drivers/input/joystick/sidewinder.c

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This source file includes following definitions.
sw_read_packet
sw_get_bits
sw_init_digital
sw_parity
sw_check
sw_parse
sw_read
sw_poll
sw_open
sw_close
sw_print_packet
sw_3dp_id
sw_guess_mode
sw_connect
sw_disconnect
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) 1998-2005 Vojtech Pavlik
   4  */
   5 
   6 /*
   7  * Microsoft SideWinder joystick family driver for Linux
   8  */
   9 
  10 /*
  11  */
  12 
  13 #include <linux/delay.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/input.h>
  18 #include <linux/gameport.h>
  19 #include <linux/jiffies.h>
  20 
  21 #define DRIVER_DESC     "Microsoft SideWinder joystick family driver"
  22 
  23 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  24 MODULE_DESCRIPTION(DRIVER_DESC);
  25 MODULE_LICENSE("GPL");
  26 
  27 /*
  28  * These are really magic values. Changing them can make a problem go away,
  29  * as well as break everything.
  30  */
  31 
  32 #undef SW_DEBUG
  33 #undef SW_DEBUG_DATA
  34 
  35 #define SW_START        600     /* The time we wait for the first bit [600 us] */
  36 #define SW_STROBE       60      /* Max time per bit [60 us] */
  37 #define SW_TIMEOUT      6       /* Wait for everything to settle [6 ms] */
  38 #define SW_KICK         45      /* Wait after A0 fall till kick [45 us] */
  39 #define SW_END          8       /* Number of bits before end of packet to kick */
  40 #define SW_FAIL         16      /* Number of packet read errors to fail and reinitialize */
  41 #define SW_BAD          2       /* Number of packet read errors to switch off 3d Pro optimization */
  42 #define SW_OK           64      /* Number of packet read successes to switch optimization back on */
  43 #define SW_LENGTH       512     /* Max number of bits in a packet */
  44 
  45 #ifdef SW_DEBUG
  46 #define dbg(format, arg...) printk(KERN_DEBUG __FILE__ ": " format "\n" , ## arg)
  47 #else
  48 #define dbg(format, arg...) do {} while (0)
  49 #endif
  50 
  51 /*
  52  * SideWinder joystick types ...
  53  */
  54 
  55 #define SW_ID_3DP       0
  56 #define SW_ID_GP        1
  57 #define SW_ID_PP        2
  58 #define SW_ID_FFP       3
  59 #define SW_ID_FSP       4
  60 #define SW_ID_FFW       5
  61 
  62 /*
  63  * Names, buttons, axes ...
  64  */
  65 
  66 static char *sw_name[] = {      "3D Pro", "GamePad", "Precision Pro", "Force Feedback Pro", "FreeStyle Pro",
  67                                 "Force Feedback Wheel" };
  68 
  69 static char sw_abs[][7] = {
  70         { ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
  71         { ABS_X, ABS_Y },
  72         { ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
  73         { ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
  74         { ABS_X, ABS_Y,         ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
  75         { ABS_RX, ABS_RUDDER,   ABS_THROTTLE }};
  76 
  77 static char sw_bit[][7] = {
  78         { 10, 10,  9, 10,  1,  1 },
  79         {  1,  1                 },
  80         { 10, 10,  6,  7,  1,  1 },
  81         { 10, 10,  6,  7,  1,  1 },
  82         { 10, 10,  6,  1,  1     },
  83         { 10,  7,  7,  1,  1     }};
  84 
  85 static short sw_btn[][12] = {
  86         { BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_THUMB2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_MODE },
  87         { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_START, BTN_MODE },
  88         { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_SELECT },
  89         { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_SELECT },
  90         { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_START, BTN_MODE, BTN_SELECT },
  91         { BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_THUMB2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4 }};
  92 
  93 static struct {
  94         int x;
  95         int y;
  96 } sw_hat_to_axis[] = {{ 0, 0}, { 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
  97 
  98 struct sw {
  99         struct gameport *gameport;
 100         struct input_dev *dev[4];
 101         char name[64];
 102         char phys[4][32];
 103         int length;
 104         int type;
 105         int bits;
 106         int number;
 107         int fail;
 108         int ok;
 109         int reads;
 110         int bads;
 111 };
 112 
 113 /*
 114  * sw_read_packet() is a function which reads either a data packet, or an
 115  * identification packet from a SideWinder joystick. The protocol is very,
 116  * very, very braindamaged. Microsoft patented it in US patent #5628686.
