drivers/input/joystick/analog.c

   1 /*
   2  *  Copyright (c) 1996-2001 Vojtech Pavlik
   3  */
   4
   5 /*
   6  * Analog joystick and gamepad 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
  25 #include <linux/delay.h>
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/slab.h>
  29 #include <linux/bitops.h>
  30 #include <linux/init.h>
  31 #include <linux/input.h>
  32 #include <linux/gameport.h>
  33 #include <linux/jiffies.h>
  34 #include <linux/timex.h>
  35 #include <linux/timekeeping.h>
  36
  37 #define DRIVER_DESC     "Analog joystick and gamepad driver"
  38
  39 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  40 MODULE_DESCRIPTION(DRIVER_DESC);
  41 MODULE_LICENSE("GPL");
  42
  43 static bool use_ktime = true;
  44 module_param(use_ktime, bool, 0400);
  45 MODULE_PARM_DESC(use_ktime, "Use ktime for measuring I/O speed");
  46
  47 /*
  48  * Option parsing.
  49  */
  50
  51 #define ANALOG_PORTS            16
  52
  53 static char *js[ANALOG_PORTS];
  54 static unsigned int js_nargs;
  55 static int analog_options[ANALOG_PORTS];
  56 module_param_array_named(map, js, charp, &js_nargs, 0);
  57 MODULE_PARM_DESC(map, "Describes analog joysticks type/capabilities");
  58
  59 /*
  60  * Times, feature definitions.
  61  */
  62
  63 #define ANALOG_RUDDER           0x00004
  64 #define ANALOG_THROTTLE         0x00008
  65 #define ANALOG_AXES_STD         0x0000f
  66 #define ANALOG_BTNS_STD         0x000f0
  67
  68 #define ANALOG_BTNS_CHF         0x00100
  69 #define ANALOG_HAT1_CHF         0x00200
  70 #define ANALOG_HAT2_CHF         0x00400
  71 #define ANALOG_HAT_FCS          0x00800
  72 #define ANALOG_HATS_ALL         0x00e00
  73 #define ANALOG_BTN_TL           0x01000
  74 #define ANALOG_BTN_TR           0x02000
  75 #define ANALOG_BTN_TL2          0x04000
  76 #define ANALOG_BTN_TR2          0x08000
  77 #define ANALOG_BTNS_TLR         0x03000
  78 #define ANALOG_BTNS_TLR2        0x0c000
  79 #define ANALOG_BTNS_GAMEPAD     0x0f000
  80
  81 #define ANALOG_HBTN_CHF         0x10000
  82 #define ANALOG_ANY_CHF          0x10700
  83 #define ANALOG_SAITEK           0x20000
  84 #define ANALOG_EXTENSIONS       0x7ff00
  85 #define ANALOG_GAMEPAD          0x80000
  86
  87 #define ANALOG_MAX_TIME         3       /* 3 ms */
  88 #define ANALOG_LOOP_TIME        2000    /* 2 * loop */
  89 #define ANALOG_SAITEK_DELAY     200     /* 200 us */
  90 #define ANALOG_SAITEK_TIME      2000    /* 2000 us */
  91 #define ANALOG_AXIS_TIME        2       /* 2 * refresh */
  92 #define ANALOG_INIT_RETRIES     8       /* 8 times */
  93 #define ANALOG_FUZZ_BITS        2       /* 2 bit more */
  94 #define ANALOG_FUZZ_MAGIC       36      /* 36 u*ms/loop */
  95
  96 #define ANALOG_MAX_NAME_LENGTH  128
  97 #define ANALOG_MAX_PHYS_LENGTH  32
  98
  99 static short analog_axes[] = { ABS_X, ABS_Y, ABS_RUDDER, ABS_THROTTLE };
 100 static short analog_hats[] = { ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, ABS_HAT2X, ABS_HAT2Y };
 101 static short analog_pads[] = { BTN_Y, BTN_Z, BTN_TL, BTN_TR };
 102 static short analog_exts[] = { ANALOG_HAT1_CHF, ANALOG_HAT2_CHF, ANALOG_HAT_FCS };
