analog.c

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/*
 *  Copyright (c) 1996-2001 Vojtech Pavlik
 */

/*
 * Analog joystick and gamepad driver for Linux
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <[email protected]>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/gameport.h>
#include <linux/jiffies.h>
#include <linux/timex.h>

#define DRIVER_DESC "Analog joystick and gamepad driver"

MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/*
 * Option parsing.
 */

#define ANALOG_PORTS        16

static char *js[ANALOG_PORTS];
static unsigned int js_nargs;
static int analog_options[ANALOG_PORTS];
module_param_array_named(map, js, charp, &js_nargs, 0);
MODULE_PARM_DESC(map, "Describes analog joysticks type/capabilities");

/*
 * Times, feature definitions.
 */

#define ANALOG_RUDDER       0x00004
#define ANALOG_THROTTLE     0x00008
#define ANALOG_AXES_STD     0x0000f
#define ANALOG_BTNS_STD     0x000f0

#define ANALOG_BTNS_CHF     0x00100
#define ANALOG_HAT1_CHF     0x00200
#define ANALOG_HAT2_CHF     0x00400
#define ANALOG_HAT_FCS      0x00800
#define ANALOG_HATS_ALL     0x00e00
#define ANALOG_BTN_TL       0x01000
#define ANALOG_BTN_TR       0x02000
#define ANALOG_BTN_TL2      0x04000
#define ANALOG_BTN_TR2      0x08000
#define ANALOG_BTNS_TLR     0x03000
#define ANALOG_BTNS_TLR2    0x0c000
#define ANALOG_BTNS_GAMEPAD 0x0f000

#define ANALOG_HBTN_CHF     0x10000
#define ANALOG_ANY_CHF      0x10700
#define ANALOG_SAITEK       0x20000
#define ANALOG_EXTENSIONS   0x7ff00
#define ANALOG_GAMEPAD      0x80000

#define ANALOG_MAX_TIME     3   /* 3 ms */
#define ANALOG_LOOP_TIME    2000    /* 2 * loop */
#define ANALOG_SAITEK_DELAY 200 /* 200 us */
#define ANALOG_SAITEK_TIME  2000    /* 2000 us */
#define ANALOG_AXIS_TIME    2   /* 2 * refresh */
#define ANALOG_INIT_RETRIES 8   /* 8 times */
#define ANALOG_FUZZ_BITS    2   /* 2 bit more */
#define ANALOG_FUZZ_MAGIC   36  /* 36 u*ms/loop */

#define ANALOG_MAX_NAME_LENGTH  128
#define ANALOG_MAX_PHYS_LENGTH  32

static short analog_axes[] = { ABS_X, ABS_Y, ABS_RUDDER, ABS_THROTTLE };
static short analog_hats[] = { ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, ABS_HAT2X, ABS_HAT2Y };
static short analog_pads[] = { BTN_Y, BTN_Z, BTN_TL, BTN_TR };
static short analog_exts[] = { ANALOG_HAT1_CHF, ANALOG_HAT2_CHF, ANALOG_HAT_FCS };
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 };
static short analog_joy_btn[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2,
                  BTN_BASE3, BTN_BASE4, BTN_BASE5, BTN_BASE6 };

static unsigned char analog_chf[] = { 0xf, 0x0, 0x1, 0x9, 0x2, 0x4, 0xc, 0x8, 0x3, 0x5, 0xb, 0x7, 0xd, 0xe, 0xa, 0x6 };

struct analog {
    struct input_dev *dev;
    int mask;
    short *buttons;
    char name[ANALOG_MAX_NAME_LENGTH];
    char phys[ANALOG_MAX_PHYS_LENGTH];
};

struct analog_port {
    struct gameport *gameport;
    struct analog analog[2];
    unsigned char mask;
    char saitek;
    char cooked;
    int bads;
    int reads;
    int speed;
    int loop;
    int fuzz;
    int axes[4];
    int buttons;
    int initial[4];
    int axtime;
};

