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sidewinder.c
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1 /*
2  * Copyright (c) 1998-2005 Vojtech Pavlik
3  */
4 
5 /*
6  * Microsoft SideWinder joystick family 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 <[email protected]>, or by paper mail:
26  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
27  */
28 
29 #include <linux/delay.h>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/slab.h>
33 #include <linux/init.h>
34 #include <linux/input.h>
35 #include <linux/gameport.h>
36 #include <linux/jiffies.h>
37 
38 #define DRIVER_DESC "Microsoft SideWinder joystick family driver"
39 
40 MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
41 MODULE_DESCRIPTION(DRIVER_DESC);
42 MODULE_LICENSE("GPL");
43 
44 /*
45  * These are really magic values. Changing them can make a problem go away,
46  * as well as break everything.
47  */
48 
49 #undef SW_DEBUG
50 #undef SW_DEBUG_DATA
51 
52 #define SW_START 600 /* The time we wait for the first bit [600 us] */
53 #define SW_STROBE 60 /* Max time per bit [60 us] */
54 #define SW_TIMEOUT 6 /* Wait for everything to settle [6 ms] */
55 #define SW_KICK 45 /* Wait after A0 fall till kick [45 us] */
56 #define SW_END 8 /* Number of bits before end of packet to kick */
57 #define SW_FAIL 16 /* Number of packet read errors to fail and reinitialize */
58 #define SW_BAD 2 /* Number of packet read errors to switch off 3d Pro optimization */
59 #define SW_OK 64 /* Number of packet read successes to switch optimization back on */
60 #define SW_LENGTH 512 /* Max number of bits in a packet */
61 
62 #ifdef SW_DEBUG
63 #define dbg(format, arg...) printk(KERN_DEBUG __FILE__ ": " format "\n" , ## arg)
64 #else
65 #define dbg(format, arg...) do {} while (0)
66 #endif
67 
68 /*
69  * SideWinder joystick types ...
70  */
71 
72 #define SW_ID_3DP 0
73 #define SW_ID_GP 1
74 #define SW_ID_PP 2
75 #define SW_ID_FFP 3
76 #define SW_ID_FSP 4
77 #define SW_ID_FFW 5
78 
79 /*
80  * Names, buttons, axes ...
81  */
82 
83 static char *sw_name[] = { "3D Pro", "GamePad", "Precision Pro", "Force Feedback Pro", "FreeStyle Pro",
84  "Force Feedback Wheel" };
85 
86 static char sw_abs[][7] = {
87  { ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
88  { ABS_X, ABS_Y },
89  { ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
90  { ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
91  { ABS_X, ABS_Y, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
92  { ABS_RX, ABS_RUDDER, ABS_THROTTLE }};
93 
94 static char sw_bit[][7] = {
95  { 10, 10, 9, 10, 1, 1 },
96  { 1, 1 },
97  { 10, 10, 6, 7, 1, 1 },
98  { 10, 10, 6, 7, 1, 1 },
99  { 10, 10, 6, 1, 1 },
100  { 10, 7, 7, 1, 1 }};
101 
102 static short sw_btn[][12] = {
103  { BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_THUMB2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_MODE },
104  { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_START, BTN_MODE },
105  { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_SELECT },
106  { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_SELECT },
107  { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_START, BTN_MODE, BTN_SELECT },
108  { BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_THUMB2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4 }};
109 
110 static struct {
111  int x;
112  int y;
113 } sw_hat_to_axis[] = {{ 0, 0}, { 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
114 
115 struct sw {
116  struct gameport *gameport;
117  struct input_dev *dev[4];
118  char name[64];
119  char phys[4][32];
120  int length;
121  int type;
122  int bits;
123  int number;
124  int fail;
125  int ok;
126  int reads;
127  int bads;
128 };
129 
130 /*
131  * sw_read_packet() is a function which reads either a data packet, or an
132  * identification packet from a SideWinder joystick. The protocol is very,
133  * very, very braindamaged. Microsoft patented it in US patent #5628686.
