linux/drivers/input/joystick/analog.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Copyright (c) 1996-2001 Vojtech Pavlik
   4 */
   5
   6/*
   7 * Analog joystick and gamepad driver for Linux
   8 */
   9
  10/*
  11 */
  12
  13#include <linux/delay.h>
  14#include <linux/kernel.h>
  15#include <linux/module.h>
  16#include <linux/slab.h>
  17#include <linux/bitops.h>
  18#include <linux/init.h>
  19#include <linux/input.h>
  20#include <linux/gameport.h>
  21#include <linux/jiffies.h>
  22#include <linux/timex.h>
  23#include <linux/timekeeping.h>
  24
  25#define DRIVER_DESC     "Analog joystick and gamepad driver"
  26
  27MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  28MODULE_DESCRIPTION(DRIVER_DESC);
  29MODULE_LICENSE("GPL");
  30
  31static bool use_ktime = true;
  32module_param(use_ktime, bool, 0400);
  33MODULE_PARM_DESC(use_ktime, "Use ktime for measuring I/O speed");
  34
  35/*
  36 * Option parsing.
  37 */
  38
  39#define ANALOG_PORTS            16
  40
  41static char *js[ANALOG_PORTS];
  42static unsigned int js_nargs;
  43static int analog_options[ANALOG_PORTS];
  44module_param_array_named(map, js, charp, &js_nargs, 0);
  45MODULE_PARM_DESC(map, "Describes analog joysticks type/capabilities");
  46
  47/*
  48 * Times, feature definitions.
  49 */
  50
  51#define ANALOG_RUDDER           0x00004
  52#define ANALOG_THROTTLE         0x00008
  53#define ANALOG_AXES_STD         0x0000f
  54#define ANALOG_BTNS_STD         0x000f0
  55
  56#define ANALOG_BTNS_CHF         0x00100
  57#define ANALOG_HAT1_CHF         0x00200
  58#define ANALOG_HAT2_CHF         0x00400
  59#define ANALOG_HAT_FCS          0x00800
  60#define ANALOG_HATS_ALL         0x00e00
  61#define ANALOG_BTN_TL           0x01000
  62#define ANALOG_BTN_TR           0x02000
  63#define ANALOG_BTN_TL2          0x04000
  64#define ANALOG_BTN_TR2          0x08000
  65#define ANALOG_BTNS_TLR         0x03000
  66#define ANALOG_BTNS_TLR2        0x0c000
  67#define ANALOG_BTNS_GAMEPAD     0x0f000
  68
  69#define ANALOG_HBTN_CHF         0x10000
  70#define ANALOG_ANY_CHF          0x10700
  71#define ANALOG_SAITEK           0x20000
  72#define ANALOG_EXTENSIONS       0x7ff00
  73#define ANALOG_GAMEPAD          0x80000
  74
  75#define ANALOG_MAX_TIME         3       /* 3 ms */
  76#define ANALOG_LOOP_TIME        2000    /* 2 * loop */
  77#define ANALOG_SAITEK_DELAY     200     /* 200 us */
  78#define ANALOG_SAITEK_TIME      2000    /* 2000 us */
  79#define ANALOG_AXIS_TIME        2       /* 2 * refresh */
  80#define ANALOG_INIT_RETRIES     8       /* 8 times */
  81#define ANALOG_FUZZ_BITS        2       /* 2 bit more */
  82#define ANALOG_FUZZ_MAGIC       36      /* 36 u*ms/loop */
  83
  84#define ANALOG_MAX_NAME_LENGTH  128
  85#define ANALOG_MAX_PHYS_LENGTH  32
  86
  87static short analog_axes[] = { ABS_X, ABS_Y, ABS_RUDDER, ABS_THROTTLE };
  88static short analog_hats[] = { ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, ABS_HAT2X, ABS_HAT2Y };
  89static short analog_pads[] = { BTN_Y, BTN_Z, BTN_TL, BTN_TR };
  90static short analog_exts[] = { ANALOG_HAT1_CHF, ANALOG_HAT2_CHF, ANALOG_HAT_FCS };
