drivers/input/joystick/grip_mp.c

   1 /*
   2  * $Id: grip_mp.c,v 1.9 2002/07/20 19:28:45 bonnland Exp $
   3  *
   4  *  Driver for the Gravis Grip Multiport, a gamepad "hub" that
   5  *  connects up to four 9-pin digital gamepads/joysticks.
   6  *  Driver tested on SMP and UP kernel versions 2.4.18-4 and 2.4.18-5.
   7  *
   8  *  Thanks to Chris Gassib for helpful advice.
   9  *
  10  *  Copyright (c)      2002 Brian Bonnlander, Bill Soudan
  11  *  Copyright (c) 1998-2000 Vojtech Pavlik
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/slab.h>
  18 #include <linux/gameport.h>
  19 #include <linux/input.h>
  20 #include <linux/delay.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/jiffies.h>
  23
  24 #define DRIVER_DESC     "Gravis Grip Multiport driver"
  25
  26 MODULE_AUTHOR("Brian Bonnlander");
  27 MODULE_DESCRIPTION(DRIVER_DESC);
  28 MODULE_LICENSE("GPL");
  29
  30 #ifdef GRIP_DEBUG
  31 #define dbg(format, arg...) printk(KERN_ERR __FILE__ ": " format "\n" , ## arg)
  32 #else
  33 #define dbg(format, arg...) do {} while (0)
  34 #endif
  35
  36 #define GRIP_MAX_PORTS  4
  37 /*
  38  * Grip multiport state
  39  */
  40
  41 struct grip_port {
  42         struct input_dev *dev;
  43         int mode;
  44         int registered;
  45
  46         /* individual gamepad states */
  47         int buttons;
  48         int xaxes;
  49         int yaxes;
  50         int dirty;     /* has the state been updated? */
  51 };
  52
  53 struct grip_mp {
  54         struct gameport *gameport;
  55         struct grip_port *port[GRIP_MAX_PORTS];
  56         int reads;
  57         int bads;
  58 };
  59
  60 /*
  61  * Multiport packet interpretation
  62  */
  63
  64 #define PACKET_FULL          0x80000000       /* packet is full                        */
  65 #define PACKET_IO_FAST       0x40000000       /* 3 bits per gameport read              */
  66 #define PACKET_IO_SLOW       0x20000000       /* 1 bit per gameport read               */
  67 #define PACKET_MP_MORE       0x04000000       /* multiport wants to send more          */
  68 #define PACKET_MP_DONE       0x02000000       /* multiport done sending                */
  69
  70 /*
  71  * Packet status code interpretation
  72  */
  73
  74 #define IO_GOT_PACKET        0x0100           /* Got a packet                           */
  75 #define IO_MODE_FAST         0x0200           /* Used 3 data bits per gameport read     */
  76 #define IO_SLOT_CHANGE       0x0800           /* Multiport physical slot status changed */
  77 #define IO_DONE              0x1000           /* Multiport is done sending packets      */
  78 #define IO_RETRY             0x4000           /* Try again later to get packet          */
  79 #define IO_RESET             0x8000           /* Force multiport to resend all packets  */
  80
  81 /*
  82  * Gamepad configuration data.  Other 9-pin digital joystick devices
  83  * may work with the multiport, so this may not be an exhaustive list!
  84  * Commodore 64 joystick remains untested.
  85  */
  86
  87 #define GRIP_INIT_DELAY         2000          /*  2 ms */
  88
  89 #define GRIP_MODE_NONE          0
  90 #define GRIP_MODE_RESET         1
  91 #define GRIP_MODE_GP            2
  92 #define GRIP_MODE_C64           3
  93
  94 static const int grip_btn_gp[]  = { BTN_TR, BTN_TL, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, -1 };
  95 static const int grip_btn_c64[] = { BTN_JOYSTICK, -1 };
  96
  97 static const int grip_abs_gp[]  = { ABS_X, ABS_Y, -1 };
  98 static const int grip_abs_c64[] = { ABS_X, ABS_Y, -1 };
  99
 100 static const int *grip_abs[] = { NULL, NULL, grip_abs_gp, grip_abs_c64 };
 101 static const int *grip_btn[] = { NULL, NULL, grip_btn_gp, grip_btn_c64 };
 102
 103 static const char *grip_name[] = { NULL, NULL, "Gravis Grip Pad", "Commodore 64 Joystick" };
 104
 105 static const int init_seq[] = {
 106         1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1,
 107         1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
 108         1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1,
 109         0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1 };
 110
 111 /* Maps multiport directional values to X,Y axis values (each axis encoded in 3 bits) */
 112
 113 static const int axis_map[] = { 5, 9, 1, 5, 6, 10, 2, 6, 4, 8, 0, 4, 5, 9, 1, 5 };
 114
 115 static int register_slot(int i, struct grip_mp *grip);
 116
 117 /*
 118  * Returns whether an odd or even number of bits are on in pkt.