/*
 * Time macros.
 */

#ifdef __i386__

#include <linux/i8253.h>

#define GET_TIME(x) do { if (cpu_has_tsc) rdtscl(x); else x = get_time_pit(); } while (0)
#define DELTA(x,y)  (cpu_has_tsc ? ((y) - (x)) : ((x) - (y) + ((x) < (y) ? PIT_TICK_RATE / HZ : 0)))
#define TIME_NAME   (cpu_has_tsc?"TSC":"PIT")
static unsigned int get_time_pit(void)
{
        unsigned long flags;
        unsigned int count;

        raw_spin_lock_irqsave(&i8253_lock, flags);
        outb_p(0x00, 0x43);
        count = inb_p(0x40);
        count |= inb_p(0x40) << 8;
        raw_spin_unlock_irqrestore(&i8253_lock, flags);

        return count;
}
#elif defined(__x86_64__)
#define GET_TIME(x) rdtscl(x)
#define DELTA(x,y)  ((y)-(x))
#define TIME_NAME   "TSC"
#elif defined(__alpha__)
#define GET_TIME(x) do { x = get_cycles(); } while (0)
#define DELTA(x,y)  ((y)-(x))
#define TIME_NAME   "PCC"
#elif defined(CONFIG_MN10300)
#define GET_TIME(x) do { x = get_cycles(); } while (0)
#define DELTA(x, y) ((x) - (y))
#define TIME_NAME   "TSC"
#else
#define FAKE_TIME
static unsigned long analog_faketime = 0;
#define GET_TIME(x)     do { x = analog_faketime++; } while(0)
#define DELTA(x,y)  ((y)-(x))
#define TIME_NAME   "Unreliable"
#warning Precise timer not defined for this architecture.
#endif

/*
 * analog_decode() decodes analog joystick data and reports input events.
 */

static void analog_decode(struct analog *analog, int *axes, int *initial, int buttons)
{
    struct input_dev *dev = analog->dev;
    int i, j;

    if (analog->mask & ANALOG_HAT_FCS)
        for (i = 0; i < 4; i++)
            if (axes[3] < ((initial[3] * ((i << 1) + 1)) >> 3)) {
                buttons |= 1 << (i + 14);
                break;
            }

    for (i = j = 0; i < 6; i++)
        if (analog->mask & (0x10 << i))
            input_report_key(dev, analog->buttons[j++], (buttons >> i) & 1);

    if (analog->mask & ANALOG_HBTN_CHF)
        for (i = 0; i < 4; i++)
            input_report_key(dev, analog->buttons[j++], (buttons >> (i + 10)) & 1);

    if (analog->mask & ANALOG_BTN_TL)
        input_report_key(dev, analog_pads[0], axes[2] < (initial[2] >> 1));
    if (analog->mask & ANALOG_BTN_TR)
        input_report_key(dev, analog_pads[1], axes[3] < (initial[3] >> 1));
    if (analog->mask & ANALOG_BTN_TL2)
        input_report_key(dev, analog_pads[2], axes[2] > (initial[2] + (initial[2] >> 1)));
    if (analog->mask & ANALOG_BTN_TR2)
        input_report_key(dev, analog_pads[3], axes[3] > (initial[3] + (initial[3] >> 1)));

    for (i = j = 0; i < 4; i++)
        if (analog->mask & (1 << i))
            input_report_abs(dev, analog_axes[j++], axes[i]);

    for (i = j = 0; i < 3; i++)
        if (analog->mask & analog_exts[i]) {
            input_report_abs(dev, analog_hats[j++],
                ((buttons >> ((i << 2) + 7)) & 1) - ((buttons >> ((i << 2) + 9)) & 1));
            input_report_abs(dev, analog_hats[j++],
                ((buttons >> ((i << 2) + 8)) & 1) - ((buttons >> ((i << 2) + 6)) & 1));
        }

    input_sync(dev);
}

/*
 * analog_cooked_read() reads analog joystick data.
 */

static int analog_cooked_read(struct analog_port *port)
{
    struct gameport *gameport = port->gameport;
    unsigned int time[4], start, loop, now, loopout, timeout;
    unsigned char data[4], this, last;
    unsigned long flags;
    int i, j;

    loopout = (ANALOG_LOOP_TIME * port->loop) / 1000;
    timeout = ANALOG_MAX_TIME * port->speed;

    local_irq_save(flags);
    gameport_trigger(gameport);
    GET_TIME(now);
    local_irq_restore(flags);

    start = now;
    this = port->mask;
    i = 0;

    do {
        loop = now;
        last = this;

        local_irq_disable();
        this = gameport_read(gameport) & port->mask;
        GET_TIME(now);
        local_irq_restore(flags);

        if ((last ^ this) && (DELTA(loop, now) < loopout)) {
            data[i] = last ^ this;
            time[i] = now;
            i++;
        }

