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analog.c

/*
 * $Id: analog.c,v 1.68 2002/01/22 20:18:32 vojtech Exp $
 *
 *  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 <vojtech@ucw.cz>, 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/moduleparam.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 <asm/timex.h>

#define DRIVER_DESC     "Analog joystick and gamepad driver"

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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 <asm/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) ? CLOCK_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;

        spin_lock_irqsave(&i8253_lock, flags);
        outb_p(0x00, 0x43);
        count = inb_p(0x40);
        count |= inb_p(0x40) << 8;
        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"
#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();
      gameport_register_driver(&analog_drv);

      return 0;
}

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

module_init(analog_init);
module_exit(analog_exit);

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