  91static short analog_pad_btn[] = { BTN_A, BTN_B, BTN_C, BTN_X, BTN_TL2, BTN_TR2, BTN_SELECT, BTN_START, BTN_MODE, BTN_BASE };
  92static short analog_joy_btn[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2,
  93                                  BTN_BASE3, BTN_BASE4, BTN_BASE5, BTN_BASE6 };
  94
  95static unsigned char analog_chf[] = { 0xf, 0x0, 0x1, 0x9, 0x2, 0x4, 0xc, 0x8, 0x3, 0x5, 0xb, 0x7, 0xd, 0xe, 0xa, 0x6 };
  96
  97struct analog {
  98        struct input_dev *dev;
  99        int mask;
 100        short *buttons;
 101        char name[ANALOG_MAX_NAME_LENGTH];
 102        char phys[ANALOG_MAX_PHYS_LENGTH];
 103};
 104
 105struct analog_port {
 106        struct gameport *gameport;
 107        struct analog analog[2];
 108        unsigned char mask;
 109        char saitek;
 110        char cooked;
 111        int bads;
 112        int reads;
 113        int speed;
 114        int loop;
 115        int fuzz;
 116        int axes[4];
 117        int buttons;
 118        int initial[4];
 119        int axtime;
 120};
 121
 122/*
 123 * Time macros.
 124 */
 125
 126#ifdef __i386__
 127
 128#include <linux/i8253.h>
 129
 130#define GET_TIME(x)     do { if (boot_cpu_has(X86_FEATURE_TSC)) x = (unsigned int)rdtsc(); else x = get_time_pit(); } while (0)
 131#define DELTA(x,y)      (boot_cpu_has(X86_FEATURE_TSC) ? ((y) - (x)) : ((x) - (y) + ((x) < (y) ? PIT_TICK_RATE / HZ : 0)))
 132#define TIME_NAME       (boot_cpu_has(X86_FEATURE_TSC)?"TSC":"PIT")
 133static unsigned int get_time_pit(void)
 134{
 135        unsigned long flags;
 136        unsigned int count;
 137
 138        raw_spin_lock_irqsave(&i8253_lock, flags);
 139        outb_p(0x00, 0x43);
 140        count = inb_p(0x40);
 141        count |= inb_p(0x40) << 8;
 142        raw_spin_unlock_irqrestore(&i8253_lock, flags);
 143
 144        return count;
 145}
 146#elif defined(__x86_64__)
 147#define GET_TIME(x)     do { x = (unsigned int)rdtsc(); } while (0)
 148#define DELTA(x,y)      ((y)-(x))
 149#define TIME_NAME       "TSC"
 150#elif defined(__alpha__) || defined(CONFIG_ARM) || defined(CONFIG_ARM64) || defined(CONFIG_PPC) || defined(CONFIG_RISCV)
 151#define GET_TIME(x)     do { x = get_cycles(); } while (0)
 152#define DELTA(x,y)      ((y)-(x))
 153#define TIME_NAME       "get_cycles"
 154#else
 155#define FAKE_TIME
 156static unsigned long analog_faketime = 0;
 157#define GET_TIME(x)     do { x = analog_faketime++; } while(0)
 158#define DELTA(x,y)      ((y)-(x))
 159#define TIME_NAME       "Unreliable"
 160#warning Precise timer not defined for this architecture.
 161#endif
 162
 163static inline u64 get_time(void)
 164{
 165        if (use_ktime) {
 166                return ktime_get_ns();
 167        } else {
 168                unsigned int x;
 169                GET_TIME(x);
 170                return x;
 171        }
 172}
 173
 174static inline unsigned int delta(u64 x, u64 y)
 175{
 176        if (use_ktime)
 177                return y - x;
 178        else
 179                return DELTA((unsigned int)x, (unsigned int)y);
 180}
 181
 182/*
 183 * analog_decode() decodes analog joystick data and reports input events.
