linux/drivers/input/joystick/analog.c
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   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 * 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/bitops.h>
  34#include <linux/init.h>
  35#include <linux/input.h>
  36#include <linux/gameport.h>
  37#include <linux/jiffies.h>
  38#include <linux/timex.h>
  39#include <linux/timekeeping.h>
  40
  41#define DRIVER_DESC     "Analog joystick and gamepad driver"
  42
  43MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  44MODULE_DESCRIPTION(DRIVER_DESC);
  45MODULE_LICENSE("GPL");
  46
  47static bool use_ktime = true;
  48module_param(use_ktime, bool, 0400);
  49MODULE_PARM_DESC(use_ktime, "Use ktime for measuring I/O speed");
  50
  51/*
  52 * Option parsing.
  53 */
  54
  55#define ANALOG_PORTS            16
  56
  57static char *js[ANALOG_PORTS];
  58static unsigned int js_nargs;
  59static int analog_options[ANALOG_PORTS];
  60module_param_array_named(map, js, charp, &js_nargs, 0);
  61MODULE_PARM_DESC(map, "Describes analog joysticks type/capabilities");
  62
  63/*
  64 * Times, feature definitions.
  65 */
  66
  67#define ANALOG_RUDDER           0x00004
  68#define ANALOG_THROTTLE         0x00008
  69#define ANALOG_AXES_STD         0x0000f
  70#define ANALOG_BTNS_STD         0x000f0
  71
  72#define ANALOG_BTNS_CHF         0x00100
  73#define ANALOG_HAT1_CHF         0x00200
  74#define ANALOG_HAT2_CHF         0x00400
  75#define ANALOG_HAT_FCS          0x00800
  76#define ANALOG_HATS_ALL         0x00e00
  77#define ANALOG_BTN_TL           0x01000
  78#define ANALOG_BTN_TR           0x02000
  79#define ANALOG_BTN_TL2          0x04000
  80#define ANALOG_BTN_TR2          0x08000
  81#define ANALOG_BTNS_TLR         0x03000
  82#define ANALOG_BTNS_TLR2        0x0c000
  83#define ANALOG_BTNS_GAMEPAD     0x0f000
  84
  85#define ANALOG_HBTN_CHF         0x10000
  86#define ANALOG_ANY_CHF          0x10700
  87#define ANALOG_SAITEK           0x20000
  88#define ANALOG_EXTENSIONS       0x7ff00
  89#define ANALOG_GAMEPAD          0x80000
  90
  91#define ANALOG_MAX_TIME         3       /* 3 ms */
  92#define ANALOG_LOOP_TIME        2000    /* 2 * loop */
  93#define ANALOG_SAITEK_DELAY     200     /* 200 us */
  94#define ANALOG_SAITEK_TIME      2000    /* 2000 us */
  95#define ANALOG_AXIS_TIME        2       /* 2 * refresh */
  96#define ANALOG_INIT_RETRIES     8       /* 8 times */
  97#define ANALOG_FUZZ_BITS        2       /* 2 bit more */
  98#define ANALOG_FUZZ_MAGIC       36      /* 36 u*ms/loop */
  99
 100#define ANALOG_MAX_NAME_LENGTH  128
 101#define ANALOG_MAX_PHYS_LENGTH  32
 102
 103static short analog_axes[] = { ABS_X, ABS_Y, ABS_RUDDER, ABS_THROTTLE };
 104static short analog_hats[] = { ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, ABS_HAT2X, ABS_HAT2Y };
 105static short analog_pads[] = { BTN_Y, BTN_Z, BTN_TL, BTN_TR };
 106static short analog_exts[] = { ANALOG_HAT1_CHF, ANALOG_HAT2_CHF, ANALOG_HAT_FCS };
 107static short analog_pad_btn[] = { BTN_A, BTN_B, BTN_C, BTN_X, BTN_TL2, BTN_TR2, BTN_SELECT, BTN_START, BTN_MODE, BTN_BASE };