134  */
135 
136 static int sw_read_packet(struct gameport *gameport, unsigned char *buf, int length, int id)
137 {
138  unsigned long flags;
139  int timeout, bitout, sched, i, kick, start, strobe;
140  unsigned char pending, u, v;
141 
142  i = -id; /* Don't care about data, only want ID */
143  timeout = id ? gameport_time(gameport, SW_TIMEOUT * 1000) : 0; /* Set up global timeout for ID packet */
144  kick = id ? gameport_time(gameport, SW_KICK) : 0; /* Set up kick timeout for ID packet */
145  start = gameport_time(gameport, SW_START);
146  strobe = gameport_time(gameport, SW_STROBE);
147  bitout = start;
148  pending = 0;
149  sched = 0;
150 
151  local_irq_save(flags); /* Quiet, please */
152 
153  gameport_trigger(gameport); /* Trigger */
154  v = gameport_read(gameport);
155 
156  do {
157  bitout--;
158  u = v;
159  v = gameport_read(gameport);
160  } while (!(~v & u & 0x10) && (bitout > 0)); /* Wait for first falling edge on clock */
161 
162  if (bitout > 0)
163  bitout = strobe; /* Extend time if not timed out */
164 
165  while ((timeout > 0 || bitout > 0) && (i < length)) {
166 
167  timeout--;
168  bitout--; /* Decrement timers */
169  sched--;
170 
171  u = v;
172  v = gameport_read(gameport);
173 
174  if ((~u & v & 0x10) && (bitout > 0)) { /* Rising edge on clock - data bit */
175  if (i >= 0) /* Want this data */
176  buf[i] = v >> 5; /* Store it */
177  i++; /* Advance index */
178  bitout = strobe; /* Extend timeout for next bit */
179  }
180 
181  if (kick && (~v & u & 0x01)) { /* Falling edge on axis 0 */
182  sched = kick; /* Schedule second trigger */
183  kick = 0; /* Don't schedule next time on falling edge */
184  pending = 1; /* Mark schedule */
185  }
186 
187  if (pending && sched < 0 && (i > -SW_END)) { /* Second trigger time */
188  gameport_trigger(gameport); /* Trigger */
189  bitout = start; /* Long bit timeout */
190  pending = 0; /* Unmark schedule */
191  timeout = 0; /* Switch from global to bit timeouts */
192  }
193  }
194 
195  local_irq_restore(flags); /* Done - relax */
196 
197 #ifdef SW_DEBUG_DATA
198  {
199  int j;
200  printk(KERN_DEBUG "sidewinder.c: Read %d triplets. [", i);
201  for (j = 0; j < i; j++) printk("%d", buf[j]);
202  printk("]\n");
203  }
204 #endif
205 
206  return i;
207 }
208 
209 /*
210  * sw_get_bits() and GB() compose bits from the triplet buffer into a __u64.
211  * Parameter 'pos' is bit number inside packet where to start at, 'num' is number
212  * of bits to be read, 'shift' is offset in the resulting __u64 to start at, bits
213  * is number of bits per triplet.
214  */
215 
216 #define GB(pos,num) sw_get_bits(buf, pos, num, sw->bits)
217 
218 static __u64 sw_get_bits(unsigned char *buf, int pos, int num, char bits)
219 {
220  __u64 data = 0;
221  int tri = pos % bits; /* Start position */
222  int i = pos / bits;
223  int bit = 0;
224 
225  while (num--) {
226  data |= (__u64)((buf[i] >> tri++) & 1) << bit++; /* Transfer bit */
227  if (tri == bits) {
228  i++; /* Next triplet */
229  tri = 0;
230  }
231  }
232 
233  return data;
234 }
235 
236 /*
237  * sw_init_digital() initializes a SideWinder 3D Pro joystick
238  * into digital mode.
