drivers/input/joystick/grip.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) 1998-2001 Vojtech Pavlik
   4  */
   5
   6 /*
   7  * Gravis/Kensington GrIP protocol joystick and gamepad driver for Linux
   8  */
   9
  10 /*
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/gameport.h>
  17 #include <linux/input.h>
  18 #include <linux/jiffies.h>
  19
  20 #define DRIVER_DESC     "Gravis GrIP protocol joystick driver"
  21
  22 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  23 MODULE_DESCRIPTION(DRIVER_DESC);
  24 MODULE_LICENSE("GPL");
  25
  26 #define GRIP_MODE_GPP           1
  27 #define GRIP_MODE_BD            2
  28 #define GRIP_MODE_XT            3
  29 #define GRIP_MODE_DC            4
  30
  31 #define GRIP_LENGTH_GPP         24
  32 #define GRIP_STROBE_GPP         200     /* 200 us */
  33 #define GRIP_LENGTH_XT          4
  34 #define GRIP_STROBE_XT          64      /* 64 us */
  35 #define GRIP_MAX_CHUNKS_XT      10
  36 #define GRIP_MAX_BITS_XT        30
  37
  38 struct grip {
  39         struct gameport *gameport;
  40         struct input_dev *dev[2];
  41         unsigned char mode[2];
  42         int reads;
  43         int bads;
  44         char phys[2][32];
  45 };
  46
  47 static int grip_btn_gpp[] = { BTN_START, BTN_SELECT, BTN_TR2, BTN_Y, 0, BTN_TL2, BTN_A, BTN_B, BTN_X, 0, BTN_TL, BTN_TR, -1 };
  48 static int grip_btn_bd[] = { BTN_THUMB, BTN_THUMB2, BTN_TRIGGER, BTN_TOP, BTN_BASE, -1 };
  49 static int grip_btn_xt[] = { BTN_TRIGGER, BTN_THUMB, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_SELECT, BTN_START, BTN_MODE, -1 };
  50 static int grip_btn_dc[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_BASE5, -1 };
  51
  52 static int grip_abs_gpp[] = { ABS_X, ABS_Y, -1 };
  53 static int grip_abs_bd[] = { ABS_X, ABS_Y, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };
  54 static int grip_abs_xt[] = { ABS_X, ABS_Y, ABS_BRAKE, ABS_GAS, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, -1 };
  55 static int grip_abs_dc[] = { ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };
  56
  57 static char *grip_name[] = { NULL, "Gravis GamePad Pro", "Gravis Blackhawk Digital",
  58                                 "Gravis Xterminator Digital", "Gravis Xterminator DualControl" };
  59 static int *grip_abs[] = { NULL, grip_abs_gpp, grip_abs_bd, grip_abs_xt, grip_abs_dc };
  60 static int *grip_btn[] = { NULL, grip_btn_gpp, grip_btn_bd, grip_btn_xt, grip_btn_dc };
  61 static char grip_anx[] = { 0, 0, 3, 5, 5 };
  62 static char grip_cen[] = { 0, 0, 2, 2, 4 };
  63
  64 /*
  65  * grip_gpp_read_packet() reads a Gravis GamePad Pro packet.
  66  */
  67
  68 static int grip_gpp_read_packet(struct gameport *gameport, int shift, unsigned int *data)
  69 {
  70         unsigned long flags;
  71         unsigned char u, v;
  72         unsigned int t;
  73         int i;
  74
  75         int strobe = gameport_time(gameport, GRIP_STROBE_GPP);
  76
  77         data[0] = 0;
  78         t = strobe;
  79         i = 0;
  80
  81         local_irq_save(flags);
  82
  83         v = gameport_read(gameport) >> shift;
  84
  85         do {
  86                 t--;
  87                 u = v; v = (gameport_read(gameport) >> shift) & 3;
  88                 if (~v & u & 1) {
  89                         data[0] |= (v >> 1) << i++;
  90                         t = strobe;
  91                 }
  92         } while (i < GRIP_LENGTH_GPP && t > 0);
  93
  94         local_irq_restore(flags);
  95
  96         if (i < GRIP_LENGTH_GPP) return -1;
  97
  98         for (i = 0; i < GRIP_LENGTH_GPP && (data[0] & 0xfe4210) ^ 0x7c0000; i++)
  99                 data[0] = data[0] >> 1 | (data[0] & 1) << (GRIP_LENGTH_GPP - 1);
 100
 101         return -(i == GRIP_LENGTH_GPP);
 102 }
 103
 104 /*
 105  * grip_xt_read_packet() reads a Gravis Xterminator packet.