 117  */
 118 
 119 static int sw_read_packet(struct gameport *gameport, unsigned char *buf, int length, int id)
 120 {
 121         unsigned long flags;
 122         int timeout, bitout, sched, i, kick, start, strobe;
 123         unsigned char pending, u, v;
 124 
 125         i = -id;                                                /* Don't care about data, only want ID */
 126         timeout = id ? gameport_time(gameport, SW_TIMEOUT * 1000) : 0; /* Set up global timeout for ID packet */
 127         kick = id ? gameport_time(gameport, SW_KICK) : 0;       /* Set up kick timeout for ID packet */
 128         start = gameport_time(gameport, SW_START);
 129         strobe = gameport_time(gameport, SW_STROBE);
 130         bitout = start;
 131         pending = 0;
 132         sched = 0;
 133 
 134         local_irq_save(flags);                                  /* Quiet, please */
 135 
 136         gameport_trigger(gameport);                             /* Trigger */
 137         v = gameport_read(gameport);
 138 
 139         do {
 140                 bitout--;
 141                 u = v;
 142                 v = gameport_read(gameport);
 143         } while (!(~v & u & 0x10) && (bitout > 0));             /* Wait for first falling edge on clock */
 144 
 145         if (bitout > 0)
 146                 bitout = strobe;                                /* Extend time if not timed out */
 147 
 148         while ((timeout > 0 || bitout > 0) && (i < length)) {
 149 
 150                 timeout--;
 151                 bitout--;                                       /* Decrement timers */
 152                 sched--;
 153 
 154                 u = v;
 155                 v = gameport_read(gameport);
 156 
 157                 if ((~u & v & 0x10) && (bitout > 0)) {          /* Rising edge on clock - data bit */
 158                         if (i >= 0)                             /* Want this data */
 159                                 buf[i] = v >> 5;                /* Store it */
 160                         i++;                                    /* Advance index */
 161                         bitout = strobe;                        /* Extend timeout for next bit */
 162                 }
 163 
 164                 if (kick && (~v & u & 0x01)) {                  /* Falling edge on axis 0 */
 165                         sched = kick;                           /* Schedule second trigger */
 166                         kick = 0;                               /* Don't schedule next time on falling edge */
 167                         pending = 1;                            /* Mark schedule */
 168                 }
 169 
 170                 if (pending && sched < 0 && (i > -SW_END)) {    /* Second trigger time */
 171                         gameport_trigger(gameport);             /* Trigger */
 172                         bitout = start;                         /* Long bit timeout */
 173                         pending = 0;                            /* Unmark schedule */
 174                         timeout = 0;                            /* Switch from global to bit timeouts */
 175                 }
 176         }
 177 
 178         local_irq_restore(flags);                                       /* Done - relax */
 179 
 180 #ifdef SW_DEBUG_DATA
 181         {
 182                 int j;
 183                 printk(KERN_DEBUG "sidewinder.c: Read %d triplets. [", i);
 184                 for (j = 0; j < i; j++) printk("%d", buf[j]);
 185                 printk("]\n");
 186         }
 187 #endif
 188 
 189         return i;
 190 }
 191 
 192 /*
 193  * sw_get_bits() and GB() compose bits from the triplet buffer into a __u64.
 194  * Parameter 'pos' is bit number inside packet where to start at, 'num' is number
 195  * of bits to be read, 'shift' is offset in the resulting __u64 to start at, bits
 196  * is number of bits per triplet.