    } while (this && (i < 4) && (DELTA(start, now) < timeout));

    this <<= 4;

    for (--i; i >= 0; i--) {
        this |= data[i];
        for (j = 0; j < 4; j++)
            if (data[i] & (1 << j))
                port->axes[j] = (DELTA(start, time[i]) << ANALOG_FUZZ_BITS) / port->loop;
    }

    return -(this != port->mask);
}

static int analog_button_read(struct analog_port *port, char saitek, char chf)
{
    unsigned char u;
    int t = 1, i = 0;
    int strobe = gameport_time(port->gameport, ANALOG_SAITEK_TIME);

    u = gameport_read(port->gameport);

    if (!chf) {
        port->buttons = (~u >> 4) & 0xf;
        return 0;
    }

    port->buttons = 0;

    while ((~u & 0xf0) && (i < 16) && t) {
        port->buttons |= 1 << analog_chf[(~u >> 4) & 0xf];
        if (!saitek) return 0;
        udelay(ANALOG_SAITEK_DELAY);
        t = strobe;
        gameport_trigger(port->gameport);
        while (((u = gameport_read(port->gameport)) & port->mask) && t) t--;
        i++;
    }

    return -(!t || (i == 16));
}

/*
 * analog_poll() repeatedly polls the Analog joysticks.
 */

static void analog_poll(struct gameport *gameport)
{
    struct analog_port *port = gameport_get_drvdata(gameport);
    int i;

    char saitek = !!(port->analog[0].mask & ANALOG_SAITEK);
    char chf = !!(port->analog[0].mask & ANALOG_ANY_CHF);

    if (port->cooked) {
        port->bads -= gameport_cooked_read(port->gameport, port->axes, &port->buttons);
        if (chf)
            port->buttons = port->buttons ? (1 << analog_chf[port->buttons]) : 0;
        port->reads++;
    } else {
        if (!port->axtime--) {
            port->bads -= analog_cooked_read(port);
            port->bads -= analog_button_read(port, saitek, chf);
            port->reads++;
            port->axtime = ANALOG_AXIS_TIME - 1;
        } else {
            if (!saitek)
                analog_button_read(port, saitek, chf);
        }
    }

    for (i = 0; i < 2; i++)
        if (port->analog[i].mask)
            analog_decode(port->analog + i, port->axes, port->initial, port->buttons);
}

/*
 * analog_open() is a callback from the input open routine.
 */

static int analog_open(struct input_dev *dev)
{
    struct analog_port *port = input_get_drvdata(dev);

    gameport_start_polling(port->gameport);
    return 0;
}

/*
 * analog_close() is a callback from the input close routine.
 */

static void analog_close(struct input_dev *dev)
{
    struct analog_port *port = input_get_drvdata(dev);

    gameport_stop_polling(port->gameport);
}

/*
 * analog_calibrate_timer() calibrates the timer and computes loop
 * and timeout values for a joystick port.
 */

static void analog_calibrate_timer(struct analog_port *port)
{
    struct gameport *gameport = port->gameport;
    unsigned int i, t, tx, t1, t2, t3;
    unsigned long flags;

    local_irq_save(flags);
    GET_TIME(t1);
#ifdef FAKE_TIME
    analog_faketime += 830;
#endif
    mdelay(1);
    GET_TIME(t2);
    GET_TIME(t3);
    local_irq_restore(flags);

    port->speed = DELTA(t1, t2) - DELTA(t2, t3);

    tx = ~0;

    for (i = 0; i < 50; i++) {
        local_irq_save(flags);
        GET_TIME(t1);
        for (t = 0; t < 50; t++) { gameport_read(gameport); GET_TIME(t2); }
        GET_TIME(t3);
        local_irq_restore(flags);
        udelay(i);
        t = DELTA(t1, t2) - DELTA(t2, t3);
        if (t < tx) tx = t;
    }