 184 */
 185
 186static void analog_decode(struct analog *analog, int *axes, int *initial, int buttons)
 187{
 188        struct input_dev *dev = analog->dev;
 189        int i, j;
 190
 191        if (analog->mask & ANALOG_HAT_FCS)
 192                for (i = 0; i < 4; i++)
 193                        if (axes[3] < ((initial[3] * ((i << 1) + 1)) >> 3)) {
 194                                buttons |= 1 << (i + 14);
 195                                break;
 196                        }
 197
 198        for (i = j = 0; i < 6; i++)
 199                if (analog->mask & (0x10 << i))
 200                        input_report_key(dev, analog->buttons[j++], (buttons >> i) & 1);
 201
 202        if (analog->mask & ANALOG_HBTN_CHF)
 203                for (i = 0; i < 4; i++)
 204                        input_report_key(dev, analog->buttons[j++], (buttons >> (i + 10)) & 1);
 205
 206        if (analog->mask & ANALOG_BTN_TL)
 207                input_report_key(dev, analog_pads[0], axes[2] < (initial[2] >> 1));
 208        if (analog->mask & ANALOG_BTN_TR)
 209                input_report_key(dev, analog_pads[1], axes[3] < (initial[3] >> 1));
 210        if (analog->mask & ANALOG_BTN_TL2)
 211                input_report_key(dev, analog_pads[2], axes[2] > (initial[2] + (initial[2] >> 1)));
 212        if (analog->mask & ANALOG_BTN_TR2)
 213                input_report_key(dev, analog_pads[3], axes[3] > (initial[3] + (initial[3] >> 1)));
 214
 215        for (i = j = 0; i < 4; i++)
 216                if (analog->mask & (1 << i))
 217                        input_report_abs(dev, analog_axes[j++], axes[i]);
 218
 219        for (i = j = 0; i < 3; i++)
 220                if (analog->mask & analog_exts[i]) {
 221                        input_report_abs(dev, analog_hats[j++],
 222                                ((buttons >> ((i << 2) + 7)) & 1) - ((buttons >> ((i << 2) + 9)) & 1));
 223                        input_report_abs(dev, analog_hats[j++],
 224                                ((buttons >> ((i << 2) + 8)) & 1) - ((buttons >> ((i << 2) + 6)) & 1));
 225                }
 226
 227        input_sync(dev);
 228}
 229
 230/*
 231 * analog_cooked_read() reads analog joystick data.
 232 */
 233
 234static int analog_cooked_read(struct analog_port *port)
 235{
 236        struct gameport *gameport = port->gameport;
 237        u64 time[4], start, loop, now;
 238        unsigned int loopout, timeout;
 239        unsigned char data[4], this, last;
 240        unsigned long flags;
 241        int i, j;
 242
 243        loopout = (ANALOG_LOOP_TIME * port->loop) / 1000;
 244        timeout = ANALOG_MAX_TIME * port->speed;
 245
 246        local_irq_save(flags);
 247        gameport_trigger(gameport);
 248        now = get_time();
 249        local_irq_restore(flags);
 250
 251        start = now;
 252        this = port->mask;
 253        i = 0;
 254
 255        do {
 256                loop = now;
 257                last = this;
 258
 259                local_irq_disable();
 260                this = gameport_read(gameport) & port->mask;
 261                now = get_time();
 262                local_irq_restore(flags);
 263
 264                if ((last ^ this) && (delta(loop, now) < loopout)) {
 265                        data[i] = last ^ this;
 266                        time[i] = now;
 267                        i++;
 268                }
 269