 106  */
 107
 108 static int grip_xt_read_packet(struct gameport *gameport, int shift, unsigned int *data)
 109 {
 110         unsigned int i, j, buf, crc;
 111         unsigned char u, v, w;
 112         unsigned long flags;
 113         unsigned int t;
 114         char status;
 115
 116         int strobe = gameport_time(gameport, GRIP_STROBE_XT);
 117
 118         data[0] = data[1] = data[2] = data[3] = 0;
 119         status = buf = i = j = 0;
 120         t = strobe;
 121
 122         local_irq_save(flags);
 123
 124         v = w = (gameport_read(gameport) >> shift) & 3;
 125
 126         do {
 127                 t--;
 128                 u = (gameport_read(gameport) >> shift) & 3;
 129
 130                 if (u ^ v) {
 131
 132                         if ((u ^ v) & 1) {
 133                                 buf = (buf << 1) | (u >> 1);
 134                                 t = strobe;
 135                                 i++;
 136                         } else
 137
 138                         if ((((u ^ v) & (v ^ w)) >> 1) & ~(u | v | w) & 1) {
 139                                 if (i == 20) {
 140                                         crc = buf ^ (buf >> 7) ^ (buf >> 14);
 141                                         if (!((crc ^ (0x25cb9e70 >> ((crc >> 2) & 0x1c))) & 0xf)) {
 142                                                 data[buf >> 18] = buf >> 4;
 143                                                 status |= 1 << (buf >> 18);
 144                                         }
 145                                         j++;
 146                                 }
 147                                 t = strobe;
 148                                 buf = 0;
 149                                 i = 0;
 150                         }
 151                         w = v;
 152                         v = u;
 153                 }
 154
 155         } while (status != 0xf && i < GRIP_MAX_BITS_XT && j < GRIP_MAX_CHUNKS_XT && t > 0);
 156
 157         local_irq_restore(flags);
 158
 159         return -(status != 0xf);
 160 }
 161
 162 /*
 163  * grip_timer() repeatedly polls the joysticks and generates events.
 164  */
 165
 166 static void grip_poll(struct gameport *gameport)
 167 {
 168         struct grip *grip = gameport_get_drvdata(gameport);
 169         unsigned int data[GRIP_LENGTH_XT];
 170         struct input_dev *dev;
 171         int i, j;
 172
 173         for (i = 0; i < 2; i++) {
 174
 175                 dev = grip->dev[i];
 176                 if (!dev)
 177                         continue;
 178
 179                 grip->reads++;
 180
 181                 switch (grip->mode[i]) {
 182
 183                         case GRIP_MODE_GPP:
 184
 185                                 if (grip_gpp_read_packet(grip->gameport, (i << 1) + 4, data)) {
 186                                         grip->bads++;
 187                                         break;
 188                                 }
 189
 190                                 input_report_abs(dev, ABS_X, ((*data >> 15) & 1) - ((*data >> 16) & 1));
 191                                 input_report_abs(dev, ABS_Y, ((*data >> 13) & 1) - ((*data >> 12) & 1));
 192
 193                                 for (j = 0; j < 12; j++)
 194                                         if (grip_btn_gpp[j])
 195                                                 input_report_key(dev, grip_btn_gpp[j], (*data >> j) & 1);
 196
 197                                 break;
 198
 199                         case GRIP_MODE_BD:
 200
 201                                 if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) {
 202                                         grip->bads++;
 203                                         break;
 204                                 }
 205
 206                                 input_report_abs(dev, ABS_X,        (data[0] >> 2) & 0x3f);
 207                                 input_report_abs(dev, ABS_Y,  63 - ((data[0] >> 8) & 0x3f));
 208                                 input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f);
 209
 210                                 input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2]       & 1));