239  */
240 
241 static void sw_init_digital(struct gameport *gameport)
242 {
243  int seq[] = { 140, 140+725, 140+300, 0 };
244  unsigned long flags;
245  int i, t;
246 
247  local_irq_save(flags);
248 
249  i = 0;
250  do {
251  gameport_trigger(gameport); /* Trigger */
252  t = gameport_time(gameport, SW_TIMEOUT * 1000);
253  while ((gameport_read(gameport) & 1) && t) t--; /* Wait for axis to fall back to 0 */
254  udelay(seq[i]); /* Delay magic time */
255  } while (seq[++i]);
256 
257  gameport_trigger(gameport); /* Last trigger */
258 
259  local_irq_restore(flags);
260 }
261 
262 /*
263  * sw_parity() computes parity of __u64
264  */
265 
266 static int sw_parity(__u64 t)
267 {
268  int x = t ^ (t >> 32);
269 
270  x ^= x >> 16;
271  x ^= x >> 8;
272  x ^= x >> 4;
273  x ^= x >> 2;
274  x ^= x >> 1;
275  return x & 1;
276 }
277 
278 /*
279  * sw_ccheck() checks synchronization bits and computes checksum of nibbles.
280  */
281 
282 static int sw_check(__u64 t)
283 {
284  unsigned char sum = 0;
285 
286  if ((t & 0x8080808080808080ULL) ^ 0x80) /* Sync */
287  return -1;
288 
289  while (t) { /* Sum */
290  sum += t & 0xf;
291  t >>= 4;
292  }
293 
294  return sum & 0xf;
295 }
296 
297 /*
298  * sw_parse() analyzes SideWinder joystick data, and writes the results into
299  * the axes and buttons arrays.
300  */
301 
302 static int sw_parse(unsigned char *buf, struct sw *sw)
303 {
304  int hat, i, j;
305  struct input_dev *dev;
306 
307  switch (sw->type) {
308 
309  case SW_ID_3DP:
310 
311  if (sw_check(GB(0,64)) || (hat = (GB(6,1) << 3) | GB(60,3)) > 8)
312  return -1;
313 
314  dev = sw->dev[0];
315 
316  input_report_abs(dev, ABS_X, (GB( 3,3) << 7) | GB(16,7));
317  input_report_abs(dev, ABS_Y, (GB( 0,3) << 7) | GB(24,7));
318  input_report_abs(dev, ABS_RZ, (GB(35,2) << 7) | GB(40,7));
319  input_report_abs(dev, ABS_THROTTLE, (GB(32,3) << 7) | GB(48,7));
320 
321  input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
322  input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);
323 
324  for (j = 0; j < 7; j++)
325  input_report_key(dev, sw_btn[SW_ID_3DP][j], !GB(j+8,1));
326 
327  input_report_key(dev, BTN_BASE4, !GB(38,1));
328  input_report_key(dev, BTN_BASE5, !GB(37,1));
329 
330  input_sync(dev);
331 
332  return 0;
333 
334  case SW_ID_GP:
335 
336  for (i = 0; i < sw->number; i ++) {
337 
338  if (sw_parity(GB(i*15,15)))
339  return -1;
340 
341  input_report_abs(sw->dev[i], ABS_X, GB(i*15+3,1) - GB(i*15+2,1));
342  input_report_abs(sw->dev[i], ABS_Y, GB(i*15+0,1) - GB(i*15+1,1));
343 
344  for (j = 0; j < 10; j++)
345  input_report_key(sw->dev[i], sw_btn[SW_ID_GP][j], !GB(i*15+j+4,1));
346 
347  input_sync(sw->dev[i]);
348  }
349 
350  return 0;
351 
352  case SW_ID_PP:
353  case SW_ID_FFP:
354 
355  if (!sw_parity(GB(0,48)) || (hat = GB(42,4)) > 8)
356  return -1;
357 
358  dev = sw->dev[0];
359  input_report_abs(dev, ABS_X, GB( 9,10));
360  input_report_abs(dev, ABS_Y, GB(19,10));
361  input_report_abs(dev, ABS_RZ, GB(36, 6));
362  input_report_abs(dev, ABS_THROTTLE, GB(29, 7));
363 
364  input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