 108static short analog_joy_btn[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2,
 109                                  BTN_BASE3, BTN_BASE4, BTN_BASE5, BTN_BASE6 };
 110
 111static unsigned char analog_chf[] = { 0xf, 0x0, 0x1, 0x9, 0x2, 0x4, 0xc, 0x8, 0x3, 0x5, 0xb, 0x7, 0xd, 0xe, 0xa, 0x6 };
 112
 113struct analog {
 114        struct input_dev *dev;
 115        int mask;
 116        short *buttons;
 117        char name[ANALOG_MAX_NAME_LENGTH];
 118        char phys[ANALOG_MAX_PHYS_LENGTH];
 119};
 120
 121struct analog_port {
 122        struct gameport *gameport;
 123        struct analog analog[2];
 124        unsigned char mask;
 125        char saitek;
 126        char cooked;
 127        int bads;
 128        int reads;
 129        int speed;
 130        int loop;
 131        int fuzz;
 132        int axes[4];
 133        int buttons;
 134        int initial[4];
 135        int axtime;
 136};
 137
 138/*
 139 * Time macros.
 140 */
 141
 142#ifdef __i386__
 143
 144#include <linux/i8253.h>
 145
 146#define GET_TIME(x)     do { if (boot_cpu_has(X86_FEATURE_TSC)) x = (unsigned int)rdtsc(); else x = get_time_pit(); } while (0)
 147#define DELTA(x,y)      (boot_cpu_has(X86_FEATURE_TSC) ? ((y) - (x)) : ((x) - (y) + ((x) < (y) ? PIT_TICK_RATE / HZ : 0)))
 148#define TIME_NAME       (boot_cpu_has(X86_FEATURE_TSC)?"TSC":"PIT")
 149static unsigned int get_time_pit(void)
 150{
 151        unsigned long flags;
 152        unsigned int count;
 153
 154        raw_spin_lock_irqsave(&i8253_lock, flags);
 155        outb_p(0x00, 0x43);
 156        count = inb_p(0x40);
 157        count |= inb_p(0x40) << 8;
 158        raw_spin_unlock_irqrestore(&i8253_lock, flags);
 159
 160        return count;
 161}
 162#elif defined(__x86_64__)
 163#define GET_TIME(x)     do { x = (unsigned int)rdtsc(); } while (0)
 164#define DELTA(x,y)      ((y)-(x))
 165#define TIME_NAME       "TSC"
 166#elif defined(__alpha__) || defined(CONFIG_MN10300) || defined(CONFIG_ARM) || defined(CONFIG_ARM64) || defined(CONFIG_TILE)
 167#define GET_TIME(x)     do { x = get_cycles(); } while (0)
 168#define DELTA(x,y)      ((y)-(x))
 169#define TIME_NAME       "get_cycles"
 170#else
 171#define FAKE_TIME
 172static unsigned long analog_faketime = 0;
 173#define GET_TIME(x)     do { x = analog_faketime++; } while(0)
 174#define DELTA(x,y)      ((y)-(x))
 175#define TIME_NAME       "Unreliable"
 176#warning Precise timer not defined for this architecture.
 177#endif
 178
 179static inline u64 get_time(void)
 180{
 181        if (use_ktime) {
 182                return ktime_get_ns();
 183        } else {
 184                unsigned int x;
 185                GET_TIME(x);
 186                return x;
 187        }
 188}
 189
 190static inline unsigned int delta(u64 x, u64 y)
 191{
 192        if (use_ktime)
 193                return y - x;
 194        else
 195                return DELTA((unsigned int)x, (unsigned int)y);
 196}
 197
 198/*
 199 * analog_decode() decodes analog joystick data and reports input events.