 270        } while (this && (i < 4) && (delta(start, now) < timeout));
 271
 272        this <<= 4;
 273
 274        for (--i; i >= 0; i--) {
 275                this |= data[i];
 276                for (j = 0; j < 4; j++)
 277                        if (data[i] & (1 << j))
 278                                port->axes[j] = (delta(start, time[i]) << ANALOG_FUZZ_BITS) / port->loop;
 279        }
 280
 281        return -(this != port->mask);
 282}
 283
 284static int analog_button_read(struct analog_port *port, char saitek, char chf)
 285{
 286        unsigned char u;
 287        int t = 1, i = 0;
 288        int strobe = gameport_time(port->gameport, ANALOG_SAITEK_TIME);
 289
 290        u = gameport_read(port->gameport);
 291
 292        if (!chf) {
 293                port->buttons = (~u >> 4) & 0xf;
 294                return 0;
 295        }
 296
 297        port->buttons = 0;
 298
 299        while ((~u & 0xf0) && (i < 16) && t) {
 300                port->buttons |= 1 << analog_chf[(~u >> 4) & 0xf];
 301                if (!saitek) return 0;
 302                udelay(ANALOG_SAITEK_DELAY);
 303                t = strobe;
 304                gameport_trigger(port->gameport);
 305                while (((u = gameport_read(port->gameport)) & port->mask) && t) t--;
 306                i++;
 307        }
 308
 309        return -(!t || (i == 16));
 310}
 311
 312/*
 313 * analog_poll() repeatedly polls the Analog joysticks.
 314 */
 315
 316static void analog_poll(struct gameport *gameport)
 317{
 318        struct analog_port *port = gameport_get_drvdata(gameport);
 319        int i;
 320
 321        char saitek = !!(port->analog[0].mask & ANALOG_SAITEK);
 322        char chf = !!(port->analog[0].mask & ANALOG_ANY_CHF);
 323
 324        if (port->cooked) {
 325                port->bads -= gameport_cooked_read(port->gameport, port->axes, &port->buttons);
 326                if (chf)
 327                        port->buttons = port->buttons ? (1 << analog_chf[port->buttons]) : 0;
 328                port->reads++;
 329        } else {
 330                if (!port->axtime--) {
 331                        port->bads -= analog_cooked_read(port);
 332                        port->bads -= analog_button_read(port, saitek, chf);
 333                        port->reads++;
 334                        port->axtime = ANALOG_AXIS_TIME - 1;
 335                } else {
 336                        if (!saitek)
 337                                analog_button_read(port, saitek, chf);
 338                }
 339        }
 340
 341        for (i = 0; i < 2; i++)
 342                if (port->analog[i].mask)
 343                        analog_decode(port->analog + i, port->axes, port->initial, port->buttons);
 344}
 345
 346/*
 347 * analog_open() is a callback from the input open routine.
 348 */
 349
 350static int analog_open(struct input_dev *dev)
 351{
 352        struct analog_port *port = input_get_drvdata(dev);
 353
 354        gameport_start_polling(port->gameport);
 355        return 0;
 356}
 357
 358/*
 359 * analog_close() is a callback from the input close routine.
 360 */
 361
 362static void analog_close(struct input_dev *dev)
 363{
 364        struct analog_port *port = input_get_drvdata(dev);
 365
 366        gameport_stop_polling(port->gameport);
 367}
 368
 369/*
 370 * analog_calibrate_timer() calibrates the timer and computes loop
 371 * and timeout values for a joystick port.
