 /* Wait for everything to settle [4 ms] */
55 #define JS_SW_KICK 45 /* Wait after A0 fall till kick [45 us] */
56 #define JS_SW_END 8 /* Number of bits before end of packet to kick */
57 #define JS_SW_FAIL 16 /* Number of packet read errors to fail and reinitialize */
58 #define JS_SW_BAD 2 /* Number of packet read errors to switch off 3d Pro optimization */
59 #define JS_SW_OK 64 /* Number of packet read successes to switch optimization back on */
60 #define JS_SW_LENGTH 512 /* Max number of bits in a packet */
61
62 /*
63 * SideWinder joystick types ...
64 */
65
66 #define JS_SW_TYPE_3DP 1
67 #define JS_SW_TYPE_F23 2
68 #define JS_SW_TYPE_GP 3
69 #define JS_SW_TYPE_PP 4
70 #define JS_SW_TYPE_FFP 5
71 #define JS_SW_TYPE_FSP 6
72 #define JS_SW_TYPE_FFW 7
73
74 static int js_sw_port_list[] __initdata = {0x201, 0};
75 static struct js_port* js_sw_port __initdata = NULL;
76
77 static struct {
78 int x;
79 int y;
80 } js_sw_hat_to_axis[] = {{ 0, 0}, { 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
81
82 struct js_sw_info {
83 int io;
84 int length;
85 int speed;
86 unsigned char type;
87 unsigned char bits;
88 unsigned char number;
89 unsigned char fail;
90 unsigned char ok;
91 };
92
93 /*
94 * Gameport speed.
95 */
96
97 unsigned int js_sw_io_speed = 0;
98
99 /*
100 * js_sw_measure_speed() measures the gameport i/o speed.
101 */
102
103 static int __init js_sw_measure_speed(int io)
104 {
105 #ifdef __i386__
106
107 #define GET_TIME(x) do { outb(0, 0x43); x = inb(0x40); x |= inb(0x40) << 8; } while (0)
108 #define DELTA(x,y) ((y)-(x)+((y)<(x)?1193180L/HZ:0))
109
110 unsigned int i, t, t1, t2, t3, tx;
111 unsigned long flags;
112
113 tx = 1 << 30;
114
115 for(i = 0; i < 50; i++) {
116 save_flags(flags); /* Yes, all CPUs */
117 cli();
118 GET_TIME(t1);
119 for(t = 0; t < 50; t++) inb(io);
120 GET_TIME(t2);
121 GET_TIME(t3);
122 restore_flags(flags);
123 udelay(i * 10);
124 if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t;
125 }
126
127 return 59659 / t;
128
129 #else
130
131 unsigned int j, t = 0;
132
133 j = jiffies; while (j == jiffies);
134 j = jiffies; while (j == jiffies) { t++; inb(0x201); }
135
136 return t * HZ / 1000;
137
138 #endif
139 }
140
141 /*
142 * js_sw_read_packet() is a function which reads either a data packet, or an
143 * identification packet from a SideWinder joystick. Better don't try to
144 * understand this, since all the ugliness of the Microsoft Digital
145 * Overdrive protocol is concentrated in this function. If you really want
146 * to know how this works, first go watch a couple horror movies, so that
147 * you are well prepared, read US patent #5628686 and then e-mail me,
148 * and I'll send you an explanation.