 103 static short analog_pad_btn[] = { BTN_A, BTN_B, BTN_C, BTN_X, BTN_TL2, BTN_TR2, BTN_SELECT, BTN_START, BTN_MODE, BTN_BASE };
 104 static short analog_joy_btn[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2,
 105                                   BTN_BASE3, BTN_BASE4, BTN_BASE5, BTN_BASE6 };
 106
 107 static unsigned char analog_chf[] = { 0xf, 0x0, 0x1, 0x9, 0x2, 0x4, 0xc, 0x8, 0x3, 0x5, 0xb, 0x7, 0xd, 0xe, 0xa, 0x6 };
 108
 109 struct analog {
 110         struct input_dev *dev;
 111         int mask;
 112         short *buttons;
 113         char name[ANALOG_MAX_NAME_LENGTH];
 114         char phys[ANALOG_MAX_PHYS_LENGTH];
 115 };
 116
 117 struct analog_port {
 118         struct gameport *gameport;
 119         struct analog analog[2];
 120         unsigned char mask;
 121         char saitek;
 122         char cooked;
 123         int bads;
 124         int reads;
 125         int speed;
 126         int loop;
 127         int fuzz;
 128         int axes[4];
 129         int buttons;
 130         int initial[4];
 131         int axtime;
 132 };
 133
 134 /*
 135  * Time macros.
 136  */
 137
 138 #ifdef __i386__
 139
 140 #include <linux/i8253.h>
 141
 142 #define GET_TIME(x)     do { if (boot_cpu_has(X86_FEATURE_TSC)) x = (unsigned int)rdtsc(); else x = get_time_pit(); } while (0)
 143 #define DELTA(x,y)      (boot_cpu_has(X86_FEATURE_TSC) ? ((y) - (x)) : ((x) - (y) + ((x) < (y) ? PIT_TICK_RATE / HZ : 0)))
 144 #define TIME_NAME       (boot_cpu_has(X86_FEATURE_TSC)?"TSC":"PIT")
 145 static unsigned int get_time_pit(void)
 146 {
 147         unsigned long flags;
 148         unsigned int count;
 149
 150         raw_spin_lock_irqsave(&i8253_lock, flags);
 151         outb_p(0x00, 0x43);
 152         count = inb_p(0x40);
 153         count |= inb_p(0x40) << 8;
 154         raw_spin_unlock_irqrestore(&i8253_lock, flags);
 155
 156         return count;
 157 }
 158 #elif defined(__x86_64__)
 159 #define GET_TIME(x)     do { x = (unsigned int)rdtsc(); } while (0)
 160 #define DELTA(x,y)      ((y)-(x))
 161 #define TIME_NAME       "TSC"
 162 #elif defined(__alpha__) || defined(CONFIG_ARM) || defined(CONFIG_ARM64) || defined(CONFIG_PPC) || defined(CONFIG_RISCV)
 163 #define GET_TIME(x)     do { x = get_cycles(); } while (0)
 164 #define DELTA(x,y)      ((y)-(x))
 165 #define TIME_NAME       "get_cycles"
 166 #else
 167 #define FAKE_TIME
 168 static unsigned long analog_faketime = 0;
 169 #define GET_TIME(x)     do { x = analog_faketime++; } while(0)
 170 #define DELTA(x,y)      ((y)-(x))
 171 #define TIME_NAME       "Unreliable"
 172 #warning Precise timer not defined for this architecture.
 173 #endif
 174
 175 static inline u64 get_time(void)
 176 {
 177         if (use_ktime) {
 178                 return ktime_get_ns();
 179         } else {
 180                 unsigned int x;
 181                 GET_TIME(x);
 182                 return x;
 183         }
 184 }
 185
 186 static inline unsigned int delta(u64 x, u64 y)
 187 {
 188         if (use_ktime)
 189                 return y - x;
 190         else
 191                 return DELTA((unsigned int)x, (unsigned int)y);
 192 }
 193
 194 /*
 195  * analog_decode() decodes analog joystick data and reports input events.