 372 */
 373
 374static void analog_calibrate_timer(struct analog_port *port)
 375{
 376        struct gameport *gameport = port->gameport;
 377        unsigned int i, t, tx;
 378        u64 t1, t2, t3;
 379        unsigned long flags;
 380
 381        if (use_ktime) {
 382                port->speed = 1000000;
 383        } else {
 384                local_irq_save(flags);
 385                t1 = get_time();
 386#ifdef FAKE_TIME
 387                analog_faketime += 830;
 388#endif
 389                mdelay(1);
 390                t2 = get_time();
 391                t3 = get_time();
 392                local_irq_restore(flags);
 393
 394                port->speed = delta(t1, t2) - delta(t2, t3);
 395        }
 396
 397        tx = ~0;
 398
 399        for (i = 0; i < 50; i++) {
 400                local_irq_save(flags);
 401                t1 = get_time();
 402                for (t = 0; t < 50; t++) {
 403                        gameport_read(gameport);
 404                        t2 = get_time();
 405                }
 406                t3 = get_time();
 407                local_irq_restore(flags);
 408                udelay(i);
 409                t = delta(t1, t2) - delta(t2, t3);
 410                if (t < tx) tx = t;
 411        }
 412
 413        port->loop = tx / 50;
 414}
 415
 416/*
 417 * analog_name() constructs a name for an analog joystick.
 418 */
 419
 420static void analog_name(struct analog *analog)
 421{
 422        snprintf(analog->name, sizeof(analog->name), "Analog %d-axis %d-button",
 423                 hweight8(analog->mask & ANALOG_AXES_STD),
 424                 hweight8(analog->mask & ANALOG_BTNS_STD) + !!(analog->mask & ANALOG_BTNS_CHF) * 2 +
 425                 hweight16(analog->mask & ANALOG_BTNS_GAMEPAD) + !!(analog->mask & ANALOG_HBTN_CHF) * 4);
 426
 427        if (analog->mask & ANALOG_HATS_ALL)
 428                snprintf(analog->name, sizeof(analog->name), "%s %d-hat",
 429                         analog->name, hweight16(analog->mask & ANALOG_HATS_ALL));
 430
 431        if (analog->mask & ANALOG_HAT_FCS)
 432                strlcat(analog->name, " FCS", sizeof(analog->name));
 433        if (analog->mask & ANALOG_ANY_CHF)
 434                strlcat(analog->name, (analog->mask & ANALOG_SAITEK) ? " Saitek" : " CHF",
 435                        sizeof(analog->name));
 436
 437        strlcat(analog->name, (analog->mask & ANALOG_GAMEPAD) ? " gamepad": " joystick",
 438                sizeof(analog->name));
 439}
 440
 441/*
 442 * analog_init_device()
 443 */
 444
 445static int analog_init_device(struct analog_port *port, struct analog *analog, int index)
 446{
 447        struct input_dev *input_dev;
 448        int i, j, t, v, w, x, y, z;
 449        int error;
 450
 451        analog_name(analog);
 452        snprintf(analog->phys, sizeof(analog->phys),
 453                 "%s/input%d", port->gameport->phys, index);
 454        analog->buttons = (analog->mask & ANALOG_GAMEPAD) ? analog_pad_btn : analog_joy_btn;
 455
 456        analog->dev = input_dev = input_allocate_device();
 457        if (!input_dev)
 458                return -ENOMEM;
 459
 460        input_dev->name = analog->name;
 461        input_dev->phys = analog->phys;
 462        input_dev->id.bustype = BUS_GAMEPORT;
 463        input_dev->id.vendor = GAMEPORT_ID_VENDOR_ANALOG;
 464        input_dev->id.product = analog->mask >> 4;
 465        input_dev->id.version = 0x0100;
 466        input_dev->dev.parent = &port->gameport->dev;
 467
 468        input_set_drvdata(input_dev, port);
 469
 470        input_dev->open = analog_open;
 471        input_dev->close = analog_close;
 472
 473        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 474
 475        for (i = j = 0; i < 4; i++)
 476                if (analog->mask & (1 << i)) {
 477
 478                        t = analog_axes[j];
 479                        x = port->axes[i];