        port->loop = tx / 50;
}

/*
 * analog_name() constructs a name for an analog joystick.
 */

static void analog_name(struct analog *analog)
{
    snprintf(analog->name, sizeof(analog->name), "Analog %d-axis %d-button",
         hweight8(analog->mask & ANALOG_AXES_STD),
         hweight8(analog->mask & ANALOG_BTNS_STD) + !!(analog->mask & ANALOG_BTNS_CHF) * 2 +
         hweight16(analog->mask & ANALOG_BTNS_GAMEPAD) + !!(analog->mask & ANALOG_HBTN_CHF) * 4);

    if (analog->mask & ANALOG_HATS_ALL)
        snprintf(analog->name, sizeof(analog->name), "%s %d-hat",
             analog->name, hweight16(analog->mask & ANALOG_HATS_ALL));

    if (analog->mask & ANALOG_HAT_FCS)
        strlcat(analog->name, " FCS", sizeof(analog->name));
    if (analog->mask & ANALOG_ANY_CHF)
        strlcat(analog->name, (analog->mask & ANALOG_SAITEK) ? " Saitek" : " CHF",
            sizeof(analog->name));

    strlcat(analog->name, (analog->mask & ANALOG_GAMEPAD) ? " gamepad": " joystick",
        sizeof(analog->name));
}

/*
 * analog_init_device()
 */

static int analog_init_device(struct analog_port *port, struct analog *analog, int index)
{
    struct input_dev *input_dev;
    int i, j, t, v, w, x, y, z;
    int error;

    analog_name(analog);
    snprintf(analog->phys, sizeof(analog->phys),
         "%s/input%d", port->gameport->phys, index);
    analog->buttons = (analog->mask & ANALOG_GAMEPAD) ? analog_pad_btn : analog_joy_btn;

    analog->dev = input_dev = input_allocate_device();
    if (!input_dev)
        return -ENOMEM;

    input_dev->name = analog->name;
    input_dev->phys = analog->phys;
    input_dev->id.bustype = BUS_GAMEPORT;
    input_dev->id.vendor = GAMEPORT_ID_VENDOR_ANALOG;
    input_dev->id.product = analog->mask >> 4;
    input_dev->id.version = 0x0100;
    input_dev->dev.parent = &port->gameport->dev;

    input_set_drvdata(input_dev, port);

    input_dev->open = analog_open;
    input_dev->close = analog_close;

    input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

    for (i = j = 0; i < 4; i++)
        if (analog->mask & (1 << i)) {

            t = analog_axes[j];
            x = port->axes[i];
            y = (port->axes[0] + port->axes[1]) >> 1;
            z = y - port->axes[i];
            z = z > 0 ? z : -z;
            v = (x >> 3);
            w = (x >> 3);

            if ((i == 2 || i == 3) && (j == 2 || j == 3) && (z > (y >> 3)))
                x = y;

            if (analog->mask & ANALOG_SAITEK) {
                if (i == 2) x = port->axes[i];
                v = x - (x >> 2);
                w = (x >> 4);
            }

            input_set_abs_params(input_dev, t, v, (x << 1) - v, port->fuzz, w);
            j++;
        }

    for (i = j = 0; i < 3; i++)
        if (analog->mask & analog_exts[i])
            for (x = 0; x < 2; x++) {
                t = analog_hats[j++];
                input_set_abs_params(input_dev, t, -1, 1, 0, 0);
            }

    for (i = j = 0; i < 4; i++)
        if (analog->mask & (0x10 << i))
            set_bit(analog->buttons[j++], input_dev->keybit);

    if (analog->mask & ANALOG_BTNS_CHF)
        for (i = 0; i < 2; i++)
            set_bit(analog->buttons[j++], input_dev->keybit);

    if (analog->mask & ANALOG_HBTN_CHF)
        for (i = 0; i < 4; i++)
            set_bit(analog->buttons[j++], input_dev->keybit);

    for (i = 0; i < 4; i++)
        if (analog->mask & (ANALOG_BTN_TL << i))
            set_bit(analog_pads[i], input_dev->keybit);

    analog_decode(analog, port->axes, port->initial, port->buttons);

    error = input_register_device(analog->dev);
    if (error) {
        input_free_device(analog->dev);
        return error;
    }

    return 0;
}

/*
 * analog_init_devices() sets up device-specific values and registers the input devices.
 */