 196  */
 197
 198 static void analog_decode(struct analog *analog, int *axes, int *initial, int buttons)
 199 {
 200         struct input_dev *dev = analog->dev;
 201         int i, j;
 202
 203         if (analog->mask & ANALOG_HAT_FCS)
 204                 for (i = 0; i < 4; i++)
 205                         if (axes[3] < ((initial[3] * ((i << 1) + 1)) >> 3)) {
 206                                 buttons |= 1 << (i + 14);
 207                                 break;
 208                         }
 209
 210         for (i = j = 0; i < 6; i++)
 211                 if (analog->mask & (0x10 << i))
 212                         input_report_key(dev, analog->buttons[j++], (buttons >> i) & 1);
 213
 214         if (analog->mask & ANALOG_HBTN_CHF)
 215                 for (i = 0; i < 4; i++)
 216                         input_report_key(dev, analog->buttons[j++], (buttons >> (i + 10)) & 1);
 217
 218         if (analog->mask & ANALOG_BTN_TL)
 219                 input_report_key(dev, analog_pads[0], axes[2] < (initial[2] >> 1));
 220         if (analog->mask & ANALOG_BTN_TR)
 221                 input_report_key(dev, analog_pads[1], axes[3] < (initial[3] >> 1));
 222         if (analog->mask & ANALOG_BTN_TL2)
 223                 input_report_key(dev, analog_pads[2], axes[2] > (initial[2] + (initial[2] >> 1)));
 224         if (analog->mask & ANALOG_BTN_TR2)
 225                 input_report_key(dev, analog_pads[3], axes[3] > (initial[3] + (initial[3] >> 1)));
 226
 227         for (i = j = 0; i < 4; i++)
 228                 if (analog->mask & (1 << i))
 229                         input_report_abs(dev, analog_axes[j++], axes[i]);
 230
 231         for (i = j = 0; i < 3; i++)
 232                 if (analog->mask & analog_exts[i]) {
 233                         input_report_abs(dev, analog_hats[j++],
 234                                 ((buttons >> ((i << 2) + 7)) & 1) - ((buttons >> ((i << 2) + 9)) & 1));
 235                         input_report_abs(dev, analog_hats[j++],
 236                                 ((buttons >> ((i << 2) + 8)) & 1) - ((buttons >> ((i << 2) + 6)) & 1));
 237                 }
 238
 239         input_sync(dev);
 240 }
 241
 242 /*
 243  * analog_cooked_read() reads analog joystick data.
 244  */
 245
 246 static int analog_cooked_read(struct analog_port *port)
 247 {
 248         struct gameport *gameport = port->gameport;
 249         u64 time[4], start, loop, now;
 250         unsigned int loopout, timeout;
 251         unsigned char data[4], this, last;
 252         unsigned long flags;
 253         int i, j;
 254
 255         loopout = (ANALOG_LOOP_TIME * port->loop) / 1000;
 256         timeout = ANALOG_MAX_TIME * port->speed;
 257
 258         local_irq_save(flags);
 259         gameport_trigger(gameport);
 260         now = get_time();
 261         local_irq_restore(flags);
 262
 263         start = now;
 264         this = port->mask;
 265         i = 0;
 266
 267         do {
 268                 loop = now;
 269                 last = this;
 270
 271                 local_irq_disable();
 272                 this = gameport_read(gameport) & port->mask;
 273                 now = get_time();
 274                 local_irq_restore(flags);
 275
 276                 if ((last ^ this) && (delta(loop, now) < loopout)) {
 277                         data[i] = last ^ this;
 278                         time[i] = now;
 279                         i++;
 280                 }
 281