149 * Vojtech <vojtech@suse.cz>
150 */
151
152 static int js_sw_read_packet(int io, int speed, unsigned char *buf, int length, int id)
153 {
154 unsigned long flags;
155 int timeout, bitout, sched, i, kick, start, strobe;
156 unsigned char pending, u, v;
157
158 i = -id; /* Don't care about data, only want ID */
159 timeout = id ? (JS_SW_TIMEOUT * speed) >> 10 : 0; /* Set up global timeout for ID packet */
160 kick = id ? (JS_SW_KICK * speed) >> 10 : 0; /* Set up kick timeout for ID packet */
161 start = (JS_SW_START * speed) >> 10;
162 strobe = (JS_SW_STROBE * speed) >> 10;
163 bitout = start;
164 pending = 0;
165 sched = 0;
166
167 __save_flags(flags); /* Quiet, please */
168 __cli();
169
170 outb(0xff, io); /* Trigger */
171 v = inb(io);
172
173 do {
174 bitout--;
175 u = v;
176 v = inb(io);
177 } while (!(~v & u & 0x10) && (bitout > 0)); /* Wait for first falling edge on clock */
178
179 if (bitout > 0) bitout = strobe; /* Extend time if not timed out */
180
181 while ((timeout > 0 || bitout > 0) && (i < length)) {
182
183 timeout--;
184 bitout--; /* Decrement timers */
185 sched--;
186
187 u = v;
188 v = inb(io);
189
190 if ((~u & v & 0x10) && (bitout > 0)) { /* Rising edge on clock - data bit */
191 if (i >= 0) /* Want this data */
192 buf[i] = v >> 5; /* Store it */
193 i++; /* Advance index */
194 bitout = strobe; /* Extend timeout for next bit */
195 }
196
197 if (kick && (~v & u & 0x01)) { /* Falling edge on axis 0 */
198 sched = kick; /* Schedule second trigger */
199 kick = 0; /* Don't schedule next time on falling edge */
200 pending = 1; /* Mark schedule */
201 }
202
203 if (pending && sched < 0 && (i > -JS_SW_END)) { /* Second trigger time */
204 outb(0xff, io); /* Trigger */
205 bitout = start; /* Long bit timeout */
206 pending = 0; /* Unmark schedule */
207 timeout = 0; /* Switch from global to bit timeouts */
208 }
209 }
210
211 __restore_flags(flags); /* Done - relax */
212
213 #ifdef JS_SW_DEBUG
214 {
215 int j;
216 printk(KERN_DEBUG "joy-sidewinder: Read %d triplets. [", i);
217 for (j = 0; j < i; j++) printk("%d", buf[j]);
218 printk("]\n");
219 }
220 #endif
221
222 return i;
223 }
224
225 /*
226 * js_sw_get_bits() and GB() compose bits from the triplet buffer into a __u64.
227 * Parameter 'pos' is bit number inside packet where to start at, 'num' is number
228 * of bits to be read, 'shift' is offset in the resulting __u64 to start at, bits
229 * is number of bits per triplet.
230 */
231
232 #define GB(pos,num,shift) js_sw_get_bits(buf, pos, num, shift, info->bits)
233
234 static __u64 js_sw_get_bits(unsigned char *buf, int pos, int num, char shift, char bits)
235 {
236 __u64 data = 0;
237 int tri = pos % bits; /* Start position */
238 int i = pos / bits;
239 int bit = shift;
240
241 while (num--) {
242 data |= (__u64)((buf[i] >> tri++) & 1) << bit++; /* Transfer bit */
243 if (tri == bits) {
244 i++; /* Next triplet */
245 tri = 0;
246 }
247 }
248
249 return data;
250 }
251
252 /*
253 * js_sw_init_digital() initializes a SideWinder 3D Pro joystick
254 * into digital mode.
255 */
256
257 static void js_sw_init_digital(int io, int speed)
258 {
259 int seq[] = { 140, 140+725, 140+300, 0 };
260 unsigned long flags;
261 int i, t;
262
263 __save_flags(flags);
264 __cli();
265
266 i = 0;
267 do {
268 outb(0xff, io); /* Trigger */
269 t = (JS_SW_TIMEOUT * speed) >> 10;
270 while ((inb(io) & 1) && t) t--; /* Wait for axis to fall back to 0 */
271 udelay(seq[i]); /* Delay magic time */
272 } while (seq[++i]);
273
274 outb(0xff, io); /* Last trigger */
275
276 __restore_flags(flags);
277 }
278
279 /*
280 * js_sw_parity() computes parity of __u64
281 */
282
283 static int js_sw_parity(__u64 t)
284 {
285 int x = t ^ (t >> 32);
286 x ^= x >> 16;
287 x ^= x >> 8;
288 x ^= x >> 4;
289 x ^= x >> 2;
290 x ^= x >> 1;
291 return x & 1;
292 }
293
294 /*
295 * js_sw_ccheck() checks synchronization bits and computes checksum of nibbles.