 197  */
 198 
 199 #define GB(pos,num) sw_get_bits(buf, pos, num, sw->bits)
 200 
 201 static __u64 sw_get_bits(unsigned char *buf, int pos, int num, char bits)
 202 {
 203         __u64 data = 0;
 204         int tri = pos % bits;                                           /* Start position */
 205         int i   = pos / bits;
 206         int bit = 0;
 207 
 208         while (num--) {
 209                 data |= (__u64)((buf[i] >> tri++) & 1) << bit++;        /* Transfer bit */
 210                 if (tri == bits) {
 211                         i++;                                            /* Next triplet */
 212                         tri = 0;
 213                 }
 214         }
 215 
 216         return data;
 217 }
 218 
 219 /*
 220  * sw_init_digital() initializes a SideWinder 3D Pro joystick
 221  * into digital mode.
 222  */
 223 
 224 static void sw_init_digital(struct gameport *gameport)
 225 {
 226         static const int seq[] = { 140, 140+725, 140+300, 0 };
 227         unsigned long flags;
 228         int i, t;
 229 
 230         local_irq_save(flags);
 231 
 232         i = 0;
 233         do {
 234                 gameport_trigger(gameport);                     /* Trigger */
 235                 t = gameport_time(gameport, SW_TIMEOUT * 1000);
 236                 while ((gameport_read(gameport) & 1) && t) t--; /* Wait for axis to fall back to 0 */
 237                 udelay(seq[i]);                                 /* Delay magic time */
 238         } while (seq[++i]);
 239 
 240         gameport_trigger(gameport);                             /* Last trigger */
 241 
 242         local_irq_restore(flags);
 243 }
 244 
 245 /*
 246  * sw_parity() computes parity of __u64
 247  */
 248 
 249 static int sw_parity(__u64 t)
 250 {
 251         int x = t ^ (t >> 32);
 252 
 253         x ^= x >> 16;
 254         x ^= x >> 8;
 255         x ^= x >> 4;
 256         x ^= x >> 2;
 257         x ^= x >> 1;
 258         return x & 1;
 259 }
 260 
 261 /*
 262  * sw_ccheck() checks synchronization bits and computes checksum of nibbles.
 263  */
 264 
 265 static int sw_check(__u64 t)
 266 {
 267         unsigned char sum = 0;
 268 
 269         if ((t & 0x8080808080808080ULL) ^ 0x80)                 /* Sync */
 270                 return -1;
 271 
 272         while (t) {                                             /* Sum */
 273                 sum += t & 0xf;
 274                 t >>= 4;
 275         }
 276 
 277         return sum & 0xf;
 278 }
 279 
 280 /*
 281  * sw_parse() analyzes SideWinder joystick data, and writes the results into
 282  * the axes and buttons arrays.
 283  */
 284 
 285 static int sw_parse(unsigned char *buf, struct sw *sw)
 286 {
 287         int hat, i, j;
 288         struct input_dev *dev;
 289 
 290         switch (sw->type) {
 291 
 292                 case SW_ID_3DP:
 293 
 294                         if (sw_check(GB(0,64)) || (hat = (GB(6,1) << 3) | GB(60,3)) > 8)
 295                                 return -1;
 296 
 297                         dev = sw->dev[0];
 298 
 299                         input_report_abs(dev, ABS_X,        (GB( 3,3) << 7) | GB(16,7));
 300                         input_report_abs(dev, ABS_Y,        (GB( 0,3) << 7) | GB(24,7));
 301                         input_report_abs(dev, ABS_RZ,       (GB(35,2) << 7) | GB(40,7));
 302                         input_report_abs(dev, ABS_THROTTLE, (GB(32,3) << 7) | GB(48,7));
 303 
 304                         input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
 305                         input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);
 306 
 307                         for (j = 0; j < 7; j++)
 308                                 input_report_key(dev, sw_btn[SW_ID_3DP][j], !GB(j+8,1));
 309 
 310                         input_report_key(dev, BTN_BASE4, !GB(38,1));
 311                         input_report_key(dev, BTN_BASE5, !GB(37,1));
 312 
 313                         input_sync(dev);