 200 */
 201
 202static void analog_decode(struct analog *analog, int *axes, int *initial, int buttons)
 203{
 204        struct input_dev *dev = analog->dev;
 205        int i, j;
 206
 207        if (analog->mask & ANALOG_HAT_FCS)
 208                for (i = 0; i < 4; i++)
 209                        if (axes[3] < ((initial[3] * ((i << 1) + 1)) >> 3)) {
 210                                buttons |= 1 << (i + 14);
 211                                break;
 212                        }
 213
 214        for (i = j = 0; i < 6; i++)
 215                if (analog->mask & (0x10 << i))
 216                        input_report_key(dev, analog->buttons[j++], (buttons >> i) & 1);
 217
 218        if (analog->mask & ANALOG_HBTN_CHF)
 219                for (i = 0; i < 4; i++)
 220                        input_report_key(dev, analog->buttons[j++], (buttons >> (i + 10)) & 1);
 221
 222        if (analog->mask & ANALOG_BTN_TL)
 223                input_report_key(dev, analog_pads[0], axes[2] < (initial[2] >> 1));
 224        if (analog->mask & ANALOG_BTN_TR)
 225                input_report_key(dev, analog_pads[1], axes[3] < (initial[3] >> 1));
 226        if (analog->mask & ANALOG_BTN_TL2)
 227                input_report_key(dev, analog_pads[2], axes[2] > (initial[2] + (initial[2] >> 1)));
 228        if (analog->mask & ANALOG_BTN_TR2)
 229                input_report_key(dev, analog_pads[3], axes[3] > (initial[3] + (initial[3] >> 1)));
 230
 231        for (i = j = 0; i < 4; i++)
 232                if (analog->mask & (1 << i))
 233                        input_report_abs(dev, analog_axes[j++], axes[i]);
 234
 235        for (i = j = 0; i < 3; i++)
 236                if (analog->mask & analog_exts[i]) {
 237                        input_report_abs(dev, analog_hats[j++],
 238                                ((buttons >> ((i << 2) + 7)) & 1) - ((buttons >> ((i << 2) + 9)) & 1));
 239                        input_report_abs(dev, analog_hats[j++],
 240                                ((buttons >> ((i << 2) + 8)) & 1) - ((buttons >> ((i << 2) + 6)) & 1));
 241                }
 242
 243        input_sync(dev);
 244}
 245
 246/*
 247 * analog_cooked_read() reads analog joystick data.
 248 */
 249
 250static int analog_cooked_read(struct analog_port *port)
 251{
 252        struct gameport *gameport = port->gameport;
 253        u64 time[4], start, loop, now;
 254        unsigned int loopout, timeout;
 255        unsigned char data[4], this, last;
 256        unsigned long flags;
 257        int i, j;
 258
 259        loopout = (ANALOG_LOOP_TIME * port->loop) / 1000;
 260        timeout = ANALOG_MAX_TIME * port->speed;
 261
 262        local_irq_save(flags);
 263        gameport_trigger(gameport);
 264        now = get_time();
 265        local_irq_restore(flags);
 266
 267        start = now;
 268        this = port->mask;
 269        i = 0;
 270
 271        do {
 272                loop = now;
 273                last = this;
 274
 275                local_irq_disable();
 276                this = gameport_read(gameport) & port->mask;
 277                now = get_time();
 278                local_irq_restore(flags);
 279
 280                if ((last ^ this) && (delta(loop, now) < loopout)) {
 281                        data[i] = last ^ this;
 282                        time[i] = now;
 283                        i++;
 284                }
 285
 286        } while (this && (i < 4) && (delta(start, now) < timeout));
 287
 288        this <<= 4;
 289
 290        for (--i; i >= 0; i--) {
 291                this |= data[i];
 292                for (j = 0; j < 4; j++)
 293                        if (data[i] & (1 << j))
 294                                port->axes[j] = (delta(start, time[i]) << ANALOG_FUZZ_BITS) / port->loop;
 295        }
 296
 297        return -(this != port->mask);
 298}
 299
 300static int analog_button_read(struct analog_port *port, char saitek, char chf)
 301{
 302        unsigned char u;
 303        int t = 1, i = 0;
 304        int strobe = gameport_time(port->gameport, ANALOG_SAITEK_TIME);
 305
 306        u = gameport_read(port->gameport);
 307
 308        if (!chf) {
 309                port->buttons = (~u >> 4) & 0xf;
 310                return 0;
 311        }
 312
 313        port->buttons = 0;
 314
 315        while ((~u & 0xf0) && (i < 16) && t) {
 316                port->buttons |= 1 << analog_chf[(~u >> 4) & 0xf];
 317                if (!saitek) return 0;
 318                udelay(ANALOG_SAITEK_DELAY);
 319                t = strobe;
 320                gameport_trigger(port->gameport);
 321                while (((u = gameport_read(port->gameport)) & port->mask) && t) t--;
 322                i++;
 323        }
 324
 325        return -(!t || (i == 16));
 326}
 327
 328/*
 329 * analog_poll() repeatedly polls the Analog joysticks.