 282         } while (this && (i < 4) && (delta(start, now) < timeout));
 283
 284         this <<= 4;
 285
 286         for (--i; i >= 0; i--) {
 287                 this |= data[i];
 288                 for (j = 0; j < 4; j++)
 289                         if (data[i] & (1 << j))
 290                                 port->axes[j] = (delta(start, time[i]) << ANALOG_FUZZ_BITS) / port->loop;
 291         }
 292
 293         return -(this != port->mask);
 294 }
 295
 296 static int analog_button_read(struct analog_port *port, char saitek, char chf)
 297 {
 298         unsigned char u;
 299         int t = 1, i = 0;
 300         int strobe = gameport_time(port->gameport, ANALOG_SAITEK_TIME);
 301
 302         u = gameport_read(port->gameport);
 303
 304         if (!chf) {
 305                 port->buttons = (~u >> 4) & 0xf;
 306                 return 0;
 307         }
 308
 309         port->buttons = 0;
 310
 311         while ((~u & 0xf0) && (i < 16) && t) {
 312                 port->buttons |= 1 << analog_chf[(~u >> 4) & 0xf];
 313                 if (!saitek) return 0;
 314                 udelay(ANALOG_SAITEK_DELAY);
 315                 t = strobe;
 316                 gameport_trigger(port->gameport);
 317                 while (((u = gameport_read(port->gameport)) & port->mask) && t) t--;
 318                 i++;
 319         }
 320
 321         return -(!t || (i == 16));
 322 }
 323
 324 /*
 325  * analog_poll() repeatedly polls the Analog joysticks.
 326  */
 327
 328 static void analog_poll(struct gameport *gameport)
 329 {
 330         struct analog_port *port = gameport_get_drvdata(gameport);
 331         int i;
 332
 333         char saitek = !!(port->analog[0].mask & ANALOG_SAITEK);
 334         char chf = !!(port->analog[0].mask & ANALOG_ANY_CHF);
 335
 336         if (port->cooked) {
 337                 port->bads -= gameport_cooked_read(port->gameport, port->axes, &port->buttons);
 338                 if (chf)
 339                         port->buttons = port->buttons ? (1 << analog_chf[port->buttons]) : 0;
 340                 port->reads++;
 341         } else {
 342                 if (!port->axtime--) {
 343                         port->bads -= analog_cooked_read(port);
 344                         port->bads -= analog_button_read(port, saitek, chf);
 345                         port->reads++;
 346                         port->axtime = ANALOG_AXIS_TIME - 1;
 347                 } else {
 348                         if (!saitek)
 349                                 analog_button_read(port, saitek, chf);
 350                 }
 351         }
 352
 353         for (i = 0; i < 2; i++)
 354                 if (port->analog[i].mask)
 355                         analog_decode(port->analog + i, port->axes, port->initial, port->buttons);
 356 }
 357
 358 /*
 359  * analog_open() is a callback from the input open routine.
 360  */
 361
 362 static int analog_open(struct input_dev *dev)
 363 {
 364         struct analog_port *port = input_get_drvdata(dev);
 365
 366         gameport_start_polling(port->gameport);
 367         return 0;
 368 }
 369
 370 /*
 371  * analog_close() is a callback from the input close routine.
 372  */
 373
 374 static void analog_close(struct input_dev *dev)
 375 {
 376         struct analog_port *port = input_get_drvdata(dev);
 377
 378         gameport_stop_polling(port->gameport);
 379 }
 380
 381 /*
 382  * analog_calibrate_timer() calibrates the timer and computes loop
 383  * and timeout values for a joystick port.