 314 
 315                         return 0;
 316 
 317                 case SW_ID_GP:
 318 
 319                         for (i = 0; i < sw->number; i ++) {
 320 
 321                                 if (sw_parity(GB(i*15,15)))
 322                                         return -1;
 323 
 324                                 input_report_abs(sw->dev[i], ABS_X, GB(i*15+3,1) - GB(i*15+2,1));
 325                                 input_report_abs(sw->dev[i], ABS_Y, GB(i*15+0,1) - GB(i*15+1,1));
 326 
 327                                 for (j = 0; j < 10; j++)
 328                                         input_report_key(sw->dev[i], sw_btn[SW_ID_GP][j], !GB(i*15+j+4,1));
 329 
 330                                 input_sync(sw->dev[i]);
 331                         }
 332 
 333                         return 0;
 334 
 335                 case SW_ID_PP:
 336                 case SW_ID_FFP:
 337 
 338                         if (!sw_parity(GB(0,48)) || (hat = GB(42,4)) > 8)
 339                                 return -1;
 340 
 341                         dev = sw->dev[0];
 342                         input_report_abs(dev, ABS_X,        GB( 9,10));
 343                         input_report_abs(dev, ABS_Y,        GB(19,10));
 344                         input_report_abs(dev, ABS_RZ,       GB(36, 6));
 345                         input_report_abs(dev, ABS_THROTTLE, GB(29, 7));
 346 
 347                         input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
 348                         input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);
 349 
 350                         for (j = 0; j < 9; j++)
 351                                 input_report_key(dev, sw_btn[SW_ID_PP][j], !GB(j,1));
 352 
 353                         input_sync(dev);
 354 
 355                         return 0;
 356 
 357                 case SW_ID_FSP:
 358 
 359                         if (!sw_parity(GB(0,43)) || (hat = GB(28,4)) > 8)
 360                                 return -1;
 361 
 362                         dev = sw->dev[0];
 363                         input_report_abs(dev, ABS_X,        GB( 0,10));
 364                         input_report_abs(dev, ABS_Y,        GB(16,10));
 365                         input_report_abs(dev, ABS_THROTTLE, GB(32, 6));
 366 
 367                         input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
 368                         input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);
 369 
 370                         for (j = 0; j < 6; j++)
 371                                 input_report_key(dev, sw_btn[SW_ID_FSP][j], !GB(j+10,1));
 372 
 373                         input_report_key(dev, BTN_TR,     !GB(26,1));
 374                         input_report_key(dev, BTN_START,  !GB(27,1));
 375                         input_report_key(dev, BTN_MODE,   !GB(38,1));
 376                         input_report_key(dev, BTN_SELECT, !GB(39,1));
 377 
 378                         input_sync(dev);
 379 
 380                         return 0;
 381 
 382                 case SW_ID_FFW:
 383 
 384                         if (!sw_parity(GB(0,33)))
 385                                 return -1;
 386 
 387                         dev = sw->dev[0];
 388                         input_report_abs(dev, ABS_RX,       GB( 0,10));
 389                         input_report_abs(dev, ABS_RUDDER,   GB(10, 6));
 390                         input_report_abs(dev, ABS_THROTTLE, GB(16, 6));
 391 
 392                         for (j = 0; j < 8; j++)
 393                                 input_report_key(dev, sw_btn[SW_ID_FFW][j], !GB(j+22,1));
 394 
 395                         input_sync(dev);
 396 
 397                         return 0;
 398         }
 399 
 400         return -1;
 401 }
 402 
 403 /*
 404  * sw_read() reads SideWinder joystick data, and reinitializes
 405  * the joystick in case of persistent problems. This is the function that is
 406  * called from the generic code to poll the joystick.