296 */
297
298 static int js_sw_check(__u64 t)
299 {
300 char sum = 0;
301
302 if ((t & 0x8080808080808080ULL) ^ 0x80) /* Sync */
303 return -1;
304
305 while (t) { /* Sum */
306 sum += t & 0xf;
307 t >>= 4;
308 }
309
310 return sum & 0xf;
311 }
312
313 /*
314 * js_sw_parse() analyzes SideWinder joystick data, and writes the results into
315 * the axes and buttons arrays.
316 */
317
318 static int js_sw_parse(unsigned char *buf, struct js_sw_info *info, int **axes, int **buttons)
319 {
320 int hat, i;
321
322 switch (info->type) {
323
324 case JS_SW_TYPE_3DP:
325 case JS_SW_TYPE_F23:
326
327 if (js_sw_check(GB(0,64,0)) || (hat = GB(6,1,3) | GB(60,3,0)) > 8) return -1;
328
329 axes[0][0] = GB( 3,3,7) | GB(16,7,0);
330 axes[0][1] = GB( 0,3,7) | GB(24,7,0);
331 axes[0][2] = GB(35,2,7) | GB(40,7,0);
332 axes[0][3] = GB(32,3,7) | GB(48,7,0);
333 axes[0][4] = js_sw_hat_to_axis[hat].x;
334 axes[0][5] = js_sw_hat_to_axis[hat].y;
335 buttons[0][0] = ~(GB(37,1,8) | GB(38,1,7) | GB(8,7,0));
336
337 return 0;
338
339 case JS_SW_TYPE_GP:
340
341 for (i = 0; i < info->number * 15; i += 15) {
342
343 if (js_sw_parity(GB(i,15,0))) return -1;
344
345 axes[i][0] = GB(i+3,1,0) - GB(i+2,1,0);
346 axes[i][1] = GB(i+0,1,0) - GB(i+1,1,0);
347 buttons[i][0] = ~GB(i+4,10,0);
348
349 }
350
351 return 0;
352
353 case JS_SW_TYPE_PP:
354 case JS_SW_TYPE_FFP:
355
356 if (!js_sw_parity(GB(0,48,0)) || (hat = GB(42,4,0)) > 8) return -1;
357
358 axes[0][0] = GB( 9,10,0);
359 axes[0][1] = GB(19,10,0);
360 axes[0][2] = GB(36, 6,0);
361 axes[0][3] = GB(29, 7,0);
362 axes[0][4] = js_sw_hat_to_axis[hat].x;
363 axes[0][5] = js_sw_hat_to_axis[hat].y;
364 buttons[0][0] = ~GB(0,9,0);
365
366 return 0;
367
368 case JS_SW_TYPE_FSP:
369
370 if (!js_sw_parity(GB(0,43,0)) || (hat = GB(28,4,0)) > 8) return -1;
371
372 axes[0][0] = GB( 0,10,0);
373 axes[0][1] = GB(16,10,0);
374 axes[0][2] = GB(32, 6,0);
375 axes[0][3] = js_sw_hat_to_axis[hat].x;
376 axes[0][4] = js_sw_hat_to_axis[hat].y;
377 buttons[0][0] = ~(GB(10,6,0) | GB(26,2,6) | GB(38,2,8));
378
379 return 0;
380
381 case JS_SW_TYPE_FFW:
382
383 if (!js_sw_parity(GB(0,33,0))) return -1;
384
385 axes[0][0] = GB( 0,10,0);
386 axes[0][1] = GB(10, 6,0);
387 axes[0][2] = GB(16, 6,0);
388 buttons[0][0] = ~GB(22,8,0);
389
390 return 0;
391 }
392
393 return -1;
394 }
395
396 /*
397 * js_sw_read() reads SideWinder joystick data, and reinitializes
398 * the joystick in case of persistent problems. This is the function that is
399 * called from the generic code to poll the joystick.