365  input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);
366 
367  for (j = 0; j < 9; j++)
368  input_report_key(dev, sw_btn[SW_ID_PP][j], !GB(j,1));
369 
370  input_sync(dev);
371 
372  return 0;
373 
374  case SW_ID_FSP:
375 
376  if (!sw_parity(GB(0,43)) || (hat = GB(28,4)) > 8)
377  return -1;
378 
379  dev = sw->dev[0];
380  input_report_abs(dev, ABS_X, GB( 0,10));
381  input_report_abs(dev, ABS_Y, GB(16,10));
382  input_report_abs(dev, ABS_THROTTLE, GB(32, 6));
383 
384  input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
385  input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);
386 
387  for (j = 0; j < 6; j++)
388  input_report_key(dev, sw_btn[SW_ID_FSP][j], !GB(j+10,1));
389 
390  input_report_key(dev, BTN_TR, !GB(26,1));
391  input_report_key(dev, BTN_START, !GB(27,1));
392  input_report_key(dev, BTN_MODE, !GB(38,1));
393  input_report_key(dev, BTN_SELECT, !GB(39,1));
394 
395  input_sync(dev);
396 
397  return 0;
398 
399  case SW_ID_FFW:
400 
401  if (!sw_parity(GB(0,33)))
402  return -1;
403 
404  dev = sw->dev[0];
405  input_report_abs(dev, ABS_RX, GB( 0,10));
406  input_report_abs(dev, ABS_RUDDER, GB(10, 6));
407  input_report_abs(dev, ABS_THROTTLE, GB(16, 6));
408 
409  for (j = 0; j < 8; j++)
410  input_report_key(dev, sw_btn[SW_ID_FFW][j], !GB(j+22,1));
411 
412  input_sync(dev);
413 
414  return 0;
415  }
416 
417  return -1;
418 }
419 
420 /*
421  * sw_read() reads SideWinder joystick data, and reinitializes
422  * the joystick in case of persistent problems. This is the function that is
423  * called from the generic code to poll the joystick.
424  */
425 
426 static int sw_read(struct sw *sw)
427 {
428  unsigned char buf[SW_LENGTH];
429  int i;
430 
431  i = sw_read_packet(sw->gameport, buf, sw->length, 0);
432 
433  if (sw->type == SW_ID_3DP && sw->length == 66 && i != 66) { /* Broken packet, try to fix */
434 
435  if (i == 64 && !sw_check(sw_get_bits(buf,0,64,1))) { /* Last init failed, 1 bit mode */
436  printk(KERN_WARNING "sidewinder.c: Joystick in wrong mode on %s"
437  " - going to reinitialize.\n", sw->gameport->phys);
438  sw->fail = SW_FAIL; /* Reinitialize */
439  i = 128; /* Bogus value */
440  }
441 
442  if (i < 66 && GB(0,64) == GB(i*3-66,64)) /* 1 == 3 */
443  i = 66; /* Everything is fine */
444 
445  if (i < 66 && GB(0,64) == GB(66,64)) /* 1 == 2 */
446  i = 66; /* Everything is fine */
447 
448  if (i < 66 && GB(i*3-132,64) == GB(i*3-66,64)) { /* 2 == 3 */
449  memmove(buf, buf + i - 22, 22); /* Move data */
450  i = 66; /* Carry on */
451  }
452  }
453 
454  if (i == sw->length && !sw_parse(buf, sw)) { /* Parse data */
455 
456  sw->fail = 0;
457  sw->ok++;
458 
459  if (sw->type == SW_ID_3DP && sw->length == 66 /* Many packets OK */
460  && sw->ok > SW_OK) {
461 
462  printk(KERN_INFO "sidewinder.c: No more trouble on %s"
463  " - enabling optimization again.\n", sw->gameport->phys);
464  sw->length = 22;
465  }
466 
467  return 0;
468  }
469 
470  sw->ok = 0;
471  sw->fail++;
472 
473  if (sw->type == SW_ID_3DP && sw->length == 22 && sw->fail > SW_BAD) { /* Consecutive bad packets */
474 