 384  */
 385
 386 static void analog_calibrate_timer(struct analog_port *port)
 387 {
 388         struct gameport *gameport = port->gameport;
 389         unsigned int i, t, tx;
 390         u64 t1, t2, t3;
 391         unsigned long flags;
 392
 393         if (use_ktime) {
 394                 port->speed = 1000000;
 395         } else {
 396                 local_irq_save(flags);
 397                 t1 = get_time();
 398 #ifdef FAKE_TIME
 399                 analog_faketime += 830;
 400 #endif
 401                 mdelay(1);
 402                 t2 = get_time();
 403                 t3 = get_time();
 404                 local_irq_restore(flags);
 405
 406                 port->speed = delta(t1, t2) - delta(t2, t3);
 407         }
 408
 409         tx = ~0;
 410
 411         for (i = 0; i < 50; i++) {
 412                 local_irq_save(flags);
 413                 t1 = get_time();
 414                 for (t = 0; t < 50; t++) {
 415                         gameport_read(gameport);
 416                         t2 = get_time();
 417                 }
 418                 t3 = get_time();
 419                 local_irq_restore(flags);
 420                 udelay(i);
 421                 t = delta(t1, t2) - delta(t2, t3);
 422                 if (t < tx) tx = t;
 423         }
 424
 425         port->loop = tx / 50;
 426 }
 427
 428 /*
 429  * analog_name() constructs a name for an analog joystick.
 430  */
 431
 432 static void analog_name(struct analog *analog)
 433 {
 434         snprintf(analog->name, sizeof(analog->name), "Analog %d-axis %d-button",
 435                  hweight8(analog->mask & ANALOG_AXES_STD),
 436                  hweight8(analog->mask & ANALOG_BTNS_STD) + !!(analog->mask & ANALOG_BTNS_CHF) * 2 +
 437                  hweight16(analog->mask & ANALOG_BTNS_GAMEPAD) + !!(analog->mask & ANALOG_HBTN_CHF) * 4);
 438
 439         if (analog->mask & ANALOG_HATS_ALL)
 440                 snprintf(analog->name, sizeof(analog->name), "%s %d-hat",
 441                          analog->name, hweight16(analog->mask & ANALOG_HATS_ALL));
 442
 443         if (analog->mask & ANALOG_HAT_FCS)
 444                 strlcat(analog->name, " FCS", sizeof(analog->name));
 445         if (analog->mask & ANALOG_ANY_CHF)
 446                 strlcat(analog->name, (analog->mask & ANALOG_SAITEK) ? " Saitek" : " CHF",
 447                         sizeof(analog->name));
 448
 449         strlcat(analog->name, (analog->mask & ANALOG_GAMEPAD) ? " gamepad": " joystick",
 450                 sizeof(analog->name));
 451 }
 452
 453 /*
 454  * analog_init_device()
 455  */
 456
 457 static int analog_init_device(struct analog_port *port, struct analog *analog, int index)
 458 {
 459         struct input_dev *input_dev;
 460         int i, j, t, v, w, x, y, z;
 461         int error;
 462
 463         analog_name(analog);
 464         snprintf(analog->phys, sizeof(analog->phys),
 465                  "%s/input%d", port->gameport->phys, index);
 466         analog->buttons = (analog->mask & ANALOG_GAMEPAD) ? analog_pad_btn : analog_joy_btn;
 467
 468         analog->dev = input_dev = input_allocate_device();
 469         if (!input_dev)
 470                 return -ENOMEM;
 471
 472         input_dev->name = analog->name;
 473         input_dev->phys = analog->phys;
 474         input_dev->id.bustype = BUS_GAMEPORT;
 475         input_dev->id.vendor = GAMEPORT_ID_VENDOR_ANALOG;
 476         input_dev->id.product = analog->mask >> 4;
 477         input_dev->id.version = 0x0100;
 478         input_dev->dev.parent = &port->gameport->dev;
 479
 480         input_set_drvdata(input_dev, port);
 481
 482         input_dev->open = analog_open;
 483         input_dev->close = analog_close;
 484
 485         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 486
 487         for (i = j = 0; i < 4; i++)
 488                 if (analog->mask & (1 << i)) {
 489
 490                         t = analog_axes[j];
 491                         x = port->axes[i];