 330 */
 331
 332static void analog_poll(struct gameport *gameport)
 333{
 334        struct analog_port *port = gameport_get_drvdata(gameport);
 335        int i;
 336
 337        char saitek = !!(port->analog[0].mask & ANALOG_SAITEK);
 338        char chf = !!(port->analog[0].mask & ANALOG_ANY_CHF);
 339
 340        if (port->cooked) {
 341                port->bads -= gameport_cooked_read(port->gameport, port->axes, &port->buttons);
 342                if (chf)
 343                        port->buttons = port->buttons ? (1 << analog_chf[port->buttons]) : 0;
 344                port->reads++;
 345        } else {
 346                if (!port->axtime--) {
 347                        port->bads -= analog_cooked_read(port);
 348                        port->bads -= analog_button_read(port, saitek, chf);
 349                        port->reads++;
 350                        port->axtime = ANALOG_AXIS_TIME - 1;
 351                } else {
 352                        if (!saitek)
 353                                analog_button_read(port, saitek, chf);
 354                }
 355        }
 356
 357        for (i = 0; i < 2; i++)
 358                if (port->analog[i].mask)
 359                        analog_decode(port->analog + i, port->axes, port->initial, port->buttons);
 360}
 361
 362/*
 363 * analog_open() is a callback from the input open routine.
 364 */
 365
 366static int analog_open(struct input_dev *dev)
 367{
 368        struct analog_port *port = input_get_drvdata(dev);
 369
 370        gameport_start_polling(port->gameport);
 371        return 0;
 372}
 373
 374/*
 375 * analog_close() is a callback from the input close routine.
 376 */
 377
 378static void analog_close(struct input_dev *dev)
 379{
 380        struct analog_port *port = input_get_drvdata(dev);
 381
 382        gameport_stop_polling(port->gameport);
 383}
 384
 385/*
 386 * analog_calibrate_timer() calibrates the timer and computes loop
 387 * and timeout values for a joystick port.
 388 */
 389
 390static void analog_calibrate_timer(struct analog_port *port)
 391{
 392        struct gameport *gameport = port->gameport;
 393        unsigned int i, t, tx;
 394        u64 t1, t2, t3;
 395        unsigned long flags;
 396
 397        if (use_ktime) {
 398                port->speed = 1000000;
 399        } else {
 400                local_irq_save(flags);
 401                t1 = get_time();
 402#ifdef FAKE_TIME
 403                analog_faketime += 830;
 404#endif
 405                mdelay(1);
 406                t2 = get_time();
 407                t3 = get_time();
 408                local_irq_restore(flags);
 409
 410                port->speed = delta(t1, t2) - delta(t2, t3);
 411        }
 412
 413        tx = ~0;
 414
 415        for (i = 0; i < 50; i++) {
 416                local_irq_save(flags);
 417                t1 = get_time();
 418                for (t = 0; t < 50; t++) {
 419                        gameport_read(gameport);
 420                        t2 = get_time();
 421                }
 422                t3 = get_time();
 423                local_irq_restore(flags);
 424                udelay(i);
 425                t = delta(t1, t2) - delta(t2, t3);
 426                if (t < tx) tx = t;
 427        }
 428
 429        port->loop = tx / 50;
 430}
 431
 432/*
 433 * analog_name() constructs a name for an analog joystick.