475  printk(KERN_INFO "sidewinder.c: Many bit errors on %s"
476  " - disabling optimization.\n", sw->gameport->phys);
477  sw->length = 66;
478  }
479 
480  if (sw->fail < SW_FAIL)
481  return -1; /* Not enough, don't reinitialize yet */
482 
483  printk(KERN_WARNING "sidewinder.c: Too many bit errors on %s"
484  " - reinitializing joystick.\n", sw->gameport->phys);
485 
486  if (!i && sw->type == SW_ID_3DP) { /* 3D Pro can be in analog mode */
487  mdelay(3 * SW_TIMEOUT);
488  sw_init_digital(sw->gameport);
489  }
490 
491  mdelay(SW_TIMEOUT);
492  i = sw_read_packet(sw->gameport, buf, SW_LENGTH, 0); /* Read normal data packet */
493  mdelay(SW_TIMEOUT);
494  sw_read_packet(sw->gameport, buf, SW_LENGTH, i); /* Read ID packet, this initializes the stick */
495 
496  sw->fail = SW_FAIL;
497 
498  return -1;
499 }
500 
501 static void sw_poll(struct gameport *gameport)
502 {
503  struct sw *sw = gameport_get_drvdata(gameport);
504 
505  sw->reads++;
506  if (sw_read(sw))
507  sw->bads++;
508 }
509 
510 static int sw_open(struct input_dev *dev)
511 {
512  struct sw *sw = input_get_drvdata(dev);
513 
514  gameport_start_polling(sw->gameport);
515  return 0;
516 }
517 
518 static void sw_close(struct input_dev *dev)
519 {
520  struct sw *sw = input_get_drvdata(dev);
521 
522  gameport_stop_polling(sw->gameport);
523 }
524 
525 /*
526  * sw_print_packet() prints the contents of a SideWinder packet.
527  */
528 
529 static void sw_print_packet(char *name, int length, unsigned char *buf, char bits)
530 {
531  int i;
532 
533  printk(KERN_INFO "sidewinder.c: %s packet, %d bits. [", name, length);
534  for (i = (((length + 3) >> 2) - 1); i >= 0; i--)
535  printk("%x", (int)sw_get_bits(buf, i << 2, 4, bits));
536  printk("]\n");
537 }
538 
539 /*
540  * sw_3dp_id() translates the 3DP id into a human legible string.
541  * Unfortunately I don't know how to do this for the other SW types.
542  */
543 
544 static void sw_3dp_id(unsigned char *buf, char *comment, size_t size)
545 {
546  int i;
547  char pnp[8], rev[9];
548 
549  for (i = 0; i < 7; i++) /* ASCII PnP ID */
550  pnp[i] = sw_get_bits(buf, 24+8*i, 8, 1);
551 
552  for (i = 0; i < 8; i++) /* ASCII firmware revision */
553  rev[i] = sw_get_bits(buf, 88+8*i, 8, 1);
554 
555  pnp[7] = rev[8] = 0;
556 
557  snprintf(comment, size, " [PnP %d.%02d id %s rev %s]",
558  (int) ((sw_get_bits(buf, 8, 6, 1) << 6) | /* Two 6-bit values */
559  sw_get_bits(buf, 16, 6, 1)) / 100,
560  (int) ((sw_get_bits(buf, 8, 6, 1) << 6) |
561  sw_get_bits(buf, 16, 6, 1)) % 100,
562  pnp, rev);
563 }
564 
565 /*
566  * sw_guess_mode() checks the upper two button bits for toggling -
567  * indication of that the joystick is in 3-bit mode. This is documented
568  * behavior for 3DP ID packet, and for example the FSP does this in
569  * normal packets instead. Fun ...
570  */
571 
572 static int sw_guess_mode(unsigned char *buf, int len)
573 {
574  int i;
575  unsigned char xor = 0;
576 
577  for (i = 1; i < len; i++)
578  xor |= (buf[i - 1] ^ buf[i]) & 6;
579 
580  return !!xor * 2 + 1;
581 }
582 
583 /*
584  * sw_connect() probes for SideWinder type joysticks.
