linux/drivers/input/joystick/sidewinder.c
<<
>>
Prefs
   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 <vojtech@ucw.cz>, 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
  40MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  41MODULE_DESCRIPTION(DRIVER_DESC);
  42MODULE_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
  83static char *sw_name[] = {      "3D Pro", "GamePad", "Precision Pro", "Force Feedback Pro", "FreeStyle Pro",
  84                                "Force Feedback Wheel" };
  85
  86static 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
  94static 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
 102static 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
 110static 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
 115struct 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
 136static 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
 218static __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
 241static 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
 266static 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
 282static 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
 302static 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
 426static 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
 501static 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
 510static 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
 518static 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
 529static 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
 544static 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
 572static 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
 587static 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 <vojtech@ucw.cz>\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
 801static 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
 813static 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
 823module_gameport_driver(sw_drv);
 824