 492                         y = (port->axes[0] + port->axes[1]) >> 1;
 493                         z = y - port->axes[i];
 494                         z = z > 0 ? z : -z;
 495                         v = (x >> 3);
 496                         w = (x >> 3);
 497
 498                         if ((i == 2 || i == 3) && (j == 2 || j == 3) && (z > (y >> 3)))
 499                                 x = y;
 500
 501                         if (analog->mask & ANALOG_SAITEK) {
 502                                 if (i == 2) x = port->axes[i];
 503                                 v = x - (x >> 2);
 504                                 w = (x >> 4);
 505                         }
 506
 507                         input_set_abs_params(input_dev, t, v, (x << 1) - v, port->fuzz, w);
 508                         j++;
 509                 }
 510
 511         for (i = j = 0; i < 3; i++)
 512                 if (analog->mask & analog_exts[i])
 513                         for (x = 0; x < 2; x++) {
 514                                 t = analog_hats[j++];
 515                                 input_set_abs_params(input_dev, t, -1, 1, 0, 0);
 516                         }
 517
 518         for (i = j = 0; i < 4; i++)
 519                 if (analog->mask & (0x10 << i))
 520                         set_bit(analog->buttons[j++], input_dev->keybit);
 521
 522         if (analog->mask & ANALOG_BTNS_CHF)
 523                 for (i = 0; i < 2; i++)
 524                         set_bit(analog->buttons[j++], input_dev->keybit);
 525
 526         if (analog->mask & ANALOG_HBTN_CHF)
 527                 for (i = 0; i < 4; i++)
 528                         set_bit(analog->buttons[j++], input_dev->keybit);
 529
 530         for (i = 0; i < 4; i++)
 531                 if (analog->mask & (ANALOG_BTN_TL << i))
 532                         set_bit(analog_pads[i], input_dev->keybit);
 533
 534         analog_decode(analog, port->axes, port->initial, port->buttons);
 535
 536         error = input_register_device(analog->dev);
 537         if (error) {
 538                 input_free_device(analog->dev);
 539                 return error;
 540         }
 541
 542         return 0;
 543 }
 544
 545 /*
 546  * analog_init_devices() sets up device-specific values and registers the input devices.
 547  */
 548
 549 static int analog_init_masks(struct analog_port *port)
 550 {
 551         int i;
 552         struct analog *analog = port->analog;
 553         int max[4];
 554
 555         if (!port->mask)
 556                 return -1;
 557
 558         if ((port->mask & 3) != 3 && port->mask != 0xc) {
 559                 printk(KERN_WARNING "analog.c: Unknown joystick device found  "
 560                         "(data=%#x, %s), probably not analog joystick.\n",
 561                         port->mask, port->gameport->phys);
 562                 return -1;
 563         }
 564
 565
 566         i = analog_options[0]; /* FIXME !!! - need to specify options for different ports */
 567
 568         analog[0].mask = i & 0xfffff;
 569
 570         analog[0].mask &= ~(ANALOG_AXES_STD | ANALOG_HAT_FCS | ANALOG_BTNS_GAMEPAD)
 571                         | port->mask | ((port->mask << 8) & ANALOG_HAT_FCS)
 572                         | ((port->mask << 10) & ANALOG_BTNS_TLR) | ((port->mask << 12) & ANALOG_BTNS_TLR2);
 573
 574         analog[0].mask &= ~(ANALOG_HAT2_CHF)
 575                         | ((analog[0].mask & ANALOG_HBTN_CHF) ? 0 : ANALOG_HAT2_CHF);
 576
 577         analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_BTN_TR | ANALOG_BTN_TR2)
 578                         | ((~analog[0].mask & ANALOG_HAT_FCS) >> 8)
 579                         | ((~analog[0].mask & ANALOG_HAT_FCS) << 2)
 580                         | ((~analog[0].mask & ANALOG_HAT_FCS) << 4);
 581
 582         analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_RUDDER)
 583                         | (((~analog[0].mask & ANALOG_BTNS_TLR ) >> 10)
 584                         &  ((~analog[0].mask & ANALOG_BTNS_TLR2) >> 12));