 119  */
 120
 121 static int bit_parity(u32 pkt)
 122 {
 123         int x = pkt ^ (pkt >> 16);
 124         x ^= x >> 8;
 125         x ^= x >> 4;
 126         x ^= x >> 2;
 127         x ^= x >> 1;
 128         return x & 1;
 129 }
 130
 131 /*
 132  * Poll gameport; return true if all bits set in 'onbits' are on and
 133  * all bits set in 'offbits' are off.
 134  */
 135
 136 static inline int poll_until(u8 onbits, u8 offbits, int u_sec, struct gameport* gp, u8 *data)
 137 {
 138         int i, nloops;
 139
 140         nloops = gameport_time(gp, u_sec);
 141         for (i = 0; i < nloops; i++) {
 142                 *data = gameport_read(gp);
 143                 if ((*data & onbits) == onbits &&
 144                     (~(*data) & offbits) == offbits)
 145                         return 1;
 146         }
 147         dbg("gameport timed out after %d microseconds.\n", u_sec);
 148         return 0;
 149 }
 150
 151 /*
 152  * Gets a 28-bit packet from the multiport.
 153  *
 154  * After getting a packet successfully, commands encoded by sendcode may
 155  * be sent to the multiport.
 156  *
 157  * The multiport clock value is reflected in gameport bit B4.
 158  *
 159  * Returns a packet status code indicating whether packet is valid, the transfer
 160  * mode, and any error conditions.
 161  *
 162  * sendflags:      current I/O status
 163  * sendcode:   data to send to the multiport if sendflags is nonzero
 164  */
 165
 166 static int mp_io(struct gameport* gameport, int sendflags, int sendcode, u32 *packet)
 167 {
 168         u8  raw_data;            /* raw data from gameport */
 169         u8  data_mask;           /* packet data bits from raw_data */
 170         u32 pkt;                 /* packet temporary storage */
 171         int bits_per_read;       /* num packet bits per gameport read */
 172         int portvals = 0;        /* used for port value sanity check */
 173         int i;
 174
 175         /* Gameport bits B0, B4, B5 should first be off, then B4 should come on. */
 176
 177         *packet = 0;
 178         raw_data = gameport_read(gameport);
 179         if (raw_data & 1)
 180                 return IO_RETRY;
 181
 182         for (i = 0; i < 64; i++) {
 183                 raw_data = gameport_read(gameport);
 184                 portvals |= 1 << ((raw_data >> 4) & 3); /* Demux B4, B5 */
 185         }
 186
 187         if (portvals == 1) {                            /* B4, B5 off */
 188                 raw_data = gameport_read(gameport);
 189                 portvals = raw_data & 0xf0;
 190
 191                 if (raw_data & 0x31)
 192                         return IO_RESET;
 193                 gameport_trigger(gameport);
 194
 195                 if (!poll_until(0x10, 0, 308, gameport, &raw_data))
 196                         return IO_RESET;
 197         } else
 198                 return IO_RETRY;
 199
 200         /* Determine packet transfer mode and prepare for packet construction. */
 201
 202         if (raw_data & 0x20) {                 /* 3 data bits/read */
 203                 portvals |= raw_data >> 4;     /* Compare B4-B7 before & after trigger */
 204
 205                 if (portvals != 0xb)
 206                         return 0;
 207                 data_mask = 7;
 208                 bits_per_read = 3;
 209                 pkt = (PACKET_FULL | PACKET_IO_FAST) >> 28;
 210         } else {                                 /* 1 data bit/read */
 211                 data_mask = 1;
 212                 bits_per_read = 1;