 407  */
 408 
 409 static int sw_read(struct sw *sw)
 410 {
 411         unsigned char buf[SW_LENGTH];
 412         int i;
 413 
 414         i = sw_read_packet(sw->gameport, buf, sw->length, 0);
 415 
 416         if (sw->type == SW_ID_3DP && sw->length == 66 && i != 66) {             /* Broken packet, try to fix */
 417 
 418                 if (i == 64 && !sw_check(sw_get_bits(buf,0,64,1))) {            /* Last init failed, 1 bit mode */
 419                         printk(KERN_WARNING "sidewinder.c: Joystick in wrong mode on %s"
 420                                 " - going to reinitialize.\n", sw->gameport->phys);
 421                         sw->fail = SW_FAIL;                                     /* Reinitialize */
 422                         i = 128;                                                /* Bogus value */
 423                 }
 424 
 425                 if (i < 66 && GB(0,64) == GB(i*3-66,64))                        /* 1 == 3 */
 426                         i = 66;                                                 /* Everything is fine */
 427 
 428                 if (i < 66 && GB(0,64) == GB(66,64))                            /* 1 == 2 */
 429                         i = 66;                                                 /* Everything is fine */
 430 
 431                 if (i < 66 && GB(i*3-132,64) == GB(i*3-66,64)) {                /* 2 == 3 */
 432                         memmove(buf, buf + i - 22, 22);                         /* Move data */
 433                         i = 66;                                                 /* Carry on */
 434                 }
 435         }
 436 
 437         if (i == sw->length && !sw_parse(buf, sw)) {                            /* Parse data */
 438 
 439                 sw->fail = 0;
 440                 sw->ok++;
 441 
 442                 if (sw->type == SW_ID_3DP && sw->length == 66                   /* Many packets OK */
 443                         && sw->ok > SW_OK) {
 444 
 445                         printk(KERN_INFO "sidewinder.c: No more trouble on %s"
 446                                 " - enabling optimization again.\n", sw->gameport->phys);
 447                         sw->length = 22;
 448                 }
 449 
 450                 return 0;
 451         }
 452 
 453         sw->ok = 0;
 454         sw->fail++;
 455 
 456         if (sw->type == SW_ID_3DP && sw->length == 22 && sw->fail > SW_BAD) {   /* Consecutive bad packets */
 457 
 458                 printk(KERN_INFO "sidewinder.c: Many bit errors on %s"
 459                         " - disabling optimization.\n", sw->gameport->phys);
 460                 sw->length = 66;
 461         }
 462 
 463         if (sw->fail < SW_FAIL)
 464                 return -1;                                                      /* Not enough, don't reinitialize yet */
 465 
 466         printk(KERN_WARNING "sidewinder.c: Too many bit errors on %s"
 467                 " - reinitializing joystick.\n", sw->gameport->phys);
 468 
 469         if (!i && sw->type == SW_ID_3DP) {                                      /* 3D Pro can be in analog mode */
 470                 mdelay(3 * SW_TIMEOUT);
 471                 sw_init_digital(sw->gameport);
 472         }
 473 
 474         mdelay(SW_TIMEOUT);
 475         i = sw_read_packet(sw->gameport, buf, SW_LENGTH, 0);                    /* Read normal data packet */
 476         mdelay(SW_TIMEOUT);
 477         sw_read_packet(sw->gameport, buf, SW_LENGTH, i);                        /* Read ID packet, this initializes the stick */
 478 
 479         sw->fail = SW_FAIL;
 480 
 481         return -1;
 482 }
 483 
 484 static void sw_poll(struct gameport *gameport)
 485 {
 486         struct sw *sw = gameport_get_drvdata(gameport);
 487 
 488         sw->reads++;
 489         if (sw_read(sw))
 490                 sw->bads++;
 491 }
 492 
 493 static int sw_open(struct input_dev *dev)
 494 {
 495         struct sw *sw = input_get_drvdata(dev);
 496 
 497         gameport_start_polling(sw->gameport);
 498         return 0;
 499 }
 500 
 501 static void sw_close(struct input_dev *dev)
 502 {
 503         struct sw *sw = input_get_drvdata(dev);
 504 
 505         gameport_stop_polling(sw->gameport);
 506 }
 507 
 508 /*
 509  * sw_print_packet() prints the contents of a SideWinder packet.