585  */
586 
587 static int sw_connect(struct gameport *gameport, struct gameport_driver *drv)
588 {
589  struct sw *sw;
590  struct input_dev *input_dev;
591  int i, j, k, l;
592  int err = 0;
593  unsigned char *buf = NULL; /* [SW_LENGTH] */
594  unsigned char *idbuf = NULL; /* [SW_LENGTH] */
595  unsigned char m = 1;
596  char comment[40];
597 
598  comment[0] = 0;
599 
600  sw = kzalloc(sizeof(struct sw), GFP_KERNEL);
601  buf = kmalloc(SW_LENGTH, GFP_KERNEL);
602  idbuf = kmalloc(SW_LENGTH, GFP_KERNEL);
603  if (!sw || !buf || !idbuf) {
604  err = -ENOMEM;
605  goto fail1;
606  }
607 
608  sw->gameport = gameport;
609 
610  gameport_set_drvdata(gameport, sw);
611 
612  err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
613  if (err)
614  goto fail1;
615 
616  dbg("Init 0: Opened %s, io %#x, speed %d",
617  gameport->phys, gameport->io, gameport->speed);
618 
619  i = sw_read_packet(gameport, buf, SW_LENGTH, 0); /* Read normal packet */
620  msleep(SW_TIMEOUT);
621  dbg("Init 1: Mode %d. Length %d.", m , i);
622 
623  if (!i) { /* No data. 3d Pro analog mode? */
624  sw_init_digital(gameport); /* Switch to digital */
625  msleep(SW_TIMEOUT);
626  i = sw_read_packet(gameport, buf, SW_LENGTH, 0); /* Retry reading packet */
627  msleep(SW_TIMEOUT);
628  dbg("Init 1b: Length %d.", i);
629  if (!i) { /* No data -> FAIL */
630  err = -ENODEV;
631  goto fail2;
632  }
633  }
634 
635  j = sw_read_packet(gameport, idbuf, SW_LENGTH, i); /* Read ID. This initializes the stick */
636  m |= sw_guess_mode(idbuf, j); /* ID packet should carry mode info [3DP] */
637  dbg("Init 2: Mode %d. ID Length %d.", m, j);
638 
639  if (j <= 0) { /* Read ID failed. Happens in 1-bit mode on PP */
640  msleep(SW_TIMEOUT);
641  i = sw_read_packet(gameport, buf, SW_LENGTH, 0); /* Retry reading packet */
642  m |= sw_guess_mode(buf, i);
643  dbg("Init 2b: Mode %d. Length %d.", m, i);
644  if (!i) {
645  err = -ENODEV;
646  goto fail2;
647  }
648  msleep(SW_TIMEOUT);
649  j = sw_read_packet(gameport, idbuf, SW_LENGTH, i); /* Retry reading ID */
650  dbg("Init 2c: ID Length %d.", j);
651  }
652 
653  sw->type = -1;
654  k = SW_FAIL; /* Try SW_FAIL times */
655  l = 0;
656 
657  do {
658  k--;
659  msleep(SW_TIMEOUT);
660  i = sw_read_packet(gameport, buf, SW_LENGTH, 0); /* Read data packet */
661  dbg("Init 3: Mode %d. Length %d. Last %d. Tries %d.", m, i, l, k);
662 
663  if (i > l) { /* Longer? As we can only lose bits, it makes */
664  /* no sense to try detection for a packet shorter */
665  l = i; /* than the previous one */
666 
667  sw->number = 1;
668  sw->gameport = gameport;
669  sw->length = i;
670  sw->bits = m;
671 
672  dbg("Init 3a: Case %d.\n", i * m);
673 
674  switch (i * m) {
675  case 60:
676  sw->number++;
677  case 45: /* Ambiguous packet length */
678  if (j <= 40) { /* ID length less or eq 40 -> FSP */
679  case 43:
680  sw->type = SW_ID_FSP;
681  break;
682  }
683  sw->number++;
684  case 30:
685  sw->number++;
686  case 15:
687  sw->type = SW_ID_GP;
688  break;
689  case 33:
690  case 31:
691  sw->type = SW_ID_FFW;
692  break;
693  case 48: /* Ambiguous */
694  if (j == 14) { /* ID length 14*3 -> FFP */
695  sw->type = SW_ID_FFP;
696  sprintf(comment, " [AC %s]", sw_get_bits(idbuf,38,1,3) ? "off" : "on");
697  } else
698  sw->type = SW_ID_PP;