 213                 pkt = (PACKET_FULL | PACKET_IO_SLOW) >> 28;
 214         }
 215
 216         /* Construct a packet.  Final data bits must be zero. */
 217
 218         while (1) {
 219                 if (!poll_until(0, 0x10, 77, gameport, &raw_data))
 220                         return IO_RESET;
 221                 raw_data = (raw_data >> 5) & data_mask;
 222
 223                 if (pkt & PACKET_FULL)
 224                         break;
 225                 pkt = (pkt << bits_per_read) | raw_data;
 226
 227                 if (!poll_until(0x10, 0, 77, gameport, &raw_data))
 228                         return IO_RESET;
 229         }
 230
 231         if (raw_data)
 232                 return IO_RESET;
 233
 234         /* If 3 bits/read used, drop from 30 bits to 28. */
 235
 236         if (bits_per_read == 3) {
 237                 pkt = (pkt & 0xffff0000) | ((pkt << 1) & 0xffff);
 238                 pkt = (pkt >> 2) | 0xf0000000;
 239         }
 240
 241         if (bit_parity(pkt) == 1)
 242                 return IO_RESET;
 243
 244         /* Acknowledge packet receipt */
 245
 246         if (!poll_until(0x30, 0, 77, gameport, &raw_data))
 247                 return IO_RESET;
 248
 249         raw_data = gameport_read(gameport);
 250
 251         if (raw_data & 1)
 252                 return IO_RESET;
 253
 254         gameport_trigger(gameport);
 255
 256         if (!poll_until(0, 0x20, 77, gameport, &raw_data))
 257                 return IO_RESET;
 258
 259         /* Return if we just wanted the packet or multiport wants to send more */
 260
 261         *packet = pkt;
 262         if ((sendflags == 0) || ((sendflags & IO_RETRY) && !(pkt & PACKET_MP_DONE)))
 263                 return IO_GOT_PACKET;
 264
 265         if (pkt & PACKET_MP_MORE)
 266                 return IO_GOT_PACKET | IO_RETRY;
 267
 268         /* Multiport is done sending packets and is ready to receive data */
 269
 270         if (!poll_until(0x20, 0, 77, gameport, &raw_data))
 271                 return IO_GOT_PACKET | IO_RESET;
 272
 273         raw_data = gameport_read(gameport);
 274         if (raw_data & 1)
 275                 return IO_GOT_PACKET | IO_RESET;
 276
 277         /* Trigger gameport based on bits in sendcode */
 278
 279         gameport_trigger(gameport);
 280         do {
 281                 if (!poll_until(0x20, 0x10, 116, gameport, &raw_data))
 282                         return IO_GOT_PACKET | IO_RESET;
 283
 284                 if (!poll_until(0x30, 0, 193, gameport, &raw_data))
 285                         return IO_GOT_PACKET | IO_RESET;
 286
 287                 if (raw_data & 1)
 288                         return IO_GOT_PACKET | IO_RESET;
 289
 290                 if (sendcode & 1)
 291                         gameport_trigger(gameport);
 292
 293                 sendcode >>= 1;
 294         } while (sendcode);
 295
 296         return IO_GOT_PACKET | IO_MODE_FAST;
 297 }
 298
 299 /*
 300  * Disables and restores interrupts for mp_io(), which does the actual I/O.
 301  */
 302
 303 static int multiport_io(struct gameport* gameport, int sendflags, int sendcode, u32 *packet)
 304 {
 305         int status;
 306         unsigned long flags;
 307
 308         local_irq_save(flags);
 309         status = mp_io(gameport, sendflags, sendcode, packet);
 310         local_irq_restore(flags);
 311
 312         return status;
 313 }
 314
 315 /*
 316  * Puts multiport into digital mode.  Multiport LED turns green.
 317  *
 318  * Returns true if a valid digital packet was received, false otherwise.