 510  */
 511 
 512 static void sw_print_packet(char *name, int length, unsigned char *buf, char bits)
 513 {
 514         int i;
 515 
 516         printk(KERN_INFO "sidewinder.c: %s packet, %d bits. [", name, length);
 517         for (i = (((length + 3) >> 2) - 1); i >= 0; i--)
 518                 printk("%x", (int)sw_get_bits(buf, i << 2, 4, bits));
 519         printk("]\n");
 520 }
 521 
 522 /*
 523  * sw_3dp_id() translates the 3DP id into a human legible string.
 524  * Unfortunately I don't know how to do this for the other SW types.
 525  */
 526 
 527 static void sw_3dp_id(unsigned char *buf, char *comment, size_t size)
 528 {
 529         int i;
 530         char pnp[8], rev[9];
 531 
 532         for (i = 0; i < 7; i++)                                         /* ASCII PnP ID */
 533                 pnp[i] = sw_get_bits(buf, 24+8*i, 8, 1);
 534 
 535         for (i = 0; i < 8; i++)                                         /* ASCII firmware revision */
 536                 rev[i] = sw_get_bits(buf, 88+8*i, 8, 1);
 537 
 538         pnp[7] = rev[8] = 0;
 539 
 540         snprintf(comment, size, " [PnP %d.%02d id %s rev %s]",
 541                 (int) ((sw_get_bits(buf, 8, 6, 1) << 6) |               /* Two 6-bit values */
 542                         sw_get_bits(buf, 16, 6, 1)) / 100,
 543                 (int) ((sw_get_bits(buf, 8, 6, 1) << 6) |
 544                         sw_get_bits(buf, 16, 6, 1)) % 100,
 545                  pnp, rev);
 546 }
 547 
 548 /*
 549  * sw_guess_mode() checks the upper two button bits for toggling -
 550  * indication of that the joystick is in 3-bit mode. This is documented
 551  * behavior for 3DP ID packet, and for example the FSP does this in
 552  * normal packets instead. Fun ...
 553  */
 554 
 555 static int sw_guess_mode(unsigned char *buf, int len)
 556 {
 557         int i;
 558         unsigned char xor = 0;
 559 
 560         for (i = 1; i < len; i++)
 561                 xor |= (buf[i - 1] ^ buf[i]) & 6;
 562 
 563         return !!xor * 2 + 1;
 564 }
 565 
 566 /*
 567  * sw_connect() probes for SideWinder type joysticks.
 568  */
 569 
 570 static int sw_connect(struct gameport *gameport, struct gameport_driver *drv)
 571 {
 572         struct sw *sw;
 573         struct input_dev *input_dev;
 574         int i, j, k, l;
 575         int err = 0;
 576         unsigned char *buf = NULL;      /* [SW_LENGTH] */
 577         unsigned char *idbuf = NULL;    /* [SW_LENGTH] */
 578         unsigned char m = 1;
 579         char comment[40];
 580 
 581         comment[0] = 0;
 582 
 583         sw = kzalloc(sizeof(struct sw), GFP_KERNEL);
 584         buf = kmalloc(SW_LENGTH, GFP_KERNEL);
 585         idbuf = kmalloc(SW_LENGTH, GFP_KERNEL);
 586         if (!sw || !buf || !idbuf) {
 587                 err = -ENOMEM;
 588                 goto fail1;
 589         }
 590 
 591         sw->gameport = gameport;
 592 
 593         gameport_set_drvdata(gameport, sw);
 594 
 595         err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
 596         if (err)
 597                 goto fail1;
 598 
 599         dbg("Init 0: Opened %s, io %#x, speed %d",
 600                 gameport->phys, gameport->io, gameport->speed);
 601 
 602         i = sw_read_packet(gameport, buf, SW_LENGTH, 0);                /* Read normal packet */
 603         msleep(SW_TIMEOUT);
 604         dbg("Init 1: Mode %d. Length %d.", m , i);
 605 
 606         if (!i) {                                                       /* No data. 3d Pro analog mode? */
 607                 sw_init_digital(gameport);                              /* Switch to digital */
 608                 msleep(SW_TIMEOUT);
 609                 i = sw_read_packet(gameport, buf, SW_LENGTH, 0);        /* Retry reading packet */
 610                 msleep(SW_TIMEOUT);
 611                 dbg("Init 1b: Length %d.", i);
 612                 if (!i) {                                               /* No data -> FAIL */
 613                         err = -ENODEV;
 614                         goto fail2;
 615                 }
 616         }
 617 
 618         j = sw_read_packet(gameport, idbuf, SW_LENGTH, i);              /* Read ID. This initializes the stick */
 619         m |= sw_guess_mode(idbuf, j);                                   /* ID packet should carry mode info [3DP] */