 434 */
 435
 436static void analog_name(struct analog *analog)
 437{
 438        snprintf(analog->name, sizeof(analog->name), "Analog %d-axis %d-button",
 439                 hweight8(analog->mask & ANALOG_AXES_STD),
 440                 hweight8(analog->mask & ANALOG_BTNS_STD) + !!(analog->mask & ANALOG_BTNS_CHF) * 2 +
 441                 hweight16(analog->mask & ANALOG_BTNS_GAMEPAD) + !!(analog->mask & ANALOG_HBTN_CHF) * 4);
 442
 443        if (analog->mask & ANALOG_HATS_ALL)
 444                snprintf(analog->name, sizeof(analog->name), "%s %d-hat",
 445                         analog->name, hweight16(analog->mask & ANALOG_HATS_ALL));
 446
 447        if (analog->mask & ANALOG_HAT_FCS)
 448                strlcat(analog->name, " FCS", sizeof(analog->name));
 449        if (analog->mask & ANALOG_ANY_CHF)
 450                strlcat(analog->name, (analog->mask & ANALOG_SAITEK) ? " Saitek" : " CHF",
 451                        sizeof(analog->name));
 452
 453        strlcat(analog->name, (analog->mask & ANALOG_GAMEPAD) ? " gamepad": " joystick",
 454                sizeof(analog->name));
 455}
 456
 457/*
 458 * analog_init_device()
 459 */
 460
 461static int analog_init_device(struct analog_port *port, struct analog *analog, int index)
 462{
 463        struct input_dev *input_dev;
 464        int i, j, t, v, w, x, y, z;
 465        int error;
 466
 467        analog_name(analog);
 468        snprintf(analog->phys, sizeof(analog->phys),
 469                 "%s/input%d", port->gameport->phys, index);
 470        analog->buttons = (analog->mask & ANALOG_GAMEPAD) ? analog_pad_btn : analog_joy_btn;
 471
 472        analog->dev = input_dev = input_allocate_device();
 473        if (!input_dev)
 474                return -ENOMEM;
 475
 476        input_dev->name = analog->name;
 477        input_dev->phys = analog->phys;
 478        input_dev->id.bustype = BUS_GAMEPORT;
 479        input_dev->id.vendor = GAMEPORT_ID_VENDOR_ANALOG;
 480        input_dev->id.product = analog->mask >> 4;
 481        input_dev->id.version = 0x0100;
 482        input_dev->dev.parent = &port->gameport->dev;
 483
 484        input_set_drvdata(input_dev, port);
 485
 486        input_dev->open = analog_open;
 487        input_dev->close = analog_close;
 488
 489        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 490
 491        for (i = j = 0; i < 4; i++)
 492                if (analog->mask & (1 << i)) {
 493
 494                        t = analog_axes[j];
 495                        x = port->axes[i];
 496                        y = (port->axes[0] + port->axes[1]) >> 1;
 497                        z = y - port->axes[i];
 498                        z = z > 0 ? z : -z;
 499                        v = (x >> 3);
 500                        w = (x >> 3);
 501
 502                        if ((i == 2 || i == 3) && (j == 2 || j == 3) && (z > (y >> 3)))
 503                                x = y;
 504
 505                        if (analog->mask & ANALOG_SAITEK) {
 506                                if (i == 2) x = port->axes[i];
 507                                v = x - (x >> 2);
 508                                w = (x >> 4);
 509                        }
 510
 511                        input_set_abs_params(input_dev, t, v, (x << 1) - v, port->fuzz, w);
 512                        j++;
 513                }
 514
 515        for (i = j = 0; i < 3; i++)
 516                if (analog->mask & analog_exts[i])
 517                        for (x = 0; x < 2; x++) {
 518                                t = analog_hats[j++];