 585
 586         analog[1].mask = ((i >> 20) & 0xff) | ((i >> 12) & 0xf0000);
 587
 588         analog[1].mask &= (analog[0].mask & ANALOG_EXTENSIONS) ? ANALOG_GAMEPAD
 589                         : (((ANALOG_BTNS_STD | port->mask) & ~analog[0].mask) | ANALOG_GAMEPAD);
 590
 591         if (port->cooked) {
 592
 593                 for (i = 0; i < 4; i++) max[i] = port->axes[i] << 1;
 594
 595                 if ((analog[0].mask & 0x7) == 0x7) max[2] = (max[0] + max[1]) >> 1;
 596                 if ((analog[0].mask & 0xb) == 0xb) max[3] = (max[0] + max[1]) >> 1;
 597                 if ((analog[0].mask & ANALOG_BTN_TL) && !(analog[0].mask & ANALOG_BTN_TL2)) max[2] >>= 1;
 598                 if ((analog[0].mask & ANALOG_BTN_TR) && !(analog[0].mask & ANALOG_BTN_TR2)) max[3] >>= 1;
 599                 if ((analog[0].mask & ANALOG_HAT_FCS)) max[3] >>= 1;
 600
 601                 gameport_calibrate(port->gameport, port->axes, max);
 602         }
 603
 604         for (i = 0; i < 4; i++)
 605                 port->initial[i] = port->axes[i];
 606
 607         return -!(analog[0].mask || analog[1].mask);
 608 }
 609
 610 static int analog_init_port(struct gameport *gameport, struct gameport_driver *drv, struct analog_port *port)
 611 {
 612         int i, t, u, v;
 613
 614         port->gameport = gameport;
 615
 616         gameport_set_drvdata(gameport, port);
 617
 618         if (!gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {
 619
 620                 analog_calibrate_timer(port);
 621
 622                 gameport_trigger(gameport);
 623                 t = gameport_read(gameport);
 624                 msleep(ANALOG_MAX_TIME);
 625                 port->mask = (gameport_read(gameport) ^ t) & t & 0xf;
 626                 port->fuzz = (port->speed * ANALOG_FUZZ_MAGIC) / port->loop / 1000 + ANALOG_FUZZ_BITS;
 627
 628                 for (i = 0; i < ANALOG_INIT_RETRIES; i++) {
 629                         if (!analog_cooked_read(port))
 630                                 break;
 631                         msleep(ANALOG_MAX_TIME);
 632                 }
 633
 634                 u = v = 0;
 635
 636                 msleep(ANALOG_MAX_TIME);
 637                 t = gameport_time(gameport, ANALOG_MAX_TIME * 1000);
 638                 gameport_trigger(gameport);
 639                 while ((gameport_read(port->gameport) & port->mask) && (u < t))
 640                         u++;
 641                 udelay(ANALOG_SAITEK_DELAY);
 642                 t = gameport_time(gameport, ANALOG_SAITEK_TIME);
 643                 gameport_trigger(gameport);
 644                 while ((gameport_read(port->gameport) & port->mask) && (v < t))
 645                         v++;
 646
 647                 if (v < (u >> 1)) { /* FIXME - more than one port */
 648                         analog_options[0] |= /* FIXME - more than one port */
 649                                 ANALOG_SAITEK | ANALOG_BTNS_CHF | ANALOG_HBTN_CHF | ANALOG_HAT1_CHF;
 650                         return 0;
 651                 }
 652
 653                 gameport_close(gameport);
 654         }
 655
 656         if (!gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {
 657
 658                 for (i = 0; i < ANALOG_INIT_RETRIES; i++)
 659                         if (!gameport_cooked_read(gameport, port->axes, &port->buttons))
 660                                 break;
 661                 for (i = 0; i < 4; i++)
 662                         if (port->axes[i] != -1)
 663                                 port->mask |= 1 << i;
 664
 665                 port->fuzz = gameport->fuzz;
 666                 port->cooked = 1;
 667                 return 0;
 668         }
 669
 670         return gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
 671 }
 672
 673 static int analog_connect(struct gameport *gameport, struct gameport_driver *drv)
 674 {
 675         struct analog_port *port;
 676         int i;
 677         int err;
 678