 620         dbg("Init 2: Mode %d. ID Length %d.", m, j);
 621 
 622         if (j <= 0) {                                                   /* Read ID failed. Happens in 1-bit mode on PP */
 623                 msleep(SW_TIMEOUT);
 624                 i = sw_read_packet(gameport, buf, SW_LENGTH, 0);        /* Retry reading packet */
 625                 m |= sw_guess_mode(buf, i);
 626                 dbg("Init 2b: Mode %d. Length %d.", m, i);
 627                 if (!i) {
 628                         err = -ENODEV;
 629                         goto fail2;
 630                 }
 631                 msleep(SW_TIMEOUT);
 632                 j = sw_read_packet(gameport, idbuf, SW_LENGTH, i);      /* Retry reading ID */
 633                 dbg("Init 2c: ID Length %d.", j);
 634         }
 635 
 636         sw->type = -1;
 637         k = SW_FAIL;                                                    /* Try SW_FAIL times */
 638         l = 0;
 639 
 640         do {
 641                 k--;
 642                 msleep(SW_TIMEOUT);
 643                 i = sw_read_packet(gameport, buf, SW_LENGTH, 0);        /* Read data packet */
 644                 dbg("Init 3: Mode %d. Length %d. Last %d. Tries %d.", m, i, l, k);
 645 
 646                 if (i > l) {                                            /* Longer? As we can only lose bits, it makes */
 647                                                                         /* no sense to try detection for a packet shorter */
 648                         l = i;                                          /* than the previous one */
 649 
 650                         sw->number = 1;
 651                         sw->gameport = gameport;
 652                         sw->length = i;
 653                         sw->bits = m;
 654 
 655                         dbg("Init 3a: Case %d.\n", i * m);
 656 
 657                         switch (i * m) {
 658                                 case 60:
 659                                         sw->number++;                   /* fall through */
 660                                 case 45:                                /* Ambiguous packet length */
 661                                         if (j <= 40) {                  /* ID length less or eq 40 -> FSP */
 662                                 case 43:
 663                                                 sw->type = SW_ID_FSP;
 664                                                 break;
 665                                         }
 666                                         sw->number++;                   /* fall through */
 667                                 case 30:
 668                                         sw->number++;                   /* fall through */
 669                                 case 15:
 670                                         sw->type = SW_ID_GP;
 671                                         break;
 672                                 case 33:
 673                                 case 31:
 674                                         sw->type = SW_ID_FFW;
 675                                         break;
 676                                 case 48:                                /* Ambiguous */
 677                                         if (j == 14) {                  /* ID length 14*3 -> FFP */
 678                                                 sw->type = SW_ID_FFP;
 679                                                 sprintf(comment, " [AC %s]", sw_get_bits(idbuf,38,1,3) ? "off" : "on");
 680                                         } else
 681                                                 sw->type = SW_ID_PP;
 682                                         break;
 683                                 case 66:
 684                                         sw->bits = 3;                   /* fall through */
 685                                 case 198:
 686                                         sw->length = 22;                /* fall through */
 687                                 case 64:
 688                                         sw->type = SW_ID_3DP;
 689                                         if (j == 160)
 690                                                 sw_3dp_id(idbuf, comment, sizeof(comment));
 691                                         break;
 692                         }