400 */
401
402 static int js_sw_read(void *xinfo, int **axes, int **buttons)
403 {
404 struct js_sw_info *info = xinfo;
405 unsigned char buf[JS_SW_LENGTH];
406 int i;
407
408 i = js_sw_read_packet(info->io, info->speed, buf, info->length, 0);
409
410 if (info->type <= JS_SW_TYPE_F23 && info->length == 66 && i != 66) { /* Broken packet, try to fix */
411
412 if (i == 64 && !js_sw_check(js_sw_get_bits(buf,0,64,0,1))) { /* Last init failed, 1 bit mode */
413 printk(KERN_WARNING "joy-sidewinder: Joystick in wrong mode on %#x"
414 " - going to reinitialize.\n", info->io);
415 info->fail = JS_SW_FAIL; /* Reinitialize */
416 i = 128; /* Bogus value */
417 }
418
419 if (i < 66 && GB(0,64,0) == GB(i*3-66,64,0)) /* 1 == 3 */
420 i = 66; /* Everything is fine */
421
422 if (i < 66 && GB(0,64,0) == GB(66,64,0)) /* 1 == 2 */
423 i = 66; /* Everything is fine */
424
425 if (i < 66 && GB(i*3-132,64,0) == GB(i*3-66,64,0)) { /* 2 == 3 */
426 memmove(buf, buf + i - 22, 22); /* Move data */
427 i = 66; /* Carry on */
428 }
429 }
430
431 if (i == info->length && !js_sw_parse(buf, info, axes, buttons)) { /* Parse data */
432
433 info->fail = 0;
434 info->ok++;
435
436 if (info->type <= JS_SW_TYPE_F23 && info->length == 66 /* Many packets OK */
437 && info->ok > JS_SW_OK) {
438
439 printk(KERN_INFO "joy-sidewinder: No more trouble on %#x"
440 " - enabling optimization again.\n", info->io);
441 info->length = 22;
442 }
443
444 return 0;
445 }
446
447 info->ok = 0;
448 info->fail++;
449
450 if (info->type <= JS_SW_TYPE_F23 && info->length == 22 /* Consecutive bad packets */
451 && info->fail > JS_SW_BAD) {
452
453 printk(KERN_INFO "joy-sidewinder: Many bit errors on %#x"
454 " - disabling optimization.\n", info->io);
455 info->length = 66;
456 }
457
458 if (info->fail < JS_SW_FAIL) return -1; /* Not enough, don't reinitialize yet */
459
460 printk(KERN_WARNING "joy-sidewinder: Too many bit errors on %#x"
461 " - reinitializing joystick.\n", info->io);
462
463 if (!i && info->type <= JS_SW_TYPE_F23) { /* 3D Pro can be in analog mode */
464 udelay(3 * JS_SW_TIMEOUT);
465 js_sw_init_digital(info->io, info->speed);
466 }
467
468 udelay(JS_SW_TIMEOUT);
469 i = js_sw_read_packet(info->io, info->speed, buf, JS_SW_LENGTH, 0); /* Read normal data packet */
470 udelay(JS_SW_TIMEOUT);
471 js_sw_read_packet(info->io, info->speed, buf, JS_SW_LENGTH, i); /* Read ID packet, this initializes the stick */
472
473 info->fail = JS_SW_FAIL;
474
475 return -1;
476 }
477
478 /*
479 * js_sw_init_corr() initializes the correction values for
480 * SideWinders.
481 */
482
483 static void __init js_sw_init_corr(int num_axes, int type, int number, struct js_corr **corr)
484 {
485 int i, j;
486
487 for (i = 0; i < number; i++) {
488
489 for (j = 0; j < num_axes; j++) {
490 corr[i][j].type = JS_CORR_BROKEN;
491 corr[i][j].prec = 8;
492 corr[i][j].coef[0] = 511 - 32;
493 corr[i][j].coef[1] = 512 + 32;
494 corr[i][j].coef[2] = (1 << 29) / (511 - 32);
495 corr[i][j].coef[3] = (1 << 29) / (511 - 32);
496 }
497
498 switch (type) {
499
500 case JS_SW_TYPE_3DP:
501 case JS_SW_TYPE_F23:
502
503 corr[i][2].type = JS_CORR_BROKEN;
504 corr[i][2].prec = 4;
505 corr[i][2].coef[0] = 255 - 16;
506 corr[i][2].coef[1] = 256 + 16;
507 corr[i][2].coef[2] = (1 << 29) / (255 - 16);
508 corr[i][2].coef[3] = (1 << 29) / (255 - 16);
509
510 j = 4;