static int analog_init_masks(struct analog_port *port)
{
    int i;
    struct analog *analog = port->analog;
    int max[4];

    if (!port->mask)
        return -1;

    if ((port->mask & 3) != 3 && port->mask != 0xc) {
        printk(KERN_WARNING "analog.c: Unknown joystick device found  "
            "(data=%#x, %s), probably not analog joystick.\n",
            port->mask, port->gameport->phys);
        return -1;
    }


    i = analog_options[0]; /* FIXME !!! - need to specify options for different ports */

    analog[0].mask = i & 0xfffff;

    analog[0].mask &= ~(ANALOG_AXES_STD | ANALOG_HAT_FCS | ANALOG_BTNS_GAMEPAD)
            | port->mask | ((port->mask << 8) & ANALOG_HAT_FCS)
            | ((port->mask << 10) & ANALOG_BTNS_TLR) | ((port->mask << 12) & ANALOG_BTNS_TLR2);

    analog[0].mask &= ~(ANALOG_HAT2_CHF)
            | ((analog[0].mask & ANALOG_HBTN_CHF) ? 0 : ANALOG_HAT2_CHF);

    analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_BTN_TR | ANALOG_BTN_TR2)
            | ((~analog[0].mask & ANALOG_HAT_FCS) >> 8)
            | ((~analog[0].mask & ANALOG_HAT_FCS) << 2)
            | ((~analog[0].mask & ANALOG_HAT_FCS) << 4);

    analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_RUDDER)
            | (((~analog[0].mask & ANALOG_BTNS_TLR ) >> 10)
            &  ((~analog[0].mask & ANALOG_BTNS_TLR2) >> 12));

    analog[1].mask = ((i >> 20) & 0xff) | ((i >> 12) & 0xf0000);

    analog[1].mask &= (analog[0].mask & ANALOG_EXTENSIONS) ? ANALOG_GAMEPAD
            : (((ANALOG_BTNS_STD | port->mask) & ~analog[0].mask) | ANALOG_GAMEPAD);

    if (port->cooked) {

        for (i = 0; i < 4; i++) max[i] = port->axes[i] << 1;

        if ((analog[0].mask & 0x7) == 0x7) max[2] = (max[0] + max[1]) >> 1;
        if ((analog[0].mask & 0xb) == 0xb) max[3] = (max[0] + max[1]) >> 1;
        if ((analog[0].mask & ANALOG_BTN_TL) && !(analog[0].mask & ANALOG_BTN_TL2)) max[2] >>= 1;
        if ((analog[0].mask & ANALOG_BTN_TR) && !(analog[0].mask & ANALOG_BTN_TR2)) max[3] >>= 1;
        if ((analog[0].mask & ANALOG_HAT_FCS)) max[3] >>= 1;

        gameport_calibrate(port->gameport, port->axes, max);
    }

    for (i = 0; i < 4; i++)
        port->initial[i] = port->axes[i];

    return -!(analog[0].mask || analog[1].mask);
}

static int analog_init_port(struct gameport *gameport, struct gameport_driver *drv, struct analog_port *port)
{
    int i, t, u, v;

    port->gameport = gameport;

    gameport_set_drvdata(gameport, port);

    if (!gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {

        analog_calibrate_timer(port);

        gameport_trigger(gameport);
        t = gameport_read(gameport);
        msleep(ANALOG_MAX_TIME);
        port->mask = (gameport_read(gameport) ^ t) & t & 0xf;
        port->fuzz = (port->speed * ANALOG_FUZZ_MAGIC) / port->loop / 1000 + ANALOG_FUZZ_BITS;

        for (i = 0; i < ANALOG_INIT_RETRIES; i++) {
            if (!analog_cooked_read(port))
                break;
            msleep(ANALOG_MAX_TIME);
        }

        u = v = 0;

        msleep(ANALOG_MAX_TIME);
        t = gameport_time(gameport, ANALOG_MAX_TIME * 1000);
        gameport_trigger(gameport);
        while ((gameport_read(port->gameport) & port->mask) && (u < t))
            u++;
        udelay(ANALOG_SAITEK_DELAY);
        t = gameport_time(gameport, ANALOG_SAITEK_TIME);
        gameport_trigger(gameport);
        while ((gameport_read(port->gameport) & port->mask) && (v < t))
            v++;