 519                                input_set_abs_params(input_dev, t, -1, 1, 0, 0);
 520                        }
 521
 522        for (i = j = 0; i < 4; i++)
 523                if (analog->mask & (0x10 << i))
 524                        set_bit(analog->buttons[j++], input_dev->keybit);
 525
 526        if (analog->mask & ANALOG_BTNS_CHF)
 527                for (i = 0; i < 2; i++)
 528                        set_bit(analog->buttons[j++], input_dev->keybit);
 529
 530        if (analog->mask & ANALOG_HBTN_CHF)
 531                for (i = 0; i < 4; i++)
 532                        set_bit(analog->buttons[j++], input_dev->keybit);
 533
 534        for (i = 0; i < 4; i++)
 535                if (analog->mask & (ANALOG_BTN_TL << i))
 536                        set_bit(analog_pads[i], input_dev->keybit);
 537
 538        analog_decode(analog, port->axes, port->initial, port->buttons);
 539
 540        error = input_register_device(analog->dev);
 541        if (error) {
 542                input_free_device(analog->dev);
 543                return error;
 544        }
 545
 546        return 0;
 547}
 548
 549/*
 550 * analog_init_devices() sets up device-specific values and registers the input devices.
 551 */
 552
 553static int analog_init_masks(struct analog_port *port)
 554{
 555        int i;
 556        struct analog *analog = port->analog;
 557        int max[4];
 558
 559        if (!port->mask)
 560                return -1;
 561
 562        if ((port->mask & 3) != 3 && port->mask != 0xc) {
 563                printk(KERN_WARNING "analog.c: Unknown joystick device found  "
 564                        "(data=%#x, %s), probably not analog joystick.\n",
 565                        port->mask, port->gameport->phys);
 566                return -1;
 567        }
 568
 569
 570        i = analog_options[0]; /* FIXME !!! - need to specify options for different ports */
 571
 572        analog[0].mask = i & 0xfffff;
 573
 574        analog[0].mask &= ~(ANALOG_AXES_STD | ANALOG_HAT_FCS | ANALOG_BTNS_GAMEPAD)
 575                        | port->mask | ((port->mask << 8) & ANALOG_HAT_FCS)
 576                        | ((port->mask << 10) & ANALOG_BTNS_TLR) | ((port->mask << 12) & ANALOG_BTNS_TLR2);
 577
 578        analog[0].mask &= ~(ANALOG_HAT2_CHF)
 579                        | ((analog[0].mask & ANALOG_HBTN_CHF) ? 0 : ANALOG_HAT2_CHF);
 580
 581        analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_BTN_TR | ANALOG_BTN_TR2)
 582                        | ((~analog[0].mask & ANALOG_HAT_FCS) >> 8)
 583                        | ((~analog[0].mask & ANALOG_HAT_FCS) << 2)
 584                        | ((~analog[0].mask & ANALOG_HAT_FCS) << 4);
 585
 586        analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_RUDDER)
 587                        | (((~analog[0].mask & ANALOG_BTNS_TLR ) >> 10)
 588                        &  ((~analog[0].mask & ANALOG_BTNS_TLR2) >> 12));
 589
 590        analog[1].mask = ((i >> 20) & 0xff) | ((i >> 12) & 0xf0000);
 591
 592        analog[1].mask &= (analog[0].mask & ANALOG_EXTENSIONS) ? ANALOG_GAMEPAD
 593                        : (((ANALOG_BTNS_STD | port->mask) & ~analog[0].mask) | ANALOG_GAMEPAD);
 594
 595        if (port->cooked) {
 596
 597                for (i = 0; i < 4; i++) max[i] = port->axes[i] << 1;
 598
 599                if ((analog[0].mask & 0x7) == 0x7) max[2] = (max[0] + max[1]) >> 1;
 600                if ((analog[0].mask & 0xb) == 0xb) max[3] = (max[0] + max[1]) >> 1;
 601                if ((analog[0].mask & ANALOG_BTN_TL) && !(analog[0].mask & ANALOG_BTN_TL2)) max[2] >>= 1;