511
512 break;
513
514 case JS_SW_TYPE_PP:
515 case JS_SW_TYPE_FFP:
516
517 corr[i][2].type = JS_CORR_BROKEN;
518 corr[i][2].prec = 0;
519 corr[i][2].coef[0] = 31 - 2;
520 corr[i][2].coef[1] = 32 + 2;
521 corr[i][2].coef[2] = (1 << 29) / (31 - 2);
522 corr[i][2].coef[3] = (1 << 29) / (31 - 2);
523
524 corr[i][3].type = JS_CORR_BROKEN;
525 corr[i][3].prec = 1;
526 corr[i][3].coef[0] = 63 - 4;
527 corr[i][3].coef[1] = 64 + 4;
528 corr[i][3].coef[2] = (1 << 29) / (63 - 4);
529 corr[i][3].coef[3] = (1 << 29) / (63 - 4);
530
531 j = 4;
532
533 break;
534
535 case JS_SW_TYPE_FFW:
536
537 corr[i][0].type = JS_CORR_BROKEN;
538 corr[i][0].prec = 2;
539 corr[i][0].coef[0] = 511 - 8;
540 corr[i][0].coef[1] = 512 + 8;
541 corr[i][0].coef[2] = (1 << 29) / (511 - 8);
542 corr[i][0].coef[3] = (1 << 29) / (511 - 8);
543
544 corr[i][1].type = JS_CORR_BROKEN;
545 corr[i][1].prec = 1;
546 corr[i][1].coef[0] = 63;
547 corr[i][1].coef[1] = 63;
548 corr[i][1].coef[2] = (1 << 29) / -63;
549 corr[i][1].coef[3] = (1 << 29) / -63;
550
551 corr[i][2].type = JS_CORR_BROKEN;
552 corr[i][2].prec = 1;
553 corr[i][2].coef[0] = 63;
554 corr[i][2].coef[1] = 63;
555 corr[i][2].coef[2] = (1 << 29) / -63;
556 corr[i][2].coef[3] = (1 << 29) / -63;
557
558 j = 3;
559
560 break;
561
562 case JS_SW_TYPE_FSP:
563
564 corr[i][2].type = JS_CORR_BROKEN;
565 corr[i][2].prec = 0;
566 corr[i][2].coef[0] = 31 - 2;
567 corr[i][2].coef[1] = 32 + 2;
568 corr[i][2].coef[2] = (1 << 29) / (31 - 2);
569 corr[i][2].coef[3] = (1 << 29) / (31 - 2);
570
571 j = 3;
572
573 break;
574
575 default:
576
577 j = 0;
578 }
579
580 for (; j < num_axes; j++) { /* Hats & other binary axes */
581 corr[i][j].type = JS_CORR_BROKEN;
582 corr[i][j].prec = 0;
583 corr[i][j].coef[0] = 0;
584 corr[i][j].coef[1] = 0;
585 corr[i][j].coef[2] = (1 << 29);
586 corr[i][j].coef[3] = (1 << 29);
587 }
588 }
589 }
590
591 /*
592 * js_sw_print_packet() prints the contents of a SideWinder packet.
593 */
594
595 static void js_sw_print_packet(char *name, int length, unsigned char *buf, char bits)
596 {
597 int i;
598
599 printk("joy-sidewinder: %s packet, %d bits. [", name, length);
600 for (i = (((length + 3) >> 2) - 1); i >= 0; i--)
601 printk("%x", (int)js_sw_get_bits(buf, i << 2, 4, 0, bits));
602 printk("]\n");
603 }
604
605 /*
606 * js_sw_3dp_id() translates the 3DP id into a human legible string.
607 * Unfortunately I don't know how to do this for the other SW types.
608 */
609
610 static void js_sw_3dp_id(unsigned char *buf, char *comment)
611 {
612 int i;
613 char pnp[8], rev[9];
614
615 for (i = 0; i < 7; i++) /* ASCII PnP ID */
616 pnp[i] = js_sw_get_bits(buf, 24+8*i, 8, 0, 1);
617
618 for (i = 0; i < 8; i++) /* ASCII firmware revision */
619 rev[i] = js_sw_get_bits(buf, 88+8*i, 8, 0, 1);
620
621 pnp[7] = rev[8] = 0;
622
623 sprintf(comment, " [PnP %d.%02d id %s rev %s]",
624 (int) (js_sw_get_bits(buf, 8, 6, 6, 1) | /* Two 6-bit values */
625 js_sw_get_bits(buf, 16, 6, 0, 1)) / 100,
626 (int) (js_sw_get_bits(buf, 8, 6, 6, 1) |
627 js_sw_get_bits(buf, 16, 6, 0, 1)) % 100,
628 pnp, rev);
629 }
630
631 /*
632 * js_sw_guess_mode() checks the upper two button bits for toggling -
633 * indication of that the joystick is in 3-bit mode. This is documented
634 * behavior for 3DP ID packet, and for example the FSP does this in
635 * normal packets instead. Fun ...