 319  */
 320
 321 static int dig_mode_start(struct gameport *gameport, u32 *packet)
 322 {
 323         int i, seq_len = sizeof(init_seq)/sizeof(int);
 324         int flags, tries = 0, bads = 0;
 325
 326         for (i = 0; i < seq_len; i++) {     /* Send magic sequence */
 327                 if (init_seq[i])
 328                         gameport_trigger(gameport);
 329                 udelay(GRIP_INIT_DELAY);
 330         }
 331
 332         for (i = 0; i < 16; i++)            /* Wait for multiport to settle */
 333                 udelay(GRIP_INIT_DELAY);
 334
 335         while (tries < 64 && bads < 8) {    /* Reset multiport and try getting a packet */
 336
 337                 flags = multiport_io(gameport, IO_RESET, 0x27, packet);
 338
 339                 if (flags & IO_MODE_FAST)
 340                         return 1;
 341
 342                 if (flags & IO_RETRY)
 343                         tries++;
 344                 else
 345                         bads++;
 346         }
 347         return 0;
 348 }
 349
 350 /*
 351  * Packet structure: B0-B15   => gamepad state
 352  *                   B16-B20  => gamepad device type
 353  *                   B21-B24  => multiport slot index (1-4)
 354  *
 355  * Known device types: 0x1f (grip pad), 0x0 (no device).  Others may exist.
 356  *
 357  * Returns the packet status.
 358  */
 359
 360 static int get_and_decode_packet(struct grip_mp *grip, int flags)
 361 {
 362         struct grip_port *port;
 363         u32 packet;
 364         int joytype = 0;
 365         int slot;
 366
 367         /* Get a packet and check for validity */
 368
 369         flags &= IO_RESET | IO_RETRY;
 370         flags = multiport_io(grip->gameport, flags, 0, &packet);
 371         grip->reads++;
 372
 373         if (packet & PACKET_MP_DONE)
 374                 flags |= IO_DONE;
 375
 376         if (flags && !(flags & IO_GOT_PACKET)) {
 377                 grip->bads++;
 378                 return flags;
 379         }
 380
 381         /* Ignore non-gamepad packets, e.g. multiport hardware version */
 382
 383         slot = ((packet >> 21) & 0xf) - 1;
 384         if ((slot < 0) || (slot > 3))
 385                 return flags;
 386
 387         port = grip->port[slot];
 388
 389         /*
 390          * Handle "reset" packets, which occur at startup, and when gamepads
 391          * are removed or plugged in.  May contain configuration of a new gamepad.
 392          */
 393
 394         joytype = (packet >> 16) & 0x1f;
 395         if (!joytype) {
 396
 397                 if (port->registered) {
 398                         printk(KERN_INFO "grip_mp: removing %s, slot %d\n",
 399                                grip_name[port->mode], slot);
 400                         input_unregister_device(port->dev);
 401                         port->registered = 0;
 402                 }
 403                 dbg("Reset: grip multiport slot %d\n", slot);
 404                 port->mode = GRIP_MODE_RESET;
 405                 flags |= IO_SLOT_CHANGE;
 406                 return flags;
 407         }
 408
 409         /* Interpret a grip pad packet */
 410
 411         if (joytype == 0x1f) {
 412
 413                 int dir = (packet >> 8) & 0xf;          /* eight way directional value */
 414                 port->buttons = (~packet) & 0xff;
 415                 port->yaxes = ((axis_map[dir] >> 2) & 3) - 1;
 416                 port->xaxes = (axis_map[dir] & 3) - 1;
 417                 port->dirty = 1;
 418
 419                 if (port->mode == GRIP_MODE_RESET)
 420                         flags |= IO_SLOT_CHANGE;
 421
 422                 port->mode = GRIP_MODE_GP;
 423
 424                 if (!port->registered) {
 425                         dbg("New Grip pad in multiport slot %d.\n", slot);
 426                         register_slot(slot, grip);
 427                 }
 428                 return flags;
 429         }
 430
 431         /* Handle non-grip device codes.  For now, just print diagnostics. */
 432
 433         {
 434                 static int strange_code = 0;
 435                 if (strange_code != joytype) {
 436                         printk(KERN_INFO "Possible non-grip pad/joystick detected.\n");
 437                         printk(KERN_INFO "Got joy type 0x%x and packet 0x%x.\n", joytype, packet);
 438                         strange_code = joytype;
 439                 }
 440         }
 441         return flags;
 442 }
 443
 444 /*
 445  * Returns true if all multiport slot states appear valid.