 602                if ((analog[0].mask & ANALOG_BTN_TR) && !(analog[0].mask & ANALOG_BTN_TR2)) max[3] >>= 1;
 603                if ((analog[0].mask & ANALOG_HAT_FCS)) max[3] >>= 1;
 604
 605                gameport_calibrate(port->gameport, port->axes, max);
 606        }
 607
 608        for (i = 0; i < 4; i++)
 609                port->initial[i] = port->axes[i];
 610
 611        return -!(analog[0].mask || analog[1].mask);
 612}
 613
 614static int analog_init_port(struct gameport *gameport, struct gameport_driver *drv, struct analog_port *port)
 615{
 616        int i, t, u, v;
 617
 618        port->gameport = gameport;
 619
 620        gameport_set_drvdata(gameport, port);
 621
 622        if (!gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {
 623
 624                analog_calibrate_timer(port);
 625
 626                gameport_trigger(gameport);
 627                t = gameport_read(gameport);
 628                msleep(ANALOG_MAX_TIME);
 629                port->mask = (gameport_read(gameport) ^ t) & t & 0xf;
 630                port->fuzz = (port->speed * ANALOG_FUZZ_MAGIC) / port->loop / 1000 + ANALOG_FUZZ_BITS;
 631
 632                for (i = 0; i < ANALOG_INIT_RETRIES; i++) {
 633                        if (!analog_cooked_read(port))
 634                                break;
 635                        msleep(ANALOG_MAX_TIME);
 636                }
 637
 638                u = v = 0;
 639
 640                msleep(ANALOG_MAX_TIME);
 641                t = gameport_time(gameport, ANALOG_MAX_TIME * 1000);
 642                gameport_trigger(gameport);
 643                while ((gameport_read(port->gameport) & port->mask) && (u < t))
 644                        u++;
 645                udelay(ANALOG_SAITEK_DELAY);
 646                t = gameport_time(gameport, ANALOG_SAITEK_TIME);
 647                gameport_trigger(gameport);
 648                while ((gameport_read(port->gameport) & port->mask) && (v < t))
 649                        v++;
 650
 651                if (v < (u >> 1)) { /* FIXME - more than one port */
 652                        analog_options[0] |= /* FIXME - more than one port */
 653                                ANALOG_SAITEK | ANALOG_BTNS_CHF | ANALOG_HBTN_CHF | ANALOG_HAT1_CHF;
 654                        return 0;
 655                }
 656
 657                gameport_close(gameport);
 658        }
 659
 660        if (!gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {
 661
 662                for (i = 0; i < ANALOG_INIT_RETRIES; i++)
 663                        if (!gameport_cooked_read(gameport, port->axes, &port->buttons))
 664                                break;
 665                for (i = 0; i < 4; i++)
 666                        if (port->axes[i] != -1)
 667                                port->mask |= 1 << i;
 668
 669                port->fuzz = gameport->fuzz;
 670                port->cooked = 1;
 671                return 0;
 672        }
 673
 674        return gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
 675}
 676
 677static int analog_connect(struct gameport *gameport, struct gameport_driver *drv)
 678{
 679        struct analog_port *port;
 680        int i;
 681        int err;
 682
 683        if (!(port = kzalloc(sizeof(struct analog_port), GFP_KERNEL)))
 684                return - ENOMEM;
 685
 686        err = analog_init_port(gameport, drv, port);
 687        if (err)
 688                goto fail1;
 689
 690        err = analog_init_masks(port);
 691        if (err)
 692                goto fail2;
 693