636 */
637
638 static int js_sw_guess_mode(unsigned char *buf, int len)
639 {
640 int i;
641 unsigned char xor = 0;
642 for (i = 1; i < len; i++) xor |= (buf[i - 1] ^ buf[i]) & 6;
643 return !!xor * 2 + 1;
644 }
645
646 /*
647 * js_sw_probe() probes for SideWinder type joysticks.
648 */
649
650 static struct js_port __init *js_sw_probe(int io, struct js_port *port)
651 {
652 struct js_sw_info info;
653 char *names[] = {NULL, "SideWinder 3D Pro", "Flight2000 F-23", "SideWinder GamePad", "SideWinder Precision Pro",
654 "SideWinder Force Feedback Pro", "SideWinder FreeStyle Pro", "SideWinder Force Feedback Wheel" };
655 char axes[] = { 0, 6, 6, 2, 6, 6, 5, 3 };
656 char buttons[] = { 0, 9, 9, 10, 9, 9, 10, 8 };
657 int i, j, k, l, speed;
658 unsigned char buf[JS_SW_LENGTH];
659 unsigned char idbuf[JS_SW_LENGTH];
660 unsigned char m = 1;
661 char comment[40];
662
663 comment[0] = 0;
664
665 if (check_region(io, 1)) return port;
666
667 speed = js_sw_measure_speed(io);
668
669 i = js_sw_read_packet(io, speed, buf, JS_SW_LENGTH, 0); /* Read normal packet */
670 m |= js_sw_guess_mode(buf, i); /* Data packet (1-bit) can carry mode info [FSP] */
671 udelay(JS_SW_TIMEOUT);
672
673 #ifdef JS_SW_DEBUG
674 printk(KERN_DEBUG "joy-sidewinder: Init 1: Mode %d. Length %d.\n", m , i);
675 #endif
676
677 if (!i) { /* No data. 3d Pro analog mode? */
678 js_sw_init_digital(io, speed); /* Switch to digital */
679 udelay(JS_SW_TIMEOUT);
680 i = js_sw_read_packet(io, speed, buf, JS_SW_LENGTH, 0); /* Retry reading packet */
681 udelay(JS_SW_TIMEOUT);
682 #ifdef JS_SW_DEBUG
683 printk(KERN_DEBUG "joy-sidewinder: Init 1b: Length %d.\n", i);
684 #endif
685 if (!i) return port; /* No data -> FAIL */
686 }
687
688 j = js_sw_read_packet(io, speed, idbuf, JS_SW_LENGTH, i); /* Read ID. This initializes the stick */
689 m |= js_sw_guess_mode(idbuf, j); /* ID packet should carry mode info [3DP] */
690
691 #ifdef JS_SW_DEBUG
692 printk(KERN_DEBUG "joy-sidewinder: Init 2: Mode %d. ID Length %d.\n", m , j);
693 #endif
694
695 if (!j) { /* Read ID failed. Happens in 1-bit mode on PP */
696 udelay(JS_SW_TIMEOUT);
697 i = js_sw_read_packet(io, speed, buf, JS_SW_LENGTH, 0); /* Retry reading packet */
698 #ifdef JS_SW_DEBUG
699 printk(KERN_DEBUG "joy-sidewinder: Init 2b: Mode %d. Length %d.\n", m , i);
700 #endif
701 if (!i) return port;
702 udelay(JS_SW_TIMEOUT);
703 j = js_sw_read_packet(io, speed, idbuf, JS_SW_LENGTH, i);/* Retry reading ID */
704 #ifdef JS_SW_DEBUG
705 printk(KERN_DEBUG "joy-sidewinder: Init 2c: ID Length %d.\n", j);
706 #endif
707
708 }
709
710 k = JS_SW_FAIL; /* Try JS_SW_FAIL times */
711 l = 0;
712
713 do {
714 k--;
715 udelay(JS_SW_TIMEOUT);
716 i = js_sw_read_packet(io, speed, buf, JS_SW_LENGTH, 0); /* Read data packet */
717 #ifdef JS_SW_DEBUG
718 printk(KERN_DEBUG "joy-sidewinder: Init 3: Length %d.\n", i);
719 #endif
720