 480                        y = (port->axes[0] + port->axes[1]) >> 1;
 481                        z = y - port->axes[i];
 482                        z = z > 0 ? z : -z;
 483                        v = (x >> 3);
 484                        w = (x >> 3);
 485
 486                        if ((i == 2 || i == 3) && (j == 2 || j == 3) && (z > (y >> 3)))
 487                                x = y;
 488
 489                        if (analog->mask & ANALOG_SAITEK) {
 490                                if (i == 2) x = port->axes[i];
 491                                v = x - (x >> 2);
 492                                w = (x >> 4);
 493                        }
 494
 495                        input_set_abs_params(input_dev, t, v, (x << 1) - v, port->fuzz, w);
 496                        j++;
 497                }
 498
 499        for (i = j = 0; i < 3; i++)
 500                if (analog->mask & analog_exts[i])
 501                        for (x = 0; x < 2; x++) {
 502                                t = analog_hats[j++];
 503                                input_set_abs_params(input_dev, t, -1, 1, 0, 0);
 504                        }
 505
 506        for (i = j = 0; i < 4; i++)
 507                if (analog->mask & (0x10 << i))
 508                        set_bit(analog->buttons[j++], input_dev->keybit);
 509
 510        if (analog->mask & ANALOG_BTNS_CHF)
 511                for (i = 0; i < 2; i++)
 512                        set_bit(analog->buttons[j++], input_dev->keybit);
 513
 514        if (analog->mask & ANALOG_HBTN_CHF)
 515                for (i = 0; i < 4; i++)
 516                        set_bit(analog->buttons[j++], input_dev->keybit);
 517
 518        for (i = 0; i < 4; i++)
 519                if (analog->mask & (ANALOG_BTN_TL << i))
 520                        set_bit(analog_pads[i], input_dev->keybit);
 521
 522        analog_decode(analog, port->axes, port->initial, port->buttons);
 523
 524        error = input_register_device(analog->dev);
 525        if (error) {
 526                input_free_device(analog->dev);
 527                return error;
 528        }
 529
 530        return 0;
 531}
 532
 533/*
 534 * analog_init_devices() sets up device-specific values and registers the input devices.
 535 */
 536
 537static int analog_init_masks(struct analog_port *port)
 538{
 539        int i;
 540        struct analog *analog = port->analog;
 541        int max[4];
 542
 543        if (!port->mask)
 544                return -1;
 545
 546        if ((port->mask & 3) != 3 && port->mask != 0xc) {
 547                printk(KERN_WARNING "analog.c: Unknown joystick device found  "
 548                        "(data=%#x, %s), probably not analog joystick.\n",
 549                        port->mask, port->gameport->phys);
 550                return -1;
 551        }
 552
 553
 554        i = analog_options[0]; /* FIXME !!! - need to specify options for different ports */
 555
 556        analog[0].mask = i & 0xfffff;
 557
 558        analog[0].mask &= ~(ANALOG_AXES_STD | ANALOG_HAT_FCS | ANALOG_BTNS_GAMEPAD)
 559                        | port->mask | ((port->mask << 8) & ANALOG_HAT_FCS)
 560                        | ((port->mask << 10) & ANALOG_BTNS_TLR) | ((port->mask << 12) & ANALOG_BTNS_TLR2);
 561
 562        analog[0].mask &= ~(ANALOG_HAT2_CHF)
 563                        | ((analog[0].mask & ANALOG_HBTN_CHF) ? 0 : ANALOG_HAT2_CHF);
 564
 565        analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_BTN_TR | ANALOG_BTN_TR2)
 566                        | ((~analog[0].mask & ANALOG_HAT_FCS) >> 8)
 567                        | ((~analog[0].mask & ANALOG_HAT_FCS) << 2)
 568                        | ((~analog[0].mask & ANALOG_HAT_FCS) << 4);
 569
 570        analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_RUDDER)
 571                        | (((~analog[0].mask & ANALOG_BTNS_TLR ) >> 10)
 572                        &  ((~analog[0].mask & ANALOG_BTNS_TLR2) >> 12));