 446  */
 447
 448 static int slots_valid(struct grip_mp *grip)
 449 {
 450         int flags, slot, invalid = 0, active = 0;
 451
 452         flags = get_and_decode_packet(grip, 0);
 453         if (!(flags & IO_GOT_PACKET))
 454                 return 0;
 455
 456         for (slot = 0; slot < 4; slot++) {
 457                 if (grip->port[slot]->mode == GRIP_MODE_RESET)
 458                         invalid = 1;
 459                 if (grip->port[slot]->mode != GRIP_MODE_NONE)
 460                         active = 1;
 461         }
 462
 463         /* Return true if no active slot but multiport sent all its data */
 464         if (!active)
 465                 return (flags & IO_DONE) ? 1 : 0;
 466
 467         /* Return false if invalid device code received */
 468         return invalid ? 0 : 1;
 469 }
 470
 471 /*
 472  * Returns whether the multiport was placed into digital mode and
 473  * able to communicate its state successfully.
 474  */
 475
 476 static int multiport_init(struct grip_mp *grip)
 477 {
 478         int dig_mode, initialized = 0, tries = 0;
 479         u32 packet;
 480
 481         dig_mode = dig_mode_start(grip->gameport, &packet);
 482         while (!dig_mode && tries < 4) {
 483                 dig_mode = dig_mode_start(grip->gameport, &packet);
 484                 tries++;
 485         }
 486
 487         if (dig_mode)
 488                 dbg("multiport_init(): digital mode activated.\n");
 489         else {
 490                 dbg("multiport_init(): unable to activate digital mode.\n");
 491                 return 0;
 492         }
 493
 494         /* Get packets, store multiport state, and check state's validity */
 495         for (tries = 0; tries < 4096; tries++) {
 496                 if (slots_valid(grip)) {
 497                         initialized = 1;
 498                         break;
 499                 }
 500         }
 501         dbg("multiport_init(): initialized == %d\n", initialized);
 502         return initialized;
 503 }
 504
 505 /*
 506  * Reports joystick state to the linux input layer.
 507  */
 508
 509 static void report_slot(struct grip_mp *grip, int slot)
 510 {
 511         struct grip_port *port = grip->port[slot];
 512         int i;
 513
 514         /* Store button states with linux input driver */
 515
 516         for (i = 0; i < 8; i++)
 517                 input_report_key(port->dev, grip_btn_gp[i], (port->buttons >> i) & 1);
 518
 519         /* Store axis states with linux driver */
 520
 521         input_report_abs(port->dev, ABS_X, port->xaxes);
 522         input_report_abs(port->dev, ABS_Y, port->yaxes);
 523
 524         /* Tell the receiver of the events to process them */
 525
 526         input_sync(port->dev);
 527
 528         port->dirty = 0;
 529 }
 530
 531 /*
 532  * Get the multiport state.
 533  */
 534
 535 static void grip_poll(struct gameport *gameport)
 536 {
 537         struct grip_mp *grip = gameport_get_drvdata(gameport);
 538         int i, npkts, flags;
 539
 540         for (npkts = 0; npkts < 4; npkts++) {
 541                 flags = IO_RETRY;
 542                 for (i = 0; i < 32; i++) {
 543                         flags = get_and_decode_packet(grip, flags);
 544                         if ((flags & IO_GOT_PACKET) || !(flags & IO_RETRY))
 545                                 break;
 546                 }
 547                 if (flags & IO_DONE)
 548                         break;
 549         }
 550
 551         for (i = 0; i < 4; i++)
 552                 if (grip->port[i]->dirty)
 553                         report_slot(grip, i);
 554 }
 555
 556 /*
 557  * Called when a joystick device file is opened
 558  */
 559
 560 static int grip_open(struct input_dev *dev)
 561 {
 562         struct grip_mp *grip = dev->private;
 563
 564         gameport_start_polling(grip->gameport);
 565         return 0;
 566 }
 567
 568 /*
 569  * Called when a joystick device file is closed
 570  */
 571
 572 static void grip_close(struct input_dev *dev)
 573 {
 574         struct grip_mp *grip = dev->private;
 575
 576         gameport_start_polling(grip->gameport);
 577 }
 578
 579 /*
 580  * Tell the linux input layer about a newly plugged-in gamepad.