699  break;
700  case 66:
701  sw->bits = 3;
702  case 198:
703  sw->length = 22;
704  case 64:
705  sw->type = SW_ID_3DP;
706  if (j == 160)
707  sw_3dp_id(idbuf, comment, sizeof(comment));
708  break;
709  }
710  }
711 
712  } while (k && sw->type == -1);
713 
714  if (sw->type == -1) {
715  printk(KERN_WARNING "sidewinder.c: unknown joystick device detected "
716  "on %s, contact <[email protected]>\n", gameport->phys);
717  sw_print_packet("ID", j * 3, idbuf, 3);
718  sw_print_packet("Data", i * m, buf, m);
719  err = -ENODEV;
720  goto fail2;
721  }
722 
723 #ifdef SW_DEBUG
724  sw_print_packet("ID", j * 3, idbuf, 3);
725  sw_print_packet("Data", i * m, buf, m);
726 #endif
727 
728  gameport_set_poll_handler(gameport, sw_poll);
729  gameport_set_poll_interval(gameport, 20);
730 
731  k = i;
732  l = j;
733 
734  for (i = 0; i < sw->number; i++) {
735  int bits, code;
736 
737  snprintf(sw->name, sizeof(sw->name),
738  "Microsoft SideWinder %s", sw_name[sw->type]);
739  snprintf(sw->phys[i], sizeof(sw->phys[i]),
740  "%s/input%d", gameport->phys, i);
741 
742  sw->dev[i] = input_dev = input_allocate_device();
743  if (!input_dev) {
744  err = -ENOMEM;
745  goto fail3;
746  }
747 
748  input_dev->name = sw->name;
749  input_dev->phys = sw->phys[i];
750  input_dev->id.bustype = BUS_GAMEPORT;
751  input_dev->id.vendor = GAMEPORT_ID_VENDOR_MICROSOFT;
752  input_dev->id.product = sw->type;
753  input_dev->id.version = 0x0100;
754  input_dev->dev.parent = &gameport->dev;
755 
756  input_set_drvdata(input_dev, sw);
757 
758  input_dev->open = sw_open;
759  input_dev->close = sw_close;
760 
761  input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
762 
763  for (j = 0; (bits = sw_bit[sw->type][j]); j++) {
764  int min, max, fuzz, flat;
765 
766  code = sw_abs[sw->type][j];
767  min = bits == 1 ? -1 : 0;
768  max = (1 << bits) - 1;
769  fuzz = (bits >> 1) >= 2 ? 1 << ((bits >> 1) - 2) : 0;
770  flat = code == ABS_THROTTLE || bits < 5 ?
771  0 : 1 << (bits - 5);
772 
773  input_set_abs_params(input_dev, code,
774  min, max, fuzz, flat);
775  }
776 
777  for (j = 0; (code = sw_btn[sw->type][j]); j++)
778  __set_bit(code, input_dev->keybit);
779 
780  dbg("%s%s [%d-bit id %d data %d]\n", sw->name, comment, m, l, k);
781 
782  err = input_register_device(sw->dev[i]);
783  if (err)
784  goto fail4;
785  }
786 
787  out: kfree(buf);
788  kfree(idbuf);
789 
790  return err;
791 
792  fail4: input_free_device(sw->dev[i]);
793  fail3: while (--i >= 0)
794  input_unregister_device(sw->dev[i]);
795  fail2: gameport_close(gameport);
796  fail1: gameport_set_drvdata(gameport, NULL);
797  kfree(sw);
798  goto out;
799 }
800 
801 static void sw_disconnect(struct gameport *gameport)
802 {
803  struct sw *sw = gameport_get_drvdata(gameport);
804  int i;
805 
806  for (i = 0; i < sw->number; i++)
807  input_unregister_device(sw->dev[i]);
808  gameport_close(gameport);
809  gameport_set_drvdata(gameport, NULL);
810  kfree(sw);
811 }
812 
813 static struct gameport_driver sw_drv = {
814  .driver = {
815  .name = "sidewinder",
816  .owner = THIS_MODULE,
817  },
818  .description = DRIVER_DESC,
819  .connect = sw_connect,
820  .disconnect = sw_disconnect,
821 };
822 
823 module_gameport_driver(sw_drv);
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