        if (v < (u >> 1)) { /* FIXME - more than one port */
            analog_options[0] |= /* FIXME - more than one port */
                ANALOG_SAITEK | ANALOG_BTNS_CHF | ANALOG_HBTN_CHF | ANALOG_HAT1_CHF;
            return 0;
        }

        gameport_close(gameport);
    }

    if (!gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {

        for (i = 0; i < ANALOG_INIT_RETRIES; i++)
            if (!gameport_cooked_read(gameport, port->axes, &port->buttons))
                break;
        for (i = 0; i < 4; i++)
            if (port->axes[i] != -1)
                port->mask |= 1 << i;

        port->fuzz = gameport->fuzz;
        port->cooked = 1;
        return 0;
    }

    return gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
}

static int analog_connect(struct gameport *gameport, struct gameport_driver *drv)
{
    struct analog_port *port;
    int i;
    int err;

    if (!(port = kzalloc(sizeof(struct analog_port), GFP_KERNEL)))
        return - ENOMEM;

    err = analog_init_port(gameport, drv, port);
    if (err)
        goto fail1;

    err = analog_init_masks(port);
    if (err)
        goto fail2;

    gameport_set_poll_handler(gameport, analog_poll);
    gameport_set_poll_interval(gameport, 10);

    for (i = 0; i < 2; i++)
        if (port->analog[i].mask) {
            err = analog_init_device(port, port->analog + i, i);
            if (err)
                goto fail3;
        }

    return 0;

 fail3: while (--i >= 0)
        if (port->analog[i].mask)
            input_unregister_device(port->analog[i].dev);
 fail2: gameport_close(gameport);
 fail1: gameport_set_drvdata(gameport, NULL);
    kfree(port);
    return err;
}

static void analog_disconnect(struct gameport *gameport)
{
    struct analog_port *port = gameport_get_drvdata(gameport);
    int i;

    for (i = 0; i < 2; i++)
        if (port->analog[i].mask)
            input_unregister_device(port->analog[i].dev);
    gameport_close(gameport);
    gameport_set_drvdata(gameport, NULL);
    printk(KERN_INFO "analog.c: %d out of %d reads (%d%%) on %s failed\n",
        port->bads, port->reads, port->reads ? (port->bads * 100 / port->reads) : 0,
        port->gameport->phys);
    kfree(port);
}

struct analog_types {
    char *name;
    int value;
};

static struct analog_types analog_types[] = {
    { "none",   0x00000000 },
    { "auto",   0x000000ff },
    { "2btn",   0x0000003f },
    { "y-joy",  0x0cc00033 },
    { "y-pad",  0x8cc80033 },
    { "fcs",    0x000008f7 },
    { "chf",    0x000002ff },
    { "fullchf",    0x000007ff },
    { "gamepad",    0x000830f3 },
    { "gamepad8",   0x0008f0f3 },
    { NULL, 0 }
};

static void analog_parse_options(void)
{
    int i, j;
    char *end;

    for (i = 0; i < js_nargs; i++) {

        for (j = 0; analog_types[j].name; j++)
            if (!strcmp(analog_types[j].name, js[i])) {
                analog_options[i] = analog_types[j].value;
                break;
            }
        if (analog_types[j].name) continue;

        analog_options[i] = simple_strtoul(js[i], &end, 0);
        if (end != js[i]) continue;

        analog_options[i] = 0xff;
        if (!strlen(js[i])) continue;

        printk(KERN_WARNING "analog.c: Bad config for port %d - \"%s\"\n", i, js[i]);
    }

    for (; i < ANALOG_PORTS; i++)
        analog_options[i] = 0xff;
}

/*
 * The gameport device structure.
 */

static struct gameport_driver analog_drv = {
    .driver     = {
        .name   = "analog",
    },
    .description    = DRIVER_DESC,
    .connect    = analog_connect,
    .disconnect = analog_disconnect,
};

static int __init analog_init(void)
{
    analog_parse_options();
    return gameport_register_driver(&analog_drv);
}

static void __exit analog_exit(void)
{
    gameport_unregister_driver(&analog_drv);
}

module_init(analog_init);
module_exit(analog_exit);