 694        gameport_set_poll_handler(gameport, analog_poll);
 695        gameport_set_poll_interval(gameport, 10);
 696
 697        for (i = 0; i < 2; i++)
 698                if (port->analog[i].mask) {
 699                        err = analog_init_device(port, port->analog + i, i);
 700                        if (err)
 701                                goto fail3;
 702                }
 703
 704        return 0;
 705
 706 fail3: while (--i >= 0)
 707                if (port->analog[i].mask)
 708                        input_unregister_device(port->analog[i].dev);
 709 fail2: gameport_close(gameport);
 710 fail1: gameport_set_drvdata(gameport, NULL);
 711        kfree(port);
 712        return err;
 713}
 714
 715static void analog_disconnect(struct gameport *gameport)
 716{
 717        struct analog_port *port = gameport_get_drvdata(gameport);
 718        int i;
 719
 720        for (i = 0; i < 2; i++)
 721                if (port->analog[i].mask)
 722                        input_unregister_device(port->analog[i].dev);
 723        gameport_close(gameport);
 724        gameport_set_drvdata(gameport, NULL);
 725        printk(KERN_INFO "analog.c: %d out of %d reads (%d%%) on %s failed\n",
 726                port->bads, port->reads, port->reads ? (port->bads * 100 / port->reads) : 0,
 727                port->gameport->phys);
 728        kfree(port);
 729}
 730
 731struct analog_types {
 732        char *name;
 733        int value;
 734};
 735
 736static struct analog_types analog_types[] = {
 737        { "none",       0x00000000 },
 738        { "auto",       0x000000ff },
 739        { "2btn",       0x0000003f },
 740        { "y-joy",      0x0cc00033 },
 741        { "y-pad",      0x8cc80033 },
 742        { "fcs",        0x000008f7 },
 743        { "chf",        0x000002ff },
 744        { "fullchf",    0x000007ff },
 745        { "gamepad",    0x000830f3 },
 746        { "gamepad8",   0x0008f0f3 },
 747        { NULL, 0 }
 748};
 749
 750static void analog_parse_options(void)
 751{
 752        int i, j;
 753        char *end;
 754
 755        for (i = 0; i < js_nargs; i++) {
 756
 757                for (j = 0; analog_types[j].name; j++)
 758                        if (!strcmp(analog_types[j].name, js[i])) {
 759                                analog_options[i] = analog_types[j].value;
 760                                break;
 761                        }
 762                if (analog_types[j].name) continue;
 763
 764                analog_options[i] = simple_strtoul(js[i], &end, 0);
 765                if (end != js[i]) continue;
 766
 767                analog_options[i] = 0xff;
 768                if (!strlen(js[i])) continue;
 769
 770                printk(KERN_WARNING "analog.c: Bad config for port %d - \"%s\"\n", i, js[i]);
 771        }
 772
 773        for (; i < ANALOG_PORTS; i++)
 774                analog_options[i] = 0xff;
 775}
 776
 777/*
 778 * The gameport device structure.
 779 */
 780
 781static struct gameport_driver analog_drv = {
 782        .driver         = {
 783                .name   = "analog",
 784        },
 785        .description    = DRIVER_DESC,
 786        .connect        = analog_connect,
 787        .disconnect     = analog_disconnect,
 788};
 789
 790static int __init analog_init(void)
 791{
 792        analog_parse_options();
 793        return gameport_register_driver(&analog_drv);
 794}
 795
 796static void __exit analog_exit(void)
 797{
 798        gameport_unregister_driver(&analog_drv);
 799}
 800
 801module_init(analog_init);
 802module_exit(analog_exit);
 803