721 if (i > l) { /* Longer? As we can only lose bits, it makes */
722 /* no sense to try detection for a packet shorter */
723 l = i; /* than the previous one */
724
725 info.number = 1;
726 info.io = io;
727 info.speed = speed;
728 info.length = i;
729 info.bits = m;
730 info.fail = 0;
731 info.ok = 0;
732 info.type = 0;
733
734 switch (i * m) {
735 case 60:
736 info.number++;
737 case 45: /* Ambiguous packet length */
738 if (j <= 40) { /* ID length less or eq 40 -> FSP */
739 case 43:
740 info.type = JS_SW_TYPE_FSP;
741 break;
742 }
743 info.number++;
744 case 30:
745 info.number++;
746 case 15:
747 info.type = JS_SW_TYPE_GP;
748 break;
749 case 33:
750 case 31:
751 info.type = JS_SW_TYPE_FFW;
752 break;
753 case 48: /* Ambiguous */
754 if (j == 14) { /* ID lenght 14*3 -> FFP */
755 info.type = JS_SW_TYPE_FFP;
756 sprintf(comment, " [AC %s]", js_sw_get_bits(idbuf,38,1,0,3) ? "off" : "on");
757 } else
758 info.type = JS_SW_TYPE_PP;
759 break;
760 case 198:
761 info.length = 22;
762 case 64:
763 info.type = JS_SW_TYPE_3DP;
764 if (j == 160) js_sw_3dp_id(idbuf, comment);
765 break;
766 }
767 }
768
769 } while (k && !info.type);
770
771 if (!info.type) {
772 printk(KERN_WARNING "joy-sidewinder: unknown joystick device detected "
773 "(io=%#x), contact <vojtech@suse.cz>\n", io);
774 js_sw_print_packet("ID", j * 3, idbuf, 3);
775 js_sw_print_packet("Data", i * m, buf, m);
776 return port;
777 }
778
779 #ifdef JS_SW_DEBUG
780 js_sw_print_packet("ID", j * 3, idbuf, 3);
781 js_sw_print_packet("Data", i * m, buf, m);
782 #endif
783
784 k = i;
785
786 request_region(io, 1, "joystick (sidewinder)");
787
788 port = js_register_port(port, &info, info.number, sizeof(struct js_sw_info), js_sw_read);
789
790 for (i = 0; i < info.number; i++)
791 printk(KERN_INFO "js%d: %s%s at %#x [%d ns res %d-bit id %d data %d]\n",
792 js_register_device(port, i, axes[info.type], buttons[info.type],
793 names[info.type], THIS_MODULE, NULL, NULL), names[info.type], comment, io,
794 1000000 / speed, m, j, k);
795
796 js_sw_init_corr(axes[info.type], info.type, info.number, port->corr);
797
798 return port;
799 }
800
801 #ifdef MODULE
802 int init_module(void)
803 #else
804 int __init js_sw_init(void)
805 #endif
806 {
807 int *p;
808
809 for (p = js_sw_port_list; *p; p++) js_sw_port = js_sw_probe(*p, js_sw_port);
810 if (js_sw_port) return 0;
811
812 #ifdef MODULE
813 printk(KERN_WARNING "joy-sidewinder: no joysticks found\n");
814 #endif
815
816 return -ENODEV;
817 }
818
819 #ifdef MODULE
820 void cleanup_module(void)
821 {
822 int i;
823 struct js_sw_info *info;
824
825 while (js_sw_port) {
826 for (i = 0; i < js_sw_port->ndevs; i++)
827 if (js_sw_port->devs[i])
828 js_unregister_device(js_sw_port->devs[i]);
829 info = js_sw_port->info;
830 release_region(info->io, 1);
831 js_sw_port = js_unregister_port(js_sw_port);
832 }
833
834 }
835 #endif
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