 211                                 input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1));
 212
 213                                 for (j = 0; j < 5; j++)
 214                                         input_report_key(dev, grip_btn_bd[j], (data[3] >> (j + 4)) & 1);
 215
 216                                 break;
 217
 218                         case GRIP_MODE_XT:
 219
 220                                 if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) {
 221                                         grip->bads++;
 222                                         break;
 223                                 }
 224
 225                                 input_report_abs(dev, ABS_X,        (data[0] >> 2) & 0x3f);
 226                                 input_report_abs(dev, ABS_Y,  63 - ((data[0] >> 8) & 0x3f));
 227                                 input_report_abs(dev, ABS_BRAKE,    (data[1] >> 2) & 0x3f);
 228                                 input_report_abs(dev, ABS_GAS,      (data[1] >> 8) & 0x3f);
 229                                 input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f);
 230
 231                                 input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2]       & 1));
 232                                 input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1));
 233                                 input_report_abs(dev, ABS_HAT1X, ((data[2] >> 5) & 1) - ((data[2] >> 4) & 1));
 234                                 input_report_abs(dev, ABS_HAT1Y, ((data[2] >> 6) & 1) - ((data[2] >> 7) & 1));
 235
 236                                 for (j = 0; j < 11; j++)
 237                                         input_report_key(dev, grip_btn_xt[j], (data[3] >> (j + 3)) & 1);
 238                                 break;
 239
 240                         case GRIP_MODE_DC:
 241
 242                                 if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) {
 243                                         grip->bads++;
 244                                         break;
 245                                 }
 246
 247                                 input_report_abs(dev, ABS_X,        (data[0] >> 2) & 0x3f);
 248                                 input_report_abs(dev, ABS_Y,        (data[0] >> 8) & 0x3f);
 249                                 input_report_abs(dev, ABS_RX,       (data[1] >> 2) & 0x3f);
 250                                 input_report_abs(dev, ABS_RY,       (data[1] >> 8) & 0x3f);
 251                                 input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f);
 252
 253                                 input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2]       & 1));
 254                                 input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1));
 255
 256                                 for (j = 0; j < 9; j++)
 257                                         input_report_key(dev, grip_btn_dc[j], (data[3] >> (j + 3)) & 1);
 258                                 break;
 259
 260
 261                 }
 262
 263                 input_sync(dev);
 264         }
 265 }
 266
 267 static int grip_open(struct input_dev *dev)
 268 {
 269         struct grip *grip = input_get_drvdata(dev);
 270
 271         gameport_start_polling(grip->gameport);
 272         return 0;
 273 }
 274
 275 static void grip_close(struct input_dev *dev)
 276 {
 277         struct grip *grip = input_get_drvdata(dev);
 278
 279         gameport_stop_polling(grip->gameport);
 280 }
 281
 282 static int grip_connect(struct gameport *gameport, struct gameport_driver *drv)
 283 {
 284         struct grip *grip;
 285         struct input_dev *input_dev;
 286         unsigned int data[GRIP_LENGTH_XT];
 287         int i, j, t;
 288         int err;
 289
 290         if (!(grip = kzalloc(sizeof(struct grip), GFP_KERNEL)))
 291                 return -ENOMEM;
 292
 293         grip->gameport = gameport;
 294
 295         gameport_set_drvdata(gameport, grip);
 296
 297         err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
 298         if (err)
 299                 goto fail1;
 300
 301         for (i = 0; i < 2; i++) {
 302                 if (!grip_gpp_read_packet(gameport, (i << 1) + 4, data)) {