 573
 574        analog[1].mask = ((i >> 20) & 0xff) | ((i >> 12) & 0xf0000);
 575
 576        analog[1].mask &= (analog[0].mask & ANALOG_EXTENSIONS) ? ANALOG_GAMEPAD
 577                        : (((ANALOG_BTNS_STD | port->mask) & ~analog[0].mask) | ANALOG_GAMEPAD);
 578
 579        if (port->cooked) {
 580
 581                for (i = 0; i < 4; i++) max[i] = port->axes[i] << 1;
 582
 583                if ((analog[0].mask & 0x7) == 0x7) max[2] = (max[0] + max[1]) >> 1;
 584                if ((analog[0].mask & 0xb) == 0xb) max[3] = (max[0] + max[1]) >> 1;
 585                if ((analog[0].mask & ANALOG_BTN_TL) && !(analog[0].mask & ANALOG_BTN_TL2)) max[2] >>= 1;
 586                if ((analog[0].mask & ANALOG_BTN_TR) && !(analog[0].mask & ANALOG_BTN_TR2)) max[3] >>= 1;
 587                if ((analog[0].mask & ANALOG_HAT_FCS)) max[3] >>= 1;
 588
 589                gameport_calibrate(port->gameport, port->axes, max);
 590        }
 591
 592        for (i = 0; i < 4; i++)
 593                port->initial[i] = port->axes[i];
 594
 595        return -!(analog[0].mask || analog[1].mask);
 596}
 597
 598static int analog_init_port(struct gameport *gameport, struct gameport_driver *drv, struct analog_port *port)
 599{
 600        int i, t, u, v;
 601
 602        port->gameport = gameport;
 603
 604        gameport_set_drvdata(gameport, port);
 605
 606        if (!gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {
 607
 608                analog_calibrate_timer(port);
 609
 610                gameport_trigger(gameport);
 611                t = gameport_read(gameport);
 612                msleep(ANALOG_MAX_TIME);
 613                port->mask = (gameport_read(gameport) ^ t) & t & 0xf;
 614                port->fuzz = (port->speed * ANALOG_FUZZ_MAGIC) / port->loop / 1000 + ANALOG_FUZZ_BITS;
 615
 616                for (i = 0; i < ANALOG_INIT_RETRIES; i++) {
 617                        if (!analog_cooked_read(port))
 618                                break;
 619                        msleep(ANALOG_MAX_TIME);
 620                }
 621
 622                u = v = 0;
 623
 624                msleep(ANALOG_MAX_TIME);
 625                t = gameport_time(gameport, ANALOG_MAX_TIME * 1000);
 626                gameport_trigger(gameport);
 627                while ((gameport_read(port->gameport) & port->mask) && (u < t))
 628                        u++;
 629                udelay(ANALOG_SAITEK_DELAY);
 630                t = gameport_time(gameport, ANALOG_SAITEK_TIME);
 631                gameport_trigger(gameport);
 632                while ((gameport_read(port->gameport) & port->mask) && (v < t))
 633                        v++;
 634
 635                if (v < (u >> 1)) { /* FIXME - more than one port */
 636                        analog_options[0] |= /* FIXME - more than one port */
 637                                ANALOG_SAITEK | ANALOG_BTNS_CHF | ANALOG_HBTN_CHF | ANALOG_HAT1_CHF;
 638                        return 0;
 639                }
 640
 641                gameport_close(gameport);
 642        }
 643
 644        if (!gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {
 645
 646                for (i = 0; i < ANALOG_INIT_RETRIES; i++)
 647                        if (!gameport_cooked_read(gameport, port->axes, &port->buttons))
 648                                break;
 649                for (i = 0; i < 4; i++)
 650                        if (port->axes[i] != -1)
 651                                port->mask |= 1 << i;
 652
 653                port->fuzz = gameport->fuzz;
 654                port->cooked = 1;
 655                return 0;
 656        }
 657
 658        return gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
 659}
 660
 661static int analog_connect(struct gameport *gameport, struct gameport_driver *drv)
 662{
 663        struct analog_port *port;
 664        int i;
 665        int err;