 581  */
 582
 583 static int register_slot(int slot, struct grip_mp *grip)
 584 {
 585         struct grip_port *port = grip->port[slot];
 586         struct input_dev *input_dev;
 587         int j, t;
 588
 589         port->dev = input_dev = input_allocate_device();
 590         if (!input_dev)
 591                 return -ENOMEM;
 592
 593         input_dev->name = grip_name[port->mode];
 594         input_dev->id.bustype = BUS_GAMEPORT;
 595         input_dev->id.vendor = GAMEPORT_ID_VENDOR_GRAVIS;
 596         input_dev->id.product = 0x0100 + port->mode;
 597         input_dev->id.version = 0x0100;
 598         input_dev->cdev.dev = &grip->gameport->dev;
 599         input_dev->private = grip;
 600
 601         input_dev->open = grip_open;
 602         input_dev->close = grip_close;
 603
 604         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 605
 606         for (j = 0; (t = grip_abs[port->mode][j]) >= 0; j++)
 607                 input_set_abs_params(input_dev, t, -1, 1, 0, 0);
 608
 609         for (j = 0; (t = grip_btn[port->mode][j]) >= 0; j++)
 610                 if (t > 0)
 611                         set_bit(t, input_dev->keybit);
 612
 613         input_register_device(port->dev);
 614         port->registered = 1;
 615
 616         if (port->dirty)                    /* report initial state, if any */
 617                 report_slot(grip, slot);
 618
 619         return 0;
 620 }
 621
 622 static int grip_connect(struct gameport *gameport, struct gameport_driver *drv)
 623 {
 624         struct grip_mp *grip;
 625         int err;
 626
 627         if (!(grip = kzalloc(sizeof(struct grip_mp), GFP_KERNEL)))
 628                 return -ENOMEM;
 629
 630         grip->gameport = gameport;
 631
 632         gameport_set_drvdata(gameport, grip);
 633
 634         err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
 635         if (err)
 636                 goto fail1;
 637
 638         gameport_set_poll_handler(gameport, grip_poll);
 639         gameport_set_poll_interval(gameport, 20);
 640
 641         if (!multiport_init(grip)) {
 642                 err = -ENODEV;
 643                 goto fail2;
 644         }
 645
 646         if (!grip->port[0]->mode && !grip->port[1]->mode && !grip->port[2]->mode && !grip->port[3]->mode) {
 647                 /* nothing plugged in */
 648                 err = -ENODEV;
 649                 goto fail2;
 650         }
 651
 652         return 0;
 653
 654 fail2:  gameport_close(gameport);
 655 fail1:  gameport_set_drvdata(gameport, NULL);
 656         kfree(grip);
 657         return err;
 658 }
 659
 660 static void grip_disconnect(struct gameport *gameport)
 661 {
 662         struct grip_mp *grip = gameport_get_drvdata(gameport);
 663         int i;
 664
 665         for (i = 0; i < 4; i++)
 666                 if (grip->port[i]->registered)
 667                         input_unregister_device(grip->port[i]->dev);
 668         gameport_close(gameport);
 669         gameport_set_drvdata(gameport, NULL);
 670         kfree(grip);
 671 }
 672
 673 static struct gameport_driver grip_drv = {
 674         .driver         = {
 675                 .name   = "grip_mp",
 676         },
 677         .description    = DRIVER_DESC,
 678         .connect        = grip_connect,
 679         .disconnect     = grip_disconnect,
 680 };
 681
 682 static int __init grip_init(void)
 683 {
 684         gameport_register_driver(&grip_drv);
 685         return 0;
 686 }
 687
 688 static void __exit grip_exit(void)
 689 {
 690         gameport_unregister_driver(&grip_drv);
 691 }
 692
 693 module_init(grip_init);
 694 module_exit(grip_exit);