 693                 }
 694 
 695         } while (k && sw->type == -1);
 696 
 697         if (sw->type == -1) {
 698                 printk(KERN_WARNING "sidewinder.c: unknown joystick device detected "
 699                         "on %s, contact <vojtech@ucw.cz>\n", gameport->phys);
 700                 sw_print_packet("ID", j * 3, idbuf, 3);
 701                 sw_print_packet("Data", i * m, buf, m);
 702                 err = -ENODEV;
 703                 goto fail2;
 704         }
 705 
 706 #ifdef SW_DEBUG
 707         sw_print_packet("ID", j * 3, idbuf, 3);
 708         sw_print_packet("Data", i * m, buf, m);
 709 #endif
 710 
 711         gameport_set_poll_handler(gameport, sw_poll);
 712         gameport_set_poll_interval(gameport, 20);
 713 
 714         k = i;
 715         l = j;
 716 
 717         for (i = 0; i < sw->number; i++) {
 718                 int bits, code;
 719 
 720                 snprintf(sw->name, sizeof(sw->name),
 721                          "Microsoft SideWinder %s", sw_name[sw->type]);
 722                 snprintf(sw->phys[i], sizeof(sw->phys[i]),
 723                          "%s/input%d", gameport->phys, i);
 724 
 725                 sw->dev[i] = input_dev = input_allocate_device();
 726                 if (!input_dev) {
 727                         err = -ENOMEM;
 728                         goto fail3;
 729                 }
 730 
 731                 input_dev->name = sw->name;
 732                 input_dev->phys = sw->phys[i];
 733                 input_dev->id.bustype = BUS_GAMEPORT;
 734                 input_dev->id.vendor = GAMEPORT_ID_VENDOR_MICROSOFT;
 735                 input_dev->id.product = sw->type;
 736                 input_dev->id.version = 0x0100;
 737                 input_dev->dev.parent = &gameport->dev;
 738 
 739                 input_set_drvdata(input_dev, sw);
 740 
 741                 input_dev->open = sw_open;
 742                 input_dev->close = sw_close;
 743 
 744                 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 745 
 746                 for (j = 0; (bits = sw_bit[sw->type][j]); j++) {
 747                         int min, max, fuzz, flat;
 748 
 749                         code = sw_abs[sw->type][j];
 750                         min = bits == 1 ? -1 : 0;
 751                         max = (1 << bits) - 1;
 752                         fuzz = (bits >> 1) >= 2 ? 1 << ((bits >> 1) - 2) : 0;
 753                         flat = code == ABS_THROTTLE || bits < 5 ?
 754                                 0 : 1 << (bits - 5);
 755 
 756                         input_set_abs_params(input_dev, code,
 757                                              min, max, fuzz, flat);
 758                 }
 759 
 760                 for (j = 0; (code = sw_btn[sw->type][j]); j++)
 761                         __set_bit(code, input_dev->keybit);
 762 
 763                 dbg("%s%s [%d-bit id %d data %d]\n", sw->name, comment, m, l, k);
 764 
 765                 err = input_register_device(sw->dev[i]);
 766                 if (err)
 767                         goto fail4;
 768         }
 769 
 770  out:   kfree(buf);
 771         kfree(idbuf);
 772 
 773         return err;
 774 
 775  fail4: input_free_device(sw->dev[i]);
 776  fail3: while (--i >= 0)
 777                 input_unregister_device(sw->dev[i]);
 778  fail2: gameport_close(gameport);
 779  fail1: gameport_set_drvdata(gameport, NULL);
 780         kfree(sw);
 781         goto out;
 782 }
 783 
 784 static void sw_disconnect(struct gameport *gameport)
 785 {
 786         struct sw *sw = gameport_get_drvdata(gameport);
 787         int i;
 788 
 789         for (i = 0; i < sw->number; i++)
 790                 input_unregister_device(sw->dev[i]);
 791         gameport_close(gameport);
 792         gameport_set_drvdata(gameport, NULL);
 793         kfree(sw);
 794 }
 795 
 796 static struct gameport_driver sw_drv = {
 797         .driver         = {
 798                 .name   = "sidewinder",
 799                 .owner  = THIS_MODULE,
 800         },
 801         .description    = DRIVER_DESC,
 802         .connect        = sw_connect,
 803         .disconnect     = sw_disconnect,
 804 };
 805 
 806 module_gameport_driver(sw_drv);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/input/joystick/sidewinder.c

DEFINITIONS