 679         if (!(port = kzalloc(sizeof(struct analog_port), GFP_KERNEL)))
 680                 return - ENOMEM;
 681
 682         err = analog_init_port(gameport, drv, port);
 683         if (err)
 684                 goto fail1;
 685
 686         err = analog_init_masks(port);
 687         if (err)
 688                 goto fail2;
 689
 690         gameport_set_poll_handler(gameport, analog_poll);
 691         gameport_set_poll_interval(gameport, 10);
 692
 693         for (i = 0; i < 2; i++)
 694                 if (port->analog[i].mask) {
 695                         err = analog_init_device(port, port->analog + i, i);
 696                         if (err)
 697                                 goto fail3;
 698                 }
 699
 700         return 0;
 701
 702  fail3: while (--i >= 0)
 703                 if (port->analog[i].mask)
 704                         input_unregister_device(port->analog[i].dev);
 705  fail2: gameport_close(gameport);
 706  fail1: gameport_set_drvdata(gameport, NULL);
 707         kfree(port);
 708         return err;
 709 }
 710
 711 static void analog_disconnect(struct gameport *gameport)
 712 {
 713         struct analog_port *port = gameport_get_drvdata(gameport);
 714         int i;
 715
 716         for (i = 0; i < 2; i++)
 717                 if (port->analog[i].mask)
 718                         input_unregister_device(port->analog[i].dev);
 719         gameport_close(gameport);
 720         gameport_set_drvdata(gameport, NULL);
 721         printk(KERN_INFO "analog.c: %d out of %d reads (%d%%) on %s failed\n",
 722                 port->bads, port->reads, port->reads ? (port->bads * 100 / port->reads) : 0,
 723                 port->gameport->phys);
 724         kfree(port);
 725 }
 726
 727 struct analog_types {
 728         char *name;
 729         int value;
 730 };
 731
 732 static struct analog_types analog_types[] = {
 733         { "none",       0x00000000 },
 734         { "auto",       0x000000ff },
 735         { "2btn",       0x0000003f },
 736         { "y-joy",      0x0cc00033 },
 737         { "y-pad",      0x8cc80033 },
 738         { "fcs",        0x000008f7 },
 739         { "chf",        0x000002ff },
 740         { "fullchf",    0x000007ff },
 741         { "gamepad",    0x000830f3 },
 742         { "gamepad8",   0x0008f0f3 },
 743         { NULL, 0 }
 744 };
 745
 746 static void analog_parse_options(void)
 747 {
 748         int i, j;
 749         char *end;
 750
 751         for (i = 0; i < js_nargs; i++) {
 752
 753                 for (j = 0; analog_types[j].name; j++)
 754                         if (!strcmp(analog_types[j].name, js[i])) {
 755                                 analog_options[i] = analog_types[j].value;
 756                                 break;
 757                         }
 758                 if (analog_types[j].name) continue;
 759
 760                 analog_options[i] = simple_strtoul(js[i], &end, 0);
 761                 if (end != js[i]) continue;
 762
 763                 analog_options[i] = 0xff;
 764                 if (!strlen(js[i])) continue;
 765
 766                 printk(KERN_WARNING "analog.c: Bad config for port %d - \"%s\"\n", i, js[i]);
 767         }
 768
 769         for (; i < ANALOG_PORTS; i++)
 770                 analog_options[i] = 0xff;
 771 }
 772
 773 /*
 774  * The gameport device structure.
 775  */
 776
 777 static struct gameport_driver analog_drv = {
 778         .driver         = {
 779                 .name   = "analog",
 780         },
 781         .description    = DRIVER_DESC,
 782         .connect        = analog_connect,
 783         .disconnect     = analog_disconnect,
 784 };
 785
 786 static int __init analog_init(void)
 787 {
 788         analog_parse_options();
 789         return gameport_register_driver(&analog_drv);
 790 }
 791
 792 static void __exit analog_exit(void)
 793 {
 794         gameport_unregister_driver(&analog_drv);
 795 }
 796
 797 module_init(analog_init);
 798 module_exit(analog_exit);