 666
 667        if (!(port = kzalloc(sizeof(struct analog_port), GFP_KERNEL)))
 668                return -ENOMEM;
 669
 670        err = analog_init_port(gameport, drv, port);
 671        if (err)
 672                goto fail1;
 673
 674        err = analog_init_masks(port);
 675        if (err)
 676                goto fail2;
 677
 678        gameport_set_poll_handler(gameport, analog_poll);
 679        gameport_set_poll_interval(gameport, 10);
 680
 681        for (i = 0; i < 2; i++)
 682                if (port->analog[i].mask) {
 683                        err = analog_init_device(port, port->analog + i, i);
 684                        if (err)
 685                                goto fail3;
 686                }
 687
 688        return 0;
 689
 690 fail3: while (--i >= 0)
 691                if (port->analog[i].mask)
 692                        input_unregister_device(port->analog[i].dev);
 693 fail2: gameport_close(gameport);
 694 fail1: gameport_set_drvdata(gameport, NULL);
 695        kfree(port);
 696        return err;
 697}
 698
 699static void analog_disconnect(struct gameport *gameport)
 700{
 701        struct analog_port *port = gameport_get_drvdata(gameport);
 702        int i;
 703
 704        for (i = 0; i < 2; i++)
 705                if (port->analog[i].mask)
 706                        input_unregister_device(port->analog[i].dev);
 707        gameport_close(gameport);
 708        gameport_set_drvdata(gameport, NULL);
 709        printk(KERN_INFO "analog.c: %d out of %d reads (%d%%) on %s failed\n",
 710                port->bads, port->reads, port->reads ? (port->bads * 100 / port->reads) : 0,
 711                port->gameport->phys);
 712        kfree(port);
 713}
 714
 715struct analog_types {
 716        char *name;
 717        int value;
 718};
 719
 720static struct analog_types analog_types[] = {
 721        { "none",       0x00000000 },
 722        { "auto",       0x000000ff },
 723        { "2btn",       0x0000003f },
 724        { "y-joy",      0x0cc00033 },
 725        { "y-pad",      0x8cc80033 },
 726        { "fcs",        0x000008f7 },
 727        { "chf",        0x000002ff },
 728        { "fullchf",    0x000007ff },
 729        { "gamepad",    0x000830f3 },
 730        { "gamepad8",   0x0008f0f3 },
 731        { NULL, 0 }
 732};
 733
 734static void analog_parse_options(void)
 735{
 736        int i, j;
 737        char *end;
 738
 739        for (i = 0; i < js_nargs; i++) {
 740
 741                for (j = 0; analog_types[j].name; j++)
 742                        if (!strcmp(analog_types[j].name, js[i])) {
 743                                analog_options[i] = analog_types[j].value;
 744                                break;
 745                        }
 746                if (analog_types[j].name) continue;
 747
 748                analog_options[i] = simple_strtoul(js[i], &end, 0);
 749                if (end != js[i]) continue;
 750
 751                analog_options[i] = 0xff;
 752                if (!strlen(js[i])) continue;
 753
 754                printk(KERN_WARNING "analog.c: Bad config for port %d - \"%s\"\n", i, js[i]);
 755        }
 756
 757        for (; i < ANALOG_PORTS; i++)
 758                analog_options[i] = 0xff;
 759}
 760
 761/*
 762 * The gameport device structure.
 763 */
 764
 765static struct gameport_driver analog_drv = {
 766        .driver         = {
 767                .name   = "analog",
 768        },
 769        .description    = DRIVER_DESC,
 770        .connect        = analog_connect,
 771        .disconnect     = analog_disconnect,
 772};
 773
 774static int __init analog_init(void)
 775{
 776        analog_parse_options();
 777        return gameport_register_driver(&analog_drv);
 778}
 779
 780static void __exit analog_exit(void)
 781{
 782        gameport_unregister_driver(&analog_drv);
 783}
 784
 785module_init(analog_init);
 786module_exit(analog_exit);
 787