 303                         grip->mode[i] = GRIP_MODE_GPP;
 304                         continue;
 305                 }
 306                 if (!grip_xt_read_packet(gameport, (i << 1) + 4, data)) {
 307                         if (!(data[3] & 7)) {
 308                                 grip->mode[i] = GRIP_MODE_BD;
 309                                 continue;
 310                         }
 311                         if (!(data[2] & 0xf0)) {
 312                                 grip->mode[i] = GRIP_MODE_XT;
 313                                 continue;
 314                         }
 315                         grip->mode[i] = GRIP_MODE_DC;
 316                         continue;
 317                 }
 318         }
 319
 320         if (!grip->mode[0] && !grip->mode[1]) {
 321                 err = -ENODEV;
 322                 goto fail2;
 323         }
 324
 325         gameport_set_poll_handler(gameport, grip_poll);
 326         gameport_set_poll_interval(gameport, 20);
 327
 328         for (i = 0; i < 2; i++) {
 329                 if (!grip->mode[i])
 330                         continue;
 331
 332                 grip->dev[i] = input_dev = input_allocate_device();
 333                 if (!input_dev) {
 334                         err = -ENOMEM;
 335                         goto fail3;
 336                 }
 337
 338                 snprintf(grip->phys[i], sizeof(grip->phys[i]),
 339                          "%s/input%d", gameport->phys, i);
 340
 341                 input_dev->name = grip_name[grip->mode[i]];
 342                 input_dev->phys = grip->phys[i];
 343                 input_dev->id.bustype = BUS_GAMEPORT;
 344                 input_dev->id.vendor = GAMEPORT_ID_VENDOR_GRAVIS;
 345                 input_dev->id.product = grip->mode[i];
 346                 input_dev->id.version = 0x0100;
 347                 input_dev->dev.parent = &gameport->dev;
 348
 349                 input_set_drvdata(input_dev, grip);
 350
 351                 input_dev->open = grip_open;
 352                 input_dev->close = grip_close;
 353
 354                 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 355
 356                 for (j = 0; (t = grip_abs[grip->mode[i]][j]) >= 0; j++) {
 357
 358                         if (j < grip_cen[grip->mode[i]])
 359                                 input_set_abs_params(input_dev, t, 14, 52, 1, 2);
 360                         else if (j < grip_anx[grip->mode[i]])
 361                                 input_set_abs_params(input_dev, t, 3, 57, 1, 0);
 362                         else
 363                                 input_set_abs_params(input_dev, t, -1, 1, 0, 0);
 364                 }
 365
 366                 for (j = 0; (t = grip_btn[grip->mode[i]][j]) >= 0; j++)
 367                         if (t > 0)
 368                                 set_bit(t, input_dev->keybit);
 369
 370                 err = input_register_device(grip->dev[i]);
 371                 if (err)
 372                         goto fail4;
 373         }
 374
 375         return 0;
 376
 377  fail4: input_free_device(grip->dev[i]);
 378  fail3: while (--i >= 0)
 379                 if (grip->dev[i])
 380                         input_unregister_device(grip->dev[i]);
 381  fail2: gameport_close(gameport);
 382  fail1: gameport_set_drvdata(gameport, NULL);
 383         kfree(grip);
 384         return err;
 385 }
 386
 387 static void grip_disconnect(struct gameport *gameport)
 388 {
 389         struct grip *grip = gameport_get_drvdata(gameport);
 390         int i;
 391
 392         for (i = 0; i < 2; i++)
 393                 if (grip->dev[i])
 394                         input_unregister_device(grip->dev[i]);
 395         gameport_close(gameport);
 396         gameport_set_drvdata(gameport, NULL);
 397         kfree(grip);
 398 }
 399
 400 static struct gameport_driver grip_drv = {
 401         .driver         = {
 402                 .name   = "grip",
 403                 .owner  = THIS_MODULE,
 404         },
 405         .description    = DRIVER_DESC,
 406         .connect        = grip_connect,
 407         .disconnect     = grip_disconnect,
 408 };
 409
 410 module_gameport_driver(grip_drv);